includes/MagicWord.php

   1 <?php
   2 /**
   3  * File for magic words
   4  *
   5  * See docs/magicword.txt
   6  *
   7  * @file
   8  * @ingroup Parser
   9  */
  10
  11 /**
  12  * This class encapsulates "magic words" such as #redirect, __NOTOC__, etc.
  13  * Usage:
  14  *     if (MagicWord::get( 'redirect' )->match( $text ) )
  15  *
  16  * Possible future improvements:
  17  *   * Simultaneous searching for a number of magic words
  18  *   * MagicWord::$mObjects in shared memory
  19  *
  20  * Please avoid reading the data out of one of these objects and then writing
  21  * special case code. If possible, add another match()-like function here.
  22  *
  23  * To add magic words in an extension, use the LanguageGetMagic hook. For
  24  * magic words which are also Parser variables, add a MagicWordwgVariableIDs
  25  * hook. Use string keys.
  26  *
  27  * @ingroup Parser
  28  */
  29 class MagicWord {
  30         /**#@+
  31          * @private
  32          */
  33         var $mId, $mSynonyms, $mCaseSensitive;
  34         var $mRegex = '';
  35         var $mRegexStart = '';
  36         var $mBaseRegex = '';
  37         var $mVariableRegex = '';
  38         var $mModified = false;
  39         var $mFound = false;
  40
  41         static public $mVariableIDsInitialised = false;
  42         static public $mVariableIDs = array(
  43                 'currentmonth',
  44                 'currentmonth1',
  45                 'currentmonthname',
  46                 'currentmonthnamegen',
  47                 'currentmonthabbrev',
  48                 'currentday',
  49                 'currentday2',
  50                 'currentdayname',
  51                 'currentyear',
  52                 'currenttime',
  53                 'currenthour',
  54                 'localmonth',
  55                 'localmonth1',
  56                 'localmonthname',
  57                 'localmonthnamegen',
  58                 'localmonthabbrev',
  59                 'localday',
  60                 'localday2',
  61                 'localdayname',
  62                 'localyear',
  63                 'localtime',
  64                 'localhour',
  65                 'numberofarticles',
  66                 'numberoffiles',
  67                 'numberofedits',
  68                 'articlepath',
  69                 'sitename',
  70                 'server',
  71                 'servername',
  72                 'scriptpath',
  73                 'stylepath',
  74                 'pagename',
  75                 'pagenamee',
  76                 'fullpagename',
  77                 'fullpagenamee',
  78                 'namespace',
  79                 'namespacee',
  80                 'currentweek',
  81                 'currentdow',
  82                 'localweek',
  83                 'localdow',
  84                 'revisionid',
  85                 'revisionday',
  86                 'revisionday2',
  87                 'revisionmonth',
  88                 'revisionmonth1',
  89                 'revisionyear',
  90                 'revisiontimestamp',
  91                 'revisionuser',
  92                 'subpagename',
  93                 'subpagenamee',
  94                 'talkspace',
  95                 'talkspacee',
  96                 'subjectspace',
  97                 'subjectspacee',
  98                 'talkpagename',
  99                 'talkpagenamee',
 100                 'subjectpagename',
 101                 'subjectpagenamee',
 102                 'numberofusers',
 103                 'numberofactiveusers',
 104                 'numberofpages',
 105                 'currentversion',
 106                 'basepagename',
 107                 'basepagenamee',
 108                 'currenttimestamp',
 109                 'localtimestamp',
 110                 'directionmark',
 111                 'contentlanguage',
 112                 'numberofadmins',
 113                 'numberofviews',
 114         );
 115
 116         /* Array of caching hints for ParserCache */
 117         static public $mCacheTTLs = array (
 118                 'currentmonth' => 86400,
 119                 'currentmonth1' => 86400,
 120                 'currentmonthname' => 86400,
 121                 'currentmonthnamegen' => 86400,
 122                 'currentmonthabbrev' => 86400,
 123                 'currentday' => 3600,
 124                 'currentday2' => 3600,
 125                 'currentdayname' => 3600,
 126                 'currentyear' => 86400,
 127                 'currenttime' => 3600,
 128                 'currenthour' => 3600,
 129                 'localmonth' => 86400,
 130                 'localmonth1' => 86400,
 131                 'localmonthname' => 86400,
 132                 'localmonthnamegen' => 86400,
 133                 'localmonthabbrev' => 86400,
 134                 'localday' => 3600,
 135                 'localday2' => 3600,
 136                 'localdayname' => 3600,
 137                 'localyear' => 86400,
 138                 'localtime' => 3600,
 139                 'localhour' => 3600,
 140                 'numberofarticles' => 3600,
 141                 'numberoffiles' => 3600,
 142                 'numberofedits' => 3600,
 143                 'currentweek' => 3600,
 144                 'currentdow' => 3600,
 145                 'localweek' => 3600,
 146                 'localdow' => 3600,
 147                 'numberofusers' => 3600,
 148                 'numberofactiveusers' => 3600,
 149                 'numberofpages' => 3600,
 150                 'currentversion' => 86400,
 151                 'currenttimestamp' => 3600,
 152                 'localtimestamp' => 3600,
 153                 'pagesinnamespace' => 3600,
 154                 'numberofadmins' => 3600,
 155                 'numberofviews' => 3600,
 156                 'numberingroup' => 3600,
 157                 );
 158
 159         static public $mDoubleUnderscoreIDs = array(
 160                 'notoc',
 161                 'nogallery',
 162                 'forcetoc',
 163                 'toc',
 164                 'noeditsection',
 165                 'newsectionlink',
 166                 'nonewsectionlink',
 167                 'hiddencat',
 168                 'index',
 169                 'noindex',
 170                 'staticredirect',
 171                 'notitleconvert',
 172                 'nocontentconvert',
 173         );
 174
 175         static public $mSubstIDs = array(
 176                 'subst',
 177                 'safesubst',
 178         );
 179
 180         static public $mObjects = array();
 181         static public $mDoubleUnderscoreArray = null;
 182
 183         /**#@-*/
 184
 185         function __construct($id = 0, $syn = array(), $cs = false) {
 186                 $this->mId = $id;
 187                 $this->mSynonyms = (array)$syn;
 188                 $this->mCaseSensitive = $cs;
 189         }
 190
 191         /**
 192          * Factory: creates an object representing an ID
 193          * @static
 194          * @return MagicWord
 195          */
 196         static function &get( $id ) {
 197                 wfProfileIn( __METHOD__ );
 198                 if ( !isset( self::$mObjects[$id] ) ) {
 199                         $mw = new MagicWord();
 200                         $mw->load( $id );
 201                         self::$mObjects[$id] = $mw;
 202                 }
 203                 wfProfileOut( __METHOD__ );
 204                 return self::$mObjects[$id];
 205         }
 206
 207         /**
 208          * Get an array of parser variable IDs
 209          */
 210         static function getVariableIDs() {
 211                 if ( !self::$mVariableIDsInitialised ) {
 212                         # Deprecated constant definition hook, available for extensions that need it
 213                         $magicWords = array();
 214                         wfRunHooks( 'MagicWordMagicWords', array( &$magicWords ) );
 215                         foreach ( $magicWords as $word ) {
 216                                 define( $word, $word );
 217                         }
 218
 219                         # Get variable IDs
 220                         wfRunHooks( 'MagicWordwgVariableIDs', array( &self::$mVariableIDs ) );
 221                         self::$mVariableIDsInitialised = true;
 222                 }
 223                 return self::$mVariableIDs;
 224         }
 225
 226         /**
 227          * Get an array of parser substitution modifier IDs
 228          */
 229         static function getSubstIDs() {
 230                 return self::$mSubstIDs;
 231         }
 232
 233         /* Allow external reads of TTL array */
 234         static function getCacheTTL($id) {
 235                 if (array_key_exists($id,self::$mCacheTTLs)) {
 236                         return self::$mCacheTTLs[$id];
 237                 } else {
 238                         return -1;
 239                 }
 240         }
 241
 242         /** Get a MagicWordArray of double-underscore entities */
 243         static function getDoubleUnderscoreArray() {
 244                 if ( is_null( self::$mDoubleUnderscoreArray ) ) {
 245                         self::$mDoubleUnderscoreArray = new MagicWordArray( self::$mDoubleUnderscoreIDs );
 246                 }
 247                 return self::$mDoubleUnderscoreArray;
 248         }
 249
 250         /**
 251          * Clear the self::$mObjects variable
 252          * For use in parser tests
 253          */
 254         public static function clearCache() {
 255                 self::$mObjects = array();
 256         }
 257
 258         # Initialises this object with an ID
 259         function load( $id ) {
 260                 global $wgContLang;
 261                 $this->mId = $id;
 262                 $wgContLang->getMagic( $this );
 263                 if ( !$this->mSynonyms ) {
 264                         $this->mSynonyms = array( 'dkjsagfjsgashfajsh' );
 265                         #throw new MWException( "Error: invalid magic word '$id'" );
 266                         wfDebugLog( 'exception', "Error: invalid magic word '$id'\n" );
 267                 }
 268         }
 269
 270         /**
 271          * Preliminary initialisation
 272          * @private
 273          */
 274         function initRegex() {
 275                 // Sort the synonyms by length, descending, so that the longest synonym
 276                 // matches in precedence to the shortest
 277                 $synonyms = $this->mSynonyms;
 278                 usort( $synonyms, array( $this, 'compareStringLength' ) );
 279
 280                 $escSyn = array();
 281                 foreach ( $synonyms as $synonym )
 282                         // In case a magic word contains /, like that's going to happen;)
 283                         $escSyn[] = preg_quote( $synonym, '/' );
 284                 $this->mBaseRegex = implode( '|', $escSyn );
 285
 286                 $case = $this->mCaseSensitive ? '' : 'iu';
 287                 $this->mRegex = "/{$this->mBaseRegex}/{$case}";
 288                 $this->mRegexStart = "/^(?:{$this->mBaseRegex})/{$case}";
 289                 $this->mVariableRegex = str_replace( "\\$1", "(.*?)", $this->mRegex );
 290                 $this->mVariableStartToEndRegex = str_replace( "\\$1", "(.*?)",
 291                         "/^(?:{$this->mBaseRegex})$/{$case}" );
 292         }
 293
 294         /**
 295          * A comparison function that returns -1, 0 or 1 depending on whether the
 296          * first string is longer, the same length or shorter than the second
 297          * string.
 298          */
 299         function compareStringLength( $s1, $s2 ) {
 300                 $l1 = strlen( $s1 );
 301                 $l2 = strlen( $s2 );
 302                 if ( $l1 < $l2 ) {
 303                         return 1;
 304                 } elseif ( $l1 > $l2 ) {
 305                         return -1;
 306                 } else {
 307                         return 0;
 308                 }
 309         }
 310
 311         /**
 312          * Gets a regex representing matching the word
 313          */
 314         function getRegex() {
 315                 if ($this->mRegex == '' ) {
 316                         $this->initRegex();
 317                 }
 318                 return $this->mRegex;
 319         }
 320
 321         /**
 322          * Gets the regexp case modifier to use, i.e. i or nothing, to be used if
 323          * one is using MagicWord::getBaseRegex(), otherwise it'll be included in
 324          * the complete expression
 325          */
 326         function getRegexCase() {
 327                 if ( $this->mRegex === '' )
 328                         $this->initRegex();
 329
 330                 return $this->mCaseSensitive ? '' : 'iu';
 331         }
 332
 333         /**
 334          * Gets a regex matching the word, if it is at the string start
 335          */
 336         function getRegexStart() {
 337                 if ($this->mRegex == '' ) {
 338                         $this->initRegex();
 339                 }
 340                 return $this->mRegexStart;
 341         }
 342
 343         /**
 344          * regex without the slashes and what not
 345          */
 346         function getBaseRegex() {
 347                 if ($this->mRegex == '') {
 348                         $this->initRegex();
 349                 }
 350                 return $this->mBaseRegex;
 351         }
 352
 353         /**
 354          * Returns true if the text contains the word
 355          * @return bool
 356          */
 357         function match( $text ) {
 358                 return (bool)preg_match( $this->getRegex(), $text );
 359         }
 360
 361         /**
 362          * Returns true if the text starts with the word
 363          * @return bool
 364          */
 365         function matchStart( $text ) {
 366                 return (bool)preg_match( $this->getRegexStart(), $text );
 367         }
 368
 369         /**
 370          * Returns NULL if there's no match, the value of $1 otherwise
 371          * The return code is the matched string, if there's no variable
 372          * part in the regex and the matched variable part ($1) if there
 373          * is one.
 374          */
 375         function matchVariableStartToEnd( $text ) {
 376                 $matches = array();
 377                 $matchcount = preg_match( $this->getVariableStartToEndRegex(), $text, $matches );
 378                 if ( $matchcount == 0 ) {
 379                         return null;
 380                 } else {
 381                         # multiple matched parts (variable match); some will be empty because of
 382                         # synonyms. The variable will be the second non-empty one so remove any
 383                         # blank elements and re-sort the indices.
 384                         # See also bug 6526
 385
 386                         $matches = array_values(array_filter($matches));
 387
 388                         if ( count($matches) == 1 ) { return $matches[0]; }
 389                         else { return $matches[1]; }
 390                 }
 391         }
 392
 393
 394         /**
 395          * Returns true if the text matches the word, and alters the
 396          * input string, removing all instances of the word
 397          */
 398         function matchAndRemove( &$text ) {
 399                 $this->mFound = false;
 400                 $text = preg_replace_callback( $this->getRegex(), array( &$this, 'pregRemoveAndRecord' ), $text );
 401                 return $this->mFound;
 402         }
 403
 404         function matchStartAndRemove( &$text ) {
 405                 $this->mFound = false;
 406                 $text = preg_replace_callback( $this->getRegexStart(), array( &$this, 'pregRemoveAndRecord' ), $text );
 407                 return $this->mFound;
 408         }
 409
 410         /**
 411          * Used in matchAndRemove()
 412          * @private
 413          **/
 414         function pregRemoveAndRecord( ) {
 415                 $this->mFound = true;
 416                 return '';
 417         }
 418
 419         /**
 420          * Replaces the word with something else
 421          */
 422         function replace( $replacement, $subject, $limit=-1 ) {
 423                 $res = preg_replace( $this->getRegex(), StringUtils::escapeRegexReplacement( $replacement ), $subject, $limit );
 424                 $this->mModified = !($res === $subject);
 425                 return $res;
 426         }
 427
 428         /**
 429          * Variable handling: {{SUBST:xxx}} style words
 430          * Calls back a function to determine what to replace xxx with
 431          * Input word must contain $1
 432          */
 433         function substituteCallback( $text, $callback ) {
 434                 $res = preg_replace_callback( $this->getVariableRegex(), $callback, $text );
 435                 $this->mModified = !($res === $text);
 436                 return $res;
 437         }
 438
 439         /**
 440          * Matches the word, where $1 is a wildcard
 441          */
 442         function getVariableRegex()     {
 443                 if ( $this->mVariableRegex == '' ) {
 444                         $this->initRegex();
 445                 }
 446                 return $this->mVariableRegex;
 447         }
 448
 449         /**
 450          * Matches the entire string, where $1 is a wildcard
 451          */
 452         function getVariableStartToEndRegex() {
 453                 if ( $this->mVariableStartToEndRegex == '' ) {
 454                         $this->initRegex();
 455                 }
 456                 return $this->mVariableStartToEndRegex;
 457         }
 458
 459         /**
 460          * Accesses the synonym list directly
 461          */
 462         function getSynonym( $i ) {
 463                 return $this->mSynonyms[$i];
 464         }
 465
 466         function getSynonyms() {
 467                 return $this->mSynonyms;
 468         }
 469
 470         /**
 471          * Returns true if the last call to replace() or substituteCallback()
 472          * returned a modified text, otherwise false.
 473          */
 474         function getWasModified(){
 475                 return $this->mModified;
 476         }
 477
 478         /**
 479          * $magicarr is an associative array of (magic word ID => replacement)
 480          * This method uses the php feature to do several replacements at the same time,
 481          * thereby gaining some efficiency. The result is placed in the out variable
 482          * $result. The return value is true if something was replaced.
 483          * @static
 484          **/
 485         function replaceMultiple( $magicarr, $subject, &$result ){
 486                 $search = array();
 487                 $replace = array();
 488                 foreach( $magicarr as $id => $replacement ){
 489                         $mw = MagicWord::get( $id );
 490                         $search[] = $mw->getRegex();
 491                         $replace[] = $replacement;
 492                 }
 493
 494                 $result = preg_replace( $search, $replace, $subject );
 495                 return !($result === $subject);
 496         }
 497
 498         /**
 499          * Adds all the synonyms of this MagicWord to an array, to allow quick
 500          * lookup in a list of magic words
 501          */
 502         function addToArray( &$array, $value ) {
 503                 global $wgContLang;
 504                 foreach ( $this->mSynonyms as $syn ) {
 505                         $array[$wgContLang->lc($syn)] = $value;
 506                 }
 507         }
 508
 509         function isCaseSensitive() {
 510                 return $this->mCaseSensitive;
 511         }
 512
 513         function getId() {
 514                 return $this->mId;
 515         }
 516 }
 517
 518 /**
 519  * Class for handling an array of magic words
 520  * @ingroup Parser
 521  */
 522 class MagicWordArray {
 523         var $names = array();
 524         var $hash;
 525         var $baseRegex, $regex;
 526         var $matches;
 527
 528         function __construct( $names = array() ) {
 529                 $this->names = $names;
 530         }
 531
 532         /**
 533          * Add a magic word by name
 534          */
 535         public function add( $name ) {
 536                 $this->names[] = $name;
 537                 $this->hash = $this->baseRegex = $this->regex = null;
 538         }
 539
 540         /**
 541          * Add a number of magic words by name
 542          */
 543         public function addArray( $names ) {
 544                 $this->names = array_merge( $this->names, array_values( $names ) );
 545                 $this->hash = $this->baseRegex = $this->regex = null;
 546         }
 547
 548         /**
 549          * Get a 2-d hashtable for this array
 550          */
 551         function getHash() {
 552                 if ( is_null( $this->hash ) ) {
 553                         global $wgContLang;
 554                         $this->hash = array( 0 => array(), 1 => array() );
 555                         foreach ( $this->names as $name ) {
 556                                 $magic = MagicWord::get( $name );
 557                                 $case = intval( $magic->isCaseSensitive() );
 558                                 foreach ( $magic->getSynonyms() as $syn ) {
 559                                         if ( !$case ) {
 560                                                 $syn = $wgContLang->lc( $syn );
 561                                         }
 562                                         $this->hash[$case][$syn] = $name;
 563                                 }
 564                         }
 565                 }
 566                 return $this->hash;
 567         }
 568
 569         /**
 570          * Get the base regex
 571          */
 572         function getBaseRegex() {
 573                 if ( is_null( $this->baseRegex ) ) {
 574                         $this->baseRegex = array( 0 => '', 1 => '' );
 575                         foreach ( $this->names as $name ) {
 576                                 $magic = MagicWord::get( $name );
 577                                 $case = intval( $magic->isCaseSensitive() );
 578                                 foreach ( $magic->getSynonyms() as $i => $syn ) {
 579                                         $group = "(?P<{$i}_{$name}>" . preg_quote( $syn, '/' ) . ')';
 580                                         if ( $this->baseRegex[$case] === '' ) {
 581                                                 $this->baseRegex[$case] = $group;
 582                                         } else {
 583                                                 $this->baseRegex[$case] .= '|' . $group;
 584                                         }
 585                                 }
 586                         }
 587                 }
 588                 return $this->baseRegex;
 589         }
 590
 591         /**
 592          * Get an unanchored regex that does not match parameters
 593          */
 594         function getRegex() {
 595                 if ( is_null( $this->regex ) ) {
 596                         $base = $this->getBaseRegex();
 597                         $this->regex = array( '', '' );
 598                         if ( $this->baseRegex[0] !== '' ) {
 599                                 $this->regex[0] = "/{$base[0]}/iuS";
 600                         }
 601                         if ( $this->baseRegex[1] !== '' ) {
 602                                 $this->regex[1] = "/{$base[1]}/S";
 603                         }
 604                 }
 605                 return $this->regex;
 606         }
 607
 608         /**
 609          * Get a regex for matching variables with parameters
 610          */
 611         function getVariableRegex() {
 612                 return str_replace( "\\$1", "(.*?)", $this->getRegex() );
 613         }
 614
 615         /**
 616          * Get a regex anchored to the start of the string that does not match parameters
 617          */
 618         function getRegexStart() {
 619                 $base = $this->getBaseRegex();
 620                 $newRegex = array( '', '' );
 621                 if ( $base[0] !== '' ) {
 622                         $newRegex[0] = "/^(?:{$base[0]})/iuS";
 623                 }
 624                 if ( $base[1] !== '' ) {
 625                         $newRegex[1] = "/^(?:{$base[1]})/S";
 626                 }
 627                 return $newRegex;
 628         }
 629
 630         /**
 631          * Get an anchored regex for matching variables with parameters
 632          */
 633         function getVariableStartToEndRegex() {
 634                 $base = $this->getBaseRegex();
 635                 $newRegex = array( '', '' );
 636                 if ( $base[0] !== '' ) {
 637                         $newRegex[0] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[0]})$/iuS" );
 638                 }
 639                 if ( $base[1] !== '' ) {
 640                         $newRegex[1] = str_replace( "\\$1", "(.*?)", "/^(?:{$base[1]})$/S" );
 641                 }
 642                 return $newRegex;
 643         }
 644
 645         /**
 646          * Parse a match array from preg_match
 647          * Returns array(magic word ID, parameter value)
 648          * If there is no parameter value, that element will be false.
 649          */
 650         function parseMatch( $m ) {
 651                 reset( $m );
 652                 while ( list( $key, $value ) = each( $m ) ) {
 653                         if ( $key === 0 || $value === '' ) {
 654                                 continue;
 655                         }
 656                         $parts = explode( '_', $key, 2 );
 657                         if ( count( $parts ) != 2 ) {
 658                                 // This shouldn't happen
 659                                 // continue;
 660                                 throw new MWException( __METHOD__ . ': bad parameter name' );
 661                         }
 662                         list( /* $synIndex */, $magicName ) = $parts;
 663                         $paramValue = next( $m );
 664                         return array( $magicName, $paramValue );
 665                 }
 666                 // This shouldn't happen either
 667                 throw new MWException( __METHOD__.': parameter not found' );
 668         }
 669
 670         /**
 671          * Match some text, with parameter capture
 672          * Returns an array with the magic word name in the first element and the
 673          * parameter in the second element.
 674          * Both elements are false if there was no match.
 675          */
 676         public function matchVariableStartToEnd( $text ) {
 677                 $regexes = $this->getVariableStartToEndRegex();
 678                 foreach ( $regexes as $regex ) {
 679                         if ( $regex !== '' ) {
 680                                 $m = false;
 681                                 if ( preg_match( $regex, $text, $m ) ) {
 682                                         return $this->parseMatch( $m );
 683                                 }
 684                         }
 685                 }
 686                 return array( false, false );
 687         }
 688
 689         /**
 690          * Match some text, without parameter capture
 691          * Returns the magic word name, or false if there was no capture
 692          */
 693         public function matchStartToEnd( $text ) {
 694                 $hash = $this->getHash();
 695                 if ( isset( $hash[1][$text] ) ) {
 696                         return $hash[1][$text];
 697                 }
 698                 global $wgContLang;
 699                 $lc = $wgContLang->lc( $text );
 700                 if ( isset( $hash[0][$lc] ) ) {
 701                         return $hash[0][$lc];
 702                 }
 703                 return false;
 704         }
 705
 706         /**
 707          * Returns an associative array, ID => param value, for all items that match
 708          * Removes the matched items from the input string (passed by reference)
 709          */
 710         public function matchAndRemove( &$text ) {
 711                 $found = array();
 712                 $regexes = $this->getRegex();
 713                 foreach ( $regexes as $regex ) {
 714                         if ( $regex === '' ) {
 715                                 continue;
 716                         }
 717                         preg_match_all( $regex, $text, $matches, PREG_SET_ORDER );
 718                         foreach ( $matches as $m ) {
 719                                 list( $name, $param ) = $this->parseMatch( $m );
 720                                 $found[$name] = $param;
 721                         }
 722                         $text = preg_replace( $regex, '', $text );
 723                 }
 724                 return $found;
 725         }
 726
 727         /**
 728          * Return the ID of the magic word at the start of $text, and remove
 729          * the prefix from $text.
 730          * Return false if no match found and $text is not modified.
 731          * Does not match parameters.
 732          */
 733         public function matchStartAndRemove( &$text ) {
 734                 $regexes = $this->getRegexStart();
 735                 foreach ( $regexes as $regex ) {
 736                         if ( $regex === '' ) {
 737                                 continue;
 738                         }
 739                         if ( preg_match( $regex, $text, $m ) ) {
 740                                 list( $id, ) = $this->parseMatch( $m );
 741                                 if ( strlen( $m[0] ) >= strlen( $text ) ) {
 742                                         $text = '';
 743                                 } else {
 744                                         $text = substr( $text, strlen( $m[0] ) );
 745                                 }
 746                                 return $id;
 747                         }
 748                 }
 749                 return false;
 750         }
 751 }