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Developer Documentation

See Release Notes
Long Term Support Release

  • Bug fixes for general core bugs in 4.1.x will end 13 November 2023 (12 months).
  • Bug fixes for security issues in 4.1.x will end 10 November 2025 (36 months).
  • PHP version: minimum PHP 7.4.0 Note: minimum PHP version has increased since Moodle 4.0. PHP 8.0.x is supported too.

Differences Between: [Versions 310 and 401] [Versions 311 and 401] [Versions 39 and 401] [Versions 400 and 401] [Versions 401 and 402] [Versions 401 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 ($minifier) {
 201              if (
 202                  substr($match[2], 0, 1) === '!' ||
 203                  strpos($match[2], '@license') !== false ||
 204                  strpos($match[2], '@preserve') !== false
 205              ) {
 206                  // preserve multi-line comments that start with /*!
 207                  // or contain @license or @preserve annotations
 208                  $count = count($minifier->extracted);
 209                  $placeholder = '/*'.$count.'*/';
 210                  $minifier->extracted[$placeholder] = $match[0];
 211  
 212                  return $match[1] . $placeholder . $match[3];
 213              }
 214  
 215              return $match[1] . $match[3];
 216          };
 217  
 218          // multi-line comments
 219          $this->registerPattern('/(\n?)\/\*(.*?)\*\/(\n?)/s', $callback);
 220  
 221          // single-line comments
 222          $this->registerPattern('/\/\/.*$/m', '');
 223      }
 224  
 225      /**
 226       * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
 227       *
 228       * The content inside the regex can contain characters that may be confused
 229       * for JS code: e.g. it could contain whitespace it needs to match & we
 230       * don't want to strip whitespace in there.
 231       *
 232       * The regex can be pretty simple: we don't have to care about comments,
 233       * (which also use slashes) because stripComments() will have stripped those
 234       * already.
 235       *
 236       * This method will replace all string content with simple REGEX#
 237       * placeholder text, so we've rid all regular expressions from characters
 238       * that may be misinterpreted. Original regex content will be saved in
 239       * $this->extracted and after doing all other minifying, we can restore the
 240       * original content via restoreRegex()
 241       */
 242      protected function extractRegex()
 243      {
 244          // PHP only supports $this inside anonymous functions since 5.4
 245          $minifier = $this;
 246          $callback = function ($match) use ($minifier) {
 247              $count = count($minifier->extracted);
 248              $placeholder = '"'.$count.'"';
 249              $minifier->extracted[$placeholder] = $match[0];
 250  
 251              return $placeholder;
 252          };
 253  
 254          // match all chars except `/` and `\`
 255          // `\` is allowed though, along with whatever char follows (which is the
 256          // one being escaped)
 257          // this should allow all chars, except for an unescaped `/` (= the one
 258          // closing the regex)
 259          // then also ignore bare `/` inside `[]`, where they don't need to be
 260          // escaped: anything inside `[]` can be ignored safely
 261          $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*';
 262  
 263          // a regular expression can only be followed by a few operators or some
 264          // of the RegExp methods (a `\` followed by a variable or value is
 265          // likely part of a division, not a regex)
 266          $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return',  'typeof');
 267          $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|'.implode('|', $keywords).')\s*';
 268          $propertiesAndMethods = array(
 269              // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
 270              'constructor',
 271              'flags',
 272              'global',
 273              'ignoreCase',
 274              'multiline',
 275              'source',
 276              'sticky',
 277              'unicode',
 278              // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
 279              'compile(',
 280              'exec(',
 281              'test(',
 282              'toSource(',
 283              'toString(',
 284          );
 285          $delimiters = array_fill(0, count($propertiesAndMethods), '/');
 286          $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
 287          $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))';
 288          $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
 289  
 290          // regular expressions following a `)` are rather annoying to detect...
 291          // quite often, `/` after `)` is a division operator & if it happens to
 292          // be followed by another one (or a comment), it is likely to be
 293          // confused for a regular expression
 294          // however, it's perfectly possible for a regex to follow a `)`: after
 295          // a single-line `if()`, `while()`, ... statement, for example
 296          // since, when they occur like that, they're always the start of a
 297          // statement, there's only a limited amount of ways they can be useful:
 298          // by calling the regex methods directly
 299          // if a regex following `)` is not followed by `.<property or method>`,
 300          // it's quite likely not a regex
 301          $before = '\)\s*';
 302          $after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))';
 303          $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
 304  
 305          // 1 more edge case: a regex can be followed by a lot more operators or
 306          // keywords if there's a newline (ASI) in between, where the operator
 307          // actually starts a new statement
 308          // (https://github.com/matthiasmullie/minify/issues/56)
 309          $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
 310          $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
 311          $after = '(?=\s*\n\s*('.implode('|', $operators).'))';
 312          $this->registerPattern('/'.$pattern.$after.'/', $callback);
 313      }
 314  
 315      /**
 316       * Strip whitespace.
 317       *
 318       * We won't strip *all* whitespace, but as much as possible. The thing that
 319       * we'll preserve are newlines we're unsure about.
 320       * JavaScript doesn't require statements to be terminated with a semicolon.
 321       * It will automatically fix missing semicolons with ASI (automatic semi-
 322       * colon insertion) at the end of line causing errors (without semicolon.)
 323       *
 324       * Because it's sometimes hard to tell if a newline is part of a statement
 325       * that should be terminated or not, we'll just leave some of them alone.
 326       *
 327       * @param string $content The content to strip the whitespace for
 328       *
 329       * @return string
 330       */
 331      protected function stripWhitespace($content)
 332      {
 333          // uniform line endings, make them all line feed
 334          $content = str_replace(array("\r\n", "\r"), "\n", $content);
 335  
 336          // collapse all non-line feed whitespace into a single space
 337          $content = preg_replace('/[^\S\n]+/', ' ', $content);
 338  
 339          // strip leading & trailing whitespace
 340          $content = str_replace(array(" \n", "\n "), "\n", $content);
 341  
 342          // collapse consecutive line feeds into just 1
 343          $content = preg_replace('/\n+/', "\n", $content);
 344  
 345          $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
 346          $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
 347          $operators = $this->getOperatorsForRegex($this->operators, '/');
 348          $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
 349          $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
 350  
 351          // strip whitespace that ends in (or next line begin with) an operator
 352          // that allows statements to be broken up over multiple lines
 353          unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
 354          $content = preg_replace(
 355              array(
 356                  '/('.implode('|', $operatorsBefore).')\s+/',
 357                  '/\s+('.implode('|', $operatorsAfter).')/',
 358              ),
 359              '\\1',
 360              $content
 361          );
 362  
 363          // make sure + and - can't be mistaken for, or joined into ++ and --
 364          $content = preg_replace(
 365              array(
 366                  '/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
 367                  '/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
 368              ),
 369              '\\1',
 370              $content
 371          );
 372  
 373          // collapse whitespace around reserved words into single space
 374          $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
 375          $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
 376  
 377          /*
 378           * We didn't strip whitespace after a couple of operators because they
 379           * could be used in different contexts and we can't be sure it's ok to
 380           * strip the newlines. However, we can safely strip any non-line feed
 381           * whitespace that follows them.
 382           */
 383          $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
 384          $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
 385          $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
 386          $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
 387  
 388          /*
 389           * Whitespace after `return` can be omitted in a few occasions
 390           * (such as when followed by a string or regex)
 391           * Same for whitespace in between `)` and `{`, or between `{` and some
 392           * keywords.
 393           */
 394          $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
 395          $content = preg_replace('/\)\s+\{/', '){', $content);
 396          $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content);
 397  
 398          /*
 399           * Get rid of double semicolons, except where they can be used like:
 400           * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
 401           * I'll safeguard these double semicolons inside for-loops by
 402           * temporarily replacing them with an invalid condition: they won't have
 403           * a double semicolon and will be easy to spot to restore afterwards.
 404           */
 405          $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
 406          $content = preg_replace('/;+/', ';', $content);
 407          $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
 408  
 409          /*
 410           * Next, we'll be removing all semicolons where ASI kicks in.
 411           * for-loops however, can have an empty body (ending in only a
 412           * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
 413           * Here, nothing happens during the loop; it's just used to keep
 414           * increasing `i`. With that ; omitted, the next line would be expected
 415           * to be the for-loop's body... Same goes for while loops.
 416           * I'm going to double that semicolon (if any) so after the next line,
 417           * which strips semicolons here & there, we're still left with this one.
 418           * Note the special recursive construct in the three inner parts of the for:
 419           * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline
 420           * functions bodies, e.g.: i<arr.map(function(e){return e}).length.
 421           * Also note that the construct is applied only once and multiplied
 422           * for each part of the for, otherwise it risks a catastrophic backtracking.
 423           * The limitation is that it will not allow closures in more than one
 424           * of the three parts for a specific for() case.
 425           * REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content);
 426           */
 427          $content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
 428          $content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
 429          $content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content);
 430  
 431          $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
 432  
 433          /*
 434           * Do the same for the if's that don't have a body but are followed by ;}
 435           */
 436          $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content);
 437  
 438          /*
 439           * Below will also keep `;` after a `do{}while();` along with `while();`
 440           * While these could be stripped after do-while, detecting this
 441           * distinction is cumbersome, so I'll play it safe and make sure `;`
 442           * after any kind of `while` is kept.
 443           */
 444          $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
 445  
 446          /*
 447           * We also can't strip empty else-statements. Even though they're
 448           * useless and probably shouldn't be in the code in the first place, we
 449           * shouldn't be stripping the `;` that follows it as it breaks the code.
 450           * We can just remove those useless else-statements completely.
 451           *
 452           * @see https://github.com/matthiasmullie/minify/issues/91
 453           */
 454          $content = preg_replace('/else;/s', '', $content);
 455  
 456          /*
 457           * We also don't really want to terminate statements followed by closing
 458           * curly braces (which we've ignored completely up until now) or end-of-
 459           * script: ASI will kick in here & we're all about minifying.
 460           * Semicolons at beginning of the file don't make any sense either.
 461           */
 462          $content = preg_replace('/;(\}|$)/s', '\\1', $content);
 463          $content = ltrim($content, ';');
 464  
 465          // get rid of remaining whitespace af beginning/end
 466          return trim($content);
 467      }
 468  
 469      /**
 470       * We'll strip whitespace around certain operators with regular expressions.
 471       * This will prepare the given array by escaping all characters.
 472       *
 473       * @param string[] $operators
 474       * @param string   $delimiter
 475       *
 476       * @return string[]
 477       */
 478      protected function getOperatorsForRegex(array $operators, $delimiter = '/')
 479      {
 480          // escape operators for use in regex
 481          $delimiters = array_fill(0, count($operators), $delimiter);
 482          $escaped = array_map('preg_quote', $operators, $delimiters);
 483  
 484          $operators = array_combine($operators, $escaped);
 485  
 486          // ignore + & - for now, they'll get special treatment
 487          unset($operators['+'], $operators['-']);
 488  
 489          // dot can not just immediately follow a number; it can be confused for
 490          // decimal point, or calling a method on it, e.g. 42 .toString()
 491          $operators['.'] = '(?<![0-9]\s)\.';
 492  
 493          // don't confuse = with other assignment shortcuts (e.g. +=)
 494          $chars = preg_quote('+-*\=<>%&|', $delimiter);
 495          $operators['='] = '(?<!['.$chars.'])\=';
 496  
 497          return $operators;
 498      }
 499  
 500      /**
 501       * We'll strip whitespace around certain keywords with regular expressions.
 502       * This will prepare the given array by escaping all characters.
 503       *
 504       * @param string[] $keywords
 505       * @param string   $delimiter
 506       *
 507       * @return string[]
 508       */
 509      protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
 510      {
 511          // escape keywords for use in regex
 512          $delimiter = array_fill(0, count($keywords), $delimiter);
 513          $escaped = array_map('preg_quote', $keywords, $delimiter);
 514  
 515          // add word boundaries
 516          array_walk($keywords, function ($value) {
 517              return '\b'.$value.'\b';
 518          });
 519  
 520          $keywords = array_combine($keywords, $escaped);
 521  
 522          return $keywords;
 523      }
 524  
 525      /**
 526       * Replaces all occurrences of array['key'] by array.key.
 527       *
 528       * @param string $content
 529       *
 530       * @return string
 531       */
 532      protected function propertyNotation($content)
 533      {
 534          // PHP only supports $this inside anonymous functions since 5.4
 535          $minifier = $this;
 536          $keywords = $this->keywordsReserved;
 537          $callback = function ($match) use ($minifier, $keywords) {
 538              $property = trim($minifier->extracted[$match[1]], '\'"');
 539  
 540              /*
 541               * Check if the property is a reserved keyword. In this context (as
 542               * property of an object literal/array) it shouldn't matter, but IE8
 543               * freaks out with "Expected identifier".
 544               */
 545              if (in_array($property, $keywords)) {
 546                  return $match[0];
 547              }
 548  
 549              /*
 550               * See if the property is in a variable-like format (e.g.
 551               * array['key-here'] can't be replaced by array.key-here since '-'
 552               * is not a valid character there.
 553               */
 554              if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
 555                  return $match[0];
 556              }
 557  
 558              return '.'.$property;
 559          };
 560  
 561          /*
 562           * Figure out if previous character is a variable name (of the array
 563           * we want to use property notation on) - this is to make sure
 564           * standalone ['value'] arrays aren't confused for keys-of-an-array.
 565           * We can (and only have to) check the last character, because PHP's
 566           * regex implementation doesn't allow unfixed-length look-behind
 567           * assertions.
 568           */
 569          preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
 570          $previousChar = $previousChar[1];
 571  
 572          /*
 573           * Make sure word preceding the ['value'] is not a keyword, e.g.
 574           * return['x']. Because -again- PHP's regex implementation doesn't allow
 575           * unfixed-length look-behind assertions, I'm just going to do a lot of
 576           * separate look-behind assertions, one for each keyword.
 577           */
 578          $keywords = $this->getKeywordsForRegex($keywords);
 579          $keywords = '(?<!'.implode(')(?<!', $keywords).')';
 580  
 581          return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
 582      }
 583  
 584      /**
 585       * Replaces true & false by !0 and !1.
 586       *
 587       * @param string $content
 588       *
 589       * @return string
 590       */
 591      protected function shortenBools($content)
 592      {
 593          /*
 594           * 'true' or 'false' could be used as property names (which may be
 595           * followed by whitespace) - we must not replace those!
 596           * Since PHP doesn't allow variable-length (to account for the
 597           * whitespace) lookbehind assertions, I need to capture the leading
 598           * character and check if it's a `.`
 599           */
 600          $callback = function ($match) {
 601              if (trim($match[1]) === '.') {
 602                  return $match[0];
 603              }
 604  
 605              return $match[1].($match[2] === 'true' ? '!0' : '!1');
 606          };
 607          $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
 608  
 609          // for(;;) is exactly the same as while(true), but shorter :)
 610          $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
 611  
 612          // now make sure we didn't turn any do ... while(true) into do ... for(;;)
 613          preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
 614  
 615          // go backward to make sure positional offsets aren't altered when $content changes
 616          $dos = array_reverse($dos);
 617          foreach ($dos as $do) {
 618              $offsetDo = $do[0][1];
 619  
 620              // find all `while` (now `for`) following `do`: one of those must be
 621              // associated with the `do` and be turned back into `while`
 622              preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
 623              foreach ($whiles as $while) {
 624                  $offsetWhile = $while[0][1];
 625  
 626                  $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
 627                  $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
 628                  if ($open === $close) {
 629                      // only restore `while` if amount of `{` and `}` are the same;
 630                      // otherwise, that `for` isn't associated with this `do`
 631                      $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
 632                      break;
 633                  }
 634              }
 635          }
 636  
 637          return $content;
 638      }
 639  }