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Developer Documentation
See Release Notes
Long Term Support Release
- Bug fixes for general core bugs in 3.9.x will end* 10 May 2021 (12 months).
- Bug fixes for security issues in 3.9.x will end* 8 May 2023 (36 months).
- PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
/lib/minify/matthiasmullie-minify/src/ -> JS.php (source)
Differences Between: [Versions 39 and 400] [Versions 39 and 401] [Versions 39 and 402] [Versions 39 and 403]
1 <?php 2 /** 3 * JavaScript minifier 4 * 5 * Please report bugs on https://github.com/matthiasmullie/minify/issues 6 * 7 * @author Matthias Mullie <minify@mullie.eu> 8 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved 9 * @license MIT License 10 */ 11 namespace MatthiasMullie\Minify; 12 13 /** 14 * JavaScript Minifier Class 15 * 16 * Please report bugs on https://github.com/matthiasmullie/minify/issues 17 * 18 * @package Minify 19 * @author Matthias Mullie <minify@mullie.eu> 20 * @author Tijs Verkoyen <minify@verkoyen.eu> 21 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved 22 * @license MIT License 23 */ 24 class JS extends Minify 25 { 26 /** 27 * Var-matching regex based on http://stackoverflow.com/a/9337047/802993. 28 * 29 * Note that regular expressions using that bit must have the PCRE_UTF8 30 * pattern modifier (/u) set. 31 * 32 * @var string 33 */ 34 const REGEX_VARIABLE = 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35 36 /** 37 * Full list of JavaScript reserved words. 38 * Will be loaded from /data/js/keywords_reserved.txt. 39 * 40 * @see https://mathiasbynens.be/notes/reserved-keywords 41 * 42 * @var string[] 43 */ 44 protected $keywordsReserved = array(); 45 46 /** 47 * List of JavaScript reserved words that accept a <variable, value, ...> 48 * after them. Some end of lines are not the end of a statement, like with 49 * these keywords. 50 * 51 * E.g.: we shouldn't insert a ; after this else 52 * else 53 * console.log('this is quite fine') 54 * 55 * Will be loaded from /data/js/keywords_before.txt 56 * 57 * @var string[] 58 */ 59 protected $keywordsBefore = array(); 60 61 /** 62 * List of JavaScript reserved words that accept a <variable, value, ...> 63 * before them. Some end of lines are not the end of a statement, like when 64 * continued by one of these keywords on the newline. 65 * 66 * E.g.: we shouldn't insert a ; before this instanceof 67 * variable 68 * instanceof String 69 * 70 * Will be loaded from /data/js/keywords_after.txt 71 * 72 * @var string[] 73 */ 74 protected $keywordsAfter = array(); 75 76 /** 77 * List of all JavaScript operators. 78 * 79 * Will be loaded from /data/js/operators.txt 80 * 81 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators 82 * 83 * @var string[] 84 */ 85 protected $operators = array(); 86 87 /** 88 * List of JavaScript operators that accept a <variable, value, ...> after 89 * them. Some end of lines are not the end of a statement, like with these 90 * operators. 91 * 92 * Note: Most operators are fine, we've only removed ++ and --. 93 * ++ & -- have to be joined with the value they're in-/decrementing. 94 * 95 * Will be loaded from /data/js/operators_before.txt 96 * 97 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators 98 * 99 * @var string[] 100 */ 101 protected $operatorsBefore = array(); 102 103 /** 104 * List of JavaScript operators that accept a <variable, value, ...> before 105 * them. Some end of lines are not the end of a statement, like when 106 * continued by one of these operators on the newline. 107 * 108 * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. 109 * There can't be a newline separating ! or ~ and whatever it is negating. 110 * ++ & -- have to be joined with the value they're in-/decrementing. 111 * ) & ] are "special" in that they have lots or usecases. () for example 112 * is used for function calls, for grouping, in if () and for (), ... 113 * 114 * Will be loaded from /data/js/operators_after.txt 115 * 116 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators 117 * 118 * @var string[] 119 */ 120 protected $operatorsAfter = array(); 121 122 /** 123 * {@inheritdoc} 124 */ 125 public function __construct() 126 { 127 call_user_func_array(array('parent', '__construct'), func_get_args()); 128 129 $dataDir = __DIR__.'/../data/js/'; 130 $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; 131 $this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options); 132 $this->keywordsBefore = file($dataDir.'keywords_before.txt', $options); 133 $this->keywordsAfter = file($dataDir.'keywords_after.txt', $options); 134 $this->operators = file($dataDir.'operators.txt', $options); 135 $this->operatorsBefore = file($dataDir.'operators_before.txt', $options); 136 $this->operatorsAfter = file($dataDir.'operators_after.txt', $options); 137 } 138 139 /** 140 * Minify the data. 141 * Perform JS optimizations. 142 * 143 * @param string[optional] $path Path to write the data to 144 * 145 * @return string The minified data 146 */ 147 public function execute($path = null) 148 { 149 $content = ''; 150 151 /* 152 * Let's first take out strings, comments and regular expressions. 153 * All of these can contain JS code-like characters, and we should make 154 * sure any further magic ignores anything inside of these. 155 * 156 * Consider this example, where we should not strip any whitespace: 157 * var str = "a test"; 158 * 159 * Comments will be removed altogether, strings and regular expressions 160 * will be replaced by placeholder text, which we'll restore later. 161 */ 162 $this->extractStrings('\'"`'); 163 $this->stripComments(); 164 $this->extractRegex(); 165 166 // loop files 167 foreach ($this->data as $source => $js) { 168 // take out strings, comments & regex (for which we've registered 169 // the regexes just a few lines earlier) 170 $js = $this->replace($js); 171 172 $js = $this->propertyNotation($js); 173 $js = $this->shortenBools($js); 174 $js = $this->stripWhitespace($js); 175 176 // combine js: separating the scripts by a ; 177 $content .= $js.";"; 178 } 179 180 // clean up leftover `;`s from the combination of multiple scripts 181 $content = ltrim($content, ';'); 182 $content = (string) substr($content, 0, -1); 183 184 /* 185 * Earlier, we extracted strings & regular expressions and replaced them 186 * with placeholder text. This will restore them. 187 */ 188 $content = $this->restoreExtractedData($content); 189 190 return $content; 191 } 192 193 /** 194 * Strip comments from source code. 195 */ 196 protected function stripComments() 197 { 198 // PHP only supports $this inside anonymous functions since 5.4 199 $minifier = $this; 200 $callback = function ($match) use ($minifier) { 201 $count = count($minifier->extracted); 202 $placeholder = '/*'.$count.'*/'; 203 $minifier->extracted[$placeholder] = $match[0]; 204 205 return $placeholder; 206 }; 207 // multi-line comments 208 $this->registerPattern('/\n?\/\*(!|.*?@license|.*?@preserve).*?\*\/\n?/s', $callback); 209 $this->registerPattern('/\/\*.*?\*\//s', ''); 210 211 // single-line comments 212 $this->registerPattern('/\/\/.*$/m', ''); 213 } 214 215 /** 216 * JS can have /-delimited regular expressions, like: /ab+c/.match(string). 217 * 218 * The content inside the regex can contain characters that may be confused 219 * for JS code: e.g. it could contain whitespace it needs to match & we 220 * don't want to strip whitespace in there. 221 * 222 * The regex can be pretty simple: we don't have to care about comments, 223 * (which also use slashes) because stripComments() will have stripped those 224 * already. 225 * 226 * This method will replace all string content with simple REGEX# 227 * placeholder text, so we've rid all regular expressions from characters 228 * that may be misinterpreted. Original regex content will be saved in 229 * $this->extracted and after doing all other minifying, we can restore the 230 * original content via restoreRegex() 231 */ 232 protected function extractRegex() 233 { 234 // PHP only supports $this inside anonymous functions since 5.4 235 $minifier = $this; 236 $callback = function ($match) use ($minifier) { 237 $count = count($minifier->extracted); 238 $placeholder = '"'.$count.'"'; 239 $minifier->extracted[$placeholder] = $match[0]; 240 241 return $placeholder; 242 }; 243 244 // match all chars except `/` and `\` 245 // `\` is allowed though, along with whatever char follows (which is the 246 // one being escaped) 247 // this should allow all chars, except for an unescaped `/` (= the one 248 // closing the regex) 249 // then also ignore bare `/` inside `[]`, where they don't need to be 250 // escaped: anything inside `[]` can be ignored safely 251 $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; 252 253 // a regular expression can only be followed by a few operators or some 254 // of the RegExp methods (a `\` followed by a variable or value is 255 // likely part of a division, not a regex) 256 $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); 257 $before = '([=:,;\+\-\*\/\}\(\{\[&\|!]|^|'.implode('|', $keywords).')\s*'; 258 $propertiesAndMethods = array( 259 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 260 'constructor', 261 'flags', 262 'global', 263 'ignoreCase', 264 'multiline', 265 'source', 266 'sticky', 267 'unicode', 268 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 269 'compile(', 270 'exec(', 271 'test(', 272 'toSource(', 273 'toString(', 274 ); 275 $delimiters = array_fill(0, count($propertiesAndMethods), '/'); 276 $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); 277 $after = '(?=\s*([\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))'; 278 $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); 279 280 // regular expressions following a `)` are rather annoying to detect... 281 // quite often, `/` after `)` is a division operator & if it happens to 282 // be followed by another one (or a comment), it is likely to be 283 // confused for a regular expression 284 // however, it's perfectly possible for a regex to follow a `)`: after 285 // a single-line `if()`, `while()`, ... statement, for example 286 // since, when they occur like that, they're always the start of a 287 // statement, there's only a limited amount of ways they can be useful: 288 // by calling the regex methods directly 289 // if a regex following `)` is not followed by `.<property or method>`, 290 // it's quite likely not a regex 291 $before = '\)\s*'; 292 $after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))'; 293 $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); 294 295 // 1 more edge case: a regex can be followed by a lot more operators or 296 // keywords if there's a newline (ASI) in between, where the operator 297 // actually starts a new statement 298 // (https://github.com/matthiasmullie/minify/issues/56) 299 $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); 300 $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); 301 $after = '(?=\s*\n\s*('.implode('|', $operators).'))'; 302 $this->registerPattern('/'.$pattern.$after.'/', $callback); 303 } 304 305 /** 306 * Strip whitespace. 307 * 308 * We won't strip *all* whitespace, but as much as possible. The thing that 309 * we'll preserve are newlines we're unsure about. 310 * JavaScript doesn't require statements to be terminated with a semicolon. 311 * It will automatically fix missing semicolons with ASI (automatic semi- 312 * colon insertion) at the end of line causing errors (without semicolon.) 313 * 314 * Because it's sometimes hard to tell if a newline is part of a statement 315 * that should be terminated or not, we'll just leave some of them alone. 316 * 317 * @param string $content The content to strip the whitespace for 318 * 319 * @return string 320 */ 321 protected function stripWhitespace($content) 322 { 323 // uniform line endings, make them all line feed 324 $content = str_replace(array("\r\n", "\r"), "\n", $content); 325 326 // collapse all non-line feed whitespace into a single space 327 $content = preg_replace('/[^\S\n]+/', ' ', $content); 328 329 // strip leading & trailing whitespace 330 $content = str_replace(array(" \n", "\n "), "\n", $content); 331 332 // collapse consecutive line feeds into just 1 333 $content = preg_replace('/\n+/', "\n", $content); 334 335 $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); 336 $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); 337 $operators = $this->getOperatorsForRegex($this->operators, '/'); 338 $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); 339 $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); 340 341 // strip whitespace that ends in (or next line begin with) an operator 342 // that allows statements to be broken up over multiple lines 343 unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); 344 $content = preg_replace( 345 array( 346 '/('.implode('|', $operatorsBefore).')\s+/', 347 '/\s+('.implode('|', $operatorsAfter).')/', 348 ), 349 '\\1', 350 $content 351 ); 352 353 // make sure + and - can't be mistaken for, or joined into ++ and -- 354 $content = preg_replace( 355 array( 356 '/(?<![\+\-])\s*([\+\-])(?![\+\-])/', 357 '/(?<![\+\-])([\+\-])\s*(?![\+\-])/', 358 ), 359 '\\1', 360 $content 361 ); 362 363 // collapse whitespace around reserved words into single space 364 $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content); 365 $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content); 366 367 /* 368 * We didn't strip whitespace after a couple of operators because they 369 * could be used in different contexts and we can't be sure it's ok to 370 * strip the newlines. However, we can safely strip any non-line feed 371 * whitespace that follows them. 372 */ 373 $operatorsDiffBefore = array_diff($operators, $operatorsBefore); 374 $operatorsDiffAfter = array_diff($operators, $operatorsAfter); 375 $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content); 376 $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content); 377 378 /* 379 * Whitespace after `return` can be omitted in a few occasions 380 * (such as when followed by a string or regex) 381 * Same for whitespace in between `)` and `{`, or between `{` and some 382 * keywords. 383 */ 384 $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); 385 $content = preg_replace('/\)\s+\{/', '){', $content); 386 $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); 387 388 /* 389 * Get rid of double semicolons, except where they can be used like: 390 * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". 391 * I'll safeguard these double semicolons inside for-loops by 392 * temporarily replacing them with an invalid condition: they won't have 393 * a double semicolon and will be easy to spot to restore afterwards. 394 */ 395 $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); 396 $content = preg_replace('/;+/', ';', $content); 397 $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); 398 399 /* 400 * Next, we'll be removing all semicolons where ASI kicks in. 401 * for-loops however, can have an empty body (ending in only a 402 * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);` 403 * Here, nothing happens during the loop; it's just used to keep 404 * increasing `i`. With that ; omitted, the next line would be expected 405 * to be the for-loop's body... Same goes for while loops. 406 * I'm going to double that semicolon (if any) so after the next line, 407 * which strips semicolons here & there, we're still left with this one. 408 */ 409 $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content); 410 $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); 411 /* 412 * Below will also keep `;` after a `do{}while();` along with `while();` 413 * While these could be stripped after do-while, detecting this 414 * distinction is cumbersome, so I'll play it safe and make sure `;` 415 * after any kind of `while` is kept. 416 */ 417 $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); 418 419 /* 420 * We also can't strip empty else-statements. Even though they're 421 * useless and probably shouldn't be in the code in the first place, we 422 * shouldn't be stripping the `;` that follows it as it breaks the code. 423 * We can just remove those useless else-statements completely. 424 * 425 * @see https://github.com/matthiasmullie/minify/issues/91 426 */ 427 $content = preg_replace('/else;/s', '', $content); 428 429 /* 430 * We also don't really want to terminate statements followed by closing 431 * curly braces (which we've ignored completely up until now) or end-of- 432 * script: ASI will kick in here & we're all about minifying. 433 * Semicolons at beginning of the file don't make any sense either. 434 */ 435 $content = preg_replace('/;(\}|$)/s', '\\1', $content); 436 $content = ltrim($content, ';'); 437 438 // get rid of remaining whitespace af beginning/end 439 return trim($content); 440 } 441 442 /** 443 * We'll strip whitespace around certain operators with regular expressions. 444 * This will prepare the given array by escaping all characters. 445 * 446 * @param string[] $operators 447 * @param string $delimiter 448 * 449 * @return string[] 450 */ 451 protected function getOperatorsForRegex(array $operators, $delimiter = '/') 452 { 453 // escape operators for use in regex 454 $delimiters = array_fill(0, count($operators), $delimiter); 455 $escaped = array_map('preg_quote', $operators, $delimiters); 456 457 $operators = array_combine($operators, $escaped); 458 459 // ignore + & - for now, they'll get special treatment 460 unset($operators['+'], $operators['-']); 461 462 // dot can not just immediately follow a number; it can be confused for 463 // decimal point, or calling a method on it, e.g. 42 .toString() 464 $operators['.'] = '(?<![0-9]\s)\.'; 465 466 // don't confuse = with other assignment shortcuts (e.g. +=) 467 $chars = preg_quote('+-*\=<>%&|', $delimiter); 468 $operators['='] = '(?<!['.$chars.'])\='; 469 470 return $operators; 471 } 472 473 /** 474 * We'll strip whitespace around certain keywords with regular expressions. 475 * This will prepare the given array by escaping all characters. 476 * 477 * @param string[] $keywords 478 * @param string $delimiter 479 * 480 * @return string[] 481 */ 482 protected function getKeywordsForRegex(array $keywords, $delimiter = '/') 483 { 484 // escape keywords for use in regex 485 $delimiter = array_fill(0, count($keywords), $delimiter); 486 $escaped = array_map('preg_quote', $keywords, $delimiter); 487 488 // add word boundaries 489 array_walk($keywords, function ($value) { 490 return '\b'.$value.'\b'; 491 }); 492 493 $keywords = array_combine($keywords, $escaped); 494 495 return $keywords; 496 } 497 498 /** 499 * Replaces all occurrences of array['key'] by array.key. 500 * 501 * @param string $content 502 * 503 * @return string 504 */ 505 protected function propertyNotation($content) 506 { 507 // PHP only supports $this inside anonymous functions since 5.4 508 $minifier = $this; 509 $keywords = $this->keywordsReserved; 510 $callback = function ($match) use ($minifier, $keywords) { 511 $property = trim($minifier->extracted[$match[1]], '\'"'); 512 513 /* 514 * Check if the property is a reserved keyword. In this context (as 515 * property of an object literal/array) it shouldn't matter, but IE8 516 * freaks out with "Expected identifier". 517 */ 518 if (in_array($property, $keywords)) { 519 return $match[0]; 520 } 521 522 /* 523 * See if the property is in a variable-like format (e.g. 524 * array['key-here'] can't be replaced by array.key-here since '-' 525 * is not a valid character there. 526 */ 527 if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) { 528 return $match[0]; 529 } 530 531 return '.'.$property; 532 }; 533 534 /* 535 * Figure out if previous character is a variable name (of the array 536 * we want to use property notation on) - this is to make sure 537 * standalone ['value'] arrays aren't confused for keys-of-an-array. 538 * We can (and only have to) check the last character, because PHP's 539 * regex implementation doesn't allow unfixed-length look-behind 540 * assertions. 541 */ 542 preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); 543 $previousChar = $previousChar[1]; 544 545 /* 546 * Make sure word preceding the ['value'] is not a keyword, e.g. 547 * return['x']. Because -again- PHP's regex implementation doesn't allow 548 * unfixed-length look-behind assertions, I'm just going to do a lot of 549 * separate look-behind assertions, one for each keyword. 550 */ 551 $keywords = $this->getKeywordsForRegex($keywords); 552 $keywords = '(?<!'.implode(')(?<!', $keywords).')'; 553 554 return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); 555 } 556 557 /** 558 * Replaces true & false by !0 and !1. 559 * 560 * @param string $content 561 * 562 * @return string 563 */ 564 protected function shortenBools($content) 565 { 566 /* 567 * 'true' or 'false' could be used as property names (which may be 568 * followed by whitespace) - we must not replace those! 569 * Since PHP doesn't allow variable-length (to account for the 570 * whitespace) lookbehind assertions, I need to capture the leading 571 * character and check if it's a `.` 572 */ 573 $callback = function ($match) { 574 if (trim($match[1]) === '.') { 575 return $match[0]; 576 } 577 578 return $match[1].($match[2] === 'true' ? '!0' : '!1'); 579 }; 580 $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); 581 582 // for(;;) is exactly the same as while(true), but shorter :) 583 $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); 584 585 // now make sure we didn't turn any do ... while(true) into do ... for(;;) 586 preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); 587 588 // go backward to make sure positional offsets aren't altered when $content changes 589 $dos = array_reverse($dos); 590 foreach ($dos as $do) { 591 $offsetDo = $do[0][1]; 592 593 // find all `while` (now `for`) following `do`: one of those must be 594 // associated with the `do` and be turned back into `while` 595 preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); 596 foreach ($whiles as $while) { 597 $offsetWhile = $while[0][1]; 598 599 $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); 600 $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); 601 if ($open === $close) { 602 // only restore `while` if amount of `{` and `}` are the same; 603 // otherwise, that `for` isn't associated with this `do` 604 $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); 605 break; 606 } 607 } 608 } 609 610 return $content; 611 } 612 }
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