sh/syntax/parser_test.go at master · ivodvb/sh · GitHub

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// 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()

// Consider using a custom reader to save memory.

tests := []struct {

name, in, want string

}{

{

"LineOverflowIsValid",

strings.Repeat("\n", lineMax) + "foo; bar",

"<nil>",

{

"LineOverflowPosString",

strings.Repeat("\n", lineMax) + ")",

"?:1: ) can only be used to close a subshell",

{

"LineOverflowExtraPosString",

strings.Repeat("\n", lineMax+5) + ")",

"?:1: ) can only be used to close a subshell",

{

"ColOverflowPosString",

strings.Repeat(" ", colMax) + ")",

"1:?: ) can only be used to close a subshell",

{

"ColOverflowExtraPosString",

strings.Repeat(" ", colMax) + ")",

"1:?: ) can only be used to close a subshell",

{

"ColOverflowSkippedPosString",

strings.Repeat(" ", colMax+5) + "\n)",

"2:1: ) can only be used to close a subshell",

{

"LargestLineNumber",

strings.Repeat("\n", lineMax-1) + ")",

"262143:1: ) can only be used to close a subshell",

{

"LargestColNumber",

strings.Repeat(" ", colMax-1) + ")",

"1:16383: ) 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 (

hasBash51 bool

hasDash059 bool

hasMksh59 bool

)

func TestMain(m *testing.M) {

os.Setenv("LANGUAGE", "en_US.UTF8")

os.Setenv("LC_ALL", "en_US.UTF8")

hasBash51 = cmdContains("version 5.1", "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 ${#<}")

hasMksh59 = cmdContains(" R59 ", "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 %q of %q, found none", strings.Join(cmd.Args, " "), in)

} else if !wantErr && err != nil {

t.Fatalf("Unexpected error in %q of %q: %v", strings.Join(cmd.Args, " "), in, err)

}

func TestParseBashConfirm(t *testing.T) {

if testing.Short() {

t.Skip("calling bash is slow.")

}

if !hasBash51 {

t.Skip("bash 5.1 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 !hasMksh59 {

t.Skip("mksh 59 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 !hasBash51 {

t.Skip("bash 5.1 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 !hasMksh59 {

t.Skip("mksh 59 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{}

}

var shellTests = []errorCase{

{

in: "echo \x80",

common: `1:6: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "\necho \x80",

common: `2:6: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "echo foo\x80bar",

common: `1:9: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "echo foo\xc3",

common: `1:9: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "#foo\xc3",

common: `1:5: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "echo a\x80",

common: `1:7: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "<<$\xc8\n$\xc8",

common: `1:4: invalid UTF-8 encoding #NOERR common shells use bytes`,

{

in: "echo $((foo\x80bar",

common: `1:12: invalid UTF-8 encoding`,

{

in: "z=($\\\n#\\\n\\\n$#\x91\\\n",

bash: `4:3: invalid UTF-8 encoding`,

{

in: `((# 1 + 2))`,

bash: `1:1: unsigned expressions are a mksh feature`,

{

in: `$((# 1 + 2))`,

posix: `1:1: unsigned expressions are a mksh feature`,

bash: `1:1: unsigned expressions are a mksh feature`,

{

in: `${ foo;}`,

posix: `1:1: "${ stmts;}" is a mksh feature`,

bash: `1:1: "${ stmts;}" is a mksh feature`,

{

in: `${ `,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: `${ foo;`,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: `${ foo }`,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: `${|foo;}`,

posix: `1:1: "${|stmts;}" is a mksh feature`,

bash: `1:1: "${|stmts;}" is a mksh feature`,

{

in: `${|`,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: `${|foo;`,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: `${|foo }`,

mksh: `1:1: reached EOF without matching ${ with }`,

{

in: "((foo\x80bar",

common: `1:6: invalid UTF-8 encoding`,

{

in: ";\x80",

common: `1:2: invalid UTF-8 encoding`,

{

in: "${a\x80",

common: `1:4: invalid UTF-8 encoding`,

{

in: "${a#\x80",

common: `1:5: invalid UTF-8 encoding`,

{

in: "${a-'\x80",

common: `1:6: invalid UTF-8 encoding`,

{

in: "echo $((a |\x80",

common: `1:12: invalid UTF-8 encoding`,

{

in: "!",

common: `1:1: "!" cannot form a statement alone`,

{

// bash allows lone '!', unlike dash, mksh, and us.

in: "! !",

common: `1:1: cannot negate a command multiple times`,

bash: `1:1: cannot negate a command multiple times #NOERR`,

{

in: "! ! foo",

common: `1:1: cannot negate a command multiple times #NOERR`,

posix: `1:1: cannot negate a command multiple times`,

{

in: "}",

common: `1:1: "}" can only be used to close a block`,

{

in: "then",

common: `1:1: "then" can only be used in an if`,

{

in: "elif",

common: `1:1: "elif" can only be used in an if`,

{

in: "fi",

common: `1:1: "fi" can only be used to end an if`,

{

in: "do",

common: `1:1: "do" can only be used in a loop`,

{

in: "done",

common: `1:1: "done" can only be used to end a loop`,

{

in: "esac",

common: `1:1: "esac" can only be used to end a case`,

{

in: "a=b { foo; }",

common: `1:12: "}" can only be used to close a block`,

{

in: "a=b foo() { bar; }",

common: `1:8: a command can only contain words and redirects; encountered (`,

{

in: "a=b if foo; then bar; fi",

common: `1:13: "then" can only be used in an if`,

{

in: ">f { foo; }",

common: `1:11: "}" can only be used to close a block`,

{

in: ">f foo() { bar; }",

common: `1:7: a command can only contain words and redirects; encountered (`,

{

in: ">f if foo; then bar; fi",

common: `1:12: "then" can only be used in an if`,

{

in: "if done; then b; fi",

common: `1:4: "done" can only be used to end a loop`,

{

in: "'",

common: `1:1: reached EOF without closing quote '`,

{

in: `"`,

common: `1:1: reached EOF without closing quote "`,

{

in: `'\''`,

common: `1:4: reached EOF without closing quote '`,

{

in: ";",

common: `1:1: ; can only immediately follow a statement`,

{

in: "{ ; }",

common: `1:3: ; can only immediately follow a statement`,

{

in: `"foo"(){ :; }`,

common: `1:1: invalid func name`,

mksh: `1:1: invalid func name #NOERR`,

{

in: `foo$bar(){ :; }`,

common: `1:1: invalid func name`,

{

in: "{",

common: `1:1: reached EOF without matching { with }`,

{

in: "{ #}",

common: `1:1: reached EOF without matching { with }`,

{

in: "(",

common: `1:1: reached EOF without matching ( with )`,

{

in: ")",

common: `1:1: ) can only be used to close a subshell`,

{

in: "`",

common: "1:1: reached EOF without closing quote `",

{

in: ";;",

common: `1:1: ;; can only be used in a case clause`,

{

in: "( foo;",

common: `1:1: reached EOF without matching ( with )`,

{

in: "&",

common: `1:1: & can only immediately follow a statement`,

{

in: "|",

common: `1:1: | can only immediately follow a statement`,

{

in: "&&",

common: `1:1: && can only immediately follow a statement`,

{

in: "||",

common: `1:1: || can only immediately follow a statement`,

{

in: "foo; || bar",

common: `1:6: || can only immediately follow a statement`,

{

in: "echo & || bar",

common: `1:8: || can only immediately follow a statement`,

{

in: "echo & ; bar",

common: `1:8: ; can only immediately follow a statement`,

{

in: "foo;;",

common: `1:4: ;; can only be used in a case clause`,

{

in: "foo(",

common: `1:1: "foo(" must be followed by )`,

{

in: "foo(bar",

common: `1:1: "foo(" must be followed by )`,

{

in: "à(",

common: `1:1: "foo(" must be followed by )`,

{

in: "foo'",

common: `1:4: reached EOF without closing quote '`,

{

in: `foo"`,

common: `1:4: reached EOF without closing quote "`,

{

in: `"foo`,

common: `1:1: reached EOF without closing quote "`,

{

in: `"foobar\`,

common: `1:1: reached EOF without closing quote "`,

{

in: `"foo\a`,

common: `1:1: reached EOF without closing quote "`,

{

in: "foo()",

common: `1:1: "foo()" must be followed by a statement`,

mksh: `1:1: "foo()" must be followed by a statement #NOERR`,

{

in: "foo() {",

common: `1:7: reached EOF without matching { with }`,

{

in: "foo-bar() { x; }",

posix: `1:1: invalid func name`,

{

in: "foò() { x; }",

posix: `1:1: invalid func name`,

{

in: "echo foo(",

common: `1:9: a command can only contain words and redirects; encountered (`,

{

in: "echo &&",

common: `1:6: && must be followed by a statement`,

{

in: "echo |",

common: `1:6: | must be followed by a statement`,

{

in: "echo ||",

common: `1:6: || must be followed by a statement`,

{

in: "echo | #bar",

common: `1:6: | must be followed by a statement`,

{

in: "echo && #bar",

common: `1:6: && must be followed by a statement`,

{

in: "`echo &&`",

common: `1:7: && must be followed by a statement`,

{

in: "`echo |`",

common: `1:7: | must be followed by a statement`,

{

in: "echo | ! bar",

common: `1:8: "!" can only be used in full statements`,

{

in: "echo >",

common: `1:6: > must be followed by a word`,

{

in: "echo >>",

common: `1:6: >> must be followed by a word`,

{

in: "echo <",

common: `1:6: < must be followed by a word`,

{

in: "echo 2>",

common: `1:7: > must be followed by a word`,

{

in: "echo <\nbar",

common: `1:6: < must be followed by a word`,

{

in: "echo | < #bar",

common: `1:8: < must be followed by a word`,

{

in: "echo && > #",

common: `1:9: > must be followed by a word`,

{

in: "<<",

common: `1:1: << must be followed by a word`,

{

in: "<<EOF",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<EOF\n\\",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<EOF\n\\\n",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<EOF\n\\\nEOF",

// Seems like mksh has a bug here.

common: `1:1: unclosed here-document 'EOF' #NOERR`,

{

in: "<<EOF\nfoo\\\nEOF",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<'EOF'\n\\\n",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<EOF <`\n#\n`\n``",

common: `1:1: unclosed here-document 'EOF'`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<'EOF'",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<\\EOF",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<\\\\EOF",

common: `1:1: unclosed here-document '\EOF' #NOERR`,

mksh: `1:1: unclosed here-document '\EOF'`,

{

in: "<<-EOF",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<-EOF\n\t",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<-'EOF'\n\t",

common: `1:1: unclosed here-document 'EOF' #NOERR`,

mksh: `1:1: unclosed here-document 'EOF'`,

{

in: "<<\nEOF\nbar\nEOF",

common: `1:1: << must be followed by a word`,

{

in: "if",

common: `1:1: "if" must be followed by a statement list`,

{

in: "if true;",

common: `1:1: "if <cond>" must be followed by "then"`,

{

in: "if true then",

common: `1:1: "if <cond>" must be followed by "then"`,

{

in: "if true; then bar;",

common: `1:1: if statement must end with "fi"`,

{

in: "if true; then bar; fi#etc",

common: `1:1: if statement must end with "fi"`,

{

in: "if a; then b; elif c;",

common: `1:15: "elif <cond>" must be followed by "then"`,

{

in: "'foo' '",

common: `1:7: reached EOF without closing quote '`,

{

in: "'foo\n' '",

common: `2:3: reached EOF without closing quote '`,

{

in: "while",

common: `1:1: "while" must be followed by a statement list`,

{

in: "while true;",

common: `1:1: "while <cond>" must be followed by "do"`,

{

in: "while true; do bar",

common: `1:1: while statement must end with "done"`,

{

in: "while true; do bar;",

common: `1:1: while statement must end with "done"`,

{

in: "until",

common: `1:1: "until" must be followed by a statement list`,

{

in: "until true;",

common: `1:1: "until <cond>" must be followed by "do"`,

{

in: "until true; do bar",

common: `1:1: until statement must end with "done"`,

{

in: "until true; do bar;",

common: `1:1: until statement must end with "done"`,

{

in: "for",

common: `1:1: "for" must be followed by a literal`,

{

in: "for i",

common: `1:1: "for foo" must be followed by "in", "do", ;, or a newline`,

{

in: "for i in;",

common: `1:1: "for foo [in words]" must be followed by "do"`,

{

in: "for i in 1 2 3;",

common: `1:1: "for foo [in words]" must be followed by "do"`,

{

in: "for i in 1 2 &",

common: `1:1: "for foo [in words]" must be followed by "do"`,

{

in: "for i in 1 2 (",

common: `1:14: word list can only contain words`,

{

in: "for i in 1 2 3; do echo $i;",

common: `1:1: for statement must end with "done"`,

{

in: "for i in 1 2 3; echo $i;",

common: `1:1: "for foo [in words]" must be followed by "do"`,

{

in: "for 'i' in 1 2 3; do echo $i; done",

common: `1:1: "for" must be followed by a literal`,

{

in: "for in 1 2 3; do echo $i; done",

common: `1:1: "for foo" must be followed by "in", "do", ;, or a newline`,

{

in: "select",

bsmk: `1:1: "select" must be followed by a literal`,

{

in: "select i",

bsmk: `1:1: "select foo" must be followed by "in", "do", ;, or a newline`,

{

in: "select i in;",

bsmk: `1:1: "select foo [in words]" must be followed by "do"`,

{

in: "select i in 1 2 3;",

bsmk: `1:1: "select foo [in words]" must be followed by "do"`,

{

in: "select i in 1 2 3; do echo $i;",

bsmk: `1:1: select statement must end with "done"`,

{

in: "select i in 1 2 3; echo $i;",

bsmk: `1:1: "select foo [in words]" must be followed by "do"`,

{

in: "select 'i' in 1 2 3; do echo $i; done",

bsmk: `1:1: "select" must be followed by a literal`,

{

in: "select in 1 2 3; do echo $i; done",

bsmk: `1:1: "select foo" must be followed by "in", "do", ;, or a newline`,

{

in: "echo foo &\n;",

common: `2:1: ; can only immediately follow a statement`,

{

in: "echo $(foo",

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sh/syntax/parser_test.go at master · ivodvb/sh · GitHub

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