includes/Parser.php

   1 <?php
   2 /**
   3  * File for Parser and related classes
   4  *
   5  * @package MediaWiki
   6  * @subpackage Parser
   7  */
   8
   9 /** */
  10 require_once( 'Sanitizer.php' );
  11 require_once( 'HttpFunctions.php' );
  12
  13 /**
  14  * Update this version number when the ParserOutput format
  15  * changes in an incompatible way, so the parser cache
  16  * can automatically discard old data.
  17  */
  18 define( 'MW_PARSER_VERSION', '1.5.0' );
  19
  20 /**
  21  * Variable substitution O(N^2) attack
  22  *
  23  * Without countermeasures, it would be possible to attack the parser by saving
  24  * a page filled with a large number of inclusions of large pages. The size of
  25  * the generated page would be proportional to the square of the input size.
  26  * Hence, we limit the number of inclusions of any given page, thus bringing any
  27  * attack back to O(N).
  28  */
  29
  30 define( 'MAX_INCLUDE_REPEAT', 100 );
  31 define( 'MAX_INCLUDE_SIZE', 1000000 ); // 1 Million
  32
  33 define( 'RLH_FOR_UPDATE', 1 );
  34
  35 # Allowed values for $mOutputType
  36 define( 'OT_HTML', 1 );
  37 define( 'OT_WIKI', 2 );
  38 define( 'OT_MSG' , 3 );
  39
  40 # string parameter for extractTags which will cause it
  41 # to strip HTML comments in addition to regular
  42 # <XML>-style tags. This should not be anything we
  43 # may want to use in wikisyntax
  44 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  45
  46 # prefix for escaping, used in two functions at least
  47 define( 'UNIQ_PREFIX', 'NaodW29');
  48
  49 # Constants needed for external link processing
  50 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  51 # Everything except bracket, space, or control characters
  52 define( 'EXT_LINK_URL_CLASS', '[^]<>"\\x00-\\x20\\x7F]' );
  53 # Including space
  54 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x00-\\x1F\\x7F]' );
  55 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  56 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  57 define( 'EXT_LINK_BRACKETED',  '/\[(\b('.$wgUrlProtocols.')'.EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  58 define( 'EXT_IMAGE_REGEX',
  59         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  60         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  61         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  62 );
  63
  64 /**
  65  * PHP Parser
  66  *
  67  * Processes wiki markup
  68  *
  69  * <pre>
  70  * There are three main entry points into the Parser class:
  71  * parse()
  72  *   produces HTML output
  73  * preSaveTransform().
  74  *   produces altered wiki markup.
  75  * transformMsg()
  76  *   performs brace substitution on MediaWiki messages
  77  *
  78  * Globals used:
  79  *    objects:   $wgLang, $wgLinkCache
  80  *
  81  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  82  *
  83  * settings:
  84  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  85  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  86  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  87  *
  88  *  * only within ParserOptions
  89  * </pre>
  90  *
  91  * @package MediaWiki
  92  */
  93 class Parser
  94 {
  95         /**#@+
  96          * @access private
  97          */
  98         # Persistent:
  99         var $mTagHooks;
 100
 101         # Cleared with clearState():
 102         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array(), $mCurrentParams = array();
 103         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 104         var $mInterwikiLinkHolders, $mLinkHolders;
 105
 106         # Temporary:
 107         var $mOptions, $mTitle, $mOutputType,
 108             $mTemplates,        // cache of already loaded templates, avoids
 109                                 // multiple SQL queries for the same string
 110             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 111                                 // in this path. Used for loop detection.
 112
 113         var $mIWTransData = array();
 114
 115         /**#@-*/
 116
 117         /**
 118          * Constructor
 119          *
 120          * @access public
 121          */
 122         function Parser() {
 123                 $this->mTemplates = array();
 124                 $this->mTemplatePath = array();
 125                 $this->mTagHooks = array();
 126                 $this->clearState();
 127         }
 128
 129         /**
 130          * Clear Parser state
 131          *
 132          * @access private
 133          */
 134         function clearState() {
 135                 $this->mOutput = new ParserOutput;
 136                 $this->mAutonumber = 0;
 137                 $this->mLastSection = '';
 138                 $this->mDTopen = false;
 139                 $this->mVariables = false;
 140                 $this->mIncludeCount = array();
 141                 $this->mStripState = array();
 142                 $this->mArgStack = array();
 143                 $this->mInPre = false;
 144                 $this->mCurrentParams = array();
 145                 $this->mInterwikiLinkHolders = array(
 146                         'texts' => array(),
 147                         'titles' => array()
 148                 );
 149                 $this->mLinkHolders = array(
 150                         'namespaces' => array(),
 151                         'dbkeys' => array(),
 152                         'queries' => array(),
 153                         'texts' => array(),
 154                         'titles' => array()
 155                 );
 156         }
 157
 158         /**
 159          * First pass--just handle <nowiki> sections, pass the rest off
 160          * to internalParse() which does all the real work.
 161          *
 162          * @access private
 163          * @param string $text Text we want to parse
 164          * @param Title &$title A title object
 165          * @param array $options
 166          * @param boolean $linestart
 167          * @param boolean $clearState
 168          * @return ParserOutput a ParserOutput
 169          */
 170         function parse( $text, &$title, $options, $linestart = true, $clearState = true ) {
 171                 global $wgUseTidy, $wgContLang;
 172                 $fname = 'Parser::parse';
 173                 wfProfileIn( $fname );
 174
 175                 if ( $clearState ) {
 176                         $this->clearState();
 177                 }
 178
 179                 $this->mOptions = $options;
 180                 $this->mTitle =& $title;
 181                 $this->mOutputType = OT_HTML;
 182
 183                 $this->mStripState = NULL;
 184
 185                 //$text = $this->strip( $text, $this->mStripState );
 186                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 187                 $x =& $this->mStripState;
 188
 189                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 190                 $text = $this->strip( $text, $x );
 191                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 192
 193                 $text = $this->internalParse( $text );
 194
 195                 $text = $this->unstrip( $text, $this->mStripState );
 196
 197                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 198                 $fixtags = array(
 199                         # french spaces, last one Guillemet-left
 200                         # only if there is something before the space
 201                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 202                         # french spaces, Guillemet-right
 203                         '/(\\302\\253) /' => '\\1&nbsp;',
 204                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 205                 );
 206                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 207
 208                 # only once and last
 209                 $text = $this->doBlockLevels( $text, $linestart );
 210
 211                 $this->replaceLinkHolders( $text );
 212
 213                 # the position of the convert() call should not be changed. it
 214                 # assumes that the links are all replaces and the only thing left
 215                 # is the <nowiki> mark.
 216                 $text = $wgContLang->convert($text);
 217                 $this->mOutput->setTitleText($wgContLang->getParsedTitle());
 218
 219                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 220
 221                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 222
 223                 $text = Sanitizer::normalizeCharReferences( $text );
 224
 225                 if ($wgUseTidy) {
 226                         $text = Parser::tidy($text);
 227                 }
 228
 229                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 230
 231                 $this->mOutput->setText( $text );
 232                 wfProfileOut( $fname );
 233                 return $this->mOutput;
 234         }
 235
 236         /**
 237          * Get a random string
 238          *
 239          * @access private
 240          * @static
 241          */
 242         function getRandomString() {
 243                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 244         }
 245
 246         /**
 247          * Replaces all occurrences of <$tag>content</$tag> in the text
 248          * with a random marker and returns the new text. the output parameter
 249          * $content will be an associative array filled with data on the form
 250          * $unique_marker => content.
 251          *
 252          * If $content is already set, the additional entries will be appended
 253          * If $tag is set to STRIP_COMMENTS, the function will extract
 254          * <!-- HTML comments -->
 255          *
 256          * @access private
 257          * @static
 258          */
 259         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 260                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 261                 if ( !$content ) {
 262                         $content = array( );
 263                 }
 264                 $n = 1;
 265                 $stripped = '';
 266
 267                 if ( !$tags ) {
 268                         $tags = array( );
 269                 }
 270
 271                 if ( !$params ) {
 272                         $params = array( );
 273                 }
 274
 275                 if( $tag == STRIP_COMMENTS ) {
 276                         $start = '/<!--()/';
 277                         $end   = '/-->/';
 278                 } else {
 279                         $start = "/<$tag(\\s+[^>]*|\\s*)>/i";
 280                         $end   = "/<\\/$tag\\s*>/i";
 281                 }
 282
 283                 while ( '' != $text ) {
 284                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 285                         $stripped .= $p[0];
 286                         if( count( $p ) < 3 ) {
 287                                 break;
 288                         }
 289                         $attributes = $p[1];
 290                         $inside     = $p[2];
 291
 292                         $marker = $rnd . sprintf('%08X', $n++);
 293                         $stripped .= $marker;
 294
 295                         $tags[$marker] = "<$tag$attributes>";
 296                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 297
 298                         $q = preg_split( $end, $inside, 2 );
 299                         $content[$marker] = $q[0];
 300                         if( count( $q ) < 2 ) {
 301                                 # No end tag -- let it run out to the end of the text.
 302                                 break;
 303                         } else {
 304                                 $text = $q[1];
 305                         }
 306                 }
 307                 return $stripped;
 308         }
 309
 310         /**
 311          * Wrapper function for extractTagsAndParams
 312          * for cases where $tags and $params isn't needed
 313          * i.e. where tags will never have params, like <nowiki>
 314          *
 315          * @access private
 316          * @static
 317          */
 318         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 319                 $dummy_tags = array();
 320                 $dummy_params = array();
 321
 322                 return Parser::extractTagsAndParams( $tag, $text, $content,
 323                         $dummy_tags, $dummy_params, $uniq_prefix );
 324         }
 325
 326         /**
 327          * Strips and renders nowiki, pre, math, hiero
 328          * If $render is set, performs necessary rendering operations on plugins
 329          * Returns the text, and fills an array with data needed in unstrip()
 330          * If the $state is already a valid strip state, it adds to the state
 331          *
 332          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 333          *  will be stripped in addition to other tags. This is important
 334          *  for section editing, where these comments cause confusion when
 335          *  counting the sections in the wikisource
 336          *
 337          * @access private
 338          */
 339         function strip( $text, &$state, $stripcomments = false ) {
 340                 $render = ($this->mOutputType == OT_HTML);
 341                 $html_content = array();
 342                 $nowiki_content = array();
 343                 $math_content = array();
 344                 $pre_content = array();
 345                 $comment_content = array();
 346                 $ext_content = array();
 347                 $ext_tags = array();
 348                 $ext_params = array();
 349                 $gallery_content = array();
 350
 351                 # Replace any instances of the placeholders
 352                 $uniq_prefix = UNIQ_PREFIX;
 353                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 354
 355                 # html
 356                 global $wgRawHtml;
 357                 if( $wgRawHtml ) {
 358                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 359                         foreach( $html_content as $marker => $content ) {
 360                                 if ($render ) {
 361                                         # Raw and unchecked for validity.
 362                                         $html_content[$marker] = $content;
 363                                 } else {
 364                                         $html_content[$marker] = '<html>'.$content.'</html>';
 365                                 }
 366                         }
 367                 }
 368
 369                 # nowiki
 370                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 371                 foreach( $nowiki_content as $marker => $content ) {
 372                         if( $render ){
 373                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 374                         } else {
 375                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 376                         }
 377                 }
 378
 379                 # math
 380                 if( $this->mOptions->getUseTeX() ) {
 381                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 382                         foreach( $math_content as $marker => $content ){
 383                                 if( $render ) {
 384                                         $math_content[$marker] = renderMath( $content );
 385                                 } else {
 386                                         $math_content[$marker] = '<math>'.$content.'</math>';
 387                                 }
 388                         }
 389                 }
 390
 391                 # pre
 392                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 393                 foreach( $pre_content as $marker => $content ){
 394                         if( $render ){
 395                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 396                         } else {
 397                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 398                         }
 399                 }
 400
 401                 # gallery
 402                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 403                 foreach( $gallery_content as $marker => $content ) {
 404                         require_once( 'ImageGallery.php' );
 405                         if ( $render ) {
 406                                 $gallery_content[$marker] = Parser::renderImageGallery( $content );
 407                         } else {
 408                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 409                         }
 410                 }
 411
 412                 # Comments
 413                 if($stripcomments) {
 414                         $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 415                         foreach( $comment_content as $marker => $content ){
 416                                 $comment_content[$marker] = '<!--'.$content.'-->';
 417                         }
 418                 }
 419
 420                 # Extensions
 421                 foreach ( $this->mTagHooks as $tag => $callback ) {
 422                         $ext_content[$tag] = array();
 423                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 424                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 425                         foreach( $ext_content[$tag] as $marker => $content ) {
 426                                 $content = $this->replaceVariables( $content, $this->mCurrentParams );
 427                                 $full_tag = $ext_tags[$tag][$marker];
 428                                 $params = $ext_params[$tag][$marker];
 429                                 if ( $render ) {
 430                                         $ext_content[$tag][$marker] = $callback( $content, $params, $this );
 431                                 } else {
 432                                         $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 433                                 }
 434                         }
 435                 }
 436
 437                 # Merge state with the pre-existing state, if there is one
 438                 if ( $state ) {
 439                         $state['html'] = $state['html'] + $html_content;
 440                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 441                         $state['math'] = $state['math'] + $math_content;
 442                         $state['pre'] = $state['pre'] + $pre_content;
 443                         $state['comment'] = $state['comment'] + $comment_content;
 444                         $state['gallery'] = $state['gallery'] + $gallery_content;
 445
 446                         foreach( $ext_content as $tag => $array ) {
 447                                 if ( array_key_exists( $tag, $state ) ) {
 448                                         $state[$tag] = $state[$tag] + $array;
 449                                 }
 450                         }
 451                 } else {
 452                         $state = array(
 453                           'html' => $html_content,
 454                           'nowiki' => $nowiki_content,
 455                           'math' => $math_content,
 456                           'pre' => $pre_content,
 457                           'comment' => $comment_content,
 458                           'gallery' => $gallery_content,
 459                         ) + $ext_content;
 460                 }
 461                 return $text;
 462         }
 463
 464         /**
 465          * restores pre, math, and hiero removed by strip()
 466          *
 467          * always call unstripNoWiki() after this one
 468          * @access private
 469          */
 470         function unstrip( $text, &$state ) {
 471                 if ( !is_array( $state ) ) {
 472                         return $text;
 473                 }
 474
 475                 # Must expand in reverse order, otherwise nested tags will be corrupted
 476                 $contentDict = end( $state );
 477                 for ( $contentDict = end( $state ); $contentDict !== false; $contentDict = prev( $state ) ) {
 478                         if( key($state) != 'nowiki' && key($state) != 'html') {
 479                                 for ( $content = end( $contentDict ); $content !== false; $content = prev( $contentDict ) ) {
 480                                         $text = str_replace( key( $contentDict ), $content, $text );
 481                                 }
 482                         }
 483                 }
 484
 485                 return $text;
 486         }
 487
 488         /**
 489          * always call this after unstrip() to preserve the order
 490          *
 491          * @access private
 492          */
 493         function unstripNoWiki( $text, &$state ) {
 494                 if ( !is_array( $state ) ) {
 495                         return $text;
 496                 }
 497
 498                 # Must expand in reverse order, otherwise nested tags will be corrupted
 499                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 500                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 501                 }
 502
 503                 global $wgRawHtml;
 504                 if ($wgRawHtml) {
 505                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 506                                 $text = str_replace( key( $state['html'] ), $content, $text );
 507                         }
 508                 }
 509
 510                 return $text;
 511         }
 512
 513         /**
 514          * Add an item to the strip state
 515          * Returns the unique tag which must be inserted into the stripped text
 516          * The tag will be replaced with the original text in unstrip()
 517          *
 518          * @access private
 519          */
 520         function insertStripItem( $text, &$state ) {
 521                 $rnd = UNIQ_PREFIX . '-item' . Parser::getRandomString();
 522                 if ( !$state ) {
 523                         $state = array(
 524                           'html' => array(),
 525                           'nowiki' => array(),
 526                           'math' => array(),
 527                           'pre' => array(),
 528                           'comment' => array(),
 529                           'gallery' => array(),
 530                         );
 531                 }
 532                 $state['item'][$rnd] = $text;
 533                 return $rnd;
 534         }
 535
 536         /**
 537          * Interface with html tidy, used if $wgUseTidy = true.
 538          * If tidy isn't able to correct the markup, the original will be
 539          * returned in all its glory with a warning comment appended.
 540          *
 541          * Either the external tidy program or the in-process tidy extension
 542          * will be used depending on availability. Override the default
 543          * $wgTidyInternal setting to disable the internal if it's not working.
 544          *
 545          * @param string $text Hideous HTML input
 546          * @return string Corrected HTML output
 547          * @access public
 548          * @static
 549          */
 550         function tidy( $text ) {
 551                 global $wgTidyInternal;
 552                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 553 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 554 '<head><title>test</title></head><body>'.$text.'</body></html>';
 555                 if( $wgTidyInternal ) {
 556                         $correctedtext = Parser::internalTidy( $wrappedtext );
 557                 } else {
 558                         $correctedtext = Parser::externalTidy( $wrappedtext );
 559                 }
 560                 if( is_null( $correctedtext ) ) {
 561                         wfDebug( "Tidy error detected!\n" );
 562                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 563                 }
 564                 return $correctedtext;
 565         }
 566
 567         /**
 568          * Spawn an external HTML tidy process and get corrected markup back from it.
 569          *
 570          * @access private
 571          * @static
 572          */
 573         function externalTidy( $text ) {
 574                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 575                 $fname = 'Parser::externalTidy';
 576                 wfProfileIn( $fname );
 577
 578                 $cleansource = '';
 579                 $opts = ' -utf8';
 580
 581                 $descriptorspec = array(
 582                         0 => array('pipe', 'r'),
 583                         1 => array('pipe', 'w'),
 584                         2 => array('file', '/dev/null', 'a')
 585                 );
 586                 $pipes = array();
 587                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 588                 if (is_resource($process)) {
 589                         fwrite($pipes[0], $text);
 590                         fclose($pipes[0]);
 591                         while (!feof($pipes[1])) {
 592                                 $cleansource .= fgets($pipes[1], 1024);
 593                         }
 594                         fclose($pipes[1]);
 595                         proc_close($process);
 596                 }
 597
 598                 wfProfileOut( $fname );
 599
 600                 if( $cleansource == '' && $text != '') {
 601                         // Some kind of error happened, so we couldn't get the corrected text.
 602                         // Just give up; we'll use the source text and append a warning.
 603                         return null;
 604                 } else {
 605                         return $cleansource;
 606                 }
 607         }
 608
 609         /**
 610          * Use the HTML tidy PECL extension to use the tidy library in-process,
 611          * saving the overhead of spawning a new process. Currently written to
 612          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 613          *
 614          * 'pear install tidy' should be able to compile the extension module.
 615          *
 616          * @access private
 617          * @static
 618          */
 619         function internalTidy( $text ) {
 620                 global $wgTidyConf;
 621                 $fname = 'Parser::internalTidy';
 622                 wfProfileIn( $fname );
 623
 624                 tidy_load_config( $wgTidyConf );
 625                 tidy_set_encoding( 'utf8' );
 626                 tidy_parse_string( $text );
 627                 tidy_clean_repair();
 628                 if( tidy_get_status() == 2 ) {
 629                         // 2 is magic number for fatal error
 630                         // http://www.php.net/manual/en/function.tidy-get-status.php
 631                         $cleansource = null;
 632                 } else {
 633                         $cleansource = tidy_get_output();
 634                 }
 635                 wfProfileOut( $fname );
 636                 return $cleansource;
 637         }
 638
 639         /**
 640          * parse the wiki syntax used to render tables
 641          *
 642          * @access private
 643          */
 644         function doTableStuff ( $t ) {
 645                 $fname = 'Parser::doTableStuff';
 646                 wfProfileIn( $fname );
 647
 648                 $t = explode ( "\n" , $t ) ;
 649                 $td = array () ; # Is currently a td tag open?
 650                 $ltd = array () ; # Was it TD or TH?
 651                 $tr = array () ; # Is currently a tr tag open?
 652                 $ltr = array () ; # tr attributes
 653                 $indent_level = 0; # indent level of the table
 654                 foreach ( $t AS $k => $x )
 655                 {
 656                         $x = trim ( $x ) ;
 657                         $fc = substr ( $x , 0 , 1 ) ;
 658                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 659                                 $indent_level = strlen( $matches[1] );
 660
 661                                 $attributes = $this->unstripForHTML( $matches[2] );
 662
 663                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 664                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 665                                 array_push ( $td , false ) ;
 666                                 array_push ( $ltd , '' ) ;
 667                                 array_push ( $tr , false ) ;
 668                                 array_push ( $ltr , '' ) ;
 669                         }
 670                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 671                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 672                                 $z = "</table>" . substr ( $x , 2);
 673                                 $l = array_pop ( $ltd ) ;
 674                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 675                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 676                                 array_pop ( $ltr ) ;
 677                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 678                         }
 679                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 680                                 $x = substr ( $x , 1 ) ;
 681                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 682                                 $z = '' ;
 683                                 $l = array_pop ( $ltd ) ;
 684                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 685                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 686                                 array_pop ( $ltr ) ;
 687                                 $t[$k] = $z ;
 688                                 array_push ( $tr , false ) ;
 689                                 array_push ( $td , false ) ;
 690                                 array_push ( $ltd , '' ) ;
 691                                 $attributes = $this->unstripForHTML( $x );
 692                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 693                         }
 694                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 695                                 # $x is a table row
 696                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 697                                         $fc = '+' ;
 698                                         $x = substr ( $x , 1 ) ;
 699                                 }
 700                                 $after = substr ( $x , 1 ) ;
 701                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 702                                 $after = explode ( '||' , $after ) ;
 703                                 $t[$k] = '' ;
 704
 705                                 # Loop through each table cell
 706                                 foreach ( $after AS $theline )
 707                                 {
 708                                         $z = '' ;
 709                                         if ( $fc != '+' )
 710                                         {
 711                                                 $tra = array_pop ( $ltr ) ;
 712                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 713                                                 array_push ( $tr , true ) ;
 714                                                 array_push ( $ltr , '' ) ;
 715                                         }
 716
 717                                         $l = array_pop ( $ltd ) ;
 718                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 719                                         if ( $fc == '|' ) $l = 'td' ;
 720                                         else if ( $fc == '!' ) $l = 'th' ;
 721                                         else if ( $fc == '+' ) $l = 'caption' ;
 722                                         else $l = '' ;
 723                                         array_push ( $ltd , $l ) ;
 724
 725                                         # Cell parameters
 726                                         $y = explode ( '|' , $theline , 2 ) ;
 727                                         # Note that a '|' inside an invalid link should not
 728                                         # be mistaken as delimiting cell parameters
 729                                         if ( strpos( $y[0], '[[' ) !== false ) {
 730                                                 $y = array ($theline);
 731                                         }
 732                                         if ( count ( $y ) == 1 )
 733                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 734                                         else {
 735                                                 $attributes = $this->unstripForHTML( $y[0] );
 736                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 737                                         }
 738                                         $t[$k] .= $y ;
 739                                         array_push ( $td , true ) ;
 740                                 }
 741                         }
 742                 }
 743
 744                 # Closing open td, tr && table
 745                 while ( count ( $td ) > 0 )
 746                 {
 747                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 748                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 749                         $t[] = '</table>' ;
 750                 }
 751
 752                 $t = implode ( "\n" , $t ) ;
 753                 wfProfileOut( $fname );
 754                 return $t ;
 755         }
 756
 757         /**
 758          * Helper function for parse() that transforms wiki markup into
 759          * HTML. Only called for $mOutputType == OT_HTML.
 760          *
 761          * @access private
 762          */
 763         function internalParse( $text ) {
 764                 global $wgContLang;
 765                 $args = array();
 766                 $isMain = true;
 767                 $fname = 'Parser::internalParse';
 768                 wfProfileIn( $fname );
 769
 770                 # Remove <noinclude> tags and <includeonly> sections
 771                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 772                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 773
 774                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 775                 $text = $this->replaceVariables( $text, $args );
 776
 777                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 778
 779                 $text = $this->doHeadings( $text );
 780                 if($this->mOptions->getUseDynamicDates()) {
 781                         $df =& DateFormatter::getInstance();
 782                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 783                 }
 784                 $text = $this->doAllQuotes( $text );
 785                 $text = $this->replaceInternalLinks( $text );
 786                 $text = $this->replaceExternalLinks( $text );
 787
 788                 # replaceInternalLinks may sometimes leave behind
 789                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 790                 $text = str_replace(UNIQ_PREFIX."NOPARSE", "", $text);
 791
 792                 $text = $this->doMagicLinks( $text );
 793                 $text = $this->doTableStuff( $text );
 794                 $text = $this->formatHeadings( $text, $isMain );
 795
 796                 $regex = '/<!--IW_TRANSCLUDE (\d+)-->/';
 797                 $text = preg_replace_callback($regex, array(&$this, 'scarySubstitution'), $text);
 798
 799                 wfProfileOut( $fname );
 800                 return $text;
 801         }
 802
 803         function scarySubstitution($matches) {
 804 #               return "[[".$matches[0]."]]";
 805                 return $this->mIWTransData[(int)$matches[0]];
 806         }
 807
 808         /**
 809          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 810          * magic external links.
 811          *
 812          * @access private
 813          */
 814         function &doMagicLinks( &$text ) {
 815                 $text = $this->magicISBN( $text );
 816                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 817                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 818                 return $text;
 819         }
 820
 821         /**
 822          * Parse ^^ tokens and return html
 823          *
 824          * @access private
 825          */
 826         function doExponent( $text ) {
 827                 $fname = 'Parser::doExponent';
 828                 wfProfileIn( $fname );
 829                 $text = preg_replace('/\^\^(.*?)\^\^/','<small><sup>\\1</sup></small>', $text);
 830                 wfProfileOut( $fname );
 831                 return $text;
 832         }
 833
 834         /**
 835          * Parse headers and return html
 836          *
 837          * @access private
 838          */
 839         function doHeadings( $text ) {
 840                 $fname = 'Parser::doHeadings';
 841                 wfProfileIn( $fname );
 842                 for ( $i = 6; $i >= 1; --$i ) {
 843                         $h = substr( '======', 0, $i );
 844                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 845                           "<h{$i}>\\1</h{$i}>\\2", $text );
 846                 }
 847                 wfProfileOut( $fname );
 848                 return $text;
 849         }
 850
 851         /**
 852          * Replace single quotes with HTML markup
 853          * @access private
 854          * @return string the altered text
 855          */
 856         function doAllQuotes( $text ) {
 857                 $fname = 'Parser::doAllQuotes';
 858                 wfProfileIn( $fname );
 859                 $outtext = '';
 860                 $lines = explode( "\n", $text );
 861                 foreach ( $lines as $line ) {
 862                         $outtext .= $this->doQuotes ( $line ) . "\n";
 863                 }
 864                 $outtext = substr($outtext, 0,-1);
 865                 wfProfileOut( $fname );
 866                 return $outtext;
 867         }
 868
 869         /**
 870          * Helper function for doAllQuotes()
 871          * @access private
 872          */
 873         function doQuotes( $text ) {
 874                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 875                 if ( count( $arr ) == 1 )
 876                         return $text;
 877                 else
 878                 {
 879                         # First, do some preliminary work. This may shift some apostrophes from
 880                         # being mark-up to being text. It also counts the number of occurrences
 881                         # of bold and italics mark-ups.
 882                         $i = 0;
 883                         $numbold = 0;
 884                         $numitalics = 0;
 885                         foreach ( $arr as $r )
 886                         {
 887                                 if ( ( $i % 2 ) == 1 )
 888                                 {
 889                                         # If there are ever four apostrophes, assume the first is supposed to
 890                                         # be text, and the remaining three constitute mark-up for bold text.
 891                                         if ( strlen( $arr[$i] ) == 4 )
 892                                         {
 893                                                 $arr[$i-1] .= "'";
 894                                                 $arr[$i] = "'''";
 895                                         }
 896                                         # If there are more than 5 apostrophes in a row, assume they're all
 897                                         # text except for the last 5.
 898                                         else if ( strlen( $arr[$i] ) > 5 )
 899                                         {
 900                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 901                                                 $arr[$i] = "'''''";
 902                                         }
 903                                         # Count the number of occurrences of bold and italics mark-ups.
 904                                         # We are not counting sequences of five apostrophes.
 905                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 906                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 907                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 908                                 }
 909                                 $i++;
 910                         }
 911
 912                         # If there is an odd number of both bold and italics, it is likely
 913                         # that one of the bold ones was meant to be an apostrophe followed
 914                         # by italics. Which one we cannot know for certain, but it is more
 915                         # likely to be one that has a single-letter word before it.
 916                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 917                         {
 918                                 $i = 0;
 919                                 $firstsingleletterword = -1;
 920                                 $firstmultiletterword = -1;
 921                                 $firstspace = -1;
 922                                 foreach ( $arr as $r )
 923                                 {
 924                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 925                                         {
 926                                                 $x1 = substr ($arr[$i-1], -1);
 927                                                 $x2 = substr ($arr[$i-1], -2, 1);
 928                                                 if ($x1 == ' ') {
 929                                                         if ($firstspace == -1) $firstspace = $i;
 930                                                 } else if ($x2 == ' ') {
 931                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 932                                                 } else {
 933                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 934                                                 }
 935                                         }
 936                                         $i++;
 937                                 }
 938
 939                                 # If there is a single-letter word, use it!
 940                                 if ($firstsingleletterword > -1)
 941                                 {
 942                                         $arr [ $firstsingleletterword ] = "''";
 943                                         $arr [ $firstsingleletterword-1 ] .= "'";
 944                                 }
 945                                 # If not, but there's a multi-letter word, use that one.
 946                                 else if ($firstmultiletterword > -1)
 947                                 {
 948                                         $arr [ $firstmultiletterword ] = "''";
 949                                         $arr [ $firstmultiletterword-1 ] .= "'";
 950                                 }
 951                                 # ... otherwise use the first one that has neither.
 952                                 # (notice that it is possible for all three to be -1 if, for example,
 953                                 # there is only one pentuple-apostrophe in the line)
 954                                 else if ($firstspace > -1)
 955                                 {
 956                                         $arr [ $firstspace ] = "''";
 957                                         $arr [ $firstspace-1 ] .= "'";
 958                                 }
 959                         }
 960
 961                         # Now let's actually convert our apostrophic mush to HTML!
 962                         $output = '';
 963                         $buffer = '';
 964                         $state = '';
 965                         $i = 0;
 966                         foreach ($arr as $r)
 967                         {
 968                                 if (($i % 2) == 0)
 969                                 {
 970                                         if ($state == 'both')
 971                                                 $buffer .= $r;
 972                                         else
 973                                                 $output .= $r;
 974                                 }
 975                                 else
 976                                 {
 977                                         if (strlen ($r) == 2)
 978                                         {
 979                                                 if ($state == 'i')
 980                                                 { $output .= '</i>'; $state = ''; }
 981                                                 else if ($state == 'bi')
 982                                                 { $output .= '</i>'; $state = 'b'; }
 983                                                 else if ($state == 'ib')
 984                                                 { $output .= '</b></i><b>'; $state = 'b'; }
 985                                                 else if ($state == 'both')
 986                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
 987                                                 else # $state can be 'b' or ''
 988                                                 { $output .= '<i>'; $state .= 'i'; }
 989                                         }
 990                                         else if (strlen ($r) == 3)
 991                                         {
 992                                                 if ($state == 'b')
 993                                                 { $output .= '</b>'; $state = ''; }
 994                                                 else if ($state == 'bi')
 995                                                 { $output .= '</i></b><i>'; $state = 'i'; }
 996                                                 else if ($state == 'ib')
 997                                                 { $output .= '</b>'; $state = 'i'; }
 998                                                 else if ($state == 'both')
 999                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1000                                                 else # $state can be 'i' or ''
1001                                                 { $output .= '<b>'; $state .= 'b'; }
1002                                         }
1003                                         else if (strlen ($r) == 5)
1004                                         {
1005                                                 if ($state == 'b')
1006                                                 { $output .= '</b><i>'; $state = 'i'; }
1007                                                 else if ($state == 'i')
1008                                                 { $output .= '</i><b>'; $state = 'b'; }
1009                                                 else if ($state == 'bi')
1010                                                 { $output .= '</i></b>'; $state = ''; }
1011                                                 else if ($state == 'ib')
1012                                                 { $output .= '</b></i>'; $state = ''; }
1013                                                 else if ($state == 'both')
1014                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1015                                                 else # ($state == '')
1016                                                 { $buffer = ''; $state = 'both'; }
1017                                         }
1018                                 }
1019                                 $i++;
1020                         }
1021                         # Now close all remaining tags.  Notice that the order is important.
1022                         if ($state == 'b' || $state == 'ib')
1023                                 $output .= '</b>';
1024                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1025                                 $output .= '</i>';
1026                         if ($state == 'bi')
1027                                 $output .= '</b>';
1028                         if ($state == 'both')
1029                                 $output .= '<b><i>'.$buffer.'</i></b>';
1030                         return $output;
1031                 }
1032         }
1033
1034         /**
1035          * Replace external links
1036          *
1037          * Note: this is all very hackish and the order of execution matters a lot.
1038          * Make sure to run maintenance/parserTests.php if you change this code.
1039          *
1040          * @access private
1041          */
1042         function replaceExternalLinks( $text ) {
1043                 global $wgContLang;
1044                 $fname = 'Parser::replaceExternalLinks';
1045                 wfProfileIn( $fname );
1046
1047                 $sk =& $this->mOptions->getSkin();
1048
1049                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1050
1051                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1052
1053                 $i = 0;
1054                 while ( $i<count( $bits ) ) {
1055                         $url = $bits[$i++];
1056                         $protocol = $bits[$i++];
1057                         $text = $bits[$i++];
1058                         $trail = $bits[$i++];
1059
1060                         # The characters '<' and '>' (which were escaped by
1061                         # removeHTMLtags()) should not be included in
1062                         # URLs, per RFC 2396.
1063                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1064                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1065                                 $url = substr($url, 0, $m2[0][1]);
1066                         }
1067
1068                         # If the link text is an image URL, replace it with an <img> tag
1069                         # This happened by accident in the original parser, but some people used it extensively
1070                         $img = $this->maybeMakeExternalImage( $text );
1071                         if ( $img !== false ) {
1072                                 $text = $img;
1073                         }
1074
1075                         $dtrail = '';
1076
1077                         # Set linktype for CSS - if URL==text, link is essentially free
1078                         $linktype = ($text == $url) ? 'free' : 'text';
1079
1080                         # No link text, e.g. [http://domain.tld/some.link]
1081                         if ( $text == '' ) {
1082                                 # Autonumber if allowed
1083                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1084                                         $text = '[' . ++$this->mAutonumber . ']';
1085                                         $linktype = 'autonumber';
1086                                 } else {
1087                                         # Otherwise just use the URL
1088                                         $text = htmlspecialchars( $url );
1089                                         $linktype = 'free';
1090                                 }
1091                         } else {
1092                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1093                                 # Check for trail
1094                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1095                         }
1096
1097                         $text = $wgContLang->markNoConversion($text);
1098
1099                         # Replace &amp; from obsolete syntax with &.
1100                         # All HTML entities will be escaped by makeExternalLink()
1101                         # or maybeMakeExternalImage()
1102                         $url = str_replace( '&amp;', '&', $url );
1103
1104                         # Process the trail (i.e. everything after this link up until start of the next link),
1105                         # replacing any non-bracketed links
1106                         $trail = $this->replaceFreeExternalLinks( $trail );
1107
1108
1109                         # Use the encoded URL
1110                         # This means that users can paste URLs directly into the text
1111                         # Funny characters like &ouml; aren't valid in URLs anyway
1112                         # This was changed in August 2004
1113                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1114                 }
1115
1116                 wfProfileOut( $fname );
1117                 return $s;
1118         }
1119
1120         /**
1121          * Replace anything that looks like a URL with a link
1122          * @access private
1123          */
1124         function replaceFreeExternalLinks( $text ) {
1125                 global $wgUrlProtocols;
1126                 global $wgContLang;
1127                 $fname = 'Parser::replaceFreeExternalLinks';
1128                 wfProfileIn( $fname );
1129
1130                 $bits = preg_split( '/(\b(?:'.$wgUrlProtocols.'))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1131                 $s = array_shift( $bits );
1132                 $i = 0;
1133
1134                 $sk =& $this->mOptions->getSkin();
1135
1136                 while ( $i < count( $bits ) ){
1137                         $protocol = $bits[$i++];
1138                         $remainder = $bits[$i++];
1139
1140                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1141                                 # Found some characters after the protocol that look promising
1142                                 $url = $protocol . $m[1];
1143                                 $trail = $m[2];
1144
1145                                 # The characters '<' and '>' (which were escaped by
1146                                 # removeHTMLtags()) should not be included in
1147                                 # URLs, per RFC 2396.
1148                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1149                                         $trail = substr($url, $m2[0][1]) . $trail;
1150                                         $url = substr($url, 0, $m2[0][1]);
1151                                 }
1152
1153                                 # Move trailing punctuation to $trail
1154                                 $sep = ',;\.:!?';
1155                                 # If there is no left bracket, then consider right brackets fair game too
1156                                 if ( strpos( $url, '(' ) === false ) {
1157                                         $sep .= ')';
1158                                 }
1159
1160                                 $numSepChars = strspn( strrev( $url ), $sep );
1161                                 if ( $numSepChars ) {
1162                                         $trail = substr( $url, -$numSepChars ) . $trail;
1163                                         $url = substr( $url, 0, -$numSepChars );
1164                                 }
1165
1166                                 # Replace &amp; from obsolete syntax with &.
1167                                 # All HTML entities will be escaped by makeExternalLink()
1168                                 # or maybeMakeExternalImage()
1169                                 $url = str_replace( '&amp;', '&', $url );
1170
1171                                 # Is this an external image?
1172                                 $text = $this->maybeMakeExternalImage( $url );
1173                                 if ( $text === false ) {
1174                                         # Not an image, make a link
1175                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1176                                 }
1177                                 $s .= $text . $trail;
1178                         } else {
1179                                 $s .= $protocol . $remainder;
1180                         }
1181                 }
1182                 wfProfileOut( $fname );
1183                 return $s;
1184         }
1185
1186         /**
1187          * make an image if it's allowed
1188          * @access private
1189          */
1190         function maybeMakeExternalImage( $url ) {
1191                 $sk =& $this->mOptions->getSkin();
1192                 $text = false;
1193                 if ( $this->mOptions->getAllowExternalImages() ) {
1194                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1195                                 # Image found
1196                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1197                         }
1198                 }
1199                 return $text;
1200         }
1201
1202         /**
1203          * Process [[ ]] wikilinks
1204          *
1205          * @access private
1206          */
1207         function replaceInternalLinks( $s ) {
1208                 global $wgContLang, $wgLinkCache, $wgUrlProtocols;
1209                 static $fname = 'Parser::replaceInternalLinks' ;
1210
1211                 wfProfileIn( $fname );
1212
1213                 wfProfileIn( $fname.'-setup' );
1214                 static $tc = FALSE;
1215                 # the % is needed to support urlencoded titles as well
1216                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1217
1218                 $sk =& $this->mOptions->getSkin();
1219
1220                 #split the entire text string on occurences of [[
1221                 $a = explode( '[[', ' ' . $s );
1222                 #get the first element (all text up to first [[), and remove the space we added
1223                 $s = array_shift( $a );
1224                 $s = substr( $s, 1 );
1225
1226                 # Match a link having the form [[namespace:link|alternate]]trail
1227                 static $e1 = FALSE;
1228                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1229                 # Match cases where there is no "]]", which might still be images
1230                 static $e1_img = FALSE;
1231                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1232                 # Match the end of a line for a word that's not followed by whitespace,
1233                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1234                 $e2 = wfMsgForContent( 'linkprefix' );
1235
1236                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1237
1238                 if( is_null( $this->mTitle ) ) {
1239                         wfDebugDieBacktrace( 'nooo' );
1240                 }
1241                 $nottalk = !$this->mTitle->isTalkPage();
1242
1243                 if ( $useLinkPrefixExtension ) {
1244                         if ( preg_match( $e2, $s, $m ) ) {
1245                                 $first_prefix = $m[2];
1246                         } else {
1247                                 $first_prefix = false;
1248                         }
1249                 } else {
1250                         $prefix = '';
1251                 }
1252
1253                 $selflink = $this->mTitle->getPrefixedText();
1254                 wfProfileOut( $fname.'-setup' );
1255
1256                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1257                 $useSubpages = $this->areSubpagesAllowed();
1258
1259                 # Loop for each link
1260                 for ($k = 0; isset( $a[$k] ); $k++) {
1261                         $line = $a[$k];
1262                         if ( $useLinkPrefixExtension ) {
1263                                 wfProfileIn( $fname.'-prefixhandling' );
1264                                 if ( preg_match( $e2, $s, $m ) ) {
1265                                         $prefix = $m[2];
1266                                         $s = $m[1];
1267                                 } else {
1268                                         $prefix='';
1269                                 }
1270                                 # first link
1271                                 if($first_prefix) {
1272                                         $prefix = $first_prefix;
1273                                         $first_prefix = false;
1274                                 }
1275                                 wfProfileOut( $fname.'-prefixhandling' );
1276                         }
1277
1278                         $might_be_img = false;
1279
1280                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1281                                 $text = $m[2];
1282                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1283                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1284                                 # the real problem is with the $e1 regex
1285                                 # See bug 1300.
1286                                 #
1287                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1288                                 # and no image is in sight. See bug 2095.
1289                                 #
1290                                 if( $text !== '' && preg_match( "/^\](.*)/s", $m[3], $n ) ) {
1291                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1292                                         $m[3] = $n[1];
1293                                 }
1294                                 # fix up urlencoded title texts
1295                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1296                                 $trail = $m[3];
1297                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1298                                 $might_be_img = true;
1299                                 $text = $m[2];
1300                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1301                                 $trail = "";
1302                         } else { # Invalid form; output directly
1303                                 $s .= $prefix . '[[' . $line ;
1304                                 continue;
1305                         }
1306
1307                         # Don't allow internal links to pages containing
1308                         # PROTO: where PROTO is a valid URL protocol; these
1309                         # should be external links.
1310                         if (preg_match('/^(\b(?:'.$wgUrlProtocols.'))/', $m[1])) {
1311                                 $s .= $prefix . '[[' . $line ;
1312                                 continue;
1313                         }
1314
1315                         # Make subpage if necessary
1316                         if( $useSubpages ) {
1317                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1318                         } else {
1319                                 $link = $m[1];
1320                         }
1321
1322                         $noforce = (substr($m[1], 0, 1) != ':');
1323                         if (!$noforce) {
1324                                 # Strip off leading ':'
1325                                 $link = substr($link, 1);
1326                         }
1327
1328                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1329                         if( !$nt ) {
1330                                 $s .= $prefix . '[[' . $line;
1331                                 continue;
1332                         }
1333
1334                         #check other language variants of the link
1335                         #if the article does not exist
1336                         if( $checkVariantLink
1337                             && $nt->getArticleID() == 0 ) {
1338                                 $wgContLang->findVariantLink($link, $nt);
1339                         }
1340
1341                         $ns = $nt->getNamespace();
1342                         $iw = $nt->getInterWiki();
1343
1344                         if ($might_be_img) { # if this is actually an invalid link
1345                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1346                                         $found = false;
1347                                         while (isset ($a[$k+1]) ) {
1348                                                 #look at the next 'line' to see if we can close it there
1349                                                 $spliced = array_splice( $a, $k + 1, 1 );
1350                                                 $next_line = array_shift( $spliced );
1351                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1352                                                 # the first ]] closes the inner link, the second the image
1353                                                         $found = true;
1354                                                         $text .= '[[' . $m[1];
1355                                                         $trail = $m[2];
1356                                                         break;
1357                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1358                                                         #if there's exactly one ]] that's fine, we'll keep looking
1359                                                         $text .= '[[' . $m[0];
1360                                                 } else {
1361                                                         #if $next_line is invalid too, we need look no further
1362                                                         $text .= '[[' . $next_line;
1363                                                         break;
1364                                                 }
1365                                         }
1366                                         if ( !$found ) {
1367                                                 # we couldn't find the end of this imageLink, so output it raw
1368                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1369                                                 $text = $this->replaceInternalLinks($text);
1370                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1371                                                 # note: no $trail, because without an end, there *is* no trail
1372                                                 continue;
1373                                         }
1374                                 } else { #it's not an image, so output it raw
1375                                         $s .= $prefix . '[[' . $link . '|' . $text;
1376                                         # note: no $trail, because without an end, there *is* no trail
1377                                         continue;
1378                                 }
1379                         }
1380
1381                         $wasblank = ( '' == $text );
1382                         if( $wasblank ) $text = $link;
1383
1384
1385                         # Link not escaped by : , create the various objects
1386                         if( $noforce ) {
1387
1388                                 # Interwikis
1389                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1390                                         array_push( $this->mOutput->mLanguageLinks, $nt->getFullText() );
1391                                         $s = rtrim($s . "\n");
1392                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1393                                         continue;
1394                                 }
1395
1396                                 if ( $ns == NS_IMAGE ) {
1397                                         wfProfileIn( "$fname-image" );
1398                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1399                                                 # recursively parse links inside the image caption
1400                                                 # actually, this will parse them in any other parameters, too,
1401                                                 # but it might be hard to fix that, and it doesn't matter ATM
1402                                                 $text = $this->replaceExternalLinks($text);
1403                                                 $text = $this->replaceInternalLinks($text);
1404
1405                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1406                                                 $s .= $prefix . preg_replace("/\b($wgUrlProtocols)/", UNIQ_PREFIX."NOPARSE$1", $this->makeImage( $nt, $text) ) . $trail;
1407                                                 $wgLinkCache->addImageLinkObj( $nt );
1408
1409                                                 wfProfileOut( "$fname-image" );
1410                                                 continue;
1411                                         }
1412                                         wfProfileOut( "$fname-image" );
1413
1414                                 }
1415
1416                                 if ( $ns == NS_CATEGORY ) {
1417                                         wfProfileIn( "$fname-category" );
1418                                         $t = $wgContLang->convertHtml( $nt->getText() );
1419                                         $s = rtrim($s . "\n"); # bug 87
1420
1421                                         $wgLinkCache->suspend(); # Don't save in links/brokenlinks
1422                                         $t = $sk->makeLinkObj( $nt, $t, '', '' , $prefix );
1423                                         $wgLinkCache->resume();
1424
1425                                         if ( $wasblank ) {
1426                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1427                                                         $sortkey = $this->mTitle->getText();
1428                                                 } else {
1429                                                         $sortkey = $this->mTitle->getPrefixedText();
1430                                                 }
1431                                         } else {
1432                                                 $sortkey = $text;
1433                                         }
1434                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1435                                         $wgLinkCache->addCategoryLinkObj( $nt, $sortkey );
1436                                         $this->mOutput->addCategoryLink( $t );
1437
1438                                         /**
1439                                          * Strip the whitespace Category links produce, see bug 87
1440                                          * @todo We might want to use trim($tmp, "\n") here.
1441                                          */
1442                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1443
1444                                         wfProfileOut( "$fname-category" );
1445                                         continue;
1446                                 }
1447                         }
1448
1449                         if( ( $nt->getPrefixedText() === $selflink ) &&
1450                             ( $nt->getFragment() === '' ) ) {
1451                                 # Self-links are handled specially; generally de-link and change to bold.
1452                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1453                                 continue;
1454                         }
1455
1456                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1457                         if( $ns == NS_MEDIA ) {
1458                                 $s .= $prefix . $sk->makeMediaLinkObj( $nt, $text, true ) . $trail;
1459                                 $wgLinkCache->addImageLinkObj( $nt );
1460                                 continue;
1461                         } elseif( $ns == NS_SPECIAL ) {
1462                                 $s .= $prefix . $sk->makeKnownLinkObj( $nt, $text, '', $trail );
1463                                 continue;
1464                         }
1465                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1466                 }
1467                 wfProfileOut( $fname );
1468                 return $s;
1469         }
1470
1471         /**
1472          * Make a link placeholder. The text returned can be later resolved to a real link with
1473          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1474          * parsing of interwiki links, and secondly to allow all extistence checks and
1475          * article length checks (for stub links) to be bundled into a single query.
1476          *
1477          */
1478         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1479                 if ( ! is_object($nt) ) {
1480                         # Fail gracefully
1481                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1482                 } else {
1483                         # Separate the link trail from the rest of the link
1484                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1485
1486                         if ( $nt->isExternal() ) {
1487                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1488                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1489                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1490                         } else {
1491                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1492                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1493                                 $this->mLinkHolders['queries'][] = $query;
1494                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1495                                 $this->mLinkHolders['titles'][] = $nt;
1496
1497                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1498                         }
1499                 }
1500                 return $retVal;
1501         }
1502
1503         /**
1504          * Return true if subpage links should be expanded on this page.
1505          * @return bool
1506          */
1507         function areSubpagesAllowed() {
1508                 # Some namespaces don't allow subpages
1509                 global $wgNamespacesWithSubpages;
1510                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1511         }
1512
1513         /**
1514          * Handle link to subpage if necessary
1515          * @param string $target the source of the link
1516          * @param string &$text the link text, modified as necessary
1517          * @return string the full name of the link
1518          * @access private
1519          */
1520         function maybeDoSubpageLink($target, &$text) {
1521                 # Valid link forms:
1522                 # Foobar -- normal
1523                 # :Foobar -- override special treatment of prefix (images, language links)
1524                 # /Foobar -- convert to CurrentPage/Foobar
1525                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1526                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1527                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1528
1529                 $fname = 'Parser::maybeDoSubpageLink';
1530                 wfProfileIn( $fname );
1531                 $ret = $target; # default return value is no change
1532
1533                 # Some namespaces don't allow subpages,
1534                 # so only perform processing if subpages are allowed
1535                 if( $this->areSubpagesAllowed() ) {
1536                         # Look at the first character
1537                         if( $target != '' && $target{0} == '/' ) {
1538                                 # / at end means we don't want the slash to be shown
1539                                 if( substr( $target, -1, 1 ) == '/' ) {
1540                                         $target = substr( $target, 1, -1 );
1541                                         $noslash = $target;
1542                                 } else {
1543                                         $noslash = substr( $target, 1 );
1544                                 }
1545
1546                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1547                                 if( '' === $text ) {
1548                                         $text = $target;
1549                                 } # this might be changed for ugliness reasons
1550                         } else {
1551                                 # check for .. subpage backlinks
1552                                 $dotdotcount = 0;
1553                                 $nodotdot = $target;
1554                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1555                                         ++$dotdotcount;
1556                                         $nodotdot = substr( $nodotdot, 3 );
1557                                 }
1558                                 if($dotdotcount > 0) {
1559                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1560                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1561                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1562                                                 # / at the end means don't show full path
1563                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1564                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1565                                                         if( '' === $text ) {
1566                                                                 $text = $nodotdot;
1567                                                         }
1568                                                 }
1569                                                 $nodotdot = trim( $nodotdot );
1570                                                 if( $nodotdot != '' ) {
1571                                                         $ret .= '/' . $nodotdot;
1572                                                 }
1573                                         }
1574                                 }
1575                         }
1576                 }
1577
1578                 wfProfileOut( $fname );
1579                 return $ret;
1580         }
1581
1582         /**#@+
1583          * Used by doBlockLevels()
1584          * @access private
1585          */
1586         /* private */ function closeParagraph() {
1587                 $result = '';
1588                 if ( '' != $this->mLastSection ) {
1589                         $result = '</' . $this->mLastSection  . ">\n";
1590                 }
1591                 $this->mInPre = false;
1592                 $this->mLastSection = '';
1593                 return $result;
1594         }
1595         # getCommon() returns the length of the longest common substring
1596         # of both arguments, starting at the beginning of both.
1597         #
1598         /* private */ function getCommon( $st1, $st2 ) {
1599                 $fl = strlen( $st1 );
1600                 $shorter = strlen( $st2 );
1601                 if ( $fl < $shorter ) { $shorter = $fl; }
1602
1603                 for ( $i = 0; $i < $shorter; ++$i ) {
1604                         if ( $st1{$i} != $st2{$i} ) { break; }
1605                 }
1606                 return $i;
1607         }
1608         # These next three functions open, continue, and close the list
1609         # element appropriate to the prefix character passed into them.
1610         #
1611         /* private */ function openList( $char ) {
1612                 $result = $this->closeParagraph();
1613
1614                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1615                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1616                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1617                 else if ( ';' == $char ) {
1618                         $result .= '<dl><dt>';
1619                         $this->mDTopen = true;
1620                 }
1621                 else { $result = '<!-- ERR 1 -->'; }
1622
1623                 return $result;
1624         }
1625
1626         /* private */ function nextItem( $char ) {
1627                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1628                 else if ( ':' == $char || ';' == $char ) {
1629                         $close = '</dd>';
1630                         if ( $this->mDTopen ) { $close = '</dt>'; }
1631                         if ( ';' == $char ) {
1632                                 $this->mDTopen = true;
1633                                 return $close . '<dt>';
1634                         } else {
1635                                 $this->mDTopen = false;
1636                                 return $close . '<dd>';
1637                         }
1638                 }
1639                 return '<!-- ERR 2 -->';
1640         }
1641
1642         /* private */ function closeList( $char ) {
1643                 if ( '*' == $char ) { $text = '</li></ul>'; }
1644                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1645                 else if ( ':' == $char ) {
1646                         if ( $this->mDTopen ) {
1647                                 $this->mDTopen = false;
1648                                 $text = '</dt></dl>';
1649                         } else {
1650                                 $text = '</dd></dl>';
1651                         }
1652                 }
1653                 else {  return '<!-- ERR 3 -->'; }
1654                 return $text."\n";
1655         }
1656         /**#@-*/
1657
1658         /**
1659          * Make lists from lines starting with ':', '*', '#', etc.
1660          *
1661          * @access private
1662          * @return string the lists rendered as HTML
1663          */
1664         function doBlockLevels( $text, $linestart ) {
1665                 $fname = 'Parser::doBlockLevels';
1666                 wfProfileIn( $fname );
1667
1668                 # Parsing through the text line by line.  The main thing
1669                 # happening here is handling of block-level elements p, pre,
1670                 # and making lists from lines starting with * # : etc.
1671                 #
1672                 $textLines = explode( "\n", $text );
1673
1674                 $lastPrefix = $output = '';
1675                 $this->mDTopen = $inBlockElem = false;
1676                 $prefixLength = 0;
1677                 $paragraphStack = false;
1678
1679                 if ( !$linestart ) {
1680                         $output .= array_shift( $textLines );
1681                 }
1682                 foreach ( $textLines as $oLine ) {
1683                         $lastPrefixLength = strlen( $lastPrefix );
1684                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1685                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1686                         if ( !$this->mInPre ) {
1687                                 # Multiple prefixes may abut each other for nested lists.
1688                                 $prefixLength = strspn( $oLine, '*#:;' );
1689                                 $pref = substr( $oLine, 0, $prefixLength );
1690
1691                                 # eh?
1692                                 $pref2 = str_replace( ';', ':', $pref );
1693                                 $t = substr( $oLine, $prefixLength );
1694                                 $this->mInPre = !empty($preOpenMatch);
1695                         } else {
1696                                 # Don't interpret any other prefixes in preformatted text
1697                                 $prefixLength = 0;
1698                                 $pref = $pref2 = '';
1699                                 $t = $oLine;
1700                         }
1701
1702                         # List generation
1703                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1704                                 # Same as the last item, so no need to deal with nesting or opening stuff
1705                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1706                                 $paragraphStack = false;
1707
1708                                 if ( substr( $pref, -1 ) == ';') {
1709                                         # The one nasty exception: definition lists work like this:
1710                                         # ; title : definition text
1711                                         # So we check for : in the remainder text to split up the
1712                                         # title and definition, without b0rking links.
1713                                         $term = $t2 = '';
1714                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1715                                                 $t = $t2;
1716                                                 $output .= $term . $this->nextItem( ':' );
1717                                         }
1718                                 }
1719                         } elseif( $prefixLength || $lastPrefixLength ) {
1720                                 # Either open or close a level...
1721                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1722                                 $paragraphStack = false;
1723
1724                                 while( $commonPrefixLength < $lastPrefixLength ) {
1725                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1726                                         --$lastPrefixLength;
1727                                 }
1728                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1729                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1730                                 }
1731                                 while ( $prefixLength > $commonPrefixLength ) {
1732                                         $char = substr( $pref, $commonPrefixLength, 1 );
1733                                         $output .= $this->openList( $char );
1734
1735                                         if ( ';' == $char ) {
1736                                                 # FIXME: This is dupe of code above
1737                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1738                                                         $t = $t2;
1739                                                         $output .= $term . $this->nextItem( ':' );
1740                                                 }
1741                                         }
1742                                         ++$commonPrefixLength;
1743                                 }
1744                                 $lastPrefix = $pref2;
1745                         }
1746                         if( 0 == $prefixLength ) {
1747                                 wfProfileIn( "$fname-paragraph" );
1748                                 # No prefix (not in list)--go to paragraph mode
1749                                 $uniq_prefix = UNIQ_PREFIX;
1750                                 // XXX: use a stack for nestable elements like span, table and div
1751                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1752                                 $closematch = preg_match(
1753                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1754                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$uniq_prefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1755                                 if ( $openmatch or $closematch ) {
1756                                         $paragraphStack = false;
1757                                         $output .= $this->closeParagraph();
1758                                         if ( $preOpenMatch and !$preCloseMatch ) {
1759                                                 $this->mInPre = true;
1760                                         }
1761                                         if ( $closematch ) {
1762                                                 $inBlockElem = false;
1763                                         } else {
1764                                                 $inBlockElem = true;
1765                                         }
1766                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1767                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1768                                                 // pre
1769                                                 if ($this->mLastSection != 'pre') {
1770                                                         $paragraphStack = false;
1771                                                         $output .= $this->closeParagraph().'<pre>';
1772                                                         $this->mLastSection = 'pre';
1773                                                 }
1774                                                 $t = substr( $t, 1 );
1775                                         } else {
1776                                                 // paragraph
1777                                                 if ( '' == trim($t) ) {
1778                                                         if ( $paragraphStack ) {
1779                                                                 $output .= $paragraphStack.'<br />';
1780                                                                 $paragraphStack = false;
1781                                                                 $this->mLastSection = 'p';
1782                                                         } else {
1783                                                                 if ($this->mLastSection != 'p' ) {
1784                                                                         $output .= $this->closeParagraph();
1785                                                                         $this->mLastSection = '';
1786                                                                         $paragraphStack = '<p>';
1787                                                                 } else {
1788                                                                         $paragraphStack = '</p><p>';
1789                                                                 }
1790                                                         }
1791                                                 } else {
1792                                                         if ( $paragraphStack ) {
1793                                                                 $output .= $paragraphStack;
1794                                                                 $paragraphStack = false;
1795                                                                 $this->mLastSection = 'p';
1796                                                         } else if ($this->mLastSection != 'p') {
1797                                                                 $output .= $this->closeParagraph().'<p>';
1798                                                                 $this->mLastSection = 'p';
1799                                                         }
1800                                                 }
1801                                         }
1802                                 }
1803                                 wfProfileOut( "$fname-paragraph" );
1804                         }
1805                         // somewhere above we forget to get out of pre block (bug 785)
1806                         if($preCloseMatch && $this->mInPre) {
1807                                 $this->mInPre = false;
1808                         }
1809                         if ($paragraphStack === false) {
1810                                 $output .= $t."\n";
1811                         }
1812                 }
1813                 while ( $prefixLength ) {
1814                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1815                         --$prefixLength;
1816                 }
1817                 if ( '' != $this->mLastSection ) {
1818                         $output .= '</' . $this->mLastSection . '>';
1819                         $this->mLastSection = '';
1820                 }
1821
1822                 wfProfileOut( $fname );
1823                 return $output;
1824         }
1825
1826         /**
1827          * Split up a string on ':', ignoring any occurences inside
1828          * <a>..</a> or <span>...</span>
1829          * @param string $str the string to split
1830          * @param string &$before set to everything before the ':'
1831          * @param string &$after set to everything after the ':'
1832          * return string the position of the ':', or false if none found
1833          */
1834         function findColonNoLinks($str, &$before, &$after) {
1835                 # I wonder if we should make this count all tags, not just <a>
1836                 # and <span>. That would prevent us from matching a ':' that
1837                 # comes in the middle of italics other such formatting....
1838                 # -- Wil
1839                 $fname = 'Parser::findColonNoLinks';
1840                 wfProfileIn( $fname );
1841                 $pos = 0;
1842                 do {
1843                         $colon = strpos($str, ':', $pos);
1844
1845                         if ($colon !== false) {
1846                                 $before = substr($str, 0, $colon);
1847                                 $after = substr($str, $colon + 1);
1848
1849                                 # Skip any ':' within <a> or <span> pairs
1850                                 $a = substr_count($before, '<a');
1851                                 $s = substr_count($before, '<span');
1852                                 $ca = substr_count($before, '</a>');
1853                                 $cs = substr_count($before, '</span>');
1854
1855                                 if ($a <= $ca and $s <= $cs) {
1856                                         # Tags are balanced before ':'; ok
1857                                         break;
1858                                 }
1859                                 $pos = $colon + 1;
1860                         }
1861                 } while ($colon !== false);
1862                 wfProfileOut( $fname );
1863                 return $colon;
1864         }
1865
1866         /**
1867          * Return value of a magic variable (like PAGENAME)
1868          *
1869          * @access private
1870          */
1871         function getVariableValue( $index ) {
1872                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgArticle, $wgScriptPath;
1873
1874                 /**
1875                  * Some of these require message or data lookups and can be
1876                  * expensive to check many times.
1877                  */
1878                 static $varCache = array();
1879                 if( isset( $varCache[$index] ) ) return $varCache[$index];
1880
1881                 switch ( $index ) {
1882                         case MAG_CURRENTMONTH:
1883                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm' ) );
1884                         case MAG_CURRENTMONTHNAME:
1885                                 return $varCache[$index] = $wgContLang->getMonthName( date('n') );
1886                         case MAG_CURRENTMONTHNAMEGEN:
1887                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date('n') );
1888                         case MAG_CURRENTMONTHABBREV:
1889                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date('n') );
1890                         case MAG_CURRENTDAY:
1891                                 return $varCache[$index] = $wgContLang->formatNum( date('j') );
1892                         case MAG_PAGENAME:
1893                                 return $this->mTitle->getText();
1894                         case MAG_PAGENAMEE:
1895                                 return $this->mTitle->getPartialURL();
1896                         case MAG_REVISIONID:
1897                                 return $wgArticle->getRevIdFetched();
1898                         case MAG_NAMESPACE:
1899                                 # return Namespace::getCanonicalName($this->mTitle->getNamespace());
1900                                 return $wgContLang->getNsText($this->mTitle->getNamespace()); # Patch by Dori
1901                         case MAG_CURRENTDAYNAME:
1902                                 return $varCache[$index] = $wgContLang->getWeekdayName( date('w')+1 );
1903                         case MAG_CURRENTYEAR:
1904                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y' ), true );
1905                         case MAG_CURRENTTIME:
1906                                 return $varCache[$index] = $wgContLang->time( wfTimestampNow(), false );
1907                         case MAG_CURRENTWEEK:
1908                                 return $varCache[$index] = $wgContLang->formatNum( date('W') );
1909                         case MAG_CURRENTDOW:
1910                                 return $varCache[$index] = $wgContLang->formatNum( date('w') );
1911                         case MAG_NUMBEROFARTICLES:
1912                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
1913                         case MAG_NUMBEROFFILES:
1914                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
1915                         case MAG_SITENAME:
1916                                 return $wgSitename;
1917                         case MAG_SERVER:
1918                                 return $wgServer;
1919                         case MAG_SERVERNAME:
1920                                 return $wgServerName;
1921                         case MAG_SCRIPTPATH:
1922                                 return $wgScriptPath;
1923                         default:
1924                                 return NULL;
1925                 }
1926         }
1927
1928         /**
1929          * initialise the magic variables (like CURRENTMONTHNAME)
1930          *
1931          * @access private
1932          */
1933         function initialiseVariables() {
1934                 $fname = 'Parser::initialiseVariables';
1935                 wfProfileIn( $fname );
1936                 global $wgVariableIDs;
1937                 $this->mVariables = array();
1938                 foreach ( $wgVariableIDs as $id ) {
1939                         $mw =& MagicWord::get( $id );
1940                         $mw->addToArray( $this->mVariables, $id );
1941                 }
1942                 wfProfileOut( $fname );
1943         }
1944
1945         /**
1946          * Replace magic variables, templates, and template arguments
1947          * with the appropriate text. Templates are substituted recursively,
1948          * taking care to avoid infinite loops.
1949          *
1950          * Note that the substitution depends on value of $mOutputType:
1951          *  OT_WIKI: only {{subst:}} templates
1952          *  OT_MSG: only magic variables
1953          *  OT_HTML: all templates and magic variables
1954          *
1955          * @param string $tex The text to transform
1956          * @param array $args Key-value pairs representing template parameters to substitute
1957          * @access private
1958          */
1959         function replaceVariables( $text, $args = array() ) {
1960
1961                 # Prevent too big inclusions
1962                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
1963                         return $text;
1964                 }
1965
1966                 $fname = 'Parser::replaceVariables';
1967                 wfProfileIn( $fname );
1968
1969                 $titleChars = Title::legalChars();
1970
1971                 # This function is called recursively. To keep track of arguments we need a stack:
1972                 array_push( $this->mArgStack, $args );
1973
1974                 # Variable substitution
1975                 $text = preg_replace_callback( "/{{([$titleChars]*?)}}/", array( &$this, 'variableSubstitution' ), $text );
1976
1977                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
1978                         # Argument substitution
1979                         $text = preg_replace_callback( "/{{{([$titleChars]*?)}}}/", array( &$this, 'argSubstitution' ), $text );
1980                 }
1981                 # Template substitution
1982                 $regex = '/(\\n|{)?{{(['.$titleChars.']*)(\\|.*?|)}}/s';
1983                 $text = preg_replace_callback( $regex, array( &$this, 'braceSubstitution' ), $text );
1984
1985                 array_pop( $this->mArgStack );
1986
1987                 wfProfileOut( $fname );
1988                 return $text;
1989         }
1990
1991         /**
1992          * Replace magic variables
1993          * @access private
1994          */
1995         function variableSubstitution( $matches ) {
1996                 $fname = 'parser::variableSubstitution';
1997                 $varname = $matches[1];
1998                 wfProfileIn( $fname );
1999                 if ( !$this->mVariables ) {
2000                         $this->initialiseVariables();
2001                 }
2002                 $skip = false;
2003                 if ( $this->mOutputType == OT_WIKI ) {
2004                         # Do only magic variables prefixed by SUBST
2005                         $mwSubst =& MagicWord::get( MAG_SUBST );
2006                         if (!$mwSubst->matchStartAndRemove( $varname ))
2007                                 $skip = true;
2008                         # Note that if we don't substitute the variable below,
2009                         # we don't remove the {{subst:}} magic word, in case
2010                         # it is a template rather than a magic variable.
2011                 }
2012                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2013                         $id = $this->mVariables[$varname];
2014                         $text = $this->getVariableValue( $id );
2015                         $this->mOutput->mContainsOldMagic = true;
2016                 } else {
2017                         $text = $matches[0];
2018                 }
2019                 wfProfileOut( $fname );
2020                 return $text;
2021         }
2022
2023         # Split template arguments
2024         function getTemplateArgs( $argsString ) {
2025                 if ( $argsString === '' ) {
2026                         return array();
2027                 }
2028
2029                 $args = explode( '|', substr( $argsString, 1 ) );
2030
2031                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2032                 # merged with the next arg because the '|' character between belongs
2033                 # to the link syntax and not the template parameter syntax.
2034                 $argc = count($args);
2035
2036                 for ( $i = 0; $i < $argc-1; $i++ ) {
2037                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2038                                 $args[$i] .= '|'.$args[$i+1];
2039                                 array_splice($args, $i+1, 1);
2040                                 $i--;
2041                                 $argc--;
2042                         }
2043                 }
2044
2045                 return $args;
2046         }
2047
2048         /**
2049          * Return the text of a template, after recursively
2050          * replacing any variables or templates within the template.
2051          *
2052          * @param array $matches The parts of the template
2053          *  $matches[1]: the title, i.e. the part before the |
2054          *  $matches[2]: the parameters (including a leading |), if  any
2055          * @return string the text of the template
2056          * @access private
2057          */
2058         function braceSubstitution( $matches ) {
2059                 global $wgLinkCache, $wgContLang;
2060                 $fname = 'Parser::braceSubstitution';
2061                 wfProfileIn( $fname );
2062
2063                 $found = false;
2064                 $nowiki = false;
2065                 $noparse = false;
2066
2067                 $title = NULL;
2068
2069                 # Need to know if the template comes at the start of a line,
2070                 # to treat the beginning of the template like the beginning
2071                 # of a line for tables and block-level elements.
2072                 $linestart = $matches[1];
2073
2074                 # $part1 is the bit before the first |, and must contain only title characters
2075                 # $args is a list of arguments, starting from index 0, not including $part1
2076
2077                 $part1 = $matches[2];
2078                 # If the third subpattern matched anything, it will start with |
2079
2080                 $args = $this->getTemplateArgs($matches[3]);
2081                 $argc = count( $args );
2082
2083                 # Don't parse {{{}}} because that's only for template arguments
2084                 if ( $linestart === '{' ) {
2085                         $text = $matches[0];
2086                         $found = true;
2087                         $noparse = true;
2088                 }
2089
2090                 # SUBST
2091                 if ( !$found ) {
2092                         $mwSubst =& MagicWord::get( MAG_SUBST );
2093                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2094                                 # One of two possibilities is true:
2095                                 # 1) Found SUBST but not in the PST phase
2096                                 # 2) Didn't find SUBST and in the PST phase
2097                                 # In either case, return without further processing
2098                                 $text = $matches[0];
2099                                 $found = true;
2100                                 $noparse = true;
2101                         }
2102                 }
2103
2104                 # MSG, MSGNW and INT
2105                 if ( !$found ) {
2106                         # Check for MSGNW:
2107                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2108                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2109                                 $nowiki = true;
2110                         } else {
2111                                 # Remove obsolete MSG:
2112                                 $mwMsg =& MagicWord::get( MAG_MSG );
2113                                 $mwMsg->matchStartAndRemove( $part1 );
2114                         }
2115
2116                         # Check if it is an internal message
2117                         $mwInt =& MagicWord::get( MAG_INT );
2118                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2119                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2120                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2121                                         $found = true;
2122                                 }
2123                         }
2124                 }
2125
2126                 # NS
2127                 if ( !$found ) {
2128                         # Check for NS: (namespace expansion)
2129                         $mwNs = MagicWord::get( MAG_NS );
2130                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2131                                 if ( intval( $part1 ) ) {
2132                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2133                                         $found = true;
2134                                 } else {
2135                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2136                                         if ( !is_null( $index ) ) {
2137                                                 $text = $linestart . $wgContLang->getNsText( $index );
2138                                                 $found = true;
2139                                         }
2140                                 }
2141                         }
2142                 }
2143
2144                 # LOCALURL and FULLURL
2145                 if ( !$found ) {
2146                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2147                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2148                         $mwFull =& MagicWord::get( MAG_FULLURL );
2149                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2150
2151
2152                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2153                                 $func = 'getLocalURL';
2154                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2155                                 $func = 'escapeLocalURL';
2156                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2157                                 $func = 'getFullURL';
2158                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2159                                 $func = 'escapeFullURL';
2160                         } else {
2161                                 $func = false;
2162                         }
2163
2164                         if ( $func !== false ) {
2165                                 $title = Title::newFromText( $part1 );
2166                                 if ( !is_null( $title ) ) {
2167                                         if ( $argc > 0 ) {
2168                                                 $text = $linestart . $title->$func( $args[0] );
2169                                         } else {
2170                                                 $text = $linestart . $title->$func();
2171                                         }
2172                                         $found = true;
2173                                 }
2174                         }
2175                 }
2176
2177                 # GRAMMAR
2178                 if ( !$found && $argc == 1 ) {
2179                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2180                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2181                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2182                                 $found = true;
2183                         }
2184                 }
2185
2186                 # PLURAL
2187                 if ( !$found && $argc >= 2 ) {
2188                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2189                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2190                                 if ($argc==2) {$args[2]=$args[1];}
2191                                 $text = $linestart . $wgContLang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2192                                 $found = true;
2193                         }
2194                 }
2195
2196                 # Template table test
2197
2198                 # Did we encounter this template already? If yes, it is in the cache
2199                 # and we need to check for loops.
2200                 if ( !$found && isset( $this->mTemplates[$part1] ) ) {
2201                         $found = true;
2202
2203                         # Infinite loop test
2204                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2205                                 $noparse = true;
2206                                 $found = true;
2207                                 $text = $linestart .
2208                                         "\{\{$part1}}" .
2209                                         '<!-- WARNING: template loop detected -->';
2210                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2211                         } else {
2212                                 # set $text to cached message.
2213                                 $text = $linestart . $this->mTemplates[$part1];
2214                         }
2215                 }
2216
2217                 # Load from database
2218                 $replaceHeadings = false;
2219                 $isHTML = false;
2220                 $lastPathLevel = $this->mTemplatePath;
2221                 if ( !$found ) {
2222                         $ns = NS_TEMPLATE;
2223                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage='' );
2224                         if ($subpage !== '') {
2225                                 $ns = $this->mTitle->getNamespace();
2226                         }
2227                         $title = Title::newFromText( $part1, $ns );
2228
2229                         if ($title) {
2230                                 $interwiki = Title::getInterwikiLink($title->getInterwiki());
2231                                 if ($interwiki != '' && $title->isTrans()) {
2232                                         return $this->scarytransclude($title, $interwiki);
2233                                 }
2234                         }
2235
2236                         if ( !is_null( $title ) && !$title->isExternal() ) {
2237                                 # Check for excessive inclusion
2238                                 $dbk = $title->getPrefixedDBkey();
2239                                 if ( $this->incrementIncludeCount( $dbk ) ) {
2240                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() ) {
2241                                                 # Capture special page output
2242                                                 $text = SpecialPage::capturePath( $title );
2243                                                 if ( is_string( $text ) ) {
2244                                                         $found = true;
2245                                                         $noparse = true;
2246                                                         $isHTML = true;
2247                                                         $this->disableCache();
2248                                                 }
2249                                         } else {
2250                                                 $article = new Article( $title );
2251                                                 $articleContent = $article->fetchContent(0, false);
2252                                                 if ( $articleContent !== false ) {
2253                                                         $found = true;
2254                                                         $text = $articleContent;
2255                                                         $replaceHeadings = true;
2256                                                 }
2257                                         }
2258                                 }
2259
2260                                 # If the title is valid but undisplayable, make a link to it
2261                                 if ( $this->mOutputType == OT_HTML && !$found ) {
2262                                         $text = '[['.$title->getPrefixedText().']]';
2263                                         $found = true;
2264                                 }
2265
2266                                 # Template cache array insertion
2267                                 if( $found ) {
2268                                         $this->mTemplates[$part1] = $text;
2269                                         $text = $linestart . $text;
2270                                 }
2271                         }
2272                 }
2273
2274                 # Recursive parsing, escaping and link table handling
2275                 # Only for HTML output
2276                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2277                         $text = wfEscapeWikiText( $text );
2278                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found && !$noparse) {
2279                         # Clean up argument array
2280                         $assocArgs = array();
2281                         $index = 1;
2282                         foreach( $args as $arg ) {
2283                                 $eqpos = strpos( $arg, '=' );
2284                                 if ( $eqpos === false ) {
2285                                         $assocArgs[$index++] = $arg;
2286                                 } else {
2287                                         $name = trim( substr( $arg, 0, $eqpos ) );
2288                                         $value = trim( substr( $arg, $eqpos+1 ) );
2289                                         if ( $value === false ) {
2290                                                 $value = '';
2291                                         }
2292                                         if ( $name !== false ) {
2293                                                 $assocArgs[$name] = $value;
2294                                         }
2295                                 }
2296                         }
2297
2298                         # Add a new element to the templace recursion path
2299                         $this->mTemplatePath[$part1] = 1;
2300
2301                         if( $this->mOutputType == OT_HTML ) {
2302                                 # Remove <noinclude> sections and <includeonly> tags
2303                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2304                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2305                                 # Strip <nowiki>, <pre>, etc.
2306                                 $this->mCurrentParams = $assocArgs;
2307                                 $text = $this->strip( $text, $this->mStripState );
2308                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2309                         }
2310                         $text = $this->replaceVariables( $text, $assocArgs );
2311
2312                         # Resume the link cache and register the inclusion as a link
2313                         if ( $this->mOutputType == OT_HTML && !is_null( $title ) ) {
2314                                 $wgLinkCache->addLinkObj( $title );
2315                         }
2316
2317                         # If the template begins with a table or block-level
2318                         # element, it should be treated as beginning a new line.
2319                         if ($linestart !== '\n' && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2320                                 $text = "\n" . $text;
2321                         }
2322                 }
2323                 # Prune lower levels off the recursion check path
2324                 $this->mTemplatePath = $lastPathLevel;
2325
2326                 if ( !$found ) {
2327                         wfProfileOut( $fname );
2328                         return $matches[0];
2329                 } else {
2330                         if ( $isHTML ) {
2331                                 # Replace raw HTML by a placeholder
2332                                 # Add a blank line preceding, to prevent it from mucking up
2333                                 # immediately preceding headings
2334                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2335                         } else {
2336                                 # replace ==section headers==
2337                                 # XXX this needs to go away once we have a better parser.
2338                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2339                                         if( !is_null( $title ) )
2340                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2341                                         else
2342                                                 $encodedname = base64_encode("");
2343                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2344                                                 PREG_SPLIT_DELIM_CAPTURE);
2345                                         $text = '';
2346                                         $nsec = 0;
2347                                         for( $i = 0; $i < count($m); $i += 2 ) {
2348                                                 $text .= $m[$i];
2349                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2350                                                 $hl = $m[$i + 1];
2351                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2352                                                         $text .= $hl;
2353                                                         continue;
2354                                                 }
2355                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2356                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2357                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2358
2359                                                 $nsec++;
2360                                         }
2361                                 }
2362                         }
2363                 }
2364
2365                 # Prune lower levels off the recursion check path
2366                 $this->mTemplatePath = $lastPathLevel;
2367
2368                 if ( !$found ) {
2369                         wfProfileOut( $fname );
2370                         return $matches[0];
2371                 } else {
2372                         wfProfileOut( $fname );
2373                         return $text;
2374                 }
2375         }
2376
2377         /**
2378          * Translude an interwiki link.
2379          */
2380         function scarytransclude($title, $interwiki) {
2381                 global $wgEnableScaryTranscluding;
2382
2383                 if (!$wgEnableScaryTranscluding)
2384                         return wfMsg('scarytranscludedisabled');
2385
2386                 $articlename = "Template:" . $title->getDBkey();
2387                 $url = str_replace('$1', urlencode($articlename), $interwiki);
2388                 if (strlen($url) > 255)
2389                         return wfMsg('scarytranscludetoolong');
2390                 $text = $this->fetchScaryTemplateMaybeFromCache($url);
2391                 $this->mIWTransData[] = $text;
2392                 return "<!--IW_TRANSCLUDE ".(count($this->mIWTransData) - 1)."-->";
2393         }
2394
2395         function fetchScaryTemplateMaybeFromCache($url) {
2396                 $dbr =& wfGetDB(DB_SLAVE);
2397                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2398                                 array('tc_url' => $url));
2399                 if ($obj) {
2400                         $time = $obj->tc_time;
2401                         $text = $obj->tc_contents;
2402                         if ($time && $time < (time() + (60*60))) {
2403                                 return $text;
2404                         }
2405                 }
2406
2407                 $text = wfGetHTTP($url . '?action=render');
2408                 if (!$text)
2409                         return wfMsg('scarytranscludefailed', $url);
2410
2411                 $dbw =& wfGetDB(DB_MASTER);
2412                 $dbw->replace('transcache', array(), array(
2413                         'tc_url' => $url,
2414                         'tc_time' => time(),
2415                         'tc_contents' => $text));
2416                 return $text;
2417         }
2418
2419
2420         /**
2421          * Triple brace replacement -- used for template arguments
2422          * @access private
2423          */
2424         function argSubstitution( $matches ) {
2425                 $arg = trim( $matches[1] );
2426                 $text = $matches[0];
2427                 $inputArgs = end( $this->mArgStack );
2428
2429                 if ( array_key_exists( $arg, $inputArgs ) ) {
2430                         $text = $inputArgs[$arg];
2431                 }
2432
2433                 return $text;
2434         }
2435
2436         /**
2437          * Returns true if the function is allowed to include this entity
2438          * @access private
2439          */
2440         function incrementIncludeCount( $dbk ) {
2441                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2442                         $this->mIncludeCount[$dbk] = 0;
2443                 }
2444                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2445                         return true;
2446                 } else {
2447                         return false;
2448                 }
2449         }
2450
2451         /**
2452          * This function accomplishes several tasks:
2453          * 1) Auto-number headings if that option is enabled
2454          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2455          * 3) Add a Table of contents on the top for users who have enabled the option
2456          * 4) Auto-anchor headings
2457          *
2458          * It loops through all headlines, collects the necessary data, then splits up the
2459          * string and re-inserts the newly formatted headlines.
2460          *
2461          * @param string $text
2462          * @param boolean $isMain
2463          * @access private
2464          */
2465         function formatHeadings( $text, $isMain=true ) {
2466                 global $wgMaxTocLevel, $wgContLang, $wgLinkHolders, $wgInterwikiLinkHolders;
2467
2468                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2469                 $doShowToc = true;
2470                 $forceTocHere = false;
2471                 if( !$this->mTitle->userCanEdit() ) {
2472                         $showEditLink = 0;
2473                 } else {
2474                         $showEditLink = $this->mOptions->getEditSection();
2475                 }
2476
2477                 # Inhibit editsection links if requested in the page
2478                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2479                 if( $esw->matchAndRemove( $text ) ) {
2480                         $showEditLink = 0;
2481                 }
2482                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
2483                 # do not add TOC
2484                 $mw =& MagicWord::get( MAG_NOTOC );
2485                 if( $mw->matchAndRemove( $text ) ) {
2486                         $doShowToc = false;
2487                 }
2488
2489                 # Get all headlines for numbering them and adding funky stuff like [edit]
2490                 # links - this is for later, but we need the number of headlines right now
2491                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
2492
2493                 # if there are fewer than 4 headlines in the article, do not show TOC
2494                 if( $numMatches < 4 ) {
2495                         $doShowToc = false;
2496                 }
2497
2498                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
2499                 # override above conditions and always show TOC at that place
2500
2501                 $mw =& MagicWord::get( MAG_TOC );
2502                 if($mw->match( $text ) ) {
2503                         $doShowToc = true;
2504                         $forceTocHere = true;
2505                 } else {
2506                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
2507                         # override above conditions and always show TOC above first header
2508                         $mw =& MagicWord::get( MAG_FORCETOC );
2509                         if ($mw->matchAndRemove( $text ) ) {
2510                                 $doShowToc = true;
2511                         }
2512                 }
2513
2514                 # Never ever show TOC if no headers
2515                 if( $numMatches < 1 ) {
2516                         $doShowToc = false;
2517                 }
2518
2519                 # We need this to perform operations on the HTML
2520                 $sk =& $this->mOptions->getSkin();
2521
2522                 # headline counter
2523                 $headlineCount = 0;
2524                 $sectionCount = 0; # headlineCount excluding template sections
2525
2526                 # Ugh .. the TOC should have neat indentation levels which can be
2527                 # passed to the skin functions. These are determined here
2528                 $toc = '';
2529                 $full = '';
2530                 $head = array();
2531                 $sublevelCount = array();
2532                 $levelCount = array();
2533                 $toclevel = 0;
2534                 $level = 0;
2535                 $prevlevel = 0;
2536                 $toclevel = 0;
2537                 $prevtoclevel = 0;
2538
2539                 foreach( $matches[3] as $headline ) {
2540                         $istemplate = 0;
2541                         $templatetitle = '';
2542                         $templatesection = 0;
2543                         $numbering = '';
2544
2545                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
2546                                 $istemplate = 1;
2547                                 $templatetitle = base64_decode($mat[1]);
2548                                 $templatesection = 1 + (int)base64_decode($mat[2]);
2549                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
2550                         }
2551
2552                         if( $toclevel ) {
2553                                 $prevlevel = $level;
2554                                 $prevtoclevel = $toclevel;
2555                         }
2556                         $level = $matches[1][$headlineCount];
2557
2558                         if( $doNumberHeadings || $doShowToc ) {
2559
2560                                 if ( $level > $prevlevel ) {
2561                                         # Increase TOC level
2562                                         $toclevel++;
2563                                         $sublevelCount[$toclevel] = 0;
2564                                         $toc .= $sk->tocIndent();
2565                                 }
2566                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
2567                                         # Decrease TOC level, find level to jump to
2568
2569                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
2570                                                 # Can only go down to level 1
2571                                                 $toclevel = 1;
2572                                         } else {
2573                                                 for ($i = $toclevel; $i > 0; $i--) {
2574                                                         if ( $levelCount[$i] == $level ) {
2575                                                                 # Found last matching level
2576                                                                 $toclevel = $i;
2577                                                                 break;
2578                                                         }
2579                                                         elseif ( $levelCount[$i] < $level ) {
2580                                                                 # Found first matching level below current level
2581                                                                 $toclevel = $i + 1;
2582                                                                 break;
2583                                                         }
2584                                                 }
2585                                         }
2586
2587                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
2588                                 }
2589                                 else {
2590                                         # No change in level, end TOC line
2591                                         $toc .= $sk->tocLineEnd();
2592                                 }
2593
2594                                 $levelCount[$toclevel] = $level;
2595
2596                                 # count number of headlines for each level
2597                                 @$sublevelCount[$toclevel]++;
2598                                 $dot = 0;
2599                                 for( $i = 1; $i <= $toclevel; $i++ ) {
2600                                         if( !empty( $sublevelCount[$i] ) ) {
2601                                                 if( $dot ) {
2602                                                         $numbering .= '.';
2603                                                 }
2604                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
2605                                                 $dot = 1;
2606                                         }
2607                                 }
2608                         }
2609
2610                         # The canonized header is a version of the header text safe to use for links
2611                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
2612                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
2613                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
2614
2615                         # Remove link placeholders by the link text.
2616                         #     <!--LINK number-->
2617                         # turns into
2618                         #     link text with suffix
2619                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
2620                                                             "\$this->mLinkHolders['texts'][\$1]",
2621                                                             $canonized_headline );
2622                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
2623                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
2624                                                             $canonized_headline );
2625
2626                         # strip out HTML
2627                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
2628                         $tocline = trim( $canonized_headline );
2629                         $canonized_headline = urlencode( Sanitizer::decodeCharReferences( str_replace(' ', '_', $tocline) ) );
2630                         $replacearray = array(
2631                                 '%3A' => ':',
2632                                 '%' => '.'
2633                         );
2634                         $canonized_headline = str_replace(array_keys($replacearray),array_values($replacearray),$canonized_headline);
2635                         $refers[$headlineCount] = $canonized_headline;
2636
2637                         # count how many in assoc. array so we can track dupes in anchors
2638                         @$refers[$canonized_headline]++;
2639                         $refcount[$headlineCount]=$refers[$canonized_headline];
2640
2641                         # Don't number the heading if it is the only one (looks silly)
2642                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
2643                                 # the two are different if the line contains a link
2644                                 $headline=$numbering . ' ' . $headline;
2645                         }
2646
2647                         # Create the anchor for linking from the TOC to the section
2648                         $anchor = $canonized_headline;
2649                         if($refcount[$headlineCount] > 1 ) {
2650                                 $anchor .= '_' . $refcount[$headlineCount];
2651                         }
2652                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
2653                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
2654                         }
2655                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
2656                                 if ( empty( $head[$headlineCount] ) ) {
2657                                         $head[$headlineCount] = '';
2658                                 }
2659                                 if( $istemplate )
2660                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
2661                                 else
2662                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1);
2663                         }
2664
2665                         # give headline the correct <h#> tag
2666                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
2667
2668                         $headlineCount++;
2669                         if( !$istemplate )
2670                                 $sectionCount++;
2671                 }
2672
2673                 if( $doShowToc ) {
2674                         $toc .= $sk->tocUnindent( $toclevel - 1 );
2675                         $toc = $sk->tocList( $toc );
2676                 }
2677
2678                 # split up and insert constructed headlines
2679
2680                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
2681                 $i = 0;
2682
2683                 foreach( $blocks as $block ) {
2684                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
2685                                 # This is the [edit] link that appears for the top block of text when
2686                                 # section editing is enabled
2687
2688                                 # Disabled because it broke block formatting
2689                                 # For example, a bullet point in the top line
2690                                 # $full .= $sk->editSectionLink(0);
2691                         }
2692                         $full .= $block;
2693                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
2694                         # Top anchor now in skin
2695                                 $full = $full.$toc;
2696                         }
2697
2698                         if( !empty( $head[$i] ) ) {
2699                                 $full .= $head[$i];
2700                         }
2701                         $i++;
2702                 }
2703                 if($forceTocHere) {
2704                         $mw =& MagicWord::get( MAG_TOC );
2705                         return $mw->replace( $toc, $full );
2706                 } else {
2707                         return $full;
2708                 }
2709         }
2710
2711         /**
2712          * Return an HTML link for the "ISBN 123456" text
2713          * @access private
2714          */
2715         function magicISBN( $text ) {
2716                 $fname = 'Parser::magicISBN';
2717                 wfProfileIn( $fname );
2718
2719                 $a = split( 'ISBN ', ' '.$text );
2720                 if ( count ( $a ) < 2 ) {
2721                         wfProfileOut( $fname );
2722                         return $text;
2723                 }
2724                 $text = substr( array_shift( $a ), 1);
2725                 $valid = '0123456789-Xx';
2726
2727                 foreach ( $a as $x ) {
2728                         $isbn = $blank = '' ;
2729                         while ( ' ' == $x{0} ) {
2730                                 $blank .= ' ';
2731                                 $x = substr( $x, 1 );
2732                         }
2733                         if ( $x == '' ) { # blank isbn
2734                                 $text .= "ISBN $blank";
2735                                 continue;
2736                         }
2737                         while ( strstr( $valid, $x{0} ) != false ) {
2738                                 $isbn .= $x{0};
2739                                 $x = substr( $x, 1 );
2740                         }
2741                         $num = str_replace( '-', '', $isbn );
2742                         $num = str_replace( ' ', '', $num );
2743                         $num = str_replace( 'x', 'X', $num );
2744
2745                         if ( '' == $num ) {
2746                                 $text .= "ISBN $blank$x";
2747                         } else {
2748                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
2749                                 $text .= '<a href="' .
2750                                 $titleObj->escapeLocalUrl( 'isbn='.$num ) .
2751                                         "\" class=\"internal\">ISBN $isbn</a>";
2752                                 $text .= $x;
2753                         }
2754                 }
2755                 wfProfileOut( $fname );
2756                 return $text;
2757         }
2758
2759         /**
2760          * Return an HTML link for the "RFC 1234" text
2761          *
2762          * @access private
2763          * @param string $text     Text to be processed
2764          * @param string $keyword  Magic keyword to use (default RFC)
2765          * @param string $urlmsg   Interface message to use (default rfcurl)
2766          * @return string
2767          */
2768         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
2769
2770                 $valid = '0123456789';
2771                 $internal = false;
2772
2773                 $a = split( $keyword, ' '.$text );
2774                 if ( count ( $a ) < 2 ) {
2775                         return $text;
2776                 }
2777                 $text = substr( array_shift( $a ), 1);
2778
2779                 /* Check if keyword is preceed by [[.
2780                  * This test is made here cause of the array_shift above
2781                  * that prevent the test to be done in the foreach.
2782                  */
2783                 if ( substr( $text, -2 ) == '[[' ) {
2784                         $internal = true;
2785                 }
2786
2787                 foreach ( $a as $x ) {
2788                         /* token might be empty if we have RFC RFC 1234 */
2789                         if ( $x=='' ) {
2790                                 $text.=$keyword;
2791                                 continue;
2792                                 }
2793
2794                         $id = $blank = '' ;
2795
2796                         /** remove and save whitespaces in $blank */
2797                         while ( $x{0} == ' ' ) {
2798                                 $blank .= ' ';
2799                                 $x = substr( $x, 1 );
2800                         }
2801
2802                         /** remove and save the rfc number in $id */
2803                         while ( strstr( $valid, $x{0} ) != false ) {
2804                                 $id .= $x{0};
2805                                 $x = substr( $x, 1 );
2806                         }
2807
2808                         if ( $id == '' ) {
2809                                 /* call back stripped spaces*/
2810                                 $text .= $keyword.$blank.$x;
2811                         } elseif( $internal ) {
2812                                 /* normal link */
2813                                 $text .= $keyword.$id.$x;
2814                         } else {
2815                                 /* build the external link*/
2816                                 $url = wfMsg( $urlmsg, $id);
2817                                 $sk =& $this->mOptions->getSkin();
2818                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
2819                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
2820                         }
2821
2822                         /* Check if the next RFC keyword is preceed by [[ */
2823                         $internal = ( substr($x,-2) == '[[' );
2824                 }
2825                 return $text;
2826         }
2827
2828         /**
2829          * Transform wiki markup when saving a page by doing \r\n -> \n
2830          * conversion, substitting signatures, {{subst:}} templates, etc.
2831          *
2832          * @param string $text the text to transform
2833          * @param Title &$title the Title object for the current article
2834          * @param User &$user the User object describing the current user
2835          * @param ParserOptions $options parsing options
2836          * @param bool $clearState whether to clear the parser state first
2837          * @return string the altered wiki markup
2838          * @access public
2839          */
2840         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
2841                 $this->mOptions = $options;
2842                 $this->mTitle =& $title;
2843                 $this->mOutputType = OT_WIKI;
2844
2845                 if ( $clearState ) {
2846                         $this->clearState();
2847                 }
2848
2849                 $stripState = false;
2850                 $pairs = array(
2851                         "\r\n" => "\n",
2852                 );
2853                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
2854                 $text = $this->strip( $text, $stripState, false );
2855                 $text = $this->pstPass2( $text, $user );
2856                 $text = $this->unstrip( $text, $stripState );
2857                 $text = $this->unstripNoWiki( $text, $stripState );
2858                 return $text;
2859         }
2860
2861         /**
2862          * Pre-save transform helper function
2863          * @access private
2864          */
2865         function pstPass2( $text, &$user ) {
2866                 global $wgContLang, $wgLocaltimezone;
2867
2868                 # Variable replacement
2869                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
2870                 $text = $this->replaceVariables( $text );
2871
2872                 # Signatures
2873                 #
2874                 $n = $user->getName();
2875                 $k = $user->getOption( 'nickname' );
2876                 if ( '' == $k ) { $k = $n; }
2877                 if ( isset( $wgLocaltimezone ) ) {
2878                         $oldtz = getenv( 'TZ' );
2879                         putenv( 'TZ='.$wgLocaltimezone );
2880                 }
2881
2882                 /* Note: This is the timestamp saved as hardcoded wikitext to
2883                  * the database, we use $wgContLang here in order to give
2884                  * everyone the same signiture and use the default one rather
2885                  * than the one selected in each users preferences.
2886                  */
2887                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
2888                   ' (' . date( 'T' ) . ')';
2889                 if ( isset( $wgLocaltimezone ) ) {
2890                         putenv( 'TZ='.$oldtz );
2891                 }
2892
2893                 if( $user->getOption( 'fancysig' ) ) {
2894                         $sigText = $k;
2895                 } else {
2896                         $sigText = '[[' . $wgContLang->getNsText( NS_USER ) . ":$n|$k]]";
2897                 }
2898                 $text = preg_replace( '/~~~~~/', $d, $text );
2899                 $text = preg_replace( '/~~~~/', "$sigText $d", $text );
2900                 $text = preg_replace( '/~~~/', $sigText, $text );
2901
2902                 # Context links: [[|name]] and [[name (context)|]]
2903                 #
2904                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
2905                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
2906                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
2907                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
2908
2909                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
2910                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
2911                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
2912                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
2913                 $context = '';
2914                 $t = $this->mTitle->getText();
2915                 if ( preg_match( $conpat, $t, $m ) ) {
2916                         $context = $m[2];
2917                 }
2918                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
2919                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
2920                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
2921
2922                 if ( '' == $context ) {
2923                         $text = preg_replace( $p2, '[[\\1]]', $text );
2924                 } else {
2925                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
2926                 }
2927
2928                 # Trim trailing whitespace
2929                 # MAG_END (__END__) tag allows for trailing
2930                 # whitespace to be deliberately included
2931                 $text = rtrim( $text );
2932                 $mw =& MagicWord::get( MAG_END );
2933                 $mw->matchAndRemove( $text );
2934
2935                 return $text;
2936         }
2937
2938         /**
2939          * Set up some variables which are usually set up in parse()
2940          * so that an external function can call some class members with confidence
2941          * @access public
2942          */
2943         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
2944                 $this->mTitle =& $title;
2945                 $this->mOptions = $options;
2946                 $this->mOutputType = $outputType;
2947                 if ( $clearState ) {
2948                         $this->clearState();
2949                 }
2950         }
2951
2952         /**
2953          * Transform a MediaWiki message by replacing magic variables.
2954          *
2955          * @param string $text the text to transform
2956          * @param ParserOptions $options  options
2957          * @return string the text with variables substituted
2958          * @access public
2959          */
2960         function transformMsg( $text, $options ) {
2961                 global $wgTitle;
2962                 static $executing = false;
2963
2964                 # Guard against infinite recursion
2965                 if ( $executing ) {
2966                         return $text;
2967                 }
2968                 $executing = true;
2969
2970                 $this->mTitle = $wgTitle;
2971                 $this->mOptions = $options;
2972                 $this->mOutputType = OT_MSG;
2973                 $this->clearState();
2974                 $text = $this->replaceVariables( $text );
2975
2976                 $executing = false;
2977                 return $text;
2978         }
2979
2980         /**
2981          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
2982          * Callback will be called with the text within
2983          * Transform and return the text within
2984          * @access public
2985          */
2986         function setHook( $tag, $callback ) {
2987                 $oldVal = @$this->mTagHooks[$tag];
2988                 $this->mTagHooks[$tag] = $callback;
2989                 return $oldVal;
2990         }
2991
2992         /**
2993          * Replace <!--LINK--> link placeholders with actual links, in the buffer
2994          * Placeholders created in Skin::makeLinkObj()
2995          * Returns an array of links found, indexed by PDBK:
2996          *  0 - broken
2997          *  1 - normal link
2998          *  2 - stub
2999          * $options is a bit field, RLH_FOR_UPDATE to select for update
3000          */
3001         function replaceLinkHolders( &$text, $options = 0 ) {
3002                 global $wgUser, $wgLinkCache;
3003                 global $wgOutputReplace;
3004
3005                 $fname = 'Parser::replaceLinkHolders';
3006                 wfProfileIn( $fname );
3007
3008                 $pdbks = array();
3009                 $colours = array();
3010                 $sk = $this->mOptions->getSkin();
3011
3012                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3013                         wfProfileIn( $fname.'-check' );
3014                         $dbr =& wfGetDB( DB_SLAVE );
3015                         $page = $dbr->tableName( 'page' );
3016                         $threshold = $wgUser->getOption('stubthreshold');
3017
3018                         # Sort by namespace
3019                         asort( $this->mLinkHolders['namespaces'] );
3020
3021                         # Generate query
3022                         $query = false;
3023                         foreach ( $this->mLinkHolders['namespaces'] as $key => $val ) {
3024                                 # Make title object
3025                                 $title = $this->mLinkHolders['titles'][$key];
3026
3027                                 # Skip invalid entries.
3028                                 # Result will be ugly, but prevents crash.
3029                                 if ( is_null( $title ) ) {
3030                                         continue;
3031                                 }
3032                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3033
3034                                 # Check if it's in the link cache already
3035                                 if ( $title->isAlwaysKnown() || $wgLinkCache->getGoodLinkID( $pdbk ) ) {
3036                                         $colours[$pdbk] = 1;
3037                                 } elseif ( $wgLinkCache->isBadLink( $pdbk ) ) {
3038                                         $colours[$pdbk] = 0;
3039                                 } else {
3040                                         # Not in the link cache, add it to the query
3041                                         if ( !isset( $current ) ) {
3042                                                 $current = $val;
3043                                                 $query =  "SELECT page_id, page_namespace, page_title";
3044                                                 if ( $threshold > 0 ) {
3045                                                         $query .= ', page_len, page_is_redirect';
3046                                                 }
3047                                                 $query .= " FROM $page WHERE (page_namespace=$val AND page_title IN(";
3048                                         } elseif ( $current != $val ) {
3049                                                 $current = $val;
3050                                                 $query .= ")) OR (page_namespace=$val AND page_title IN(";
3051                                         } else {
3052                                                 $query .= ', ';
3053                                         }
3054
3055                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3056                                 }
3057                         }
3058                         if ( $query ) {
3059                                 $query .= '))';
3060                                 if ( $options & RLH_FOR_UPDATE ) {
3061                                         $query .= ' FOR UPDATE';
3062                                 }
3063
3064                                 $res = $dbr->query( $query, $fname );
3065
3066                                 # Fetch data and form into an associative array
3067                                 # non-existent = broken
3068                                 # 1 = known
3069                                 # 2 = stub
3070                                 while ( $s = $dbr->fetchObject($res) ) {
3071                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3072                                         $pdbk = $title->getPrefixedDBkey();
3073                                         $wgLinkCache->addGoodLinkObj( $s->page_id, $title );
3074
3075                                         if ( $threshold >  0 ) {
3076                                                 $size = $s->page_len;
3077                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3078                                                         $colours[$pdbk] = 1;
3079                                                 } else {
3080                                                         $colours[$pdbk] = 2;
3081                                                 }
3082                                         } else {
3083                                                 $colours[$pdbk] = 1;
3084                                         }
3085                                 }
3086                         }
3087                         wfProfileOut( $fname.'-check' );
3088
3089                         # Construct search and replace arrays
3090                         wfProfileIn( $fname.'-construct' );
3091                         $wgOutputReplace = array();
3092                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3093                                 $pdbk = $pdbks[$key];
3094                                 $searchkey = "<!--LINK $key-->";
3095                                 $title = $this->mLinkHolders['titles'][$key];
3096                                 if ( empty( $colours[$pdbk] ) ) {
3097                                         $wgLinkCache->addBadLinkObj( $title );
3098                                         $colours[$pdbk] = 0;
3099                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3100                                                                         $this->mLinkHolders['texts'][$key],
3101                                                                         $this->mLinkHolders['queries'][$key] );
3102                                 } elseif ( $colours[$pdbk] == 1 ) {
3103                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3104                                                                         $this->mLinkHolders['texts'][$key],
3105                                                                         $this->mLinkHolders['queries'][$key] );
3106                                 } elseif ( $colours[$pdbk] == 2 ) {
3107                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3108                                                                         $this->mLinkHolders['texts'][$key],
3109                                                                         $this->mLinkHolders['queries'][$key] );
3110                                 }
3111                         }
3112                         wfProfileOut( $fname.'-construct' );
3113
3114                         # Do the thing
3115                         wfProfileIn( $fname.'-replace' );
3116
3117                         $text = preg_replace_callback(
3118                                 '/(<!--LINK .*?-->)/',
3119                                 "wfOutputReplaceMatches",
3120                                 $text);
3121
3122                         wfProfileOut( $fname.'-replace' );
3123                 }
3124
3125                 # Now process interwiki link holders
3126                 # This is quite a bit simpler than internal links
3127                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3128                         wfProfileIn( $fname.'-interwiki' );
3129                         # Make interwiki link HTML
3130                         $wgOutputReplace = array();
3131                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3132                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3133                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3134                         }
3135
3136                         $text = preg_replace_callback(
3137                                 '/<!--IWLINK (.*?)-->/',
3138                                 "wfOutputReplaceMatches",
3139                                 $text );
3140                         wfProfileOut( $fname.'-interwiki' );
3141                 }
3142
3143                 wfProfileOut( $fname );
3144                 return $colours;
3145         }
3146
3147         /**
3148          * Replace <!--LINK--> link placeholders with plain text of links
3149          * (not HTML-formatted).
3150          * @param string $text
3151          * @return string
3152          */
3153         function replaceLinkHoldersText( $text ) {
3154                 global $wgUser, $wgLinkCache;
3155                 global $wgOutputReplace;
3156
3157                 $fname = 'Parser::replaceLinkHoldersText';
3158                 wfProfileIn( $fname );
3159
3160                 $text = preg_replace_callback(
3161                         '/<!--(LINK|IWLINK) (.*?)-->/',
3162                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3163                         $text );
3164
3165                 wfProfileOut( $fname );
3166                 return $text;
3167         }
3168
3169         /**
3170          * @param array $matches
3171          * @return string
3172          * @access private
3173          */
3174         function replaceLinkHoldersTextCallback( $matches ) {
3175                 $type = $matches[1];
3176                 $key  = $matches[2];
3177                 if( $type == 'LINK' ) {
3178                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3179                                 return $this->mLinkHolders['texts'][$key];
3180                         }
3181                 } elseif( $type == 'IWLINK' ) {
3182                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3183                                 return $this->mInterwikiLinkHolders['texts'][$key];
3184                         }
3185                 }
3186                 return $matches[0];
3187         }
3188
3189         /**
3190          * Renders an image gallery from a text with one line per image.
3191          * text labels may be given by using |-style alternative text. E.g.
3192          *   Image:one.jpg|The number "1"
3193          *   Image:tree.jpg|A tree
3194          * given as text will return the HTML of a gallery with two images,
3195          * labeled 'The number "1"' and
3196          * 'A tree'.
3197          *
3198          * @static
3199          */
3200         function renderImageGallery( $text ) {
3201                 # Setup the parser
3202                 global $wgUser, $wgTitle;
3203                 $parserOptions = ParserOptions::newFromUser( $wgUser );
3204                 $localParser = new Parser();
3205
3206                 global $wgLinkCache;
3207                 $ig = new ImageGallery();
3208                 $ig->setShowBytes( false );
3209                 $ig->setShowFilename( false );
3210                 $lines = explode( "\n", $text );
3211
3212                 foreach ( $lines as $line ) {
3213                         # match lines like these:
3214                         # Image:someimage.jpg|This is some image
3215                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3216                         # Skip empty lines
3217                         if ( count( $matches ) == 0 ) {
3218                                 continue;
3219                         }
3220                         $nt = Title::newFromURL( $matches[1] );
3221                         if( is_null( $nt ) ) {
3222                                 # Bogus title. Ignore these so we don't bomb out later.
3223                                 continue;
3224                         }
3225                         if ( isset( $matches[3] ) ) {
3226                                 $label = $matches[3];
3227                         } else {
3228                                 $label = '';
3229                         }
3230
3231                         $html = $localParser->parse( $label , $wgTitle, $parserOptions );
3232                         $html = $html->mText;
3233
3234                         $ig->add( new Image( $nt ), $html );
3235                         $wgLinkCache->addImageLinkObj( $nt );
3236                 }
3237                 return $ig->toHTML();
3238         }
3239
3240         /**
3241          * Parse image options text and use it to make an image
3242          */
3243         function makeImage( &$nt, $options ) {
3244                 global $wgContLang, $wgUseImageResize;
3245                 global $wgUser, $wgThumbLimits;
3246
3247                 $align = '';
3248
3249                 # Check if the options text is of the form "options|alt text"
3250                 # Options are:
3251                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3252                 #  * left               no resizing, just left align. label is used for alt= only
3253                 #  * right              same, but right aligned
3254                 #  * none               same, but not aligned
3255                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3256                 #  * center             center the image
3257                 #  * framed             Keep original image size, no magnify-button.
3258
3259                 $part = explode( '|', $options);
3260
3261                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3262                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3263                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3264                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3265                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3266                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3267                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3268                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3269                 $caption = '';
3270
3271                 $width = $height = $framed = $thumb = false;
3272                 $manual_thumb = '' ;
3273
3274                 foreach( $part as $key => $val ) {
3275                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3276                                 $thumb=true;
3277                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3278                                 # use manually specified thumbnail
3279                                 $thumb=true;
3280                                 $manual_thumb = $match;
3281                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3282                                 # remember to set an alignment, don't render immediately
3283                                 $align = 'right';
3284                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
3285                                 # remember to set an alignment, don't render immediately
3286                                 $align = 'left';
3287                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
3288                                 # remember to set an alignment, don't render immediately
3289                                 $align = 'center';
3290                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
3291                                 # remember to set an alignment, don't render immediately
3292                                 $align = 'none';
3293                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
3294                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
3295                                 # $match is the image width in pixels
3296                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
3297                                         $width = intval( $m[1] );
3298                                         $height = intval( $m[2] );
3299                                 } else {
3300                                         $width = intval($match);
3301                                 }
3302                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
3303                                 $framed=true;
3304                         } else {
3305                                 $caption = $val;
3306                         }
3307                 }
3308                 # Strip bad stuff out of the alt text
3309                 $alt = $this->replaceLinkHoldersText( $caption );
3310                 $alt = Sanitizer::stripAllTags( $alt );
3311
3312                 # Linker does the rest
3313                 $sk =& $this->mOptions->getSkin();
3314                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
3315         }
3316
3317         /**
3318          * Set a flag in the output object indicating that the content is dynamic and
3319          * shouldn't be cached.
3320          */
3321         function disableCache() {
3322                 $this->mOutput->mCacheTime = -1;
3323         }
3324
3325         /**
3326          * Callback from the Sanitizer for expanding items found in HTML attribute
3327          * values, so they can be safely tested and escaped.
3328          * @param string $text
3329          * @param array $args
3330          * @return string
3331          * @access private
3332          */
3333         function attributeStripCallback( &$text, $args ) {
3334                 $text = $this->replaceVariables( $text, $args );
3335                 $text = $this->unstripForHTML( $text );
3336                 return $text;
3337         }
3338
3339         function unstripForHTML( $text ) {
3340                 $text = $this->unstrip( $text, $this->mStripState );
3341                 $text = $this->unstripNoWiki( $text, $this->mStripState );
3342                 return $text;
3343         }
3344 }
3345
3346 /**
3347  * @todo document
3348  * @package MediaWiki
3349  */
3350 class ParserOutput
3351 {
3352         var $mText, $mLanguageLinks, $mCategoryLinks, $mContainsOldMagic;
3353         var $mCacheTime; # Timestamp on this article, or -1 for uncacheable. Used in ParserCache.
3354         var $mVersion;   # Compatibility check
3355         var $mTitleText; # title text of the chosen language variant
3356
3357         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
3358                 $containsOldMagic = false, $titletext = '' )
3359         {
3360                 $this->mText = $text;
3361                 $this->mLanguageLinks = $languageLinks;
3362                 $this->mCategoryLinks = $categoryLinks;
3363                 $this->mContainsOldMagic = $containsOldMagic;
3364                 $this->mCacheTime = '';
3365                 $this->mVersion = MW_PARSER_VERSION;
3366                 $this->mTitleText = $titletext;
3367         }
3368
3369         function getText()                   { return $this->mText; }
3370         function getLanguageLinks()          { return $this->mLanguageLinks; }
3371         function getCategoryLinks()          { return array_keys( $this->mCategoryLinks ); }
3372         function getCacheTime()              { return $this->mCacheTime; }
3373         function getTitleText()              { return $this->mTitleText; }
3374         function containsOldMagic()          { return $this->mContainsOldMagic; }
3375         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
3376         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
3377         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategoryLinks, $cl ); }
3378         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
3379         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
3380         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
3381
3382         function addCategoryLink( $c )       { $this->mCategoryLinks[$c] = 1; }
3383
3384         function merge( $other ) {
3385                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $other->mLanguageLinks );
3386                 $this->mCategoryLinks = array_merge( $this->mCategoryLinks, $this->mLanguageLinks );
3387                 $this->mContainsOldMagic = $this->mContainsOldMagic || $other->mContainsOldMagic;
3388         }
3389
3390         /**
3391          * Return true if this cached output object predates the global or
3392          * per-article cache invalidation timestamps, or if it comes from
3393          * an incompatible older version.
3394          *
3395          * @param string $touched the affected article's last touched timestamp
3396          * @return bool
3397          * @access public
3398          */
3399         function expired( $touched ) {
3400                 global $wgCacheEpoch;
3401                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
3402                        $this->getCacheTime() <= $touched ||
3403                        $this->getCacheTime() <= $wgCacheEpoch ||
3404                        !isset( $this->mVersion ) ||
3405                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
3406         }
3407 }
3408
3409 /**
3410  * Set options of the Parser
3411  * @todo document
3412  * @package MediaWiki
3413  */
3414 class ParserOptions
3415 {
3416         # All variables are private
3417         var $mUseTeX;                    # Use texvc to expand <math> tags
3418         var $mUseDynamicDates;           # Use DateFormatter to format dates
3419         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
3420         var $mAllowExternalImages;       # Allow external images inline
3421         var $mSkin;                      # Reference to the preferred skin
3422         var $mDateFormat;                # Date format index
3423         var $mEditSection;               # Create "edit section" links
3424         var $mNumberHeadings;            # Automatically number headings
3425         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
3426
3427         function getUseTeX()                        { return $this->mUseTeX; }
3428         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
3429         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
3430         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
3431         function &getSkin()                         { return $this->mSkin; }
3432         function getDateFormat()                    { return $this->mDateFormat; }
3433         function getEditSection()                   { return $this->mEditSection; }
3434         function getNumberHeadings()                { return $this->mNumberHeadings; }
3435         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
3436
3437
3438         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
3439         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
3440         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
3441         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
3442         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
3443         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
3444         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
3445         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
3446
3447         function setSkin( &$x ) { $this->mSkin =& $x; }
3448
3449         function ParserOptions() {
3450                 global $wgUser;
3451                 $this->initialiseFromUser( $wgUser );
3452         }
3453
3454         /**
3455          * Get parser options
3456          * @static
3457          */
3458         function newFromUser( &$user ) {
3459                 $popts = new ParserOptions;
3460                 $popts->initialiseFromUser( $user );
3461                 return $popts;
3462         }
3463
3464         /** Get user options */
3465         function initialiseFromUser( &$userInput ) {
3466                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages,
3467                        $wgAllowSpecialInclusion;
3468                 $fname = 'ParserOptions::initialiseFromUser';
3469                 wfProfileIn( $fname );
3470                 if ( !$userInput ) {
3471                         $user = new User;
3472                         $user->setLoaded( true );
3473                 } else {
3474                         $user =& $userInput;
3475                 }
3476
3477                 $this->mUseTeX = $wgUseTeX;
3478                 $this->mUseDynamicDates = $wgUseDynamicDates;
3479                 $this->mInterwikiMagic = $wgInterwikiMagic;
3480                 $this->mAllowExternalImages = $wgAllowExternalImages;
3481                 wfProfileIn( $fname.'-skin' );
3482                 $this->mSkin =& $user->getSkin();
3483                 wfProfileOut( $fname.'-skin' );
3484                 $this->mDateFormat = $user->getOption( 'date' );
3485                 $this->mEditSection = true;
3486                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
3487                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
3488                 wfProfileOut( $fname );
3489         }
3490 }
3491
3492 /**
3493  * Callback function used by Parser::replaceLinkHolders()
3494  * to substitute link placeholders.
3495  */
3496 function &wfOutputReplaceMatches( $matches ) {
3497         global $wgOutputReplace;
3498         return $wgOutputReplace[$matches[1]];
3499 }
3500
3501 /**
3502  * Return the total number of articles
3503  */
3504 function wfNumberOfArticles() {
3505         global $wgNumberOfArticles;
3506
3507         wfLoadSiteStats();
3508         return $wgNumberOfArticles;
3509 }
3510
3511 /**
3512  * Return the number of files
3513  */
3514 function wfNumberOfFiles() {
3515         $fname = 'Parser::wfNumberOfFiles';
3516
3517         wfProfileIn( $fname );
3518         $dbr =& wfGetDB( DB_SLAVE );
3519         $res = $dbr->selectField('image', 'COUNT(*)', array(), $fname );
3520         wfProfileOut( $fname );
3521
3522         return $res;
3523 }
3524
3525 /**
3526  * Get various statistics from the database
3527  * @private
3528  */
3529 function wfLoadSiteStats() {
3530         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
3531         $fname = 'wfLoadSiteStats';
3532
3533         if ( -1 != $wgNumberOfArticles ) return;
3534         $dbr =& wfGetDB( DB_SLAVE );
3535         $s = $dbr->selectRow( 'site_stats',
3536                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
3537                 array( 'ss_row_id' => 1 ), $fname
3538         );
3539
3540         if ( $s === false ) {
3541                 return;
3542         } else {
3543                 $wgTotalViews = $s->ss_total_views;
3544                 $wgTotalEdits = $s->ss_total_edits;
3545                 $wgNumberOfArticles = $s->ss_good_articles;
3546         }
3547 }
3548
3549 /**
3550  * Escape html tags
3551  * Basicly replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
3552  *
3553  * @param string $in Text that might contain HTML tags
3554  * @return string Escaped string
3555  */
3556 function wfEscapeHTMLTagsOnly( $in ) {
3557         return str_replace(
3558                 array( '"', '>', '<' ),
3559                 array( '&quot;', '&gt;', '&lt;' ),
3560                 $in );
3561 }
3562
3563 ?>