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| 1 | <?php |
| 2 | /** |
| 3 | * Copyright 2011 Paul Copperman <paul.copperman@gmail.com> |
| 4 | * Copyright 2018 Timo Tijhof |
| 5 | * Copyright 2021 Roan Kattouw <roan.kattouw@gmail.com> |
| 6 | * |
| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | * you may not use this file except in compliance with the License. |
| 9 | * You may obtain a copy of the License at |
| 10 | * |
| 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | * |
| 13 | * Unless required by applicable law or agreed to in writing, software |
| 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | * See the License for the specific language governing permissions and |
| 17 | * limitations under the License. |
| 18 | * |
| 19 | * @file |
| 20 | * @license Apache-2.0 |
| 21 | * @license MIT |
| 22 | * @license GPL-2.0-or-later |
| 23 | * @license LGPL-2.1-or-later |
| 24 | */ |
| 25 | |
| 26 | namespace Wikimedia\Minify; |
| 27 | |
| 28 | /** |
| 29 | * JavaScript Minifier |
| 30 | * |
| 31 | * This class is meant to safely minify JavaScript code, while leaving syntactically correct |
| 32 | * programs intact. Other libraries, such as JSMin require a certain coding style to work |
| 33 | * correctly. OTOH, libraries like jsminplus, that do parse the code correctly are rather |
| 34 | * slow, because they construct a complete parse tree before outputting the code minified. |
| 35 | * So this class is meant to allow arbitrary (but syntactically correct) input, while being |
| 36 | * fast enough to be used for on-the-fly minifying. |
| 37 | * |
| 38 | * This class was written with ECMA-262 7th Edition in mind ("ECMAScript 2016"). Parsing features |
| 39 | * new to later editions of ECMAScript might not be supported. It's assumed that the input is |
| 40 | * syntactically correct; if it's not, this class may not detect that, and may produce incorrect |
| 41 | * output. |
| 42 | * |
| 43 | * This class has limited support for 8.0 spec ("ECMAScript 2017"), specifically, the await |
| 44 | * keyword and most kinds of async functions are implemented. Other new parsing features of ES2017 |
| 45 | * are not yet supported. |
| 46 | * |
| 47 | * See also: |
| 48 | * - <https://262.ecma-international.org/8.0/> |
| 49 | * - <https://262.ecma-international.org/7.0/> |
| 50 | * - <https://262.ecma-international.org/6.0/> |
| 51 | */ |
| 52 | class JavaScriptMinifier { |
| 53 | |
| 54 | /* Parsing states. |
| 55 | * The state machine is necessary to decide whether to parse a slash as division |
| 56 | * operator or as regexp literal, and to know where semicolon insertion is possible. |
| 57 | * States are generally named after the next expected item. We only distinguish states when the |
| 58 | * distinction is relevant for our purpose. The meaning of these states is documented |
| 59 | * in $model below. |
| 60 | * |
| 61 | * Negative numbers are used to indicate that the state is inside a generator function, |
| 62 | * which changes the behavior of 'yield' |
| 63 | */ |
| 64 | private const STATEMENT = 1; |
| 65 | private const CONDITION = 2; |
| 66 | private const FUNC = 3; |
| 67 | private const GENFUNC = 4; |
| 68 | private const PROPERTY_ASSIGNMENT = 5; |
| 69 | private const EXPRESSION = 6; |
| 70 | private const EXPRESSION_NO_NL = 7; |
| 71 | private const EXPRESSION_OP = 8; |
| 72 | private const EXPRESSION_DOT = 9; |
| 73 | private const EXPRESSION_END = 10; |
| 74 | private const EXPRESSION_ARROWFUNC = 11; |
| 75 | private const EXPRESSION_TERNARY = 12; |
| 76 | private const EXPRESSION_TERNARY_OP = 13; |
| 77 | private const EXPRESSION_TERNARY_DOT = 14; |
| 78 | private const EXPRESSION_TERNARY_ARROWFUNC = 15; |
| 79 | private const PAREN_EXPRESSION = 16; |
| 80 | private const PAREN_EXPRESSION_OP = 17; |
| 81 | private const PAREN_EXPRESSION_DOT = 18; |
| 82 | private const PAREN_EXPRESSION_ARROWFUNC = 19; |
| 83 | private const PROPERTY_EXPRESSION = 20; |
| 84 | private const PROPERTY_EXPRESSION_OP = 21; |
| 85 | private const PROPERTY_EXPRESSION_DOT = 22; |
| 86 | private const PROPERTY_EXPRESSION_ARROWFUNC = 23; |
| 87 | private const CLASS_DEF = 24; |
| 88 | private const IMPORT_EXPORT = 25; |
| 89 | private const TEMPLATE_STRING_HEAD = 26; |
| 90 | private const TEMPLATE_STRING_TAIL = 27; |
| 91 | private const PAREN_EXPRESSION_OP_NO_NL = 28; |
| 92 | |
| 93 | /* Token types */ |
| 94 | private const TYPE_UN_OP = 101; // unary operators |
| 95 | private const TYPE_INCR_OP = 102; // ++ and -- |
| 96 | private const TYPE_BIN_OP = 103; // binary operators (except .) |
| 97 | private const TYPE_ADD_OP = 104; // + and - which can be either unary or binary ops |
| 98 | private const TYPE_DOT = 105; // . |
| 99 | private const TYPE_HOOK = 106; // ? |
| 100 | private const TYPE_COLON = 107; // : |
| 101 | private const TYPE_COMMA = 108; // , |
| 102 | private const TYPE_SEMICOLON = 109; // ; |
| 103 | private const TYPE_BRACE_OPEN = 110; // { |
| 104 | private const TYPE_BRACE_CLOSE = 111; // } |
| 105 | private const TYPE_PAREN_OPEN = 112; // ( and [ |
| 106 | private const TYPE_PAREN_CLOSE = 113; // ) and ] |
| 107 | private const TYPE_ARROW = 114; // => |
| 108 | private const TYPE_RETURN = 115; // keywords: break, continue, return, throw |
| 109 | private const TYPE_IF = 116; // keywords: catch, for, with, switch, while, if |
| 110 | private const TYPE_DO = 117; // keywords: case, finally, else, do, try |
| 111 | private const TYPE_VAR = 118; // keywords: var, let, const |
| 112 | private const TYPE_YIELD = 119; // keywords: yield |
| 113 | private const TYPE_FUNC = 120; // keywords: function |
| 114 | private const TYPE_CLASS = 121; // keywords: class |
| 115 | private const TYPE_LITERAL = 122; // all literals, identifiers, unrecognised tokens, and other keywords |
| 116 | private const TYPE_SPECIAL = 123; // For special treatment of tokens that usually mean something else |
| 117 | private const TYPE_ASYNC = 124; // keywords: async |
| 118 | private const TYPE_AWAIT = 125; // keywords: await |
| 119 | |
| 120 | private const ACTION_GOTO = 201; // Go to another state |
| 121 | private const ACTION_PUSH = 202; // Push a state to the stack |
| 122 | private const ACTION_POP = 203; // Pop the state from the top of the stack, and go to that state |
| 123 | |
| 124 | // Limit to avoid excessive memory usage |
| 125 | private const STACK_LIMIT = 1000; |
| 126 | |
| 127 | // Length of the longest token in $tokenTypes made of punctuation characters, |
| 128 | // as defined in $opChars. Update this if you add longer tokens to $tokenTypes. |
| 129 | // |
| 130 | // Currently the longest punctuation token is `>>>=`, which is 4 characters. |
| 131 | private const LONGEST_PUNCTUATION_TOKEN = 4; |
| 132 | |
| 133 | /** |
| 134 | * @var int $maxLineLength |
| 135 | * |
| 136 | * Maximum line length |
| 137 | * |
| 138 | * This is not a strict maximum, but a guideline. Longer lines will be |
| 139 | * produced when literals (e.g. quoted strings) longer than this are |
| 140 | * encountered, or when required to guard against semicolon insertion. |
| 141 | * |
| 142 | * This is a private member (instead of constant) to allow tests to |
| 143 | * set it to 1, to verify ASI and line-breaking behaviour. |
| 144 | */ |
| 145 | private static $maxLineLength = 1000; |
| 146 | |
| 147 | private static $expandedStates = false; |
| 148 | |
| 149 | /** |
| 150 | * @var array $opChars |
| 151 | * |
| 152 | * Characters which can be combined without whitespace between them. |
| 153 | */ |
| 154 | private static $opChars = [ |
| 155 | // ECMAScript 6.0 § 11.7 Punctuators |
| 156 | // Unlike the spec, these are individual symbols, not sequences. |
| 157 | '{' => true, |
| 158 | '}' => true, |
| 159 | '(' => true, |
| 160 | ')' => true, |
| 161 | '[' => true, |
| 162 | ']' => true, |
| 163 | // Dots have a special case after $dotlessNum which require whitespace |
| 164 | '.' => true, |
| 165 | ';' => true, |
| 166 | ',' => true, |
| 167 | '<' => true, |
| 168 | '>' => true, |
| 169 | '=' => true, |
| 170 | '!' => true, |
| 171 | '+' => true, |
| 172 | '-' => true, |
| 173 | '*' => true, |
| 174 | '%' => true, |
| 175 | '&' => true, |
| 176 | '|' => true, |
| 177 | '^' => true, |
| 178 | '~' => true, |
| 179 | '?' => true, |
| 180 | ':' => true, |
| 181 | '/' => true, |
| 182 | // ECMAScript 6.0 § 11.8.4 String Literals |
| 183 | '"' => true, |
| 184 | "'" => true, |
| 185 | // ECMAScript 6.0 § 11.8.6 Template Literal Lexical Components |
| 186 | '`' => true, |
| 187 | ]; |
| 188 | |
| 189 | /** |
| 190 | * @var array $tokenTypes |
| 191 | * |
| 192 | * Tokens and their types. |
| 193 | */ |
| 194 | private static $tokenTypes = [ |
| 195 | // ECMAScript 6.0 § 12.5 Unary Operators |
| 196 | // UnaryExpression includes PostfixExpression, which includes 'new'. |
| 197 | 'new' => self::TYPE_UN_OP, |
| 198 | 'delete' => self::TYPE_UN_OP, |
| 199 | 'void' => self::TYPE_UN_OP, |
| 200 | 'typeof' => self::TYPE_UN_OP, |
| 201 | '~' => self::TYPE_UN_OP, |
| 202 | '!' => self::TYPE_UN_OP, |
| 203 | // ECMAScript 8.0 § 14.6 AwaitExpression |
| 204 | // |
| 205 | // await UnaryExpression |
| 206 | // |
| 207 | 'await' => self::TYPE_AWAIT, |
| 208 | // ECMAScript 6.0 § 12.2 Primary Expression, among others |
| 209 | '...' => self::TYPE_UN_OP, |
| 210 | // ECMAScript 6.0 § 12.7 Additive Operators |
| 211 | '++' => self::TYPE_INCR_OP, |
| 212 | '--' => self::TYPE_INCR_OP, |
| 213 | '+' => self::TYPE_ADD_OP, |
| 214 | '-' => self::TYPE_ADD_OP, |
| 215 | // ECMAScript 6.0 § 12.6 Multiplicative Operators |
| 216 | '*' => self::TYPE_BIN_OP, |
| 217 | '/' => self::TYPE_BIN_OP, |
| 218 | '%' => self::TYPE_BIN_OP, |
| 219 | // ECMAScript 7.0 § 12.6 Exponentiation Operator |
| 220 | '**' => self::TYPE_BIN_OP, |
| 221 | // ECMAScript 6.0 § 12.8 Bitwise Shift Operators |
| 222 | '<<' => self::TYPE_BIN_OP, |
| 223 | '>>' => self::TYPE_BIN_OP, |
| 224 | '>>>' => self::TYPE_BIN_OP, |
| 225 | // ECMAScript 6.0 § 12.9 Relational Operators |
| 226 | '<' => self::TYPE_BIN_OP, |
| 227 | '>' => self::TYPE_BIN_OP, |
| 228 | '<=' => self::TYPE_BIN_OP, |
| 229 | '>=' => self::TYPE_BIN_OP, |
| 230 | 'instanceof' => self::TYPE_BIN_OP, |
| 231 | 'in' => self::TYPE_BIN_OP, |
| 232 | // ECMAScript 6.0 § 12.10 Equality Operators |
| 233 | '==' => self::TYPE_BIN_OP, |
| 234 | '!=' => self::TYPE_BIN_OP, |
| 235 | '===' => self::TYPE_BIN_OP, |
| 236 | '!==' => self::TYPE_BIN_OP, |
| 237 | // ECMAScript 6.0 § 12.11 Binary Bitwise Operators |
| 238 | '&' => self::TYPE_BIN_OP, |
| 239 | '^' => self::TYPE_BIN_OP, |
| 240 | '|' => self::TYPE_BIN_OP, |
| 241 | // ECMAScript 6.0 § 12.12 Binary Logical Operators |
| 242 | '&&' => self::TYPE_BIN_OP, |
| 243 | '||' => self::TYPE_BIN_OP, |
| 244 | // ECMAScript 6.0 § 12.13 Conditional Operator |
| 245 | // Also known as ternary. |
| 246 | '?' => self::TYPE_HOOK, |
| 247 | ':' => self::TYPE_COLON, |
| 248 | // ECMAScript 6.0 § 12.14 Assignment Operators |
| 249 | '=' => self::TYPE_BIN_OP, |
| 250 | '*=' => self::TYPE_BIN_OP, |
| 251 | '/=' => self::TYPE_BIN_OP, |
| 252 | '%=' => self::TYPE_BIN_OP, |
| 253 | '+=' => self::TYPE_BIN_OP, |
| 254 | '-=' => self::TYPE_BIN_OP, |
| 255 | '<<=' => self::TYPE_BIN_OP, |
| 256 | '>>=' => self::TYPE_BIN_OP, |
| 257 | '>>>=' => self::TYPE_BIN_OP, |
| 258 | '&=' => self::TYPE_BIN_OP, |
| 259 | '^=' => self::TYPE_BIN_OP, |
| 260 | '|=' => self::TYPE_BIN_OP, |
| 261 | // ECMAScript 6.0 § 12.15 Comma Operator |
| 262 | ',' => self::TYPE_COMMA, |
| 263 | |
| 264 | // The keywords that disallow LineTerminator before their |
| 265 | // (sometimes optional) Expression or Identifier. |
| 266 | // |
| 267 | // keyword ; |
| 268 | // keyword [no LineTerminator here] Identifier ; |
| 269 | // keyword [no LineTerminator here] Expression ; |
| 270 | // |
| 271 | // See also ECMAScript 6.0 § 11.9.1 Rules of Automatic Semicolon Insertion |
| 272 | 'continue' => self::TYPE_RETURN, |
| 273 | 'break' => self::TYPE_RETURN, |
| 274 | 'return' => self::TYPE_RETURN, |
| 275 | 'throw' => self::TYPE_RETURN, |
| 276 | // yield is only a keyword inside generator functions, otherwise it's an identifier |
| 277 | // This is handled with the negative states hack: if the state is negative, TYPE_YIELD |
| 278 | // is treated as TYPE_RETURN, if it's positive it's treated as TYPE_LITERAL |
| 279 | 'yield' => self::TYPE_YIELD, |
| 280 | |
| 281 | // The keywords require a parenthesised Expression or Identifier |
| 282 | // before the next Statement. |
| 283 | // |
| 284 | // keyword ( Expression ) Statement |
| 285 | // keyword ( Identifier ) Statement |
| 286 | // |
| 287 | // See also ECMAScript 6.0: |
| 288 | // - § 13.6 The if Statement |
| 289 | // - § 13.7 Iteration Statements (do, while, for) |
| 290 | // - § 12.10 The with Statement |
| 291 | // - § 12.11 The switch Statement |
| 292 | // - § 12.13 The throw Statement |
| 293 | 'if' => self::TYPE_IF, |
| 294 | 'catch' => self::TYPE_IF, |
| 295 | 'while' => self::TYPE_IF, |
| 296 | 'for' => self::TYPE_IF, |
| 297 | 'switch' => self::TYPE_IF, |
| 298 | 'with' => self::TYPE_IF, |
| 299 | |
| 300 | // The keywords followed by a Statement, Expression, or Block. |
| 301 | // |
| 302 | // else Statement |
| 303 | // do Statement |
| 304 | // case Expression |
| 305 | // try Block |
| 306 | // finally Block |
| 307 | // |
| 308 | // See also ECMAScript 6.0: |
| 309 | // - § 13.6 The if Statement (else) |
| 310 | // - § 13.7 Iteration Statements (do, while, for) |
| 311 | // - § 13.12 The switch Statement (case) |
| 312 | // - § 13.15 The try Statement |
| 313 | 'else' => self::TYPE_DO, |
| 314 | 'do' => self::TYPE_DO, |
| 315 | 'case' => self::TYPE_DO, |
| 316 | 'try' => self::TYPE_DO, |
| 317 | 'finally' => self::TYPE_DO, |
| 318 | |
| 319 | // Keywords followed by a variable declaration |
| 320 | // This is different from the group above, because a { begins |
| 321 | // object destructuring, rather than a block |
| 322 | 'var' => self::TYPE_VAR, |
| 323 | 'let' => self::TYPE_VAR, |
| 324 | 'const' => self::TYPE_VAR, |
| 325 | |
| 326 | // ECMAScript 6.0 § 14.1 Function Definitions |
| 327 | 'function' => self::TYPE_FUNC, |
| 328 | // ECMAScript 6.0 § 14.2 Arrow Function Definitions |
| 329 | '=>' => self::TYPE_ARROW, |
| 330 | |
| 331 | // Class declaration or expression: |
| 332 | // class Identifier { ClassBody } |
| 333 | // class { ClassBody } |
| 334 | // class Identifier extends Expression { ClassBody } |
| 335 | // class extends Expression { ClassBody } |
| 336 | 'class' => self::TYPE_CLASS, |
| 337 | |
| 338 | // ECMAScript 6.0 § 12.3 Left-Hand-Side Expressions (MemberExpression) |
| 339 | // A dot can also be part of a DecimalLiteral, but in that case we handle the entire |
| 340 | // DecimalLiteral as one token. A separate '.' token is always part of a MemberExpression. |
| 341 | '.' => self::TYPE_DOT, |
| 342 | |
| 343 | // Can be one of: |
| 344 | // - Block (ECMAScript 6.0 § 13.2 Block) |
| 345 | // - ObjectLiteral (ECMAScript 6.0 § 12.2 Primary Expression) |
| 346 | '{' => self::TYPE_BRACE_OPEN, |
| 347 | '}' => self::TYPE_BRACE_CLOSE, |
| 348 | |
| 349 | // Can be one of: |
| 350 | // - Parenthesised Identifier or Expression after a |
| 351 | // TYPE_IF or TYPE_FUNC keyword. |
| 352 | // - PrimaryExpression (ECMAScript 6.0 § 12.2 Primary Expression) |
| 353 | // - CallExpression (ECMAScript 6.0 § 12.3 Left-Hand-Side Expressions) |
| 354 | // - Beginning of an ArrowFunction (ECMAScript 6.0 § 14.2 Arrow Function Definitions) |
| 355 | '(' => self::TYPE_PAREN_OPEN, |
| 356 | ')' => self::TYPE_PAREN_CLOSE, |
| 357 | |
| 358 | // Can be one of: |
| 359 | // - ArrayLiteral (ECMAScript 6.0 § 12.2 Primary Expressions) |
| 360 | // - ComputedPropertyName (ECMAScript 6.0 § 12.2.6 Object Initializer) |
| 361 | '[' => self::TYPE_PAREN_OPEN, |
| 362 | ']' => self::TYPE_PAREN_CLOSE, |
| 363 | |
| 364 | // Can be one of: |
| 365 | // - End of any statement |
| 366 | // - EmptyStatement (ECMAScript 6.0 § 13.4 Empty Statement) |
| 367 | ';' => self::TYPE_SEMICOLON, |
| 368 | |
| 369 | // ECMAScript 8.0 § 14.6 Async Function Definitions |
| 370 | // async [no LineTerminator here] function ... |
| 371 | // async [no LineTerminator here] propertyName() ... |
| 372 | 'async' => self::TYPE_ASYNC, |
| 373 | ]; |
| 374 | |
| 375 | /** |
| 376 | * @var array $model |
| 377 | * |
| 378 | * The main table for the state machine. Defines the desired action for every state/token pair. |
| 379 | * |
| 380 | * The state pushed onto the stack by ACTION_PUSH will be returned to by ACTION_POP. |
| 381 | * A state/token pair may not specify both ACTION_POP and ACTION_GOTO. If that does happen, |
| 382 | * ACTION_POP takes precedence. |
| 383 | * |
| 384 | * This table is augmented by self::ensureExpandedStates(). |
| 385 | */ |
| 386 | private static $model = [ |
| 387 | // Statement - This is the initial state. |
| 388 | self::STATEMENT => [ |
| 389 | self::TYPE_UN_OP => [ |
| 390 | self::ACTION_GOTO => self::EXPRESSION, |
| 391 | ], |
| 392 | self::TYPE_INCR_OP => [ |
| 393 | self::ACTION_GOTO => self::EXPRESSION, |
| 394 | ], |
| 395 | self::TYPE_ADD_OP => [ |
| 396 | self::ACTION_GOTO => self::EXPRESSION, |
| 397 | ], |
| 398 | self::TYPE_BRACE_OPEN => [ |
| 399 | // Use of '{' in statement context, creates a Block. |
| 400 | self::ACTION_PUSH => self::STATEMENT, |
| 401 | ], |
| 402 | self::TYPE_BRACE_CLOSE => [ |
| 403 | // Ends a Block |
| 404 | self::ACTION_POP => true, |
| 405 | ], |
| 406 | self::TYPE_PAREN_OPEN => [ |
| 407 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 408 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 409 | ], |
| 410 | self::TYPE_RETURN => [ |
| 411 | self::ACTION_GOTO => self::EXPRESSION_NO_NL, |
| 412 | ], |
| 413 | self::TYPE_IF => [ |
| 414 | self::ACTION_GOTO => self::CONDITION, |
| 415 | ], |
| 416 | self::TYPE_VAR => [ |
| 417 | self::ACTION_GOTO => self::EXPRESSION, |
| 418 | ], |
| 419 | self::TYPE_FUNC => [ |
| 420 | self::ACTION_PUSH => self::STATEMENT, |
| 421 | self::ACTION_GOTO => self::FUNC, |
| 422 | ], |
| 423 | self::TYPE_CLASS => [ |
| 424 | self::ACTION_PUSH => self::STATEMENT, |
| 425 | self::ACTION_GOTO => self::CLASS_DEF, |
| 426 | ], |
| 427 | self::TYPE_SPECIAL => [ |
| 428 | 'import' => [ |
| 429 | self::ACTION_GOTO => self::IMPORT_EXPORT, |
| 430 | ], |
| 431 | 'export' => [ |
| 432 | self::ACTION_GOTO => self::IMPORT_EXPORT, |
| 433 | ], |
| 434 | ], |
| 435 | self::TYPE_LITERAL => [ |
| 436 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 437 | ], |
| 438 | self::TYPE_ASYNC => [ |
| 439 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 440 | ], |
| 441 | self::TYPE_AWAIT => [ |
| 442 | self::ACTION_GOTO => self::EXPRESSION, |
| 443 | ], |
| 444 | ], |
| 445 | // The state after if/catch/while/for/switch/with |
| 446 | // Waits for an expression in parentheses, then goes to STATEMENT |
| 447 | self::CONDITION => [ |
| 448 | self::TYPE_PAREN_OPEN => [ |
| 449 | self::ACTION_PUSH => self::STATEMENT, |
| 450 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 451 | ], |
| 452 | ], |
| 453 | // The state after the function keyword. Waits for {, then goes to STATEMENT. |
| 454 | // The function body's closing } will pop the stack, so the state to return to |
| 455 | // after the function should be pushed to the stack first |
| 456 | self::FUNC => [ |
| 457 | // Needed to prevent * in an expression in the argument list from improperly |
| 458 | // triggering GENFUNC |
| 459 | self::TYPE_PAREN_OPEN => [ |
| 460 | self::ACTION_PUSH => self::FUNC, |
| 461 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 462 | ], |
| 463 | self::TYPE_BRACE_OPEN => [ |
| 464 | self::ACTION_GOTO => self::STATEMENT, |
| 465 | ], |
| 466 | self::TYPE_SPECIAL => [ |
| 467 | '*' => [ |
| 468 | self::ACTION_GOTO => self::GENFUNC, |
| 469 | ], |
| 470 | ], |
| 471 | ], |
| 472 | // After function*. Waits for { , then goes to a generator function statement. |
| 473 | self::GENFUNC => [ |
| 474 | self::TYPE_BRACE_OPEN => [ |
| 475 | // Note negative value: generator function states are negative |
| 476 | self::ACTION_GOTO => -self::STATEMENT |
| 477 | ], |
| 478 | ], |
| 479 | // Property assignment - This is an object literal declaration. |
| 480 | // For example: `{ key: value, key2, [computedKey3]: value3, method4() { ... } }` |
| 481 | self::PROPERTY_ASSIGNMENT => [ |
| 482 | // Note that keywords like if, class, var, delete, instanceof etc. can be used as keys, |
| 483 | // and should be treated as literals here, as they are in EXPRESSION_DOT. In this state, |
| 484 | // that is implicitly true because TYPE_LITERAL has no action, so it stays in this state. |
| 485 | // If we later add a state transition for TYPE_LITERAL, that same transition should |
| 486 | // also be applied to TYPE_RETURN, TYPE_IF, TYPE_DO, TYPE_VAR, TYPE_FUNC and TYPE_CLASS. |
| 487 | self::TYPE_COLON => [ |
| 488 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 489 | ], |
| 490 | // For {, which begins a method |
| 491 | self::TYPE_BRACE_OPEN => [ |
| 492 | self::ACTION_PUSH => self::PROPERTY_ASSIGNMENT, |
| 493 | // This is not flipped, see "Special cases" below |
| 494 | self::ACTION_GOTO => self::STATEMENT, |
| 495 | ], |
| 496 | self::TYPE_BRACE_CLOSE => [ |
| 497 | self::ACTION_POP => true, |
| 498 | ], |
| 499 | // For [, which begins a computed key |
| 500 | self::TYPE_PAREN_OPEN => [ |
| 501 | self::ACTION_PUSH => self::PROPERTY_ASSIGNMENT, |
| 502 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 503 | ], |
| 504 | self::TYPE_SPECIAL => [ |
| 505 | '*' => [ |
| 506 | self::ACTION_PUSH => self::PROPERTY_ASSIGNMENT, |
| 507 | self::ACTION_GOTO => self::GENFUNC, |
| 508 | ], |
| 509 | ], |
| 510 | ], |
| 511 | // Place in an expression where we expect an operand or a unary operator: the start |
| 512 | // of an expression or after an operator. Note that unary operators (including INCR_OP |
| 513 | // and ADD_OP) cause us to stay in this state, while operands take us to EXPRESSION_OP |
| 514 | self::EXPRESSION => [ |
| 515 | self::TYPE_SEMICOLON => [ |
| 516 | self::ACTION_GOTO => self::STATEMENT, |
| 517 | ], |
| 518 | self::TYPE_BRACE_OPEN => [ |
| 519 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 520 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 521 | ], |
| 522 | self::TYPE_BRACE_CLOSE => [ |
| 523 | self::ACTION_POP => true, |
| 524 | ], |
| 525 | self::TYPE_PAREN_OPEN => [ |
| 526 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 527 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 528 | ], |
| 529 | self::TYPE_FUNC => [ |
| 530 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 531 | self::ACTION_GOTO => self::FUNC, |
| 532 | ], |
| 533 | self::TYPE_CLASS => [ |
| 534 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 535 | self::ACTION_GOTO => self::CLASS_DEF, |
| 536 | ], |
| 537 | self::TYPE_LITERAL => [ |
| 538 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 539 | ], |
| 540 | self::TYPE_ASYNC => [ |
| 541 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 542 | ], |
| 543 | ], |
| 544 | // An expression immediately after return/throw/break/continue, where a newline |
| 545 | // is not allowed. This state is identical to EXPRESSION, except that semicolon |
| 546 | // insertion can happen here, and we never stay here: in cases where EXPRESSION would |
| 547 | // do nothing, we go to EXPRESSION. |
| 548 | self::EXPRESSION_NO_NL => [ |
| 549 | self::TYPE_UN_OP => [ |
| 550 | self::ACTION_GOTO => self::EXPRESSION, |
| 551 | ], |
| 552 | self::TYPE_INCR_OP => [ |
| 553 | self::ACTION_GOTO => self::EXPRESSION, |
| 554 | ], |
| 555 | // BIN_OP seems impossible at the start of an expression, but it can happen in |
| 556 | // yield *foo |
| 557 | self::TYPE_BIN_OP => [ |
| 558 | self::ACTION_GOTO => self::EXPRESSION, |
| 559 | ], |
| 560 | self::TYPE_ADD_OP => [ |
| 561 | self::ACTION_GOTO => self::EXPRESSION, |
| 562 | ], |
| 563 | self::TYPE_SEMICOLON => [ |
| 564 | self::ACTION_GOTO => self::STATEMENT, |
| 565 | ], |
| 566 | self::TYPE_BRACE_OPEN => [ |
| 567 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 568 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 569 | ], |
| 570 | self::TYPE_BRACE_CLOSE => [ |
| 571 | self::ACTION_POP => true, |
| 572 | ], |
| 573 | self::TYPE_PAREN_OPEN => [ |
| 574 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 575 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 576 | ], |
| 577 | self::TYPE_FUNC => [ |
| 578 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 579 | self::ACTION_GOTO => self::FUNC, |
| 580 | ], |
| 581 | self::TYPE_CLASS => [ |
| 582 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 583 | self::ACTION_GOTO => self::CLASS_DEF, |
| 584 | ], |
| 585 | self::TYPE_LITERAL => [ |
| 586 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 587 | ], |
| 588 | self::TYPE_ASYNC => [ |
| 589 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 590 | ], |
| 591 | self::TYPE_AWAIT => [ |
| 592 | self::ACTION_GOTO => self::EXPRESSION, |
| 593 | ], |
| 594 | ], |
| 595 | // Place in an expression after an operand, where we expect an operator |
| 596 | self::EXPRESSION_OP => [ |
| 597 | self::TYPE_BIN_OP => [ |
| 598 | self::ACTION_GOTO => self::EXPRESSION, |
| 599 | ], |
| 600 | self::TYPE_ADD_OP => [ |
| 601 | self::ACTION_GOTO => self::EXPRESSION, |
| 602 | ], |
| 603 | self::TYPE_DOT => [ |
| 604 | self::ACTION_GOTO => self::EXPRESSION_DOT, |
| 605 | ], |
| 606 | self::TYPE_HOOK => [ |
| 607 | self::ACTION_PUSH => self::EXPRESSION, |
| 608 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 609 | ], |
| 610 | self::TYPE_COLON => [ |
| 611 | self::ACTION_GOTO => self::STATEMENT, |
| 612 | ], |
| 613 | self::TYPE_COMMA => [ |
| 614 | self::ACTION_GOTO => self::EXPRESSION, |
| 615 | ], |
| 616 | self::TYPE_SEMICOLON => [ |
| 617 | self::ACTION_GOTO => self::STATEMENT, |
| 618 | ], |
| 619 | self::TYPE_ARROW => [ |
| 620 | self::ACTION_GOTO => self::EXPRESSION_ARROWFUNC, |
| 621 | ], |
| 622 | self::TYPE_PAREN_OPEN => [ |
| 623 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 624 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 625 | ], |
| 626 | self::TYPE_BRACE_CLOSE => [ |
| 627 | self::ACTION_POP => true, |
| 628 | ], |
| 629 | self::TYPE_FUNC => [ |
| 630 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 631 | self::ACTION_GOTO => self::FUNC, |
| 632 | ], |
| 633 | ], |
| 634 | // State after a dot (.). Like EXPRESSION, except that many keywords behave like literals |
| 635 | // (e.g. class, if, else, var, function) because they're not valid as identifiers but are |
| 636 | // valid as property names. |
| 637 | self::EXPRESSION_DOT => [ |
| 638 | self::TYPE_LITERAL => [ |
| 639 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 640 | ], |
| 641 | // The following are keywords behaving as literals |
| 642 | self::TYPE_RETURN => [ |
| 643 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 644 | ], |
| 645 | self::TYPE_IF => [ |
| 646 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 647 | ], |
| 648 | self::TYPE_DO => [ |
| 649 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 650 | ], |
| 651 | self::TYPE_VAR => [ |
| 652 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 653 | ], |
| 654 | self::TYPE_FUNC => [ |
| 655 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 656 | ], |
| 657 | self::TYPE_CLASS => [ |
| 658 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 659 | ], |
| 660 | // We don't expect real unary/binary operators here, but some keywords |
| 661 | // (new, delete, void, typeof, instanceof, in) are classified as such, and they can be |
| 662 | // used as property names |
| 663 | self::TYPE_UN_OP => [ |
| 664 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 665 | ], |
| 666 | self::TYPE_BIN_OP => [ |
| 667 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 668 | ], |
| 669 | ], |
| 670 | // State after the } closing an arrow function body: like STATEMENT except |
| 671 | // that it has semicolon insertion, COMMA can continue the expression, and after |
| 672 | // a function we go to STATEMENT instead of EXPRESSION_OP |
| 673 | self::EXPRESSION_END => [ |
| 674 | self::TYPE_UN_OP => [ |
| 675 | self::ACTION_GOTO => self::EXPRESSION, |
| 676 | ], |
| 677 | self::TYPE_INCR_OP => [ |
| 678 | self::ACTION_GOTO => self::EXPRESSION, |
| 679 | ], |
| 680 | self::TYPE_ADD_OP => [ |
| 681 | self::ACTION_GOTO => self::EXPRESSION, |
| 682 | ], |
| 683 | self::TYPE_COMMA => [ |
| 684 | self::ACTION_GOTO => self::EXPRESSION, |
| 685 | ], |
| 686 | self::TYPE_SEMICOLON => [ |
| 687 | self::ACTION_GOTO => self::STATEMENT, |
| 688 | ], |
| 689 | self::TYPE_BRACE_OPEN => [ |
| 690 | self::ACTION_PUSH => self::STATEMENT, |
| 691 | self::ACTION_GOTO => self::STATEMENT, |
| 692 | ], |
| 693 | self::TYPE_BRACE_CLOSE => [ |
| 694 | self::ACTION_POP => true, |
| 695 | ], |
| 696 | self::TYPE_PAREN_OPEN => [ |
| 697 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 698 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 699 | ], |
| 700 | self::TYPE_RETURN => [ |
| 701 | self::ACTION_GOTO => self::EXPRESSION_NO_NL, |
| 702 | ], |
| 703 | self::TYPE_IF => [ |
| 704 | self::ACTION_GOTO => self::CONDITION, |
| 705 | ], |
| 706 | self::TYPE_VAR => [ |
| 707 | self::ACTION_GOTO => self::EXPRESSION, |
| 708 | ], |
| 709 | self::TYPE_FUNC => [ |
| 710 | self::ACTION_PUSH => self::STATEMENT, |
| 711 | self::ACTION_GOTO => self::FUNC, |
| 712 | ], |
| 713 | self::TYPE_CLASS => [ |
| 714 | self::ACTION_PUSH => self::STATEMENT, |
| 715 | self::ACTION_GOTO => self::CLASS_DEF, |
| 716 | ], |
| 717 | self::TYPE_LITERAL => [ |
| 718 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 719 | ], |
| 720 | self::TYPE_ASYNC => [ |
| 721 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 722 | ], |
| 723 | ], |
| 724 | // State after =>. Like EXPRESSION, except that { begins an arrow function body |
| 725 | // rather than an object literal. |
| 726 | self::EXPRESSION_ARROWFUNC => [ |
| 727 | self::TYPE_UN_OP => [ |
| 728 | self::ACTION_GOTO => self::EXPRESSION, |
| 729 | ], |
| 730 | self::TYPE_INCR_OP => [ |
| 731 | self::ACTION_GOTO => self::EXPRESSION, |
| 732 | ], |
| 733 | self::TYPE_ADD_OP => [ |
| 734 | self::ACTION_GOTO => self::EXPRESSION, |
| 735 | ], |
| 736 | self::TYPE_BRACE_OPEN => [ |
| 737 | self::ACTION_PUSH => self::EXPRESSION_END, |
| 738 | self::ACTION_GOTO => self::STATEMENT, |
| 739 | ], |
| 740 | self::TYPE_PAREN_OPEN => [ |
| 741 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 742 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 743 | ], |
| 744 | self::TYPE_FUNC => [ |
| 745 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 746 | self::ACTION_GOTO => self::FUNC, |
| 747 | ], |
| 748 | self::TYPE_CLASS => [ |
| 749 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 750 | self::ACTION_GOTO => self::CLASS_DEF, |
| 751 | ], |
| 752 | self::TYPE_LITERAL => [ |
| 753 | self::ACTION_GOTO => self::EXPRESSION_OP, |
| 754 | ], |
| 755 | ], |
| 756 | // Expression after a ? . This differs from EXPRESSION because a : ends the ternary |
| 757 | // rather than starting STATEMENT (outside a ternary, : comes after a goto label) |
| 758 | // The actual rule for : ending the ternary is in EXPRESSION_TERNARY_OP. |
| 759 | self::EXPRESSION_TERNARY => [ |
| 760 | self::TYPE_BRACE_OPEN => [ |
| 761 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 762 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 763 | ], |
| 764 | self::TYPE_PAREN_OPEN => [ |
| 765 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 766 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 767 | ], |
| 768 | self::TYPE_FUNC => [ |
| 769 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 770 | self::ACTION_GOTO => self::FUNC, |
| 771 | ], |
| 772 | self::TYPE_CLASS => [ |
| 773 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 774 | self::ACTION_GOTO => self::CLASS_DEF, |
| 775 | ], |
| 776 | self::TYPE_LITERAL => [ |
| 777 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 778 | ], |
| 779 | ], |
| 780 | // Like EXPRESSION_OP, but for ternaries, see EXPRESSION_TERNARY |
| 781 | self::EXPRESSION_TERNARY_OP => [ |
| 782 | self::TYPE_BIN_OP => [ |
| 783 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 784 | ], |
| 785 | self::TYPE_ADD_OP => [ |
| 786 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 787 | ], |
| 788 | self::TYPE_DOT => [ |
| 789 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_DOT, |
| 790 | ], |
| 791 | self::TYPE_HOOK => [ |
| 792 | self::ACTION_PUSH => self::EXPRESSION_TERNARY, |
| 793 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 794 | ], |
| 795 | self::TYPE_COMMA => [ |
| 796 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 797 | ], |
| 798 | self::TYPE_ARROW => [ |
| 799 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_ARROWFUNC, |
| 800 | ], |
| 801 | self::TYPE_PAREN_OPEN => [ |
| 802 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 803 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 804 | ], |
| 805 | self::TYPE_COLON => [ |
| 806 | self::ACTION_POP => true, |
| 807 | ], |
| 808 | ], |
| 809 | // Like EXPRESSION_DOT, but for ternaries, see EXPRESSION_TERNARY |
| 810 | self::EXPRESSION_TERNARY_DOT => [ |
| 811 | self::TYPE_LITERAL => [ |
| 812 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 813 | ], |
| 814 | // The following are keywords behaving as literals |
| 815 | self::TYPE_RETURN => [ |
| 816 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 817 | ], |
| 818 | self::TYPE_IF => [ |
| 819 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 820 | ], |
| 821 | self::TYPE_DO => [ |
| 822 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 823 | ], |
| 824 | self::TYPE_VAR => [ |
| 825 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 826 | ], |
| 827 | self::TYPE_FUNC => [ |
| 828 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 829 | ], |
| 830 | self::TYPE_CLASS => [ |
| 831 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 832 | ], |
| 833 | // We don't expect real unary/binary operators here, but some keywords |
| 834 | // (new, delete, void, typeof, instanceof, in) are classified as such, and they can be |
| 835 | // used as property names |
| 836 | self::TYPE_UN_OP => [ |
| 837 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 838 | ], |
| 839 | self::TYPE_BIN_OP => [ |
| 840 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 841 | ], |
| 842 | ], |
| 843 | // Like EXPRESSION_ARROWFUNC, but for ternaries, see EXPRESSION_TERNARY |
| 844 | self::EXPRESSION_TERNARY_ARROWFUNC => [ |
| 845 | self::TYPE_UN_OP => [ |
| 846 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 847 | ], |
| 848 | self::TYPE_INCR_OP => [ |
| 849 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 850 | ], |
| 851 | self::TYPE_ADD_OP => [ |
| 852 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 853 | ], |
| 854 | self::TYPE_BRACE_OPEN => [ |
| 855 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 856 | self::ACTION_GOTO => self::STATEMENT, |
| 857 | ], |
| 858 | self::TYPE_PAREN_OPEN => [ |
| 859 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 860 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 861 | ], |
| 862 | self::TYPE_FUNC => [ |
| 863 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 864 | self::ACTION_GOTO => self::FUNC, |
| 865 | ], |
| 866 | self::TYPE_CLASS => [ |
| 867 | self::ACTION_PUSH => self::EXPRESSION_TERNARY_OP, |
| 868 | self::ACTION_GOTO => self::CLASS_DEF, |
| 869 | ], |
| 870 | self::TYPE_LITERAL => [ |
| 871 | self::ACTION_GOTO => self::EXPRESSION_TERNARY_OP, |
| 872 | ], |
| 873 | ], |
| 874 | // Expression inside parentheses. Like EXPRESSION, except that ) ends this state |
| 875 | // This differs from EXPRESSION because semicolon insertion can't happen here |
| 876 | self::PAREN_EXPRESSION => [ |
| 877 | self::TYPE_BRACE_OPEN => [ |
| 878 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 879 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 880 | ], |
| 881 | self::TYPE_PAREN_OPEN => [ |
| 882 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 883 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 884 | ], |
| 885 | self::TYPE_PAREN_CLOSE => [ |
| 886 | self::ACTION_POP => true, |
| 887 | ], |
| 888 | self::TYPE_FUNC => [ |
| 889 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 890 | self::ACTION_GOTO => self::FUNC, |
| 891 | ], |
| 892 | self::TYPE_CLASS => [ |
| 893 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 894 | self::ACTION_GOTO => self::CLASS_DEF, |
| 895 | ], |
| 896 | self::TYPE_LITERAL => [ |
| 897 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 898 | ], |
| 899 | self::TYPE_ASYNC => [ |
| 900 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP_NO_NL, |
| 901 | ], |
| 902 | ], |
| 903 | // Like EXPRESSION_OP, but in parentheses, see PAREN_EXPRESSION |
| 904 | self::PAREN_EXPRESSION_OP => [ |
| 905 | self::TYPE_BIN_OP => [ |
| 906 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 907 | ], |
| 908 | self::TYPE_ADD_OP => [ |
| 909 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 910 | ], |
| 911 | self::TYPE_DOT => [ |
| 912 | self::ACTION_GOTO => self::PAREN_EXPRESSION_DOT, |
| 913 | ], |
| 914 | self::TYPE_HOOK => [ |
| 915 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 916 | ], |
| 917 | self::TYPE_COLON => [ |
| 918 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 919 | ], |
| 920 | self::TYPE_COMMA => [ |
| 921 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 922 | ], |
| 923 | self::TYPE_SEMICOLON => [ |
| 924 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 925 | ], |
| 926 | self::TYPE_ARROW => [ |
| 927 | self::ACTION_GOTO => self::PAREN_EXPRESSION_ARROWFUNC, |
| 928 | ], |
| 929 | self::TYPE_PAREN_OPEN => [ |
| 930 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 931 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 932 | ], |
| 933 | self::TYPE_PAREN_CLOSE => [ |
| 934 | self::ACTION_POP => true, |
| 935 | ], |
| 936 | ], |
| 937 | // Like EXPRESSION_DOT, but in parentheses, see PAREN_EXPRESSION |
| 938 | self::PAREN_EXPRESSION_DOT => [ |
| 939 | self::TYPE_LITERAL => [ |
| 940 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 941 | ], |
| 942 | // The following are keywords behaving as literals |
| 943 | self::TYPE_RETURN => [ |
| 944 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 945 | ], |
| 946 | self::TYPE_IF => [ |
| 947 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 948 | ], |
| 949 | self::TYPE_DO => [ |
| 950 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 951 | ], |
| 952 | self::TYPE_VAR => [ |
| 953 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 954 | ], |
| 955 | self::TYPE_FUNC => [ |
| 956 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 957 | ], |
| 958 | self::TYPE_CLASS => [ |
| 959 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 960 | ], |
| 961 | // We don't expect real unary/binary operators here, but some keywords |
| 962 | // (new, delete, void, typeof, instanceof, in) are classified as such, and they can be |
| 963 | // used as property names |
| 964 | self::TYPE_UN_OP => [ |
| 965 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 966 | ], |
| 967 | self::TYPE_BIN_OP => [ |
| 968 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 969 | ], |
| 970 | ], |
| 971 | // Like EXPRESSION_ARROWFUNC, but in parentheses, see PAREN_EXPRESSION |
| 972 | self::PAREN_EXPRESSION_ARROWFUNC => [ |
| 973 | self::TYPE_UN_OP => [ |
| 974 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 975 | ], |
| 976 | self::TYPE_INCR_OP => [ |
| 977 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 978 | ], |
| 979 | self::TYPE_ADD_OP => [ |
| 980 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 981 | ], |
| 982 | self::TYPE_BRACE_OPEN => [ |
| 983 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 984 | self::ACTION_GOTO => self::STATEMENT, |
| 985 | ], |
| 986 | self::TYPE_PAREN_OPEN => [ |
| 987 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 988 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 989 | ], |
| 990 | self::TYPE_FUNC => [ |
| 991 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 992 | self::ACTION_GOTO => self::FUNC, |
| 993 | ], |
| 994 | self::TYPE_CLASS => [ |
| 995 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 996 | self::ACTION_GOTO => self::CLASS_DEF, |
| 997 | ], |
| 998 | self::TYPE_LITERAL => [ |
| 999 | self::ACTION_GOTO => self::PAREN_EXPRESSION_OP, |
| 1000 | ], |
| 1001 | ], |
| 1002 | |
| 1003 | // Like PAREN_EXPRESSION_OP, for the state after "async" in a PAREN_EXPRESSION, |
| 1004 | // for use by the $semicolon model. |
| 1005 | self::PAREN_EXPRESSION_OP_NO_NL => [ |
| 1006 | self::TYPE_BIN_OP => [ |
| 1007 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1008 | ], |
| 1009 | self::TYPE_ADD_OP => [ |
| 1010 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1011 | ], |
| 1012 | self::TYPE_DOT => [ |
| 1013 | self::ACTION_GOTO => self::PAREN_EXPRESSION_DOT, |
| 1014 | ], |
| 1015 | self::TYPE_HOOK => [ |
| 1016 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1017 | ], |
| 1018 | self::TYPE_COLON => [ |
| 1019 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1020 | ], |
| 1021 | self::TYPE_COMMA => [ |
| 1022 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1023 | ], |
| 1024 | self::TYPE_SEMICOLON => [ |
| 1025 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1026 | ], |
| 1027 | self::TYPE_ARROW => [ |
| 1028 | self::ACTION_GOTO => self::PAREN_EXPRESSION_ARROWFUNC, |
| 1029 | ], |
| 1030 | self::TYPE_PAREN_OPEN => [ |
| 1031 | self::ACTION_PUSH => self::PAREN_EXPRESSION_OP, |
| 1032 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1033 | ], |
| 1034 | self::TYPE_PAREN_CLOSE => [ |
| 1035 | self::ACTION_POP => true, |
| 1036 | ], |
| 1037 | ], |
| 1038 | // Expression as the value of a key in an object literal. Like EXPRESSION, except that |
| 1039 | // a comma (in PROPERTY_EXPRESSION_OP) goes to PROPERTY_ASSIGNMENT instead |
| 1040 | self::PROPERTY_EXPRESSION => [ |
| 1041 | self::TYPE_BRACE_OPEN => [ |
| 1042 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1043 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 1044 | ], |
| 1045 | self::TYPE_BRACE_CLOSE => [ |
| 1046 | self::ACTION_POP => true, |
| 1047 | ], |
| 1048 | self::TYPE_PAREN_OPEN => [ |
| 1049 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1050 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1051 | ], |
| 1052 | self::TYPE_FUNC => [ |
| 1053 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1054 | self::ACTION_GOTO => self::FUNC, |
| 1055 | ], |
| 1056 | self::TYPE_CLASS => [ |
| 1057 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1058 | self::ACTION_GOTO => self::CLASS_DEF, |
| 1059 | ], |
| 1060 | self::TYPE_LITERAL => [ |
| 1061 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1062 | ], |
| 1063 | ], |
| 1064 | // Like EXPRESSION_OP, but in a property expression, see PROPERTY_EXPRESSION |
| 1065 | self::PROPERTY_EXPRESSION_OP => [ |
| 1066 | self::TYPE_BIN_OP => [ |
| 1067 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 1068 | ], |
| 1069 | self::TYPE_ADD_OP => [ |
| 1070 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 1071 | ], |
| 1072 | self::TYPE_DOT => [ |
| 1073 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_DOT, |
| 1074 | ], |
| 1075 | self::TYPE_HOOK => [ |
| 1076 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION, |
| 1077 | self::ACTION_GOTO => self::EXPRESSION_TERNARY, |
| 1078 | ], |
| 1079 | self::TYPE_COMMA => [ |
| 1080 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 1081 | ], |
| 1082 | self::TYPE_ARROW => [ |
| 1083 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_ARROWFUNC, |
| 1084 | ], |
| 1085 | self::TYPE_BRACE_OPEN => [ |
| 1086 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1087 | ], |
| 1088 | self::TYPE_BRACE_CLOSE => [ |
| 1089 | self::ACTION_POP => true, |
| 1090 | ], |
| 1091 | self::TYPE_PAREN_OPEN => [ |
| 1092 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1093 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1094 | ], |
| 1095 | ], |
| 1096 | // Like EXPRESSION_DOT, but in a property expression, see PROPERTY_EXPRESSION |
| 1097 | self::PROPERTY_EXPRESSION_DOT => [ |
| 1098 | self::TYPE_LITERAL => [ |
| 1099 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1100 | ], |
| 1101 | // The following are keywords behaving as literals |
| 1102 | self::TYPE_RETURN => [ |
| 1103 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1104 | ], |
| 1105 | self::TYPE_IF => [ |
| 1106 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1107 | ], |
| 1108 | self::TYPE_DO => [ |
| 1109 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1110 | ], |
| 1111 | self::TYPE_VAR => [ |
| 1112 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1113 | ], |
| 1114 | self::TYPE_FUNC => [ |
| 1115 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1116 | ], |
| 1117 | self::TYPE_CLASS => [ |
| 1118 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1119 | ], |
| 1120 | // We don't expect real unary/binary operators here, but some keywords |
| 1121 | // (new, delete, void, typeof, instanceof, in) are classified as such, and they can be |
| 1122 | // used as property names |
| 1123 | self::TYPE_UN_OP => [ |
| 1124 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1125 | ], |
| 1126 | self::TYPE_BIN_OP => [ |
| 1127 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1128 | ], |
| 1129 | ], |
| 1130 | // Like EXPRESSION_ARROWFUNC, but in a property expression, see PROPERTY_EXPRESSION |
| 1131 | self::PROPERTY_EXPRESSION_ARROWFUNC => [ |
| 1132 | self::TYPE_UN_OP => [ |
| 1133 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 1134 | ], |
| 1135 | self::TYPE_INCR_OP => [ |
| 1136 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 1137 | ], |
| 1138 | self::TYPE_ADD_OP => [ |
| 1139 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION, |
| 1140 | ], |
| 1141 | self::TYPE_BRACE_OPEN => [ |
| 1142 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1143 | self::ACTION_GOTO => self::STATEMENT, |
| 1144 | ], |
| 1145 | self::TYPE_PAREN_OPEN => [ |
| 1146 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1147 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1148 | ], |
| 1149 | self::TYPE_FUNC => [ |
| 1150 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1151 | self::ACTION_GOTO => self::FUNC, |
| 1152 | ], |
| 1153 | self::TYPE_CLASS => [ |
| 1154 | self::ACTION_PUSH => self::PROPERTY_EXPRESSION_OP, |
| 1155 | self::ACTION_GOTO => self::CLASS_DEF, |
| 1156 | ], |
| 1157 | self::TYPE_LITERAL => [ |
| 1158 | self::ACTION_GOTO => self::PROPERTY_EXPRESSION_OP, |
| 1159 | ], |
| 1160 | ], |
| 1161 | // Class definition (after the class keyword). Expects an identifier, or the extends |
| 1162 | // keyword followed by an expression (or both), followed by {, which starts an object |
| 1163 | // literal. The object literal's closing } will pop the stack, so the state to return |
| 1164 | // to after the class definition should be pushed to the stack first. |
| 1165 | self::CLASS_DEF => [ |
| 1166 | self::TYPE_BRACE_OPEN => [ |
| 1167 | self::ACTION_GOTO => self::PROPERTY_ASSIGNMENT, |
| 1168 | ], |
| 1169 | self::TYPE_PAREN_OPEN => [ |
| 1170 | self::ACTION_PUSH => self::CLASS_DEF, |
| 1171 | self::ACTION_GOTO => self::PAREN_EXPRESSION, |
| 1172 | ], |
| 1173 | self::TYPE_FUNC => [ |
| 1174 | self::ACTION_PUSH => self::CLASS_DEF, |
| 1175 | self::ACTION_GOTO => self::FUNC, |
| 1176 | ], |
| 1177 | ], |
| 1178 | // Import or export declaration |
| 1179 | self::IMPORT_EXPORT => [ |
| 1180 | self::TYPE_SEMICOLON => [ |
| 1181 | self::ACTION_GOTO => self::STATEMENT, |
| 1182 | ], |
| 1183 | self::TYPE_VAR => [ |
| 1184 | self::ACTION_GOTO => self::EXPRESSION, |
| 1185 | ], |
| 1186 | self::TYPE_FUNC => [ |
| 1187 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 1188 | self::ACTION_GOTO => self::FUNC, |
| 1189 | ], |
| 1190 | self::TYPE_CLASS => [ |
| 1191 | self::ACTION_PUSH => self::EXPRESSION_OP, |
| 1192 | self::ACTION_GOTO => self::CLASS_DEF, |
| 1193 | ], |
| 1194 | self::TYPE_SPECIAL => [ |
| 1195 | 'default' => [ |
| 1196 | self::ACTION_GOTO => self::EXPRESSION, |
| 1197 | ], |
| 1198 | // Stay in this state for *, as, from |
| 1199 | '*' => [], |
| 1200 | 'as' => [], |
| 1201 | 'from' => [], |
| 1202 | ], |
| 1203 | ], |
| 1204 | // Used in template string-specific code below |
| 1205 | self::TEMPLATE_STRING_HEAD => [ |
| 1206 | self::TYPE_LITERAL => [ |
| 1207 | self::ACTION_PUSH => self::TEMPLATE_STRING_TAIL, |
| 1208 | self::ACTION_GOTO => self::EXPRESSION, |
| 1209 | ], |
| 1210 | ], |
| 1211 | ]; |
| 1212 | |
| 1213 | /** |
| 1214 | * @var array $semicolon |
| 1215 | * |
| 1216 | * Rules for when semicolon insertion is appropriate. Semicolon insertion happens if we are |
| 1217 | * in one of these states, and encounter one of these tokens preceded by a newline. |
| 1218 | * |
| 1219 | * This array is augmented by ensureExpandedStates(). |
| 1220 | */ |
| 1221 | private static $semicolon = [ |
| 1222 | self::EXPRESSION_NO_NL => [ |
| 1223 | self::TYPE_UN_OP => true, |
| 1224 | // BIN_OP seems impossible at the start of an expression, but it can happen in |
| 1225 | // yield *foo |
| 1226 | self::TYPE_BIN_OP => true, |
| 1227 | self::TYPE_INCR_OP => true, |
| 1228 | self::TYPE_ADD_OP => true, |
| 1229 | self::TYPE_BRACE_OPEN => true, |
| 1230 | self::TYPE_PAREN_OPEN => true, |
| 1231 | self::TYPE_RETURN => true, |
| 1232 | self::TYPE_IF => true, |
| 1233 | self::TYPE_DO => true, |
| 1234 | self::TYPE_VAR => true, |
| 1235 | self::TYPE_FUNC => true, |
| 1236 | self::TYPE_CLASS => true, |
| 1237 | self::TYPE_LITERAL => true, |
| 1238 | self::TYPE_ASYNC => true, |
| 1239 | ], |
| 1240 | self::EXPRESSION_OP => [ |
| 1241 | self::TYPE_UN_OP => true, |
| 1242 | self::TYPE_INCR_OP => true, |
| 1243 | self::TYPE_BRACE_OPEN => true, |
| 1244 | self::TYPE_RETURN => true, |
| 1245 | self::TYPE_IF => true, |
| 1246 | self::TYPE_DO => true, |
| 1247 | self::TYPE_VAR => true, |
| 1248 | self::TYPE_FUNC => true, |
| 1249 | self::TYPE_CLASS => true, |
| 1250 | self::TYPE_LITERAL => true, |
| 1251 | self::TYPE_ASYNC => true, |
| 1252 | ], |
| 1253 | self::EXPRESSION_END => [ |
| 1254 | self::TYPE_UN_OP => true, |
| 1255 | self::TYPE_INCR_OP => true, |
| 1256 | self::TYPE_ADD_OP => true, |
| 1257 | self::TYPE_BRACE_OPEN => true, |
| 1258 | self::TYPE_PAREN_OPEN => true, |
| 1259 | self::TYPE_RETURN => true, |
| 1260 | self::TYPE_IF => true, |
| 1261 | self::TYPE_DO => true, |
| 1262 | self::TYPE_VAR => true, |
| 1263 | self::TYPE_FUNC => true, |
| 1264 | self::TYPE_CLASS => true, |
| 1265 | self::TYPE_LITERAL => true, |
| 1266 | self::TYPE_ASYNC => true, |
| 1267 | ], |
| 1268 | self::PAREN_EXPRESSION_OP_NO_NL => [ |
| 1269 | self::TYPE_FUNC => true, |
| 1270 | ] |
| 1271 | ]; |
| 1272 | |
| 1273 | /** |
| 1274 | * @var array $divStates |
| 1275 | * |
| 1276 | * States in which a / is a division operator. In all other states, it's the start of a regex. |
| 1277 | * |
| 1278 | * This array is augmented by self::ensureExpandedStates(). |
| 1279 | */ |
| 1280 | private static $divStates = [ |
| 1281 | self::EXPRESSION_OP => true, |
| 1282 | self::EXPRESSION_TERNARY_OP => true, |
| 1283 | self::PAREN_EXPRESSION_OP => true, |
| 1284 | self::PROPERTY_EXPRESSION_OP => true |
| 1285 | ]; |
| 1286 | |
| 1287 | /** |
| 1288 | * Add copies of all states but with negative numbers to self::$model (if not already present), |
| 1289 | * to represent generator function states. |
| 1290 | */ |
| 1291 | private static function ensureExpandedStates() { |
| 1292 | // Already done? |
| 1293 | if ( self::$expandedStates ) { |
| 1294 | return; |
| 1295 | } |
| 1296 | self::$expandedStates = true; |
| 1297 | |
| 1298 | // Add copies of all states (except FUNC and GENFUNC) with negative numbers. |
| 1299 | // These negative states represent states inside generator functions. When in these states, |
| 1300 | // TYPE_YIELD is treated as TYPE_RETURN, otherwise as TYPE_LITERAL |
| 1301 | foreach ( self::$model as $state => $transitions ) { |
| 1302 | if ( $state !== self::FUNC && $state !== self::GENFUNC ) { |
| 1303 | foreach ( $transitions as $tokenType => $actions ) { |
| 1304 | foreach ( $actions as $action => $target ) { |
| 1305 | if ( is_array( $target ) ) { |
| 1306 | foreach ( $target as $subaction => $subtarget ) { |
| 1307 | self::$model[-$state][$tokenType][$action][$subaction] = |
| 1308 | $subtarget === self::FUNC || $subtarget === true || $subtarget === self::GENFUNC |
| 1309 | ? $subtarget : -$subtarget; |
| 1310 | } |
| 1311 | } else { |
| 1312 | self::$model[-$state][$tokenType][$action] = |
| 1313 | $target === self::FUNC || $target === true || $target === self::GENFUNC |
| 1314 | ? $target : -$target; |
| 1315 | } |
| 1316 | } |
| 1317 | } |
| 1318 | } |
| 1319 | } |
| 1320 | // Special cases: |
| 1321 | // '{' in a property assignment starts a method, so it shouldn't be flipped |
| 1322 | self::$model[-self::PROPERTY_ASSIGNMENT][self::TYPE_BRACE_OPEN][self::ACTION_GOTO] = self::STATEMENT; |
| 1323 | |
| 1324 | // Also add negative versions of states to the other arrays |
| 1325 | foreach ( self::$semicolon as $state => $value ) { |
| 1326 | self::$semicolon[-$state] = $value; |
| 1327 | } |
| 1328 | foreach ( self::$divStates as $state => $value ) { |
| 1329 | self::$divStates[-$state] = $value; |
| 1330 | } |
| 1331 | } |
| 1332 | |
| 1333 | /** |
| 1334 | * Returns minified JavaScript code. |
| 1335 | * |
| 1336 | * @see MinifierState::setErrorHandler |
| 1337 | * @param string $s JavaScript code to minify |
| 1338 | * @param callable|null $onError Called with a ParserError object |
| 1339 | * @return string Minified code |
| 1340 | */ |
| 1341 | public static function minify( $s, $onError = null ) { |
| 1342 | return self::minifyInternal( $s, null, $onError ); |
| 1343 | } |
| 1344 | |
| 1345 | /** |
| 1346 | * Create a minifier state object without source map capabilities |
| 1347 | * |
| 1348 | * Example: |
| 1349 | * |
| 1350 | * JavaScriptMinifier::createMinifier() |
| 1351 | * ->addSourceFile( 'file.js', $source ) |
| 1352 | * ->getMinifiedOutput(); |
| 1353 | * |
| 1354 | * @return JavaScriptMinifierState |
| 1355 | */ |
| 1356 | public static function createMinifier() { |
| 1357 | return new JavaScriptMinifierState; |
| 1358 | } |
| 1359 | |
| 1360 | /** |
| 1361 | * Create a minifier state object with source map capabilities |
| 1362 | * |
| 1363 | * Example: |
| 1364 | * |
| 1365 | * $mapper = JavaScriptMinifier::createSourceMapState() |
| 1366 | * ->addSourceFile( 'file1.js', $source1 ) |
| 1367 | * ->addOutput( "\n\n" ) |
| 1368 | * ->addSourceFile( 'file2.js', $source2 ); |
| 1369 | * $out = $mapper->getMinifiedOutput(); |
| 1370 | * $map = $mapper->getSourceMap() |
| 1371 | * |
| 1372 | * @return JavaScriptMapperState |
| 1373 | */ |
| 1374 | public static function createSourceMapState() { |
| 1375 | return new JavaScriptMapperState; |
| 1376 | } |
| 1377 | |
| 1378 | /** |
| 1379 | * Create a MinifierState that doesn't actually minify |
| 1380 | * |
| 1381 | * @return IdentityMinifierState |
| 1382 | */ |
| 1383 | public static function createIdentityMinifier() { |
| 1384 | return new IdentityMinifierState; |
| 1385 | } |
| 1386 | |
| 1387 | /** |
| 1388 | * Minify with optional source map. |
| 1389 | * |
| 1390 | * @internal |
| 1391 | * |
| 1392 | * @param string $s |
| 1393 | * @param MappingsGenerator|null $mapGenerator |
| 1394 | * @param callable|null $onError |
| 1395 | * @return string |
| 1396 | */ |
| 1397 | public static function minifyInternal( $s, $mapGenerator = null, $onError = null ) { |
| 1398 | self::ensureExpandedStates(); |
| 1399 | |
| 1400 | // Here's where the minifying takes place: Loop through the input, looking for tokens |
| 1401 | // and output them to $out, taking actions to the above defined rules when appropriate. |
| 1402 | $error = null; |
| 1403 | $out = ''; |
| 1404 | $pos = 0; |
| 1405 | $length = strlen( $s ); |
| 1406 | $lineLength = 0; |
| 1407 | $dotlessNum = false; |
| 1408 | $lastDotlessNum = false; |
| 1409 | $newlineFound = true; |
| 1410 | $state = self::STATEMENT; |
| 1411 | $stack = []; |
| 1412 | $topOfStack = null; // Optimization: calling end( $stack ) repeatedly is expensive |
| 1413 | $last = ';'; // Pretend that we have seen a semicolon yet |
| 1414 | while ( $pos < $length ) { |
| 1415 | // First, skip over any whitespace and multiline comments, recording whether we |
| 1416 | // found any newline character |
| 1417 | $skip = strspn( $s, " \t\n\r\xb\xc", $pos ); |
| 1418 | if ( !$skip ) { |
| 1419 | $ch = $s[$pos]; |
| 1420 | if ( $ch === '/' && substr( $s, $pos, 2 ) === '/*' ) { |
| 1421 | // Multiline comment. Search for the end token or EOT. |
| 1422 | $end = strpos( $s, '*/', $pos + 2 ); |
| 1423 | $skip = $end === false ? $length - $pos : $end - $pos + 2; |
| 1424 | } |
| 1425 | } |
| 1426 | if ( $skip ) { |
| 1427 | // The semicolon insertion mechanism needs to know whether there was a newline |
| 1428 | // between two tokens, so record it now. |
| 1429 | if ( !$newlineFound && strcspn( $s, "\r\n", $pos, $skip ) !== $skip ) { |
| 1430 | $newlineFound = true; |
| 1431 | } |
| 1432 | if ( $mapGenerator ) { |
| 1433 | $mapGenerator->consumeSource( $skip ); |
| 1434 | } |
| 1435 | $pos += $skip; |
| 1436 | continue; |
| 1437 | } |
| 1438 | // Handle C++-style comments and html comments, which are treated as single line |
| 1439 | // comments by the browser, regardless of whether the end tag is on the same line. |
| 1440 | // Handle --> the same way, but only if it's at the beginning of the line |
| 1441 | // @phan-suppress-next-line PhanPossiblyUndeclaredVariable |
| 1442 | if ( ( $ch === '/' && substr( $s, $pos, 2 ) === '//' ) |
| 1443 | || ( $ch === '<' && substr( $s, $pos, 4 ) === '<!--' ) |
| 1444 | || ( $ch === '-' && $newlineFound && substr( $s, $pos, 3 ) === '-->' ) |
| 1445 | ) { |
| 1446 | $skip = strcspn( $s, "\r\n", $pos ); |
| 1447 | if ( $mapGenerator ) { |
| 1448 | $mapGenerator->consumeSource( $skip ); |
| 1449 | } |
| 1450 | $pos += $skip; |
| 1451 | continue; |
| 1452 | } |
| 1453 | |
| 1454 | // Find out which kind of token we're handling. |
| 1455 | // Note: $end must point past the end of the current token |
| 1456 | // so that `substr($s, $pos, $end - $pos)` would be the entire token. |
| 1457 | // In order words, $end will be the offset of the last relevant character |
| 1458 | // in the stream + 1, or simply put: The offset of the first character |
| 1459 | // of any next token in the stream. |
| 1460 | $end = $pos + 1; |
| 1461 | // Handle string literals |
| 1462 | if ( $ch === "'" || $ch === '"' ) { |
| 1463 | // Search to the end of the string literal, skipping over backslash escapes |
| 1464 | $search = $ch . '\\'; |
| 1465 | do { |
| 1466 | // Speculatively add 2 to the end so that if we see a backslash, |
| 1467 | // the next iteration will start 2 characters further (one for the |
| 1468 | // backslash, one for the escaped character). |
| 1469 | // We'll correct this outside the loop. |
| 1470 | $end += strcspn( $s, $search, $end ) + 2; |
| 1471 | // If the last character in our search for a quote or a backlash |
| 1472 | // matched a backslash and we haven't reached the end, keep searching.. |
| 1473 | } while ( $end - 2 < $length && $s[$end - 2] === '\\' ); |
| 1474 | // Correction (1): Undo speculative add, keep only one (end of string literal) |
| 1475 | $end--; |
| 1476 | if ( $end > $length ) { |
| 1477 | // Correction (2): Loop wrongly assumed an end quote ended the search, |
| 1478 | // but search ended because we've reached the end. Correct $end. |
| 1479 | // TODO: This is invalid and should throw. |
| 1480 | $end--; |
| 1481 | } |
| 1482 | |
| 1483 | // Handle template strings, either from "`" to begin a new string, |
| 1484 | // or continuation after the "}" that ends a "${"-expression. |
| 1485 | } elseif ( $ch === '`' || ( $ch === '}' && $topOfStack === self::TEMPLATE_STRING_TAIL ) ) { |
| 1486 | if ( $ch === '}' ) { |
| 1487 | // Pop the TEMPLATE_STRING_TAIL state off the stack |
| 1488 | // We don't let it get popped off the stack the normal way, to avoid the newline |
| 1489 | // and comment stripping code above running on the continuation of the literal |
| 1490 | array_pop( $stack ); |
| 1491 | // Also pop the previous state off the stack |
| 1492 | $state = array_pop( $stack ); |
| 1493 | $topOfStack = end( $stack ); |
| 1494 | } |
| 1495 | // Search until we reach either a closing ` or a ${, skipping over backslash escapes |
| 1496 | // and $ characters followed by something other than { or ` |
| 1497 | do { |
| 1498 | $end += strcspn( $s, '`$\\', $end ) + 1; |
| 1499 | if ( $end - 1 < $length && $s[$end - 1] === '`' ) { |
| 1500 | // End of the string, stop |
| 1501 | // We don't do this in the while() condition because the $end++ in the |
| 1502 | // backslash escape branch makes it difficult to do so without incorrectly |
| 1503 | // considering an escaped backtick (\`) the end of the string |
| 1504 | break; |
| 1505 | } |
| 1506 | if ( $end - 1 < $length && $s[$end - 1] === '\\' ) { |
| 1507 | // Backslash escape. Skip the next character, and keep going |
| 1508 | $end++; |
| 1509 | continue; |
| 1510 | } |
| 1511 | if ( $end < $length && $s[$end - 1] === '$' && $s[$end] === '{' ) { |
| 1512 | // Beginning of an expression in ${ ... }. Skip the {, and stop |
| 1513 | $end++; |
| 1514 | // Push the current state to the stack. We'll pop this off later when hitting |
| 1515 | // the end of this template string |
| 1516 | $stack[] = $state; |
| 1517 | $topOfStack = $state; |
| 1518 | // Change the state to TEMPLATE_STRING_HEAD. The token type will be detected |
| 1519 | // as TYPE_LITERAL, and this will cause the state machine to expect an |
| 1520 | // expression, then go to the TEMPLATE_STRING_TAIL state when it hits the } |
| 1521 | $state = self::TEMPLATE_STRING_HEAD; |
| 1522 | break; |
| 1523 | } |
| 1524 | } while ( $end - 1 < $length ); |
| 1525 | if ( $end > $length ) { |
| 1526 | // Loop wrongly assumed an end quote or ${ ended the search, |
| 1527 | // but search ended because we've reached the end. Correct $end. |
| 1528 | // TODO: This is invalid and should throw. |
| 1529 | $end--; |
| 1530 | } |
| 1531 | |
| 1532 | // We have to distinguish between regexp literals and division operators |
| 1533 | // A division operator is only possible in certain states |
| 1534 | } elseif ( $ch === '/' && !isset( self::$divStates[$state] ) ) { |
| 1535 | // Regexp literal |
| 1536 | for ( ; ; ) { |
| 1537 | // Search until we find "/" (end of regexp), "\" (backslash escapes), |
| 1538 | // or "[" (start of character classes). |
| 1539 | do { |
| 1540 | // Speculatively add 2 to ensure next iteration skips |
| 1541 | // over backslash and escaped character. |
| 1542 | // We'll correct this outside the loop. |
| 1543 | $end += strcspn( $s, '/[\\', $end ) + 2; |
| 1544 | // If backslash escape, keep searching... |
| 1545 | } while ( $end - 2 < $length && $s[$end - 2] === '\\' ); |
| 1546 | // Correction (1): Undo speculative add, keep only one (end of regexp) |
| 1547 | $end--; |
| 1548 | if ( $end > $length ) { |
| 1549 | // Correction (2): Loop wrongly assumed end slash was seen |
| 1550 | // String ended without end of regexp. Correct $end. |
| 1551 | // TODO: This is invalid and should throw. |
| 1552 | $end--; |
| 1553 | break; |
| 1554 | } |
| 1555 | if ( $s[$end - 1] === '/' ) { |
| 1556 | break; |
| 1557 | } |
| 1558 | // (Implicit else), we must've found the start of a char class, |
| 1559 | // skip until we find "]" (end of char class), or "\" (backslash escape) |
| 1560 | do { |
| 1561 | // Speculatively add 2 for backslash escape. |
| 1562 | // We'll substract one outside the loop. |
| 1563 | $end += strcspn( $s, ']\\', $end ) + 2; |
| 1564 | // If backslash escape, keep searching... |
| 1565 | } while ( $end - 2 < $length && $s[$end - 2] === '\\' ); |
| 1566 | // Correction (1): Undo speculative add, keep only one (end of regexp) |
| 1567 | $end--; |
| 1568 | if ( $end > $length ) { |
| 1569 | // Correction (2): Loop wrongly assumed "]" was seen |
| 1570 | // String ended without ending char class or regexp. Correct $end. |
| 1571 | // TODO: This is invalid and should throw. |
| 1572 | $end--; |
| 1573 | break; |
| 1574 | } |
| 1575 | } |
| 1576 | // Search past the regexp modifiers (gi) |
| 1577 | while ( $end < $length && ctype_alpha( $s[$end] ) ) { |
| 1578 | $end++; |
| 1579 | } |
| 1580 | } elseif ( |
| 1581 | $ch === '0' |
| 1582 | && ( $pos + 1 < $length ) && ( $s[$pos + 1] === 'x' || $s[$pos + 1] === 'X' ) |
| 1583 | ) { |
| 1584 | // Hex numeric literal |
| 1585 | $end++; // x or X |
| 1586 | $len = strspn( $s, '0123456789ABCDEFabcdef', $end ); |
| 1587 | if ( !$len && !$error ) { |
| 1588 | $error = new ParseError( |
| 1589 | 'Expected a hexadecimal number but found ' . substr( $s, $pos, 5 ), |
| 1590 | $pos, |
| 1591 | ); |
| 1592 | } |
| 1593 | $end += $len; |
| 1594 | } elseif ( |
| 1595 | // Optimisation: This check must accept only ASCII digits 0-9. |
| 1596 | // Avoid ctype_digit() because it is slower and also accepts locale-specific digits. |
| 1597 | // Using is_numeric() might seem wrong also as it accepts negative numbers, decimal |
| 1598 | // numbers, and exponents (e.g. strings like "+012.34e6"). But, it is fine here |
| 1599 | // because we know $ch is a single character, and we believe the only single |
| 1600 | // characters that is_numeric() accepts are ASCII digits 0-9. |
| 1601 | is_numeric( $ch ) |
| 1602 | || ( $ch === '.' && $pos + 1 < $length && is_numeric( $s[$pos + 1] ) ) |
| 1603 | ) { |
| 1604 | $end += strspn( $s, '0123456789', $end ); |
| 1605 | $decimal = strspn( $s, '.', $end ); |
| 1606 | if ( $decimal ) { |
| 1607 | if ( $decimal > 2 && !$error ) { |
| 1608 | $error = new ParseError( 'Too many decimal points', $end ); |
| 1609 | } |
| 1610 | $end += strspn( $s, '0123456789', $end + 1 ) + $decimal; |
| 1611 | } else { |
| 1612 | $dotlessNum = true; |
| 1613 | } |
| 1614 | $exponent = strspn( $s, 'eE', $end ); |
| 1615 | if ( $exponent ) { |
| 1616 | if ( $exponent > 1 && !$error ) { |
| 1617 | $error = new ParseError( 'Number with several E', $end ); |
| 1618 | } |
| 1619 | $end += $exponent; |
| 1620 | |
| 1621 | // + sign is optional; - sign is required. |
| 1622 | $end += strspn( $s, '-+', $end ); |
| 1623 | $len = strspn( $s, '0123456789', $end ); |
| 1624 | if ( !$len && !$error ) { |
| 1625 | $error = new ParseError( |
| 1626 | 'Missing decimal digits after exponent', |
| 1627 | $pos |
| 1628 | ); |
| 1629 | } |
| 1630 | $end += $len; |
| 1631 | } |
| 1632 | } elseif ( isset( self::$opChars[$ch] ) ) { |
| 1633 | // Punctuation character. Search for the longest matching operator. |
| 1634 | for ( $tokenLength = self::LONGEST_PUNCTUATION_TOKEN; $tokenLength > 1; $tokenLength-- ) { |
| 1635 | if ( |
| 1636 | $pos + $tokenLength <= $length && |
| 1637 | isset( self::$tokenTypes[ substr( $s, $pos, $tokenLength ) ] ) |
| 1638 | ) { |
| 1639 | $end = $pos + $tokenLength; |
| 1640 | break; |
| 1641 | } |
| 1642 | } |
| 1643 | } else { |
| 1644 | // Identifier or reserved word. Search for the end by excluding whitespace and |
| 1645 | // punctuation. |
| 1646 | $end += strcspn( $s, " \t\n.;,=<>+-{}()[]?:*/%'\"`!&|^~\xb\xc\r", $end ); |
| 1647 | } |
| 1648 | |
| 1649 | // Now get the token type from our type array |
| 1650 | $token = substr( $s, $pos, $end - $pos ); // so $end - $pos == strlen( $token ) |
| 1651 | $type = isset( self::$model[$state][self::TYPE_SPECIAL][$token] ) |
| 1652 | ? self::TYPE_SPECIAL |
| 1653 | : self::$tokenTypes[$token] ?? self::TYPE_LITERAL; |
| 1654 | if ( $type === self::TYPE_YIELD ) { |
| 1655 | // yield is treated as TYPE_RETURN inside a generator function (negative state) |
| 1656 | // but as TYPE_LITERAL when not in a generator function (positive state) |
| 1657 | $type = $state < 0 ? self::TYPE_RETURN : self::TYPE_LITERAL; |
| 1658 | } |
| 1659 | |
| 1660 | $pad = ''; |
| 1661 | if ( $newlineFound && isset( self::$semicolon[$state][$type] ) ) { |
| 1662 | // This token triggers the semicolon insertion mechanism of javascript. While we |
| 1663 | // could add the ; token here ourselves, keeping the newline has a few advantages. |
| 1664 | $pad = "\n"; |
| 1665 | $state = $state < 0 ? -self::STATEMENT : self::STATEMENT; |
| 1666 | $lineLength = 0; |
| 1667 | } elseif ( $lineLength + $end - $pos > self::$maxLineLength && |
| 1668 | !isset( self::$semicolon[$state][$type] ) && |
| 1669 | $type !== self::TYPE_INCR_OP && |
| 1670 | $type !== self::TYPE_ARROW |
| 1671 | ) { |
| 1672 | // This line would get too long if we added $token, so add a newline first. |
| 1673 | // Only do this if it won't trigger semicolon insertion and if it won't |
| 1674 | // put a postfix increment operator or an arrow on its own line, |
| 1675 | // which is illegal in js. |
| 1676 | $pad = "\n"; |
| 1677 | $lineLength = 0; |
| 1678 | // Check, whether we have to separate the token from the last one with whitespace |
| 1679 | } elseif ( !isset( self::$opChars[$last] ) && !isset( self::$opChars[$ch] ) ) { |
| 1680 | $pad = ' '; |
| 1681 | $lineLength++; |
| 1682 | // Don't accidentally create ++, -- or // tokens |
| 1683 | } elseif ( $last === $ch && ( $ch === '+' || $ch === '-' || $ch === '/' ) ) { |
| 1684 | $pad = ' '; |
| 1685 | $lineLength++; |
| 1686 | // Don't create invalid dot notation after number literal (T303827). |
| 1687 | // Keep whitespace in "42. foo". |
| 1688 | // But keep minifying "foo.bar", "42..foo", and "42.0.foo" per $opChars. |
| 1689 | } elseif ( $lastDotlessNum && $type === self::TYPE_DOT ) { |
| 1690 | $pad = ' '; |
| 1691 | $lineLength++; |
| 1692 | } |
| 1693 | |
| 1694 | // self::debug( $topOfStack, $last, $state, $ch, $token, $type ); |
| 1695 | |
| 1696 | if ( $mapGenerator ) { |
| 1697 | $mapGenerator->outputSpace( $pad ); |
| 1698 | $mapGenerator->outputToken( $token ); |
| 1699 | $mapGenerator->consumeSource( $end - $pos ); |
| 1700 | } |
| 1701 | $out .= $pad; |
| 1702 | $out .= $token; |
| 1703 | $lineLength += $end - $pos; // += strlen( $token ) |
| 1704 | $last = $s[$end - 1]; |
| 1705 | $pos = $end; |
| 1706 | $newlineFound = false; |
| 1707 | $lastDotlessNum = $dotlessNum; |
| 1708 | $dotlessNum = false; |
| 1709 | |
| 1710 | // Now that we have output our token, transition into the new state. |
| 1711 | $actions = $type === self::TYPE_SPECIAL ? |
| 1712 | self::$model[$state][$type][$token] : |
| 1713 | self::$model[$state][$type] ?? []; |
| 1714 | if ( isset( $actions[self::ACTION_PUSH] ) && |
| 1715 | count( $stack ) < self::STACK_LIMIT |
| 1716 | ) { |
| 1717 | $topOfStack = $actions[self::ACTION_PUSH]; |
| 1718 | $stack[] = $topOfStack; |
| 1719 | } |
| 1720 | if ( $stack && isset( $actions[self::ACTION_POP] ) ) { |
| 1721 | $state = array_pop( $stack ); |
| 1722 | $topOfStack = end( $stack ); |
| 1723 | } elseif ( isset( $actions[self::ACTION_GOTO] ) ) { |
| 1724 | $state = $actions[self::ACTION_GOTO]; |
| 1725 | } |
| 1726 | } |
| 1727 | if ( $onError && $error ) { |
| 1728 | $onError( $error ); |
| 1729 | } |
| 1730 | return $out; |
| 1731 | } |
| 1732 | |
| 1733 | /** |
| 1734 | * @param null|false|int $top |
| 1735 | * @param string $last |
| 1736 | * @param int $state |
| 1737 | * @param string $ch |
| 1738 | * @param string $token |
| 1739 | * @param int $type |
| 1740 | */ |
| 1741 | private static function debug( |
| 1742 | $top, string $last, |
| 1743 | int $state, string $ch, string $token, int $type |
| 1744 | ) { |
| 1745 | static $first = true; |
| 1746 | $self = new \ReflectionClass( self::class ); |
| 1747 | $constants = $self->getConstants(); |
| 1748 | |
| 1749 | foreach ( $self->getConstants() as $name => $value ) { |
| 1750 | if ( $value === $top ) { |
| 1751 | $top = $name; |
| 1752 | } |
| 1753 | if ( $value === $state ) { |
| 1754 | $state = $name; |
| 1755 | } |
| 1756 | if ( $value === $type ) { |
| 1757 | $type = $name; |
| 1758 | } |
| 1759 | } |
| 1760 | |
| 1761 | if ( $first ) { |
| 1762 | print sprintf( "| %-29s | %-4s | %-29s | %-2s | %-10s | %-29s\n", |
| 1763 | 'topOfStack', 'last', 'state', 'ch', 'token', 'type' ); |
| 1764 | print sprintf( "| %'-29s | %'-4s | %'-29s | %'-2s | %'-10s | %'-29s\n", |
| 1765 | '', '', '', '', '', '' ); |
| 1766 | $first = false; |
| 1767 | } |
| 1768 | print sprintf( "| %-29s | %-4s | %-29s | %-2s | %-10s | %-29s\n", |
| 1769 | (string)$top, $last, $state, $ch, $token, $type ); |
| 1770 | } |
| 1771 | } |