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