includes/Parser.php

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