├── COPYING ├── README ├── go.mod ├── shlex.go └── shlex_test.go /COPYING: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. Definitions. 9 | 10 | "License" shall mean the terms and conditions for use, reproduction, 11 | and distribution as defined by Sections 1 through 9 of this document. 12 | 13 | "Licensor" shall mean the copyright owner or entity authorized by 14 | the copyright owner that is granting the License. 15 | 16 | "Legal Entity" shall mean the union of the acting entity and all 17 | other entities that control, are controlled by, or are under common 18 | control with that entity. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README: -------------------------------------------------------------------------------- 1 | go-shlex is a simple lexer for go that supports shell-style quoting, 2 | commenting, and escaping. 3 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/google/shlex 2 | 3 | go 1.13 4 | -------------------------------------------------------------------------------- /shlex.go: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright 2012 Google Inc. All Rights Reserved. 3 | 4 | Licensed under the Apache License, Version 2.0 (the "License"); 5 | you may not use this file except in compliance with the License. 6 | You may obtain a copy of the License at 7 | 8 | http://www.apache.org/licenses/LICENSE-2.0 9 | 10 | Unless required by applicable law or agreed to in writing, software 11 | distributed under the License is distributed on an "AS IS" BASIS, 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | See the License for the specific language governing permissions and 14 | limitations under the License. 15 | */ 16 | 17 | /* 18 | Package shlex implements a simple lexer which splits input in to tokens using 19 | shell-style rules for quoting and commenting. 20 | 21 | The basic use case uses the default ASCII lexer to split a string into sub-strings: 22 | 23 | shlex.Split("one \"two three\" four") -> []string{"one", "two three", "four"} 24 | 25 | To process a stream of strings: 26 | 27 | l := NewLexer(os.Stdin) 28 | for ; token, err := l.Next(); err != nil { 29 | // process token 30 | } 31 | 32 | To access the raw token stream (which includes tokens for comments): 33 | 34 | t := NewTokenizer(os.Stdin) 35 | for ; token, err := t.Next(); err != nil { 36 | // process token 37 | } 38 | 39 | */ 40 | package shlex 41 | 42 | import ( 43 | "bufio" 44 | "fmt" 45 | "io" 46 | "strings" 47 | ) 48 | 49 | // TokenType is a top-level token classification: A word, space, comment, unknown. 50 | type TokenType int 51 | 52 | // runeTokenClass is the type of a UTF-8 character classification: A quote, space, escape. 53 | type runeTokenClass int 54 | 55 | // the internal state used by the lexer state machine 56 | type lexerState int 57 | 58 | // Token is a (type, value) pair representing a lexographical token. 59 | type Token struct { 60 | tokenType TokenType 61 | value string 62 | } 63 | 64 | // Equal reports whether tokens a, and b, are equal. 65 | // Two tokens are equal if both their types and values are equal. A nil token can 66 | // never be equal to another token. 67 | func (a *Token) Equal(b *Token) bool { 68 | if a == nil || b == nil { 69 | return false 70 | } 71 | if a.tokenType != b.tokenType { 72 | return false 73 | } 74 | return a.value == b.value 75 | } 76 | 77 | // Named classes of UTF-8 runes 78 | const ( 79 | spaceRunes = " \t\r\n" 80 | escapingQuoteRunes = `"` 81 | nonEscapingQuoteRunes = "'" 82 | escapeRunes = `\` 83 | commentRunes = "#" 84 | ) 85 | 86 | // Classes of rune token 87 | const ( 88 | unknownRuneClass runeTokenClass = iota 89 | spaceRuneClass 90 | escapingQuoteRuneClass 91 | nonEscapingQuoteRuneClass 92 | escapeRuneClass 93 | commentRuneClass 94 | eofRuneClass 95 | ) 96 | 97 | // Classes of lexographic token 98 | const ( 99 | UnknownToken TokenType = iota 100 | WordToken 101 | SpaceToken 102 | CommentToken 103 | ) 104 | 105 | // Lexer state machine states 106 | const ( 107 | startState lexerState = iota // no runes have been seen 108 | inWordState // processing regular runes in a word 109 | escapingState // we have just consumed an escape rune; the next rune is literal 110 | escapingQuotedState // we have just consumed an escape rune within a quoted string 111 | quotingEscapingState // we are within a quoted string that supports escaping ("...") 112 | quotingState // we are within a string that does not support escaping ('...') 113 | commentState // we are within a comment (everything following an unquoted or unescaped # 114 | ) 115 | 116 | // tokenClassifier is used for classifying rune characters. 117 | type tokenClassifier map[rune]runeTokenClass 118 | 119 | func (typeMap tokenClassifier) addRuneClass(runes string, tokenType runeTokenClass) { 120 | for _, runeChar := range runes { 121 | typeMap[runeChar] = tokenType 122 | } 123 | } 124 | 125 | // newDefaultClassifier creates a new classifier for ASCII characters. 126 | func newDefaultClassifier() tokenClassifier { 127 | t := tokenClassifier{} 128 | t.addRuneClass(spaceRunes, spaceRuneClass) 129 | t.addRuneClass(escapingQuoteRunes, escapingQuoteRuneClass) 130 | t.addRuneClass(nonEscapingQuoteRunes, nonEscapingQuoteRuneClass) 131 | t.addRuneClass(escapeRunes, escapeRuneClass) 132 | t.addRuneClass(commentRunes, commentRuneClass) 133 | return t 134 | } 135 | 136 | // ClassifyRune classifiees a rune 137 | func (t tokenClassifier) ClassifyRune(runeVal rune) runeTokenClass { 138 | return t[runeVal] 139 | } 140 | 141 | // Lexer turns an input stream into a sequence of tokens. Whitespace and comments are skipped. 142 | type Lexer Tokenizer 143 | 144 | // NewLexer creates a new lexer from an input stream. 145 | func NewLexer(r io.Reader) *Lexer { 146 | 147 | return (*Lexer)(NewTokenizer(r)) 148 | } 149 | 150 | // Next returns the next word, or an error. If there are no more words, 151 | // the error will be io.EOF. 152 | func (l *Lexer) Next() (string, error) { 153 | for { 154 | token, err := (*Tokenizer)(l).Next() 155 | if err != nil { 156 | return "", err 157 | } 158 | switch token.tokenType { 159 | case WordToken: 160 | return token.value, nil 161 | case CommentToken: 162 | // skip comments 163 | default: 164 | return "", fmt.Errorf("Unknown token type: %v", token.tokenType) 165 | } 166 | } 167 | } 168 | 169 | // Tokenizer turns an input stream into a sequence of typed tokens 170 | type Tokenizer struct { 171 | input bufio.Reader 172 | classifier tokenClassifier 173 | } 174 | 175 | // NewTokenizer creates a new tokenizer from an input stream. 176 | func NewTokenizer(r io.Reader) *Tokenizer { 177 | input := bufio.NewReader(r) 178 | classifier := newDefaultClassifier() 179 | return &Tokenizer{ 180 | input: *input, 181 | classifier: classifier} 182 | } 183 | 184 | // scanStream scans the stream for the next token using the internal state machine. 185 | // It will panic if it encounters a rune which it does not know how to handle. 186 | func (t *Tokenizer) scanStream() (*Token, error) { 187 | state := startState 188 | var tokenType TokenType 189 | var value []rune 190 | var nextRune rune 191 | var nextRuneType runeTokenClass 192 | var err error 193 | 194 | for { 195 | nextRune, _, err = t.input.ReadRune() 196 | nextRuneType = t.classifier.ClassifyRune(nextRune) 197 | 198 | if err == io.EOF { 199 | nextRuneType = eofRuneClass 200 | err = nil 201 | } else if err != nil { 202 | return nil, err 203 | } 204 | 205 | switch state { 206 | case startState: // no runes read yet 207 | { 208 | switch nextRuneType { 209 | case eofRuneClass: 210 | { 211 | return nil, io.EOF 212 | } 213 | case spaceRuneClass: 214 | { 215 | } 216 | case escapingQuoteRuneClass: 217 | { 218 | tokenType = WordToken 219 | state = quotingEscapingState 220 | } 221 | case nonEscapingQuoteRuneClass: 222 | { 223 | tokenType = WordToken 224 | state = quotingState 225 | } 226 | case escapeRuneClass: 227 | { 228 | tokenType = WordToken 229 | state = escapingState 230 | } 231 | case commentRuneClass: 232 | { 233 | tokenType = CommentToken 234 | state = commentState 235 | } 236 | default: 237 | { 238 | tokenType = WordToken 239 | value = append(value, nextRune) 240 | state = inWordState 241 | } 242 | } 243 | } 244 | case inWordState: // in a regular word 245 | { 246 | switch nextRuneType { 247 | case eofRuneClass: 248 | { 249 | token := &Token{ 250 | tokenType: tokenType, 251 | value: string(value)} 252 | return token, err 253 | } 254 | case spaceRuneClass: 255 | { 256 | token := &Token{ 257 | tokenType: tokenType, 258 | value: string(value)} 259 | return token, err 260 | } 261 | case escapingQuoteRuneClass: 262 | { 263 | state = quotingEscapingState 264 | } 265 | case nonEscapingQuoteRuneClass: 266 | { 267 | state = quotingState 268 | } 269 | case escapeRuneClass: 270 | { 271 | state = escapingState 272 | } 273 | default: 274 | { 275 | value = append(value, nextRune) 276 | } 277 | } 278 | } 279 | case escapingState: // the rune after an escape character 280 | { 281 | switch nextRuneType { 282 | case eofRuneClass: 283 | { 284 | err = fmt.Errorf("EOF found after escape character") 285 | token := &Token{ 286 | tokenType: tokenType, 287 | value: string(value)} 288 | return token, err 289 | } 290 | default: 291 | { 292 | state = inWordState 293 | value = append(value, nextRune) 294 | } 295 | } 296 | } 297 | case escapingQuotedState: // the next rune after an escape character, in double quotes 298 | { 299 | switch nextRuneType { 300 | case eofRuneClass: 301 | { 302 | err = fmt.Errorf("EOF found after escape character") 303 | token := &Token{ 304 | tokenType: tokenType, 305 | value: string(value)} 306 | return token, err 307 | } 308 | default: 309 | { 310 | state = quotingEscapingState 311 | value = append(value, nextRune) 312 | } 313 | } 314 | } 315 | case quotingEscapingState: // in escaping double quotes 316 | { 317 | switch nextRuneType { 318 | case eofRuneClass: 319 | { 320 | err = fmt.Errorf("EOF found when expecting closing quote") 321 | token := &Token{ 322 | tokenType: tokenType, 323 | value: string(value)} 324 | return token, err 325 | } 326 | case escapingQuoteRuneClass: 327 | { 328 | state = inWordState 329 | } 330 | case escapeRuneClass: 331 | { 332 | state = escapingQuotedState 333 | } 334 | default: 335 | { 336 | value = append(value, nextRune) 337 | } 338 | } 339 | } 340 | case quotingState: // in non-escaping single quotes 341 | { 342 | switch nextRuneType { 343 | case eofRuneClass: 344 | { 345 | err = fmt.Errorf("EOF found when expecting closing quote") 346 | token := &Token{ 347 | tokenType: tokenType, 348 | value: string(value)} 349 | return token, err 350 | } 351 | case nonEscapingQuoteRuneClass: 352 | { 353 | state = inWordState 354 | } 355 | default: 356 | { 357 | value = append(value, nextRune) 358 | } 359 | } 360 | } 361 | case commentState: // in a comment 362 | { 363 | switch nextRuneType { 364 | case eofRuneClass: 365 | { 366 | token := &Token{ 367 | tokenType: tokenType, 368 | value: string(value)} 369 | return token, err 370 | } 371 | case spaceRuneClass: 372 | { 373 | if nextRune == '\n' { 374 | state = startState 375 | token := &Token{ 376 | tokenType: tokenType, 377 | value: string(value)} 378 | return token, err 379 | } else { 380 | value = append(value, nextRune) 381 | } 382 | } 383 | default: 384 | { 385 | value = append(value, nextRune) 386 | } 387 | } 388 | } 389 | default: 390 | { 391 | return nil, fmt.Errorf("Unexpected state: %v", state) 392 | } 393 | } 394 | } 395 | } 396 | 397 | // Next returns the next token in the stream. 398 | func (t *Tokenizer) Next() (*Token, error) { 399 | return t.scanStream() 400 | } 401 | 402 | // Split partitions a string into a slice of strings. 403 | func Split(s string) ([]string, error) { 404 | l := NewLexer(strings.NewReader(s)) 405 | subStrings := make([]string, 0) 406 | for { 407 | word, err := l.Next() 408 | if err != nil { 409 | if err == io.EOF { 410 | return subStrings, nil 411 | } 412 | return subStrings, err 413 | } 414 | subStrings = append(subStrings, word) 415 | } 416 | } 417 | -------------------------------------------------------------------------------- /shlex_test.go: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright 2012 Google Inc. All Rights Reserved. 3 | 4 | Licensed under the Apache License, Version 2.0 (the "License"); 5 | you may not use this file except in compliance with the License. 6 | You may obtain a copy of the License at 7 | 8 | http://www.apache.org/licenses/LICENSE-2.0 9 | 10 | Unless required by applicable law or agreed to in writing, software 11 | distributed under the License is distributed on an "AS IS" BASIS, 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | See the License for the specific language governing permissions and 14 | limitations under the License. 15 | */ 16 | 17 | package shlex 18 | 19 | import ( 20 | "strings" 21 | "testing" 22 | ) 23 | 24 | var ( 25 | // one two "three four" "five \"six\"" seven#eight # nine # ten 26 | // eleven 'twelve\' 27 | testString = "one two \"three four\" \"five \\\"six\\\"\" seven#eight # nine # ten\n eleven 'twelve\\' thirteen=13 fourteen/14" 28 | ) 29 | 30 | func TestClassifier(t *testing.T) { 31 | classifier := newDefaultClassifier() 32 | tests := map[rune]runeTokenClass{ 33 | ' ': spaceRuneClass, 34 | '"': escapingQuoteRuneClass, 35 | '\'': nonEscapingQuoteRuneClass, 36 | '#': commentRuneClass} 37 | for runeChar, want := range tests { 38 | got := classifier.ClassifyRune(runeChar) 39 | if got != want { 40 | t.Errorf("ClassifyRune(%v) -> %v. Want: %v", runeChar, got, want) 41 | } 42 | } 43 | } 44 | 45 | func TestTokenizer(t *testing.T) { 46 | testInput := strings.NewReader(testString) 47 | expectedTokens := []*Token{ 48 | &Token{WordToken, "one"}, 49 | &Token{WordToken, "two"}, 50 | &Token{WordToken, "three four"}, 51 | &Token{WordToken, "five \"six\""}, 52 | &Token{WordToken, "seven#eight"}, 53 | &Token{CommentToken, " nine # ten"}, 54 | &Token{WordToken, "eleven"}, 55 | &Token{WordToken, "twelve\\"}, 56 | &Token{WordToken, "thirteen=13"}, 57 | &Token{WordToken, "fourteen/14"}} 58 | 59 | tokenizer := NewTokenizer(testInput) 60 | for i, want := range expectedTokens { 61 | got, err := tokenizer.Next() 62 | if err != nil { 63 | t.Error(err) 64 | } 65 | if !got.Equal(want) { 66 | t.Errorf("Tokenizer.Next()[%v] of %q -> %v. Want: %v", i, testString, got, want) 67 | } 68 | } 69 | } 70 | 71 | func TestLexer(t *testing.T) { 72 | testInput := strings.NewReader(testString) 73 | expectedStrings := []string{"one", "two", "three four", "five \"six\"", "seven#eight", "eleven", "twelve\\", "thirteen=13", "fourteen/14"} 74 | 75 | lexer := NewLexer(testInput) 76 | for i, want := range expectedStrings { 77 | got, err := lexer.Next() 78 | if err != nil { 79 | t.Error(err) 80 | } 81 | if got != want { 82 | t.Errorf("Lexer.Next()[%v] of %q -> %v. Want: %v", i, testString, got, want) 83 | } 84 | } 85 | } 86 | 87 | func TestSplit(t *testing.T) { 88 | want := []string{"one", "two", "three four", "five \"six\"", "seven#eight", "eleven", "twelve\\", "thirteen=13", "fourteen/14"} 89 | got, err := Split(testString) 90 | if err != nil { 91 | t.Error(err) 92 | } 93 | if len(want) != len(got) { 94 | t.Errorf("Split(%q) -> %v. Want: %v", testString, got, want) 95 | } 96 | for i := range got { 97 | if got[i] != want[i] { 98 | t.Errorf("Split(%q)[%v] -> %v. Want: %v", testString, i, got[i], want[i]) 99 | } 100 | } 101 | } 102 | --------------------------------------------------------------------------------