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
 115         /**#@-*/
 116
 117         /**
 118          * Constructor
 119          *
 120          * @access public
 121          */
 122         function Parser() {
 123                 $this->mTemplates = array();
 124                 $this->mTemplatePath = array();
 125                 $this->mTagHooks = array();
 126                 $this->clearState();
 127         }
 128
 129         /**
 130          * Clear Parser state
 131          *
 132          * @access private
 133          */
 134         function clearState() {
 135                 $this->mOutput = new ParserOutput;
 136                 $this->mAutonumber = 0;
 137                 $this->mLastSection = '';
 138                 $this->mDTopen = false;
 139                 $this->mVariables = false;
 140                 $this->mIncludeCount = array();
 141                 $this->mStripState = array();
 142                 $this->mArgStack = array();
 143                 $this->mInPre = false;
 144                 $this->mInterwikiLinkHolders = array(
 145                         'texts' => array(),
 146                         'titles' => array()
 147                 );
 148                 $this->mLinkHolders = array(
 149                         'namespaces' => array(),
 150                         'dbkeys' => array(),
 151                         'queries' => array(),
 152                         'texts' => array(),
 153                         'titles' => array()
 154                 );
 155         }
 156
 157         /**
 158          * First pass--just handle <nowiki> sections, pass the rest off
 159          * to internalParse() which does all the real work.
 160          *
 161          * @access private
 162          * @param string $text Text we want to parse
 163          * @param Title &$title A title object
 164          * @param array $options
 165          * @param boolean $linestart
 166          * @param boolean $clearState
 167          * @return ParserOutput a ParserOutput
 168          */
 169         function parse( $text, &$title, $options, $linestart = true, $clearState = true ) {
 170                 global $wgUseTidy, $wgContLang;
 171                 $fname = 'Parser::parse';
 172                 wfProfileIn( $fname );
 173
 174                 if ( $clearState ) {
 175                         $this->clearState();
 176                 }
 177
 178                 $this->mOptions = $options;
 179                 $this->mTitle =& $title;
 180                 $this->mOutputType = OT_HTML;
 181
 182                 $this->mStripState = NULL;
 183
 184                 //$text = $this->strip( $text, $this->mStripState );
 185                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 186                 $x =& $this->mStripState;
 187
 188                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 189                 $text = $this->strip( $text, $x );
 190                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 191
 192                 $text = $this->internalParse( $text );
 193
 194                 $text = $this->unstrip( $text, $this->mStripState );
 195
 196                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 197                 $fixtags = array(
 198                         # french spaces, last one Guillemet-left
 199                         # only if there is something before the space
 200                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 201                         # french spaces, Guillemet-right
 202                         '/(\\302\\253) /' => '\\1&nbsp;',
 203                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 204                 );
 205                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 206
 207                 # only once and last
 208                 $text = $this->doBlockLevels( $text, $linestart );
 209
 210                 $this->replaceLinkHolders( $text );
 211
 212                 # the position of the convert() call should not be changed. it
 213                 # assumes that the links are all replaces and the only thing left
 214                 # is the <nowiki> mark.
 215                 $text = $wgContLang->convert($text);
 216                 $this->mOutput->setTitleText($wgContLang->getParsedTitle());
 217
 218                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 219
 220                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 221
 222                 $text = Sanitizer::normalizeCharReferences( $text );
 223
 224                 if ($wgUseTidy) {
 225                         $text = Parser::tidy($text);
 226                 }
 227
 228                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 229
 230                 $this->mOutput->setText( $text );
 231                 wfProfileOut( $fname );
 232                 return $this->mOutput;
 233         }
 234
 235         /**
 236          * Get a random string
 237          *
 238          * @access private
 239          * @static
 240          */
 241         function getRandomString() {
 242                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 243         }
 244
 245         /**
 246          * Replaces all occurrences of <$tag>content</$tag> in the text
 247          * with a random marker and returns the new text. the output parameter
 248          * $content will be an associative array filled with data on the form
 249          * $unique_marker => content.
 250          *
 251          * If $content is already set, the additional entries will be appended
 252          * If $tag is set to STRIP_COMMENTS, the function will extract
 253          * <!-- HTML comments -->
 254          *
 255          * @access private
 256          * @static
 257          */
 258         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 259                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 260                 if ( !$content ) {
 261                         $content = array( );
 262                 }
 263                 $n = 1;
 264                 $stripped = '';
 265
 266                 if ( !$tags ) {
 267                         $tags = array( );
 268                 }
 269
 270                 if ( !$params ) {
 271                         $params = array( );
 272                 }
 273
 274                 if( $tag == STRIP_COMMENTS ) {
 275                         $start = '/<!--()/';
 276                         $end   = '/-->/';
 277                 } else {
 278                         $start = "/<$tag(\\s+[^>]*|\\s*)>/i";
 279                         $end   = "/<\\/$tag\\s*>/i";
 280                 }
 281
 282                 while ( '' != $text ) {
 283                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 284                         $stripped .= $p[0];
 285                         if( count( $p ) < 3 ) {
 286                                 break;
 287                         }
 288                         $attributes = $p[1];
 289                         $inside     = $p[2];
 290
 291                         $marker = $rnd . sprintf('%08X', $n++);
 292                         $stripped .= $marker;
 293
 294                         $tags[$marker] = "<$tag$attributes>";
 295                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 296
 297                         $q = preg_split( $end, $inside, 2 );
 298                         $content[$marker] = $q[0];
 299                         if( count( $q ) < 2 ) {
 300                                 # No end tag -- let it run out to the end of the text.
 301                                 break;
 302                         } else {
 303                                 $text = $q[1];
 304                         }
 305                 }
 306                 return $stripped;
 307         }
 308
 309         /**
 310          * Wrapper function for extractTagsAndParams
 311          * for cases where $tags and $params isn't needed
 312          * i.e. where tags will never have params, like <nowiki>
 313          *
 314          * @access private
 315          * @static
 316          */
 317         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 318                 $dummy_tags = array();
 319                 $dummy_params = array();
 320
 321                 return Parser::extractTagsAndParams( $tag, $text, $content,
 322                         $dummy_tags, $dummy_params, $uniq_prefix );
 323         }
 324
 325         /**
 326          * Strips and renders nowiki, pre, math, hiero
 327          * If $render is set, performs necessary rendering operations on plugins
 328          * Returns the text, and fills an array with data needed in unstrip()
 329          * If the $state is already a valid strip state, it adds to the state
 330          *
 331          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 332          *  will be stripped in addition to other tags. This is important
 333          *  for section editing, where these comments cause confusion when
 334          *  counting the sections in the wikisource
 335          *
 336          * @access private
 337          */
 338         function strip( $text, &$state, $stripcomments = false ) {
 339                 $render = ($this->mOutputType == OT_HTML);
 340                 $html_content = array();
 341                 $nowiki_content = array();
 342                 $math_content = array();
 343                 $pre_content = array();
 344                 $comment_content = array();
 345                 $ext_content = array();
 346                 $ext_tags = array();
 347                 $ext_params = array();
 348                 $gallery_content = array();
 349
 350                 # Replace any instances of the placeholders
 351                 $uniq_prefix = UNIQ_PREFIX;
 352                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 353
 354                 # html
 355                 global $wgRawHtml;
 356                 if( $wgRawHtml ) {
 357                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 358                         foreach( $html_content as $marker => $content ) {
 359                                 if ($render ) {
 360                                         # Raw and unchecked for validity.
 361                                         $html_content[$marker] = $content;
 362                                 } else {
 363                                         $html_content[$marker] = '<html>'.$content.'</html>';
 364                                 }
 365                         }
 366                 }
 367
 368                 # nowiki
 369                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 370                 foreach( $nowiki_content as $marker => $content ) {
 371                         if( $render ){
 372                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 373                         } else {
 374                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 375                         }
 376                 }
 377
 378                 # math
 379                 if( $this->mOptions->getUseTeX() ) {
 380                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 381                         foreach( $math_content as $marker => $content ){
 382                                 if( $render ) {
 383                                         $math_content[$marker] = renderMath( $content );
 384                                 } else {
 385                                         $math_content[$marker] = '<math>'.$content.'</math>';
 386                                 }
 387                         }
 388                 }
 389
 390                 # pre
 391                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 392                 foreach( $pre_content as $marker => $content ){
 393                         if( $render ){
 394                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 395                         } else {
 396                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 397                         }
 398                 }
 399
 400                 # gallery
 401                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 402                 foreach( $gallery_content as $marker => $content ) {
 403                         require_once( 'ImageGallery.php' );
 404                         if ( $render ) {
 405                                 $gallery_content[$marker] = Parser::renderImageGallery( $content );
 406                         } else {
 407                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 408                         }
 409                 }
 410
 411                 # Comments
 412                 if($stripcomments) {
 413                         $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 414                         foreach( $comment_content as $marker => $content ){
 415                                 $comment_content[$marker] = '<!--'.$content.'-->';
 416                         }
 417                 }
 418
 419                 # Extensions
 420                 foreach ( $this->mTagHooks as $tag => $callback ) {
 421                         $ext_content[$tag] = array();
 422                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 423                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 424                         foreach( $ext_content[$tag] as $marker => $content ) {
 425                                 $full_tag = $ext_tags[$tag][$marker];
 426                                 $params = $ext_params[$tag][$marker];
 427                                 if ( $render ) {
 428                                         $ext_content[$tag][$marker] = $callback( $content, $params, $this );
 429                                 } else {
 430                                         $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 431                                 }
 432                         }
 433                 }
 434
 435                 # Merge state with the pre-existing state, if there is one
 436                 if ( $state ) {
 437                         $state['html'] = $state['html'] + $html_content;
 438                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 439                         $state['math'] = $state['math'] + $math_content;
 440                         $state['pre'] = $state['pre'] + $pre_content;
 441                         $state['comment'] = $state['comment'] + $comment_content;
 442                         $state['gallery'] = $state['gallery'] + $gallery_content;
 443
 444                         foreach( $ext_content as $tag => $array ) {
 445                                 if ( array_key_exists( $tag, $state ) ) {
 446                                         $state[$tag] = $state[$tag] + $array;
 447                                 }
 448                         }
 449                 } else {
 450                         $state = array(
 451                           'html' => $html_content,
 452                           'nowiki' => $nowiki_content,
 453                           'math' => $math_content,
 454                           'pre' => $pre_content,
 455                           'comment' => $comment_content,
 456                           'gallery' => $gallery_content,
 457                         ) + $ext_content;
 458                 }
 459                 return $text;
 460         }
 461
 462         /**
 463          * restores pre, math, and hiero removed by strip()
 464          *
 465          * always call unstripNoWiki() after this one
 466          * @access private
 467          */
 468         function unstrip( $text, &$state ) {
 469                 if ( !is_array( $state ) ) {
 470                         return $text;
 471                 }
 472
 473                 # Must expand in reverse order, otherwise nested tags will be corrupted
 474                 $contentDict = end( $state );
 475                 for ( $contentDict = end( $state ); $contentDict !== false; $contentDict = prev( $state ) ) {
 476                         if( key($state) != 'nowiki' && key($state) != 'html') {
 477                                 for ( $content = end( $contentDict ); $content !== false; $content = prev( $contentDict ) ) {
 478                                         $text = str_replace( key( $contentDict ), $content, $text );
 479                                 }
 480                         }
 481                 }
 482
 483                 return $text;
 484         }
 485
 486         /**
 487          * always call this after unstrip() to preserve the order
 488          *
 489          * @access private
 490          */
 491         function unstripNoWiki( $text, &$state ) {
 492                 if ( !is_array( $state ) ) {
 493                         return $text;
 494                 }
 495
 496                 # Must expand in reverse order, otherwise nested tags will be corrupted
 497                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 498                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 499                 }
 500
 501                 global $wgRawHtml;
 502                 if ($wgRawHtml) {
 503                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 504                                 $text = str_replace( key( $state['html'] ), $content, $text );
 505                         }
 506                 }
 507
 508                 return $text;
 509         }
 510
 511         /**
 512          * Add an item to the strip state
 513          * Returns the unique tag which must be inserted into the stripped text
 514          * The tag will be replaced with the original text in unstrip()
 515          *
 516          * @access private
 517          */
 518         function insertStripItem( $text, &$state ) {
 519                 $rnd = UNIQ_PREFIX . '-item' . Parser::getRandomString();
 520                 if ( !$state ) {
 521                         $state = array(
 522                           'html' => array(),
 523                           'nowiki' => array(),
 524                           'math' => array(),
 525                           'pre' => array(),
 526                           'comment' => array(),
 527                           'gallery' => array(),
 528                         );
 529                 }
 530                 $state['item'][$rnd] = $text;
 531                 return $rnd;
 532         }
 533
 534         /**
 535          * Interface with html tidy, used if $wgUseTidy = true.
 536          * If tidy isn't able to correct the markup, the original will be
 537          * returned in all its glory with a warning comment appended.
 538          *
 539          * Either the external tidy program or the in-process tidy extension
 540          * will be used depending on availability. Override the default
 541          * $wgTidyInternal setting to disable the internal if it's not working.
 542          *
 543          * @param string $text Hideous HTML input
 544          * @return string Corrected HTML output
 545          * @access public
 546          * @static
 547          */
 548         function tidy( $text ) {
 549                 global $wgTidyInternal;
 550                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 551 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 552 '<head><title>test</title></head><body>'.$text.'</body></html>';
 553                 if( $wgTidyInternal ) {
 554                         $correctedtext = Parser::internalTidy( $wrappedtext );
 555                 } else {
 556                         $correctedtext = Parser::externalTidy( $wrappedtext );
 557                 }
 558                 if( is_null( $correctedtext ) ) {
 559                         wfDebug( "Tidy error detected!\n" );
 560                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 561                 }
 562                 return $correctedtext;
 563         }
 564
 565         /**
 566          * Spawn an external HTML tidy process and get corrected markup back from it.
 567          *
 568          * @access private
 569          * @static
 570          */
 571         function externalTidy( $text ) {
 572                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 573                 $fname = 'Parser::externalTidy';
 574                 wfProfileIn( $fname );
 575
 576                 $cleansource = '';
 577                 $opts = ' -utf8';
 578
 579                 $descriptorspec = array(
 580                         0 => array('pipe', 'r'),
 581                         1 => array('pipe', 'w'),
 582                         2 => array('file', '/dev/null', 'a')
 583                 );
 584                 $pipes = array();
 585                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 586                 if (is_resource($process)) {
 587                         fwrite($pipes[0], $text);
 588                         fclose($pipes[0]);
 589                         while (!feof($pipes[1])) {
 590                                 $cleansource .= fgets($pipes[1], 1024);
 591                         }
 592                         fclose($pipes[1]);
 593                         proc_close($process);
 594                 }
 595
 596                 wfProfileOut( $fname );
 597
 598                 if( $cleansource == '' && $text != '') {
 599                         // Some kind of error happened, so we couldn't get the corrected text.
 600                         // Just give up; we'll use the source text and append a warning.
 601                         return null;
 602                 } else {
 603                         return $cleansource;
 604                 }
 605         }
 606
 607         /**
 608          * Use the HTML tidy PECL extension to use the tidy library in-process,
 609          * saving the overhead of spawning a new process. Currently written to
 610          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 611          *
 612          * 'pear install tidy' should be able to compile the extension module.
 613          *
 614          * @access private
 615          * @static
 616          */
 617         function internalTidy( $text ) {
 618                 global $wgTidyConf;
 619                 $fname = 'Parser::internalTidy';
 620                 wfProfileIn( $fname );
 621
 622                 tidy_load_config( $wgTidyConf );
 623                 tidy_set_encoding( 'utf8' );
 624                 tidy_parse_string( $text );
 625                 tidy_clean_repair();
 626                 if( tidy_get_status() == 2 ) {
 627                         // 2 is magic number for fatal error
 628                         // http://www.php.net/manual/en/function.tidy-get-status.php
 629                         $cleansource = null;
 630                 } else {
 631                         $cleansource = tidy_get_output();
 632                 }
 633                 wfProfileOut( $fname );
 634                 return $cleansource;
 635         }
 636
 637         /**
 638          * parse the wiki syntax used to render tables
 639          *
 640          * @access private
 641          */
 642         function doTableStuff ( $t ) {
 643                 $fname = 'Parser::doTableStuff';
 644                 wfProfileIn( $fname );
 645
 646                 $t = explode ( "\n" , $t ) ;
 647                 $td = array () ; # Is currently a td tag open?
 648                 $ltd = array () ; # Was it TD or TH?
 649                 $tr = array () ; # Is currently a tr tag open?
 650                 $ltr = array () ; # tr attributes
 651                 $indent_level = 0; # indent level of the table
 652                 foreach ( $t AS $k => $x )
 653                 {
 654                         $x = trim ( $x ) ;
 655                         $fc = substr ( $x , 0 , 1 ) ;
 656                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 657                                 $indent_level = strlen( $matches[1] );
 658
 659                                 $attributes = $this->unstripForHTML( $matches[2] );
 660
 661                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 662                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 663                                 array_push ( $td , false ) ;
 664                                 array_push ( $ltd , '' ) ;
 665                                 array_push ( $tr , false ) ;
 666                                 array_push ( $ltr , '' ) ;
 667                         }
 668                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 669                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 670                                 $z = "</table>" . substr ( $x , 2);
 671                                 $l = array_pop ( $ltd ) ;
 672                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 673                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 674                                 array_pop ( $ltr ) ;
 675                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 676                         }
 677                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 678                                 $x = substr ( $x , 1 ) ;
 679                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 680                                 $z = '' ;
 681                                 $l = array_pop ( $ltd ) ;
 682                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 683                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 684                                 array_pop ( $ltr ) ;
 685                                 $t[$k] = $z ;
 686                                 array_push ( $tr , false ) ;
 687                                 array_push ( $td , false ) ;
 688                                 array_push ( $ltd , '' ) ;
 689                                 $attributes = $this->unstripForHTML( $x );
 690                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, '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 {
 733                                                 $attributes = $this->unstripForHTML( $y[0] );
 734                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 735                                         }
 736                                         $t[$k] .= $y ;
 737                                         array_push ( $td , true ) ;
 738                                 }
 739                         }
 740                 }
 741
 742                 # Closing open td, tr && table
 743                 while ( count ( $td ) > 0 )
 744                 {
 745                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 746                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 747                         $t[] = '</table>' ;
 748                 }
 749
 750                 $t = implode ( "\n" , $t ) ;
 751                 wfProfileOut( $fname );
 752                 return $t ;
 753         }
 754
 755         /**
 756          * Helper function for parse() that transforms wiki markup into
 757          * HTML. Only called for $mOutputType == OT_HTML.
 758          *
 759          * @access private
 760          */
 761         function internalParse( $text ) {
 762                 global $wgContLang;
 763                 $args = array();
 764                 $isMain = true;
 765                 $fname = 'Parser::internalParse';
 766                 wfProfileIn( $fname );
 767
 768                 # Remove <noinclude> tags and <includeonly> sections
 769                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 770                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 771
 772                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 773                 $text = $this->replaceVariables( $text, $args );
 774
 775                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 776
 777                 $text = $this->doHeadings( $text );
 778                 if($this->mOptions->getUseDynamicDates()) {
 779                         $df =& DateFormatter::getInstance();
 780                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 781                 }
 782                 $text = $this->doAllQuotes( $text );
 783                 $text = $this->replaceInternalLinks( $text );
 784                 $text = $this->replaceExternalLinks( $text );
 785
 786                 # replaceInternalLinks may sometimes leave behind
 787                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 788                 $text = str_replace(UNIQ_PREFIX."NOPARSE", "", $text);
 789
 790                 $text = $this->doMagicLinks( $text );
 791                 $text = $this->doTableStuff( $text );
 792                 $text = $this->formatHeadings( $text, $isMain );
 793
 794                 $regex = '/<!--IW_TRANSCLUDE (\d+)-->/';
 795                 $text = preg_replace_callback($regex, array(&$this, 'scarySubstitution'), $text);
 796
 797                 wfProfileOut( $fname );
 798                 return $text;
 799         }
 800
 801         function scarySubstitution($matches) {
 802 #               return "[[".$matches[0]."]]";
 803                 return $this->mIWTransData[(int)$matches[0]];
 804         }
 805
 806         /**
 807          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 808          * magic external links.
 809          *
 810          * @access private
 811          */
 812         function &doMagicLinks( &$text ) {
 813                 $text = $this->magicISBN( $text );
 814                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 815                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 816                 return $text;
 817         }
 818
 819         /**
 820          * Parse ^^ tokens and return html
 821          *
 822          * @access private
 823          */
 824         function doExponent( $text ) {
 825                 $fname = 'Parser::doExponent';
 826                 wfProfileIn( $fname );
 827                 $text = preg_replace('/\^\^(.*?)\^\^/','<small><sup>\\1</sup></small>', $text);
 828                 wfProfileOut( $fname );
 829                 return $text;
 830         }
 831
 832         /**
 833          * Parse headers and return html
 834          *
 835          * @access private
 836          */
 837         function doHeadings( $text ) {
 838                 $fname = 'Parser::doHeadings';
 839                 wfProfileIn( $fname );
 840                 for ( $i = 6; $i >= 1; --$i ) {
 841                         $h = substr( '======', 0, $i );
 842                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 843                           "<h{$i}>\\1</h{$i}>\\2", $text );
 844                 }
 845                 wfProfileOut( $fname );
 846                 return $text;
 847         }
 848
 849         /**
 850          * Replace single quotes with HTML markup
 851          * @access private
 852          * @return string the altered text
 853          */
 854         function doAllQuotes( $text ) {
 855                 $fname = 'Parser::doAllQuotes';
 856                 wfProfileIn( $fname );
 857                 $outtext = '';
 858                 $lines = explode( "\n", $text );
 859                 foreach ( $lines as $line ) {
 860                         $outtext .= $this->doQuotes ( $line ) . "\n";
 861                 }
 862                 $outtext = substr($outtext, 0,-1);
 863                 wfProfileOut( $fname );
 864                 return $outtext;
 865         }
 866
 867         /**
 868          * Helper function for doAllQuotes()
 869          * @access private
 870          */
 871         function doQuotes( $text ) {
 872                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 873                 if ( count( $arr ) == 1 )
 874                         return $text;
 875                 else
 876                 {
 877                         # First, do some preliminary work. This may shift some apostrophes from
 878                         # being mark-up to being text. It also counts the number of occurrences
 879                         # of bold and italics mark-ups.
 880                         $i = 0;
 881                         $numbold = 0;
 882                         $numitalics = 0;
 883                         foreach ( $arr as $r )
 884                         {
 885                                 if ( ( $i % 2 ) == 1 )
 886                                 {
 887                                         # If there are ever four apostrophes, assume the first is supposed to
 888                                         # be text, and the remaining three constitute mark-up for bold text.
 889                                         if ( strlen( $arr[$i] ) == 4 )
 890                                         {
 891                                                 $arr[$i-1] .= "'";
 892                                                 $arr[$i] = "'''";
 893                                         }
 894                                         # If there are more than 5 apostrophes in a row, assume they're all
 895                                         # text except for the last 5.
 896                                         else if ( strlen( $arr[$i] ) > 5 )
 897                                         {
 898                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 899                                                 $arr[$i] = "'''''";
 900                                         }
 901                                         # Count the number of occurrences of bold and italics mark-ups.
 902                                         # We are not counting sequences of five apostrophes.
 903                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 904                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 905                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 906                                 }
 907                                 $i++;
 908                         }
 909
 910                         # If there is an odd number of both bold and italics, it is likely
 911                         # that one of the bold ones was meant to be an apostrophe followed
 912                         # by italics. Which one we cannot know for certain, but it is more
 913                         # likely to be one that has a single-letter word before it.
 914                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 915                         {
 916                                 $i = 0;
 917                                 $firstsingleletterword = -1;
 918                                 $firstmultiletterword = -1;
 919                                 $firstspace = -1;
 920                                 foreach ( $arr as $r )
 921                                 {
 922                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 923                                         {
 924                                                 $x1 = substr ($arr[$i-1], -1);
 925                                                 $x2 = substr ($arr[$i-1], -2, 1);
 926                                                 if ($x1 == ' ') {
 927                                                         if ($firstspace == -1) $firstspace = $i;
 928                                                 } else if ($x2 == ' ') {
 929                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 930                                                 } else {
 931                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 932                                                 }
 933                                         }
 934                                         $i++;
 935                                 }
 936
 937                                 # If there is a single-letter word, use it!
 938                                 if ($firstsingleletterword > -1)
 939                                 {
 940                                         $arr [ $firstsingleletterword ] = "''";
 941                                         $arr [ $firstsingleletterword-1 ] .= "'";
 942                                 }
 943                                 # If not, but there's a multi-letter word, use that one.
 944                                 else if ($firstmultiletterword > -1)
 945                                 {
 946                                         $arr [ $firstmultiletterword ] = "''";
 947                                         $arr [ $firstmultiletterword-1 ] .= "'";
 948                                 }
 949                                 # ... otherwise use the first one that has neither.
 950                                 # (notice that it is possible for all three to be -1 if, for example,
 951                                 # there is only one pentuple-apostrophe in the line)
 952                                 else if ($firstspace > -1)
 953                                 {
 954                                         $arr [ $firstspace ] = "''";
 955                                         $arr [ $firstspace-1 ] .= "'";
 956                                 }
 957                         }
 958
 959                         # Now let's actually convert our apostrophic mush to HTML!
 960                         $output = '';
 961                         $buffer = '';
 962                         $state = '';
 963                         $i = 0;
 964                         foreach ($arr as $r)
 965                         {
 966                                 if (($i % 2) == 0)
 967                                 {
 968                                         if ($state == 'both')
 969                                                 $buffer .= $r;
 970                                         else
 971                                                 $output .= $r;
 972                                 }
 973                                 else
 974                                 {
 975                                         if (strlen ($r) == 2)
 976                                         {
 977                                                 if ($state == 'i')
 978                                                 { $output .= '</i>'; $state = ''; }
 979                                                 else if ($state == 'bi')
 980                                                 { $output .= '</i>'; $state = 'b'; }
 981                                                 else if ($state == 'ib')
 982                                                 { $output .= '</b></i><b>'; $state = 'b'; }
 983                                                 else if ($state == 'both')
 984                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
 985                                                 else # $state can be 'b' or ''
 986                                                 { $output .= '<i>'; $state .= 'i'; }
 987                                         }
 988                                         else if (strlen ($r) == 3)
 989                                         {
 990                                                 if ($state == 'b')
 991                                                 { $output .= '</b>'; $state = ''; }
 992                                                 else if ($state == 'bi')
 993                                                 { $output .= '</i></b><i>'; $state = 'i'; }
 994                                                 else if ($state == 'ib')
 995                                                 { $output .= '</b>'; $state = 'i'; }
 996                                                 else if ($state == 'both')
 997                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
 998                                                 else # $state can be 'i' or ''
 999                                                 { $output .= '<b>'; $state .= 'b'; }
1000                                         }
1001                                         else if (strlen ($r) == 5)
1002                                         {
1003                                                 if ($state == 'b')
1004                                                 { $output .= '</b><i>'; $state = 'i'; }
1005                                                 else if ($state == 'i')
1006                                                 { $output .= '</i><b>'; $state = 'b'; }
1007                                                 else if ($state == 'bi')
1008                                                 { $output .= '</i></b>'; $state = ''; }
1009                                                 else if ($state == 'ib')
1010                                                 { $output .= '</b></i>'; $state = ''; }
1011                                                 else if ($state == 'both')
1012                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1013                                                 else # ($state == '')
1014                                                 { $buffer = ''; $state = 'both'; }
1015                                         }
1016                                 }
1017                                 $i++;
1018                         }
1019                         # Now close all remaining tags.  Notice that the order is important.
1020                         if ($state == 'b' || $state == 'ib')
1021                                 $output .= '</b>';
1022                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1023                                 $output .= '</i>';
1024                         if ($state == 'bi')
1025                                 $output .= '</b>';
1026                         if ($state == 'both')
1027                                 $output .= '<b><i>'.$buffer.'</i></b>';
1028                         return $output;
1029                 }
1030         }
1031
1032         /**
1033          * Replace external links
1034          *
1035          * Note: this is all very hackish and the order of execution matters a lot.
1036          * Make sure to run maintenance/parserTests.php if you change this code.
1037          *
1038          * @access private
1039          */
1040         function replaceExternalLinks( $text ) {
1041                 global $wgContLang;
1042                 $fname = 'Parser::replaceExternalLinks';
1043                 wfProfileIn( $fname );
1044
1045                 $sk =& $this->mOptions->getSkin();
1046
1047                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1048
1049                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1050
1051                 $i = 0;
1052                 while ( $i<count( $bits ) ) {
1053                         $url = $bits[$i++];
1054                         $protocol = $bits[$i++];
1055                         $text = $bits[$i++];
1056                         $trail = $bits[$i++];
1057
1058                         # The characters '<' and '>' (which were escaped by
1059                         # removeHTMLtags()) should not be included in
1060                         # URLs, per RFC 2396.
1061                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1062                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1063                                 $url = substr($url, 0, $m2[0][1]);
1064                         }
1065
1066                         # If the link text is an image URL, replace it with an <img> tag
1067                         # This happened by accident in the original parser, but some people used it extensively
1068                         $img = $this->maybeMakeExternalImage( $text );
1069                         if ( $img !== false ) {
1070                                 $text = $img;
1071                         }
1072
1073                         $dtrail = '';
1074
1075                         # Set linktype for CSS - if URL==text, link is essentially free
1076                         $linktype = ($text == $url) ? 'free' : 'text';
1077
1078                         # No link text, e.g. [http://domain.tld/some.link]
1079                         if ( $text == '' ) {
1080                                 # Autonumber if allowed
1081                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1082                                         $text = '[' . ++$this->mAutonumber . ']';
1083                                         $linktype = 'autonumber';
1084                                 } else {
1085                                         # Otherwise just use the URL
1086                                         $text = htmlspecialchars( $url );
1087                                         $linktype = 'free';
1088                                 }
1089                         } else {
1090                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1091                                 # Check for trail
1092                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1093                         }
1094
1095                         $text = $wgContLang->markNoConversion($text);
1096
1097                         # Replace &amp; from obsolete syntax with &.
1098                         # All HTML entities will be escaped by makeExternalLink()
1099                         # or maybeMakeExternalImage()
1100                         $url = str_replace( '&amp;', '&', $url );
1101
1102                         # Process the trail (i.e. everything after this link up until start of the next link),
1103                         # replacing any non-bracketed links
1104                         $trail = $this->replaceFreeExternalLinks( $trail );
1105
1106
1107                         # Use the encoded URL
1108                         # This means that users can paste URLs directly into the text
1109                         # Funny characters like &ouml; aren't valid in URLs anyway
1110                         # This was changed in August 2004
1111                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1112                 }
1113
1114                 wfProfileOut( $fname );
1115                 return $s;
1116         }
1117
1118         /**
1119          * Replace anything that looks like a URL with a link
1120          * @access private
1121          */
1122         function replaceFreeExternalLinks( $text ) {
1123                 global $wgUrlProtocols;
1124                 global $wgContLang;
1125                 $fname = 'Parser::replaceFreeExternalLinks';
1126                 wfProfileIn( $fname );
1127
1128                 $bits = preg_split( '/(\b(?:'.$wgUrlProtocols.'))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1129                 $s = array_shift( $bits );
1130                 $i = 0;
1131
1132                 $sk =& $this->mOptions->getSkin();
1133
1134                 while ( $i < count( $bits ) ){
1135                         $protocol = $bits[$i++];
1136                         $remainder = $bits[$i++];
1137
1138                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1139                                 # Found some characters after the protocol that look promising
1140                                 $url = $protocol . $m[1];
1141                                 $trail = $m[2];
1142
1143                                 # The characters '<' and '>' (which were escaped by
1144                                 # removeHTMLtags()) should not be included in
1145                                 # URLs, per RFC 2396.
1146                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1147                                         $trail = substr($url, $m2[0][1]) . $trail;
1148                                         $url = substr($url, 0, $m2[0][1]);
1149                                 }
1150
1151                                 # Move trailing punctuation to $trail
1152                                 $sep = ',;\.:!?';
1153                                 # If there is no left bracket, then consider right brackets fair game too
1154                                 if ( strpos( $url, '(' ) === false ) {
1155                                         $sep .= ')';
1156                                 }
1157
1158                                 $numSepChars = strspn( strrev( $url ), $sep );
1159                                 if ( $numSepChars ) {
1160                                         $trail = substr( $url, -$numSepChars ) . $trail;
1161                                         $url = substr( $url, 0, -$numSepChars );
1162                                 }
1163
1164                                 # Replace &amp; from obsolete syntax with &.
1165                                 # All HTML entities will be escaped by makeExternalLink()
1166                                 # or maybeMakeExternalImage()
1167                                 $url = str_replace( '&amp;', '&', $url );
1168
1169                                 # Is this an external image?
1170                                 $text = $this->maybeMakeExternalImage( $url );
1171                                 if ( $text === false ) {
1172                                         # Not an image, make a link
1173                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1174                                 }
1175                                 $s .= $text . $trail;
1176                         } else {
1177                                 $s .= $protocol . $remainder;
1178                         }
1179                 }
1180                 wfProfileOut( $fname );
1181                 return $s;
1182         }
1183
1184         /**
1185          * make an image if it's allowed
1186          * @access private
1187          */
1188         function maybeMakeExternalImage( $url ) {
1189                 $sk =& $this->mOptions->getSkin();
1190                 $text = false;
1191                 if ( $this->mOptions->getAllowExternalImages() ) {
1192                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1193                                 # Image found
1194                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1195                         }
1196                 }
1197                 return $text;
1198         }
1199
1200         /**
1201          * Process [[ ]] wikilinks
1202          *
1203          * @access private
1204          */
1205         function replaceInternalLinks( $s ) {
1206                 global $wgContLang, $wgLinkCache, $wgUrlProtocols;
1207                 static $fname = 'Parser::replaceInternalLinks' ;
1208
1209                 wfProfileIn( $fname );
1210
1211                 wfProfileIn( $fname.'-setup' );
1212                 static $tc = FALSE;
1213                 # the % is needed to support urlencoded titles as well
1214                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1215
1216                 $sk =& $this->mOptions->getSkin();
1217
1218                 #split the entire text string on occurences of [[
1219                 $a = explode( '[[', ' ' . $s );
1220                 #get the first element (all text up to first [[), and remove the space we added
1221                 $s = array_shift( $a );
1222                 $s = substr( $s, 1 );
1223
1224                 # Match a link having the form [[namespace:link|alternate]]trail
1225                 static $e1 = FALSE;
1226                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1227                 # Match cases where there is no "]]", which might still be images
1228                 static $e1_img = FALSE;
1229                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1230                 # Match the end of a line for a word that's not followed by whitespace,
1231                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1232                 $e2 = wfMsgForContent( 'linkprefix' );
1233
1234                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1235
1236                 if( is_null( $this->mTitle ) ) {
1237                         wfDebugDieBacktrace( 'nooo' );
1238                 }
1239                 $nottalk = !$this->mTitle->isTalkPage();
1240
1241                 if ( $useLinkPrefixExtension ) {
1242                         if ( preg_match( $e2, $s, $m ) ) {
1243                                 $first_prefix = $m[2];
1244                         } else {
1245                                 $first_prefix = false;
1246                         }
1247                 } else {
1248                         $prefix = '';
1249                 }
1250
1251                 $selflink = $this->mTitle->getPrefixedText();
1252                 wfProfileOut( $fname.'-setup' );
1253
1254                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1255                 $useSubpages = $this->areSubpagesAllowed();
1256
1257                 # Loop for each link
1258                 for ($k = 0; isset( $a[$k] ); $k++) {
1259                         $line = $a[$k];
1260                         if ( $useLinkPrefixExtension ) {
1261                                 wfProfileIn( $fname.'-prefixhandling' );
1262                                 if ( preg_match( $e2, $s, $m ) ) {
1263                                         $prefix = $m[2];
1264                                         $s = $m[1];
1265                                 } else {
1266                                         $prefix='';
1267                                 }
1268                                 # first link
1269                                 if($first_prefix) {
1270                                         $prefix = $first_prefix;
1271                                         $first_prefix = false;
1272                                 }
1273                                 wfProfileOut( $fname.'-prefixhandling' );
1274                         }
1275
1276                         $might_be_img = false;
1277
1278                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1279                                 $text = $m[2];
1280                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1281                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1282                                 # the real problem is with the $e1 regex
1283                                 # See bug 1300.
1284                                 #
1285                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1286                                 # and no image is in sight. See bug 2095.
1287                                 #
1288                                 if( $text !== '' && preg_match( "/^\](.*)/s", $m[3], $n ) ) {
1289                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1290                                         $m[3] = $n[1];
1291                                 }
1292                                 # fix up urlencoded title texts
1293                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1294                                 $trail = $m[3];
1295                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1296                                 $might_be_img = true;
1297                                 $text = $m[2];
1298                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1299                                 $trail = "";
1300                         } else { # Invalid form; output directly
1301                                 $s .= $prefix . '[[' . $line ;
1302                                 continue;
1303                         }
1304
1305                         # Don't allow internal links to pages containing
1306                         # PROTO: where PROTO is a valid URL protocol; these
1307                         # should be external links.
1308                         if (preg_match('/^(\b(?:'.$wgUrlProtocols.'))/', $m[1])) {
1309                                 $s .= $prefix . '[[' . $line ;
1310                                 continue;
1311                         }
1312
1313                         # Make subpage if necessary
1314                         if( $useSubpages ) {
1315                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1316                         } else {
1317                                 $link = $m[1];
1318                         }
1319
1320                         $noforce = (substr($m[1], 0, 1) != ':');
1321                         if (!$noforce) {
1322                                 # Strip off leading ':'
1323                                 $link = substr($link, 1);
1324                         }
1325
1326                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1327                         if( !$nt ) {
1328                                 $s .= $prefix . '[[' . $line;
1329                                 continue;
1330                         }
1331
1332                         #check other language variants of the link
1333                         #if the article does not exist
1334                         if( $checkVariantLink
1335                             && $nt->getArticleID() == 0 ) {
1336                                 $wgContLang->findVariantLink($link, $nt);
1337                         }
1338
1339                         $ns = $nt->getNamespace();
1340                         $iw = $nt->getInterWiki();
1341
1342                         if ($might_be_img) { # if this is actually an invalid link
1343                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1344                                         $found = false;
1345                                         while (isset ($a[$k+1]) ) {
1346                                                 #look at the next 'line' to see if we can close it there
1347                                                 $spliced = array_splice( $a, $k + 1, 1 );
1348                                                 $next_line = array_shift( $spliced );
1349                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1350                                                 # the first ]] closes the inner link, the second the image
1351                                                         $found = true;
1352                                                         $text .= '[[' . $m[1];
1353                                                         $trail = $m[2];
1354                                                         break;
1355                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1356                                                         #if there's exactly one ]] that's fine, we'll keep looking
1357                                                         $text .= '[[' . $m[0];
1358                                                 } else {
1359                                                         #if $next_line is invalid too, we need look no further
1360                                                         $text .= '[[' . $next_line;
1361                                                         break;
1362                                                 }
1363                                         }
1364                                         if ( !$found ) {
1365                                                 # we couldn't find the end of this imageLink, so output it raw
1366                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1367                                                 $text = $this->replaceInternalLinks($text);
1368                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1369                                                 # note: no $trail, because without an end, there *is* no trail
1370                                                 continue;
1371                                         }
1372                                 } else { #it's not an image, so output it raw
1373                                         $s .= $prefix . '[[' . $link . '|' . $text;
1374                                         # note: no $trail, because without an end, there *is* no trail
1375                                         continue;
1376                                 }
1377                         }
1378
1379                         $wasblank = ( '' == $text );
1380                         if( $wasblank ) $text = $link;
1381
1382
1383                         # Link not escaped by : , create the various objects
1384                         if( $noforce ) {
1385
1386                                 # Interwikis
1387                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1388                                         array_push( $this->mOutput->mLanguageLinks, $nt->getFullText() );
1389                                         $s = rtrim($s . "\n");
1390                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1391                                         continue;
1392                                 }
1393
1394                                 if ( $ns == NS_IMAGE ) {
1395                                         wfProfileIn( "$fname-image" );
1396                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1397                                                 # recursively parse links inside the image caption
1398                                                 # actually, this will parse them in any other parameters, too,
1399                                                 # but it might be hard to fix that, and it doesn't matter ATM
1400                                                 $text = $this->replaceExternalLinks($text);
1401                                                 $text = $this->replaceInternalLinks($text);
1402
1403                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1404                                                 $s .= $prefix . preg_replace("/\b($wgUrlProtocols)/", UNIQ_PREFIX."NOPARSE$1", $this->makeImage( $nt, $text) ) . $trail;
1405                                                 $wgLinkCache->addImageLinkObj( $nt );
1406
1407                                                 wfProfileOut( "$fname-image" );
1408                                                 continue;
1409                                         }
1410                                         wfProfileOut( "$fname-image" );
1411
1412                                 }
1413
1414                                 if ( $ns == NS_CATEGORY ) {
1415                                         wfProfileIn( "$fname-category" );
1416                                         $t = $wgContLang->convertHtml( $nt->getText() );
1417                                         $s = rtrim($s . "\n"); # bug 87
1418
1419                                         $wgLinkCache->suspend(); # Don't save in links/brokenlinks
1420                                         $t = $sk->makeLinkObj( $nt, $t, '', '' , $prefix );
1421                                         $wgLinkCache->resume();
1422
1423                                         if ( $wasblank ) {
1424                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1425                                                         $sortkey = $this->mTitle->getText();
1426                                                 } else {
1427                                                         $sortkey = $this->mTitle->getPrefixedText();
1428                                                 }
1429                                         } else {
1430                                                 $sortkey = $text;
1431                                         }
1432                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1433                                         $wgLinkCache->addCategoryLinkObj( $nt, $sortkey );
1434                                         $this->mOutput->addCategoryLink( $t );
1435
1436                                         /**
1437                                          * Strip the whitespace Category links produce, see bug 87
1438                                          * @todo We might want to use trim($tmp, "\n") here.
1439                                          */
1440                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1441
1442                                         wfProfileOut( "$fname-category" );
1443                                         continue;
1444                                 }
1445                         }
1446
1447                         if( ( $nt->getPrefixedText() === $selflink ) &&
1448                             ( $nt->getFragment() === '' ) ) {
1449                                 # Self-links are handled specially; generally de-link and change to bold.
1450                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1451                                 continue;
1452                         }
1453
1454                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1455                         if( $ns == NS_MEDIA ) {
1456                                 $s .= $prefix . $sk->makeMediaLinkObj( $nt, $text, true ) . $trail;
1457                                 $wgLinkCache->addImageLinkObj( $nt );
1458                                 continue;
1459                         } elseif( $ns == NS_SPECIAL ) {
1460                                 $s .= $prefix . $sk->makeKnownLinkObj( $nt, $text, '', $trail );
1461                                 continue;
1462                         }
1463                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1464                 }
1465                 wfProfileOut( $fname );
1466                 return $s;
1467         }
1468
1469         /**
1470          * Make a link placeholder. The text returned can be later resolved to a real link with
1471          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1472          * parsing of interwiki links, and secondly to allow all extistence checks and
1473          * article length checks (for stub links) to be bundled into a single query.
1474          *
1475          */
1476         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1477                 if ( ! is_object($nt) ) {
1478                         # Fail gracefully
1479                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1480                 } else {
1481                         # Separate the link trail from the rest of the link
1482                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1483
1484                         if ( $nt->isExternal() ) {
1485                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1486                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1487                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1488                         } else {
1489                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1490                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1491                                 $this->mLinkHolders['queries'][] = $query;
1492                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1493                                 $this->mLinkHolders['titles'][] = $nt;
1494
1495                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1496                         }
1497                 }
1498                 return $retVal;
1499         }
1500
1501         /**
1502          * Return true if subpage links should be expanded on this page.
1503          * @return bool
1504          */
1505         function areSubpagesAllowed() {
1506                 # Some namespaces don't allow subpages
1507                 global $wgNamespacesWithSubpages;
1508                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1509         }
1510
1511         /**
1512          * Handle link to subpage if necessary
1513          * @param string $target the source of the link
1514          * @param string &$text the link text, modified as necessary
1515          * @return string the full name of the link
1516          * @access private
1517          */
1518         function maybeDoSubpageLink($target, &$text) {
1519                 # Valid link forms:
1520                 # Foobar -- normal
1521                 # :Foobar -- override special treatment of prefix (images, language links)
1522                 # /Foobar -- convert to CurrentPage/Foobar
1523                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1524                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1525                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1526
1527                 $fname = 'Parser::maybeDoSubpageLink';
1528                 wfProfileIn( $fname );
1529                 $ret = $target; # default return value is no change
1530
1531                 # Some namespaces don't allow subpages,
1532                 # so only perform processing if subpages are allowed
1533                 if( $this->areSubpagesAllowed() ) {
1534                         # Look at the first character
1535                         if( $target != '' && $target{0} == '/' ) {
1536                                 # / at end means we don't want the slash to be shown
1537                                 if( substr( $target, -1, 1 ) == '/' ) {
1538                                         $target = substr( $target, 1, -1 );
1539                                         $noslash = $target;
1540                                 } else {
1541                                         $noslash = substr( $target, 1 );
1542                                 }
1543
1544                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1545                                 if( '' === $text ) {
1546                                         $text = $target;
1547                                 } # this might be changed for ugliness reasons
1548                         } else {
1549                                 # check for .. subpage backlinks
1550                                 $dotdotcount = 0;
1551                                 $nodotdot = $target;
1552                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1553                                         ++$dotdotcount;
1554                                         $nodotdot = substr( $nodotdot, 3 );
1555                                 }
1556                                 if($dotdotcount > 0) {
1557                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1558                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1559                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1560                                                 # / at the end means don't show full path
1561                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1562                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1563                                                         if( '' === $text ) {
1564                                                                 $text = $nodotdot;
1565                                                         }
1566                                                 }
1567                                                 $nodotdot = trim( $nodotdot );
1568                                                 if( $nodotdot != '' ) {
1569                                                         $ret .= '/' . $nodotdot;
1570                                                 }
1571                                         }
1572                                 }
1573                         }
1574                 }
1575
1576                 wfProfileOut( $fname );
1577                 return $ret;
1578         }
1579
1580         /**#@+
1581          * Used by doBlockLevels()
1582          * @access private
1583          */
1584         /* private */ function closeParagraph() {
1585                 $result = '';
1586                 if ( '' != $this->mLastSection ) {
1587                         $result = '</' . $this->mLastSection  . ">\n";
1588                 }
1589                 $this->mInPre = false;
1590                 $this->mLastSection = '';
1591                 return $result;
1592         }
1593         # getCommon() returns the length of the longest common substring
1594         # of both arguments, starting at the beginning of both.
1595         #
1596         /* private */ function getCommon( $st1, $st2 ) {
1597                 $fl = strlen( $st1 );
1598                 $shorter = strlen( $st2 );
1599                 if ( $fl < $shorter ) { $shorter = $fl; }
1600
1601                 for ( $i = 0; $i < $shorter; ++$i ) {
1602                         if ( $st1{$i} != $st2{$i} ) { break; }
1603                 }
1604                 return $i;
1605         }
1606         # These next three functions open, continue, and close the list
1607         # element appropriate to the prefix character passed into them.
1608         #
1609         /* private */ function openList( $char ) {
1610                 $result = $this->closeParagraph();
1611
1612                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1613                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1614                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1615                 else if ( ';' == $char ) {
1616                         $result .= '<dl><dt>';
1617                         $this->mDTopen = true;
1618                 }
1619                 else { $result = '<!-- ERR 1 -->'; }
1620
1621                 return $result;
1622         }
1623
1624         /* private */ function nextItem( $char ) {
1625                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1626                 else if ( ':' == $char || ';' == $char ) {
1627                         $close = '</dd>';
1628                         if ( $this->mDTopen ) { $close = '</dt>'; }
1629                         if ( ';' == $char ) {
1630                                 $this->mDTopen = true;
1631                                 return $close . '<dt>';
1632                         } else {
1633                                 $this->mDTopen = false;
1634                                 return $close . '<dd>';
1635                         }
1636                 }
1637                 return '<!-- ERR 2 -->';
1638         }
1639
1640         /* private */ function closeList( $char ) {
1641                 if ( '*' == $char ) { $text = '</li></ul>'; }
1642                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1643                 else if ( ':' == $char ) {
1644                         if ( $this->mDTopen ) {
1645                                 $this->mDTopen = false;
1646                                 $text = '</dt></dl>';
1647                         } else {
1648                                 $text = '</dd></dl>';
1649                         }
1650                 }
1651                 else {  return '<!-- ERR 3 -->'; }
1652                 return $text."\n";
1653         }
1654         /**#@-*/
1655
1656         /**
1657          * Make lists from lines starting with ':', '*', '#', etc.
1658          *
1659          * @access private
1660          * @return string the lists rendered as HTML
1661          */
1662         function doBlockLevels( $text, $linestart ) {
1663                 $fname = 'Parser::doBlockLevels';
1664                 wfProfileIn( $fname );
1665
1666                 # Parsing through the text line by line.  The main thing
1667                 # happening here is handling of block-level elements p, pre,
1668                 # and making lists from lines starting with * # : etc.
1669                 #
1670                 $textLines = explode( "\n", $text );
1671
1672                 $lastPrefix = $output = '';
1673                 $this->mDTopen = $inBlockElem = false;
1674                 $prefixLength = 0;
1675                 $paragraphStack = false;
1676
1677                 if ( !$linestart ) {
1678                         $output .= array_shift( $textLines );
1679                 }
1680                 foreach ( $textLines as $oLine ) {
1681                         $lastPrefixLength = strlen( $lastPrefix );
1682                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1683                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1684                         if ( !$this->mInPre ) {
1685                                 # Multiple prefixes may abut each other for nested lists.
1686                                 $prefixLength = strspn( $oLine, '*#:;' );
1687                                 $pref = substr( $oLine, 0, $prefixLength );
1688
1689                                 # eh?
1690                                 $pref2 = str_replace( ';', ':', $pref );
1691                                 $t = substr( $oLine, $prefixLength );
1692                                 $this->mInPre = !empty($preOpenMatch);
1693                         } else {
1694                                 # Don't interpret any other prefixes in preformatted text
1695                                 $prefixLength = 0;
1696                                 $pref = $pref2 = '';
1697                                 $t = $oLine;
1698                         }
1699
1700                         # List generation
1701                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1702                                 # Same as the last item, so no need to deal with nesting or opening stuff
1703                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1704                                 $paragraphStack = false;
1705
1706                                 if ( substr( $pref, -1 ) == ';') {
1707                                         # The one nasty exception: definition lists work like this:
1708                                         # ; title : definition text
1709                                         # So we check for : in the remainder text to split up the
1710                                         # title and definition, without b0rking links.
1711                                         $term = $t2 = '';
1712                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1713                                                 $t = $t2;
1714                                                 $output .= $term . $this->nextItem( ':' );
1715                                         }
1716                                 }
1717                         } elseif( $prefixLength || $lastPrefixLength ) {
1718                                 # Either open or close a level...
1719                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1720                                 $paragraphStack = false;
1721
1722                                 while( $commonPrefixLength < $lastPrefixLength ) {
1723                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1724                                         --$lastPrefixLength;
1725                                 }
1726                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1727                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1728                                 }
1729                                 while ( $prefixLength > $commonPrefixLength ) {
1730                                         $char = substr( $pref, $commonPrefixLength, 1 );
1731                                         $output .= $this->openList( $char );
1732
1733                                         if ( ';' == $char ) {
1734                                                 # FIXME: This is dupe of code above
1735                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1736                                                         $t = $t2;
1737                                                         $output .= $term . $this->nextItem( ':' );
1738                                                 }
1739                                         }
1740                                         ++$commonPrefixLength;
1741                                 }
1742                                 $lastPrefix = $pref2;
1743                         }
1744                         if( 0 == $prefixLength ) {
1745                                 wfProfileIn( "$fname-paragraph" );
1746                                 # No prefix (not in list)--go to paragraph mode
1747                                 $uniq_prefix = UNIQ_PREFIX;
1748                                 // XXX: use a stack for nestable elements like span, table and div
1749                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1750                                 $closematch = preg_match(
1751                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1752                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$uniq_prefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1753                                 if ( $openmatch or $closematch ) {
1754                                         $paragraphStack = false;
1755                                         $output .= $this->closeParagraph();
1756                                         if ( $preOpenMatch and !$preCloseMatch ) {
1757                                                 $this->mInPre = true;
1758                                         }
1759                                         if ( $closematch ) {
1760                                                 $inBlockElem = false;
1761                                         } else {
1762                                                 $inBlockElem = true;
1763                                         }
1764                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1765                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1766                                                 // pre
1767                                                 if ($this->mLastSection != 'pre') {
1768                                                         $paragraphStack = false;
1769                                                         $output .= $this->closeParagraph().'<pre>';
1770                                                         $this->mLastSection = 'pre';
1771                                                 }
1772                                                 $t = substr( $t, 1 );
1773                                         } else {
1774                                                 // paragraph
1775                                                 if ( '' == trim($t) ) {
1776                                                         if ( $paragraphStack ) {
1777                                                                 $output .= $paragraphStack.'<br />';
1778                                                                 $paragraphStack = false;
1779                                                                 $this->mLastSection = 'p';
1780                                                         } else {
1781                                                                 if ($this->mLastSection != 'p' ) {
1782                                                                         $output .= $this->closeParagraph();
1783                                                                         $this->mLastSection = '';
1784                                                                         $paragraphStack = '<p>';
1785                                                                 } else {
1786                                                                         $paragraphStack = '</p><p>';
1787                                                                 }
1788                                                         }
1789                                                 } else {
1790                                                         if ( $paragraphStack ) {
1791                                                                 $output .= $paragraphStack;
1792                                                                 $paragraphStack = false;
1793                                                                 $this->mLastSection = 'p';
1794                                                         } else if ($this->mLastSection != 'p') {
1795                                                                 $output .= $this->closeParagraph().'<p>';
1796                                                                 $this->mLastSection = 'p';
1797                                                         }
1798                                                 }
1799                                         }
1800                                 }
1801                                 wfProfileOut( "$fname-paragraph" );
1802                         }
1803                         // somewhere above we forget to get out of pre block (bug 785)
1804                         if($preCloseMatch && $this->mInPre) {
1805                                 $this->mInPre = false;
1806                         }
1807                         if ($paragraphStack === false) {
1808                                 $output .= $t."\n";
1809                         }
1810                 }
1811                 while ( $prefixLength ) {
1812                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1813                         --$prefixLength;
1814                 }
1815                 if ( '' != $this->mLastSection ) {
1816                         $output .= '</' . $this->mLastSection . '>';
1817                         $this->mLastSection = '';
1818                 }
1819
1820                 wfProfileOut( $fname );
1821                 return $output;
1822         }
1823
1824         /**
1825          * Split up a string on ':', ignoring any occurences inside
1826          * <a>..</a> or <span>...</span>
1827          * @param string $str the string to split
1828          * @param string &$before set to everything before the ':'
1829          * @param string &$after set to everything after the ':'
1830          * return string the position of the ':', or false if none found
1831          */
1832         function findColonNoLinks($str, &$before, &$after) {
1833                 # I wonder if we should make this count all tags, not just <a>
1834                 # and <span>. That would prevent us from matching a ':' that
1835                 # comes in the middle of italics other such formatting....
1836                 # -- Wil
1837                 $fname = 'Parser::findColonNoLinks';
1838                 wfProfileIn( $fname );
1839                 $pos = 0;
1840                 do {
1841                         $colon = strpos($str, ':', $pos);
1842
1843                         if ($colon !== false) {
1844                                 $before = substr($str, 0, $colon);
1845                                 $after = substr($str, $colon + 1);
1846
1847                                 # Skip any ':' within <a> or <span> pairs
1848                                 $a = substr_count($before, '<a');
1849                                 $s = substr_count($before, '<span');
1850                                 $ca = substr_count($before, '</a>');
1851                                 $cs = substr_count($before, '</span>');
1852
1853                                 if ($a <= $ca and $s <= $cs) {
1854                                         # Tags are balanced before ':'; ok
1855                                         break;
1856                                 }
1857                                 $pos = $colon + 1;
1858                         }
1859                 } while ($colon !== false);
1860                 wfProfileOut( $fname );
1861                 return $colon;
1862         }
1863
1864         /**
1865          * Return value of a magic variable (like PAGENAME)
1866          *
1867          * @access private
1868          */
1869         function getVariableValue( $index ) {
1870                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgArticle, $wgScriptPath;
1871
1872                 /**
1873                  * Some of these require message or data lookups and can be
1874                  * expensive to check many times.
1875                  */
1876                 static $varCache = array();
1877                 if( isset( $varCache[$index] ) ) return $varCache[$index];
1878
1879                 switch ( $index ) {
1880                         case MAG_CURRENTMONTH:
1881                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm' ) );
1882                         case MAG_CURRENTMONTHNAME:
1883                                 return $varCache[$index] = $wgContLang->getMonthName( date('n') );
1884                         case MAG_CURRENTMONTHNAMEGEN:
1885                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date('n') );
1886                         case MAG_CURRENTMONTHABBREV:
1887                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date('n') );
1888                         case MAG_CURRENTDAY:
1889                                 return $varCache[$index] = $wgContLang->formatNum( date('j') );
1890                         case MAG_PAGENAME:
1891                                 return $this->mTitle->getText();
1892                         case MAG_PAGENAMEE:
1893                                 return $this->mTitle->getPartialURL();
1894                         case MAG_REVISIONID:
1895                                 return $wgArticle->getRevIdFetched();
1896                         case MAG_NAMESPACE:
1897                                 # return Namespace::getCanonicalName($this->mTitle->getNamespace());
1898                                 return $wgContLang->getNsText($this->mTitle->getNamespace()); # Patch by Dori
1899                         case MAG_CURRENTDAYNAME:
1900                                 return $varCache[$index] = $wgContLang->getWeekdayName( date('w')+1 );
1901                         case MAG_CURRENTYEAR:
1902                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y' ), true );
1903                         case MAG_CURRENTTIME:
1904                                 return $varCache[$index] = $wgContLang->time( wfTimestampNow(), false );
1905                         case MAG_CURRENTWEEK:
1906                                 return $varCache[$index] = $wgContLang->formatNum( date('W') );
1907                         case MAG_CURRENTDOW:
1908                                 return $varCache[$index] = $wgContLang->formatNum( date('w') );
1909                         case MAG_NUMBEROFARTICLES:
1910                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
1911                         case MAG_NUMBEROFFILES:
1912                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
1913                         case MAG_SITENAME:
1914                                 return $wgSitename;
1915                         case MAG_SERVER:
1916                                 return $wgServer;
1917                         case MAG_SERVERNAME:
1918                                 return $wgServerName;
1919                         case MAG_SCRIPTPATH:
1920                                 return $wgScriptPath;
1921                         default:
1922                                 return NULL;
1923                 }
1924         }
1925
1926         /**
1927          * initialise the magic variables (like CURRENTMONTHNAME)
1928          *
1929          * @access private
1930          */
1931         function initialiseVariables() {
1932                 $fname = 'Parser::initialiseVariables';
1933                 wfProfileIn( $fname );
1934                 global $wgVariableIDs;
1935                 $this->mVariables = array();
1936                 foreach ( $wgVariableIDs as $id ) {
1937                         $mw =& MagicWord::get( $id );
1938                         $mw->addToArray( $this->mVariables, $id );
1939                 }
1940                 wfProfileOut( $fname );
1941         }
1942
1943         /**
1944          * parse any parentheses in format ((title|part|part))
1945          * and call callbacks to get a replacement text for any found piece
1946          *
1947          * @param string $text The text to parse
1948          * @param array $callbacks rules in form:
1949          *     '{' => array(                            # opening parentheses
1950          *                                      'end' => '}',   # closing parentheses
1951          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
1952          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
1953          *                                                                )
1954          *                                      )
1955          * @access private
1956          */
1957         function replace_callback ($text, $callbacks) {
1958                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
1959                 $lastOpeningBrace = -1;                 # last not closed parentheses
1960
1961                 for ($i = 0; $i < strlen($text); $i++) {
1962                         # check for any opening brace
1963                         $rule = null;
1964                         $nextPos = -1;
1965                         foreach ($callbacks as $key => $value) {
1966                                 $pos = strpos ($text, $key, $i);
1967                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
1968                                         $rule = $value;
1969                                         $nextPos = $pos;
1970                                 }
1971                         }
1972
1973                         if ($lastOpeningBrace >= 0) {
1974                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
1975
1976                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
1977                                         $rule = null;
1978                                         $nextPos = $pos;
1979                                 }
1980
1981                                 $pos = strpos ($text, '|', $i);
1982
1983                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
1984                                         $rule = null;
1985                                         $nextPos = $pos;
1986                                 }
1987                         }
1988
1989                         if ($nextPos == -1)
1990                                 break;
1991
1992                         $i = $nextPos;
1993
1994                         # found openning brace, lets add it to parentheses stack
1995                         if (null != $rule) {
1996                                 $piece = array('brace' => $text[$i],
1997                                                            'braceEnd' => $rule['end'],
1998                                                            'count' => 1,
1999                                                            'title' => '',
2000                                                            'parts' => null);
2001
2002                                 # count openning brace characters
2003                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2004                                         $piece['count']++;
2005                                         $i++;
2006                                 }
2007
2008                                 $piece['startAt'] = $i+1;
2009                                 $piece['partStart'] = $i+1;
2010
2011                                 # we need to add to stack only if openning brace count is enough for any given rule
2012                                 foreach ($rule['cb'] as $cnt => $fn) {
2013                                         if ($piece['count'] >= $cnt) {
2014                                                 $lastOpeningBrace ++;
2015                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2016                                                 break;
2017                                         }
2018                                 }
2019
2020                                 continue;
2021                         }
2022                         else if ($lastOpeningBrace >= 0) {
2023                                 # first check if it is a closing brace
2024                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2025                                         # lets check if it is enough characters for closing brace
2026                                         $count = 1;
2027                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2028                                                 $count++;
2029
2030                                         # if there are more closing parentheses than opening ones, we parse less
2031                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2032                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2033
2034                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2035                                         $matchingCount = 0;
2036                                         $matchingCallback = null;
2037                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2038                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2039                                                         $matchingCount = $cnt;
2040                                                         $matchingCallback = $fn;
2041                                                 }
2042                                         }
2043
2044                                         if ($matchingCount == 0) {
2045                                                 $i += $count - 1;
2046                                                 continue;
2047                                         }
2048
2049                                         # lets set a title or last part (if '|' was found)
2050                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2051                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2052                                         else
2053                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2054
2055                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2056                                         $pieceEnd = $i + $matchingCount;
2057
2058                                         if( is_callable( $matchingCallback ) ) {
2059                                                 $cbArgs = array (
2060                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2061                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2062                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2063                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2064                                                                                  );
2065                                                 # finally we can call a user callback and replace piece of text
2066                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2067                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2068                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2069                                         }
2070                                         else {
2071                                                 # null value for callback means that parentheses should be parsed, but not replaced
2072                                                 $i += $matchingCount - 1;
2073                                         }
2074
2075                                         # reset last openning parentheses, but keep it in case there are unused characters
2076                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2077                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2078                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2079                                                                    'title' => '',
2080                                                                    'parts' => null,
2081                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2082                                         $openingBraceStack[$lastOpeningBrace--] = null;
2083
2084                                         if ($matchingCount < $piece['count']) {
2085                                                 $piece['count'] -= $matchingCount;
2086                                                 $piece['startAt'] -= $matchingCount;
2087                                                 $piece['partStart'] = $piece['startAt'];
2088                                                 # do we still qualify for any callback with remaining count?
2089                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2090                                                         if ($piece['count'] >= $cnt) {
2091                                                                 $lastOpeningBrace ++;
2092                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2093                                                                 break;
2094                                                         }
2095                                                 }
2096                                         }
2097                                         continue;
2098                                 }
2099
2100                                 # lets set a title if it is a first separator, or next part otherwise
2101                                 if ($text[$i] == '|') {
2102                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2103                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2104                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2105                                         }
2106                                         else
2107                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2108
2109                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2110                                 }
2111                         }
2112                 }
2113
2114                 return $text;
2115         }
2116
2117         /**
2118          * Replace magic variables, templates, and template arguments
2119          * with the appropriate text. Templates are substituted recursively,
2120          * taking care to avoid infinite loops.
2121          *
2122          * Note that the substitution depends on value of $mOutputType:
2123          *  OT_WIKI: only {{subst:}} templates
2124          *  OT_MSG: only magic variables
2125          *  OT_HTML: all templates and magic variables
2126          *
2127          * @param string $tex The text to transform
2128          * @param array $args Key-value pairs representing template parameters to substitute
2129          * @access private
2130          */
2131         function replaceVariables( $text, $args = array() ) {
2132                 # Prevent too big inclusions
2133                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2134                         return $text;
2135                 }
2136
2137                 $fname = 'Parser::replaceVariables';
2138                 wfProfileIn( $fname );
2139
2140                 $titleChars = Title::legalChars();
2141
2142                 # This function is called recursively. To keep track of arguments we need a stack:
2143                 array_push( $this->mArgStack, $args );
2144
2145                 $braceCallbacks = array();
2146                 $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2147                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2148                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2149                 }
2150                 $callbacks = array();
2151                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2152                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2153                 $text = $this->replace_callback ($text, $callbacks);
2154
2155                 array_pop( $this->mArgStack );
2156
2157                 wfProfileOut( $fname );
2158                 return $text;
2159         }
2160
2161         /**
2162          * Replace magic variables
2163          * @access private
2164          */
2165         function variableSubstitution( $matches ) {
2166                 $fname = 'parser::variableSubstitution';
2167                 $varname = $matches[1];
2168                 wfProfileIn( $fname );
2169                 if ( !$this->mVariables ) {
2170                         $this->initialiseVariables();
2171                 }
2172                 $skip = false;
2173                 if ( $this->mOutputType == OT_WIKI ) {
2174                         # Do only magic variables prefixed by SUBST
2175                         $mwSubst =& MagicWord::get( MAG_SUBST );
2176                         if (!$mwSubst->matchStartAndRemove( $varname ))
2177                                 $skip = true;
2178                         # Note that if we don't substitute the variable below,
2179                         # we don't remove the {{subst:}} magic word, in case
2180                         # it is a template rather than a magic variable.
2181                 }
2182                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2183                         $id = $this->mVariables[$varname];
2184                         $text = $this->getVariableValue( $id );
2185                         $this->mOutput->mContainsOldMagic = true;
2186                 } else {
2187                         $text = $matches[0];
2188                 }
2189                 wfProfileOut( $fname );
2190                 return $text;
2191         }
2192
2193         # Split template arguments
2194         function getTemplateArgs( $argsString ) {
2195                 if ( $argsString === '' ) {
2196                         return array();
2197                 }
2198
2199                 $args = explode( '|', substr( $argsString, 1 ) );
2200
2201                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2202                 # merged with the next arg because the '|' character between belongs
2203                 # to the link syntax and not the template parameter syntax.
2204                 $argc = count($args);
2205
2206                 for ( $i = 0; $i < $argc-1; $i++ ) {
2207                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2208                                 $args[$i] .= '|'.$args[$i+1];
2209                                 array_splice($args, $i+1, 1);
2210                                 $i--;
2211                                 $argc--;
2212                         }
2213                 }
2214
2215                 return $args;
2216         }
2217
2218         /**
2219          * Return the text of a template, after recursively
2220          * replacing any variables or templates within the template.
2221          *
2222          * @param array $piece The parts of the template
2223          *  $piece['text']: matched text
2224          *  $piece['title']: the title, i.e. the part before the |
2225          *  $piece['parts']: the parameter array
2226          * @return string the text of the template
2227          * @access private
2228          */
2229         function braceSubstitution( $piece ) {
2230                 global $wgLinkCache, $wgContLang;
2231                 $fname = 'Parser::braceSubstitution';
2232                 wfProfileIn( $fname );
2233
2234                 $found = false;
2235                 $nowiki = false;
2236                 $noparse = false;
2237
2238                 $title = NULL;
2239
2240                 $linestart = '';
2241
2242                 # $part1 is the bit before the first |, and must contain only title characters
2243                 # $args is a list of arguments, starting from index 0, not including $part1
2244
2245                 $part1 = $piece['title'];
2246                 # If the third subpattern matched anything, it will start with |
2247
2248                 if (null == $piece['parts']) {
2249                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2250                         if ($replaceWith != $piece['text']) {
2251                                 $text = $replaceWith;
2252                                 $found = true;
2253                                 $noparse = true;
2254                         }
2255                 }
2256
2257                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2258                 $argc = count( $args );
2259
2260                 # SUBST
2261                 if ( !$found ) {
2262                         $mwSubst =& MagicWord::get( MAG_SUBST );
2263                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2264                                 # One of two possibilities is true:
2265                                 # 1) Found SUBST but not in the PST phase
2266                                 # 2) Didn't find SUBST and in the PST phase
2267                                 # In either case, return without further processing
2268                                 $text = $piece['text'];
2269                                 $found = true;
2270                                 $noparse = true;
2271                         }
2272                 }
2273
2274                 # MSG, MSGNW and INT
2275                 if ( !$found ) {
2276                         # Check for MSGNW:
2277                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2278                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2279                                 $nowiki = true;
2280                         } else {
2281                                 # Remove obsolete MSG:
2282                                 $mwMsg =& MagicWord::get( MAG_MSG );
2283                                 $mwMsg->matchStartAndRemove( $part1 );
2284                         }
2285
2286                         # Check if it is an internal message
2287                         $mwInt =& MagicWord::get( MAG_INT );
2288                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2289                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2290                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2291                                         $found = true;
2292                                 }
2293                         }
2294                 }
2295
2296                 # NS
2297                 if ( !$found ) {
2298                         # Check for NS: (namespace expansion)
2299                         $mwNs = MagicWord::get( MAG_NS );
2300                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2301                                 if ( intval( $part1 ) ) {
2302                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2303                                         $found = true;
2304                                 } else {
2305                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2306                                         if ( !is_null( $index ) ) {
2307                                                 $text = $linestart . $wgContLang->getNsText( $index );
2308                                                 $found = true;
2309                                         }
2310                                 }
2311                         }
2312                 }
2313
2314                 # LOCALURL and FULLURL
2315                 if ( !$found ) {
2316                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2317                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2318                         $mwFull =& MagicWord::get( MAG_FULLURL );
2319                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2320
2321
2322                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2323                                 $func = 'getLocalURL';
2324                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2325                                 $func = 'escapeLocalURL';
2326                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2327                                 $func = 'getFullURL';
2328                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2329                                 $func = 'escapeFullURL';
2330                         } else {
2331                                 $func = false;
2332                         }
2333
2334                         if ( $func !== false ) {
2335                                 $title = Title::newFromText( $part1 );
2336                                 if ( !is_null( $title ) ) {
2337                                         if ( $argc > 0 ) {
2338                                                 $text = $linestart . $title->$func( $args[0] );
2339                                         } else {
2340                                                 $text = $linestart . $title->$func();
2341                                         }
2342                                         $found = true;
2343                                 }
2344                         }
2345                 }
2346
2347                 # GRAMMAR
2348                 if ( !$found && $argc == 1 ) {
2349                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2350                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2351                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2352                                 $found = true;
2353                         }
2354                 }
2355
2356                 # PLURAL
2357                 if ( !$found && $argc >= 2 ) {
2358                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2359                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2360                                 if ($argc==2) {$args[2]=$args[1];}
2361                                 $text = $linestart . $wgContLang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2362                                 $found = true;
2363                         }
2364                 }
2365
2366                 # Template table test
2367
2368                 # Did we encounter this template already? If yes, it is in the cache
2369                 # and we need to check for loops.
2370                 if ( !$found && isset( $this->mTemplates[$part1] ) ) {
2371                         $found = true;
2372
2373                         # Infinite loop test
2374                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2375                                 $noparse = true;
2376                                 $found = true;
2377                                 $text = $linestart .
2378                                         "\{\{$part1}}" .
2379                                         '<!-- WARNING: template loop detected -->';
2380                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2381                         } else {
2382                                 # set $text to cached message.
2383                                 $text = $linestart . $this->mTemplates[$part1];
2384                         }
2385                 }
2386
2387                 # Load from database
2388                 $replaceHeadings = false;
2389                 $isHTML = false;
2390                 $lastPathLevel = $this->mTemplatePath;
2391                 if ( !$found ) {
2392                         $ns = NS_TEMPLATE;
2393                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage='' );
2394                         if ($subpage !== '') {
2395                                 $ns = $this->mTitle->getNamespace();
2396                         }
2397                         $title = Title::newFromText( $part1, $ns );
2398
2399                         if ($title) {
2400                                 $interwiki = Title::getInterwikiLink($title->getInterwiki());
2401                                 if ($interwiki != '' && $title->isTrans()) {
2402                                         return $this->scarytransclude($title, $interwiki);
2403                                 }
2404                         }
2405
2406                         if ( !is_null( $title ) && !$title->isExternal() ) {
2407                                 # Check for excessive inclusion
2408                                 $dbk = $title->getPrefixedDBkey();
2409                                 if ( $this->incrementIncludeCount( $dbk ) ) {
2410                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() ) {
2411                                                 # Capture special page output
2412                                                 $text = SpecialPage::capturePath( $title );
2413                                                 if ( is_string( $text ) ) {
2414                                                         $found = true;
2415                                                         $noparse = true;
2416                                                         $isHTML = true;
2417                                                         $this->disableCache();
2418                                                 }
2419                                         } else {
2420                                                 $article = new Article( $title );
2421                                                 $articleContent = $article->fetchContent(0, false);
2422                                                 if ( $articleContent !== false ) {
2423                                                         $found = true;
2424                                                         $text = $articleContent;
2425                                                         $replaceHeadings = true;
2426                                                 }
2427                                         }
2428                                 }
2429
2430                                 # If the title is valid but undisplayable, make a link to it
2431                                 if ( $this->mOutputType == OT_HTML && !$found ) {
2432                                         $text = '[['.$title->getPrefixedText().']]';
2433                                         $found = true;
2434                                 }
2435
2436                                 # Template cache array insertion
2437                                 if( $found ) {
2438                                         $this->mTemplates[$part1] = $text;
2439                                         $text = $linestart . $text;
2440                                 }
2441                         }
2442                 }
2443
2444                 # Recursive parsing, escaping and link table handling
2445                 # Only for HTML output
2446                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2447                         $text = wfEscapeWikiText( $text );
2448                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found && !$noparse) {
2449                         # Clean up argument array
2450                         $assocArgs = array();
2451                         $index = 1;
2452                         foreach( $args as $arg ) {
2453                                 $eqpos = strpos( $arg, '=' );
2454                                 if ( $eqpos === false ) {
2455                                         $assocArgs[$index++] = $arg;
2456                                 } else {
2457                                         $name = trim( substr( $arg, 0, $eqpos ) );
2458                                         $value = trim( substr( $arg, $eqpos+1 ) );
2459                                         if ( $value === false ) {
2460                                                 $value = '';
2461                                         }
2462                                         if ( $name !== false ) {
2463                                                 $assocArgs[$name] = $value;
2464                                         }
2465                                 }
2466                         }
2467
2468                         # Add a new element to the templace recursion path
2469                         $this->mTemplatePath[$part1] = 1;
2470
2471                         if( $this->mOutputType == OT_HTML ) {
2472                                 # Remove <noinclude> sections and <includeonly> tags
2473                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2474                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2475                                 # Strip <nowiki>, <pre>, etc.
2476                                 $text = $this->strip( $text, $this->mStripState );
2477                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2478                         }
2479                         $text = $this->replaceVariables( $text, $assocArgs );
2480
2481                         # Resume the link cache and register the inclusion as a link
2482                         if ( $this->mOutputType == OT_HTML && !is_null( $title ) ) {
2483                                 $wgLinkCache->addLinkObj( $title );
2484                         }
2485
2486                         # If the template begins with a table or block-level
2487                         # element, it should be treated as beginning a new line.
2488                         if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2489                                 $text = "\n" . $text;
2490                         }
2491                 }
2492                 # Prune lower levels off the recursion check path
2493                 $this->mTemplatePath = $lastPathLevel;
2494
2495                 if ( !$found ) {
2496                         wfProfileOut( $fname );
2497                         return $piece['text'];
2498                 } else {
2499                         if ( $isHTML ) {
2500                                 # Replace raw HTML by a placeholder
2501                                 # Add a blank line preceding, to prevent it from mucking up
2502                                 # immediately preceding headings
2503                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2504                         } else {
2505                                 # replace ==section headers==
2506                                 # XXX this needs to go away once we have a better parser.
2507                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2508                                         if( !is_null( $title ) )
2509                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2510                                         else
2511                                                 $encodedname = base64_encode("");
2512                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2513                                                 PREG_SPLIT_DELIM_CAPTURE);
2514                                         $text = '';
2515                                         $nsec = 0;
2516                                         for( $i = 0; $i < count($m); $i += 2 ) {
2517                                                 $text .= $m[$i];
2518                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2519                                                 $hl = $m[$i + 1];
2520                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2521                                                         $text .= $hl;
2522                                                         continue;
2523                                                 }
2524                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2525                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2526                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2527
2528                                                 $nsec++;
2529                                         }
2530                                 }
2531                         }
2532                 }
2533
2534                 # Prune lower levels off the recursion check path
2535                 $this->mTemplatePath = $lastPathLevel;
2536
2537                 if ( !$found ) {
2538                         wfProfileOut( $fname );
2539                         return $piece['text'];
2540                 } else {
2541                         wfProfileOut( $fname );
2542                         return $text;
2543                 }
2544         }
2545
2546         /**
2547          * Translude an interwiki link.
2548          */
2549         function scarytransclude($title, $interwiki) {
2550                 global $wgEnableScaryTranscluding;
2551
2552                 if (!$wgEnableScaryTranscluding)
2553                         return wfMsg('scarytranscludedisabled');
2554
2555                 $articlename = "Template:" . $title->getDBkey();
2556                 $url = str_replace('$1', urlencode($articlename), $interwiki);
2557                 if (strlen($url) > 255)
2558                         return wfMsg('scarytranscludetoolong');
2559                 $text = $this->fetchScaryTemplateMaybeFromCache($url);
2560                 $this->mIWTransData[] = $text;
2561                 return "<!--IW_TRANSCLUDE ".(count($this->mIWTransData) - 1)."-->";
2562         }
2563
2564         function fetchScaryTemplateMaybeFromCache($url) {
2565                 $dbr =& wfGetDB(DB_SLAVE);
2566                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2567                                 array('tc_url' => $url));
2568                 if ($obj) {
2569                         $time = $obj->tc_time;
2570                         $text = $obj->tc_contents;
2571                         if ($time && $time < (time() + (60*60))) {
2572                                 return $text;
2573                         }
2574                 }
2575
2576                 $text = wfGetHTTP($url . '?action=render');
2577                 if (!$text)
2578                         return wfMsg('scarytranscludefailed', $url);
2579
2580                 $dbw =& wfGetDB(DB_MASTER);
2581                 $dbw->replace('transcache', array(), array(
2582                         'tc_url' => $url,
2583                         'tc_time' => time(),
2584                         'tc_contents' => $text));
2585                 return $text;
2586         }
2587
2588
2589         /**
2590          * Triple brace replacement -- used for template arguments
2591          * @access private
2592          */
2593         function argSubstitution( $matches ) {
2594                 $arg = trim( $matches['title'] );
2595                 $text = $matches['text'];
2596                 $inputArgs = end( $this->mArgStack );
2597
2598                 if ( array_key_exists( $arg, $inputArgs ) ) {
2599                         $text = $inputArgs[$arg];
2600                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
2601                         $text = $matches['parts'][0];
2602                 }
2603
2604                 return $text;
2605         }
2606
2607         /**
2608          * Returns true if the function is allowed to include this entity
2609          * @access private
2610          */
2611         function incrementIncludeCount( $dbk ) {
2612                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2613                         $this->mIncludeCount[$dbk] = 0;
2614                 }
2615                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2616                         return true;
2617                 } else {
2618                         return false;
2619                 }
2620         }
2621
2622         /**
2623          * This function accomplishes several tasks:
2624          * 1) Auto-number headings if that option is enabled
2625          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2626          * 3) Add a Table of contents on the top for users who have enabled the option
2627          * 4) Auto-anchor headings
2628          *
2629          * It loops through all headlines, collects the necessary data, then splits up the
2630          * string and re-inserts the newly formatted headlines.
2631          *
2632          * @param string $text
2633          * @param boolean $isMain
2634          * @access private
2635          */
2636         function formatHeadings( $text, $isMain=true ) {
2637                 global $wgMaxTocLevel, $wgContLang, $wgLinkHolders, $wgInterwikiLinkHolders;
2638
2639                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2640                 $doShowToc = true;
2641                 $forceTocHere = false;
2642                 if( !$this->mTitle->userCanEdit() ) {
2643                         $showEditLink = 0;
2644                 } else {
2645                         $showEditLink = $this->mOptions->getEditSection();
2646                 }
2647
2648                 # Inhibit editsection links if requested in the page
2649                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2650                 if( $esw->matchAndRemove( $text ) ) {
2651                         $showEditLink = 0;
2652                 }
2653                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
2654                 # do not add TOC
2655                 $mw =& MagicWord::get( MAG_NOTOC );
2656                 if( $mw->matchAndRemove( $text ) ) {
2657                         $doShowToc = false;
2658                 }
2659
2660                 # Get all headlines for numbering them and adding funky stuff like [edit]
2661                 # links - this is for later, but we need the number of headlines right now
2662                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
2663
2664                 # if there are fewer than 4 headlines in the article, do not show TOC
2665                 if( $numMatches < 4 ) {
2666                         $doShowToc = false;
2667                 }
2668
2669                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
2670                 # override above conditions and always show TOC at that place
2671
2672                 $mw =& MagicWord::get( MAG_TOC );
2673                 if($mw->match( $text ) ) {
2674                         $doShowToc = true;
2675                         $forceTocHere = true;
2676                 } else {
2677                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
2678                         # override above conditions and always show TOC above first header
2679                         $mw =& MagicWord::get( MAG_FORCETOC );
2680                         if ($mw->matchAndRemove( $text ) ) {
2681                                 $doShowToc = true;
2682                         }
2683                 }
2684
2685                 # Never ever show TOC if no headers
2686                 if( $numMatches < 1 ) {
2687                         $doShowToc = false;
2688                 }
2689
2690                 # We need this to perform operations on the HTML
2691                 $sk =& $this->mOptions->getSkin();
2692
2693                 # headline counter
2694                 $headlineCount = 0;
2695                 $sectionCount = 0; # headlineCount excluding template sections
2696
2697                 # Ugh .. the TOC should have neat indentation levels which can be
2698                 # passed to the skin functions. These are determined here
2699                 $toc = '';
2700                 $full = '';
2701                 $head = array();
2702                 $sublevelCount = array();
2703                 $levelCount = array();
2704                 $toclevel = 0;
2705                 $level = 0;
2706                 $prevlevel = 0;
2707                 $toclevel = 0;
2708                 $prevtoclevel = 0;
2709
2710                 foreach( $matches[3] as $headline ) {
2711                         $istemplate = 0;
2712                         $templatetitle = '';
2713                         $templatesection = 0;
2714                         $numbering = '';
2715
2716                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
2717                                 $istemplate = 1;
2718                                 $templatetitle = base64_decode($mat[1]);
2719                                 $templatesection = 1 + (int)base64_decode($mat[2]);
2720                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
2721                         }
2722
2723                         if( $toclevel ) {
2724                                 $prevlevel = $level;
2725                                 $prevtoclevel = $toclevel;
2726                         }
2727                         $level = $matches[1][$headlineCount];
2728
2729                         if( $doNumberHeadings || $doShowToc ) {
2730
2731                                 if ( $level > $prevlevel ) {
2732                                         # Increase TOC level
2733                                         $toclevel++;
2734                                         $sublevelCount[$toclevel] = 0;
2735                                         $toc .= $sk->tocIndent();
2736                                 }
2737                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
2738                                         # Decrease TOC level, find level to jump to
2739
2740                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
2741                                                 # Can only go down to level 1
2742                                                 $toclevel = 1;
2743                                         } else {
2744                                                 for ($i = $toclevel; $i > 0; $i--) {
2745                                                         if ( $levelCount[$i] == $level ) {
2746                                                                 # Found last matching level
2747                                                                 $toclevel = $i;
2748                                                                 break;
2749                                                         }
2750                                                         elseif ( $levelCount[$i] < $level ) {
2751                                                                 # Found first matching level below current level
2752                                                                 $toclevel = $i + 1;
2753                                                                 break;
2754                                                         }
2755                                                 }
2756                                         }
2757
2758                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
2759                                 }
2760                                 else {
2761                                         # No change in level, end TOC line
2762                                         $toc .= $sk->tocLineEnd();
2763                                 }
2764
2765                                 $levelCount[$toclevel] = $level;
2766
2767                                 # count number of headlines for each level
2768                                 @$sublevelCount[$toclevel]++;
2769                                 $dot = 0;
2770                                 for( $i = 1; $i <= $toclevel; $i++ ) {
2771                                         if( !empty( $sublevelCount[$i] ) ) {
2772                                                 if( $dot ) {
2773                                                         $numbering .= '.';
2774                                                 }
2775                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
2776                                                 $dot = 1;
2777                                         }
2778                                 }
2779                         }
2780
2781                         # The canonized header is a version of the header text safe to use for links
2782                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
2783                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
2784                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
2785
2786                         # Remove link placeholders by the link text.
2787                         #     <!--LINK number-->
2788                         # turns into
2789                         #     link text with suffix
2790                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
2791                                                             "\$this->mLinkHolders['texts'][\$1]",
2792                                                             $canonized_headline );
2793                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
2794                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
2795                                                             $canonized_headline );
2796
2797                         # strip out HTML
2798                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
2799                         $tocline = trim( $canonized_headline );
2800                         $canonized_headline = urlencode( Sanitizer::decodeCharReferences( str_replace(' ', '_', $tocline) ) );
2801                         $replacearray = array(
2802                                 '%3A' => ':',
2803                                 '%' => '.'
2804                         );
2805                         $canonized_headline = str_replace(array_keys($replacearray),array_values($replacearray),$canonized_headline);
2806                         $refers[$headlineCount] = $canonized_headline;
2807
2808                         # count how many in assoc. array so we can track dupes in anchors
2809                         @$refers[$canonized_headline]++;
2810                         $refcount[$headlineCount]=$refers[$canonized_headline];
2811
2812                         # Don't number the heading if it is the only one (looks silly)
2813                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
2814                                 # the two are different if the line contains a link
2815                                 $headline=$numbering . ' ' . $headline;
2816                         }
2817
2818                         # Create the anchor for linking from the TOC to the section
2819                         $anchor = $canonized_headline;
2820                         if($refcount[$headlineCount] > 1 ) {
2821                                 $anchor .= '_' . $refcount[$headlineCount];
2822                         }
2823                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
2824                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
2825                         }
2826                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
2827                                 if ( empty( $head[$headlineCount] ) ) {
2828                                         $head[$headlineCount] = '';
2829                                 }
2830                                 if( $istemplate )
2831                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
2832                                 else
2833                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1);
2834                         }
2835
2836                         # give headline the correct <h#> tag
2837                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
2838
2839                         $headlineCount++;
2840                         if( !$istemplate )
2841                                 $sectionCount++;
2842                 }
2843
2844                 if( $doShowToc ) {
2845                         $toc .= $sk->tocUnindent( $toclevel - 1 );
2846                         $toc = $sk->tocList( $toc );
2847                 }
2848
2849                 # split up and insert constructed headlines
2850
2851                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
2852                 $i = 0;
2853
2854                 foreach( $blocks as $block ) {
2855                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
2856                                 # This is the [edit] link that appears for the top block of text when
2857                                 # section editing is enabled
2858
2859                                 # Disabled because it broke block formatting
2860                                 # For example, a bullet point in the top line
2861                                 # $full .= $sk->editSectionLink(0);
2862                         }
2863                         $full .= $block;
2864                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
2865                         # Top anchor now in skin
2866                                 $full = $full.$toc;
2867                         }
2868
2869                         if( !empty( $head[$i] ) ) {
2870                                 $full .= $head[$i];
2871                         }
2872                         $i++;
2873                 }
2874                 if($forceTocHere) {
2875                         $mw =& MagicWord::get( MAG_TOC );
2876                         return $mw->replace( $toc, $full );
2877                 } else {
2878                         return $full;
2879                 }
2880         }
2881
2882         /**
2883          * Return an HTML link for the "ISBN 123456" text
2884          * @access private
2885          */
2886         function magicISBN( $text ) {
2887                 $fname = 'Parser::magicISBN';
2888                 wfProfileIn( $fname );
2889
2890                 $a = split( 'ISBN ', ' '.$text );
2891                 if ( count ( $a ) < 2 ) {
2892                         wfProfileOut( $fname );
2893                         return $text;
2894                 }
2895                 $text = substr( array_shift( $a ), 1);
2896                 $valid = '0123456789-Xx';
2897
2898                 foreach ( $a as $x ) {
2899                         $isbn = $blank = '' ;
2900                         while ( ' ' == $x{0} ) {
2901                                 $blank .= ' ';
2902                                 $x = substr( $x, 1 );
2903                         }
2904                         if ( $x == '' ) { # blank isbn
2905                                 $text .= "ISBN $blank";
2906                                 continue;
2907                         }
2908                         while ( strstr( $valid, $x{0} ) != false ) {
2909                                 $isbn .= $x{0};
2910                                 $x = substr( $x, 1 );
2911                         }
2912                         $num = str_replace( '-', '', $isbn );
2913                         $num = str_replace( ' ', '', $num );
2914                         $num = str_replace( 'x', 'X', $num );
2915
2916                         if ( '' == $num ) {
2917                                 $text .= "ISBN $blank$x";
2918                         } else {
2919                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
2920                                 $text .= '<a href="' .
2921                                 $titleObj->escapeLocalUrl( 'isbn='.$num ) .
2922                                         "\" class=\"internal\">ISBN $isbn</a>";
2923                                 $text .= $x;
2924                         }
2925                 }
2926                 wfProfileOut( $fname );
2927                 return $text;
2928         }
2929
2930         /**
2931          * Return an HTML link for the "RFC 1234" text
2932          *
2933          * @access private
2934          * @param string $text     Text to be processed
2935          * @param string $keyword  Magic keyword to use (default RFC)
2936          * @param string $urlmsg   Interface message to use (default rfcurl)
2937          * @return string
2938          */
2939         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
2940
2941                 $valid = '0123456789';
2942                 $internal = false;
2943
2944                 $a = split( $keyword, ' '.$text );
2945                 if ( count ( $a ) < 2 ) {
2946                         return $text;
2947                 }
2948                 $text = substr( array_shift( $a ), 1);
2949
2950                 /* Check if keyword is preceed by [[.
2951                  * This test is made here cause of the array_shift above
2952                  * that prevent the test to be done in the foreach.
2953                  */
2954                 if ( substr( $text, -2 ) == '[[' ) {
2955                         $internal = true;
2956                 }
2957
2958                 foreach ( $a as $x ) {
2959                         /* token might be empty if we have RFC RFC 1234 */
2960                         if ( $x=='' ) {
2961                                 $text.=$keyword;
2962                                 continue;
2963                                 }
2964
2965                         $id = $blank = '' ;
2966
2967                         /** remove and save whitespaces in $blank */
2968                         while ( $x{0} == ' ' ) {
2969                                 $blank .= ' ';
2970                                 $x = substr( $x, 1 );
2971                         }
2972
2973                         /** remove and save the rfc number in $id */
2974                         while ( strstr( $valid, $x{0} ) != false ) {
2975                                 $id .= $x{0};
2976                                 $x = substr( $x, 1 );
2977                         }
2978
2979                         if ( $id == '' ) {
2980                                 /* call back stripped spaces*/
2981                                 $text .= $keyword.$blank.$x;
2982                         } elseif( $internal ) {
2983                                 /* normal link */
2984                                 $text .= $keyword.$id.$x;
2985                         } else {
2986                                 /* build the external link*/
2987                                 $url = wfMsg( $urlmsg, $id);
2988                                 $sk =& $this->mOptions->getSkin();
2989                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
2990                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
2991                         }
2992
2993                         /* Check if the next RFC keyword is preceed by [[ */
2994                         $internal = ( substr($x,-2) == '[[' );
2995                 }
2996                 return $text;
2997         }
2998
2999         /**
3000          * Transform wiki markup when saving a page by doing \r\n -> \n
3001          * conversion, substitting signatures, {{subst:}} templates, etc.
3002          *
3003          * @param string $text the text to transform
3004          * @param Title &$title the Title object for the current article
3005          * @param User &$user the User object describing the current user
3006          * @param ParserOptions $options parsing options
3007          * @param bool $clearState whether to clear the parser state first
3008          * @return string the altered wiki markup
3009          * @access public
3010          */
3011         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3012                 $this->mOptions = $options;
3013                 $this->mTitle =& $title;
3014                 $this->mOutputType = OT_WIKI;
3015
3016                 if ( $clearState ) {
3017                         $this->clearState();
3018                 }
3019
3020                 $stripState = false;
3021                 $pairs = array(
3022                         "\r\n" => "\n",
3023                 );
3024                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3025                 $text = $this->strip( $text, $stripState, false );
3026                 $text = $this->pstPass2( $text, $user );
3027                 $text = $this->unstrip( $text, $stripState );
3028                 $text = $this->unstripNoWiki( $text, $stripState );
3029                 return $text;
3030         }
3031
3032         /**
3033          * Pre-save transform helper function
3034          * @access private
3035          */
3036         function pstPass2( $text, &$user ) {
3037                 global $wgContLang, $wgLocaltimezone;
3038
3039                 # Variable replacement
3040                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3041                 $text = $this->replaceVariables( $text );
3042
3043                 # Signatures
3044                 #
3045                 $n = $user->getName();
3046                 $k = $user->getOption( 'nickname' );
3047                 if ( '' == $k ) { $k = $n; }
3048                 if ( isset( $wgLocaltimezone ) ) {
3049                         $oldtz = getenv( 'TZ' );
3050                         putenv( 'TZ='.$wgLocaltimezone );
3051                 }
3052
3053                 /* Note: This is the timestamp saved as hardcoded wikitext to
3054                  * the database, we use $wgContLang here in order to give
3055                  * everyone the same signiture and use the default one rather
3056                  * than the one selected in each users preferences.
3057                  */
3058                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3059                   ' (' . date( 'T' ) . ')';
3060                 if ( isset( $wgLocaltimezone ) ) {
3061                         putenv( 'TZ='.$oldtz );
3062                 }
3063
3064                 if( $user->getOption( 'fancysig' ) ) {
3065                         $sigText = $k;
3066                 } else {
3067                         $sigText = '[[' . $wgContLang->getNsText( NS_USER ) . ":$n|$k]]";
3068                 }
3069                 $text = preg_replace( '/~~~~~/', $d, $text );
3070                 $text = preg_replace( '/~~~~/', "$sigText $d", $text );
3071                 $text = preg_replace( '/~~~/', $sigText, $text );
3072
3073                 # Context links: [[|name]] and [[name (context)|]]
3074                 #
3075                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
3076                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
3077                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3078                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3079
3080                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3081                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3082                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3083                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3084                 $context = '';
3085                 $t = $this->mTitle->getText();
3086                 if ( preg_match( $conpat, $t, $m ) ) {
3087                         $context = $m[2];
3088                 }
3089                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3090                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3091                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3092
3093                 if ( '' == $context ) {
3094                         $text = preg_replace( $p2, '[[\\1]]', $text );
3095                 } else {
3096                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3097                 }
3098
3099                 # Trim trailing whitespace
3100                 # MAG_END (__END__) tag allows for trailing
3101                 # whitespace to be deliberately included
3102                 $text = rtrim( $text );
3103                 $mw =& MagicWord::get( MAG_END );
3104                 $mw->matchAndRemove( $text );
3105
3106                 return $text;
3107         }
3108
3109         /**
3110          * Set up some variables which are usually set up in parse()
3111          * so that an external function can call some class members with confidence
3112          * @access public
3113          */
3114         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3115                 $this->mTitle =& $title;
3116                 $this->mOptions = $options;
3117                 $this->mOutputType = $outputType;
3118                 if ( $clearState ) {
3119                         $this->clearState();
3120                 }
3121         }
3122
3123         /**
3124          * Transform a MediaWiki message by replacing magic variables.
3125          *
3126          * @param string $text the text to transform
3127          * @param ParserOptions $options  options
3128          * @return string the text with variables substituted
3129          * @access public
3130          */
3131         function transformMsg( $text, $options ) {
3132                 global $wgTitle;
3133                 static $executing = false;
3134
3135                 # Guard against infinite recursion
3136                 if ( $executing ) {
3137                         return $text;
3138                 }
3139                 $executing = true;
3140
3141                 $this->mTitle = $wgTitle;
3142                 $this->mOptions = $options;
3143                 $this->mOutputType = OT_MSG;
3144                 $this->clearState();
3145                 $text = $this->replaceVariables( $text );
3146
3147                 $executing = false;
3148                 return $text;
3149         }
3150
3151         /**
3152          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3153          * Callback will be called with the text within
3154          * Transform and return the text within
3155          * @access public
3156          */
3157         function setHook( $tag, $callback ) {
3158                 $oldVal = @$this->mTagHooks[$tag];
3159                 $this->mTagHooks[$tag] = $callback;
3160                 return $oldVal;
3161         }
3162
3163         /**
3164          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3165          * Placeholders created in Skin::makeLinkObj()
3166          * Returns an array of links found, indexed by PDBK:
3167          *  0 - broken
3168          *  1 - normal link
3169          *  2 - stub
3170          * $options is a bit field, RLH_FOR_UPDATE to select for update
3171          */
3172         function replaceLinkHolders( &$text, $options = 0 ) {
3173                 global $wgUser, $wgLinkCache;
3174                 global $wgOutputReplace;
3175
3176                 $fname = 'Parser::replaceLinkHolders';
3177                 wfProfileIn( $fname );
3178
3179                 $pdbks = array();
3180                 $colours = array();
3181                 $sk = $this->mOptions->getSkin();
3182
3183                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3184                         wfProfileIn( $fname.'-check' );
3185                         $dbr =& wfGetDB( DB_SLAVE );
3186                         $page = $dbr->tableName( 'page' );
3187                         $threshold = $wgUser->getOption('stubthreshold');
3188
3189                         # Sort by namespace
3190                         asort( $this->mLinkHolders['namespaces'] );
3191
3192                         # Generate query
3193                         $query = false;
3194                         foreach ( $this->mLinkHolders['namespaces'] as $key => $val ) {
3195                                 # Make title object
3196                                 $title = $this->mLinkHolders['titles'][$key];
3197
3198                                 # Skip invalid entries.
3199                                 # Result will be ugly, but prevents crash.
3200                                 if ( is_null( $title ) ) {
3201                                         continue;
3202                                 }
3203                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3204
3205                                 # Check if it's in the link cache already
3206                                 if ( $title->isAlwaysKnown() || $wgLinkCache->getGoodLinkID( $pdbk ) ) {
3207                                         $colours[$pdbk] = 1;
3208                                 } elseif ( $wgLinkCache->isBadLink( $pdbk ) ) {
3209                                         $colours[$pdbk] = 0;
3210                                 } else {
3211                                         # Not in the link cache, add it to the query
3212                                         if ( !isset( $current ) ) {
3213                                                 $current = $val;
3214                                                 $query =  "SELECT page_id, page_namespace, page_title";
3215                                                 if ( $threshold > 0 ) {
3216                                                         $query .= ', page_len, page_is_redirect';
3217                                                 }
3218                                                 $query .= " FROM $page WHERE (page_namespace=$val AND page_title IN(";
3219                                         } elseif ( $current != $val ) {
3220                                                 $current = $val;
3221                                                 $query .= ")) OR (page_namespace=$val AND page_title IN(";
3222                                         } else {
3223                                                 $query .= ', ';
3224                                         }
3225
3226                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3227                                 }
3228                         }
3229                         if ( $query ) {
3230                                 $query .= '))';
3231                                 if ( $options & RLH_FOR_UPDATE ) {
3232                                         $query .= ' FOR UPDATE';
3233                                 }
3234
3235                                 $res = $dbr->query( $query, $fname );
3236
3237                                 # Fetch data and form into an associative array
3238                                 # non-existent = broken
3239                                 # 1 = known
3240                                 # 2 = stub
3241                                 while ( $s = $dbr->fetchObject($res) ) {
3242                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3243                                         $pdbk = $title->getPrefixedDBkey();
3244                                         $wgLinkCache->addGoodLinkObj( $s->page_id, $title );
3245
3246                                         if ( $threshold >  0 ) {
3247                                                 $size = $s->page_len;
3248                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3249                                                         $colours[$pdbk] = 1;
3250                                                 } else {
3251                                                         $colours[$pdbk] = 2;
3252                                                 }
3253                                         } else {
3254                                                 $colours[$pdbk] = 1;
3255                                         }
3256                                 }
3257                         }
3258                         wfProfileOut( $fname.'-check' );
3259
3260                         # Construct search and replace arrays
3261                         wfProfileIn( $fname.'-construct' );
3262                         $wgOutputReplace = array();
3263                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3264                                 $pdbk = $pdbks[$key];
3265                                 $searchkey = "<!--LINK $key-->";
3266                                 $title = $this->mLinkHolders['titles'][$key];
3267                                 if ( empty( $colours[$pdbk] ) ) {
3268                                         $wgLinkCache->addBadLinkObj( $title );
3269                                         $colours[$pdbk] = 0;
3270                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3271                                                                         $this->mLinkHolders['texts'][$key],
3272                                                                         $this->mLinkHolders['queries'][$key] );
3273                                 } elseif ( $colours[$pdbk] == 1 ) {
3274                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3275                                                                         $this->mLinkHolders['texts'][$key],
3276                                                                         $this->mLinkHolders['queries'][$key] );
3277                                 } elseif ( $colours[$pdbk] == 2 ) {
3278                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3279                                                                         $this->mLinkHolders['texts'][$key],
3280                                                                         $this->mLinkHolders['queries'][$key] );
3281                                 }
3282                         }
3283                         wfProfileOut( $fname.'-construct' );
3284
3285                         # Do the thing
3286                         wfProfileIn( $fname.'-replace' );
3287
3288                         $text = preg_replace_callback(
3289                                 '/(<!--LINK .*?-->)/',
3290                                 "wfOutputReplaceMatches",
3291                                 $text);
3292
3293                         wfProfileOut( $fname.'-replace' );
3294                 }
3295
3296                 # Now process interwiki link holders
3297                 # This is quite a bit simpler than internal links
3298                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3299                         wfProfileIn( $fname.'-interwiki' );
3300                         # Make interwiki link HTML
3301                         $wgOutputReplace = array();
3302                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3303                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3304                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3305                         }
3306
3307                         $text = preg_replace_callback(
3308                                 '/<!--IWLINK (.*?)-->/',
3309                                 "wfOutputReplaceMatches",
3310                                 $text );
3311                         wfProfileOut( $fname.'-interwiki' );
3312                 }
3313
3314                 wfProfileOut( $fname );
3315                 return $colours;
3316         }
3317
3318         /**
3319          * Replace <!--LINK--> link placeholders with plain text of links
3320          * (not HTML-formatted).
3321          * @param string $text
3322          * @return string
3323          */
3324         function replaceLinkHoldersText( $text ) {
3325                 global $wgUser, $wgLinkCache;
3326                 global $wgOutputReplace;
3327
3328                 $fname = 'Parser::replaceLinkHoldersText';
3329                 wfProfileIn( $fname );
3330
3331                 $text = preg_replace_callback(
3332                         '/<!--(LINK|IWLINK) (.*?)-->/',
3333                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3334                         $text );
3335
3336                 wfProfileOut( $fname );
3337                 return $text;
3338         }
3339
3340         /**
3341          * @param array $matches
3342          * @return string
3343          * @access private
3344          */
3345         function replaceLinkHoldersTextCallback( $matches ) {
3346                 $type = $matches[1];
3347                 $key  = $matches[2];
3348                 if( $type == 'LINK' ) {
3349                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3350                                 return $this->mLinkHolders['texts'][$key];
3351                         }
3352                 } elseif( $type == 'IWLINK' ) {
3353                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3354                                 return $this->mInterwikiLinkHolders['texts'][$key];
3355                         }
3356                 }
3357                 return $matches[0];
3358         }
3359
3360         /**
3361          * Renders an image gallery from a text with one line per image.
3362          * text labels may be given by using |-style alternative text. E.g.
3363          *   Image:one.jpg|The number "1"
3364          *   Image:tree.jpg|A tree
3365          * given as text will return the HTML of a gallery with two images,
3366          * labeled 'The number "1"' and
3367          * 'A tree'.
3368          *
3369          * @static
3370          */
3371         function renderImageGallery( $text ) {
3372                 # Setup the parser
3373                 global $wgUser, $wgTitle;
3374                 $parserOptions = ParserOptions::newFromUser( $wgUser );
3375                 $localParser = new Parser();
3376
3377                 global $wgLinkCache;
3378                 $ig = new ImageGallery();
3379                 $ig->setShowBytes( false );
3380                 $ig->setShowFilename( false );
3381                 $lines = explode( "\n", $text );
3382
3383                 foreach ( $lines as $line ) {
3384                         # match lines like these:
3385                         # Image:someimage.jpg|This is some image
3386                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3387                         # Skip empty lines
3388                         if ( count( $matches ) == 0 ) {
3389                                 continue;
3390                         }
3391                         $nt = Title::newFromURL( $matches[1] );
3392                         if( is_null( $nt ) ) {
3393                                 # Bogus title. Ignore these so we don't bomb out later.
3394                                 continue;
3395                         }
3396                         if ( isset( $matches[3] ) ) {
3397                                 $label = $matches[3];
3398                         } else {
3399                                 $label = '';
3400                         }
3401
3402                         $html = $localParser->parse( $label , $wgTitle, $parserOptions );
3403                         $html = $html->mText;
3404
3405                         $ig->add( new Image( $nt ), $html );
3406                         $wgLinkCache->addImageLinkObj( $nt );
3407                 }
3408                 return $ig->toHTML();
3409         }
3410
3411         /**
3412          * Parse image options text and use it to make an image
3413          */
3414         function makeImage( &$nt, $options ) {
3415                 global $wgContLang, $wgUseImageResize;
3416                 global $wgUser, $wgThumbLimits;
3417
3418                 $align = '';
3419
3420                 # Check if the options text is of the form "options|alt text"
3421                 # Options are:
3422                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3423                 #  * left               no resizing, just left align. label is used for alt= only
3424                 #  * right              same, but right aligned
3425                 #  * none               same, but not aligned
3426                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3427                 #  * center             center the image
3428                 #  * framed             Keep original image size, no magnify-button.
3429
3430                 $part = explode( '|', $options);
3431
3432                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3433                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3434                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3435                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3436                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3437                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3438                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3439                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3440                 $caption = '';
3441
3442                 $width = $height = $framed = $thumb = false;
3443                 $manual_thumb = '' ;
3444
3445                 foreach( $part as $key => $val ) {
3446                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3447                                 $thumb=true;
3448                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3449                                 # use manually specified thumbnail
3450                                 $thumb=true;
3451                                 $manual_thumb = $match;
3452                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3453                                 # remember to set an alignment, don't render immediately
3454                                 $align = 'right';
3455                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
3456                                 # remember to set an alignment, don't render immediately
3457                                 $align = 'left';
3458                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
3459                                 # remember to set an alignment, don't render immediately
3460                                 $align = 'center';
3461                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
3462                                 # remember to set an alignment, don't render immediately
3463                                 $align = 'none';
3464                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
3465                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
3466                                 # $match is the image width in pixels
3467                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
3468                                         $width = intval( $m[1] );
3469                                         $height = intval( $m[2] );
3470                                 } else {
3471                                         $width = intval($match);
3472                                 }
3473                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
3474                                 $framed=true;
3475                         } else {
3476                                 $caption = $val;
3477                         }
3478                 }
3479                 # Strip bad stuff out of the alt text
3480                 $alt = $this->replaceLinkHoldersText( $caption );
3481                 $alt = Sanitizer::stripAllTags( $alt );
3482
3483                 # Linker does the rest
3484                 $sk =& $this->mOptions->getSkin();
3485                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
3486         }
3487
3488         /**
3489          * Set a flag in the output object indicating that the content is dynamic and
3490          * shouldn't be cached.
3491          */
3492         function disableCache() {
3493                 $this->mOutput->mCacheTime = -1;
3494         }
3495
3496         /**
3497          * Callback from the Sanitizer for expanding items found in HTML attribute
3498          * values, so they can be safely tested and escaped.
3499          * @param string $text
3500          * @param array $args
3501          * @return string
3502          * @access private
3503          */
3504         function attributeStripCallback( &$text, $args ) {
3505                 $text = $this->replaceVariables( $text, $args );
3506                 $text = $this->unstripForHTML( $text );
3507                 return $text;
3508         }
3509
3510         function unstripForHTML( $text ) {
3511                 $text = $this->unstrip( $text, $this->mStripState );
3512                 $text = $this->unstripNoWiki( $text, $this->mStripState );
3513                 return $text;
3514         }
3515 }
3516
3517 /**
3518  * @todo document
3519  * @package MediaWiki
3520  */
3521 class ParserOutput
3522 {
3523         var $mText, $mLanguageLinks, $mCategoryLinks, $mContainsOldMagic;
3524         var $mCacheTime; # Timestamp on this article, or -1 for uncacheable. Used in ParserCache.
3525         var $mVersion;   # Compatibility check
3526         var $mTitleText; # title text of the chosen language variant
3527
3528         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
3529                 $containsOldMagic = false, $titletext = '' )
3530         {
3531                 $this->mText = $text;
3532                 $this->mLanguageLinks = $languageLinks;
3533                 $this->mCategoryLinks = $categoryLinks;
3534                 $this->mContainsOldMagic = $containsOldMagic;
3535                 $this->mCacheTime = '';
3536                 $this->mVersion = MW_PARSER_VERSION;
3537                 $this->mTitleText = $titletext;
3538         }
3539
3540         function getText()                   { return $this->mText; }
3541         function getLanguageLinks()          { return $this->mLanguageLinks; }
3542         function getCategoryLinks()          { return array_keys( $this->mCategoryLinks ); }
3543         function getCacheTime()              { return $this->mCacheTime; }
3544         function getTitleText()              { return $this->mTitleText; }
3545         function containsOldMagic()          { return $this->mContainsOldMagic; }
3546         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
3547         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
3548         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategoryLinks, $cl ); }
3549         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
3550         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
3551         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
3552
3553         function addCategoryLink( $c )       { $this->mCategoryLinks[$c] = 1; }
3554
3555         function merge( $other ) {
3556                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $other->mLanguageLinks );
3557                 $this->mCategoryLinks = array_merge( $this->mCategoryLinks, $this->mLanguageLinks );
3558                 $this->mContainsOldMagic = $this->mContainsOldMagic || $other->mContainsOldMagic;
3559         }
3560
3561         /**
3562          * Return true if this cached output object predates the global or
3563          * per-article cache invalidation timestamps, or if it comes from
3564          * an incompatible older version.
3565          *
3566          * @param string $touched the affected article's last touched timestamp
3567          * @return bool
3568          * @access public
3569          */
3570         function expired( $touched ) {
3571                 global $wgCacheEpoch;
3572                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
3573                        $this->getCacheTime() <= $touched ||
3574                        $this->getCacheTime() <= $wgCacheEpoch ||
3575                        !isset( $this->mVersion ) ||
3576                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
3577         }
3578 }
3579
3580 /**
3581  * Set options of the Parser
3582  * @todo document
3583  * @package MediaWiki
3584  */
3585 class ParserOptions
3586 {
3587         # All variables are private
3588         var $mUseTeX;                    # Use texvc to expand <math> tags
3589         var $mUseDynamicDates;           # Use DateFormatter to format dates
3590         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
3591         var $mAllowExternalImages;       # Allow external images inline
3592         var $mSkin;                      # Reference to the preferred skin
3593         var $mDateFormat;                # Date format index
3594         var $mEditSection;               # Create "edit section" links
3595         var $mNumberHeadings;            # Automatically number headings
3596         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
3597
3598         function getUseTeX()                        { return $this->mUseTeX; }
3599         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
3600         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
3601         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
3602         function &getSkin()                         { return $this->mSkin; }
3603         function getDateFormat()                    { return $this->mDateFormat; }
3604         function getEditSection()                   { return $this->mEditSection; }
3605         function getNumberHeadings()                { return $this->mNumberHeadings; }
3606         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
3607
3608
3609         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
3610         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
3611         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
3612         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
3613         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
3614         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
3615         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
3616         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
3617
3618         function setSkin( &$x ) { $this->mSkin =& $x; }
3619
3620         function ParserOptions() {
3621                 global $wgUser;
3622                 $this->initialiseFromUser( $wgUser );
3623         }
3624
3625         /**
3626          * Get parser options
3627          * @static
3628          */
3629         function newFromUser( &$user ) {
3630                 $popts = new ParserOptions;
3631                 $popts->initialiseFromUser( $user );
3632                 return $popts;
3633         }
3634
3635         /** Get user options */
3636         function initialiseFromUser( &$userInput ) {
3637                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages,
3638                        $wgAllowSpecialInclusion;
3639                 $fname = 'ParserOptions::initialiseFromUser';
3640                 wfProfileIn( $fname );
3641                 if ( !$userInput ) {
3642                         $user = new User;
3643                         $user->setLoaded( true );
3644                 } else {
3645                         $user =& $userInput;
3646                 }
3647
3648                 $this->mUseTeX = $wgUseTeX;
3649                 $this->mUseDynamicDates = $wgUseDynamicDates;
3650                 $this->mInterwikiMagic = $wgInterwikiMagic;
3651                 $this->mAllowExternalImages = $wgAllowExternalImages;
3652                 wfProfileIn( $fname.'-skin' );
3653                 $this->mSkin =& $user->getSkin();
3654                 wfProfileOut( $fname.'-skin' );
3655                 $this->mDateFormat = $user->getOption( 'date' );
3656                 $this->mEditSection = true;
3657                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
3658                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
3659                 wfProfileOut( $fname );
3660         }
3661 }
3662
3663 /**
3664  * Callback function used by Parser::replaceLinkHolders()
3665  * to substitute link placeholders.
3666  */
3667 function &wfOutputReplaceMatches( $matches ) {
3668         global $wgOutputReplace;
3669         return $wgOutputReplace[$matches[1]];
3670 }
3671
3672 /**
3673  * Return the total number of articles
3674  */
3675 function wfNumberOfArticles() {
3676         global $wgNumberOfArticles;
3677
3678         wfLoadSiteStats();
3679         return $wgNumberOfArticles;
3680 }
3681
3682 /**
3683  * Return the number of files
3684  */
3685 function wfNumberOfFiles() {
3686         $fname = 'Parser::wfNumberOfFiles';
3687
3688         wfProfileIn( $fname );
3689         $dbr =& wfGetDB( DB_SLAVE );
3690         $res = $dbr->selectField('image', 'COUNT(*)', array(), $fname );
3691         wfProfileOut( $fname );
3692
3693         return $res;
3694 }
3695
3696 /**
3697  * Get various statistics from the database
3698  * @private
3699  */
3700 function wfLoadSiteStats() {
3701         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
3702         $fname = 'wfLoadSiteStats';
3703
3704         if ( -1 != $wgNumberOfArticles ) return;
3705         $dbr =& wfGetDB( DB_SLAVE );
3706         $s = $dbr->selectRow( 'site_stats',
3707                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
3708                 array( 'ss_row_id' => 1 ), $fname
3709         );
3710
3711         if ( $s === false ) {
3712                 return;
3713         } else {
3714                 $wgTotalViews = $s->ss_total_views;
3715                 $wgTotalEdits = $s->ss_total_edits;
3716                 $wgNumberOfArticles = $s->ss_good_articles;
3717         }
3718 }
3719
3720 /**
3721  * Escape html tags
3722  * Basicly replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
3723  *
3724  * @param string $in Text that might contain HTML tags
3725  * @return string Escaped string
3726  */
3727 function wfEscapeHTMLTagsOnly( $in ) {
3728         return str_replace(
3729                 array( '"', '>', '<' ),
3730                 array( '&quot;', '&gt;', '&lt;' ),
3731                 $in );
3732 }
3733
3734 ?>