Vendor go-shlex.
Signed-off-by: Daniel Nephin <dnephin@docker.com>
This commit is contained in:
Daniel Nephin
parent
58624acf11
commit
3464589c2a
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@ -0,0 +1,202 @@
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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@ -0,0 +1,21 @@
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# Copyright 2011 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
|
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# limitations under the License.
|
||||
|
||||
include $(GOROOT)/src/Make.inc
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|
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TARG=shlex
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GOFILES=\
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shlex.go\
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include $(GOROOT)/src/Make.pkg
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|
@ -0,0 +1,2 @@
|
|||
go-shlex is a simple lexer for go that supports shell-style quoting,
|
||||
commenting, and escaping.
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|
|
@ -0,0 +1,457 @@
|
|||
/*
|
||||
Copyright 2012 Google Inc. All Rights Reserved.
|
||||
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
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You may obtain a copy of the License at
|
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|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
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|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
|
||||
package shlex
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||||
|
||||
/*
|
||||
Package shlex implements a simple lexer which splits input in to tokens using
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shell-style rules for quoting and commenting.
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||||
*/
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||||
import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"strings"
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||||
)
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/*
|
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A TokenType is a top-level token; a word, space, comment, unknown.
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*/
|
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type TokenType int
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/*
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A RuneTokenType is the type of a UTF-8 character; a character, quote, space, escape.
|
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*/
|
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type RuneTokenType int
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|
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type lexerState int
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type Token struct {
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tokenType TokenType
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value string
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}
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|
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/*
|
||||
Two tokens are equal if both their types and values are equal. A nil token can
|
||||
never equal another token.
|
||||
*/
|
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func (a *Token) Equal(b *Token) bool {
|
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if a == nil || b == nil {
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return false
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}
|
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if a.tokenType != b.tokenType {
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return false
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}
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return a.value == b.value
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}
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const (
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RUNE_CHAR string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789._-,/@$*()+=><:;&^%~|!?[]{}"
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RUNE_SPACE string = " \t\r\n"
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RUNE_ESCAPING_QUOTE string = "\""
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RUNE_NONESCAPING_QUOTE string = "'"
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RUNE_ESCAPE = "\\"
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RUNE_COMMENT = "#"
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RUNETOKEN_UNKNOWN RuneTokenType = 0
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RUNETOKEN_CHAR RuneTokenType = 1
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RUNETOKEN_SPACE RuneTokenType = 2
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RUNETOKEN_ESCAPING_QUOTE RuneTokenType = 3
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RUNETOKEN_NONESCAPING_QUOTE RuneTokenType = 4
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RUNETOKEN_ESCAPE RuneTokenType = 5
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RUNETOKEN_COMMENT RuneTokenType = 6
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RUNETOKEN_EOF RuneTokenType = 7
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TOKEN_UNKNOWN TokenType = 0
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TOKEN_WORD TokenType = 1
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TOKEN_SPACE TokenType = 2
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TOKEN_COMMENT TokenType = 3
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STATE_START lexerState = 0
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STATE_INWORD lexerState = 1
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STATE_ESCAPING lexerState = 2
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STATE_ESCAPING_QUOTED lexerState = 3
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STATE_QUOTED_ESCAPING lexerState = 4
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STATE_QUOTED lexerState = 5
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STATE_COMMENT lexerState = 6
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INITIAL_TOKEN_CAPACITY int = 100
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)
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/*
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A type for classifying characters. This allows for different sorts of
|
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classifiers - those accepting extended non-ascii chars, or strict posix
|
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compatibility, for example.
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*/
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type TokenClassifier struct {
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typeMap map[int32]RuneTokenType
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}
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func addRuneClass(typeMap *map[int32]RuneTokenType, runes string, tokenType RuneTokenType) {
|
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for _, rune := range runes {
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(*typeMap)[int32(rune)] = tokenType
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||||
}
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||||
}
|
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|
||||
/*
|
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Create a new classifier for basic ASCII characters.
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||||
*/
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func NewDefaultClassifier() *TokenClassifier {
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typeMap := map[int32]RuneTokenType{}
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addRuneClass(&typeMap, RUNE_CHAR, RUNETOKEN_CHAR)
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addRuneClass(&typeMap, RUNE_SPACE, RUNETOKEN_SPACE)
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addRuneClass(&typeMap, RUNE_ESCAPING_QUOTE, RUNETOKEN_ESCAPING_QUOTE)
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||||
addRuneClass(&typeMap, RUNE_NONESCAPING_QUOTE, RUNETOKEN_NONESCAPING_QUOTE)
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addRuneClass(&typeMap, RUNE_ESCAPE, RUNETOKEN_ESCAPE)
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||||
addRuneClass(&typeMap, RUNE_COMMENT, RUNETOKEN_COMMENT)
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return &TokenClassifier{
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typeMap: typeMap}
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||||
}
|
||||
|
||||
func (classifier *TokenClassifier) ClassifyRune(rune int32) RuneTokenType {
|
||||
return classifier.typeMap[rune]
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}
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||||
|
||||
/*
|
||||
A type for turning an input stream in to a sequence of strings. Whitespace and
|
||||
comments are skipped.
|
||||
*/
|
||||
type Lexer struct {
|
||||
tokenizer *Tokenizer
|
||||
}
|
||||
|
||||
/*
|
||||
Create a new lexer.
|
||||
*/
|
||||
func NewLexer(r io.Reader) (*Lexer, error) {
|
||||
|
||||
tokenizer, err := NewTokenizer(r)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
lexer := &Lexer{tokenizer: tokenizer}
|
||||
return lexer, nil
|
||||
}
|
||||
|
||||
/*
|
||||
Return the next word, and an error value. If there are no more words, the error
|
||||
will be io.EOF.
|
||||
*/
|
||||
func (l *Lexer) NextWord() (string, error) {
|
||||
var token *Token
|
||||
var err error
|
||||
for {
|
||||
token, err = l.tokenizer.NextToken()
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
switch token.tokenType {
|
||||
case TOKEN_WORD:
|
||||
{
|
||||
return token.value, nil
|
||||
}
|
||||
case TOKEN_COMMENT:
|
||||
{
|
||||
// skip comments
|
||||
}
|
||||
default:
|
||||
{
|
||||
panic(fmt.Sprintf("Unknown token type: %v", token.tokenType))
|
||||
}
|
||||
}
|
||||
}
|
||||
return "", io.EOF
|
||||
}
|
||||
|
||||
/*
|
||||
A type for turning an input stream in to a sequence of typed tokens.
|
||||
*/
|
||||
type Tokenizer struct {
|
||||
input *bufio.Reader
|
||||
classifier *TokenClassifier
|
||||
}
|
||||
|
||||
/*
|
||||
Create a new tokenizer.
|
||||
*/
|
||||
func NewTokenizer(r io.Reader) (*Tokenizer, error) {
|
||||
input := bufio.NewReader(r)
|
||||
classifier := NewDefaultClassifier()
|
||||
tokenizer := &Tokenizer{
|
||||
input: input,
|
||||
classifier: classifier}
|
||||
return tokenizer, nil
|
||||
}
|
||||
|
||||
/*
|
||||
Scan the stream for the next token.
|
||||
|
||||
This uses an internal state machine. It will panic if it encounters a character
|
||||
which it does not know how to handle.
|
||||
*/
|
||||
func (t *Tokenizer) scanStream() (*Token, error) {
|
||||
state := STATE_START
|
||||
var tokenType TokenType
|
||||
value := make([]int32, 0, INITIAL_TOKEN_CAPACITY)
|
||||
var (
|
||||
nextRune int32
|
||||
nextRuneType RuneTokenType
|
||||
err error
|
||||
)
|
||||
SCAN:
|
||||
for {
|
||||
nextRune, _, err = t.input.ReadRune()
|
||||
nextRuneType = t.classifier.ClassifyRune(nextRune)
|
||||
if err != nil {
|
||||
if err == io.EOF {
|
||||
nextRuneType = RUNETOKEN_EOF
|
||||
err = nil
|
||||
} else {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
switch state {
|
||||
case STATE_START: // no runes read yet
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
return nil, io.EOF
|
||||
}
|
||||
case RUNETOKEN_CHAR:
|
||||
{
|
||||
tokenType = TOKEN_WORD
|
||||
value = append(value, nextRune)
|
||||
state = STATE_INWORD
|
||||
}
|
||||
case RUNETOKEN_SPACE:
|
||||
{
|
||||
}
|
||||
case RUNETOKEN_ESCAPING_QUOTE:
|
||||
{
|
||||
tokenType = TOKEN_WORD
|
||||
state = STATE_QUOTED_ESCAPING
|
||||
}
|
||||
case RUNETOKEN_NONESCAPING_QUOTE:
|
||||
{
|
||||
tokenType = TOKEN_WORD
|
||||
state = STATE_QUOTED
|
||||
}
|
||||
case RUNETOKEN_ESCAPE:
|
||||
{
|
||||
tokenType = TOKEN_WORD
|
||||
state = STATE_ESCAPING
|
||||
}
|
||||
case RUNETOKEN_COMMENT:
|
||||
{
|
||||
tokenType = TOKEN_COMMENT
|
||||
state = STATE_COMMENT
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Unknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_INWORD: // in a regular word
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_COMMENT:
|
||||
{
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
case RUNETOKEN_SPACE:
|
||||
{
|
||||
t.input.UnreadRune()
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_ESCAPING_QUOTE:
|
||||
{
|
||||
state = STATE_QUOTED_ESCAPING
|
||||
}
|
||||
case RUNETOKEN_NONESCAPING_QUOTE:
|
||||
{
|
||||
state = STATE_QUOTED
|
||||
}
|
||||
case RUNETOKEN_ESCAPE:
|
||||
{
|
||||
state = STATE_ESCAPING
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_ESCAPING: // the next rune after an escape character
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
err = errors.New("EOF found after escape character")
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_SPACE, RUNETOKEN_ESCAPING_QUOTE, RUNETOKEN_NONESCAPING_QUOTE, RUNETOKEN_ESCAPE, RUNETOKEN_COMMENT:
|
||||
{
|
||||
state = STATE_INWORD
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_ESCAPING_QUOTED: // the next rune after an escape character, in double quotes
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
err = errors.New("EOF found after escape character")
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_SPACE, RUNETOKEN_ESCAPING_QUOTE, RUNETOKEN_NONESCAPING_QUOTE, RUNETOKEN_ESCAPE, RUNETOKEN_COMMENT:
|
||||
{
|
||||
state = STATE_QUOTED_ESCAPING
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_QUOTED_ESCAPING: // in escaping double quotes
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
err = errors.New("EOF found when expecting closing quote.")
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_UNKNOWN, RUNETOKEN_SPACE, RUNETOKEN_NONESCAPING_QUOTE, RUNETOKEN_COMMENT:
|
||||
{
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
case RUNETOKEN_ESCAPING_QUOTE:
|
||||
{
|
||||
state = STATE_INWORD
|
||||
}
|
||||
case RUNETOKEN_ESCAPE:
|
||||
{
|
||||
state = STATE_ESCAPING_QUOTED
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_QUOTED: // in non-escaping single quotes
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
err = errors.New("EOF found when expecting closing quote.")
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_UNKNOWN, RUNETOKEN_SPACE, RUNETOKEN_ESCAPING_QUOTE, RUNETOKEN_ESCAPE, RUNETOKEN_COMMENT:
|
||||
{
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
case RUNETOKEN_NONESCAPING_QUOTE:
|
||||
{
|
||||
state = STATE_INWORD
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
case STATE_COMMENT:
|
||||
{
|
||||
switch nextRuneType {
|
||||
case RUNETOKEN_EOF:
|
||||
{
|
||||
break SCAN
|
||||
}
|
||||
case RUNETOKEN_CHAR, RUNETOKEN_UNKNOWN, RUNETOKEN_ESCAPING_QUOTE, RUNETOKEN_ESCAPE, RUNETOKEN_COMMENT, RUNETOKEN_NONESCAPING_QUOTE:
|
||||
{
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
case RUNETOKEN_SPACE:
|
||||
{
|
||||
if nextRune == '\n' {
|
||||
state = STATE_START
|
||||
break SCAN
|
||||
} else {
|
||||
value = append(value, nextRune)
|
||||
}
|
||||
}
|
||||
default:
|
||||
{
|
||||
return nil, errors.New(fmt.Sprintf("Uknown rune: %v", nextRune))
|
||||
}
|
||||
}
|
||||
}
|
||||
default:
|
||||
{
|
||||
panic(fmt.Sprintf("Unexpected state: %v", state))
|
||||
}
|
||||
}
|
||||
}
|
||||
token := &Token{
|
||||
tokenType: tokenType,
|
||||
value: string(value)}
|
||||
return token, err
|
||||
}
|
||||
|
||||
/*
|
||||
Return the next token in the stream, and an error value. If there are no more
|
||||
tokens available, the error value will be io.EOF.
|
||||
*/
|
||||
func (t *Tokenizer) NextToken() (*Token, error) {
|
||||
return t.scanStream()
|
||||
}
|
||||
|
||||
/*
|
||||
Split a string in to a slice of strings, based upon shell-style rules for
|
||||
quoting, escaping, and spaces.
|
||||
*/
|
||||
func Split(s string) ([]string, error) {
|
||||
l, err := NewLexer(strings.NewReader(s))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
subStrings := []string{}
|
||||
for {
|
||||
word, err := l.NextWord()
|
||||
if err != nil {
|
||||
if err == io.EOF {
|
||||
return subStrings, nil
|
||||
}
|
||||
return subStrings, err
|
||||
}
|
||||
subStrings = append(subStrings, word)
|
||||
}
|
||||
return subStrings, nil
|
||||
}
|
||||
Loading…
Reference in New Issue