sh/syntax/example_test.go at bashsupport-pro · BashSupport-Pro/sh · GitHub

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// 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/zsh feature; tried parsing as posix

// for ((i = 0; i < 5; i++)); do echo $i >f; done

// for ((i = 0; i < 5; i++)); do echo $i > f; done

}

// Keep in sync with FuzzQuote.

func ExampleQuote() {

for _, s := range []string{

"foo",

"bar $baz",

`"won't"`,

"~/home",

"#1304",

"name=value",

"for",

"glob-*",

"invalid-\xe2'",

"nonprint-\x0b\x1b",

} {

// We assume Bash syntax here.

// For general shell syntax quoting, use syntax.LangPOSIX.

quoted, err := syntax.Quote(s, syntax.LangBash)

if err != nil {

fmt.Printf("%q cannot be quoted: %v\n", s, err)

} else {

fmt.Printf("Quote(%17q): %s\n", s, quoted)

}

// Output:

// Quote( "foo"): foo

// Quote( "bar $baz"): 'bar $baz'

// Quote( "\"won't\""): "\"won't\""

// Quote( "~/home"): '~/home'

// Quote( "#1304"): '#1304'

// Quote( "name=value"): 'name=value'

// Quote( "for"): 'for'

// Quote( "glob-*"): 'glob-*'

// Quote( "invalid-\xe2'"): $'invalid-\xe2\''

// Quote("nonprint-\v\x1b"): $'nonprint-\v\x1b'

}

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 node := node.(type) {

case *syntax.ParamExp:

node.Param.Value = strings.ToUpper(node.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

// . . . Disown: false

// . . . Redirs: []*syntax.Redirect (len = 0) {}

// . . }

// . }

// . Last: []syntax.Comment (len = 0) {}

// }

}

sh/syntax/example_test.go at bashsupport-pro · BashSupport-Pro/sh · GitHub

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