File sh-3.2.4.obscpio of Package shfmt

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File sh-3.2.4.obscpio of Package shfmt (Revision caebc2cdca2b91a8e45cd24455322f24)

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07070100000000000081A4000003E800000064000000016046124D000000C0000000000000000000000000000000000000001800000000sh-3.2.4/.gitattributes# To prevent CRLF breakages on Windows for fragile files, like testdata.
* -text

# Temporary workaround for https://github.com/github/linguist/issues/5072.
*.*.scd linguist-language=Markdown
07070100000001000041ED000003E800000064000000036046124D00000000000000000000000000000000000000000000001100000000sh-3.2.4/.github07070100000002000081A4000003E800000064000000016046124D0000000E000000000000000000000000000000000000001D00000000sh-3.2.4/.github/FUNDING.ymlgithub: mvdan
07070100000003000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001B00000000sh-3.2.4/.github/workflows07070100000004000081A4000003E800000064000000016046124D00001A45000000000000000000000000000000000000002400000000sh-3.2.4/.github/workflows/test.ymlon: [push, pull_request]

name: Go
jobs:

test:
    strategy:
      matrix:
        go-version: [1.14.x, 1.15.x]
        platform: [ubuntu-latest, macos-latest, windows-latest]
    runs-on: ${{ matrix.platform }}
    steps:
    - name: Install Go
      uses: actions/setup-go@v1
      with:
        go-version: ${{ matrix.go-version }}
    - name: Checkout code
      uses: actions/checkout@v2
    - name: Test
      run: go test -count=1 ./...
    - name: Test with -short -race
      run: go test -short -race -count=1 ./...

- name: Test with GOARCH=386
      run: GOARCH=386 go test -count=1 ./...
      if: matrix.platform == 'ubuntu-latest'
    - name: gofmt check
      run: diff <(echo -n) <(gofmt -d .)
      if: matrix.platform == 'ubuntu-latest'

test-linux-alpine:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout code
      uses: actions/checkout@v2
    - name: Test as root, without cgo, and with busybox
      run: docker run -v="$PWD:/pwd" -w=/pwd -e=CGO_ENABLED=0 golang:1.15-alpine go test ./...

docker:
    name: Build and deploy Docker images
    # Only deploy if previous stages pass.
    needs: [test, test-linux-alpine]
    runs-on: ubuntu-latest
    if: >
      github.event_name == 'push' &&
        (github.ref == 'refs/heads/master' ||
         startsWith(github.ref, 'refs/tags/')) &&
      github.repository == 'mvdan/sh'
    env:
      # Export environment variables for all stages.
      DOCKER_CLI_EXPERIMENTAL: enabled # for 'docker buildx'
      DOCKER_USER: mvdan
      DOCKER_PASSWORD: ${{secrets.DOCKER_PASSWORD}}
      DOCKER_REPO: shfmt
      # We use all platforms for which FROM images in our Dockerfile are
      # available.
      DOCKER_PLATFORMS: >
        linux/386
        linux/amd64
        linux/arm/v7
        linux/arm64/v8
        linux/ppc64le

# linux/s390x TODO: reenable when we figure out its weird errors when
      # fetching dependencies, including:
      #
      # zip: checksum error
      # Get "https://proxy.golang.org/...": local error: tls: bad record MAC
      # Get "https://proxy.golang.org/...": local error: tls: unexpected message
      # Get "https://proxy.golang.org/...": x509: certificate signed by unknown authority
    steps:
    - name: Checkout code
      uses: actions/checkout@v2
      with:
        fetch-depth: 0 # also fetch tags for 'git describe'
    - name: Set up image tag
      run: |
        set -vx
        # Export environment variable for later stages.
        if echo "$GITHUB_REF" | grep -q '^refs/heads/'; then
          # Pushes to (master) branch - deploy 'latest'.
          echo "TAG=latest" >> $GITHUB_ENV
        elif echo "$GITHUB_REF" | grep -q '^refs/tags/'; then
          # Pushes tag - deploy tag name.
          echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
        fi
        echo "DOCKER_BASE=${DOCKER_USER}/${DOCKER_REPO}" >> $GITHUB_ENV
    - name: Install Docker buildx
      run: |
        set -vx
        # Install up-to-date version of docker, with buildx support.
        docker_apt_repo='https://download.docker.com/linux/ubuntu'
        curl -fsSL "${docker_apt_repo}/gpg" | sudo apt-key add -
        os="$(lsb_release -cs)"
        sudo add-apt-repository "deb [arch=amd64] $docker_apt_repo $os stable"
        sudo apt-get update
        sudo apt-get -y -o Dpkg::Options::="--force-confnew" install docker-ce

# Enable docker daemon experimental support (for 'pull --platform').
        config='/etc/docker/daemon.json'
        if [[ -e "$config" ]]; then
          sudo sed -i -e 's/{/{ "experimental": true, /' "$config"
        else
          echo '{ "experimental": true }' | sudo tee "$config"
        fi
        sudo systemctl restart docker

# Install QEMU multi-architecture support for docker buildx.
        docker run --rm --privileged multiarch/qemu-user-static --reset -p yes

# Instantiate docker buildx builder with multi-architecture support.
        docker buildx create --name mybuilder
        docker buildx use mybuilder
        # Start up buildx and verify that all is OK.
        docker buildx inspect --bootstrap
    - name: Build multi-architecture Docker images with buildx
      run: |
        set -vx
        echo "$DOCKER_PASSWORD" \
        | docker login -u="$DOCKER_USER" --password-stdin

function buildx() {
          docker buildx build \
            --platform ${DOCKER_PLATFORMS// /,} \
            --push \
            -f cmd/shfmt/Dockerfile \
            "$@" \
            .
        }

buildx -t "$DOCKER_BASE:$TAG"
        buildx -t "$DOCKER_BASE:$TAG-alpine" --target alpine
    - name: Test multi-architecture Docker images
      run: |
        printf '%s\n' "#!/bin/sh" "echo 'hello world'" >myscript

for platform in $DOCKER_PLATFORMS; do
          for ext in '' '-alpine'; do
            image="${DOCKER_BASE}:${TAG}${ext}"
            msg="Testing docker image $image on platform $platform"
            line="${msg//?/=}"
            printf "\n${line}\n${msg}\n${line}\n"
            docker pull -q --platform "$platform" "$image"
            if [ -n "$ext" ]; then
              echo -n "Image architecture: "
              docker run --rm --entrypoint /bin/sh "$image" -c 'uname -m'
            fi
            version=$(docker run --rm "$image" --version)
            echo "shfmt version: $version"
            if [ "$TAG" != 'latest' -a "$TAG" != "$version" ]; then
              echo "Version mismatch: shfmt $version tagged as $TAG"
              exit 1
            fi
            docker run --rm -v "$PWD:/mnt" -w '/mnt' "$image" -d myscript
          done
        done
    - name: Install Node.js
      uses: actions/setup-node@v1
      with:
        node-version: 13.x
    - name: Update DockerHub description
      run: |
        set -vx
        npm install docker-hub-api@0.8.0
        node -e '
          function error(reason) {
            console.log("Error: " + reason.message);
            process.exit(1);
          }
          const fs = require("fs");
          let readme = fs.readFileSync("README.md", "utf8");
          let dockerHubAPI = require("docker-hub-api");
          dockerHubAPI.login(
            process.env.DOCKER_USER,
            process.env.DOCKER_PASSWORD)
          .then(function () {
            let url = "https://github.com/" + process.env.GITHUB_REPOSITORY;
            let repo = process.env.DOCKER_REPO;
            dockerHubAPI.setRepositoryDescription(
              process.env.DOCKER_USER,
              repo,
              {short: "Official " + repo + " images from " + url,
               full: readme})
            .catch(reason => error(reason));
          })
          .catch(reason => error(reason));
        '
07070100000005000081A4000003E800000064000000016046124D00005502000000000000000000000000000000000000001600000000sh-3.2.4/CHANGELOG.md# Changelog

## [3.2.4] - 2021-03-08

- **cmd/shfmt**
  - Don't stop handling arguments when one results in a failure
- **expand**
  - Don't panic when a backslash is followed by EOF

## [3.2.2] - 2021-01-29

- **syntax**
  - Avoid comment position panic in the printer

## [3.2.1] - 2020-12-02

- **syntax**
  - Fix an endless loop when parsing single quotes in parameter expansions
  - Properly print assignments using escaped newlines
  - Print inline heredoc comments in the right place
- **interp**
  - Always expand `~` in Bash test expressions
- **expand**
  - Don't panic on out of bounds array index expansions

## [3.2.0] - 2020-10-29

- **cmd/shfmt**
  - Add a man page via [scdoc](https://sr.ht/~sircmpwn/scdoc); see [shfmt.1.scd](cmd/shfmt/shfmt.1.scd)
  - Add `-filename` to give a name to standard input
- **syntax**
  - Add initial support for [Bats](https://github.com/bats-core/bats-core)
  - Protect line and column position numbers against overflows
  - Rewrite arithmetic parsing to fix operator precedence
  - Don't add parentheses to `function f {...}` declarations for ksh support
  - `KeepPadding` now obeys extra indentation when using space indentation
  - Properly tokenize `((` within test expressions
  - Properly tokenize single quotes within parameter expansions
  - Obey print options inside `<<-` heredocs
  - Don't simplify indexed parameter expansions in arithmetic expressions
  - Improve parsing errors for missing test expressions
  - `LangVariant` now implements [flag.Value](https://golang.org/pkg/flag/#Value)
- **interp**
  - Avoid panic on C-style loops which omit expressions
  - `$@` and `$*` always exist, so `"$@"` can expand to zero words

## [3.1.2] - 2020-06-26

- **syntax**
  - Fix brace indentation when using `FunctionNextLine`
  - Support indirect parameter expansions with transformations
  - Stop heredoc bodies only when the entire line matches
- **interp**
  - Make the tests pass on 32-bit platforms

## [3.1.1] - 2020-05-04

- **cmd/shfmt**
  - Recognise `function_next_line` in EditorConfig files
- **syntax**
  - Don't ignore escaped newlines at the end of heredoc bodies
  - Improve support for parsing regexes in test expressions
  - Count columns for `KeepPadding` in bytes, to better support unicode
  - Never let `KeepPadding` add spaces right after indentation
- **interp**
  - Hide unset variables when executing programs

## [3.1.0] - 2020-04-07

- Redesigned Docker images, including buildx and an Alpine variant
- **cmd/shfmt**
  - Replace source files atomically when possible
  - Support `ignore = true` in an EditorConfig to skip directories
  - Add `-fn` to place function opening braces on the next line
  - Improve behavior of `-f` when given non-directories
  - Docker images and `go get` installs now embed good version information
- **syntax**
  - Add support for nested here-documents
  - Allow parsing for loops with braces, present in mksh and Bash
  - Expand `CaseClause` to describe its `in` token
  - Allow empty lines in Bash arrays in the printer
  - Support disabling `KeepPadding`
  - Avoid mis-printing some programs involving `&`
- **interp**
  - Add initial support for Bash process substitutions
  - Add initial support for aliases
  - Fix an edge case where the status code would not be reset
  - The exit status code can now reflect being stopped by a signal
  - `test -t` now uses the interpreter's stdin/stdout/stderr files
- **expand**
  - Improve the interaction of `@` and `*` with quotes and `IFS`

## [3.0.2] - 2020-02-22

- **syntax**
  - Don't indent after escaped newlines in heredocs
  - Don't parse `*[i]=x` as a valid assignment
- **interp**
  - Prevent subshells from defining funcs in the parent shells
- **expand**
  - Parameters to `Fields` no longer get braces expanded in-place

## [3.0.1] - 2020-01-11

- **cmd/shfmt**
  - Fix an edge case where walking directories could panic
- **syntax**
  - Only do a trailing read in `Parser.Stmts` if we have open heredocs
  - Ensure comments are never folded into heredocs
  - Properly tokenize `)` after a `=~` test regexp
  - Stop parsing a comment at an escaped newline
- **expand**
  - `"$@"` now expands to zero fields when there are zero parameters

## [3.0.0] - 2019-12-16

This is the first stable release as a proper module, now under
`mvdan.cc/sh/v3/...`. Go 1.12 or later is supported.

A large number of changes have been done since the last feature release a year
ago. All users are encouraged to update. Below are the major highlights.

- **cmd/shfmt**
  - Support for [EditorConfig](https://editorconfig.org/) files
  - Drop the dependency on `diff` for the `-d` flag, now using pure Go
- **syntax**
  - Overhaul escaped newlines, now represented as `WordPart` positions
  - Improve some operator type names, to consistently convey meaning
  - Completely remove `StmtList`
  - Redesign `IfClause`, making its "else" another `IfClause` node
  - Redesign `DeclClause` to remove its broken `Opts` field
  - Brace expression parsing is now done with a `BraceExp` word part
  - Improve comment alignment in `Printer` via a post-process step
  - Add support for the `~` bitwise negation operator
  - Record the use of deprecated tokens in the syntax tree
- **interp**
  - Improve the module API as "handlers", to reduce confusion with Go modules
  - Split `LookPath` out of `ExecHandler` to allow custom behavior
  - `Run` now returns `nil` instead of `ShellExitStatus(0)`
  - `OpenDevImpls` is removed; see `ExampleOpenHandler` for an alternative
- **expand**
  - Redesign `Variable` to reduce allocations
  - Add support for more escape sequences
  - Make `Config` a bit more powerful via `func` fields
  - Rework brace expansion via the new `BraceExp` word part
- **pattern**
  - New package for shell pattern matching, extracted from `syntax`
  - Add support for multiple modes, including filenames and braces

Special thanks to Konstantin Kulikov for his contribution to this release.

## [2.6.4] - 2019-03-10

- **syntax**
  - Support array elements without values, like `declare -A x=([index]=)`
  - Parse `for i; do ...` uniquely, as it's short for `for i in "$@"`
  - Add missing error on unclosed nested backquotes
- **expand**
  - Don't expand tildes twice, fixing `echo ~` on Windows
- **interp**
  - Fix the use of `Params` as an option to `New`
  - Support lowercase Windows volume names in `$PATH`

## [2.6.3] - 2019-01-19

- **expand**
  - Support globs with path prefixes and suffixes, like `./foo/*/`
  - Don't error when skipping non-directories in glob walks

## [2.6.2] - 2018-12-08

- **syntax**
  - Avoid premature reads in `Parser.Interactive` when parsing Unicode bytes
  - Fix parsing of certain Bash test expression involving newlines
  - `Redirect.End` now takes the `Hdoc` field into account
  - `ValidName` now returns `false` for an empty string
- **expand**
  - Environment variables on Windows are case insensitive again
- **interp**
  - Don't crash on `declare $unset=foo`
  - Fix a regression where executed programs would receive a broken environment

Note that the published Docker image was changed to set `shfmt` as the
entrypoint, so previous uses with arguments like `docker run mvdan/shfmt:v2.6.1
shfmt --version` should now be `docker run mvdan/shfmt:v2.6.2 --version`.

## [2.6.1] - 2018-11-17

- **syntax**
  - Fix `Parser.Incomplete` with some incomplete literals
  - Fix parsing of Bash regex tests in some edge cases
- **interp**
  - Add support for `$(<file)` special command substitutions

## [2.6.0] - 2018-11-10

This is the biggest v2 release to date. It's now possible to write an
interactive shell, and it's easier and safer to perform shell expansions.

This will be the last major v2 version, to allow converting the project to a Go
module in v3.

- Go 1.10 or later required to build
- **syntax**
  - Add `Parser.Interactive` to implement an interactive shell
  - Add `Parser.Document` to parse a single here-document body
  - Add `Parser.Words` to incrementally parse separate words
  - Add the `Word.Lit` helper method
  - Support custom indentation in `<<-` heredoc bodies
- **interp**
  - Stabilize API and add some examples
  - Introduce a constructor, and redesign `Runner.Reset`
  - Move the context from a field to function parameters
  - Remove `Runner.Stmt` in favor of `Run` with `ShellExitStatus`
- **shell**
  - Stabilize API and add some examples
  - Add `Expand`, as a more powerful `os.Expand`
  - Add `Fields`, similar to the old `Runner.Fields`
  - `Source*` functions now take a context
  - `Source*` functions no longer try to sandbox
- **expand**
  - New package, split from `interp`
  - Allows performing shell expansions in a controlled way
  - Redesigned `Environ` and `Variable` moved from `interp`

## [2.5.1] - 2018-08-03

- **syntax**
  - Fix a regression where semicolons would disappear within switch cases

## [2.5.0] - 2018-07-13

- **syntax**
  - Add support for Bash's `{varname}<` redirects
  - Add `SpaceRedirects` to format redirects like `> word`
  - Parse `$\"` correctly within double quotes
  - A few fixes where minification would break programs
  - Printing of heredocs within `<()` no longer breaks them
  - Printing of single statements no longer adds empty lines
  - Error on invalid parameter names like `${1a}`
- **interp**
  - `Runner.Dir` is now always an absolute path
- **shell**
  - `Expand` now supports expanding a lone `~`
  - `Expand` and `SourceNode` now have default timeouts
- **cmd/shfmt**
  - Add `-sr` to print spaces after redirect operators
  - Don't skip empty string values in `-tojson`
  - Include comment positions in `-tojson`

## [2.4.0] - 2018-05-16

- Publish as a JS package, [mvdan-sh](https://www.npmjs.com/package/mvdan-sh)
- **syntax**
  - Add `DebugPrint` to pretty-print a syntax tree
  - Fix comment parsing and printing in some edge cases
  - Indent `<<-` heredoc bodies if indenting with tabs
  - Add support for nested backquotes
  - Relax parser to allow quotes in arithmetic expressions
  - Don't rewrite `declare foo=` into `declare foo`
- **interp**
  - Add support for `shopt -s globstar`
  - Replace `Runner.Env` with an interface
- **shell**
  - Add `Expand` as a fully featured version of `os.Expand`
- **cmd/shfmt**
  - Set appropriate exit status when `-d` is used

## [2.3.0] - 2018-03-07

- **syntax**
  - Case clause patterns are no longer forced on a single line
  - Add `ExpandBraces`, to perform Bash brace expansion on words
  - Improve the handling of backslashes within backquotes
  - Improve the parsing of Bash test regexes
- **interp**
  - Support `$DIRSTACK`, `${param[@]#word}`, and `${param,word}`
- **cmd/shfmt**
  - Add `-d`, to display diffs when formatting differs
  - Promote `-exp.tojson` to `-tojson`
  - Add `Pos` and `End` fields to nodes in `-tojson`
  - Inline `StmtList` fields to simplify the `-tojson` output
  - Support `-l` on standard input

## [2.2.1] - 2018-01-25

- **syntax**
  - Don't error on `${1:-default}`
  - Allow single quotes in `${x['str key']}` as well as double quotes
  - Add support for `${!foo[@]}`
  - Don't simplify `foo[$x]` to `foo[x]`, to not break string indexes
  - Fix `Stmt.End` when the end token is the background operator `&`
  - Never apply the negation operator `!` to `&&` and `||` lists
  - Apply the background operator `&` to entire `&&` and `||` lists
  - Fix `StopAt` when the stop string is at the beginning of the source
  - In `N>word`, check that `N` is a valid numeric literal
  - Fix a couple of crashers found via fuzzing
- **cmd/shfmt**
  - Don't error if non-bash files can't be written to

## [2.2.0] - 2018-01-18

- Tests on Mac and Windows are now ran as part of CI
- **syntax**
  - Add `StopAt` to stop lexing at a custom arbitrary token
  - Add `TranslatePattern` and `QuotePattern` for pattern matching
  - Minification support added to the printer - see `Minify`
  - Add ParamExp.Names to represent `${!prefix*}`
  - Add TimeClause.PosixFormat for its `-p` flag
  - Fix parsing of assignment values containing `=`
  - Fix parsing of parameter expansions followed by a backslash
  - Fix quotes in parameter expansion operators like `${v:-'def'}`
  - Fix parsing of negated declare attributes like `declare +x name`
  - Fix parsing of `${#@}`
  - Reject bad parameter expansion operators like `${v@WRONG}`
  - Reject inline array variables like `a=(b c) prog`
  - Reject indexing of special vars like `${1[3]}`
  - Reject `${!name}` when in POSIX mode
  - Reject multiple parameter expansion actions like `${#v:-def}`
- **interp**
  - Add Bash brace expansion support, including `{a,b}` and `{x..y}`
  - Pattern matching actions are more correct and precise
  - Exported some Runner internals, including `Vars` and `Funcs`
  - Use the interpreter's `$PATH` to find binaries
  - Roll our own globbing to use our own pattern matching code
  - Support the `getopts` sh builtin
  - Support the `read` bash builtin
  - Numerous changes to improve Windows support
- **shell**
  - New experimental package with high-level utility functions
  - Add `SourceFile` to get the variables declared in a script
  - Add `SourceNode` as a lower-level version of the above
- **cmd/shfmt**
  - Add `-mn`, which minifies programs via `syntax.Minify`

## [2.1.0] - 2017-11-25

- **syntax**
  - Add `Stmts`, to parse one statement at a time
  - Walk no longer ignores comments
  - Parameter expansion end fixes, such as `$foo.bar`
  - Whitespace alignment can now be kept - see `KeepPadding`
  - Introduce an internal newline token to simplify the parser
  - Fix `Block.Pos` to actually return the start position
  - Fix mishandling of inline comments in two edge cases
- **interp**
  - Expose `Fields` to expand words into strings
  - First configurable modules - cmds and files
  - Add support for the new `TimeClause`
  - Add support for namerefs and readonly vars
  - Add support for associative arrays (maps)
  - More sh builtins: `exec return`
  - More bash builtins: `command pushd popd dirs`
  - More `test` operators: `-b -c -t -o`
  - Configurable kill handling - see `KillTimeout`
- **cmd/shfmt**
  - Add `-f` to just list all the shell files found
  - Add `-kp` to keep the column offsets in place
- **cmd/gosh**
  - Now supports a basic interactive mode

## [2.0.0] - 2017-08-30

- The package import paths were moved to `mvdan.cc/sh/...`
- **syntax**
  - Parser and Printer structs introduced with functional options
  - Node positions are now independent - `Position` merged into `Pos`
  - All comments are now attached to nodes
  - Support `mksh` - MirBSD's Korn Shell, used in Android
  - Various changes to the AST:
    - `EvalClause` removed; `eval` is no longer parsed as a keyword
    - Add support for Bash's `time` and `select`
    - Merge `UntilClause` into `WhileClause`
    - Moved `Stmt.Assigns` to `CallExpr.Assigns`
    - Remove `Elif` - chain `IfClause` nodes instead
  - Support for indexed assignments like `a[i]=b`
  - Allow expansions in arithmetic expressions again
  - Unclosed heredocs now produce an error
  - Binary ops are kept in the same line - see `BinaryNextLine`
  - Switch cases are not indented by default - see `SwitchCaseIndent`
- **cmd/shfmt**
  - Add `-s`, which simplifies programs via `syntax.Simplify`
  - Add `-ln <lang>`, like `-ln mksh`
  - Add `-bn` to put binary ops in the next line, like in v1
  - Add `-ci` to indent switch cases, like in v1
- **interp**
  - Some progress made, though still experimental
  - Most of POSIX done - some builtins remain to be done

## [1.3.1] - 2017-05-26

- **syntax**
  - Fix parsing of `${foo[$bar]}`
  - Fix printer regression where `> >(foo)` would be turned into `>>(foo)`
  - Break comment alignment on any line without a comment, fixing formatting issues
  - Error on keywords like `fi` and `done` used as commands

## [1.3.0] - 2017-04-24

- **syntax**
  - Fix backslashes in backquote command substitutions
  - Disallow some test expressions like `[[ a == ! b ]]`
  - Disallow some parameter expansions like `${$foo}`
  - Disallow some arithmetic expressions like `((1=3))` and `(($(echo 1 + 2)))`
  - Binary commands like `&&`, `||` and pipes are now left-associative
- **fileutil**
  - `CouldBeScript` may now return true on non-regular files such as symlinks
- **interp**
  - New experimental package to interpret a `syntax.File` in pure Go

## [1.2.0] - 2017-02-22

- **syntax**
  - Add support for escaped characters in bash regular expressions
- **fileutil**
  - New package with some code moved from `cmd/shfmt`, now importable
  - New funcs `HasShebang` and `CouldBeScript`
  - Require shebangs to end with whitespace to reject `#!/bin/shfoo`

## [1.1.0] - 2017-01-05

- **syntax**
  - Parse `[[ a = b ]]` like `[[ a == b ]]`, deprecating `TsAssgn` in favour of `TsEqual`
  - Add support for the `-k`, `-G`, `-O` and `-N` unary operators inside `[[ ]]`
  - Add proper support for `!` in parameter expansions, like `${!foo}`
  - Fix a couple of crashes found via fuzzing
- **cmd/shfmt**
  - Rewrite `[[ a = b ]]` into the saner `[[ a == b ]]` (see above)

## [1.0.0] - 2016-12-13

- **syntax**
  - Stable release, API now frozen
  - `Parse` now reads input in chunks of 1KiB
- **cmd/shfmt**
  - Add `-version` flag

## [0.6.0] - 2016-12-05

- **syntax**
  - `Parse` now takes an `io.Reader` instead of `[]byte`
  - Invalid UTF-8 is now reported as an error
  - Remove backtracking for `$((` and `((`
  - `Walk` now takes a func literal to simplify its use

## [0.5.0] - 2016-11-24

- **cmd/shfmt**
  - Remove `-cpuprofile`
  - Don't read entire files into memory to check for a shebang
- **syntax**
  - Use `uint32` for tokens and positions in nodes
  - Use `Word` and `Lit` pointers consistently instead of values
  - Ensure `Word.Parts` is never empty
  - Add support for expressions in array indexing and parameter expansion slicing

## [0.4.0] - 2016-11-08

- Merge `parser`, `ast`, `token` and `printer` into a single package `syntax`
- Use separate operator types in nodes rather than `Token`
- Use operator value names that express their function
- Keep `;` if on a separate line when formatting
- **cmd/shfmt**
  - Allow whitespace after `#!` in a shebang
- **syntax**
  - Implement operator precedence for `[[ ]]`
  - Parse `$(foo)` and ``foo`` as the same (`shfmt` then converts the latter to the former)
  - Rename `Quoted` to `DblQuoted` for clarity
  - Split `((foo))` nodes as their own type, `ArithmCmd`
  - Add support for bash parameter expansion slicing

## [0.3.0] - 2016-10-26

- Add support for bash's `coproc` and extended globbing like `@(foo)`
- Improve test coverage, adding tests to `cmd/shfmt` and bringing `parser` and `printer` close to 100%
- Support empty C-style for loops like `for ((;;)) ...`
- Support for the `>|` redirect operand
- **cmd/shfmt**
  - Fix issue where `.sh` and `.bash` files might not be walked if running on a directory
  - Fix issue where `-p` was not obeyed when formatting stdin
- **parser**
  - `$''` now generates an `ast.SglQuoted`, not an `ast.Quoted`
  - Support for ambiguous `((` like with `$((`
  - Improve special parameter expansions like `$@` or `$!`
  - Improve bash's `export` `typeset`, `nameref` and `readonly`
  - `<>`, `>&` and `<&` are valid POSIX
  - Support for bash's `^`, `^^`, `,` and `,,` operands inside `${}`

## [0.2.0] - 2016-10-13

- Optimizations all around, making `shfmt` ~15% faster
- **cmd/shfmt**
  - Add `-p` flag to only accept POSIX Shell programs (`parser.PosixConformant`)
- **parser**
  - Add support for ambiguous `$((` as in `$((foo) | bar)`
  - Limit more bash features to `PosixConformant` being false
  - Don't parse heredoc bodies in nested expansions and contexts
  - Run tests through `bash` to confirm the presence of a parse error
- **ast**
  - Add `Walk(Visitor, Node)` function

## [0.1.0] - 2016-09-20

Initial release.

[3.2.4]: https://github.com/mvdan/sh/releases/tag/v3.2.4
[3.2.2]: https://github.com/mvdan/sh/releases/tag/v3.2.2
[3.2.1]: https://github.com/mvdan/sh/releases/tag/v3.2.1
[3.2.0]: https://github.com/mvdan/sh/releases/tag/v3.2.0
[3.1.2]: https://github.com/mvdan/sh/releases/tag/v3.1.2
[3.1.1]: https://github.com/mvdan/sh/releases/tag/v3.1.1
[3.1.0]: https://github.com/mvdan/sh/releases/tag/v3.1.0
[3.0.2]: https://github.com/mvdan/sh/releases/tag/v3.0.2
[3.0.1]: https://github.com/mvdan/sh/releases/tag/v3.0.1
[3.0.0]: https://github.com/mvdan/sh/releases/tag/v3.0.0
[2.6.4]: https://github.com/mvdan/sh/releases/tag/v2.6.4
[2.6.3]: https://github.com/mvdan/sh/releases/tag/v2.6.3
[2.6.2]: https://github.com/mvdan/sh/releases/tag/v2.6.2
[2.6.1]: https://github.com/mvdan/sh/releases/tag/v2.6.1
[2.6.0]: https://github.com/mvdan/sh/releases/tag/v2.6.0
[2.5.1]: https://github.com/mvdan/sh/releases/tag/v2.5.1
[2.5.0]: https://github.com/mvdan/sh/releases/tag/v2.5.0
[2.4.0]: https://github.com/mvdan/sh/releases/tag/v2.4.0
[2.3.0]: https://github.com/mvdan/sh/releases/tag/v2.3.0
[2.2.1]: https://github.com/mvdan/sh/releases/tag/v2.2.1
[2.2.0]: https://github.com/mvdan/sh/releases/tag/v2.2.0
[2.1.0]: https://github.com/mvdan/sh/releases/tag/v2.1.0
[2.0.0]: https://github.com/mvdan/sh/releases/tag/v2.0.0
[1.3.1]: https://github.com/mvdan/sh/releases/tag/v1.3.1
[1.3.0]: https://github.com/mvdan/sh/releases/tag/v1.3.0
[1.2.0]: https://github.com/mvdan/sh/releases/tag/v1.2.0
[1.1.0]: https://github.com/mvdan/sh/releases/tag/v1.1.0
[1.0.0]: https://github.com/mvdan/sh/releases/tag/v1.0.0
[0.6.0]: https://github.com/mvdan/sh/releases/tag/v0.6.0
[0.5.0]: https://github.com/mvdan/sh/releases/tag/v0.5.0
[0.4.0]: https://github.com/mvdan/sh/releases/tag/v0.4.0
[0.3.0]: https://github.com/mvdan/sh/releases/tag/v0.3.0
[0.2.0]: https://github.com/mvdan/sh/releases/tag/v0.2.0
[0.1.0]: https://github.com/mvdan/sh/releases/tag/v0.1.0
07070100000006000081A4000003E800000064000000016046124D000005D0000000000000000000000000000000000000001100000000sh-3.2.4/LICENSECopyright (c) 2016, Daniel Martí. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
   * Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
07070100000007000081A4000003E800000064000000016046124D00001644000000000000000000000000000000000000001300000000sh-3.2.4/README.md# sh

[![GoDoc](https://godoc.org/mvdan.cc/sh?status.svg)](https://godoc.org/mvdan.cc/sh)

A shell parser, formatter, and interpreter. Supports [POSIX Shell], [Bash], and
[mksh]. Requires Go 1.14 or later.

### Quick start

To parse shell scripts, inspect them, and print them out, see the [syntax
examples](https://godoc.org/mvdan.cc/sh/syntax#pkg-examples).

For high-level operations like performing shell expansions on strings, see the
[shell examples](https://godoc.org/mvdan.cc/sh/shell#pkg-examples).

### shfmt

GO111MODULE=on go get mvdan.cc/sh/v3/cmd/shfmt

`shfmt` formats shell programs. See [canonical.sh](syntax/canonical.sh) for a
quick look at its default style. For example:

shfmt -l -w script.sh

For more information, see [its manpage](cmd/shfmt/shfmt.1.scd), which can be
viewed directly as Markdown or rendered with [scdoc].

Packages are available on [Alpine], [Arch], [Docker], [FreeBSD], [Homebrew],
[MacPorts], [NixOS], [Scoop], [Snapcraft], and [Void].

### gosh

GO111MODULE=on go get mvdan.cc/sh/v3/cmd/gosh

Proof of concept shell that uses `interp`. Note that it's not meant to replace a
POSIX shell at the moment, and its options are intentionally minimalistic.

### Fuzzing

This project makes use of [go-fuzz] to find crashes and hangs in both the parser
and the printer. To get started, run:

git checkout fuzz
	./fuzz

### Caveats

* When indexing Bash associative arrays, always use quotes. The static parser
  will otherwise have to assume that the index is an arithmetic expression.

```sh
$ echo '${array[spaced string]}' | shfmt
1:16: not a valid arithmetic operator: string
$ echo '${array[dash-string]}' | shfmt
${array[dash - string]}
```

* `$((` and `((` ambiguity is not supported. Backtracking would complicate the
  parser and make streaming support via `io.Reader` impossible. The POSIX spec
  recommends to [space the operands][posix-ambiguity] if `$( (` is meant.

```sh
$ echo '$((foo); (bar))' | shfmt
1:1: reached ) without matching $(( with ))
```

* Some builtins like `export` and `let` are parsed as keywords. This is to allow
  statically parsing them and building their syntax tree, as opposed to just
  keeping the arguments as a slice of arguments.

### JavaScript

A subset of the Go packages are available as an npm package called [mvdan-sh].
See the [_js](_js) directory for more information.

### Docker

To build a Docker image, checkout a specific version of the repository and run:

docker build -t my:tag -f cmd/shfmt/Dockerfile .

This creates an image that only includes shfmt. Alternatively, if you want an
image that includes alpine, add `--target alpine`.
To use the Docker image, run:

docker run --rm -v $PWD:/mnt -w /mnt my:tag <shfmt arguments>

### pre-commit

It is possible to use shfmt with [pre-commit][pre-commit] and a `local`
repo configuration like:

```yaml
  - repo: local
    hooks:
      - id: shfmt
        name: shfmt
        minimum_pre_commit_version: 2.4.0
        language: golang
        additional_dependencies: [mvdan.cc/sh/v3/cmd/shfmt@v3.2.0]
        entry: shfmt
        args: [-w]
        types: [shell]
```

### Related projects

The following editor integrations wrap `shfmt`:

- [format-shell] - Atom plugin
- [intellij-shellcript] - Intellij Jetbrains `shell script` plugin
- [micro] - Editor with a built-in plugin
- [shell-format] - VS Code plugin
- [shfmt.el] - Emacs package
- [Sublime-Pretty-Shell] - Sublime Text 3 plugin
- [vim-shfmt] - Vim plugin

Other noteworthy integrations include:

- Alternative docker image by [PeterDaveHello][dockerized-peterdavehello]
- [modd] - A developer tool that responds to filesystem changes
- [prettier-plugin-sh] - [Prettier] plugin using [mvdan-sh]
- [sh-checker] - A GitHub Action that performs static analysis for shell scripts

[alpine]: https://pkgs.alpinelinux.org/packages?name=shfmt
[arch]: https://www.archlinux.org/packages/community/x86_64/shfmt/
[bash]: https://www.gnu.org/software/bash/
[docker]: https://hub.docker.com/r/mvdan/shfmt/
[dockerized-peterdavehello]: https://github.com/PeterDaveHello/dockerized-shfmt/
[editorconfig]: https://editorconfig.org/
[examples]: https://godoc.org/mvdan.cc/sh/syntax#pkg-examples
[format-shell]: https://atom.io/packages/format-shell
[freebsd]: https://www.freshports.org/devel/shfmt
[go-fuzz]: https://github.com/dvyukov/go-fuzz
[homebrew]: https://formulae.brew.sh/formula/shfmt
[intellij-shellcript]: https://www.jetbrains.com/help/idea/shell-scripts.html
[macports]: https://ports.macports.org/port/shfmt/summary
[micro]: https://micro-editor.github.io/
[mksh]: http://www.mirbsd.org/mksh.htm
[modd]: https://github.com/cortesi/modd
[mvdan-sh]: https://www.npmjs.com/package/mvdan-sh
[nixos]: https://github.com/NixOS/nixpkgs/blob/HEAD/pkgs/tools/text/shfmt/default.nix
[posix shell]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
[posix-ambiguity]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_03
[prettier]: https://prettier.io
[prettier-plugin-sh]: https://github.com/rx-ts/prettier/tree/master/packages/sh
[scdoc]: https://sr.ht/~sircmpwn/scdoc/
[scoop]: https://github.com/ScoopInstaller/Main/blob/HEAD/bucket/shfmt.json
[sh-checker]: https://github.com/luizm/action-sh-checker
[shell-format]: https://marketplace.visualstudio.com/items?itemName=foxundermoon.shell-format
[shfmt.el]: https://github.com/purcell/emacs-shfmt/
[snapcraft]: https://snapcraft.io/shfmt
[sublime-pretty-shell]: https://github.com/aerobounce/Sublime-Pretty-Shell
[vim-shfmt]: https://github.com/z0mbix/vim-shfmt
[void]: https://github.com/void-linux/void-packages/blob/HEAD/srcpkgs/shfmt/template
[pre-commit]: https://pre-commit.com
07070100000008000041ED000003E800000064000000036046124D00000000000000000000000000000000000000000000000F00000000sh-3.2.4/_fuzz07070100000009000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001200000000sh-3.2.4/_fuzz/it0707010000000A000081A4000003E800000064000000016046124D000004CF000000000000000000000000000000000000001A00000000sh-3.2.4/_fuzz/it/fuzz.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// +build gofuzz

package sh

import (
	"bytes"
	"io/ioutil"

"mvdan.cc/sh/v3/syntax"
)

func Fuzz(data []byte) int {
	// first byte masks for parser/printer options:
	//   1: posix, not bash
	//   2: mksh, not bash
	//   4: keep comments
	//   8: simplify
	//  16: indent with spaces
	//  32: binary next line
	//  64: switch case indent
	// 128: keep padding
	if len(data) < 1 {
		return 0
	}
	opts, src := data[0], data[1:]
	parser := syntax.NewParser()
	lang := syntax.LangBash
	if opts&0x01 != 0 {
		lang = syntax.LangPOSIX
	} else if opts&0x02 != 0 {
		lang = syntax.LangMirBSDKorn
	}
	syntax.Variant(lang)(parser)
	if opts&0x04 != 0 {
		syntax.KeepComments(true)(parser)
	}
	prog, err := parser.Parse(bytes.NewReader(src), "")
	if err != nil {
		return 0
	}
	if opts&0x08 != 0 {
		syntax.Simplify(prog)
	}
	printer := syntax.NewPrinter()
	if opts&0x10 != 0 {
		syntax.Indent(4)(printer)
	}
	if opts&0x20 != 0 {
		syntax.BinaryNextLine(true)(printer)
	}
	if opts&0x40 != 0 {
		syntax.SwitchCaseIndent(true)(printer)
	}
	if opts&0x80 != 0 {
		syntax.KeepPadding(true)(printer)
	}
	printer.Print(ioutil.Discard, prog)
	return 1
}
0707010000000B000081A4000003E800000064000000016046124D000001C8000000000000000000000000000000000000001900000000sh-3.2.4/_fuzz/it/go.modmodule local.tld/fuzz

go 1.14

replace mvdan.cc/sh/v3 => ./../..

require (
	github.com/davecgh/go-spew v1.1.1 // indirect
	github.com/dvyukov/go-fuzz v0.0.0-20191008232133-fdaa9b19a67d
	github.com/elazarl/go-bindata-assetfs v1.0.0 // indirect
	github.com/stephens2424/writerset v1.0.2 // indirect
	golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a // indirect
	gopkg.in/yaml.v2 v2.2.4 // indirect
	mvdan.cc/sh/v3 v3.0.0-00010101000000-000000000000
)
0707010000000C000081A4000003E800000064000000016046124D000011E7000000000000000000000000000000000000001900000000sh-3.2.4/_fuzz/it/go.sumgithub.com/Julusian/godocdown v0.0.0-20170816220326-6d19f8ff2df8/go.mod h1:INZr5t32rG59/5xeltqoCJoNY7e5x/3xoY9WSWVWg74=
github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dvyukov/go-fuzz v0.0.0-20191008232133-fdaa9b19a67d h1:yKiqxmysK1RMmKMhYJ2Pbv2RsrJDL4vhBzS8CmH9Juc=
github.com/dvyukov/go-fuzz v0.0.0-20191008232133-fdaa9b19a67d/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
github.com/elazarl/go-bindata-assetfs v1.0.0 h1:G/bYguwHIzWq9ZoyUQqrjTmJbbYn3j3CKKpKinvZLFk=
github.com/elazarl/go-bindata-assetfs v1.0.0/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4=
github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pkg/diff v0.0.0-20200914180035-5b29258ca4f7/go.mod h1:zO8QMzTeZd5cpnIkz/Gn6iK0jDfGicM1nynOkkPIl28=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/robertkrimen/godocdown v0.0.0-20130622164427-0bfa04905481/go.mod h1:C9WhFzY47SzYBIvzFqSvHIR6ROgDo4TtdTuRaOMjF/s=
github.com/rogpeppe/go-internal v1.6.2/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
github.com/stephens2424/writerset v1.0.2 h1:znRLgU6g8RS5euYRcy004XeE4W+Tu44kALzy7ghPif8=
github.com/stephens2424/writerset v1.0.2/go.mod h1:aS2JhsMn6eA7e82oNmW4rfsgAOp9COBTTl8mzkwADnc=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200929083018-4d22bbb62b3c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a h1:TwMENskLwU2NnWBzrJGEWHqSiGUkO/B4rfyhwqDxDYQ=
golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157/go.mod h1:Ge4atmRUYqueGppvJ7JNrtqpqokoJEFxYbP0Z+WeKS8=
0707010000000D000081A4000003E800000064000000016046124D00000081000000000000000000000000000000000000001B00000000sh-3.2.4/_fuzz/it/tools.go// +build tools

package tools

import (
	_ "github.com/dvyukov/go-fuzz/go-fuzz"
	_ "github.com/dvyukov/go-fuzz/go-fuzz-build"
)
0707010000000E000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000000D00000000sh-3.2.4/_js0707010000000F000081A4000003E800000064000000016046124D000005D0000000000000000000000000000000000000001500000000sh-3.2.4/_js/LICENSECopyright (c) 2016, Daniel Martí. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
07070100000010000081A4000003E800000064000000016046124D00000B83000000000000000000000000000000000000001700000000sh-3.2.4/_js/README.md## mvdan-sh

This package is a JavaScript version of a shell package written in Go, available
at https://github.com/mvdan/sh.

It is transpiled from Go to JS using a GopherJS fork, available at
https://github.com/myitcv/gopherjs.

### Sample usage

```
const sh = require('mvdan-sh')
const syntax = sh.syntax

var parser = syntax.NewParser()
var printer = syntax.NewPrinter()

var src = "echo 'foo'"
var f = parser.Parse(src, "src.sh")

// print out the syntax tree
syntax.DebugPrint(f)
console.log()

// replace all single quoted string values
syntax.Walk(f, function(node) {
        if (syntax.NodeType(node) == "SglQuoted") {
                node.Value = "bar"
        }
        return true
})

// print the code back out
console.log(printer.Print(f)) // echo 'bar'
```

You can find more samples in
[testmain.js](https://github.com/mvdan/sh/blob/master/_js/testmain.js).

### Available APIs

The APIs listed below are wrapped to be usable in JavaScript. Follow the links
to read their documentation.

* [syntax.NewParser](https://godoc.org/mvdan.cc/sh/syntax#NewParser)
  - [Parser.Parse](https://godoc.org/mvdan.cc/sh/syntax#Parser.Parse)
  - [Parser.Interactive](https://godoc.org/mvdan.cc/sh/syntax#Parser.Interactive)
  - [Parser.Incomplete](https://godoc.org/mvdan.cc/sh/syntax#Parser.Incomplete)
* [syntax.DebugPrint](https://godoc.org/mvdan.cc/sh/syntax#DebugPrint)
* [syntax.Walk](https://godoc.org/mvdan.cc/sh/syntax#Walk)
* [syntax.NewPrinter](https://godoc.org/mvdan.cc/sh/syntax#NewPrinter)
  - [Printer.Print](https://godoc.org/mvdan.cc/sh/syntax#Printer.Print)

Constructor options like
[syntax.KeepComments](https://godoc.org/mvdan.cc/sh/syntax#KeepComments) are
also available.

The original `io.Reader` parameters can take a string or a
[stream.Readable](https://nodejs.org/api/stream.html#stream_class_stream_readable)
object. `io.Writer` parameters are replaced by string returns.

The nodes you will find in the syntax tree are all equivalent to the nodes you
will see on the Go API. To get the type of a node, use `syntax.NodeType` as the
example above shows. Some of the most common node types include:

* [syntax.File](https://godoc.org/mvdan.cc/sh/syntax#File)
* [syntax.Stmt](https://godoc.org/mvdan.cc/sh/syntax#Stmt)
* [syntax.CallExpr](https://godoc.org/mvdan.cc/sh/syntax#CallExpr)
* [syntax.Word](https://godoc.org/mvdan.cc/sh/syntax#Word)
* [syntax.Lit](https://godoc.org/mvdan.cc/sh/syntax#Lit)

The five above will show up in your syntax tree if you parse a `echo foo`
command, which you can see if you use `syntax.DebugPrint` to inspect the syntax
tree.

### Building

You will need:

* Latest Go 1.11.x
* Latest `gopherjs` from @myitcv's fork: https://github.com/myitcv/gopherjs
* NodeJS, to run the `testmain.js` test suite

Then, simply run `./build`. The result will be `index.js`, which isn't minified.
At the time of writing, `index.js` weighs 1.7MiB in plaintext, and 220KiB when
minified and gzipped.
07070100000011000081A4000003E800000064000000016046124D0000173A000000000000000000000000000000000000001900000000sh-3.2.4/_js/api_dump.go// Copyright (c) 2019, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// +build ignore

// api_dump is a simple program to create a description of what the syntax
// package's API is. The main purpose is so that the JS package users can
// inspect the API programmatically, to generate documentation, code, etc.
//
// To run with Go 1.11 or later: GO111MODULE=on go run api_dump.go

package main

import (
	"encoding/json"
	"fmt"
	"go/ast"
	"go/token"
	"go/types"
	"os"
	"reflect"

"golang.org/x/tools/go/packages"
)

type Package struct {
	Types map[string]NamedType `json:"types"`
	Funcs map[string]DocType   `json:"funcs"`
}

type NamedType struct {
	Doc  string      `json:"doc"`
	Type interface{} `json:"type"`

EnumValues   []string `json:"enumvalues,omitempty"`
	Implementers []string `json:"implementers,omitempty"`

Methods map[string]DocType `json:"methods"`
}

type DocType struct {
	Doc  string      `json:"doc"`
	Type interface{} `json:"type"`
}

func main() {
	cfg := &packages.Config{Mode: packages.LoadSyntax}
	pkgs, err := packages.Load(cfg, "mvdan.cc/sh/v3/syntax")
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
	if packages.PrintErrors(pkgs) > 0 {
		os.Exit(1)
	}
	if len(pkgs) != 1 {
		panic("expected exactly one package")
	}

dump := &Package{
		Types: map[string]NamedType{},
		Funcs: map[string]DocType{},
	}

// from identifier position to its doc
	docs := make(map[token.Pos]*ast.CommentGroup)

pkg := pkgs[0]
	for _, file := range pkg.Syntax {
		ast.Inspect(file, func(node ast.Node) bool {
			switch node := node.(type) {
			case *ast.FuncDecl:
				docs[node.Name.Pos()] = node.Doc
			case *ast.GenDecl:
				if len(node.Specs) != 1 {
					break
				}
				// TypeSpec.Doc is sometimes not passed on
				switch spec := node.Specs[0].(type) {
				case *ast.TypeSpec:
					spec.Doc = node.Doc
				}
			case *ast.TypeSpec:
				docs[node.Name.Pos()] = node.Doc
			case *ast.Field:
				if len(node.Names) != 1 {
					break
				}
				docs[node.Names[0].Pos()] = node.Doc
			case *ast.ValueSpec:
				if len(node.Names) != 1 {
					break
				}
				docs[node.Names[0].Pos()] = node.Doc
			}
			return true
		})
	}

scope := pkg.Types.Scope()
	var allImpls []*types.Pointer
	var allConsts []*types.Const

for _, name := range scope.Names() {
		obj := scope.Lookup(name)
		if !obj.Exported() {
			continue
		}
		switch obj := obj.(type) {
		case *types.TypeName:
			// not interfaces
			if _, ok := obj.Type().(*types.Interface); !ok {
				// include pointer receivers too
				allImpls = append(allImpls, types.NewPointer(obj.Type()))
			}
		case *types.Const:
			allConsts = append(allConsts, obj)
		}
	}

for _, name := range scope.Names() {
		obj := scope.Lookup(name)
		if !obj.Exported() {
			continue
		}
		if fn, ok := obj.(*types.Func); ok {
			dump.Funcs[fn.Name()] = DocType{
				Doc:  docs[fn.Pos()].Text(),
				Type: dumpType(docs, fn.Type()),
			}
			continue
		}
		tname, ok := obj.(*types.TypeName)
		if !ok {
			continue
		}
		name := tname.Name()
		named, ok := obj.Type().(*types.Named)
		if !ok {
			continue
		}

under := named.Underlying()
		dumpNamed := NamedType{
			Doc:     docs[tname.Pos()].Text(),
			Type:    dumpType(docs, under),
			Methods: map[string]DocType{},
		}
		switch under := under.(type) {
		case *types.Basic:
			if under.Info()&types.IsInteger == 0 {
				break
			}
			for _, cnst := range allConsts {
				if cnst.Type() == named {
					dumpNamed.EnumValues = append(dumpNamed.EnumValues, cnst.Name())
				}
			}
		case *types.Interface:
			for _, typ := range allImpls {
				if types.Implements(typ, under) {
					dumpNamed.Implementers = append(dumpNamed.Implementers, typ.Elem().String())
				}
			}
		}
		for i := 0; i < named.NumMethods(); i++ {
			fn := named.Method(i)
			if !fn.Exported() {
				continue
			}
			dumpNamed.Methods[fn.Name()] = DocType{
				Doc:  docs[fn.Pos()].Text(),
				Type: dumpType(docs, fn.Type()),
			}
		}
		dump.Types[name] = dumpNamed
	}
	enc := json.NewEncoder(os.Stdout)
	enc.SetIndent("", "\t")
	if err := enc.Encode(dump); err != nil {
		fmt.Fprintln(os.Stderr, err)
	}
}

func dumpType(docs map[token.Pos]*ast.CommentGroup, typ types.Type) interface{} {
	dump := map[string]interface{}{}
	switch typ := typ.(type) {
	case *types.Interface:
		dump["kind"] = "interface"
		methods := map[string]DocType{}
		for i := 0; i < typ.NumMethods(); i++ {
			fn := typ.Method(i)
			if !fn.Exported() {
				continue
			}
			methods[fn.Name()] = DocType{
				Doc:  docs[fn.Pos()].Text(),
				Type: dumpType(docs, fn.Type()),
			}
		}
		dump["methods"] = methods
		return dump
	case *types.Struct:
		dump["kind"] = "struct"
		type Field struct {
			Doc      string      `json:"doc"`
			Type     interface{} `json:"type"`
			Embedded bool        `json:"embedded"`
		}
		fields := map[string]Field{}
		for i := 0; i < typ.NumFields(); i++ {
			fd := typ.Field(i)
			if !fd.Exported() {
				continue
			}
			fields[fd.Name()] = Field{
				Doc:      docs[fd.Pos()].Text(),
				Type:     dumpType(docs, fd.Type()),
				Embedded: fd.Embedded(),
			}
		}
		dump["fields"] = fields
		return dump
	case *types.Slice:
		dump["kind"] = "list"
		dump["elem"] = dumpType(docs, typ.Elem())
		return dump
	case *types.Pointer:
		dump["kind"] = "pointer"
		dump["elem"] = dumpType(docs, typ.Elem())
		return dump
	case *types.Signature:
		dump["kind"] = "function"
		dump["params"] = dumpTuple(docs, typ.Params())
		dump["results"] = dumpTuple(docs, typ.Results())
		return dump
	case *types.Basic:
		return typ.String()
	case *types.Named:
		return typ.String()
	}
	panic("TODO: " + reflect.TypeOf(typ).String())
}

func dumpTuple(docs map[token.Pos]*ast.CommentGroup, tuple *types.Tuple) []interface{} {
	typs := make([]interface{}, 0)
	for i := 0; i < tuple.Len(); i++ {
		vr := tuple.At(i)
		typs = append(typs, map[string]interface{}{
			"name": vr.Name(),
			"type": dumpType(docs, vr.Type()),
		})
	}
	return typs
}
07070100000012000081ED000003E800000064000000016046124D000000F3000000000000000000000000000000000000001300000000sh-3.2.4/_js/build#!/bin/sh

if ! go version | grep -q go1.12; then
	echo "Go 1.12.x required to build."
	exit 1
fi

export GO111MODULE=on # build in module-aware mode

go run github.com/gopherjs/gopherjs build -o index.js || exit 1

node testmain.js || exit 1
07070100000013000081A4000003E800000064000000016046124D00000102000000000000000000000000000000000000001400000000sh-3.2.4/_js/go.modmodule shjs

go 1.11

replace github.com/gopherjs/gopherjs => github.com/myitcv/gopherjs v1.12.80

replace mvdan.cc/sh/v3 => ../

require (
	github.com/gopherjs/gopherjs v0.0.0-00010101000000-000000000000
	mvdan.cc/sh/v3 v3.0.0-00010101000000-000000000000
)
07070100000014000081A4000003E800000064000000016046124D00000E09000000000000000000000000000000000000001400000000sh-3.2.4/_js/go.sumgithub.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/myitcv/gopherjs v1.12.0 h1:4QfVBUZ+1vDcNsx/jLHwJPAfkSG3NqOG2OpOxQIYoSI=
github.com/myitcv/gopherjs v1.12.0/go.mod h1:d55Q4EjGQHeJVms+9LGtXul6ykz5Xzx1E1gaXQXdimY=
github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86 h1:D6paGObi5Wud7xg83MaEFyjxQB1W5bz5d0IFppr+ymk=
github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
github.com/neelance/sourcemap v0.0.0-20151028013722-8c68805598ab h1:eFXv9Nu1lGbrNbj619aWwZfVF5HBrm9Plte8aNptuTI=
github.com/neelance/sourcemap v0.0.0-20151028013722-8c68805598ab/go.mod h1:Qr6/a/Q4r9LP1IltGz7tA7iOK1WonHEYhu1HRBA7ZiM=
github.com/rogpeppe/go-internal v1.0.1-alpha.1 h1:NGPDe06RaK5iQFZkqFMNb986UARfoHc9FLyWI7b6+aQ=
github.com/rogpeppe/go-internal v1.0.1-alpha.1/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
github.com/shurcooL/go v0.0.0-20180423040247-9e1955d9fb6e/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk=
github.com/shurcooL/httpfs v0.0.0-20181222201310-74dc9339e414 h1:IYVb70m/qpJGjyZV2S4qbdSDnsMl+w9nsQ2iQedf1HI=
github.com/shurcooL/httpfs v0.0.0-20181222201310-74dc9339e414/go.mod h1:ZY1cvUeJuFPAdZ/B6v7RHavJWZn2YPVFQ1OSXhCGOkg=
github.com/shurcooL/vfsgen v0.0.0-20180915214035-33ae1944be3f/go.mod h1:TrYk7fJVaAttu97ZZKrO9UbRa8izdowaMIZcxYMbVaw=
github.com/spf13/cobra v0.0.3 h1:ZlrZ4XsMRm04Fr5pSFxBgfND2EBVa1nLpiy1stUsX/8=
github.com/spf13/cobra v0.0.3/go.mod h1:1l0Ry5zgKvJasoi3XT1TypsSe7PqH0Sj9dhYf7v3XqQ=
github.com/spf13/pflag v1.0.1 h1:aCvUg6QPl3ibpQUxyLkrEkCHtPqYJL4x9AuhqVqFis4=
github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
golang.org/x/crypto v0.0.0-20180807104621-f027049dab0a h1:PulT0Y50PcfTWomfsD39bSQyVrjjWdIuJKfyR4nOCJw=
golang.org/x/crypto v0.0.0-20180807104621-f027049dab0a/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20181106171534-e4dc69e5b2fd h1:VtIkGDhk0ph3t+THbvXHfMZ8QHgsBO39Nh52+74pq7w=
golang.org/x/crypto v0.0.0-20181106171534-e4dc69e5b2fd/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180807162357-acbc56fc7007 h1:UnHxDq9ldm4vol94wlSWDF3SU4IyC8IWVWtg266CzoY=
golang.org/x/sys v0.0.0-20180807162357-acbc56fc7007/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8 h1:YoY1wS6JYVRpIfFngRf2HHo9R9dAne3xbkGOQ5rJXjU=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/tools v0.0.0-20190308142131-b40df0fb21c3 h1:GPRyd2anWNtiuo1j4VS6+tIW4Qu5bCWKy4sjzUf/3oI=
golang.org/x/tools v0.0.0-20190308142131-b40df0fb21c3/go.mod h1:25r3+/G6/xytQM8iWZKq3Hn0kr0rgFKPUNVEL/dr3z4=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
07070100000015000081A4000003E800000064000000016046124D0000188A000000000000000000000000000000000000001500000000sh-3.2.4/_js/main.gopackage main

import (
	"bytes"
	"fmt"
	"io"
	"math"
	"os"
	"strings"

"github.com/gopherjs/gopherjs/js"

"mvdan.cc/sh/v3/syntax"
)

func main() {
	var exps *js.Object

if js.Module != js.Undefined {
		// node
		exps = js.Module.Get("exports")
	} else {
		// browser, `module.exports` in unavailable
		exps = js.MakeWrapper(map[string]interface{}{})
		originalGlobalSh := js.Global.Get("sh")
		exps.Set("noConflict", func() *js.Object {
			js.Global.Set("sh", originalGlobalSh)
			return exps
		})
		// make it accessable on `window.sh`
		js.Global.Set("sh", exps)
	}

exps.Set("syntax", map[string]interface{}{})

stx := exps.Get("syntax")

// Type helpers just for JS
	stx.Set("NodeType", func(v interface{}) string {
		if v == nil {
			return "nil"
		}
		node, ok := v.(syntax.Node)
		if !ok {
			panic("NodeType requires a Node argument")
		}
		typ := fmt.Sprintf("%T", node)
		if i := strings.LastIndexAny(typ, "*.]"); i >= 0 {
			typ = typ[i+1:]
		}
		return typ
	})

// Parser
	stx.Set("NewParser", func(options ...func(interface{})) *js.Object {
		p := syntax.NewParser()
		jp := js.MakeFullWrapper(&jsParser{Parser: *p})
		// Apply the options after we've wrapped the parser, as
		// otherwise we cannot internalise the value.
		for _, opt := range options {
			opt(jp)
		}
		return jp
	})
	stx.Set("IsIncomplete", syntax.IsIncomplete)

stx.Set("KeepComments", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.KeepComments(enabled)(&v.(*jsParser).Parser)
		}
	})
	stx.Set("Variant", func(l syntax.LangVariant) func(interface{}) {
		if math.IsNaN(float64(l)) {
			panic("Variant requires a LangVariant argument")
		}
		return func(v interface{}) {
			syntax.Variant(l)(&v.(*jsParser).Parser)
		}
	})
	stx.Set("LangBash", syntax.LangBash)
	stx.Set("LangPOSIX", syntax.LangPOSIX)
	stx.Set("LangMirBSDKorn", syntax.LangMirBSDKorn)
	stx.Set("StopAt", func(word string) func(interface{}) {
		return func(v interface{}) {
			syntax.StopAt(word)(&v.(*jsParser).Parser)
		}
	})

// Printer
	stx.Set("NewPrinter", func(options ...func(interface{})) *js.Object {
		p := syntax.NewPrinter()
		jp := js.MakeFullWrapper(&jsPrinter{Printer: *p})
		// Apply the options after we've wrapped the printer, as
		// otherwise we cannot internalise the value.
		for _, opt := range options {
			opt(jp)
		}
		return jp
	})

stx.Set("Indent", func(spaces uint) func(interface{}) {
		return func(v interface{}) {
			syntax.Indent(spaces)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("BinaryNextLine", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.BinaryNextLine(enabled)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("SwitchCaseIndent", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.SwitchCaseIndent(enabled)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("SpaceRedirects", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.SpaceRedirects(enabled)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("KeepPadding", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.KeepPadding(enabled)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("Minify", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.Minify(enabled)(&v.(*jsPrinter).Printer)
		}
	})
	stx.Set("FunctionNextLine", func(enabled bool) func(interface{}) {
		return func(v interface{}) {
			syntax.FunctionNextLine(enabled)(&v.(*jsPrinter).Printer)
		}
	})

// Syntax utilities
	stx.Set("Walk", func(node syntax.Node, jsFn func(*js.Object) bool) {
		fn := func(node syntax.Node) bool {
			if node == nil {
				return jsFn(nil)
			}
			return jsFn(js.MakeFullWrapper(node))
		}
		syntax.Walk(node, fn)
	})
	stx.Set("DebugPrint", func(node syntax.Node) {
		syntax.DebugPrint(os.Stdout, node)
	})
	stx.Set("SplitBraces", func(w *syntax.Word) *js.Object {
		syntax.SplitBraces(w)
		return js.MakeFullWrapper(w)
	})
}

func throw(err error) {
	js.Global.Call("$throw", js.MakeFullWrapper(err))
}

// streamReader is an io.Reader wrapper for Node's stream.Readable. See
// https://nodejs.org/api/stream.html#stream_class_stream_readable
// TODO: support https://streams.spec.whatwg.org/#rs-class too?
type streamReader struct {
	stream *js.Object
}

func (r streamReader) Read(p []byte) (n int, err error) {
	obj := r.stream.Call("read", len(p))
	if obj == nil {
		return 0, io.EOF
	}
	bs := []byte(obj.String())
	return copy(p, bs), nil
}

type jsParser struct {
	syntax.Parser

accumulated []*syntax.Stmt
	incomplete  bytes.Buffer
}

func adaptReader(src *js.Object) io.Reader {
	if src.Get("read") != js.Undefined {
		return streamReader{stream: src}
	}
	return strings.NewReader(src.String())
}

func (p *jsParser) Parse(src *js.Object, name string) *js.Object {
	f, err := p.Parser.Parse(adaptReader(src), name)
	if err != nil {
		throw(err)
	}
	return js.MakeFullWrapper(f)
}

func (p *jsParser) Incomplete() bool {
	return p.Parser.Incomplete()
}

func (p *jsParser) Interactive(src *js.Object, jsFn func([]*js.Object) bool) {
	fn := func(stmts []*syntax.Stmt) bool {
		objs := make([]*js.Object, len(stmts))
		for i, stmt := range stmts {
			objs[i] = js.MakeFullWrapper(stmt)
		}
		return jsFn(objs)
	}
	err := p.Parser.Interactive(adaptReader(src), fn)
	if err != nil {
		throw(err)
	}
}

func (p *jsParser) InteractiveStep(line string) []*syntax.Stmt {
	// pick up previous chunks of the incomplete statement
	r := strings.NewReader(p.incomplete.String() + line)
	lastEnd := uint(0)
	err := p.Parser.Interactive(r, func(stmts []*syntax.Stmt) bool {
		if len(stmts) > 0 {
			// don't re-parse finished statements
			lastEnd = stmts[len(stmts)-1].End().Offset()
		}
		p.accumulated = append(p.accumulated, stmts...)
		return false
	})
	if syntax.IsIncomplete(err) {
		// starting or continuing an incomplete statement
		p.incomplete.WriteString(line[lastEnd:])
		return p.accumulated
	}
	// complete; empty both fields and return
	p.incomplete.Reset()
	if err != nil {
		throw(err)
	}
	acc := p.accumulated
	p.accumulated = p.accumulated[:0]
	return acc
}

type jsPrinter struct {
	syntax.Printer
}

func (p jsPrinter) Print(file *syntax.File) string {
	var buf bytes.Buffer
	if err := p.Printer.Print(&buf, file); err != nil {
		throw(err)
	}
	return buf.String()
}
07070100000016000081A4000003E800000064000000016046124D0000018F000000000000000000000000000000000000001A00000000sh-3.2.4/_js/package.json{
	"name": "mvdan-sh",
	"version": "0.5.0",
	"description": "A shell parser and formatter (POSIX/Bash/mksh)",
	"main": "index.js",
	"repository": "https://github.com/mvdan/sh",
	"author": "Daniel Martí",
	"license": "BSD-3-Clause",
	"files": [
		"README.md",
		"LICENSE",
		"index.js"
	],
	"keywords": [
		"shell",
		"bash",
		"sh",
		"parser",
		"ast",
		"syntax",
		"posix",
		"bash-parser"
	]
}
07070100000017000081A4000003E800000064000000016046124D00000370000000000000000000000000000000000000001E00000000sh-3.2.4/_js/testbrowser.html<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>mvdan-sh</title>
  </head>
  <body>
    <script>
      var sh = "mock-sh";
    </script>
    <script src="./index.js"></script>
    <script>
      const assert = {
        equal(x, y) {
          if (x !== y) {
            throw new Error("assert error");
          }
        },
      };

assert.equal(!sh, false);

const syntax = sh.syntax;
      const parser = syntax.NewParser();
      const printer = syntax.NewPrinter();

const src = "echo      'foo'";
      const f = parser.Parse(src, "src");
      const out = printer.Print(f);
      assert.equal(out, "echo 'foo'\n");

assert.equal(sh, (window.newSh = sh.noConflict()));
      assert.equal(sh, "mock-sh");
    </script>
  </body>
</html>
07070100000018000081A4000003E800000064000000016046124D000015F0000000000000000000000000000000000000001900000000sh-3.2.4/_js/testmain.jsconst assert = require('assert').strict
const stream = require('stream')

const sh = require('./index')

const syntax = sh.syntax
const parser = syntax.NewParser()
const printer = syntax.NewPrinter()

{
	// parsing a simple program
	const src = "echo 'foo'"
	var f = parser.Parse(src, "src")

var stmts = f.Stmts
	assert.equal(f.Stmts.length, 1)

var args = f.Stmts[0].Cmd.Args
	assert.equal(args.length, 2)
	assert.equal(args[0].Parts.length, 1)
	assert.equal(args[0].Parts[0].Value, "echo")
}

{
	// accessing fields or methods creates separate objects
	const src = "echo 'foo'"
	var f = parser.Parse(src, "src")

assert.equal(f.Stmts == f.Stmts, false)
	assert.equal(f.Stmts === f.Stmts, false)
	var stmtsObj = f.Stmts
	assert.equal(stmtsObj == stmtsObj, true)
	assert.equal(stmtsObj === stmtsObj, true)
}

{
	// fatal parse error
	const src = "echo )"
	try {
		parser.Parse(src, "src")
		assert.fail("did not error")
	} catch (err) {
		assert.equal(err.Filename, "src")
		assert.equal(err.Pos.Line(), 1)
		assert.equal(syntax.IsIncomplete(err), false)
	}
}

{
	// incomplete parse error
	const src = "echo ${"
	try {
		parser.Parse(src, "src")
		assert.fail("did not error")
	} catch (err) {
		assert.equal(syntax.IsIncomplete(err), true)
	}
}

{
	// js error from the wrapper layer
	var foo = {}
	try {
		syntax.NodeType(foo)
		assert.fail("did not error")
	} catch (err) {
		assert.equal(err.message.includes("requires a Node argument"), true)
	}
}

{
	// node types, operators, and positions
	const src = "foo || bar"
	var f = parser.Parse(src, "src")

var cmd = f.Stmts[0].Cmd
	assert.equal(syntax.NodeType(cmd), "BinaryCmd")

// TODO: see https://github.com/myitcv/gopherjs/issues/26
	// assert.equal(syntax.String(cmd.Op), "||")

assert.equal(cmd.Pos().String(), "1:1")
	assert.equal(cmd.OpPos.String(), "1:5")
	assert.equal(cmd.OpPos.Line(), 1)
	assert.equal(cmd.OpPos.Col(), 5)
	assert.equal(cmd.OpPos.Offset(), 4)
}

{
	// running Walk
	const src = "foo bar"
	var f = parser.Parse(src, "src")

var nilCount = 0
	var nonNilCount = 0
	var seenBar = false
	var seenCall = false
	syntax.Walk(f, function(node) {
		var typ = syntax.NodeType(node)
		if (node == null) {
			nilCount++
			assert.equal(typ, "nil")
		} else {
			nonNilCount++
			if (node.Value == "bar") {
				seenBar = true
			}
			assert.notEqual(typ, "nil")
		}
		if (typ == "CallExpr") {
			seenCall = true
		}
		return true
	})
	assert.equal(nonNilCount, 7)
	assert.equal(nilCount, 7)
	assert.equal(seenBar, true)
	assert.equal(seenCall, true)
}

{
	// printing
	const src = "echo      'foo'"
	var f = parser.Parse(src, "src")

var out = printer.Print(f)
	assert.equal(out, "echo 'foo'\n")
}

{
	// parser options
	const parser = syntax.NewParser(
		syntax.KeepComments(true),
		syntax.Variant(syntax.LangMirBSDKorn),
		syntax.StopAt("$$")
	)
	const src = "echo ${|stmts;} # bar\n$$"
	var f = parser.Parse(src, "src")

var out = printer.Print(f)
	assert.equal(out, "echo ${|stmts;} # bar\n")
}

{
	// parsing a readable stream
	const src = new stream.Readable
	src.push("echo foo")
	src.push(null)

var f = parser.Parse(src, "src")

var cmd = f.Stmts[0].Cmd
	assert.equal(cmd.Args.length, 2)
}

{
	// using the parser interactively
	const lines = [
		"foo\n",
		"bar; baz\n",
		"\n",
		"foo; 'incom\n",
		" \n",
		"plete'\n",
	]
	const wantCallbacks = [
		{"count": 1, "incomplete": false},
		{"count": 2, "incomplete": false},
		{"count": 0, "incomplete": false},
		{"count": 1, "incomplete": true},
		{"count": 1, "incomplete": true},
		{"count": 2, "incomplete": false},
	]
	var gotCallbacks = []

const src = {"read": function(size) {
		if (lines.length == 0) {
			if (gotCallbacks.length == 0) {
				throw "did not see any callbacks before EOF"
			}
			return null // EOF
		}
		s = lines[0]
		lines.shift()
		return s
	}}

parser.Interactive(src, function(stmts) {
		for (var i in stmts) {
			var stmt = stmts[i]
			assert.equal(syntax.NodeType(stmt), "Stmt")
		}
		gotCallbacks.push({
			"count":      stmts.length,
			"incomplete": parser.Incomplete(),
		})
		return true
	})
	assert.deepEqual(gotCallbacks, wantCallbacks)
}

{
	// using the parser interactively with steps
	const lines = [
		"foo\n",
		"bar; baz\n",
		"\n",
		"foo; 'incom\n",
		" \n",
		"plete'\n",
	]
	const wantResults = [
		{"count": 1, "incomplete": false},
		{"count": 2, "incomplete": false},
		{"count": 0, "incomplete": false},
		{"count": 1, "incomplete": true},
		{"count": 1, "incomplete": true},
		{"count": 2, "incomplete": false},
	]
	var gotResults = []
	for (var i = 0; i < lines.length; i++) {
		var line = lines[i]
		var want = wantResults[i]

var stmts = parser.InteractiveStep(line)
		gotResults.push({
			"count":      stmts.length,
			"incomplete": parser.Incomplete(),
		})
	}
	assert.deepEqual(gotResults, wantResults)
}

{
	// splitting brace expressions
	const parser = syntax.NewParser()
	const src = "{foo,bar}"
	var f = parser.Parse(src, "src")

var word = f.Stmts[0].Cmd.Args[0]
	assert.equal(word.Parts.length, 1)
	assert.equal(syntax.NodeType(word.Parts[0]), "Lit")

word = syntax.SplitBraces(word)
	// TODO: get rid of the empty lit
	assert.equal(word.Parts.length, 2)
	assert.equal(syntax.NodeType(word.Parts[0]), "BraceExp")
	assert.equal(word.Parts[0].Elems.length, 2)
	assert.equal(syntax.NodeType(word.Parts[1]), "Lit")
	assert.equal(word.Parts[1].Value, "")
}

{
	const printer = syntax.NewPrinter(
		syntax.Indent(2),
		syntax.BinaryNextLine(true)
	)
	const f = parser.Parse("RUN yarn install && \\\n yarn build")
	const out = printer.Print(f)
	assert.equal(out, "RUN yarn install \\\n  && yarn build\n")
}
07070100000019000041ED000003E800000064000000046046124D00000000000000000000000000000000000000000000000D00000000sh-3.2.4/cmd0707010000001A000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001200000000sh-3.2.4/cmd/gosh0707010000001B000081A4000003E800000064000000016046124D00000758000000000000000000000000000000000000001A00000000sh-3.2.4/cmd/gosh/main.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package main

import (
	"context"
	"flag"
	"fmt"
	"io"
	"os"
	"strings"

"golang.org/x/term"

"mvdan.cc/sh/v3/interp"
	"mvdan.cc/sh/v3/syntax"
)

var command = flag.String("c", "", "command to be executed")

func main() {
	flag.Parse()
	err := runAll()
	if e, ok := interp.IsExitStatus(err); ok {
		os.Exit(int(e))
	}
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

func runAll() error {
	r, err := interp.New(interp.StdIO(os.Stdin, os.Stdout, os.Stderr))
	if err != nil {
		return err
	}

if *command != "" {
		return run(r, strings.NewReader(*command), "")
	}
	if flag.NArg() == 0 {
		if term.IsTerminal(int(os.Stdin.Fd())) {
			return runInteractive(r, os.Stdin, os.Stdout, os.Stderr)
		}
		return run(r, os.Stdin, "")
	}
	for _, path := range flag.Args() {
		if err := runPath(r, path); err != nil {
			return err
		}
	}
	return nil
}

func run(r *interp.Runner, reader io.Reader, name string) error {
	prog, err := syntax.NewParser().Parse(reader, name)
	if err != nil {
		return err
	}
	r.Reset()
	ctx := context.Background()
	return r.Run(ctx, prog)
}

func runPath(r *interp.Runner, path string) error {
	f, err := os.Open(path)
	if err != nil {
		return err
	}
	defer f.Close()
	return run(r, f, path)
}

func runInteractive(r *interp.Runner, stdin io.Reader, stdout, stderr io.Writer) error {
	parser := syntax.NewParser()
	fmt.Fprintf(stdout, "$ ")
	var runErr error
	fn := func(stmts []*syntax.Stmt) bool {
		if parser.Incomplete() {
			fmt.Fprintf(stdout, "> ")
			return true
		}
		ctx := context.Background()
		for _, stmt := range stmts {
			runErr = r.Run(ctx, stmt)
			if r.Exited() {
				return false
			}
		}
		fmt.Fprintf(stdout, "$ ")
		return true
	}
	if err := parser.Interactive(stdin, fn); err != nil {
		return err
	}
	return runErr
}
0707010000001C000081A4000003E800000064000000016046124D00001092000000000000000000000000000000000000001F00000000sh-3.2.4/cmd/gosh/main_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"testing"

"mvdan.cc/sh/v3/interp"
)

// Each test has an even number of strings, which form input-output pairs for
// the interactive shell. The input string is fed to the interactive shell, and
// bytes are read from its output until the expected output string is matched or
// an error is encountered.
//
// In other words, each first string is what the user types, and each following
// string is what the shell will print back. Note that the first "$ " output is
// implicit.

func TestInteractive(t *testing.T) {
	t.Parallel()
	for i, tc := range interactiveTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			inReader, inWriter := io.Pipe()
			outReader, outWriter := io.Pipe()
			runner, _ := interp.New(interp.StdIO(inReader, outWriter, outWriter))
			errc := make(chan error, 1)
			go func() {
				errc <- runInteractive(runner, inReader, outWriter, outWriter)
				// Discard the rest of the input.
				io.Copy(ioutil.Discard, inReader)
			}()

if err := readString(outReader, "$ "); err != nil {
				t.Fatal(err)
			}

line := 1
			for len(tc.pairs) > 0 {
				if _, err := io.WriteString(inWriter, tc.pairs[0]); err != nil {
					t.Fatal(err)
				}
				if err := readString(outReader, tc.pairs[1]); err != nil {
					t.Fatal(err)
				}

line++
				tc.pairs = tc.pairs[2:]
			}

// Close the input pipe, so that the parser can stop.
			inWriter.Close()

// Once the input pipe is closed, close the output pipe
			// so that any remaining prompt writes get discarded.
			outReader.Close()

err := <-errc
			if err != nil && tc.wantErr == "" {
				t.Fatalf("unexpected error: %v", err)
			} else if tc.wantErr != "" && fmt.Sprint(err) != tc.wantErr {
				t.Fatalf("want error %q, got: %v", tc.wantErr, err)
			}
		})
	}
}

func TestInteractiveExit(t *testing.T) {
	inReader, inWriter := io.Pipe()
	defer inReader.Close()
	go io.WriteString(inWriter, "exit\n")
	w := ioutil.Discard
	runner, _ := interp.New(interp.StdIO(inReader, w, w))
	if err := runInteractive(runner, inReader, w, w); err != nil {
		t.Fatal("expected a nil error")
	}
}

// readString will keep reading from a reader until all bytes from the supplied
// string are read.
func readString(r io.Reader, want string) error {
	p := make([]byte, len(want))
	_, err := io.ReadFull(r, p)
	if err != nil {
		return err
	}
	got := string(p)
	if got != want {
		return fmt.Errorf("ReadString: read %q, wanted %q", got, want)
	}
	return nil
}
0707010000001D000041ED000003E800000064000000036046124D00000000000000000000000000000000000000000000001300000000sh-3.2.4/cmd/shfmt0707010000001E000081A4000003E800000064000000016046124D000001BF000000000000000000000000000000000000001E00000000sh-3.2.4/cmd/shfmt/DockerfileFROM golang:1.16-alpine AS build

WORKDIR /src
RUN apk add --no-cache git
COPY . .
RUN CGO_ENABLED=0 go build -ldflags "-w -s -extldflags '-static' -X main.version=$(git describe --always --dirty --tags)" ./cmd/shfmt

FROM alpine:3.13.2 AS alpine
COPY --from=build /src/shfmt /bin/shfmt
COPY "./cmd/shfmt/docker-entrypoint.sh" "/init"
ENTRYPOINT ["/init"]

FROM scratch
COPY --from=build /src/shfmt /bin/shfmt
ENTRYPOINT ["/bin/shfmt"]
CMD ["-h"]
0707010000001F000081ED000003E800000064000000016046124D00000235000000000000000000000000000000000000002800000000sh-3.2.4/cmd/shfmt/docker-entrypoint.sh#!/bin/sh
# SPDX-License-Identifier: BSD-3-Clause
#
# Copyright (C) 2019 Olliver Schinagl <oliver@schinagl.nl>
#
# A beginning user should be able to docker run image bash (or sh) without
# needing to learn about --entrypoint
# https://github.com/docker-library/official-images#consistency

set -eu

# run command if it is not starting with a "-" and is an executable in PATH
if [ "${#}" -gt 0 ] && \
   [ "${1#-}" = "${1}" ] && \
   command -v "${1}" > "/dev/null" 2>&1; then
	exec "${@}"
else
	# else default to run the command
	exec /bin/shfmt "${@}"
fi

exit 0
07070100000020000081A4000003E800000064000000016046124D00000719000000000000000000000000000000000000001B00000000sh-3.2.4/cmd/shfmt/json.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package main

import (
	"encoding/json"
	"go/ast"
	"io"
	"reflect"

"mvdan.cc/sh/v3/syntax"
)

func writeJSON(w io.Writer, node syntax.Node, pretty bool) error {
	val := reflect.ValueOf(node)
	v, _ := encode(val)
	enc := json.NewEncoder(w)
	if pretty {
		enc.SetIndent("", "\t")
	}
	return enc.Encode(v)
}

func encode(val reflect.Value) (interface{}, string) {
	switch val.Kind() {
	case reflect.Ptr:
		elem := val.Elem()
		if !elem.IsValid() {
			return nil, ""
		}
		return encode(elem)
	case reflect.Interface:
		if val.IsNil() {
			return nil, ""
		}
		v, tname := encode(val.Elem())
		m := v.(map[string]interface{})
		m["Type"] = tname
		return m, ""
	case reflect.Struct:
		m := make(map[string]interface{}, val.NumField()+1)
		typ := val.Type()
		for i := 0; i < val.NumField(); i++ {
			ftyp := typ.Field(i)
			if ftyp.Type.Name() == "Pos" {
				continue
			}
			if !ast.IsExported(ftyp.Name) {
				continue
			}
			fval := val.Field(i)
			v, _ := encode(fval)
			m[ftyp.Name] = v
		}
		// Pos methods are defined on struct pointer receivers.
		for _, name := range [...]string{"Pos", "End"} {
			if fn := val.Addr().MethodByName(name); fn.IsValid() {
				m[name] = translatePos(fn.Call(nil)[0])
			}
		}
		return m, typ.Name()
	case reflect.Slice:
		l := make([]interface{}, val.Len())
		for i := 0; i < val.Len(); i++ {
			elem := val.Index(i)
			l[i], _ = encode(elem)
		}
		return l, ""
	default:
		return val.Interface(), ""
	}
}

func translatePos(val reflect.Value) map[string]interface{} {
	return map[string]interface{}{
		"Offset": val.MethodByName("Offset").Call(nil)[0].Uint(),
		"Line":   val.MethodByName("Line").Call(nil)[0].Uint(),
		"Col":    val.MethodByName("Col").Call(nil)[0].Uint(),
	}
}
07070100000021000081A4000003E800000064000000016046124D0000250E000000000000000000000000000000000000001B00000000sh-3.2.4/cmd/shfmt/main.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package main

import (
	"bytes"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"regexp"
	"runtime"
	"runtime/debug"

"github.com/google/renameio"
	"github.com/pkg/diff"
	diffwrite "github.com/pkg/diff/write"
	"golang.org/x/term"
	"mvdan.cc/editorconfig"

"mvdan.cc/sh/v3/fileutil"
	"mvdan.cc/sh/v3/syntax"
)

const unsetLang = syntax.LangVariant(-1)

var (
	showVersion = flag.Bool("version", false, "")

list    = flag.Bool("l", false, "")
	write   = flag.Bool("w", false, "")
	simple  = flag.Bool("s", false, "")
	minify  = flag.Bool("mn", false, "")
	find    = flag.Bool("f", false, "")
	diffOut = flag.Bool("d", false, "")

// useEditorConfig will be false if any parser or printer flags were used.
	useEditorConfig = true

lang     = unsetLang
	posix    = flag.Bool("p", false, "")
	filename = flag.String("filename", "", "")

indent      = flag.Uint("i", 0, "")
	binNext     = flag.Bool("bn", false, "")
	caseIndent  = flag.Bool("ci", false, "")
	spaceRedirs = flag.Bool("sr", false, "")
	keepPadding = flag.Bool("kp", false, "")
	funcNext    = flag.Bool("fn", false, "")

toJSON = flag.Bool("tojson", false, "")

parser            *syntax.Parser
	printer           *syntax.Printer
	readBuf, writeBuf bytes.Buffer

copyBuf = make([]byte, 32*1024)

in    io.Reader = os.Stdin
	out   io.Writer = os.Stdout
	color bool

version = "(devel)" // to match the default from runtime/debug
)

func init() { flag.Var(&lang, "ln", "") }

func main() {
	os.Exit(main1())
}

func main1() int {
	flag.Usage = func() {
		fmt.Fprint(os.Stderr, `usage: shfmt [flags] [path ...]

shfmt formats shell programs. If the only argument is a dash ('-') or no
arguments are given, standard input will be used. If a given path is a
directory, all shell scripts found under that directory will be used.

-version  show version and exit

-l        list files whose formatting differs from shfmt's
  -w        write result to file instead of stdout
  -d        error with a diff when the formatting differs
  -s        simplify the code
  -mn       minify the code to reduce its size (implies -s)

Parser options:

-ln str        language variant to parse (bash/posix/mksh/bats, default "bash")
  -p             shorthand for -ln=posix
  -filename str  provide a name for the standard input file

Printer options:

-i uint   indent: 0 for tabs (default), >0 for number of spaces
  -bn       binary ops like && and | may start a line
  -ci       switch cases will be indented
  -sr       redirect operators will be followed by a space
  -kp       keep column alignment paddings
  -fn       function opening braces are placed on a separate line

Utilities:

-f        recursively find all shell files and print the paths
  -tojson   print syntax tree to stdout as a typed JSON

For more information, see 'man shfmt' and https://github.com/mvdan/sh.
`)
	}
	flag.Parse()

if *showVersion {
		// don't overwrite the version if it was set by -ldflags=-X
		if info, ok := debug.ReadBuildInfo(); ok && version == "(devel)" {
			mod := &info.Main
			if mod.Replace != nil {
				mod = mod.Replace
			}
			version = mod.Version
		}
		fmt.Println(version)
		return 0
	}
	if *posix && lang != unsetLang {
		fmt.Fprintf(os.Stderr, "-p and -ln=lang cannot coexist\n")
		return 1
	}
	if *minify {
		*simple = true
	}
	if os.Getenv("SHFMT_NO_EDITORCONFIG") == "true" {
		useEditorConfig = false
	}
	flag.Visit(func(f *flag.Flag) {
		switch f.Name {
		case "ln", "p", "i", "bn", "ci", "sr", "kp", "fn":
			useEditorConfig = false
		}
	})
	parser = syntax.NewParser(syntax.KeepComments(true))
	printer = syntax.NewPrinter(syntax.Minify(*minify))

if !useEditorConfig {
		if *posix {
			// -p equals -ln=posix
			lang = syntax.LangPOSIX
		} else if lang == unsetLang {
			// if unset, default to -ln=bash
			lang = syntax.LangBash
		}
		syntax.Variant(lang)(parser)

syntax.Indent(*indent)(printer)
		syntax.BinaryNextLine(*binNext)(printer)
		syntax.SwitchCaseIndent(*caseIndent)(printer)
		syntax.SpaceRedirects(*spaceRedirs)(printer)
		syntax.KeepPadding(*keepPadding)(printer)
		syntax.FunctionNextLine(*funcNext)(printer)
	}

if os.Getenv("FORCE_COLOR") == "true" {
		// Undocumented way to force color; used in the tests.
		color = true
	} else if os.Getenv("TERM") == "dumb" {
		// Equivalent to forcing color to be turned off.
	} else if f, ok := out.(*os.File); ok && term.IsTerminal(int(f.Fd())) {
		color = true
	}
	if flag.NArg() == 0 || (flag.NArg() == 1 && flag.Arg(0) == "-") {
		name := "<standard input>"
		if *filename != "" {
			name = *filename
		}
		if err := formatStdin(name); err != nil {
			if err != errChangedWithDiff {
				fmt.Fprintln(os.Stderr, err)
			}
			return 1
		}
		return 0
	}
	if *filename != "" {
		fmt.Fprintln(os.Stderr, "-filename can only be used with stdin")
		return 1
	}
	if *toJSON {
		fmt.Fprintln(os.Stderr, "-tojson can only be used with stdin")
		return 1
	}
	status := 0
	for _, path := range flag.Args() {
		if info, err := os.Stat(path); err == nil && !info.IsDir() && !*find {
			// When given paths to files directly, always format
			// them, no matter their extension or shebang.
			//
			// The only exception is the -f flag; in that case, we
			// do want to report whether the file is a shell script.
			if err := formatPath(path, false); err != nil {
				fmt.Fprintln(os.Stderr, err)
				status = 1
			}
			continue
		}
		if err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
			if err != nil {
				return err
			}
			switch err := walkPath(path, info); err {
			case nil:
			case filepath.SkipDir:
				return err
			case errChangedWithDiff:
				status = 1
			default:
				fmt.Fprintln(os.Stderr, err)
				status = 1
			}
			return nil
		}); err != nil {
			fmt.Fprintln(os.Stderr, err)
			status = 1
		}
	}
	return status
}

var errChangedWithDiff = fmt.Errorf("")

func formatStdin(name string) error {
	if *write {
		return fmt.Errorf("-w cannot be used on standard input")
	}
	src, err := ioutil.ReadAll(in)
	if err != nil {
		return err
	}
	return formatBytes(src, name)
}

var vcsDir = regexp.MustCompile(`^\.(git|svn|hg)$`)

func walkPath(path string, info os.FileInfo) error {
	if info.IsDir() && vcsDir.MatchString(info.Name()) {
		return filepath.SkipDir
	}
	if useEditorConfig {
		props, err := ecQuery.Find(path)
		if err != nil {
			return err
		}
		if props.Get("ignore") == "true" {
			if info.IsDir() {
				return filepath.SkipDir
			} else {
				return nil
			}
		}
	}
	conf := fileutil.CouldBeScript(info)
	if conf == fileutil.ConfNotScript {
		return nil
	}
	err := formatPath(path, conf == fileutil.ConfIfShebang)
	if err != nil && !os.IsNotExist(err) {
		return err
	}
	return nil
}

var ecQuery = editorconfig.Query{
	FileCache:   make(map[string]*editorconfig.File),
	RegexpCache: make(map[string]*regexp.Regexp),
}

func propsOptions(props editorconfig.Section) {
	lang := syntax.LangBash
	lang.Set(props.Get("shell_variant"))
	syntax.Variant(lang)(parser)

size := uint(0)
	if props.Get("indent_style") == "space" {
		size = 8
		if n := props.IndentSize(); n > 0 {
			size = uint(n)
		}
	}
	syntax.Indent(size)(printer)

syntax.BinaryNextLine(props.Get("binary_next_line") == "true")(printer)
	syntax.SwitchCaseIndent(props.Get("switch_case_indent") == "true")(printer)
	syntax.SpaceRedirects(props.Get("space_redirects") == "true")(printer)
	syntax.KeepPadding(props.Get("keep_padding") == "true")(printer)
	syntax.FunctionNextLine(props.Get("function_next_line") == "true")(printer)
}

func formatPath(path string, checkShebang bool) error {
	f, err := os.Open(path)
	if err != nil {
		return err
	}
	defer f.Close()
	readBuf.Reset()
	if checkShebang {
		n, err := f.Read(copyBuf[:32])
		if err != nil {
			return err
		}
		if !fileutil.HasShebang(copyBuf[:n]) {
			return nil
		}
		readBuf.Write(copyBuf[:n])
	}
	if *find {
		fmt.Fprintln(out, path)
		return nil
	}
	if _, err := io.CopyBuffer(&readBuf, f, copyBuf); err != nil {
		return err
	}
	f.Close()
	return formatBytes(readBuf.Bytes(), path)
}

func formatBytes(src []byte, path string) error {
	if useEditorConfig {
		props, err := ecQuery.Find(path)
		if err != nil {
			return err
		}
		propsOptions(props)
	}
	prog, err := parser.Parse(bytes.NewReader(src), path)
	if err != nil {
		return err
	}
	if *simple {
		syntax.Simplify(prog)
	}
	if *toJSON {
		// must be standard input; fine to return
		return writeJSON(out, prog, true)
	}
	writeBuf.Reset()
	printer.Print(&writeBuf, prog)
	res := writeBuf.Bytes()
	if !bytes.Equal(src, res) {
		if *list {
			if _, err := fmt.Fprintln(out, path); err != nil {
				return err
			}
		}
		if *write {
			info, err := os.Lstat(path)
			if err != nil {
				return err
			}
			perm := info.Mode().Perm()
			writeFile := renameio.WriteFile
			// TODO: support atomic writes on Windows once renameio
			// supports it
			if runtime.GOOS == "windows" {
				writeFile = ioutil.WriteFile
			}
			if err := writeFile(path, res, perm); err != nil {
				return err
			}
		}
		if *diffOut {
			opts := []diffwrite.Option{}
			if color {
				opts = append(opts, diffwrite.TerminalColor())
			}
			if err := diff.Text(path+".orig", path, src, res, out, opts...); err != nil {
				return fmt.Errorf("computing diff: %s", err)
			}
			return errChangedWithDiff
		}
	}
	if !*list && !*write && !*diffOut {
		if _, err := out.Write(res); err != nil {
			return err
		}
	}
	return nil
}
07070100000022000081A4000003E800000064000000016046124D0000045A000000000000000000000000000000000000002000000000sh-3.2.4/cmd/shfmt/main_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"testing"

"github.com/rogpeppe/go-internal/testscript"
)

func TestMain(m *testing.M) {
	os.Exit(testscript.RunMain(m, map[string]func() int{
		"shfmt": main1,
	}))
}

var update = flag.Bool("u", false, "update testscript output files")

func TestScripts(t *testing.T) {
	t.Parallel()
	testscript.Run(t, testscript.Params{
		Dir: filepath.Join("testdata", "scripts"),
		Setup: func(env *testscript.Env) error {
			bindir := filepath.Join(env.WorkDir, ".bin")
			if err := os.Mkdir(bindir, 0o777); err != nil {
				return err
			}
			binfile := filepath.Join(bindir, "bundled-shfmt")
			if runtime.GOOS == "windows" {
				binfile += ".exe"
			}
			if err := os.Symlink(os.Args[0], binfile); err != nil {
				return err
			}
			env.Vars = append(env.Vars, fmt.Sprintf("PATH=%s%c%s", bindir, filepath.ListSeparator, os.Getenv("PATH")))
			env.Vars = append(env.Vars, "TESTSCRIPT_COMMAND=shfmt")
			return nil
		},
		UpdateScripts: *update,
	})
}
07070100000023000081A4000003E800000064000000016046124D00000C01000000000000000000000000000000000000001F00000000sh-3.2.4/cmd/shfmt/shfmt.1.scdshfmt(1)

# NAME

shfmt - Format shell programs

# SYNOPSIS

*shfmt* [flags] [path...]

# DESCRIPTION

shfmt formats shell programs. If the only argument is a dash (*-*) or no
arguments are given, standard input will be used. If a given path is a
directory, all shell scripts found under that directory will be used.

If any EditorConfig files are found, they will be used to apply formatting
options. If any parser or printer flags are given to the tool, no EditorConfig
files will be used. A default like *-i=0* can be used for this purpose.

shfmt's default shell formatting was chosen to be consistent, common, and
predictable. Some aspects of the format can be configured via printer flags.

# OPTIONS

## Generic flags

*-version*
	Show version and exit.

*-l*
	List files whose formatting differs from shfmt's.

*-w*
	Write result to file instead of stdout.

*-d*
	Error with a diff when the formatting differs.

*-s*
	Simplify the code.

*-mn*
	Minify the code to reduce its size (implies -s).

## Parser flags

*-ln* <str>
	Language variant to parse (bash/posix/mksh/bats, default "bash").

*-p*
	Shorthand for -ln=posix.

*-filename* str
	Provide a name for the standard input file.

## Printer flags

*-i* <uint>
	Indent: 0 for tabs (default), >0 for number of spaces.

*-bn*
	Binary ops like && and | may start a line.

*-ci*
	Switch cases will be indented.

*-sr*
	Redirect operators will be followed by a space.

*-kp*
	Keep column alignment paddings.

*-fn*
	Function opening braces are placed on a separate line.

## Utility flags

*-f*
	Recursively find all shell files and print the paths.

*-tojson*
	Print syntax tree to stdout as a typed JSON.

# EXAMPLES

Format all the scripts under the current directory, printing which are modified:

shfmt -l -w .

For CI, one can use a variant where formatting changes are just shown as diffs:

shfmt -d .

The following formatting flags closely resemble Google's shell style defined in
<https://google.github.io/styleguide/shell.xml>:

shfmt -i 2 -ci

Below is a sample EditorConfig file as defined by <https://editorconfig.org/>,
showing how to set any option:

```
[*.sh]
# like -i=4
indent_style = space
indent_size = 4

shell_variant      = posix # like -ln=posix
binary_next_line   = true  # like -bn
switch_case_indent = true  # like -ci
space_redirects    = true  # like -sr
keep_padding       = true  # like -kp
function_next_line = true  # like -fn

# Ignore the entire "third_party" directory.
[third_party/**]
ignore = true
```

shfmt can also replace *bash -n* to check shell scripts for syntax errors. It is
more exhaustive, as it parses all syntax statically and requires valid UTF-8:

```
$ echo '${foo:1 2}' | bash -n
$ echo '${foo:1 2}' | shfmt >/dev/null
1:9: not a valid arithmetic operator: 2
$ echo 'foo=(1 2)' | bash --posix -n
$ echo 'foo=(1 2)' | shfmt -p >/dev/null
1:5: arrays are a bash feature
```

# AUTHORS

Maintained by Daniel Martí <mvdan@mvdan.cc>, who is assisted by other open
source contributors. For more information and development, see
<https://github.com/mvdan/sh>.
07070100000024000041ED000003E800000064000000036046124D00000000000000000000000000000000000000000000001C00000000sh-3.2.4/cmd/shfmt/testdata07070100000025000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000002400000000sh-3.2.4/cmd/shfmt/testdata/scripts07070100000026000081A4000003E800000064000000016046124D00000229000000000000000000000000000000000000002F00000000sh-3.2.4/cmd/shfmt/testdata/scripts/atomic.txt[windows] skip 'atomic writes aren''t supported on Windows'
[!exec:sh] skip 'sh is required to run this test'

# If we don't do atomic writes, most shells will error when shfmt overwrites the
# very script it's running from. This is because the shell doesn't read all of
# the input script upfront.
exec sh input.sh
cmp stdout stdout.golden
! stderr .

cmp input.sh input.sh.golden

-- input.sh --
echo foo
  bundled-shfmt -l -w input.sh
echo bar
-- input.sh.golden --
echo foo
bundled-shfmt -l -w input.sh
echo bar
-- stdout.golden --
foo
input.sh
bar
07070100000027000081A4000003E800000064000000016046124D000001E7000000000000000000000000000000000000002E00000000sh-3.2.4/cmd/shfmt/testdata/scripts/basic.txtcp input.sh input.sh.orig

stdin input.sh
shfmt
cmp stdout input.sh.golden
! stderr .

stdin input.sh
shfmt -
cmp stdout input.sh.golden
! stderr .

shfmt input.sh
cmp stdout input.sh.golden
! stderr .

shfmt -l input.sh
stdout 'input\.sh'
! stdout foo
! stderr .
cmp input.sh input.sh.orig

shfmt -l input.sh input.sh
stdout -count=2 'input.sh'

shfmt -l -w input.sh
stdout 'input\.sh'
! stdout foo
! stderr .
cmp input.sh input.sh.golden

-- input.sh --
 foo
-- input.sh.golden --
foo
07070100000028000081A4000003E800000064000000016046124D00000212000000000000000000000000000000000000002D00000000sh-3.2.4/cmd/shfmt/testdata/scripts/diff.txtstdin input.sh
! shfmt -d
cmp stdout input.sh.stdindiff
! stderr .

! shfmt -d input.sh
cmp stdout input.sh.filediff
! stderr .

! shfmt -d input.sh input.sh
stdout -count=2 'input.sh.orig'

env FORCE_COLOR=true
stdin input.sh
! shfmt -d
stdout '\x1b\[31m- foo'
! stderr .

-- input.sh --
 foo

bar
-- input.sh.golden --
foo

bar
-- input.sh.stdindiff --
--- <standard input>.orig
+++ <standard input>
@@ -1,4 +1,3 @@
- foo
+foo
 
-
 bar
-- input.sh.filediff --
--- input.sh.orig
+++ input.sh
@@ -1,4 +1,3 @@
- foo
+foo
 
-
 bar
07070100000029000081A4000003E800000064000000016046124D00000A3C000000000000000000000000000000000000003500000000sh-3.2.4/cmd/shfmt/testdata/scripts/editorconfig.txtcp input.sh input.sh.orig

# Using stdin should use EditorConfig.
stdin input.sh
shfmt
cmp stdout input.sh.golden
! stderr .

# Verify that -filename works well with EditorConfig.
stdin stdin-filename-bash
shfmt

stdin stdin-filename-bash
! shfmt -filename=foo-posix.sh
stderr '^foo-posix.sh:.* arrays are a bash'

# Using a file path should use EditorConfig, including with the use of flags
# like -l.
shfmt input.sh
cmp stdout input.sh.golden
! stderr .

shfmt -l input.sh
stdout 'input\.sh'
! stderr .

# Using any formatting option should skip all EditorConfig usage.
shfmt -p input.sh
cmp stdout input.sh.orig
! stderr .

shfmt -l -p input.sh
! stdout .
! stderr .

shfmt -sr input.sh
cmp stdout input.sh.orig
! stderr .

# Check that EditorConfig files merge properly.
shfmt morespaces/input.sh
cmp stdout morespaces/input.sh.golden
! stderr .

# Check a folder with all other knobs.
shfmt -l otherknobs
! stdout .
! stderr .

# Ignore directories when walking, if they match ignore=true.
shfmt -l ignored
stdout 'regular\.sh'
! stdout 'ignored\.sh'
! stderr .

-- .editorconfig --
root = true

[*]
indent_style = space
indent_size = 3

[*-posix.sh]
shell_variant = posix
-- input.sh --
{
	indented
}
-- input.sh.golden --
{
   indented
}
-- stdin-filename-bash --
array=(
	element
)
-- morespaces/.editorconfig --
[*.sh]
indent_size = 6
-- morespaces/input.sh --
{
	indented
}
-- morespaces/input.sh.golden --
{
      indented
}
-- otherknobs/.editorconfig --
root = true

[shell_variant_posix.sh]
shell_variant = posix

[shell_variant_mksh.sh]
shell_variant = mksh

[indent.sh]
# check its default; we tested "space" above.

[binary_next_line.sh]
binary_next_line = true

[switch_case_indent.sh]
switch_case_indent = true

[space_redirects.sh]
space_redirects = true

[keep_padding.sh]
keep_padding = true

[function_next_line.sh]
function_next_line = true

-- otherknobs/shell_variant_posix.sh --
let badsyntax+
-- otherknobs/shell_variant_mksh.sh --
coproess |&
-- otherknobs/indent.sh --
{
	indented
}
-- otherknobs/binary_next_line.sh --
foo \
	| bar
-- otherknobs/switch_case_indent.sh --
case "$1" in
	A) echo foo ;;
esac
-- otherknobs/space_redirects.sh --
echo foo > bar
-- otherknobs/keep_padding.sh --
echo  foo    bar
-- otherknobs/function_next_line.sh --
foo()
{
	echo foo
}
-- ignored/.editorconfig --
root = true

[third_party/**]
ignore = true

[1_lone_ignored.sh]
ignore = true

[2_dir_ignored]
ignore = true

-- ignored/third_party/ignored.sh --
bad (syntax
-- ignored/1_lone_ignored.sh
echo   foo
-- ignored/2_dir_ignored/ignored.sh --
echo   foo
-- ignored/3_regular/regular.sh --
echo   foo
0707010000002A000081A4000003E800000064000000016046124D00000546000000000000000000000000000000000000002E00000000sh-3.2.4/cmd/shfmt/testdata/scripts/flags.txt# https://github.com/rogpeppe/go-internal/issues/93
# ! shfmt -h
# ! stderr 'flag provided but not defined'
# stderr 'usage: shfmt'
# stderr 'Utilities' # definitely includes our help text
# ! stderr 'help requested' # don't duplicate usage output
# ! stderr '-test\.' # don't show the test binary's usage func

shfmt -version
stdout 'devel|v3'
! stderr .

! shfmt -ln=bash -p
stderr 'cannot coexist'

! shfmt -ln=bad
stderr 'unknown shell language'

! shfmt -tojson file
stderr '-tojson can only be used with stdin'

! shfmt -filename=foo file
stderr '-filename can only be used with stdin'

# Check all the -ln variations.

stdin input-posix
! shfmt

stdin input-posix
shfmt -ln=posix
stdout 'let'

stdin input-posix
shfmt -p
stdout 'let'

stdin input-posix
! shfmt -ln=mksh

stdin input-posix
! shfmt -ln=bash

stdin input-mksh
shfmt -ln=mksh
stdout 'coprocess'

stdin input-mksh
! shfmt

# Ensure that the default "bash" language works with and without flags.
stdin input-bash
shfmt
stdout loop

stdin input-bash
shfmt -i 4
stdout loop

# TODO: introduce stdin lang detection
#stdin -filename=input.mksh input-mksh
#shfmt
#stdout 'coprocess'
#
#stdin input-mksh-shebang
#shfmt
#stdout 'coprocess'

-- input-posix --
let a+
-- input-bash --
for ((;;)); do loop; done
-- input-mksh --
coprocess |&
-- input-mksh-shebang --
#!/bin/mksh
coprocess |&
0707010000002B000081A4000003E800000064000000016046124D00000BD4000000000000000000000000000000000000002F00000000sh-3.2.4/cmd/shfmt/testdata/scripts/tojson.txtstdin empty.sh
shfmt -tojson
cmp stdout empty.sh.json
! stderr .

stdin simple.sh
shfmt -tojson
cmp stdout simple.sh.json

stdin arithmetic.sh
shfmt -tojson
cmp stdout arithmetic.sh.json

stdin comment.sh
shfmt -tojson
cmp stdout comment.sh.json

-- empty.sh --
-- empty.sh.json --
{
	"End": {
		"Col": 0,
		"Line": 0,
		"Offset": 0
	},
	"Last": [],
	"Name": "\u003cstandard input\u003e",
	"Pos": {
		"Col": 0,
		"Line": 0,
		"Offset": 0
	},
	"Stmts": []
}
-- simple.sh --
foo
-- simple.sh.json --
{
	"End": {
		"Col": 4,
		"Line": 1,
		"Offset": 3
	},
	"Last": [],
	"Name": "\u003cstandard input\u003e",
	"Pos": {
		"Col": 1,
		"Line": 1,
		"Offset": 0
	},
	"Stmts": [
		{
			"Background": false,
			"Cmd": {
				"Args": [
					{
						"End": {
							"Col": 4,
							"Line": 1,
							"Offset": 3
						},
						"Parts": [
							{
								"End": {
									"Col": 4,
									"Line": 1,
									"Offset": 3
								},
								"Pos": {
									"Col": 1,
									"Line": 1,
									"Offset": 0
								},
								"Type": "Lit",
								"Value": "foo"
							}
						],
						"Pos": {
							"Col": 1,
							"Line": 1,
							"Offset": 0
						}
					}
				],
				"Assigns": [],
				"End": {
					"Col": 4,
					"Line": 1,
					"Offset": 3
				},
				"Pos": {
					"Col": 1,
					"Line": 1,
					"Offset": 0
				},
				"Type": "CallExpr"
			},
			"Comments": [],
			"Coprocess": false,
			"End": {
				"Col": 4,
				"Line": 1,
				"Offset": 3
			},
			"Negated": false,
			"Pos": {
				"Col": 1,
				"Line": 1,
				"Offset": 0
			},
			"Redirs": []
		}
	]
}
-- arithmetic.sh --
((2))
-- arithmetic.sh.json --
{
	"End": {
		"Col": 6,
		"Line": 1,
		"Offset": 5
	},
	"Last": [],
	"Name": "\u003cstandard input\u003e",
	"Pos": {
		"Col": 1,
		"Line": 1,
		"Offset": 0
	},
	"Stmts": [
		{
			"Background": false,
			"Cmd": {
				"End": {
					"Col": 6,
					"Line": 1,
					"Offset": 5
				},
				"Pos": {
					"Col": 1,
					"Line": 1,
					"Offset": 0
				},
				"Type": "ArithmCmd",
				"Unsigned": false,
				"X": {
					"End": {
						"Col": 4,
						"Line": 1,
						"Offset": 3
					},
					"Parts": [
						{
							"End": {
								"Col": 4,
								"Line": 1,
								"Offset": 3
							},
							"Pos": {
								"Col": 3,
								"Line": 1,
								"Offset": 2
							},
							"Type": "Lit",
							"Value": "2"
						}
					],
					"Pos": {
						"Col": 3,
						"Line": 1,
						"Offset": 2
					},
					"Type": "Word"
				}
			},
			"Comments": [],
			"Coprocess": false,
			"End": {
				"Col": 6,
				"Line": 1,
				"Offset": 5
			},
			"Negated": false,
			"Pos": {
				"Col": 1,
				"Line": 1,
				"Offset": 0
			},
			"Redirs": []
		}
	]
}
-- comment.sh --
#
-- comment.sh.json --
{
	"End": {
		"Col": 2,
		"Line": 1,
		"Offset": 1
	},
	"Last": [
		{
			"End": {
				"Col": 2,
				"Line": 1,
				"Offset": 1
			},
			"Pos": {
				"Col": 1,
				"Line": 1,
				"Offset": 0
			},
			"Text": ""
		}
	],
	"Name": "\u003cstandard input\u003e",
	"Pos": {
		"Col": 1,
		"Line": 1,
		"Offset": 0
	},
	"Stmts": []
}
0707010000002C000081A4000003E800000064000000016046124D00000A16000000000000000000000000000000000000002D00000000sh-3.2.4/cmd/shfmt/testdata/scripts/walk.txtmkdir symlink/reallylongdir
[symlink] symlink symlink/reallylongdir/symlink-file -> modify/ext-shebang.sh
[symlink] symlink symlink/symlink-dir -> symlink/reallylongdir
[symlink] symlink symlink/symlink-none -> symlink/reallylongdir/nonexistent

shfmt -f .
cmpenv stdout find.golden
! stderr .

# try to format missing paths
! shfmt nonexistent
stderr -count=1 nonexistent

! shfmt nonexistent-1 nonexistent-2 nonexistent-3
stderr -count=1 nonexistent-1
stderr -count=1 nonexistent-2
stderr -count=1 nonexistent-3

# format an entire directory without -l or -w
! shfmt .
stdout 'foo'
stdout 'bin/env'
stderr 'parse-error\.sh'

# format an entire directory with -l and -w
! shfmt -l -w .
cmpenv stdout modify.golden
stderr 'parse-error\.sh'

# format files directly which we would ignore when walking directories
shfmt none/ext-shebang.other
stdout 'foo'
shfmt none/noext-noshebang
stdout 'foo'

# -f on files should still check extension and shebang
shfmt -f modify/ext.sh modify/shebang-1 none/ext-shebang.other none/noext-noshebang
stdout -count=2 '^modify'
! stdout '^none'

-- find.golden --
error${/}parse-error.sh
modify${/}dir${/}ext.sh
modify${/}ext-shebang.sh
modify${/}ext.bash
modify${/}ext.sh
modify${/}shebang-1
modify${/}shebang-2
modify${/}shebang-3
modify${/}shebang-4
modify${/}shebang-5
modify${/}shebang-args
modify${/}shebang-space
modify${/}shebang-tabs
-- modify.golden --
modify${/}dir${/}ext.sh
modify${/}ext-shebang.sh
modify${/}ext.bash
modify${/}ext.sh
modify${/}shebang-1
modify${/}shebang-2
modify${/}shebang-3
modify${/}shebang-4
modify${/}shebang-5
modify${/}shebang-args
modify${/}shebang-space
modify${/}shebang-tabs
-- modify/shebang-1 --
#!/bin/sh
 foo
-- modify/shebang-2 --
#!/bin/bash
 foo
-- modify/shebang-3 --
#!/usr/bin/sh
 foo
-- modify/shebang-4 --
#!/usr/bin/env bash
 foo
-- modify/shebang-5 --
#!/bin/env sh
 foo
-- modify/shebang-space --
#! /bin/sh
 foo
-- modify/shebang-tabs --
#!	/bin/env	sh
 foo
-- modify/shebang-args --
#!/bin/bash -e -x
 foo
-- modify/ext.sh --
 foo
-- modify/ext.bash --
 foo
-- modify/ext-shebang.sh --
#!/bin/sh
 foo
-- modify/dir/ext.sh --
foo

-- none/.hidden --
foo long enough
-- none/.hidden-shebang --
#!/bin/sh
 foo
-- none/..hidden-shebang --
#!/bin/sh
 foo
-- none/noext-empty --
foo
-- none/noext-noshebang --
foo long enough
-- none/shebang-nonewline --
#!/bin/shfoo
-- none/ext.other --
foo
-- none/ext-shebang.other --
#!/bin/sh
 foo
-- none/shebang-nospace --
#!/bin/envsh
 foo

-- skip/.git/ext.sh --
foo
-- skip/.svn/ext.sh --
foo
-- skip/.hg/ext.sh --
foo

-- error/parse-error.sh --
foo(
0707010000002D000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001000000000sh-3.2.4/expand0707010000002E000081A4000003E800000064000000016046124D00000FB8000000000000000000000000000000000000001900000000sh-3.2.4/expand/arith.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"fmt"
	"strconv"

"mvdan.cc/sh/v3/syntax"
)

func Arithm(cfg *Config, expr syntax.ArithmExpr) (int, error) {
	switch x := expr.(type) {
	case *syntax.Word:
		str, err := Literal(cfg, x)
		if err != nil {
			return 0, err
		}
		// recursively fetch vars
		i := 0
		for syntax.ValidName(str) {
			val := cfg.envGet(str)
			if val == "" {
				break
			}
			if i++; i >= maxNameRefDepth {
				break
			}
			str = val
		}
		// default to 0
		return atoi(str), nil
	case *syntax.ParenArithm:
		return Arithm(cfg, x.X)
	case *syntax.UnaryArithm:
		switch x.Op {
		case syntax.Inc, syntax.Dec:
			name := x.X.(*syntax.Word).Lit()
			old := atoi(cfg.envGet(name))
			val := old
			if x.Op == syntax.Inc {
				val++
			} else {
				val--
			}
			if err := cfg.envSet(name, strconv.Itoa(val)); err != nil {
				return 0, err
			}
			if x.Post {
				return old, nil
			}
			return val, nil
		}
		val, err := Arithm(cfg, x.X)
		if err != nil {
			return 0, err
		}
		switch x.Op {
		case syntax.Not:
			return oneIf(val == 0), nil
		case syntax.BitNegation:
			return ^val, nil
		case syntax.Plus:
			return val, nil
		default: // syntax.Minus
			return -val, nil
		}
	case *syntax.BinaryArithm:
		switch x.Op {
		case syntax.Assgn, syntax.AddAssgn, syntax.SubAssgn,
			syntax.MulAssgn, syntax.QuoAssgn, syntax.RemAssgn,
			syntax.AndAssgn, syntax.OrAssgn, syntax.XorAssgn,
			syntax.ShlAssgn, syntax.ShrAssgn:
			return cfg.assgnArit(x)
		case syntax.TernQuest: // TernColon can't happen here
			cond, err := Arithm(cfg, x.X)
			if err != nil {
				return 0, err
			}
			b2 := x.Y.(*syntax.BinaryArithm) // must have Op==TernColon
			if cond == 1 {
				return Arithm(cfg, b2.X)
			}
			return Arithm(cfg, b2.Y)
		}
		left, err := Arithm(cfg, x.X)
		if err != nil {
			return 0, err
		}
		right, err := Arithm(cfg, x.Y)
		if err != nil {
			return 0, err
		}
		return binArit(x.Op, left, right), nil
	default:
		panic(fmt.Sprintf("unexpected arithm expr: %T", x))
	}
}

func oneIf(b bool) int {
	if b {
		return 1
	}
	return 0
}

// atoi is just a shorthand for strconv.Atoi that ignores the error,
// just like shells do.
func atoi(s string) int {
	n, _ := strconv.Atoi(s)
	return n
}

func (cfg *Config) assgnArit(b *syntax.BinaryArithm) (int, error) {
	name := b.X.(*syntax.Word).Lit()
	val := atoi(cfg.envGet(name))
	arg, err := Arithm(cfg, b.Y)
	if err != nil {
		return 0, err
	}
	switch b.Op {
	case syntax.Assgn:
		val = arg
	case syntax.AddAssgn:
		val += arg
	case syntax.SubAssgn:
		val -= arg
	case syntax.MulAssgn:
		val *= arg
	case syntax.QuoAssgn:
		val /= arg
	case syntax.RemAssgn:
		val %= arg
	case syntax.AndAssgn:
		val &= arg
	case syntax.OrAssgn:
		val |= arg
	case syntax.XorAssgn:
		val ^= arg
	case syntax.ShlAssgn:
		val <<= uint(arg)
	case syntax.ShrAssgn:
		val >>= uint(arg)
	}
	if err := cfg.envSet(name, strconv.Itoa(val)); err != nil {
		return 0, err
	}
	return val, nil
}

func intPow(a, b int) int {
	p := 1
	for b > 0 {
		if b&1 != 0 {
			p *= a
		}
		b >>= 1
		a *= a
	}
	return p
}

func binArit(op syntax.BinAritOperator, x, y int) int {
	switch op {
	case syntax.Add:
		return x + y
	case syntax.Sub:
		return x - y
	case syntax.Mul:
		return x * y
	case syntax.Quo:
		return x / y
	case syntax.Rem:
		return x % y
	case syntax.Pow:
		return intPow(x, y)
	case syntax.Eql:
		return oneIf(x == y)
	case syntax.Gtr:
		return oneIf(x > y)
	case syntax.Lss:
		return oneIf(x < y)
	case syntax.Neq:
		return oneIf(x != y)
	case syntax.Leq:
		return oneIf(x <= y)
	case syntax.Geq:
		return oneIf(x >= y)
	case syntax.And:
		return x & y
	case syntax.Or:
		return x | y
	case syntax.Xor:
		return x ^ y
	case syntax.Shr:
		return x >> uint(y)
	case syntax.Shl:
		return x << uint(y)
	case syntax.AndArit:
		return oneIf(x != 0 && y != 0)
	case syntax.OrArit:
		return oneIf(x != 0 || y != 0)
	default: // syntax.Comma
		// x is executed but its result discarded
		return y
	}
}
0707010000002F000081A4000003E800000064000000016046124D000007B3000000000000000000000000000000000000001A00000000sh-3.2.4/expand/braces.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"strconv"

"mvdan.cc/sh/v3/syntax"
)

// Braces performs brace expansion on a word, given that it contains any
// syntax.BraceExp parts. For example, the word with a brace expansion
// "foo{bar,baz}" will return two literal words, "foobar" and "foobaz".
//
// Note that the resulting words may share word parts.
func Braces(word *syntax.Word) []*syntax.Word {
	var all []*syntax.Word
	var left []syntax.WordPart
	for i, wp := range word.Parts {
		br, ok := wp.(*syntax.BraceExp)
		if !ok {
			left = append(left, wp.(syntax.WordPart))
			continue
		}
		if br.Sequence {
			chars := false
			from, err1 := strconv.Atoi(br.Elems[0].Lit())
			to, err2 := strconv.Atoi(br.Elems[1].Lit())
			if err1 != nil || err2 != nil {
				chars = true
				from = int(br.Elems[0].Lit()[0])
				to = int(br.Elems[1].Lit()[0])
			}
			upward := from <= to
			incr := 1
			if !upward {
				incr = -1
			}
			if len(br.Elems) > 2 {
				n, _ := strconv.Atoi(br.Elems[2].Lit())
				if n != 0 && n > 0 == upward {
					incr = n
				}
			}
			n := from
			for {
				if upward && n > to {
					break
				}
				if !upward && n < to {
					break
				}
				next := *word
				next.Parts = next.Parts[i+1:]
				lit := &syntax.Lit{}
				if chars {
					lit.Value = string(rune(n))
				} else {
					lit.Value = strconv.Itoa(n)
				}
				next.Parts = append([]syntax.WordPart{lit}, next.Parts...)
				exp := Braces(&next)
				for _, w := range exp {
					w.Parts = append(left, w.Parts...)
				}
				all = append(all, exp...)
				n += incr
			}
			return all
		}
		for _, elem := range br.Elems {
			next := *word
			next.Parts = next.Parts[i+1:]
			next.Parts = append(elem.Parts, next.Parts...)
			exp := Braces(&next)
			for _, w := range exp {
				w.Parts = append(left, w.Parts...)
			}
			all = append(all, exp...)
		}
		return all
	}
	return []*syntax.Word{{Parts: left}}
}
07070100000030000081A4000003E800000064000000016046124D00000D93000000000000000000000000000000000000001F00000000sh-3.2.4/expand/braces_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"bytes"
	"fmt"
	"testing"

"mvdan.cc/sh/v3/syntax"
)

func lit(s string) *syntax.Lit                { return &syntax.Lit{Value: s} }
func word(ps ...syntax.WordPart) *syntax.Word { return &syntax.Word{Parts: ps} }
func litWord(s string) *syntax.Word           { return word(lit(s)) }
func litWords(strs ...string) []*syntax.Word {
	l := make([]*syntax.Word, 0, len(strs))
	for _, s := range strs {
		l = append(l, litWord(s))
	}
	return l
}

var braceTests = []struct {
	in   *syntax.Word
	want []*syntax.Word
}{
	{
		litWord("a{b"),
		litWords("a{b"),
	},
	{
		litWord("a}b"),
		litWords("a}b"),
	},
	{
		litWord("{a,b{c,d}"),
		litWords("{a,bc", "{a,bd"),
	},
	{
		litWord("{a{b"),
		litWords("{a{b"),
	},
	{
		litWord("a{}"),
		litWords("a{}"),
	},
	{
		litWord("a{b}"),
		litWords("a{b}"),
	},
	{
		litWord("a{b,c}"),
		litWords("ab", "ac"),
	},
	{
		litWord("a{à,世界}"),
		litWords("aà", "a世界"),
	},
	{
		litWord("a{b,c}d{e,f}g"),
		litWords("abdeg", "abdfg", "acdeg", "acdfg"),
	},
	{
		litWord("a{b{x,y},c}d"),
		litWords("abxd", "abyd", "acd"),
	},
	{
		litWord("a{1,2,3,4,5}"),
		litWords("a1", "a2", "a3", "a4", "a5"),
	},
	{
		litWord("a{1.."),
		litWords("a{1.."),
	},
	{
		litWord("a{1..4"),
		litWords("a{1..4"),
	},
	{
		litWord("a{1.4}"),
		litWords("a{1.4}"),
	},
	{
		litWord("{a,b}{1..4"),
		litWords("a{1..4", "b{1..4"),
	},
	{
		litWord("a{1..4}"),
		litWords("a1", "a2", "a3", "a4"),
	},
	{
		litWord("a{1..2}b{4..5}c"),
		litWords("a1b4c", "a1b5c", "a2b4c", "a2b5c"),
	},
	{
		litWord("a{1..f}"),
		litWords("a{1..f}"),
	},
	{
		litWord("a{c..f}"),
		litWords("ac", "ad", "ae", "af"),
	},
	{
		litWord("a{-..f}"),
		litWords("a{-..f}"),
	},
	{
		litWord("a{3..-}"),
		litWords("a{3..-}"),
	},
	{
		litWord("a{1..10..3}"),
		litWords("a1", "a4", "a7", "a10"),
	},
	{
		litWord("a{1..4..0}"),
		litWords("a1", "a2", "a3", "a4"),
	},
	{
		litWord("a{4..1}"),
		litWords("a4", "a3", "a2", "a1"),
	},
	{
		litWord("a{4..1..-2}"),
		litWords("a4", "a2"),
	},
	{
		litWord("a{4..1..1}"),
		litWords("a4", "a3", "a2", "a1"),
	},
	{
		litWord("a{d..k..3}"),
		litWords("ad", "ag", "aj"),
	},
	{
		litWord("a{d..k..n}"),
		litWords("a{d..k..n}"),
	},
	{
		litWord("a{k..d..-2}"),
		litWords("ak", "ai", "ag", "ae"),
	},
	{
		litWord("{1..1}"),
		litWords("1"),
	},
}

func TestBraces(t *testing.T) {
	t.Parallel()
	for i, tc := range braceTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			inStr := printWords(tc.in)
			wantStr := printWords(tc.want...)
			wantBraceExpParts(t, tc.in, false)

inBraces := *tc.in
			syntax.SplitBraces(&inBraces)
			wantBraceExpParts(t, &inBraces, inStr != wantStr)

got := Braces(&inBraces)
			gotStr := printWords(got...)
			if gotStr != wantStr {
				t.Fatalf("mismatch in %q\nwant:\n%s\ngot: %s",
					inStr, wantStr, gotStr)
			}
		})
	}
}

func wantBraceExpParts(t *testing.T, word *syntax.Word, want bool) {
	t.Helper()
	any := false
	for _, part := range word.Parts {
		if _, any = part.(*syntax.BraceExp); any {
			break
		}
	}
	if any && !want {
		t.Fatalf("didn't want any BraceExp node, but found one")
	} else if !any && want {
		t.Fatalf("wanted a BraceExp node, but found none")
	}
}

func printWords(words ...*syntax.Word) string {
	p := syntax.NewPrinter()
	var buf bytes.Buffer
	call := &syntax.CallExpr{Args: words}
	p.Print(&buf, call)
	return buf.String()
}
07070100000031000081A4000003E800000064000000016046124D000000B4000000000000000000000000000000000000001700000000sh-3.2.4/expand/doc.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package expand contains code to perform various shell expansions.
package expand
07070100000032000081A4000003E800000064000000016046124D00001816000000000000000000000000000000000000001B00000000sh-3.2.4/expand/environ.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"runtime"
	"sort"
	"strings"
)

// Environ is the base interface for a shell's environment, allowing it to fetch
// variables by name and to iterate over all the currently set variables.
type Environ interface {
	// Get retrieves a variable by its name. To check if the variable is
	// set, use Variable.IsSet.
	Get(name string) Variable

// Each iterates over all the currently set variables, calling the
	// supplied function on each variable. Iteration is stopped if the
	// function returns false.
	//
	// The names used in the calls aren't required to be unique or sorted.
	// If a variable name appears twice, the latest occurrence takes
	// priority.
	//
	// Each is required to forward exported variables when executing
	// programs.
	Each(func(name string, vr Variable) bool)
}

// WriteEnviron is an extension on Environ that supports modifying and deleting
// variables.
type WriteEnviron interface {
	Environ
	// Set sets a variable by name. If !vr.IsSet(), the variable is being
	// unset; otherwise, the variable is being replaced.
	//
	// It is the implementation's responsibility to handle variable
	// attributes correctly. For example, changing an exported variable's
	// value does not unexport it, and overwriting a name reference variable
	// should modify its target.
	//
	// An error may be returned if the operation is invalid, such as if the
	// name is empty or if we're trying to overwrite a read-only variable.
	Set(name string, vr Variable) error
}

type ValueKind uint8

const (
	Unset ValueKind = iota
	String
	NameRef
	Indexed
	Associative
)

// Variable describes a shell variable, which can have a number of attributes
// and a value.
//
// A Variable is unset if its Kind field is Unset, which can be checked via
// Variable.IsSet. The zero value of a Variable is thus a valid unset variable.
//
// If a variable is set, its Value field will be a []string if it is an indexed
// array, a map[string]string if it's an associative array, or a string
// otherwise.
type Variable struct {
	Local    bool
	Exported bool
	ReadOnly bool

Kind ValueKind

Str  string            // Used when Kind is String or NameRef.
	List []string          // Used when Kind is Indexed.
	Map  map[string]string // Used when Kind is Associative.
}

// IsSet returns whether the variable is set. An empty variable is set, but an
// undeclared variable is not.
func (v Variable) IsSet() bool {
	return v.Kind != Unset
}

// String returns the variable's value as a string. In general, this only makes
// sense if the variable has a string value or no value at all.
func (v Variable) String() string {
	switch v.Kind {
	case String:
		return v.Str
	case Indexed:
		if len(v.List) > 0 {
			return v.List[0]
		}
	case Associative:
		// nothing to do
	}
	return ""
}

// maxNameRefDepth defines the maximum number of times to follow references when
// resolving a variable. Otherwise, simple name reference loops could crash a
// program quite easily.
const maxNameRefDepth = 100

// Resolve follows a number of nameref variables, returning the last reference
// name that was followed and the variable that it points to.
func (v Variable) Resolve(env Environ) (string, Variable) {
	name := ""
	for i := 0; i < maxNameRefDepth; i++ {
		if v.Kind != NameRef {
			return name, v
		}
		name = v.Str // keep name for the next iteration
		v = env.Get(name)
	}
	return name, Variable{}
}

// FuncEnviron wraps a function mapping variable names to their string values,
// and implements Environ. Empty strings returned by the function will be
// treated as unset variables. All variables will be exported.
//
// Note that the returned Environ's Each method will be a no-op.
func FuncEnviron(fn func(string) string) Environ {
	return funcEnviron(fn)
}

type funcEnviron func(string) string

func (f funcEnviron) Get(name string) Variable {
	value := f(name)
	if value == "" {
		return Variable{}
	}
	return Variable{Exported: true, Kind: String, Str: value}
}

func (f funcEnviron) Each(func(name string, vr Variable) bool) {}

// ListEnviron returns an Environ with the supplied variables, in the form
// "key=value". All variables will be exported.
//
// On Windows, where environment variable names are case-insensitive, the
// resulting variable names will all be uppercase.
func ListEnviron(pairs ...string) Environ {
	return listEnvironWithUpper(runtime.GOOS == "windows", pairs...)
}

// listEnvironWithUpper implements ListEnviron, but letting the tests specify
// whether to uppercase all names or not.
func listEnvironWithUpper(upper bool, pairs ...string) Environ {
	list := append([]string{}, pairs...)
	if upper {
		// Uppercase before sorting, so that we can remove duplicates
		// without the need for linear search nor a map.
		for i, s := range list {
			if sep := strings.IndexByte(s, '='); sep > 0 {
				list[i] = strings.ToUpper(s[:sep]) + s[sep:]
			}
		}
	}
	sort.Strings(list)
	last := ""
	for i := 0; i < len(list); {
		s := list[i]
		sep := strings.IndexByte(s, '=')
		if sep <= 0 {
			// invalid element; remove it
			list = append(list[:i], list[i+1:]...)
			continue
		}
		name := s[:sep]
		if last == name {
			// duplicate; the last one wins
			list = append(list[:i-1], list[i:]...)
			continue
		}
		last = name
		i++
	}
	return listEnviron(list)
}

// listEnviron is a sorted list of "name=value" strings.
type listEnviron []string

func (l listEnviron) Get(name string) Variable {
	prefix := name + "="
	i := sort.SearchStrings(l, prefix)
	if i < len(l) && strings.HasPrefix(l[i], prefix) {
		return Variable{Exported: true, Kind: String, Str: strings.TrimPrefix(l[i], prefix)}
	}
	return Variable{}
}

func (l listEnviron) Each(fn func(name string, vr Variable) bool) {
	for _, pair := range l {
		i := strings.IndexByte(pair, '=')
		if i < 0 {
			// should never happen; see listEnvironWithUpper
			panic("expand.listEnviron: did not expect malformed name-value pair: " + pair)
		}
		name, value := pair[:i], pair[i+1:]
		if !fn(name, Variable{Exported: true, Kind: String, Str: value}) {
			return
		}
	}
}
07070100000033000081A4000003E800000064000000016046124D000005A5000000000000000000000000000000000000002000000000sh-3.2.4/expand/environ_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"reflect"
	"testing"
)

func TestListEnviron(t *testing.T) {
	tests := []struct {
		name  string
		upper bool
		pairs []string
		want  []string
	}{
		{
			name:  "Empty",
			pairs: nil,
			want:  []string{},
		},
		{
			name:  "Simple",
			pairs: []string{"A=b", "c="},
			want:  []string{"A=b", "c="},
		},
		{
			name:  "MissingEqual",
			pairs: []string{"A=b", "invalid", "c="},
			want:  []string{"A=b", "c="},
		},
		{
			name:  "DuplicateNames",
			pairs: []string{"A=b", "A=x", "c=", "c=y"},
			want:  []string{"A=x", "c=y"},
		},
		{
			name:  "NoName",
			pairs: []string{"=b", "=c"},
			want:  []string{},
		},
		{
			name:  "EmptyElements",
			pairs: []string{"A=b", "", "", "c="},
			want:  []string{"A=b", "c="},
		},
		{
			name:  "MixedCaseNoUpper",
			pairs: []string{"A=b1", "Path=foo", "a=b2"},
			want:  []string{"A=b1", "Path=foo", "a=b2"},
		},
		{
			name:  "MixedCaseUpper",
			upper: true,
			pairs: []string{"A=b1", "Path=foo", "a=b2"},
			want:  []string{"A=b2", "PATH=foo"},
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			gotEnv := listEnvironWithUpper(tc.upper, tc.pairs...)
			got := []string(gotEnv.(listEnviron))
			if !reflect.DeepEqual(got, tc.want) {
				t.Fatalf("ListEnviron(%t, %q) wanted %q, got %q",
					tc.upper, tc.pairs, tc.want, got)
			}
		})
	}
}
07070100000034000081A4000003E800000064000000016046124D000057B6000000000000000000000000000000000000001A00000000sh-3.2.4/expand/expand.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"os/user"
	"path/filepath"
	"regexp"
	"runtime"
	"strconv"
	"strings"

"mvdan.cc/sh/v3/pattern"
	"mvdan.cc/sh/v3/syntax"
)

// A Config specifies details about how shell expansion should be performed. The
// zero value is a valid configuration.
type Config struct {
	// Env is used to get and set environment variables when performing
	// shell expansions. Some special parameters are also expanded via this
	// interface, such as:
	//
	//   * "#", "@", "*", "0"-"9" for the shell's parameters
	//   * "?", "$", "PPID" for the shell's status and process
	//   * "HOME foo" to retrieve user foo's home directory (if unset,
	//     os/user.Lookup will be used)
	//
	// If nil, there are no environment variables set. Use
	// ListEnviron(os.Environ()...) to use the system's environment
	// variables.
	Env Environ

// CmdSubst expands a command substitution node, writing its standard
	// output to the provided io.Writer.
	//
	// If nil, encountering a command substitution will result in an
	// UnexpectedCommandError.
	CmdSubst func(io.Writer, *syntax.CmdSubst) error

// ProcSubst expands a process substitution node.
	//
	// Note that this feature is a work in progress, and the signature of
	// this field might change until #451 is completely fixed.
	ProcSubst func(*syntax.ProcSubst) (string, error)

// ReadDir is used for file path globbing. If nil, globbing is disabled.
	// Use ioutil.ReadDir to use the filesystem directly.
	ReadDir func(string) ([]os.FileInfo, error)

// GlobStar corresponds to the shell option that allows globbing with
	// "**".
	GlobStar bool

bufferAlloc bytes.Buffer
	fieldAlloc  [4]fieldPart
	fieldsAlloc [4][]fieldPart

ifs string
	// A pointer to a parameter expansion node, if we're inside one.
	// Necessary for ${LINENO}.
	curParam *syntax.ParamExp
}

// UnexpectedCommandError is returned if a command substitution is encountered
// when Config.CmdSubst is nil.
type UnexpectedCommandError struct {
	Node *syntax.CmdSubst
}

func (u UnexpectedCommandError) Error() string {
	return fmt.Sprintf("unexpected command substitution at %s", u.Node.Pos())
}

var zeroConfig = &Config{}

func prepareConfig(cfg *Config) *Config {
	if cfg == nil {
		cfg = zeroConfig
	}
	if cfg.Env == nil {
		cfg.Env = FuncEnviron(func(string) string { return "" })
	}

cfg.ifs = " \t\n"
	if vr := cfg.Env.Get("IFS"); vr.IsSet() {
		cfg.ifs = vr.String()
	}
	return cfg
}

func (cfg *Config) ifsRune(r rune) bool {
	for _, r2 := range cfg.ifs {
		if r == r2 {
			return true
		}
	}
	return false
}

func (cfg *Config) ifsJoin(strs []string) string {
	sep := ""
	if cfg.ifs != "" {
		sep = cfg.ifs[:1]
	}
	return strings.Join(strs, sep)
}

func (cfg *Config) strBuilder() *bytes.Buffer {
	b := &cfg.bufferAlloc
	b.Reset()
	return b
}

func (cfg *Config) envGet(name string) string {
	return cfg.Env.Get(name).String()
}

func (cfg *Config) envSet(name, value string) error {
	wenv, ok := cfg.Env.(WriteEnviron)
	if !ok {
		return fmt.Errorf("environment is read-only")
	}
	return wenv.Set(name, Variable{Kind: String, Str: value})
}

// Literal expands a single shell word. It is similar to Fields, but the result
// is a single string. This is the behavior when a word is used as the value in
// a shell variable assignment, for example.
//
// The config specifies shell expansion options; nil behaves the same as an
// empty config.
func Literal(cfg *Config, word *syntax.Word) (string, error) {
	if word == nil {
		return "", nil
	}
	cfg = prepareConfig(cfg)
	field, err := cfg.wordField(word.Parts, quoteNone)
	if err != nil {
		return "", err
	}
	return cfg.fieldJoin(field), nil
}

// Document expands a single shell word as if it were within double quotes. It
// is simlar to Literal, but without brace expansion, tilde expansion, and
// globbing.
//
// The config specifies shell expansion options; nil behaves the same as an
// empty config.
func Document(cfg *Config, word *syntax.Word) (string, error) {
	if word == nil {
		return "", nil
	}
	cfg = prepareConfig(cfg)
	field, err := cfg.wordField(word.Parts, quoteDouble)
	if err != nil {
		return "", err
	}
	return cfg.fieldJoin(field), nil
}

const patMode = pattern.Filenames | pattern.Braces

// Pattern expands a single shell word as a pattern, using syntax.QuotePattern
// on any non-quoted parts of the input word. The result can be used on
// syntax.TranslatePattern directly.
//
// The config specifies shell expansion options; nil behaves the same as an
// empty config.
func Pattern(cfg *Config, word *syntax.Word) (string, error) {
	cfg = prepareConfig(cfg)
	field, err := cfg.wordField(word.Parts, quoteNone)
	if err != nil {
		return "", err
	}
	buf := cfg.strBuilder()
	for _, part := range field {
		if part.quote > quoteNone {
			buf.WriteString(pattern.QuoteMeta(part.val, patMode))
		} else {
			buf.WriteString(part.val)
		}
	}
	return buf.String(), nil
}

// Format expands a format string with a number of arguments, following the
// shell's format specifications. These include printf(1), among others.
//
// The resulting string is returned, along with the number of arguments used.
//
// The config specifies shell expansion options; nil behaves the same as an
// empty config.
func Format(cfg *Config, format string, args []string) (string, int, error) {
	cfg = prepareConfig(cfg)
	buf := cfg.strBuilder()
	var fmts []byte
	initialArgs := len(args)

for i := 0; i < len(format); i++ {
		// readDigits reads from 0 to max digits, either octal or
		// hexadecimal.
		readDigits := func(max int, hex bool) string {
			j := 0
			for ; j < max; j++ {
				c := format[i+j]
				if (c >= '0' && c <= '9') ||
					(hex && c >= 'a' && c <= 'f') ||
					(hex && c >= 'A' && c <= 'F') {
					// valid octal or hex char
				} else {
					break
				}
			}
			digits := format[i : i+j]
			i += j - 1 // -1 since the outer loop does i++
			return digits
		}
		c := format[i]
		switch {
		case c == '\\': // escaped
			i++
			switch c = format[i]; c {
			case 'a': // bell
				buf.WriteByte('\a')
			case 'b': // backspace
				buf.WriteByte('\b')
			case 'e', 'E': // escape
				buf.WriteByte('\x1b')
			case 'f': // form feed
				buf.WriteByte('\f')
			case 'n': // new line
				buf.WriteByte('\n')
			case 'r': // carriage return
				buf.WriteByte('\r')
			case 't': // horizontal tab
				buf.WriteByte('\t')
			case 'v': // vertical tab
				buf.WriteByte('\v')
			case '\\', '\'', '"', '?': // just the character
				buf.WriteByte(c)
			case '0', '1', '2', '3', '4', '5', '6', '7':
				digits := readDigits(3, false)
				// if digits don't fit in 8 bits, 0xff via strconv
				n, _ := strconv.ParseUint(digits, 8, 8)
				buf.WriteByte(byte(n))
			case 'x', 'u', 'U':
				i++
				max := 2
				if c == 'u' {
					max = 4
				} else if c == 'U' {
					max = 8
				}
				digits := readDigits(max, true)
				if len(digits) > 0 {
					// can't error
					n, _ := strconv.ParseUint(digits, 16, 32)
					if c == 'x' {
						// always as a single byte
						buf.WriteByte(byte(n))
					} else {
						buf.WriteRune(rune(n))
					}
					break
				}
				fallthrough
			default: // no escape sequence
				buf.WriteByte('\\')
				buf.WriteByte(c)
			}
		case len(fmts) > 0:
			switch c {
			case '%':
				buf.WriteByte('%')
				fmts = nil
			case 'c':
				var b byte
				if len(args) > 0 {
					arg := ""
					arg, args = args[0], args[1:]
					if len(arg) > 0 {
						b = arg[0]
					}
				}
				buf.WriteByte(b)
				fmts = nil
			case '+', '-', ' ':
				if len(fmts) > 1 {
					return "", 0, fmt.Errorf("invalid format char: %c", c)
				}
				fmts = append(fmts, c)
			case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
				fmts = append(fmts, c)
			case 's', 'd', 'i', 'u', 'o', 'x':
				arg := ""
				if len(args) > 0 {
					arg, args = args[0], args[1:]
				}
				var farg interface{} = arg
				if c != 's' {
					n, _ := strconv.ParseInt(arg, 0, 0)
					if c == 'i' || c == 'd' {
						farg = int(n)
					} else {
						farg = uint(n)
					}
					if c == 'i' || c == 'u' {
						c = 'd'
					}
				}
				fmts = append(fmts, c)
				fmt.Fprintf(buf, string(fmts), farg)
				fmts = nil
			default:
				return "", 0, fmt.Errorf("invalid format char: %c", c)
			}
		case args != nil && c == '%':
			// if args == nil, we are not doing format
			// arguments
			fmts = []byte{c}
		default:
			buf.WriteByte(c)
		}
	}
	if len(fmts) > 0 {
		return "", 0, fmt.Errorf("missing format char")
	}
	return buf.String(), initialArgs - len(args), nil
}

func (cfg *Config) fieldJoin(parts []fieldPart) string {
	switch len(parts) {
	case 0:
		return ""
	case 1: // short-cut without a string copy
		return parts[0].val
	}
	buf := cfg.strBuilder()
	for _, part := range parts {
		buf.WriteString(part.val)
	}
	return buf.String()
}

func (cfg *Config) escapedGlobField(parts []fieldPart) (escaped string, glob bool) {
	buf := cfg.strBuilder()
	for _, part := range parts {
		if part.quote > quoteNone {
			buf.WriteString(pattern.QuoteMeta(part.val, patMode))
			continue
		}
		buf.WriteString(part.val)
		if pattern.HasMeta(part.val, patMode) {
			glob = true
		}
	}
	if glob { // only copy the string if it will be used
		escaped = buf.String()
	}
	return escaped, glob
}

// Fields expands a number of words as if they were arguments in a shell
// command. This includes brace expansion, tilde expansion, parameter expansion,
// command substitution, arithmetic expansion, and quote removal.
func Fields(cfg *Config, words ...*syntax.Word) ([]string, error) {
	cfg = prepareConfig(cfg)
	fields := make([]string, 0, len(words))
	dir := cfg.envGet("PWD")
	for _, word := range words {
		word := *word // make a copy, since SplitBraces replaces the Parts slice
		afterBraces := []*syntax.Word{&word}
		if syntax.SplitBraces(&word) {
			afterBraces = Braces(&word)
		}
		for _, word2 := range afterBraces {
			wfields, err := cfg.wordFields(word2.Parts)
			if err != nil {
				return nil, err
			}
			for _, field := range wfields {
				path, doGlob := cfg.escapedGlobField(field)
				var matches []string
				if doGlob && cfg.ReadDir != nil {
					matches, err = cfg.glob(dir, path)
					if err != nil {
						return nil, err
					}
					if len(matches) > 0 {
						fields = append(fields, matches...)
						continue
					}
				}
				fields = append(fields, cfg.fieldJoin(field))
			}
		}
	}
	return fields, nil
}

type fieldPart struct {
	val   string
	quote quoteLevel
}

type quoteLevel uint

const (
	quoteNone quoteLevel = iota
	quoteDouble
	quoteSingle
)

func (cfg *Config) wordField(wps []syntax.WordPart, ql quoteLevel) ([]fieldPart, error) {
	var field []fieldPart
	for i, wp := range wps {
		switch x := wp.(type) {
		case *syntax.Lit:
			s := x.Value
			if i == 0 && ql == quoteNone {
				if prefix, rest := cfg.expandUser(s); prefix != "" {
					// TODO: return two separate fieldParts,
					// like in wordFields?
					s = prefix + rest
				}
			}
			if ql == quoteDouble && strings.Contains(s, "\\") {
				buf := cfg.strBuilder()
				for i := 0; i < len(s); i++ {
					b := s[i]
					if b == '\\' && i+1 < len(s) {
						switch s[i+1] {
						case '"', '\\', '$', '`': // special chars
							continue
						}
					}
					buf.WriteByte(b)
				}
				s = buf.String()
			}
			field = append(field, fieldPart{val: s})
		case *syntax.SglQuoted:
			fp := fieldPart{quote: quoteSingle, val: x.Value}
			if x.Dollar {
				fp.val, _, _ = Format(cfg, fp.val, nil)
			}
			field = append(field, fp)
		case *syntax.DblQuoted:
			wfield, err := cfg.wordField(x.Parts, quoteDouble)
			if err != nil {
				return nil, err
			}
			for _, part := range wfield {
				part.quote = quoteDouble
				field = append(field, part)
			}
		case *syntax.ParamExp:
			val, err := cfg.paramExp(x)
			if err != nil {
				return nil, err
			}
			field = append(field, fieldPart{val: val})
		case *syntax.CmdSubst:
			val, err := cfg.cmdSubst(x)
			if err != nil {
				return nil, err
			}
			field = append(field, fieldPart{val: val})
		case *syntax.ArithmExp:
			n, err := Arithm(cfg, x.X)
			if err != nil {
				return nil, err
			}
			field = append(field, fieldPart{val: strconv.Itoa(n)})
		case *syntax.ProcSubst:
			path, err := cfg.ProcSubst(x)
			if err != nil {
				return nil, err
			}
			field = append(field, fieldPart{val: path})
		default:
			panic(fmt.Sprintf("unhandled word part: %T", x))
		}
	}
	return field, nil
}

func (cfg *Config) cmdSubst(cs *syntax.CmdSubst) (string, error) {
	if cfg.CmdSubst == nil {
		return "", UnexpectedCommandError{Node: cs}
	}
	buf := cfg.strBuilder()
	if err := cfg.CmdSubst(buf, cs); err != nil {
		return "", err
	}
	return strings.TrimRight(buf.String(), "\n"), nil
}

func (cfg *Config) wordFields(wps []syntax.WordPart) ([][]fieldPart, error) {
	fields := cfg.fieldsAlloc[:0]
	curField := cfg.fieldAlloc[:0]
	allowEmpty := false
	flush := func() {
		if len(curField) == 0 {
			return
		}
		fields = append(fields, curField)
		curField = nil
	}
	splitAdd := func(val string) {
		for i, field := range strings.FieldsFunc(val, cfg.ifsRune) {
			if i > 0 {
				flush()
			}
			curField = append(curField, fieldPart{val: field})
		}
	}
	for i, wp := range wps {
		switch x := wp.(type) {
		case *syntax.Lit:
			s := x.Value
			if i == 0 {
				prefix, rest := cfg.expandUser(s)
				curField = append(curField, fieldPart{
					quote: quoteSingle,
					val:   prefix,
				})
				s = rest
			}
			if strings.Contains(s, "\\") {
				buf := cfg.strBuilder()
				for i := 0; i < len(s); i++ {
					b := s[i]
					if b == '\\' {
						if i++; i >= len(s) {
							break
						}
						b = s[i]
					}
					buf.WriteByte(b)
				}
				s = buf.String()
			}
			curField = append(curField, fieldPart{val: s})
		case *syntax.SglQuoted:
			allowEmpty = true
			fp := fieldPart{quote: quoteSingle, val: x.Value}
			if x.Dollar {
				fp.val, _, _ = Format(cfg, fp.val, nil)
			}
			curField = append(curField, fp)
		case *syntax.DblQuoted:
			if len(x.Parts) == 1 {
				pe, _ := x.Parts[0].(*syntax.ParamExp)
				if elems := cfg.quotedElemFields(pe); elems != nil {
					for i, elem := range elems {
						if i > 0 {
							flush()
						}
						curField = append(curField, fieldPart{
							quote: quoteDouble,
							val:   elem,
						})
					}
					continue
				}
			}
			allowEmpty = true
			wfield, err := cfg.wordField(x.Parts, quoteDouble)
			if err != nil {
				return nil, err
			}
			for _, part := range wfield {
				part.quote = quoteDouble
				curField = append(curField, part)
			}
		case *syntax.ParamExp:
			val, err := cfg.paramExp(x)
			if err != nil {
				return nil, err
			}
			splitAdd(val)
		case *syntax.CmdSubst:
			val, err := cfg.cmdSubst(x)
			if err != nil {
				return nil, err
			}
			splitAdd(val)
		case *syntax.ArithmExp:
			n, err := Arithm(cfg, x.X)
			if err != nil {
				return nil, err
			}
			curField = append(curField, fieldPart{val: strconv.Itoa(n)})
		case *syntax.ProcSubst:
			path, err := cfg.ProcSubst(x)
			if err != nil {
				return nil, err
			}
			splitAdd(path)
		default:
			panic(fmt.Sprintf("unhandled word part: %T", x))
		}
	}
	flush()
	if allowEmpty && len(fields) == 0 {
		fields = append(fields, curField)
	}
	return fields, nil
}

// quotedElemFields returns the list of elements resulting from a quoted
// parameter expansion if it was in the form of ${*}, ${@}, ${foo[*], ${foo[@]},
// or ${!foo@}.
func (cfg *Config) quotedElemFields(pe *syntax.ParamExp) []string {
	if pe == nil || pe.Length || pe.Width {
		return nil
	}
	if pe.Excl {
		if pe.Names == syntax.NamesPrefixWords {
			return cfg.namesByPrefix(pe.Param.Value)
		}
		return nil
	}
	name := pe.Param.Value
	switch name {
	case "*":
		return []string{cfg.ifsJoin(cfg.Env.Get(name).List)}
	case "@":
		return cfg.Env.Get(name).List
	}
	switch nodeLit(pe.Index) {
	case "@":
		if vr := cfg.Env.Get(name); vr.Kind == Indexed {
			return vr.List
		}
	case "*":
		if vr := cfg.Env.Get(name); vr.Kind == Indexed {
			return []string{cfg.ifsJoin(vr.List)}
		}
	}
	return nil
}

func (cfg *Config) expandUser(field string) (prefix, rest string) {
	if len(field) == 0 || field[0] != '~' {
		return "", field
	}
	name := field[1:]
	if i := strings.Index(name, "/"); i >= 0 {
		rest = name[i:]
		name = name[:i]
	}
	if name == "" {
		// Current user; try via "HOME", otherwise fall back to the
		// system's appropriate home dir env var. Don't use os/user, as
		// that's overkill. We can't use os.UserHomeDir, because we want
		// to use cfg.Env, and we always want to check "HOME" first.

if vr := cfg.Env.Get("HOME"); vr.IsSet() {
			return vr.String(), rest
		}

if runtime.GOOS == "windows" {
			if vr := cfg.Env.Get("USERPROFILE"); vr.IsSet() {
				return vr.String(), rest
			}
		}
		return "", field
	}

// Not the current user; try via "HOME <name>", otherwise fall back to
	// os/user. There isn't a way to lookup user home dirs without cgo.

if vr := cfg.Env.Get("HOME " + name); vr.IsSet() {
		return vr.String(), rest
	}

u, err := user.Lookup(name)
	if err != nil {
		return "", field
	}
	return u.HomeDir, rest
}

func findAllIndex(pat, name string, n int) [][]int {
	expr, err := pattern.Regexp(pat, 0)
	if err != nil {
		return nil
	}
	rx := regexp.MustCompile(expr)
	return rx.FindAllStringIndex(name, n)
}

var rxGlobStar = regexp.MustCompile(".*")

// pathJoin2 is a simpler version of filepath.Join without cleaning the result,
// since that's needed for globbing.
func pathJoin2(elem1, elem2 string) string {
	if elem1 == "" {
		return elem2
	}
	if strings.HasSuffix(elem1, string(filepath.Separator)) {
		return elem1 + elem2
	}
	return elem1 + string(filepath.Separator) + elem2
}

// pathSplit splits a file path into its elements, retaining empty ones. Before
// splitting, slashes are replaced with filepath.Separator, so that splitting
// Unix paths on Windows works as well.
func pathSplit(path string) []string {
	path = filepath.FromSlash(path)
	return strings.Split(path, string(filepath.Separator))
}

func (cfg *Config) glob(base, pat string) ([]string, error) {
	parts := pathSplit(pat)
	matches := []string{""}
	if filepath.IsAbs(pat) {
		if parts[0] == "" {
			// unix-like
			matches[0] = string(filepath.Separator)
		} else {
			// windows (for some reason it won't work without the
			// trailing separator)
			matches[0] = parts[0] + string(filepath.Separator)
		}
		parts = parts[1:]
	}
	// TODO: as an optimization, we could do chunks of the path all at once,
	// like doing a single stat for "/foo/bar" in "/foo/bar/*".
	for i, part := range parts {
		wantDir := i < len(parts)-1
		switch {
		case part == "", part == ".", part == "..":
			for i, dir := range matches {
				matches[i] = pathJoin2(dir, part)
			}
			continue
		case !pattern.HasMeta(part, patMode):
			var newMatches []string
			for _, dir := range matches {
				match := dir
				if !filepath.IsAbs(match) {
					match = filepath.Join(base, match)
				}
				match = pathJoin2(match, part)
				info, err := os.Stat(match)
				if err != nil {
					continue
				}
				if wantDir && !info.IsDir() {
					continue
				}
				newMatches = append(newMatches, pathJoin2(dir, part))
			}
			matches = newMatches
			continue
		case part == "**" && cfg.GlobStar:
			for i, match := range matches {
				// "a/**" should match "a/ a/b a/b/cfg ..."; note
				// how the zero-match case has a trailing
				// separator.
				matches[i] = pathJoin2(match, "")
			}
			// expand all the possible levels of **
			latest := matches
			for {
				var newMatches []string
				for _, dir := range latest {
					var err error
					newMatches, err = cfg.globDir(base, dir, rxGlobStar, wantDir, newMatches)
					if err != nil {
						return nil, err
					}
				}
				if len(newMatches) == 0 {
					// not another level of directories to
					// try; stop
					break
				}
				matches = append(matches, newMatches...)
				latest = newMatches
			}
			continue
		}
		expr, err := pattern.Regexp(part, pattern.Filenames)
		if err != nil {
			// If any glob part is not a valid pattern, don't glob.
			return nil, nil
		}
		rx := regexp.MustCompile("^" + expr + "$")
		var newMatches []string
		for _, dir := range matches {
			newMatches, err = cfg.globDir(base, dir, rx, wantDir, newMatches)
			if err != nil {
				return nil, err
			}
		}
		matches = newMatches
	}
	return matches, nil
}

func (cfg *Config) globDir(base, dir string, rx *regexp.Regexp, wantDir bool, matches []string) ([]string, error) {
	fullDir := dir
	if !filepath.IsAbs(dir) {
		fullDir = filepath.Join(base, dir)
	}
	infos, err := cfg.ReadDir(fullDir)
	if err != nil {
		return nil, err
	}
	for _, info := range infos {
		name := info.Name()
		if !wantDir {
			// no filtering
		} else if mode := info.Mode(); mode&os.ModeSymlink != 0 {
			// TODO: is there a way to do this without the
			// extra syscall?
			if _, err := cfg.ReadDir(filepath.Join(fullDir, name)); err != nil {
				// symlink pointing to non-directory
				continue
			}
		} else if !mode.IsDir() {
			// definitely not a directory
			continue
		}
		if !strings.HasPrefix(rx.String(), `^\.`) && name[0] == '.' {
			continue
		}
		if rx.MatchString(name) {
			matches = append(matches, pathJoin2(dir, name))
		}
	}
	return matches, nil
}

// ReadFields TODO write doc.
//
// The config specifies shell expansion options; nil behaves the same as an
// empty config.
func ReadFields(cfg *Config, s string, n int, raw bool) []string {
	cfg = prepareConfig(cfg)
	type pos struct {
		start, end int
	}
	var fpos []pos

runes := make([]rune, 0, len(s))
	infield := false
	esc := false
	for _, r := range s {
		if infield {
			if cfg.ifsRune(r) && (raw || !esc) {
				fpos[len(fpos)-1].end = len(runes)
				infield = false
			}
		} else {
			if !cfg.ifsRune(r) && (raw || !esc) {
				fpos = append(fpos, pos{start: len(runes), end: -1})
				infield = true
			}
		}
		if r == '\\' {
			if raw || esc {
				runes = append(runes, r)
			}
			esc = !esc
			continue
		}
		runes = append(runes, r)
		esc = false
	}
	if len(fpos) == 0 {
		return nil
	}
	if infield {
		fpos[len(fpos)-1].end = len(runes)
	}

switch {
	case n == 1:
		// include heading/trailing IFSs
		fpos[0].start, fpos[0].end = 0, len(runes)
		fpos = fpos[:1]
	case n != -1 && n < len(fpos):
		// combine to max n fields
		fpos[n-1].end = fpos[len(fpos)-1].end
		fpos = fpos[:n]
	}

fields := make([]string, len(fpos))
	for i, p := range fpos {
		fields[i] = string(runes[p.start:p.end])
	}
	return fields
}
07070100000035000081A4000003E800000064000000016046124D0000062A000000000000000000000000000000000000001F00000000sh-3.2.4/expand/expand_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"os"
	"reflect"
	"strings"
	"testing"

"mvdan.cc/sh/v3/syntax"
)

func parseWord(t *testing.T, src string) *syntax.Word {
	t.Helper()
	p := syntax.NewParser()
	word, err := p.Document(strings.NewReader(src))
	if err != nil {
		t.Fatal(err)
	}
	return word
}

func TestConfigNils(t *testing.T) {
	os.Setenv("EXPAND_GLOBAL", "value")
	tests := []struct {
		name string
		cfg  *Config
		src  string
		want string
	}{
		{
			"NilConfig",
			nil,
			"$EXPAND_GLOBAL",
			"",
		},
		{
			"ZeroConfig",
			&Config{},
			"$EXPAND_GLOBAL",
			"",
		},
		{
			"EnvConfig",
			&Config{Env: ListEnviron(os.Environ()...)},
			"$EXPAND_GLOBAL",
			"value",
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			word := parseWord(t, tc.src)
			got, err := Literal(tc.cfg, word)
			if err != nil {
				t.Fatalf("did not want error, got %v", err)
			}
			if got != tc.want {
				t.Fatalf("wanted %q, got %q", tc.want, got)
			}
		})
	}
}

func TestFieldsIdempotency(t *testing.T) {
	tests := []struct {
		src  string
		want []string
	}{
		{
			"{1..4}",
			[]string{"1", "2", "3", "4"},
		},
		{
			"a{1..4}",
			[]string{"a1", "a2", "a3", "a4"},
		},
	}
	for _, tc := range tests {
		word := parseWord(t, tc.src)
		for j := 0; j < 2; j++ {
			got, err := Fields(nil, word)
			if err != nil {
				t.Fatalf("did not want error, got %v", err)
			}
			if !reflect.DeepEqual(got, tc.want) {
				t.Fatalf("wanted %q, got %q", tc.want, got)
			}
		}
	}
}
07070100000036000081A4000003E800000064000000016046124D00001CFC000000000000000000000000000000000000001900000000sh-3.2.4/expand/param.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package expand

import (
	"fmt"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"unicode"
	"unicode/utf8"

"mvdan.cc/sh/v3/pattern"
	"mvdan.cc/sh/v3/syntax"
)

func nodeLit(node syntax.Node) string {
	if word, ok := node.(*syntax.Word); ok {
		return word.Lit()
	}
	return ""
}

type UnsetParameterError struct {
	Node    *syntax.ParamExp
	Message string
}

func (u UnsetParameterError) Error() string {
	return u.Message
}

func (cfg *Config) paramExp(pe *syntax.ParamExp) (string, error) {
	oldParam := cfg.curParam
	cfg.curParam = pe
	defer func() { cfg.curParam = oldParam }()

name := pe.Param.Value
	index := pe.Index
	switch name {
	case "@", "*":
		index = &syntax.Word{Parts: []syntax.WordPart{
			&syntax.Lit{Value: name},
		}}
	}
	var vr Variable
	switch name {
	case "LINENO":
		// This is the only parameter expansion that the environment
		// interface cannot satisfy.
		line := uint64(cfg.curParam.Pos().Line())
		vr = Variable{Kind: String, Str: strconv.FormatUint(line, 10)}
	default:
		vr = cfg.Env.Get(name)
	}
	orig := vr
	_, vr = vr.Resolve(cfg.Env)
	str, err := cfg.varInd(vr, index)
	if err != nil {
		return "", err
	}
	slicePos := func(n int) int {
		if n < 0 {
			n = len(str) + n
			if n < 0 {
				n = len(str)
			}
		} else if n > len(str) {
			n = len(str)
		}
		return n
	}
	elems := []string{str}
	switch nodeLit(index) {
	case "@", "*":
		switch vr.Kind {
		case Unset:
			elems = nil
		case Indexed:
			elems = vr.List
		}
	}
	switch {
	case pe.Length:
		n := len(elems)
		switch nodeLit(index) {
		case "@", "*":
		default:
			n = utf8.RuneCountInString(str)
		}
		str = strconv.Itoa(n)
	case pe.Excl:
		var strs []string
		switch {
		case pe.Names != 0:
			strs = cfg.namesByPrefix(pe.Param.Value)
		case orig.Kind == NameRef:
			strs = append(strs, orig.Str)
		case vr.Kind == Indexed:
			for i, e := range vr.List {
				if e != "" {
					strs = append(strs, strconv.Itoa(i))
				}
			}
		case vr.Kind == Associative:
			for k := range vr.Map {
				strs = append(strs, k)
			}
		case !syntax.ValidName(str):
			return "", fmt.Errorf("invalid indirect expansion")
		default:
			vr = cfg.Env.Get(str)
			strs = append(strs, vr.String())
		}
		sort.Strings(strs)
		str = strings.Join(strs, " ")
	case pe.Slice != nil:
		if pe.Slice.Offset != nil {
			n, err := Arithm(cfg, pe.Slice.Offset)
			if err != nil {
				return "", err
			}
			str = str[slicePos(n):]
		}
		if pe.Slice.Length != nil {
			n, err := Arithm(cfg, pe.Slice.Length)
			if err != nil {
				return "", err
			}
			str = str[:slicePos(n)]
		}
	case pe.Repl != nil:
		orig, err := Pattern(cfg, pe.Repl.Orig)
		if err != nil {
			return "", err
		}
		with, err := Literal(cfg, pe.Repl.With)
		if err != nil {
			return "", err
		}
		n := 1
		if pe.Repl.All {
			n = -1
		}
		locs := findAllIndex(orig, str, n)
		buf := cfg.strBuilder()
		last := 0
		for _, loc := range locs {
			buf.WriteString(str[last:loc[0]])
			buf.WriteString(with)
			last = loc[1]
		}
		buf.WriteString(str[last:])
		str = buf.String()
	case pe.Exp != nil:
		arg, err := Literal(cfg, pe.Exp.Word)
		if err != nil {
			return "", err
		}
		switch op := pe.Exp.Op; op {
		case syntax.AlternateUnsetOrNull:
			if str == "" {
				break
			}
			fallthrough
		case syntax.AlternateUnset:
			if vr.IsSet() {
				str = arg
			}
		case syntax.DefaultUnset:
			if vr.IsSet() {
				break
			}
			fallthrough
		case syntax.DefaultUnsetOrNull:
			if str == "" {
				str = arg
			}
		case syntax.ErrorUnset:
			if vr.IsSet() {
				break
			}
			fallthrough
		case syntax.ErrorUnsetOrNull:
			if str == "" {
				return "", UnsetParameterError{
					Node:    pe,
					Message: arg,
				}
			}
		case syntax.AssignUnset:
			if vr.IsSet() {
				break
			}
			fallthrough
		case syntax.AssignUnsetOrNull:
			if str == "" {
				if err := cfg.envSet(name, arg); err != nil {
					return "", err
				}
				str = arg
			}
		case syntax.RemSmallPrefix, syntax.RemLargePrefix,
			syntax.RemSmallSuffix, syntax.RemLargeSuffix:
			suffix := op == syntax.RemSmallSuffix || op == syntax.RemLargeSuffix
			small := op == syntax.RemSmallPrefix || op == syntax.RemSmallSuffix
			for i, elem := range elems {
				elems[i] = removePattern(elem, arg, suffix, small)
			}
			str = strings.Join(elems, " ")
		case syntax.UpperFirst, syntax.UpperAll,
			syntax.LowerFirst, syntax.LowerAll:

caseFunc := unicode.ToLower
			if op == syntax.UpperFirst || op == syntax.UpperAll {
				caseFunc = unicode.ToUpper
			}
			all := op == syntax.UpperAll || op == syntax.LowerAll

// empty string means '?'; nothing to do there
			expr, err := pattern.Regexp(arg, 0)
			if err != nil {
				return str, nil
			}
			rx := regexp.MustCompile(expr)

for i, elem := range elems {
				rs := []rune(elem)
				for ri, r := range rs {
					if rx.MatchString(string(r)) {
						rs[ri] = caseFunc(r)
						if !all {
							break
						}
					}
				}
				elems[i] = string(rs)
			}
			str = strings.Join(elems, " ")
		case syntax.OtherParamOps:
			switch arg {
			case "Q":
				str = strconv.Quote(str)
			case "E":
				tail := str
				var rns []rune
				for tail != "" {
					var rn rune
					rn, _, tail, _ = strconv.UnquoteChar(tail, 0)
					rns = append(rns, rn)
				}
				str = string(rns)
			case "P", "A", "a":
				panic(fmt.Sprintf("unhandled @%s param expansion", arg))
			default:
				panic(fmt.Sprintf("unexpected @%s param expansion", arg))
			}
		}
	}
	return str, nil
}

func removePattern(str, pat string, fromEnd, shortest bool) string {
	var mode pattern.Mode
	if shortest {
		mode |= pattern.Shortest
	}
	expr, err := pattern.Regexp(pat, mode)
	if err != nil {
		return str
	}
	switch {
	case fromEnd && shortest:
		// use .* to get the right-most shortest match
		expr = ".*(" + expr + ")$"
	case fromEnd:
		// simple suffix
		expr = "(" + expr + ")$"
	default:
		// simple prefix
		expr = "^(" + expr + ")"
	}
	// no need to check error as Translate returns one
	rx := regexp.MustCompile(expr)
	if loc := rx.FindStringSubmatchIndex(str); loc != nil {
		// remove the original pattern (the submatch)
		str = str[:loc[2]] + str[loc[3]:]
	}
	return str
}

func (cfg *Config) varInd(vr Variable, idx syntax.ArithmExpr) (string, error) {
	if idx == nil {
		return vr.String(), nil
	}
	switch vr.Kind {
	case String:
		n, err := Arithm(cfg, idx)
		if err != nil {
			return "", err
		}
		if n == 0 {
			return vr.Str, nil
		}
	case Indexed:
		switch nodeLit(idx) {
		case "*", "@":
			return strings.Join(vr.List, " "), nil
		}
		i, err := Arithm(cfg, idx)
		if err != nil {
			return "", err
		}
		if i < 0 {
			return "", fmt.Errorf("negative array index")
		}
		if i < len(vr.List) {
			return vr.List[i], nil
		}
	case Associative:
		switch lit := nodeLit(idx); lit {
		case "@", "*":
			strs := make([]string, 0, len(vr.Map))
			for _, val := range vr.Map {
				strs = append(strs, val)
			}
			sort.Strings(strs)
			if lit == "*" {
				return cfg.ifsJoin(strs), nil
			}
			return strings.Join(strs, " "), nil
		}
		val, err := Literal(cfg, idx.(*syntax.Word))
		if err != nil {
			return "", err
		}
		return vr.Map[val], nil
	}
	return "", nil
}

func (cfg *Config) namesByPrefix(prefix string) []string {
	var names []string
	cfg.Env.Each(func(name string, vr Variable) bool {
		if strings.HasPrefix(name, prefix) {
			names = append(names, name)
		}
		return true
	})
	return names
}
07070100000037000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001200000000sh-3.2.4/fileutil07070100000038000081A4000003E800000064000000016046124D000007A5000000000000000000000000000000000000001A00000000sh-3.2.4/fileutil/file.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package fileutil contains code to work with shell files, also known
// as shell scripts.
package fileutil

import (
	"os"
	"regexp"
	"strings"
)

var (
	shebangRe = regexp.MustCompile(`^#!\s?/(usr/)?bin/(env\s+)?(sh|bash)\s`)
	extRe     = regexp.MustCompile(`\.(sh|bash)$`)
)

// HasShebang reports whether bs begins with a valid sh or bash shebang.
// It supports variations with /usr and env.
func HasShebang(bs []byte) bool {
	return shebangRe.Match(bs)
}

// ScriptConfidence defines how likely a file is to be a shell script,
// from complete certainty that it is not one to complete certainty that
// it is one.
type ScriptConfidence int

const (
	// ConfNotScript describes files which are definitely not shell scripts,
	// such as non-regular files or files with a non-shell extension.
	ConfNotScript ScriptConfidence = iota

// ConfIfShebang describes files which might be shell scripts, depending
	// on the shebang line in the file's contents. Since CouldBeScript only
	// works on os.FileInfo, the answer in this case can't be final.
	ConfIfShebang

// ConfIsScript describes files which are definitely shell scripts,
	// which are regular files with a valid shell extension.
	ConfIsScript
)

// CouldBeScript reports how likely a file is to be a shell script. It
// discards directories, symlinks, hidden files and files with non-shell
// extensions.
func CouldBeScript(info os.FileInfo) ScriptConfidence {
	name := info.Name()
	switch {
	case info.IsDir(), name[0] == '.':
		return ConfNotScript
	case info.Mode()&os.ModeSymlink != 0:
		return ConfNotScript
	case extRe.MatchString(name):
		return ConfIsScript
	case strings.IndexByte(name, '.') > 0:
		return ConfNotScript // different extension
	case info.Size() < int64(len("#/bin/sh\n")):
		return ConfNotScript // cannot possibly hold valid shebang
	default:
		return ConfIfShebang
	}
}
07070100000039000081A4000003E800000064000000016046124D000001C8000000000000000000000000000000000000001000000000sh-3.2.4/go.modmodule mvdan.cc/sh/v3

go 1.14

require (
	github.com/creack/pty v1.1.11
	github.com/google/renameio v0.1.0
	github.com/kr/pretty v0.2.1
	github.com/pkg/diff v0.0.0-20200914180035-5b29258ca4f7
	github.com/rogpeppe/go-internal v1.6.2
	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
	golang.org/x/sys v0.0.0-20201029080932-201ba4db2418
	golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407
	mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157
)
0707010000003A000081A4000003E800000064000000016046124D00000DE2000000000000000000000000000000000000001000000000sh-3.2.4/go.sumgithub.com/creack/pty v1.1.11 h1:07n33Z8lZxZ2qwegKbObQohDhXDQxiMMz1NOUGYlesw=
github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/google/renameio v0.1.0 h1:GOZbcHa3HfsPKPlmyPyN2KEohoMXOhdMbHrvbpl2QaA=
github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pkg/diff v0.0.0-20200914180035-5b29258ca4f7 h1:+/+DxvQaYifJ+grD4klzrS5y+KJXldn/2YTl5JG+vZ8=
github.com/pkg/diff v0.0.0-20200914180035-5b29258ca4f7/go.mod h1:zO8QMzTeZd5cpnIkz/Gn6iK0jDfGicM1nynOkkPIl28=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.6.2 h1:aIihoIOHCiLZHxyoNQ+ABL4NKhFTgKLBdMLyEAh98m0=
github.com/rogpeppe/go-internal v1.6.2/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 h1:SQFwaSi55rU7vdNs9Yr0Z324VNlrF+0wMqRXT4St8ck=
golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201029080932-201ba4db2418 h1:HlFl4V6pEMziuLXyRkm5BIYq1y1GAbb02pRlWvI54OM=
golang.org/x/sys v0.0.0-20201029080932-201ba4db2418/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407 h1:5zh5atpUEdIc478E/ebrIaHLKcfVvG6dL/fGv7BcMoM=
golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0 h1:0vLT13EuvQ0hNvakwLuFZ/jYrLp5F3kcWHXdRggjCE8=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157 h1:VBYz8greWWP8BDpRX0v7SDv/8rNlZVmdHdO4ZSsHj/E=
mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157/go.mod h1:Ge4atmRUYqueGppvJ7JNrtqpqokoJEFxYbP0Z+WeKS8=
0707010000003B000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001000000000sh-3.2.4/interp0707010000003C000081A4000003E800000064000000016046124D00003D43000000000000000000000000000000000000001700000000sh-3.2.4/interp/api.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package interp implements an interpreter that executes shell
// programs. It aims to support POSIX, but its support is not complete
// yet. It also supports some Bash features.
package interp

import (
	"context"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"math/rand"
	"os"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"time"

"golang.org/x/sync/errgroup"
	"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

// A Runner interprets shell programs. It can be reused, but it is not safe for
// concurrent use. You should typically use New to build a new Runner.
//
// Note that writes to Stdout and Stderr may be concurrent if background
// commands are used. If you plan on using an io.Writer implementation that
// isn't safe for concurrent use, consider a workaround like hiding writes
// behind a mutex.
//
// To create a Runner, use New. Runner's exported fields are meant to be
// configured via runner options; once a Runner has been created, the fields
// should be treated as read-only.
type Runner struct {
	// Env specifies the environment of the interpreter, which must be
	// non-nil.
	Env expand.Environ

// Dir specifies the working directory of the command, which must be an
	// absolute path.
	Dir string

// Params are the current shell parameters, e.g. from running a shell
	// file or calling a function. Accessible via the $@/$* family of vars.
	Params []string

// Separate maps - note that bash allows a name to be both a var and a
	// func simultaneously

Vars  map[string]expand.Variable
	Funcs map[string]*syntax.Stmt

alias map[string]alias

// execHandler is a function responsible for executing programs. It must be non-nil.
	execHandler ExecHandlerFunc

// openHandler is a function responsible for opening files. It must be non-nil.
	openHandler OpenHandlerFunc

stdin  io.Reader
	stdout io.Writer
	stderr io.Writer

ecfg *expand.Config
	ectx context.Context // just so that Runner.Subshell can use it again

// didReset remembers whether the runner has ever been reset. This is
	// used so that Reset is automatically called when running any program
	// or node for the first time on a Runner.
	didReset bool

usedNew bool

// rand is used mainly to generate temporary files.
	rand *rand.Rand

// wgProcSubsts allows waiting for any process substitution sub-shells
	// to finish running.
	wgProcSubsts sync.WaitGroup

filename string // only if Node was a File

// like Vars, but local to a func i.e. "local foo=bar"
	funcVars map[string]expand.Variable

// like Vars, but local to a cmd i.e. "foo=bar prog args..."
	cmdVars map[string]string

// >0 to break or continue out of N enclosing loops
	breakEnclosing, contnEnclosing int

inLoop    bool
	inFunc    bool
	inSource  bool
	noErrExit bool

// track if a sourced script set positional parameters
	sourceSetParams bool

err       error // current shell exit code or fatal error
	exitShell bool  // whether the shell needs to exit

// The current and last exit status code. They can only be different if
	// the interpreter is in the middle of running a statement. In that
	// scenario, 'exit' is the status code for the statement being run, and
	// 'lastExit' corresponds to the previous statement that was run.
	exit     int
	lastExit int

bgShells errgroup.Group

opts runnerOpts

origDir    string
	origParams []string
	origOpts   runnerOpts
	origStdin  io.Reader
	origStdout io.Writer
	origStderr io.Writer

// Most scripts don't use pushd/popd, so make space for the initial PWD
	// without requiring an extra allocation.
	dirStack     []string
	dirBootstrap [1]string

optState getopts

// keepRedirs is used so that "exec" can make any redirections
	// apply to the current shell, and not just the command.
	keepRedirs bool
}

type alias struct {
	args  []*syntax.Word
	blank bool
}

func (r *Runner) optByFlag(flag string) *bool {
	for i, opt := range &shellOptsTable {
		if opt.flag == flag {
			return &r.opts[i]
		}
	}
	return nil
}

// New creates a new Runner, applying a number of options. If applying any of
// the options results in an error, it is returned.
//
// Any unset options fall back to their defaults. For example, not supplying the
// environment falls back to the process's environment, and not supplying the
// standard output writer means that the output will be discarded.
func New(opts ...RunnerOption) (*Runner, error) {
	r := &Runner{
		usedNew:     true,
		execHandler: DefaultExecHandler(2 * time.Second),
		openHandler: DefaultOpenHandler(),
	}
	r.dirStack = r.dirBootstrap[:0]
	for _, opt := range opts {
		if err := opt(r); err != nil {
			return nil, err
		}
	}
	// Set the default fallbacks, if necessary.
	if r.Env == nil {
		Env(nil)(r)
	}
	if r.Dir == "" {
		if err := Dir("")(r); err != nil {
			return nil, err
		}
	}
	if r.stdout == nil || r.stderr == nil {
		StdIO(r.stdin, r.stdout, r.stderr)(r)
	}
	return r, nil
}

// RunnerOption is a function which can be passed to New to alter Runner behaviour.
// To apply option to existing Runner call it directly,
// for example interp.Params("-e")(runner).
type RunnerOption func(*Runner) error

// Env sets the interpreter's environment. If nil, a copy of the current
// process's environment is used.
func Env(env expand.Environ) RunnerOption {
	return func(r *Runner) error {
		if env == nil {
			env = expand.ListEnviron(os.Environ()...)
		}
		r.Env = env
		return nil
	}
}

// Dir sets the interpreter's working directory. If empty, the process's current
// directory is used.
func Dir(path string) RunnerOption {
	return func(r *Runner) error {
		if path == "" {
			path, err := os.Getwd()
			if err != nil {
				return fmt.Errorf("could not get current dir: %v", err)
			}
			r.Dir = path
			return nil
		}
		path, err := filepath.Abs(path)
		if err != nil {
			return fmt.Errorf("could not get absolute dir: %v", err)
		}
		info, err := os.Stat(path)
		if err != nil {
			return fmt.Errorf("could not stat: %v", err)
		}
		if !info.IsDir() {
			return fmt.Errorf("%s is not a directory", path)
		}
		r.Dir = path
		return nil
	}
}

// Params populates the shell options and parameters. For example, Params("-e",
// "--", "foo") will set the "-e" option and the parameters ["foo"], and
// Params("+e") will unset the "-e" option and leave the parameters untouched.
//
// This is similar to what the interpreter's "set" builtin does.
func Params(args ...string) RunnerOption {
	return func(r *Runner) error {
		onlyFlags := true
		for len(args) > 0 {
			arg := args[0]
			if arg == "" || (arg[0] != '-' && arg[0] != '+') {
				onlyFlags = false
				break
			}
			if arg == "--" {
				onlyFlags = false
				args = args[1:]
				break
			}
			enable := arg[0] == '-'
			var opt *bool
			if flag := arg[1:]; flag == "o" {
				args = args[1:]
				if len(args) == 0 && enable {
					for i, opt := range &shellOptsTable {
						r.printOptLine(opt.name, r.opts[i])
					}
					break
				}
				if len(args) == 0 && !enable {
					for i, opt := range &shellOptsTable {
						setFlag := "+o"
						if r.opts[i] {
							setFlag = "-o"
						}
						r.outf("set %s %s\n", setFlag, opt.name)
					}
					break
				}
				opt = r.optByName(args[0], false)
			} else {
				opt = r.optByFlag(flag)
			}
			if opt == nil {
				return fmt.Errorf("invalid option: %q", arg)
			}
			*opt = enable
			args = args[1:]
		}
		if !onlyFlags {
			// If "--" wasn't given and there were zero arguments,
			// we don't want to override the current parameters.
			r.Params = args

// Record whether a sourced script sets the parameters.
			if r.inSource {
				r.sourceSetParams = true
			}
		}
		return nil
	}
}

// ExecHandler sets command execution handler. See ExecHandlerFunc for more info.
func ExecHandler(f ExecHandlerFunc) RunnerOption {
	return func(r *Runner) error {
		r.execHandler = f
		return nil
	}
}

// OpenHandler sets file open handler. See OpenHandlerFunc for more info.
func OpenHandler(f OpenHandlerFunc) RunnerOption {
	return func(r *Runner) error {
		r.openHandler = f
		return nil
	}
}

// StdIO configures an interpreter's standard input, standard output, and
// standard error. If out or err are nil, they default to a writer that discards
// the output.
func StdIO(in io.Reader, out, err io.Writer) RunnerOption {
	return func(r *Runner) error {
		r.stdin = in
		if out == nil {
			out = ioutil.Discard
		}
		r.stdout = out
		if err == nil {
			err = ioutil.Discard
		}
		r.stderr = err
		return nil
	}
}

func (r *Runner) optByName(name string, bash bool) *bool {
	if bash {
		for i, optName := range bashOptsTable {
			if optName == name {
				return &r.opts[len(shellOptsTable)+i]
			}
		}
	}
	for i, opt := range &shellOptsTable {
		if opt.name == name {
			return &r.opts[i]
		}
	}
	return nil
}

type runnerOpts [len(shellOptsTable) + len(bashOptsTable)]bool

var shellOptsTable = [...]struct {
	flag, name string
}{
	// sorted alphabetically by name; use a space for the options
	// that have no flag form
	{"a", "allexport"},
	{"e", "errexit"},
	{"n", "noexec"},
	{"f", "noglob"},
	{"u", "nounset"},
	{" ", "pipefail"},
}

var bashOptsTable = [...]string{
	// sorted alphabetically by name
	"expand_aliases",
	"globstar",
}

// To access the shell options arrays without a linear search when we
// know which option we're after at compile time. First come the shell options,
// then the bash options.
const (
	optAllExport = iota
	optErrExit
	optNoExec
	optNoGlob
	optNoUnset
	optPipeFail

optExpandAliases
	optGlobStar
)

// Reset returns a runner to its initial state, right before the first call to
// Run or Reset.
//
// Typically, this function only needs to be called if a runner is reused to run
// multiple programs non-incrementally. Not calling Reset between each run will
// mean that the shell state will be kept, including variables, options, and the
// current directory.
func (r *Runner) Reset() {
	if !r.usedNew {
		panic("use interp.New to construct a Runner")
	}
	if !r.didReset {
		r.origDir = r.Dir
		r.origParams = r.Params
		r.origOpts = r.opts
		r.origStdin = r.stdin
		r.origStdout = r.stdout
		r.origStderr = r.stderr
	}
	// reset the internal state
	*r = Runner{
		Env:         r.Env,
		execHandler: r.execHandler,
		openHandler: r.openHandler,

// These can be set by functions like Dir or Params, but
		// builtins can overwrite them; reset the fields to whatever the
		// constructor set up.
		Dir:    r.origDir,
		Params: r.origParams,
		opts:   r.origOpts,
		stdin:  r.origStdin,
		stdout: r.origStdout,
		stderr: r.origStderr,

origDir:    r.origDir,
		origParams: r.origParams,
		origOpts:   r.origOpts,
		origStdin:  r.origStdin,
		origStdout: r.origStdout,
		origStderr: r.origStderr,

// emptied below, to reuse the space
		Vars:     r.Vars,
		cmdVars:  r.cmdVars,
		dirStack: r.dirStack[:0],
		usedNew:  r.usedNew,
	}
	if r.Vars == nil {
		r.Vars = make(map[string]expand.Variable)
	} else {
		for k := range r.Vars {
			delete(r.Vars, k)
		}
	}
	if r.cmdVars == nil {
		r.cmdVars = make(map[string]string)
	} else {
		for k := range r.cmdVars {
			delete(r.cmdVars, k)
		}
	}
	if vr := r.Env.Get("HOME"); !vr.IsSet() {
		home, _ := os.UserHomeDir()
		r.Vars["HOME"] = expand.Variable{Kind: expand.String, Str: home}
	}
	r.Vars["UID"] = expand.Variable{
		Kind:     expand.String,
		ReadOnly: true,
		Str:      strconv.Itoa(os.Getuid()),
	}
	r.Vars["PWD"] = expand.Variable{Kind: expand.String, Str: r.Dir}
	r.Vars["IFS"] = expand.Variable{Kind: expand.String, Str: " \t\n"}
	r.Vars["OPTIND"] = expand.Variable{Kind: expand.String, Str: "1"}

if runtime.GOOS == "windows" {
		// convert $PATH to a unix path list
		path := r.Env.Get("PATH").String()
		path = strings.Join(filepath.SplitList(path), ":")
		r.Vars["PATH"] = expand.Variable{Kind: expand.String, Str: path}
	}

r.dirStack = append(r.dirStack, r.Dir)
	r.didReset = true
}

// exitStatus is a non-zero status code resulting from running a shell node.
type exitStatus uint8

func (s exitStatus) Error() string { return fmt.Sprintf("exit status %d", s) }

// NewExitStatus creates an error which contains the specified exit status code.
func NewExitStatus(status uint8) error {
	return exitStatus(status)
}

// IsExitStatus checks whether error contains an exit status and returns it.
func IsExitStatus(err error) (status uint8, ok bool) {
	var s exitStatus
	if errors.As(err, &s) {
		return uint8(s), true
	}
	return 0, false
}

// Run interprets a node, which can be a *File, *Stmt, or Command. If a non-nil
// error is returned, it will typically contain commands exit status,
// which can be retrieved with IsExitStatus.
//
// Run can be called multiple times synchronously to interpret programs
// incrementally. To reuse a Runner without keeping the internal shell state,
// call Reset.
func (r *Runner) Run(ctx context.Context, node syntax.Node) error {
	if !r.didReset {
		r.Reset()
	}
	r.fillExpandConfig(ctx)
	r.err = nil
	r.exitShell = false
	r.filename = ""
	switch x := node.(type) {
	case *syntax.File:
		r.filename = x.Name
		r.stmts(ctx, x.Stmts)
	case *syntax.Stmt:
		r.stmt(ctx, x)
	case syntax.Command:
		r.cmd(ctx, x)
	default:
		return fmt.Errorf("node can only be File, Stmt, or Command: %T", x)
	}
	if r.exit != 0 {
		r.setErr(NewExitStatus(uint8(r.exit)))
	}
	return r.err
}

// Exited reports whether the last Run call should exit an entire shell. This
// can be triggered by the "exit" built-in command, for example.
//
// Note that this state is overwritten at every Run call, so it should be
// checked immediately after each Run call.
func (r *Runner) Exited() bool {
	return r.exitShell
}

// Subshell makes a copy of the given Runner, suitable for use concurrently
// with the original.  The copy will have the same environment, including
// variables and functions, but they can all be modified without affecting the
// original.
//
// Subshell is not safe to use concurrently with Run.  Orchestrating this is
// left up to the caller; no locking is performed.
//
// To replace e.g. stdin/out/err, do StdIO(r.stdin, r.stdout, r.stderr)(r) on
// the copy.
func (r *Runner) Subshell() *Runner {
	// Keep in sync with the Runner type. Manually copy fields, to not copy
	// sensitive ones like errgroup.Group, and to do deep copies of slices.
	r2 := &Runner{
		Env:         r.Env,
		Dir:         r.Dir,
		Params:      r.Params,
		execHandler: r.execHandler,
		openHandler: r.openHandler,
		stdin:       r.stdin,
		stdout:      r.stdout,
		stderr:      r.stderr,
		filename:    r.filename,
		opts:        r.opts,
		usedNew:     r.usedNew,
		exit:        r.exit,
		lastExit:    r.lastExit,

origStdout: r.origStdout, // used for process substitutions
	}
	r2.Vars = make(map[string]expand.Variable, len(r.Vars))
	for k, v := range r.Vars {
		v2 := v
		// Make deeper copies of List and Map, but ensure that they remain nil
		// if they are nil in v.
		v2.List = append([]string(nil), v.List...)
		if v.Map != nil {
			v2.Map = make(map[string]string, len(v.Map))
			for k, v := range v.Map {
				v2.Map[k] = v
			}
		}
		r2.Vars[k] = v2
	}
	r2.funcVars = make(map[string]expand.Variable, len(r.funcVars))
	for k, v := range r.funcVars {
		r2.funcVars[k] = v
	}
	r2.cmdVars = make(map[string]string, len(r.cmdVars))
	for k, v := range r.cmdVars {
		r2.cmdVars[k] = v
	}
	r2.Funcs = make(map[string]*syntax.Stmt, len(r.Funcs))
	for k, v := range r.Funcs {
		r2.Funcs[k] = v
	}
	if l := len(r.alias); l > 0 {
		r2.alias = make(map[string]alias, l)
		for k, v := range r.alias {
			r2.alias[k] = v
		}
	}

r2.dirStack = append(r2.dirBootstrap[:0], r.dirStack...)
	r2.fillExpandConfig(r.ectx)
	r2.didReset = true
	return r2
}
0707010000003D000081A4000003E800000064000000016046124D00003E1B000000000000000000000000000000000000001B00000000sh-3.2.4/interp/builtin.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

func isBuiltin(name string) bool {
	switch name {
	case "true", ":", "false", "exit", "set", "shift", "unset",
		"echo", "printf", "break", "continue", "pwd", "cd",
		"wait", "builtin", "trap", "type", "source", ".", "command",
		"dirs", "pushd", "popd", "umask", "alias", "unalias",
		"fg", "bg", "getopts", "eval", "test", "[", "exec",
		"return", "read", "shopt":
		return true
	}
	return false
}

func oneIf(b bool) int {
	if b {
		return 1
	}
	return 0
}

// atoi is just a shorthand for strconv.Atoi that ignores the error,
// just like shells do.
func atoi(s string) int {
	n, _ := strconv.Atoi(s)
	return n
}

func (r *Runner) builtinCode(ctx context.Context, pos syntax.Pos, name string, args []string) int {
	switch name {
	case "true", ":":
	case "false":
		return 1
	case "exit":
		r.exitShell = true
		switch len(args) {
		case 0:
			return r.lastExit
		case 1:
			n, err := strconv.Atoi(args[0])
			if err != nil {
				r.errf("invalid exit status code: %q\n", args[0])
				return 2
			}
			return n
		default:
			r.errf("exit cannot take multiple arguments\n")
			return 1
		}
	case "set":
		if err := Params(args...)(r); err != nil {
			r.errf("set: %v\n", err)
			return 2
		}
		r.updateExpandOpts()
	case "shift":
		n := 1
		switch len(args) {
		case 0:
		case 1:
			if n2, err := strconv.Atoi(args[0]); err == nil {
				n = n2
				break
			}
			fallthrough
		default:
			r.errf("usage: shift [n]\n")
			return 2
		}
		if n >= len(r.Params) {
			r.Params = nil
		} else {
			r.Params = r.Params[n:]
		}
	case "unset":
		vars := true
		funcs := true
	unsetOpts:
		for i, arg := range args {
			switch arg {
			case "-v":
				funcs = false
			case "-f":
				vars = false
			default:
				args = args[i:]
				break unsetOpts
			}
		}

for _, arg := range args {
			if vr := r.lookupVar(arg); vr.IsSet() && vars {
				r.delVar(arg)
				continue
			}
			if _, ok := r.Funcs[arg]; ok && funcs {
				delete(r.Funcs, arg)
			}
		}
	case "echo":
		newline, doExpand := true, false
	echoOpts:
		for len(args) > 0 {
			switch args[0] {
			case "-n":
				newline = false
			case "-e":
				doExpand = true
			case "-E": // default
			default:
				break echoOpts
			}
			args = args[1:]
		}
		for i, arg := range args {
			if i > 0 {
				r.out(" ")
			}
			if doExpand {
				arg, _, _ = expand.Format(r.ecfg, arg, nil)
			}
			r.out(arg)
		}
		if newline {
			r.out("\n")
		}
	case "printf":
		if len(args) == 0 {
			r.errf("usage: printf format [arguments]\n")
			return 2
		}
		format, args := args[0], args[1:]
		for {
			s, n, err := expand.Format(r.ecfg, format, args)
			if err != nil {
				r.errf("%v\n", err)
				return 1
			}
			r.out(s)
			args = args[n:]
			if n == 0 || len(args) == 0 {
				break
			}
		}
	case "break", "continue":
		if !r.inLoop {
			r.errf("%s is only useful in a loop", name)
			break
		}
		enclosing := &r.breakEnclosing
		if name == "continue" {
			enclosing = &r.contnEnclosing
		}
		switch len(args) {
		case 0:
			*enclosing = 1
		case 1:
			if n, err := strconv.Atoi(args[0]); err == nil {
				*enclosing = n
				break
			}
			fallthrough
		default:
			r.errf("usage: %s [n]\n", name)
			return 2
		}
	case "pwd":
		r.outf("%s\n", r.envGet("PWD"))
	case "cd":
		var path string
		switch len(args) {
		case 0:
			path = r.envGet("HOME")
		case 1:
			path = args[0]
		default:
			r.errf("usage: cd [dir]\n")
			return 2
		}
		return r.changeDir(path)
	case "wait":
		if len(args) > 0 {
			panic("wait with args not handled yet")
		}
		err := r.bgShells.Wait()
		if _, ok := IsExitStatus(err); err != nil && !ok {
			r.setErr(err)
		}
	case "builtin":
		if len(args) < 1 {
			break
		}
		if !isBuiltin(args[0]) {
			return 1
		}
		return r.builtinCode(ctx, pos, args[0], args[1:])
	case "type":
		anyNotFound := false
		for _, arg := range args {
			if als, ok := r.alias[arg]; ok && r.opts[optExpandAliases] {
				var buf bytes.Buffer
				if len(als.args) > 0 {
					printer := syntax.NewPrinter()
					printer.Print(&buf, &syntax.CallExpr{
						Args: als.args,
					})
				}
				if als.blank {
					buf.WriteByte(' ')
				}
				r.outf("%s is aliased to `%s'\n", arg, &buf)
				continue
			}
			if _, ok := r.Funcs[arg]; ok {
				r.outf("%s is a function\n", arg)
				continue
			}
			if isBuiltin(arg) {
				r.outf("%s is a shell builtin\n", arg)
				continue
			}
			if path, err := LookPath(expandEnv{r}, arg); err == nil {
				r.outf("%s is %s\n", arg, path)
				continue
			}
			r.errf("type: %s: not found\n", arg)
			anyNotFound = true
		}
		if anyNotFound {
			return 1
		}
	case "eval":
		src := strings.Join(args, " ")
		p := syntax.NewParser()
		file, err := p.Parse(strings.NewReader(src), "")
		if err != nil {
			r.errf("eval: %v\n", err)
			return 1
		}
		r.stmts(ctx, file.Stmts)
		return r.exit
	case "source", ".":
		if len(args) < 1 {
			r.errf("%v: source: need filename\n", pos)
			return 2
		}
		f, err := r.open(ctx, args[0], os.O_RDONLY, 0, false)
		if err != nil {
			r.errf("source: %v\n", err)
			return 1
		}
		defer f.Close()
		p := syntax.NewParser()
		file, err := p.Parse(f, args[0])
		if err != nil {
			r.errf("source: %v\n", err)
			return 1
		}

// Keep the current versions of some fields we might modify.
		oldParams := r.Params
		oldSourceSetParams := r.sourceSetParams
		oldInSource := r.inSource

// If we run "source file args...", set said args as parameters.
		// Otherwise, keep the current parameters.
		sourceArgs := len(args[1:]) > 0
		if sourceArgs {
			r.Params = args[1:]
			r.sourceSetParams = false
		}
		// We want to track if the sourced file explicitly sets the
		// parameters.
		r.sourceSetParams = false
		r.inSource = true // know that we're inside a sourced script.
		r.stmts(ctx, file.Stmts)

// If we modified the parameters and the sourced file didn't
		// explicitly set them, we restore the old ones.
		if sourceArgs && !r.sourceSetParams {
			r.Params = oldParams
		}
		r.sourceSetParams = oldSourceSetParams
		r.inSource = oldInSource

if code, ok := r.err.(returnStatus); ok {
			r.err = nil
			return int(code)
		}
		return r.exit
	case "[":
		if len(args) == 0 || args[len(args)-1] != "]" {
			r.errf("%v: [: missing matching ]\n", pos)
			return 2
		}
		args = args[:len(args)-1]
		fallthrough
	case "test":
		parseErr := false
		p := testParser{
			rem: args,
			err: func(err error) {
				r.errf("%v: %v\n", pos, err)
				parseErr = true
			},
		}
		p.next()
		expr := p.classicTest("[", false)
		if parseErr {
			return 2
		}
		return oneIf(r.bashTest(ctx, expr, true) == "")
	case "exec":
		// TODO: Consider unix.Exec, i.e. actually replacing
		// the process. It's in theory what a shell should do,
		// but in practice it would kill the entire Go process
		// and it's not available on Windows.
		if len(args) == 0 {
			r.keepRedirs = true
			break
		}
		r.exitShell = true
		r.exec(ctx, args)
		return r.exit
	case "command":
		show := false
		for len(args) > 0 && strings.HasPrefix(args[0], "-") {
			switch args[0] {
			case "-v":
				show = true
			default:
				r.errf("command: invalid option %s\n", args[0])
				return 2
			}
			args = args[1:]
		}
		if len(args) == 0 {
			break
		}
		if !show {
			if isBuiltin(args[0]) {
				return r.builtinCode(ctx, pos, args[0], args[1:])
			}
			r.exec(ctx, args)
			return r.exit
		}
		last := 0
		for _, arg := range args {
			last = 0
			if r.Funcs[arg] != nil || isBuiltin(arg) {
				r.outf("%s\n", arg)
			} else if path, err := exec.LookPath(arg); err == nil {
				r.outf("%s\n", path)
			} else {
				last = 1
			}
		}
		return last
	case "dirs":
		for i := len(r.dirStack) - 1; i >= 0; i-- {
			r.outf("%s", r.dirStack[i])
			if i > 0 {
				r.out(" ")
			}
		}
		r.out("\n")
	case "pushd":
		change := true
		if len(args) > 0 && args[0] == "-n" {
			change = false
			args = args[1:]
		}
		swap := func() string {
			oldtop := r.dirStack[len(r.dirStack)-1]
			top := r.dirStack[len(r.dirStack)-2]
			r.dirStack[len(r.dirStack)-1] = top
			r.dirStack[len(r.dirStack)-2] = oldtop
			return top
		}
		switch len(args) {
		case 0:
			if !change {
				break
			}
			if len(r.dirStack) < 2 {
				r.errf("pushd: no other directory\n")
				return 1
			}
			newtop := swap()
			if code := r.changeDir(newtop); code != 0 {
				return code
			}
			r.builtinCode(ctx, syntax.Pos{}, "dirs", nil)
		case 1:
			if change {
				if code := r.changeDir(args[0]); code != 0 {
					return code
				}
				r.dirStack = append(r.dirStack, r.Dir)
			} else {
				r.dirStack = append(r.dirStack, args[0])
				swap()
			}
			r.builtinCode(ctx, syntax.Pos{}, "dirs", nil)
		default:
			r.errf("pushd: too many arguments\n")
			return 2
		}
	case "popd":
		change := true
		if len(args) > 0 && args[0] == "-n" {
			change = false
			args = args[1:]
		}
		switch len(args) {
		case 0:
			if len(r.dirStack) < 2 {
				r.errf("popd: directory stack empty\n")
				return 1
			}
			oldtop := r.dirStack[len(r.dirStack)-1]
			r.dirStack = r.dirStack[:len(r.dirStack)-1]
			if change {
				newtop := r.dirStack[len(r.dirStack)-1]
				if code := r.changeDir(newtop); code != 0 {
					return code
				}
			} else {
				r.dirStack[len(r.dirStack)-1] = oldtop
			}
			r.builtinCode(ctx, syntax.Pos{}, "dirs", nil)
		default:
			r.errf("popd: invalid argument\n")
			return 2
		}
	case "return":
		if !r.inFunc && !r.inSource {
			r.errf("return: can only be done from a func or sourced script\n")
			return 1
		}
		code := 0
		switch len(args) {
		case 0:
		case 1:
			code = atoi(args[0])
		default:
			r.errf("return: too many arguments\n")
			return 2
		}
		r.setErr(returnStatus(code))
	case "read":
		raw := false
		for len(args) > 0 && strings.HasPrefix(args[0], "-") {
			switch args[0] {
			case "-r":
				raw = true
			default:
				r.errf("read: invalid option %q\n", args[0])
				return 2
			}
			args = args[1:]
		}

for _, name := range args {
			if !syntax.ValidName(name) {
				r.errf("read: invalid identifier %q\n", name)
				return 2
			}
		}

line, err := r.readLine(raw)
		if err != nil {
			return 1
		}
		if len(args) == 0 {
			args = append(args, "REPLY")
		}

values := expand.ReadFields(r.ecfg, string(line), len(args), raw)
		for i, name := range args {
			val := ""
			if i < len(values) {
				val = values[i]
			}
			r.setVar(name, nil, expand.Variable{Kind: expand.String, Str: val})
		}

return 0

case "getopts":
		if len(args) < 2 {
			r.errf("getopts: usage: getopts optstring name [arg]\n")
			return 2
		}
		optind, _ := strconv.Atoi(r.envGet("OPTIND"))
		if optind-1 != r.optState.argidx {
			if optind < 1 {
				optind = 1
			}
			r.optState = getopts{argidx: optind - 1}
		}
		optstr := args[0]
		name := args[1]
		if !syntax.ValidName(name) {
			r.errf("getopts: invalid identifier: %q\n", name)
			return 2
		}
		args = args[2:]
		if len(args) == 0 {
			args = r.Params
		}
		diagnostics := !strings.HasPrefix(optstr, ":")

opt, optarg, done := r.optState.Next(optstr, args)

r.setVarString(name, string(opt))
		r.delVar("OPTARG")
		switch {
		case opt == '?' && diagnostics && !done:
			r.errf("getopts: illegal option -- %q\n", optarg)
		case opt == ':' && diagnostics:
			r.errf("getopts: option requires an argument -- %q\n", optarg)
		default:
			if optarg != "" {
				r.setVarString("OPTARG", optarg)
			}
		}
		if optind-1 != r.optState.argidx {
			r.setVarString("OPTIND", strconv.FormatInt(int64(r.optState.argidx+1), 10))
		}

return oneIf(done)

case "shopt":
		mode := ""
		posixOpts := false
		for len(args) > 0 && strings.HasPrefix(args[0], "-") {
			switch args[0] {
			case "-s", "-u":
				mode = args[0]
			case "-o":
				posixOpts = true
			case "-p", "-q":
				panic(fmt.Sprintf("unhandled shopt flag: %s", args[0]))
			default:
				r.errf("shopt: invalid option %q\n", args[0])
				return 2
			}
			args = args[1:]
		}
		if len(args) == 0 {
			if !posixOpts {
				for i, name := range bashOptsTable {
					r.printOptLine(name, r.opts[len(shellOptsTable)+i])
				}
				break
			}
			for i, opt := range &shellOptsTable {
				r.printOptLine(opt.name, r.opts[i])
			}
			break
		}
		for _, arg := range args {
			opt := r.optByName(arg, !posixOpts)
			if opt == nil {
				r.errf("shopt: invalid option name %q\n", arg)
				return 1
			}
			switch mode {
			case "-s", "-u":
				*opt = mode == "-s"
			default: // ""
				r.printOptLine(arg, *opt)
			}
		}
		r.updateExpandOpts()

case "alias":
		show := func(name string, als alias) {
			var buf bytes.Buffer
			if len(als.args) > 0 {
				printer := syntax.NewPrinter()
				printer.Print(&buf, &syntax.CallExpr{
					Args: als.args,
				})
			}
			if als.blank {
				buf.WriteByte(' ')
			}
			r.outf("alias %s='%s'\n", name, &buf)
		}

if len(args) == 0 {
			for name, als := range r.alias {
				show(name, als)
			}
		}
		for _, name := range args {
			i := strings.IndexByte(name, '=')
			if i < 1 { // don't save an empty name
				als, ok := r.alias[name]
				if !ok {
					r.errf("alias: %q not found\n", name)
					continue
				}
				show(name, als)
				continue
			}

// TODO: parse any CallExpr perhaps, or even any Stmt
			parser := syntax.NewParser()
			var words []*syntax.Word
			src := name[i+1:]
			if err := parser.Words(strings.NewReader(src), func(w *syntax.Word) bool {
				words = append(words, w)
				return true
			}); err != nil {
				r.errf("alias: could not parse %q: %v", src, err)
				continue
			}

name = name[:i]
			if r.alias == nil {
				r.alias = make(map[string]alias)
			}
			r.alias[name] = alias{
				args:  words,
				blank: strings.TrimRight(src, " \t") != src,
			}
		}
	case "unalias":
		for _, name := range args {
			delete(r.alias, name)
		}

default:
		// "trap", "umask", "fg", "bg",
		panic(fmt.Sprintf("unhandled builtin: %s", name))
	}
	return 0
}

func (r *Runner) printOptLine(name string, enabled bool) {
	status := "off"
	if enabled {
		status = "on"
	}
	r.outf("%s\t%s\n", name, status)
}

func (r *Runner) readLine(raw bool) ([]byte, error) {
	var line []byte
	esc := false

for {
		var buf [1]byte
		n, err := r.stdin.Read(buf[:])
		if n > 0 {
			b := buf[0]
			switch {
			case !raw && b == '\\':
				line = append(line, b)
				esc = !esc
			case !raw && b == '\n' && esc:
				// line continuation
				line = line[len(line)-1:]
				esc = false
			case b == '\n':
				return line, nil
			default:
				line = append(line, b)
				esc = false
			}
		}
		if err == io.EOF && len(line) > 0 {
			return line, nil
		}
		if err != nil {
			return nil, err
		}
	}
}

func (r *Runner) changeDir(path string) int {
	path = r.absPath(path)
	info, err := r.stat(path)
	if err != nil || !info.IsDir() {
		return 1
	}
	if !hasPermissionToDir(info) {
		return 1
	}
	r.Dir = path
	r.Vars["OLDPWD"] = r.Vars["PWD"]
	r.Vars["PWD"] = expand.Variable{Kind: expand.String, Str: path}
	return 0
}

func (r *Runner) absPath(path string) string {
	if !filepath.IsAbs(path) {
		path = filepath.Join(r.Dir, path)
	}
	return filepath.Clean(path)
}

type getopts struct {
	argidx  int
	runeidx int
}

func (g *getopts) Next(optstr string, args []string) (opt rune, optarg string, done bool) {
	if len(args) == 0 || g.argidx >= len(args) {
		return '?', "", true
	}
	arg := []rune(args[g.argidx])
	if len(arg) < 2 || arg[0] != '-' || arg[1] == '-' {
		return '?', "", true
	}

opts := arg[1:]
	opt = opts[g.runeidx]
	if g.runeidx+1 < len(opts) {
		g.runeidx++
	} else {
		g.argidx++
		g.runeidx = 0
	}

i := strings.IndexRune(optstr, opt)
	if i < 0 {
		// invalid option
		return '?', string(opt), false
	}

if i+1 < len(optstr) && optstr[i+1] == ':' {
		if g.argidx >= len(args) {
			// missing argument
			return ':', string(opt), false
		}
		optarg = args[g.argidx]
		g.argidx++
		g.runeidx = 0
	}

return opt, optarg, false
}
0707010000003E000081A4000003E800000064000000016046124D000007B5000000000000000000000000000000000000002000000000sh-3.2.4/interp/example_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp_test

import (
	"context"
	"fmt"
	"io"
	"os"
	"runtime"
	"strings"
	"time"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/interp"
	"mvdan.cc/sh/v3/syntax"
)

func Example() {
	src := `
		foo=abc
		for i in 1 2 3; do
			foo+=$i
		done
		let bar=(2 + 3)
		echo $foo $bar
		echo $GLOBAL
	`
	file, _ := syntax.NewParser().Parse(strings.NewReader(src), "")
	runner, _ := interp.New(
		interp.Env(expand.ListEnviron("GLOBAL=global_value")),
		interp.StdIO(nil, os.Stdout, os.Stdout),
	)
	runner.Run(context.TODO(), file)
	// Output:
	// abc123 5
	// global_value
}

func ExampleExecHandler() {
	src := "echo foo; join ! foo bar baz; missing-program bar"
	file, _ := syntax.NewParser().Parse(strings.NewReader(src), "")

exec := func(ctx context.Context, args []string) error {
		hc := interp.HandlerCtx(ctx)

if args[0] == "join" {
			fmt.Fprintln(hc.Stdout, strings.Join(args[2:], args[1]))
			return nil
		}

if _, err := interp.LookPath(hc.Env, args[0]); err != nil {
			fmt.Printf("%s is not installed\n", args[0])
			return interp.NewExitStatus(1)
		}

return interp.DefaultExecHandler(2*time.Second)(ctx, args)
	}
	runner, _ := interp.New(
		interp.StdIO(nil, os.Stdout, os.Stdout),
		interp.ExecHandler(exec),
	)
	runner.Run(context.TODO(), file)
	// Output:
	// foo
	// foo!bar!baz
	// missing-program is not installed
}

func ExampleOpenHandler() {
	src := "echo foo; echo bar >/dev/null"
	file, _ := syntax.NewParser().Parse(strings.NewReader(src), "")

open := func(ctx context.Context, path string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {
		if runtime.GOOS == "windows" && path == "/dev/null" {
			path = "NUL"
		}
		return interp.DefaultOpenHandler()(ctx, path, flag, perm)
	}
	runner, _ := interp.New(
		interp.StdIO(nil, os.Stdout, os.Stdout),
		interp.OpenHandler(open),
	)
	runner.Run(context.TODO(), file)
	// Output:
	// foo
}
0707010000003F000081A4000003E800000064000000016046124D00001EA4000000000000000000000000000000000000001B00000000sh-3.2.4/interp/handler.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"context"
	"fmt"
	"io"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strings"
	"syscall"
	"time"

"mvdan.cc/sh/v3/expand"
)

// HandlerCtx returns HandlerContext value stored in ctx.
// It panics if ctx has no HandlerContext stored.
func HandlerCtx(ctx context.Context) HandlerContext {
	hc, ok := ctx.Value(handlerCtxKey{}).(HandlerContext)
	if !ok {
		panic("interp.HandlerCtx: no HandlerContext in ctx")
	}
	return hc
}

type handlerCtxKey struct{}

// HandlerContext is the data passed to all the handler functions via a context value.
// It contains some of the current state of the Runner.
type HandlerContext struct {
	// Env is a read-only version of the interpreter's environment,
	// including environment variables, global variables, and local function
	// variables.
	Env expand.Environ

// Dir is the interpreter's current directory.
	Dir string

// Stdin is the interpreter's current standard input reader.
	Stdin io.Reader
	// Stdout is the interpreter's current standard output writer.
	Stdout io.Writer
	// Stderr is the interpreter's current standard error writer.
	Stderr io.Writer
}

// ExecHandlerFunc is a handler which executes simple command. It is
// called for all CallExpr nodes where the first argument is neither a
// declared function nor a builtin.
//
// Returning nil error sets commands exit status to 0. Other exit statuses
// can be set with NewExitStatus. Any other error will halt an interpreter.
type ExecHandlerFunc func(ctx context.Context, args []string) error

// DefaultExecHandler returns an ExecHandlerFunc used by default.
// It finds binaries in PATH and executes them.
// When context is cancelled, interrupt signal is sent to running processes.
// KillTimeout is a duration to wait before sending kill signal.
// A negative value means that a kill signal will be sent immediately.
// On Windows, the kill signal is always sent immediately,
// because Go doesn't currently support sending Interrupt on Windows.
// Runner.New sets killTimeout to 2 seconds by default.
func DefaultExecHandler(killTimeout time.Duration) ExecHandlerFunc {
	return func(ctx context.Context, args []string) error {
		hc := HandlerCtx(ctx)
		path, err := LookPath(hc.Env, args[0])
		if err != nil {
			fmt.Fprintln(hc.Stderr, err)
			return NewExitStatus(127)
		}
		cmd := exec.Cmd{
			Path:   path,
			Args:   args,
			Env:    execEnv(hc.Env),
			Dir:    hc.Dir,
			Stdin:  hc.Stdin,
			Stdout: hc.Stdout,
			Stderr: hc.Stderr,
		}

err = cmd.Start()
		if err == nil {
			if done := ctx.Done(); done != nil {
				go func() {
					<-done

if killTimeout <= 0 || runtime.GOOS == "windows" {
						_ = cmd.Process.Signal(os.Kill)
						return
					}

// TODO: don't temporarily leak this goroutine
					// if the program stops itself with the
					// interrupt.
					go func() {
						time.Sleep(killTimeout)
						_ = cmd.Process.Signal(os.Kill)
					}()
					_ = cmd.Process.Signal(os.Interrupt)
				}()
			}

err = cmd.Wait()
		}

switch x := err.(type) {
		case *exec.ExitError:
			// started, but errored - default to 1 if OS
			// doesn't have exit statuses
			if status, ok := x.Sys().(syscall.WaitStatus); ok {
				if status.Signaled() {
					if ctx.Err() != nil {
						return ctx.Err()
					}
					return NewExitStatus(uint8(128 + status.Signal()))
				}
				return NewExitStatus(uint8(status.ExitStatus()))
			}
			return NewExitStatus(1)
		case *exec.Error:
			// did not start
			fmt.Fprintf(hc.Stderr, "%v\n", err)
			return NewExitStatus(127)
		default:
			return err
		}
	}
}

func checkStat(dir, file string) (string, error) {
	if !filepath.IsAbs(file) {
		file = filepath.Join(dir, file)
	}
	info, err := os.Stat(file)
	if err != nil {
		return "", err
	}
	m := info.Mode()
	if m.IsDir() {
		return "", fmt.Errorf("is a directory")
	}
	if runtime.GOOS != "windows" && m&0o111 == 0 {
		return "", fmt.Errorf("permission denied")
	}
	return file, nil
}

func winHasExt(file string) bool {
	i := strings.LastIndex(file, ".")
	if i < 0 {
		return false
	}
	return strings.LastIndexAny(file, `:\/`) < i
}

func findExecutable(dir, file string, exts []string) (string, error) {
	if len(exts) == 0 {
		// non-windows
		return checkStat(dir, file)
	}
	if winHasExt(file) {
		if file, err := checkStat(dir, file); err == nil {
			return file, nil
		}
	}
	for _, e := range exts {
		f := file + e
		if f, err := checkStat(dir, f); err == nil {
			return f, nil
		}
	}
	return "", fmt.Errorf("not found")
}

func driveLetter(c byte) bool {
	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
}

// splitList is like filepath.SplitList, but always using the unix path
// list separator ':'. On Windows, it also makes sure not to split
// [A-Z]:[/\].
func splitList(path string) []string {
	if path == "" {
		return []string{""}
	}
	list := strings.Split(path, ":")
	if runtime.GOOS != "windows" {
		return list
	}
	// join "C", "/foo" into "C:/foo"
	var fixed []string
	for i := 0; i < len(list); i++ {
		s := list[i]
		switch {
		case len(s) != 1, !driveLetter(s[0]):
		case i+1 >= len(list):
			// last element
		case strings.IndexAny(list[i+1], `/\`) != 0:
			// next element doesn't start with / or \
		default:
			fixed = append(fixed, s+":"+list[i+1])
			i++
			continue
		}
		fixed = append(fixed, s)
	}
	return fixed
}

// LookPath is similar to os/exec.LookPath, with the difference that it uses the
// provided environment. env is used to fetch relevant environment variables
// such as PWD and PATH.
//
// If no error is returned, the returned path must be valid.
func LookPath(env expand.Environ, file string) (string, error) {
	pathList := splitList(env.Get("PATH").String())
	chars := `/`
	if runtime.GOOS == "windows" {
		chars = `:\/`
		// so that "foo" always tries "./foo"
		pathList = append([]string{"."}, pathList...)
	}
	exts := pathExts(env)
	dir := env.Get("PWD").String()
	if strings.ContainsAny(file, chars) {
		return findExecutable(dir, file, exts)
	}
	for _, elem := range pathList {
		var path string
		switch elem {
		case "", ".":
			// otherwise "foo" won't be "./foo"
			path = "." + string(filepath.Separator) + file
		default:
			path = filepath.Join(elem, file)
		}
		if f, err := findExecutable(dir, path, exts); err == nil {
			return f, nil
		}
	}
	return "", fmt.Errorf("%q: executable file not found in $PATH", file)
}

func pathExts(env expand.Environ) []string {
	if runtime.GOOS != "windows" {
		return nil
	}
	pathext := env.Get("PATHEXT").String()
	if pathext == "" {
		return []string{".com", ".exe", ".bat", ".cmd"}
	}
	var exts []string
	for _, e := range strings.Split(strings.ToLower(pathext), `;`) {
		if e == "" {
			continue
		}
		if e[0] != '.' {
			e = "." + e
		}
		exts = append(exts, e)
	}
	return exts
}

// OpenHandlerFunc is a handler which opens files. It is
// called for all files that are opened directly by the shell, such as
// in redirects. Files opened by executed programs are not included.
//
// The path parameter may be relative to the current directory, which can be
// fetched via HandlerCtx.
//
// Use a return error of type *os.PathError to have the error printed to
// stderr and the exit status set to 1. If the error is of any other type, the
// interpreter will come to a stop.
type OpenHandlerFunc func(ctx context.Context, path string, flag int, perm os.FileMode) (io.ReadWriteCloser, error)

// DefaultOpenHandler returns an OpenHandlerFunc used by default. It uses os.OpenFile to open files.
func DefaultOpenHandler() OpenHandlerFunc {
	return func(ctx context.Context, path string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {
		mc := HandlerCtx(ctx)
		if !filepath.IsAbs(path) {
			path = filepath.Join(mc.Dir, path)
		}
		return os.OpenFile(path, flag, perm)
	}
}
07070100000040000081A4000003E800000064000000016046124D00001A87000000000000000000000000000000000000002000000000sh-3.2.4/interp/handler_test.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"bufio"
	"bytes"
	"context"
	"fmt"
	"io"
	"os"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"testing"
	"time"

"mvdan.cc/sh/v3/syntax"
)

func blacklistBuiltinExec(name string) ExecHandlerFunc {
	return func(ctx context.Context, args []string) error {
		if args[0] == name {
			return fmt.Errorf("%s: blacklisted builtin", name)
		}
		return testExecHandler(ctx, args)
	}
}

func blacklistAllExec(ctx context.Context, args []string) error {
	return fmt.Errorf("blacklisted: %s", args[0])
}

func blacklistNondevOpen(ctx context.Context, path string, flags int, mode os.FileMode) (io.ReadWriteCloser, error) {
	if path != "/dev/null" {
		return nil, fmt.Errorf("non-dev: %s", path)
	}

return testOpenHandler(ctx, path, flags, mode)
}

// runnerCtx allows us to give handler functions access to the Runner, if needed.
var runnerCtx = new(int)

func execBuiltin(ctx context.Context, args []string) error {
	runner, ok := ctx.Value(runnerCtx).(*Runner)
	if ok && runner.Exited() {
		return fmt.Errorf("exec builtin: %s", args[0])
	}
	return nil
}

func TestRunnerHandlers(t *testing.T) {
	t.Parallel()
	p := syntax.NewParser()
	for _, tc := range modCases {
		t.Run(tc.name, func(t *testing.T) {
			file := parse(t, p, tc.src)
			var cb concBuffer
			r, err := New(StdIO(nil, &cb, &cb))
			if tc.exec != nil {
				ExecHandler(tc.exec)(r)
			}
			if tc.open != nil {
				OpenHandler(tc.open)(r)
			}
			if err != nil {
				t.Fatal(err)
			}
			ctx := context.WithValue(context.Background(), runnerCtx, r)
			if err := r.Run(ctx, file); err != nil {
				cb.WriteString(err.Error())
			}
			got := cb.String()
			if got != tc.want {
				t.Fatalf("want:\n%s\ngot:\n%s", tc.want, got)
			}
		})
	}
}

type readyBuffer struct {
	buf       bytes.Buffer
	seenReady sync.WaitGroup
}

func (b *readyBuffer) Write(p []byte) (n int, err error) {
	if string(p) == "ready\n" {
		b.seenReady.Done()
		return len(p), nil
	}
	return b.buf.Write(p)
}

func TestKillTimeout(t *testing.T) {
	if testing.Short() {
		t.Skip("sleeps and timeouts are slow")
	}
	if runtime.GOOS == "windows" {
		t.Skip("skipping trap tests on windows")
	}
	tests := []struct {
		src         string
		want        string
		killTimeout time.Duration
		forcedKill  bool
	}{
		// killed immediately
		{
			`sh -c "trap 'echo trapped; exit 0' INT; echo ready; for i in \$(seq 1 100); do sleep 0.01; done"`,
			"",
			-1,
			true,
		},
		// interrupted first, and stops itself in time
		{
			`sh -c "trap 'echo trapped; exit 0' INT; echo ready; for i in \$(seq 1 100); do sleep 0.01; done"`,
			"trapped\n",
			time.Second,
			false,
		},
		// interrupted first, but does not stop itself in time
		{
			`sh -c "trap 'echo trapped; for i in \$(seq 1 100); do sleep 0.01; done' INT; echo ready; for i in \$(seq 1 100); do sleep 0.01; done"`,
			"trapped\n",
			20 * time.Millisecond,
			true,
		},
	}

for i := range tests {
		test := tests[i]
		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
			t.Parallel()
			file := parse(t, nil, test.src)
			attempt := 0
			for {
				var rbuf readyBuffer
				rbuf.seenReady.Add(1)
				ctx, cancel := context.WithCancel(context.Background())
				r, err := New(
					StdIO(nil, &rbuf, &rbuf),
					ExecHandler(DefaultExecHandler(test.killTimeout)),
				)
				if err != nil {
					t.Fatal(err)
				}
				go func() {
					rbuf.seenReady.Wait()
					cancel()
				}()
				err = r.Run(ctx, file)
				if test.forcedKill {
					if _, ok := IsExitStatus(err); ok || err == nil {
						t.Error("command was not force-killed")
					}
				} else {
					if err != nil && err != context.Canceled && err != context.DeadlineExceeded {
						t.Errorf("execution errored: %v", err)
					}
				}
				got := rbuf.buf.String()
				if got != test.want {
					if attempt < 3 && got == "" && test.killTimeout > 0 {
						attempt++
						test.killTimeout *= 2
						continue
					}
					t.Fatalf("want:\n%s\ngot:\n%s", test.want, got)
				}
				break
			}
		})
	}
}

func TestKillSignal(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("skipping signal tests on windows")
	}
	tests := []struct {
		signal os.Signal
		want   error
	}{
		{syscall.SIGINT, NewExitStatus(130)},  // 128 + 2
		{syscall.SIGKILL, NewExitStatus(137)}, // 128 + 9
		{syscall.SIGTERM, NewExitStatus(143)}, // 128 + 15
	}

// pid_and_hang is implemented in TestMain; we use it to have the
	// interpreter spawn a process, and easily grab its PID to send it a
	// signal directly. The program prints its PID and hangs forever.
	file := parse(t, nil, "GOSH_CMD=pid_and_hang $GOSH_PROG")
	for i := range tests {
		test := tests[i]
		t.Run(fmt.Sprintf("signal-%d", test.signal), func(t *testing.T) {
			t.Parallel()

ctx, cancel := context.WithTimeout(context.Background(), time.Second)
			defer cancel()

outReader, outWriter := io.Pipe()
			stderr := new(bytes.Buffer)
			r, _ := New(StdIO(nil, outWriter, stderr))
			errch := make(chan error, 1)
			go func() {
				errch <- r.Run(ctx, file)
				outWriter.Close()
			}()

br := bufio.NewReader(outReader)
			line, err := br.ReadString('\n')
			if err != nil {
				t.Fatal(err)
			}
			pid, err := strconv.Atoi(strings.TrimSpace(line))
			if err != nil {
				t.Fatal(err)
			}

proc, err := os.FindProcess(pid)
			if err != nil {
				t.Fatal(err)
			}
			if err := proc.Signal(test.signal); err != nil {
				t.Fatal(err)
			}
			if got := <-errch; got != test.want {
				t.Fatalf("want error %v, got %v. stderr: %s", test.want, got, stderr)
			}
		})
	}
}
07070100000041000081A4000003E800000064000000016046124D0001210A000000000000000000000000000000000000001F00000000sh-3.2.4/interp/interp_test.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"io/ioutil"
	"math/bits"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"testing"
	"time"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

// Some program which should be in $PATH.  Needs to run before runTests is
// initialized (so an init function wouldn't work), because runTest uses it.
var pathProg = func() string {
	if runtime.GOOS == "windows" {
		return "cmd"
	}
	return "sh"
}()

func parse(tb testing.TB, parser *syntax.Parser, src string) *syntax.File {
	if parser == nil {
		parser = syntax.NewParser()
	}
	file, err := parser.Parse(strings.NewReader(src), "")
	if err != nil {
		tb.Fatal(err)
	}
	return file
}

func BenchmarkRun(b *testing.B) {
	b.ReportAllocs()
	b.StopTimer()
	src := `
echo a b c d
echo ./$foo/etc $(echo foo bar)
foo="bar"
x=y :
fn() {
	local a=b
	for i in 1 2 3; do
		echo $i | cat
	done
}
[[ $foo == bar ]] && fn
echo a{b,c}d *.go
let i=(2 + 3)
`
	file := parse(b, nil, src)
	r, _ := New()
	ctx := context.Background()
	b.StartTimer()
	for i := 0; i < b.N; i++ {
		r.Reset()
		if err := r.Run(ctx, file); err != nil {
			b.Fatal(err)
		}
	}
}

var hasBash50 bool

func TestMain(m *testing.M) {
	if os.Getenv("GOSH_PROG") != "" {
		switch os.Getenv("GOSH_CMD") {
		case "pid_and_hang":
			fmt.Println(os.Getpid())
			time.Sleep(time.Hour)
		}
		r := strings.NewReader(os.Args[1])
		file, err := syntax.NewParser().Parse(r, "")
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}
		runner, _ := New(
			StdIO(os.Stdin, os.Stdout, os.Stderr),
			OpenHandler(testOpenHandler),
			ExecHandler(testExecHandler),
		)
		ctx := context.Background()
		if err := runner.Run(ctx, file); err != nil {
			if status, ok := IsExitStatus(err); ok {
				os.Exit(int(status))
			}

fmt.Fprintln(os.Stderr, err)
			os.Exit(1)
		}

os.Exit(0)
	}
	prog, err := os.Executable()
	if err != nil {
		panic(err)
	}
	os.Setenv("GOSH_PROG", prog)

os.Setenv("LANGUAGE", "en_US.UTF-8")
	os.Setenv("LC_ALL", "en_US.UTF-8")
	os.Unsetenv("CDPATH")
	hasBash50 = checkBash()
	os.Setenv("INTERP_GLOBAL", "value")
	os.Setenv("MULTILINE_INTERP_GLOBAL", "\nwith\nnewlines\n\n")

// Double check that env vars on Windows are case insensitive.
	if runtime.GOOS == "windows" {
		os.Setenv("mixedCase_INTERP_GLOBAL", "value")
	} else {
		os.Setenv("MIXEDCASE_INTERP_GLOBAL", "value")
	}

os.Setenv("PATH_PROG", pathProg)

// To print env vars. Only a builtin on Windows.
	if runtime.GOOS == "windows" {
		os.Setenv("ENV_PROG", "cmd /c set")
	} else {
		os.Setenv("ENV_PROG", "env")
	}

for _, s := range []string{"a", "b", "c", "d", "foo", "bar"} {
		os.Unsetenv(s)
	}
	exit := m.Run()
	os.Exit(exit)
}

func checkBash() bool {
	out, err := exec.Command("bash", "-c", "echo -n $BASH_VERSION").Output()
	if err != nil {
		return false
	}
	return strings.HasPrefix(string(out), "5.0")
}

// concBuffer wraps a bytes.Buffer in a mutex so that concurrent writes
// to it don't upset the race detector.
type concBuffer struct {
	buf bytes.Buffer
	sync.Mutex
}

func absPath(dir, path string) string {
	if !filepath.IsAbs(path) {
		path = filepath.Join(dir, path)
	}
	return filepath.Clean(path)
}

func (c *concBuffer) Write(p []byte) (int, error) {
	c.Lock()
	n, err := c.buf.Write(p)
	c.Unlock()
	return n, err
}

func (c *concBuffer) WriteString(s string) (int, error) {
	c.Lock()
	n, err := c.buf.WriteString(s)
	c.Unlock()
	return n, err
}

func (c *concBuffer) String() string {
	c.Lock()
	s := c.buf.String()
	c.Unlock()
	return s
}

func (c *concBuffer) Reset() {
	c.Lock()
	c.buf.Reset()
	c.Unlock()
}

type runTest struct {
	in, want string
}

var runTests = []runTest{
	// no-op programs
	{"", ""},
	{"true", ""},
	{":", ""},
	{"exit", ""},
	{"exit 0", ""},
	{"{ :; }", ""},
	{"(:)", ""},

// exit status codes
	{"exit 1", "exit status 1"},
	{"exit -1", "exit status 255"},
	{"exit 300", "exit status 44"},
	{"false", "exit status 1"},
	{"false foo", "exit status 1"},
	{"! false", ""},
	{"true foo", ""},
	{": foo", ""},
	{"! true", "exit status 1"},
	{"false; true", ""},
	{"false; exit", "exit status 1"},
	{"exit; echo foo", ""},
	{"exit 0; echo foo", ""},
	{"printf", "usage: printf format [arguments]\nexit status 2 #JUSTERR"},
	{"break", "break is only useful in a loop #JUSTERR"},
	{"continue", "continue is only useful in a loop #JUSTERR"},
	{"cd a b", "usage: cd [dir]\nexit status 2 #JUSTERR"},
	{"shift a", "usage: shift [n]\nexit status 2 #JUSTERR"},
	{
		"shouldnotexist",
		"\"shouldnotexist\": executable file not found in $PATH\nexit status 127 #JUSTERR",
	},
	{
		"for i in 1; do continue a; done",
		"usage: continue [n]\nexit status 2 #JUSTERR",
	},
	{
		"for i in 1; do break a; done",
		"usage: break [n]\nexit status 2 #JUSTERR",
	},
	{"false; a=b", ""},
	{"false; false &", ""},

// we don't need to follow bash error strings
	{"exit a", "invalid exit status code: \"a\"\nexit status 2 #JUSTERR"},
	{"exit 1 2", "exit cannot take multiple arguments\nexit status 1 #JUSTERR"},

// echo
	{"echo", "\n"},
	{"echo a b c", "a b c\n"},
	{"echo -n foo", "foo"},
	{`echo -e '\t'`, "\t\n"},
	{`echo -E '\t'`, "\\t\n"},
	{"echo -x foo", "-x foo\n"},
	{"echo -e -x -e foo", "-x -e foo\n"},

// printf
	{"printf foo", "foo"},
	{"printf %%", "%"},
	{"printf %", "missing format char\nexit status 1 #JUSTERR"},
	{"printf %; echo foo", "missing format char\nfoo\n #IGNORE"},
	{"printf %1", "missing format char\nexit status 1 #JUSTERR"},
	{"printf %+", "missing format char\nexit status 1 #JUSTERR"},
	{"printf %B foo", "invalid format char: B\nexit status 1 #JUSTERR"},
	{"printf %12-s foo", "invalid format char: -\nexit status 1 #JUSTERR"},
	{"printf ' %s \n' bar", " bar \n"},
	{"printf '\\A'", "\\A"},
	{"printf %s foo", "foo"},
	{"printf %s", ""},
	{"printf %d,%i 3 4", "3,4"},
	{"printf %d", "0"},
	{"printf %d,%d 010 0x10", "8,16"},
	{"printf %c,%c,%c foo àa", "f,\xc3,\x00"}, // TODO: use a rune?
	{"printf %3s a", "  a"},
	{"printf %3i 1", "  1"},
	{"printf %+i%+d 1 -3", "+1-3"},
	{"printf %-5x 10", "a    "},
	{"printf %02x 1", "01"},
	{"printf 'a% 5s' a", "a    a"},
	{"printf 'nofmt' 1 2 3", "nofmt"},
	{"printf '%d_' 1 2 3", "1_2_3_"},
	{"printf '%02d %02d\n' 1 2 3", "01 02\n03 00\n"},

// words and quotes
	{"echo  foo ", "foo\n"},
	{"echo ' foo '", " foo \n"},
	{`echo " foo "`, " foo \n"},
	{`echo a'b'c"d"e`, "abcde\n"},
	{`a=" b c "; echo $a`, "b c\n"},
	{`a=" b c "; echo "$a"`, " b c \n"},
	{`echo "$(echo ' b c ')"`, " b c \n"},
	{"echo ''", "\n"},
	{`$(echo)`, ""},
	{`echo -n '\\'`, `\\`},
	{`echo -n "\\"`, `\`},
	{`set -- a b c; x="$@"; echo "$x"`, "a b c\n"},
	{`set -- b c; echo a"$@"d`, "ab cd\n"},
	{`count() { echo $#; }; set --; count "$@"`, "0\n"},
	{`count() { echo $#; }; set -- ""; count "$@"`, "1\n"},
	{`count() { echo $#; }; set -- ""; shift; count "$@"`, "0\n"},
	{`count() { echo $#; }; a=(); count "${a[@]}"`, "0\n"},
	{`count() { echo $#; }; a=(""); count "${a[@]}"`, "1\n"},
	{`echo $1 $3; set -- a b c; echo $1 $3`, "\na c\n"},
	{`[[ $0 == "bash" || $0 == "gosh" ]]`, ""},

// dollar quotes
	{`echo $'foo\nbar'`, "foo\nbar\n"},
	{`echo $'\r\t\\'`, "\r\t\\\n"},
	{`echo $"foo\nbar"`, "foo\\nbar\n"},
	{`echo $'%s'`, "%s\n"},
	{`a=$'\r\t\\'; echo "$a"`, "\r\t\\\n"},
	{`a=$"foo\nbar"; echo "$a"`, "foo\\nbar\n"},
	{`echo $'\a\b\e\E\f\v'`, "\a\b\x1b\x1b\f\v\n"},
	{`echo $'\\\'\"\?'`, "\\'\"?\n"},
	{`echo $'\1\45\12345\777\9'`, "\x01%S45\xff\\9\n"},
	{`echo $'\x\xf\x09\xAB'`, "\\x\x0f\x09\xab\n"},
	{`echo $'\u\uf\u09\uABCD\u00051234'`, "\\u\u000f\u0009\uabcd\u00051234\n"},
	{`echo $'\U\Uf\U09\UABCD\U00051234'`, "\\U\u000f\u0009\uabcd\U00051234\n"},

// escaped chars
	{"echo a\\b", "ab\n"},
	{"echo a\\ b", "a b\n"},
	{"echo \\$a", "$a\n"},
	{"echo \"a\\b\"", "a\\b\n"},
	{"echo 'a\\b'", "a\\b\n"},
	{"echo \"a\\\nb\"", "ab\n"},
	{"echo 'a\\\nb'", "a\\\nb\n"},
	{`echo "\""`, "\"\n"},
	{`echo \\`, "\\\n"},
	{`echo \\\\`, "\\\\\n"},
	{`echo \`, "\n"},

// vars
	{"foo=bar; echo $foo", "bar\n"},
	{"foo=bar foo=etc; echo $foo", "etc\n"},
	{"foo=bar; foo=etc; echo $foo", "etc\n"},
	{"foo=bar; foo=; echo $foo", "\n"},
	{"unset foo; echo $foo", "\n"},
	{"foo=bar; unset foo; echo $foo", "\n"},
	{"echo $INTERP_GLOBAL", "value\n"},
	{"INTERP_GLOBAL=; echo $INTERP_GLOBAL", "\n"},
	{"unset INTERP_GLOBAL; echo $INTERP_GLOBAL", "\n"},
	{"echo $MIXEDCASE_INTERP_GLOBAL", "value\n"},
	{"foo=bar; foo=x true; echo $foo", "bar\n"},
	{"foo=bar; foo=x true; echo $foo", "bar\n"},
	{"foo=bar; $ENV_PROG | grep '^foo='", "exit status 1"},
	{"foo=bar $ENV_PROG | grep '^foo='", "foo=bar\n"},
	{"foo=a foo=b $ENV_PROG | grep '^foo='", "foo=b\n"},
	{"$ENV_PROG | grep '^INTERP_GLOBAL='", "INTERP_GLOBAL=value\n"},
	{"INTERP_GLOBAL=new; $ENV_PROG | grep '^INTERP_GLOBAL='", "INTERP_GLOBAL=new\n"},
	{"INTERP_GLOBAL=; $ENV_PROG | grep '^INTERP_GLOBAL='", "INTERP_GLOBAL=\n"},
	{"unset INTERP_GLOBAL; $ENV_PROG | grep '^INTERP_GLOBAL='", "exit status 1"},
	{"a=b; a+=c x+=y; echo $a $x", "bc y\n"},
	{`a=" x  y"; b=$a c="$a"; echo $b; echo $c`, "x y\nx y\n"},
	{`a=" x  y"; b=$a c="$a"; echo "$b"; echo "$c"`, " x  y\n x  y\n"},
	// TODO: reenable once we figure out the broken pipe error
	//{`$ENV_PROG | while read line; do if test -z "$line"; then echo empty; fi; break; done`, ""}, // never begin with an empty element

// special vars
	{"echo $?; false; echo $?", "0\n1\n"},
	{"for i in 1 2; do\necho $LINENO\necho $LINENO\ndone", "2\n3\n2\n3\n"},
	{"[[ -n $$ && $$ -gt 0 ]]", ""},
	{"[[ $$ -eq $PPID ]]", "exit status 1"},

// var manipulation
	{"echo ${#a} ${#a[@]}", "0 0\n"},
	{"a=bar; echo ${#a} ${#a[@]}", "3 1\n"},
	{"a=世界; echo ${#a}", "2\n"},
	{"a=(a bcd); echo ${#a} ${#a[@]} ${#a[*]} ${#a[1]}", "1 2 2 3\n"},
	{"set -- a bc; echo ${#@} ${#*} $#", "2 2 2\n"},
	{
		"echo ${!a}; echo more",
		"invalid indirect expansion\nexit status 1 #JUSTERR",
	},
	{
		"a=b; echo ${!a}; b=c; echo ${!a}",
		"\nc\n",
	},
	{
		"a=foo; echo ${a:1}; echo ${a: -1}; echo ${a: -10}; echo ${a:5}",
		"oo\no\n\n\n",
	},
	{
		"a=foo; echo ${a::2}; echo ${a::-1}; echo ${a: -10}; echo ${a::5}",
		"fo\nfo\n\nfoo\n",
	},
	{
		"a=abc; echo ${a:1:1}",
		"b\n",
	},
	{
		"a=foo; echo ${a/no/x} ${a/o/i} ${a//o/i} ${a/fo/}",
		"foo fio fii o\n",
	},
	{
		"a=foo; echo ${a/*/xx} ${a//?/na} ${a/o*}",
		"xx nanana f\n",
	},
	{
		"a=12345; echo ${a//[42]} ${a//[^42]} ${a//[!42]}",
		"135 24 24\n",
	},
	{"a=0123456789; echo ${a//[1-35-8]}", "049\n"},
	{"a=]abc]; echo ${a//[]b]}", "ac\n"},
	{"a=-abc-; echo ${a//[-b]}", "ac\n"},
	{`a='x\y'; echo ${a//\\}`, "xy\n"},
	{"a=']'; echo ${a//[}", "]\n"},
	{"a=']'; echo ${a//[]}", "]\n"},
	{"a=']'; echo ${a//[]]}", "\n"},
	{"a='['; echo ${a//[[]}", "\n"},
	{"a=']'; echo ${a//[xy}", "]\n"},
	{"a='abc123'; echo ${a//[[:digit:]]}", "abc\n"},
	{"a='[[:wrong:]]'; echo ${a//[[:wrong:]]}", "[[:wrong:]]\n"},
	{"a='[[:wrong:]]'; echo ${a//[[:}", "[[:wrong:]]\n"},
	{"a='abcx1y'; echo ${a//x[[:digit:]]y}", "abc\n"},
	{`a=xyz; echo "${a/y/a  b}"`, "xa  bz\n"},
	{"a='foo/bar'; echo ${a//o*a/}", "fr\n"},
	{
		"echo ${a:-b}; echo $a; a=; echo ${a:-b}; a=c; echo ${a:-b}",
		"b\n\nb\nc\n",
	},
	{
		"echo ${#:-never} ${?:-never} ${LINENO:-never}",
		"0 0 1\n",
	},
	{
		"echo ${a-b}; echo $a; a=; echo ${a-b}; a=c; echo ${a-b}",
		"b\n\n\nc\n",
	},
	{
		"echo ${a:=b}; echo $a; a=; echo ${a:=b}; a=c; echo ${a:=b}",
		"b\nb\nb\nc\n",
	},
	{
		"echo ${a=b}; echo $a; a=; echo ${a=b}; a=c; echo ${a=b}",
		"b\nb\n\nc\n",
	},
	{
		"echo ${a:+b}; echo $a; a=; echo ${a:+b}; a=c; echo ${a:+b}",
		"\n\n\nb\n",
	},
	{
		"echo ${a+b}; echo $a; a=; echo ${a+b}; a=c; echo ${a+b}",
		"\n\nb\nb\n",
	},
	{
		"a=b; echo ${a:?err1}; a=; echo ${a:?err2}; unset a; echo ${a:?err3}",
		"b\nerr2\nexit status 1 #JUSTERR",
	},
	{
		"a=b; echo ${a?err1}; a=; echo ${a?err2}; unset a; echo ${a?err3}",
		"b\n\nerr3\nexit status 1 #JUSTERR",
	},
	{
		"echo ${a:?%s}",
		"%s\nexit status 1 #JUSTERR",
	},
	{
		"x=aaabccc; echo ${x#*a}; echo ${x##*a}",
		"aabccc\nbccc\n",
	},
	{
		"x=(__a _b c_); echo ${x[@]#_}",
		"_a b c_\n",
	},
	{
		"x=(a__ b_ _c); echo ${x[@]%%_}",
		"a_ b _c\n",
	},
	{
		"x=aaabccc; echo ${x%c*}; echo ${x%%c*}",
		"aaabcc\naaab\n",
	},
	{
		"x=aaabccc; echo ${x%%[bc}",
		"aaabccc\n",
	},
	{
		"a='àÉñ bAr'; echo ${a^}; echo ${a^^}",
		"ÀÉñ bAr\nÀÉÑ BAR\n",
	},
	{
		"a='àÉñ bAr'; echo ${a,}; echo ${a,,}",
		"àÉñ bAr\nàéñ bar\n",
	},
	{
		"a='àÉñ bAr'; echo ${a^?}; echo ${a^^[br]}",
		"ÀÉñ bAr\nàÉñ BAR\n",
	},
	{
		"a='àÉñ bAr'; echo ${a,?}; echo ${a,,[br]}",
		"àÉñ bAr\nàÉñ bAr\n",
	},
	{
		"a=(àÉñ bAr); echo ${a[@]^}; echo ${a[*],,}",
		"ÀÉñ BAr\nàéñ bar\n",
	},
	{
		"INTERP_X_1=a INTERP_X_2=b; echo ${!INTERP_X_*}",
		"INTERP_X_1 INTERP_X_2\n",
	},
	{
		"INTERP_X_2=b INTERP_X_1=a; echo ${!INTERP_*}",
		"INTERP_GLOBAL INTERP_X_1 INTERP_X_2\n",
	},
	{
		`INTERP_X_2=b INTERP_X_1=a; set -- ${!INTERP_*}; echo $#`,
		"3\n",
	},
	{
		`INTERP_X_2=b INTERP_X_1=a; set -- "${!INTERP_*}"; echo $#`,
		"1\n",
	},
	{
		`INTERP_X_2=b INTERP_X_1=a; set -- ${!INTERP_@}; echo $#`,
		"3\n",
	},
	{
		`INTERP_X_2=b INTERP_X_1=a; set -- "${!INTERP_@}"; echo $#`,
		"3\n",
	},
	{
		`a='b  c'; eval "echo -n ${a} ${a@Q}"`,
		`b c b  c`,
	},
	{
		`a='"\n'; printf "%s %s" "${a}" "${a@E}"`,
		"\"\\n \"\n",
	},

// if
	{
		"if true; then echo foo; fi",
		"foo\n",
	},
	{
		"if false; then echo foo; fi",
		"",
	},
	{
		"if false; then echo foo; fi",
		"",
	},
	{
		"if true; then echo foo; else echo bar; fi",
		"foo\n",
	},
	{
		"if false; then echo foo; else echo bar; fi",
		"bar\n",
	},
	{
		"if true; then false; fi",
		"exit status 1",
	},
	{
		"if false; then :; else false; fi",
		"exit status 1",
	},
	{
		"if false; then :; elif true; then echo foo; fi",
		"foo\n",
	},
	{
		"if false; then :; elif false; then :; elif true; then echo foo; fi",
		"foo\n",
	},
	{
		"if false; then :; elif false; then :; else echo foo; fi",
		"foo\n",
	},

// while
	{
		"while false; do echo foo; done",
		"",
	},
	{
		"while true; do exit 1; done",
		"exit status 1",
	},
	{
		"while true; do break; done",
		"",
	},
	{
		"while true; do while true; do break 2; done; done",
		"",
	},

// until
	{
		"until true; do echo foo; done",
		"",
	},
	{
		"until false; do exit 1; done",
		"exit status 1",
	},
	{
		"until false; do break; done",
		"",
	},

// for
	{
		"for i in 1 2 3; do echo $i; done",
		"1\n2\n3\n",
	},
	{
		"for i in 1 2 3; do echo $i; exit; done",
		"1\n",
	},
	{
		"for i in 1 2 3; do echo $i; false; done",
		"1\n2\n3\nexit status 1",
	},
	{
		"for i in 1 2 3; do echo $i; break; done",
		"1\n",
	},
	{
		"for i in 1 2 3; do echo $i; continue; echo foo; done",
		"1\n2\n3\n",
	},
	{
		"for i in 1 2; do for j in a b; do echo $i $j; continue 2; done; done",
		"1 a\n2 a\n",
	},
	{
		"for ((i=0; i<3; i++)); do echo $i; done",
		"0\n1\n2\n",
	},
	// for, with missing Init, Cond, Post
	{
		"i=0; for ((; i<3; i++)); do echo $i; done",
		"0\n1\n2\n",
	},
	{
		"for ((i=0;; i++)); do if [ $i -ge 3 ]; then break; fi; echo $i; done",
		"0\n1\n2\n",
	},
	{
		"for ((i=0; i<3;)); do echo $i; i=$((i+1)); done",
		"0\n1\n2\n",
	},
	{
		"i=0; for ((;;)); do if [ $i -ge 3 ]; then break; fi; echo $i; i=$((i+1)); done",
		"0\n1\n2\n",
	},
	// TODO: uncomment once expandEnv.Set starts returning errors
	// {
	// 	"readonly i; for ((i=0; i<3; i++)); do echo $i; done",
	// 	"0\n1\n2\n",
	// },
	{
		"for ((i=5; i>0; i--)); do echo $i; break; done",
		"5\n",
	},
	{
		"for i in 1 2; do for j in a b; do echo $i $j; done; break; done",
		"1 a\n1 b\n",
	},
	{
		"for i in 1 2 3; do :; done; echo $i",
		"3\n",
	},
	{
		"for ((i=0; i<3; i++)); do :; done; echo $i",
		"3\n",
	},
	{
		"set -- a 'b c'; for i in; do echo $i; done",
		"",
	},
	{
		"set -- a 'b c'; for i; do echo $i; done",
		"a\nb c\n",
	},

// block
	{
		"{ echo foo; }",
		"foo\n",
	},
	{
		"{ false; }",
		"exit status 1",
	},

// subshell
	{
		"(echo foo)",
		"foo\n",
	},
	{
		"(false)",
		"exit status 1",
	},
	{
		"(exit 1)",
		"exit status 1",
	},
	{
		"(foo=bar; echo $foo); echo $foo",
		"bar\n\n",
	},
	{
		"(echo() { printf 'bar\n'; }; echo); echo",
		"bar\n\n",
	},
	{
		"unset INTERP_GLOBAL & echo $INTERP_GLOBAL",
		"value\n",
	},
	{
		"(fn() { :; }) & pwd >/dev/null",
		"",
	},
	{
		"x[0]=x; (echo ${x[0]}; x[0]=y; echo ${x[0]}); echo ${x[0]}",
		"x\ny\nx\n",
	},
	{
		`x[3]=x; (x[3]=y); echo ${x[3]}`,
		"x\n",
	},
	{
		"shopt -s expand_aliases; alias f='echo x'\nf\n(f\nalias f='echo y'\neval f\n)\nf\n",
		"x\nx\ny\nx\n",
	},
	{
		"set -- a; echo $1; (echo $1; set -- b; echo $1); echo $1",
		"a\na\nb\na\n",
	},
	{"false; ( echo $? )", "1\n"},

// cd/pwd
	{"[[ fo~ == 'fo~' ]]", ""},
	{`[[ 'ab\c' == *\\* ]]`, ""},
	{`[[ foo/bar == foo* ]]`, ""},
	{"[[ a == [ab ]]", "exit status 1"},
	{`HOME='/*'; echo ~; echo "$HOME"`, "/*\n/*\n"},
	{`test -d ~`, ""},
	{`foo=~; test -d $foo`, ""},
	{`foo=~; test -d "$foo"`, ""},
	{`foo='~'; test -d $foo`, "exit status 1"},
	{`foo='~'; [ $foo == '~' ]`, ""},
	{
		`[[ ~ == "$HOME" ]] && [[ ~/foo == "$HOME/foo" ]]`,
		"",
	},
	{
		`HOME=$PWD/home; mkdir home; touch home/f; [[ -e ~/f ]]`,
		"",
	},
	{
		`HOME=$PWD/home; mkdir home; touch home/f; [[ ~/f -ef $HOME/f ]]`,
		"",
	},
	{
		"[[ ~noexist == '~noexist' ]]",
		"",
	},
	{
		`w="$HOME"; cd; [[ $PWD == "$w" ]]`,
		"",
	},
	{
		`HOME=/foo; echo $HOME`,
		"/foo\n",
	},
	{
		"cd noexist",
		"exit status 1 #JUSTERR",
	},
	{
		"mkdir -p a/b && cd a && cd b && cd ../..",
		"",
	},
	{
		">a && cd a",
		"exit status 1 #JUSTERR",
	},
	{
		`[[ $PWD == "$(pwd)" ]]`,
		"",
	},
	{
		"PWD=changed; [[ $PWD == changed ]]",
		"",
	},
	{
		"PWD=changed; mkdir a; cd a; [[ $PWD == changed ]]",
		"exit status 1",
	},
	{
		`mkdir %s; old="$PWD"; cd %s; [[ $old == "$PWD" ]]`,
		"exit status 1",
	},
	{
		`old="$PWD"; mkdir a; cd a; cd ..; [[ $old == "$PWD" ]]`,
		"",
	},
	{
		`[[ $PWD == "$OLDPWD" ]]`,
		"exit status 1",
	},
	{
		`old="$PWD"; mkdir a; cd a; [[ $old == "$OLDPWD" ]]`,
		"",
	},
	{
		`mkdir a; ln -s a b; [[ $(cd a && pwd) == "$(cd b && pwd)" ]]; echo $?`,
		"1\n",
	},

// dirs/pushd/popd
	{"set -- $(dirs); echo $# ${#DIRSTACK[@]}", "1 1\n"},
	{"pushd", "pushd: no other directory\nexit status 1 #JUSTERR"},
	{"pushd -n", ""},
	{"pushd foo bar", "pushd: too many arguments\nexit status 2 #JUSTERR"},
	{"pushd does-not-exist; set -- $(dirs); echo $#", "1\n #IGNORE"},
	{"mkdir a; pushd a >/dev/null; set -- $(dirs); echo $#", "2\n"},
	{"mkdir a; set -- $(pushd a); echo $#", "2\n"},
	{
		`mkdir a; pushd a >/dev/null; set -- $(dirs); [[ $1 == "$HOME" ]]`,
		"exit status 1",
	},
	{
		`mkdir a; pushd a >/dev/null; [[ ${DIRSTACK[0]} == "$HOME" ]]`,
		"exit status 1",
	},
	{
		`old=$(dirs); mkdir a; pushd a >/dev/null; pushd >/dev/null; set -- $(dirs); [[ $1 == "$old" ]]`,
		"",
	},
	{
		`old=$(dirs); mkdir a; pushd a >/dev/null; pushd -n >/dev/null; set -- $(dirs); [[ $1 == "$old" ]]`,
		"exit status 1",
	},
	{
		"mkdir a; pushd a >/dev/null; pushd >/dev/null; rm -r a; pushd",
		"exit status 1 #JUSTERR",
	},
	{
		`old=$(dirs); mkdir a; pushd -n a >/dev/null; set -- $(dirs); [[ $1 == "$old" ]]`,
		"",
	},
	{
		`old=$(dirs); mkdir a; pushd -n a >/dev/null; pushd >/dev/null; set -- $(dirs); [[ $1 == "$old" ]]`,
		"exit status 1",
	},
	{"popd", "popd: directory stack empty\nexit status 1 #JUSTERR"},
	{"popd -n", "popd: directory stack empty\nexit status 1 #JUSTERR"},
	{"popd foo", "popd: invalid argument\nexit status 2 #JUSTERR"},
	{"old=$(dirs); mkdir a; pushd a >/dev/null; set -- $(popd); echo $#", "1\n"},
	{
		`old=$(dirs); mkdir a; pushd a >/dev/null; popd >/dev/null; [[ $(dirs) == "$old" ]]`,
		"",
	},
	{"old=$(dirs); mkdir a; pushd a >/dev/null; set -- $(popd -n); echo $#", "1\n"},
	{
		`old=$(dirs); mkdir a; pushd a >/dev/null; popd -n >/dev/null; [[ $(dirs) == "$old" ]]`,
		"exit status 1",
	},
	{
		"mkdir a; pushd a >/dev/null; pushd >/dev/null; rm -r a; popd",
		"exit status 1 #JUSTERR",
	},

// binary cmd
	{
		"true && echo foo || echo bar",
		"foo\n",
	},
	{
		"false && echo foo || echo bar",
		"bar\n",
	},

// func
	{
		"foo() { echo bar; }; foo",
		"bar\n",
	},
	{
		"foo() { echo $1; }; foo",
		"\n",
	},
	{
		"foo() { echo $1; }; foo a b",
		"a\n",
	},
	{
		"foo() { echo $1; bar c d; echo $2; }; bar() { echo $2; }; foo a b",
		"a\nd\nb\n",
	},
	{
		`foo() { echo $#; }; foo; foo 1 2 3; foo "a b"; echo $#`,
		"0\n3\n1\n0\n",
	},
	{
		`foo() { for a in $*; do echo "$a"; done }; foo 'a  1' 'b  2'`,
		"a\n1\nb\n2\n",
	},
	{
		`foo() { for a in "$*"; do echo "$a"; done }; foo 'a  1' 'b  2'`,
		"a  1 b  2\n",
	},
	{
		`foo() { for a in "foo$*"; do echo "$a"; done }; foo 'a  1' 'b  2'`,
		"fooa  1 b  2\n",
	},
	{
		`foo() { for a in $@; do echo "$a"; done }; foo 'a  1' 'b  2'`,
		"a\n1\nb\n2\n",
	},
	{
		`foo() { for a in "$@"; do echo "$a"; done }; foo 'a  1' 'b  2'`,
		"a  1\nb  2\n",
	},

// alias (note the input newlines)
	{
		"alias foo; alias foo=echo; alias foo; alias foo=; alias foo",
		"alias: \"foo\" not found\nalias foo='echo'\nalias foo=''\n #IGNORE",
	},
	{
		"shopt -s expand_aliases; alias foo=echo\nfoo foo; foo bar",
		"foo\nbar\n",
	},
	{
		"shopt -s expand_aliases; alias true=echo\ntrue foo; unalias true\ntrue bar",
		"foo\n",
	},
	{
		"shopt -s expand_aliases; alias echo='echo a'\necho b c",
		"a b c\n",
	},
	{
		"shopt -s expand_aliases; alias foo='echo '\nfoo foo; foo bar",
		"echo\nbar\n",
	},

// case
	{
		"case b in x) echo foo ;; a|b) echo bar ;; esac",
		"bar\n",
	},
	{
		"case b in x) echo foo ;; y|z) echo bar ;; esac",
		"",
	},
	{
		"case foo in bar) echo foo ;; *) echo bar ;; esac",
		"bar\n",
	},
	{
		"case foo in *o*) echo bar ;; esac",
		"bar\n",
	},
	{
		"case foo in '*') echo x ;; f*) echo y ;; esac",
		"y\n",
	},

// exec
	{
		"$GOSH_PROG 'echo foo'",
		"foo\n",
	},
	{
		"$GOSH_PROG 'echo foo >&2' >/dev/null",
		"foo\n",
	},
	{
		"echo foo | $GOSH_PROG 'cat >&2' >/dev/null",
		"foo\n",
	},
	{
		"$GOSH_PROG 'exit 1'",
		"exit status 1",
	},
	{
		"exec >/dev/null; echo foo",
		"",
	},

// return
	{"return", "return: can only be done from a func or sourced script\nexit status 1 #JUSTERR"},
	{"f() { return; }; f", ""},
	{"f() { return 2; }; f", "exit status 2"},
	{"f() { echo foo; return; echo bar; }; f", "foo\n"},
	{"f1() { :; }; f2() { f1; return; }; f2", ""},
	{"echo 'return' >a; source a", ""},
	{"echo 'return' >a; source a; return", "return: can only be done from a func or sourced script\nexit status 1 #JUSTERR"},
	{"echo 'return 2' >a; source a", "exit status 2"},
	{"echo 'echo foo; return; echo bar' >a; source a", "foo\n"},

// command
	{"command", ""},
	{"command -o echo", "command: invalid option -o\nexit status 2 #JUSTERR"},
	{"echo() { :; }; echo foo", ""},
	{"echo() { :; }; command echo foo", "foo\n"},
	{"command -v does-not-exist", "exit status 1"},
	{"foo() { :; }; command -v foo", "foo\n"},
	{"foo() { :; }; command -v does-not-exist foo", "foo\n"},
	{"command -v echo", "echo\n"},
	{"[[ $(command -v $PATH_PROG) == $PATH_PROG ]]", "exit status 1"},

// cmd substitution
	{
		"echo foo $(printf bar)",
		"foo bar\n",
	},
	{
		"echo foo $(echo bar)",
		"foo bar\n",
	},
	{
		"$(echo echo foo bar)",
		"foo bar\n",
	},
	{
		"for i in 1 $(echo 2 3) 4; do echo $i; done",
		"1\n2\n3\n4\n",
	},
	{
		"echo 1$(echo 2 3)4",
		"12 34\n",
	},
	{
		`mkdir d; [[ $(cd d && pwd) == "$(pwd)" ]]`,
		"exit status 1",
	},
	{
		"a=sub true & { a=main $ENV_PROG | grep '^a='; }",
		"a=main\n",
	},
	{
		"echo foo >f; echo $(cat f); echo $(<f)",
		"foo\nfoo\n",
	},
	{
		"echo foo >f; echo $(<f; echo bar)",
		"bar\n",
	},

// pipes
	{
		"echo foo | sed 's/o/a/g'",
		"faa\n",
	},
	{
		"echo foo | false | true",
		"",
	},
	{
		"true $(true) | true", // used to panic
		"",
	},
	{
		// The first command in the block used to consume stdin, even
		// though it shouldn't be. We just want to run any arbitrary
		// non-builtin program that doesn't consume stdin.
		"echo foo | { $ENV_PROG >/dev/null; cat; }",
		"foo\n",
	},

// redirects
	{
		"echo foo >&1 | sed 's/o/a/g'",
		"faa\n",
	},
	{
		"echo foo >&2 | sed 's/o/a/g'",
		"foo\n",
	},
	{
		// TODO: why does bash need a block here?
		"{ echo foo >&2; } |& sed 's/o/a/g'",
		"faa\n",
	},
	{
		"echo foo >/dev/null; echo bar",
		"bar\n",
	},
	{
		">a; echo foo >>b; wc -c <a >>b; cat b",
		"foo\n0\n",
	},
	{
		"echo foo >a; <a",
		"",
	},
	{
		"echo foo >a; wc -c <a",
		"4\n",
	},
	{
		"echo foo >>a; echo bar &>>a; wc -c <a",
		"8\n",
	},
	{
		"{ echo a; echo b >&2; } &>/dev/null",
		"",
	},
	{
		"sed 's/o/a/g' <<EOF\nfoo$foo\nEOF",
		"faa\n",
	},
	{
		"sed 's/o/a/g' <<'EOF'\nfoo$foo\nEOF",
		"faa$faa\n",
	},
	{
		"sed 's/o/a/g' <<EOF\n\tfoo\nEOF",
		"\tfaa\n",
	},
	{
		"sed 's/o/a/g' <<EOF\nfoo\nEOF",
		"faa\n",
	},
	{
		"cat <<EOF\n~/foo\nEOF",
		"~/foo\n",
	},
	{
		"sed 's/o/a/g' <<<foo$foo",
		"faa\n",
	},
	{
		"cat <<-EOF\n\tfoo\nEOF",
		"foo\n",
	},
	{
		"cat <<-EOF\n\tfoo\n\nEOF",
		"foo\n\n",
	},
	{
		"cat <<EOF\nfoo\\\nbar\nEOF",
		"foobar\n",
	},
	{
		"cat <<'EOF'\nfoo\\\nbar\nEOF",
		"foo\\\nbar\n",
	},
	{
		"mkdir a; echo foo >a |& grep -q 'is a directory'",
		" #IGNORE",
	},
	{
		"echo foo 1>&1 | sed 's/o/a/g'",
		"faa\n",
	},
	{
		"echo foo 2>&2 |& sed 's/o/a/g'",
		"faa\n",
	},
	{
		"printf 2>&1 | sed 's/.*usage.*/foo/'",
		"foo\n",
	},
	{
		"mkdir a && cd a && echo foo >b && cd .. && cat a/b",
		"foo\n",
	},

// background/wait
	{"wait", ""},
	{"{ true; } & wait", ""},
	{"{ exit 1; } & wait", ""},
	{
		"{ echo foo; } & wait; echo bar",
		"foo\nbar\n",
	},
	{
		"{ echo foo & wait; } & wait; echo bar",
		"foo\nbar\n",
	},
	{`mkdir d; old=$PWD; cd d & wait; [[ $old == "$PWD" ]]`, ""},
	{
		"f() { echo 1; }; { sleep 0.01s; f; } & f() { echo 2; }; wait",
		"1\n",
	},

// bash test
	{
		"[[ a ]]",
		"",
	},
	{
		"[[ '' ]]",
		"exit status 1",
	},
	{
		"[[ '' ]]; [[ a ]]",
		"",
	},
	{
		"[[ ! (a == b) ]]",
		"",
	},
	{
		"[[ a != b ]]",
		"",
	},
	{
		"[[ a && '' ]]",
		"exit status 1",
	},
	{
		"[[ a || '' ]]",
		"",
	},
	{
		"[[ a > 3 ]]",
		"",
	},
	{
		"[[ a < 3 ]]",
		"exit status 1",
	},
	{
		"[[ 3 == 03 ]]",
		"exit status 1",
	},
	{
		"[[ a -eq b ]]",
		"",
	},
	{
		"[[ 3 -eq 03 ]]",
		"",
	},
	{
		"[[ 3 -ne 4 ]]",
		"",
	},
	{
		"[[ 3 -le 4 ]]",
		"",
	},
	{
		"[[ 3 -ge 4 ]]",
		"exit status 1",
	},
	{
		"[[ 3 -ge 3 ]]",
		"",
	},
	{
		"[[ 3 -lt 4 ]]",
		"",
	},
	{
		"[[ 3 -gt 4 ]]",
		"exit status 1",
	},
	{
		"[[ 3 -gt 3 ]]",
		"exit status 1",
	},
	{
		"[[ a -nt a || a -ot a ]]",
		"exit status 1",
	},
	{
		"touch -d @1 a b; [[ a -nt b || a -ot b ]]",
		"exit status 1",
	},
	{
		"touch -d @1 a; touch -d @2 b; [[ a -nt b ]]",
		"exit status 1",
	},
	{
		"touch -d @1 a; touch -d @2 b; [[ a -ot b ]]",
		"",
	},
	{
		"[[ a -ef b ]]",
		"exit status 1",
	},
	{
		">a >b; [[ a -ef b ]]",
		"exit status 1",
	},
	{
		">a; [[ a -ef a ]]",
		"",
	},
	{
		">a; ln a b; [[ a -ef b ]]",
		"",
	},
	{
		">a; ln -s a b; [[ a -ef b ]]",
		"",
	},
	{
		"[[ -z 'foo' || -n '' ]]",
		"exit status 1",
	},
	{
		"[[ -z '' && -n 'foo' ]]",
		"",
	},
	{
		"a=x b=''; [[ -v a && -v b && ! -v c ]]",
		"",
	},
	{
		"[[ abc == *b* ]]",
		"",
	},
	{
		"[[ abc != *b* ]]",
		"exit status 1",
	},
	{
		"[[ *b = '*b' ]]",
		"",
	},
	{
		"[[ ab == a. ]]",
		"exit status 1",
	},
	{
		`x='*b*'; [[ abc == $x ]]`,
		"",
	},
	{
		`x='*b*'; [[ abc == "$x" ]]`,
		"exit status 1",
	},
	{
		`[[ abc == \a\bc ]]`,
		"",
	},
	{
		"[[ abc != *b'*' ]]",
		"",
	},
	{
		"[[ a =~ b ]]",
		"exit status 1",
	},
	{
		"[[ foo =~ foo && foo =~ .* && foo =~ f.o ]]",
		"",
	},
	{
		"[[ foo =~ oo ]] && echo foo; [[ foo =~ ^oo$ ]] && echo bar || true",
		"foo\n",
	},
	{
		"[[ a =~ [ ]]",
		"exit status 2",
	},
	{
		"[[ -e a ]] && echo x; >a; [[ -e a ]] && echo y",
		"y\n",
	},
	{
		"ln -s b a; [[ -e a ]] && echo x; >b; [[ -e a ]] && echo y",
		"y\n",
	},
	{
		"[[ -f a ]] && echo x; >a; [[ -f a ]] && echo y",
		"y\n",
	},
	{
		"[[ -e a ]] && echo x; mkdir a; [[ -e a ]] && echo y",
		"y\n",
	},
	{
		"[[ -d a ]] && echo x; mkdir a; [[ -d a ]] && echo y",
		"y\n",
	},
	{
		"[[ -r a ]] && echo x; >a; [[ -r a ]] && echo y",
		"y\n",
	},
	{
		"[[ -w a ]] && echo x; >a; [[ -w a ]] && echo y",
		"y\n",
	},
	{
		"[[ -s a ]] && echo x; echo body >a; [[ -s a ]] && echo y",
		"y\n",
	},
	{
		"[[ -L a ]] && echo x; ln -s b a; [[ -L a ]] && echo y;",
		"y\n",
	},
	{
		"mkdir a; cd a; test -f b && echo x; >b; test -f b && echo y",
		"y\n",
	},
	{
		">a; [[ -b a ]] && echo block; [[ -c a ]] && echo char; true",
		"",
	},
	{
		"[[ -e /dev/sda ]] || { echo block; exit; }; [[ -b /dev/sda ]] && echo block; [[ -c /dev/sda ]] && echo char; true",
		"block\n",
	},
	{
		"[[ -e /dev/tty ]] || { echo char; exit; }; [[ -b /dev/tty ]] && echo block; [[ -c /dev/tty ]] && echo char; true",
		"char\n",
	},
	{"[[ -t 1 ]]", "exit status 1"},
	{"[[ -t 1234 ]]", "exit status 1"},
	{"[[ -o wrong ]]", "exit status 1"},
	{"[[ -o errexit ]]", "exit status 1"},
	{"set -e; [[ -o errexit ]]", ""},
	{"[[ -o noglob ]]", "exit status 1"},
	{"set -f; [[ -o noglob ]]", ""},
	{"[[ -o allexport ]]", "exit status 1"},
	{"set -a; [[ -o allexport ]]", ""},
	{"[[ -o nounset ]]", "exit status 1"},
	{"set -u; [[ -o nounset ]]", ""},
	{"[[ -o noexec ]]", "exit status 1"},
	{"set -n; [[ -o noexec ]]", ""}, // actually does nothing, but oh well
	{"[[ -o pipefail ]]", "exit status 1"},
	{"set -o pipefail; [[ -o pipefail ]]", ""},

// classic test
	{
		"[",
		"1:1: [: missing matching ]\nexit status 2 #JUSTERR",
	},
	{
		"[ a",
		"1:1: [: missing matching ]\nexit status 2 #JUSTERR",
	},
	{
		"[ a b c ]",
		"1:1: not a valid test operator: b\nexit status 2 #JUSTERR",
	},
	{
		"[ a -a ]",
		"1:1: -a must be followed by an expression\nexit status 2 #JUSTERR",
	},
	{"[ a ]", ""},
	{"[ -n ]", ""},
	{"[ '-n' ]", ""},
	{"[ -z ]", ""},
	{"[ ! ]", ""},
	{"[ a != b ]", ""},
	{"[ ! a '==' a ]", "exit status 1"},
	{"[ a -a 0 -gt 1 ]", "exit status 1"},
	{"[ 0 -gt 1 -o 1 -gt 0 ]", ""},
	{"[ 3 -gt 4 ]", "exit status 1"},
	{"[ 3 -lt 4 ]", ""},
	{
		"[ -e a ] && echo x; >a; [ -e a ] && echo y",
		"y\n",
	},
	{
		"test 3 -gt 4",
		"exit status 1",
	},
	{
		"test 3 -lt 4",
		"",
	},
	{
		"test 3 -lt",
		"1:1: -lt must be followed by a word\nexit status 2 #JUSTERR",
	},
	{
		"touch -d @1 a; touch -d @2 b; [ a -nt b ]",
		"exit status 1",
	},
	{
		"touch -d @1 a; touch -d @2 b; [ a -ot b ]",
		"",
	},
	{
		">a; [ a -ef a ]",
		"",
	},
	{"[ 3 -eq 04 ]", "exit status 1"},
	{"[ 3 -eq 03 ]", ""},
	{"[ 3 -ne 03 ]", "exit status 1"},
	{"[ 3 -le 4 ]", ""},
	{"[ 3 -ge 4 ]", "exit status 1"},
	{
		"[ -d a ] && echo x; mkdir a; [ -d a ] && echo y",
		"y\n",
	},
	{
		"[ -r a ] && echo x; >a; [ -r a ] && echo y",
		"y\n",
	},
	{
		"[ -w a ] && echo x; >a; [ -w a ] && echo y",
		"y\n",
	},
	{
		"[ -s a ] && echo x; echo body >a; [ -s a ] && echo y",
		"y\n",
	},
	{
		"[ -L a ] && echo x; ln -s b a; [ -L a ] && echo y;",
		"y\n",
	},
	{
		">a; [ -b a ] && echo block; [ -c a ] && echo char; true",
		"",
	},
	{"[ -t 1 ]", "exit status 1"},
	{"[ -t 1234 ]", "exit status 1"},
	{"[ -o wrong ]", "exit status 1"},
	{"[ -o errexit ]", "exit status 1"},
	{"set -e; [ -o errexit ]", ""},
	{"a=x b=''; [ -v a -a -v b -a ! -v c ]", ""},
	{"[ a = a ]", ""},
	{"[ a != a ]", "exit status 1"},
	{"[ abc = ab* ]", "exit status 1"},
	{"[ abc != ab* ]", ""},

// arithm
	{
		"echo $((1 == +1))",
		"1\n",
	},
	{
		"echo $((!0))",
		"1\n",
	},
	{
		"echo $((!3))",
		"0\n",
	},
	{
		"echo $((~0))",
		"-1\n",
	},
	{
		"echo $((~3))",
		"-4\n",
	},
	{
		"echo $((1 + 2 - 3))",
		"0\n",
	},
	{
		"echo $((-1 * 6 / 2))",
		"-3\n",
	},
	{
		"a=2; echo $(( a + $a + c ))",
		"4\n",
	},
	{
		"a=b; b=c; c=5; echo $((a % 3))",
		"2\n",
	},
	{
		"echo $((2 > 2 || 2 < 2))",
		"0\n",
	},
	{
		"echo $((2 >= 2 && 2 <= 2))",
		"1\n",
	},
	{
		"echo $(((1 & 2) != (1 | 2)))",
		"1\n",
	},
	{
		"echo $a; echo $((a = 3 ^ 2)); echo $a",
		"\n1\n1\n",
	},
	{
		"echo $((a += 1, a *= 2, a <<= 2, a >> 1))",
		"4\n",
	},
	{
		"echo $((a -= 10, a /= 2, a >>= 1, a << 1))",
		"-6\n",
	},
	{
		"echo $((a |= 3, a &= 1, a ^= 8, a %= 5, a))",
		"4\n",
	},
	{
		"echo $((a = 3, ++a, a--))",
		"4\n",
	},
	{
		"echo $((2 ** 3)) $((1234 ** 4567))",
		"8 0\n",
	},
	{
		"echo $((1 ? 2 : 3)) $((0 ? 2 : 3))",
		"2 3\n",
	},
	{
		"((1))",
		"",
	},
	{
		"((3 == 4))",
		"exit status 1",
	},
	{
		"let i=(3+4); let i++; echo $i; let i--; echo $i",
		"8\n7\n",
	},
	{
		"let 3==4",
		"exit status 1",
	},
	{
		"a=1; let a++; echo $a",
		"2\n",
	},
	{
		"a=$((1 + 2)); echo $a",
		"3\n",
	},
	{
		"x=3; echo $(($x)) $((x))",
		"3 3\n",
	},
	{
		"set -- 1; echo $(($@))",
		"1\n",
	},
	{
		"a=b b=a; echo $(($a))",
		"0\n #IGNORE",
	},

// set/shift
	{
		"echo $#; set foo bar; echo $#",
		"0\n2\n",
	},
	{
		"shift; set a b c; shift; echo $@",
		"b c\n",
	},
	{
		"shift 2; set a b c; shift 2; echo $@",
		"c\n",
	},
	{
		`echo $#; set '' ""; echo $#`,
		"0\n2\n",
	},
	{
		"set -- a b; echo $#",
		"2\n",
	},
	{
		"set -U",
		"set: invalid option: \"-U\"\nexit status 2 #JUSTERR",
	},
	{
		"set -e; false; echo foo",
		"exit status 1",
	},
	{
		"set -e; set +e; false; echo foo",
		"foo\n",
	},
	{
		"set -e; ! false; echo foo",
		"foo\n",
	},
	{
		"set -e; ! true; echo foo",
		"foo\n",
	},
	{
		"set -e; if false; then echo foo; fi",
		"",
	},
	{
		"set -e; while false; do echo foo; done",
		"",
	},
	{
		"set -e; false || true",
		"",
	},
	{
		"set -e; false && true; true",
		"",
	},
	{
		"false | :",
		"",
	},
	{
		"set -o pipefail; false | :",
		"exit status 1",
	},
	{
		"set -o pipefail; true | false | true | :",
		"exit status 1",
	},
	{
		"set -o pipefail; set -M 2>/dev/null | false",
		"exit status 1",
	},
	{
		"set -f; >a.x; echo *.x;",
		"*.x\n",
	},
	{
		"set -f; set +f; >a.x; echo *.x;",
		"a.x\n",
	},
	{
		"set -a; foo=bar; $ENV_PROG | grep ^foo=",
		"foo=bar\n",
	},
	{
		"set -a; foo=(b a r); $ENV_PROG | grep ^foo=",
		"exit status 1",
	},
	{
		"foo=bar; set -a; $ENV_PROG | grep ^foo=",
		"exit status 1",
	},
	{
		"a=b; echo $a; set -u; echo $a",
		"b\nb\n",
	},
	{
		"echo $a; set -u; echo $a; echo extra",
		"\na: unbound variable\nexit status 1 #JUSTERR",
	},
	{"set -n; echo foo", ""},
	{"set -n; [ wrong", ""},
	{"set -n; set +n; echo foo", ""},
	{
		"set -o foobar",
		"set: invalid option: \"-o\"\nexit status 2 #JUSTERR",
	},
	{"set -o noexec; echo foo", ""},
	{"set +o noexec; echo foo", "foo\n"},
	{"set -e; set -o | grep -E 'errexit|noexec' | wc -l", "2\n"},
	{"set -e; set -o | grep -E 'errexit|noexec' | grep 'on$' | wc -l", "1\n"},
	{
		"set -a; set +o",
		`set -o allexport
set +o errexit
set +o noexec
set +o noglob
set +o nounset
set +o pipefail
 #IGNORE`,
	},

// unset
	{
		"a=1; echo $a; unset a; echo $a",
		"1\n\n",
	},
	{
		"notinpath() { echo func; }; notinpath; unset -f notinpath; notinpath",
		"func\n\"notinpath\": executable file not found in $PATH\nexit status 127 #JUSTERR",
	},
	{
		"a=1; a() { echo func; }; unset -f a; echo $a",
		"1\n",
	},
	{
		"a=1; a() { echo func; }; unset -v a; a; echo $a",
		"func\n\n",
	},
	{
		"notinpath=1; notinpath() { echo func; }; notinpath; echo $notinpath; unset notinpath; notinpath; echo $notinpath; unset notinpath; notinpath",
		"func\n1\nfunc\n\n\"notinpath\": executable file not found in $PATH\nexit status 127 #JUSTERR",
	},
	{
		"unset PATH; [[ $PATH == '' ]]",
		"",
	},
	{
		"readonly a=1; echo $a; unset a; echo $a",
		"1\na: readonly variable\n1\n #IGNORE",
	},
	{
		"f() { local a=1; echo $a; unset a; echo $a; }; f",
		"1\n\n",
	},
	{
		`a=b eval 'echo $a; unset a; echo $a'`,
		"b\n\n",
	},
	{
		`$(unset INTERP_GLOBAL); echo $INTERP_GLOBAL; unset INTERP_GLOBAL; echo $INTERP_GLOBAL`,
		"value\n\n",
	},
	{
		`x=orig; f() { local x=local; unset x; x=still_local; }; f; echo $x`,
		"orig\n",
	},
	{
		`x=orig; f() { local x=local; unset x; [[ -v x ]] && echo set || echo unset; }; f`,
		"unset\n",
	},

// shopt
	{"set -e; shopt -o | grep -E 'errexit|noexec' | wc -l", "2\n"},
	{"set -e; shopt -o | grep -E 'errexit|noexec' | grep 'on$' | wc -l", "1\n"},
	{"shopt -s -o noexec; echo foo", ""},
	{"shopt -u -o noexec; echo foo", "foo\n"},
	{"shopt -u globstar; shopt globstar | grep 'off$' | wc -l", "1\n"},
	{"shopt -s globstar; shopt globstar | grep 'off$' | wc -l", "0\n"},

// IFS
	{`echo -n "$IFS"`, " \t\n"},
	{`a="x:y:z"; IFS=:; echo $a`, "x y z\n"},
	{`a=(x y z); IFS=-; echo ${a[*]}`, "x y z\n"},
	{`a=(x y z); IFS=-; echo ${a[@]}`, "x y z\n"},
	{`a=(x y z); IFS=-; echo "${a[*]}"`, "x-y-z\n"},
	{`a=(x y z); IFS=-; echo "${a[@]}"`, "x y z\n"},
	{`a="  x y z"; IFS=; echo $a`, "  x y z\n"},
	{`a=(x y z); IFS=; echo "${a[*]}"`, "xyz\n"},
	{`a=(x y z); IFS=-; echo "${!a[@]}"`, "0 1 2\n"},
	{`set -- x y z; IFS=-; echo $*`, "x y z\n"},
	{`set -- x y z; IFS=-; echo "$*"`, "x-y-z\n"},
	{`set -- x y z; IFS=; echo $*`, "x y z\n"},
	{`set -- x y z; IFS=; echo "$*"`, "xyz\n"},

// builtin
	{"builtin", ""},
	{"builtin noexist", "exit status 1 #JUSTERR"},
	{"builtin echo foo", "foo\n"},
	{
		"echo() { printf 'bar\n'; }; echo foo; builtin echo foo",
		"bar\nfoo\n",
	},

// type
	{"type", ""},
	{"type echo", "echo is a shell builtin\n"},
	{"echo() { :; }; type echo | grep 'is a function'", "echo is a function\n"},
	{"type $PATH_PROG | grep -q -E ' is (/|[A-Z]:).*'", ""},
	{"type noexist", "type: noexist: not found\nexit status 1 #JUSTERR"},
	{"PATH=/ ; type $PATH_PROG", "type: " + pathProg + ": not found\nexit status 1 #JUSTERR"},
	{"shopt -s expand_aliases; alias foo='bar baz'\ntype foo", "foo is aliased to `bar baz'\n"},
	{"alias foo='bar baz'\ntype foo", "type: foo: not found\nexit status 1 #JUSTERR"},

// eval
	{"eval", ""},
	{"eval ''", ""},
	{"eval echo foo", "foo\n"},
	{"eval 'echo foo'", "foo\n"},
	{"eval 'exit 1'", "exit status 1"},
	{"eval '('", "eval: 1:1: reached EOF without matching ( with )\nexit status 1 #JUSTERR"},
	{"set a b; eval 'echo $@'", "a b\n"},
	{"eval 'a=foo'; echo $a", "foo\n"},
	{`a=b eval "echo $a"`, "\n"},
	{`a=b eval 'echo $a'`, "b\n"},
	{`eval 'echo "\$a"'`, "$a\n"},
	{`a=b eval 'x=y eval "echo \$a \$x"'`, "b y\n"},
	{`a=b eval 'a=y eval "echo $a \$a"'`, "b y\n"},
	{"a=b eval '(echo $a)'", "b\n"},

// source
	{
		"source",
		"1:1: source: need filename\nexit status 2 #JUSTERR",
	},
	{
		"echo 'echo foo' >a; source a; . a",
		"foo\nfoo\n",
	},
	{
		"echo 'echo $@' >a; source a; source a b c; echo $@",
		"\nb c\n\n",
	},
	{
		"echo 'foo=bar' >a; source a; echo $foo",
		"bar\n",
	},

// source with set and shift
	{
		"echo 'set -- d e f' >a; source a; echo $@",
		"d e f\n",
	},
	{
		"echo 'echo $@' >a; set -- b c; source a; echo $@",
		"b c\nb c\n",
	},
	{
		"echo 'echo $@' >a; set -- b c; source a d e; echo $@",
		"d e\nb c\n",
	},
	{
		"echo 'shift; echo $@' >a; set -- b c; source a d e; echo $@",
		"e\nb c\n",
	},
	{
		"echo 'shift' >a; set -- b c; source a; echo $@",
		"c\n",
	},
	{
		"echo 'shift; set -- $@' >a; set -- b c; source a d e; echo $@",
		"e\n",
	},
	{
		"echo 'set -- g f'>b; echo 'set -- d e f; echo $@; source b;' >a; source a; echo $@",
		"d e f\ng f\n",
	},
	{
		"echo 'set -- g f'>b; echo 'echo $@; set -- d e f; source b;' >a; source a b c; echo $@",
		"b c\ng f\n",
	},
	{
		"echo 'shift; echo $@' >b; echo 'shift; echo $@; source b' >a; source a b c d; echo $@",
		"c d\nd\n\n",
	},
	{
		"echo 'set -- b c d' >b; echo 'source b' >a; set -- a; source a; echo $@",
		"b c d\n",
	},
	{
		"echo 'echo $@' >b; echo 'set -- b c d; source b' >a; set -- a; source a; echo $@",
		"b c d\nb c d\n",
	},
	{
		"echo 'shift; echo $@' >b; echo 'shift; echo $@; source b c d' >a; set -- a b; source a; echo $@",
		"b\nd\nb\n",
	},
	{
		"echo 'set -- a b c' >b; echo 'echo $@; source b; echo $@' >a; source a; echo $@",
		"\na b c\na b c\n",
	},

// indexed arrays
	{
		"a=foo; echo ${a[0]} ${a[@]} ${a[x]}; echo ${a[1]}",
		"foo foo foo\n\n",
	},
	{
		"a=(); echo ${a[0]} ${a[@]} ${a[x]} ${a[1]}",
		"\n",
	},
	{
		"a=(b c); echo $a; echo ${a[0]}; echo ${a[1]}; echo ${a[x]}",
		"b\nb\nc\nb\n",
	},
	{
		"a=(b c); echo ${a[@]}; echo ${a[*]}",
		"b c\nb c\n",
	},
	{
		"a=(1 2 3); echo ${a[2-1]}; echo $((a[1+1]))",
		"2\n3\n",
	},
	{
		"a=(1 2) x=(); a+=b x+=c; echo ${a[@]}; echo ${x[@]}",
		"1b 2\nc\n",
	},
	{
		"a=(1 2) x=(); a+=(b c) x+=(d e); echo ${a[@]}; echo ${x[@]}",
		"1 2 b c\nd e\n",
	},
	{
		"a=bbb; a+=(c d); echo ${a[@]}",
		"bbb c d\n",
	},
	{
		`a=('a  1' 'b  2'); for e in ${a[@]}; do echo "$e"; done`,
		"a\n1\nb\n2\n",
	},
	{
		`a=('a  1' 'b  2'); for e in "${a[*]}"; do echo "$e"; done`,
		"a  1 b  2\n",
	},
	{
		`a=('a  1' 'b  2'); for e in "${a[@]}"; do echo "$e"; done`,
		"a  1\nb  2\n",
	},
	{
		`a=([1]=y [0]=x); echo ${a[0]}`,
		"x\n",
	},
	{
		`a=(y); a[2]=x; echo ${a[2]}`,
		"x\n",
	},
	{
		`a="y"; a[2]=x; echo ${a[2]}`,
		"x\n",
	},
	{
		`declare -a a=(x y); echo ${a[1]}`,
		"y\n",
	},
	{
		`a=b; echo "${a[@]}"`,
		"b\n",
	},
	{
		`a=(b); echo ${a[3]}`,
		"\n",
	},
	{
		`a=(b); echo ${a[-2]}`,
		"negative array index\nexit status 1 #JUSTERR",
	},

// associative arrays
	{
		`a=foo; echo ${a[""]} ${a["x"]}`,
		"foo foo\n",
	},
	{
		`declare -A a=(); echo ${a[0]} ${a[@]} ${a[1]} ${a["x"]}`,
		"\n",
	},
	{
		`declare -A a=([x]=b [y]=c); echo $a; echo ${a[0]}; echo ${a["x"]}; echo ${a["_"]}`,
		"\n\nb\n\n",
	},
	{
		`declare -A a=([x]=b [y]=c); for e in ${a[@]}; do echo $e; done | sort`,
		"b\nc\n",
	},
	{
		`declare -A a=([y]=b [x]=c); for e in ${a[*]}; do echo $e; done | sort`,
		"b\nc\n",
	},
	{
		`declare -A a=([x]=a); a["y"]=d; a["x"]=c; for e in ${a[@]}; do echo $e; done | sort`,
		"c\nd\n",
	},
	{
		`declare -A a=([x]=a); a[y]=d; a[x]=c; for e in ${a[@]}; do echo $e; done | sort`,
		"c\nd\n",
	},
	{
		// cheating a little; bash just did a=c
		`a=(["x"]=b ["y"]=c); echo ${a["y"]}`,
		"c\n",
	},
	{
		`declare -A a=(['x']=b); echo ${a['x']} ${a[$'x']} ${a[$"x"]}`,
		"b b b\n",
	},
	{
		`a=(['x']=b); echo ${a['y']}`,
		"\n #IGNORE bash requires -A",
	},

// weird assignments
	{"a=b; a=(c d); echo ${a[@]}", "c d\n"},
	{"a=(b c); a=d; echo ${a[@]}", "d c\n"},
	{"declare -A a=([x]=b [y]=c); a=d; for e in ${a[@]}; do echo $e; done | sort", "b\nc\nd\n"},
	{"i=3; a=b; a[i]=x; echo ${a[@]}", "b x\n"},
	{"i=3; declare a=(b); a[i]=x; echo ${!a[@]}", "0 3\n"},
	{"i=3; declare -A a=(['x']=b); a[i]=x; for e in ${!a[@]}; do echo $e; done | sort", "i\nx\n"},

// declare
	{"declare -B foo", "declare: invalid option \"-B\"\nexit status 2 #JUSTERR"},
	{"a=b; declare a; echo $a; declare a=; echo $a", "b\n\n"},
	{"a=b; declare a; echo $a", "b\n"},
	{
		"declare a=b c=(1 2); echo $a; echo ${c[@]}",
		"b\n1 2\n",
	},
	{"a=x; declare $a; echo $a $x", "x\n"},
	{"a=x=y; declare $a; echo $a $x", "x=y y\n"},
	{"a='x=(y)'; declare $a; echo $a $x", "x=(y) (y)\n"},
	{"a='x=b y=c'; declare $a; echo $x $y", "b c\n"},
	{"declare =bar", "declare: invalid name \"\"\nexit status 1 #JUSTERR"},
	{"declare $unset=$unset", "declare: invalid name \"\"\nexit status 1 #JUSTERR"},

// export
	{"declare foo=bar; $ENV_PROG | grep '^foo='", "exit status 1"},
	{"declare -x foo=bar; $ENV_PROG | grep '^foo='", "foo=bar\n"},
	{"export foo=bar; $ENV_PROG | grep '^foo='", "foo=bar\n"},
	{"foo=bar; export foo; $ENV_PROG | grep '^foo='", "foo=bar\n"},
	{"export foo=bar; foo=baz; $ENV_PROG | grep '^foo='", "foo=baz\n"},
	{"export foo=bar; readonly foo=baz; $ENV_PROG | grep '^foo='", "foo=baz\n"},
	{"export foo=(1 2); $ENV_PROG | grep '^foo='", "exit status 1"},
	{"declare -A foo=([a]=b); export foo; $ENV_PROG | grep '^foo='", "exit status 1"},
	{"export foo=(b c); foo=x; $ENV_PROG | grep '^foo='", "exit status 1"},

// local
	{
		"local a=b",
		"local: can only be used in a function\nexit status 1 #JUSTERR",
	},
	{
		"local a=b 2>/dev/null; echo $a",
		"\n",
	},
	{
		"{ local a=b; }",
		"local: can only be used in a function\nexit status 1 #JUSTERR",
	},
	{
		"echo 'local a=b' >a; source a",
		"local: can only be used in a function\nexit status 1 #JUSTERR",
	},
	{
		"echo 'local a=b' >a; f() { source a; }; f; echo $a",
		"\n",
	},
	{
		"f() { local a=b; }; f; echo $a",
		"\n",
	},
	{
		"a=x; f() { local a=b; }; f; echo $a",
		"x\n",
	},
	{
		"a=x; f() { echo $a; local a=b; echo $a; }; f",
		"x\nb\n",
	},
	{
		"f1() { local a=b; }; f2() { f1; echo $a; }; f2",
		"\n",
	},
	{
		"f() { a=1; declare b=2; export c=3; readonly d=4; declare -g e=5; }; f; echo $a $b $c $d $e",
		"1 3 4 5\n",
	},
	{
		`f() { local x; [[ -v x ]] && echo set || echo unset; }; f`,
		"unset\n",
	},
	{
		`f() { local x=; [[ -v x ]] && echo set || echo unset; }; f`,
		"set\n",
	},
	{
		`export x=before; f() { local x; export x=after; $ENV_PROG | grep '^x='; }; f; echo $x`,
		"x=after\nbefore\n",
	},

// name references
	{"declare -n foo=bar; bar=etc; [[ -R foo ]]", ""},
	{"declare -n foo=bar; bar=etc; [ -R foo ]", ""},
	{"nameref foo=bar; bar=etc; [[ -R foo ]]", " #IGNORE"},
	{"declare foo=bar; bar=etc; [[ -R foo ]]", "exit status 1"},
	{
		"declare -n foo=bar; bar=etc; echo $foo; bar=zzz; echo $foo",
		"etc\nzzz\n",
	},
	{
		"declare -n foo=bar; bar=(x y); echo ${foo[1]}; bar=(a b); echo ${foo[1]}",
		"y\nb\n",
	},
	{
		"declare -n foo=bar; bar=etc; echo $foo; unset bar; echo $foo",
		"etc\n\n",
	},
	{
		"declare -n a1=a2 a2=a3 a3=a4; a4=x; echo $a1 $a3",
		"x x\n",
	},
	{
		"declare -n foo=bar bar=foo; echo $foo",
		"\n #IGNORE",
	},
	{
		"declare -n foo=bar; echo $foo",
		"\n",
	},
	{
		"declare -n foo=bar; echo ${!foo}",
		"bar\n",
	},
	{
		"declare -n foo=bar; bar=etc; echo $foo; echo ${!foo}",
		"etc\nbar\n",
	},
	{
		"declare -n foo=bar; bar=etc; foo=xxx; echo $foo $bar",
		"xxx xxx\n",
	},
	{
		"declare -n foo=bar; foo=xxx; echo $foo $bar",
		"xxx xxx\n",
	},
	// TODO: figure this one out
	//{
	//        "declare -n foo=bar bar=baz; foo=xxx; echo $foo $bar; echo $baz",
	//        "xxx xxx\nxxx\n",
	//},

// read-only vars
	{"declare -r foo=bar; echo $foo", "bar\n"},
	{"readonly foo=bar; echo $foo", "bar\n"},
	{"readonly foo=bar; export foo; echo $foo", "bar\n"},
	{"readonly foo=bar; readonly bar=foo; export foo bar; echo $bar", "foo\n"},
	{
		"a=b; a=c; echo $a; readonly a; a=d",
		"c\na: readonly variable\nexit status 1 #JUSTERR",
	},
	{
		"declare -r foo=bar; foo=etc",
		"foo: readonly variable\nexit status 1 #JUSTERR",
	},
	{
		"declare -r foo=bar; export foo=",
		"foo: readonly variable\nexit status 1 #JUSTERR",
	},
	{
		"readonly foo=bar; foo=etc",
		"foo: readonly variable\nexit status 1 #JUSTERR",
	},

// multiple var modes at once
	{
		"declare -r -x foo=bar; $ENV_PROG | grep '^foo='",
		"foo=bar\n",
	},
	{
		"declare -r -x foo=bar; foo=x",
		"foo: readonly variable\nexit status 1 #JUSTERR",
	},

// globbing
	{"echo .", ".\n"},
	{"echo ..", "..\n"},
	{"echo ./.", "./.\n"},
	{
		">a.x >b.x >c.x; echo *.x; rm a.x b.x c.x",
		"a.x b.x c.x\n",
	},
	{
		`>a.x; echo '*.x' "*.x"; rm a.x`,
		"*.x *.x\n",
	},
	{
		`>a.x >b.y; echo *'.'x; rm a.x`,
		"a.x\n",
	},
	{
		`>a.x; echo *'.x' "a."* '*'.x; rm a.x`,
		"a.x a.x *.x\n",
	},
	{
		"echo *.x; echo foo *.y bar",
		"*.x\nfoo *.y bar\n",
	},
	{
		"mkdir a; >a/b.x; echo */*.x | sed 's@\\\\@/@g'; cd a; echo *.x",
		"a/b.x\nb.x\n",
	},
	{
		"mkdir -p a/b/c; echo a/* | sed 's@\\\\@/@g'",
		"a/b\n",
	},
	{
		">.hidden >a; echo *; echo .h*; rm .hidden a",
		"a\n.hidden\n",
	},
	{
		`mkdir d; >d/.hidden >d/a; set -- "$(echo d/*)" "$(echo d/.h*)"; echo ${#1} ${#2}; rm -r d`,
		"3 9\n",
	},
	{
		"mkdir -p a/b/c; echo a/** | sed 's@\\\\@/@g'",
		"a/b\n",
	},
	{
		"shopt -s globstar; mkdir -p a/b/c; echo a/** | sed 's@\\\\@/@g'",
		"a/ a/b a/b/c\n",
	},
	{
		"shopt -s globstar; mkdir -p a/b/c; echo **/c | sed 's@\\\\@/@g'",
		"a/b/c\n",
	},
	{
		"cat <<EOF\n{foo,bar}\nEOF",
		"{foo,bar}\n",
	},
	{
		"cat <<EOF\n*.go\nEOF",
		"*.go\n",
	},
	{
		"mkdir -p a/b a/c; echo ./a/* | sed 's@\\\\@/@g'",
		"./a/b ./a/c\n",
	},
	{
		"mkdir -p a/b a/c d; cd d; echo ../a/* | sed 's@\\\\@/@g'",
		"../a/b ../a/c\n",
	},
	{
		"mkdir x-d1 x-d2; >x-f; echo x-*/ | sed 's@\\\\@/@g'",
		"x-d1/ x-d2/\n",
	},
	{
		"mkdir x-d1 x-d2; >x-f; echo ././x-*/// | sed 's@\\\\@/@g'",
		"././x-d1/ ././x-d2/\n",
	},
	{
		"mkdir -p x-d1/a x-d2/b; >x-f; echo x-*/* | sed 's@\\\\@/@g'",
		"x-d1/a x-d2/b\n",
	},
	{
		"mkdir -p foo/bar; ln -s foo sym; echo sy*/; echo sym/b*",
		"sym/\nsym/bar\n",
	},
	{
		">foo; ln -s foo sym; echo sy*; echo sy*/",
		"sym\nsy*/\n",
	},
	{
		"mkdir x-d; >x-f; test -d $PWD/x-*/",
		"",
	},
	{
		"mkdir dir; >dir/x-f; ln -s dir sym; cd sym; test -f $PWD/x-*",
		"",
	},

// brace expansion; more exhaustive tests in the syntax package
	{"echo a}b", "a}b\n"},
	{"echo {a,b{c,d}", "{a,bc {a,bd\n"},
	{"echo a{b}", "a{b}\n"},
	{"echo a{à,世界}", "aà a世界\n"},
	{"echo a{b,c}d{e,f}g", "abdeg abdfg acdeg acdfg\n"},
	{"echo a{b{x,y},c}d", "abxd abyd acd\n"},
	{"echo a{1..", "a{1..\n"},
	{"echo a{1..2}b{4..5}c", "a1b4c a1b5c a2b4c a2b5c\n"},
	{"echo a{c..f}", "ac ad ae af\n"},
	{"echo a{4..1..1}", "a4 a3 a2 a1\n"},

// tilde expansion
	{
		"[[ '~/foo' == ~/foo ]] || [[ ~/foo == '~/foo' ]]",
		"exit status 1",
	},
	{
		"case '~/foo' in ~/foo) echo match ;; esac",
		"",
	},
	{
		"a=~/foo; [[ $a == '~/foo' ]]",
		"exit status 1",
	},
	{
		`a=$(echo "~/foo"); [[ $a == '~/foo' ]]`,
		"",
	},

// /dev/null
	{"echo foo >/dev/null", ""},
	{"cat </dev/null", ""},

// time - real would be slow and flaky; see TestElapsedString
	{"{ time; } |& wc", "      4       6      42\n"},
	{"{ time echo -n; } |& wc", "      4       6      42\n"},
	{"{ time -p; } |& wc", "      3       6      29\n"},
	{"{ time -p echo -n; } |& wc", "      3       6      29\n"},

// exec
	{"exec", ""},
	{
		"exec builtin echo foo",
		"\"builtin\": executable file not found in $PATH\nexit status 127 #JUSTERR",
	},
	{
		"exec $GOSH_PROG 'echo foo'; echo bar",
		"foo\n",
	},

// read
	{
		"read </dev/null",
		"exit status 1",
	},
	{
		"read -X",
		"read: invalid option \"-X\"\nexit status 2 #JUSTERR",
	},
	{
		"read 0ab",
		"read: invalid identifier \"0ab\"\nexit status 2 #JUSTERR",
	},
	{
		"read <<< foo; echo $REPLY",
		"foo\n",
	},
	{
		"read <<<'  a  b  c  '; echo \"$REPLY\"",
		"  a  b  c  \n",
	},
	{
		"read <<< 'y\nn\n'; echo $REPLY",
		"y\n",
	},
	{
		"read a_0 <<< foo; echo $a_0",
		"foo\n",
	},
	{
		"read a b <<< 'foo  bar  baz  '; echo \"$a\"; echo \"$b\"",
		"foo\nbar  baz\n",
	},
	{
		"while read a; do echo $a; done <<< 'a\nb\nc'",
		"a\nb\nc\n",
	},
	{
		"while read a b; do echo -e \"$a\n$b\"; done <<< '1 2\n3'",
		"1\n2\n3\n\n",
	},
	{
		`read a <<< '\\'; echo "$a"`,
		"\\\n",
	},
	{
		`read a <<< '\a\b\c'; echo "$a"`,
		"abc\n",
	},
	{
		"read -r a b <<< '1\\\t2'; echo $a; echo $b;",
		"1\\\n2\n",
	},
	{
		"echo line\\\ncontinuation | while read a; do echo $a; done",
		"linecontinuation\n",
	},
	{
		`read -r a <<< '\\'; echo "$a"`,
		"\\\\\n",
	},
	{
		"read -r a <<< '\\a\\b\\c'; echo $a",
		"\\a\\b\\c\n",
	},
	{
		"IFS=: read a b c <<< '1:2:3'; echo $a; echo $b; echo $c",
		"1\n2\n3\n",
	},
	{
		"IFS=: read a b c <<< '1\\:2:3'; echo \"$a\"; echo $b; echo $c",
		"1:2\n3\n\n",
	},

// getopts
	{
		"getopts",
		"getopts: usage: getopts optstring name [arg]\nexit status 2",
	},
	{
		"getopts a a:b",
		"getopts: invalid identifier: \"a:b\"\nexit status 2 #JUSTERR",
	},
	{
		"getopts abc opt -a; echo $opt; $optarg",
		"a\n",
	},
	{
		"getopts abc opt -z",
		"getopts: illegal option -- \"z\"\n #IGNORE",
	},
	{
		"getopts a: opt -a",
		"getopts: option requires an argument -- \"a\"\n #IGNORE",
	},
	{
		"getopts :abc opt -z; echo $opt; echo $OPTARG",
		"?\nz\n",
	},
	{
		"getopts :a: opt -a; echo $opt; echo $OPTARG",
		":\na\n",
	},
	{
		"getopts abc opt foo -a; echo $opt; echo $OPTIND",
		"?\n1\n",
	},
	{
		"getopts abc opt -a foo; echo $opt; echo $OPTIND",
		"a\n2\n",
	},
	{
		"OPTIND=3; getopts abc opt -a -b -c; echo $opt;",
		"c\n",
	},
	{
		"OPTIND=100; getopts abc opt -a -b -c; echo $opt;",
		"?\n",
	},
	{
		"OPTIND=foo; getopts abc opt -a -b -c; echo $opt;",
		"a\n",
	},
	{
		"while getopts ab:c opt -c -b arg -a foo; do echo $opt $OPTARG $OPTIND; done",
		"c 2\nb arg 4\na 5\n",
	},
	{
		"while getopts abc opt -ba -c foo; do echo $opt $OPTARG $OPTIND; done",
		"b 1\na 2\nc 3\n",
	},
	{
		"a() { while getopts abc: opt; do echo $opt $OPTARG; done }; a -a -b -c arg",
		"a\nb\nc arg\n",
	},
}

var runTestsUnix = []runTest{
	{"[[ -n $PPID && $PPID -gt 0 ]]", ""},
	{
		// no root user on windows
		"[[ ~root == '~root' ]]",
		"exit status 1",
	},

// windows does not support paths with '*'
	{
		"mkdir -p '*/a.z' 'b/a.z'; cd '*'; set -- *.z; echo $#",
		"1\n",
	},
	{
		"mkdir -p 'a-*/d'; test -d $PWD/a-*/*",
		"",
	},

// no fifos on windows
	{
		"[ -p a ] && echo x; mkfifo a; [ -p a ] && echo y",
		"y\n",
	},
	{
		"[[ -p a ]] && echo x; mkfifo a; [[ -p a ]] && echo y",
		"y\n",
	},

{"sh() { :; }; sh -c 'echo foo'", ""},
	{"sh() { :; }; command sh -c 'echo foo'", "foo\n"},

// chmod is practically useless on Windows
	{
		"[ -x a ] && echo x; >a; chmod 0755 a; [ -x a ] && echo y",
		"y\n",
	},
	{
		"[[ -x a ]] && echo x; >a; chmod 0755 a; [[ -x a ]] && echo y",
		"y\n",
	},
	{
		">a; [ -k a ] && echo x; chmod +t a; [ -k a ] && echo y",
		"y\n",
	},
	{
		">a; [ -u a ] && echo x; chmod u+s a; [ -u a ] && echo y",
		"y\n",
	},
	{
		">a; [ -g a ] && echo x; chmod g+s a; [ -g a ] && echo y",
		"y\n",
	},
	{
		">a; [[ -k a ]] && echo x; chmod +t a; [[ -k a ]] && echo y",
		"y\n",
	},
	{
		">a; [[ -u a ]] && echo x; chmod u+s a; [[ -u a ]] && echo y",
		"y\n",
	},
	{
		">a; [[ -g a ]] && echo x; chmod g+s a; [[ -g a ]] && echo y",
		"y\n",
	},
	{
		`mkdir a; chmod 0100 a; cd a`,
		"",
	},
	// Note that these will succeed if we're root.
	{
		`mkdir a; chmod 0000 a; cd a && test $UID -ne 0`,
		"exit status 1 #JUSTERR",
	},
	{
		`mkdir a; chmod 0222 a; cd a && test $UID -ne 0`,
		"exit status 1 #JUSTERR",
	},
	{
		`mkdir a; chmod 0444 a; cd a && test $UID -ne 0`,
		"exit status 1 #JUSTERR",
	},
	{
		`mkdir a; chmod 0010 a; cd a && test $UID -ne 0`,
		"exit status 1 #JUSTERR",
	},
	{
		`mkdir a; chmod 0001 a; cd a && test $UID -ne 0`,
		"exit status 1 #JUSTERR",
	},

// Unix-y PATH
	{
		"PATH=; bash -c 'echo foo'",
		"\"bash\": executable file not found in $PATH\nexit status 127 #JUSTERR",
	},
	{
		"cd /; sure/is/missing",
		"stat /sure/is/missing: no such file or directory\nexit status 127 #JUSTERR",
	},
	{
		"echo '#!/bin/sh\necho b' >a; chmod 0755 a; PATH=; a",
		"b\n",
	},
	{
		"mkdir c; cd c; echo '#!/bin/sh\necho b' >a; chmod 0755 a; PATH=; a",
		"b\n",
	},
	{
		"mkdir c; echo '#!/bin/sh\necho b' >c/a; chmod 0755 c/a; c/a",
		"b\n",
	},

// process substitution; named pipes (fifos) are a TODO for windows
	{
		"sed 's/o/e/g' <(echo foo bar)",
		"fee bar\n",
	},
	{
		"cat <(echo foo) <(echo bar) <(echo baz)",
		"foo\nbar\nbaz\n",
	},
	{
		"cat <(cat <(echo nested))",
		"nested\n",
	},
	{
		"echo foo bar > >(sed 's/o/e/g')",
		"fee bar\n",
	},
	{
		"echo foo bar | tee >(sed 's/o/e/g') >/dev/null",
		"fee bar\n",
	},
	{
		"echo nested > >(cat > >(cat))",
		"nested\n",
	},
}

// These tests are specific to 64-bit architectures, and that's fine. We don't
// need to add explicit versions for 32-bit.
var runTests64bit = []runTest{
	{"printf %i,%u -3 -3", "-3,18446744073709551613"},
	{"printf %o -3", "1777777777777777777775"},
	{"printf %x -3", "fffffffffffffffd"},
}

func init() {
	if runtime.GOOS == "windows" {
		runTests = append(runTests, runTestsWindows...)
	} else { // Unix-y
		runTests = append(runTests, runTestsUnix...)
	}
	if bits.UintSize == 64 {
		runTests = append(runTests, runTests64bit...)
	}
}

// ln -s: wine doesn't implement symlinks; see https://bugs.winehq.org/show_bug.cgi?id=44948
var skipOnWindows = regexp.MustCompile(`ln -s`)

// process substitutions seemflaky on mac; see https://github.com/mvdan/sh/issues/576
var skipOnMac = regexp.MustCompile(`>\(|<\(`)

func skipIfUnsupported(tb testing.TB, src string) {
	switch {
	case runtime.GOOS == "windows" && skipOnWindows.MatchString(src):
		tb.Skipf("skipping non-portable test on windows")
	case runtime.GOOS == "darwin" && skipOnMac.MatchString(src):
		tb.Skipf("skipping non-portable test on mac")
	}
}

func TestRunnerRun(t *testing.T) {
	p := syntax.NewParser()
	for i := range runTests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			c := runTests[i]
			skipIfUnsupported(t, c.in)
			file := parse(t, p, c.in)
			t.Parallel()
			dir, err := ioutil.TempDir("", "interp-test")
			if err != nil {
				t.Fatal(err)
			}
			defer os.RemoveAll(dir)
			var cb concBuffer
			r, err := New(Dir(dir), StdIO(nil, &cb, &cb),
				OpenHandler(testOpenHandler),
				ExecHandler(testExecHandler),
			)
			if err != nil {
				t.Fatal(err)
			}
			ctx := context.Background()
			if err := r.Run(ctx, file); err != nil {
				cb.WriteString(err.Error())
			}
			want := c.want
			if i := strings.Index(want, " #"); i >= 0 {
				want = want[:i]
			}
			if got := cb.String(); got != want {
				t.Fatalf("wrong output in %q:\nwant: %q\ngot:  %q",
					c.in, want, got)
			}
		})
	}
}

func readLines(hc HandlerContext) ([][]byte, error) {
	bs, err := ioutil.ReadAll(hc.Stdin)
	if err != nil {
		return nil, err
	}
	if runtime.GOOS == "windows" {
		bs = bytes.Replace(bs, []byte("\r\n"), []byte("\n"), -1)
	}
	bs = bytes.TrimSuffix(bs, []byte("\n"))
	return bytes.Split(bs, []byte("\n")), nil
}

func testExecHandler(ctx context.Context, args []string) error {
	if fn := testBuiltinsMap[args[0]]; fn != nil {
		return fn(HandlerCtx(ctx), args[1:])
	}
	return DefaultExecHandler(2*time.Second)(ctx, args)
}

func testOpenHandler(ctx context.Context, path string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {
	if runtime.GOOS == "windows" && path == "/dev/null" {
		path = "NUL"
	}

return DefaultOpenHandler()(ctx, path, flag, perm)
}

func TestRunnerRunConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling bash is slow")
	}
	if !hasBash50 {
		t.Skip("bash 5.0 required to run")
	}
	if runtime.GOOS == "windows" {
		// For example, it seems to treat environment variables as
		// case-sensitive, which isn't how Windows works.
		t.Skip("bash on Windows emulates Unix-y behavior")
	}
	for i := range runTests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			c := runTests[i]
			if strings.Contains(c.want, " #IGNORE") {
				return
			}
			skipIfUnsupported(t, c.in)
			t.Parallel()
			dir, err := ioutil.TempDir("", "interp-test")
			if err != nil {
				t.Fatal(err)
			}
			defer os.RemoveAll(dir)
			cmd := exec.Command("bash")
			cmd.Dir = dir
			cmd.Stdin = strings.NewReader(c.in)
			out, err := cmd.CombinedOutput()
			if strings.Contains(c.want, " #JUSTERR") {
				// bash sometimes exits with status code 0 and
				// stderr "bash: ..." for an error
				fauxErr := bytes.HasPrefix(out, []byte("bash:"))
				if err == nil && !fauxErr {
					t.Fatalf("wanted bash to error in %q", c.in)
				}
				return
			}
			got := string(out)
			if err != nil {
				got += err.Error()
			}
			if got != c.want {
				t.Fatalf("wrong bash output in %q:\nwant: %q\ngot:  %q",
					c.in, c.want, got)
			}
		})
	}
}

func TestRunnerOpts(t *testing.T) {
	t.Parallel()
	withPath := func(strs ...string) func(*Runner) error {
		prefix := []string{
			"PATH=" + os.Getenv("PATH"),
			"ENV_PROG=" + os.Getenv("ENV_PROG"),
		}
		return Env(expand.ListEnviron(append(prefix, strs...)...))
	}
	opts := func(list ...RunnerOption) []RunnerOption {
		return list
	}
	cases := []struct {
		opts     []RunnerOption
		in, want string
	}{
		{
			nil,
			"$ENV_PROG | grep '^INTERP_GLOBAL='",
			"INTERP_GLOBAL=value\n",
		},
		{
			opts(withPath()),
			"$ENV_PROG | grep '^INTERP_GLOBAL='",
			"exit status 1",
		},
		{
			opts(withPath("INTERP_GLOBAL=bar")),
			"$ENV_PROG | grep '^INTERP_GLOBAL='",
			"INTERP_GLOBAL=bar\n",
		},
		{
			opts(withPath("a=b")),
			"echo $a",
			"b\n",
		},
		{
			opts(withPath("A=b")),
			"$ENV_PROG | grep '^A='; echo $A",
			"A=b\nb\n",
		},
		{
			opts(withPath("A=b", "A=c")),
			"$ENV_PROG | grep '^A='; echo $A",
			"A=c\nc\n",
		},
		{
			opts(withPath("HOME=")),
			"echo $HOME",
			"\n",
		},
		{
			opts(withPath("PWD=foo")),
			"[[ $PWD == foo ]]",
			"exit status 1",
		},
		{
			opts(Params("foo")),
			"echo $@",
			"foo\n",
		},
		{
			opts(Params("-u", "--", "foo")),
			"echo $@; echo $unset",
			"foo\nunset: unbound variable\nexit status 1",
		},
		{
			opts(Params("foo")),
			"set >/dev/null; echo $@",
			"foo\n",
		},
		{
			opts(Params("foo")),
			"set -e; echo $@",
			"foo\n",
		},
		{
			opts(Params("foo")),
			"set --; echo $@",
			"\n",
		},
		{
			opts(Params("foo")),
			"set bar; echo $@",
			"bar\n",
		},
	}
	p := syntax.NewParser()
	for i, c := range cases {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			skipIfUnsupported(t, c.in)
			file := parse(t, p, c.in)
			var cb concBuffer
			r, err := New(append(c.opts,
				StdIO(nil, &cb, &cb),
				OpenHandler(testOpenHandler),
				ExecHandler(testExecHandler),
			)...)
			if err != nil {
				t.Fatal(err)
			}
			ctx := context.Background()
			if err := r.Run(ctx, file); err != nil {
				cb.WriteString(err.Error())
			}
			if got := cb.String(); got != c.want {
				t.Fatalf("wrong output in %q:\nwant: %q\ngot:  %q",
					c.in, c.want, got)
			}
		})
	}
}

func TestRunnerContext(t *testing.T) {
	t.Parallel()
	cases := []string{
		"",
		"while true; do true; done",
		"until false; do true; done",
		"sleep 1000",
		"while true; do true; done & wait",
		"sleep 1000 & wait",
		"(while true; do true; done)",
		"$(while true; do true; done)",
		"while true; do true; done | while true; do true; done",
	}
	p := syntax.NewParser()
	for i, in := range cases {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			file := parse(t, p, in)
			ctx, cancel := context.WithCancel(context.Background())
			cancel()
			r, _ := New()
			errChan := make(chan error)
			go func() {
				errChan <- r.Run(ctx, file)
			}()

timeout := 500 * time.Millisecond
			select {
			case err := <-errChan:
				if err != nil && err != ctx.Err() {
					t.Fatal("Runner did not use ctx.Err()")
				}
			case <-time.After(timeout):
				t.Fatalf("program was not killed in %s", timeout)
			}
		})
	}
}

func TestRunnerAltNodes(t *testing.T) {
	t.Parallel()
	in := "echo foo"
	file := parse(t, nil, in)
	want := "foo\n"
	nodes := []syntax.Node{
		file,
		file.Stmts[0],
		file.Stmts[0].Cmd,
	}
	for _, node := range nodes {
		var cb concBuffer
		r, _ := New(StdIO(nil, &cb, &cb))
		ctx := context.Background()
		if err := r.Run(ctx, node); err != nil {
			cb.WriteString(err.Error())
		}
		if got := cb.String(); got != want {
			t.Fatalf("wrong output in %q:\nwant: %q\ngot:  %q",
				in, want, got)
		}
	}
}

func TestElapsedString(t *testing.T) {
	t.Parallel()
	tests := []struct {
		in    time.Duration
		posix bool
		want  string
	}{
		{time.Nanosecond, false, "0m0.000s"},
		{time.Millisecond, false, "0m0.001s"},
		{time.Millisecond, true, "0.00"},
		{2500 * time.Millisecond, false, "0m2.500s"},
		{2500 * time.Millisecond, true, "2.50"},
		{
			10*time.Minute + 10*time.Second,
			false,
			"10m10.000s",
		},
		{
			10*time.Minute + 10*time.Second,
			true,
			"610.00",
		},
	}
	for _, tc := range tests {
		t.Run(tc.in.String(), func(t *testing.T) {
			got := elapsedString(tc.in, tc.posix)
			if got != tc.want {
				t.Fatalf("wanted %q, got %q", tc.want, got)
			}
		})
	}
}

func TestRunnerDir(t *testing.T) {
	t.Parallel()
	wd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}
	t.Run("Missing", func(t *testing.T) {
		_, err := New(Dir("missing"))
		if err == nil {
			t.Fatal("expected New to error when Dir is missing")
		}
	})
	t.Run("NotDir", func(t *testing.T) {
		_, err := New(Dir("interp_test.go"))
		if err == nil {
			t.Fatal("expected New to error when Dir is not a dir")
		}
	})
	t.Run("NotDirAbs", func(t *testing.T) {
		_, err := New(Dir(filepath.Join(wd, "interp_test.go")))
		if err == nil {
			t.Fatal("expected New to error when Dir is not a dir")
		}
	})
	t.Run("Relative", func(t *testing.T) {
		// On Windows, it's impossible to make a relative path from one
		// drive to another. Use the parent directory, as that's for
		// sure in the same drive as the current directory.
		rel := ".." + string(filepath.Separator)
		r, err := New(Dir(rel))
		if err != nil {
			t.Fatal(err)
		}
		if !filepath.IsAbs(r.Dir) {
			t.Errorf("Runner.Dir is not absolute")
		}
	})
	// Ensure that we treat symlinks and short paths properly, especially
	// with Dir and globbing.
	t.Run("SymlinkOrShortPath", func(t *testing.T) {
		tempDir, err := ioutil.TempDir("", "interp-test")
		if err != nil {
			t.Fatal(err)
		}
		defer os.RemoveAll(tempDir)

realDir := filepath.Join(tempDir, "real-long-dir-name")
		realFile := filepath.Join(realDir, "realfile")

if err := os.Mkdir(realDir, 0o777); err != nil {
			t.Fatal(err)
		}
		if err := ioutil.WriteFile(realFile, []byte(""), 0o666); err != nil {
			t.Fatal(err)
		}

var altDir string
		if runtime.GOOS == "windows" {
			short, err := shortPathName(realDir)
			if err != nil {
				t.Fatal(err)
			}
			altDir = short
			// We replace tempDir later, and it might have been
			// shortened.
			tempDir = filepath.Dir(altDir)
		} else {
			altDir = filepath.Join(tempDir, "symlink")
			if err := os.Symlink(realDir, altDir); err != nil {
				t.Fatal(err)
			}
		}

var b bytes.Buffer
		r, err := New(Dir(altDir), StdIO(nil, &b, &b))
		if err != nil {
			t.Fatal(err)
		}
		file := parse(t, nil, "echo $PWD $PWD/*")
		ctx := context.Background()
		if err := r.Run(ctx, file); err != nil {
			t.Fatal(err)
		}
		got := b.String()
		got = strings.Replace(got, tempDir, "", -1)
		got = strings.TrimSpace(got)
		want := `/symlink /symlink/realfile`
		if runtime.GOOS == "windows" {
			want = `\\REAL.{4} \\REAL.{4}\\realfile`
		}
		if !regexp.MustCompile(want).MatchString(got) {
			t.Fatalf("\nwant regexp: %q\ngot: %q", want, got)
		}
	})
}

func TestRunnerIncremental(t *testing.T) {
	t.Parallel()
	file := parse(t, nil, "echo foo; false; echo bar; exit 0; echo baz")
	want := "foo\nbar\n"
	var b bytes.Buffer
	r, _ := New(StdIO(nil, &b, &b))
	ctx := context.Background()
	for _, stmt := range file.Stmts {
		err := r.Run(ctx, stmt)
		if _, ok := IsExitStatus(err); !ok && err != nil {
			// Keep track of unexpected errors.
			b.WriteString(err.Error())
		}
		if r.Exited() {
			break
		}
	}
	if got := b.String(); got != want {
		t.Fatalf("\nwant: %q\ngot:  %q", want, got)
	}
}

func TestRunnerResetFields(t *testing.T) {
	t.Parallel()
	dir, err := ioutil.TempDir("", "interp")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)
	logPath := filepath.Join(dir, "log")
	logFile, err := os.Create(logPath)
	if err != nil {
		t.Fatal(err)
	}
	defer logFile.Close()
	r, _ := New(
		Params("-f", "--", "first", dir, logPath),
		Dir(dir),
		OpenHandler(testOpenHandler),
		ExecHandler(testExecHandler),
	)
	// Check that using option funcs and Runner fields directly is still
	// kept by Reset.
	StdIO(nil, logFile, os.Stderr)(r)
	r.Env = expand.ListEnviron(append(os.Environ(), "GLOBAL=foo")...)

file := parse(t, nil, `
# Params set 3 arguments
[[ $# -eq 3 ]] || exit 10
[[ $1 == "first" ]] || exit 11

# Params set the -f option (noglob)
[[ -o noglob ]] || exit 12

# $PWD was set via Dir, and should be equal to $2
[[ "$PWD" == "$2" ]] || exit 13

# stdout should go into the log file, which is at $3
echo line1
echo line2
[[ "$(wc -l <$3)" == "2" ]] || exit 14

# $GLOBAL was set directly via the Env field
[[ "$GLOBAL" == "foo" ]] || exit 15

# Change all of the above within the script. Reset should undo this.
set +f -- newargs
cd
exec >/dev/null 2>/dev/null
GLOBAL=
export GLOBAL=
`)
	ctx := context.Background()
	for i := 0; i < 3; i++ {
		if err := r.Run(ctx, file); err != nil {
			t.Fatalf("run number %d: %v", i, err)
		}
		r.Reset()
		// empty the log file too
		logFile.Truncate(0)
		logFile.Seek(0, io.SeekStart)
	}
}

func TestRunnerManyResets(t *testing.T) {
	t.Parallel()
	r, _ := New()
	for i := 0; i < 5; i++ {
		r.Reset()
	}
}

func TestRunnerFilename(t *testing.T) {
	t.Parallel()
	want := "f.sh\n"
	file, _ := syntax.NewParser().Parse(strings.NewReader("echo $0"), "f.sh")
	var b bytes.Buffer
	r, _ := New(StdIO(nil, &b, &b))
	ctx := context.Background()
	if err := r.Run(ctx, file); err != nil {
		t.Fatal(err)
	}
	if got := b.String(); got != want {
		t.Fatalf("\nwant: %q\ngot:  %q", want, got)
	}
}

func TestRunnerEnvNoModify(t *testing.T) {
	t.Parallel()
	env := expand.ListEnviron("one=1", "two=2")
	file := parse(t, nil, `echo -n "$one $two; "; one=x; unset two`)

var b bytes.Buffer
	r, _ := New(Env(env), StdIO(nil, &b, &b))
	ctx := context.Background()
	for i := 0; i < 3; i++ {
		r.Reset()
		err := r.Run(ctx, file)
		if err != nil {
			t.Fatal(err)
		}
	}

want := "1 2; 1 2; 1 2; "
	if got := b.String(); got != want {
		t.Fatalf("\nwant: %q\ngot:  %q", want, got)
	}
}

func TestMalformedPathOnWindows(t *testing.T) {
	if runtime.GOOS != "windows" {
		t.Skip("Skipping windows test on non-windows GOOS")
	}
	dir, err := ioutil.TempDir("", "interp-test")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)

path := filepath.Join(dir, "test.cmd")
	script := []byte("@echo foo")
	if err := ioutil.WriteFile(path, script, 0o777); err != nil {
		t.Fatal(err)
	}

// set PATH to c:\tmp\dir instead of C:\tmp\dir
	volume := filepath.VolumeName(dir)
	pathList := strings.ToLower(volume) + dir[len(volume):]

file := parse(t, nil, "test.cmd")
	var cb concBuffer
	r, _ := New(Env(expand.ListEnviron("PATH="+pathList)), StdIO(nil, &cb, &cb))
	if err := r.Run(context.Background(), file); err != nil {
		t.Fatal(err)
	}
	want := "foo\r\n"
	if got := cb.String(); got != want {
		t.Fatalf("wrong output:\nwant: %q\ngot:  %q", want, got)
	}
}
07070100000042000081A4000003E800000064000000016046124D0000041F000000000000000000000000000000000000001B00000000sh-3.2.4/interp/os_unix.go// Copyright (c) 2017, Andrey Nering <andrey.nering@gmail.com>
// See LICENSE for licensing information

// +build !windows

package interp

import (
	"os"
	"os/user"
	"strconv"
	"syscall"

"golang.org/x/sys/unix"
)

func mkfifo(path string, mode uint32) error {
	return unix.Mkfifo(path, mode)
}

// hasPermissionToDir returns if the OS current user has execute permission
// to the given directory
func hasPermissionToDir(info os.FileInfo) bool {
	user, err := user.Current()
	if err != nil {
		return true
	}
	uid, _ := strconv.Atoi(user.Uid)
	// super-user
	if uid == 0 {
		return true
	}

st, _ := info.Sys().(*syscall.Stat_t)
	if st == nil {
		return true
	}
	perm := info.Mode().Perm()
	// user (u)
	if perm&0o100 != 0 && st.Uid == uint32(uid) {
		return true
	}

gid, _ := strconv.Atoi(user.Gid)
	// other users in group (g)
	if perm&0o010 != 0 && st.Uid != uint32(uid) && st.Gid == uint32(gid) {
		return true
	}
	// remaining users (o)
	if perm&0o001 != 0 && st.Uid != uint32(uid) && st.Gid != uint32(gid) {
		return true
	}

return false
}
07070100000043000081A4000003E800000064000000016046124D00000152000000000000000000000000000000000000001E00000000sh-3.2.4/interp/os_windows.go// Copyright (c) 2017, Andrey Nering <andrey.nering@gmail.com>
// See LICENSE for licensing information

package interp

import (
	"fmt"
	"os"
)

func mkfifo(path string, mode uint32) error {
	return fmt.Errorf("unsupported")
}

// hasPermissionToDir is a no-op on Windows.
func hasPermissionToDir(info os.FileInfo) bool {
	return true
}
07070100000044000081A4000003E800000064000000016046124D00004338000000000000000000000000000000000000001A00000000sh-3.2.4/interp/runner.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"io/ioutil"
	"math"
	"math/rand"
	"os"
	"regexp"
	"runtime"
	"strings"
	"sync"
	"time"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/pattern"
	"mvdan.cc/sh/v3/syntax"
)

func (r *Runner) fillExpandConfig(ctx context.Context) {
	r.ectx = ctx
	r.ecfg = &expand.Config{
		Env: expandEnv{r},
		CmdSubst: func(w io.Writer, cs *syntax.CmdSubst) error {
			switch len(cs.Stmts) {
			case 0: // nothing to do
				return nil
			case 1: // $(<file)
				word := catShortcutArg(cs.Stmts[0])
				if word == nil {
					break
				}
				path := r.literal(word)
				f, err := r.open(ctx, path, os.O_RDONLY, 0, true)
				if err != nil {
					return err
				}
				_, err = io.Copy(w, f)
				return err
			}
			r2 := r.Subshell()
			r2.stdout = w
			r2.stmts(ctx, cs.Stmts)
			return r2.err
		},
		ProcSubst: func(ps *syntax.ProcSubst) (string, error) {
			if runtime.GOOS == "windows" {
				return "", fmt.Errorf("TODO: support process substitution on Windows")
			}
			if len(ps.Stmts) == 0 { // nothing to do
				return os.DevNull, nil
			}

if r.rand == nil {
				r.rand = rand.New(rand.NewSource(time.Now().UnixNano()))
			}
			dir := os.TempDir()
			path := fmt.Sprintf("%s/sh-interp-%d", dir, r.rand.Uint32())
			if err := mkfifo(path, 0o666); err != nil {
				return "", fmt.Errorf("cannot create fifo: %v", err)
			}
			r2 := r.Subshell()
			stdout := r.origStdout
			r.wgProcSubsts.Add(1)
			go func() {
				defer r.wgProcSubsts.Done()
				switch ps.Op {
				case syntax.CmdIn:
					f, err := os.OpenFile(path, os.O_WRONLY, 0)
					if err != nil {
						r.errf("cannot open fifo for stdout: %v", err)
						return
					}
					r2.stdout = f
					defer func() {
						if err := f.Close(); err != nil {
							r.errf("closing stdout fifo: %v", err)
						}
						os.Remove(path)
					}()
				default: // syntax.CmdOut
					f, err := os.OpenFile(path, os.O_RDONLY, 0)
					if err != nil {
						r.errf("cannot open fifo for stdin: %v", err)
						return
					}
					r2.stdin = f
					r2.stdout = stdout

defer func() {
						f.Close()
						os.Remove(path)
					}()
				}
				r2.stmts(ctx, ps.Stmts)
			}()
			return path, nil
		},
	}
	r.updateExpandOpts()
}

// catShortcutArg checks if a statement is of the form "$(<file)". The redirect
// word is returned if there's a match, and nil otherwise.
func catShortcutArg(stmt *syntax.Stmt) *syntax.Word {
	if stmt.Cmd != nil || stmt.Negated || stmt.Background || stmt.Coprocess {
		return nil
	}
	if len(stmt.Redirs) != 1 {
		return nil
	}
	redir := stmt.Redirs[0]
	if redir.Op != syntax.RdrIn {
		return nil
	}
	return redir.Word
}

func (r *Runner) updateExpandOpts() {
	if r.opts[optNoGlob] {
		r.ecfg.ReadDir = nil
	} else {
		r.ecfg.ReadDir = ioutil.ReadDir
	}
	r.ecfg.GlobStar = r.opts[optGlobStar]
}

func (r *Runner) expandErr(err error) {
	if err != nil {
		r.errf("%v\n", err)
		r.exit = 1
		r.exitShell = true
	}
}

func (r *Runner) arithm(expr syntax.ArithmExpr) int {
	n, err := expand.Arithm(r.ecfg, expr)
	r.expandErr(err)
	return n
}

func (r *Runner) fields(words ...*syntax.Word) []string {
	strs, err := expand.Fields(r.ecfg, words...)
	r.expandErr(err)
	return strs
}

func (r *Runner) literal(word *syntax.Word) string {
	str, err := expand.Literal(r.ecfg, word)
	r.expandErr(err)
	return str
}

func (r *Runner) document(word *syntax.Word) string {
	str, err := expand.Document(r.ecfg, word)
	r.expandErr(err)
	return str
}

func (r *Runner) pattern(word *syntax.Word) string {
	str, err := expand.Pattern(r.ecfg, word)
	r.expandErr(err)
	return str
}

// expandEnv exposes Runner's variables to the expand package.
type expandEnv struct {
	r *Runner
}

var _ expand.WriteEnviron = expandEnv{}

func (e expandEnv) Get(name string) expand.Variable {
	return e.r.lookupVar(name)
}

func (e expandEnv) Set(name string, vr expand.Variable) error {
	e.r.setVarInternal(name, vr)
	return nil // TODO: return any errors
}

func (e expandEnv) Each(fn func(name string, vr expand.Variable) bool) {
	e.r.Env.Each(fn)
	for name, vr := range e.r.Vars {
		if !fn(name, vr) {
			return
		}
	}
}

func (r *Runner) handlerCtx(ctx context.Context) context.Context {
	hc := HandlerContext{
		Dir:    r.Dir,
		Stdin:  r.stdin,
		Stdout: r.stdout,
		Stderr: r.stderr,
	}
	oenv := overlayEnviron{
		parent: r.Env,
		values: make(map[string]expand.Variable),
	}
	for name, vr := range r.Vars {
		oenv.Set(name, vr)
	}
	for name, vr := range r.funcVars {
		oenv.Set(name, vr)
	}
	for name, value := range r.cmdVars {
		oenv.Set(name, expand.Variable{Exported: true, Kind: expand.String, Str: value})
	}
	hc.Env = oenv
	return context.WithValue(ctx, handlerCtxKey{}, hc)
}

func (r *Runner) setErr(err error) {
	if r.err == nil {
		r.err = err
	}
}

func (r *Runner) out(s string) {
	io.WriteString(r.stdout, s)
}

func (r *Runner) outf(format string, a ...interface{}) {
	fmt.Fprintf(r.stdout, format, a...)
}

func (r *Runner) errf(format string, a ...interface{}) {
	fmt.Fprintf(r.stderr, format, a...)
}

func (r *Runner) stop(ctx context.Context) bool {
	if r.err != nil || r.exitShell {
		return true
	}
	if err := ctx.Err(); err != nil {
		r.err = err
		return true
	}
	if r.opts[optNoExec] {
		return true
	}
	return false
}

func (r *Runner) stmt(ctx context.Context, st *syntax.Stmt) {
	if r.stop(ctx) {
		return
	}
	r.exit = 0
	if st.Background {
		r2 := r.Subshell()
		st2 := *st
		st2.Background = false
		r.bgShells.Go(func() error {
			return r2.Run(ctx, &st2)
		})
	} else {
		r.stmtSync(ctx, st)
	}
	r.lastExit = r.exit
}

func (r *Runner) stmtSync(ctx context.Context, st *syntax.Stmt) {
	defer r.wgProcSubsts.Wait()
	oldIn, oldOut, oldErr := r.stdin, r.stdout, r.stderr
	for _, rd := range st.Redirs {
		cls, err := r.redir(ctx, rd)
		if err != nil {
			r.exit = 1
			return
		}
		if cls != nil {
			defer cls.Close()
		}
	}
	if st.Cmd != nil {
		r.cmd(ctx, st.Cmd)
	}
	if st.Negated {
		r.exit = oneIf(r.exit == 0)
	} else if _, ok := st.Cmd.(*syntax.CallExpr); !ok {
	} else if r.exit != 0 && !r.noErrExit && r.opts[optErrExit] {
		// If the "errexit" option is set and a simple command failed,
		// exit the shell. Exceptions:
		//
		//   conditions (if <cond>, while <cond>, etc)
		//   part of && or || lists
		//   preceded by !
		r.exitShell = true
	}
	if !r.keepRedirs {
		r.stdin, r.stdout, r.stderr = oldIn, oldOut, oldErr
	}
}

func (r *Runner) cmd(ctx context.Context, cm syntax.Command) {
	if r.stop(ctx) {
		return
	}
	switch x := cm.(type) {
	case *syntax.Block:
		r.stmts(ctx, x.Stmts)
	case *syntax.Subshell:
		r2 := r.Subshell()
		r2.stmts(ctx, x.Stmts)
		r.exit = r2.exit
		r.setErr(r2.err)
	case *syntax.CallExpr:
		// Use a new slice, to not modify the slice in the alias map.
		var args []*syntax.Word
		left := x.Args
		for len(left) > 0 && r.opts[optExpandAliases] {
			als, ok := r.alias[left[0].Lit()]
			if !ok {
				break
			}
			args = append(args, als.args...)
			left = left[1:]
			if !als.blank {
				break
			}
		}
		args = append(args, left...)
		fields := r.fields(args...)
		if len(fields) == 0 {
			for _, as := range x.Assigns {
				vr := r.assignVal(as, "")
				r.setVar(as.Name.Value, as.Index, vr)
			}
			break
		}
		for _, as := range x.Assigns {
			vr := r.assignVal(as, "")
			// we know that inline vars must be strings
			r.cmdVars[as.Name.Value] = vr.Str
		}
		r.call(ctx, x.Args[0].Pos(), fields)
		// cmdVars can be nuked here, as they are never useful
		// again once we nest into further levels of inline
		// vars.
		for k := range r.cmdVars {
			delete(r.cmdVars, k)
		}
	case *syntax.BinaryCmd:
		switch x.Op {
		case syntax.AndStmt, syntax.OrStmt:
			oldNoErrExit := r.noErrExit
			r.noErrExit = true
			r.stmt(ctx, x.X)
			r.noErrExit = oldNoErrExit
			if (r.exit == 0) == (x.Op == syntax.AndStmt) {
				r.stmt(ctx, x.Y)
			}
		case syntax.Pipe, syntax.PipeAll:
			pr, pw, err := os.Pipe()
			if err != nil {
				r.setErr(err)
				return
			}
			r2 := r.Subshell()
			r2.stdout = pw
			if x.Op == syntax.PipeAll {
				r2.stderr = pw
			} else {
				r2.stderr = r.stderr
			}
			r.stdin = pr
			var wg sync.WaitGroup
			wg.Add(1)
			go func() {
				r2.stmt(ctx, x.X)
				pw.Close()
				wg.Done()
			}()
			r.stmt(ctx, x.Y)
			pr.Close()
			wg.Wait()
			if r.opts[optPipeFail] && r2.exit != 0 && r.exit == 0 {
				r.exit = r2.exit
			}
			r.setErr(r2.err)
		}
	case *syntax.IfClause:
		oldNoErrExit := r.noErrExit
		r.noErrExit = true
		r.stmts(ctx, x.Cond)
		r.noErrExit = oldNoErrExit

if r.exit == 0 {
			r.stmts(ctx, x.Then)
			break
		}
		r.exit = 0
		if x.Else != nil {
			r.cmd(ctx, x.Else)
		}
	case *syntax.WhileClause:
		for !r.stop(ctx) {
			oldNoErrExit := r.noErrExit
			r.noErrExit = true
			r.stmts(ctx, x.Cond)
			r.noErrExit = oldNoErrExit

stop := (r.exit == 0) == x.Until
			r.exit = 0
			if stop || r.loopStmtsBroken(ctx, x.Do) {
				break
			}
		}
	case *syntax.ForClause:
		switch y := x.Loop.(type) {
		case *syntax.WordIter:
			name := y.Name.Value
			items := r.Params // for i; do ...
			if y.InPos.IsValid() {
				items = r.fields(y.Items...) // for i in ...; do ...
			}
			for _, field := range items {
				r.setVarString(name, field)
				if r.loopStmtsBroken(ctx, x.Do) {
					break
				}
			}
		case *syntax.CStyleLoop:
			if y.Init != nil {
				r.arithm(y.Init)
			}
			for y.Cond == nil || r.arithm(y.Cond) != 0 {
				if r.exit != 0 || r.loopStmtsBroken(ctx, x.Do) {
					break
				}
				if y.Post != nil {
					r.arithm(y.Post)
				}
			}
		}
	case *syntax.FuncDecl:
		r.setFunc(x.Name.Value, x.Body)
	case *syntax.ArithmCmd:
		r.exit = oneIf(r.arithm(x.X) == 0)
	case *syntax.LetClause:
		var val int
		for _, expr := range x.Exprs {
			val = r.arithm(expr)
		}
		r.exit = oneIf(val == 0)
	case *syntax.CaseClause:
		str := r.literal(x.Word)
		for _, ci := range x.Items {
			for _, word := range ci.Patterns {
				pattern := r.pattern(word)
				if match(pattern, str) {
					r.stmts(ctx, ci.Stmts)
					return
				}
			}
		}
	case *syntax.TestClause:
		if r.bashTest(ctx, x.X, false) == "" && r.exit == 0 {
			// to preserve exit status code 2 for regex errors, etc
			r.exit = 1
		}
	case *syntax.DeclClause:
		local, global := false, false
		var modes []string
		valType := ""
		switch x.Variant.Value {
		case "declare":
			// When used in a function, "declare" acts as "local"
			// unless the "-g" option is used.
			local = r.inFunc
		case "local":
			if !r.inFunc {
				r.errf("local: can only be used in a function\n")
				r.exit = 1
				return
			}
			local = true
		case "export":
			modes = append(modes, "-x")
		case "readonly":
			modes = append(modes, "-r")
		case "nameref":
			valType = "-n"
		}
		for _, as := range x.Args {
			for _, as := range r.flattenAssign(as) {
				name := as.Name.Value
				if strings.HasPrefix(name, "-") {
					switch name {
					case "-x", "-r":
						modes = append(modes, name)
					case "-a", "-A", "-n":
						valType = name
					case "-g":
						global = true
					default:
						r.errf("declare: invalid option %q\n", name)
						r.exit = 2
						return
					}
					continue
				}
				if !syntax.ValidName(name) {
					r.errf("declare: invalid name %q\n", name)
					r.exit = 1
					return
				}
				vr := r.assignVal(as, valType)
				if global {
					vr.Local = false
				} else if local {
					vr.Local = true
				}
				for _, mode := range modes {
					switch mode {
					case "-x":
						vr.Exported = true
					case "-r":
						vr.ReadOnly = true
					}
				}
				if as.Naked {
					r.setVarInternal(name, vr)
				} else {
					r.setVar(name, as.Index, vr)
				}
			}
		}
	case *syntax.TimeClause:
		start := time.Now()
		if x.Stmt != nil {
			r.stmt(ctx, x.Stmt)
		}
		format := "%s\t%s\n"
		if x.PosixFormat {
			format = "%s %s\n"
		} else {
			r.outf("\n")
		}
		real := time.Since(start)
		r.outf(format, "real", elapsedString(real, x.PosixFormat))
		// TODO: can we do these?
		r.outf(format, "user", elapsedString(0, x.PosixFormat))
		r.outf(format, "sys", elapsedString(0, x.PosixFormat))
	default:
		panic(fmt.Sprintf("unhandled command node: %T", x))
	}
}

func (r *Runner) flattenAssign(as *syntax.Assign) []*syntax.Assign {
	// Convert "declare $x" into "declare value".
	// Don't use syntax.Parser here, as we only want the basic
	// splitting by '='.
	if as.Name != nil {
		return []*syntax.Assign{as} // nothing to do
	}
	var asgns []*syntax.Assign
	for _, field := range r.fields(as.Value) {
		as := &syntax.Assign{}
		parts := strings.SplitN(field, "=", 2)
		as.Name = &syntax.Lit{Value: parts[0]}
		if len(parts) == 1 {
			as.Naked = true
		} else {
			as.Value = &syntax.Word{Parts: []syntax.WordPart{
				&syntax.Lit{Value: parts[1]},
			}}
		}
		asgns = append(asgns, as)
	}
	return asgns
}

func match(pat, name string) bool {
	expr, err := pattern.Regexp(pat, 0)
	if err != nil {
		return false
	}
	rx := regexp.MustCompile("^" + expr + "$")
	return rx.MatchString(name)
}

func elapsedString(d time.Duration, posix bool) string {
	if posix {
		return fmt.Sprintf("%.2f", d.Seconds())
	}
	min := int(d.Minutes())
	sec := math.Remainder(d.Seconds(), 60.0)
	return fmt.Sprintf("%dm%.3fs", min, sec)
}

func (r *Runner) stmts(ctx context.Context, stmts []*syntax.Stmt) {
	for _, stmt := range stmts {
		r.stmt(ctx, stmt)
	}
}

func (r *Runner) hdocReader(rd *syntax.Redirect) io.Reader {
	if rd.Op != syntax.DashHdoc {
		hdoc := r.document(rd.Hdoc)
		return strings.NewReader(hdoc)
	}
	var buf bytes.Buffer
	var cur []syntax.WordPart
	flushLine := func() {
		if buf.Len() > 0 {
			buf.WriteByte('\n')
		}
		buf.WriteString(r.document(&syntax.Word{Parts: cur}))
		cur = cur[:0]
	}
	for _, wp := range rd.Hdoc.Parts {
		lit, ok := wp.(*syntax.Lit)
		if !ok {
			cur = append(cur, wp)
			continue
		}
		for i, part := range strings.Split(lit.Value, "\n") {
			if i > 0 {
				flushLine()
				cur = cur[:0]
			}
			part = strings.TrimLeft(part, "\t")
			cur = append(cur, &syntax.Lit{Value: part})
		}
	}
	flushLine()
	return &buf
}

func (r *Runner) redir(ctx context.Context, rd *syntax.Redirect) (io.Closer, error) {
	if rd.Hdoc != nil {
		r.stdin = r.hdocReader(rd)
		return nil, nil
	}
	orig := &r.stdout
	if rd.N != nil {
		switch rd.N.Value {
		case "1":
		case "2":
			orig = &r.stderr
		}
	}
	arg := r.literal(rd.Word)
	switch rd.Op {
	case syntax.WordHdoc:
		r.stdin = strings.NewReader(arg + "\n")
		return nil, nil
	case syntax.DplOut:
		switch arg {
		case "1":
			*orig = r.stdout
		case "2":
			*orig = r.stderr
		}
		return nil, nil
	case syntax.RdrIn, syntax.RdrOut, syntax.AppOut,
		syntax.RdrAll, syntax.AppAll:
		// done further below
	// case syntax.DplIn:
	default:
		panic(fmt.Sprintf("unhandled redirect op: %v", rd.Op))
	}
	mode := os.O_RDONLY
	switch rd.Op {
	case syntax.AppOut, syntax.AppAll:
		mode = os.O_WRONLY | os.O_CREATE | os.O_APPEND
	case syntax.RdrOut, syntax.RdrAll:
		mode = os.O_WRONLY | os.O_CREATE | os.O_TRUNC
	}
	f, err := r.open(ctx, arg, mode, 0o644, true)
	if err != nil {
		return nil, err
	}
	switch rd.Op {
	case syntax.RdrIn:
		r.stdin = f
	case syntax.RdrOut, syntax.AppOut:
		*orig = f
	case syntax.RdrAll, syntax.AppAll:
		r.stdout = f
		r.stderr = f
	default:
		panic(fmt.Sprintf("unhandled redirect op: %v", rd.Op))
	}
	return f, nil
}

func (r *Runner) loopStmtsBroken(ctx context.Context, stmts []*syntax.Stmt) bool {
	oldInLoop := r.inLoop
	r.inLoop = true
	defer func() { r.inLoop = oldInLoop }()
	for _, stmt := range stmts {
		r.stmt(ctx, stmt)
		if r.contnEnclosing > 0 {
			r.contnEnclosing--
			return r.contnEnclosing > 0
		}
		if r.breakEnclosing > 0 {
			r.breakEnclosing--
			return true
		}
	}
	return false
}

type returnStatus uint8

func (s returnStatus) Error() string { return fmt.Sprintf("return status %d", s) }

func (r *Runner) call(ctx context.Context, pos syntax.Pos, args []string) {
	if r.stop(ctx) {
		return
	}
	name := args[0]
	if body := r.Funcs[name]; body != nil {
		// stack them to support nested func calls
		oldParams := r.Params
		r.Params = args[1:]
		oldInFunc := r.inFunc
		oldFuncVars := r.funcVars
		r.funcVars = nil
		r.inFunc = true

r.stmt(ctx, body)

r.Params = oldParams
		r.funcVars = oldFuncVars
		r.inFunc = oldInFunc
		if code, ok := r.err.(returnStatus); ok {
			r.err = nil
			r.exit = int(code)
		}
		return
	}
	if isBuiltin(name) {
		r.exit = r.builtinCode(ctx, pos, name, args[1:])
		return
	}
	r.exec(ctx, args)
}

func (r *Runner) exec(ctx context.Context, args []string) {
	err := r.execHandler(r.handlerCtx(ctx), args)
	if status, ok := IsExitStatus(err); ok {
		r.exit = int(status)
		return
	}
	if err != nil {
		// handler's custom fatal error
		r.setErr(err)
		return
	}
	r.exit = 0
}

func (r *Runner) open(ctx context.Context, path string, flags int, mode os.FileMode, print bool) (io.ReadWriteCloser, error) {
	f, err := r.openHandler(r.handlerCtx(ctx), path, flags, mode)
	// TODO: support wrapped PathError returned from openHandler.
	switch err.(type) {
	case nil:
	case *os.PathError:
		if print {
			r.errf("%v\n", err)
		}
	default: // handler's custom fatal error
		r.setErr(err)
	}
	return f, err
}

func (r *Runner) stat(name string) (os.FileInfo, error) {
	return os.Stat(r.absPath(name))
}
07070100000045000081A4000003E800000064000000016046124D00001383000000000000000000000000000000000000001800000000sh-3.2.4/interp/test.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"regexp"

"golang.org/x/term"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

// non-empty string is true, empty string is false
func (r *Runner) bashTest(ctx context.Context, expr syntax.TestExpr, classic bool) string {
	switch x := expr.(type) {
	case *syntax.Word:
		if classic {
			// In the classic "test" mode, we already expanded and
			// split the list of words, so don't redo that work.
			return r.document(x)
		}
		return r.literal(x)
	case *syntax.ParenTest:
		return r.bashTest(ctx, x.X, classic)
	case *syntax.BinaryTest:
		switch x.Op {
		case syntax.TsMatchShort, syntax.TsMatch, syntax.TsNoMatch:
			str := r.literal(x.X.(*syntax.Word))
			yw := x.Y.(*syntax.Word)
			if classic { // test, [
				lit := r.literal(yw)
				if (str == lit) == (x.Op != syntax.TsNoMatch) {
					return "1"
				}
			} else { // [[
				pattern := r.pattern(yw)
				if match(pattern, str) == (x.Op != syntax.TsNoMatch) {
					return "1"
				}
			}
			return ""
		}
		if r.binTest(x.Op, r.bashTest(ctx, x.X, classic), r.bashTest(ctx, x.Y, classic)) {
			return "1"
		}
		return ""
	case *syntax.UnaryTest:
		if r.unTest(ctx, x.Op, r.bashTest(ctx, x.X, classic)) {
			return "1"
		}
		return ""
	}
	return ""
}

func (r *Runner) binTest(op syntax.BinTestOperator, x, y string) bool {
	switch op {
	case syntax.TsReMatch:
		re, err := regexp.Compile(y)
		if err != nil {
			r.exit = 2
			return false
		}
		return re.MatchString(x)
	case syntax.TsNewer:
		info1, err1 := r.stat(x)
		info2, err2 := r.stat(y)
		if err1 != nil || err2 != nil {
			return false
		}
		return info1.ModTime().After(info2.ModTime())
	case syntax.TsOlder:
		info1, err1 := r.stat(x)
		info2, err2 := r.stat(y)
		if err1 != nil || err2 != nil {
			return false
		}
		return info1.ModTime().Before(info2.ModTime())
	case syntax.TsDevIno:
		info1, err1 := r.stat(x)
		info2, err2 := r.stat(y)
		if err1 != nil || err2 != nil {
			return false
		}
		return os.SameFile(info1, info2)
	case syntax.TsEql:
		return atoi(x) == atoi(y)
	case syntax.TsNeq:
		return atoi(x) != atoi(y)
	case syntax.TsLeq:
		return atoi(x) <= atoi(y)
	case syntax.TsGeq:
		return atoi(x) >= atoi(y)
	case syntax.TsLss:
		return atoi(x) < atoi(y)
	case syntax.TsGtr:
		return atoi(x) > atoi(y)
	case syntax.AndTest:
		return x != "" && y != ""
	case syntax.OrTest:
		return x != "" || y != ""
	case syntax.TsBefore:
		return x < y
	default: // syntax.TsAfter
		return x > y
	}
}

func (r *Runner) statMode(name string, mode os.FileMode) bool {
	info, err := r.stat(name)
	return err == nil && info.Mode()&mode != 0
}

func (r *Runner) unTest(ctx context.Context, op syntax.UnTestOperator, x string) bool {
	switch op {
	case syntax.TsExists:
		_, err := r.stat(x)
		return err == nil
	case syntax.TsRegFile:
		info, err := r.stat(x)
		return err == nil && info.Mode().IsRegular()
	case syntax.TsDirect:
		return r.statMode(x, os.ModeDir)
	case syntax.TsCharSp:
		return r.statMode(x, os.ModeCharDevice)
	case syntax.TsBlckSp:
		info, err := r.stat(x)
		return err == nil && info.Mode()&os.ModeDevice != 0 &&
			info.Mode()&os.ModeCharDevice == 0
	case syntax.TsNmPipe:
		return r.statMode(x, os.ModeNamedPipe)
	case syntax.TsSocket:
		return r.statMode(x, os.ModeSocket)
	case syntax.TsSmbLink:
		info, err := os.Lstat(r.absPath(x))
		return err == nil && info.Mode()&os.ModeSymlink != 0
	case syntax.TsSticky:
		return r.statMode(x, os.ModeSticky)
	case syntax.TsUIDSet:
		return r.statMode(x, os.ModeSetuid)
	case syntax.TsGIDSet:
		return r.statMode(x, os.ModeSetgid)
	// case syntax.TsGrpOwn:
	// case syntax.TsUsrOwn:
	// case syntax.TsModif:
	case syntax.TsRead:
		f, err := r.open(ctx, x, os.O_RDONLY, 0, false)
		if err == nil {
			f.Close()
		}
		return err == nil
	case syntax.TsWrite:
		f, err := r.open(ctx, x, os.O_WRONLY, 0, false)
		if err == nil {
			f.Close()
		}
		return err == nil
	case syntax.TsExec:
		_, err := exec.LookPath(r.absPath(x))
		return err == nil
	case syntax.TsNoEmpty:
		info, err := r.stat(x)
		return err == nil && info.Size() > 0
	case syntax.TsFdTerm:
		fd := atoi(x)
		var f interface{}
		switch fd {
		case 0:
			f = r.stdin
		case 1:
			f = r.stdout
		case 2:
			f = r.stderr
		}
		if f, ok := f.(interface{ Fd() uintptr }); ok {
			// Support Fd methods such as the one on *os.File.
			return term.IsTerminal(int(f.Fd()))
		}
		// TODO: allow term.IsTerminal here too if running in the
		// "single process" mode.
		return false
	case syntax.TsEmpStr:
		return x == ""
	case syntax.TsNempStr:
		return x != ""
	case syntax.TsOptSet:
		if opt := r.optByName(x, false); opt != nil {
			return *opt
		}
		return false
	case syntax.TsVarSet:
		return r.lookupVar(x).IsSet()
	case syntax.TsRefVar:
		return r.lookupVar(x).Kind == expand.NameRef
	case syntax.TsNot:
		return x == ""
	default:
		panic(fmt.Sprintf("unhandled unary test op: %v", op))
	}
}
07070100000046000081A4000003E800000064000000016046124D00000E69000000000000000000000000000000000000002000000000sh-3.2.4/interp/test_classic.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"fmt"

"mvdan.cc/sh/v3/syntax"
)

const illegalTok = 0

type testParser struct {
	eof bool
	val string
	rem []string

err func(err error)
}

func (p *testParser) errf(format string, a ...interface{}) {
	p.err(fmt.Errorf(format, a...))
}

func (p *testParser) next() {
	if p.eof || len(p.rem) == 0 {
		p.eof = true
		p.val = ""
		return
	}
	p.val = p.rem[0]
	p.rem = p.rem[1:]
}

func (p *testParser) followWord(fval string) *syntax.Word {
	if p.eof {
		p.errf("%s must be followed by a word", fval)
	}
	w := &syntax.Word{Parts: []syntax.WordPart{
		&syntax.Lit{Value: p.val},
	}}
	p.next()
	return w
}

func (p *testParser) classicTest(fval string, pastAndOr bool) syntax.TestExpr {
	var left syntax.TestExpr
	if pastAndOr {
		left = p.testExprBase(fval)
	} else {
		left = p.classicTest(fval, true)
	}
	if left == nil || p.eof {
		return left
	}
	opStr := p.val
	op := testBinaryOp(p.val)
	if op == illegalTok {
		p.errf("not a valid test operator: %s", p.val)
	}
	b := &syntax.BinaryTest{
		Op: op,
		X:  left,
	}
	p.next()
	switch b.Op {
	case syntax.AndTest, syntax.OrTest:
		if b.Y = p.classicTest(opStr, false); b.Y == nil {
			p.errf("%s must be followed by an expression", opStr)
		}
	default:
		b.Y = p.followWord(opStr)
	}
	return b
}

func (p *testParser) testExprBase(fval string) syntax.TestExpr {
	if p.eof {
		return nil
	}
	op := testUnaryOp(p.val)
	switch op {
	case syntax.TsNot:
		u := &syntax.UnaryTest{Op: op}
		p.next()
		u.X = p.classicTest(op.String(), false)
		return u
	case illegalTok:
		return p.followWord(fval)
	default:
		u := &syntax.UnaryTest{Op: op}
		p.next()
		if p.eof {
			// make [ -e ] fall back to [ -n -e ], i.e. use
			// the operator as an argument
			return &syntax.Word{Parts: []syntax.WordPart{
				&syntax.Lit{Value: op.String()},
			}}
		}
		u.X = p.followWord(op.String())
		return u
	}
}

// testUnaryOp is an exact copy of syntax's.
func testUnaryOp(val string) syntax.UnTestOperator {
	switch val {
	case "!":
		return syntax.TsNot
	case "-e", "-a":
		return syntax.TsExists
	case "-f":
		return syntax.TsRegFile
	case "-d":
		return syntax.TsDirect
	case "-c":
		return syntax.TsCharSp
	case "-b":
		return syntax.TsBlckSp
	case "-p":
		return syntax.TsNmPipe
	case "-S":
		return syntax.TsSocket
	case "-L", "-h":
		return syntax.TsSmbLink
	case "-k":
		return syntax.TsSticky
	case "-g":
		return syntax.TsGIDSet
	case "-u":
		return syntax.TsUIDSet
	case "-G":
		return syntax.TsGrpOwn
	case "-O":
		return syntax.TsUsrOwn
	case "-N":
		return syntax.TsModif
	case "-r":
		return syntax.TsRead
	case "-w":
		return syntax.TsWrite
	case "-x":
		return syntax.TsExec
	case "-s":
		return syntax.TsNoEmpty
	case "-t":
		return syntax.TsFdTerm
	case "-z":
		return syntax.TsEmpStr
	case "-n":
		return syntax.TsNempStr
	case "-o":
		return syntax.TsOptSet
	case "-v":
		return syntax.TsVarSet
	case "-R":
		return syntax.TsRefVar
	default:
		return illegalTok
	}
}

// testBinaryOp is like syntax's, but with -a and -o, and without =~.
func testBinaryOp(val string) syntax.BinTestOperator {
	switch val {
	case "-a":
		return syntax.AndTest
	case "-o":
		return syntax.OrTest
	case "==", "=":
		return syntax.TsMatch
	case "!=":
		return syntax.TsNoMatch
	case "-nt":
		return syntax.TsNewer
	case "-ot":
		return syntax.TsOlder
	case "-ef":
		return syntax.TsDevIno
	case "-eq":
		return syntax.TsEql
	case "-ne":
		return syntax.TsNeq
	case "-le":
		return syntax.TsLeq
	case "-ge":
		return syntax.TsGeq
	case "-lt":
		return syntax.TsLss
	case "-gt":
		return syntax.TsGtr
	default:
		return illegalTok
	}
}
07070100000047000081A4000003E800000064000000016046124D00000C3C000000000000000000000000000000000000001D00000000sh-3.2.4/interp/unix_test.go// Copyright (c) 2019, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// +build !windows

package interp

import (
	"bufio"
	"context"
	"io"
	"os"
	"os/exec"
	"strings"
	"testing"

"github.com/creack/pty"
)

func TestRunnerTerminalStdIO(t *testing.T) {
	t.Parallel()

tests := []struct {
		name  string
		files func(*testing.T) (slave io.Writer, master io.Reader)
		want  string
	}{
		{"Nil", func(t *testing.T) (io.Writer, io.Reader) {
			return nil, strings.NewReader("\n")
		}, "\n"},
		{"Pipe", func(t *testing.T) (io.Writer, io.Reader) {
			pr, pw := io.Pipe()
			return pw, pr
		}, "end\n"},
		{"Pseudo", func(t *testing.T) (io.Writer, io.Reader) {
			pty, tty, err := pty.Open()
			if err != nil {
				t.Fatal(err)
			}
			return tty, pty
		}, "012end\r\n"},
	}
	file := parse(t, nil, `
		for n in 0 1 2 3; do if [[ -t $n ]]; then echo -n $n; fi; done; echo end
	`)
	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()

slave, master := test.files(t)
			// some slaves can be used as stdin too, like a tty
			slaveReader, _ := slave.(io.Reader)

r, _ := New(StdIO(slaveReader, slave, slave))
			go func() {
				// To mimic os/exec.Cmd.Start, use a goroutine.
				if err := r.Run(context.Background(), file); err != nil {
					t.Error(err)
				}
			}()

got, err := bufio.NewReader(master).ReadString('\n')
			if err != nil {
				t.Fatal(err)
			}
			if got != test.want {
				t.Fatalf("\nwant: %q\ngot:  %q", test.want, got)
			}
			if closer, ok := slave.(io.Closer); ok {
				closer.Close()
			}
			if closer, ok := master.(io.Closer); ok {
				closer.Close()
			}
		})
	}
}

func TestRunnerTerminalExec(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name  string
		start func(*testing.T, *exec.Cmd) io.Reader
		want  string
	}{
		{"Nil", func(t *testing.T, cmd *exec.Cmd) io.Reader {
			if err := cmd.Start(); err != nil {
				t.Fatal(err)
			}
			return strings.NewReader("\n")
		}, "\n"},
		{"Pipe", func(t *testing.T, cmd *exec.Cmd) io.Reader {
			out, err := cmd.StdoutPipe()
			if err != nil {
				t.Fatal(err)
			}
			cmd.Stderr = cmd.Stdout
			if err := cmd.Start(); err != nil {
				t.Fatal(err)
			}
			return out
		}, "end\n"},
		{"Pseudo", func(t *testing.T, cmd *exec.Cmd) io.Reader {
			pty_, err := pty.Start(cmd)
			if err != nil {
				t.Fatal(err)
			}
			return pty_
		}, "012end\r\n"},
	}
	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			if test.name == "Pseudo" {
				t.Skipf("too flaky on GitHub's machines; see https://github.com/mvdan/sh/issues/513")
			}
			t.Parallel()

cmd := exec.Command(os.Getenv("GOSH_PROG"),
				"for n in 0 1 2 3; do if [[ -t $n ]]; then echo -n $n; fi; done; echo end")
			out := test.start(t, cmd)

got, err := bufio.NewReader(out).ReadString('\n')
			if err != nil {
				t.Fatal(err)
			}
			if got != test.want {
				t.Fatalf("\nwant: %q\ngot:  %q", test.want, string(got))
			}
			if err := cmd.Wait(); err != nil {
				t.Fatal(err)
			}
		})
	}
}

func shortPathName(path string) (string, error) {
	panic("only works on windows")
}
07070100000048000081A4000003E800000064000000016046124D00001D74000000000000000000000000000000000000001800000000sh-3.2.4/interp/vars.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package interp

import (
	"os"
	"runtime"
	"strconv"
	"strings"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

type overlayEnviron struct {
	parent expand.Environ
	values map[string]expand.Variable
}

func (o overlayEnviron) Get(name string) expand.Variable {
	if vr, ok := o.values[name]; ok {
		return vr
	}
	return o.parent.Get(name)
}

func (o overlayEnviron) Set(name string, vr expand.Variable) {
	o.values[name] = vr
}

func (o overlayEnviron) Each(f func(name string, vr expand.Variable) bool) {
	o.parent.Each(f)
	for name, vr := range o.values {
		if !f(name, vr) {
			return
		}
	}
}

func execEnv(env expand.Environ) []string {
	list := make([]string, 0, 64)
	env.Each(func(name string, vr expand.Variable) bool {
		if !vr.IsSet() {
			// If a variable is set globally but unset in the
			// runner, we need to ensure it's not part of the final
			// list. Seems like zeroing the element is enough.
			// This is a linear search, but this scenario should be
			// rare, and the number of variables shouldn't be large.
			for i, kv := range list {
				if strings.HasPrefix(kv, name+"=") {
					list[i] = ""
				}
			}
		}
		if vr.Exported {
			list = append(list, name+"="+vr.String())
		}
		return true
	})
	return list
}

func (r *Runner) lookupVar(name string) expand.Variable {
	if name == "" {
		panic("variable name must not be empty")
	}
	var vr expand.Variable
	switch name {
	case "#":
		vr.Kind, vr.Str = expand.String, strconv.Itoa(len(r.Params))
	case "@", "*":
		vr.Kind = expand.Indexed
		if r.Params == nil {
			// r.Params may be nil but positional parameters always exist
			vr.List = []string{}
		} else {
			vr.List = r.Params
		}
	case "?":
		vr.Kind, vr.Str = expand.String, strconv.Itoa(r.lastExit)
	case "$":
		vr.Kind, vr.Str = expand.String, strconv.Itoa(os.Getpid())
	case "PPID":
		vr.Kind, vr.Str = expand.String, strconv.Itoa(os.Getppid())
	case "DIRSTACK":
		vr.Kind, vr.List = expand.Indexed, r.dirStack
	case "0":
		vr.Kind = expand.String
		if r.filename != "" {
			vr.Str = r.filename
		} else {
			vr.Str = "gosh"
		}
	case "1", "2", "3", "4", "5", "6", "7", "8", "9":
		vr.Kind = expand.String
		i := int(name[0] - '1')
		if i < len(r.Params) {
			vr.Str = r.Params[i]
		} else {
			vr.Str = ""
		}
	}
	if vr.IsSet() {
		return vr
	}
	if value, e := r.cmdVars[name]; e {
		return expand.Variable{Kind: expand.String, Str: value}
	}
	if vr, e := r.funcVars[name]; e {
		vr.Local = true
		return vr
	}
	if vr, e := r.Vars[name]; e {
		return vr
	}
	if vr := r.Env.Get(name); vr.IsSet() {
		return vr
	}
	if runtime.GOOS == "windows" {
		upper := strings.ToUpper(name)
		if vr := r.Env.Get(upper); vr.IsSet() {
			return vr
		}
	}
	if r.opts[optNoUnset] {
		r.errf("%s: unbound variable\n", name)
		r.exit = 1
		r.exitShell = true
	}
	return expand.Variable{}
}

func (r *Runner) envGet(name string) string {
	return r.lookupVar(name).String()
}

func (r *Runner) delVar(name string) {
	vr := r.lookupVar(name)
	if vr.ReadOnly {
		r.errf("%s: readonly variable\n", name)
		r.exit = 1
		return
	}
	if vr.Local {
		// don't overwrite a non-local var with the same name
		r.funcVars[name] = expand.Variable{}
	} else {
		r.Vars[name] = expand.Variable{} // to not query r.Env
	}
}

func (r *Runner) setVarString(name, value string) {
	r.setVar(name, nil, expand.Variable{Kind: expand.String, Str: value})
}

func (r *Runner) setVarInternal(name string, vr expand.Variable) {
	if vr.Kind == expand.String {
		if r.opts[optAllExport] {
			vr.Exported = true
		}
	} else {
		vr.Exported = false
	}
	if vr.Local {
		if r.funcVars == nil {
			r.funcVars = make(map[string]expand.Variable)
		}
		r.funcVars[name] = vr
	} else {
		r.Vars[name] = vr
	}
}

func (r *Runner) setVar(name string, index syntax.ArithmExpr, vr expand.Variable) {
	cur := r.lookupVar(name)
	if cur.ReadOnly {
		r.errf("%s: readonly variable\n", name)
		r.exit = 1
		return
	}
	if name2, var2 := cur.Resolve(r.Env); name2 != "" {
		name = name2
		cur = var2
	}

if vr.Kind == expand.String && index == nil {
		// When assigning a string to an array, fall back to the
		// zero value for the index.
		switch cur.Kind {
		case expand.Indexed:
			index = &syntax.Word{Parts: []syntax.WordPart{
				&syntax.Lit{Value: "0"},
			}}
		case expand.Associative:
			index = &syntax.Word{Parts: []syntax.WordPart{
				&syntax.DblQuoted{},
			}}
		}
	}
	if index == nil {
		r.setVarInternal(name, vr)
		return
	}

// from the syntax package, we know that value must be a string if index
	// is non-nil; nested arrays are forbidden.
	valStr := vr.Str

var list []string
	switch cur.Kind {
	case expand.String:
		list = append(list, cur.Str)
	case expand.Indexed:
		list = cur.List
	case expand.Associative:
		// if the existing variable is already an AssocArray, try our
		// best to convert the key to a string
		w, ok := index.(*syntax.Word)
		if !ok {
			return
		}
		k := r.literal(w)
		cur.Map[k] = valStr
		r.setVarInternal(name, cur)
		return
	}
	k := r.arithm(index)
	for len(list) < k+1 {
		list = append(list, "")
	}
	list[k] = valStr
	cur.Kind = expand.Indexed
	cur.List = list
	r.setVarInternal(name, cur)
}

func (r *Runner) setFunc(name string, body *syntax.Stmt) {
	if r.Funcs == nil {
		r.Funcs = make(map[string]*syntax.Stmt, 4)
	}
	r.Funcs[name] = body
}

func stringIndex(index syntax.ArithmExpr) bool {
	w, ok := index.(*syntax.Word)
	if !ok || len(w.Parts) != 1 {
		return false
	}
	switch w.Parts[0].(type) {
	case *syntax.DblQuoted, *syntax.SglQuoted:
		return true
	}
	return false
}

func (r *Runner) assignVal(as *syntax.Assign, valType string) expand.Variable {
	prev := r.lookupVar(as.Name.Value)
	if as.Naked {
		return prev
	}
	if as.Value != nil {
		s := r.literal(as.Value)
		if !as.Append || !prev.IsSet() {
			prev.Kind = expand.String
			if valType == "-n" {
				prev.Kind = expand.NameRef
			}
			prev.Str = s
			return prev
		}
		switch prev.Kind {
		case expand.String:
			prev.Str += s
		case expand.Indexed:
			if len(prev.List) == 0 {
				prev.List = append(prev.List, "")
			}
			prev.List[0] += s
		case expand.Associative:
			// TODO
		}
		return prev
	}
	if as.Array == nil {
		// don't return the zero value, as that's an unset variable
		prev.Kind = expand.String
		if valType == "-n" {
			prev.Kind = expand.NameRef
		}
		prev.Str = ""
		return prev
	}
	elems := as.Array.Elems
	if valType == "" {
		valType = "-a" // indexed
		if len(elems) > 0 && stringIndex(elems[0].Index) {
			valType = "-A" // associative
		}
	}
	if valType == "-A" {
		amap := make(map[string]string, len(elems))
		for _, elem := range elems {
			k := r.literal(elem.Index.(*syntax.Word))
			amap[k] = r.literal(elem.Value)
		}
		if !as.Append {
			prev.Kind = expand.Associative
			prev.Map = amap
			return prev
		}
		// TODO
		return prev
	}
	maxIndex := len(elems) - 1
	indexes := make([]int, len(elems))
	for i, elem := range elems {
		if elem.Index == nil {
			indexes[i] = i
			continue
		}
		k := r.arithm(elem.Index)
		indexes[i] = k
		if k > maxIndex {
			maxIndex = k
		}
	}
	strs := make([]string, maxIndex+1)
	for i, elem := range elems {
		strs[indexes[i]] = r.literal(elem.Value)
	}
	if !as.Append {
		prev.Kind = expand.Indexed
		prev.List = strs
		return prev
	}
	switch prev.Kind {
	case expand.String:
		prev.Kind = expand.Indexed
		prev.List = append([]string{prev.Str}, strs...)
	case expand.Indexed:
		prev.List = append(prev.List, strs...)
	case expand.Associative:
		// TODO
	}
	return prev
}
07070100000049000081A4000003E800000064000000016046124D00000285000000000000000000000000000000000000002000000000sh-3.2.4/interp/windows_test.go// Copyright (c) 2019, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// +build windows

package interp

import "golang.org/x/sys/windows"

// shortPathName is used for testing against DOS short names.
//
// Only used for testing, so we assume that a short path always fits in
// 2*len(path) in UTF-16.
func shortPathName(path string) (string, error) {
	src, err := windows.UTF16FromString(path)
	if err != nil {
		return "", err
	}
	dst := make([]uint16, len(src)*2)
	if _, err := windows.GetShortPathName(&src[0], &dst[0], uint32(len(dst))); err != nil {
		return "", err
	}
	return windows.UTF16ToString(dst), nil
}
0707010000004A000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001100000000sh-3.2.4/pattern0707010000004B000081A4000003E800000064000000016046124D0000037D000000000000000000000000000000000000002100000000sh-3.2.4/pattern/example_test.go// Copyright (c) 2019, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package pattern_test

import (
	"fmt"
	"regexp"

"mvdan.cc/sh/v3/pattern"
)

func ExampleRegexp() {
	pat := "foo?bar*"
	fmt.Println(pat)

expr, err := pattern.Regexp(pat, 0)
	if err != nil {
		return
	}
	fmt.Println(expr)

rx := regexp.MustCompile(expr)
	fmt.Println(rx.MatchString("foo bar baz"))
	fmt.Println(rx.MatchString("foobarbaz"))
	// Output:
	// foo?bar*
	// foo.bar.*
	// true
	// false
}

func ExampleQuoteMeta() {
	pat := "foo?bar*"
	const mode = 0
	fmt.Println(pat)

quoted := pattern.QuoteMeta(pat, mode)
	fmt.Println(quoted)

expr, err := pattern.Regexp(quoted, mode)
	if err != nil {
		return
	}

rx := regexp.MustCompile(expr)
	fmt.Println(rx.MatchString("foo bar baz"))
	fmt.Println(rx.MatchString("foo?bar*"))
	// Output:
	// foo?bar*
	// foo\?bar\*
	// false
	// true
}
0707010000004C000081A4000003E800000064000000016046124D00001DA0000000000000000000000000000000000000001C00000000sh-3.2.4/pattern/pattern.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package pattern allows working with shell pattern matching notation, also
// known as wildcards or globbing.
//
// For reference, see
// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13.
package pattern

import (
	"bytes"
	"fmt"
	"regexp"
	"strconv"
	"strings"
)

// Mode can be used to supply a number of options to the package's functions.
// Not all functions change their behavior with all of the options below.
type Mode uint

const (
	Shortest  Mode = 1 << iota // prefer the shortest match.
	Filenames                  // "*" and "?" don't match slashes; only "**" does
	Braces                     // support "{a,b}" and "{1..4}"
)

var numRange = regexp.MustCompile(`^([+-]?\d+)\.\.([+-]?\d+)}`)

// Regexp turns a shell pattern into a regular expression that can be used with
// regexp.Compile. It will return an error if the input pattern was incorrect.
// Otherwise, the returned expression can be passed to regexp.MustCompile.
//
// For example, Regexp(`foo*bar?`, true) returns `foo.*bar.`.
//
// Note that this function (and QuoteMeta) should not be directly used with file
// paths if Windows is supported, as the path separator on that platform is the
// same character as the escaping character for shell patterns.
func Regexp(pat string, mode Mode) (string, error) {
	any := false
noopLoop:
	for _, r := range pat {
		switch r {
		// including those that need escaping since they are
		// regular expression metacharacters
		case '*', '?', '[', '\\', '.', '+', '(', ')', '|',
			']', '{', '}', '^', '$':
			any = true
			break noopLoop
		}
	}
	if !any { // short-cut without a string copy
		return pat, nil
	}
	closingBraces := []int{}
	var buf bytes.Buffer
writeLoop:
	for i := 0; i < len(pat); i++ {
		switch c := pat[i]; c {
		case '*':
			if mode&Filenames != 0 {
				if i++; i < len(pat) && pat[i] == '*' {
					if i++; i < len(pat) && pat[i] == '/' {
						buf.WriteString("(.*/|)")
					} else {
						buf.WriteString(".*")
						i--
					}
				} else {
					buf.WriteString("[^/]*")
					i--
				}
			} else {
				buf.WriteString(".*")
			}
			if mode&Shortest != 0 {
				buf.WriteByte('?')
			}
		case '?':
			if mode&Filenames != 0 {
				buf.WriteString("[^/]")
			} else {
				buf.WriteByte('.')
			}
		case '\\':
			if i++; i >= len(pat) {
				return "", fmt.Errorf(`\ at end of pattern`)
			}
			buf.WriteString(regexp.QuoteMeta(string(pat[i])))
		case '[':
			name, err := charClass(pat[i:])
			if err != nil {
				return "", err
			}
			if name != "" {
				buf.WriteString(name)
				i += len(name) - 1
				break
			}
			if mode&Filenames != 0 {
				for _, c := range pat[i:] {
					if c == ']' {
						break
					} else if c == '/' {
						buf.WriteString("\\[")
						continue writeLoop
					}
				}
			}
			buf.WriteByte(c)
			if i++; i >= len(pat) {
				return "", fmt.Errorf("[ was not matched with a closing ]")
			}
			switch c = pat[i]; c {
			case '!', '^':
				buf.WriteByte('^')
				if i++; i >= len(pat) {
					return "", fmt.Errorf("[ was not matched with a closing ]")
				}
			}
			if c = pat[i]; c == ']' {
				buf.WriteByte(']')
				if i++; i >= len(pat) {
					return "", fmt.Errorf("[ was not matched with a closing ]")
				}
			}
			rangeStart := byte(0)
		loopBracket:
			for ; i < len(pat); i++ {
				c = pat[i]
				buf.WriteByte(c)
				switch c {
				case '\\':
					if i++; i < len(pat) {
						buf.WriteByte(pat[i])
					}
					continue
				case ']':
					break loopBracket
				}
				if rangeStart != 0 && rangeStart > c {
					return "", fmt.Errorf("invalid range: %c-%c", rangeStart, c)
				}
				if c == '-' {
					rangeStart = pat[i-1]
				} else {
					rangeStart = 0
				}
			}
			if i >= len(pat) {
				return "", fmt.Errorf("[ was not matched with a closing ]")
			}
		case '{':
			if mode&Braces == 0 {
				buf.WriteString(regexp.QuoteMeta(string(c)))
				break
			}
			innerLevel := 1
			commas := false
		peekBrace:
			for j := i + 1; j < len(pat); j++ {
				switch c := pat[j]; c {
				case '{':
					innerLevel++
				case ',':
					commas = true
				case '\\':
					j++
				case '}':
					if innerLevel--; innerLevel > 0 {
						continue
					}
					if !commas {
						break peekBrace
					}
					closingBraces = append(closingBraces, j)
					buf.WriteString("(?:")
					continue writeLoop
				}
			}
			if match := numRange.FindStringSubmatch(pat[i+1:]); len(match) == 3 {
				start, err1 := strconv.Atoi(match[1])
				end, err2 := strconv.Atoi(match[2])
				if err1 != nil || err2 != nil || start > end {
					return "", fmt.Errorf("invalid range: %q", match[0])
				}
				// TODO: can we do better here?
				buf.WriteString("(?:")
				for n := start; n <= end; n++ {
					if n > start {
						buf.WriteByte('|')
					}
					fmt.Fprintf(&buf, "%d", n)
				}
				buf.WriteByte(')')
				i += len(match[0])
				break
			}
			buf.WriteString(regexp.QuoteMeta(string(c)))
		case ',':
			if len(closingBraces) == 0 {
				buf.WriteString(regexp.QuoteMeta(string(c)))
			} else {
				buf.WriteByte('|')
			}
		case '}':
			if len(closingBraces) > 0 && closingBraces[len(closingBraces)-1] == i {
				buf.WriteByte(')')
				closingBraces = closingBraces[:len(closingBraces)-1]
			} else {
				buf.WriteString(regexp.QuoteMeta(string(c)))
			}
		default:
			if c > 128 {
				buf.WriteByte(c)
			} else {
				buf.WriteString(regexp.QuoteMeta(string(c)))
			}
		}
	}
	return buf.String(), nil
}

func charClass(s string) (string, error) {
	if strings.HasPrefix(s, "[[.") || strings.HasPrefix(s, "[[=") {
		return "", fmt.Errorf("collating features not available")
	}
	if !strings.HasPrefix(s, "[[:") {
		return "", nil
	}
	name := s[3:]
	end := strings.Index(name, ":]]")
	if end < 0 {
		return "", fmt.Errorf("[[: was not matched with a closing :]]")
	}
	name = name[:end]
	switch name {
	case "alnum", "alpha", "ascii", "blank", "cntrl", "digit", "graph",
		"lower", "print", "punct", "space", "upper", "word", "xdigit":
	default:
		return "", fmt.Errorf("invalid character class: %q", name)
	}
	return s[:len(name)+6], nil
}

// HasMeta returns whether a string contains any unescaped pattern
// metacharacters: '*', '?', or '['. When the function returns false, the given
// pattern can only match at most one string.
//
// For example, HasMeta(`foo\*bar`) returns false, but HasMeta(`foo*bar`)
// returns true.
//
// This can be useful to avoid extra work, like TranslatePattern. Note that this
// function cannot be used to avoid QuotePattern, as backslashes are quoted by
// that function but ignored here.
func HasMeta(pat string, mode Mode) bool {
	for i := 0; i < len(pat); i++ {
		switch pat[i] {
		case '\\':
			i++
		case '*', '?', '[':
			return true
		case '{':
			if mode&Braces != 0 {
				return true
			}
		}
	}
	return false
}

// QuoteMeta returns a string that quotes all pattern metacharacters in the
// given text. The returned string is a pattern that matches the literal text.
//
// For example, QuoteMeta(`foo*bar?`) returns `foo\*bar\?`.
func QuoteMeta(pat string, mode Mode) string {
	any := false
loop:
	for _, r := range pat {
		switch r {
		case '{':
			if mode&Braces == 0 {
				continue
			}
			fallthrough
		case '*', '?', '[', '\\':
			any = true
			break loop
		}
	}
	if !any { // short-cut without a string copy
		return pat
	}
	var buf bytes.Buffer
	for _, r := range pat {
		switch r {
		case '*', '?', '[', '\\':
			buf.WriteByte('\\')
		case '{':
			if mode&Braces != 0 {
				buf.WriteByte('\\')
			}
		}
		buf.WriteRune(r)
	}
	return buf.String()
}
0707010000004D000081A4000003E800000064000000016046124D00000FE8000000000000000000000000000000000000002100000000sh-3.2.4/pattern/pattern_test.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package pattern

import (
	"fmt"
	"regexp/syntax"
	"testing"
)

var translateTests = []struct {
	pat     string
	mode    Mode
	want    string
	wantErr bool
}{
	{pat: ``, want: ``},
	{pat: `foo`, want: `foo`},
	{pat: `foóà中`, mode: Filenames | Braces, want: `foóà中`},
	{pat: `.`, want: `\.`},
	{pat: `foo*`, want: `foo.*`},
	{pat: `foo*`, mode: Shortest, want: `foo.*?`},
	{pat: `foo*`, mode: Shortest | Filenames, want: `foo[^/]*?`},
	{pat: `*foo`, mode: Filenames, want: `[^/]*foo`},
	{pat: `**`, want: `.*.*`},
	{pat: `**`, mode: Filenames, want: `.*`},
	{pat: `/**/foo`, want: `/.*.*/foo`},
	{pat: `/**/foo`, mode: Filenames, want: `/(.*/|)foo`},
	{pat: `/**/à`, mode: Filenames, want: `/(.*/|)à`},
	{pat: `/**foo`, mode: Filenames, want: `/.*foo`},
	{pat: `\*`, want: `\*`},
	{pat: `\`, wantErr: true},
	{pat: `?`, want: `.`},
	{pat: `?`, mode: Filenames, want: `[^/]`},
	{pat: `?à`, want: `.à`},
	{pat: `\a`, want: `a`},
	{pat: `(`, want: `\(`},
	{pat: `a|b`, want: `a\|b`},
	{pat: `x{3}`, want: `x\{3\}`},
	{pat: `{3,4}`, want: `\{3,4\}`},
	{pat: `{3,4}`, mode: Braces, want: `(?:3|4)`},
	{pat: `{3,`, want: `\{3,`},
	{pat: `{3,`, mode: Braces, want: `\{3,`},
	{pat: `{3,{4}`, mode: Braces, want: `\{3,\{4\}`},
	{pat: `{3,{4}}`, mode: Braces, want: `(?:3|\{4\})`},
	{pat: `{3,{4,[56]}}`, mode: Braces, want: `(?:3|(?:4|[56]))`},
	{pat: `{3..5}`, mode: Braces, want: `(?:3|4|5)`},
	{pat: `{9..12}`, mode: Braces, want: `(?:9|10|11|12)`},
	{pat: `[a]`, want: `[a]`},
	{pat: `[abc]`, want: `[abc]`},
	{pat: `[^bc]`, want: `[^bc]`},
	{pat: `[!bc]`, want: `[^bc]`},
	{pat: `[[]`, want: `[[]`},
	{pat: `[\]]`, want: `[\]]`},
	{pat: `[\]]`, mode: Filenames, want: `[\]]`},
	{pat: `[]]`, want: `[]]`},
	{pat: `[!]]`, want: `[^]]`},
	{pat: `[^]]`, want: `[^]]`},
	{pat: `[a/b]`, want: `[a/b]`},
	{pat: `[a/b]`, mode: Filenames, want: `\[a/b\]`},
	{pat: `[`, wantErr: true},
	{pat: `[\`, wantErr: true},
	{pat: `[^`, wantErr: true},
	{pat: `[!`, wantErr: true},
	{pat: `[!bc]`, want: `[^bc]`},
	{pat: `[]`, wantErr: true},
	{pat: `[^]`, wantErr: true},
	{pat: `[!]`, wantErr: true},
	{pat: `[ab`, wantErr: true},
	{pat: `[a-]`, want: `[a-]`},
	{pat: `[z-a]`, wantErr: true},
	{pat: `[a-a]`, want: `[a-a]`},
	{pat: `[aa]`, want: `[aa]`},
	{pat: `[0-4A-Z]`, want: `[0-4A-Z]`},
	{pat: `[-a]`, want: `[-a]`},
	{pat: `[^-a]`, want: `[^-a]`},
	{pat: `[a-]`, want: `[a-]`},
	{pat: `[[:digit:]]`, want: `[[:digit:]]`},
	{pat: `[[:`, wantErr: true},
	{pat: `[[:digit`, wantErr: true},
	{pat: `[[:wrong:]]`, wantErr: true},
	{pat: `[[=x=]]`, wantErr: true},
	{pat: `[[.x.]]`, wantErr: true},
}

func TestRegexp(t *testing.T) {
	t.Parallel()
	for i, tc := range translateTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			got, gotErr := Regexp(tc.pat, tc.mode)
			if tc.wantErr && gotErr == nil {
				t.Fatalf("(%q, %b) did not error", tc.pat, tc.mode)
			}
			if !tc.wantErr && gotErr != nil {
				t.Fatalf("(%q, %b) errored with %q", tc.pat, tc.mode, gotErr)
			}
			if got != tc.want {
				t.Fatalf("(%q, %b) got %q, wanted %q", tc.pat, tc.mode, got, tc.want)
			}
			_, rxErr := syntax.Parse(got, syntax.Perl)
			if gotErr == nil && rxErr != nil {
				t.Fatalf("regexp/syntax.Parse(%q) failed with %q", got, rxErr)
			}
		})
	}
}

var metaTests = []struct {
	pat       string
	mode      Mode
	wantHas   bool
	wantQuote string
}{
	{``, 0, false, ``},
	{`foo`, 0, false, `foo`},
	{`.`, 0, false, `.`},
	{`*`, 0, true, `\*`},
	{`*`, Shortest | Filenames, true, `\*`},
	{`foo?`, 0, true, `foo\?`},
	{`\[`, 0, false, `\\\[`},
	{`{`, 0, false, `{`},
	{`{`, Braces, true, `\{`},
}

func TestMeta(t *testing.T) {
	t.Parallel()
	for _, tc := range metaTests {
		if got := HasMeta(tc.pat, tc.mode); got != tc.wantHas {
			t.Errorf("HasMeta(%q, %b) got %t, wanted %t",
				tc.pat, tc.mode, got, tc.wantHas)
		}
		if got := QuoteMeta(tc.pat, tc.mode); got != tc.wantQuote {
			t.Errorf("QuoteMeta(%q, %b) got %q, wanted %q",
				tc.pat, tc.mode, got, tc.wantQuote)
		}
	}
}
0707010000004E000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000000F00000000sh-3.2.4/shell0707010000004F000081A4000003E800000064000000016046124D00000265000000000000000000000000000000000000001600000000sh-3.2.4/shell/doc.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package shell contains high-level features that use the syntax, expand, and
// interp packages under the hood.
//
// Please note that this package uses POSIX Shell syntax. As such, path names on
// Windows need to use double backslashes or be within single quotes when given
// to functions like Fields. For example:
//
//     shell.Fields("echo /foo/bar")     // on Unix-like
//     shell.Fields("echo C:\\foo\\bar") // on Windows
//     shell.Fields("echo 'C:\foo\bar'") // on Windows, with quotes
package shell
07070100000050000081A4000003E800000064000000016046124D00000477000000000000000000000000000000000000001F00000000sh-3.2.4/shell/example_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package shell_test

import (
	"fmt"

"mvdan.cc/sh/v3/shell"
)

func ExampleExpand() {
	env := func(name string) string {
		switch name {
		case "HOME":
			return "/home/user"
		}
		return "" // leave the rest unset
	}
	out, _ := shell.Expand("No place like $HOME", env)
	fmt.Println(out)

out, _ = shell.Expand("Some vars are ${missing:-awesome}", env)
	fmt.Println(out)

out, _ = shell.Expand("Math is fun! $((12 * 34))", nil)
	fmt.Println(out)
	// Output:
	// No place like /home/user
	// Some vars are awesome
	// Math is fun! 408
}

func ExampleFields() {
	env := func(name string) string {
		switch name {
		case "foo":
			return "bar baz"
		}
		return "" // leave the rest unset
	}
	out, _ := shell.Fields(`"many quoted" ' strings '`, env)
	fmt.Printf("%#v\n", out)

out, _ = shell.Fields("unquoted $foo", env)
	fmt.Printf("%#v\n", out)

out, _ = shell.Fields(`quoted "$foo"`, env)
	fmt.Printf("%#v\n", out)
	// Output:
	// []string{"many quoted", " strings "}
	// []string{"unquoted", "bar", "baz"}
	// []string{"quoted", "bar baz"}
}
07070100000051000081A4000003E800000064000000016046124D000007A9000000000000000000000000000000000000001900000000sh-3.2.4/shell/expand.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package shell

import (
	"os"
	"strings"

"mvdan.cc/sh/v3/expand"
	"mvdan.cc/sh/v3/syntax"
)

// Expand performs shell expansion on s as if it were within double quotes,
// using env to resolve variables. This includes parameter expansion, arithmetic
// expansion, and quote removal.
//
// If env is nil, the current environment variables are used. Empty variables
// are treated as unset; to support variables which are set but empty, use the
// expand package directly.
//
// Command subsitutions like $(echo foo) aren't supported to avoid running
// arbitrary code. To support those, use an interpreter with the expand package.
//
// An error will be reported if the input string had invalid syntax.
func Expand(s string, env func(string) string) (string, error) {
	p := syntax.NewParser()
	word, err := p.Document(strings.NewReader(s))
	if err != nil {
		return "", err
	}
	if env == nil {
		env = os.Getenv
	}
	cfg := &expand.Config{Env: expand.FuncEnviron(env)}
	return expand.Document(cfg, word)
}

// Fields performs shell expansion on s as if it were a command's arguments,
// using env to resolve variables. It is similar to Expand, but includes brace
// expansion, tilde expansion, and globbing.
//
// If env is nil, the current environment variables are used. Empty variables
// are treated as unset; to support variables which are set but empty, use the
// expand package directly.
//
// An error will be reported if the input string had invalid syntax.
func Fields(s string, env func(string) string) ([]string, error) {
	p := syntax.NewParser()
	var words []*syntax.Word
	err := p.Words(strings.NewReader(s), func(w *syntax.Word) bool {
		words = append(words, w)
		return true
	})
	if err != nil {
		return nil, err
	}
	if env == nil {
		env = os.Getenv
	}
	cfg := &expand.Config{Env: expand.FuncEnviron(env)}
	return expand.Fields(cfg, words...)
}
07070100000052000081A4000003E800000064000000016046124D00000B13000000000000000000000000000000000000001E00000000sh-3.2.4/shell/expand_test.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package shell

import (
	"fmt"
	"os"
	"reflect"
	"runtime"
	"strings"
	"testing"
)

func strEnviron(pairs ...string) func(string) string {
	return func(name string) string {
		prefix := name + "="
		for _, pair := range pairs {
			if val := strings.TrimPrefix(pair, prefix); val != pair {
				return val
			}
		}
		return ""
	}
}

var expandTests = []struct {
	in   string
	env  func(name string) string
	want string
}{
	{"foo", nil, "foo"},
	{"\nfoo\n", nil, "\nfoo\n"},
	{"a-$b-c", nil, "a--c"},
	{"${INTERP_GLOBAL:+hasOsEnv}", nil, "hasOsEnv"},
	{"a-$b-c", strEnviron(), "a--c"},
	{"a-$b-c", strEnviron("b=b_val"), "a-b_val-c"},
	{"${x//o/a}", strEnviron("x=foo"), "faa"},
	{"*.go", nil, "*.go"},
	{"~", nil, "~"},
}

func TestExpand(t *testing.T) {
	os.Setenv("INTERP_GLOBAL", "value")
	for i := range expandTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			tc := expandTests[i]
			t.Parallel()
			got, err := Expand(tc.in, tc.env)
			if err != nil {
				t.Fatal(err)
			}
			if got != tc.want {
				t.Fatalf("\nwant: %q\ngot:  %q", tc.want, got)
			}
		})
	}
}

func TestUnexpectedCmdSubst(t *testing.T) {
	t.Parallel()
	want := "unexpected command substitution at 1:6"
	for _, fn := range []func() error{
		func() error {
			_, err := Expand("echo $(uname -a)", nil)
			return err
		},
		func() error {
			_, err := Fields("echo $(uname -a)", nil)
			return err
		},
	} {
		got := fmt.Sprint(fn())
		if !strings.Contains(got, want) {
			t.Fatalf("wanted error %q, got: %s", want, got)
		}
	}
}

var fieldsTests = []struct {
	in   string
	env  func(name string) string
	want []string
}{
	{"foo", nil, []string{"foo"}},
	{"\nfoo\n", nil, []string{"foo"}},
	{"foo bar", nil, []string{"foo", "bar"}},
	{"foo 'bar baz'", nil, []string{"foo", "bar baz"}},
	{"$x", strEnviron("x=foo bar"), []string{"foo", "bar"}},
	{`"$x"`, strEnviron("x=foo bar"), []string{"foo bar"}},
	{"~", strEnviron("HOME=/my/home"), []string{"/my/home"}},
	{"~/foo/bar", strEnviron("HOME=/my/home"), []string{"/my/home/foo/bar"}},
	{"~foo/file", strEnviron("HOME foo=/bar"), []string{"/bar/file"}},
	{"*.go", nil, []string{"*.go"}},

{"~", func(name string) string {
		switch runtime.GOOS {
		case "windows":
			if name == "USERPROFILE" {
				return "/my/home"
			}
		default:
			if name == "HOME" {
				return "/my/home"
			}
		}
		return ""
	}, []string{"/my/home"}},
}

func TestFields(t *testing.T) {
	os.Setenv("INTERP_GLOBAL", "value")
	for i := range fieldsTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			tc := fieldsTests[i]
			t.Parallel()
			got, err := Fields(tc.in, tc.env)
			if err != nil {
				t.Fatal(err)
			}
			if !reflect.DeepEqual(got, tc.want) {
				t.Fatalf("\nwant: %q\ngot:  %q", tc.want, got)
			}
		})
	}
}
07070100000053000041ED000003E800000064000000026046124D00000000000000000000000000000000000000000000001000000000sh-3.2.4/syntax07070100000054000081A4000003E800000064000000016046124D00000F0B000000000000000000000000000000000000001A00000000sh-3.2.4/syntax/braces.go// Copyright (c) 2018, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import "strconv"

var (
	litLeftBrace  = &Lit{Value: "{"}
	litComma      = &Lit{Value: ","}
	litDots       = &Lit{Value: ".."}
	litRightBrace = &Lit{Value: "}"}
)

// SplitBraces parses brace expansions within a word's literal parts. If any
// valid brace expansions are found, they are replaced with BraceExp nodes, and
// the function returns true. Otherwise, the word is left untouched and the
// function returns false.
//
// For example, a literal word "foo{bar,baz}" will result in a word containing
// the literal "foo", and a brace expansion with the elements "bar" and "baz".
//
// It does not return an error; malformed brace expansions are simply skipped.
// For example, the literal word "a{b" is left unchanged.
func SplitBraces(word *Word) bool {
	any := false
	top := &Word{}
	acc := top
	var cur *BraceExp
	open := []*BraceExp{}

pop := func() *BraceExp {
		old := cur
		open = open[:len(open)-1]
		if len(open) == 0 {
			cur = nil
			acc = top
		} else {
			cur = open[len(open)-1]
			acc = cur.Elems[len(cur.Elems)-1]
		}
		return old
	}
	addLit := func(lit *Lit) {
		acc.Parts = append(acc.Parts, lit)
	}

for _, wp := range word.Parts {
		lit, ok := wp.(*Lit)
		if !ok {
			acc.Parts = append(acc.Parts, wp)
			continue
		}
		last := 0
		for j := 0; j < len(lit.Value); j++ {
			addlitidx := func() {
				if last == j {
					return // empty lit
				}
				l2 := *lit
				l2.Value = l2.Value[last:j]
				addLit(&l2)
			}
			switch lit.Value[j] {
			case '{':
				addlitidx()
				acc = &Word{}
				cur = &BraceExp{Elems: []*Word{acc}}
				open = append(open, cur)
			case ',':
				if cur == nil {
					continue
				}
				addlitidx()
				acc = &Word{}
				cur.Elems = append(cur.Elems, acc)
			case '.':
				if cur == nil {
					continue
				}
				if j+1 >= len(lit.Value) || lit.Value[j+1] != '.' {
					continue
				}
				addlitidx()
				cur.Sequence = true
				acc = &Word{}
				cur.Elems = append(cur.Elems, acc)
				j++
			case '}':
				if cur == nil {
					continue
				}
				any = true
				addlitidx()
				br := pop()
				if len(br.Elems) == 1 {
					// return {x} to a non-brace
					addLit(litLeftBrace)
					acc.Parts = append(acc.Parts, br.Elems[0].Parts...)
					addLit(litRightBrace)
					break
				}
				if !br.Sequence {
					acc.Parts = append(acc.Parts, br)
					break
				}
				var chars [2]bool
				broken := false
				for i, elem := range br.Elems[:2] {
					val := elem.Lit()
					if _, err := strconv.Atoi(val); err == nil {
					} else if len(val) == 1 &&
						'a' <= val[0] && val[0] <= 'z' {
						chars[i] = true
					} else {
						broken = true
					}
				}
				if len(br.Elems) == 3 {
					// increment must be a number
					val := br.Elems[2].Lit()
					if _, err := strconv.Atoi(val); err != nil {
						broken = true
					}
				}
				// are start and end both chars or
				// non-chars?
				if chars[0] != chars[1] {
					broken = true
				}
				if !broken {
					acc.Parts = append(acc.Parts, br)
					break
				}
				// return broken {x..y[..incr]} to a non-brace
				addLit(litLeftBrace)
				for i, elem := range br.Elems {
					if i > 0 {
						addLit(litDots)
					}
					acc.Parts = append(acc.Parts, elem.Parts...)
				}
				addLit(litRightBrace)
			default:
				continue
			}
			last = j + 1
		}
		if last == 0 {
			addLit(lit)
		} else {
			left := *lit
			left.Value = left.Value[last:]
			addLit(&left)
		}
	}
	if !any {
		return false
	}
	// open braces that were never closed fall back to non-braces
	for acc != top {
		br := pop()
		addLit(litLeftBrace)
		for i, elem := range br.Elems {
			if i > 0 {
				if br.Sequence {
					addLit(litDots)
				} else {
					addLit(litComma)
				}
			}
			acc.Parts = append(acc.Parts, elem.Parts...)
		}
	}
	*word = *top
	return true
}
07070100000055000081A4000003E800000064000000016046124D0000013D000000000000000000000000000000000000001D00000000sh-3.2.4/syntax/canonical.sh#!/bin/bash

# separate comment

! foo bar >a &

foo() { bar; }

{
	var1="some long value" # var1 comment
	var2=short             # var2 comment
}

if foo; then bar; fi

for foo in a b c; do
	bar
done

case $foo in
a) A ;;
b)
	B
	;;
esac

foo | bar
foo &&
	$(bar) &&
	(more)

foo 2>&1
foo <<-EOF
	bar
EOF

$((3 + 4))
07070100000056000081A4000003E800000064000000016046124D000000E2000000000000000000000000000000000000001700000000sh-3.2.4/syntax/doc.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

// Package syntax implements parsing and formatting of shell programs.
// It supports POSIX Shell, Bash, and mksh.
package syntax
07070100000057000081A4000003E800000064000000016046124D00000FB8000000000000000000000000000000000000002000000000sh-3.2.4/syntax/example_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax_test

import (
	"fmt"
	"os"
	"strings"

"mvdan.cc/sh/v3/syntax"
)

func Example() {
	r := strings.NewReader("{ foo; bar; }")
	f, err := syntax.NewParser().Parse(r, "")
	if err != nil {
		return
	}
	syntax.NewPrinter().Print(os.Stdout, f)
	// Output:
	// {
	//	foo
	//	bar
	// }
}

func ExampleWord() {
	r := strings.NewReader("echo foo${bar}'baz'")
	f, err := syntax.NewParser().Parse(r, "")
	if err != nil {
		return
	}

printer := syntax.NewPrinter()
	args := f.Stmts[0].Cmd.(*syntax.CallExpr).Args
	for i, word := range args {
		fmt.Printf("Word number %d:\n", i)
		for _, part := range word.Parts {
			fmt.Printf("%-20T - ", part)
			printer.Print(os.Stdout, part)
			fmt.Println()
		}
		fmt.Println()
	}

// Output:
	// Word number 0:
	// *syntax.Lit          - echo
	//
	// Word number 1:
	// *syntax.Lit          - foo
	// *syntax.ParamExp     - ${bar}
	// *syntax.SglQuoted    - 'baz'
}

func ExampleCommand() {
	r := strings.NewReader("echo foo; if x; then y; fi; foo | bar")
	f, err := syntax.NewParser().Parse(r, "")
	if err != nil {
		return
	}

printer := syntax.NewPrinter()
	for i, stmt := range f.Stmts {
		fmt.Printf("Cmd %d: %-20T - ", i, stmt.Cmd)
		printer.Print(os.Stdout, stmt.Cmd)
		fmt.Println()
	}

// Output:
	// Cmd 0: *syntax.CallExpr     - echo foo
	// Cmd 1: *syntax.IfClause     - if x; then y; fi
	// Cmd 2: *syntax.BinaryCmd    - foo | bar
}

func ExampleNewParser_options() {
	src := "for ((i = 0; i < 5; i++)); do echo $i >f; done"

// LangBash is the default
	r := strings.NewReader(src)
	f, err := syntax.NewParser().Parse(r, "")
	fmt.Println(err)

// Parser errors with LangPOSIX
	r = strings.NewReader(src)
	_, err = syntax.NewParser(syntax.Variant(syntax.LangPOSIX)).Parse(r, "")
	fmt.Println(err)

syntax.NewPrinter().Print(os.Stdout, f)
	syntax.NewPrinter(syntax.SpaceRedirects(true)).Print(os.Stdout, f)

// Output:
	// <nil>
	// 1:5: c-style fors are a bash feature
	// for ((i = 0; i < 5; i++)); do echo $i >f; done
	// for ((i = 0; i < 5; i++)); do echo $i > f; done
}

func ExampleWalk() {
	in := strings.NewReader(`echo $foo "and $bar"`)
	f, err := syntax.NewParser().Parse(in, "")
	if err != nil {
		return
	}
	syntax.Walk(f, func(node syntax.Node) bool {
		switch x := node.(type) {
		case *syntax.ParamExp:
			x.Param.Value = strings.ToUpper(x.Param.Value)
		}
		return true
	})
	syntax.NewPrinter().Print(os.Stdout, f)
	// Output: echo $FOO "and $BAR"
}

func ExampleDebugPrint() {
	in := strings.NewReader(`echo 'foo'`)
	f, err := syntax.NewParser().Parse(in, "")
	if err != nil {
		return
	}
	syntax.DebugPrint(os.Stdout, f)
	// Output:
	// *syntax.File {
	// .  Name: ""
	// .  Stmts: []*syntax.Stmt (len = 1) {
	// .  .  0: *syntax.Stmt {
	// .  .  .  Comments: []syntax.Comment (len = 0) {}
	// .  .  .  Cmd: *syntax.CallExpr {
	// .  .  .  .  Assigns: []*syntax.Assign (len = 0) {}
	// .  .  .  .  Args: []*syntax.Word (len = 2) {
	// .  .  .  .  .  0: *syntax.Word {
	// .  .  .  .  .  .  Parts: []syntax.WordPart (len = 1) {
	// .  .  .  .  .  .  .  0: *syntax.Lit {
	// .  .  .  .  .  .  .  .  ValuePos: 1:1
	// .  .  .  .  .  .  .  .  ValueEnd: 1:5
	// .  .  .  .  .  .  .  .  Value: "echo"
	// .  .  .  .  .  .  .  }
	// .  .  .  .  .  .  }
	// .  .  .  .  .  }
	// .  .  .  .  .  1: *syntax.Word {
	// .  .  .  .  .  .  Parts: []syntax.WordPart (len = 1) {
	// .  .  .  .  .  .  .  0: *syntax.SglQuoted {
	// .  .  .  .  .  .  .  .  Left: 1:6
	// .  .  .  .  .  .  .  .  Right: 1:10
	// .  .  .  .  .  .  .  .  Dollar: false
	// .  .  .  .  .  .  .  .  Value: "foo"
	// .  .  .  .  .  .  .  }
	// .  .  .  .  .  .  }
	// .  .  .  .  .  }
	// .  .  .  .  }
	// .  .  .  }
	// .  .  .  Position: 1:1
	// .  .  .  Semicolon: 0:0
	// .  .  .  Negated: false
	// .  .  .  Background: false
	// .  .  .  Coprocess: false
	// .  .  .  Redirs: []*syntax.Redirect (len = 0) {}
	// .  .  }
	// .  }
	// .  Last: []syntax.Comment (len = 0) {}
	// }
}
07070100000058000081A4000003E800000064000000016046124D00016BDC000000000000000000000000000000000000002200000000sh-3.2.4/syntax/filetests_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"reflect"
	"strings"
	"testing"
)

func prepareTest(c *testCase) {
	c.common = fullProg(c.common)
	c.bash = fullProg(c.bash)
	c.posix = fullProg(c.posix)
	c.mksh = fullProg(c.mksh)
	c.bsmk = fullProg(c.bsmk) // bash AND mksh
	c.bats = fullProg(c.bats)
	if f, ok := c.common.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.Bash = f
		c.Posix = f
		c.MirBSDKorn = f
		c.Bats = f
	}
	if f, ok := c.bash.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.Bash = f
		c.Bats = f
	}
	if f, ok := c.posix.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.Posix = f
	}
	if f, ok := c.mksh.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.MirBSDKorn = f
	}
	if f, ok := c.bsmk.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.Bash = f
		c.MirBSDKorn = f
	}
	if f, ok := c.bats.(*File); ok && f != nil {
		c.All = append(c.All, f)
		c.Bats = f
	}
}

func init() {
	for i := range fileTests {
		prepareTest(&fileTests[i])
	}
	for i := range fileTestsNoPrint {
		prepareTest(&fileTestsNoPrint[i])
	}
}

func lit(s string) *Lit         { return &Lit{Value: s} }
func word(ps ...WordPart) *Word { return &Word{Parts: ps} }
func litWord(s string) *Word    { return word(lit(s)) }
func litWords(strs ...string) []*Word {
	l := make([]*Word, 0, len(strs))
	for _, s := range strs {
		l = append(l, litWord(s))
	}
	return l
}

func call(words ...*Word) *CallExpr    { return &CallExpr{Args: words} }
func litCall(strs ...string) *CallExpr { return call(litWords(strs...)...) }

func stmt(cmd Command) *Stmt { return &Stmt{Cmd: cmd} }
func stmts(cmds ...Command) []*Stmt {
	l := make([]*Stmt, len(cmds))
	for i, cmd := range cmds {
		l[i] = stmt(cmd)
	}
	return l
}

func litStmt(strs ...string) *Stmt { return stmt(litCall(strs...)) }
func litStmts(strs ...string) []*Stmt {
	l := make([]*Stmt, len(strs))
	for i, s := range strs {
		l[i] = litStmt(s)
	}
	return l
}

func sglQuoted(s string) *SglQuoted        { return &SglQuoted{Value: s} }
func sglDQuoted(s string) *SglQuoted       { return &SglQuoted{Dollar: true, Value: s} }
func dblQuoted(ps ...WordPart) *DblQuoted  { return &DblQuoted{Parts: ps} }
func dblDQuoted(ps ...WordPart) *DblQuoted { return &DblQuoted{Dollar: true, Parts: ps} }
func block(sts ...*Stmt) *Block            { return &Block{Stmts: sts} }
func subshell(sts ...*Stmt) *Subshell      { return &Subshell{Stmts: sts} }
func arithmExp(e ArithmExpr) *ArithmExp    { return &ArithmExp{X: e} }
func arithmExpBr(e ArithmExpr) *ArithmExp  { return &ArithmExp{Bracket: true, X: e} }
func arithmCmd(e ArithmExpr) *ArithmCmd    { return &ArithmCmd{X: e} }
func parenArit(e ArithmExpr) *ParenArithm  { return &ParenArithm{X: e} }
func parenTest(e TestExpr) *ParenTest      { return &ParenTest{X: e} }

func cmdSubst(sts ...*Stmt) *CmdSubst { return &CmdSubst{Stmts: sts} }
func litParamExp(s string) *ParamExp {
	return &ParamExp{Short: true, Param: lit(s)}
}

func letClause(exps ...ArithmExpr) *LetClause {
	return &LetClause{Exprs: exps}
}

func arrValues(words ...*Word) *ArrayExpr {
	ae := &ArrayExpr{}
	for _, w := range words {
		ae.Elems = append(ae.Elems, &ArrayElem{Value: w})
	}
	return ae
}

type testCase struct {
	Strs        []string
	common      interface{}
	bash, posix interface{}
	bsmk, mksh  interface{}
	bats        interface{}
	All         []*File
	Bash, Posix *File
	MirBSDKorn  *File
	Bats        *File
}

Then: litStmts("b"),
		},
	},
	{
		Strs: []string{`((a == 2))`},
		bsmk: arithmCmd(&BinaryArithm{
			Op: Eql,
			X:  litWord("a"),
			Y:  litWord("2"),
		}),
		posix: subshell(stmt(subshell(litStmt("a", "==", "2")))),
	},
	{
		Strs: []string{"if (($# > 2)); then b; fi"},
		bsmk: &IfClause{
			Cond: stmts(arithmCmd(&BinaryArithm{
				Op: Gtr,
				X:  word(litParamExp("#")),
				Y:  litWord("2"),
			})),
			Then: litStmts("b"),
		},
	},
	{
		Strs: []string{
			"(($(date -u) > DATE))",
			"((`date -u` > DATE))",
		},
		bsmk: arithmCmd(&BinaryArithm{
			Op: Gtr,
			X:  word(cmdSubst(litStmt("date", "-u"))),
			Y:  litWord("DATE"),
		}),
	},
	{
		Strs: []string{": $((0x$foo == 10))"},
		common: call(
			litWord(":"),
			word(arithmExp(&BinaryArithm{
				Op: Eql,
				X:  word(lit("0x"), litParamExp("foo")),
				Y:  litWord("10"),
			})),
		),
	},
	{
		Strs: []string{"((# 1 + 2))", "(( # 1 + 2 ))"},
		mksh: &ArithmCmd{
			X: &BinaryArithm{
				Op: Add,
				X:  litWord("1"),
				Y:  litWord("2"),
			},
			Unsigned: true,
		},
	},
	{
		Strs: []string{"$((# 1 + 2))", "$(( # 1 + 2 ))"},
		mksh: &ArithmExp{
			X: &BinaryArithm{
				Op: Add,
				X:  litWord("1"),
				Y:  litWord("2"),
			},
			Unsigned: true,
		},
	},
	{
		Strs: []string{"((3#20))"},
		bsmk: arithmCmd(litWord("3#20")),
	},
	{
		Strs: []string{
			"while a; do b; done",
			"wh\\\nile a; do b; done",
			"while a\ndo\nb\ndone",
			"while a;\ndo\nb\ndone",
		},
		common: &WhileClause{
			Cond: litStmts("a"),
			Do:   litStmts("b"),
		},
	},
	{
		Strs: []string{"while { a; }; do b; done", "while { a; } do b; done"},
		common: &WhileClause{
			Cond: stmts(block(litStmt("a"))),
			Do:   litStmts("b"),
		},
	},
	{
		Strs: []string{"while (a); do b; done", "while (a) do b; done"},
		common: &WhileClause{
			Cond: stmts(subshell(litStmt("a"))),
			Do:   litStmts("b"),
		},
	},
	{
		Strs: []string{"while ((1 > 2)); do b; done"},
		bsmk: &WhileClause{
			Cond: stmts(arithmCmd(&BinaryArithm{
				Op: Gtr,
				X:  litWord("1"),
				Y:  litWord("2"),
			})),
			Do: litStmts("b"),
		},
	},
	{
		Strs: []string{"until a; do b; done", "until a\ndo\nb\ndone"},
		common: &WhileClause{
			Until: true,
			Cond:  litStmts("a"),
			Do:    litStmts("b"),
		},
	},
	{
		Strs: []string{
			"for i; do foo; done",
			"for i do foo; done",
			"for i\ndo foo\ndone",
			"for i;\ndo foo\ndone",
			"for i in; do foo; done",
		},
		common: &ForClause{
			Loop: &WordIter{Name: lit("i")},
			Do:   litStmts("foo"),
		},
	},
	{
		Strs: []string{
			"for i in 1 2 3; do echo $i; done",
			"for i in 1 2 3\ndo echo $i\ndone",
			"for i in 1 2 3;\ndo echo $i\ndone",
			"for i in 1 2 3 #foo\ndo echo $i\ndone",
		},
		common: &ForClause{
			Loop: &WordIter{
				Name:  lit("i"),
				Items: litWords("1", "2", "3"),
			},
			Do: stmts(call(
				litWord("echo"),
				word(litParamExp("i")),
			)),
		},
	},
	{
		Strs: []string{
			"for i in \\\n\t1 2 3; do #foo\n\techo $i\ndone",
			"for i #foo\n\tin 1 2 3; do\n\techo $i\ndone",
		},
		common: &ForClause{
			Loop: &WordIter{
				Name:  lit("i"),
				Items: litWords("1", "2", "3"),
			},
			Do: stmts(call(
				litWord("echo"),
				word(litParamExp("i")),
			)),
		},
	},
	{
		Strs: []string{
			"for i; do foo; done",
			"for i; { foo; }",
		},
		bsmk: &ForClause{
			Loop: &WordIter{Name: lit("i")},
			Do:   litStmts("foo"),
		},
	},
	{
		Strs: []string{
			"for i in 1 2 3; do echo $i; done",
			"for i in 1 2 3; { echo $i; }",
		},
		bsmk: &ForClause{
			Loop: &WordIter{
				Name:  lit("i"),
				Items: litWords("1", "2", "3"),
			},
			Do: stmts(call(
				litWord("echo"),
				word(litParamExp("i")),
			)),
		},
	},
	{
		Strs: []string{
			"for ((i = 0; i < 10; i++)); do echo $i; done",
			"for ((i=0;i<10;i++)) do echo $i; done",
			"for (( i = 0 ; i < 10 ; i++ ))\ndo echo $i\ndone",
			"for (( i = 0 ; i < 10 ; i++ ));\ndo echo $i\ndone",
		},
		bash: &ForClause{
			Loop: &CStyleLoop{
				Init: &BinaryArithm{
					Op: Assgn,
					X:  litWord("i"),
					Y:  litWord("0"),
				},
				Cond: &BinaryArithm{
					Op: Lss,
					X:  litWord("i"),
					Y:  litWord("10"),
				},
				Post: &UnaryArithm{
					Op:   Inc,
					Post: true,
					X:    litWord("i"),
				},
			},
			Do: stmts(call(
				litWord("echo"),
				word(litParamExp("i")),
			)),
		},
	},
	{
		Strs: []string{
			"for (( ; ; )); do foo; done",
			"for ((;;)); do foo; done",
		},
		bash: &ForClause{
			Loop: &CStyleLoop{},
			Do:   litStmts("foo"),
		},
	},
	{
		Strs: []string{
			"for ((i = 0; ; )); do foo; done",
			"for ((i = 0;;)); do foo; done",
		},
		bash: &ForClause{
			Loop: &CStyleLoop{
				Init: &BinaryArithm{
					Op: Assgn,
					X:  litWord("i"),
					Y:  litWord("0"),
				},
			},
			Do: litStmts("foo"),
		},
	},
	{
		Strs: []string{
			"select i; do foo; done",
			// TODO: bash won't allow this - bug?
			//"select i in; do foo; done",
		},
		bsmk: &ForClause{
			Select: true,
			Loop:   &WordIter{Name: lit("i")},
			Do:     litStmts("foo"),
		},
	},
	{
		Strs: []string{
			"select i in 1 2 3; do echo $i; done",
			"select i in 1 2 3\ndo echo $i\ndone",
			"select i in 1 2 3 #foo\ndo echo $i\ndone",
		},
		bsmk: &ForClause{
			Select: true,
			Loop: &WordIter{
				Name:  lit("i"),
				Items: litWords("1", "2", "3"),
			},
			Do: stmts(call(
				litWord("echo"),
				word(litParamExp("i")),
			)),
		},
	},
	{
		Strs:  []string{"select foo bar"},
		posix: litStmt("select", "foo", "bar"),
	},
	{
		Strs: []string{`' ' "foo bar"`},
		common: call(
			word(sglQuoted(" ")),
			word(dblQuoted(lit("foo bar"))),
		),
	},
	{
		Strs:   []string{`"foo \" bar"`},
		common: word(dblQuoted(lit(`foo \" bar`))),
	},
	{
		Strs: []string{"\">foo\" \"\nbar\""},
		common: call(
			word(dblQuoted(lit(">foo"))),
			word(dblQuoted(lit("\nbar"))),
		),
	},
	{
		Strs:   []string{`foo \" bar`},
		common: litCall(`foo`, `\"`, `bar`),
	},
	{
		Strs:   []string{`'"'`},
		common: sglQuoted(`"`),
	},
	{
		Strs:   []string{"'`'"},
		common: sglQuoted("`"),
	},
	{
		Strs:   []string{`"'"`},
		common: dblQuoted(lit("'")),
	},
	{
		Strs:   []string{`""`},
		common: dblQuoted(),
	},
	{
		Strs:   []string{"=a s{s s=s"},
		common: litCall("=a", "s{s", "s=s"),
	},
	{
		Strs: []string{"foo && bar", "foo&&bar", "foo &&\nbar"},
		common: &BinaryCmd{
			Op: AndStmt,
			X:  litStmt("foo"),
			Y:  litStmt("bar"),
		},
	},
	{
		Strs: []string{"foo &&\n\tbar"},
		common: &BinaryCmd{
			Op: AndStmt,
			X:  litStmt("foo"),
			Y:  litStmt("bar"),
		},
	},
	{
		Strs: []string{"foo || bar", "foo||bar", "foo ||\nbar"},
		common: &BinaryCmd{
			Op: OrStmt,
			X:  litStmt("foo"),
			Y:  litStmt("bar"),
		},
	},
	{
		Strs: []string{"if a; then b; fi || while a; do b; done"},
		common: &BinaryCmd{
			Op: OrStmt,
			X: stmt(&IfClause{
				Cond: litStmts("a"),
				Then: litStmts("b"),
			}),
			Y: stmt(&WhileClause{
				Cond: litStmts("a"),
				Do:   litStmts("b"),
			}),
		},
	},
	{
		Strs: []string{"foo && bar1 || bar2"},
		common: &BinaryCmd{
			Op: OrStmt,
			X: stmt(&BinaryCmd{
				Op: AndStmt,
				X:  litStmt("foo"),
				Y:  litStmt("bar1"),
			}),
			Y: litStmt("bar2"),
		},
	},
	{
		Strs: []string{"a || b || c || d"},
		common: &BinaryCmd{
			Op: OrStmt,
			X: stmt(&BinaryCmd{
				Op: OrStmt,
				X: stmt(&BinaryCmd{
					Op: OrStmt,
					X:  litStmt("a"),
					Y:  litStmt("b"),
				}),
				Y: litStmt("c"),
			}),
			Y: litStmt("d"),
		},
	},
	{
		Strs: []string{"foo | bar", "foo|bar", "foo |\n#etc\nbar"},
		common: &BinaryCmd{
			Op: Pipe,
			X:  litStmt("foo"),
			Y:  litStmt("bar"),
		},
	},
	{
		Strs: []string{"foo | bar | extra"},
		common: &BinaryCmd{
			Op: Pipe,
			X: stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("foo"),
				Y:  litStmt("bar"),
			}),
			Y: litStmt("extra"),
		},
	},
	{
		Strs: []string{"foo | a=b bar"},
		common: &BinaryCmd{
			Op: Pipe,
			X:  litStmt("foo"),
			Y: stmt(&CallExpr{
				Assigns: []*Assign{{
					Name:  lit("a"),
					Value: litWord("b"),
				}},
				Args: litWords("bar"),
			}),
		},
	},
	{
		Strs: []string{"foo |&"},
		mksh: &Stmt{Cmd: litCall("foo"), Coprocess: true},
	},
	{
		Strs: []string{"foo |& bar", "foo|&bar"},
		bash: &BinaryCmd{
			Op: PipeAll,
			X:  litStmt("foo"),
			Y:  litStmt("bar"),
		},
		mksh: []*Stmt{
			{Cmd: litCall("foo"), Coprocess: true},
			litStmt("bar"),
		},
	},
	{
		Strs: []string{
			"foo() {\n\ta\n\tb\n}",
			"foo() { a; b; }",
			"foo ( ) {\na\nb\n}",
			"foo()\n{\na\nb\n}",
		},
		common: &FuncDecl{
			Parens: true,
			Name:   lit("foo"),
			Body:   stmt(block(litStmt("a"), litStmt("b"))),
		},
	},
	{
		Strs: []string{"foo() { a; }\nbar", "foo() {\na\n}; bar"},
		common: []Command{
			&FuncDecl{
				Parens: true,
				Name:   lit("foo"),
				Body:   stmt(block(litStmt("a"))),
			},
			litCall("bar"),
		},
	},
	{
		Strs: []string{"foO_123() { a; }"},
		common: &FuncDecl{
			Parens: true,
			Name:   lit("foO_123"),
			Body:   stmt(block(litStmt("a"))),
		},
	},
	{
		Strs: []string{"-foo_.,+-bar() { a; }"},
		bsmk: &FuncDecl{
			Parens: true,
			Name:   lit("-foo_.,+-bar"),
			Body:   stmt(block(litStmt("a"))),
		},
	},
	{
		Strs: []string{
			"function foo() {\n\ta\n\tb\n}",
			"function foo() { a; b; }",
		},
		bsmk: &FuncDecl{
			RsrvWord: true,
			Parens:   true,
			Name:     lit("foo"),
			Body:     stmt(block(litStmt("a"), litStmt("b"))),
		},
	},
	{
		Strs: []string{
			"function foo {\n\ta\n\tb\n}",
			"function foo { a; b; }",
		},
		bsmk: &FuncDecl{
			RsrvWord: true,
			Name:     lit("foo"),
			Body:     stmt(block(litStmt("a"), litStmt("b"))),
		},
	},
	{
		Strs: []string{"function foo() (a)"},
		bash: &FuncDecl{
			RsrvWord: true,
			Parens:   true,
			Name:     lit("foo"),
			Body:     stmt(subshell(litStmt("a"))),
		},
	},
	{
		Strs: []string{"a=b foo=$bar foo=start$bar"},
		common: &CallExpr{
			Assigns: []*Assign{
				{Name: lit("a"), Value: litWord("b")},
				{Name: lit("foo"), Value: word(litParamExp("bar"))},
				{Name: lit("foo"), Value: word(
					lit("start"),
					litParamExp("bar"),
				)},
			},
		},
	},
	{
		Strs: []string{"a=\"\nbar\""},
		common: &CallExpr{
			Assigns: []*Assign{{
				Name:  lit("a"),
				Value: word(dblQuoted(lit("\nbar"))),
			}},
		},
	},
	{
		Strs: []string{"A_3a= foo"},
		common: &CallExpr{
			Assigns: []*Assign{{Name: lit("A_3a")}},
			Args:    litWords("foo"),
		},
	},
	{
		Strs: []string{"a=b=c"},
		common: &CallExpr{
			Assigns: []*Assign{{Name: lit("a"), Value: litWord("b=c")}},
		},
	},
	{
		Strs:   []string{"à=b foo"},
		common: litStmt("à=b", "foo"),
	},
	{
		Strs: []string{
			"foo >a >>b <c",
			"foo > a >> b < c",
			">a >>b <c foo",
		},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("a")},
				{Op: AppOut, Word: litWord("b")},
				{Op: RdrIn, Word: litWord("c")},
			},
		},
	},
	{
		Strs: []string{
			"foo bar >a",
			"foo >a bar",
		},
		common: &Stmt{
			Cmd: litCall("foo", "bar"),
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("a")},
			},
		},
	},
	{
		Strs: []string{`>a >\b`},
		common: &Stmt{
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("a")},
				{Op: RdrOut, Word: litWord(`\b`)},
			},
		},
	},
	{
		Strs: []string{">a\n>b", ">a; >b"},
		common: []*Stmt{
			{Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("a")},
			}},
			{Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("b")},
			}},
		},
	},
	{
		Strs: []string{"foo1\nfoo2 >r2", "foo1; >r2 foo2"},
		common: []*Stmt{
			litStmt("foo1"),
			{
				Cmd: litCall("foo2"),
				Redirs: []*Redirect{
					{Op: RdrOut, Word: litWord("r2")},
				},
			},
		},
	},
	{
		Strs: []string{"foo >bar$(etc)", "foo >b\\\nar`etc`"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: RdrOut, Word: word(
					lit("bar"),
					cmdSubst(litStmt("etc")),
				)},
			},
		},
	},
	{
		Strs: []string{
			"a=b c=d foo >x <y",
			"a=b c=d >x <y foo",
			">x a=b c=d <y foo",
			">x <y a=b c=d foo",
			"a=b >x c=d foo <y",
		},
		common: &Stmt{
			Cmd: &CallExpr{
				Assigns: []*Assign{
					{Name: lit("a"), Value: litWord("b")},
					{Name: lit("c"), Value: litWord("d")},
				},
				Args: litWords("foo"),
			},
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("x")},
				{Op: RdrIn, Word: litWord("y")},
			},
		},
	},
	{
		Strs: []string{
			"foo <<EOF\nbar\nEOF",
			"foo <<EOF \nbar\nEOF",
			"foo <<EOF\t\nbar\nEOF",
		},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<EOF\n\nbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("\nbar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<EOF\nbar\n\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<EOF\n1\n2\n3\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("1\n2\n3\n"),
			}},
		},
	},
	{
		Strs: []string{"a <<EOF\nfoo$bar\nEOF"},
		common: &Stmt{
			Cmd: litCall("a"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: word(
					lit("foo"),
					litParamExp("bar"),
					lit("\n"),
				),
			}},
		},
	},
	{
		Strs: []string{"a <<EOF\n\"$bar\"\nEOF"},
		common: &Stmt{
			Cmd: litCall("a"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: word(
					lit(`"`),
					litParamExp("bar"),
					lit("\"\n"),
				),
			}},
		},
	},
	{
		Strs: []string{"a <<EOF\n$''$bar\nEOF"},
		bash: &Stmt{
			Cmd: litCall("a"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: word(
					lit("$"),
					lit("''"),
					litParamExp("bar"),
					lit("\n"),
				),
			}},
		},
	},
	{
		Strs: []string{
			"a <<EOF\n$(b)\nc\nEOF",
			"a <<EOF\n`b`\nc\nEOF",
		},
		common: &Stmt{
			Cmd: litCall("a"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: word(
					cmdSubst(litStmt("b")),
					lit("\nc\n"),
				),
			}},
		},
	},
	{
		Strs: []string{"a <<EOF\n\\${\nEOF"},
		common: &Stmt{
			Cmd: litCall("a"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("\\${\n"),
			}},
		},
	},
	{
		Strs: []string{
			"{\n\tfoo <<EOF\nbar\nEOF\n}",
			"{ foo <<EOF\nbar\nEOF\n}",
		},
		common: block(&Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		}),
	},
	{
		Strs: []string{
			"$(\n\tfoo <<EOF\nbar\nEOF\n)",
			"$(foo <<EOF\nbar\nEOF\n)",
		},
		common: cmdSubst(&Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		}),
	},
	{
		Strs: []string{"$(<foo)", "`<foo`"},
		common: cmdSubst(&Stmt{
			Redirs: []*Redirect{{
				Op:   RdrIn,
				Word: litWord("foo"),
			}},
		}),
	},
	{
		Strs: []string{"foo <<EOF >f\nbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{
					Op:   Hdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("bar\n"),
				},
				{Op: RdrOut, Word: litWord("f")},
			},
		},
	},
	{
		Strs: []string{"foo <<EOF && {\nbar\nEOF\n\tetc\n}"},
		common: &BinaryCmd{
			Op: AndStmt,
			X: &Stmt{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("bar\n"),
				}},
			},
			Y: stmt(block(litStmt("etc"))),
		},
	},
	{
		Strs: []string{
			"$(\n\tfoo\n) <<EOF\nbar\nEOF",
			"<<EOF $(\n\tfoo\n)\nbar\nEOF",
		},
		// note that dash won't accept the second one
		bsmk: &Stmt{
			Cmd: call(word(cmdSubst(litStmt("foo")))),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{
			"$(\n\tfoo\n) <<EOF\nbar\nEOF",
			"`\n\tfoo\n` <<EOF\nbar\nEOF",
			"<<EOF `\n\tfoo\n`\nbar\nEOF",
		},
		common: &Stmt{
			Cmd: call(word(cmdSubst(litStmt("foo")))),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{
			"$((foo)) <<EOF\nbar\nEOF",
			"<<EOF $((\n\tfoo\n))\nbar\nEOF",
		},
		common: &Stmt{
			Cmd: call(word(arithmExp(litWord("foo")))),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"if true; then\n\tfoo <<-EOF\n\t\tbar\n\tEOF\nfi"},
		common: &IfClause{
			Cond: litStmts("true"),
			Then: []*Stmt{{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{{
					Op:   DashHdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("\t\tbar\n\t"),
				}},
			}},
		},
	},
	{
		Strs: []string{"if true; then\n\tfoo <<-EOF\n\tEOF\nfi"},
		common: &IfClause{
			Cond: litStmts("true"),
			Then: []*Stmt{{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{{
					Op:   DashHdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("\t"),
				}},
			}},
		},
	},
	{
		Strs: []string{"foo <<EOF\nEOF_body\nEOF\nfoo2"},
		common: []*Stmt{
			{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("EOF_body\n"),
				}},
			},
			litStmt("foo2"),
		},
	},
	{
		Strs: []string{"foo <<FOOBAR\nbar\nFOOBAR"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("FOOBAR"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<\"EOF\"\nbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: word(dblQuoted(lit("EOF"))),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<'EOF'\nEOF_body\nEOF\nfoo2"},
		common: []*Stmt{
			{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: word(sglQuoted("EOF")),
					Hdoc: litWord("EOF_body\n"),
				}},
			},
			litStmt("foo2"),
		},
	},
	{
		Strs: []string{"foo <<'EOF'\n${\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: word(sglQuoted("EOF")),
				Hdoc: litWord("${\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<'EOF'\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: word(sglQuoted("EOF")),
			}},
		},
	},
	{
		Strs: []string{"foo <<\"EOF\"2\nbar\nEOF2"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: word(dblQuoted(lit("EOF")), lit("2")),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<\\EOF\nbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("\\EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<-EOF\n\tbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   DashHdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("\tbar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<EOF\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
			}},
		},
	},
	{
		Strs: []string{"foo <<-EOF\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   DashHdoc,
				Word: litWord("EOF"),
			}},
		},
	},
	{
		Strs: []string{"foo <<-EOF\n\tbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   DashHdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("\tbar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo <<-'EOF'\n\tbar\nEOF"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   DashHdoc,
				Word: word(sglQuoted("EOF")),
				Hdoc: litWord("\tbar\n"),
			}},
		},
	},
	{
		Strs: []string{
			"f1 <<EOF1\nh1\nEOF1\nf2 <<EOF2\nh2\nEOF2",
			"f1 <<EOF1; f2 <<EOF2\nh1\nEOF1\nh2\nEOF2",
		},
		common: []*Stmt{
			{
				Cmd: litCall("f1"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF1"),
					Hdoc: litWord("h1\n"),
				}},
			},
			{
				Cmd: litCall("f2"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF2"),
					Hdoc: litWord("h2\n"),
				}},
			},
		},
	},
	{
		Strs: []string{
			"a <<EOF\nfoo\nEOF\nb\nb\nb\nb\nb\nb\nb\nb\nb",
			"a <<EOF;b;b;b;b;b;b;b;b;b\nfoo\nEOF",
		},
		common: []*Stmt{
			{
				Cmd: litCall("a"),
				Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("foo\n"),
				}},
			},
			litStmt("b"), litStmt("b"), litStmt("b"),
			litStmt("b"), litStmt("b"), litStmt("b"),
			litStmt("b"), litStmt("b"), litStmt("b"),
		},
	},
	{
		Strs: []string{
			"foo \"\narg\" <<EOF\nbar\nEOF",
			"foo <<EOF \"\narg\"\nbar\nEOF",
		},
		common: &Stmt{
			Cmd: call(
				litWord("foo"),
				word(dblQuoted(lit("\narg"))),
			),
			Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("bar\n"),
			}},
		},
	},
	{
		Strs: []string{"foo >&2 <&0 2>file 345>file <>f2"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: DplOut, Word: litWord("2")},
				{Op: DplIn, Word: litWord("0")},
				{Op: RdrOut, N: lit("2"), Word: litWord("file")},
				{Op: RdrOut, N: lit("345"), Word: litWord("file")},
				{Op: RdrInOut, Word: litWord("f2")},
			},
		},
	},
	{
		Strs: []string{
			"foo bar >file",
			"foo bar>file",
		},
		common: &Stmt{
			Cmd: litCall("foo", "bar"),
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("file")},
			},
		},
	},
	{
		Strs: []string{"foo &>a &>>b"},
		bsmk: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: RdrAll, Word: litWord("a")},
				{Op: AppAll, Word: litWord("b")},
			},
		},
		posix: []*Stmt{
			{Cmd: litCall("foo"), Background: true},
			{Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("a")},
			}, Background: true},
			{Redirs: []*Redirect{
				{Op: AppOut, Word: litWord("b")},
			}},
		},
	},
	{
		Strs: []string{"foo 2>file bar", "2>file foo bar"},
		common: &Stmt{
			Cmd: litCall("foo", "bar"),
			Redirs: []*Redirect{
				{Op: RdrOut, N: lit("2"), Word: litWord("file")},
			},
		},
	},
	{
		Strs: []string{"a >f1\nb >f2", "a >f1; b >f2"},
		common: []*Stmt{
			{
				Cmd:    litCall("a"),
				Redirs: []*Redirect{{Op: RdrOut, Word: litWord("f1")}},
			},
			{
				Cmd:    litCall("b"),
				Redirs: []*Redirect{{Op: RdrOut, Word: litWord("f2")}},
			},
		},
	},
	{
		Strs: []string{"foo >|bar"},
		common: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: ClbOut, Word: litWord("bar")},
			},
		},
	},
	{
		Strs: []string{
			"foo <<<input",
			"foo <<< input",
		},
		bsmk: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   WordHdoc,
				Word: litWord("input"),
			}},
		},
	},
	{
		Strs: []string{
			`foo <<<"spaced input"`,
			`foo <<< "spaced input"`,
		},
		bsmk: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op:   WordHdoc,
				Word: word(dblQuoted(lit("spaced input"))),
			}},
		},
	},
	{
		Strs: []string{"foo >(foo)"},
		bash: call(
			litWord("foo"),
			word(&ProcSubst{
				Op:    CmdOut,
				Stmts: litStmts("foo"),
			}),
		),
	},
	{
		Strs: []string{"foo < <(foo)"},
		bash: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{{
				Op: RdrIn,
				Word: word(&ProcSubst{
					Op:    CmdIn,
					Stmts: litStmts("foo"),
				}),
			}},
		},
	},
	{
		Strs: []string{"a<(b) c>(d)"},
		bash: call(
			word(lit("a"), &ProcSubst{
				Op:    CmdIn,
				Stmts: litStmts("b"),
			}),
			word(lit("c"), &ProcSubst{
				Op:    CmdOut,
				Stmts: litStmts("d"),
			}),
		),
	},
	{
		Strs: []string{"foo {fd}<f"},
		bash: &Stmt{
			Cmd: litCall("foo"),
			Redirs: []*Redirect{
				{Op: RdrIn, N: lit("{fd}"), Word: litWord("f")},
			},
		},
	},
	{
		Strs: []string{"! foo"},
		common: &Stmt{
			Negated: true,
			Cmd:     litCall("foo"),
		},
	},
	{
		Strs: []string{"foo &\nbar", "foo & bar", "foo&bar"},
		common: []*Stmt{
			{Cmd: litCall("foo"), Background: true},
			litStmt("bar"),
		},
	},
	{
		Strs: []string{
			"! if foo; then bar; fi >/dev/null &",
			"! if foo; then bar; fi>/dev/null&",
		},
		common: &Stmt{
			Negated: true,
			Cmd: &IfClause{
				Cond: litStmts("foo"),
				Then: litStmts("bar"),
			},
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("/dev/null")},
			},
			Background: true,
		},
	},
	{
		Strs: []string{"! foo && bar"},
		common: &BinaryCmd{
			Op: AndStmt,
			X: &Stmt{
				Cmd:     litCall("foo"),
				Negated: true,
			},
			Y: litStmt("bar"),
		},
	},
	{
		Strs: []string{"! foo | bar"},
		common: &Stmt{
			Cmd: &BinaryCmd{
				Op: Pipe,
				X:  litStmt("foo"),
				Y:  litStmt("bar"),
			},
			Negated: true,
		},
	},
	{
		Strs: []string{
			"a && b &\nc",
			"a && b & c",
		},
		common: []*Stmt{
			{
				Cmd: &BinaryCmd{
					Op: AndStmt,
					X:  litStmt("a"),
					Y:  litStmt("b"),
				},
				Background: true,
			},
			litStmt("c"),
		},
	},
	{
		Strs: []string{"a | b &"},
		common: &Stmt{
			Cmd: &BinaryCmd{
				Op: Pipe,
				X:  litStmt("a"),
				Y:  litStmt("b"),
			},
			Background: true,
		},
	},
	{
		Strs:   []string{"foo#bar"},
		common: litWord("foo#bar"),
	},
	{
		Strs:   []string{"{ echo } }; }"},
		common: block(litStmt("echo", "}", "}")),
	},
	{
		Strs: []string{"$({ echo; })"},
		common: cmdSubst(stmt(
			block(litStmt("echo")),
		)),
	},
	{
		Strs: []string{
			"$( (echo foo bar))",
			"$( (echo foo bar) )",
			"`(echo foo bar)`",
		},
		common: cmdSubst(stmt(
			subshell(litStmt("echo", "foo", "bar")),
		)),
	},
	{
		Strs:   []string{"$()"},
		common: cmdSubst(),
	},
	{
		Strs: []string{"()"},
		mksh: subshell(), // not common, as dash/bash wrongly error
	},
	{
		Strs: []string{
			"$(\n\t(a)\n\tb\n)",
			"$( (a); b)",
			"`(a); b`",
		},
		common: cmdSubst(
			stmt(subshell(litStmt("a"))),
			litStmt("b"),
		),
	},
	{
		Strs: []string{
			`$(echo \')`,
			"`" + `echo \\'` + "`",
		},
		common: cmdSubst(litStmt("echo", `\'`)),
	},
	{
		Strs: []string{
			`$(echo \\)`,
			"`" + `echo \\\\` + "`",
		},
		common: cmdSubst(litStmt("echo", `\\`)),
	},
	{
		Strs: []string{
			`$(echo '\' 'a\b' "\\" "a\a")`,
			"`" + `echo '\' 'a\b' "\\\\" "a\a"` + "`",
		},
		common: cmdSubst(stmt(call(
			litWord("echo"),
			word(sglQuoted(`\`)),
			word(sglQuoted(`a\b`)),
			word(dblQuoted(lit(`\\`))),
			word(dblQuoted(lit(`a\a`))),
		))),
	},
	{
		Strs: []string{
			"$(echo $(x))",
			"`echo \\`x\\``",
		},
		common: cmdSubst(stmt(call(
			litWord("echo"),
			word(cmdSubst(litStmt("x"))),
		))),
	},
	{
		Strs: []string{
			"$($(foo bar))",
			"`\\`foo bar\\``",
		},
		common: cmdSubst(stmt(call(
			word(cmdSubst(litStmt("foo", "bar"))),
		))),
	},
	{
		Strs: []string{"$( (a) | b)"},
		common: cmdSubst(
			stmt(&BinaryCmd{
				Op: Pipe,
				X:  stmt(subshell(litStmt("a"))),
				Y:  litStmt("b"),
			}),
		),
	},
	{
		Strs: []string{`"$( (foo))"`},
		common: dblQuoted(cmdSubst(stmt(
			subshell(litStmt("foo")),
		))),
	},
	{
		Strs: []string{"$({ echo; })", "`{ echo; }`"},
		common: cmdSubst(stmt(
			block(litStmt("echo")),
		)),
	},
	{
		Strs:   []string{`{foo}`},
		common: litWord(`{foo}`),
	},
	{
		Strs:   []string{`{"foo"`},
		common: word(lit("{"), dblQuoted(lit("foo"))),
	},
	{
		Strs:   []string{`foo"bar"`, "fo\\\no\"bar\""},
		common: word(lit("foo"), dblQuoted(lit("bar"))),
	},
	{
		Strs:   []string{`!foo`},
		common: litWord(`!foo`),
	},
	{
		Strs:   []string{"$(foo bar)", "`foo bar`"},
		common: cmdSubst(litStmt("foo", "bar")),
	},
	{
		Strs: []string{"$(foo | bar)", "`foo | bar`"},
		common: cmdSubst(
			stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("foo"),
				Y:  litStmt("bar"),
			}),
		),
	},
	{
		Strs: []string{"$(foo | >f)", "`foo | >f`"},
		common: cmdSubst(
			stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("foo"),
				Y: &Stmt{Redirs: []*Redirect{{
					Op:   RdrOut,
					Word: litWord("f"),
				}}},
			}),
		),
	},
	{
		Strs: []string{"$(foo $(b1 b2))"},
		common: cmdSubst(stmt(call(
			litWord("foo"),
			word(cmdSubst(litStmt("b1", "b2"))),
		))),
	},
	{
		Strs: []string{`"$(foo "bar")"`},
		common: dblQuoted(cmdSubst(stmt(call(
			litWord("foo"),
			word(dblQuoted(lit("bar"))),
		)))),
	},
	{
		Strs:   []string{"$(foo)", "`fo\\\no`"},
		common: cmdSubst(litStmt("foo")),
	},
	{
		Strs: []string{"foo $(bar)", "foo `bar`"},
		common: call(
			litWord("foo"),
			word(cmdSubst(litStmt("bar"))),
		),
	},
	{
		Strs: []string{"$(foo 'bar')", "`foo 'bar'`"},
		common: cmdSubst(stmt(call(
			litWord("foo"),
			word(sglQuoted("bar")),
		))),
	},
	{
		Strs: []string{`$(foo "bar")`, "`foo \"bar\"`"},
		common: cmdSubst(stmt(call(
			litWord("foo"),
			word(dblQuoted(lit("bar"))),
		))),
	},
	{
		Strs: []string{`"$(foo "bar")"`, "\"`foo \"bar\"`\""},
		common: dblQuoted(cmdSubst(stmt(call(
			litWord("foo"),
			word(dblQuoted(lit("bar"))),
		)))),
	},
	{
		Strs: []string{"${ foo;}", "${\n\tfoo; }", "${\tfoo;}"},
		mksh: &CmdSubst{
			Stmts:    litStmts("foo"),
			TempFile: true,
		},
	},
	{
		Strs: []string{"${\n\tfoo\n\tbar\n}", "${ foo; bar;}"},
		mksh: &CmdSubst{
			Stmts:    litStmts("foo", "bar"),
			TempFile: true,
		},
	},
	{
		Strs: []string{"${|foo;}", "${| foo; }"},
		mksh: &CmdSubst{
			Stmts:    litStmts("foo"),
			ReplyVar: true,
		},
	},
	{
		Strs: []string{"${|\n\tfoo\n\tbar\n}", "${|foo; bar;}"},
		mksh: &CmdSubst{
			Stmts:    litStmts("foo", "bar"),
			ReplyVar: true,
		},
	},
	{
		Strs:   []string{`"$foo"`},
		common: dblQuoted(litParamExp("foo")),
	},
	{
		Strs:   []string{`"#foo"`},
		common: dblQuoted(lit("#foo")),
	},
	{
		Strs: []string{`$@a $*a $#a $$a $?a $!a $-a $0a $30a $_a`},
		common: call(
			word(litParamExp("@"), lit("a")),
			word(litParamExp("*"), lit("a")),
			word(litParamExp("#"), lit("a")),
			word(litParamExp("$"), lit("a")),
			word(litParamExp("?"), lit("a")),
			word(litParamExp("!"), lit("a")),
			word(litParamExp("-"), lit("a")),
			word(litParamExp("0"), lit("a")),
			word(litParamExp("3"), lit("0a")),
			word(litParamExp("_a")),
		),
	},
	{
		Strs:   []string{`$`, `$ #`},
		common: litWord("$"),
	},
	{
		Strs: []string{`${@} ${*} ${#} ${$} ${?} ${!} ${0} ${29} ${-}`},
		common: call(
			word(&ParamExp{Param: lit("@")}),
			word(&ParamExp{Param: lit("*")}),
			word(&ParamExp{Param: lit("#")}),
			word(&ParamExp{Param: lit("$")}),
			word(&ParamExp{Param: lit("?")}),
			word(&ParamExp{Param: lit("!")}),
			word(&ParamExp{Param: lit("0")}),
			word(&ParamExp{Param: lit("29")}),
			word(&ParamExp{Param: lit("-")}),
		),
	},
	{
		Strs: []string{`${#$} ${#@} ${#*} ${##}`},
		common: call(
			word(&ParamExp{Length: true, Param: lit("$")}),
			word(&ParamExp{Length: true, Param: lit("@")}),
			word(&ParamExp{Length: true, Param: lit("*")}),
			word(&ParamExp{Length: true, Param: lit("#")}),
		),
	},
	{
		Strs:   []string{`${foo}`},
		common: &ParamExp{Param: lit("foo")},
	},
	{
		Strs: []string{`${foo}"bar"`},
		common: word(
			&ParamExp{Param: lit("foo")},
			dblQuoted(lit("bar")),
		),
	},
	{
		Strs: []string{`$a/b $a-b $a:b $a}b $a]b $a.b $a,b $a*b $a_b $a2b`},
		common: call(
			word(litParamExp("a"), lit("/b")),
			word(litParamExp("a"), lit("-b")),
			word(litParamExp("a"), lit(":b")),
			word(litParamExp("a"), lit("}b")),
			word(litParamExp("a"), lit("]b")),
			word(litParamExp("a"), lit(".b")),
			word(litParamExp("a"), lit(",b")),
			word(litParamExp("a"), lit("*b")),
			word(litParamExp("a_b")),
			word(litParamExp("a2b")),
		),
	},
	{
		Strs: []string{`$aàb $àb $,b`},
		common: call(
			word(litParamExp("a"), lit("àb")),
			word(lit("$"), lit("àb")),
			word(lit("$"), lit(",b")),
		),
	},
	{
		Strs:   []string{"$à", "$\\\nà"},
		common: word(lit("$"), lit("à")),
	},
	{
		Strs: []string{"$foobar", "$foo\\\nbar"},
		common: call(
			word(litParamExp("foobar")),
		),
	},
	{
		Strs: []string{"$foo\\bar"},
		common: call(
			word(litParamExp("foo"), lit("\\bar")),
		),
	},
	{
		Strs: []string{`echo -e "$foo\nbar"`},
		common: call(
			litWord("echo"), litWord("-e"),
			word(dblQuoted(
				litParamExp("foo"), lit(`\nbar`),
			)),
		),
	},
	{
		Strs: []string{`${foo-bar}`},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op:   DefaultUnset,
				Word: litWord("bar"),
			},
		},
	},
	{
		Strs: []string{`${foo+}"bar"`},
		common: word(
			&ParamExp{
				Param: lit("foo"),
				Exp:   &Expansion{Op: AlternateUnset},
			},
			dblQuoted(lit("bar")),
		),
	},
	{
		Strs: []string{`${foo:=<"bar"}`},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op:   AssignUnsetOrNull,
				Word: word(lit("<"), dblQuoted(lit("bar"))),
			},
		},
	},
	{
		Strs: []string{
			"${foo:=b${c}$(d)}",
			"${foo:=b${c}`d`}",
		},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op: AssignUnsetOrNull,
				Word: word(
					lit("b"),
					&ParamExp{Param: lit("c")},
					cmdSubst(litStmt("d")),
				),
			},
		},
	},
	{
		Strs: []string{`${foo?"${bar}"}`},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op: ErrorUnset,
				Word: word(dblQuoted(
					&ParamExp{Param: lit("bar")},
				)),
			},
		},
	},
	{
		Strs: []string{`${foo:?bar1 bar2}`},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op:   ErrorUnsetOrNull,
				Word: litWord("bar1 bar2"),
			},
		},
	},
	{
		Strs: []string{`${a:+b}${a:-b}${a=b}`},
		common: word(
			&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   AlternateUnsetOrNull,
					Word: litWord("b"),
				},
			},
			&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   DefaultUnsetOrNull,
					Word: litWord("b"),
				},
			},
			&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   AssignUnset,
					Word: litWord("b"),
				},
			},
		),
	},
	{
		Strs: []string{`${3:-'$x'}`},
		common: &ParamExp{
			Param: lit("3"),
			Exp: &Expansion{
				Op:   DefaultUnsetOrNull,
				Word: word(sglQuoted("$x")),
			},
		},
	},
	{
		Strs: []string{`${@:-$x}`},
		common: &ParamExp{
			Param: lit("@"),
			Exp: &Expansion{
				Op:   DefaultUnsetOrNull,
				Word: word(litParamExp("x")),
			},
		},
	},
	{
		Strs: []string{`${var#*'="'}`},
		common: &ParamExp{
			Param: lit("var"),
			Exp: &Expansion{
				Op:   RemSmallPrefix,
				Word: word(lit("*"), sglQuoted(`="`)),
			},
		},
	},
	{
		Strs: []string{`${var/'a'/b'c'd}`},
		bsmk: &ParamExp{
			Param: lit("var"),
			Repl: &Replace{
				Orig: word(sglQuoted("a")),
				With: word(lit("b"), sglQuoted("c"), lit("d")),
			},
		},
	},
	{
		Strs: []string{`${foo%bar}${foo%%bar*}`},
		common: word(
			&ParamExp{
				Param: lit("foo"),
				Exp: &Expansion{
					Op:   RemSmallSuffix,
					Word: litWord("bar"),
				},
			},
			&ParamExp{
				Param: lit("foo"),
				Exp: &Expansion{
					Op:   RemLargeSuffix,
					Word: litWord("bar*"),
				},
			},
		),
	},
	{
		Strs: []string{`${3#bar}${-##bar*}`},
		common: word(
			&ParamExp{
				Param: lit("3"),
				Exp: &Expansion{
					Op:   RemSmallPrefix,
					Word: litWord("bar"),
				},
			},
			&ParamExp{
				Param: lit("-"),
				Exp: &Expansion{
					Op:   RemLargePrefix,
					Word: litWord("bar*"),
				},
			},
		),
	},
	{
		Strs: []string{`${foo%?}`},
		common: &ParamExp{
			Param: lit("foo"),
			Exp: &Expansion{
				Op:   RemSmallSuffix,
				Word: litWord("?"),
			},
		},
	},
	{
		Strs: []string{
			`${foo[1]}`,
			`${foo[ 1 ]}`,
		},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: litWord("1"),
		},
	},
	{
		Strs: []string{`${foo[-1]}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: &UnaryArithm{
				Op: Minus,
				X:  litWord("1"),
			},
		},
	},
	{
		Strs: []string{`${foo[@]}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: litWord("@"),
		},
	},
	{
		Strs: []string{`${foo[*]-etc}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: litWord("*"),
			Exp: &Expansion{
				Op:   DefaultUnset,
				Word: litWord("etc"),
			},
		},
	},
	{
		Strs: []string{`${foo[bar]}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: litWord("bar"),
		},
	},
	{
		Strs: []string{`${foo[$bar]}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: word(litParamExp("bar")),
		},
	},
	{
		Strs: []string{`${foo[${bar}]}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Index: word(&ParamExp{Param: lit("bar")}),
		},
	},
	{
		Strs: []string{`${foo:1}`, `${foo: 1 }`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{Offset: litWord("1")},
		},
	},
	{
		Strs: []string{`${foo:1:2}`, `${foo: 1 : 2 }`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: litWord("1"),
				Length: litWord("2"),
			},
		},
	},
	{
		Strs: []string{`${foo:a:b}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: litWord("a"),
				Length: litWord("b"),
			},
		},
	},
	{
		Strs: []string{`${foo:1:-2}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: litWord("1"),
				Length: &UnaryArithm{Op: Minus, X: litWord("2")},
			},
		},
	},
	{
		Strs: []string{`${foo::+3}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Length: &UnaryArithm{Op: Plus, X: litWord("3")},
			},
		},
	},
	{
		Strs: []string{`${foo: -1}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: &UnaryArithm{Op: Minus, X: litWord("1")},
			},
		},
	},
	{
		Strs: []string{`${foo: +2+3}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: &BinaryArithm{
					Op: Add,
					X:  &UnaryArithm{Op: Plus, X: litWord("2")},
					Y:  litWord("3"),
				},
			},
		},
	},
	{
		Strs: []string{`${foo:a?1:2:3}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Slice: &Slice{
				Offset: &BinaryArithm{
					Op: TernQuest,
					X:  litWord("a"),
					Y: &BinaryArithm{
						Op: TernColon,
						X:  litWord("1"),
						Y:  litWord("2"),
					},
				},
				Length: litWord("3"),
			},
		},
	},
	{
		Strs: []string{`${foo/a/b}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{Orig: litWord("a"), With: litWord("b")},
		},
	},
	{
		Strs: []string{"${foo/ /\t}"},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{Orig: litWord(" "), With: litWord("\t")},
		},
	},
	{
		Strs: []string{`${foo/[/]-}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{Orig: litWord("["), With: litWord("]-")},
		},
	},
	{
		Strs: []string{`${foo/bar/b/a/r}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl: &Replace{
				Orig: litWord("bar"),
				With: litWord("b/a/r"),
			},
		},
	},
	{
		Strs: []string{`${foo/$a/$'\''}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl: &Replace{
				Orig: word(litParamExp("a")),
				With: word(sglDQuoted(`\'`)),
			},
		},
	},
	{
		Strs: []string{`${foo//b1/b2}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl: &Replace{
				All:  true,
				Orig: litWord("b1"),
				With: litWord("b2"),
			},
		},
	},
	{
		Strs: []string{`${foo///}`, `${foo//}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{All: true},
		},
	},
	{
		Strs: []string{`${foo/-//}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{Orig: litWord("-"), With: litWord("/")},
		},
	},
	{
		Strs: []string{`${foo//#/}`, `${foo//#}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{All: true, Orig: litWord("#")},
		},
	},
	{
		Strs: []string{`${foo//[42]/}`},
		bsmk: &ParamExp{
			Param: lit("foo"),
			Repl:  &Replace{All: true, Orig: litWord("[42]")},
		},
	},
	{
		Strs: []string{`${a^b} ${a^^b} ${a,b} ${a,,b}`},
		bash: call(
			word(&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   UpperFirst,
					Word: litWord("b"),
				},
			}),
			word(&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   UpperAll,
					Word: litWord("b"),
				},
			}),
			word(&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   LowerFirst,
					Word: litWord("b"),
				},
			}),
			word(&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   LowerAll,
					Word: litWord("b"),
				},
			}),
		),
	},
	{
		Strs: []string{`${a@E} ${b@a} ${@@Q} ${!ref@P}`},
		bsmk: call(
			word(&ParamExp{
				Param: lit("a"),
				Exp: &Expansion{
					Op:   OtherParamOps,
					Word: litWord("E"),
				},
			}),
			word(&ParamExp{
				Param: lit("b"),
				Exp: &Expansion{
					Op:   OtherParamOps,
					Word: litWord("a"),
				},
			}),
			word(&ParamExp{
				Param: lit("@"),
				Exp: &Expansion{
					Op:   OtherParamOps,
					Word: litWord("Q"),
				},
			}),
			word(&ParamExp{
				Excl:  true,
				Param: lit("ref"),
				Exp: &Expansion{
					Op:   OtherParamOps,
					Word: litWord("P"),
				},
			}),
		),
	},
	{
		Strs: []string{`${#foo}`},
		common: &ParamExp{
			Length: true,
			Param:  lit("foo"),
		},
	},
	{
		Strs: []string{`${%foo}`},
		mksh: &ParamExp{
			Width: true,
			Param: lit("foo"),
		},
	},
	{
		Strs: []string{`${!foo} ${!bar[@]}`},
		bsmk: call(
			word(&ParamExp{
				Excl:  true,
				Param: lit("foo"),
			}),
			word(&ParamExp{
				Excl:  true,
				Param: lit("bar"),
				Index: litWord("@"),
			}),
		),
	},
	{
		Strs: []string{`${!foo*} ${!bar@}`},
		bsmk: call(
			word(&ParamExp{
				Excl:  true,
				Param: lit("foo"),
				Names: NamesPrefix,
			}),
			word(&ParamExp{
				Excl:  true,
				Param: lit("bar"),
				Names: NamesPrefixWords,
			}),
		),
	},
	{
		Strs: []string{`${#?}`},
		common: call(
			word(&ParamExp{Length: true, Param: lit("?")}),
		),
	},
	{
		Strs: []string{`${#-foo} ${#?bar}`},
		common: call(
			word(&ParamExp{
				Param: lit("#"),
				Exp: &Expansion{
					Op:   DefaultUnset,
					Word: litWord("foo"),
				},
			}),
			word(&ParamExp{
				Param: lit("#"),
				Exp: &Expansion{
					Op:   ErrorUnset,
					Word: litWord("bar"),
				},
			}),
		),
	},
	{
		Strs:   []string{`"${foo}"`},
		common: dblQuoted(&ParamExp{Param: lit("foo")}),
	},
	{
		Strs:   []string{`"(foo)"`},
		common: dblQuoted(lit("(foo)")),
	},
	{
		Strs: []string{`"${foo}>"`},
		common: dblQuoted(
			&ParamExp{Param: lit("foo")},
			lit(">"),
		),
	},
	{
		Strs:   []string{`"$(foo)"`, "\"`foo`\""},
		common: dblQuoted(cmdSubst(litStmt("foo"))),
	},
	{
		Strs: []string{
			`"$(foo bar)"`,
			`"$(foo  bar)"`,
			"\"`foo bar`\"",
			"\"`foo  bar`\"",
		},
		common: dblQuoted(cmdSubst(litStmt("foo", "bar"))),
	},
	{
		Strs:   []string{`'${foo}'`},
		common: sglQuoted("${foo}"),
	},
	{
		Strs:   []string{"$((1))"},
		common: arithmExp(litWord("1")),
	},
	{
		Strs: []string{"$((1 + 3))", "$((1+3))"},
		common: arithmExp(&BinaryArithm{
			Op: Add,
			X:  litWord("1"),
			Y:  litWord("3"),
		}),
	},
	{
		Strs: []string{`"$((foo))"`},
		common: dblQuoted(arithmExp(
			litWord("foo"),
		)),
	},
	{
		Strs: []string{`$((a)) b`},
		common: call(
			word(arithmExp(litWord("a"))),
			litWord("b"),
		),
	},
	{
		Strs: []string{`$((arr[0]++))`},
		bsmk: arithmExp(&UnaryArithm{
			Op: Inc, Post: true,
			X: word(&ParamExp{
				Short: true,
				Param: lit("arr"),
				Index: litWord("0"),
			}),
		}),
	},
	{
		Strs: []string{`$((++arr[0]))`},
		bsmk: arithmExp(&UnaryArithm{
			Op: Inc,
			X: word(&ParamExp{
				Short: true,
				Param: lit("arr"),
				Index: litWord("0"),
			}),
		}),
	},
	{
		Strs: []string{`$((${a:-1}))`},
		bsmk: arithmExp(word(&ParamExp{
			Param: lit("a"),
			Exp: &Expansion{
				Op:   DefaultUnsetOrNull,
				Word: litWord("1"),
			},
		})),
	},
	{
		Strs: []string{"$((5 * 2 - 1))", "$((5*2-1))"},
		common: arithmExp(&BinaryArithm{
			Op: Sub,
			X: &BinaryArithm{
				Op: Mul,
				X:  litWord("5"),
				Y:  litWord("2"),
			},
			Y: litWord("1"),
		}),
	},
	{
		Strs: []string{"$((i | 13))"},
		common: arithmExp(&BinaryArithm{
			Op: Or,
			X:  litWord("i"),
			Y:  litWord("13"),
		}),
	},
	{
		Strs: []string{
			"$(((a) + ((b))))",
			"$((\n(a) + \n(\n(b)\n)\n))",
		},
		common: arithmExp(&BinaryArithm{
			Op: Add,
			X:  parenArit(litWord("a")),
			Y:  parenArit(parenArit(litWord("b"))),
		}),
	},
	{
		Strs: []string{
			"$((3 % 7))",
			"$((3\n% 7))",
			"$((3\\\n % 7))",
		},
		common: arithmExp(&BinaryArithm{
			Op: Rem,
			X:  litWord("3"),
			Y:  litWord("7"),
		}),
	},
	{
		Strs: []string{`"$((1 / 3))"`},
		common: dblQuoted(arithmExp(&BinaryArithm{
			Op: Quo,
			X:  litWord("1"),
			Y:  litWord("3"),
		})),
	},
	{
		Strs: []string{"$((2 ** 10))"},
		common: arithmExp(&BinaryArithm{
			Op: Pow,
			X:  litWord("2"),
			Y:  litWord("10"),
		}),
	},
	{
		Strs: []string{`$(((1) ^ 3))`},
		common: arithmExp(&BinaryArithm{
			Op: Xor,
			X:  parenArit(litWord("1")),
			Y:  litWord("3"),
		}),
	},
	{
		Strs: []string{`$((1 >> (3 << 2)))`},
		common: arithmExp(&BinaryArithm{
			Op: Shr,
			X:  litWord("1"),
			Y: parenArit(&BinaryArithm{
				Op: Shl,
				X:  litWord("3"),
				Y:  litWord("2"),
			}),
		}),
	},
	{
		Strs: []string{`$((-(1)))`},
		common: arithmExp(&UnaryArithm{
			Op: Minus,
			X:  parenArit(litWord("1")),
		}),
	},
	{
		Strs: []string{`$((i++))`},
		common: arithmExp(&UnaryArithm{
			Op:   Inc,
			Post: true,
			X:    litWord("i"),
		}),
	},
	{
		Strs:   []string{`$((--i))`},
		common: arithmExp(&UnaryArithm{Op: Dec, X: litWord("i")}),
	},
	{
		Strs:   []string{`$((!i))`},
		common: arithmExp(&UnaryArithm{Op: Not, X: litWord("i")}),
	},
	{
		Strs:   []string{`$((~i))`},
		common: arithmExp(&UnaryArithm{Op: BitNegation, X: litWord("i")}),
	},
	{
		Strs: []string{`$((-!+i))`},
		common: arithmExp(&UnaryArithm{
			Op: Minus,
			X: &UnaryArithm{
				Op: Not,
				X:  &UnaryArithm{Op: Plus, X: litWord("i")},
			},
		}),
	},
	{
		Strs: []string{`$((!!i))`},
		common: arithmExp(&UnaryArithm{
			Op: Not,
			X:  &UnaryArithm{Op: Not, X: litWord("i")},
		}),
	},
	{
		Strs: []string{`$((~~i))`},
		common: arithmExp(&UnaryArithm{
			Op: BitNegation,
			X:  &UnaryArithm{Op: BitNegation, X: litWord("i")},
		}),
	},
	{
		Strs: []string{`$((1 < 3))`},
		common: arithmExp(&BinaryArithm{
			Op: Lss,
			X:  litWord("1"),
			Y:  litWord("3"),
		}),
	},
	{
		Strs: []string{`$((i = 2))`, `$((i=2))`},
		common: arithmExp(&BinaryArithm{
			Op: Assgn,
			X:  litWord("i"),
			Y:  litWord("2"),
		}),
	},
	{
		Strs: []string{`((a[i] = 4))`, `((a[i]=4))`},
		bsmk: arithmCmd(&BinaryArithm{
			Op: Assgn,
			X: word(&ParamExp{
				Short: true,
				Param: lit("a"),
				Index: litWord("i"),
			}),
			Y: litWord("4"),
		}),
	},
	{
		Strs: []string{"$((a += 2, b -= 3))"},
		common: arithmExp(&BinaryArithm{
			Op: Comma,
			X: &BinaryArithm{
				Op: AddAssgn,
				X:  litWord("a"),
				Y:  litWord("2"),
			},
			Y: &BinaryArithm{
				Op: SubAssgn,
				X:  litWord("b"),
				Y:  litWord("3"),
			},
		}),
	},
	{
		Strs: []string{"$((a >>= 2, b <<= 3))"},
		common: arithmExp(&BinaryArithm{
			Op: Comma,
			X: &BinaryArithm{
				Op: ShrAssgn,
				X:  litWord("a"),
				Y:  litWord("2"),
			},
			Y: &BinaryArithm{
				Op: ShlAssgn,
				X:  litWord("b"),
				Y:  litWord("3"),
			},
		}),
	},
	{
		Strs: []string{"$((a == b && c > d))"},
		common: arithmExp(&BinaryArithm{
			Op: AndArit,
			X: &BinaryArithm{
				Op: Eql,
				X:  litWord("a"),
				Y:  litWord("b"),
			},
			Y: &BinaryArithm{
				Op: Gtr,
				X:  litWord("c"),
				Y:  litWord("d"),
			},
		}),
	},
	{
		Strs: []string{"$((a != b))"},
		common: arithmExp(&BinaryArithm{
			Op: Neq,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((a &= b))"},
		common: arithmExp(&BinaryArithm{
			Op: AndAssgn,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((a |= b))"},
		common: arithmExp(&BinaryArithm{
			Op: OrAssgn,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((a %= b))"},
		common: arithmExp(&BinaryArithm{
			Op: RemAssgn,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((a /= b))", "$((a/=b))"},
		common: arithmExp(&BinaryArithm{
			Op: QuoAssgn,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((a ^= b))"},
		common: arithmExp(&BinaryArithm{
			Op: XorAssgn,
			X:  litWord("a"),
			Y:  litWord("b"),
		}),
	},
	{
		Strs: []string{"$((i *= 3))"},
		common: arithmExp(&BinaryArithm{
			Op: MulAssgn,
			X:  litWord("i"),
			Y:  litWord("3"),
		}),
	},
	{
		Strs: []string{"$((2 >= 10))"},
		common: arithmExp(&BinaryArithm{
			Op: Geq,
			X:  litWord("2"),
			Y:  litWord("10"),
		}),
	},
	{
		Strs: []string{"$((foo ? b1 : b2))"},
		common: arithmExp(&BinaryArithm{
			Op: TernQuest,
			X:  litWord("foo"),
			Y: &BinaryArithm{
				Op: TernColon,
				X:  litWord("b1"),
				Y:  litWord("b2"),
			},
		}),
	},
	{
		Strs: []string{`$((a <= (1 || 2)))`},
		common: arithmExp(&BinaryArithm{
			Op: Leq,
			X:  litWord("a"),
			Y: parenArit(&BinaryArithm{
				Op: OrArit,
				X:  litWord("1"),
				Y:  litWord("2"),
			}),
		}),
	},
	{
		Strs:   []string{"foo$", "foo$\n"},
		common: word(lit("foo"), lit("$")),
	},
	{
		Strs:   []string{"foo$", "foo$\\\n"},
		common: word(lit("foo"), lit("$")),
	},
	{
		Strs:  []string{`$''`},
		bsmk:  sglDQuoted(""),
		posix: word(lit("$"), sglQuoted("")),
	},
	{
		Strs:  []string{`$""`},
		bsmk:  dblDQuoted(),
		posix: word(lit("$"), dblQuoted()),
	},
	{
		Strs:  []string{`$'foo'`},
		bsmk:  sglDQuoted("foo"),
		posix: word(lit("$"), sglQuoted("foo")),
	},
	{
		Strs: []string{`$'f+oo${'`},
		bsmk: sglDQuoted("f+oo${"),
	},
	{
		Strs: []string{"$'foo bar`'"},
		bsmk: sglDQuoted("foo bar`"),
	},
	{
		Strs: []string{"$'a ${b} c'"},
		bsmk: sglDQuoted("a ${b} c"),
	},
	{
		Strs: []string{`$"a ${b} c"`},
		bsmk: dblDQuoted(
			lit("a "),
			&ParamExp{Param: lit("b")},
			lit(" c"),
		),
	},
	{
		Strs:   []string{`"a $b c"`},
		common: dblQuoted(lit("a "), litParamExp("b"), lit(" c")),
	},
	{
		Strs: []string{`$"a $b c"`},
		bsmk: dblDQuoted(
			lit("a "),
			litParamExp("b"),
			lit(" c"),
		),
	},
	{
		Strs: []string{"$'f\\'oo\n'"},
		bsmk: sglDQuoted("f\\'oo\n"),
	},
	{
		Strs:  []string{`$"foo"`},
		bsmk:  dblDQuoted(lit("foo")),
		posix: word(lit("$"), dblQuoted(lit("foo"))),
	},
	{
		Strs: []string{`$"foo$"`},
		bsmk: dblDQuoted(lit("foo"), lit("$")),
	},
	{
		Strs: []string{`$"foo bar"`},
		bsmk: dblDQuoted(lit("foo bar")),
	},
	{
		Strs: []string{`$'f\'oo'`},
		bsmk: sglDQuoted(`f\'oo`),
	},
	{
		Strs: []string{`$"f\"oo"`},
		bsmk: dblDQuoted(lit(`f\"oo`)),
	},
	{
		Strs:   []string{`"foo$"`},
		common: dblQuoted(lit("foo"), lit("$")),
	},
	{
		Strs:   []string{`"foo$$"`},
		common: dblQuoted(lit("foo"), litParamExp("$")),
	},
	{
		Strs:   []string{`"a $\"b\" c"`},
		common: dblQuoted(lit(`a `), lit(`$`), lit(`\"b\" c`)),
	},
	{
		Strs: []string{"$(foo$)", "`foo$`"},
		common: cmdSubst(
			stmt(call(word(lit("foo"), lit("$")))),
		),
	},
	{
		Strs:   []string{"foo$bar"},
		common: word(lit("foo"), litParamExp("bar")),
	},
	{
		Strs:   []string{"foo$(bar)"},
		common: word(lit("foo"), cmdSubst(litStmt("bar"))),
	},
	{
		Strs:   []string{"foo${bar}"},
		common: word(lit("foo"), &ParamExp{Param: lit("bar")}),
	},
	{
		Strs:   []string{"'foo${bar'"},
		common: sglQuoted("foo${bar"),
	},
	{
		Strs: []string{"(foo)\nbar", "(foo); bar"},
		common: []Command{
			subshell(litStmt("foo")),
			litCall("bar"),
		},
	},
	{
		Strs: []string{"foo\n(bar)", "foo; (bar)"},
		common: []Command{
			litCall("foo"),
			subshell(litStmt("bar")),
		},
	},
	{
		Strs: []string{"foo\n(bar)", "foo; (bar)"},
		common: []Command{
			litCall("foo"),
			subshell(litStmt("bar")),
		},
	},
	{
		Strs: []string{
			"case $i in 1) foo ;; 2 | 3*) bar ;; esac",
			"case $i in 1) foo;; 2 | 3*) bar; esac",
			"case $i in (1) foo;; 2 | 3*) bar;; esac",
			"case $i\nin\n#etc\n1)\nfoo\n;;\n2 | 3*)\nbar\n;;\nesac",
		},
		common: &CaseClause{
			Word: word(litParamExp("i")),
			Items: []*CaseItem{
				{
					Op:       Break,
					Patterns: litWords("1"),
					Stmts:    litStmts("foo"),
				},
				{
					Op:       Break,
					Patterns: litWords("2", "3*"),
					Stmts:    litStmts("bar"),
				},
			},
		},
	},
	{
		Strs: []string{"case i in 1) a ;& 2) ;; esac"},
		bsmk: &CaseClause{
			Word: litWord("i"),
			Items: []*CaseItem{
				{
					Op:       Fallthrough,
					Patterns: litWords("1"),
					Stmts:    litStmts("a"),
				},
				{Op: Break, Patterns: litWords("2")},
			},
		},
	},
	{
		Strs: []string{
			"case i in 1) a ;; esac",
			"case i { 1) a ;; }",
			"case i {\n1) a ;;\n}",
		},
		mksh: &CaseClause{
			Word: litWord("i"),
			Items: []*CaseItem{{
				Op:       Break,
				Patterns: litWords("1"),
				Stmts:    litStmts("a"),
			}},
		},
	},
	{
		Strs: []string{"case i in 1) a ;;& 2) b ;; esac"},
		bash: &CaseClause{
			Word: litWord("i"),
			Items: []*CaseItem{
				{
					Op:       Resume,
					Patterns: litWords("1"),
					Stmts:    litStmts("a"),
				},
				{
					Op:       Break,
					Patterns: litWords("2"),
					Stmts:    litStmts("b"),
				},
			},
		},
	},
	{
		Strs: []string{"case i in 1) a ;| 2) b ;; esac"},
		mksh: &CaseClause{
			Word: litWord("i"),
			Items: []*CaseItem{
				{
					Op:       ResumeKorn,
					Patterns: litWords("1"),
					Stmts:    litStmts("a"),
				},
				{
					Op:       Break,
					Patterns: litWords("2"),
					Stmts:    litStmts("b"),
				},
			},
		},
	},
	{
		Strs: []string{"case $i in 1) cat <<EOF ;;\nfoo\nEOF\nesac"},
		common: &CaseClause{
			Word: word(litParamExp("i")),
			Items: []*CaseItem{{
				Op:       Break,
				Patterns: litWords("1"),
				Stmts: []*Stmt{{
					Cmd: litCall("cat"),
					Redirs: []*Redirect{{
						Op:   Hdoc,
						Word: litWord("EOF"),
						Hdoc: litWord("foo\n"),
					}},
				}},
			}},
		},
	},
	{
		Strs: []string{"foo | while read a; do b; done"},
		common: &BinaryCmd{
			Op: Pipe,
			X:  litStmt("foo"),
			Y: stmt(&WhileClause{
				Cond: []*Stmt{litStmt("read", "a")},

Do: litStmts("b"),
			}),
		},
	},
	{
		Strs: []string{"while read l; do foo || bar; done"},
		common: &WhileClause{
			Cond: []*Stmt{litStmt("read", "l")},
			Do: stmts(&BinaryCmd{
				Op: OrStmt,
				X:  litStmt("foo"),
				Y:  litStmt("bar"),
			}),
		},
	},
	{
		Strs:   []string{"echo if while"},
		common: litCall("echo", "if", "while"),
	},
	{
		Strs:   []string{"${foo}if"},
		common: word(&ParamExp{Param: lit("foo")}, lit("if")),
	},
	{
		Strs:   []string{"$if'|'"},
		common: word(litParamExp("if"), sglQuoted("|")),
	},
	{
		Strs: []string{"if a; then b=; fi", "if a; then b=\nfi"},
		common: &IfClause{
			Cond: litStmts("a"),
			Then: stmts(&CallExpr{
				Assigns: []*Assign{
					{Name: lit("b")},
				},
			}),
		},
	},
	{
		Strs: []string{"if a; then >f; fi", "if a; then >f\nfi"},
		common: &IfClause{
			Cond: litStmts("a"),
			Then: []*Stmt{{
				Redirs: []*Redirect{
					{Op: RdrOut, Word: litWord("f")},
				},
			}},
		},
	},
	{
		Strs: []string{"if a; then (a); fi", "if a; then (a) fi"},
		common: &IfClause{
			Cond: litStmts("a"),
			Then: stmts(subshell(litStmt("a"))),
		},
	},
	{
		Strs: []string{"a=b\nc=d", "a=b; c=d"},
		common: []Command{
			&CallExpr{Assigns: []*Assign{
				{Name: lit("a"), Value: litWord("b")},
			}},
			&CallExpr{Assigns: []*Assign{
				{Name: lit("c"), Value: litWord("d")},
			}},
		},
	},
	{
		Strs: []string{"foo && write | read"},
		common: &BinaryCmd{
			Op: AndStmt,
			X:  litStmt("foo"),
			Y: stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("write"),
				Y:  litStmt("read"),
			}),
		},
	},
	{
		Strs: []string{"write | read && bar"},
		common: &BinaryCmd{
			Op: AndStmt,
			X: stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("write"),
				Y:  litStmt("read"),
			}),
			Y: litStmt("bar"),
		},
	},
	{
		Strs: []string{"foo >f | bar"},
		common: &BinaryCmd{
			Op: Pipe,
			X: &Stmt{
				Cmd: litCall("foo"),
				Redirs: []*Redirect{
					{Op: RdrOut, Word: litWord("f")},
				},
			},
			Y: litStmt("bar"),
		},
	},
	{
		Strs: []string{"(foo) >f | bar"},
		common: &BinaryCmd{
			Op: Pipe,
			X: &Stmt{
				Cmd: subshell(litStmt("foo")),
				Redirs: []*Redirect{
					{Op: RdrOut, Word: litWord("f")},
				},
			},
			Y: litStmt("bar"),
		},
	},
	{
		Strs: []string{"foo | >f"},
		common: &BinaryCmd{
			Op: Pipe,
			X:  litStmt("foo"),
			Y: &Stmt{Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("f")},
			}},
		},
	},
	{
		Strs:  []string{"[[ a ]]"},
		bsmk:  &TestClause{X: litWord("a")},
		posix: litStmt("[[", "a", "]]"),
	},
	{
		Strs: []string{"[[ a ]]\nb"},
		bsmk: stmts(
			&TestClause{X: litWord("a")},
			litCall("b"),
		),
	},
	{
		Strs: []string{"[[ a > b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: TsAfter,
			X:  litWord("a"),
			Y:  litWord("b"),
		}},
	},
	{
		Strs: []string{"[[ 1 -nt 2 ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: TsNewer,
			X:  litWord("1"),
			Y:  litWord("2"),
		}},
	},
	{
		Strs: []string{"[[ 1 -eq 2 ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: TsEql,
			X:  litWord("1"),
			Y:  litWord("2"),
		}},
	},
	{
		Strs: []string{
			"[[ -R a ]]",
			"[[\n-R a\n]]",
		},
		bash: &TestClause{X: &UnaryTest{
			Op: TsRefVar,
			X:  litWord("a"),
		}},
	},
	{
		Strs: []string{"[[ a =~ b ]]", "[[ a =~ b ]];"},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  litWord("b"),
		}},
	},
	{
		Strs: []string{`[[ a =~ " foo "$bar ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y: word(
				dblQuoted(lit(" foo ")),
				litParamExp("bar"),
			),
		}},
	},
	{
		Strs: []string{`[[ a =~ foo"bar" ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y: word(
				lit("foo"),
				dblQuoted(lit("bar")),
			),
		}},
	},
	{
		Strs: []string{`[[ a =~ [ab](c |d) ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  litWord("[ab](c |d)"),
		}},
	},
	{
		Strs: []string{`[[ a =~ ( ]]<>;&) ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  litWord("( ]]<>;&)"),
		}},
	},
	{
		Strs: []string{`[[ a =~ ($foo) ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  word(lit("("), litParamExp("foo"), lit(")")),
		}},
	},
	{
		Strs: []string{`[[ a =~ b\ c|d ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  litWord(`b\ c|d`),
		}},
	},
	{
		Strs: []string{`[[ a == -n ]]`},
		bsmk: &TestClause{X: &BinaryTest{
			Op: TsMatch,
			X:  litWord("a"),
			Y:  litWord("-n"),
		}},
	},
	{
		Strs: []string{`[[ a =~ -n ]]`},
		bash: &TestClause{X: &BinaryTest{
			Op: TsReMatch,
			X:  litWord("a"),
			Y:  litWord("-n"),
		}},
	},
	{
		Strs: []string{"[[ a =~ b$ || c =~ d$ ]]"},
		bash: &TestClause{X: &BinaryTest{
			Op: OrTest,
			X: &BinaryTest{
				Op: TsReMatch,
				X:  litWord("a"),
				Y:  word(lit("b"), lit("$")),
			},
			Y: &BinaryTest{
				Op: TsReMatch,
				X:  litWord("c"),
				Y:  word(lit("d"), lit("$")),
			},
		}},
	},
	{
		Strs: []string{"[[ -n $a ]]"},
		bsmk: &TestClause{
			X: &UnaryTest{Op: TsNempStr, X: word(litParamExp("a"))},
		},
	},
	{
		Strs: []string{"[[ ! $a < 'b' ]]"},
		bsmk: &TestClause{X: &UnaryTest{
			Op: TsNot,
			X: &BinaryTest{
				Op: TsBefore,
				X:  word(litParamExp("a")),
				Y:  word(sglQuoted("b")),
			},
		}},
	},
	{
		Strs: []string{
			"[[ ! -e $a ]]",
			"[[ ! -a $a ]]",
			"[[\n!\n-a $a\n]]",
		},
		bsmk: &TestClause{X: &UnaryTest{
			Op: TsNot,
			X:  &UnaryTest{Op: TsExists, X: word(litParamExp("a"))},
		}},
	},
	{
		Strs: []string{
			"[[ a && b ]]",
			"[[\na &&\nb ]]",
			"[[\n\na &&\n\nb ]]",
		},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  litWord("a"),
			Y:  litWord("b"),
		}},
	},
	{
		Strs: []string{"[[ (a && b) ]]"},
		bsmk: &TestClause{X: parenTest(&BinaryTest{
			Op: AndTest,
			X:  litWord("a"),
			Y:  litWord("b"),
		})},
	},
	{
		Strs: []string{
			"[[ a && (b) ]]",
			"[[ a &&\n(\nb) ]]",
		},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  litWord("a"),
			Y:  parenTest(litWord("b")),
		}},
	},
	{
		Strs: []string{"[[ (a && b) || -f c ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: OrTest,
			X: parenTest(&BinaryTest{
				Op: AndTest,
				X:  litWord("a"),
				Y:  litWord("b"),
			}),
			Y: &UnaryTest{Op: TsRegFile, X: litWord("c")},
		}},
	},
	{
		Strs: []string{
			"[[ -S a && -L b ]]",
			"[[ -S a && -h b ]]",
		},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsSocket, X: litWord("a")},
			Y:  &UnaryTest{Op: TsSmbLink, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -k a && -N b ]]"},
		bash: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsSticky, X: litWord("a")},
			Y:  &UnaryTest{Op: TsModif, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -G a && -O b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsGrpOwn, X: litWord("a")},
			Y:  &UnaryTest{Op: TsUsrOwn, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -d a && -c b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsDirect, X: litWord("a")},
			Y:  &UnaryTest{Op: TsCharSp, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -b a && -p b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsBlckSp, X: litWord("a")},
			Y:  &UnaryTest{Op: TsNmPipe, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -g a && -u b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsGIDSet, X: litWord("a")},
			Y:  &UnaryTest{Op: TsUIDSet, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -r a && -w b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsRead, X: litWord("a")},
			Y:  &UnaryTest{Op: TsWrite, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -x a && -s b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsExec, X: litWord("a")},
			Y:  &UnaryTest{Op: TsNoEmpty, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -t a && -z b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsFdTerm, X: litWord("a")},
			Y:  &UnaryTest{Op: TsEmpStr, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ -o a && -v b ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X:  &UnaryTest{Op: TsOptSet, X: litWord("a")},
			Y:  &UnaryTest{Op: TsVarSet, X: litWord("b")},
		}},
	},
	{
		Strs: []string{"[[ a -ot b && c -ef d ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X: &BinaryTest{
				Op: TsOlder,
				X:  litWord("a"),
				Y:  litWord("b"),
			},
			Y: &BinaryTest{
				Op: TsDevIno,
				X:  litWord("c"),
				Y:  litWord("d"),
			},
		}},
	},
	{
		Strs: []string{"[[ a = b && c != d ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X: &BinaryTest{
				Op: TsMatchShort,
				X:  litWord("a"),
				Y:  litWord("b"),
			},
			Y: &BinaryTest{
				Op: TsNoMatch,
				X:  litWord("c"),
				Y:  litWord("d"),
			},
		}},
	},
	{
		Strs: []string{"[[ a -ne b && c -le d ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X: &BinaryTest{
				Op: TsNeq,
				X:  litWord("a"),
				Y:  litWord("b"),
			},
			Y: &BinaryTest{
				Op: TsLeq,
				X:  litWord("c"),
				Y:  litWord("d"),
			},
		}},
	},
	{
		Strs: []string{"[[ c -ge d ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: TsGeq,
			X:  litWord("c"),
			Y:  litWord("d"),
		}},
	},
	{
		Strs: []string{"[[ a -lt b && c -gt d ]]"},
		bsmk: &TestClause{X: &BinaryTest{
			Op: AndTest,
			X: &BinaryTest{
				Op: TsLss,
				X:  litWord("a"),
				Y:  litWord("b"),
			},
			Y: &BinaryTest{
				Op: TsGtr,
				X:  litWord("c"),
				Y:  litWord("d"),
			},
		}},
	},
	{
		Strs:   []string{"declare -f func"},
		common: litStmt("declare", "-f", "func"),
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{
				{Naked: true, Value: litWord("-f")},
				{Naked: true, Name: lit("func")},
			},
		},
	},
	{
		Strs: []string{"(local bar)"},
		bsmk: subshell(stmt(&DeclClause{
			Variant: lit("local"),
			Args: []*Assign{{
				Naked: true,
				Name:  lit("bar"),
			}},
		})),
		posix: subshell(litStmt("local", "bar")),
	},
	{
		Strs:  []string{"typeset"},
		bsmk:  &DeclClause{Variant: lit("typeset")},
		posix: litStmt("typeset"),
	},
	{
		Strs: []string{"export bar"},
		bsmk: &DeclClause{
			Variant: lit("export"),
			Args: []*Assign{{
				Naked: true,
				Name:  lit("bar"),
			}},
		},
		posix: litStmt("export", "bar"),
	},
	{
		Strs: []string{"readonly -n"},
		bsmk: &DeclClause{
			Variant: lit("readonly"),
			Args:    []*Assign{{Naked: true, Value: litWord("-n")}},
		},
		posix: litStmt("readonly", "-n"),
	},
	{
		Strs: []string{"nameref bar="},
		bsmk: &DeclClause{
			Variant: lit("nameref"),
			Args: []*Assign{{
				Name: lit("bar"),
			}},
		},
		posix: litStmt("nameref", "bar="),
	},
	{
		Strs: []string{"declare -a +n -b$o foo=bar"},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{
				{Naked: true, Value: litWord("-a")},
				{Naked: true, Value: litWord("+n")},
				{Naked: true, Value: word(lit("-b"), litParamExp("o"))},
				{Name: lit("foo"), Value: litWord("bar")},
			},
		},
	},
	{
		Strs: []string{
			"declare -a foo=(b1 $(b2))",
			"declare -a foo=(b1 `b2`)",
		},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{
				{Naked: true, Value: litWord("-a")},
				{
					Name: lit("foo"),
					Array: arrValues(
						litWord("b1"),
						word(cmdSubst(litStmt("b2"))),
					),
				},
			},
		},
	},
	{
		Strs: []string{"local -a foo=(b1)"},
		bash: &DeclClause{
			Variant: lit("local"),
			Args: []*Assign{
				{Naked: true, Value: litWord("-a")},
				{
					Name:  lit("foo"),
					Array: arrValues(litWord("b1")),
				},
			},
		},
	},
	{
		Strs: []string{"declare -A foo=([a]=b)"},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{
				{Naked: true, Value: litWord("-A")},
				{
					Name: lit("foo"),
					Array: &ArrayExpr{Elems: []*ArrayElem{{
						Index: litWord("a"),
						Value: litWord("b"),
					}}},
				},
			},
		},
	},
	{
		Strs: []string{"declare foo[a]="},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{{
				Name:  lit("foo"),
				Index: litWord("a"),
			}},
		},
	},
	{
		Strs: []string{"declare foo[*]"},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{{
				Name:  lit("foo"),
				Index: litWord("*"),
				Naked: true,
			}},
		},
	},
	{
		Strs: []string{`declare foo["x y"]`},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{{
				Name:  lit("foo"),
				Index: word(dblQuoted(lit("x y"))),
				Naked: true,
			}},
		},
	},
	{
		Strs: []string{`declare foo['x y']`},
		bash: &DeclClause{
			Variant: lit("declare"),
			Args: []*Assign{{
				Name:  lit("foo"),
				Index: word(sglQuoted("x y")),
				Naked: true,
			}},
		},
	},
	{
		Strs: []string{"foo=([)"},
		mksh: &CallExpr{Assigns: []*Assign{{
			Name:  lit("foo"),
			Array: arrValues(litWord("[")),
		}}},
	},
	{
		Strs: []string{
			"a && b=(c)\nd",
			"a && b=(c); d",
		},
		bsmk: stmts(
			&BinaryCmd{
				Op: AndStmt,
				X:  litStmt("a"),
				Y: stmt(&CallExpr{Assigns: []*Assign{{
					Name:  lit("b"),
					Array: arrValues(litWord("c")),
				}}}),
			},
			litCall("d"),
		),
	},
	{
		Strs: []string{"declare -f $func >/dev/null"},
		bash: &Stmt{
			Cmd: &DeclClause{
				Variant: lit("declare"),
				Args: []*Assign{
					{Naked: true, Value: litWord("-f")},
					{
						Naked: true,
						Value: word(litParamExp("func")),
					},
				},
			},
			Redirs: []*Redirect{
				{Op: RdrOut, Word: litWord("/dev/null")},
			},
		},
	},
	{
		Strs: []string{"declare a\n{ x; }"},
		bash: stmts(
			&DeclClause{
				Variant: lit("declare"),
				Args: []*Assign{{
					Naked: true,
					Name:  lit("a"),
				}},
			},
			block(litStmt("x")),
		),
	},
	{
		Strs:   []string{"eval a=b foo"},
		common: litStmt("eval", "a=b", "foo"),
	},
	{
		Strs:  []string{"time", "time\n"},
		posix: litStmt("time"),
		bsmk:  &TimeClause{},
	},
	{
		Strs:  []string{"time -p"},
		posix: litStmt("time", "-p"),
		bsmk:  &TimeClause{PosixFormat: true},
	},
	{
		Strs:  []string{"time -a"},
		posix: litStmt("time", "-a"),
		bsmk:  &TimeClause{Stmt: litStmt("-a")},
	},
	{
		Strs:  []string{"time --"},
		posix: litStmt("time", "--"),
		bsmk:  &TimeClause{Stmt: litStmt("--")},
	},
	{
		Strs: []string{"time foo"},
		bsmk: &TimeClause{Stmt: litStmt("foo")},
	},
	{
		Strs: []string{"time { foo; }"},
		bsmk: &TimeClause{Stmt: stmt(block(litStmt("foo")))},
	},
	{
		Strs: []string{"time\nfoo"},
		bsmk: []*Stmt{
			stmt(&TimeClause{}),
			litStmt("foo"),
		},
	},
	{
		Strs:   []string{"coproc foo bar"},
		common: litStmt("coproc", "foo", "bar"),
		bash:   &CoprocClause{Stmt: litStmt("foo", "bar")},
	},
	{
		Strs: []string{"coproc name { foo; }"},
		bash: &CoprocClause{
			Name: litWord("name"),
			Stmt: stmt(block(litStmt("foo"))),
		},
	},
	{
		Strs: []string{"coproc $namevar { foo; }"},
		bash: &CoprocClause{
			Name: word(litParamExp("namevar")),
			Stmt: stmt(block(litStmt("foo"))),
		},
	},
	{
		Strs: []string{"coproc foo", "coproc foo;"},
		bash: &CoprocClause{Stmt: litStmt("foo")},
	},
	{
		Strs: []string{"coproc { foo; }"},
		bash: &CoprocClause{
			Stmt: stmt(block(litStmt("foo"))),
		},
	},
	{
		Strs: []string{"coproc (foo)"},
		bash: &CoprocClause{
			Stmt: stmt(subshell(litStmt("foo"))),
		},
	},
	{
		Strs: []string{"coproc name foo | bar"},
		bash: &CoprocClause{
			Name: litWord("name"),
			Stmt: stmt(&BinaryCmd{
				Op: Pipe,
				X:  litStmt("foo"),
				Y:  litStmt("bar"),
			}),
		},
	},
	{
		Strs: []string{"coproc $()", "coproc ``"},
		bash: &CoprocClause{Stmt: stmt(call(
			word(cmdSubst()),
		))},
	},
	{
		Strs: []string{`let i++`},
		bsmk: letClause(
			&UnaryArithm{Op: Inc, Post: true, X: litWord("i")},
		),
		posix: litStmt("let", "i++"),
	},
	{
		Strs: []string{`let a++ b++ c +d`},
		bsmk: letClause(
			&UnaryArithm{Op: Inc, Post: true, X: litWord("a")},
			&UnaryArithm{Op: Inc, Post: true, X: litWord("b")},
			litWord("c"),
			&UnaryArithm{Op: Plus, X: litWord("d")},
		),
	},
	{
		Strs: []string{`let ++i >/dev/null`},
		bsmk: &Stmt{
			Cmd:    letClause(&UnaryArithm{Op: Inc, X: litWord("i")}),
			Redirs: []*Redirect{{Op: RdrOut, Word: litWord("/dev/null")}},
		},
	},
	{
		Strs: []string{
			`let a=(1 + 2) b=3+4`,
			`let a=(1+2) b=3+4`,
		},
		bash: letClause(
			&BinaryArithm{
				Op: Assgn,
				X:  litWord("a"),
				Y: parenArit(&BinaryArithm{
					Op: Add,
					X:  litWord("1"),
					Y:  litWord("2"),
				}),
			},
			&BinaryArithm{
				Op: Assgn,
				X:  litWord("b"),
				Y: &BinaryArithm{
					Op: Add,
					X:  litWord("3"),
					Y:  litWord("4"),
				},
			},
		),
	},
	{
		Strs: []string{
			`let a=$(echo 3)`,
			"let a=`echo 3`",
		},
		bash: letClause(
			&BinaryArithm{
				Op: Assgn,
				X:  litWord("a"),
				Y:  word(cmdSubst(litStmt("echo", "3"))),
			},
		),
	},
	{
		Strs:   []string{"(foo-bar)"},
		common: subshell(litStmt("foo-bar")),
	},
	{
		Strs: []string{
			"let i++\nbar",
			"let i++ \nbar",
			"let i++; bar",
		},
		bsmk: stmts(
			letClause(&UnaryArithm{
				Op:   Inc,
				Post: true,
				X:    litWord("i"),
			}),
			litCall("bar"),
		),
	},
	{
		Strs: []string{
			"let i++\nfoo=(bar)",
			"let i++; foo=(bar)",
			"let i++; foo=(bar)\n",
		},
		bsmk: stmts(
			letClause(&UnaryArithm{
				Op:   Inc,
				Post: true,
				X:    litWord("i"),
			}),
			&CallExpr{Assigns: []*Assign{{
				Name:  lit("foo"),
				Array: arrValues(litWord("bar")),
			}}},
		),
	},
	{
		Strs: []string{
			"case a in b) let i++ ;; esac",
			"case a in b) let i++;; esac",
		},
		bsmk: &CaseClause{
			Word: word(lit("a")),
			Items: []*CaseItem{{
				Op:       Break,
				Patterns: litWords("b"),
				Stmts: stmts(letClause(&UnaryArithm{
					Op:   Inc,
					Post: true,
					X:    litWord("i"),
				})),
			}},
		},
	},
	{
		Strs: []string{"a+=1"},
		bsmk: &CallExpr{
			Assigns: []*Assign{{
				Append: true,
				Name:   lit("a"),
				Value:  litWord("1"),
			}},
		},
		posix: litStmt("a+=1"),
	},
	{
		Strs: []string{"b+=(2 3)"},
		bsmk: &CallExpr{Assigns: []*Assign{{
			Append: true,
			Name:   lit("b"),
			Array:  arrValues(litWords("2", "3")...),
		}}},
	},
	{
		Strs:  []string{"a[2]=b c[-3]= d[x]+=e"},
		posix: litStmt("a[2]=b", "c[-3]=", "d[x]+=e"),
		bsmk: &CallExpr{Assigns: []*Assign{
			{
				Name:  lit("a"),
				Index: litWord("2"),
				Value: litWord("b"),
			},
			{
				Name: lit("c"),
				Index: &UnaryArithm{
					Op: Minus,
					X:  litWord("3"),
				},
			},
			{
				Name:   lit("d"),
				Index:  litWord("x"),
				Append: true,
				Value:  litWord("e"),
			},
		}},
	},
	{
		Strs:   []string{"*[i]=x"},
		posix:  lit("*[i]=x"),
		common: word(lit("*"), lit("[i]=x")),
	},
	{
		Strs: []string{
			"b[i]+=2",
			"b[ i ]+=2",
		},
		bsmk: &CallExpr{Assigns: []*Assign{{
			Append: true,
			Name:   lit("b"),
			Index:  litWord("i"),
			Value:  litWord("2"),
		}}},
	},
	{
		Strs: []string{`$((a + "b + $c"))`},
		common: arithmExp(&BinaryArithm{
			Op: Add,
			X:  litWord("a"),
			Y: word(dblQuoted(
				lit("b + "),
				litParamExp("c"),
			)),
		}),
	},
	{
		Strs: []string{`let 'i++'`},
		bsmk: letClause(word(sglQuoted("i++"))),
	},
	{
		Strs: []string{`echo ${a["x y"]}`},
		bash: call(litWord("echo"), word(&ParamExp{
			Param: lit("a"),
			Index: word(dblQuoted(lit("x y"))),
		})),
	},
	{
		Strs: []string{
			`a[$"x y"]=b`,
			`a[ $"x y" ]=b`,
		},
		bash: &CallExpr{Assigns: []*Assign{{
			Name: lit("a"),
			Index: word(&DblQuoted{Dollar: true, Parts: []WordPart{
				lit("x y"),
			}}),
			Value: litWord("b"),
		}}},
	},
	{
		Strs: []string{`((a["x y"] = b))`, `((a["x y"]=b))`},
		bsmk: arithmCmd(&BinaryArithm{
			Op: Assgn,
			X: word(&ParamExp{
				Short: true,
				Param: lit("a"),
				Index: word(dblQuoted(lit("x y"))),
			}),
			Y: litWord("b"),
		}),
	},
	{
		Strs: []string{
			`a=(["x y"]=b)`,
			`a=( [ "x y" ]=b)`,
		},
		bash: &CallExpr{Assigns: []*Assign{{
			Name: lit("a"),
			Array: &ArrayExpr{Elems: []*ArrayElem{{
				Index: word(dblQuoted(lit("x y"))),
				Value: litWord("b"),
			}}},
		}}},
	},
	{
		Strs: []string{
			"a=([x]= [y]=)",
			"a=(\n[x]=\n[y]=\n)",
		},
		bash: &CallExpr{Assigns: []*Assign{{
			Name: lit("a"),
			Array: &ArrayExpr{Elems: []*ArrayElem{
				{Index: litWord("x")},
				{Index: litWord("y")},
			}},
		}}},
	},
	{
		Strs:   []string{"a]b"},
		common: litStmt("a]b"),
	},
	{
		Strs:  []string{"echo a[b c[de]f"},
		posix: litStmt("echo", "a[b", "c[de]f"),
		bsmk: call(litWord("echo"),
			word(lit("a"), lit("[b")),
			word(lit("c"), lit("[de]f")),
		),
	},
	{
		Strs: []string{"<<EOF | b\nfoo\nEOF"},
		common: &BinaryCmd{
			Op: Pipe,
			X: &Stmt{Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("foo\n"),
			}}},
			Y: litStmt("b"),
		},
	},
	{
		Strs: []string{"<<EOF1 <<EOF2 | c && d\nEOF1\nEOF2"},
		common: &BinaryCmd{
			Op: AndStmt,
			X: stmt(&BinaryCmd{
				Op: Pipe,
				X: &Stmt{Redirs: []*Redirect{
					{Op: Hdoc, Word: litWord("EOF1")},
					{Op: Hdoc, Word: litWord("EOF2")},
				}},
				Y: litStmt("c"),
			}),
			Y: litStmt("d"),
		},
	},
	{
		Strs: []string{
			"<<EOF && { bar; }\nhdoc\nEOF",
			"<<EOF &&\nhdoc\nEOF\n{ bar; }",
		},
		common: &BinaryCmd{
			Op: AndStmt,
			X: &Stmt{Redirs: []*Redirect{{
				Op:   Hdoc,
				Word: litWord("EOF"),
				Hdoc: litWord("hdoc\n"),
			}}},
			Y: stmt(block(litStmt("bar"))),
		},
	},
	{
		Strs: []string{"foo() {\n\t<<EOF && { bar; }\nhdoc\nEOF\n}"},
		common: &FuncDecl{
			Parens: true,
			Name:   lit("foo"),
			Body: stmt(block(stmt(&BinaryCmd{
				Op: AndStmt,
				X: &Stmt{Redirs: []*Redirect{{
					Op:   Hdoc,
					Word: litWord("EOF"),
					Hdoc: litWord("hdoc\n"),
				}}},
				Y: stmt(block(litStmt("bar"))),
			}))),
		},
	},
	{
		Strs: []string{`"a$("")"`, "\"a`\"\"`\""},
		common: dblQuoted(
			lit("a"),
			cmdSubst(stmt(call(
				word(dblQuoted()),
			))),
		),
	},
	{
		Strs: []string{"echo ?(b)*(c)+(d)@(e)!(f)"},
		bsmk: call(litWord("echo"), word(
			&ExtGlob{Op: GlobZeroOrOne, Pattern: lit("b")},
			&ExtGlob{Op: GlobZeroOrMore, Pattern: lit("c")},
			&ExtGlob{Op: GlobOneOrMore, Pattern: lit("d")},
			&ExtGlob{Op: GlobOne, Pattern: lit("e")},
			&ExtGlob{Op: GlobExcept, Pattern: lit("f")},
		)),
	},
	{
		Strs: []string{"echo foo@(b*(c|d))bar"},
		bsmk: call(litWord("echo"), word(
			lit("foo"),
			&ExtGlob{Op: GlobOne, Pattern: lit("b*(c|d)")},
			lit("bar"),
		)),
	},
	{
		Strs: []string{"echo $a@(b)$c?(d)$e*(f)$g+(h)$i!(j)$k"},
		bsmk: call(litWord("echo"), word(
			litParamExp("a"),
			&ExtGlob{Op: GlobOne, Pattern: lit("b")},
			litParamExp("c"),
			&ExtGlob{Op: GlobZeroOrOne, Pattern: lit("d")},
			litParamExp("e"),
			&ExtGlob{Op: GlobZeroOrMore, Pattern: lit("f")},
			litParamExp("g"),
			&ExtGlob{Op: GlobOneOrMore, Pattern: lit("h")},
			litParamExp("i"),
			&ExtGlob{Op: GlobExcept, Pattern: lit("j")},
			litParamExp("k"),
		)),
	},
	{
		Strs: []string{"@test \"desc\" { body; }"},
		bats: &TestDecl{
			Description: word(dblQuoted(lit("desc"))),
			Body:        stmt(block(litStmt("body"))),
		},
	},
	{
		Strs: []string{"@test 'desc' {\n\tmultiple\n\tstatements\n}"},
		bats: &TestDecl{
			Description: word(sglQuoted("desc")),
			Body:        stmt(block(litStmts("multiple", "statements")...)),
		},
	},
}

// these don't have a canonical format with the same syntax tree
var fileTestsNoPrint = []testCase{
	{
		Strs:  []string{`$[foo]`},
		posix: word(lit("$"), lit("[foo]")),
	},
	{
		Strs:  []string{`"$[foo]"`},
		posix: dblQuoted(lit("$"), lit("[foo]")),
	},
	{
		Strs: []string{`"$[1 + 3]"`},
		bash: dblQuoted(arithmExpBr(&BinaryArithm{
			Op: Add,
			X:  litWord("1"),
			Y:  litWord("3"),
		})),
	},
}

func fullProg(v interface{}) *File {
	f := &File{}
	switch x := v.(type) {
	case *File:
		return x
	case []*Stmt:
		f.Stmts = x
		return f
	case *Stmt:
		f.Stmts = append(f.Stmts, x)
		return f
	case []Command:
		for _, cmd := range x {
			f.Stmts = append(f.Stmts, stmt(cmd))
		}
		return f
	case *Word:
		return fullProg(call(x))
	case WordPart:
		return fullProg(word(x))
	case Command:
		return fullProg(stmt(x))
	case nil:
	default:
		panic(reflect.TypeOf(v))
	}
	return nil
}

func clearPosRecurse(tb testing.TB, src string, v interface{}) {
	zeroPos := Pos{}
	checkSrc := func(pos Pos, strs ...string) {
		if src == "" {
			return
		}
		offs := pos.Offset()
		if offs > uint(len(src)) {
			tb.Fatalf("Pos %d in %T is out of bounds in %q",
				pos, v, src)
			return
		}
		if strs == nil {
			return
		}
		if strings.Contains(src, "<<-") {
			// since the tab indentation in <<- heredoc bodies
			// aren't part of the final literals
			return
		}
		var gotErr string
		for i, want := range strs {
			got := src[offs:]
			if i == 0 {
				gotErr = got
			}
			got = strings.Replace(got, "\\\n", "", -1)
			if strings.HasPrefix(got, want) {
				return
			}
		}
		tb.Fatalf("Expected one of %q at %d in %q, found %q",
			strs, pos, src, gotErr)
	}
	setPos := func(p *Pos, strs ...string) {
		checkSrc(*p, strs...)
		if *p == zeroPos {
			tb.Fatalf("Pos in %T is already %v", v, zeroPos)
		}
		*p = zeroPos
	}
	checkPos := func(n Node) {
		if n == nil {
			return
		}
		if n.Pos() != zeroPos {
			tb.Fatalf("Found unexpected Pos() in %T: want %d, got %d",
				n, zeroPos, n.Pos())
		}
		if n.Pos().After(n.End()) {
			tb.Fatalf("Found End() before Pos() in %T", n)
		}
	}
	recurse := func(v interface{}) {
		clearPosRecurse(tb, src, v)
		if n, ok := v.(Node); ok {
			checkPos(n)
		}
	}
	switch x := v.(type) {
	case *File:
		recurse(x.Stmts)
		recurse(x.Last)
		checkPos(x)
	case []*Stmt:
		for _, s := range x {
			recurse(s)
		}
	case []Comment:
		for i := range x {
			recurse(&x[i])
		}
	case *Comment:
		setPos(&x.Hash, "#"+x.Text)
	case *Stmt:
		endOff := int(x.End().Offset())
		if endOff < len(src) {
			end := src[endOff]
			switch {
			case end == ' ', end == '\n', end == '\t', end == '\r':
				// ended by whitespace
			case regOps(rune(end)):
				// ended by end character
			case endOff > 0 && src[endOff-1] == ';':
				// ended by semicolon
			case endOff > 0 && src[endOff-1] == '&':
				// ended by & or |&
			default:
				tb.Fatalf("Unexpected Stmt.End() %d %q in %q",
					endOff, end, src)
			}
		}
		recurse(x.Comments)
		if src[x.Position.Offset()] == '#' {
			tb.Fatalf("Stmt.Pos() should not be a comment")
		}
		setPos(&x.Position)
		if x.Semicolon.IsValid() {
			setPos(&x.Semicolon, ";", "&", "|&")
		}
		if x.Cmd != nil {
			recurse(x.Cmd)
		}
		for _, r := range x.Redirs {
			setPos(&r.OpPos, r.Op.String())
			if r.N != nil {
				recurse(r.N)
			}
			recurse(r.Word)
			if r.Hdoc != nil {
				recurse(r.Hdoc)
			}
		}
	case []*Assign:
		for _, a := range x {
			if a.Name != nil {
				recurse(a.Name)
			}
			if a.Index != nil {
				recurse(a.Index)
			}
			if a.Value != nil {
				recurse(a.Value)
			}
			if a.Array != nil {
				recurse(a.Array)
			}
			checkPos(a)
		}
	case *CallExpr:
		recurse(x.Assigns)
		recurse(x.Args)
	case []*Word:
		for _, w := range x {
			recurse(w)
		}
	case *Word:
		recurse(x.Parts)
	case []WordPart:
		for _, wp := range x {
			recurse(wp)
		}
	case *Lit:
		pos, end := int(x.Pos().Offset()), int(x.End().Offset())
		want := pos + len(x.Value)
		val := x.Value
		posLine := x.Pos().Line()
		endLine := x.End().Line()
		switch {
		case src == "":
		case strings.Contains(src, "\\\n"):
		case !strings.Contains(x.Value, "\n") && posLine != endLine:
			tb.Fatalf("Lit without newlines has Pos/End lines %d and %d",
				posLine, endLine)
		case strings.Contains(src, "`") && strings.Contains(src, "\\"):
			// removed quotes inside backquote cmd substs
			val = ""
		case end < len(src) && src[end] == '\n':
			// heredoc literals that end with the
			// stop word and a newline
		case end == len(src):
			// same as above, but with word and EOF
		case end != want:
			tb.Fatalf("Unexpected Lit %q End() %d (wanted %d) in %q",
				val, end, want, src)
		}
		setPos(&x.ValuePos, val)
		setPos(&x.ValueEnd)
	case *Subshell:
		setPos(&x.Lparen, "(")
		setPos(&x.Rparen, ")")
		recurse(x.Stmts)
		recurse(x.Last)
	case *Block:
		setPos(&x.Lbrace, "{")
		setPos(&x.Rbrace, "}")
		recurse(x.Stmts)
		recurse(x.Last)
	case *IfClause:
		if x.ThenPos.IsValid() {
			setPos(&x.Position, "if", "elif")
			setPos(&x.ThenPos, "then")
		} else {
			setPos(&x.Position, "else")
		}
		setPos(&x.FiPos, "fi")
		recurse(x.Cond)
		recurse(x.CondLast)
		recurse(x.Then)
		recurse(x.ThenLast)
		if x.Else != nil {
			recurse(x.Else)
		}
	case *WhileClause:
		rsrv := "while"
		if x.Until {
			rsrv = "until"
		}
		setPos(&x.WhilePos, rsrv)
		setPos(&x.DoPos, "do")
		setPos(&x.DonePos, "done")
		recurse(x.Cond)
		recurse(x.CondLast)
		recurse(x.Do)
		recurse(x.DoLast)
	case *ForClause:
		if x.Select {
			setPos(&x.ForPos, "select")
		} else {
			setPos(&x.ForPos, "for")
		}
		if x.Braces {
			setPos(&x.DoPos, "{")
			setPos(&x.DonePos, "}")
			// Zero out Braces, to not duplicate all the test cases.
			// The printer ignores the field anyway.
			x.Braces = false
		} else {
			setPos(&x.DoPos, "do")
			setPos(&x.DonePos, "done")
		}
		recurse(x.Loop)
		recurse(x.Do)
		recurse(x.DoLast)
	case *WordIter:
		recurse(x.Name)
		if x.InPos.IsValid() {
			setPos(&x.InPos, "in")
		}
		recurse(x.Items)
	case *CStyleLoop:
		setPos(&x.Lparen, "((")
		setPos(&x.Rparen, "))")
		if x.Init != nil {
			recurse(x.Init)
		}
		if x.Cond != nil {
			recurse(x.Cond)
		}
		if x.Post != nil {
			recurse(x.Post)
		}
	case *SglQuoted:
		checkSrc(posAddCol(x.End(), -1), "'")
		valuePos := posAddCol(x.Left, 1)
		if x.Dollar {
			valuePos = posAddCol(valuePos, 1)
		}
		checkSrc(valuePos, x.Value)
		if x.Dollar {
			setPos(&x.Left, "$'")
		} else {
			setPos(&x.Left, "'")
		}
		setPos(&x.Right, "'")
	case *DblQuoted:
		checkSrc(posAddCol(x.End(), -1), `"`)
		if x.Dollar {
			setPos(&x.Left, `$"`)
		} else {
			setPos(&x.Left, `"`)
		}
		setPos(&x.Right, `"`)
		recurse(x.Parts)
	case *UnaryArithm:
		setPos(&x.OpPos, x.Op.String())
		recurse(x.X)
	case *UnaryTest:
		strs := []string{x.Op.String()}
		switch x.Op {
		case TsExists:
			strs = append(strs, "-a")
		case TsSmbLink:
			strs = append(strs, "-h")
		}
		setPos(&x.OpPos, strs...)
		recurse(x.X)
	case *BinaryCmd:
		setPos(&x.OpPos, x.Op.String())
		recurse(x.X)
		recurse(x.Y)
	case *BinaryArithm:
		setPos(&x.OpPos, x.Op.String())
		recurse(x.X)
		recurse(x.Y)
	case *BinaryTest:
		strs := []string{x.Op.String()}
		switch x.Op {
		case TsMatch:
			strs = append(strs, "=")
		}
		setPos(&x.OpPos, strs...)
		recurse(x.X)
		recurse(x.Y)
	case *ParenArithm:
		setPos(&x.Lparen, "(")
		setPos(&x.Rparen, ")")
		recurse(x.X)
	case *ParenTest:
		setPos(&x.Lparen, "(")
		setPos(&x.Rparen, ")")
		recurse(x.X)
	case *FuncDecl:
		if x.RsrvWord {
			setPos(&x.Position, "function")
		} else {
			setPos(&x.Position)
		}
		recurse(x.Name)
		recurse(x.Body)
	case *ParamExp:
		doll := "$"
		if x.nakedIndex() {
			doll = ""
		}
		setPos(&x.Dollar, doll)
		if !x.Short {
			setPos(&x.Rbrace, "}")
		} else if x.nakedIndex() {
			checkSrc(posAddCol(x.End(), -1), "]")
		}
		recurse(x.Param)
		if x.Index != nil {
			recurse(x.Index)
		}
		if x.Slice != nil {
			if x.Slice.Offset != nil {
				recurse(x.Slice.Offset)
			}
			if x.Slice.Length != nil {
				recurse(x.Slice.Length)
			}
		}
		if x.Repl != nil {
			if x.Repl.Orig != nil {
				recurse(x.Repl.Orig)
			}
			if x.Repl.With != nil {
				recurse(x.Repl.With)
			}
		}
		if x.Exp != nil && x.Exp.Word != nil {
			recurse(x.Exp.Word)
		}
	case *ArithmExp:
		if x.Bracket {
			// deprecated $(( form
			setPos(&x.Left, "$[")
			setPos(&x.Right, "]")
		} else {
			setPos(&x.Left, "$((")
			setPos(&x.Right, "))")
		}
		recurse(x.X)
	case *ArithmCmd:
		setPos(&x.Left, "((")
		setPos(&x.Right, "))")
		recurse(x.X)
	case *CmdSubst:
		switch {
		case x.TempFile:
			setPos(&x.Left, "${ ", "${\t", "${\n")
			setPos(&x.Right, "}")
		case x.ReplyVar:
			setPos(&x.Left, "${|")
			setPos(&x.Right, "}")
		case x.Backquotes:
			setPos(&x.Left, "`", "\\`")
			setPos(&x.Right, "`", "\\`")
			// Zero out Backquotes, to not duplicate all the test
			// cases. The printer ignores the field anyway.
			x.Backquotes = false
		default:
			setPos(&x.Left, "$(")
			setPos(&x.Right, ")")
		}
		recurse(x.Stmts)
		recurse(x.Last)
	case *CaseClause:
		setPos(&x.Case, "case")
		if x.Braces {
			setPos(&x.In, "{")
			setPos(&x.Esac, "}")
			// Zero out Braces, to not duplicate all the test cases.
			// The printer ignores the field anyway.
			x.Braces = false
		} else {
			setPos(&x.In, "in")
			setPos(&x.Esac, "esac")
		}
		recurse(x.Word)
		for _, ci := range x.Items {
			recurse(ci)
		}
	case *CaseItem:
		if x.OpPos.IsValid() {
			setPos(&x.OpPos, x.Op.String(), "esac")
		}
		recurse(x.Patterns)
		recurse(x.Stmts)
		recurse(x.Last)
	case *TestClause:
		setPos(&x.Left, "[[")
		setPos(&x.Right, "]]")
		recurse(x.X)
	case *DeclClause:
		recurse(x.Variant)
		recurse(x.Args)
	case *TimeClause:
		setPos(&x.Time, "time")
		if x.Stmt != nil {
			recurse(x.Stmt)
		}
	case *CoprocClause:
		setPos(&x.Coproc, "coproc")
		if x.Name != nil {
			recurse(x.Name)
		}
		recurse(x.Stmt)
	case *LetClause:
		setPos(&x.Let, "let")
		for _, expr := range x.Exprs {
			recurse(expr)
		}
	case *TestDecl:
		setPos(&x.Position, "@test")
		recurse(x.Description)
		recurse(x.Body)
	case *ArrayExpr:
		setPos(&x.Lparen, "(")
		setPos(&x.Rparen, ")")
		for _, elem := range x.Elems {
			recurse(elem)
		}
	case *ArrayElem:
		if x.Index != nil {
			recurse(x.Index)
		}
		if x.Value != nil {
			recurse(x.Value)
		}
	case *ExtGlob:
		setPos(&x.OpPos, x.Op.String())
		checkSrc(posAddCol(x.End(), -1), ")")
		recurse(x.Pattern)
	case *ProcSubst:
		setPos(&x.OpPos, x.Op.String())
		setPos(&x.Rparen, ")")
		recurse(x.Stmts)
		recurse(x.Last)
	default:
		panic(reflect.TypeOf(v))
	}
}
07070100000059000081A4000003E800000064000000016046124D00004C6D000000000000000000000000000000000000001900000000sh-3.2.4/syntax/lexer.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bytes"
	"io"
	"unicode/utf8"
)

// bytes that form or start a token
func regOps(r rune) bool {
	switch r {
	case ';', '"', '\'', '(', ')', '$', '|', '&', '>', '<', '`':
		return true
	}
	return false
}

// tokenize these inside parameter expansions
func paramOps(r rune) bool {
	switch r {
	case '}', '#', '!', ':', '-', '+', '=', '?', '%', '[', ']', '/', '^',
		',', '@', '*':
		return true
	}
	return false
}

// these start a parameter expansion name
func paramNameOp(r rune) bool {
	switch r {
	case '}', ':', '+', '=', '%', '[', ']', '/', '^', ',':
		return false
	}
	return true
}

// tokenize these inside arithmetic expansions
func arithmOps(r rune) bool {
	switch r {
	case '+', '-', '!', '~', '*', '/', '%', '(', ')', '^', '<', '>', ':', '=',
		',', '?', '|', '&', '[', ']', '#':
		return true
	}
	return false
}

func bquoteEscaped(b byte) bool {
	switch b {
	case '$', '`', '\\':
		return true
	}
	return false
}

const escNewl rune = utf8.RuneSelf + 1

func (p *Parser) rune() rune {
	if p.r == '\n' || p.r == escNewl {
		// p.r instead of b so that newline
		// character positions don't have col 0.
		if p.npos.line++; p.npos.line == 0 {
			p.lineOverflow = true
		}
		p.npos.col = 0
		p.colOverflow = false
	}
	if p.npos.col += p.w; p.npos.col < p.w {
		p.colOverflow = true
	}
	bquotes := 0
retry:
	if p.bsp < len(p.bs) {
		if b := p.bs[p.bsp]; b < utf8.RuneSelf {
			p.bsp++
			if b == '\\' {
				if p.r != '\\' && p.peekByte('\n') {
					p.bsp++
					p.w, p.r = 1, escNewl
					return escNewl
				}
				if p.openBquotes > 0 && bquotes < p.openBquotes &&
					p.bsp < len(p.bs) && bquoteEscaped(p.bs[p.bsp]) {
					bquotes++
					goto retry
				}
			}
			if b == '`' {
				p.lastBquoteEsc = bquotes
			}
			if p.litBs != nil {
				p.litBs = append(p.litBs, b)
			}
			p.w, p.r = 1, rune(b)
			return p.r
		}
		if !utf8.FullRune(p.bs[p.bsp:]) {
			// we need more bytes to read a full non-ascii rune
			p.fill()
		}
		var w int
		p.r, w = utf8.DecodeRune(p.bs[p.bsp:])
		if p.litBs != nil {
			p.litBs = append(p.litBs, p.bs[p.bsp:p.bsp+w]...)
		}
		p.bsp += w
		if p.r == utf8.RuneError && w == 1 {
			p.posErr(p.npos, "invalid UTF-8 encoding")
		}
		p.w = uint16(w)
	} else {
		if p.r == utf8.RuneSelf {
		} else if p.fill(); p.bs == nil {
			p.bsp++
			p.r = utf8.RuneSelf
			p.w = 1
		} else {
			goto retry
		}
	}
	return p.r
}

// fill reads more bytes from the input src into readBuf. Any bytes that
// had not yet been used at the end of the buffer are slid into the
// beginning of the buffer.
func (p *Parser) fill() {
	p.offs += p.bsp
	left := len(p.bs) - p.bsp
	copy(p.readBuf[:left], p.readBuf[p.bsp:])
readAgain:
	n, err := 0, p.readErr
	if err == nil {
		n, err = p.src.Read(p.readBuf[left:])
		p.readErr = err
	}
	if n == 0 {
		if err == nil {
			goto readAgain
		}
		// don't use p.errPass as we don't want to overwrite p.tok
		if err != io.EOF {
			p.err = err
		}
		if left > 0 {
			p.bs = p.readBuf[:left]
		} else {
			p.bs = nil
		}
	} else {
		p.bs = p.readBuf[:left+n]
	}
	p.bsp = 0
}

func (p *Parser) nextKeepSpaces() {
	r := p.r
	p.pos = p.getPos()
	switch p.quote {
	case paramExpRepl:
		switch r {
		case '}', '/':
			p.tok = p.paramToken(r)
		case '`', '"', '$', '\'':
			p.tok = p.regToken(r)
		default:
			p.advanceLitOther(r)
		}
	case dblQuotes:
		switch r {
		case '`', '"', '$':
			p.tok = p.dqToken(r)
		default:
			p.advanceLitDquote(r)
		}
	case hdocBody, hdocBodyTabs:
		switch r {
		case '`', '$':
			p.tok = p.dqToken(r)
		default:
			p.advanceLitHdoc(r)
		}
	default: // paramExpExp:
		switch r {
		case '}':
			p.tok = p.paramToken(r)
		case '`', '"', '$', '\'':
			p.tok = p.regToken(r)
		default:
			p.advanceLitOther(r)
		}
	}
	if p.err != nil && p.tok != _EOF {
		p.tok = _EOF
	}
}

func (p *Parser) next() {
	if p.r == utf8.RuneSelf {
		p.tok = _EOF
		return
	}
	for p.r == escNewl {
		p.rune()
	}
	p.spaced = false
	if p.quote&allKeepSpaces != 0 {
		p.nextKeepSpaces()
		return
	}
	r := p.r
skipSpace:
	for {
		switch r {
		case utf8.RuneSelf:
			p.tok = _EOF
			return
		case escNewl:
			r = p.rune()
		case ' ', '\t', '\r':
			p.spaced = true
			r = p.rune()
		case '\n':
			if p.tok == _Newl {
				// merge consecutive newline tokens
				r = p.rune()
				continue
			}
			p.spaced = true
			p.tok = _Newl
			if p.quote != hdocWord && len(p.heredocs) > p.buriedHdocs {
				p.doHeredocs()
			}
			return
		default:
			break skipSpace
		}
	}
	if p.stopAt != nil && (p.spaced || p.tok == illegalTok || stopToken(p.tok)) {
		w := utf8.RuneLen(r)
		if bytes.HasPrefix(p.bs[p.bsp-w:], p.stopAt) {
			p.r = utf8.RuneSelf
			p.w = 1
			p.tok = _EOF
			return
		}
	}
	p.pos = p.getPos()
	switch {
	case p.quote&allRegTokens != 0:
		switch r {
		case ';', '"', '\'', '(', ')', '$', '|', '&', '>', '<', '`':
			p.tok = p.regToken(r)
		case '#':
			r = p.rune()
			p.newLit(r)
			for r != '\n' && r != utf8.RuneSelf {
				if r == escNewl {
					p.litBs = append(p.litBs, '\\', '\n')
					break
				}
				r = p.rune()
			}
			if p.keepComments {
				*p.curComs = append(*p.curComs, Comment{
					Hash: p.pos,
					Text: p.endLit(),
				})
			} else {
				p.litBs = nil
			}
			p.next()
		case '[', '=':
			if p.quote == arrayElems {
				p.tok = p.paramToken(r)
			} else {
				p.advanceLitNone(r)
			}
		case '?', '*', '+', '@', '!':
			if p.peekByte('(') {
				switch r {
				case '?':
					p.tok = globQuest
				case '*':
					p.tok = globStar
				case '+':
					p.tok = globPlus
				case '@':
					p.tok = globAt
				default: // '!'
					p.tok = globExcl
				}
				p.rune()
				p.rune()
			} else {
				p.advanceLitNone(r)
			}
		default:
			p.advanceLitNone(r)
		}
	case p.quote&allArithmExpr != 0 && arithmOps(r):
		p.tok = p.arithmToken(r)
	case p.quote&allParamExp != 0 && paramOps(r):
		p.tok = p.paramToken(r)
	case p.quote == testExprRegexp:
		if !p.rxFirstPart && p.spaced {
			p.quote = noState
			goto skipSpace
		}
		p.rxFirstPart = false
		switch r {
		case ';', '"', '\'', '$', '&', '>', '<', '`':
			p.tok = p.regToken(r)
		case ')':
			if p.rxOpenParens > 0 {
				// continuation of open paren
				p.advanceLitRe(r)
			} else {
				p.tok = rightParen
				p.quote = noState
				p.rune() // we are tokenizing manually
			}
		default: // including '(', '|'
			p.advanceLitRe(r)
		}
	case regOps(r):
		p.tok = p.regToken(r)
	default:
		p.advanceLitOther(r)
	}
	if p.err != nil && p.tok != _EOF {
		p.tok = _EOF
	}
}

func (p *Parser) peekByte(b byte) bool {
	if p.bsp == len(p.bs) {
		p.fill()
	}
	return p.bsp < len(p.bs) && p.bs[p.bsp] == b
}

func (p *Parser) regToken(r rune) token {
	switch r {
	case '\'':
		if p.openBquotes > 0 {
			// bury openBquotes
			p.buriedBquotes = p.openBquotes
			p.openBquotes = 0
		}
		p.rune()
		return sglQuote
	case '"':
		p.rune()
		return dblQuote
	case '`':
		// Don't call p.rune, as we need to work out p.openBquotes to
		// properly handle backslashes in the lexer.
		return bckQuote
	case '&':
		switch p.rune() {
		case '&':
			p.rune()
			return andAnd
		case '>':
			if p.lang == LangPOSIX {
				break
			}
			if p.rune() == '>' {
				p.rune()
				return appAll
			}
			return rdrAll
		}
		return and
	case '|':
		switch p.rune() {
		case '|':
			p.rune()
			return orOr
		case '&':
			if p.lang == LangPOSIX {
				break
			}
			p.rune()
			return orAnd
		}
		return or
	case '$':
		switch p.rune() {
		case '\'':
			if p.lang == LangPOSIX {
				break
			}
			p.rune()
			return dollSglQuote
		case '"':
			if p.lang == LangPOSIX {
				break
			}
			p.rune()
			return dollDblQuote
		case '{':
			p.rune()
			return dollBrace
		case '[':
			if !p.lang.isBash() || p.quote == paramExpName {
				// latter to not tokenise ${$[@]} as $[
				break
			}
			p.rune()
			return dollBrack
		case '(':
			if p.rune() == '(' {
				p.rune()
				return dollDblParen
			}
			return dollParen
		}
		return dollar
	case '(':
		if p.rune() == '(' && p.lang != LangPOSIX && p.quote != testExpr {
			p.rune()
			return dblLeftParen
		}
		return leftParen
	case ')':
		p.rune()
		return rightParen
	case ';':
		switch p.rune() {
		case ';':
			if p.rune() == '&' && p.lang.isBash() {
				p.rune()
				return dblSemiAnd
			}
			return dblSemicolon
		case '&':
			if p.lang == LangPOSIX {
				break
			}
			p.rune()
			return semiAnd
		case '|':
			if p.lang != LangMirBSDKorn {
				break
			}
			p.rune()
			return semiOr
		}
		return semicolon
	case '<':
		switch p.rune() {
		case '<':
			if r = p.rune(); r == '-' {
				p.rune()
				return dashHdoc
			} else if r == '<' && p.lang != LangPOSIX {
				p.rune()
				return wordHdoc
			}
			return hdoc
		case '>':
			p.rune()
			return rdrInOut
		case '&':
			p.rune()
			return dplIn
		case '(':
			if !p.lang.isBash() {
				break
			}
			p.rune()
			return cmdIn
		}
		return rdrIn
	default: // '>'
		switch p.rune() {
		case '>':
			p.rune()
			return appOut
		case '&':
			p.rune()
			return dplOut
		case '|':
			p.rune()
			return clbOut
		case '(':
			if !p.lang.isBash() {
				break
			}
			p.rune()
			return cmdOut
		}
		return rdrOut
	}
}

func (p *Parser) dqToken(r rune) token {
	switch r {
	case '"':
		p.rune()
		return dblQuote
	case '`':
		// Don't call p.rune, as we need to work out p.openBquotes to
		// properly handle backslashes in the lexer.
		return bckQuote
	default: // '$'
		switch p.rune() {
		case '{':
			p.rune()
			return dollBrace
		case '[':
			if !p.lang.isBash() {
				break
			}
			p.rune()
			return dollBrack
		case '(':
			if p.rune() == '(' {
				p.rune()
				return dollDblParen
			}
			return dollParen
		}
		return dollar
	}
}

func (p *Parser) paramToken(r rune) token {
	switch r {
	case '}':
		p.rune()
		return rightBrace
	case ':':
		switch p.rune() {
		case '+':
			p.rune()
			return colPlus
		case '-':
			p.rune()
			return colMinus
		case '?':
			p.rune()
			return colQuest
		case '=':
			p.rune()
			return colAssgn
		}
		return colon
	case '+':
		p.rune()
		return plus
	case '-':
		p.rune()
		return minus
	case '?':
		p.rune()
		return quest
	case '=':
		p.rune()
		return assgn
	case '%':
		if p.rune() == '%' {
			p.rune()
			return dblPerc
		}
		return perc
	case '#':
		if p.rune() == '#' {
			p.rune()
			return dblHash
		}
		return hash
	case '!':
		p.rune()
		return exclMark
	case '[':
		p.rune()
		return leftBrack
	case ']':
		p.rune()
		return rightBrack
	case '/':
		if p.rune() == '/' && p.quote != paramExpRepl {
			p.rune()
			return dblSlash
		}
		return slash
	case '^':
		if p.rune() == '^' {
			p.rune()
			return dblCaret
		}
		return caret
	case ',':
		if p.rune() == ',' {
			p.rune()
			return dblComma
		}
		return comma
	case '@':
		p.rune()
		return at
	default: // '*'
		p.rune()
		return star
	}
}

func (p *Parser) arithmToken(r rune) token {
	switch r {
	case '!':
		if p.rune() == '=' {
			p.rune()
			return nequal
		}
		return exclMark
	case '=':
		if p.rune() == '=' {
			p.rune()
			return equal
		}
		return assgn
	case '~':
		p.rune()
		return tilde
	case '(':
		p.rune()
		return leftParen
	case ')':
		p.rune()
		return rightParen
	case '&':
		switch p.rune() {
		case '&':
			p.rune()
			return andAnd
		case '=':
			p.rune()
			return andAssgn
		}
		return and
	case '|':
		switch p.rune() {
		case '|':
			p.rune()
			return orOr
		case '=':
			p.rune()
			return orAssgn
		}
		return or
	case '<':
		switch p.rune() {
		case '<':
			if p.rune() == '=' {
				p.rune()
				return shlAssgn
			}
			return hdoc
		case '=':
			p.rune()
			return lequal
		}
		return rdrIn
	case '>':
		switch p.rune() {
		case '>':
			if p.rune() == '=' {
				p.rune()
				return shrAssgn
			}
			return appOut
		case '=':
			p.rune()
			return gequal
		}
		return rdrOut
	case '+':
		switch p.rune() {
		case '+':
			p.rune()
			return addAdd
		case '=':
			p.rune()
			return addAssgn
		}
		return plus
	case '-':
		switch p.rune() {
		case '-':
			p.rune()
			return subSub
		case '=':
			p.rune()
			return subAssgn
		}
		return minus
	case '%':
		if p.rune() == '=' {
			p.rune()
			return remAssgn
		}
		return perc
	case '*':
		switch p.rune() {
		case '*':
			p.rune()
			return power
		case '=':
			p.rune()
			return mulAssgn
		}
		return star
	case '/':
		if p.rune() == '=' {
			p.rune()
			return quoAssgn
		}
		return slash
	case '^':
		if p.rune() == '=' {
			p.rune()
			return xorAssgn
		}
		return caret
	case '[':
		p.rune()
		return leftBrack
	case ']':
		p.rune()
		return rightBrack
	case ',':
		p.rune()
		return comma
	case '?':
		p.rune()
		return quest
	case ':':
		p.rune()
		return colon
	default: // '#'
		p.rune()
		return hash
	}
}

func (p *Parser) newLit(r rune) {
	switch {
	case r < utf8.RuneSelf:
		p.litBs = p.litBuf[:1]
		p.litBs[0] = byte(r)
	case r > escNewl:
		w := utf8.RuneLen(r)
		p.litBs = append(p.litBuf[:0], p.bs[p.bsp-w:p.bsp]...)
	default:
		// don't let r == utf8.RuneSelf go to the second case as RuneLen
		// would return -1
		p.litBs = p.litBuf[:0]
	}
}

func (p *Parser) endLit() (s string) {
	if p.r == utf8.RuneSelf || p.r == escNewl {
		s = string(p.litBs)
	} else {
		s = string(p.litBs[:len(p.litBs)-int(p.w)])
	}
	p.litBs = nil
	return
}

func (p *Parser) isLitRedir() bool {
	lit := p.litBs[:len(p.litBs)-1]
	if lit[0] == '{' && lit[len(lit)-1] == '}' {
		return ValidName(string(lit[1 : len(lit)-1]))
	}
	for _, b := range lit {
		switch b {
		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		default:
			return false
		}
	}
	return true
}

func (p *Parser) advanceNameCont(r rune) {
	// we know that r is a letter or underscore
loop:
	for p.newLit(r); r != utf8.RuneSelf; r = p.rune() {
		switch {
		case 'a' <= r && r <= 'z':
		case 'A' <= r && r <= 'Z':
		case r == '_':
		case '0' <= r && r <= '9':
		case r == escNewl:
		default:
			break loop
		}
	}
	p.tok, p.val = _LitWord, p.endLit()
}

func (p *Parser) advanceLitOther(r rune) {
	tok := _LitWord
loop:
	for p.newLit(r); r != utf8.RuneSelf; r = p.rune() {
		switch r {
		case '\\': // escaped byte follows
			p.rune()
		case '\'', '"', '`', '$':
			tok = _Lit
			break loop
		case '}':
			if p.quote&allParamExp != 0 {
				break loop
			}
		case '/':
			if p.quote != paramExpExp {
				break loop
			}
		case ':', '=', '%', '^', ',', '?', '!', '~', '*':
			if p.quote&allArithmExpr != 0 || p.quote == paramExpName {
				break loop
			}
		case '[', ']':
			if p.lang != LangPOSIX && p.quote&allArithmExpr != 0 {
				break loop
			}
			fallthrough
		case '#', '@':
			if p.quote&allParamReg != 0 {
				break loop
			}
		case '+', '-', ' ', '\t', ';', '&', '>', '<', '|', '(', ')', '\n', '\r':
			if p.quote&allKeepSpaces == 0 {
				break loop
			}
		}
	}
	p.tok, p.val = tok, p.endLit()
}

func (p *Parser) advanceLitNone(r rune) {
	p.eqlOffs = -1
	tok := _LitWord
loop:
	for p.newLit(r); r != utf8.RuneSelf; r = p.rune() {
		switch r {
		case ' ', '\t', '\n', '\r', '&', '|', ';', '(', ')':
			break loop
		case '\\': // escaped byte follows
			p.rune()
		case '>', '<':
			if p.peekByte('(') {
				tok = _Lit
			} else if p.isLitRedir() {
				tok = _LitRedir
			}
			break loop
		case '`':
			if p.quote != subCmdBckquo {
				tok = _Lit
			}
			break loop
		case '"', '\'', '$':
			tok = _Lit
			break loop
		case '?', '*', '+', '@', '!':
			if p.peekByte('(') {
				tok = _Lit
				break loop
			}
		case '=':
			if p.eqlOffs < 0 {
				p.eqlOffs = len(p.litBs) - 1
			}
		case '[':
			if p.lang != LangPOSIX && len(p.litBs) > 1 && p.litBs[0] != '[' {
				tok = _Lit
				break loop
			}
		}
	}
	p.tok, p.val = tok, p.endLit()
}

func (p *Parser) advanceLitDquote(r rune) {
	tok := _LitWord
loop:
	for p.newLit(r); r != utf8.RuneSelf; r = p.rune() {
		switch r {
		case '"':
			break loop
		case '\\': // escaped byte follows
			p.rune()
		case escNewl, '`', '$':
			tok = _Lit
			break loop
		}
	}
	p.tok, p.val = tok, p.endLit()
}

func (p *Parser) advanceLitHdoc(r rune) {
	p.tok = _Lit
	p.newLit(r)
	if p.quote == hdocBodyTabs {
		for r == '\t' {
			r = p.rune()
		}
	}
	lStart := len(p.litBs) - 1
	stop := p.hdocStops[len(p.hdocStops)-1]
	for ; ; r = p.rune() {
		switch r {
		case escNewl, '`', '$':
			p.val = p.endLit()
			return
		case '\\': // escaped byte follows
			p.rune()
		case '\n', utf8.RuneSelf:
			if p.parsingDoc {
				if r == utf8.RuneSelf {
					p.val = p.endLit()
					return
				}
			} else if lStart >= 0 {
				// Compare the current line with the stop word.
				line := p.litBs[lStart:]
				if r == '\n' && len(line) > 0 {
					line = line[:len(line)-1] // minus \n
				}
				if bytes.Equal(line, stop) {
					p.val = p.endLit()[:lStart]
					if p.val == "" {
						p.tok = _Newl
					}
					p.hdocStops[len(p.hdocStops)-1] = nil
					return
				}
			}
			if r == utf8.RuneSelf {
				return
			}
			if p.quote == hdocBodyTabs {
				for p.peekByte('\t') {
					p.rune()
				}
			}
			lStart = len(p.litBs)
		}
	}
}

func (p *Parser) quotedHdocWord() *Word {
	r := p.r
	p.newLit(r)
	pos := p.getPos()
	stop := p.hdocStops[len(p.hdocStops)-1]
	for ; ; r = p.rune() {
		if r == utf8.RuneSelf {
			return nil
		}
		if p.quote == hdocBodyTabs {
			for r == '\t' {
				r = p.rune()
			}
		}
		lStart := len(p.litBs) - 1
		for r != utf8.RuneSelf && r != '\n' {
			if r == escNewl {
				p.litBs = append(p.litBs, '\\', '\n')
				break
			}
			r = p.rune()
		}
		if lStart < 0 {
			continue
		}
		// Compare the current line with the stop word.
		line := p.litBs[lStart:]
		if r == '\n' && len(line) > 0 {
			line = line[:len(line)-1] // minus \n
		}
		if bytes.Equal(line, stop) {
			p.hdocStops[len(p.hdocStops)-1] = nil
			val := p.endLit()[:lStart]
			if val == "" {
				return nil
			}
			return p.word(p.wps(p.lit(pos, val)))
		}
	}
}

func (p *Parser) advanceLitRe(r rune) {
	for p.newLit(r); ; r = p.rune() {
		switch r {
		case '\\':
			p.rune()
		case '(':
			p.rxOpenParens++
		case ')':
			if p.rxOpenParens--; p.rxOpenParens < 0 {
				p.tok, p.val = _LitWord, p.endLit()
				p.quote = noState
				return
			}
		case ' ', '\t', '\r', '\n', ';', '&', '>', '<':
			if p.rxOpenParens <= 0 {
				p.tok, p.val = _LitWord, p.endLit()
				p.quote = noState
				return
			}
		case '"', '\'', '$', '`':
			p.tok, p.val = _Lit, p.endLit()
			return
		case utf8.RuneSelf:
			p.tok, p.val = _LitWord, p.endLit()
			p.quote = noState
			return
		}
	}
}

func testUnaryOp(val string) UnTestOperator {
	switch val {
	case "!":
		return TsNot
	case "-e", "-a":
		return TsExists
	case "-f":
		return TsRegFile
	case "-d":
		return TsDirect
	case "-c":
		return TsCharSp
	case "-b":
		return TsBlckSp
	case "-p":
		return TsNmPipe
	case "-S":
		return TsSocket
	case "-L", "-h":
		return TsSmbLink
	case "-k":
		return TsSticky
	case "-g":
		return TsGIDSet
	case "-u":
		return TsUIDSet
	case "-G":
		return TsGrpOwn
	case "-O":
		return TsUsrOwn
	case "-N":
		return TsModif
	case "-r":
		return TsRead
	case "-w":
		return TsWrite
	case "-x":
		return TsExec
	case "-s":
		return TsNoEmpty
	case "-t":
		return TsFdTerm
	case "-z":
		return TsEmpStr
	case "-n":
		return TsNempStr
	case "-o":
		return TsOptSet
	case "-v":
		return TsVarSet
	case "-R":
		return TsRefVar
	default:
		return 0
	}
}

func testBinaryOp(val string) BinTestOperator {
	switch val {
	case "=":
		return TsMatchShort
	case "==":
		return TsMatch
	case "!=":
		return TsNoMatch
	case "=~":
		return TsReMatch
	case "-nt":
		return TsNewer
	case "-ot":
		return TsOlder
	case "-ef":
		return TsDevIno
	case "-eq":
		return TsEql
	case "-ne":
		return TsNeq
	case "-le":
		return TsLeq
	case "-ge":
		return TsGeq
	case "-lt":
		return TsLss
	case "-gt":
		return TsGtr
	default:
		return 0
	}
}
0707010000005A000081A4000003E800000064000000016046124D00005B03000000000000000000000000000000000000001900000000sh-3.2.4/syntax/nodes.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"strconv"
	"strings"
)

// Node represents a syntax tree node.
type Node interface {
	// Pos returns the position of the first character of the node. Comments
	// are ignored, except if the node is a *File.
	Pos() Pos
	// End returns the position of the character immediately after the node.
	// If the character is a newline, the line number won't cross into the
	// next line. Comments are ignored, except if the node is a *File.
	End() Pos
}

// File represents a shell source file.
type File struct {
	Name string

Stmts []*Stmt
	Last  []Comment
}

func (f *File) Pos() Pos { return stmtsPos(f.Stmts, f.Last) }
func (f *File) End() Pos { return stmtsEnd(f.Stmts, f.Last) }

func stmtsPos(stmts []*Stmt, last []Comment) Pos {
	if len(stmts) > 0 {
		s := stmts[0]
		sPos := s.Pos()
		if len(s.Comments) > 0 {
			if cPos := s.Comments[0].Pos(); sPos.After(cPos) {
				return cPos
			}
		}
		return sPos
	}
	if len(last) > 0 {
		return last[0].Pos()
	}
	return Pos{}
}

func stmtsEnd(stmts []*Stmt, last []Comment) Pos {
	if len(last) > 0 {
		return last[len(last)-1].End()
	}
	if len(stmts) > 0 {
		s := stmts[len(stmts)-1]
		sEnd := s.End()
		if len(s.Comments) > 0 {
			if cEnd := s.Comments[0].End(); cEnd.After(sEnd) {
				return cEnd
			}
		}
		return sEnd
	}
	return Pos{}
}

// Pos is a position within a shell source file.
type Pos struct {
	offs      uint32
	line, col uint16
}

// Offset returns the byte offset of the position in the original source file.
// Byte offsets start at 0.
func (p Pos) Offset() uint { return uint(p.offs) }

// Line returns the line number of the position, starting at 1.
//
// Line is protected against overflows; if an input has too many lines, extra
// lines will have a line number of 0, rendered as "?".
func (p Pos) Line() uint { return uint(p.line) }

// Col returns the column number of the position, starting at 1. It counts in
// bytes.
//
// Col is protected against overflows; if an input line has too many columns,
// extra columns will have a column number of 0, rendered as "?".
func (p Pos) Col() uint { return uint(p.col) }

func (p Pos) String() string {
	var b strings.Builder
	if line := p.Line(); line > 0 {
		b.WriteString(strconv.FormatUint(uint64(line), 10))
	} else {
		b.WriteByte('?')
	}
	b.WriteByte(':')
	if col := p.Col(); col > 0 {
		b.WriteString(strconv.FormatUint(uint64(col), 10))
	} else {
		b.WriteByte('?')
	}
	return b.String()
}

// IsValid reports whether the position is valid. All positions in nodes
// returned by Parse are valid.
func (p Pos) IsValid() bool { return p != Pos{} }

// After reports whether the position p is after p2. It is a more expressive
// version of p.Offset() > p2.Offset().
func (p Pos) After(p2 Pos) bool { return p.offs > p2.offs }

func posAddCol(p Pos, n int) Pos {
	p.col += uint16(n)
	p.offs += uint32(n)
	return p
}

func posMax(p1, p2 Pos) Pos {
	if p2.After(p1) {
		return p2
	}
	return p1
}

// Comment represents a single comment on a single line.
type Comment struct {
	Hash Pos
	Text string
}

func (c *Comment) Pos() Pos { return c.Hash }
func (c *Comment) End() Pos { return posAddCol(c.Hash, 1+len(c.Text)) }

// Stmt represents a statement, also known as a "complete command". It is
// compromised of a command and other components that may come before or after
// it.
type Stmt struct {
	Comments   []Comment
	Cmd        Command
	Position   Pos
	Semicolon  Pos  // position of ';', '&', or '|&', if any
	Negated    bool // ! stmt
	Background bool // stmt &
	Coprocess  bool // mksh's |&

Redirs []*Redirect // stmt >a <b
}

func (s *Stmt) Pos() Pos { return s.Position }
func (s *Stmt) End() Pos {
	if s.Semicolon.IsValid() {
		end := posAddCol(s.Semicolon, 1) // ';' or '&'
		if s.Coprocess {
			end = posAddCol(end, 1) // '|&'
		}
		return end
	}
	end := s.Position
	if s.Negated {
		end = posAddCol(end, 1)
	}
	if s.Cmd != nil {
		end = s.Cmd.End()
	}
	if len(s.Redirs) > 0 {
		end = posMax(end, s.Redirs[len(s.Redirs)-1].End())
	}
	return end
}

// Command represents all nodes that are simple or compound commands, including
// function declarations.
//
// These are *CallExpr, *IfClause, *WhileClause, *ForClause, *CaseClause,
// *Block, *Subshell, *BinaryCmd, *FuncDecl, *ArithmCmd, *TestClause,
// *DeclClause, *LetClause, *TimeClause, and *CoprocClause.
type Command interface {
	Node
	commandNode()
}

func (*CallExpr) commandNode()     {}
func (*IfClause) commandNode()     {}
func (*WhileClause) commandNode()  {}
func (*ForClause) commandNode()    {}
func (*CaseClause) commandNode()   {}
func (*Block) commandNode()        {}
func (*Subshell) commandNode()     {}
func (*BinaryCmd) commandNode()    {}
func (*FuncDecl) commandNode()     {}
func (*ArithmCmd) commandNode()    {}
func (*TestClause) commandNode()   {}
func (*DeclClause) commandNode()   {}
func (*LetClause) commandNode()    {}
func (*TimeClause) commandNode()   {}
func (*CoprocClause) commandNode() {}
func (*TestDecl) commandNode()     {}

// Assign represents an assignment to a variable.
//
// Here and elsewhere, Index can mean either an index expression into an indexed
// array, or a string key into an associative array.
//
// If Index is non-nil, the value will be a word and not an array as nested
// arrays are not allowed.
//
// If Naked is true and Name is nil, the assignment is part of a DeclClause and
// the argument (in the Value field) will be evaluated at run-time. This
// includes parameter expansions, which may expand to assignments or options.
type Assign struct {
	Append bool       // +=
	Naked  bool       // without '='
	Name   *Lit       // must be a valid name
	Index  ArithmExpr // [i], ["k"]
	Value  *Word      // =val
	Array  *ArrayExpr // =(arr)
}

func (a *Assign) Pos() Pos {
	if a.Name == nil {
		return a.Value.Pos()
	}
	return a.Name.Pos()
}

func (a *Assign) End() Pos {
	if a.Value != nil {
		return a.Value.End()
	}
	if a.Array != nil {
		return a.Array.End()
	}
	if a.Index != nil {
		return posAddCol(a.Index.End(), 2)
	}
	if a.Naked {
		return a.Name.End()
	}
	return posAddCol(a.Name.End(), 1)
}

// Redirect represents an input/output redirection.
type Redirect struct {
	OpPos Pos
	Op    RedirOperator
	N     *Lit  // fd>, or {varname}> in Bash
	Word  *Word // >word
	Hdoc  *Word // here-document body
}

func (r *Redirect) Pos() Pos {
	if r.N != nil {
		return r.N.Pos()
	}
	return r.OpPos
}

func (r *Redirect) End() Pos {
	if r.Hdoc != nil {
		return r.Hdoc.End()
	}
	return r.Word.End()
}

// CallExpr represents a command execution or function call, otherwise known as
// a "simple command".
//
// If Args is empty, Assigns apply to the shell environment. Otherwise, they are
// variables that cannot be arrays and which only apply to the call.
type CallExpr struct {
	Assigns []*Assign // a=x b=y args
	Args    []*Word
}

func (c *CallExpr) Pos() Pos {
	if len(c.Assigns) > 0 {
		return c.Assigns[0].Pos()
	}
	return c.Args[0].Pos()
}

func (c *CallExpr) End() Pos {
	if len(c.Args) == 0 {
		return c.Assigns[len(c.Assigns)-1].End()
	}
	return c.Args[len(c.Args)-1].End()
}

// Subshell represents a series of commands that should be executed in a nested
// shell environment.
type Subshell struct {
	Lparen, Rparen Pos

Stmts []*Stmt
	Last  []Comment
}

func (s *Subshell) Pos() Pos { return s.Lparen }
func (s *Subshell) End() Pos { return posAddCol(s.Rparen, 1) }

// Block represents a series of commands that should be executed in a nested
// scope. It is essentially a list of statements within curly braces.
type Block struct {
	Lbrace, Rbrace Pos

Stmts []*Stmt
	Last  []Comment
}

func (b *Block) Pos() Pos { return b.Lbrace }
func (b *Block) End() Pos { return posAddCol(b.Rbrace, 1) }

// IfClause represents an if statement.
type IfClause struct {
	Position Pos // position of the starting "if", "elif", or "else" token
	ThenPos  Pos // position of "then", empty if this is an "else"
	FiPos    Pos // position of "fi", shared with .Else if non-nil

Cond     []*Stmt
	CondLast []Comment
	Then     []*Stmt
	ThenLast []Comment

Else *IfClause // if non-nil, an "elif" or an "else"

Last []Comment // comments on the first "elif", "else", or "fi"
}

func (c *IfClause) Pos() Pos { return c.Position }
func (c *IfClause) End() Pos { return posAddCol(c.FiPos, 2) }

// WhileClause represents a while or an until clause.
type WhileClause struct {
	WhilePos, DoPos, DonePos Pos
	Until                    bool

Cond     []*Stmt
	CondLast []Comment
	Do       []*Stmt
	DoLast   []Comment
}

func (w *WhileClause) Pos() Pos { return w.WhilePos }
func (w *WhileClause) End() Pos { return posAddCol(w.DonePos, 4) }

// ForClause represents a for or a select clause. The latter is only present in
// Bash.
type ForClause struct {
	ForPos, DoPos, DonePos Pos
	Select                 bool
	Braces                 bool // deprecated form with { } instead of do/done
	Loop                   Loop

Do     []*Stmt
	DoLast []Comment
}

func (f *ForClause) Pos() Pos { return f.ForPos }
func (f *ForClause) End() Pos { return posAddCol(f.DonePos, 4) }

// Loop holds either *WordIter or *CStyleLoop.
type Loop interface {
	Node
	loopNode()
}

func (*WordIter) loopNode()   {}
func (*CStyleLoop) loopNode() {}

// WordIter represents the iteration of a variable over a series of words in a
// for clause. If InPos is an invalid position, the "in" token was missing, so
// the iteration is over the shell's positional parameters.
type WordIter struct {
	Name  *Lit
	InPos Pos // position of "in"
	Items []*Word
}

func (w *WordIter) Pos() Pos { return w.Name.Pos() }
func (w *WordIter) End() Pos {
	if len(w.Items) > 0 {
		return wordLastEnd(w.Items)
	}
	return posMax(w.Name.End(), posAddCol(w.InPos, 2))
}

// CStyleLoop represents the behaviour of a for clause similar to the C
// language.
//
// This node will only appear with LangBash.
type CStyleLoop struct {
	Lparen, Rparen Pos
	// Init, Cond, Post can each be nil, if the for loop construct omits it.
	Init, Cond, Post ArithmExpr
}

func (c *CStyleLoop) Pos() Pos { return c.Lparen }
func (c *CStyleLoop) End() Pos { return posAddCol(c.Rparen, 2) }

// BinaryCmd represents a binary expression between two statements.
type BinaryCmd struct {
	OpPos Pos
	Op    BinCmdOperator
	X, Y  *Stmt
}

func (b *BinaryCmd) Pos() Pos { return b.X.Pos() }
func (b *BinaryCmd) End() Pos { return b.Y.End() }

// FuncDecl represents the declaration of a function.
type FuncDecl struct {
	Position Pos
	RsrvWord bool // non-posix "function f" style
	Parens   bool // with () parentheses, only meaningful with RsrvWord=true
	Name     *Lit
	Body     *Stmt
}

func (f *FuncDecl) Pos() Pos { return f.Position }
func (f *FuncDecl) End() Pos { return f.Body.End() }

// Word represents a shell word, containing one or more word parts contiguous to
// each other. The word is delimeted by word boundaries, such as spaces,
// newlines, semicolons, or parentheses.
type Word struct {
	Parts []WordPart
}

func (w *Word) Pos() Pos { return w.Parts[0].Pos() }
func (w *Word) End() Pos { return w.Parts[len(w.Parts)-1].End() }

// Lit returns the word as a literal value, if the word consists of *Lit nodes
// only. An empty string is returned otherwise. Words with multiple literals,
// which can appear in some edge cases, are handled properly.
//
// For example, the word "foo" will return "foo", but the word "foo${bar}" will
// return "".
func (w *Word) Lit() string {
	// In the usual case, we'll have either a single part that's a literal,
	// or one of the parts being a non-literal. Using strings.Join instead
	// of a strings.Builder avoids extra work in these cases, since a single
	// part is a shortcut, and many parts don't incur string copies.
	lits := make([]string, 0, 1)
	for _, part := range w.Parts {
		lit, ok := part.(*Lit)
		if !ok {
			return ""
		}
		lits = append(lits, lit.Value)
	}
	return strings.Join(lits, "")
}

// WordPart represents all nodes that can form part of a word.
//
// These are *Lit, *SglQuoted, *DblQuoted, *ParamExp, *CmdSubst, *ArithmExp,
// *ProcSubst, and *ExtGlob.
type WordPart interface {
	Node
	wordPartNode()
}

func (*Lit) wordPartNode()       {}
func (*SglQuoted) wordPartNode() {}
func (*DblQuoted) wordPartNode() {}
func (*ParamExp) wordPartNode()  {}
func (*CmdSubst) wordPartNode()  {}
func (*ArithmExp) wordPartNode() {}
func (*ProcSubst) wordPartNode() {}
func (*ExtGlob) wordPartNode()   {}
func (*BraceExp) wordPartNode()  {}

// Lit represents a string literal.
//
// Note that a parsed string literal may not appear as-is in the original source
// code, as it is possible to split literals by escaping newlines. The splitting
// is lost, but the end position is not.
type Lit struct {
	ValuePos, ValueEnd Pos
	Value              string
}

func (l *Lit) Pos() Pos { return l.ValuePos }
func (l *Lit) End() Pos { return l.ValueEnd }

// SglQuoted represents a string within single quotes.
type SglQuoted struct {
	Left, Right Pos
	Dollar      bool // $''
	Value       string
}

func (q *SglQuoted) Pos() Pos { return q.Left }
func (q *SglQuoted) End() Pos { return posAddCol(q.Right, 1) }

// DblQuoted represents a list of nodes within double quotes.
type DblQuoted struct {
	Left, Right Pos
	Dollar      bool // $""
	Parts       []WordPart
}

func (q *DblQuoted) Pos() Pos { return q.Left }
func (q *DblQuoted) End() Pos { return posAddCol(q.Right, 1) }

// CmdSubst represents a command substitution.
type CmdSubst struct {
	Left, Right Pos

Stmts []*Stmt
	Last  []Comment

Backquotes bool // deprecated `foo`
	TempFile   bool // mksh's ${ foo;}
	ReplyVar   bool // mksh's ${|foo;}
}

func (c *CmdSubst) Pos() Pos { return c.Left }
func (c *CmdSubst) End() Pos { return posAddCol(c.Right, 1) }

// ParamExp represents a parameter expansion.
type ParamExp struct {
	Dollar, Rbrace Pos

Short  bool // $a instead of ${a}
	Excl   bool // ${!a}
	Length bool // ${#a}
	Width  bool // ${%a}
	Param  *Lit
	Index  ArithmExpr       // ${a[i]}, ${a["k"]}
	Slice  *Slice           // ${a:x:y}
	Repl   *Replace         // ${a/x/y}
	Names  ParNamesOperator // ${!prefix*} or ${!prefix@}
	Exp    *Expansion       // ${a:-b}, ${a#b}, etc
}

func (p *ParamExp) Pos() Pos { return p.Dollar }
func (p *ParamExp) End() Pos {
	if !p.Short {
		return posAddCol(p.Rbrace, 1)
	}
	if p.Index != nil {
		return posAddCol(p.Index.End(), 1)
	}
	return p.Param.End()
}

func (p *ParamExp) nakedIndex() bool {
	return p.Short && p.Index != nil
}

// Slice represents a character slicing expression inside a ParamExp.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type Slice struct {
	Offset, Length ArithmExpr
}

// Replace represents a search and replace expression inside a ParamExp.
type Replace struct {
	All        bool
	Orig, With *Word
}

// Expansion represents string manipulation in a ParamExp other than those
// covered by Replace.
type Expansion struct {
	Op   ParExpOperator
	Word *Word
}

// ArithmExp represents an arithmetic expansion.
type ArithmExp struct {
	Left, Right Pos
	Bracket     bool // deprecated $[expr] form
	Unsigned    bool // mksh's $((# expr))

X ArithmExpr
}

func (a *ArithmExp) Pos() Pos { return a.Left }
func (a *ArithmExp) End() Pos {
	if a.Bracket {
		return posAddCol(a.Right, 1)
	}
	return posAddCol(a.Right, 2)
}

// ArithmCmd represents an arithmetic command.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type ArithmCmd struct {
	Left, Right Pos
	Unsigned    bool // mksh's ((# expr))

X ArithmExpr
}

func (a *ArithmCmd) Pos() Pos { return a.Left }
func (a *ArithmCmd) End() Pos { return posAddCol(a.Right, 2) }

// ArithmExpr represents all nodes that form arithmetic expressions.
//
// These are *BinaryArithm, *UnaryArithm, *ParenArithm, and *Word.
type ArithmExpr interface {
	Node
	arithmExprNode()
}

func (*BinaryArithm) arithmExprNode() {}
func (*UnaryArithm) arithmExprNode()  {}
func (*ParenArithm) arithmExprNode()  {}
func (*Word) arithmExprNode()         {}

// BinaryArithm represents a binary arithmetic expression.
//
// If Op is any assign operator, X will be a word with a single *Lit whose value
// is a valid name.
//
// Ternary operators like "a ? b : c" are fit into this structure. Thus, if
// Op==TernQuest, Y will be a *BinaryArithm with Op==TernColon. Op can only be
// TernColon in that scenario.
type BinaryArithm struct {
	OpPos Pos
	Op    BinAritOperator
	X, Y  ArithmExpr
}

func (b *BinaryArithm) Pos() Pos { return b.X.Pos() }
func (b *BinaryArithm) End() Pos { return b.Y.End() }

// UnaryArithm represents an unary arithmetic expression. The unary opearator
// may come before or after the sub-expression.
//
// If Op is Inc or Dec, X will be a word with a single *Lit whose value is a
// valid name.
type UnaryArithm struct {
	OpPos Pos
	Op    UnAritOperator
	Post  bool
	X     ArithmExpr
}

func (u *UnaryArithm) Pos() Pos {
	if u.Post {
		return u.X.Pos()
	}
	return u.OpPos
}

func (u *UnaryArithm) End() Pos {
	if u.Post {
		return posAddCol(u.OpPos, 2)
	}
	return u.X.End()
}

// ParenArithm represents an arithmetic expression within parentheses.
type ParenArithm struct {
	Lparen, Rparen Pos

X ArithmExpr
}

func (p *ParenArithm) Pos() Pos { return p.Lparen }
func (p *ParenArithm) End() Pos { return posAddCol(p.Rparen, 1) }

// CaseClause represents a case (switch) clause.
type CaseClause struct {
	Case, In, Esac Pos
	Braces         bool // deprecated mksh form with braces instead of in/esac

Word  *Word
	Items []*CaseItem
	Last  []Comment
}

func (c *CaseClause) Pos() Pos { return c.Case }
func (c *CaseClause) End() Pos { return posAddCol(c.Esac, 4) }

// CaseItem represents a pattern list (case) within a CaseClause.
type CaseItem struct {
	Op       CaseOperator
	OpPos    Pos // unset if it was finished by "esac"
	Comments []Comment
	Patterns []*Word

Stmts []*Stmt
	Last  []Comment
}

func (c *CaseItem) Pos() Pos { return c.Patterns[0].Pos() }
func (c *CaseItem) End() Pos {
	if c.OpPos.IsValid() {
		return posAddCol(c.OpPos, len(c.Op.String()))
	}
	return stmtsEnd(c.Stmts, c.Last)
}

// TestClause represents a Bash extended test clause.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type TestClause struct {
	Left, Right Pos

X TestExpr
}

func (t *TestClause) Pos() Pos { return t.Left }
func (t *TestClause) End() Pos { return posAddCol(t.Right, 2) }

// TestExpr represents all nodes that form test expressions.
//
// These are *BinaryTest, *UnaryTest, *ParenTest, and *Word.
type TestExpr interface {
	Node
	testExprNode()
}

func (*BinaryTest) testExprNode() {}
func (*UnaryTest) testExprNode()  {}
func (*ParenTest) testExprNode()  {}
func (*Word) testExprNode()       {}

// BinaryTest represents a binary test expression.
type BinaryTest struct {
	OpPos Pos
	Op    BinTestOperator
	X, Y  TestExpr
}

func (b *BinaryTest) Pos() Pos { return b.X.Pos() }
func (b *BinaryTest) End() Pos { return b.Y.End() }

// UnaryTest represents a unary test expression. The unary opearator may come
// before or after the sub-expression.
type UnaryTest struct {
	OpPos Pos
	Op    UnTestOperator
	X     TestExpr
}

func (u *UnaryTest) Pos() Pos { return u.OpPos }
func (u *UnaryTest) End() Pos { return u.X.End() }

// ParenTest represents a test expression within parentheses.
type ParenTest struct {
	Lparen, Rparen Pos

X TestExpr
}

func (p *ParenTest) Pos() Pos { return p.Lparen }
func (p *ParenTest) End() Pos { return posAddCol(p.Rparen, 1) }

// DeclClause represents a Bash declare clause.
//
// Args can contain a mix of regular and naked assignments. The naked
// assignments can represent either options or variable names.
//
// This node will only appear with LangBash.
type DeclClause struct {
	// Variant is one of "declare", "local", "export", "readonly",
	// "typeset", or "nameref".
	Variant *Lit
	Args    []*Assign
}

func (d *DeclClause) Pos() Pos { return d.Variant.Pos() }
func (d *DeclClause) End() Pos {
	if len(d.Args) > 0 {
		return d.Args[len(d.Args)-1].End()
	}
	return d.Variant.End()
}

// ArrayExpr represents a Bash array expression.
//
// This node will only appear with LangBash.
type ArrayExpr struct {
	Lparen, Rparen Pos

Elems []*ArrayElem
	Last  []Comment
}

func (a *ArrayExpr) Pos() Pos { return a.Lparen }
func (a *ArrayExpr) End() Pos { return posAddCol(a.Rparen, 1) }

// ArrayElem represents a Bash array element.
//
// Index can be nil; for example, declare -a x=(value).
// Value can be nil; for example, declare -A x=([index]=).
// Finally, neither can be nil; for example, declare -A x=([index]=value)
type ArrayElem struct {
	Index    ArithmExpr
	Value    *Word
	Comments []Comment
}

func (a *ArrayElem) Pos() Pos {
	if a.Index != nil {
		return a.Index.Pos()
	}
	return a.Value.Pos()
}

func (a *ArrayElem) End() Pos {
	if a.Value != nil {
		return a.Value.End()
	}
	return posAddCol(a.Index.Pos(), 1)
}

// ExtGlob represents a Bash extended globbing expression. Note that these are
// parsed independently of whether shopt has been called or not.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type ExtGlob struct {
	OpPos   Pos
	Op      GlobOperator
	Pattern *Lit
}

func (e *ExtGlob) Pos() Pos { return e.OpPos }
func (e *ExtGlob) End() Pos { return posAddCol(e.Pattern.End(), 1) }

// ProcSubst represents a Bash process substitution.
//
// This node will only appear with LangBash.
type ProcSubst struct {
	OpPos, Rparen Pos
	Op            ProcOperator

Stmts []*Stmt
	Last  []Comment
}

func (s *ProcSubst) Pos() Pos { return s.OpPos }
func (s *ProcSubst) End() Pos { return posAddCol(s.Rparen, 1) }

// TimeClause represents a Bash time clause. PosixFormat corresponds to the -p
// flag.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type TimeClause struct {
	Time        Pos
	PosixFormat bool
	Stmt        *Stmt
}

func (c *TimeClause) Pos() Pos { return c.Time }
func (c *TimeClause) End() Pos {
	if c.Stmt == nil {
		return posAddCol(c.Time, 4)
	}
	return c.Stmt.End()
}

// CoprocClause represents a Bash coproc clause.
//
// This node will only appear with LangBash.
type CoprocClause struct {
	Coproc Pos
	Name   *Word
	Stmt   *Stmt
}

func (c *CoprocClause) Pos() Pos { return c.Coproc }
func (c *CoprocClause) End() Pos { return c.Stmt.End() }

// LetClause represents a Bash let clause.
//
// This node will only appear in LangBash and LangMirBSDKorn.
type LetClause struct {
	Let   Pos
	Exprs []ArithmExpr
}

func (l *LetClause) Pos() Pos { return l.Let }
func (l *LetClause) End() Pos { return l.Exprs[len(l.Exprs)-1].End() }

// BraceExp represents a Bash brace expression, such as "{a,f}" or "{1..10}".
//
// This node will only appear as a result of SplitBraces.
type BraceExp struct {
	Sequence bool // {x..y[..incr]} instead of {x,y[,...]}
	Elems    []*Word
}

func (b *BraceExp) Pos() Pos {
	return posAddCol(b.Elems[0].Pos(), -1)
}

func (b *BraceExp) End() Pos {
	return posAddCol(wordLastEnd(b.Elems), 1)
}

// TestDecl represents the declaration of a Bats test function.
type TestDecl struct {
	Position    Pos
	Description *Word
	Body        *Stmt
}

func (f *TestDecl) Pos() Pos { return f.Position }
func (f *TestDecl) End() Pos { return f.Body.End() }

func wordLastEnd(ws []*Word) Pos {
	if len(ws) == 0 {
		return Pos{}
	}
	return ws[len(ws)-1].End()
}
0707010000005B000081A4000003E800000064000000016046124D000006A9000000000000000000000000000000000000001E00000000sh-3.2.4/syntax/nodes_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"fmt"
	"strings"
	"testing"
)

func TestPosition(t *testing.T) {
	t.Parallel()
	parserBash := NewParser(KeepComments(true))
	parserPosix := NewParser(KeepComments(true), Variant(LangPOSIX))
	parserMirBSD := NewParser(KeepComments(true), Variant(LangMirBSDKorn))
	parserBats := NewParser(KeepComments(true), Variant(LangBats))
	for i, c := range fileTests {
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j), func(t *testing.T) {
				parser := parserPosix
				if c.Bats != nil {
					parser = parserBats
				} else if c.Bash != nil {
					parser = parserBash
				} else if c.MirBSDKorn != nil {
					parser = parserMirBSD
				}
				prog, err := parser.Parse(strings.NewReader(in), "")
				if err != nil {
					t.Fatalf("Unexpected error in %q: %v", in, err)
				}
				v := &posWalker{
					t:     t,
					f:     prog,
					lines: strings.Split(in, "\n"),
				}
				Walk(prog, v.Visit)
			})
		}
	}
}

type posWalker struct {
	t     *testing.T
	f     *File
	lines []string
}

func (v *posWalker) Visit(n Node) bool {
	if n == nil {
		return true
	}
	p := n.Pos()
	if !p.IsValid() && len(v.f.Stmts) > 0 {
		v.t.Fatalf("Invalid Pos")
	}
	if c, ok := n.(*Comment); ok {
		if v.f.Pos().After(c.Pos()) {
			v.t.Fatalf("A Comment is before its File")
		}
		if c.End().After(v.f.End()) {
			v.t.Fatalf("A Comment is after its File")
		}
	}
	return true
}

func TestWeirdOperatorString(t *testing.T) {
	t.Parallel()
	op := RedirOperator(1000)
	want := "token(1000)"
	if got := op.String(); got != want {
		t.Fatalf("token.String() mismatch: want %s, got %s", want, got)
	}
}
0707010000005C000081A4000003E800000064000000016046124D0000E1E5000000000000000000000000000000000000001A00000000sh-3.2.4/syntax/parser.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bytes"
	"fmt"
	"io"
	"strconv"
	"strings"
	"unicode/utf8"
)

// ParserOption is a function which can be passed to NewParser
// to alter its behaviour. To apply option to existing Parser
// call it directly, for example KeepComments(true)(parser).
type ParserOption func(*Parser)

// KeepComments makes the parser parse comments and attach them to
// nodes, as opposed to discarding them.
func KeepComments(enabled bool) ParserOption {
	return func(p *Parser) { p.keepComments = enabled }
}

// LangVariant describes a shell language variant to use when tokenizing and
// parsing shell code. The zero value is Bash.
type LangVariant int

const (
	// LangBash corresponds to the GNU Bash language, as described in its
	// manual at https://www.gnu.org/software/bash/manual/bash.html.
	//
	// Its string representation is "bash".
	LangBash LangVariant = iota

// LangPOSIX corresponds to the POSIX Shell language, as described at
	// https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html.
	//
	// Its string representation is "posix" or "sh".
	LangPOSIX

// LangMirBSDKorn corresponds to the MirBSD Korn Shell, also known as
	// mksh, as described at http://www.mirbsd.org/htman/i386/man1/mksh.htm.
	// Note that it shares some features with Bash, due to the the shared
	// ancestry that is ksh.
	//
	// Its string representation is "mksh".
	LangMirBSDKorn

// LangBats corresponds to the Bash Automated Testing System language,
	// as described at https://github.com/bats-core/bats-core. Note that
	// it's just a small extension of the Bash language.
	//
	// Its string representation is "bats".
	LangBats
)

// Variant changes the shell language variant that the parser will
// accept.
//
// The passed language variant must be one of the constant values defined in
// this package.
func Variant(l LangVariant) ParserOption {
	switch l {
	case LangBash, LangPOSIX, LangMirBSDKorn, LangBats:
	default:
		panic(fmt.Sprintf("unknown shell language variant: %d", l))
	}
	return func(p *Parser) { p.lang = l }
}

func (l LangVariant) String() string {
	switch l {
	case LangBash:
		return "bash"
	case LangPOSIX:
		return "posix"
	case LangMirBSDKorn:
		return "mksh"
	case LangBats:
		return "bats"
	}
	return "unknown shell language variant"
}

func (l *LangVariant) Set(s string) error {
	switch s {
	case "bash":
		*l = LangBash
	case "posix", "sh":
		*l = LangPOSIX
	case "mksh":
		*l = LangMirBSDKorn
	case "bats":
		*l = LangBats
	default:
		return fmt.Errorf("unknown shell language variant: %q", s)
	}
	return nil
}

func (l LangVariant) isBash() bool {
	return l == LangBash || l == LangBats
}

// StopAt configures the lexer to stop at an arbitrary word, treating it
// as if it were the end of the input. It can contain any characters
// except whitespace, and cannot be over four bytes in size.
//
// This can be useful to embed shell code within another language, as
// one can use a special word to mark the delimiters between the two.
//
// As a word, it will only apply when following whitespace or a
// separating token. For example, StopAt("$$") will act on the inputs
// "foo $$" and "foo;$$", but not on "foo '$$'".
//
// The match is done by prefix, so the example above will also act on
// "foo $$bar".
func StopAt(word string) ParserOption {
	if len(word) > 4 {
		panic("stop word can't be over four bytes in size")
	}
	if strings.ContainsAny(word, " \t\n\r") {
		panic("stop word can't contain whitespace characters")
	}
	return func(p *Parser) { p.stopAt = []byte(word) }
}

// NewParser allocates a new Parser and applies any number of options.
func NewParser(options ...ParserOption) *Parser {
	p := &Parser{}
	for _, opt := range options {
		opt(p)
	}
	return p
}

// Parse reads and parses a shell program with an optional name. It
// returns the parsed program if no issues were encountered. Otherwise,
// an error is returned. Reads from r are buffered.
//
// Parse can be called more than once, but not concurrently. That is, a
// Parser can be reused once it is done working.
func (p *Parser) Parse(r io.Reader, name string) (*File, error) {
	p.reset()
	p.f = &File{Name: name}
	p.src = r
	p.rune()
	p.next()
	p.f.Stmts, p.f.Last = p.stmtList()
	if p.err == nil {
		// EOF immediately after heredoc word so no newline to
		// trigger it
		p.doHeredocs()
	}
	return p.f, p.err
}

// Stmts reads and parses statements one at a time, calling a function
// each time one is parsed. If the function returns false, parsing is
// stopped and the function is not called again.
func (p *Parser) Stmts(r io.Reader, fn func(*Stmt) bool) error {
	p.reset()
	p.f = &File{}
	p.src = r
	p.rune()
	p.next()
	p.stmts(fn)
	if p.err == nil {
		// EOF immediately after heredoc word so no newline to
		// trigger it
		p.doHeredocs()
	}
	return p.err
}

type wrappedReader struct {
	*Parser
	io.Reader

lastLine    uint16
	accumulated []*Stmt
	fn          func([]*Stmt) bool
}

func (w *wrappedReader) Read(p []byte) (n int, err error) {
	// If we lexed a newline for the first time, we just finished a line, so
	// we may need to give a callback for the edge cases below not covered
	// by Parser.Stmts.
	if (w.r == '\n' || w.r == escNewl) && w.npos.line > w.lastLine {
		if w.Incomplete() {
			// Incomplete statement; call back to print "> ".
			if !w.fn(w.accumulated) {
				return 0, io.EOF
			}
		} else if len(w.accumulated) == 0 {
			// Nothing was parsed; call back to print another "$ ".
			if !w.fn(nil) {
				return 0, io.EOF
			}
		}
		w.lastLine = w.npos.line
	}
	return w.Reader.Read(p)
}

// Interactive implements what is necessary to parse statements in an
// interactive shell. The parser will call the given function under two
// circumstances outlined below.
//
// If a line containing any number of statements is parsed, the function will be
// called with said statements.
//
// If a line ending in an incomplete statement is parsed, the function will be
// called with any fully parsed statents, and Parser.Incomplete will return
// true.
//
// One can imagine a simple interactive shell implementation as follows:
//
//         fmt.Fprintf(os.Stdout, "$ ")
//         parser.Interactive(os.Stdin, func(stmts []*syntax.Stmt) bool {
//                 if parser.Incomplete() {
//                         fmt.Fprintf(os.Stdout, "> ")
//                         return true
//                 }
//                 run(stmts)
//                 fmt.Fprintf(os.Stdout, "$ ")
//                 return true
//         }
//
// If the callback function returns false, parsing is stopped and the function
// is not called again.
func (p *Parser) Interactive(r io.Reader, fn func([]*Stmt) bool) error {
	w := wrappedReader{Parser: p, Reader: r, fn: fn}
	return p.Stmts(&w, func(stmt *Stmt) bool {
		w.accumulated = append(w.accumulated, stmt)
		// We finished parsing a statement and we're at a newline token,
		// so we finished fully parsing a number of statements. Call
		// back to run the statements and print "$ ".
		if p.tok == _Newl {
			if !fn(w.accumulated) {
				return false
			}
			w.accumulated = w.accumulated[:0]
			// The callback above would already print "$ ", so we
			// don't want the subsequent wrappedReader.Read to cause
			// another "$ " print thinking that nothing was parsed.
			w.lastLine = w.npos.line + 1
		}
		return true
	})
}

// Words reads and parses words one at a time, calling a function each time one
// is parsed. If the function returns false, parsing is stopped and the function
// is not called again.
//
// Newlines are skipped, meaning that multi-line input will work fine. If the
// parser encounters a token that isn't a word, such as a semicolon, an error
// will be returned.
//
// Note that the lexer doesn't currently tokenize spaces, so it may need to read
// a non-space byte such as a newline or a letter before finishing the parsing
// of a word. This will be fixed in the future.
func (p *Parser) Words(r io.Reader, fn func(*Word) bool) error {
	p.reset()
	p.f = &File{}
	p.src = r
	p.rune()
	p.next()
	for {
		p.got(_Newl)
		w := p.getWord()
		if w == nil {
			if p.tok != _EOF {
				p.curErr("%s is not a valid word", p.tok)
			}
			return p.err
		}
		if !fn(w) {
			return nil
		}
	}
}

// Document parses a single here-document word. That is, it parses the input as
// if they were lines following a <<EOF redirection.
//
// In practice, this is the same as parsing the input as if it were within
// double quotes, but without having to escape all double quote characters.
// Similarly, the here-document word parsed here cannot be ended by any
// delimiter other than reaching the end of the input.
func (p *Parser) Document(r io.Reader) (*Word, error) {
	p.reset()
	p.f = &File{}
	p.src = r
	p.rune()
	p.quote = hdocBody
	p.hdocStops = [][]byte{[]byte("MVDAN_CC_SH_SYNTAX_EOF")}
	p.parsingDoc = true
	p.next()
	w := p.getWord()
	return w, p.err
}

// Arithmetic parses a single arithmetic expression. That is, as if the input
// were within the $(( and )) tokens.
func (p *Parser) Arithmetic(r io.Reader) (ArithmExpr, error) {
	p.reset()
	p.f = &File{}
	p.src = r
	p.rune()
	p.quote = arithmExpr
	p.next()
	expr := p.arithmExpr(false)
	return expr, p.err
}

// Parser holds the internal state of the parsing mechanism of a
// program.
type Parser struct {
	src io.Reader
	bs  []byte // current chunk of read bytes
	bsp int    // pos within chunk for the rune after r
	r   rune   // next rune
	w   uint16 // width of r

f *File

spaced bool // whether tok has whitespace on its left

err     error // lexer/parser error
	readErr error // got a read error, but bytes left

tok token  // current token
	val string // current value (valid if tok is _Lit*)

offs int
	pos  Pos // position of tok
	npos Pos // next position (of r)

// TODO: Guard against offset overflow too. Less likely as it's 32-bit,
	// whereas line and col are 16-bit.
	lineOverflow bool
	colOverflow  bool

quote   quoteState // current lexer state
	eqlOffs int        // position of '=' in val (a literal)

keepComments bool
	lang         LangVariant

stopAt []byte

forbidNested bool

// list of pending heredoc bodies
	buriedHdocs int
	heredocs    []*Redirect

hdocStops [][]byte // stack of end words for open heredocs

parsingDoc bool // true if using Parser.Document

// openStmts is how many entire statements we're currently parsing. A
	// non-zero number means that we require certain tokens or words before
	// reaching EOF.
	openStmts int
	// openBquotes is how many levels of backquotes are open at the moment.
	openBquotes int

// lastBquoteEsc is how many times the last backquote token was escaped
	lastBquoteEsc int
	// buriedBquotes is like openBquotes, but saved for when the parser
	// comes out of single quotes
	buriedBquotes int

rxOpenParens int
	rxFirstPart  bool

accComs []Comment
	curComs *[]Comment

litBatch    []Lit
	wordBatch   []Word
	wpsBatch    []WordPart
	stmtBatch   []Stmt
	stListBatch []*Stmt
	callBatch   []callAlloc

readBuf [bufSize]byte
	litBuf  [bufSize]byte
	litBs   []byte
}

// Incomplete reports whether the parser is waiting to read more bytes because
// it needs to finish properly parsing a statement.
//
// It is only safe to call while the parser is blocked on a read. For an example
// use case, see the documentation for Parser.Interactive.
func (p *Parser) Incomplete() bool {
	// If we're in a quote state other than noState, we're parsing a node
	// such as a double-quoted string.
	// If there are any open statements, we need to finish them.
	// If we're constructing a literal, we need to finish it.
	return p.quote != noState || p.openStmts > 0 || p.litBs != nil
}

const bufSize = 1 << 10

func (p *Parser) reset() {
	p.tok, p.val = illegalTok, ""
	p.eqlOffs = 0
	p.bs, p.bsp = nil, 0
	p.offs = 0
	p.npos = Pos{line: 1, col: 1}
	p.r, p.w = 0, 0
	p.err, p.readErr = nil, nil
	p.quote, p.forbidNested = noState, false
	p.openStmts = 0
	p.heredocs, p.buriedHdocs = p.heredocs[:0], 0
	p.parsingDoc = false
	p.openBquotes, p.buriedBquotes = 0, 0
	p.accComs, p.curComs = nil, &p.accComs
}

func (p *Parser) getPos() Pos {
	pos := p.npos
	if p.lineOverflow {
		pos.line = 0
	}
	if p.colOverflow {
		pos.col = 0
	}
	pos.offs = uint32(p.offs + p.bsp - int(p.w))
	return pos
}

func (p *Parser) lit(pos Pos, val string) *Lit {
	if len(p.litBatch) == 0 {
		p.litBatch = make([]Lit, 128)
	}
	l := &p.litBatch[0]
	p.litBatch = p.litBatch[1:]
	l.ValuePos = pos
	l.ValueEnd = p.getPos()
	l.Value = val
	return l
}

func (p *Parser) word(parts []WordPart) *Word {
	if len(p.wordBatch) == 0 {
		p.wordBatch = make([]Word, 64)
	}
	w := &p.wordBatch[0]
	p.wordBatch = p.wordBatch[1:]
	w.Parts = parts
	return w
}

func (p *Parser) wps(wp WordPart) []WordPart {
	if len(p.wpsBatch) == 0 {
		p.wpsBatch = make([]WordPart, 64)
	}
	wps := p.wpsBatch[:1:1]
	p.wpsBatch = p.wpsBatch[1:]
	wps[0] = wp
	return wps
}

func (p *Parser) stmt(pos Pos) *Stmt {
	if len(p.stmtBatch) == 0 {
		p.stmtBatch = make([]Stmt, 64)
	}
	s := &p.stmtBatch[0]
	p.stmtBatch = p.stmtBatch[1:]
	s.Position = pos
	return s
}

func (p *Parser) stList() []*Stmt {
	if len(p.stListBatch) == 0 {
		p.stListBatch = make([]*Stmt, 256)
	}
	stmts := p.stListBatch[:0:4]
	p.stListBatch = p.stListBatch[4:]
	return stmts
}

type callAlloc struct {
	ce CallExpr
	ws [4]*Word
}

func (p *Parser) call(w *Word) *CallExpr {
	if len(p.callBatch) == 0 {
		p.callBatch = make([]callAlloc, 32)
	}
	alloc := &p.callBatch[0]
	p.callBatch = p.callBatch[1:]
	ce := &alloc.ce
	ce.Args = alloc.ws[:1]
	ce.Args[0] = w
	return ce
}

//go:generate stringer -type=quoteState

type quoteState uint32

const (
	noState quoteState = 1 << iota
	subCmd
	subCmdBckquo
	dblQuotes
	hdocWord
	hdocBody
	hdocBodyTabs
	arithmExpr
	arithmExprLet
	arithmExprCmd
	arithmExprBrack
	testExpr
	testExprRegexp
	switchCase
	paramExpName
	paramExpSlice
	paramExpRepl
	paramExpExp
	arrayElems

type saveState struct {
	quote       quoteState
	buriedHdocs int
}

func (p *Parser) preNested(quote quoteState) (s saveState) {
	s.quote, s.buriedHdocs = p.quote, p.buriedHdocs
	p.buriedHdocs, p.quote = len(p.heredocs), quote
	return
}

func (p *Parser) postNested(s saveState) {
	p.quote, p.buriedHdocs = s.quote, s.buriedHdocs
}

func (p *Parser) unquotedWordBytes(w *Word) ([]byte, bool) {
	var buf bytes.Buffer
	didUnquote := false
	for _, wp := range w.Parts {
		if p.unquotedWordPart(&buf, wp, false) {
			didUnquote = true
		}
	}
	return buf.Bytes(), didUnquote
}

func (p *Parser) unquotedWordPart(buf *bytes.Buffer, wp WordPart, quotes bool) (quoted bool) {
	switch x := wp.(type) {
	case *Lit:
		for i := 0; i < len(x.Value); i++ {
			if b := x.Value[i]; b == '\\' && !quotes {
				if i++; i < len(x.Value) {
					buf.WriteByte(x.Value[i])
				}
				quoted = true
			} else {
				buf.WriteByte(b)
			}
		}
	case *SglQuoted:
		buf.WriteString(x.Value)
		quoted = true
	case *DblQuoted:
		for _, wp2 := range x.Parts {
			p.unquotedWordPart(buf, wp2, true)
		}
		quoted = true
	}
	return
}

func (p *Parser) doHeredocs() {
	hdocs := p.heredocs[p.buriedHdocs:]
	if len(hdocs) == 0 {
		// Nothing do do; don't even issue a read.
		return
	}
	p.rune() // consume '\n', since we know p.tok == _Newl
	old := p.quote
	p.heredocs = p.heredocs[:p.buriedHdocs]
	for i, r := range hdocs {
		if p.err != nil {
			break
		}
		p.quote = hdocBody
		if r.Op == DashHdoc {
			p.quote = hdocBodyTabs
		}
		stop, quoted := p.unquotedWordBytes(r.Word)
		p.hdocStops = append(p.hdocStops, stop)
		if i > 0 && p.r == '\n' {
			p.rune()
		}
		lastLine := p.npos.line
		if quoted {
			r.Hdoc = p.quotedHdocWord()
		} else {
			p.next()
			r.Hdoc = p.getWord()
		}
		if r.Hdoc != nil {
			lastLine = r.Hdoc.End().line
		}
		if lastLine < p.npos.line {
			// TODO: It seems like this triggers more often than it
			// should. Look into it.
			l := p.lit(p.npos, "")
			if r.Hdoc == nil {
				r.Hdoc = p.word(p.wps(l))
			} else {
				r.Hdoc.Parts = append(r.Hdoc.Parts, l)
			}
		}
		if stop := p.hdocStops[len(p.hdocStops)-1]; stop != nil {
			p.posErr(r.Pos(), "unclosed here-document '%s'", stop)
		}
		p.hdocStops = p.hdocStops[:len(p.hdocStops)-1]
	}
	p.quote = old
}

func (p *Parser) got(tok token) bool {
	if p.tok == tok {
		p.next()
		return true
	}
	return false
}

func (p *Parser) gotRsrv(val string) (Pos, bool) {
	pos := p.pos
	if p.tok == _LitWord && p.val == val {
		p.next()
		return pos, true
	}
	return pos, false
}

func readableStr(s string) string {
	// don't quote tokens like & or }
	if s != "" && s[0] >= 'a' && s[0] <= 'z' {
		return strconv.Quote(s)
	}
	return s
}

func (p *Parser) followErr(pos Pos, left, right string) {
	leftStr := readableStr(left)
	p.posErr(pos, "%s must be followed by %s", leftStr, right)
}

func (p *Parser) followErrExp(pos Pos, left string) {
	p.followErr(pos, left, "an expression")
}

func (p *Parser) follow(lpos Pos, left string, tok token) {
	if !p.got(tok) {
		p.followErr(lpos, left, tok.String())
	}
}

func (p *Parser) followRsrv(lpos Pos, left, val string) Pos {
	pos, ok := p.gotRsrv(val)
	if !ok {
		p.followErr(lpos, left, fmt.Sprintf("%q", val))
	}
	return pos
}

func (p *Parser) followStmts(left string, lpos Pos, stops ...string) ([]*Stmt, []Comment) {
	if p.got(semicolon) {
		return nil, nil
	}
	newLine := p.got(_Newl)
	stmts, last := p.stmtList(stops...)
	if len(stmts) < 1 && !newLine {
		p.followErr(lpos, left, "a statement list")
	}
	return stmts, last
}

func (p *Parser) followWordTok(tok token, pos Pos) *Word {
	w := p.getWord()
	if w == nil {
		p.followErr(pos, tok.String(), "a word")
	}
	return w
}

func (p *Parser) stmtEnd(n Node, start, end string) Pos {
	pos, ok := p.gotRsrv(end)
	if !ok {
		p.posErr(n.Pos(), "%s statement must end with %q", start, end)
	}
	return pos
}

func (p *Parser) quoteErr(lpos Pos, quote token) {
	p.posErr(lpos, "reached %s without closing quote %s",
		p.tok.String(), quote)
}

func (p *Parser) matchingErr(lpos Pos, left, right interface{}) {
	p.posErr(lpos, "reached %s without matching %s with %s",
		p.tok.String(), left, right)
}

func (p *Parser) matched(lpos Pos, left, right token) Pos {
	pos := p.pos
	if !p.got(right) {
		p.matchingErr(lpos, left, right)
	}
	return pos
}

func (p *Parser) errPass(err error) {
	if p.err == nil {
		p.err = err
		p.bsp = len(p.bs) + 1
		p.r = utf8.RuneSelf
		p.w = 1
		p.tok = _EOF
	}
}

// IsIncomplete reports whether a Parser error could have been avoided with
// extra input bytes. For example, if an io.EOF was encountered while there was
// an unclosed quote or parenthesis.
func IsIncomplete(err error) bool {
	perr, ok := err.(ParseError)
	return ok && perr.Incomplete
}

// ParseError represents an error found when parsing a source file, from which
// the parser cannot recover.
type ParseError struct {
	Filename string
	Pos
	Text string

Incomplete bool
}

func (e ParseError) Error() string {
	if e.Filename == "" {
		return fmt.Sprintf("%s: %s", e.Pos.String(), e.Text)
	}
	return fmt.Sprintf("%s:%s: %s", e.Filename, e.Pos.String(), e.Text)
}

// LangError is returned when the parser encounters code that is only valid in
// other shell language variants. The error includes what feature is not present
// in the current language variant, and what languages support it.
type LangError struct {
	Filename string
	Pos
	Feature string
	Langs   []LangVariant
}

func (e LangError) Error() string {
	var buf bytes.Buffer
	if e.Filename != "" {
		buf.WriteString(e.Filename + ":")
	}
	buf.WriteString(e.Pos.String() + ": ")
	buf.WriteString(e.Feature)
	if strings.HasSuffix(e.Feature, "s") {
		buf.WriteString(" are a ")
	} else {
		buf.WriteString(" is a ")
	}
	for i, lang := range e.Langs {
		if i > 0 {
			buf.WriteString("/")
		}
		buf.WriteString(lang.String())
	}
	buf.WriteString(" feature")
	return buf.String()
}

func (p *Parser) posErr(pos Pos, format string, a ...interface{}) {
	p.errPass(ParseError{
		Filename:   p.f.Name,
		Pos:        pos,
		Text:       fmt.Sprintf(format, a...),
		Incomplete: p.tok == _EOF && p.Incomplete(),
	})
}

func (p *Parser) curErr(format string, a ...interface{}) {
	p.posErr(p.pos, format, a...)
}

func (p *Parser) langErr(pos Pos, feature string, langs ...LangVariant) {
	p.errPass(LangError{
		Filename: p.f.Name,
		Pos:      pos,
		Feature:  feature,
		Langs:    langs,
	})
}

func (p *Parser) stmts(fn func(*Stmt) bool, stops ...string) {
	gotEnd := true
loop:
	for p.tok != _EOF {
		newLine := p.got(_Newl)
		switch p.tok {
		case _LitWord:
			for _, stop := range stops {
				if p.val == stop {
					break loop
				}
			}
		case rightParen:
			if p.quote == subCmd {
				break loop
			}
		case bckQuote:
			if p.backquoteEnd() {
				break loop
			}
		case dblSemicolon, semiAnd, dblSemiAnd, semiOr:
			if p.quote == switchCase {
				break loop
			}
			p.curErr("%s can only be used in a case clause", p.tok)
		}
		if !newLine && !gotEnd {
			p.curErr("statements must be separated by &, ; or a newline")
		}
		if p.tok == _EOF {
			break
		}
		p.openStmts++
		s := p.getStmt(true, false, false)
		p.openStmts--
		if s == nil {
			p.invalidStmtStart()
			break
		}
		gotEnd = s.Semicolon.IsValid()
		if !fn(s) {
			break
		}
	}
}

func (p *Parser) stmtList(stops ...string) ([]*Stmt, []Comment) {
	var stmts []*Stmt
	var last []Comment
	fn := func(s *Stmt) bool {
		if stmts == nil {
			stmts = p.stList()
		}
		stmts = append(stmts, s)
		return true
	}
	p.stmts(fn, stops...)
	split := len(p.accComs)
	if p.tok == _LitWord && (p.val == "elif" || p.val == "else" || p.val == "fi") {
		// Split the comments, so that any aligned with an opening token
		// get attached to it. For example:
		//
		//     if foo; then
		//         # inside the body
		//     # document the else
		//     else
		//     fi
		// TODO(mvdan): look into deduplicating this with similar logic
		// in caseItems.
		for i := len(p.accComs) - 1; i >= 0; i-- {
			c := p.accComs[i]
			if c.Pos().Col() != p.pos.Col() {
				break
			}
			split = i
		}
	}
	last = p.accComs[:split]
	p.accComs = p.accComs[split:]
	return stmts, last
}

func (p *Parser) invalidStmtStart() {
	switch p.tok {
	case semicolon, and, or, andAnd, orOr:
		p.curErr("%s can only immediately follow a statement", p.tok)
	case rightParen:
		p.curErr("%s can only be used to close a subshell", p.tok)
	default:
		p.curErr("%s is not a valid start for a statement", p.tok)
	}
}

func (p *Parser) getWord() *Word {
	if parts := p.wordParts(); len(parts) > 0 && p.err == nil {
		return p.word(parts)
	}
	return nil
}

func (p *Parser) getLit() *Lit {
	switch p.tok {
	case _Lit, _LitWord, _LitRedir:
		l := p.lit(p.pos, p.val)
		p.next()
		return l
	}
	return nil
}

func (p *Parser) wordParts() (wps []WordPart) {
	for {
		n := p.wordPart()
		if n == nil {
			return
		}
		if wps == nil {
			wps = p.wps(n)
		} else {
			wps = append(wps, n)
		}
		if p.spaced {
			return
		}
	}
}

func (p *Parser) ensureNoNested() {
	if p.forbidNested {
		p.curErr("expansions not allowed in heredoc words")
	}
}

func (p *Parser) wordPart() WordPart {
	switch p.tok {
	case _Lit, _LitWord:
		l := p.lit(p.pos, p.val)
		p.next()
		return l
	case dollBrace:
		p.ensureNoNested()
		switch p.r {
		case '|':
			if p.lang != LangMirBSDKorn {
				p.curErr(`"${|stmts;}" is a mksh feature`)
			}
			fallthrough
		case ' ', '\t', '\n':
			if p.lang != LangMirBSDKorn {
				p.curErr(`"${ stmts;}" is a mksh feature`)
			}
			cs := &CmdSubst{
				Left:     p.pos,
				TempFile: p.r != '|',
				ReplyVar: p.r == '|',
			}
			old := p.preNested(subCmd)
			p.rune() // don't tokenize '|'
			p.next()
			cs.Stmts, cs.Last = p.stmtList("}")
			p.postNested(old)
			pos, ok := p.gotRsrv("}")
			if !ok {
				p.matchingErr(cs.Left, "${", "}")
			}
			cs.Right = pos
			return cs
		default:
			return p.paramExp()
		}
	case dollDblParen, dollBrack:
		p.ensureNoNested()
		left := p.tok
		ar := &ArithmExp{Left: p.pos, Bracket: left == dollBrack}
		var old saveState
		if ar.Bracket {
			old = p.preNested(arithmExprBrack)
		} else {
			old = p.preNested(arithmExpr)
		}
		p.next()
		if p.got(hash) {
			if p.lang != LangMirBSDKorn {
				p.langErr(ar.Pos(), "unsigned expressions", LangMirBSDKorn)
			}
			ar.Unsigned = true
		}
		ar.X = p.followArithm(left, ar.Left)
		if ar.Bracket {
			if p.tok != rightBrack {
				p.arithmMatchingErr(ar.Left, dollBrack, rightBrack)
			}
			p.postNested(old)
			ar.Right = p.pos
			p.next()
		} else {
			ar.Right = p.arithmEnd(dollDblParen, ar.Left, old)
		}
		return ar
	case dollParen:
		p.ensureNoNested()
		cs := &CmdSubst{Left: p.pos}
		old := p.preNested(subCmd)
		p.next()
		cs.Stmts, cs.Last = p.stmtList()
		p.postNested(old)
		cs.Right = p.matched(cs.Left, leftParen, rightParen)
		return cs
	case dollar:
		r := p.r
		switch {
		case singleRuneParam(r):
			p.tok, p.val = _LitWord, string(r)
			p.rune()
		case 'a' <= r && r <= 'z', 'A' <= r && r <= 'Z',
			'0' <= r && r <= '9', r == '_', r == '\\':
			p.advanceNameCont(r)
		default:
			l := p.lit(p.pos, "$")
			p.next()
			return l
		}
		p.ensureNoNested()
		pe := &ParamExp{Dollar: p.pos, Short: true}
		p.pos = posAddCol(p.pos, 1)
		pe.Param = p.getLit()
		if pe.Param != nil && pe.Param.Value == "" {
			l := p.lit(pe.Dollar, "$")
			// e.g. "$\\\"" within double quotes, so we must
			// keep the rest of the literal characters.
			l.ValueEnd = posAddCol(l.ValuePos, 1)
			return l
		}
		return pe
	case cmdIn, cmdOut:
		p.ensureNoNested()
		ps := &ProcSubst{Op: ProcOperator(p.tok), OpPos: p.pos}
		old := p.preNested(subCmd)
		p.next()
		ps.Stmts, ps.Last = p.stmtList()
		p.postNested(old)
		ps.Rparen = p.matched(ps.OpPos, token(ps.Op), rightParen)
		return ps
	case sglQuote, dollSglQuote:
		sq := &SglQuoted{Left: p.pos, Dollar: p.tok == dollSglQuote}
		r := p.r
		for p.newLit(r); ; r = p.rune() {
			switch r {
			case '\\':
				if sq.Dollar {
					p.rune()
				}
			case '\'':
				sq.Right = p.getPos()
				sq.Value = p.endLit()

// restore openBquotes
				p.openBquotes = p.buriedBquotes
				p.buriedBquotes = 0

p.rune()
				p.next()
				return sq
			case escNewl:
				p.litBs = append(p.litBs, '\\', '\n')
			case utf8.RuneSelf:
				p.tok = _EOF
				p.quoteErr(sq.Pos(), sglQuote)
				return nil
			}
		}
	case dblQuote, dollDblQuote:
		if p.quote == dblQuotes {
			// p.tok == dblQuote, as "foo$" puts $ in the lit
			return nil
		}
		return p.dblQuoted()
	case bckQuote:
		if p.backquoteEnd() {
			return nil
		}
		p.ensureNoNested()
		cs := &CmdSubst{Left: p.pos, Backquotes: true}
		old := p.preNested(subCmdBckquo)
		p.openBquotes++

// The lexer didn't call p.rune for us, so that it could have
		// the right p.openBquotes to properly handle backslashes.
		p.rune()

p.next()
		cs.Stmts, cs.Last = p.stmtList()
		if p.tok == bckQuote && p.lastBquoteEsc < p.openBquotes-1 {
			// e.g. found ` before the nested backquote \` was closed.
			p.tok = _EOF
			p.quoteErr(cs.Pos(), bckQuote)
		}
		p.postNested(old)
		p.openBquotes--
		cs.Right = p.pos

// Like above, the lexer didn't call p.rune for us.
		p.rune()
		if !p.got(bckQuote) {
			p.quoteErr(cs.Pos(), bckQuote)
		}
		return cs
	case globQuest, globStar, globPlus, globAt, globExcl:
		if p.lang == LangPOSIX {
			p.langErr(p.pos, "extended globs", LangBash, LangMirBSDKorn)
		}
		eg := &ExtGlob{Op: GlobOperator(p.tok), OpPos: p.pos}
		lparens := 1
		r := p.r
	globLoop:
		for p.newLit(r); ; r = p.rune() {
			switch r {
			case utf8.RuneSelf:
				break globLoop
			case '(':
				lparens++
			case ')':
				if lparens--; lparens == 0 {
					break globLoop
				}
			}
		}
		eg.Pattern = p.lit(posAddCol(eg.OpPos, 2), p.endLit())
		p.rune()
		p.next()
		if lparens != 0 {
			p.matchingErr(eg.OpPos, eg.Op, rightParen)
		}
		return eg
	default:
		return nil
	}
}

func (p *Parser) dblQuoted() *DblQuoted {
	q := &DblQuoted{Left: p.pos, Dollar: p.tok == dollDblQuote}
	old := p.quote
	p.quote = dblQuotes
	p.next()
	q.Parts = p.wordParts()
	p.quote = old
	q.Right = p.pos
	if !p.got(dblQuote) {
		p.quoteErr(q.Pos(), dblQuote)
	}
	return q
}

func singleRuneParam(r rune) bool {
	switch r {
	case '@', '*', '#', '$', '?', '!', '-',
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		return true
	}
	return false
}

func (p *Parser) paramExp() *ParamExp {
	pe := &ParamExp{Dollar: p.pos}
	old := p.quote
	p.quote = paramExpName
	if p.r == '#' {
		p.tok = hash
		p.pos = p.getPos()
		p.rune()
	} else {
		p.next()
	}
	switch p.tok {
	case hash:
		if paramNameOp(p.r) {
			pe.Length = true
			p.next()
		}
	case perc:
		if p.lang != LangMirBSDKorn {
			p.posErr(pe.Pos(), `"${%%foo}" is a mksh feature`)
		}
		if paramNameOp(p.r) {
			pe.Width = true
			p.next()
		}
	case exclMark:
		if paramNameOp(p.r) {
			if p.lang == LangPOSIX {
				p.langErr(p.pos, "${!foo}", LangBash, LangMirBSDKorn)
			}
			pe.Excl = true
			p.next()
		}
	}
	op := p.tok
	switch p.tok {
	case _Lit, _LitWord:
		if !numberLiteral(p.val) && !ValidName(p.val) {
			p.curErr("invalid parameter name")
		}
		pe.Param = p.lit(p.pos, p.val)
		p.next()
	case quest, minus:
		if pe.Length && p.r != '}' {
			// actually ${#-default}, not ${#-}; fix the ambiguity
			pe.Length = false
			pe.Param = p.lit(posAddCol(p.pos, -1), "#")
			pe.Param.ValueEnd = p.pos
			break
		}
		fallthrough
	case at, star, hash, exclMark, dollar:
		pe.Param = p.lit(p.pos, p.tok.String())
		p.next()
	default:
		p.curErr("parameter expansion requires a literal")
	}
	switch p.tok {
	case _Lit, _LitWord:
		p.curErr("%s cannot be followed by a word", op)
	case rightBrace:
		pe.Rbrace = p.pos
		p.quote = old
		p.next()
		return pe
	case leftBrack:
		if p.lang == LangPOSIX {
			p.langErr(p.pos, "arrays", LangBash, LangMirBSDKorn)
		}
		if !ValidName(pe.Param.Value) {
			p.curErr("cannot index a special parameter name")
		}
		pe.Index = p.eitherIndex()
	}
	if p.tok == rightBrace {
		pe.Rbrace = p.pos
		p.quote = old
		p.next()
		return pe
	}
	if p.tok != _EOF && (pe.Length || pe.Width) {
		p.curErr("cannot combine multiple parameter expansion operators")
	}
	switch p.tok {
	case slash, dblSlash:
		// pattern search and replace
		if p.lang == LangPOSIX {
			p.langErr(p.pos, "search and replace", LangBash, LangMirBSDKorn)
		}
		pe.Repl = &Replace{All: p.tok == dblSlash}
		p.quote = paramExpRepl
		p.next()
		pe.Repl.Orig = p.getWord()
		p.quote = paramExpExp
		if p.got(slash) {
			pe.Repl.With = p.getWord()
		}
	case colon:
		// slicing
		if p.lang == LangPOSIX {
			p.langErr(p.pos, "slicing", LangBash, LangMirBSDKorn)
		}
		pe.Slice = &Slice{}
		colonPos := p.pos
		p.quote = paramExpSlice
		if p.next(); p.tok != colon {
			pe.Slice.Offset = p.followArithm(colon, colonPos)
		}
		colonPos = p.pos
		if p.got(colon) {
			pe.Slice.Length = p.followArithm(colon, colonPos)
		}
		// Need to use a different matched style so arithm errors
		// get reported correctly
		p.quote = old
		pe.Rbrace = p.pos
		p.matchedArithm(pe.Dollar, dollBrace, rightBrace)
		return pe
	case caret, dblCaret, comma, dblComma:
		// upper/lower case
		if !p.lang.isBash() {
			p.langErr(p.pos, "this expansion operator", LangBash)
		}
		pe.Exp = p.paramExpExp()
	case at, star:
		switch {
		case p.tok == at && p.lang == LangPOSIX:
			p.langErr(p.pos, "this expansion operator", LangBash, LangMirBSDKorn)
		case p.tok == star && !pe.Excl:
			p.curErr("not a valid parameter expansion operator: %v", p.tok)
		case pe.Excl && p.r == '}':
			pe.Names = ParNamesOperator(p.tok)
			p.next()
		default:
			pe.Exp = p.paramExpExp()
		}
	case plus, colPlus, minus, colMinus, quest, colQuest, assgn, colAssgn,
		perc, dblPerc, hash, dblHash:
		pe.Exp = p.paramExpExp()
	case _EOF:
	default:
		p.curErr("not a valid parameter expansion operator: %v", p.tok)
	}
	p.quote = old
	pe.Rbrace = p.pos
	p.matched(pe.Dollar, dollBrace, rightBrace)
	return pe
}

func (p *Parser) paramExpExp() *Expansion {
	op := ParExpOperator(p.tok)
	p.quote = paramExpExp
	p.next()
	if op == OtherParamOps {
		switch p.tok {
		case _Lit, _LitWord:
		default:
			p.curErr("@ expansion operator requires a literal")
		}
		switch p.val {
		case "Q", "E", "P", "A", "a":
		default:
			p.curErr("invalid @ expansion operator")
		}
	}
	return &Expansion{Op: op, Word: p.getWord()}
}

func (p *Parser) eitherIndex() ArithmExpr {
	old := p.quote
	lpos := p.pos
	p.quote = arithmExprBrack
	p.next()
	if p.tok == star || p.tok == at {
		p.tok, p.val = _LitWord, p.tok.String()
	}
	expr := p.followArithm(leftBrack, lpos)
	p.quote = old
	p.matchedArithm(lpos, leftBrack, rightBrack)
	return expr
}

func stopToken(tok token) bool {
	switch tok {
	case _EOF, _Newl, semicolon, and, or, andAnd, orOr, orAnd, dblSemicolon,
		semiAnd, dblSemiAnd, semiOr, rightParen:
		return true
	}
	return false
}

func (p *Parser) backquoteEnd() bool {
	return p.quote == subCmdBckquo && p.lastBquoteEsc < p.openBquotes
}

// ValidName returns whether val is a valid name as per the POSIX spec.
func ValidName(val string) bool {
	if val == "" {
		return false
	}
	for i, r := range val {
		switch {
		case 'a' <= r && r <= 'z':
		case 'A' <= r && r <= 'Z':
		case r == '_':
		case i > 0 && '0' <= r && r <= '9':
		default:
			return false
		}
	}
	return true
}

func numberLiteral(val string) bool {
	for _, r := range val {
		if '0' > r || r > '9' {
			return false
		}
	}
	return true
}

func (p *Parser) hasValidIdent() bool {
	if p.tok != _Lit && p.tok != _LitWord {
		return false
	}
	if end := p.eqlOffs; end > 0 {
		if p.val[end-1] == '+' && p.lang != LangPOSIX {
			end-- // a+=x
		}
		if ValidName(p.val[:end]) {
			return true
		}
	} else if !ValidName(p.val) {
		return false // *[i]=x
	}
	return p.r == '[' // a[i]=x
}

func (p *Parser) getAssign(needEqual bool) *Assign {
	as := &Assign{}
	if p.eqlOffs > 0 { // foo=bar
		nameEnd := p.eqlOffs
		if p.lang != LangPOSIX && p.val[p.eqlOffs-1] == '+' {
			// a+=b
			as.Append = true
			nameEnd--
		}
		as.Name = p.lit(p.pos, p.val[:nameEnd])
		// since we're not using the entire p.val
		as.Name.ValueEnd = posAddCol(as.Name.ValuePos, nameEnd)
		left := p.lit(posAddCol(p.pos, 1), p.val[p.eqlOffs+1:])
		if left.Value != "" {
			left.ValuePos = posAddCol(left.ValuePos, p.eqlOffs)
			as.Value = p.word(p.wps(left))
		}
		p.next()
	} else { // foo[x]=bar
		as.Name = p.lit(p.pos, p.val)
		// hasValidIdent already checks p.r is '['
		p.rune()
		p.pos = posAddCol(p.pos, 1)
		as.Index = p.eitherIndex()
		if p.spaced || stopToken(p.tok) {
			if needEqual {
				p.followErr(as.Pos(), "a[b]", "=")
			} else {
				as.Naked = true
				return as
			}
		}
		if len(p.val) > 0 && p.val[0] == '+' {
			as.Append = true
			p.val = p.val[1:]
			p.pos = posAddCol(p.pos, 1)
		}
		if len(p.val) < 1 || p.val[0] != '=' {
			if as.Append {
				p.followErr(as.Pos(), "a[b]+", "=")
			} else {
				p.followErr(as.Pos(), "a[b]", "=")
			}
			return nil
		}
		p.pos = posAddCol(p.pos, 1)
		p.val = p.val[1:]
		if p.val == "" {
			p.next()
		}
	}
	if p.spaced || stopToken(p.tok) {
		return as
	}
	if as.Value == nil && p.tok == leftParen {
		if p.lang == LangPOSIX {
			p.langErr(p.pos, "arrays", LangBash, LangMirBSDKorn)
		}
		if as.Index != nil {
			p.curErr("arrays cannot be nested")
		}
		as.Array = &ArrayExpr{Lparen: p.pos}
		newQuote := p.quote
		if p.lang.isBash() {
			newQuote = arrayElems
		}
		old := p.preNested(newQuote)
		p.next()
		p.got(_Newl)
		for p.tok != _EOF && p.tok != rightParen {
			ae := &ArrayElem{}
			ae.Comments, p.accComs = p.accComs, nil
			if p.tok == leftBrack {
				left := p.pos
				ae.Index = p.eitherIndex()
				p.follow(left, `"[x]"`, assgn)
			}
			if ae.Value = p.getWord(); ae.Value == nil {
				switch p.tok {
				case leftParen:
					p.curErr("arrays cannot be nested")
					return nil
				case _Newl, rightParen, leftBrack:
					// TODO: support [index]=[
				default:
					p.curErr("array element values must be words")
					return nil
				}
			}
			if len(p.accComs) > 0 {
				c := p.accComs[0]
				if c.Pos().Line() == ae.End().Line() {
					ae.Comments = append(ae.Comments, c)
					p.accComs = p.accComs[1:]
				}
			}
			as.Array.Elems = append(as.Array.Elems, ae)
			p.got(_Newl)
		}
		as.Array.Last, p.accComs = p.accComs, nil
		p.postNested(old)
		as.Array.Rparen = p.matched(as.Array.Lparen, leftParen, rightParen)
	} else if w := p.getWord(); w != nil {
		if as.Value == nil {
			as.Value = w
		} else {
			as.Value.Parts = append(as.Value.Parts, w.Parts...)
		}
	}
	return as
}

func (p *Parser) peekRedir() bool {
	switch p.tok {
	case rdrOut, appOut, rdrIn, dplIn, dplOut, clbOut, rdrInOut,
		hdoc, dashHdoc, wordHdoc, rdrAll, appAll, _LitRedir:
		return true
	}
	return false
}

func (p *Parser) doRedirect(s *Stmt) {
	var r *Redirect
	if s.Redirs == nil {
		var alloc struct {
			redirs [4]*Redirect
			redir  Redirect
		}
		s.Redirs = alloc.redirs[:0]
		r = &alloc.redir
		s.Redirs = append(s.Redirs, r)
	} else {
		r = &Redirect{}
		s.Redirs = append(s.Redirs, r)
	}
	r.N = p.getLit()
	if !p.lang.isBash() && r.N != nil && r.N.Value[0] == '{' {
		p.langErr(r.N.Pos(), "{varname} redirects", LangBash)
	}
	r.Op, r.OpPos = RedirOperator(p.tok), p.pos
	p.next()
	switch r.Op {
	case Hdoc, DashHdoc:
		old := p.quote
		p.quote, p.forbidNested = hdocWord, true
		p.heredocs = append(p.heredocs, r)
		r.Word = p.followWordTok(token(r.Op), r.OpPos)
		p.quote, p.forbidNested = old, false
		if p.tok == _Newl {
			if len(p.accComs) > 0 {
				c := p.accComs[0]
				if c.Pos().Line() == s.End().Line() {
					s.Comments = append(s.Comments, c)
					p.accComs = p.accComs[1:]
				}
			}
			p.doHeredocs()
		}
	default:
		r.Word = p.followWordTok(token(r.Op), r.OpPos)
	}
}

func (p *Parser) getStmt(readEnd, binCmd, fnBody bool) *Stmt {
	pos, ok := p.gotRsrv("!")
	s := p.stmt(pos)
	if ok {
		s.Negated = true
		if stopToken(p.tok) {
			p.posErr(s.Pos(), `"!" cannot form a statement alone`)
		}
		if _, ok := p.gotRsrv("!"); ok {
			p.posErr(s.Pos(), `cannot negate a command multiple times`)
		}
	}
	if s = p.gotStmtPipe(s, false); s == nil || p.err != nil {
		return nil
	}
	// instead of using recursion, iterate manually
	for p.tok == andAnd || p.tok == orOr {
		if binCmd {
			// left associativity: in a list of BinaryCmds, the
			// right recursion should only read a single element
			return s
		}
		b := &BinaryCmd{
			OpPos: p.pos,
			Op:    BinCmdOperator(p.tok),
			X:     s,
		}
		p.next()
		p.got(_Newl)
		b.Y = p.getStmt(false, true, false)
		if b.Y == nil || p.err != nil {
			p.followErr(b.OpPos, b.Op.String(), "a statement")
			return nil
		}
		s = p.stmt(s.Position)
		s.Cmd = b
		s.Comments, b.X.Comments = b.X.Comments, nil
	}
	if readEnd {
		switch p.tok {
		case semicolon:
			s.Semicolon = p.pos
			p.next()
		case and:
			s.Semicolon = p.pos
			p.next()
			s.Background = true
		case orAnd:
			s.Semicolon = p.pos
			p.next()
			s.Coprocess = true
		}
	}
	if len(p.accComs) > 0 && !binCmd && !fnBody {
		c := p.accComs[0]
		if c.Pos().Line() == s.End().Line() {
			s.Comments = append(s.Comments, c)
			p.accComs = p.accComs[1:]
		}
	}
	return s
}

func (p *Parser) gotStmtPipe(s *Stmt, binCmd bool) *Stmt {
	s.Comments, p.accComs = p.accComs, nil
	switch p.tok {
	case _LitWord:
		switch p.val {
		case "{":
			p.block(s)
		case "if":
			p.ifClause(s)
		case "while", "until":
			p.whileClause(s, p.val == "until")
		case "for":
			p.forClause(s)
		case "case":
			p.caseClause(s)
		case "}":
			p.curErr(`%q can only be used to close a block`, p.val)
		case "then":
			p.curErr(`%q can only be used in an if`, p.val)
		case "elif":
			p.curErr(`%q can only be used in an if`, p.val)
		case "fi":
			p.curErr(`%q can only be used to end an if`, p.val)
		case "do":
			p.curErr(`%q can only be used in a loop`, p.val)
		case "done":
			p.curErr(`%q can only be used to end a loop`, p.val)
		case "esac":
			p.curErr(`%q can only be used to end a case`, p.val)
		case "!":
			if !s.Negated {
				p.curErr(`"!" can only be used in full statements`)
				break
			}
		case "[[":
			if p.lang != LangPOSIX {
				p.testClause(s)
			}
		case "]]":
			if p.lang != LangPOSIX {
				p.curErr(`%q can only be used to close a test`,
					p.val)
			}
		case "let":
			if p.lang != LangPOSIX {
				p.letClause(s)
			}
		case "function":
			if p.lang != LangPOSIX {
				p.bashFuncDecl(s)
			}
		case "declare":
			if p.lang.isBash() {
				p.declClause(s)
			}
		case "local", "export", "readonly", "typeset", "nameref":
			if p.lang != LangPOSIX {
				p.declClause(s)
			}
		case "time":
			if p.lang != LangPOSIX {
				p.timeClause(s)
			}
		case "coproc":
			if p.lang.isBash() {
				p.coprocClause(s)
			}
		case "select":
			if p.lang != LangPOSIX {
				p.selectClause(s)
			}
		case "@test":
			if p.lang == LangBats {
				p.testDecl(s)
			}
		}
		if s.Cmd != nil {
			break
		}
		if p.hasValidIdent() {
			p.callExpr(s, nil, true)
			break
		}
		name := p.lit(p.pos, p.val)
		if p.next(); p.got(leftParen) {
			p.follow(name.ValuePos, "foo(", rightParen)
			if p.lang == LangPOSIX && !ValidName(name.Value) {
				p.posErr(name.Pos(), "invalid func name")
			}
			p.funcDecl(s, name, name.ValuePos, true)
		} else {
			p.callExpr(s, p.word(p.wps(name)), false)
		}
	case rdrOut, appOut, rdrIn, dplIn, dplOut, clbOut, rdrInOut,
		hdoc, dashHdoc, wordHdoc, rdrAll, appAll, _LitRedir:
		p.doRedirect(s)
		p.callExpr(s, nil, false)
	case bckQuote:
		if p.backquoteEnd() {
			return nil
		}
		fallthrough
	case _Lit, dollBrace, dollDblParen, dollParen, dollar, cmdIn, cmdOut,
		sglQuote, dollSglQuote, dblQuote, dollDblQuote, dollBrack,
		globQuest, globStar, globPlus, globAt, globExcl:
		if p.hasValidIdent() {
			p.callExpr(s, nil, true)
			break
		}
		w := p.word(p.wordParts())
		if p.got(leftParen) {
			p.posErr(w.Pos(), "invalid func name")
		}
		p.callExpr(s, w, false)
	case leftParen:
		p.subshell(s)
	case dblLeftParen:
		p.arithmExpCmd(s)
	default:
		if len(s.Redirs) == 0 {
			return nil
		}
	}
	for p.peekRedir() {
		p.doRedirect(s)
	}
	// instead of using recursion, iterate manually
	for p.tok == or || p.tok == orAnd {
		if binCmd {
			// left associativity: in a list of BinaryCmds, the
			// right recursion should only read a single element
			return s
		}
		if p.tok == orAnd && p.lang == LangMirBSDKorn {
			// No need to check for LangPOSIX, as on that language
			// we parse |& as two tokens.
			break
		}
		b := &BinaryCmd{OpPos: p.pos, Op: BinCmdOperator(p.tok), X: s}
		p.next()
		p.got(_Newl)
		if b.Y = p.gotStmtPipe(p.stmt(p.pos), true); b.Y == nil || p.err != nil {
			p.followErr(b.OpPos, b.Op.String(), "a statement")
			break
		}
		s = p.stmt(s.Position)
		s.Cmd = b
		s.Comments, b.X.Comments = b.X.Comments, nil
		// in "! x | y", the bang applies to the entire pipeline
		s.Negated = b.X.Negated
		b.X.Negated = false
	}
	return s
}

func (p *Parser) subshell(s *Stmt) {
	sub := &Subshell{Lparen: p.pos}
	old := p.preNested(subCmd)
	p.next()
	sub.Stmts, sub.Last = p.stmtList()
	p.postNested(old)
	sub.Rparen = p.matched(sub.Lparen, leftParen, rightParen)
	s.Cmd = sub
}

func (p *Parser) arithmExpCmd(s *Stmt) {
	ar := &ArithmCmd{Left: p.pos}
	old := p.preNested(arithmExprCmd)
	p.next()
	if p.got(hash) {
		if p.lang != LangMirBSDKorn {
			p.langErr(ar.Pos(), "unsigned expressions", LangMirBSDKorn)
		}
		ar.Unsigned = true
	}
	ar.X = p.followArithm(dblLeftParen, ar.Left)
	ar.Right = p.arithmEnd(dblLeftParen, ar.Left, old)
	s.Cmd = ar
}

func (p *Parser) block(s *Stmt) {
	b := &Block{Lbrace: p.pos}
	p.next()
	b.Stmts, b.Last = p.stmtList("}")
	pos, ok := p.gotRsrv("}")
	b.Rbrace = pos
	if !ok {
		p.matchingErr(b.Lbrace, "{", "}")
	}
	s.Cmd = b
}

func (p *Parser) ifClause(s *Stmt) {
	rootIf := &IfClause{Position: p.pos}
	p.next()
	rootIf.Cond, rootIf.CondLast = p.followStmts("if", rootIf.Position, "then")
	rootIf.ThenPos = p.followRsrv(rootIf.Position, "if <cond>", "then")
	rootIf.Then, rootIf.ThenLast = p.followStmts("then", rootIf.ThenPos, "fi", "elif", "else")
	curIf := rootIf
	for p.tok == _LitWord && p.val == "elif" {
		elf := &IfClause{Position: p.pos}
		curIf.Last = p.accComs
		p.accComs = nil
		p.next()
		elf.Cond, elf.CondLast = p.followStmts("elif", elf.Position, "then")
		elf.ThenPos = p.followRsrv(elf.Position, "elif <cond>", "then")
		elf.Then, elf.ThenLast = p.followStmts("then", elf.ThenPos, "fi", "elif", "else")
		curIf.Else = elf
		curIf = elf
	}
	if elsePos, ok := p.gotRsrv("else"); ok {
		curIf.Last = p.accComs
		p.accComs = nil
		els := &IfClause{Position: elsePos}
		els.Then, els.ThenLast = p.followStmts("else", els.Position, "fi")
		curIf.Else = els
		curIf = els
	}
	curIf.Last = p.accComs
	p.accComs = nil
	rootIf.FiPos = p.stmtEnd(rootIf, "if", "fi")
	for els := rootIf.Else; els != nil; els = els.Else {
		// All the nested IfClauses share the same FiPos.
		els.FiPos = rootIf.FiPos
	}
	s.Cmd = rootIf
}

func (p *Parser) whileClause(s *Stmt, until bool) {
	wc := &WhileClause{WhilePos: p.pos, Until: until}
	rsrv := "while"
	rsrvCond := "while <cond>"
	if wc.Until {
		rsrv = "until"
		rsrvCond = "until <cond>"
	}
	p.next()
	wc.Cond, wc.CondLast = p.followStmts(rsrv, wc.WhilePos, "do")
	wc.DoPos = p.followRsrv(wc.WhilePos, rsrvCond, "do")
	wc.Do, wc.DoLast = p.followStmts("do", wc.DoPos, "done")
	wc.DonePos = p.stmtEnd(wc, rsrv, "done")
	s.Cmd = wc
}

func (p *Parser) forClause(s *Stmt) {
	fc := &ForClause{ForPos: p.pos}
	p.next()
	fc.Loop = p.loop(fc.ForPos)

start, end := "do", "done"
	if pos, ok := p.gotRsrv("{"); ok {
		if p.lang == LangPOSIX {
			p.langErr(pos, "for loops with braces", LangBash, LangMirBSDKorn)
		}
		fc.DoPos = pos
		fc.Braces = true
		start, end = "{", "}"
	} else {
		fc.DoPos = p.followRsrv(fc.ForPos, "for foo [in words]", start)
	}

s.Comments = append(s.Comments, p.accComs...)
	p.accComs = nil
	fc.Do, fc.DoLast = p.followStmts(start, fc.DoPos, end)
	fc.DonePos = p.stmtEnd(fc, "for", end)
	s.Cmd = fc
}

func (p *Parser) loop(fpos Pos) Loop {
	if !p.lang.isBash() {
		switch p.tok {
		case leftParen, dblLeftParen:
			p.langErr(p.pos, "c-style fors", LangBash)
		}
	}
	if p.tok == dblLeftParen {
		cl := &CStyleLoop{Lparen: p.pos}
		old := p.preNested(arithmExprCmd)
		p.next()
		cl.Init = p.arithmExpr(false)
		if !p.got(dblSemicolon) {
			p.follow(p.pos, "expr", semicolon)
			cl.Cond = p.arithmExpr(false)
			p.follow(p.pos, "expr", semicolon)
		}
		cl.Post = p.arithmExpr(false)
		cl.Rparen = p.arithmEnd(dblLeftParen, cl.Lparen, old)
		p.got(semicolon)
		p.got(_Newl)
		return cl
	}
	return p.wordIter("for", fpos)
}

func (p *Parser) wordIter(ftok string, fpos Pos) *WordIter {
	wi := &WordIter{}
	if wi.Name = p.getLit(); wi.Name == nil {
		p.followErr(fpos, ftok, "a literal")
	}
	if p.got(semicolon) {
		p.got(_Newl)
		return wi
	}
	p.got(_Newl)
	if pos, ok := p.gotRsrv("in"); ok {
		wi.InPos = pos
		for !stopToken(p.tok) {
			if w := p.getWord(); w == nil {
				p.curErr("word list can only contain words")
			} else {
				wi.Items = append(wi.Items, w)
			}
		}
		p.got(semicolon)
		p.got(_Newl)
	} else if p.tok == _LitWord && p.val == "do" {
	} else {
		p.followErr(fpos, ftok+" foo", `"in", "do", ;, or a newline`)
	}
	return wi
}

func (p *Parser) selectClause(s *Stmt) {
	fc := &ForClause{ForPos: p.pos, Select: true}
	p.next()
	fc.Loop = p.wordIter("select", fc.ForPos)
	fc.DoPos = p.followRsrv(fc.ForPos, "select foo [in words]", "do")
	fc.Do, fc.DoLast = p.followStmts("do", fc.DoPos, "done")
	fc.DonePos = p.stmtEnd(fc, "select", "done")
	s.Cmd = fc
}

func (p *Parser) caseClause(s *Stmt) {
	cc := &CaseClause{Case: p.pos}
	p.next()
	cc.Word = p.getWord()
	if cc.Word == nil {
		p.followErr(cc.Case, "case", "a word")
	}
	end := "esac"
	p.got(_Newl)
	if pos, ok := p.gotRsrv("{"); ok {
		cc.In = pos
		cc.Braces = true
		if p.lang != LangMirBSDKorn {
			p.posErr(cc.Pos(), `"case i {" is a mksh feature`)
		}
		end = "}"
	} else {
		cc.In = p.followRsrv(cc.Case, "case x", "in")
	}
	cc.Items = p.caseItems(end)
	cc.Last, p.accComs = p.accComs, nil
	cc.Esac = p.stmtEnd(cc, "case", end)
	s.Cmd = cc
}

func (p *Parser) caseItems(stop string) (items []*CaseItem) {
	p.got(_Newl)
	for p.tok != _EOF && !(p.tok == _LitWord && p.val == stop) {
		ci := &CaseItem{}
		ci.Comments, p.accComs = p.accComs, nil
		p.got(leftParen)
		for p.tok != _EOF {
			if w := p.getWord(); w == nil {
				p.curErr("case patterns must consist of words")
			} else {
				ci.Patterns = append(ci.Patterns, w)
			}
			if p.tok == rightParen {
				break
			}
			if !p.got(or) {
				p.curErr("case patterns must be separated with |")
			}
		}
		old := p.preNested(switchCase)
		p.next()
		ci.Stmts, ci.Last = p.stmtList(stop)
		p.postNested(old)
		switch p.tok {
		case dblSemicolon, semiAnd, dblSemiAnd, semiOr:
		default:
			ci.Op = Break
			items = append(items, ci)
			return
		}
		ci.Last = append(ci.Last, p.accComs...)
		p.accComs = nil
		ci.OpPos = p.pos
		ci.Op = CaseOperator(p.tok)
		p.next()
		p.got(_Newl)
		split := len(p.accComs)
		if p.tok == _LitWord && p.val != stop {
			for i := len(p.accComs) - 1; i >= 0; i-- {
				c := p.accComs[i]
				if c.Pos().Col() != p.pos.Col() {
					break
				}
				split = i
			}
		}
		ci.Comments = append(ci.Comments, p.accComs[:split]...)
		p.accComs = p.accComs[split:]
		items = append(items, ci)
	}
	return
}

func (p *Parser) testClause(s *Stmt) {
	tc := &TestClause{Left: p.pos}
	old := p.preNested(testExpr)
	p.next()
	if _, ok := p.gotRsrv("]]"); ok || p.tok == _EOF {
		p.posErr(tc.Left, "test clause requires at least one expression")
	}
	tc.X = p.testExpr(dblLeftBrack, tc.Left, false)
	if tc.X == nil {
		p.followErrExp(tc.Left, "[[")
	}
	tc.Right = p.pos
	if _, ok := p.gotRsrv("]]"); !ok {
		p.matchingErr(tc.Left, "[[", "]]")
	}
	p.postNested(old)
	s.Cmd = tc
}

func (p *Parser) testExpr(ftok token, fpos Pos, pastAndOr bool) TestExpr {
	p.got(_Newl)
	var left TestExpr
	if pastAndOr {
		left = p.testExprBase(ftok, fpos)
	} else {
		left = p.testExpr(ftok, fpos, true)
	}
	if left == nil {
		return left
	}
	p.got(_Newl)
	switch p.tok {
	case andAnd, orOr:
	case _LitWord:
		if p.val == "]]" {
			return left
		}
		if p.tok = token(testBinaryOp(p.val)); p.tok == illegalTok {
			p.curErr("not a valid test operator: %s", p.val)
		}
	case rdrIn, rdrOut:
	case _EOF, rightParen:
		return left
	case _Lit:
		p.curErr("test operator words must consist of a single literal")
	default:
		p.curErr("not a valid test operator: %v", p.tok)
	}
	b := &BinaryTest{
		OpPos: p.pos,
		Op:    BinTestOperator(p.tok),
		X:     left,
	}
	// Save the previous quoteState, since we change it in TsReMatch.
	oldQuote := p.quote

switch b.Op {
	case AndTest, OrTest:
		p.next()
		if b.Y = p.testExpr(token(b.Op), b.OpPos, false); b.Y == nil {
			p.followErrExp(b.OpPos, b.Op.String())
		}
	case TsReMatch:
		if !p.lang.isBash() {
			p.langErr(p.pos, "regex tests", LangBash)
		}
		p.rxOpenParens = 0
		p.rxFirstPart = true
		// TODO(mvdan): Using nested states within a regex will break in
		// all sorts of ways. The better fix is likely to use a stop
		// token, like we do with heredocs.
		p.quote = testExprRegexp
		fallthrough
	default:
		if _, ok := b.X.(*Word); !ok {
			p.posErr(b.OpPos, "expected %s, %s or %s after complex expr",
				AndTest, OrTest, "]]")
		}
		p.next()
		b.Y = p.followWordTok(token(b.Op), b.OpPos)
	}
	p.quote = oldQuote
	return b
}

func (p *Parser) testExprBase(ftok token, fpos Pos) TestExpr {
	switch p.tok {
	case _EOF, rightParen:
		return nil
	case _LitWord:
		op := token(testUnaryOp(p.val))
		switch op {
		case illegalTok:
		case tsRefVar, tsModif: // not available in mksh
			if p.lang.isBash() {
				p.tok = op
			}
		default:
			p.tok = op
		}
	}
	switch p.tok {
	case exclMark:
		u := &UnaryTest{OpPos: p.pos, Op: TsNot}
		p.next()
		if u.X = p.testExpr(token(u.Op), u.OpPos, false); u.X == nil {
			p.followErrExp(u.OpPos, u.Op.String())
		}
		return u
	case tsExists, tsRegFile, tsDirect, tsCharSp, tsBlckSp, tsNmPipe,
		tsSocket, tsSmbLink, tsSticky, tsGIDSet, tsUIDSet, tsGrpOwn,
		tsUsrOwn, tsModif, tsRead, tsWrite, tsExec, tsNoEmpty,
		tsFdTerm, tsEmpStr, tsNempStr, tsOptSet, tsVarSet, tsRefVar:
		u := &UnaryTest{OpPos: p.pos, Op: UnTestOperator(p.tok)}
		p.next()
		u.X = p.followWordTok(token(u.Op), u.OpPos)
		return u
	case leftParen:
		pe := &ParenTest{Lparen: p.pos}
		p.next()
		if pe.X = p.testExpr(leftParen, pe.Lparen, false); pe.X == nil {
			p.followErrExp(pe.Lparen, "(")
		}
		pe.Rparen = p.matched(pe.Lparen, leftParen, rightParen)
		return pe
	case _LitWord:
		if p.val == "]]" {
			return nil
		}
		fallthrough
	default:
		if w := p.getWord(); w != nil {
			return w
		}
		// otherwise we'd return a typed nil above
		return nil
	}
}

func (p *Parser) declClause(s *Stmt) {
	ds := &DeclClause{Variant: p.lit(p.pos, p.val)}
	p.next()
	for !stopToken(p.tok) && !p.peekRedir() {
		if p.hasValidIdent() {
			ds.Args = append(ds.Args, p.getAssign(false))
		} else if p.eqlOffs > 0 {
			p.curErr("invalid var name")
		} else if p.tok == _LitWord && ValidName(p.val) {
			ds.Args = append(ds.Args, &Assign{
				Naked: true,
				Name:  p.getLit(),
			})
		} else if w := p.getWord(); w != nil {
			ds.Args = append(ds.Args, &Assign{
				Naked: true,
				Value: w,
			})
		} else {
			p.followErr(p.pos, ds.Variant.Value, "names or assignments")
		}
	}
	s.Cmd = ds
}

func isBashCompoundCommand(tok token, val string) bool {
	switch tok {
	case leftParen, dblLeftParen:
		return true
	case _LitWord:
		switch val {
		case "{", "if", "while", "until", "for", "case", "[[",
			"coproc", "let", "function", "declare", "local",
			"export", "readonly", "typeset", "nameref":
			return true
		}
	}
	return false
}

func (p *Parser) timeClause(s *Stmt) {
	tc := &TimeClause{Time: p.pos}
	p.next()
	if _, ok := p.gotRsrv("-p"); ok {
		tc.PosixFormat = true
	}
	tc.Stmt = p.gotStmtPipe(p.stmt(p.pos), false)
	s.Cmd = tc
}

func (p *Parser) coprocClause(s *Stmt) {
	cc := &CoprocClause{Coproc: p.pos}
	if p.next(); isBashCompoundCommand(p.tok, p.val) {
		// has no name
		cc.Stmt = p.gotStmtPipe(p.stmt(p.pos), false)
		s.Cmd = cc
		return
	}
	cc.Name = p.getWord()
	cc.Stmt = p.gotStmtPipe(p.stmt(p.pos), false)
	if cc.Stmt == nil {
		if cc.Name == nil {
			p.posErr(cc.Coproc, "coproc clause requires a command")
			return
		}
		// name was in fact the stmt
		cc.Stmt = p.stmt(cc.Name.Pos())
		cc.Stmt.Cmd = p.call(cc.Name)
		cc.Name = nil
	} else if cc.Name != nil {
		if call, ok := cc.Stmt.Cmd.(*CallExpr); ok {
			// name was in fact the start of a call
			call.Args = append([]*Word{cc.Name}, call.Args...)
			cc.Name = nil
		}
	}
	s.Cmd = cc
}

func (p *Parser) letClause(s *Stmt) {
	lc := &LetClause{Let: p.pos}
	old := p.preNested(arithmExprLet)
	p.next()
	for !stopToken(p.tok) && !p.peekRedir() {
		x := p.arithmExpr(true)
		if x == nil {
			break
		}
		lc.Exprs = append(lc.Exprs, x)
	}
	if len(lc.Exprs) == 0 {
		p.followErrExp(lc.Let, "let")
	}
	p.postNested(old)
	s.Cmd = lc
}

func (p *Parser) bashFuncDecl(s *Stmt) {
	fpos := p.pos
	if p.next(); p.tok != _LitWord {
		p.followErr(fpos, "function", "a name")
	}
	name := p.lit(p.pos, p.val)
	hasParens := false
	if p.next(); p.got(leftParen) {
		hasParens = true
		p.follow(name.ValuePos, "foo(", rightParen)
	}
	p.funcDecl(s, name, fpos, hasParens)
}

func (p *Parser) testDecl(s *Stmt) {
	td := &TestDecl{Position: p.pos}
	p.next()
	if td.Description = p.getWord(); td.Description == nil {
		p.followErr(td.Position, "@test", "a description word")
	}
	if td.Body = p.getStmt(false, false, true); td.Body == nil {
		p.followErr(td.Position, `@test "desc"`, "a statement")
	}
	s.Cmd = td
}

func (p *Parser) callExpr(s *Stmt, w *Word, assign bool) {
	ce := p.call(w)
	if w == nil {
		ce.Args = ce.Args[:0]
	}
	if assign {
		ce.Assigns = append(ce.Assigns, p.getAssign(true))
	}
loop:
	for {
		switch p.tok {
		case _EOF, _Newl, semicolon, and, or, andAnd, orOr, orAnd,
			dblSemicolon, semiAnd, dblSemiAnd, semiOr:
			break loop
		case _LitWord:
			if len(ce.Args) == 0 && p.hasValidIdent() {
				ce.Assigns = append(ce.Assigns, p.getAssign(true))
				break
			}
			ce.Args = append(ce.Args, p.word(
				p.wps(p.lit(p.pos, p.val)),
			))
			p.next()
		case _Lit:
			if len(ce.Args) == 0 && p.hasValidIdent() {
				ce.Assigns = append(ce.Assigns, p.getAssign(true))
				break
			}
			ce.Args = append(ce.Args, p.word(p.wordParts()))
		case bckQuote:
			if p.backquoteEnd() {
				break loop
			}
			fallthrough
		case dollBrace, dollDblParen, dollParen, dollar, cmdIn, cmdOut,
			sglQuote, dollSglQuote, dblQuote, dollDblQuote, dollBrack,
			globQuest, globStar, globPlus, globAt, globExcl:
			ce.Args = append(ce.Args, p.word(p.wordParts()))
		case rdrOut, appOut, rdrIn, dplIn, dplOut, clbOut, rdrInOut,
			hdoc, dashHdoc, wordHdoc, rdrAll, appAll, _LitRedir:
			p.doRedirect(s)
		case dblLeftParen:
			p.curErr("%s can only be used to open an arithmetic cmd", p.tok)
		case rightParen:
			if p.quote == subCmd {
				break loop
			}
			fallthrough
		default:
			p.curErr("a command can only contain words and redirects; encountered %s", p.tok)
		}
	}
	if len(ce.Assigns) == 0 && len(ce.Args) == 0 {
		return
	}
	if len(ce.Args) == 0 {
		ce.Args = nil
	} else {
		for _, asgn := range ce.Assigns {
			if asgn.Index != nil || asgn.Array != nil {
				p.posErr(asgn.Pos(), "inline variables cannot be arrays")
			}
		}
	}
	s.Cmd = ce
}

func (p *Parser) funcDecl(s *Stmt, name *Lit, pos Pos, withParens bool) {
	fd := &FuncDecl{
		Position: pos,
		RsrvWord: pos != name.ValuePos,
		Parens:   withParens,
		Name:     name,
	}
	p.got(_Newl)
	if fd.Body = p.getStmt(false, false, true); fd.Body == nil {
		p.followErr(fd.Pos(), "foo()", "a statement")
	}
	s.Cmd = fd
}
0707010000005D000081A4000003E800000064000000016046124D000020D2000000000000000000000000000000000000002100000000sh-3.2.4/syntax/parser_arithm.gopackage syntax

// compact specifies whether we allow spaces between expressions.
// This is true for let
func (p *Parser) arithmExpr(compact bool) ArithmExpr {
	return p.arithmExprComma(compact)
}

// These function names are inspired by Bash's expr.c

func (p *Parser) arithmExprComma(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprAssign, Comma)
}

func (p *Parser) arithmExprAssign(compact bool) ArithmExpr {
	// Assign is different from the other binary operators because it's
	// right-associative and needs to check that it's placed after a name
	value := p.arithmExprTernary(compact)
	switch BinAritOperator(p.tok) {
	case AddAssgn, SubAssgn, MulAssgn, QuoAssgn, RemAssgn, AndAssgn,
		OrAssgn, XorAssgn, ShlAssgn, ShrAssgn, Assgn:
		if compact && p.spaced {
			return value
		}
		if !isArithName(value) {
			p.posErr(p.pos, "%s must follow a name", p.tok.String())
		}
		pos := p.pos
		tok := p.tok
		p.nextArithOp(compact)
		y := p.arithmExprAssign(compact)
		if y == nil {
			p.followErrExp(pos, tok.String())
		}
		return &BinaryArithm{
			OpPos: pos,
			Op:    BinAritOperator(tok),
			X:     value,
			Y:     y,
		}
	}
	return value
}

func (p *Parser) arithmExprTernary(compact bool) ArithmExpr {
	value := p.arithmExprLor(compact)
	if BinAritOperator(p.tok) != TernQuest || (compact && p.spaced) {
		return value
	}

if value == nil {
		p.curErr("%s must follow an expression", p.tok.String())
	}
	questPos := p.pos
	p.nextArithOp(compact)
	if BinAritOperator(p.tok) == TernColon {
		p.followErrExp(questPos, TernQuest.String())
	}
	trueExpr := p.arithmExpr(compact)
	if trueExpr == nil {
		p.followErrExp(questPos, TernQuest.String())
	}
	if BinAritOperator(p.tok) != TernColon {
		p.posErr(questPos, "ternary operator missing : after ?")
	}
	colonPos := p.pos
	p.nextArithOp(compact)
	falseExpr := p.arithmExprTernary(compact)
	if falseExpr == nil {
		p.followErrExp(colonPos, TernColon.String())
	}
	return &BinaryArithm{
		OpPos: questPos,
		Op:    BinAritOperator(TernQuest),
		X:     value,
		Y: &BinaryArithm{
			OpPos: colonPos,
			Op:    BinAritOperator(TernColon),
			X:     trueExpr,
			Y:     falseExpr,
		},
	}
}

func (p *Parser) arithmExprLor(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprLand, OrArit)
}

func (p *Parser) arithmExprLand(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprBor, AndArit)
}

func (p *Parser) arithmExprBor(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprBxor, Or)
}

func (p *Parser) arithmExprBxor(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprBand, Xor)
}

func (p *Parser) arithmExprBand(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprEquality, And)
}

func (p *Parser) arithmExprEquality(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprComparison, Eql, Neq)
}

func (p *Parser) arithmExprComparison(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprShift, Lss, Gtr, Leq, Geq)
}

func (p *Parser) arithmExprShift(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprAddition, Shl, Shr)
}

func (p *Parser) arithmExprAddition(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprMultiplication, Add, Sub)
}

func (p *Parser) arithmExprMultiplication(compact bool) ArithmExpr {
	return p.arithmExprBinary(compact, p.arithmExprPower, Mul, Quo, Rem)
}

func (p *Parser) arithmExprPower(compact bool) ArithmExpr {
	// Power is different from the other binary operators because it's right-associative
	value := p.arithmExprUnary(compact)
	if BinAritOperator(p.tok) != Pow || (compact && p.spaced) {
		return value
	}

if value == nil {
		p.curErr("%s must follow an expression", p.tok.String())
	}

op := p.tok
	pos := p.pos
	p.nextArithOp(compact)
	y := p.arithmExprPower(compact)
	if y == nil {
		p.followErrExp(pos, op.String())
	}
	return &BinaryArithm{
		OpPos: pos,
		Op:    BinAritOperator(op),
		X:     value,
		Y:     y,
	}
}

func (p *Parser) arithmExprUnary(compact bool) ArithmExpr {
	if !compact {
		p.got(_Newl)
	}

switch UnAritOperator(p.tok) {
	case Not, BitNegation, Plus, Minus:
		ue := &UnaryArithm{OpPos: p.pos, Op: UnAritOperator(p.tok)}
		p.nextArithOp(compact)
		if ue.X = p.arithmExprUnary(compact); ue.X == nil {
			p.followErrExp(ue.OpPos, ue.Op.String())
		}
		return ue
	}
	return p.arithmExprValue(compact)
}

func (p *Parser) arithmExprValue(compact bool) ArithmExpr {
	var x ArithmExpr
	switch p.tok {
	case addAdd, subSub:
		ue := &UnaryArithm{OpPos: p.pos, Op: UnAritOperator(p.tok)}
		p.nextArith(compact)
		if p.tok != _LitWord {
			p.followErr(ue.OpPos, token(ue.Op).String(), "a literal")
		}
		ue.X = p.arithmExprValue(compact)
		return ue
	case leftParen:
		pe := &ParenArithm{Lparen: p.pos}
		p.nextArithOp(compact)
		pe.X = p.followArithm(leftParen, pe.Lparen)
		pe.Rparen = p.matched(pe.Lparen, leftParen, rightParen)
		x = pe
	case leftBrack:
		p.curErr("[ must follow a name")
	case colon:
		p.curErr("ternary operator missing ? before :")
	case _LitWord:
		l := p.getLit()
		if p.tok != leftBrack {
			x = p.word(p.wps(l))
			break
		}
		pe := &ParamExp{Dollar: l.ValuePos, Short: true, Param: l}
		pe.Index = p.eitherIndex()
		x = p.word(p.wps(pe))
	case bckQuote:
		if p.quote == arithmExprLet && p.openBquotes > 0 {
			return nil
		}
		fallthrough
	default:
		if w := p.getWord(); w != nil {
			x = w
		} else {
			return nil
		}
	}

if compact && p.spaced {
		return x
	}
	if !compact {
		p.got(_Newl)
	}

// we want real nil, not (*Word)(nil) as that
	// sets the type to non-nil and then x != nil
	if p.tok == addAdd || p.tok == subSub {
		if !isArithName(x) {
			p.curErr("%s must follow a name", p.tok.String())
		}
		u := &UnaryArithm{
			Post:  true,
			OpPos: p.pos,
			Op:    UnAritOperator(p.tok),
			X:     x,
		}
		p.nextArith(compact)
		return u
	}
	return x
}

// nextArith consumes a token.
// It returns true if compact and the token was followed by spaces
func (p *Parser) nextArith(compact bool) bool {
	p.next()
	if compact && p.spaced {
		return true
	}
	if !compact {
		p.got(_Newl)
	}
	return false
}

func (p *Parser) nextArithOp(compact bool) {
	pos := p.pos
	tok := p.tok
	if p.nextArith(compact) {
		p.followErrExp(pos, tok.String())
	}
}

// arithmExprBinary is used for all left-associative binary operators
func (p *Parser) arithmExprBinary(compact bool, nextOp func(bool) ArithmExpr, operators ...BinAritOperator) ArithmExpr {
	value := nextOp(compact)
	for {
		var foundOp BinAritOperator
		for _, op := range operators {
			if p.tok == token(op) {
				foundOp = op
				break
			}
		}

if token(foundOp) == illegalTok || (compact && p.spaced) {
			return value
		}

if value == nil {
			p.curErr("%s must follow an expression", p.tok.String())
		}

pos := p.pos
		p.nextArithOp(compact)
		y := nextOp(compact)
		if y == nil {
			p.followErrExp(pos, foundOp.String())
		}

value = &BinaryArithm{
			OpPos: pos,
			Op:    foundOp,
			X:     value,
			Y:     y,
		}
	}
}

func isArithName(left ArithmExpr) bool {
	w, ok := left.(*Word)
	if !ok || len(w.Parts) != 1 {
		return false
	}
	switch x := w.Parts[0].(type) {
	case *Lit:
		return ValidName(x.Value)
	case *ParamExp:
		return x.nakedIndex()
	default:
		return false
	}
}

func (p *Parser) followArithm(ftok token, fpos Pos) ArithmExpr {
	x := p.arithmExpr(false)
	if x == nil {
		p.followErrExp(fpos, ftok.String())
	}
	return x
}

func (p *Parser) peekArithmEnd() bool {
	return p.tok == rightParen && p.r == ')'
}

func (p *Parser) arithmMatchingErr(pos Pos, left, right token) {
	switch p.tok {
	case _Lit, _LitWord:
		p.curErr("not a valid arithmetic operator: %s", p.val)
	case leftBrack:
		p.curErr("[ must follow a name")
	case colon:
		p.curErr("ternary operator missing ? before :")
	case rightParen, _EOF:
		p.matchingErr(pos, left, right)
	default:
		if p.quote == arithmExpr {
			p.curErr("not a valid arithmetic operator: %v", p.tok)
		}
		p.matchingErr(pos, left, right)
	}
}

func (p *Parser) matchedArithm(lpos Pos, left, right token) {
	if !p.got(right) {
		p.arithmMatchingErr(lpos, left, right)
	}
}

func (p *Parser) arithmEnd(ltok token, lpos Pos, old saveState) Pos {
	if !p.peekArithmEnd() {
		p.arithmMatchingErr(lpos, ltok, dblRightParen)
	}
	p.rune()
	p.postNested(old)
	pos := p.pos
	p.next()
	return pos
}
0707010000005E000081A4000003E800000064000000016046124D0000CE6B000000000000000000000000000000000000001F00000000sh-3.2.4/syntax/parser_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"reflect"
	"regexp"
	"strings"
	"testing"

"github.com/kr/pretty"
)

func TestKeepComments(t *testing.T) {
	t.Parallel()
	in := "# foo\ncmd\n# bar"
	want := &File{
		Stmts: []*Stmt{{
			Comments: []Comment{{Text: " foo"}},
			Cmd:      litCall("cmd"),
		}},
		Last: []Comment{{Text: " bar"}},
	}
	singleParse(NewParser(KeepComments(true)), in, want)(t)
}

func TestParseBash(t *testing.T) {
	t.Parallel()
	p := NewParser()
	for i, c := range append(fileTests, fileTestsNoPrint...) {
		want := c.Bash
		if want == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j), singleParse(p, in, want))
		}
	}
}

func TestParsePosOverflow(t *testing.T) {
	t.Parallel()

// If line/col numbers gets larger than 16-bit, we should probably use a
	// custom reader instead.
	tests := []struct {
		name, in, want string
	}{
		{
			"LineOverflowIsValid",
			strings.Repeat("\n", (1<<16)-1) + "foo; bar",
			"<nil>",
		},
		{
			"LineOverflowPosString",
			strings.Repeat("\n", (1<<16)-1) + ")",
			"?:1: ) can only be used to close a subshell",
		},
		{
			"LineOverflowExtraPosString",
			strings.Repeat("\n", (1<<16)+5) + ")",
			"?:1: ) can only be used to close a subshell",
		},
		{
			"ColOverflowPosString",
			strings.Repeat(" ", (1<<16)-1) + ")",
			"1:?: ) can only be used to close a subshell",
		},
		{
			"ColOverflowExtraPosString",
			strings.Repeat(" ", (1<<16)+5) + ")",
			"1:?: ) can only be used to close a subshell",
		},
		{
			"ColOverflowSkippedPosString",
			strings.Repeat(" ", (1<<16)+5) + "\n)",
			"2:1: ) can only be used to close a subshell",
		},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			test := test
			t.Parallel()

p := NewParser()
			_, err := p.Parse(strings.NewReader(test.in), "")
			got := fmt.Sprint(err)
			if got != test.want {
				t.Fatalf("want error %q, got %q", test.want, got)
			}
		})
	}
}

func TestParsePosix(t *testing.T) {
	t.Parallel()
	p := NewParser(Variant(LangPOSIX))
	for i, c := range append(fileTests, fileTestsNoPrint...) {
		want := c.Posix
		if want == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				singleParse(p, in, want))
		}
	}
}

func TestParseMirBSDKorn(t *testing.T) {
	t.Parallel()
	p := NewParser(Variant(LangMirBSDKorn))
	for i, c := range append(fileTests, fileTestsNoPrint...) {
		want := c.MirBSDKorn
		if want == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				singleParse(p, in, want))
		}
	}
}

func TestParseBats(t *testing.T) {
	t.Parallel()
	p := NewParser(Variant(LangBats))
	for i, c := range append(fileTests, fileTestsNoPrint...) {
		want := c.Bats
		if want == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				singleParse(p, in, want))
		}
	}
}

var (
	hasBash50  bool
	hasDash059 bool
	hasMksh57  bool
)

func TestMain(m *testing.M) {
	os.Setenv("LANGUAGE", "en_US.UTF8")
	os.Setenv("LC_ALL", "en_US.UTF8")
	hasBash50 = cmdContains("version 5.0", "bash", "--version")
	// dash provides no way to check its version, so we have to
	// check if it's new enough as to not have the bug that breaks
	// our integration tests. Blergh.
	hasDash059 = cmdContains("Bad subst", "dash", "-c", "echo ${#<}")
	hasMksh57 = cmdContains(" R57 ", "mksh", "-c", "echo $KSH_VERSION")
	os.Exit(m.Run())
}

func cmdContains(substr, cmd string, args ...string) bool {
	out, err := exec.Command(cmd, args...).CombinedOutput()
	got := string(out)
	if err != nil {
		got += "\n" + err.Error()
	}
	return strings.Contains(got, substr)
}

var extGlobRe = regexp.MustCompile(`[@?*+!]\(`)

func confirmParse(in, cmd string, wantErr bool) func(*testing.T) {
	return func(t *testing.T) {
		t.Parallel()
		var opts []string
		if cmd == "bash" && extGlobRe.MatchString(in) {
			// otherwise bash refuses to parse these
			// properly. Also avoid -n since that too makes
			// bash bail.
			in = "shopt -s extglob\n" + in
		} else if !wantErr {
			// -n makes bash accept invalid inputs like
			// "let" or "`{`", so only use it in
			// non-erroring tests. Should be safe to not use
			// -n anyway since these are supposed to just
			// fail.
			// also, -n will break if we are using extglob
			// as extglob is not actually applied.
			opts = append(opts, "-n")
		}
		cmd := exec.Command(cmd, opts...)
		cmd.Stdin = strings.NewReader(in)
		var stderr bytes.Buffer
		cmd.Stderr = &stderr
		err := cmd.Run()
		if stderr.Len() > 0 {
			// bash sometimes likes to error on an input via stderr
			// while forgetting to set the exit code to non-zero.
			// Fun.
			if s := stderr.String(); !strings.Contains(s, ": warning: ") {
				err = errors.New(s)
			}
		}
		if err != nil && strings.Contains(err.Error(), "command not found") {
			err = nil
		}
		if wantErr && err == nil {
			t.Fatalf("Expected error in `%s` of %q, found none", strings.Join(cmd.Args, " "), in)
		} else if !wantErr && err != nil {
			t.Fatalf("Unexpected error in `%s` of %q: %v", strings.Join(cmd.Args, " "), in, err)
		}
	}
}

func TestParseBashConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling bash is slow.")
	}
	if !hasBash50 {
		t.Skip("bash 5.0 required to run")
	}
	i := 0
	for _, c := range append(fileTests, fileTestsNoPrint...) {
		if c.Bash == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				confirmParse(in, "bash", false))
		}
		i++
	}
}

func TestParsePosixConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling dash is slow.")
	}
	if !hasDash059 {
		t.Skip("dash 0.5.9 or newer required to run")
	}
	i := 0
	for _, c := range append(fileTests, fileTestsNoPrint...) {
		if c.Posix == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				confirmParse(in, "dash", false))
		}
		i++
	}
}

func TestParseMirBSDKornConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling mksh is slow.")
	}
	if !hasMksh57 {
		t.Skip("mksh 57 required to run")
	}
	i := 0
	for _, c := range append(fileTests, fileTestsNoPrint...) {
		if c.MirBSDKorn == nil {
			continue
		}
		for j, in := range c.Strs {
			t.Run(fmt.Sprintf("%03d-%d", i, j),
				confirmParse(in, "mksh", false))
		}
		i++
	}
}

func TestParseErrBashConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling bash is slow.")
	}
	if !hasBash50 {
		t.Skip("bash 5.0 required to run")
	}
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.bsmk != nil {
			want = c.bsmk
		}
		if c.bash != nil {
			want = c.bash
		}
		if want == nil {
			continue
		}
		wantErr := !strings.Contains(want.(string), " #NOERR")
		t.Run(fmt.Sprintf("%03d", i), confirmParse(c.in, "bash", wantErr))
		i++
	}
}

func TestParseErrPosixConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling dash is slow.")
	}
	if !hasDash059 {
		t.Skip("dash 0.5.9 or newer required to run")
	}
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.posix != nil {
			want = c.posix
		}
		if want == nil {
			continue
		}
		wantErr := !strings.Contains(want.(string), " #NOERR")
		t.Run(fmt.Sprintf("%03d", i), confirmParse(c.in, "dash", wantErr))
		i++
	}
}

func TestParseErrMirBSDKornConfirm(t *testing.T) {
	if testing.Short() {
		t.Skip("calling mksh is slow.")
	}
	if !hasMksh57 {
		t.Skip("mksh 57 required to run")
	}
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.bsmk != nil {
			want = c.bsmk
		}
		if c.mksh != nil {
			want = c.mksh
		}
		if want == nil {
			continue
		}
		wantErr := !strings.Contains(want.(string), " #NOERR")
		t.Run(fmt.Sprintf("%03d", i), confirmParse(c.in, "mksh", wantErr))
		i++
	}
}

func singleParse(p *Parser, in string, want *File) func(t *testing.T) {
	return func(t *testing.T) {
		t.Helper()
		got, err := p.Parse(newStrictReader(in), "")
		if err != nil {
			t.Fatalf("Unexpected error in %q: %v", in, err)
		}
		clearPosRecurse(t, in, got)
		if !reflect.DeepEqual(got, want) {
			t.Fatalf("syntax tree mismatch in %q\ndiff:\n%s", in,
				strings.Join(pretty.Diff(want, got), "\n"))
		}
	}
}

func BenchmarkParse(b *testing.B) {
	b.ReportAllocs()
	src := "" +
		strings.Repeat("\n\n\t\t        \n", 10) +
		"# " + strings.Repeat("foo bar ", 10) + "\n" +
		strings.Repeat("longlit_", 10) + "\n" +
		"'" + strings.Repeat("foo bar ", 10) + "'\n" +
		`"` + strings.Repeat("foo bar ", 10) + `"` + "\n" +
		strings.Repeat("aa bb cc dd; ", 6) +
		"a() { (b); { c; }; }; $(d; `e`)\n" +
		"foo=bar; a=b; c=d$foo${bar}e $simple ${complex:-default}\n" +
		"if a; then while b; do for c in d e; do f; done; done; fi\n" +
		"a | b && c || d | e && g || f\n" +
		"foo >a <b <<<c 2>&1 <<EOF\n" +
		strings.Repeat("somewhat long heredoc line\n", 10) +
		"EOF" +
		""
	p := NewParser(KeepComments(true))
	in := strings.NewReader(src)
	for i := 0; i < b.N; i++ {
		if _, err := p.Parse(in, ""); err != nil {
			b.Fatal(err)
		}
		in.Reset(src)
	}
}

type errorCase struct {
	in          string
	common      interface{}
	bash, posix interface{}
	bsmk, mksh  interface{}
}

func checkError(p *Parser, in, want string) func(*testing.T) {
	return func(t *testing.T) {
		if i := strings.Index(want, " #NOERR"); i >= 0 {
			want = want[:i]
		}
		_, err := p.Parse(newStrictReader(in), "")
		if err == nil {
			t.Fatalf("Expected error in %q: %v", in, want)
		}
		if got := err.Error(); got != want {
			t.Fatalf("Error mismatch in %q\nwant: %s\ngot:  %s",
				in, want, got)
		}
	}
}

func TestParseErrPosix(t *testing.T) {
	t.Parallel()
	p := NewParser(KeepComments(true), Variant(LangPOSIX))
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.posix != nil {
			want = c.posix
		}
		if want == nil {
			continue
		}
		t.Run(fmt.Sprintf("%03d", i), checkError(p, c.in, want.(string)))
		i++
	}
}

func TestParseErrBash(t *testing.T) {
	t.Parallel()
	p := NewParser(KeepComments(true))
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.bsmk != nil {
			want = c.bsmk
		}
		if c.bash != nil {
			want = c.bash
		}
		if want == nil {
			continue
		}
		t.Run(fmt.Sprintf("%03d", i), checkError(p, c.in, want.(string)))
		i++
	}
}

func TestParseErrMirBSDKorn(t *testing.T) {
	t.Parallel()
	p := NewParser(KeepComments(true), Variant(LangMirBSDKorn))
	i := 0
	for _, c := range shellTests {
		want := c.common
		if c.bsmk != nil {
			want = c.bsmk
		}
		if c.mksh != nil {
			want = c.mksh
		}
		if want == nil {
			continue
		}
		t.Run(fmt.Sprintf("%03d", i), checkError(p, c.in, want.(string)))
		i++
	}
}

func TestInputName(t *testing.T) {
	t.Parallel()
	in := "("
	want := "some-file.sh:1:1: reached EOF without matching ( with )"
	p := NewParser()
	_, err := p.Parse(strings.NewReader(in), "some-file.sh")
	if err == nil {
		t.Fatalf("Expected error in %q: %v", in, want)
	}
	got := err.Error()
	if got != want {
		t.Fatalf("Error mismatch in %q\nwant: %s\ngot:  %s",
			in, want, got)
	}
}

var errBadReader = fmt.Errorf("write: expected error")

type badReader struct{}

func (b badReader) Read(p []byte) (int, error) { return 0, errBadReader }

func TestReadErr(t *testing.T) {
	t.Parallel()
	p := NewParser()
	_, err := p.Parse(badReader{}, "")
	if err == nil {
		t.Fatalf("Expected error with bad reader")
	}
	if err != errBadReader {
		t.Fatalf("Error mismatch with bad reader:\nwant: %v\ngot:  %v",
			errBadReader, err)
	}
}

type strictStringReader struct {
	*strings.Reader
	gaveEOF bool
}

func newStrictReader(s string) *strictStringReader {
	return &strictStringReader{Reader: strings.NewReader(s)}
}

func (r *strictStringReader) Read(p []byte) (int, error) {
	n, err := r.Reader.Read(p)
	if err == io.EOF {
		if r.gaveEOF {
			return n, fmt.Errorf("duplicate EOF read")
		}
		r.gaveEOF = true
	}
	return n, err
}

func TestParseStmts(t *testing.T) {
	t.Parallel()
	p := NewParser()
	inReader, inWriter := io.Pipe()
	recv := make(chan bool, 10)
	errc := make(chan error, 1)
	go func() {
		errc <- p.Stmts(inReader, func(s *Stmt) bool {
			recv <- true
			return true
		})
	}()
	io.WriteString(inWriter, "foo\n")
	<-recv
	io.WriteString(inWriter, "bar; baz")
	inWriter.Close()
	<-recv
	<-recv
	if err := <-errc; err != nil {
		t.Fatalf("Expected no error: %v", err)
	}
}

func TestParseStmtsStopEarly(t *testing.T) {
	t.Parallel()
	p := NewParser()
	inReader, inWriter := io.Pipe()
	defer inWriter.Close()
	recv := make(chan bool, 10)
	errc := make(chan error, 1)
	go func() {
		errc <- p.Stmts(inReader, func(s *Stmt) bool {
			recv <- true
			return !s.Background
		})
	}()
	io.WriteString(inWriter, "a\n")
	<-recv
	io.WriteString(inWriter, "b &\n") // stop here
	<-recv
	if err := <-errc; err != nil {
		t.Fatalf("Expected no error: %v", err)
	}
}

func TestParseStmtsError(t *testing.T) {
	t.Parallel()
	in := "foo; )"
	p := NewParser()
	recv := make(chan bool, 10)
	errc := make(chan error, 1)
	go func() {
		errc <- p.Stmts(strings.NewReader(in), func(s *Stmt) bool {
			recv <- true
			return true
		})
	}()
	<-recv
	if err := <-errc; err == nil {
		t.Fatalf("Expected an error in %q, but got nil", in)
	}
}

func TestParseWords(t *testing.T) {
	t.Parallel()
	p := NewParser()
	inReader, inWriter := io.Pipe()
	recv := make(chan bool, 10)
	errc := make(chan error, 1)
	go func() {
		errc <- p.Words(inReader, func(w *Word) bool {
			recv <- true
			return true
		})
	}()
	// TODO: Allow a single space to end parsing a word. At the moment, the
	// parser must read the next non-space token (the next literal or
	// newline, in this case) to finish parsing a word.
	io.WriteString(inWriter, "foo ")
	io.WriteString(inWriter, "bar\n")
	<-recv
	io.WriteString(inWriter, "baz etc")
	inWriter.Close()
	<-recv
	<-recv
	<-recv
	if err := <-errc; err != nil {
		t.Fatalf("Expected no error: %v", err)
	}
}

func TestParseWordsStopEarly(t *testing.T) {
	t.Parallel()
	p := NewParser()
	r := strings.NewReader("a\nb\nc\n")
	parsed := 0
	err := p.Words(r, func(w *Word) bool {
		parsed++
		return w.Lit() != "b"
	})
	if err != nil {
		t.Fatalf("Expected no error: %v", err)
	}
	if want := 2; parsed != want {
		t.Fatalf("wanted %d words parsed, got %d", want, parsed)
	}
}

func TestParseWordsError(t *testing.T) {
	t.Parallel()
	in := "foo )"
	p := NewParser()
	recv := make(chan bool, 10)
	errc := make(chan error, 1)
	go func() {
		errc <- p.Words(strings.NewReader(in), func(w *Word) bool {
			recv <- true
			return true
		})
	}()
	<-recv
	want := "1:5: ) is not a valid word"
	got := fmt.Sprintf("%v", <-errc)
	if got != want {
		t.Fatalf("Expected %q as an error, but got %q", want, got)
	}
}

var documentTests = []struct {
	in   string
	want []WordPart
}{
	{
		"foo",
		[]WordPart{lit("foo")},
	},
	{
		" foo  $bar",
		[]WordPart{
			lit(" foo  "),
			litParamExp("bar"),
		},
	},
	{
		"$bar\n\n",
		[]WordPart{
			litParamExp("bar"),
			lit("\n\n"),
		},
	},
}

func TestParseDocument(t *testing.T) {
	t.Parallel()
	p := NewParser()

for i, tc := range documentTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			got, err := p.Document(strings.NewReader(tc.in))
			if err != nil {
				t.Fatal(err)
			}
			clearPosRecurse(t, "", got)
			want := &Word{Parts: tc.want}
			if !reflect.DeepEqual(got, want) {
				t.Fatalf("syntax tree mismatch in %q\ndiff:\n%s", tc.in,
					strings.Join(pretty.Diff(want, got), "\n"))
			}
		})
	}
}

func TestParseDocumentError(t *testing.T) {
	t.Parallel()
	in := "foo $("
	p := NewParser()
	_, err := p.Document(strings.NewReader(in))
	want := "1:5: reached EOF without matching ( with )"
	got := fmt.Sprintf("%v", err)
	if got != want {
		t.Fatalf("Expected %q as an error, but got %q", want, got)
	}
}

var arithmeticTests = []struct {
	in   string
	want ArithmExpr
}{
	{
		"foo",
		litWord("foo"),
	},
	{
		"3 + 4",
		&BinaryArithm{
			Op: Add,
			X:  litWord("3"),
			Y:  litWord("4"),
		},
	},
	{
		"3 + 4 + 5",
		&BinaryArithm{
			Op: Add,
			X: &BinaryArithm{
				Op: Add,
				X:  litWord("3"),
				Y:  litWord("4"),
			},
			Y: litWord("5"),
		},
	},
	{
		"1 ? 0 : 2",
		&BinaryArithm{
			Op: TernQuest,
			X:  litWord("1"),
			Y: &BinaryArithm{
				Op: TernColon,
				X:  litWord("0"),
				Y:  litWord("2"),
			},
		},
	},
	{
		"a = 3, ++a, a--",
		&BinaryArithm{
			Op: Comma,
			X: &BinaryArithm{
				Op: Comma,
				X: &BinaryArithm{
					Op: Assgn,
					X:  litWord("a"),
					Y:  litWord("3"),
				},
				Y: &UnaryArithm{
					Op: Inc,
					X:  litWord("a"),
				},
			},
			Y: &UnaryArithm{
				Op:   Dec,
				Post: true,
				X:    litWord("a"),
			},
		},
	},
}

func TestParseArithmetic(t *testing.T) {
	t.Parallel()
	p := NewParser()

for i, tc := range arithmeticTests {
		t.Run(fmt.Sprintf("%02d", i), func(t *testing.T) {
			got, err := p.Arithmetic(strings.NewReader(tc.in))
			if err != nil {
				t.Fatal(err)
			}
			clearPosRecurse(t, "", got)
			if !reflect.DeepEqual(got, tc.want) {
				t.Fatalf("syntax tree mismatch in %q\ndiff:\n%s", tc.in,
					strings.Join(pretty.Diff(tc.want, got), "\n"))
			}
		})
	}
}

func TestParseArithmeticError(t *testing.T) {
	t.Parallel()
	in := "3 +"
	p := NewParser()
	_, err := p.Arithmetic(strings.NewReader(in))
	want := "1:3: + must be followed by an expression"
	got := fmt.Sprintf("%v", err)
	if got != want {
		t.Fatalf("Expected %q as an error, but got %q", want, got)
	}
}

func TestParseStmtsStopAt(t *testing.T) {
	t.Parallel()
	for i, c := range stopAtTests {
		p := NewParser(StopAt(c.stop))
		want := fullProg(c.want)
		t.Run(fmt.Sprintf("%02d", i), singleParse(p, c.in, want))
	}
}

func TestValidName(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name string
		in   string
		want bool
	}{
		{"Empty", "", false},
		{"Simple", "foo", true},
		{"MixedCase", "Foo", true},
		{"Underscore", "_foo", true},
		{"NumberPrefix", "3foo", false},
		{"NumberSuffix", "foo3", true},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got := ValidName(tc.in)
			if got != tc.want {
				t.Fatalf("ValidName(%q) got %t, wanted %t",
					tc.in, got, tc.want)
			}
		})
	}
}

func TestIsIncomplete(t *testing.T) {
	t.Parallel()

tests := []struct {
		in   string
		want bool
	}{
		{"foo\n", false},
		{"foo;", false},
		{"\n", false},
		{"'incomp", true},
		{"foo; 'incomp", true},
		{" (incomp", true},
		{"badsyntax)", false},
	}
	p := NewParser()
	for i, tc := range tests {
		t.Run(fmt.Sprintf("Parse%02d", i), func(t *testing.T) {
			r := strings.NewReader(tc.in)
			_, err := p.Parse(r, "")
			if got := IsIncomplete(err); got != tc.want {
				t.Fatalf("%q got %t, wanted %t", tc.in, got, tc.want)
			}
		})
		t.Run(fmt.Sprintf("Interactive%02d", i), func(t *testing.T) {
			r := strings.NewReader(tc.in)
			err := p.Interactive(r, func([]*Stmt) bool {
				return false
			})
			if got := IsIncomplete(err); got != tc.want {
				t.Fatalf("%q got %t, wanted %t", tc.in, got, tc.want)
			}
		})
	}
}
0707010000005F000081A4000003E800000064000000016046124D000077A5000000000000000000000000000000000000001B00000000sh-3.2.4/syntax/printer.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"strings"
	"text/tabwriter"
	"unicode"
)

// PrinterOption is a function which can be passed to NewPrinter
// to alter its behaviour. To apply option to existing Printer
// call it directly, for example KeepPadding(true)(printer).
type PrinterOption func(*Printer)

// Indent sets the number of spaces used for indentation. If set to 0,
// tabs will be used instead.
func Indent(spaces uint) PrinterOption {
	return func(p *Printer) { p.indentSpaces = spaces }
}

// BinaryNextLine will make binary operators appear on the next line
// when a binary command, such as a pipe, spans multiple lines. A
// backslash will be used.
func BinaryNextLine(enabled bool) PrinterOption {
	return func(p *Printer) { p.binNextLine = enabled }
}

// SwitchCaseIndent will make switch cases be indented. As such, switch
// case bodies will be two levels deeper than the switch itself.
func SwitchCaseIndent(enabled bool) PrinterOption {
	return func(p *Printer) { p.swtCaseIndent = enabled }
}

// TODO(v4): consider turning this into a "space all operators" option, to also
// allow foo=( bar baz ), (( x + y )), and so on.

// SpaceRedirects will put a space after most redirection operators. The
// exceptions are '>&', '<&', '>(', and '<('.
func SpaceRedirects(enabled bool) PrinterOption {
	return func(p *Printer) { p.spaceRedirects = enabled }
}

// KeepPadding will keep most nodes and tokens in the same column that
// they were in the original source. This allows the user to decide how
// to align and pad their code with spaces.
//
// Note that this feature is best-effort and will only keep the
// alignment stable, so it may need some human help the first time it is
// run.
func KeepPadding(enabled bool) PrinterOption {
	return func(p *Printer) {
		if enabled && !p.keepPadding {
			// Enable the flag, and set up the writer wrapper.
			p.keepPadding = true
			p.cols.Writer = p.bufWriter.(*bufio.Writer)
			p.bufWriter = &p.cols

} else if !enabled && p.keepPadding {
			// Ensure we reset the state to that of NewPrinter.
			p.keepPadding = false
			p.bufWriter = p.cols.Writer
			p.cols = colCounter{}
		}
	}
}

// Minify will print programs in a way to save the most bytes possible.
// For example, indentation and comments are skipped, and extra
// whitespace is avoided when possible.
func Minify(enabled bool) PrinterOption {
	return func(p *Printer) { p.minify = enabled }
}

// FunctionNextLine will place a function's opening braces on the next line.
func FunctionNextLine(enabled bool) PrinterOption {
	return func(p *Printer) { p.funcNextLine = enabled }
}

// NewPrinter allocates a new Printer and applies any number of options.
func NewPrinter(opts ...PrinterOption) *Printer {
	p := &Printer{
		bufWriter: bufio.NewWriter(nil),
		tabWriter: new(tabwriter.Writer),
	}
	for _, opt := range opts {
		opt(p)
	}
	return p
}

// Print "pretty-prints" the given syntax tree node to the given writer. Writes
// to w are buffered.
//
// The node types supported at the moment are *File, *Stmt, *Word, any Command
// node, and any WordPart node. A trailing newline will only be printed when a
// *File is used.
func (p *Printer) Print(w io.Writer, node Node) error {
	p.reset()

// TODO: consider adding a raw mode to skip the tab writer, much like in
	// go/printer.
	twmode := tabwriter.DiscardEmptyColumns | tabwriter.StripEscape
	tabwidth := 8
	if p.indentSpaces == 0 {
		// indenting with tabs
		twmode |= tabwriter.TabIndent
	} else {
		// indenting with spaces
		tabwidth = int(p.indentSpaces)
	}
	p.tabWriter.Init(w, 0, tabwidth, 1, ' ', twmode)
	w = p.tabWriter

p.bufWriter.Reset(w)
	switch x := node.(type) {
	case *File:
		p.stmtList(x.Stmts, x.Last)
		p.newline(x.End())
	case *Stmt:
		p.stmtList([]*Stmt{x}, nil)
	case Command:
		p.line = x.Pos().Line()
		p.command(x, nil)
	case *Word:
		p.line = x.Pos().Line()
		p.word(x)
	case WordPart:
		p.line = x.Pos().Line()
		p.wordPart(x, nil)
	default:
		return fmt.Errorf("unsupported node type: %T", x)
	}
	p.flushHeredocs()
	p.flushComments()

// flush the writers
	if err := p.bufWriter.Flush(); err != nil {
		return err
	}
	if tw, _ := w.(*tabwriter.Writer); tw != nil {
		if err := tw.Flush(); err != nil {
			return err
		}
	}
	return nil
}

type bufWriter interface {
	Write([]byte) (int, error)
	WriteString(string) (int, error)
	WriteByte(byte) error
	Reset(io.Writer)
	Flush() error
}

type colCounter struct {
	*bufio.Writer
	column    int
	lineStart bool
}

func (c *colCounter) addByte(b byte) {
	switch b {
	case '\n':
		c.column = 0
		c.lineStart = true
	case '\t', ' ', tabwriter.Escape:
	default:
		c.lineStart = false
	}
	c.column++
}

func (c *colCounter) WriteByte(b byte) error {
	c.addByte(b)
	return c.Writer.WriteByte(b)
}

func (c *colCounter) WriteString(s string) (int, error) {
	for _, b := range []byte(s) {
		c.addByte(b)
	}
	return c.Writer.WriteString(s)
}

func (c *colCounter) Reset(w io.Writer) {
	c.column = 1
	c.lineStart = true
	c.Writer.Reset(w)
}

// Printer holds the internal state of the printing mechanism of a
// program.
type Printer struct {
	bufWriter
	tabWriter *tabwriter.Writer
	cols      colCounter

indentSpaces   uint
	binNextLine    bool
	swtCaseIndent  bool
	spaceRedirects bool
	keepPadding    bool
	minify         bool
	funcNextLine   bool

wantSpace   bool
	wantNewline bool
	wroteSemi   bool

// pendingComments are any comments in the current line or statement
	// that we have yet to print. This is useful because that way, we can
	// ensure that all comments are written immediately before a newline.
	// Otherwise, in some edge cases we might wrongly place words after a
	// comment in the same line, breaking programs.
	pendingComments []Comment

// firstLine means we are still writing the first line
	firstLine bool
	// line is the current line number
	line uint

// lastLevel is the last level of indentation that was used.
	lastLevel uint
	// level is the current level of indentation.
	level uint
	// levelIncs records which indentation level increments actually
	// took place, to revert them once their section ends.
	levelIncs []bool

nestedBinary bool

// pendingHdocs is the list of pending heredocs to write.
	pendingHdocs []*Redirect

// used when printing <<- heredocs with tab indentation
	tabsPrinter *Printer
}

func (p *Printer) reset() {
	p.wantSpace, p.wantNewline = false, false
	p.pendingComments = p.pendingComments[:0]

// minification uses its own newline logic
	p.firstLine = !p.minify
	p.line = 0

p.lastLevel, p.level = 0, 0
	p.levelIncs = p.levelIncs[:0]
	p.nestedBinary = false
	p.pendingHdocs = p.pendingHdocs[:0]
}

func (p *Printer) spaces(n uint) {
	for i := uint(0); i < n; i++ {
		p.WriteByte(' ')
	}
}

func (p *Printer) space() {
	p.WriteByte(' ')
	p.wantSpace = false
}

func (p *Printer) spacePad(pos Pos) {
	if p.cols.lineStart && p.indentSpaces == 0 {
		// Never add padding at the start of a line unless we are indenting
		// with spaces, since this may result in mixing of spaces and tabs.
		return
	}
	if p.wantSpace {
		p.WriteByte(' ')
		p.wantSpace = false
	}
	for p.cols.column > 0 && p.cols.column < int(pos.col) {
		p.WriteByte(' ')
	}
}

func (p *Printer) bslashNewl() {
	if p.wantSpace {
		p.space()
	}
	p.WriteString("\\\n")
	p.line++
	p.indent()
}

func (p *Printer) spacedString(s string, pos Pos) {
	p.spacePad(pos)
	p.WriteString(s)
	p.wantSpace = true
}

func (p *Printer) spacedToken(s string, pos Pos) {
	if p.minify {
		p.WriteString(s)
		p.wantSpace = false
		return
	}
	p.spacePad(pos)
	p.WriteString(s)
	p.wantSpace = true
}

func (p *Printer) semiOrNewl(s string, pos Pos) {
	if p.wantNewline {
		p.newline(pos)
		p.indent()
	} else {
		if !p.wroteSemi {
			p.WriteByte(';')
		}
		if !p.minify {
			p.space()
		}
		p.line = pos.Line()
	}
	p.WriteString(s)
	p.wantSpace = true
}

func (p *Printer) writeLit(s string) {
	// If p.tabWriter is nil, this is the nested printer being used to print
	// <<- heredoc bodies, so the parent printer will add the escape bytes
	// later.
	if p.tabWriter != nil && strings.Contains(s, "\t") {
		p.WriteByte(tabwriter.Escape)
		defer p.WriteByte(tabwriter.Escape)
	}
	p.WriteString(s)
}

func (p *Printer) incLevel() {
	inc := false
	if p.level <= p.lastLevel || len(p.levelIncs) == 0 {
		p.level++
		inc = true
	} else if last := &p.levelIncs[len(p.levelIncs)-1]; *last {
		*last = false
		inc = true
	}
	p.levelIncs = append(p.levelIncs, inc)
}

func (p *Printer) decLevel() {
	if p.levelIncs[len(p.levelIncs)-1] {
		p.level--
	}
	p.levelIncs = p.levelIncs[:len(p.levelIncs)-1]
}

func (p *Printer) indent() {
	if p.minify {
		return
	}
	p.lastLevel = p.level
	switch {
	case p.level == 0:
	case p.indentSpaces == 0:
		p.WriteByte(tabwriter.Escape)
		for i := uint(0); i < p.level; i++ {
			p.WriteByte('\t')
		}
		p.WriteByte(tabwriter.Escape)
	default:
		p.spaces(p.indentSpaces * p.level)
	}
}

func (p *Printer) newline(pos Pos) {
	p.flushHeredocs()
	p.flushComments()
	p.WriteByte('\n')
	p.wantNewline, p.wantSpace = false, false
	if p.line < pos.Line() {
		p.line++
	}
}

func (p *Printer) flushHeredocs() {
	if len(p.pendingHdocs) == 0 {
		return
	}
	hdocs := p.pendingHdocs
	p.pendingHdocs = p.pendingHdocs[:0]
	coms := p.pendingComments
	p.pendingComments = nil
	if len(coms) > 0 {
		c := coms[0]
		if c.Pos().Line() == p.line {
			p.pendingComments = append(p.pendingComments, c)
			p.flushComments()
			coms = coms[1:]
		}
	}

// Reuse the last indentation level, as
	// indentation levels are usually changed before
	// newlines are printed along with their
	// subsequent indentation characters.
	newLevel := p.level
	p.level = p.lastLevel

for _, r := range hdocs {
		p.line++
		p.WriteByte('\n')
		p.wantNewline, p.wantSpace = false, false
		if r.Op == DashHdoc && p.indentSpaces == 0 && !p.minify {
			if r.Hdoc != nil {
				extra := extraIndenter{
					bufWriter:   p.bufWriter,
					baseIndent:  int(p.level + 1),
					firstIndent: -1,
				}
				p.tabsPrinter = &Printer{
					bufWriter: &extra,

// The options need to persist.
					indentSpaces:   p.indentSpaces,
					binNextLine:    p.binNextLine,
					swtCaseIndent:  p.swtCaseIndent,
					spaceRedirects: p.spaceRedirects,
					keepPadding:    p.keepPadding,
					minify:         p.minify,
					funcNextLine:   p.funcNextLine,

line: r.Hdoc.Pos().Line(),
				}
				p.tabsPrinter.wordParts(r.Hdoc.Parts, true)
			}
			p.indent()
		} else if r.Hdoc != nil {
			p.wordParts(r.Hdoc.Parts, true)
		}
		p.unquotedWord(r.Word)
		if r.Hdoc != nil {
			// Overwrite p.line, since printing r.Word again can set
			// p.line to the beginning of the heredoc again.
			p.line = r.Hdoc.End().Line()
		}
		p.wantSpace = false
	}
	p.level = newLevel
	p.pendingComments = coms
}

func (p *Printer) newlines(pos Pos) {
	if p.firstLine && len(p.pendingComments) == 0 {
		p.firstLine = false
		return // no empty lines at the top
	}
	if !p.wantNewline && pos.Line() <= p.line {
		return
	}
	p.newline(pos)
	if pos.Line() > p.line {
		if !p.minify {
			// preserve single empty lines
			p.WriteByte('\n')
		}
		p.line++
	}
	p.indent()
}

func (p *Printer) rightParen(pos Pos) {
	if !p.minify {
		p.newlines(pos)
	}
	p.WriteByte(')')
	p.wantSpace = true
}

func (p *Printer) semiRsrv(s string, pos Pos) {
	if p.wantNewline || pos.Line() > p.line {
		p.newlines(pos)
	} else {
		if !p.wroteSemi {
			p.WriteByte(';')
		}
		if !p.minify {
			p.spacePad(pos)
		}
	}
	p.WriteString(s)
	p.wantSpace = true
}

func (p *Printer) flushComments() {
	for i, c := range p.pendingComments {
		if i == 0 {
			// Flush any pending heredocs first. Otherwise, the
			// comments would become part of a heredoc body.
			p.flushHeredocs()
		}
		p.firstLine = false
		// We can't call any of the newline methods, as they call this
		// function and we'd recurse forever.
		cline := c.Hash.Line()
		switch {
		case i > 0, cline > p.line && p.line > 0:
			p.WriteByte('\n')
			if cline > p.line+1 {
				p.WriteByte('\n')
			}
			p.indent()
			p.wantSpace = false
			p.spacePad(c.Pos())
		case p.wantSpace:
			if p.keepPadding {
				p.spacePad(c.Pos())
			} else {
				p.WriteByte('\t')
			}
		}
		// don't go back one line, which may happen in some edge cases
		if p.line < cline {
			p.line = cline
		}
		p.WriteByte('#')
		p.writeLit(strings.TrimRightFunc(c.Text, unicode.IsSpace))
		p.wantNewline = true
	}
	p.pendingComments = nil
}

func (p *Printer) comments(comments ...Comment) {
	if p.minify {
		return
	}
	p.pendingComments = append(p.pendingComments, comments...)
}

func (p *Printer) wordParts(wps []WordPart, quoted bool) {
	for i, wp := range wps {
		var next WordPart
		if i+1 < len(wps) {
			next = wps[i+1]
		}
		for wp.Pos().Line() > p.line {
			if quoted {
				// No extra spacing or indentation if quoted.
				p.WriteString("\\\n")
				p.line++
			} else {
				p.bslashNewl()
			}
		}
		p.wordPart(wp, next)
		p.line = wp.End().Line()
	}
}

func (p *Printer) wordPart(wp, next WordPart) {
	switch x := wp.(type) {
	case *Lit:
		p.writeLit(x.Value)
	case *SglQuoted:
		if x.Dollar {
			p.WriteByte('$')
		}
		p.WriteByte('\'')
		p.writeLit(x.Value)
		p.WriteByte('\'')
		p.line = x.End().Line()
	case *DblQuoted:
		p.dblQuoted(x)
	case *CmdSubst:
		p.line = x.Pos().Line()
		switch {
		case x.TempFile:
			p.WriteString("${")
			p.wantSpace = true
			p.nestedStmts(x.Stmts, x.Last, x.Right)
			p.wantSpace = false
			p.semiRsrv("}", x.Right)
		case x.ReplyVar:
			p.WriteString("${|")
			p.nestedStmts(x.Stmts, x.Last, x.Right)
			p.wantSpace = false
			p.semiRsrv("}", x.Right)
		default:
			p.WriteString("$(")
			p.wantSpace = len(x.Stmts) > 0 && startsWithLparen(x.Stmts[0])
			p.nestedStmts(x.Stmts, x.Last, x.Right)
			p.rightParen(x.Right)
		}
	case *ParamExp:
		litCont := ";"
		if nextLit, ok := next.(*Lit); ok && nextLit.Value != "" {
			litCont = nextLit.Value[:1]
		}
		name := x.Param.Value
		switch {
		case !p.minify:
		case x.Excl, x.Length, x.Width:
		case x.Index != nil, x.Slice != nil:
		case x.Repl != nil, x.Exp != nil:
		case len(name) > 1 && !ValidName(name): // ${10}
		case ValidName(name + litCont): // ${var}cont
		default:
			x2 := *x
			x2.Short = true
			p.paramExp(&x2)
			return
		}
		p.paramExp(x)
	case *ArithmExp:
		p.WriteString("$((")
		if x.Unsigned {
			p.WriteString("# ")
		}
		p.arithmExpr(x.X, false, false)
		p.WriteString("))")
	case *ExtGlob:
		p.WriteString(x.Op.String())
		p.writeLit(x.Pattern.Value)
		p.WriteByte(')')
	case *ProcSubst:
		// avoid conflict with << and others
		if p.wantSpace {
			p.space()
		}
		p.WriteString(x.Op.String())
		p.nestedStmts(x.Stmts, x.Last, x.Rparen)
		p.rightParen(x.Rparen)
	}
}

func (p *Printer) dblQuoted(dq *DblQuoted) {
	if dq.Dollar {
		p.WriteByte('$')
	}
	p.WriteByte('"')
	if len(dq.Parts) > 0 {
		p.wordParts(dq.Parts, true)
	}
	// Add any trailing escaped newlines.
	for p.line < dq.Right.Line() {
		p.WriteString("\\\n")
		p.line++
	}
	p.WriteByte('"')
}

func (p *Printer) wroteIndex(index ArithmExpr) bool {
	if index == nil {
		return false
	}
	p.WriteByte('[')
	p.arithmExpr(index, false, false)
	p.WriteByte(']')
	return true
}

func (p *Printer) paramExp(pe *ParamExp) {
	if pe.nakedIndex() { // arr[x]
		p.writeLit(pe.Param.Value)
		p.wroteIndex(pe.Index)
		return
	}
	if pe.Short { // $var
		p.WriteByte('$')
		p.writeLit(pe.Param.Value)
		return
	}
	// ${var...}
	p.WriteString("${")
	switch {
	case pe.Length:
		p.WriteByte('#')
	case pe.Width:
		p.WriteByte('%')
	case pe.Excl:
		p.WriteByte('!')
	}
	p.writeLit(pe.Param.Value)
	p.wroteIndex(pe.Index)
	switch {
	case pe.Slice != nil:
		p.WriteByte(':')
		p.arithmExpr(pe.Slice.Offset, true, true)
		if pe.Slice.Length != nil {
			p.WriteByte(':')
			p.arithmExpr(pe.Slice.Length, true, false)
		}
	case pe.Repl != nil:
		if pe.Repl.All {
			p.WriteByte('/')
		}
		p.WriteByte('/')
		if pe.Repl.Orig != nil {
			p.word(pe.Repl.Orig)
		}
		p.WriteByte('/')
		if pe.Repl.With != nil {
			p.word(pe.Repl.With)
		}
	case pe.Names != 0:
		p.writeLit(pe.Names.String())
	case pe.Exp != nil:
		p.WriteString(pe.Exp.Op.String())
		if pe.Exp.Word != nil {
			p.word(pe.Exp.Word)
		}
	}
	p.WriteByte('}')
}

func (p *Printer) loop(loop Loop) {
	switch x := loop.(type) {
	case *WordIter:
		p.writeLit(x.Name.Value)
		if x.InPos.IsValid() {
			p.spacedString(" in", Pos{})
			p.wordJoin(x.Items)
		}
	case *CStyleLoop:
		p.WriteString("((")
		if x.Init == nil {
			p.space()
		}
		p.arithmExpr(x.Init, false, false)
		p.WriteString("; ")
		p.arithmExpr(x.Cond, false, false)
		p.WriteString("; ")
		p.arithmExpr(x.Post, false, false)
		p.WriteString("))")
	}
}

func (p *Printer) arithmExpr(expr ArithmExpr, compact, spacePlusMinus bool) {
	if p.minify {
		compact = true
	}
	switch x := expr.(type) {
	case *Word:
		p.word(x)
	case *BinaryArithm:
		if compact {
			p.arithmExpr(x.X, compact, spacePlusMinus)
			p.WriteString(x.Op.String())
			p.arithmExpr(x.Y, compact, false)
		} else {
			p.arithmExpr(x.X, compact, spacePlusMinus)
			if x.Op != Comma {
				p.space()
			}
			p.WriteString(x.Op.String())
			p.space()
			p.arithmExpr(x.Y, compact, false)
		}
	case *UnaryArithm:
		if x.Post {
			p.arithmExpr(x.X, compact, spacePlusMinus)
			p.WriteString(x.Op.String())
		} else {
			if spacePlusMinus {
				switch x.Op {
				case Plus, Minus:
					p.space()
				}
			}
			p.WriteString(x.Op.String())
			p.arithmExpr(x.X, compact, false)
		}
	case *ParenArithm:
		p.WriteByte('(')
		p.arithmExpr(x.X, false, false)
		p.WriteByte(')')
	}
}

func (p *Printer) testExpr(expr TestExpr) {
	switch x := expr.(type) {
	case *Word:
		p.word(x)
	case *BinaryTest:
		p.testExpr(x.X)
		p.space()
		p.WriteString(x.Op.String())
		p.space()
		p.testExpr(x.Y)
	case *UnaryTest:
		p.WriteString(x.Op.String())
		p.space()
		p.testExpr(x.X)
	case *ParenTest:
		p.WriteByte('(')
		p.wantSpace = startsWithLparen(x.X)
		p.testExpr(x.X)
		p.WriteByte(')')
	}
}

func (p *Printer) word(w *Word) {
	p.wordParts(w.Parts, false)
	p.wantSpace = true
}

func (p *Printer) unquotedWord(w *Word) {
	for _, wp := range w.Parts {
		switch x := wp.(type) {
		case *SglQuoted:
			p.writeLit(x.Value)
		case *DblQuoted:
			p.wordParts(x.Parts, true)
		case *Lit:
			for i := 0; i < len(x.Value); i++ {
				if b := x.Value[i]; b == '\\' {
					if i++; i < len(x.Value) {
						p.WriteByte(x.Value[i])
					}
				} else {
					p.WriteByte(b)
				}
			}
		}
	}
}

func (p *Printer) wordJoin(ws []*Word) {
	anyNewline := false
	for _, w := range ws {
		if pos := w.Pos(); pos.Line() > p.line {
			if !anyNewline {
				p.incLevel()
				anyNewline = true
			}
			p.bslashNewl()
		}
		p.spacePad(w.Pos())
		p.word(w)
	}
	if anyNewline {
		p.decLevel()
	}
}

func (p *Printer) casePatternJoin(pats []*Word) {
	anyNewline := false
	for i, w := range pats {
		if i > 0 {
			p.spacedToken("|", Pos{})
		}
		if pos := w.Pos(); pos.Line() > p.line {
			if !anyNewline {
				p.incLevel()
				anyNewline = true
			}
			p.bslashNewl()
		} else {
			p.spacePad(w.Pos())
		}
		p.word(w)
	}
	if anyNewline {
		p.decLevel()
	}
}

func (p *Printer) elemJoin(elems []*ArrayElem, last []Comment) {
	p.incLevel()
	for _, el := range elems {
		var left []Comment
		for _, c := range el.Comments {
			if c.Pos().After(el.Pos()) {
				left = append(left, c)
				break
			}
			p.comments(c)
		}
		if el.Pos().Line() > p.line {
			p.newlines(el.Pos())
			p.spacePad(el.Pos())
		} else if p.wantSpace {
			p.space()
		}
		if p.wroteIndex(el.Index) {
			p.WriteByte('=')
		}
		if el.Value != nil {
			p.word(el.Value)
		}
		p.comments(left...)
	}
	if len(last) > 0 {
		p.comments(last...)
		p.flushComments()
	}
	p.decLevel()
}

func (p *Printer) stmt(s *Stmt) {
	p.wroteSemi = false
	if s.Negated {
		p.spacedString("!", s.Pos())
	}
	var startRedirs int
	if s.Cmd != nil {
		startRedirs = p.command(s.Cmd, s.Redirs)
	}
	p.incLevel()
	for _, r := range s.Redirs[startRedirs:] {
		if r.OpPos.Line() > p.line {
			p.bslashNewl()
		}
		if p.wantSpace {
			p.spacePad(r.Pos())
		}
		if r.N != nil {
			p.writeLit(r.N.Value)
		}
		p.WriteString(r.Op.String())
		if p.spaceRedirects && (r.Op != DplIn && r.Op != DplOut) {
			p.space()
		} else {
			p.wantSpace = true
		}
		p.word(r.Word)
		if r.Op == Hdoc || r.Op == DashHdoc {
			p.pendingHdocs = append(p.pendingHdocs, r)
		}
	}
	p.wroteSemi = true
	switch {
	case s.Semicolon.IsValid() && s.Semicolon.Line() > p.line:
		p.bslashNewl()
		p.WriteByte(';')
	case s.Background:
		if !p.minify {
			p.space()
		}
		p.WriteString("&")
	case s.Coprocess:
		if !p.minify {
			p.space()
		}
		p.WriteString("|&")
	default:
		p.wroteSemi = false
	}
	if p.wroteSemi {
		p.wantSpace = true
	}
	p.decLevel()
}

func (p *Printer) command(cmd Command, redirs []*Redirect) (startRedirs int) {
	p.spacePad(cmd.Pos())
	switch x := cmd.(type) {
	case *CallExpr:
		p.assigns(x.Assigns)
		if len(x.Args) <= 1 {
			p.wordJoin(x.Args)
			return 0
		}
		p.wordJoin(x.Args[:1])
		for _, r := range redirs {
			if r.Pos().After(x.Args[1].Pos()) || r.Op == Hdoc || r.Op == DashHdoc {
				break
			}
			if p.wantSpace {
				p.spacePad(r.Pos())
			}
			if r.N != nil {
				p.writeLit(r.N.Value)
			}
			p.WriteString(r.Op.String())
			if p.spaceRedirects && (r.Op != DplIn && r.Op != DplOut) {
				p.space()
			} else {
				p.wantSpace = true
			}
			p.word(r.Word)
			startRedirs++
		}
		p.wordJoin(x.Args[1:])
	case *Block:
		p.WriteByte('{')
		p.wantSpace = true
		// Forbid "foo()\n{ bar; }"
		p.wantNewline = p.wantNewline || p.funcNextLine
		p.nestedStmts(x.Stmts, x.Last, x.Rbrace)
		p.semiRsrv("}", x.Rbrace)
	case *IfClause:
		p.ifClause(x, false)
	case *Subshell:
		p.WriteByte('(')
		p.wantSpace = len(x.Stmts) > 0 && startsWithLparen(x.Stmts[0])
		p.spacePad(stmtsPos(x.Stmts, x.Last))
		p.nestedStmts(x.Stmts, x.Last, x.Rparen)
		p.wantSpace = false
		p.spacePad(x.Rparen)
		p.rightParen(x.Rparen)
	case *WhileClause:
		if x.Until {
			p.spacedString("until", x.Pos())
		} else {
			p.spacedString("while", x.Pos())
		}
		p.nestedStmts(x.Cond, x.CondLast, Pos{})
		p.semiOrNewl("do", x.DoPos)
		p.nestedStmts(x.Do, x.DoLast, x.DonePos)
		p.semiRsrv("done", x.DonePos)
	case *ForClause:
		if x.Select {
			p.WriteString("select ")
		} else {
			p.WriteString("for ")
		}
		p.loop(x.Loop)
		p.semiOrNewl("do", x.DoPos)
		p.nestedStmts(x.Do, x.DoLast, x.DonePos)
		p.semiRsrv("done", x.DonePos)
	case *BinaryCmd:
		p.stmt(x.X)
		if p.minify || x.Y.Pos().Line() <= p.line {
			// leave p.nestedBinary untouched
			p.spacedToken(x.Op.String(), x.OpPos)
			p.line = x.Y.Pos().Line()
			p.stmt(x.Y)
			break
		}
		indent := !p.nestedBinary
		if indent {
			p.incLevel()
		}
		if p.binNextLine {
			if len(p.pendingHdocs) == 0 {
				p.bslashNewl()
			}
			p.spacedToken(x.Op.String(), x.OpPos)
			if len(x.Y.Comments) > 0 {
				p.wantSpace = false
				p.newline(Pos{})
				p.indent()
				p.comments(x.Y.Comments...)
				p.newline(Pos{})
				p.indent()
			}
		} else {
			p.spacedToken(x.Op.String(), x.OpPos)
			p.line = x.OpPos.Line()
			p.comments(x.Y.Comments...)
			p.newline(Pos{})
			p.indent()
		}
		p.line = x.Y.Pos().Line()
		_, p.nestedBinary = x.Y.Cmd.(*BinaryCmd)
		p.stmt(x.Y)
		if indent {
			p.decLevel()
		}
		p.nestedBinary = false
	case *FuncDecl:
		if x.RsrvWord {
			p.WriteString("function ")
		}
		p.writeLit(x.Name.Value)
		if !x.RsrvWord || x.Parens {
			p.WriteString("()")
		}
		if p.funcNextLine {
			p.newline(Pos{})
			p.indent()
		} else if !x.Parens || !p.minify {
			p.space()
		}
		p.line = x.Body.Pos().Line()
		p.comments(x.Body.Comments...)
		p.stmt(x.Body)
	case *CaseClause:
		p.WriteString("case ")
		p.word(x.Word)
		p.WriteString(" in")
		if p.swtCaseIndent {
			p.incLevel()
		}
		for i, ci := range x.Items {
			var last []Comment
			for i, c := range ci.Comments {
				if c.Pos().After(ci.Pos()) {
					last = ci.Comments[i:]
					break
				}
				p.comments(c)
			}
			p.newlines(ci.Pos())
			p.casePatternJoin(ci.Patterns)
			p.WriteByte(')')
			p.wantSpace = !p.minify

bodyPos := stmtsPos(ci.Stmts, ci.Last)
			bodyEnd := stmtsEnd(ci.Stmts, ci.Last)
			sep := len(ci.Stmts) > 1 || bodyPos.Line() > p.line ||
				(bodyEnd.IsValid() && ci.OpPos.Line() > bodyEnd.Line())
			p.nestedStmts(ci.Stmts, ci.Last, ci.OpPos)
			p.level++
			if !p.minify || i != len(x.Items)-1 {
				if sep {
					p.newlines(ci.OpPos)
					p.wantNewline = true
				}
				p.spacedToken(ci.Op.String(), ci.OpPos)
				// avoid ; directly after tokens like ;;
				p.wroteSemi = true
			}
			p.comments(last...)
			p.flushComments()
			p.level--
		}
		p.comments(x.Last...)
		if p.swtCaseIndent {
			p.flushComments()
			p.decLevel()
		}
		p.semiRsrv("esac", x.Esac)
	case *ArithmCmd:
		p.WriteString("((")
		if x.Unsigned {
			p.WriteString("# ")
		}
		p.arithmExpr(x.X, false, false)
		p.WriteString("))")
	case *TestClause:
		p.WriteString("[[ ")
		p.testExpr(x.X)
		p.spacedString("]]", x.Right)
	case *DeclClause:
		p.spacedString(x.Variant.Value, x.Pos())
		p.assigns(x.Args)
	case *TimeClause:
		p.spacedString("time", x.Pos())
		if x.PosixFormat {
			p.spacedString("-p", x.Pos())
		}
		if x.Stmt != nil {
			p.stmt(x.Stmt)
		}
	case *CoprocClause:
		p.spacedString("coproc", x.Pos())
		if x.Name != nil {
			p.space()
			p.word(x.Name)
		}
		p.space()
		p.stmt(x.Stmt)
	case *LetClause:
		p.spacedString("let", x.Pos())
		for _, n := range x.Exprs {
			p.space()
			p.arithmExpr(n, true, false)
		}
	case *TestDecl:
		p.spacedString("@test", x.Pos())
		p.space()
		p.word(x.Description)
		p.space()
		p.stmt(x.Body)
	default:
		panic(fmt.Sprintf("syntax.Printer: unexpected node type %T", x))
	}
	return startRedirs
}

func (p *Printer) ifClause(ic *IfClause, elif bool) {
	if !elif {
		p.spacedString("if", ic.Pos())
	}
	p.nestedStmts(ic.Cond, ic.CondLast, Pos{})
	p.semiOrNewl("then", ic.ThenPos)
	thenEnd := ic.FiPos
	el := ic.Else
	if el != nil {
		thenEnd = el.Position
	}
	p.nestedStmts(ic.Then, ic.ThenLast, thenEnd)

if el != nil && el.ThenPos.IsValid() {
		p.comments(ic.Last...)
		p.semiRsrv("elif", el.Position)
		p.ifClause(el, true)
		return
	}
	if el == nil {
		p.comments(ic.Last...)
	} else {
		var left []Comment
		for _, c := range ic.Last {
			if c.Pos().After(el.Position) {
				left = append(left, c)
				break
			}
			p.comments(c)
		}
		p.semiRsrv("else", el.Position)
		p.comments(left...)
		p.nestedStmts(el.Then, el.ThenLast, ic.FiPos)
		p.comments(el.Last...)
	}
	p.semiRsrv("fi", ic.FiPos)
}

func startsWithLparen(node Node) bool {
	switch node := node.(type) {
	case *Stmt:
		return startsWithLparen(node.Cmd)
	case *BinaryCmd:
		return startsWithLparen(node.X)
	case *Subshell:
		return true // keep ( (
	case *ArithmCmd:
		return true // keep ( ((
	}
	return false
}

func (p *Printer) stmtList(stmts []*Stmt, last []Comment) {
	sep := p.wantNewline ||
		(len(stmts) > 0 && stmts[0].Pos().Line() > p.line)
	for _, s := range stmts {
		pos := s.Pos()
		var midComs, endComs []Comment
		for _, c := range s.Comments {
			// Comments after the end of this command. Note that
			// this includes "<<EOF # comment".
			if s.Cmd != nil && c.End().After(s.Cmd.End()) {
				endComs = append(endComs, c)
				break
			}
			// Comments between the beginning of the statement and
			// the end of the command.
			if c.Pos().After(pos) {
				midComs = append(midComs, c)
				continue
			}
			// The rest of the comments are before the entire
			// statement.
			p.comments(c)
		}
		if !p.minify || p.wantSpace {
			p.newlines(pos)
		}
		p.line = pos.Line()
		p.comments(midComs...)
		p.stmt(s)
		p.comments(endComs...)
		p.wantNewline = true
	}
	if len(stmts) == 1 && !sep {
		p.wantNewline = false
	}
	p.comments(last...)
}

// extraIndenter ensures that all lines in a '<<-' heredoc body have at least
// baseIndent leading tabs. Those that had more tab indentation than the first
// heredoc line will keep that relative indentation.
type extraIndenter struct {
	bufWriter
	baseIndent int

firstIndent int
	firstChange int
	curLine     []byte
}

func (e *extraIndenter) WriteByte(b byte) error {
	e.curLine = append(e.curLine, b)
	if b != '\n' {
		return nil
	}
	trimmed := bytes.TrimLeft(e.curLine, "\t")
	if len(trimmed) == 1 {
		// no tabs if this is an empty line, i.e. "\n"
		e.bufWriter.Write(trimmed)
		e.curLine = e.curLine[:0]
		return nil
	}

lineIndent := len(e.curLine) - len(trimmed)
	if e.firstIndent < 0 {
		// This is the first heredoc line we add extra indentation to.
		// Keep track of how much we indented.
		e.firstIndent = lineIndent
		e.firstChange = e.baseIndent - lineIndent
		lineIndent = e.baseIndent

} else if lineIndent < e.firstIndent {
		// This line did not have enough indentation; simply indent it
		// like the first line.
		lineIndent = e.firstIndent
	} else {
		// This line had plenty of indentation. Add the extra
		// indentation that the first line had, for consistency.
		lineIndent += e.firstChange
	}
	e.bufWriter.WriteByte(tabwriter.Escape)
	for i := 0; i < lineIndent; i++ {
		e.bufWriter.WriteByte('\t')
	}
	e.bufWriter.WriteByte(tabwriter.Escape)
	e.bufWriter.Write(trimmed)
	e.curLine = e.curLine[:0]
	return nil
}

func (e *extraIndenter) WriteString(s string) (int, error) {
	for i := 0; i < len(s); i++ {
		e.WriteByte(s[i])
	}
	return len(s), nil
}

func (p *Printer) nestedStmts(stmts []*Stmt, last []Comment, closing Pos) {
	p.incLevel()
	switch {
	case len(stmts) > 1:
		// Force a newline if we find:
		//     { stmt; stmt; }
		p.wantNewline = true
	case closing.Line() > p.line && len(stmts) > 0 &&
		stmtsEnd(stmts, last).Line() < closing.Line():
		// Force a newline if we find:
		//     { stmt
		//     }
		p.wantNewline = true
	case len(p.pendingComments) > 0 && len(stmts) > 0:
		// Force a newline if we find:
		//     for i in a b # stmt
		//     do foo; done
		p.wantNewline = true
	}
	p.stmtList(stmts, last)
	if closing.IsValid() {
		p.flushComments()
	}
	p.decLevel()
}

func (p *Printer) assigns(assigns []*Assign) {
	p.incLevel()
	for _, a := range assigns {
		if a.Pos().Line() > p.line {
			p.bslashNewl()
		} else {
			p.spacePad(a.Pos())
		}
		if a.Name != nil {
			p.writeLit(a.Name.Value)
			p.wroteIndex(a.Index)
			if a.Append {
				p.WriteByte('+')
			}
			if !a.Naked {
				p.WriteByte('=')
			}
		}
		if a.Value != nil {
			// Ensure we don't use an escaped newline after '=',
			// because that can result in indentation, thus
			// splitting "foo=bar" into "foo= bar".
			p.line = a.Value.Pos().Line()
			p.word(a.Value)
		} else if a.Array != nil {
			p.wantSpace = false
			p.WriteByte('(')
			p.elemJoin(a.Array.Elems, a.Array.Last)
			p.rightParen(a.Array.Rparen)
		}
		p.wantSpace = true
	}
	p.decLevel()
}
07070100000060000081A4000003E800000064000000016046124D00006DE7000000000000000000000000000000000000002000000000sh-3.2.4/syntax/printer_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"os"
	"strings"
	"testing"
)

func TestPrintCompact(t *testing.T) {
	t.Parallel()
	parserBash := NewParser(KeepComments(true))
	parserPosix := NewParser(KeepComments(true), Variant(LangPOSIX))
	parserMirBSD := NewParser(KeepComments(true), Variant(LangMirBSDKorn))
	parserBats := NewParser(KeepComments(true), Variant(LangBats))
	printer := NewPrinter()
	for i, c := range fileTests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			in := c.Strs[0]
			parser := parserPosix
			if c.Bats != nil {
				parser = parserBats
			} else if c.Bash != nil {
				parser = parserBash
			} else if c.MirBSDKorn != nil {
				parser = parserMirBSD
			}
			printTest(t, parser, printer, in, in)
		})
	}
}

func strPrint(p *Printer, node Node) (string, error) {
	var buf bytes.Buffer
	err := p.Print(&buf, node)
	return buf.String(), err
}

type printCase struct {
	in, want string
}

func samePrint(s string) printCase { return printCase{in: s, want: s} }

samePrint("if a \\\n\t; then b; fi"),
	samePrint("a 'b\nb' c"),
	samePrint("a $'b\nb' c"),
	{
		"(foo; bar)",
		"(\n\tfoo\n\tbar\n)",
	},
	{
		"{\nfoo\nbar; }",
		"{\n\tfoo\n\tbar\n}",
	},
	samePrint("\"$foo\"\n{\n\tbar\n}"),
	{
		"{\nbar\n# extra\n}",
		"{\n\tbar\n\t# extra\n}",
	},
	{
		"foo\nbar  # extra",
		"foo\nbar # extra",
	},
	{
		"foo # 1\nfooo # 2\nfo # 3",
		"foo  # 1\nfooo # 2\nfo   # 3",
	},
	{
		" foo # 1\n fooo # 2\n fo # 3",
		"foo  # 1\nfooo # 2\nfo   # 3",
	},
	{
		"foo   # 1\nfooo  # 2\nfo    # 3",
		"foo  # 1\nfooo # 2\nfo   # 3",
	},
	{
		"foooooa\nfoo # 1\nfooo # 2\nfo # 3\nfooooo",
		"foooooa\nfoo  # 1\nfooo # 2\nfo   # 3\nfooooo",
	},
	{
		"foo\nbar\nfoo # 1\nfooo # 2",
		"foo\nbar\nfoo  # 1\nfooo # 2",
	},
	samePrint("foobar # 1\nfoo\nfoo # 2"),
	samePrint("foobar # 1\n#foo\nfoo # 2"),
	samePrint("foobar # 1\n\nfoo # 2"),
	{
		"foo # 2\nfoo2 bar # 1",
		"foo      # 2\nfoo2 bar # 1",
	},
	{
		"foo bar # 1\n! foo # 2",
		"foo bar # 1\n! foo   # 2",
	},
	{
		"aa #b\nc  #d\ne\nf #g",
		"aa #b\nc  #d\ne\nf #g",
	},
	{
		"{ a; } #x\nbbb #y\n{ #z\n}",
		"{ a; } #x\nbbb    #y\n{      #z\n}",
	},
	{
		"foo; foooo # 1",
		"foo\nfoooo # 1",
	},
	{
		"aaa; b #1\nc #2",
		"aaa\nb #1\nc #2",
	},
	{
		"a #1\nbbb; c #2\nd #3",
		"a #1\nbbb\nc #2\nd #3",
	},
	samePrint("aa #c1\n{  #c2\n\tb\n}"),
	{
		"aa #c1\n{ b; c; } #c2",
		"aa #c1\n{\n\tb\n\tc\n} #c2",
	},
	samePrint("a #c1\n'b\ncc' #c2"),
	{
		"(\nbar\n# extra\n)",
		"(\n\tbar\n\t# extra\n)",
	},
	{
		"for a in 1 2\ndo\n\t# bar\ndone",
		"for a in 1 2; do\n\t# bar\ndone",
	},
	samePrint("#before\nfoo | bar"),
	samePrint("#before\nfoo && bar"),
	samePrint("foo | bar # inline"),
	samePrint("foo && bar # inline"),
	samePrint("for a in 1 2; do\n\n\tbar\ndone"),
	{
		"a \\\n\t&& b",
		"a &&\n\tb",
	},
	{
		"a \\\n\t&& b\nc",
		"a &&\n\tb\nc",
	},
	{
		"{\n(a \\\n&& b)\nc\n}",
		"{\n\t(a &&\n\t\tb)\n\tc\n}",
	},
	{
		"a && b \\\n&& c",
		"a && b &&\n\tc",
	},
	{
		"a \\\n&& $(b) && c \\\n&& d",
		"a &&\n\t$(b) && c &&\n\td",
	},
	{
		"a \\\n&& b\nc \\\n&& d",
		"a &&\n\tb\nc &&\n\td",
	},
	{
		"a \\\n&&\n#c\nb",
		"a &&\n\t#c\n\tb",
	},
	{
		"a | {\nb \\\n| c\n}",
		"a | {\n\tb |\n\t\tc\n}",
	},
	{
		"a \\\n\t&& if foo; then\nbar\nfi",
		"a &&\n\tif foo; then\n\t\tbar\n\tfi",
	},
	{
		"if\nfoo\nthen\nbar\nfi",
		"if\n\tfoo\nthen\n\tbar\nfi",
	},
	{
		"if foo \\\nbar\nthen\nbar\nfi",
		"if foo \\\n\tbar; then\n\tbar\nfi",
	},
	{
		"if foo \\\n&& bar\nthen\nbar\nfi",
		"if foo &&\n\tbar; then\n\tbar\nfi",
	},
	{
		"a |\nb |\nc",
		"a |\n\tb |\n\tc",
	},
	samePrint("a |\n\tb | c |\n\td"),
	samePrint("a | b |\n\tc |\n\td"),
	{
		"foo |\n# misplaced\nbar",
		"foo |\n\t# misplaced\n\tbar",
	},
	samePrint("{\n\tfoo\n\t#a\n\tbar\n} | etc"),
	{
		"foo &&\n#a1\n#a2\n$(bar)",
		"foo &&\n\t#a1\n\t#a2\n\t$(bar)",
	},
	{
		"{\n\tfoo\n\t#a\n} |\n# misplaced\nbar",
		"{\n\tfoo\n\t#a\n} |\n\t# misplaced\n\tbar",
	},
	samePrint("foo | bar\n#after"),
	{
		"a |\nb | #c2\nc",
		"a |\n\tb | #c2\n\tc",
	},
	{
		"{\nfoo &&\n#a1\n#a2\n$(bar)\n}",
		"{\n\tfoo &&\n\t\t#a1\n\t\t#a2\n\t\t$(bar)\n}",
	},
	{
		"foo | while read l; do\nbar\ndone",
		"foo | while read l; do\n\tbar\ndone",
	},
	samePrint("while x; do\n\t#comment\ndone"),
	{
		"while x\ndo\n\ty\ndone",
		"while x; do\n\ty\ndone",
	},
	samePrint("\"\\\nfoo\""),
	samePrint("'\\\nfoo'"),
	samePrint("\"foo\\\n  bar\""),
	samePrint("'foo\\\n  bar'"),
	samePrint("v=\"\\\nfoo\""),
	samePrint("\"\\\n\\\nfoo\\\n\\\n\""),
	samePrint("'\\\n\\\nfoo\\\n\\\n'"),
	{
		"foo \\\n>bar\netc",
		"foo \\\n\t>bar\netc",
	},
	{
		"foo \\\nfoo2 \\\n>bar",
		"foo \\\n\tfoo2 \\\n\t>bar",
	},
	samePrint("> >(foo)"),
	samePrint("x > >(foo) y"),
	samePrint("a | () |\n\tb"),
	samePrint("a | (\n\tx\n\ty\n) |\n\tb"),
	samePrint("a |\n\tif foo; then\n\t\tbar\n\tfi |\n\tb"),
	samePrint("a | if foo; then\n\tbar\nfi"),
	samePrint("a | b | if foo; then\n\tbar\nfi"),
	{
		"case $i in\n1)\nfoo\n;;\nesac",
		"case $i in\n1)\n\tfoo\n\t;;\nesac",
	},
	{
		"case $i in\n1)\nfoo\nesac",
		"case $i in\n1)\n\tfoo\n\t;;\nesac",
	},
	{
		"case $i in\n1) foo\nesac",
		"case $i in\n1) foo ;;\nesac",
	},
	{
		"case $i in\n1) foo; bar\nesac",
		"case $i in\n1)\n\tfoo\n\tbar\n\t;;\nesac",
	},
	{
		"case $i in\n1) foo; bar;;\nesac",
		"case $i in\n1)\n\tfoo\n\tbar\n\t;;\nesac",
	},
	{
		"case $i in\n1)\n#foo \t\n;;\nesac",
		"case $i in\n1)\n\t#foo\n\t;;\nesac",
	},
	samePrint("case $i in\n1)\n\ta\n\t#b\n\t;;\nesac"),
	samePrint("case $i in\n1) foo() { bar; } ;;\nesac"),
	samePrint("case $i in\n1) ;; #foo\nesac"),
	samePrint("case $i in\n#foo\nesac"),
	samePrint("case $i in\n#before\n1) ;;\nesac"),
	samePrint("case $i in\n#bef\n1) ;; #inl\nesac"),
	samePrint("case $i in\n1) ;; #inl1\n2) ;; #inl2\nesac"),
	samePrint("case $i in\n#bef\n1) #inl\n\tfoo\n\t;;\nesac"),
	samePrint("case $i in\n1) #inl\n\t;;\nesac"),
	samePrint("case $i in\n1) a \\\n\tb ;;\nesac"),
	samePrint("case $i in\n1 | 2 | \\\n\t3 | 4) a b ;;\nesac"),
	samePrint("case $i in\n1 | 2 | \\\n\t3 | 4)\n\ta b\n\t;;\nesac"),
	samePrint("case $i in\nx) ;;\ny) for n in 1; do echo $n; done ;;\nesac"),
	samePrint("case a in b) [[ x =~ y ]] ;; esac"),
	samePrint("case a in b) [[ a =~ b$ || c =~ d$ ]] ;; esac"),
	samePrint("case a in b) [[ a =~ (b) ]] ;; esac"),
	samePrint("[[ (a =~ b$) ]]"),
	samePrint("[[ a && ((b || c) && d) ]]"),
	{
		"a=(\nb\nc\n) b=c",
		"a=(\n\tb\n\tc\n) b=c",
	},
	samePrint("a=(\n\t#before\n\tb #inline\n)"),
	samePrint("a=(\n\tb #foo\n\tc #bar\n)"),
	samePrint("a=(\n\tb\n\n\t#foo\n\t#bar\n\tc\n)"),
	samePrint("a=(\n\t#foo\n\t#bar\n\tc\n)"),
	samePrint("a=(\n\t#lone\n)"),
	samePrint("a=(\n\n)"),
	samePrint("a=(\n\tx\n\n\ty\n)"),
	samePrint("foo <<EOF | $(bar)\n3\nEOF"),
	{
		"a <<EOF\n$(\n\tb\n\tc)\nEOF",
		"a <<EOF\n$(\n\tb\n\tc\n)\nEOF",
	},
	samePrint("<<EOF1\n$(\n\t<<EOF2\ninner\nEOF2\n)\nEOF1"),
	{
		"<(<<EOF\nbody\nEOF\n)",
		"<(\n\t<<EOF\nbody\nEOF\n)",
	},
	{
		"( (foo) )\n$( (foo) )\n<( (foo) )",
		"( (foo))\n$( (foo))\n<((foo))",
	},
	{
		"if ( ((foo)) || bar ); then baz; fi",
		"if ( ((foo)) || bar); then baz; fi",
	},
	samePrint("if x; then (\n\ty\n) & fi"),
	samePrint("\"foo\n$(bar)\""),
	samePrint("\"foo\\\n$(bar)\""),
	samePrint("\"foo\\\nbar\""),
	samePrint("((foo++)) || bar"),
	{
		"a=b \\\nc=d \\\nfoo",
		"a=b \\\n\tc=d \\\n\tfoo",
	},
	{
		"a=b \\\nc=d \\\nfoo \\\nbar",
		"a=b \\\n\tc=d \\\n\tfoo \\\n\tbar",
	},
	samePrint("a $(x) \\\n\tb"),
	samePrint("\"foo\nbar\"\netc"),
	samePrint("\"foo\nbar\nbar2\"\netc"),
	samePrint("a=\"$b\n\"\nd=e"),
	samePrint("\"\n\"\n\nfoo"),
	samePrint("$\"\n\"\n\nfoo"),
	samePrint("'\n'\n\nfoo"),
	samePrint("$'\n'\n\nfoo"),
	samePrint("foo <<EOF\na\nb\nc\nd\nEOF\n{\n\tbar\n}"),
	samePrint("foo bar # one\nif a; then\n\tb\nfi # two"),
	{
		"# foo\n\n\nbar",
		"# foo\n\nbar",
	},
	{
		"# foo\n\n\nbar\nbaz",
		"# foo\n\nbar\nbaz",
	},
	samePrint("#foo\n#\n#bar"),
	{
		"(0 #\n0)#\n0",
		"(\n\t0 #\n\t0\n) #\n0",
	},
	samePrint("a | #c1\n\t(\n\t\tb\n\t)"),
	samePrint("a | #c1\n\t{\n\t\tb\n\t}"),
	samePrint("a | #c1\n\tif b; then\n\t\tc\n\tfi"),
	samePrint("a | #c1\n\t#c2\n\t#c3\n\tb"),
	samePrint("a && #c1\n\t(\n\t\tb\n\t)"),
	samePrint("f() body # comment"),
	samePrint("f <<EOF\nbody\nEOF"),
	samePrint("f <<EOF\nEOF"),
	samePrint("f <<-EOF\n\tbody\nEOF"),
	{
		"f <<-EOF\nbody\nEOF",
		"f <<-EOF\n\tbody\nEOF",
	},
	samePrint("f <<-EOF\nEOF"),
	samePrint("f <<-EOF\n\n\nEOF"),
	samePrint("f <<-EOF\n\n\tindented\n\nEOF"),
	samePrint("{\n\tf <<EOF\nEOF\n}"),
	samePrint("{\n\tf <<-EOF\n\t\tbody\n\tEOF\n}"),
	samePrint("{\n\tf <<-EOF\n\t\tbody\n\tEOF\n\tf2\n}"),
	samePrint("f <<-EOF\n\t{\n\t\tnicely indented\n\t}\nEOF"),
	samePrint("f <<-EOF\n\t{\n\t\tnicely indented\n\t}\nEOF"),
	{
		"f <<-EOF\n\t{\nbadly indented\n\t}\nEOF",
		"f <<-EOF\n\t{\n\tbadly indented\n\t}\nEOF",
	},
	{
		"f <<-EOF\n\t\t{\n\t\t\ttoo indented\n\t\t}\nEOF",
		"f <<-EOF\n\t{\n\t\ttoo indented\n\t}\nEOF",
	},
	{
		"f <<-EOF\n{\n\ttoo little indented\n}\nEOF",
		"f <<-EOF\n\t{\n\t\ttoo little indented\n\t}\nEOF",
	},
	samePrint("<<-EOF\n\t$foo\nEOF\n\n{\n\tbar\n}"),
	samePrint("f <<EOF\nEOF\n# comment"),
	samePrint("f <<EOF\nEOF\n# comment\nbar"),
	samePrint("f <<EOF # inline\n$(\n\t# inside\n)\nEOF\n# outside\nbar"),
	samePrint("while foo; do\n\tbar\ndone <<-EOF # inline\n\tbaz\nEOF"),
	samePrint("{\n\tcat <<EOF\nEOF\n\t# comment\n}"),
	{
		"if foo # inline\nthen\n\tbar\nfi",
		"if foo; then # inline\n\tbar\nfi",
	},
	samePrint("for i; do echo $i; done"),
	samePrint("for i in; do echo $i; done"),
	{
		"for foo in a b # inline\ndo\n\tbar\ndone",
		"for foo in a b; do # inline\n\tbar\ndone",
	},
	{
		"if x # inline\nthen bar; fi",
		"if x; then # inline\n\tbar\nfi",
	},
	{
		"for i in a b # inline\ndo bar; done",
		"for i in a b; do # inline\n\tbar\ndone",
	},
	{
		"for i #a\n\tin 1; do #b\ndone",
		"for i in \\\n\t1; do #a\n\t#b\ndone",
	},
	{
		"foo() # inline\n{\n\tbar\n}",
		"foo() { # inline\n\tbar\n}",
	},
	samePrint("if foo; then\n\tbar\n\t# comment\nfi"),
	samePrint("if foo; then\n\tbar\n# else commented out\nfi"),
	samePrint("if foo; then\n\tx\nelse\n\tbar\n\t# comment\nfi"),
	samePrint("if foo; then\n\tx\n#comment\nelse\n\ty\nfi"),
	samePrint("if foo; then\n\tx\n\t#comment\nelse\n\ty\nfi"),
	{
		"if foo; then\n\tx\n#a\n\t#b\n\t#c\nelse\n\ty\nfi",
		"if foo; then\n\tx\n\t#a\n\t#b\n\t#c\nelse\n\ty\nfi",
	},
	samePrint("if foo; then\n\tx\nelse #comment\n\ty\nfi"),
	samePrint("if foo; then\n\tx\n#comment\nelif bar; then\n\ty\nfi"),
	samePrint("if foo; then\n\tx\n\t#comment\nelif bar; then\n\ty\nfi"),
	samePrint("case i in\nx)\n\ta\n\t;;\n#comment\ny) ;;\nesac"),
	samePrint("case i in\nx)\n\ta\n\t;;\n\t#comment\ny) ;;\nesac"),
	{
		"case i in\nx)\n\ta\n\t;;\n\t#a\n#b\n\t#c\ny) ;;\nesac",
		"case i in\nx)\n\ta\n\t;;\n\t#a\n\t#b\n\t#c\ny) ;;\nesac",
	},
	samePrint("'foo\tbar'\n'foooo\tbar'"),
	samePrint("\"foo\tbar\"\n\"foooo\tbar\""),
	samePrint("foo\\\tbar\nfoooo\\\tbar"),
	samePrint("#foo\tbar\n#foooo\tbar"),
	{
		"array=('one'\n\t\t# 'two'\n\t\t'three')",
		"array=('one'\n\t# 'two'\n\t'three')",
	},
	samePrint("#comment\n>redir"),
}

func TestPrintWeirdFormat(t *testing.T) {
	t.Parallel()
	parser := NewParser(KeepComments(true))
	printer := NewPrinter()
	for i, tc := range printTests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
		t.Run(fmt.Sprintf("%03d-nl", i), func(t *testing.T) {
			printTest(t, parser, printer, "\n"+tc.in+"\n", tc.want)
		})
		t.Run(fmt.Sprintf("%03d-redo", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.want, tc.want)
		})
	}
}

func parsePath(tb testing.TB, path string) *File {
	f, err := os.Open(path)
	if err != nil {
		tb.Fatal(err)
	}
	defer f.Close()
	prog, err := NewParser(KeepComments(true)).Parse(f, "")
	if err != nil {
		tb.Fatal(err)
	}
	return prog
}

const canonicalPath = "canonical.sh"

func TestPrintMultiline(t *testing.T) {
	t.Parallel()
	prog := parsePath(t, canonicalPath)
	got, err := strPrint(NewPrinter(), prog)
	if err != nil {
		t.Fatal(err)
	}

wantBs, err := ioutil.ReadFile(canonicalPath)
	if err != nil {
		t.Fatal(err)
	}

// If we're on Windows and it was set up to automatically replace LF
	// with CRLF, that might make this test fail. Just ignore \r characters.
	want := strings.Replace(string(wantBs), "\r", "", -1)
	got = strings.Replace(got, "\r", "", -1)
	if got != want {
		t.Fatalf("Print mismatch in canonical.sh")
	}
}

func BenchmarkPrint(b *testing.B) {
	b.ReportAllocs()
	prog := parsePath(b, canonicalPath)
	printer := NewPrinter()
	for i := 0; i < b.N; i++ {
		if err := printer.Print(ioutil.Discard, prog); err != nil {
			b.Fatal(err)
		}
	}
}

func TestPrintSpaces(t *testing.T) {
	t.Parallel()
	spaceFormats := [...]struct {
		spaces   uint
		in, want string
	}{
		{
			0,
			"{\nfoo \\\nbar\n}",
			"{\n\tfoo \\\n\t\tbar\n}",
		},
		{
			2,
			"{\nfoo \\\nbar\n}",
			"{\n  foo \\\n    bar\n}",
		},
		{
			4,
			"{\nfoo \\\nbar\n}",
			"{\n    foo \\\n        bar\n}",
		},
		{
			2,
			"if foo; then # inline1\nbar # inline2\n# withfi\nfi",
			"if foo; then # inline1\n  bar        # inline2\n# withfi\nfi",
		},
		{
			2,
			"array=('one'\n    # 'two'\n    'three')",
			"array=('one'\n  # 'two'\n  'three')",
		},
	}

parser := NewParser(KeepComments(true))
	for i, tc := range spaceFormats {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printer := NewPrinter(Indent(tc.spaces))
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

var errBadWriter = fmt.Errorf("write: expected error")

type badWriter struct{}

func (b badWriter) Write(p []byte) (int, error) { return 0, errBadWriter }

func TestWriteErr(t *testing.T) {
	t.Parallel()
	f := &File{Stmts: []*Stmt{
		{
			Redirs: []*Redirect{{
				Op:   RdrOut,
				Word: litWord("foo"),
			}},
			Cmd: &Subshell{},
		},
	}}
	err := NewPrinter().Print(badWriter{}, f)
	if err == nil {
		t.Fatalf("Expected error with bad writer")
	}
	if err != errBadWriter {
		t.Fatalf("Error mismatch with bad writer:\nwant: %v\ngot:  %v",
			errBadWriter, err)
	}
}

func TestPrintBinaryNextLine(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		{
			"foo <<EOF &&\nl1\nEOF\nbar",
			"foo <<EOF && bar\nl1\nEOF",
		},
		samePrint("a \\\n\t&& b"),
		samePrint("a \\\n\t&& b\nc"),
		{
			"{\n(a \\\n&& b)\nc\n}",
			"{\n\t(a \\\n\t\t&& b)\n\tc\n}",
		},
		{
			"a && b \\\n&& c",
			"a && b \\\n\t&& c",
		},
		{
			"a \\\n&& $(b) && c \\\n&& d",
			"a \\\n\t&& $(b) && c \\\n\t&& d",
		},
		{
			"a \\\n&& b\nc \\\n&& d",
			"a \\\n\t&& b\nc \\\n\t&& d",
		},
		{
			"a | {\nb \\\n| c\n}",
			"a | {\n\tb \\\n\t\t| c\n}",
		},
		{
			"a \\\n\t&& if foo; then\nbar\nfi",
			"a \\\n\t&& if foo; then\n\t\tbar\n\tfi",
		},
		{
			"if foo \\\n&& bar\nthen\nbar\nfi",
			"if foo \\\n\t&& bar; then\n\tbar\nfi",
		},
		{
			"a |\nb |\nc",
			"a \\\n\t| b \\\n\t| c",
		},
		{
			"foo |\n# misplaced\nbar",
			"foo \\\n\t|\n\t# misplaced\n\tbar",
		},
		samePrint("{\n\tfoo\n\t#a\n\tbar\n} | etc"),
		{
			"foo &&\n#a1\n#a2\n$(bar)",
			"foo \\\n\t&&\n\t#a1\n\t#a2\n\t$(bar)",
		},
		{
			"{\n\tfoo\n\t#a\n} |\n# misplaced\nbar",
			"{\n\tfoo\n\t#a\n} \\\n\t|\n\t# misplaced\n\tbar",
		},
		samePrint("foo | bar\n#after"),
		{
			"a |\nb | #c2\nc",
			"a \\\n\t| b \\\n\t|\n\t#c2\n\tc",
		},
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(BinaryNextLine(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintSwitchCaseIndent(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		{
			"case $i in\n1)\nfoo\n;;\nesac",
			"case $i in\n\t1)\n\t\tfoo\n\t\t;;\nesac",
		},
		{
			"case $i in\n1)\na\n;;\n2)\nb\n;;\nesac",
			"case $i in\n\t1)\n\t\ta\n\t\t;;\n\t2)\n\t\tb\n\t\t;;\nesac",
		},
		samePrint("case $i in\n\t#foo\nesac"),
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(SwitchCaseIndent(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintFunctionNextLine(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		{
			"foo() { bar; }",
			"foo()\n{\n\tbar\n}",
		},
		{
			"foo()\n{ bar; }",
			"foo()\n{\n\tbar\n}",
		},
		{
			"foo()\n\n{\n\n\tbar\n}",
			"foo()\n{\n\n\tbar\n}",
		},
		{
			"function foo {\n\tbar\n}",
			"function foo\n{\n\tbar\n}",
		},
		{
			"function foo() {\n\tbar\n}",
			"function foo()\n{\n\tbar\n}",
		},
		{
			"{ foo() { bar; }; }",
			"{\n\tfoo()\n\t{\n\t\tbar\n\t}\n}",
		},
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(FunctionNextLine(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintSpaceRedirects(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		samePrint("echo foo bar > f"),
		samePrint("echo > f foo bar"),
		samePrint("echo >(cmd)"),
		samePrint("echo > >(cmd)"),
		samePrint("<< EOF\nfoo\nEOF"),
		samePrint("<<- EOF\n\t$(< foo)\nEOF"),
		samePrint("echo 2> f"),
		samePrint("echo foo bar >&1"),
		samePrint("echo 2<&1 foo bar"),
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(SpaceRedirects(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintKeepPadding(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		samePrint("echo foo bar"),
		samePrint("echo  foo   bar"),
		samePrint("a=b  c=d   bar"),
		samePrint("echo foo    >bar"),
		samePrint("echo foo    2>bar"),
		samePrint("{ foo;  }"),
		samePrint("a()   { foo; }"),
		samePrint("a   && b"),
		samePrint("a   | b"),
		samePrint("a |  b"),
		samePrint("{  a b c; }"),
		samePrint("foo    # x\nbaaar  # y"),
		samePrint("{ { a; }; }"),
		samePrint("{  a;  }"),
		samePrint("(  a   )"),
		samePrint("'foo\nbar'   # x"),
		{"\tfoo", "foo"},
		{"  if foo; then bar; fi", "if   foo; then bar; fi"},
		samePrint("echo '★'  || true"),
		{
			"1234 || { x; y; }",
			"1234 || {\n\tx\n\ty\n}",
		},
		{
			"array=('one'\n\t\t# 'two'\n\t\t'three')",
			"array=('one'\n\t# 'two'\n\t'three')",
		},
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(KeepPadding(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			// ensure that Reset does properly reset colCounter
			printer.WriteByte('x')
			printer.Reset(nil)
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintKeepPaddingSpaces(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		samePrint("array=('one'\n        # 'two'\n        'three')"),
		samePrint("    abc=123"),
		samePrint("foo \\\n  bar \\\n    baz"),
		samePrint("{\n  foo\n    bar\n}"),
		samePrint("# foo\n  # bar"),
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(KeepPadding(true), Indent(2))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintMinify(t *testing.T) {
	t.Parallel()
	tests := [...]printCase{
		samePrint("echo foo bar $a $(b)"),
		{
			"#comment",
			"",
		},
		{
			"foo #comment",
			"foo",
		},
		{
			"foo\n\nbar",
			"foo\nbar",
		},
		{
			"foo &",
			"foo&",
		},
		samePrint("foo >bar 2>baz <etc"),
		{
			"{\n\tfoo\n}",
			"{\nfoo\n}",
		},
		{
			"(\n\ta\n)\n(\n\tb\n\tc\n)",
			"(a)\n(b\nc)",
		},
		{
			"$(\n\ta\n)\n$(\n\tb\n\tc\n)",
			"$(a)\n$(b\nc)",
		},
		{
			"f() { x; }",
			"f(){ x;}",
		},
		{
			"((1 + 2))",
			"((1+2))",
		},
		{
			"echo $a ${b} ${c}-d ${e}f ${g}_h",
			"echo $a $b $c-d ${e}f ${g}_h",
		},
		{
			"echo ${0} ${3} ${10} ${22}",
			"echo $0 $3 ${10} ${22}",
		},
		{
			"case $a in\nx) c ;;\ny | z)\n\td\n\t;;\nesac",
			"case $a in\nx)c;;\ny|z)d\nesac",
		},
		{
			"a && b | c",
			"a&&b|c",
		},
		{
			"a &&\n\tb |\n\tc",
			"a&&b|c",
		},
		{
			"${0/${a}\\\n}",
			"${0/$a/}",
		},
		samePrint("foo >bar 2>baz <etc"),
		samePrint("<<-EOF\n$(a|b)\nEOF"),
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter(Minify(true))
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			printTest(t, parser, printer, tc.in, tc.want)
		})
	}
}

func TestPrintMinifyNotBroken(t *testing.T) {
	t.Parallel()
	parserBash := NewParser(KeepComments(true))
	parserPosix := NewParser(KeepComments(true), Variant(LangPOSIX))
	parserMirBSD := NewParser(KeepComments(true), Variant(LangMirBSDKorn))
	parserBats := NewParser(KeepComments(true), Variant(LangBats))
	printer := NewPrinter(Minify(true))
	for i, tc := range fileTests {
		t.Run(fmt.Sprintf("File%03d", i), func(t *testing.T) {
			parser := parserPosix
			if tc.Bats != nil {
				parser = parserBats
			} else if tc.Bash != nil {
				parser = parserBash
			} else if tc.MirBSDKorn != nil {
				parser = parserMirBSD
			}
			in := tc.Strs[0]
			prog, err := parser.Parse(strings.NewReader(in), "")
			if err != nil {
				t.Fatal(err)
			}
			got, err := strPrint(printer, prog)
			if err != nil {
				t.Fatal(err)
			}
			_, err = parser.Parse(strings.NewReader(got), "")
			if err != nil {
				t.Fatalf("minified program was broken: %v\n%s", err, got)
			}
		})
	}
	for i, tc := range printTests {
		t.Run(fmt.Sprintf("Print%03d", i), func(t *testing.T) {
			prog, err := parserBash.Parse(strings.NewReader(tc.in), "")
			if err != nil {
				t.Fatal(err)
			}
			got, err := strPrint(printer, prog)
			if err != nil {
				t.Fatal(err)
			}
			_, err = parserBash.Parse(strings.NewReader(got), "")
			if err != nil {
				t.Fatalf("minified program was broken: %v\n%s", err, got)
			}
		})
	}
}

func printTest(t *testing.T, parser *Parser, printer *Printer, in, want string) {
	t.Helper()
	prog, err := parser.Parse(strings.NewReader(in), "")
	if err != nil {
		t.Fatal(err)
	}
	wantNewl := want + "\n"
	got, err := strPrint(printer, prog)
	if err != nil {
		t.Fatal(err)
	}
	if got != wantNewl {
		t.Fatalf("Print mismatch:\nin:\n%q\nwant:\n%q\ngot:\n%q",
			in, wantNewl, got)
	}
	_, err = parser.Parse(strings.NewReader(want), "")
	if err != nil {
		t.Fatalf("Result is not valid shell:\n%s", want)
	}
}

func TestPrintNodeTypes(t *testing.T) {
	t.Parallel()

multiline, err := NewParser().Parse(strings.NewReader(`
		echo foo
	`), "")
	if err != nil {
		t.Fatal(err)
	}

tests := [...]struct {
		in      Node
		want    string
		wantErr bool
	}{
		{
			in:   &File{Stmts: litStmts("foo")},
			want: "foo\n",
		},
		{
			in:   &File{Stmts: litStmts("foo", "bar")},
			want: "foo\nbar\n",
		},
		{
			in:   litStmt("foo", "bar"),
			want: "foo bar",
		},
		{
			in:   litCall("foo", "bar"),
			want: "foo bar",
		},
		{
			in:   litWord("foo"),
			want: "foo",
		},
		{
			in:   lit("foo"),
			want: "foo",
		},
		{
			in:   sglQuoted("foo"),
			want: "'foo'",
		},
		{
			in:      &Comment{},
			wantErr: true,
		},
		{
			in:   multiline.Stmts[0],
			want: "echo foo",
		},
		{
			in:   multiline.Stmts[0].Cmd,
			want: "echo foo",
		},
		{
			in:   multiline.Stmts[0].Cmd.(*CallExpr).Args[0],
			want: "echo",
		},
		{
			in:   multiline.Stmts[0].Cmd.(*CallExpr).Args[0].Parts[0],
			want: "echo",
		},
	}
	printer := NewPrinter()
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			got, err := strPrint(printer, tc.in)
			if err == nil && tc.wantErr {
				t.Fatalf("wanted an error but found none")
			} else if err != nil && !tc.wantErr {
				t.Fatalf("didn't want an error but got %v", err)
			}
			if got != tc.want {
				t.Fatalf("Print mismatch:\nwant:\n%s\ngot:\n%s",
					tc.want, got)
			}
		})
	}
}

func TestPrintManyStmts(t *testing.T) {
	t.Parallel()
	tests := [...]struct {
		in, want string
	}{
		{"foo; bar", "foo\nbar\n"},
		{"foo\nbar", "foo\nbar\n"},
		{"\n\nfoo\nbar\n\n", "foo\nbar\n"},
		{"foo\nbar <<EOF\nbody\nEOF\n", "foo\nbar <<EOF\nbody\nEOF\n"},
		{"foo\nbar # inline", "foo\nbar # inline\n"},
		{"# comment before\nfoo bar", "# comment before\nfoo bar\n"},
	}
	parser := NewParser(KeepComments(true))
	printer := NewPrinter()
	for i, tc := range tests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			f, err := parser.Parse(strings.NewReader(tc.in), "")
			if err != nil {
				t.Fatal(err)
			}
			var buf bytes.Buffer
			for _, stmt := range f.Stmts {
				printer.Print(&buf, stmt)
				buf.WriteByte('\n')
			}
			got := buf.String()
			if got != tc.want {
				t.Fatalf("Print mismatch:\nwant:\n%s\ngot:\n%s",
					tc.want, got)
			}
		})
	}
}

func TestKeepPaddingRepeated(t *testing.T) {
	t.Parallel()
	parser := NewParser()
	printer := NewPrinter()

// Enable the KeepPadding option twice. This used to crash, since the
	// option made an invalid type assertion the second time.
	KeepPadding(true)(printer)
	KeepPadding(true)(printer)

// Ensure the option is enabled.
	printTest(t, parser, printer, "foo  bar", "foo  bar")

// Disable the option, and ensure it's disabled.
	KeepPadding(false)(printer)
	printTest(t, parser, printer, "foo  bar", "foo bar")
}
07070100000061000081A4000003E800000064000000016046124D00000729000000000000000000000000000000000000002500000000sh-3.2.4/syntax/quotestate_string.go// Code generated by "stringer -type=quoteState"; DO NOT EDIT.

package syntax

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[noState-1]
	_ = x[subCmd-2]
	_ = x[subCmdBckquo-4]
	_ = x[dblQuotes-8]
	_ = x[hdocWord-16]
	_ = x[hdocBody-32]
	_ = x[hdocBodyTabs-64]
	_ = x[arithmExpr-128]
	_ = x[arithmExprLet-256]
	_ = x[arithmExprCmd-512]
	_ = x[arithmExprBrack-1024]
	_ = x[testExpr-2048]
	_ = x[testExprRegexp-4096]
	_ = x[switchCase-8192]
	_ = x[paramExpName-16384]
	_ = x[paramExpSlice-32768]
	_ = x[paramExpRepl-65536]
	_ = x[paramExpExp-131072]
	_ = x[arrayElems-262144]
}

const _quoteState_name = "noStatesubCmdsubCmdBckquodblQuoteshdocWordhdocBodyhdocBodyTabsarithmExprarithmExprLetarithmExprCmdarithmExprBracktestExprtestExprRegexpswitchCaseparamExpNameparamExpSliceparamExpReplparamExpExparrayElems"

var _quoteState_map = map[quoteState]string{
	1:      _quoteState_name[0:7],
	2:      _quoteState_name[7:13],
	4:      _quoteState_name[13:25],
	8:      _quoteState_name[25:34],
	16:     _quoteState_name[34:42],
	32:     _quoteState_name[42:50],
	64:     _quoteState_name[50:62],
	128:    _quoteState_name[62:72],
	256:    _quoteState_name[72:85],
	512:    _quoteState_name[85:98],
	1024:   _quoteState_name[98:113],
	2048:   _quoteState_name[113:121],
	4096:   _quoteState_name[121:135],
	8192:   _quoteState_name[135:145],
	16384:  _quoteState_name[145:157],
	32768:  _quoteState_name[157:170],
	65536:  _quoteState_name[170:182],
	131072: _quoteState_name[182:193],
	262144: _quoteState_name[193:203],
}

func (i quoteState) String() string {
	if str, ok := _quoteState_map[i]; ok {
		return str
	}
	return "quoteState(" + strconv.FormatInt(int64(i), 10) + ")"
}
07070100000062000081A4000003E800000064000000016046124D0000159E000000000000000000000000000000000000001C00000000sh-3.2.4/syntax/simplify.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import "bytes"

// Simplify modifies a node to remove redundant pieces of syntax, and returns
// whether any changes were made.
//
// The changes currently applied are:
//
//     Remove clearly useless parentheses       $(( (expr) ))
//     Remove dollars from vars in exprs        (($var))
//     Remove duplicate subshells               $( (stmts) )
//     Remove redundant quotes                  [[ "$var" == str ]]
//     Merge negations with unary operators     [[ ! -n $var ]]
//     Use single quotes to shorten literals    "\$foo"
func Simplify(n Node) bool {
	s := simplifier{}
	Walk(n, s.visit)
	return s.modified
}

type simplifier struct {
	modified bool
}

func (s *simplifier) visit(node Node) bool {
	switch x := node.(type) {
	case *Assign:
		x.Index = s.removeParensArithm(x.Index)
		// Don't inline params, as x[i] and x[$i] mean
		// different things when x is an associative
		// array; the first means "i", the second "$i".
	case *ParamExp:
		x.Index = s.removeParensArithm(x.Index)
		// don't inline params - same as above.

if x.Slice == nil {
			break
		}
		x.Slice.Offset = s.removeParensArithm(x.Slice.Offset)
		x.Slice.Offset = s.inlineSimpleParams(x.Slice.Offset)
		x.Slice.Length = s.removeParensArithm(x.Slice.Length)
		x.Slice.Length = s.inlineSimpleParams(x.Slice.Length)
	case *ArithmExp:
		x.X = s.removeParensArithm(x.X)
		x.X = s.inlineSimpleParams(x.X)
	case *ArithmCmd:
		x.X = s.removeParensArithm(x.X)
		x.X = s.inlineSimpleParams(x.X)
	case *ParenArithm:
		x.X = s.removeParensArithm(x.X)
		x.X = s.inlineSimpleParams(x.X)
	case *BinaryArithm:
		x.X = s.inlineSimpleParams(x.X)
		x.Y = s.inlineSimpleParams(x.Y)
	case *CmdSubst:
		x.Stmts = s.inlineSubshell(x.Stmts)
	case *Subshell:
		x.Stmts = s.inlineSubshell(x.Stmts)
	case *Word:
		x.Parts = s.simplifyWord(x.Parts)
	case *TestClause:
		x.X = s.removeParensTest(x.X)
		x.X = s.removeNegateTest(x.X)
	case *ParenTest:
		x.X = s.removeParensTest(x.X)
		x.X = s.removeNegateTest(x.X)
	case *BinaryTest:
		x.X = s.unquoteParams(x.X)
		x.X = s.removeNegateTest(x.X)
		if x.Op == TsMatchShort {
			s.modified = true
			x.Op = TsMatch
		}
		switch x.Op {
		case TsMatch, TsNoMatch:
			// unquoting enables globbing
		default:
			x.Y = s.unquoteParams(x.Y)
		}
		x.Y = s.removeNegateTest(x.Y)
	case *UnaryTest:
		x.X = s.unquoteParams(x.X)
	}
	return true
}

func (s *simplifier) simplifyWord(wps []WordPart) []WordPart {
parts:
	for i, wp := range wps {
		dq, _ := wp.(*DblQuoted)
		if dq == nil || len(dq.Parts) != 1 {
			break
		}
		lit, _ := dq.Parts[0].(*Lit)
		if lit == nil {
			break
		}
		var buf bytes.Buffer
		escaped := false
		for _, r := range lit.Value {
			switch r {
			case '\\':
				escaped = !escaped
				if escaped {
					continue
				}
			case '\'':
				continue parts
			case '$', '"', '`':
				escaped = false
			default:
				if escaped {
					continue parts
				}
				escaped = false
			}
			buf.WriteRune(r)
		}
		newVal := buf.String()
		if newVal == lit.Value {
			break
		}
		s.modified = true
		wps[i] = &SglQuoted{
			Left:   dq.Pos(),
			Right:  dq.End(),
			Dollar: dq.Dollar,
			Value:  newVal,
		}
	}
	return wps
}

func (s *simplifier) removeParensArithm(x ArithmExpr) ArithmExpr {
	for {
		par, _ := x.(*ParenArithm)
		if par == nil {
			return x
		}
		s.modified = true
		x = par.X
	}
}

func (s *simplifier) inlineSimpleParams(x ArithmExpr) ArithmExpr {
	w, _ := x.(*Word)
	if w == nil || len(w.Parts) != 1 {
		return x
	}
	pe, _ := w.Parts[0].(*ParamExp)
	if pe == nil || !ValidName(pe.Param.Value) {
		// Not a parameter expansion, or not a valid name, like $3.
		return x
	}
	if pe.Excl || pe.Length || pe.Width || pe.Slice != nil ||
		pe.Repl != nil || pe.Exp != nil || pe.Index != nil {
		// A complex parameter expansion can't be simplified.
		//
		// Note that index expressions can't generally be simplified
		// either. It's fine to turn ${a[0]} into a[0], but others like
		// a[*] are invalid in many shells including Bash.
		return x
	}
	s.modified = true
	return &Word{Parts: []WordPart{pe.Param}}
}

func (s *simplifier) inlineSubshell(stmts []*Stmt) []*Stmt {
	for len(stmts) == 1 {
		st := stmts[0]
		if st.Negated || st.Background || st.Coprocess ||
			len(st.Redirs) > 0 {
			break
		}
		sub, _ := st.Cmd.(*Subshell)
		if sub == nil {
			break
		}
		s.modified = true
		stmts = sub.Stmts
	}
	return stmts
}

func (s *simplifier) unquoteParams(x TestExpr) TestExpr {
	w, _ := x.(*Word)
	if w == nil || len(w.Parts) != 1 {
		return x
	}
	dq, _ := w.Parts[0].(*DblQuoted)
	if dq == nil || len(dq.Parts) != 1 {
		return x
	}
	if _, ok := dq.Parts[0].(*ParamExp); !ok {
		return x
	}
	s.modified = true
	w.Parts = dq.Parts
	return w
}

func (s *simplifier) removeParensTest(x TestExpr) TestExpr {
	for {
		par, _ := x.(*ParenTest)
		if par == nil {
			return x
		}
		s.modified = true
		x = par.X
	}
}

func (s *simplifier) removeNegateTest(x TestExpr) TestExpr {
	u, _ := x.(*UnaryTest)
	if u == nil || u.Op != TsNot {
		return x
	}
	switch y := u.X.(type) {
	case *UnaryTest:
		switch y.Op {
		case TsEmpStr:
			y.Op = TsNempStr
			s.modified = true
			return y
		case TsNempStr:
			y.Op = TsEmpStr
			s.modified = true
			return y
		case TsNot:
			s.modified = true
			return y.X
		}
	case *BinaryTest:
		switch y.Op {
		case TsMatch:
			y.Op = TsNoMatch
			s.modified = true
			return y
		case TsNoMatch:
			y.Op = TsMatch
			s.modified = true
			return y
		}
	}
	return x
}
07070100000063000081A4000003E800000064000000016046124D0000097E000000000000000000000000000000000000002100000000sh-3.2.4/syntax/simplify_test.go// Copyright (c) 2017, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"bytes"
	"fmt"
	"strings"
	"testing"
)

type simplifyTest struct {
	in, want string
}

func noSimple(in string) simplifyTest {
	return simplifyTest{in: in, want: in}
}

var simplifyTests = [...]simplifyTest{
	// arithmetic exprs
	{"$((a + ((b - c))))", "$((a + (b - c)))"},
	{"$((a + (((b - c)))))", "$((a + (b - c)))"},
	{"$(((b - c)))", "$((b - c))"},
	{"(((b - c)))", "((b - c))"},
	{"${foo[(1)]}", "${foo[1]}"},
	{"${foo:(1):(2)}", "${foo:1:2}"},
	{"a[(1)]=2", "a[1]=2"},
	{"$(($a + ${b}))", "$((a + b))"},
	noSimple("$((${!a} + ${#b}))"),
	noSimple("a[$b]=2"),
	noSimple("${a[$b]}"),
	noSimple("${a[@]}"),
	noSimple("((${a[@]}))"),
	noSimple("((${a[*]}))"),
	noSimple("((${a[0]}))"),
	noSimple("(($3 == $#))"),

// test exprs
	{`[[ "$foo" == "bar" ]]`, `[[ $foo == "bar" ]]`},
	{`[[ (-z "$foo") ]]`, `[[ -z $foo ]]`},
	{`[[ "a b" > "$c" ]]`, `[[ "a b" > $c ]]`},
	{`[[ ! -n $foo ]]`, `[[ -z $foo ]]`},
	{`[[ ! ! -e a && ! -z $b ]]`, `[[ -e a && -n $b ]]`},
	{`[[ (! a == b) || (! c != d) ]]`, `[[ (a != b) || (c == d) ]]`},
	noSimple(`[[ -n a$b && -n $c ]]`),
	noSimple(`[[ ! -e foo ]]`),
	noSimple(`[[ foo == bar ]]`),
	{`[[ foo = bar ]]`, `[[ foo == bar ]]`},

// stmts
	{"$( (sts))", "$(sts)"},
	{"( ( (sts)))", "(sts)"},
	noSimple("( (sts) >f)"),
	noSimple("(\n\tx\n\t(sts)\n)"),

// strings
	noSimple(`"foo"`),
	noSimple(`"foo$bar"`),
	noSimple(`"$bar"`),
	noSimple(`"f'o\\o"`),
	noSimple(`"fo\'o"`),
	noSimple(`"fo\\'o"`),
	noSimple(`"fo\no"`),
	{`"fo\$o"`, `'fo$o'`},
	{`"fo\"o"`, `'fo"o'`},
	{"\"fo\\`o\"", "'fo`o'"},
	noSimple(`fo"o"bar`),
	noSimple(`foo""bar`),
}

func TestSimplify(t *testing.T) {
	t.Parallel()
	parser := NewParser()
	printer := NewPrinter()
	for i, tc := range simplifyTests {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			prog, err := parser.Parse(strings.NewReader(tc.in), "")
			if err != nil {
				t.Fatal(err)
			}
			simplified := Simplify(prog)
			var buf bytes.Buffer
			printer.Print(&buf, prog)
			want := tc.want + "\n"
			if got := buf.String(); got != want {
				t.Fatalf("Simplify mismatch of %q\nwant: %q\ngot:  %q",
					tc.in, want, got)
			}
			if simplified && tc.in == tc.want {
				t.Fatalf("returned true but did not simplify")
			} else if !simplified && tc.in != tc.want {
				t.Fatalf("returned false but did simplify")
			}
		})
	}
}
07070100000064000081A4000003E800000064000000016046124D00000F14000000000000000000000000000000000000002000000000sh-3.2.4/syntax/token_string.go// Code generated by "stringer -type token -linecomment -trimprefix _"; DO NOT EDIT.

package syntax

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[illegalTok-0]
	_ = x[_EOF-1]
	_ = x[_Newl-2]
	_ = x[_Lit-3]
	_ = x[_LitWord-4]
	_ = x[_LitRedir-5]
	_ = x[sglQuote-6]
	_ = x[dblQuote-7]
	_ = x[bckQuote-8]
	_ = x[and-9]
	_ = x[andAnd-10]
	_ = x[orOr-11]
	_ = x[or-12]
	_ = x[orAnd-13]
	_ = x[dollar-14]
	_ = x[dollSglQuote-15]
	_ = x[dollDblQuote-16]
	_ = x[dollBrace-17]
	_ = x[dollBrack-18]
	_ = x[dollParen-19]
	_ = x[dollDblParen-20]
	_ = x[leftBrack-21]
	_ = x[dblLeftBrack-22]
	_ = x[leftParen-23]
	_ = x[dblLeftParen-24]
	_ = x[rightBrace-25]
	_ = x[rightBrack-26]
	_ = x[rightParen-27]
	_ = x[dblRightParen-28]
	_ = x[semicolon-29]
	_ = x[dblSemicolon-30]
	_ = x[semiAnd-31]
	_ = x[dblSemiAnd-32]
	_ = x[semiOr-33]
	_ = x[exclMark-34]
	_ = x[tilde-35]
	_ = x[addAdd-36]
	_ = x[subSub-37]
	_ = x[star-38]
	_ = x[power-39]
	_ = x[equal-40]
	_ = x[nequal-41]
	_ = x[lequal-42]
	_ = x[gequal-43]
	_ = x[addAssgn-44]
	_ = x[subAssgn-45]
	_ = x[mulAssgn-46]
	_ = x[quoAssgn-47]
	_ = x[remAssgn-48]
	_ = x[andAssgn-49]
	_ = x[orAssgn-50]
	_ = x[xorAssgn-51]
	_ = x[shlAssgn-52]
	_ = x[shrAssgn-53]
	_ = x[rdrOut-54]
	_ = x[appOut-55]
	_ = x[rdrIn-56]
	_ = x[rdrInOut-57]
	_ = x[dplIn-58]
	_ = x[dplOut-59]
	_ = x[clbOut-60]
	_ = x[hdoc-61]
	_ = x[dashHdoc-62]
	_ = x[wordHdoc-63]
	_ = x[rdrAll-64]
	_ = x[appAll-65]
	_ = x[cmdIn-66]
	_ = x[cmdOut-67]
	_ = x[plus-68]
	_ = x[colPlus-69]
	_ = x[minus-70]
	_ = x[colMinus-71]
	_ = x[quest-72]
	_ = x[colQuest-73]
	_ = x[assgn-74]
	_ = x[colAssgn-75]
	_ = x[perc-76]
	_ = x[dblPerc-77]
	_ = x[hash-78]
	_ = x[dblHash-79]
	_ = x[caret-80]
	_ = x[dblCaret-81]
	_ = x[comma-82]
	_ = x[dblComma-83]
	_ = x[at-84]
	_ = x[slash-85]
	_ = x[dblSlash-86]
	_ = x[colon-87]
	_ = x[tsExists-88]
	_ = x[tsRegFile-89]
	_ = x[tsDirect-90]
	_ = x[tsCharSp-91]
	_ = x[tsBlckSp-92]
	_ = x[tsNmPipe-93]
	_ = x[tsSocket-94]
	_ = x[tsSmbLink-95]
	_ = x[tsSticky-96]
	_ = x[tsGIDSet-97]
	_ = x[tsUIDSet-98]
	_ = x[tsGrpOwn-99]
	_ = x[tsUsrOwn-100]
	_ = x[tsModif-101]
	_ = x[tsRead-102]
	_ = x[tsWrite-103]
	_ = x[tsExec-104]
	_ = x[tsNoEmpty-105]
	_ = x[tsFdTerm-106]
	_ = x[tsEmpStr-107]
	_ = x[tsNempStr-108]
	_ = x[tsOptSet-109]
	_ = x[tsVarSet-110]
	_ = x[tsRefVar-111]
	_ = x[tsReMatch-112]
	_ = x[tsNewer-113]
	_ = x[tsOlder-114]
	_ = x[tsDevIno-115]
	_ = x[tsEql-116]
	_ = x[tsNeq-117]
	_ = x[tsLeq-118]
	_ = x[tsGeq-119]
	_ = x[tsLss-120]
	_ = x[tsGtr-121]
	_ = x[globQuest-122]
	_ = x[globStar-123]
	_ = x[globPlus-124]
	_ = x[globAt-125]
	_ = x[globExcl-126]
}

const _token_name = "illegalTokEOFNewlLitLitWordLitRedir'\"`&&&||||&$$'$\"${$[$($(([[[(((}])));;;;&;;&;|!~++--***==!=<=>=+=-=*=/=%=&=|=^=<<=>>=>>><<><&>&>|<<<<-<<<&>&>><(>(+:+-:-?:?=:=%%%###^^^,,,@///:-e-f-d-c-b-p-S-L-k-g-u-G-O-N-r-w-x-s-t-z-n-o-v-R=~-nt-ot-ef-eq-ne-le-ge-lt-gt?(*(+(@(!("

var _token_index = [...]uint16{0, 10, 13, 17, 20, 27, 35, 36, 37, 38, 39, 41, 43, 44, 46, 47, 49, 51, 53, 55, 57, 60, 61, 63, 64, 66, 67, 68, 69, 71, 72, 74, 76, 79, 81, 82, 83, 85, 87, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 117, 120, 121, 123, 124, 126, 128, 130, 132, 134, 137, 140, 142, 145, 147, 149, 150, 152, 153, 155, 156, 158, 159, 161, 162, 164, 165, 167, 168, 170, 171, 173, 174, 175, 177, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 231, 234, 237, 240, 243, 246, 249, 252, 255, 257, 259, 261, 263, 265}

func (i token) String() string {
	if i >= token(len(_token_index)-1) {
		return "token(" + strconv.FormatInt(int64(i), 10) + ")"
	}
	return _token_name[_token_index[i]:_token_index[i+1]]
}
07070100000065000081A4000003E800000064000000016046124D0000265D000000000000000000000000000000000000001A00000000sh-3.2.4/syntax/tokens.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

//go:generate stringer -type token -linecomment -trimprefix _

type token uint32

// The list of all possible tokens.
const (
	illegalTok token = iota

_EOF
	_Newl
	_Lit
	_LitWord
	_LitRedir

sglQuote // '
	dblQuote // "
	bckQuote // `

and    // &
	andAnd // &&
	orOr   // ||
	or     // |
	orAnd  // |&

dollar       // $
	dollSglQuote // $'
	dollDblQuote // $"
	dollBrace    // ${
	dollBrack    // $[
	dollParen    // $(
	dollDblParen // $((
	leftBrack    // [
	dblLeftBrack // [[
	leftParen    // (
	dblLeftParen // ((

rightBrace    // }
	rightBrack    // ]
	rightParen    // )
	dblRightParen // ))
	semicolon     // ;

dblSemicolon // ;;
	semiAnd      // ;&
	dblSemiAnd   // ;;&
	semiOr       // ;|

exclMark // !
	tilde    // ~
	addAdd   // ++
	subSub   // --
	star     // *
	power    // **
	equal    // ==
	nequal   // !=
	lequal   // <=
	gequal   // >=

addAssgn // +=
	subAssgn // -=
	mulAssgn // *=
	quoAssgn // /=
	remAssgn // %=
	andAssgn // &=
	orAssgn  // |=
	xorAssgn // ^=
	shlAssgn // <<=
	shrAssgn // >>=

rdrOut   // >
	appOut   // >>
	rdrIn    // <
	rdrInOut // <>
	dplIn    // <&
	dplOut   // >&
	clbOut   // >|
	hdoc     // <<
	dashHdoc // <<-
	wordHdoc // <<<
	rdrAll   // &>
	appAll   // &>>

cmdIn  // <(
	cmdOut // >(

plus     // +
	colPlus  // :+
	minus    // -
	colMinus // :-
	quest    // ?
	colQuest // :?
	assgn    // =
	colAssgn // :=
	perc     // %
	dblPerc  // %%
	hash     // #
	dblHash  // ##
	caret    // ^
	dblCaret // ^^
	comma    // ,
	dblComma // ,,
	at       // @
	slash    // /
	dblSlash // //
	colon    // :

tsExists  // -e
	tsRegFile // -f
	tsDirect  // -d
	tsCharSp  // -c
	tsBlckSp  // -b
	tsNmPipe  // -p
	tsSocket  // -S
	tsSmbLink // -L
	tsSticky  // -k
	tsGIDSet  // -g
	tsUIDSet  // -u
	tsGrpOwn  // -G
	tsUsrOwn  // -O
	tsModif   // -N
	tsRead    // -r
	tsWrite   // -w
	tsExec    // -x
	tsNoEmpty // -s
	tsFdTerm  // -t
	tsEmpStr  // -z
	tsNempStr // -n
	tsOptSet  // -o
	tsVarSet  // -v
	tsRefVar  // -R

tsReMatch // =~
	tsNewer   // -nt
	tsOlder   // -ot
	tsDevIno  // -ef
	tsEql     // -eq
	tsNeq     // -ne
	tsLeq     // -le
	tsGeq     // -ge
	tsLss     // -lt
	tsGtr     // -gt

globQuest // ?(
	globStar  // *(
	globPlus  // +(
	globAt    // @(
	globExcl  // !(
)

type RedirOperator token

const (
	RdrOut   = RedirOperator(rdrOut) + iota // >
	AppOut                                  // >>
	RdrIn                                   // <
	RdrInOut                                // <>
	DplIn                                   // <&
	DplOut                                  // >&
	ClbOut                                  // >|
	Hdoc                                    // <<
	DashHdoc                                // <<-
	WordHdoc                                // <<<
	RdrAll                                  // &>
	AppAll                                  // &>>
)

type ProcOperator token

const (
	CmdIn  = ProcOperator(cmdIn) + iota // <(
	CmdOut                              // >(
)

type GlobOperator token

const (
	GlobZeroOrOne  = GlobOperator(globQuest) + iota // ?(
	GlobZeroOrMore                                  // *(
	GlobOneOrMore                                   // +(
	GlobOne                                         // @(
	GlobExcept                                      // !(
)

type BinCmdOperator token

const (
	AndStmt = BinCmdOperator(andAnd) + iota // &&
	OrStmt                                  // ||
	Pipe                                    // |
	PipeAll                                 // |&
)

type CaseOperator token

const (
	Break       = CaseOperator(dblSemicolon) + iota // ;;
	Fallthrough                                     // ;&
	Resume                                          // ;;&
	ResumeKorn                                      // ;|
)

type ParNamesOperator token

const (
	NamesPrefix      = ParNamesOperator(star) // *
	NamesPrefixWords = ParNamesOperator(at)   // @
)

type ParExpOperator token

const (
	AlternateUnset       = ParExpOperator(plus) + iota // +
	AlternateUnsetOrNull                               // :+
	DefaultUnset                                       // -
	DefaultUnsetOrNull                                 // :-
	ErrorUnset                                         // ?
	ErrorUnsetOrNull                                   // :?
	AssignUnset                                        // =
	AssignUnsetOrNull                                  // :=
	RemSmallSuffix                                     // %
	RemLargeSuffix                                     // %%
	RemSmallPrefix                                     // #
	RemLargePrefix                                     // ##
	UpperFirst                                         // ^
	UpperAll                                           // ^^
	LowerFirst                                         // ,
	LowerAll                                           // ,,
	OtherParamOps                                      // @
)

type UnAritOperator token

const (
	Not         = UnAritOperator(exclMark) + iota // !
	BitNegation                                   // ~
	Inc                                           // ++
	Dec                                           // --
	Plus        = UnAritOperator(plus)            // +
	Minus       = UnAritOperator(minus)           // -
)

type BinAritOperator token

const (
	Add = BinAritOperator(plus)   // +
	Sub = BinAritOperator(minus)  // -
	Mul = BinAritOperator(star)   // *
	Quo = BinAritOperator(slash)  // /
	Rem = BinAritOperator(perc)   // %
	Pow = BinAritOperator(power)  // **
	Eql = BinAritOperator(equal)  // ==
	Gtr = BinAritOperator(rdrOut) // >
	Lss = BinAritOperator(rdrIn)  // <
	Neq = BinAritOperator(nequal) // !=
	Leq = BinAritOperator(lequal) // <=
	Geq = BinAritOperator(gequal) // >=
	And = BinAritOperator(and)    // &
	Or  = BinAritOperator(or)     // |
	Xor = BinAritOperator(caret)  // ^
	Shr = BinAritOperator(appOut) // >>
	Shl = BinAritOperator(hdoc)   // <<

AndArit   = BinAritOperator(andAnd) // &&
	OrArit    = BinAritOperator(orOr)   // ||
	Comma     = BinAritOperator(comma)  // ,
	TernQuest = BinAritOperator(quest)  // ?
	TernColon = BinAritOperator(colon)  // :

Assgn    = BinAritOperator(assgn)    // =
	AddAssgn = BinAritOperator(addAssgn) // +=
	SubAssgn = BinAritOperator(subAssgn) // -=
	MulAssgn = BinAritOperator(mulAssgn) // *=
	QuoAssgn = BinAritOperator(quoAssgn) // /=
	RemAssgn = BinAritOperator(remAssgn) // %=
	AndAssgn = BinAritOperator(andAssgn) // &=
	OrAssgn  = BinAritOperator(orAssgn)  // |=
	XorAssgn = BinAritOperator(xorAssgn) // ^=
	ShlAssgn = BinAritOperator(shlAssgn) // <<=
	ShrAssgn = BinAritOperator(shrAssgn) // >>=
)

type UnTestOperator token

const (
	TsExists  = UnTestOperator(tsExists) + iota // -e
	TsRegFile                                   // -f
	TsDirect                                    // -d
	TsCharSp                                    // -c
	TsBlckSp                                    // -b
	TsNmPipe                                    // -p
	TsSocket                                    // -S
	TsSmbLink                                   // -L
	TsSticky                                    // -k
	TsGIDSet                                    // -g
	TsUIDSet                                    // -u
	TsGrpOwn                                    // -G
	TsUsrOwn                                    // -O
	TsModif                                     // -N
	TsRead                                      // -r
	TsWrite                                     // -w
	TsExec                                      // -x
	TsNoEmpty                                   // -s
	TsFdTerm                                    // -t
	TsEmpStr                                    // -z
	TsNempStr                                   // -n
	TsOptSet                                    // -o
	TsVarSet                                    // -v
	TsRefVar                                    // -R
	TsNot     = UnTestOperator(exclMark)        // !
)

type BinTestOperator token

const (
	TsReMatch    = BinTestOperator(tsReMatch) + iota // =~
	TsNewer                                          // -nt
	TsOlder                                          // -ot
	TsDevIno                                         // -ef
	TsEql                                            // -eq
	TsNeq                                            // -ne
	TsLeq                                            // -le
	TsGeq                                            // -ge
	TsLss                                            // -lt
	TsGtr                                            // -gt
	AndTest      = BinTestOperator(andAnd)           // &&
	OrTest       = BinTestOperator(orOr)             // ||
	TsMatchShort = BinTestOperator(assgn)            // =
	TsMatch      = BinTestOperator(equal)            // ==
	TsNoMatch    = BinTestOperator(nequal)           // !=
	TsBefore     = BinTestOperator(rdrIn)            // <
	TsAfter      = BinTestOperator(rdrOut)           // >
)

func (o RedirOperator) String() string    { return token(o).String() }
func (o ProcOperator) String() string     { return token(o).String() }
func (o GlobOperator) String() string     { return token(o).String() }
func (o BinCmdOperator) String() string   { return token(o).String() }
func (o CaseOperator) String() string     { return token(o).String() }
func (o ParNamesOperator) String() string { return token(o).String() }
func (o ParExpOperator) String() string   { return token(o).String() }
func (o UnAritOperator) String() string   { return token(o).String() }
func (o BinAritOperator) String() string  { return token(o).String() }
func (o UnTestOperator) String() string   { return token(o).String() }
func (o BinTestOperator) String() string  { return token(o).String() }
07070100000066000081A4000003E800000064000000016046124D00001657000000000000000000000000000000000000001800000000sh-3.2.4/syntax/walk.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"fmt"
	"io"
	"reflect"
)

func walkStmts(stmts []*Stmt, last []Comment, f func(Node) bool) {
	for _, s := range stmts {
		Walk(s, f)
	}
	for _, c := range last {
		Walk(&c, f)
	}
}

func walkWords(words []*Word, f func(Node) bool) {
	for _, w := range words {
		Walk(w, f)
	}
}

// Walk traverses a syntax tree in depth-first order: It starts by calling
// f(node); node must not be nil. If f returns true, Walk invokes f
// recursively for each of the non-nil children of node, followed by
// f(nil).
func Walk(node Node, f func(Node) bool) {
	if !f(node) {
		return
	}

switch x := node.(type) {
	case *File:
		walkStmts(x.Stmts, x.Last, f)
	case *Comment:
	case *Stmt:
		for _, c := range x.Comments {
			if !x.End().After(c.Pos()) {
				defer Walk(&c, f)
				break
			}
			Walk(&c, f)
		}
		if x.Cmd != nil {
			Walk(x.Cmd, f)
		}
		for _, r := range x.Redirs {
			Walk(r, f)
		}
	case *Assign:
		if x.Name != nil {
			Walk(x.Name, f)
		}
		if x.Value != nil {
			Walk(x.Value, f)
		}
		if x.Index != nil {
			Walk(x.Index, f)
		}
		if x.Array != nil {
			Walk(x.Array, f)
		}
	case *Redirect:
		if x.N != nil {
			Walk(x.N, f)
		}
		Walk(x.Word, f)
		if x.Hdoc != nil {
			Walk(x.Hdoc, f)
		}
	case *CallExpr:
		for _, a := range x.Assigns {
			Walk(a, f)
		}
		walkWords(x.Args, f)
	case *Subshell:
		walkStmts(x.Stmts, x.Last, f)
	case *Block:
		walkStmts(x.Stmts, x.Last, f)
	case *IfClause:
		walkStmts(x.Cond, x.CondLast, f)
		walkStmts(x.Then, x.ThenLast, f)
		if x.Else != nil {
			Walk(x.Else, f)
		}
	case *WhileClause:
		walkStmts(x.Cond, x.CondLast, f)
		walkStmts(x.Do, x.DoLast, f)
	case *ForClause:
		Walk(x.Loop, f)
		walkStmts(x.Do, x.DoLast, f)
	case *WordIter:
		Walk(x.Name, f)
		walkWords(x.Items, f)
	case *CStyleLoop:
		if x.Init != nil {
			Walk(x.Init, f)
		}
		if x.Cond != nil {
			Walk(x.Cond, f)
		}
		if x.Post != nil {
			Walk(x.Post, f)
		}
	case *BinaryCmd:
		Walk(x.X, f)
		Walk(x.Y, f)
	case *FuncDecl:
		Walk(x.Name, f)
		Walk(x.Body, f)
	case *Word:
		for _, wp := range x.Parts {
			Walk(wp, f)
		}
	case *Lit:
	case *SglQuoted:
	case *DblQuoted:
		for _, wp := range x.Parts {
			Walk(wp, f)
		}
	case *CmdSubst:
		walkStmts(x.Stmts, x.Last, f)
	case *ParamExp:
		Walk(x.Param, f)
		if x.Index != nil {
			Walk(x.Index, f)
		}
		if x.Repl != nil {
			if x.Repl.Orig != nil {
				Walk(x.Repl.Orig, f)
			}
			if x.Repl.With != nil {
				Walk(x.Repl.With, f)
			}
		}
		if x.Exp != nil && x.Exp.Word != nil {
			Walk(x.Exp.Word, f)
		}
	case *ArithmExp:
		Walk(x.X, f)
	case *ArithmCmd:
		Walk(x.X, f)
	case *BinaryArithm:
		Walk(x.X, f)
		Walk(x.Y, f)
	case *BinaryTest:
		Walk(x.X, f)
		Walk(x.Y, f)
	case *UnaryArithm:
		Walk(x.X, f)
	case *UnaryTest:
		Walk(x.X, f)
	case *ParenArithm:
		Walk(x.X, f)
	case *ParenTest:
		Walk(x.X, f)
	case *CaseClause:
		Walk(x.Word, f)
		for _, ci := range x.Items {
			Walk(ci, f)
		}
		for _, c := range x.Last {
			Walk(&c, f)
		}
	case *CaseItem:
		for _, c := range x.Comments {
			if c.Pos().After(x.Pos()) {
				defer Walk(&c, f)
				break
			}
			Walk(&c, f)
		}
		walkWords(x.Patterns, f)
		walkStmts(x.Stmts, x.Last, f)
	case *TestClause:
		Walk(x.X, f)
	case *DeclClause:
		for _, a := range x.Args {
			Walk(a, f)
		}
	case *ArrayExpr:
		for _, el := range x.Elems {
			Walk(el, f)
		}
		for _, c := range x.Last {
			Walk(&c, f)
		}
	case *ArrayElem:
		for _, c := range x.Comments {
			if c.Pos().After(x.Pos()) {
				defer Walk(&c, f)
				break
			}
			Walk(&c, f)
		}
		if x.Index != nil {
			Walk(x.Index, f)
		}
		if x.Value != nil {
			Walk(x.Value, f)
		}
	case *ExtGlob:
		Walk(x.Pattern, f)
	case *ProcSubst:
		walkStmts(x.Stmts, x.Last, f)
	case *TimeClause:
		if x.Stmt != nil {
			Walk(x.Stmt, f)
		}
	case *CoprocClause:
		if x.Name != nil {
			Walk(x.Name, f)
		}
		Walk(x.Stmt, f)
	case *LetClause:
		for _, expr := range x.Exprs {
			Walk(expr, f)
		}
	case *TestDecl:
		Walk(x.Description, f)
		Walk(x.Body, f)
	default:
		panic(fmt.Sprintf("syntax.Walk: unexpected node type %T", x))
	}

f(nil)
}

// DebugPrint prints the provided syntax tree, spanning multiple lines and with
// indentation. Can be useful to investigate the content of a syntax tree.
func DebugPrint(w io.Writer, node Node) error {
	p := debugPrinter{out: w}
	p.print(reflect.ValueOf(node))
	return p.err
}

type debugPrinter struct {
	out   io.Writer
	level int
	err   error
}

func (p *debugPrinter) printf(format string, args ...interface{}) {
	_, err := fmt.Fprintf(p.out, format, args...)
	if err != nil && p.err == nil {
		p.err = err
	}
}

func (p *debugPrinter) newline() {
	p.printf("\n")
	for i := 0; i < p.level; i++ {
		p.printf(".  ")
	}
}

func (p *debugPrinter) print(x reflect.Value) {
	switch x.Kind() {
	case reflect.Interface:
		if x.IsNil() {
			p.printf("nil")
			return
		}
		p.print(x.Elem())
	case reflect.Ptr:
		if x.IsNil() {
			p.printf("nil")
			return
		}
		p.printf("*")
		p.print(x.Elem())
	case reflect.Slice:
		p.printf("%s (len = %d) {", x.Type(), x.Len())
		if x.Len() > 0 {
			p.level++
			p.newline()
			for i := 0; i < x.Len(); i++ {
				p.printf("%d: ", i)
				p.print(x.Index(i))
				if i == x.Len()-1 {
					p.level--
				}
				p.newline()
			}
		}
		p.printf("}")

case reflect.Struct:
		if v, ok := x.Interface().(Pos); ok {
			p.printf("%v:%v", v.Line(), v.Col())
			return
		}
		t := x.Type()
		p.printf("%s {", t)
		p.level++
		p.newline()
		for i := 0; i < t.NumField(); i++ {
			p.printf("%s: ", t.Field(i).Name)
			p.print(x.Field(i))
			if i == x.NumField()-1 {
				p.level--
			}
			p.newline()
		}
		p.printf("}")
	default:
		p.printf("%#v", x.Interface())
	}
}
07070100000067000081A4000003E800000064000000016046124D00000BAF000000000000000000000000000000000000001D00000000sh-3.2.4/syntax/walk_test.go// Copyright (c) 2016, Daniel Martí <mvdan@mvdan.cc>
// See LICENSE for licensing information

package syntax

import (
	"fmt"
	"reflect"
	"strings"
	"testing"
)

func TestWalk(t *testing.T) {
	t.Parallel()
	seen := map[string]bool{
		"*syntax.File":         false,
		"*syntax.Comment":      false,
		"*syntax.Stmt":         false,
		"*syntax.Assign":       false,
		"*syntax.Redirect":     false,
		"*syntax.CallExpr":     false,
		"*syntax.Subshell":     false,
		"*syntax.Block":        false,
		"*syntax.IfClause":     false,
		"*syntax.WhileClause":  false,
		"*syntax.ForClause":    false,
		"*syntax.WordIter":     false,
		"*syntax.CStyleLoop":   false,
		"*syntax.BinaryCmd":    false,
		"*syntax.FuncDecl":     false,
		"*syntax.Word":         false,
		"*syntax.Lit":          false,
		"*syntax.SglQuoted":    false,
		"*syntax.DblQuoted":    false,
		"*syntax.CmdSubst":     false,
		"*syntax.ParamExp":     false,
		"*syntax.ArithmExp":    false,
		"*syntax.ArithmCmd":    false,
		"*syntax.BinaryArithm": false,
		"*syntax.UnaryArithm":  false,
		"*syntax.ParenArithm":  false,
		"*syntax.CaseClause":   false,
		"*syntax.CaseItem":     false,
		"*syntax.TestClause":   false,
		"*syntax.BinaryTest":   false,
		"*syntax.UnaryTest":    false,
		"*syntax.ParenTest":    false,
		"*syntax.DeclClause":   false,
		"*syntax.ArrayExpr":    false,
		"*syntax.ArrayElem":    false,
		"*syntax.ExtGlob":      false,
		"*syntax.ProcSubst":    false,
		"*syntax.TimeClause":   false,
		"*syntax.CoprocClause": false,
		"*syntax.LetClause":    false,
	}
	parser := NewParser(KeepComments(true))
	var allStrs []string
	for _, c := range fileTests {
		allStrs = append(allStrs, c.Strs[0])
	}
	for _, c := range printTests {
		allStrs = append(allStrs, c.in)
	}
	for i, in := range allStrs {
		t.Run(fmt.Sprintf("%03d", i), func(t *testing.T) {
			prog, err := parser.Parse(strings.NewReader(in), "")
			if err != nil {
				// good enough for now, as the bash
				// parser ignoring errors covers what we
				// need.
				return
			}
			lastOffs := uint(0)
			Walk(prog, func(node Node) bool {
				if node == nil {
					return false
				}
				tstr := reflect.TypeOf(node).String()
				if _, ok := seen[tstr]; !ok {
					t.Errorf("unexpected type: %s", tstr)
				} else {
					seen[tstr] = true
				}
				switch node.(type) {
				case *Lit:
					return false
				case *Comment:
				default:
					return true
				}
				offs := node.Pos().Offset()
				if offs >= lastOffs {
					lastOffs = offs
				} else {
					t.Errorf("comment offset goes back")
				}
				return true
			})
		})
	}
	for tstr, tseen := range seen {
		if !tseen {
			t.Errorf("type not seen: %s", tstr)
		}
	}
}

type newNode struct{}

func (newNode) Pos() Pos { return Pos{} }
func (newNode) End() Pos { return Pos{} }

func TestWalkUnexpectedType(t *testing.T) {
	t.Parallel()
	defer func() {
		if r := recover(); r == nil {
			t.Errorf("did not panic")
		}
	}()
	Walk(newNode{}, func(node Node) bool {
		return true
	})
}
07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!1386 blocks

Places

File sh-3.2.4.obscpio of Package shfmt (Revision caebc2cdca2b91a8e45cd24455322f24)

Places