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Developer Documentation

See Release Notes

  • Bug fixes for general core bugs in 3.11.x will end 14 Nov 2022 (12 months plus 6 months extension).
  • Bug fixes for security issues in 3.11.x will end 13 Nov 2023 (18 months plus 12 months extension).
  • PHP version: minimum PHP 7.3.0 Note: minimum PHP version has increased since Moodle 3.10. PHP 7.4.x is supported too.

Differences Between: [Versions 311 and 400] [Versions 311 and 401] [Versions 311 and 402] [Versions 311 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  }