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', '1.6.0' );
  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 # Constants needed for external link processing
  47 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  48 # Everything except bracket, space, or control characters
  49 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  50 # Including space
  51 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x00-\\x1F\\x7F]' );
  52 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  53 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  54 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  55 define( 'EXT_IMAGE_REGEX',
  56         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  57         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  58         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  59 );
  60
  61 /**
  62  * PHP Parser
  63  *
  64  * Processes wiki markup
  65  *
  66  * <pre>
  67  * There are three main entry points into the Parser class:
  68  * parse()
  69  *   produces HTML output
  70  * preSaveTransform().
  71  *   produces altered wiki markup.
  72  * transformMsg()
  73  *   performs brace substitution on MediaWiki messages
  74  *
  75  * Globals used:
  76  *    objects:   $wgLang
  77  *
  78  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  79  *
  80  * settings:
  81  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  82  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  83  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  84  *
  85  *  * only within ParserOptions
  86  * </pre>
  87  *
  88  * @package MediaWiki
  89  */
  90 class Parser
  91 {
  92         /**#@+
  93          * @access private
  94          */
  95         # Persistent:
  96         var $mTagHooks;
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 100         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 102         var $mTemplates,        // cache of already loaded templates, avoids
 103                                 // multiple SQL queries for the same string
 104             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 105                                 // in this path. Used for loop detection.
 106
 107         # Temporary
 108         # These are variables reset at least once per parse regardless of $clearState
 109         var $mOptions,      // ParserOptions object
 110                 $mTitle,        // Title context, used for self-link rendering and similar things
 111                 $mOutputType,   // Output type, one of the OT_xxx constants
 112                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 113
 114         /**#@-*/
 115
 116         /**
 117          * Constructor
 118          *
 119          * @access public
 120          */
 121         function Parser() {
 122                 $this->mTagHooks = array();
 123                 $this->clearState();
 124         }
 125
 126         /**
 127          * Clear Parser state
 128          *
 129          * @access private
 130          */
 131         function clearState() {
 132                 $this->mOutput = new ParserOutput;
 133                 $this->mAutonumber = 0;
 134                 $this->mLastSection = '';
 135                 $this->mDTopen = false;
 136                 $this->mVariables = false;
 137                 $this->mIncludeCount = array();
 138                 $this->mStripState = array();
 139                 $this->mArgStack = array();
 140                 $this->mInPre = false;
 141                 $this->mInterwikiLinkHolders = array(
 142                         'texts' => array(),
 143                         'titles' => array()
 144                 );
 145                 $this->mLinkHolders = array(
 146                         'namespaces' => array(),
 147                         'dbkeys' => array(),
 148                         'queries' => array(),
 149                         'texts' => array(),
 150                         'titles' => array()
 151                 );
 152                 $this->mRevisionId = null;
 153                 $this->mUniqPrefix = 'UNIQ' . Parser::getRandomString();
 154
 155                 # Clear these on every parse, bug 4549
 156                 $this->mTemplates = array();
 157                 $this->mTemplatePath = array();
 158
 159                 wfRunHooks( 'ParserClearState', array( &$this ) );
 160         }
 161
 162         /**
 163          * Accessor for mUniqPrefix.
 164          *
 165          * @access public
 166          */
 167         function UniqPrefix() {
 168                 return $this->mUniqPrefix;
 169         }
 170
 171         /**
 172          * Convert wikitext to HTML
 173          * Do not call this function recursively.
 174          *
 175          * @access private
 176          * @param string $text Text we want to parse
 177          * @param Title &$title A title object
 178          * @param array $options
 179          * @param boolean $linestart
 180          * @param boolean $clearState
 181          * @param int $revid number to pass in {{REVISIONID}}
 182          * @return ParserOutput a ParserOutput
 183          */
 184         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 185                 /**
 186                  * First pass--just handle <nowiki> sections, pass the rest off
 187                  * to internalParse() which does all the real work.
 188                  */
 189
 190                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 191                 $fname = 'Parser::parse';
 192                 wfProfileIn( $fname );
 193
 194                 if ( $clearState ) {
 195                         $this->clearState();
 196                 }
 197
 198                 $this->mOptions = $options;
 199                 $this->mTitle =& $title;
 200                 $this->mRevisionId = $revid;
 201                 $this->mOutputType = OT_HTML;
 202
 203                 $this->mStripState = NULL;
 204
 205                 //$text = $this->strip( $text, $this->mStripState );
 206                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 207                 $x =& $this->mStripState;
 208
 209                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 210                 $text = $this->strip( $text, $x );
 211                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 212
 213                 # Hook to suspend the parser in this state
 214                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 215                         wfProfileOut( $fname );
 216                         return $text ;
 217                 }
 218
 219                 $text = $this->internalParse( $text );
 220
 221                 $text = $this->unstrip( $text, $this->mStripState );
 222
 223                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 224                 $fixtags = array(
 225                         # french spaces, last one Guillemet-left
 226                         # only if there is something before the space
 227                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 228                         # french spaces, Guillemet-right
 229                         '/(\\302\\253) /' => '\\1&nbsp;',
 230                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 231                 );
 232                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 233
 234                 # only once and last
 235                 $text = $this->doBlockLevels( $text, $linestart );
 236
 237                 $this->replaceLinkHolders( $text );
 238
 239                 # the position of the convert() call should not be changed. it
 240                 # assumes that the links are all replaced and the only thing left
 241                 # is the <nowiki> mark.
 242                 $text = $wgContLang->convert($text);
 243
 244                 # FIXME: Unexpected data flow
 245                 # Set the title text in mOutput to a converted version of the global
 246                 # title. The title is stored in $wgContLang from a previous call to
 247                 # OutputPage::setPageTitle(). If no call has been made, this will be
 248                 # blank, a condition which Parser callers are expected to ignore.
 249                 $this->mOutput->setTitleText($wgContLang->getParsedTitle());
 250
 251                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 252
 253                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 254
 255                 $text = Sanitizer::normalizeCharReferences( $text );
 256
 257                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 258                         $text = Parser::tidy($text);
 259                 }
 260
 261                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 262
 263                 $this->mOutput->setText( $text );
 264                 wfProfileOut( $fname );
 265
 266                 return $this->mOutput;
 267         }
 268
 269         /**
 270          * Get a random string
 271          *
 272          * @access private
 273          * @static
 274          */
 275         function getRandomString() {
 276                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 277         }
 278
 279         function &getTitle() { return $this->mTitle; }
 280         function getOptions() { return $this->mOptions; }
 281
 282         /**
 283          * Replaces all occurrences of <$tag>content</$tag> in the text
 284          * with a random marker and returns the new text. the output parameter
 285          * $content will be an associative array filled with data on the form
 286          * $unique_marker => content.
 287          *
 288          * If $content is already set, the additional entries will be appended
 289          * If $tag is set to STRIP_COMMENTS, the function will extract
 290          * <!-- HTML comments -->
 291          *
 292          * @access private
 293          * @static
 294          */
 295         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 296                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 297                 if ( !$content ) {
 298                         $content = array( );
 299                 }
 300                 $n = 1;
 301                 $stripped = '';
 302
 303                 if ( !$tags ) {
 304                         $tags = array( );
 305                 }
 306
 307                 if ( !$params ) {
 308                         $params = array( );
 309                 }
 310
 311                 if( $tag == STRIP_COMMENTS ) {
 312                         $start = '/<!--()()/';
 313                         $end   = '/-->/';
 314                 } else {
 315                         $start = "/<$tag(\\s+[^\\/>]*|\\s*)(\\/?)>/i";
 316                         $end   = "/<\\/$tag\\s*>/i";
 317                 }
 318
 319                 while ( '' != $text ) {
 320                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 321                         $stripped .= $p[0];
 322                         if( count( $p ) < 4 ) {
 323                                 break;
 324                         }
 325                         $attributes = $p[1];
 326                         $empty      = $p[2];
 327                         $inside     = $p[3];
 328
 329                         $marker = $rnd . sprintf('%08X', $n++);
 330                         $stripped .= $marker;
 331
 332                         $tags[$marker] = "<$tag$attributes$empty>";
 333                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 334
 335                         if ( $empty === '/' ) {
 336                                 // Empty element tag, <tag />
 337                                 $content[$marker] = null;
 338                                 $text = $inside;
 339                         } else {
 340                                 $q = preg_split( $end, $inside, 2 );
 341                                 $content[$marker] = $q[0];
 342                                 if( count( $q ) < 2 ) {
 343                                         # No end tag -- let it run out to the end of the text.
 344                                         break;
 345                                 } else {
 346                                         $text = $q[1];
 347                                 }
 348                         }
 349                 }
 350                 return $stripped;
 351         }
 352
 353         /**
 354          * Wrapper function for extractTagsAndParams
 355          * for cases where $tags and $params isn't needed
 356          * i.e. where tags will never have params, like <nowiki>
 357          *
 358          * @access private
 359          * @static
 360          */
 361         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 362                 $dummy_tags = array();
 363                 $dummy_params = array();
 364
 365                 return Parser::extractTagsAndParams( $tag, $text, $content,
 366                         $dummy_tags, $dummy_params, $uniq_prefix );
 367         }
 368
 369         /**
 370          * Strips and renders nowiki, pre, math, hiero
 371          * If $render is set, performs necessary rendering operations on plugins
 372          * Returns the text, and fills an array with data needed in unstrip()
 373          * If the $state is already a valid strip state, it adds to the state
 374          *
 375          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 376          *  will be stripped in addition to other tags. This is important
 377          *  for section editing, where these comments cause confusion when
 378          *  counting the sections in the wikisource
 379          *
 380          * @access private
 381          */
 382         function strip( $text, &$state, $stripcomments = false ) {
 383                 $render = ($this->mOutputType == OT_HTML);
 384                 $html_content = array();
 385                 $nowiki_content = array();
 386                 $math_content = array();
 387                 $pre_content = array();
 388                 $comment_content = array();
 389                 $ext_content = array();
 390                 $ext_tags = array();
 391                 $ext_params = array();
 392                 $gallery_content = array();
 393
 394                 # Replace any instances of the placeholders
 395                 $uniq_prefix = $this->mUniqPrefix;
 396                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 397
 398                 # html
 399                 global $wgRawHtml;
 400                 if( $wgRawHtml ) {
 401                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 402                         foreach( $html_content as $marker => $content ) {
 403                                 if ($render ) {
 404                                         # Raw and unchecked for validity.
 405                                         $html_content[$marker] = $content;
 406                                 } else {
 407                                         $html_content[$marker] = '<html>'.$content.'</html>';
 408                                 }
 409                         }
 410                 }
 411
 412                 # nowiki
 413                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 414                 foreach( $nowiki_content as $marker => $content ) {
 415                         if( $render ){
 416                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 417                         } else {
 418                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 419                         }
 420                 }
 421
 422                 # math
 423                 if( $this->mOptions->getUseTeX() ) {
 424                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 425                         foreach( $math_content as $marker => $content ){
 426                                 if( $render ) {
 427                                         $math_content[$marker] = renderMath( $content );
 428                                 } else {
 429                                         $math_content[$marker] = '<math>'.$content.'</math>';
 430                                 }
 431                         }
 432                 }
 433
 434                 # pre
 435                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 436                 foreach( $pre_content as $marker => $content ){
 437                         if( $render ){
 438                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 439                         } else {
 440                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 441                         }
 442                 }
 443
 444                 # gallery
 445                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 446                 foreach( $gallery_content as $marker => $content ) {
 447                         require_once( 'ImageGallery.php' );
 448                         if ( $render ) {
 449                                 $gallery_content[$marker] = $this->renderImageGallery( $content );
 450                         } else {
 451                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 452                         }
 453                 }
 454
 455                 # Comments
 456                 if($stripcomments) {
 457                         $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 458                         foreach( $comment_content as $marker => $content ){
 459                                 $comment_content[$marker] = '<!--'.$content.'-->';
 460                         }
 461                 }
 462
 463                 # Extensions
 464                 foreach ( $this->mTagHooks as $tag => $callback ) {
 465                         $ext_content[$tag] = array();
 466                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 467                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 468                         foreach( $ext_content[$tag] as $marker => $content ) {
 469                                 $full_tag = $ext_tags[$tag][$marker];
 470                                 $params = $ext_params[$tag][$marker];
 471                                 if ( $render )
 472                                         $ext_content[$tag][$marker] = call_user_func_array( $callback, array( $content, $params, &$this ) );
 473                                 else {
 474                                         if ( is_null( $content ) ) {
 475                                                 // Empty element tag
 476                                                 $ext_content[$tag][$marker] = $full_tag;
 477                                         } else {
 478                                                 $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 479                                         }
 480                                 }
 481                         }
 482                 }
 483
 484                 # Merge state with the pre-existing state, if there is one
 485                 if ( $state ) {
 486                         $state['html'] = $state['html'] + $html_content;
 487                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 488                         $state['math'] = $state['math'] + $math_content;
 489                         $state['pre'] = $state['pre'] + $pre_content;
 490                         $state['gallery'] = $state['gallery'] + $gallery_content;
 491                         $state['comment'] = $state['comment'] + $comment_content;
 492
 493                         foreach( $ext_content as $tag => $array ) {
 494                                 if ( array_key_exists( $tag, $state ) ) {
 495                                         $state[$tag] = $state[$tag] + $array;
 496                                 }
 497                         }
 498                 } else {
 499                         $state = array(
 500                           'html' => $html_content,
 501                           'nowiki' => $nowiki_content,
 502                           'math' => $math_content,
 503                           'pre' => $pre_content,
 504                           'gallery' => $gallery_content,
 505                           'comment' => $comment_content,
 506                         ) + $ext_content;
 507                 }
 508                 return $text;
 509         }
 510
 511         /**
 512          * restores pre, math, and hiero removed by strip()
 513          *
 514          * always call unstripNoWiki() after this one
 515          * @access private
 516          */
 517         function unstrip( $text, &$state ) {
 518                 if ( !is_array( $state ) ) {
 519                         return $text;
 520                 }
 521
 522                 # Must expand in reverse order, otherwise nested tags will be corrupted
 523                 foreach( array_reverse( $state, true ) as $tag => $contentDict ) {
 524                         if( $tag != 'nowiki' && $tag != 'html' ) {
 525                                 foreach( array_reverse( $contentDict, true ) as $uniq => $content ) {
 526                                         $text = str_replace( $uniq, $content, $text );
 527                                 }
 528                         }
 529                 }
 530
 531                 return $text;
 532         }
 533
 534         /**
 535          * always call this after unstrip() to preserve the order
 536          *
 537          * @access private
 538          */
 539         function unstripNoWiki( $text, &$state ) {
 540                 if ( !is_array( $state ) ) {
 541                         return $text;
 542                 }
 543
 544                 # Must expand in reverse order, otherwise nested tags will be corrupted
 545                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 546                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 547                 }
 548
 549                 global $wgRawHtml;
 550                 if ($wgRawHtml) {
 551                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 552                                 $text = str_replace( key( $state['html'] ), $content, $text );
 553                         }
 554                 }
 555
 556                 return $text;
 557         }
 558
 559         /**
 560          * Add an item to the strip state
 561          * Returns the unique tag which must be inserted into the stripped text
 562          * The tag will be replaced with the original text in unstrip()
 563          *
 564          * @access private
 565          */
 566         function insertStripItem( $text, &$state ) {
 567                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 568                 if ( !$state ) {
 569                         $state = array(
 570                           'html' => array(),
 571                           'nowiki' => array(),
 572                           'math' => array(),
 573                           'pre' => array(),
 574                           'comment' => array(),
 575                           'gallery' => array(),
 576                         );
 577                 }
 578                 $state['item'][$rnd] = $text;
 579                 return $rnd;
 580         }
 581
 582         /**
 583          * Interface with html tidy, used if $wgUseTidy = true.
 584          * If tidy isn't able to correct the markup, the original will be
 585          * returned in all its glory with a warning comment appended.
 586          *
 587          * Either the external tidy program or the in-process tidy extension
 588          * will be used depending on availability. Override the default
 589          * $wgTidyInternal setting to disable the internal if it's not working.
 590          *
 591          * @param string $text Hideous HTML input
 592          * @return string Corrected HTML output
 593          * @access public
 594          * @static
 595          */
 596         function tidy( $text ) {
 597                 global $wgTidyInternal;
 598                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 599 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 600 '<head><title>test</title></head><body>'.$text.'</body></html>';
 601                 if( $wgTidyInternal ) {
 602                         $correctedtext = Parser::internalTidy( $wrappedtext );
 603                 } else {
 604                         $correctedtext = Parser::externalTidy( $wrappedtext );
 605                 }
 606                 if( is_null( $correctedtext ) ) {
 607                         wfDebug( "Tidy error detected!\n" );
 608                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 609                 }
 610                 return $correctedtext;
 611         }
 612
 613         /**
 614          * Spawn an external HTML tidy process and get corrected markup back from it.
 615          *
 616          * @access private
 617          * @static
 618          */
 619         function externalTidy( $text ) {
 620                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 621                 $fname = 'Parser::externalTidy';
 622                 wfProfileIn( $fname );
 623
 624                 $cleansource = '';
 625                 $opts = ' -utf8';
 626
 627                 $descriptorspec = array(
 628                         0 => array('pipe', 'r'),
 629                         1 => array('pipe', 'w'),
 630                         2 => array('file', '/dev/null', 'a')
 631                 );
 632                 $pipes = array();
 633                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 634                 if (is_resource($process)) {
 635                         // Theoretically, this style of communication could cause a deadlock
 636                         // here. If the stdout buffer fills up, then writes to stdin could
 637                         // block. This doesn't appear to happen with tidy, because tidy only
 638                         // writes to stdout after it's finished reading from stdin. Search
 639                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 640                         fwrite($pipes[0], $text);
 641                         fclose($pipes[0]);
 642                         while (!feof($pipes[1])) {
 643                                 $cleansource .= fgets($pipes[1], 1024);
 644                         }
 645                         fclose($pipes[1]);
 646                         proc_close($process);
 647                 }
 648
 649                 wfProfileOut( $fname );
 650
 651                 if( $cleansource == '' && $text != '') {
 652                         // Some kind of error happened, so we couldn't get the corrected text.
 653                         // Just give up; we'll use the source text and append a warning.
 654                         return null;
 655                 } else {
 656                         return $cleansource;
 657                 }
 658         }
 659
 660         /**
 661          * Use the HTML tidy PECL extension to use the tidy library in-process,
 662          * saving the overhead of spawning a new process. Currently written to
 663          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 664          *
 665          * 'pear install tidy' should be able to compile the extension module.
 666          *
 667          * @access private
 668          * @static
 669          */
 670         function internalTidy( $text ) {
 671                 global $wgTidyConf;
 672                 $fname = 'Parser::internalTidy';
 673                 wfProfileIn( $fname );
 674
 675                 tidy_load_config( $wgTidyConf );
 676                 tidy_set_encoding( 'utf8' );
 677                 tidy_parse_string( $text );
 678                 tidy_clean_repair();
 679                 if( tidy_get_status() == 2 ) {
 680                         // 2 is magic number for fatal error
 681                         // http://www.php.net/manual/en/function.tidy-get-status.php
 682                         $cleansource = null;
 683                 } else {
 684                         $cleansource = tidy_get_output();
 685                 }
 686                 wfProfileOut( $fname );
 687                 return $cleansource;
 688         }
 689
 690         /**
 691          * parse the wiki syntax used to render tables
 692          *
 693          * @access private
 694          */
 695         function doTableStuff ( $t ) {
 696                 $fname = 'Parser::doTableStuff';
 697                 wfProfileIn( $fname );
 698
 699                 $t = explode ( "\n" , $t ) ;
 700                 $td = array () ; # Is currently a td tag open?
 701                 $ltd = array () ; # Was it TD or TH?
 702                 $tr = array () ; # Is currently a tr tag open?
 703                 $ltr = array () ; # tr attributes
 704                 $has_opened_tr = array(); # Did this table open a <tr> element?
 705                 $indent_level = 0; # indent level of the table
 706                 foreach ( $t AS $k => $x )
 707                 {
 708                         $x = trim ( $x ) ;
 709                         $fc = substr ( $x , 0 , 1 ) ;
 710                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 711                                 $indent_level = strlen( $matches[1] );
 712
 713                                 $attributes = $this->unstripForHTML( $matches[2] );
 714
 715                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 716                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 717                                 array_push ( $td , false ) ;
 718                                 array_push ( $ltd , '' ) ;
 719                                 array_push ( $tr , false ) ;
 720                                 array_push ( $ltr , '' ) ;
 721                                 array_push ( $has_opened_tr, false );
 722                         }
 723                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 724                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 725                                 $z = "</table>" . substr ( $x , 2);
 726                                 $l = array_pop ( $ltd ) ;
 727                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 728                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 729                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 730                                 array_pop ( $ltr ) ;
 731                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 732                         }
 733                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 734                                 $x = substr ( $x , 1 ) ;
 735                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 736                                 $z = '' ;
 737                                 $l = array_pop ( $ltd ) ;
 738                                 array_pop ( $has_opened_tr );
 739                                 array_push ( $has_opened_tr , true ) ;
 740                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 741                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 742                                 array_pop ( $ltr ) ;
 743                                 $t[$k] = $z ;
 744                                 array_push ( $tr , false ) ;
 745                                 array_push ( $td , false ) ;
 746                                 array_push ( $ltd , '' ) ;
 747                                 $attributes = $this->unstripForHTML( $x );
 748                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 749                         }
 750                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 751                                 # $x is a table row
 752                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 753                                         $fc = '+' ;
 754                                         $x = substr ( $x , 1 ) ;
 755                                 }
 756                                 $after = substr ( $x , 1 ) ;
 757                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 758                                 $after = explode ( '||' , $after ) ;
 759                                 $t[$k] = '' ;
 760
 761                                 # Loop through each table cell
 762                                 foreach ( $after AS $theline )
 763                                 {
 764                                         $z = '' ;
 765                                         if ( $fc != '+' )
 766                                         {
 767                                                 $tra = array_pop ( $ltr ) ;
 768                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 769                                                 array_push ( $tr , true ) ;
 770                                                 array_push ( $ltr , '' ) ;
 771                                                 array_pop ( $has_opened_tr );
 772                                                 array_push ( $has_opened_tr , true ) ;
 773                                         }
 774
 775                                         $l = array_pop ( $ltd ) ;
 776                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 777                                         if ( $fc == '|' ) $l = 'td' ;
 778                                         else if ( $fc == '!' ) $l = 'th' ;
 779                                         else if ( $fc == '+' ) $l = 'caption' ;
 780                                         else $l = '' ;
 781                                         array_push ( $ltd , $l ) ;
 782
 783                                         # Cell parameters
 784                                         $y = explode ( '|' , $theline , 2 ) ;
 785                                         # Note that a '|' inside an invalid link should not
 786                                         # be mistaken as delimiting cell parameters
 787                                         if ( strpos( $y[0], '[[' ) !== false ) {
 788                                                 $y = array ($theline);
 789                                         }
 790                                         if ( count ( $y ) == 1 )
 791                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 792                                         else {
 793                                                 $attributes = $this->unstripForHTML( $y[0] );
 794                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 795                                         }
 796                                         $t[$k] .= $y ;
 797                                         array_push ( $td , true ) ;
 798                                 }
 799                         }
 800                 }
 801
 802                 # Closing open td, tr && table
 803                 while ( count ( $td ) > 0 )
 804                 {
 805                         $l = array_pop ( $ltd ) ;
 806                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 807                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 808                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 809                         $t[] = '</table>' ;
 810                 }
 811
 812                 $t = implode ( "\n" , $t ) ;
 813                 wfProfileOut( $fname );
 814                 return $t ;
 815         }
 816
 817         /**
 818          * Helper function for parse() that transforms wiki markup into
 819          * HTML. Only called for $mOutputType == OT_HTML.
 820          *
 821          * @access private
 822          */
 823         function internalParse( $text ) {
 824                 global $wgContLang;
 825                 $args = array();
 826                 $isMain = true;
 827                 $fname = 'Parser::internalParse';
 828                 wfProfileIn( $fname );
 829
 830                 # Remove <noinclude> tags and <includeonly> sections
 831                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 832                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 833                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 834
 835                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 836                 $text = $this->replaceVariables( $text, $args );
 837
 838                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 839
 840                 $text = $this->doHeadings( $text );
 841                 if($this->mOptions->getUseDynamicDates()) {
 842                         $df =& DateFormatter::getInstance();
 843                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 844                 }
 845                 $text = $this->doAllQuotes( $text );
 846                 $text = $this->replaceInternalLinks( $text );
 847                 $text = $this->replaceExternalLinks( $text );
 848
 849                 # replaceInternalLinks may sometimes leave behind
 850                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 851                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 852
 853                 $text = $this->doMagicLinks( $text );
 854                 $text = $this->doTableStuff( $text );
 855                 $text = $this->formatHeadings( $text, $isMain );
 856
 857                 wfProfileOut( $fname );
 858                 return $text;
 859         }
 860
 861         /**
 862          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 863          * magic external links.
 864          *
 865          * @access private
 866          */
 867         function &doMagicLinks( &$text ) {
 868                 $text = $this->magicISBN( $text );
 869                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 870                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 871                 return $text;
 872         }
 873
 874         /**
 875          * Parse headers and return html
 876          *
 877          * @access private
 878          */
 879         function doHeadings( $text ) {
 880                 $fname = 'Parser::doHeadings';
 881                 wfProfileIn( $fname );
 882                 for ( $i = 6; $i >= 1; --$i ) {
 883                         $h = str_repeat( '=', $i );
 884                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 885                           "<h{$i}>\\1</h{$i}>\\2", $text );
 886                 }
 887                 wfProfileOut( $fname );
 888                 return $text;
 889         }
 890
 891         /**
 892          * Replace single quotes with HTML markup
 893          * @access private
 894          * @return string the altered text
 895          */
 896         function doAllQuotes( $text ) {
 897                 $fname = 'Parser::doAllQuotes';
 898                 wfProfileIn( $fname );
 899                 $outtext = '';
 900                 $lines = explode( "\n", $text );
 901                 foreach ( $lines as $line ) {
 902                         $outtext .= $this->doQuotes ( $line ) . "\n";
 903                 }
 904                 $outtext = substr($outtext, 0,-1);
 905                 wfProfileOut( $fname );
 906                 return $outtext;
 907         }
 908
 909         /**
 910          * Helper function for doAllQuotes()
 911          * @access private
 912          */
 913         function doQuotes( $text ) {
 914                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 915                 if ( count( $arr ) == 1 )
 916                         return $text;
 917                 else
 918                 {
 919                         # First, do some preliminary work. This may shift some apostrophes from
 920                         # being mark-up to being text. It also counts the number of occurrences
 921                         # of bold and italics mark-ups.
 922                         $i = 0;
 923                         $numbold = 0;
 924                         $numitalics = 0;
 925                         foreach ( $arr as $r )
 926                         {
 927                                 if ( ( $i % 2 ) == 1 )
 928                                 {
 929                                         # If there are ever four apostrophes, assume the first is supposed to
 930                                         # be text, and the remaining three constitute mark-up for bold text.
 931                                         if ( strlen( $arr[$i] ) == 4 )
 932                                         {
 933                                                 $arr[$i-1] .= "'";
 934                                                 $arr[$i] = "'''";
 935                                         }
 936                                         # If there are more than 5 apostrophes in a row, assume they're all
 937                                         # text except for the last 5.
 938                                         else if ( strlen( $arr[$i] ) > 5 )
 939                                         {
 940                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 941                                                 $arr[$i] = "'''''";
 942                                         }
 943                                         # Count the number of occurrences of bold and italics mark-ups.
 944                                         # We are not counting sequences of five apostrophes.
 945                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 946                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 947                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 948                                 }
 949                                 $i++;
 950                         }
 951
 952                         # If there is an odd number of both bold and italics, it is likely
 953                         # that one of the bold ones was meant to be an apostrophe followed
 954                         # by italics. Which one we cannot know for certain, but it is more
 955                         # likely to be one that has a single-letter word before it.
 956                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 957                         {
 958                                 $i = 0;
 959                                 $firstsingleletterword = -1;
 960                                 $firstmultiletterword = -1;
 961                                 $firstspace = -1;
 962                                 foreach ( $arr as $r )
 963                                 {
 964                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 965                                         {
 966                                                 $x1 = substr ($arr[$i-1], -1);
 967                                                 $x2 = substr ($arr[$i-1], -2, 1);
 968                                                 if ($x1 == ' ') {
 969                                                         if ($firstspace == -1) $firstspace = $i;
 970                                                 } else if ($x2 == ' ') {
 971                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 972                                                 } else {
 973                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 974                                                 }
 975                                         }
 976                                         $i++;
 977                                 }
 978
 979                                 # If there is a single-letter word, use it!
 980                                 if ($firstsingleletterword > -1)
 981                                 {
 982                                         $arr [ $firstsingleletterword ] = "''";
 983                                         $arr [ $firstsingleletterword-1 ] .= "'";
 984                                 }
 985                                 # If not, but there's a multi-letter word, use that one.
 986                                 else if ($firstmultiletterword > -1)
 987                                 {
 988                                         $arr [ $firstmultiletterword ] = "''";
 989                                         $arr [ $firstmultiletterword-1 ] .= "'";
 990                                 }
 991                                 # ... otherwise use the first one that has neither.
 992                                 # (notice that it is possible for all three to be -1 if, for example,
 993                                 # there is only one pentuple-apostrophe in the line)
 994                                 else if ($firstspace > -1)
 995                                 {
 996                                         $arr [ $firstspace ] = "''";
 997                                         $arr [ $firstspace-1 ] .= "'";
 998                                 }
 999                         }
1000
1001                         # Now let's actually convert our apostrophic mush to HTML!
1002                         $output = '';
1003                         $buffer = '';
1004                         $state = '';
1005                         $i = 0;
1006                         foreach ($arr as $r)
1007                         {
1008                                 if (($i % 2) == 0)
1009                                 {
1010                                         if ($state == 'both')
1011                                                 $buffer .= $r;
1012                                         else
1013                                                 $output .= $r;
1014                                 }
1015                                 else
1016                                 {
1017                                         if (strlen ($r) == 2)
1018                                         {
1019                                                 if ($state == 'i')
1020                                                 { $output .= '</i>'; $state = ''; }
1021                                                 else if ($state == 'bi')
1022                                                 { $output .= '</i>'; $state = 'b'; }
1023                                                 else if ($state == 'ib')
1024                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1025                                                 else if ($state == 'both')
1026                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1027                                                 else # $state can be 'b' or ''
1028                                                 { $output .= '<i>'; $state .= 'i'; }
1029                                         }
1030                                         else if (strlen ($r) == 3)
1031                                         {
1032                                                 if ($state == 'b')
1033                                                 { $output .= '</b>'; $state = ''; }
1034                                                 else if ($state == 'bi')
1035                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1036                                                 else if ($state == 'ib')
1037                                                 { $output .= '</b>'; $state = 'i'; }
1038                                                 else if ($state == 'both')
1039                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1040                                                 else # $state can be 'i' or ''
1041                                                 { $output .= '<b>'; $state .= 'b'; }
1042                                         }
1043                                         else if (strlen ($r) == 5)
1044                                         {
1045                                                 if ($state == 'b')
1046                                                 { $output .= '</b><i>'; $state = 'i'; }
1047                                                 else if ($state == 'i')
1048                                                 { $output .= '</i><b>'; $state = 'b'; }
1049                                                 else if ($state == 'bi')
1050                                                 { $output .= '</i></b>'; $state = ''; }
1051                                                 else if ($state == 'ib')
1052                                                 { $output .= '</b></i>'; $state = ''; }
1053                                                 else if ($state == 'both')
1054                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1055                                                 else # ($state == '')
1056                                                 { $buffer = ''; $state = 'both'; }
1057                                         }
1058                                 }
1059                                 $i++;
1060                         }
1061                         # Now close all remaining tags.  Notice that the order is important.
1062                         if ($state == 'b' || $state == 'ib')
1063                                 $output .= '</b>';
1064                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1065                                 $output .= '</i>';
1066                         if ($state == 'bi')
1067                                 $output .= '</b>';
1068                         if ($state == 'both')
1069                                 $output .= '<b><i>'.$buffer.'</i></b>';
1070                         return $output;
1071                 }
1072         }
1073
1074         /**
1075          * Replace external links
1076          *
1077          * Note: this is all very hackish and the order of execution matters a lot.
1078          * Make sure to run maintenance/parserTests.php if you change this code.
1079          *
1080          * @access private
1081          */
1082         function replaceExternalLinks( $text ) {
1083                 global $wgContLang;
1084                 $fname = 'Parser::replaceExternalLinks';
1085                 wfProfileIn( $fname );
1086
1087                 $sk =& $this->mOptions->getSkin();
1088
1089                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1090
1091                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1092
1093                 $i = 0;
1094                 while ( $i<count( $bits ) ) {
1095                         $url = $bits[$i++];
1096                         $protocol = $bits[$i++];
1097                         $text = $bits[$i++];
1098                         $trail = $bits[$i++];
1099
1100                         # The characters '<' and '>' (which were escaped by
1101                         # removeHTMLtags()) should not be included in
1102                         # URLs, per RFC 2396.
1103                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1104                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1105                                 $url = substr($url, 0, $m2[0][1]);
1106                         }
1107
1108                         # If the link text is an image URL, replace it with an <img> tag
1109                         # This happened by accident in the original parser, but some people used it extensively
1110                         $img = $this->maybeMakeExternalImage( $text );
1111                         if ( $img !== false ) {
1112                                 $text = $img;
1113                         }
1114
1115                         $dtrail = '';
1116
1117                         # Set linktype for CSS - if URL==text, link is essentially free
1118                         $linktype = ($text == $url) ? 'free' : 'text';
1119
1120                         # No link text, e.g. [http://domain.tld/some.link]
1121                         if ( $text == '' ) {
1122                                 # Autonumber if allowed
1123                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1124                                         $text = '[' . ++$this->mAutonumber . ']';
1125                                         $linktype = 'autonumber';
1126                                 } else {
1127                                         # Otherwise just use the URL
1128                                         $text = htmlspecialchars( $url );
1129                                         $linktype = 'free';
1130                                 }
1131                         } else {
1132                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1133                                 # Check for trail
1134                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1135                         }
1136
1137                         $text = $wgContLang->markNoConversion($text);
1138
1139                         # Replace &amp; from obsolete syntax with &.
1140                         # All HTML entities will be escaped by makeExternalLink()
1141                         $url = str_replace( '&amp;', '&', $url );
1142                         # Replace unnecessary URL escape codes with the referenced character
1143                         # This prevents spammers from hiding links from the filters
1144                         $url = Parser::replaceUnusualEscapes( $url );
1145
1146                         # Process the trail (i.e. everything after this link up until start of the next link),
1147                         # replacing any non-bracketed links
1148                         $trail = $this->replaceFreeExternalLinks( $trail );
1149
1150                         # Use the encoded URL
1151                         # This means that users can paste URLs directly into the text
1152                         # Funny characters like &ouml; aren't valid in URLs anyway
1153                         # This was changed in August 2004
1154                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1155
1156                         # Register link in the output object
1157                         $this->mOutput->addExternalLink( $url );
1158                 }
1159
1160                 wfProfileOut( $fname );
1161                 return $s;
1162         }
1163
1164         /**
1165          * Replace anything that looks like a URL with a link
1166          * @access private
1167          */
1168         function replaceFreeExternalLinks( $text ) {
1169                 global $wgContLang;
1170                 $fname = 'Parser::replaceFreeExternalLinks';
1171                 wfProfileIn( $fname );
1172
1173                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1174                 $s = array_shift( $bits );
1175                 $i = 0;
1176
1177                 $sk =& $this->mOptions->getSkin();
1178
1179                 while ( $i < count( $bits ) ){
1180                         $protocol = $bits[$i++];
1181                         $remainder = $bits[$i++];
1182
1183                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1184                                 # Found some characters after the protocol that look promising
1185                                 $url = $protocol . $m[1];
1186                                 $trail = $m[2];
1187
1188                                 # The characters '<' and '>' (which were escaped by
1189                                 # removeHTMLtags()) should not be included in
1190                                 # URLs, per RFC 2396.
1191                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1192                                         $trail = substr($url, $m2[0][1]) . $trail;
1193                                         $url = substr($url, 0, $m2[0][1]);
1194                                 }
1195
1196                                 # Move trailing punctuation to $trail
1197                                 $sep = ',;\.:!?';
1198                                 # If there is no left bracket, then consider right brackets fair game too
1199                                 if ( strpos( $url, '(' ) === false ) {
1200                                         $sep .= ')';
1201                                 }
1202
1203                                 $numSepChars = strspn( strrev( $url ), $sep );
1204                                 if ( $numSepChars ) {
1205                                         $trail = substr( $url, -$numSepChars ) . $trail;
1206                                         $url = substr( $url, 0, -$numSepChars );
1207                                 }
1208
1209                                 # Replace &amp; from obsolete syntax with &.
1210                                 # All HTML entities will be escaped by makeExternalLink()
1211                                 # or maybeMakeExternalImage()
1212                                 $url = str_replace( '&amp;', '&', $url );
1213                                 # Replace unnecessary URL escape codes with their equivalent characters
1214                                 $url = Parser::replaceUnusualEscapes( $url );
1215
1216                                 # Is this an external image?
1217                                 $text = $this->maybeMakeExternalImage( $url );
1218                                 if ( $text === false ) {
1219                                         # Not an image, make a link
1220                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1221                                         # Register it in the output object
1222                                         $this->mOutput->addExternalLink( $url );
1223                                 }
1224                                 $s .= $text . $trail;
1225                         } else {
1226                                 $s .= $protocol . $remainder;
1227                         }
1228                 }
1229                 wfProfileOut( $fname );
1230                 return $s;
1231         }
1232
1233         /**
1234          * Replace unusual URL escape codes with their equivalent characters
1235          * @param string
1236          * @return string
1237          * @static
1238          */
1239         function replaceUnusualEscapes( $url ) {
1240                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1241                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1242         }
1243
1244         /**
1245          * Callback function used in replaceUnusualEscapes().
1246          * Replaces unusual URL escape codes with their equivalent character
1247          * @static
1248          * @access private
1249          */
1250         function replaceUnusualEscapesCallback( $matches ) {
1251                 $char = urldecode( $matches[0] );
1252                 $ord = ord( $char );
1253                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1254                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1255                         // No, shouldn't be escaped
1256                         return $char;
1257                 } else {
1258                         // Yes, leave it escaped
1259                         return $matches[0];
1260                 }
1261         }
1262
1263         /**
1264          * make an image if it's allowed, either through the global
1265          * option or through the exception
1266          * @access private
1267          */
1268         function maybeMakeExternalImage( $url ) {
1269                 $sk =& $this->mOptions->getSkin();
1270                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1271                 $imagesexception = !empty($imagesfrom);
1272                 $text = false;
1273                 if ( $this->mOptions->getAllowExternalImages()
1274                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1275                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1276                                 # Image found
1277                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1278                         }
1279                 }
1280                 return $text;
1281         }
1282
1283         /**
1284          * Process [[ ]] wikilinks
1285          *
1286          * @access private
1287          */
1288         function replaceInternalLinks( $s ) {
1289                 global $wgContLang;
1290                 static $fname = 'Parser::replaceInternalLinks' ;
1291
1292                 wfProfileIn( $fname );
1293
1294                 wfProfileIn( $fname.'-setup' );
1295                 static $tc = FALSE;
1296                 # the % is needed to support urlencoded titles as well
1297                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1298
1299                 $sk =& $this->mOptions->getSkin();
1300
1301                 #split the entire text string on occurences of [[
1302                 $a = explode( '[[', ' ' . $s );
1303                 #get the first element (all text up to first [[), and remove the space we added
1304                 $s = array_shift( $a );
1305                 $s = substr( $s, 1 );
1306
1307                 # Match a link having the form [[namespace:link|alternate]]trail
1308                 static $e1 = FALSE;
1309                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1310                 # Match cases where there is no "]]", which might still be images
1311                 static $e1_img = FALSE;
1312                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1313                 # Match the end of a line for a word that's not followed by whitespace,
1314                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1315                 $e2 = wfMsgForContent( 'linkprefix' );
1316
1317                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1318
1319                 if( is_null( $this->mTitle ) ) {
1320                         wfDebugDieBacktrace( 'nooo' );
1321                 }
1322                 $nottalk = !$this->mTitle->isTalkPage();
1323
1324                 if ( $useLinkPrefixExtension ) {
1325                         if ( preg_match( $e2, $s, $m ) ) {
1326                                 $first_prefix = $m[2];
1327                         } else {
1328                                 $first_prefix = false;
1329                         }
1330                 } else {
1331                         $prefix = '';
1332                 }
1333
1334                 $selflink = $this->mTitle->getPrefixedText();
1335                 wfProfileOut( $fname.'-setup' );
1336
1337                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1338                 $useSubpages = $this->areSubpagesAllowed();
1339
1340                 # Loop for each link
1341                 for ($k = 0; isset( $a[$k] ); $k++) {
1342                         $line = $a[$k];
1343                         if ( $useLinkPrefixExtension ) {
1344                                 wfProfileIn( $fname.'-prefixhandling' );
1345                                 if ( preg_match( $e2, $s, $m ) ) {
1346                                         $prefix = $m[2];
1347                                         $s = $m[1];
1348                                 } else {
1349                                         $prefix='';
1350                                 }
1351                                 # first link
1352                                 if($first_prefix) {
1353                                         $prefix = $first_prefix;
1354                                         $first_prefix = false;
1355                                 }
1356                                 wfProfileOut( $fname.'-prefixhandling' );
1357                         }
1358
1359                         $might_be_img = false;
1360
1361                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1362                                 $text = $m[2];
1363                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1364                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1365                                 # the real problem is with the $e1 regex
1366                                 # See bug 1300.
1367                                 #
1368                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1369                                 # and no image is in sight. See bug 2095.
1370                                 #
1371                                 if( $text !== '' && preg_match( "/^\](.*)/s", $m[3], $n ) ) {
1372                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1373                                         $m[3] = $n[1];
1374                                 }
1375                                 # fix up urlencoded title texts
1376                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1377                                 $trail = $m[3];
1378                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1379                                 $might_be_img = true;
1380                                 $text = $m[2];
1381                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1382                                 $trail = "";
1383                         } else { # Invalid form; output directly
1384                                 $s .= $prefix . '[[' . $line ;
1385                                 continue;
1386                         }
1387
1388                         # Don't allow internal links to pages containing
1389                         # PROTO: where PROTO is a valid URL protocol; these
1390                         # should be external links.
1391                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1392                                 $s .= $prefix . '[[' . $line ;
1393                                 continue;
1394                         }
1395
1396                         # Make subpage if necessary
1397                         if( $useSubpages ) {
1398                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1399                         } else {
1400                                 $link = $m[1];
1401                         }
1402
1403                         $noforce = (substr($m[1], 0, 1) != ':');
1404                         if (!$noforce) {
1405                                 # Strip off leading ':'
1406                                 $link = substr($link, 1);
1407                         }
1408
1409                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1410                         if( !$nt ) {
1411                                 $s .= $prefix . '[[' . $line;
1412                                 continue;
1413                         }
1414
1415                         #check other language variants of the link
1416                         #if the article does not exist
1417                         if( $checkVariantLink
1418                             && $nt->getArticleID() == 0 ) {
1419                                 $wgContLang->findVariantLink($link, $nt);
1420                         }
1421
1422                         $ns = $nt->getNamespace();
1423                         $iw = $nt->getInterWiki();
1424
1425                         if ($might_be_img) { # if this is actually an invalid link
1426                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1427                                         $found = false;
1428                                         while (isset ($a[$k+1]) ) {
1429                                                 #look at the next 'line' to see if we can close it there
1430                                                 $spliced = array_splice( $a, $k + 1, 1 );
1431                                                 $next_line = array_shift( $spliced );
1432                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1433                                                 # the first ]] closes the inner link, the second the image
1434                                                         $found = true;
1435                                                         $text .= '[[' . $m[1];
1436                                                         $trail = $m[2];
1437                                                         break;
1438                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1439                                                         #if there's exactly one ]] that's fine, we'll keep looking
1440                                                         $text .= '[[' . $m[0];
1441                                                 } else {
1442                                                         #if $next_line is invalid too, we need look no further
1443                                                         $text .= '[[' . $next_line;
1444                                                         break;
1445                                                 }
1446                                         }
1447                                         if ( !$found ) {
1448                                                 # we couldn't find the end of this imageLink, so output it raw
1449                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1450                                                 $text = $this->replaceInternalLinks($text);
1451                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1452                                                 # note: no $trail, because without an end, there *is* no trail
1453                                                 continue;
1454                                         }
1455                                 } else { #it's not an image, so output it raw
1456                                         $s .= $prefix . '[[' . $link . '|' . $text;
1457                                         # note: no $trail, because without an end, there *is* no trail
1458                                         continue;
1459                                 }
1460                         }
1461
1462                         $wasblank = ( '' == $text );
1463                         if( $wasblank ) $text = $link;
1464
1465
1466                         # Link not escaped by : , create the various objects
1467                         if( $noforce ) {
1468
1469                                 # Interwikis
1470                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1471                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1472                                         $s = rtrim($s . "\n");
1473                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1474                                         continue;
1475                                 }
1476
1477                                 if ( $ns == NS_IMAGE ) {
1478                                         wfProfileIn( "$fname-image" );
1479                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1480                                                 # recursively parse links inside the image caption
1481                                                 # actually, this will parse them in any other parameters, too,
1482                                                 # but it might be hard to fix that, and it doesn't matter ATM
1483                                                 $text = $this->replaceExternalLinks($text);
1484                                                 $text = $this->replaceInternalLinks($text);
1485
1486                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1487                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1488                                                 $this->mOutput->addImage( $nt->getDBkey() );
1489
1490                                                 wfProfileOut( "$fname-image" );
1491                                                 continue;
1492                                         }
1493                                         wfProfileOut( "$fname-image" );
1494
1495                                 }
1496
1497                                 if ( $ns == NS_CATEGORY ) {
1498                                         wfProfileIn( "$fname-category" );
1499                                         $s = rtrim($s . "\n"); # bug 87
1500
1501                                         if ( $wasblank ) {
1502                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1503                                                         $sortkey = $this->mTitle->getText();
1504                                                 } else {
1505                                                         $sortkey = $this->mTitle->getPrefixedText();
1506                                                 }
1507                                         } else {
1508                                                 $sortkey = $text;
1509                                         }
1510                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1511                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1512                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1513
1514                                         /**
1515                                          * Strip the whitespace Category links produce, see bug 87
1516                                          * @todo We might want to use trim($tmp, "\n") here.
1517                                          */
1518                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1519
1520                                         wfProfileOut( "$fname-category" );
1521                                         continue;
1522                                 }
1523                         }
1524
1525                         if( ( $nt->getPrefixedText() === $selflink ) &&
1526                             ( $nt->getFragment() === '' ) ) {
1527                                 # Self-links are handled specially; generally de-link and change to bold.
1528                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1529                                 continue;
1530                         }
1531
1532                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1533                         if( $ns == NS_MEDIA ) {
1534                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1535                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1536                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1537                                 $this->mOutput->addImage( $nt->getDBkey() );
1538                                 continue;
1539                         } elseif( $ns == NS_SPECIAL ) {
1540                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1541                                 continue;
1542                         } elseif( $ns == NS_IMAGE ) {
1543                                 $img = Image::newFromTitle( $nt );
1544                                 if( $img->exists() ) {
1545                                         // Force a blue link if the file exists; may be a remote
1546                                         // upload on the shared repository, and we want to see its
1547                                         // auto-generated page.
1548                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1549                                         continue;
1550                                 }
1551                         }
1552                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1553                 }
1554                 wfProfileOut( $fname );
1555                 return $s;
1556         }
1557
1558         /**
1559          * Make a link placeholder. The text returned can be later resolved to a real link with
1560          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1561          * parsing of interwiki links, and secondly to allow all extistence checks and
1562          * article length checks (for stub links) to be bundled into a single query.
1563          *
1564          */
1565         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1566                 if ( ! is_object($nt) ) {
1567                         # Fail gracefully
1568                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1569                 } else {
1570                         # Separate the link trail from the rest of the link
1571                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1572
1573                         if ( $nt->isExternal() ) {
1574                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1575                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1576                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1577                         } else {
1578                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1579                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1580                                 $this->mLinkHolders['queries'][] = $query;
1581                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1582                                 $this->mLinkHolders['titles'][] = $nt;
1583
1584                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1585                         }
1586                 }
1587                 return $retVal;
1588         }
1589
1590         /**
1591          * Render a forced-blue link inline; protect against double expansion of
1592          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1593          * Since this little disaster has to split off the trail text to avoid
1594          * breaking URLs in the following text without breaking trails on the
1595          * wiki links, it's been made into a horrible function.
1596          *
1597          * @param Title $nt
1598          * @param string $text
1599          * @param string $query
1600          * @param string $trail
1601          * @param string $prefix
1602          * @return string HTML-wikitext mix oh yuck
1603          */
1604         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1605                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1606                 $sk =& $this->mOptions->getSkin();
1607                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1608                 return $this->armorLinks( $link ) . $trail;
1609         }
1610
1611         /**
1612          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1613          * going to go through further parsing steps before inline URL expansion.
1614          *
1615          * In particular this is important when using action=render, which causes
1616          * full URLs to be included.
1617          *
1618          * Oh man I hate our multi-layer parser!
1619          *
1620          * @param string more-or-less HTML
1621          * @return string less-or-more HTML with NOPARSE bits
1622          */
1623         function armorLinks( $text ) {
1624                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1625                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1626         }
1627
1628         /**
1629          * Return true if subpage links should be expanded on this page.
1630          * @return bool
1631          */
1632         function areSubpagesAllowed() {
1633                 # Some namespaces don't allow subpages
1634                 global $wgNamespacesWithSubpages;
1635                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1636         }
1637
1638         /**
1639          * Handle link to subpage if necessary
1640          * @param string $target the source of the link
1641          * @param string &$text the link text, modified as necessary
1642          * @return string the full name of the link
1643          * @access private
1644          */
1645         function maybeDoSubpageLink($target, &$text) {
1646                 # Valid link forms:
1647                 # Foobar -- normal
1648                 # :Foobar -- override special treatment of prefix (images, language links)
1649                 # /Foobar -- convert to CurrentPage/Foobar
1650                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1651                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1652                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1653
1654                 $fname = 'Parser::maybeDoSubpageLink';
1655                 wfProfileIn( $fname );
1656                 $ret = $target; # default return value is no change
1657
1658                 # Some namespaces don't allow subpages,
1659                 # so only perform processing if subpages are allowed
1660                 if( $this->areSubpagesAllowed() ) {
1661                         # Look at the first character
1662                         if( $target != '' && $target{0} == '/' ) {
1663                                 # / at end means we don't want the slash to be shown
1664                                 if( substr( $target, -1, 1 ) == '/' ) {
1665                                         $target = substr( $target, 1, -1 );
1666                                         $noslash = $target;
1667                                 } else {
1668                                         $noslash = substr( $target, 1 );
1669                                 }
1670
1671                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1672                                 if( '' === $text ) {
1673                                         $text = $target;
1674                                 } # this might be changed for ugliness reasons
1675                         } else {
1676                                 # check for .. subpage backlinks
1677                                 $dotdotcount = 0;
1678                                 $nodotdot = $target;
1679                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1680                                         ++$dotdotcount;
1681                                         $nodotdot = substr( $nodotdot, 3 );
1682                                 }
1683                                 if($dotdotcount > 0) {
1684                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1685                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1686                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1687                                                 # / at the end means don't show full path
1688                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1689                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1690                                                         if( '' === $text ) {
1691                                                                 $text = $nodotdot;
1692                                                         }
1693                                                 }
1694                                                 $nodotdot = trim( $nodotdot );
1695                                                 if( $nodotdot != '' ) {
1696                                                         $ret .= '/' . $nodotdot;
1697                                                 }
1698                                         }
1699                                 }
1700                         }
1701                 }
1702
1703                 wfProfileOut( $fname );
1704                 return $ret;
1705         }
1706
1707         /**#@+
1708          * Used by doBlockLevels()
1709          * @access private
1710          */
1711         /* private */ function closeParagraph() {
1712                 $result = '';
1713                 if ( '' != $this->mLastSection ) {
1714                         $result = '</' . $this->mLastSection  . ">\n";
1715                 }
1716                 $this->mInPre = false;
1717                 $this->mLastSection = '';
1718                 return $result;
1719         }
1720         # getCommon() returns the length of the longest common substring
1721         # of both arguments, starting at the beginning of both.
1722         #
1723         /* private */ function getCommon( $st1, $st2 ) {
1724                 $fl = strlen( $st1 );
1725                 $shorter = strlen( $st2 );
1726                 if ( $fl < $shorter ) { $shorter = $fl; }
1727
1728                 for ( $i = 0; $i < $shorter; ++$i ) {
1729                         if ( $st1{$i} != $st2{$i} ) { break; }
1730                 }
1731                 return $i;
1732         }
1733         # These next three functions open, continue, and close the list
1734         # element appropriate to the prefix character passed into them.
1735         #
1736         /* private */ function openList( $char ) {
1737                 $result = $this->closeParagraph();
1738
1739                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1740                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1741                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1742                 else if ( ';' == $char ) {
1743                         $result .= '<dl><dt>';
1744                         $this->mDTopen = true;
1745                 }
1746                 else { $result = '<!-- ERR 1 -->'; }
1747
1748                 return $result;
1749         }
1750
1751         /* private */ function nextItem( $char ) {
1752                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1753                 else if ( ':' == $char || ';' == $char ) {
1754                         $close = '</dd>';
1755                         if ( $this->mDTopen ) { $close = '</dt>'; }
1756                         if ( ';' == $char ) {
1757                                 $this->mDTopen = true;
1758                                 return $close . '<dt>';
1759                         } else {
1760                                 $this->mDTopen = false;
1761                                 return $close . '<dd>';
1762                         }
1763                 }
1764                 return '<!-- ERR 2 -->';
1765         }
1766
1767         /* private */ function closeList( $char ) {
1768                 if ( '*' == $char ) { $text = '</li></ul>'; }
1769                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1770                 else if ( ':' == $char ) {
1771                         if ( $this->mDTopen ) {
1772                                 $this->mDTopen = false;
1773                                 $text = '</dt></dl>';
1774                         } else {
1775                                 $text = '</dd></dl>';
1776                         }
1777                 }
1778                 else {  return '<!-- ERR 3 -->'; }
1779                 return $text."\n";
1780         }
1781         /**#@-*/
1782
1783         /**
1784          * Make lists from lines starting with ':', '*', '#', etc.
1785          *
1786          * @access private
1787          * @return string the lists rendered as HTML
1788          */
1789         function doBlockLevels( $text, $linestart ) {
1790                 $fname = 'Parser::doBlockLevels';
1791                 wfProfileIn( $fname );
1792
1793                 # Parsing through the text line by line.  The main thing
1794                 # happening here is handling of block-level elements p, pre,
1795                 # and making lists from lines starting with * # : etc.
1796                 #
1797                 $textLines = explode( "\n", $text );
1798
1799                 $lastPrefix = $output = '';
1800                 $this->mDTopen = $inBlockElem = false;
1801                 $prefixLength = 0;
1802                 $paragraphStack = false;
1803
1804                 if ( !$linestart ) {
1805                         $output .= array_shift( $textLines );
1806                 }
1807                 foreach ( $textLines as $oLine ) {
1808                         $lastPrefixLength = strlen( $lastPrefix );
1809                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1810                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1811                         if ( !$this->mInPre ) {
1812                                 # Multiple prefixes may abut each other for nested lists.
1813                                 $prefixLength = strspn( $oLine, '*#:;' );
1814                                 $pref = substr( $oLine, 0, $prefixLength );
1815
1816                                 # eh?
1817                                 $pref2 = str_replace( ';', ':', $pref );
1818                                 $t = substr( $oLine, $prefixLength );
1819                                 $this->mInPre = !empty($preOpenMatch);
1820                         } else {
1821                                 # Don't interpret any other prefixes in preformatted text
1822                                 $prefixLength = 0;
1823                                 $pref = $pref2 = '';
1824                                 $t = $oLine;
1825                         }
1826
1827                         # List generation
1828                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1829                                 # Same as the last item, so no need to deal with nesting or opening stuff
1830                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1831                                 $paragraphStack = false;
1832
1833                                 if ( substr( $pref, -1 ) == ';') {
1834                                         # The one nasty exception: definition lists work like this:
1835                                         # ; title : definition text
1836                                         # So we check for : in the remainder text to split up the
1837                                         # title and definition, without b0rking links.
1838                                         $term = $t2 = '';
1839                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1840                                                 $t = $t2;
1841                                                 $output .= $term . $this->nextItem( ':' );
1842                                         }
1843                                 }
1844                         } elseif( $prefixLength || $lastPrefixLength ) {
1845                                 # Either open or close a level...
1846                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1847                                 $paragraphStack = false;
1848
1849                                 while( $commonPrefixLength < $lastPrefixLength ) {
1850                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1851                                         --$lastPrefixLength;
1852                                 }
1853                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1854                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1855                                 }
1856                                 while ( $prefixLength > $commonPrefixLength ) {
1857                                         $char = substr( $pref, $commonPrefixLength, 1 );
1858                                         $output .= $this->openList( $char );
1859
1860                                         if ( ';' == $char ) {
1861                                                 # FIXME: This is dupe of code above
1862                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1863                                                         $t = $t2;
1864                                                         $output .= $term . $this->nextItem( ':' );
1865                                                 }
1866                                         }
1867                                         ++$commonPrefixLength;
1868                                 }
1869                                 $lastPrefix = $pref2;
1870                         }
1871                         if( 0 == $prefixLength ) {
1872                                 wfProfileIn( "$fname-paragraph" );
1873                                 # No prefix (not in list)--go to paragraph mode
1874                                 // XXX: use a stack for nestable elements like span, table and div
1875                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1876                                 $closematch = preg_match(
1877                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1878                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1879                                 if ( $openmatch or $closematch ) {
1880                                         $paragraphStack = false;
1881                                         $output .= $this->closeParagraph();
1882                                         if ( $preOpenMatch and !$preCloseMatch ) {
1883                                                 $this->mInPre = true;
1884                                         }
1885                                         if ( $closematch ) {
1886                                                 $inBlockElem = false;
1887                                         } else {
1888                                                 $inBlockElem = true;
1889                                         }
1890                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1891                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1892                                                 // pre
1893                                                 if ($this->mLastSection != 'pre') {
1894                                                         $paragraphStack = false;
1895                                                         $output .= $this->closeParagraph().'<pre>';
1896                                                         $this->mLastSection = 'pre';
1897                                                 }
1898                                                 $t = substr( $t, 1 );
1899                                         } else {
1900                                                 // paragraph
1901                                                 if ( '' == trim($t) ) {
1902                                                         if ( $paragraphStack ) {
1903                                                                 $output .= $paragraphStack.'<br />';
1904                                                                 $paragraphStack = false;
1905                                                                 $this->mLastSection = 'p';
1906                                                         } else {
1907                                                                 if ($this->mLastSection != 'p' ) {
1908                                                                         $output .= $this->closeParagraph();
1909                                                                         $this->mLastSection = '';
1910                                                                         $paragraphStack = '<p>';
1911                                                                 } else {
1912                                                                         $paragraphStack = '</p><p>';
1913                                                                 }
1914                                                         }
1915                                                 } else {
1916                                                         if ( $paragraphStack ) {
1917                                                                 $output .= $paragraphStack;
1918                                                                 $paragraphStack = false;
1919                                                                 $this->mLastSection = 'p';
1920                                                         } else if ($this->mLastSection != 'p') {
1921                                                                 $output .= $this->closeParagraph().'<p>';
1922                                                                 $this->mLastSection = 'p';
1923                                                         }
1924                                                 }
1925                                         }
1926                                 }
1927                                 wfProfileOut( "$fname-paragraph" );
1928                         }
1929                         // somewhere above we forget to get out of pre block (bug 785)
1930                         if($preCloseMatch && $this->mInPre) {
1931                                 $this->mInPre = false;
1932                         }
1933                         if ($paragraphStack === false) {
1934                                 $output .= $t."\n";
1935                         }
1936                 }
1937                 while ( $prefixLength ) {
1938                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1939                         --$prefixLength;
1940                 }
1941                 if ( '' != $this->mLastSection ) {
1942                         $output .= '</' . $this->mLastSection . '>';
1943                         $this->mLastSection = '';
1944                 }
1945
1946                 wfProfileOut( $fname );
1947                 return $output;
1948         }
1949
1950         /**
1951          * Split up a string on ':', ignoring any occurences inside
1952          * <a>..</a> or <span>...</span>
1953          * @param string $str the string to split
1954          * @param string &$before set to everything before the ':'
1955          * @param string &$after set to everything after the ':'
1956          * return string the position of the ':', or false if none found
1957          */
1958         function findColonNoLinks($str, &$before, &$after) {
1959                 # I wonder if we should make this count all tags, not just <a>
1960                 # and <span>. That would prevent us from matching a ':' that
1961                 # comes in the middle of italics other such formatting....
1962                 # -- Wil
1963                 $fname = 'Parser::findColonNoLinks';
1964                 wfProfileIn( $fname );
1965                 $pos = 0;
1966                 do {
1967                         $colon = strpos($str, ':', $pos);
1968
1969                         if ($colon !== false) {
1970                                 $before = substr($str, 0, $colon);
1971                                 $after = substr($str, $colon + 1);
1972
1973                                 # Skip any ':' within <a> or <span> pairs
1974                                 $a = substr_count($before, '<a');
1975                                 $s = substr_count($before, '<span');
1976                                 $ca = substr_count($before, '</a>');
1977                                 $cs = substr_count($before, '</span>');
1978
1979                                 if ($a <= $ca and $s <= $cs) {
1980                                         # Tags are balanced before ':'; ok
1981                                         break;
1982                                 }
1983                                 $pos = $colon + 1;
1984                         }
1985                 } while ($colon !== false);
1986                 wfProfileOut( $fname );
1987                 return $colon;
1988         }
1989
1990         /**
1991          * Return value of a magic variable (like PAGENAME)
1992          *
1993          * @access private
1994          */
1995         function getVariableValue( $index ) {
1996                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
1997
1998                 /**
1999                  * Some of these require message or data lookups and can be
2000                  * expensive to check many times.
2001                  */
2002                 static $varCache = array();
2003                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2004                         if ( isset( $varCache[$index] ) )
2005                                 return $varCache[$index];
2006
2007                 $ts = time();
2008                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2009
2010                 switch ( $index ) {
2011                         case MAG_CURRENTMONTH:
2012                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2013                         case MAG_CURRENTMONTHNAME:
2014                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2015                         case MAG_CURRENTMONTHNAMEGEN:
2016                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2017                         case MAG_CURRENTMONTHABBREV:
2018                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2019                         case MAG_CURRENTDAY:
2020                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2021                         case MAG_CURRENTDAY2:
2022                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2023                         case MAG_PAGENAME:
2024                                 return $this->mTitle->getText();
2025                         case MAG_PAGENAMEE:
2026                                 return $this->mTitle->getPartialURL();
2027                         case MAG_FULLPAGENAME:
2028                                 return $this->mTitle->getPrefixedText();
2029                         case MAG_FULLPAGENAMEE:
2030                                 return $this->mTitle->getPrefixedURL();
2031                         case MAG_REVISIONID:
2032                                 return $this->mRevisionId;
2033                         case MAG_NAMESPACE:
2034                                 return $wgContLang->getNsText( $this->mTitle->getNamespace() );
2035                         case MAG_NAMESPACEE:
2036                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2037                         case MAG_CURRENTDAYNAME:
2038                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2039                         case MAG_CURRENTYEAR:
2040                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2041                         case MAG_CURRENTTIME:
2042                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2043                         case MAG_CURRENTWEEK:
2044                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2045                                 // int to remove the padding
2046                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2047                         case MAG_CURRENTDOW:
2048                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2049                         case MAG_NUMBEROFARTICLES:
2050                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2051                         case MAG_NUMBEROFFILES:
2052                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2053                         case MAG_SITENAME:
2054                                 return $wgSitename;
2055                         case MAG_SERVER:
2056                                 return $wgServer;
2057                         case MAG_SERVERNAME:
2058                                 return $wgServerName;
2059                         case MAG_SCRIPTPATH:
2060                                 return $wgScriptPath;
2061                         default:
2062                                 $ret = null;
2063                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2064                                         return $ret;
2065                                 else
2066                                         return null;
2067                 }
2068         }
2069
2070         /**
2071          * initialise the magic variables (like CURRENTMONTHNAME)
2072          *
2073          * @access private
2074          */
2075         function initialiseVariables() {
2076                 $fname = 'Parser::initialiseVariables';
2077                 wfProfileIn( $fname );
2078                 global $wgVariableIDs;
2079                 $this->mVariables = array();
2080                 foreach ( $wgVariableIDs as $id ) {
2081                         $mw =& MagicWord::get( $id );
2082                         $mw->addToArray( $this->mVariables, $id );
2083                 }
2084                 wfProfileOut( $fname );
2085         }
2086
2087         /**
2088          * parse any parentheses in format ((title|part|part))
2089          * and call callbacks to get a replacement text for any found piece
2090          *
2091          * @param string $text The text to parse
2092          * @param array $callbacks rules in form:
2093          *     '{' => array(                            # opening parentheses
2094          *                                      'end' => '}',   # closing parentheses
2095          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2096          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2097          *                                                                )
2098          *                                      )
2099          * @access private
2100          */
2101         function replace_callback ($text, $callbacks) {
2102                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2103                 $lastOpeningBrace = -1;                 # last not closed parentheses
2104
2105                 for ($i = 0; $i < strlen($text); $i++) {
2106                         # check for any opening brace
2107                         $rule = null;
2108                         $nextPos = -1;
2109                         foreach ($callbacks as $key => $value) {
2110                                 $pos = strpos ($text, $key, $i);
2111                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2112                                         $rule = $value;
2113                                         $nextPos = $pos;
2114                                 }
2115                         }
2116
2117                         if ($lastOpeningBrace >= 0) {
2118                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2119
2120                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2121                                         $rule = null;
2122                                         $nextPos = $pos;
2123                                 }
2124
2125                                 $pos = strpos ($text, '|', $i);
2126
2127                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2128                                         $rule = null;
2129                                         $nextPos = $pos;
2130                                 }
2131                         }
2132
2133                         if ($nextPos == -1)
2134                                 break;
2135
2136                         $i = $nextPos;
2137
2138                         # found openning brace, lets add it to parentheses stack
2139                         if (null != $rule) {
2140                                 $piece = array('brace' => $text[$i],
2141                                                            'braceEnd' => $rule['end'],
2142                                                            'count' => 1,
2143                                                            'title' => '',
2144                                                            'parts' => null);
2145
2146                                 # count openning brace characters
2147                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2148                                         $piece['count']++;
2149                                         $i++;
2150                                 }
2151
2152                                 $piece['startAt'] = $i+1;
2153                                 $piece['partStart'] = $i+1;
2154
2155                                 # we need to add to stack only if openning brace count is enough for any given rule
2156                                 foreach ($rule['cb'] as $cnt => $fn) {
2157                                         if ($piece['count'] >= $cnt) {
2158                                                 $lastOpeningBrace ++;
2159                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2160                                                 break;
2161                                         }
2162                                 }
2163
2164                                 continue;
2165                         }
2166                         else if ($lastOpeningBrace >= 0) {
2167                                 # first check if it is a closing brace
2168                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2169                                         # lets check if it is enough characters for closing brace
2170                                         $count = 1;
2171                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2172                                                 $count++;
2173
2174                                         # if there are more closing parentheses than opening ones, we parse less
2175                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2176                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2177
2178                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2179                                         $matchingCount = 0;
2180                                         $matchingCallback = null;
2181                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2182                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2183                                                         $matchingCount = $cnt;
2184                                                         $matchingCallback = $fn;
2185                                                 }
2186                                         }
2187
2188                                         if ($matchingCount == 0) {
2189                                                 $i += $count - 1;
2190                                                 continue;
2191                                         }
2192
2193                                         # lets set a title or last part (if '|' was found)
2194                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2195                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2196                                         else
2197                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2198
2199                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2200                                         $pieceEnd = $i + $matchingCount;
2201
2202                                         if( is_callable( $matchingCallback ) ) {
2203                                                 $cbArgs = array (
2204                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2205                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2206                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2207                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2208                                                                                  );
2209                                                 # finally we can call a user callback and replace piece of text
2210                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2211                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2212                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2213                                         }
2214                                         else {
2215                                                 # null value for callback means that parentheses should be parsed, but not replaced
2216                                                 $i += $matchingCount - 1;
2217                                         }
2218
2219                                         # reset last openning parentheses, but keep it in case there are unused characters
2220                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2221                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2222                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2223                                                                    'title' => '',
2224                                                                    'parts' => null,
2225                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2226                                         $openingBraceStack[$lastOpeningBrace--] = null;
2227
2228                                         if ($matchingCount < $piece['count']) {
2229                                                 $piece['count'] -= $matchingCount;
2230                                                 $piece['startAt'] -= $matchingCount;
2231                                                 $piece['partStart'] = $piece['startAt'];
2232                                                 # do we still qualify for any callback with remaining count?
2233                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2234                                                         if ($piece['count'] >= $cnt) {
2235                                                                 $lastOpeningBrace ++;
2236                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2237                                                                 break;
2238                                                         }
2239                                                 }
2240                                         }
2241                                         continue;
2242                                 }
2243
2244                                 # lets set a title if it is a first separator, or next part otherwise
2245                                 if ($text[$i] == '|') {
2246                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2247                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2248                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2249                                         }
2250                                         else
2251                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2252
2253                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2254                                 }
2255                         }
2256                 }
2257
2258                 return $text;
2259         }
2260
2261         /**
2262          * Replace magic variables, templates, and template arguments
2263          * with the appropriate text. Templates are substituted recursively,
2264          * taking care to avoid infinite loops.
2265          *
2266          * Note that the substitution depends on value of $mOutputType:
2267          *  OT_WIKI: only {{subst:}} templates
2268          *  OT_MSG: only magic variables
2269          *  OT_HTML: all templates and magic variables
2270          *
2271          * @param string $tex The text to transform
2272          * @param array $args Key-value pairs representing template parameters to substitute
2273          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2274          * @access private
2275          */
2276         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2277                 # Prevent too big inclusions
2278                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2279                         return $text;
2280                 }
2281
2282                 $fname = 'Parser::replaceVariables';
2283                 wfProfileIn( $fname );
2284
2285                 # This function is called recursively. To keep track of arguments we need a stack:
2286                 array_push( $this->mArgStack, $args );
2287
2288                 $braceCallbacks = array();
2289                 if ( !$argsOnly ) {
2290                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2291                 }
2292                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2293                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2294                 }
2295                 $callbacks = array();
2296                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2297                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2298                 $text = $this->replace_callback ($text, $callbacks);
2299
2300                 array_pop( $this->mArgStack );
2301
2302                 wfProfileOut( $fname );
2303                 return $text;
2304         }
2305
2306         /**
2307          * Replace magic variables
2308          * @access private
2309          */
2310         function variableSubstitution( $matches ) {
2311                 $fname = 'Parser::variableSubstitution';
2312                 $varname = $matches[1];
2313                 wfProfileIn( $fname );
2314                 if ( !$this->mVariables ) {
2315                         $this->initialiseVariables();
2316                 }
2317                 $skip = false;
2318                 if ( $this->mOutputType == OT_WIKI ) {
2319                         # Do only magic variables prefixed by SUBST
2320                         $mwSubst =& MagicWord::get( MAG_SUBST );
2321                         if (!$mwSubst->matchStartAndRemove( $varname ))
2322                                 $skip = true;
2323                         # Note that if we don't substitute the variable below,
2324                         # we don't remove the {{subst:}} magic word, in case
2325                         # it is a template rather than a magic variable.
2326                 }
2327                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2328                         $id = $this->mVariables[$varname];
2329                         $text = $this->getVariableValue( $id );
2330                         $this->mOutput->mContainsOldMagic = true;
2331                 } else {
2332                         $text = $matches[0];
2333                 }
2334                 wfProfileOut( $fname );
2335                 return $text;
2336         }
2337
2338         # Split template arguments
2339         function getTemplateArgs( $argsString ) {
2340                 if ( $argsString === '' ) {
2341                         return array();
2342                 }
2343
2344                 $args = explode( '|', substr( $argsString, 1 ) );
2345
2346                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2347                 # merged with the next arg because the '|' character between belongs
2348                 # to the link syntax and not the template parameter syntax.
2349                 $argc = count($args);
2350
2351                 for ( $i = 0; $i < $argc-1; $i++ ) {
2352                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2353                                 $args[$i] .= '|'.$args[$i+1];
2354                                 array_splice($args, $i+1, 1);
2355                                 $i--;
2356                                 $argc--;
2357                         }
2358                 }
2359
2360                 return $args;
2361         }
2362
2363         /**
2364          * Return the text of a template, after recursively
2365          * replacing any variables or templates within the template.
2366          *
2367          * @param array $piece The parts of the template
2368          *  $piece['text']: matched text
2369          *  $piece['title']: the title, i.e. the part before the |
2370          *  $piece['parts']: the parameter array
2371          * @return string the text of the template
2372          * @access private
2373          */
2374         function braceSubstitution( $piece ) {
2375                 global $wgContLang;
2376                 $fname = 'Parser::braceSubstitution';
2377                 wfProfileIn( $fname );
2378
2379                 # Flags
2380                 $found = false;             # $text has been filled
2381                 $nowiki = false;            # wiki markup in $text should be escaped
2382                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2383                 $noargs = false;            # Don't replace triple-brace arguments in $text
2384                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2385                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2386                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2387
2388                 # Title object, where $text came from
2389                 $title = NULL;
2390
2391                 $linestart = '';
2392
2393                 # $part1 is the bit before the first |, and must contain only title characters
2394                 # $args is a list of arguments, starting from index 0, not including $part1
2395
2396                 $part1 = $piece['title'];
2397                 # If the third subpattern matched anything, it will start with |
2398
2399                 if (null == $piece['parts']) {
2400                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2401                         if ($replaceWith != $piece['text']) {
2402                                 $text = $replaceWith;
2403                                 $found = true;
2404                                 $noparse = true;
2405                                 $noargs = true;
2406                         }
2407                 }
2408
2409                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2410                 $argc = count( $args );
2411
2412                 # SUBST
2413                 if ( !$found ) {
2414                         $mwSubst =& MagicWord::get( MAG_SUBST );
2415                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2416                                 # One of two possibilities is true:
2417                                 # 1) Found SUBST but not in the PST phase
2418                                 # 2) Didn't find SUBST and in the PST phase
2419                                 # In either case, return without further processing
2420                                 $text = $piece['text'];
2421                                 $found = true;
2422                                 $noparse = true;
2423                                 $noargs = true;
2424                         }
2425                 }
2426
2427                 # MSG, MSGNW, INT and RAW
2428                 if ( !$found ) {
2429                         # Check for MSGNW:
2430                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2431                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2432                                 $nowiki = true;
2433                         } else {
2434                                 # Remove obsolete MSG:
2435                                 $mwMsg =& MagicWord::get( MAG_MSG );
2436                                 $mwMsg->matchStartAndRemove( $part1 );
2437                         }
2438
2439                         # Check for RAW:
2440                         $mwRaw =& MagicWord::get( MAG_RAW );
2441                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2442                                 $forceRawInterwiki = true;
2443                         }
2444
2445                         # Check if it is an internal message
2446                         $mwInt =& MagicWord::get( MAG_INT );
2447                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2448                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2449                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2450                                         $found = true;
2451                                 }
2452                         }
2453                 }
2454
2455                 # NS
2456                 if ( !$found ) {
2457                         # Check for NS: (namespace expansion)
2458                         $mwNs = MagicWord::get( MAG_NS );
2459                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2460                                 if ( intval( $part1 ) || $part1 == "0" ) {
2461                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2462                                         $found = true;
2463                                 } else {
2464                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2465                                         if ( !is_null( $index ) ) {
2466                                                 $text = $linestart . $wgContLang->getNsText( $index );
2467                                                 $found = true;
2468                                         }
2469                                 }
2470                         }
2471                 }
2472
2473                 # LCFIRST, UCFIRST, LC and UC
2474                 if ( !$found ) {
2475                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2476                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2477                         $lc =& MagicWord::get( MAG_LC );
2478                         $uc =& MagicWord::get( MAG_UC );
2479                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2480                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2481                                 $found = true;
2482                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2483                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2484                                 $found = true;
2485                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2486                                 $text = $linestart . $wgContLang->lc( $part1 );
2487                                 $found = true;
2488                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2489                                  $text = $linestart . $wgContLang->uc( $part1 );
2490                                  $found = true;
2491                         }
2492                 }
2493
2494                 # LOCALURL and FULLURL
2495                 if ( !$found ) {
2496                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2497                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2498                         $mwFull =& MagicWord::get( MAG_FULLURL );
2499                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2500
2501
2502                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2503                                 $func = 'getLocalURL';
2504                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2505                                 $func = 'escapeLocalURL';
2506                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2507                                 $func = 'getFullURL';
2508                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2509                                 $func = 'escapeFullURL';
2510                         } else {
2511                                 $func = false;
2512                         }
2513
2514                         if ( $func !== false ) {
2515                                 $title = Title::newFromText( $part1 );
2516                                 if ( !is_null( $title ) ) {
2517                                         if ( $argc > 0 ) {
2518                                                 $text = $linestart . $title->$func( $args[0] );
2519                                         } else {
2520                                                 $text = $linestart . $title->$func();
2521                                         }
2522                                         $found = true;
2523                                 }
2524                         }
2525                 }
2526
2527                 # GRAMMAR
2528                 if ( !$found && $argc == 1 ) {
2529                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2530                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2531                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2532                                 $found = true;
2533                         }
2534                 }
2535
2536                 # PLURAL
2537                 if ( !$found && $argc >= 2 ) {
2538                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2539                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2540                                 if ($argc==2) {$args[2]=$args[1];}
2541                                 $text = $linestart . $wgContLang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2542                                 $found = true;
2543                         }
2544                 }
2545
2546                 # Template table test
2547
2548                 # Did we encounter this template already? If yes, it is in the cache
2549                 # and we need to check for loops.
2550                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2551                         $found = true;
2552
2553                         # Infinite loop test
2554                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2555                                 $noparse = true;
2556                                 $noargs = true;
2557                                 $found = true;
2558                                 $text = $linestart .
2559                                         '{{' . $part1 . '}}' .
2560                                         '<!-- WARNING: template loop detected -->';
2561                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2562                         } else {
2563                                 # set $text to cached message.
2564                                 $text = $linestart . $this->mTemplates[$piece['title']];
2565                         }
2566                 }
2567
2568                 # Load from database
2569                 $lastPathLevel = $this->mTemplatePath;
2570                 if ( !$found ) {
2571                         $ns = NS_TEMPLATE;
2572                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage='' );
2573                         if ($subpage !== '') {
2574                                 $ns = $this->mTitle->getNamespace();
2575                         }
2576                         $title = Title::newFromText( $part1, $ns );
2577
2578                         if ( !is_null( $title ) ) {
2579                                 if ( !$title->isExternal() ) {
2580                                         # Check for excessive inclusion
2581                                         $dbk = $title->getPrefixedDBkey();
2582                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2583                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() ) {
2584                                                         # Capture special page output
2585                                                         $text = SpecialPage::capturePath( $title );
2586                                                         if ( is_string( $text ) ) {
2587                                                                 $found = true;
2588                                                                 $noparse = true;
2589                                                                 $noargs = true;
2590                                                                 $isHTML = true;
2591                                                                 $this->disableCache();
2592                                                         }
2593                                                 } else {
2594                                                         $articleContent = $this->fetchTemplate( $title );
2595                                                         if ( $articleContent !== false ) {
2596                                                                 $found = true;
2597                                                                 $text = $articleContent;
2598                                                                 $replaceHeadings = true;
2599                                                         }
2600                                                 }
2601                                         }
2602
2603                                         # If the title is valid but undisplayable, make a link to it
2604                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2605                                                 $text = '[['.$title->getPrefixedText().']]';
2606                                                 $found = true;
2607                                         }
2608                                 } elseif ( $title->isTrans() ) {
2609                                         // Interwiki transclusion
2610                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2611                                                 $text = $this->interwikiTransclude( $title, 'render' );
2612                                                 $isHTML = true;
2613                                                 $noparse = true;
2614                                         } else {
2615                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2616                                                 $replaceHeadings = true;
2617                                         }
2618                                         $found = true;
2619                                 }
2620
2621                                 # Template cache array insertion
2622                                 # Use the original $piece['title'] not the mangled $part1, so that
2623                                 # modifiers such as RAW: produce separate cache entries
2624                                 if( $found ) {
2625                                         $this->mTemplates[$piece['title']] = $text;
2626                                         $text = $linestart . $text;
2627                                 }
2628                         }
2629                 }
2630
2631                 # Recursive parsing, escaping and link table handling
2632                 # Only for HTML output
2633                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2634                         $text = wfEscapeWikiText( $text );
2635                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2636                         if ( !$noargs ) {
2637                                 # Clean up argument array
2638                                 $assocArgs = array();
2639                                 $index = 1;
2640                                 foreach( $args as $arg ) {
2641                                         $eqpos = strpos( $arg, '=' );
2642                                         if ( $eqpos === false ) {
2643                                                 $assocArgs[$index++] = $arg;
2644                                         } else {
2645                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2646                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2647                                                 if ( $value === false ) {
2648                                                         $value = '';
2649                                                 }
2650                                                 if ( $name !== false ) {
2651                                                         $assocArgs[$name] = $value;
2652                                                 }
2653                                         }
2654                                 }
2655
2656                                 # Add a new element to the templace recursion path
2657                                 $this->mTemplatePath[$part1] = 1;
2658                         }
2659
2660                         if ( !$noparse ) {
2661                                 # If there are any <onlyinclude> tags, only include them
2662                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2663                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2664                                         $text = '';
2665                                         foreach ($m[1] as $piece)
2666                                                 $text .= $piece;
2667                                 }
2668                                 # Remove <noinclude> sections and <includeonly> tags
2669                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2670                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2671
2672                                 if( $this->mOutputType == OT_HTML ) {
2673                                         # Strip <nowiki>, <pre>, etc.
2674                                         $text = $this->strip( $text, $this->mStripState );
2675                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2676                                 }
2677                                 $text = $this->replaceVariables( $text, $assocArgs );
2678
2679                                 # If the template begins with a table or block-level
2680                                 # element, it should be treated as beginning a new line.
2681                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2682                                         $text = "\n" . $text;
2683                                 }
2684                         } elseif ( !$noargs ) {
2685                                 # $noparse and !$noargs
2686                                 # Just replace the arguments, not any double-brace items
2687                                 # This is used for rendered interwiki transclusion
2688                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2689                         }
2690                 }
2691                 # Prune lower levels off the recursion check path
2692                 $this->mTemplatePath = $lastPathLevel;
2693
2694                 if ( !$found ) {
2695                         wfProfileOut( $fname );
2696                         return $piece['text'];
2697                 } else {
2698                         if ( $isHTML ) {
2699                                 # Replace raw HTML by a placeholder
2700                                 # Add a blank line preceding, to prevent it from mucking up
2701                                 # immediately preceding headings
2702                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2703                         } else {
2704                                 # replace ==section headers==
2705                                 # XXX this needs to go away once we have a better parser.
2706                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2707                                         if( !is_null( $title ) )
2708                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2709                                         else
2710                                                 $encodedname = base64_encode("");
2711                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2712                                                 PREG_SPLIT_DELIM_CAPTURE);
2713                                         $text = '';
2714                                         $nsec = 0;
2715                                         for( $i = 0; $i < count($m); $i += 2 ) {
2716                                                 $text .= $m[$i];
2717                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2718                                                 $hl = $m[$i + 1];
2719                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2720                                                         $text .= $hl;
2721                                                         continue;
2722                                                 }
2723                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2724                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2725                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2726
2727                                                 $nsec++;
2728                                         }
2729                                 }
2730                         }
2731                 }
2732
2733                 # Prune lower levels off the recursion check path
2734                 $this->mTemplatePath = $lastPathLevel;
2735
2736                 if ( !$found ) {
2737                         wfProfileOut( $fname );
2738                         return $piece['text'];
2739                 } else {
2740                         wfProfileOut( $fname );
2741                         return $text;
2742                 }
2743         }
2744
2745         /**
2746          * Fetch the unparsed text of a template and register a reference to it.
2747          */
2748         function fetchTemplate( $title ) {
2749                 $text = false;
2750                 // Loop to fetch the article, with up to 1 redirect
2751                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
2752                         $rev = Revision::newFromTitle( $title );
2753                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
2754                         if ( !$rev ) {
2755                                 break;
2756                         }
2757                         $text = $rev->getText();
2758                         if ( $text === false ) {
2759                                 break;
2760                         }
2761                         // Redirect?
2762                         $title = Title::newFromRedirect( $text );
2763                 }
2764                 return $text;
2765         }
2766
2767         /**
2768          * Transclude an interwiki link.
2769          */
2770         function interwikiTransclude( $title, $action ) {
2771                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
2772
2773                 if (!$wgEnableScaryTranscluding)
2774                         return wfMsg('scarytranscludedisabled');
2775
2776                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
2777                 // But we'll handle it generally anyway
2778                 if ( $title->getNamespace() ) {
2779                         // Use the canonical namespace, which should work anywhere
2780                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
2781                 } else {
2782                         $articleName = $title->getDBkey();
2783                 }
2784
2785                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
2786                 $url .= "?action=$action";
2787                 if (strlen($url) > 255)
2788                         return wfMsg('scarytranscludetoolong');
2789                 return $this->fetchScaryTemplateMaybeFromCache($url);
2790         }
2791
2792         function fetchScaryTemplateMaybeFromCache($url) {
2793                 global $wgTranscludeCacheExpiry;
2794                 $dbr =& wfGetDB(DB_SLAVE);
2795                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2796                                 array('tc_url' => $url));
2797                 if ($obj) {
2798                         $time = $obj->tc_time;
2799                         $text = $obj->tc_contents;
2800                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
2801                                 return $text;
2802                         }
2803                 }
2804
2805                 $text = wfGetHTTP($url);
2806                 if (!$text)
2807                         return wfMsg('scarytranscludefailed', $url);
2808
2809                 $dbw =& wfGetDB(DB_MASTER);
2810                 $dbw->replace('transcache', array('tc_url'), array(
2811                         'tc_url' => $url,
2812                         'tc_time' => time(),
2813                         'tc_contents' => $text));
2814                 return $text;
2815         }
2816
2817
2818         /**
2819          * Triple brace replacement -- used for template arguments
2820          * @access private
2821          */
2822         function argSubstitution( $matches ) {
2823                 $arg = trim( $matches['title'] );
2824                 $text = $matches['text'];
2825                 $inputArgs = end( $this->mArgStack );
2826
2827                 if ( array_key_exists( $arg, $inputArgs ) ) {
2828                         $text = $inputArgs[$arg];
2829                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
2830                         $text = $matches['parts'][0];
2831                 }
2832
2833                 return $text;
2834         }
2835
2836         /**
2837          * Returns true if the function is allowed to include this entity
2838          * @access private
2839          */
2840         function incrementIncludeCount( $dbk ) {
2841                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2842                         $this->mIncludeCount[$dbk] = 0;
2843                 }
2844                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2845                         return true;
2846                 } else {
2847                         return false;
2848                 }
2849         }
2850
2851         /**
2852          * This function accomplishes several tasks:
2853          * 1) Auto-number headings if that option is enabled
2854          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2855          * 3) Add a Table of contents on the top for users who have enabled the option
2856          * 4) Auto-anchor headings
2857          *
2858          * It loops through all headlines, collects the necessary data, then splits up the
2859          * string and re-inserts the newly formatted headlines.
2860          *
2861          * @param string $text
2862          * @param boolean $isMain
2863          * @access private
2864          */
2865         function formatHeadings( $text, $isMain=true ) {
2866                 global $wgMaxTocLevel, $wgContLang;
2867
2868                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2869                 $doShowToc = true;
2870                 $forceTocHere = false;
2871                 if( !$this->mTitle->userCanEdit() ) {
2872                         $showEditLink = 0;
2873                 } else {
2874                         $showEditLink = $this->mOptions->getEditSection();
2875                 }
2876
2877                 # Inhibit editsection links if requested in the page
2878                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2879                 if( $esw->matchAndRemove( $text ) ) {
2880                         $showEditLink = 0;
2881                 }
2882                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
2883                 # do not add TOC
2884                 $mw =& MagicWord::get( MAG_NOTOC );
2885                 if( $mw->matchAndRemove( $text ) ) {
2886                         $doShowToc = false;
2887                 }
2888
2889                 # Get all headlines for numbering them and adding funky stuff like [edit]
2890                 # links - this is for later, but we need the number of headlines right now
2891                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
2892
2893                 # if there are fewer than 4 headlines in the article, do not show TOC
2894                 if( $numMatches < 4 ) {
2895                         $doShowToc = false;
2896                 }
2897
2898                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
2899                 # override above conditions and always show TOC at that place
2900
2901                 $mw =& MagicWord::get( MAG_TOC );
2902                 if($mw->match( $text ) ) {
2903                         $doShowToc = true;
2904                         $forceTocHere = true;
2905                 } else {
2906                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
2907                         # override above conditions and always show TOC above first header
2908                         $mw =& MagicWord::get( MAG_FORCETOC );
2909                         if ($mw->matchAndRemove( $text ) ) {
2910                                 $doShowToc = true;
2911                         }
2912                 }
2913
2914                 # Never ever show TOC if no headers
2915                 if( $numMatches < 1 ) {
2916                         $doShowToc = false;
2917                 }
2918
2919                 # We need this to perform operations on the HTML
2920                 $sk =& $this->mOptions->getSkin();
2921
2922                 # headline counter
2923                 $headlineCount = 0;
2924                 $sectionCount = 0; # headlineCount excluding template sections
2925
2926                 # Ugh .. the TOC should have neat indentation levels which can be
2927                 # passed to the skin functions. These are determined here
2928                 $toc = '';
2929                 $full = '';
2930                 $head = array();
2931                 $sublevelCount = array();
2932                 $levelCount = array();
2933                 $toclevel = 0;
2934                 $level = 0;
2935                 $prevlevel = 0;
2936                 $toclevel = 0;
2937                 $prevtoclevel = 0;
2938
2939                 foreach( $matches[3] as $headline ) {
2940                         $istemplate = 0;
2941                         $templatetitle = '';
2942                         $templatesection = 0;
2943                         $numbering = '';
2944
2945                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
2946                                 $istemplate = 1;
2947                                 $templatetitle = base64_decode($mat[1]);
2948                                 $templatesection = 1 + (int)base64_decode($mat[2]);
2949                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
2950                         }
2951
2952                         if( $toclevel ) {
2953                                 $prevlevel = $level;
2954                                 $prevtoclevel = $toclevel;
2955                         }
2956                         $level = $matches[1][$headlineCount];
2957
2958                         if( $doNumberHeadings || $doShowToc ) {
2959
2960                                 if ( $level > $prevlevel ) {
2961                                         # Increase TOC level
2962                                         $toclevel++;
2963                                         $sublevelCount[$toclevel] = 0;
2964                                         $toc .= $sk->tocIndent();
2965                                 }
2966                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
2967                                         # Decrease TOC level, find level to jump to
2968
2969                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
2970                                                 # Can only go down to level 1
2971                                                 $toclevel = 1;
2972                                         } else {
2973                                                 for ($i = $toclevel; $i > 0; $i--) {
2974                                                         if ( $levelCount[$i] == $level ) {
2975                                                                 # Found last matching level
2976                                                                 $toclevel = $i;
2977                                                                 break;
2978                                                         }
2979                                                         elseif ( $levelCount[$i] < $level ) {
2980                                                                 # Found first matching level below current level
2981                                                                 $toclevel = $i + 1;
2982                                                                 break;
2983                                                         }
2984                                                 }
2985                                         }
2986
2987                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
2988                                 }
2989                                 else {
2990                                         # No change in level, end TOC line
2991                                         $toc .= $sk->tocLineEnd();
2992                                 }
2993
2994                                 $levelCount[$toclevel] = $level;
2995
2996                                 # count number of headlines for each level
2997                                 @$sublevelCount[$toclevel]++;
2998                                 $dot = 0;
2999                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3000                                         if( !empty( $sublevelCount[$i] ) ) {
3001                                                 if( $dot ) {
3002                                                         $numbering .= '.';
3003                                                 }
3004                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3005                                                 $dot = 1;
3006                                         }
3007                                 }
3008                         }
3009
3010                         # The canonized header is a version of the header text safe to use for links
3011                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3012                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3013                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3014
3015                         # Remove link placeholders by the link text.
3016                         #     <!--LINK number-->
3017                         # turns into
3018                         #     link text with suffix
3019                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3020                                                             "\$this->mLinkHolders['texts'][\$1]",
3021                                                             $canonized_headline );
3022                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3023                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3024                                                             $canonized_headline );
3025
3026                         # strip out HTML
3027                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3028                         $tocline = trim( $canonized_headline );
3029                         $canonized_headline = Sanitizer::escapeId( $tocline );
3030                         $refers[$headlineCount] = $canonized_headline;
3031
3032                         # count how many in assoc. array so we can track dupes in anchors
3033                         @$refers[$canonized_headline]++;
3034                         $refcount[$headlineCount]=$refers[$canonized_headline];
3035
3036                         # Don't number the heading if it is the only one (looks silly)
3037                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3038                                 # the two are different if the line contains a link
3039                                 $headline=$numbering . ' ' . $headline;
3040                         }
3041
3042                         # Create the anchor for linking from the TOC to the section
3043                         $anchor = $canonized_headline;
3044                         if($refcount[$headlineCount] > 1 ) {
3045                                 $anchor .= '_' . $refcount[$headlineCount];
3046                         }
3047                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3048                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3049                         }
3050                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3051                                 if ( empty( $head[$headlineCount] ) ) {
3052                                         $head[$headlineCount] = '';
3053                                 }
3054                                 if( $istemplate )
3055                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3056                                 else
3057                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1);
3058                         }
3059
3060                         # give headline the correct <h#> tag
3061                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3062
3063                         $headlineCount++;
3064                         if( !$istemplate )
3065                                 $sectionCount++;
3066                 }
3067
3068                 if( $doShowToc ) {
3069                         $toc .= $sk->tocUnindent( $toclevel - 1 );
3070                         $toc = $sk->tocList( $toc );
3071                 }
3072
3073                 # split up and insert constructed headlines
3074
3075                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3076                 $i = 0;
3077
3078                 foreach( $blocks as $block ) {
3079                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3080                                 # This is the [edit] link that appears for the top block of text when
3081                                 # section editing is enabled
3082
3083                                 # Disabled because it broke block formatting
3084                                 # For example, a bullet point in the top line
3085                                 # $full .= $sk->editSectionLink(0);
3086                         }
3087                         $full .= $block;
3088                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
3089                         # Top anchor now in skin
3090                                 $full = $full.$toc;
3091                         }
3092
3093                         if( !empty( $head[$i] ) ) {
3094                                 $full .= $head[$i];
3095                         }
3096                         $i++;
3097                 }
3098                 if($forceTocHere) {
3099                         $mw =& MagicWord::get( MAG_TOC );
3100                         return $mw->replace( $toc, $full );
3101                 } else {
3102                         return $full;
3103                 }
3104         }
3105
3106         /**
3107          * Return an HTML link for the "ISBN 123456" text
3108          * @access private
3109          */
3110         function magicISBN( $text ) {
3111                 $fname = 'Parser::magicISBN';
3112                 wfProfileIn( $fname );
3113
3114                 $a = split( 'ISBN ', ' '.$text );
3115                 if ( count ( $a ) < 2 ) {
3116                         wfProfileOut( $fname );
3117                         return $text;
3118                 }
3119                 $text = substr( array_shift( $a ), 1);
3120                 $valid = '0123456789-Xx';
3121
3122                 foreach ( $a as $x ) {
3123                         $isbn = $blank = '' ;
3124                         while ( ' ' == $x{0} ) {
3125                                 $blank .= ' ';
3126                                 $x = substr( $x, 1 );
3127                         }
3128                         if ( $x == '' ) { # blank isbn
3129                                 $text .= "ISBN $blank";
3130                                 continue;
3131                         }
3132                         while ( strstr( $valid, $x{0} ) != false ) {
3133                                 $isbn .= $x{0};
3134                                 $x = substr( $x, 1 );
3135                         }
3136                         $num = str_replace( '-', '', $isbn );
3137                         $num = str_replace( ' ', '', $num );
3138                         $num = str_replace( 'x', 'X', $num );
3139
3140                         if ( '' == $num ) {
3141                                 $text .= "ISBN $blank$x";
3142                         } else {
3143                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3144                                 $text .= '<a href="' .
3145                                 $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3146                                         "\" class=\"internal\">ISBN $isbn</a>";
3147                                 $text .= $x;
3148                         }
3149                 }
3150                 wfProfileOut( $fname );
3151                 return $text;
3152         }
3153
3154         /**
3155          * Return an HTML link for the "RFC 1234" text
3156          *
3157          * @access private
3158          * @param string $text     Text to be processed
3159          * @param string $keyword  Magic keyword to use (default RFC)
3160          * @param string $urlmsg   Interface message to use (default rfcurl)
3161          * @return string
3162          */
3163         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3164
3165                 $valid = '0123456789';
3166                 $internal = false;
3167
3168                 $a = split( $keyword, ' '.$text );
3169                 if ( count ( $a ) < 2 ) {
3170                         return $text;
3171                 }
3172                 $text = substr( array_shift( $a ), 1);
3173
3174                 /* Check if keyword is preceed by [[.
3175                  * This test is made here cause of the array_shift above
3176                  * that prevent the test to be done in the foreach.
3177                  */
3178                 if ( substr( $text, -2 ) == '[[' ) {
3179                         $internal = true;
3180                 }
3181
3182                 foreach ( $a as $x ) {
3183                         /* token might be empty if we have RFC RFC 1234 */
3184                         if ( $x=='' ) {
3185                                 $text.=$keyword;
3186                                 continue;
3187                                 }
3188
3189                         $id = $blank = '' ;
3190
3191                         /** remove and save whitespaces in $blank */
3192                         while ( $x{0} == ' ' ) {
3193                                 $blank .= ' ';
3194                                 $x = substr( $x, 1 );
3195                         }
3196
3197                         /** remove and save the rfc number in $id */
3198                         while ( strstr( $valid, $x{0} ) != false ) {
3199                                 $id .= $x{0};
3200                                 $x = substr( $x, 1 );
3201                         }
3202
3203                         if ( $id == '' ) {
3204                                 /* call back stripped spaces*/
3205                                 $text .= $keyword.$blank.$x;
3206                         } elseif( $internal ) {
3207                                 /* normal link */
3208                                 $text .= $keyword.$id.$x;
3209                         } else {
3210                                 /* build the external link*/
3211                                 $url = wfMsg( $urlmsg, $id);
3212                                 $sk =& $this->mOptions->getSkin();
3213                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3214                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3215                         }
3216
3217                         /* Check if the next RFC keyword is preceed by [[ */
3218                         $internal = ( substr($x,-2) == '[[' );
3219                 }
3220                 return $text;
3221         }
3222
3223         /**
3224          * Transform wiki markup when saving a page by doing \r\n -> \n
3225          * conversion, substitting signatures, {{subst:}} templates, etc.
3226          *
3227          * @param string $text the text to transform
3228          * @param Title &$title the Title object for the current article
3229          * @param User &$user the User object describing the current user
3230          * @param ParserOptions $options parsing options
3231          * @param bool $clearState whether to clear the parser state first
3232          * @return string the altered wiki markup
3233          * @access public
3234          */
3235         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3236                 $this->mOptions = $options;
3237                 $this->mTitle =& $title;
3238                 $this->mOutputType = OT_WIKI;
3239
3240                 if ( $clearState ) {
3241                         $this->clearState();
3242                 }
3243
3244                 $stripState = false;
3245                 $pairs = array(
3246                         "\r\n" => "\n",
3247                 );
3248                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3249                 $text = $this->strip( $text, $stripState, true );
3250                 $text = $this->pstPass2( $text, $user );
3251                 $text = $this->unstrip( $text, $stripState );
3252                 $text = $this->unstripNoWiki( $text, $stripState );
3253                 return $text;
3254         }
3255
3256         /**
3257          * Pre-save transform helper function
3258          * @access private
3259          */
3260         function pstPass2( $text, &$user ) {
3261                 global $wgContLang, $wgLocaltimezone;
3262
3263                 /* Note: This is the timestamp saved as hardcoded wikitext to
3264                  * the database, we use $wgContLang here in order to give
3265                  * everyone the same signiture and use the default one rather
3266                  * than the one selected in each users preferences.
3267                  */
3268                 if ( isset( $wgLocaltimezone ) ) {
3269                         $oldtz = getenv( 'TZ' );
3270                         putenv( 'TZ='.$wgLocaltimezone );
3271                 }
3272                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3273                   ' (' . date( 'T' ) . ')';
3274                 if ( isset( $wgLocaltimezone ) ) {
3275                         putenv( 'TZ='.$oldtz );
3276                 }
3277
3278                 # Variable replacement
3279                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3280                 $text = $this->replaceVariables( $text );
3281
3282                 # Signatures
3283                 $sigText = $this->getUserSig( $user );
3284                 $text = strtr( $text, array(
3285                         '~~~~~' => $d,
3286                         '~~~~' => "$sigText $d",
3287                         '~~~' => $sigText
3288                 ) );
3289
3290                 # Context links: [[|name]] and [[name (context)|]]
3291                 #
3292                 global $wgLegalTitleChars;
3293                 $tc = "[$wgLegalTitleChars]";
3294                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3295
3296                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3297                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3298
3299                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3300                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3301                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3302                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3303                 $context = '';
3304                 $t = $this->mTitle->getText();
3305                 if ( preg_match( $conpat, $t, $m ) ) {
3306                         $context = $m[2];
3307                 }
3308                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3309                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3310                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3311
3312                 if ( '' == $context ) {
3313                         $text = preg_replace( $p2, '[[\\1]]', $text );
3314                 } else {
3315                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3316                 }
3317
3318                 # Trim trailing whitespace
3319                 # MAG_END (__END__) tag allows for trailing
3320                 # whitespace to be deliberately included
3321                 $text = rtrim( $text );
3322                 $mw =& MagicWord::get( MAG_END );
3323                 $mw->matchAndRemove( $text );
3324
3325                 return $text;
3326         }
3327
3328         /**
3329          * Fetch the user's signature text, if any, and normalize to
3330          * validated, ready-to-insert wikitext.
3331          *
3332          * @param User $user
3333          * @return string
3334          * @access private
3335          */
3336         function getUserSig( &$user ) {
3337                 global $wgContLang;
3338
3339                 $username = $user->getName();
3340                 $nickname = $user->getOption( 'nickname' );
3341                 $nickname = $nickname === '' ? $username : $nickname;
3342
3343                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3344                         # Sig. might contain markup; validate this
3345                         if( $this->validateSig( $nickname ) !== false ) {
3346                                 # Validated; clean up (if needed) and return it
3347                                 return( $this->cleanSig( $nickname ) );
3348                         } else {
3349                                 # Failed to validate; fall back to the default
3350                                 $nickname = $username;
3351                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3352                         }
3353                 }
3354
3355                 # If we're still here, make it a link to the user page
3356                 $userpage = $user->getUserPage();
3357                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3358         }
3359
3360         /**
3361          * Check that the user's signature contains no bad XML
3362          *
3363          * @param string $text
3364          * @return mixed An expanded string, or false if invalid.
3365          */
3366         function validateSig( $text ) {
3367                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3368         }
3369
3370         /**
3371          * Clean up signature text
3372          *
3373          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3374          * 2) Substitute all transclusions
3375          *
3376          * @param string $text
3377          * @return string Signature text
3378          */
3379         function cleanSig( $text ) {
3380                 $substWord = MagicWord::get( MAG_SUBST );
3381                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3382                 $substText = '{{' . $substWord->getSynonym( 0 );
3383
3384                 $text = preg_replace( $substRegex, $substText, $text );
3385                 $text = preg_replace( '/~{3,5}/', '', $text );
3386                 $text = $this->replaceVariables( $text );
3387
3388                 return $text;
3389         }
3390
3391         /**
3392          * Set up some variables which are usually set up in parse()
3393          * so that an external function can call some class members with confidence
3394          * @access public
3395          */
3396         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3397                 $this->mTitle =& $title;
3398                 $this->mOptions = $options;
3399                 $this->mOutputType = $outputType;
3400                 if ( $clearState ) {
3401                         $this->clearState();
3402                 }
3403         }
3404
3405         /**
3406          * Transform a MediaWiki message by replacing magic variables.
3407          *
3408          * @param string $text the text to transform
3409          * @param ParserOptions $options  options
3410          * @return string the text with variables substituted
3411          * @access public
3412          */
3413         function transformMsg( $text, $options ) {
3414                 global $wgTitle;
3415                 static $executing = false;
3416
3417                 $fname = "Parser::transformMsg";
3418
3419                 # Guard against infinite recursion
3420                 if ( $executing ) {
3421                         return $text;
3422                 }
3423                 $executing = true;
3424
3425                 wfProfileIn($fname);
3426
3427                 $this->mTitle = $wgTitle;
3428                 $this->mOptions = $options;
3429                 $this->mOutputType = OT_MSG;
3430                 $this->clearState();
3431                 $text = $this->replaceVariables( $text );
3432
3433                 $executing = false;
3434                 wfProfileOut($fname);
3435                 return $text;
3436         }
3437
3438         /**
3439          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3440          * The callback should have the following form:
3441          *    function myParserHook( $text, $params, &$parser ) { ... }
3442          *
3443          * Transform and return $text. Use $parser for any required context, e.g. use
3444          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3445          *
3446          * @access public
3447          *
3448          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3449          * @param mixed $callback The callback function (and object) to use for the tag
3450          *
3451          * @return The old value of the mTagHooks array associated with the hook
3452          */
3453         function setHook( $tag, $callback ) {
3454                 $oldVal = @$this->mTagHooks[$tag];
3455                 $this->mTagHooks[$tag] = $callback;
3456
3457                 return $oldVal;
3458         }
3459
3460         /**
3461          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3462          * Placeholders created in Skin::makeLinkObj()
3463          * Returns an array of links found, indexed by PDBK:
3464          *  0 - broken
3465          *  1 - normal link
3466          *  2 - stub
3467          * $options is a bit field, RLH_FOR_UPDATE to select for update
3468          */
3469         function replaceLinkHolders( &$text, $options = 0 ) {
3470                 global $wgUser;
3471                 global $wgOutputReplace;
3472
3473                 $fname = 'Parser::replaceLinkHolders';
3474                 wfProfileIn( $fname );
3475
3476                 $pdbks = array();
3477                 $colours = array();
3478                 $sk =& $this->mOptions->getSkin();
3479                 $linkCache =& LinkCache::singleton();
3480
3481                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3482                         wfProfileIn( $fname.'-check' );
3483                         $dbr =& wfGetDB( DB_SLAVE );
3484                         $page = $dbr->tableName( 'page' );
3485                         $threshold = $wgUser->getOption('stubthreshold');
3486
3487                         # Sort by namespace
3488                         asort( $this->mLinkHolders['namespaces'] );
3489
3490                         # Generate query
3491                         $query = false;
3492                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3493                                 # Make title object
3494                                 $title = $this->mLinkHolders['titles'][$key];
3495
3496                                 # Skip invalid entries.
3497                                 # Result will be ugly, but prevents crash.
3498                                 if ( is_null( $title ) ) {
3499                                         continue;
3500                                 }
3501                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3502
3503                                 # Check if it's a static known link, e.g. interwiki
3504                                 if ( $title->isAlwaysKnown() ) {
3505                                         $colours[$pdbk] = 1;
3506                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3507                                         $colours[$pdbk] = 1;
3508                                         $this->mOutput->addLink( $title, $id );
3509                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3510                                         $colours[$pdbk] = 0;
3511                                 } else {
3512                                         # Not in the link cache, add it to the query
3513                                         if ( !isset( $current ) ) {
3514                                                 $current = $ns;
3515                                                 $query =  "SELECT page_id, page_namespace, page_title";
3516                                                 if ( $threshold > 0 ) {
3517                                                         $query .= ', page_len, page_is_redirect';
3518                                                 }
3519                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3520                                         } elseif ( $current != $ns ) {
3521                                                 $current = $ns;
3522                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3523                                         } else {
3524                                                 $query .= ', ';
3525                                         }
3526
3527                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3528                                 }
3529                         }
3530                         if ( $query ) {
3531                                 $query .= '))';
3532                                 if ( $options & RLH_FOR_UPDATE ) {
3533                                         $query .= ' FOR UPDATE';
3534                                 }
3535
3536                                 $res = $dbr->query( $query, $fname );
3537
3538                                 # Fetch data and form into an associative array
3539                                 # non-existent = broken
3540                                 # 1 = known
3541                                 # 2 = stub
3542                                 while ( $s = $dbr->fetchObject($res) ) {
3543                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3544                                         $pdbk = $title->getPrefixedDBkey();
3545                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3546                                         $this->mOutput->addLink( $title, $s->page_id );
3547
3548                                         if ( $threshold >  0 ) {
3549                                                 $size = $s->page_len;
3550                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3551                                                         $colours[$pdbk] = 1;
3552                                                 } else {
3553                                                         $colours[$pdbk] = 2;
3554                                                 }
3555                                         } else {
3556                                                 $colours[$pdbk] = 1;
3557                                         }
3558                                 }
3559                         }
3560                         wfProfileOut( $fname.'-check' );
3561
3562                         # Construct search and replace arrays
3563                         wfProfileIn( $fname.'-construct' );
3564                         $wgOutputReplace = array();
3565                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3566                                 $pdbk = $pdbks[$key];
3567                                 $searchkey = "<!--LINK $key-->";
3568                                 $title = $this->mLinkHolders['titles'][$key];
3569                                 if ( empty( $colours[$pdbk] ) ) {
3570                                         $linkCache->addBadLinkObj( $title );
3571                                         $colours[$pdbk] = 0;
3572                                         $this->mOutput->addLink( $title, 0 );
3573                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3574                                                                         $this->mLinkHolders['texts'][$key],
3575                                                                         $this->mLinkHolders['queries'][$key] );
3576                                 } elseif ( $colours[$pdbk] == 1 ) {
3577                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3578                                                                         $this->mLinkHolders['texts'][$key],
3579                                                                         $this->mLinkHolders['queries'][$key] );
3580                                 } elseif ( $colours[$pdbk] == 2 ) {
3581                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3582                                                                         $this->mLinkHolders['texts'][$key],
3583                                                                         $this->mLinkHolders['queries'][$key] );
3584                                 }
3585                         }
3586                         wfProfileOut( $fname.'-construct' );
3587
3588                         # Do the thing
3589                         wfProfileIn( $fname.'-replace' );
3590
3591                         $text = preg_replace_callback(
3592                                 '/(<!--LINK .*?-->)/',
3593                                 "wfOutputReplaceMatches",
3594                                 $text);
3595
3596                         wfProfileOut( $fname.'-replace' );
3597                 }
3598
3599                 # Now process interwiki link holders
3600                 # This is quite a bit simpler than internal links
3601                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3602                         wfProfileIn( $fname.'-interwiki' );
3603                         # Make interwiki link HTML
3604                         $wgOutputReplace = array();
3605                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3606                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3607                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3608                         }
3609
3610                         $text = preg_replace_callback(
3611                                 '/<!--IWLINK (.*?)-->/',
3612                                 "wfOutputReplaceMatches",
3613                                 $text );
3614                         wfProfileOut( $fname.'-interwiki' );
3615                 }
3616
3617                 wfProfileOut( $fname );
3618                 return $colours;
3619         }
3620
3621         /**
3622          * Replace <!--LINK--> link placeholders with plain text of links
3623          * (not HTML-formatted).
3624          * @param string $text
3625          * @return string
3626          */
3627         function replaceLinkHoldersText( $text ) {
3628                 global $wgUser;
3629                 global $wgOutputReplace;
3630
3631                 $fname = 'Parser::replaceLinkHoldersText';
3632                 wfProfileIn( $fname );
3633
3634                 $text = preg_replace_callback(
3635                         '/<!--(LINK|IWLINK) (.*?)-->/',
3636                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3637                         $text );
3638
3639                 wfProfileOut( $fname );
3640                 return $text;
3641         }
3642
3643         /**
3644          * @param array $matches
3645          * @return string
3646          * @access private
3647          */
3648         function replaceLinkHoldersTextCallback( $matches ) {
3649                 $type = $matches[1];
3650                 $key  = $matches[2];
3651                 if( $type == 'LINK' ) {
3652                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3653                                 return $this->mLinkHolders['texts'][$key];
3654                         }
3655                 } elseif( $type == 'IWLINK' ) {
3656                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3657                                 return $this->mInterwikiLinkHolders['texts'][$key];
3658                         }
3659                 }
3660                 return $matches[0];
3661         }
3662
3663         /**
3664          * Renders an image gallery from a text with one line per image.
3665          * text labels may be given by using |-style alternative text. E.g.
3666          *   Image:one.jpg|The number "1"
3667          *   Image:tree.jpg|A tree
3668          * given as text will return the HTML of a gallery with two images,
3669          * labeled 'The number "1"' and
3670          * 'A tree'.
3671          */
3672         function renderImageGallery( $text ) {
3673                 # Setup the parser
3674                 $parserOptions = new ParserOptions;
3675                 $localParser = new Parser();
3676
3677                 $ig = new ImageGallery();
3678                 $ig->setShowBytes( false );
3679                 $ig->setShowFilename( false );
3680                 $lines = explode( "\n", $text );
3681
3682                 foreach ( $lines as $line ) {
3683                         # match lines like these:
3684                         # Image:someimage.jpg|This is some image
3685                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3686                         # Skip empty lines
3687                         if ( count( $matches ) == 0 ) {
3688                                 continue;
3689                         }
3690                         $nt =& Title::newFromText( $matches[1] );
3691                         if( is_null( $nt ) ) {
3692                                 # Bogus title. Ignore these so we don't bomb out later.
3693                                 continue;
3694                         }
3695                         if ( isset( $matches[3] ) ) {
3696                                 $label = $matches[3];
3697                         } else {
3698                                 $label = '';
3699                         }
3700
3701                         $pout = $localParser->parse( $label , $this->mTitle, $parserOptions );
3702                         $html = $pout->getText();
3703
3704                         $ig->add( new Image( $nt ), $html );
3705                         $this->mOutput->addImage( $nt->getDBkey() );
3706                 }
3707                 return $ig->toHTML();
3708         }
3709
3710         /**
3711          * Parse image options text and use it to make an image
3712          */
3713         function makeImage( &$nt, $options ) {
3714                 global $wgContLang, $wgUseImageResize, $wgUser;
3715
3716                 $align = '';
3717
3718                 # Check if the options text is of the form "options|alt text"
3719                 # Options are:
3720                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3721                 #  * left               no resizing, just left align. label is used for alt= only
3722                 #  * right              same, but right aligned
3723                 #  * none               same, but not aligned
3724                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3725                 #  * center             center the image
3726                 #  * framed             Keep original image size, no magnify-button.
3727
3728                 $part = explode( '|', $options);
3729
3730                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3731                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3732                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3733                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3734                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3735                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3736                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3737                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3738                 $caption = '';
3739
3740                 $width = $height = $framed = $thumb = false;
3741                 $manual_thumb = '' ;
3742
3743                 foreach( $part as $key => $val ) {
3744                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3745                                 $thumb=true;
3746                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3747                                 # use manually specified thumbnail
3748                                 $thumb=true;
3749                                 $manual_thumb = $match;
3750                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3751                                 # remember to set an alignment, don't render immediately
3752                                 $align = 'right';
3753                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
3754                                 # remember to set an alignment, don't render immediately
3755                                 $align = 'left';
3756                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
3757                                 # remember to set an alignment, don't render immediately
3758                                 $align = 'center';
3759                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
3760                                 # remember to set an alignment, don't render immediately
3761                                 $align = 'none';
3762                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
3763                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
3764                                 # $match is the image width in pixels
3765                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
3766                                         $width = intval( $m[1] );
3767                                         $height = intval( $m[2] );
3768                                 } else {
3769                                         $width = intval($match);
3770                                 }
3771                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
3772                                 $framed=true;
3773                         } else {
3774                                 $caption = $val;
3775                         }
3776                 }
3777                 # Strip bad stuff out of the alt text
3778                 $alt = $this->replaceLinkHoldersText( $caption );
3779                 $alt = Sanitizer::stripAllTags( $alt );
3780
3781                 # Linker does the rest
3782                 $sk =& $this->mOptions->getSkin();
3783                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
3784         }
3785
3786         /**
3787          * Set a flag in the output object indicating that the content is dynamic and
3788          * shouldn't be cached.
3789          */
3790         function disableCache() {
3791                 $this->mOutput->mCacheTime = -1;
3792         }
3793
3794         /**#@+
3795          * Callback from the Sanitizer for expanding items found in HTML attribute
3796          * values, so they can be safely tested and escaped.
3797          * @param string $text
3798          * @param array $args
3799          * @return string
3800          * @access private
3801          */
3802         function attributeStripCallback( &$text, $args ) {
3803                 $text = $this->replaceVariables( $text, $args );
3804                 $text = $this->unstripForHTML( $text );
3805                 return $text;
3806         }
3807
3808         function unstripForHTML( $text ) {
3809                 $text = $this->unstrip( $text, $this->mStripState );
3810                 $text = $this->unstripNoWiki( $text, $this->mStripState );
3811                 return $text;
3812         }
3813         /**#@-*/
3814
3815         /**#@+
3816          * Accessor/mutator
3817          */
3818         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
3819         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
3820         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
3821         /**#@-*/
3822
3823         /**#@+
3824          * Accessor
3825          */
3826         function getTags() { return array_keys( $this->mTagHooks ); }
3827         /**#@-*/
3828 }
3829
3830 /**
3831  * @todo document
3832  * @package MediaWiki
3833  */
3834 class ParserOutput
3835 {
3836         var $mText,             # The output text
3837                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
3838                 $mCategories,       # Map of category names to sort keys
3839                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
3840                 $mCacheTime,        # Timestamp on this article, or -1 for uncacheable. Used in ParserCache.
3841                 $mVersion,          # Compatibility check
3842                 $mTitleText,        # title text of the chosen language variant
3843                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
3844                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
3845                 $mImages,           # DB keys of the images used, in the array key only
3846                 $mExternalLinks;    # External link URLs, in the key only
3847
3848         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
3849                 $containsOldMagic = false, $titletext = '' )
3850         {
3851                 $this->mText = $text;
3852                 $this->mLanguageLinks = $languageLinks;
3853                 $this->mCategories = $categoryLinks;
3854                 $this->mContainsOldMagic = $containsOldMagic;
3855                 $this->mCacheTime = '';
3856                 $this->mVersion = MW_PARSER_VERSION;
3857                 $this->mTitleText = $titletext;
3858                 $this->mLinks = array();
3859                 $this->mTemplates = array();
3860                 $this->mImages = array();
3861                 $this->mExternalLinks = array();
3862         }
3863
3864         function getText()                   { return $this->mText; }
3865         function getLanguageLinks()          { return $this->mLanguageLinks; }
3866         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
3867         function &getCategories()            { return $this->mCategories; }
3868         function getCacheTime()              { return $this->mCacheTime; }
3869         function getTitleText()              { return $this->mTitleText; }
3870         function &getLinks()                 { return $this->mLinks; }
3871         function &getTemplates()             { return $this->mTemplates; }
3872         function &getImages()                { return $this->mImages; }
3873         function &getExternalLinks()         { return $this->mExternalLinks; }
3874
3875         function containsOldMagic()          { return $this->mContainsOldMagic; }
3876         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
3877         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
3878         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
3879         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
3880         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
3881         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
3882
3883         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
3884         function addImage( $name )           { $this->mImages[$name] = 1; }
3885         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
3886         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
3887
3888         function addLink( $title, $id ) {
3889                 $ns = $title->getNamespace();
3890                 $dbk = $title->getDBkey();
3891                 if ( !isset( $this->mLinks[$ns] ) ) {
3892                         $this->mLinks[$ns] = array();
3893                 }
3894                 $this->mLinks[$ns][$dbk] = $id;
3895         }
3896
3897         function addTemplate( $title, $id ) {
3898                 $ns = $title->getNamespace();
3899                 $dbk = $title->getDBkey();
3900                 if ( !isset( $this->mTemplates[$ns] ) ) {
3901                         $this->mTemplates[$ns] = array();
3902                 }
3903                 $this->mTemplates[$ns][$dbk] = $id;
3904         }
3905
3906         /**
3907          * @deprecated
3908          */
3909         /*
3910         function merge( $other ) {
3911                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $other->mLanguageLinks );
3912                 $this->mCategories = array_merge( $this->mCategories, $this->mLanguageLinks );
3913                 $this->mContainsOldMagic = $this->mContainsOldMagic || $other->mContainsOldMagic;
3914         }*/
3915
3916         /**
3917          * Return true if this cached output object predates the global or
3918          * per-article cache invalidation timestamps, or if it comes from
3919          * an incompatible older version.
3920          *
3921          * @param string $touched the affected article's last touched timestamp
3922          * @return bool
3923          * @access public
3924          */
3925         function expired( $touched ) {
3926                 global $wgCacheEpoch;
3927                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
3928                        $this->getCacheTime() < $touched ||
3929                        $this->getCacheTime() <= $wgCacheEpoch ||
3930                        !isset( $this->mVersion ) ||
3931                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
3932         }
3933 }
3934
3935 /**
3936  * Set options of the Parser
3937  * @todo document
3938  * @package MediaWiki
3939  */
3940 class ParserOptions
3941 {
3942         # All variables are private
3943         var $mUseTeX;                    # Use texvc to expand <math> tags
3944         var $mUseDynamicDates;           # Use DateFormatter to format dates
3945         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
3946         var $mAllowExternalImages;       # Allow external images inline
3947         var $mAllowExternalImagesFrom;   # If not, any exception?
3948         var $mSkin;                      # Reference to the preferred skin
3949         var $mDateFormat;                # Date format index
3950         var $mEditSection;               # Create "edit section" links
3951         var $mNumberHeadings;            # Automatically number headings
3952         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
3953         var $mTidy;                      # Ask for tidy cleanup
3954
3955         function getUseTeX()                        { return $this->mUseTeX; }
3956         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
3957         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
3958         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
3959         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
3960         function &getSkin()                         { return $this->mSkin; }
3961         function getDateFormat()                    { return $this->mDateFormat; }
3962         function getEditSection()                   { return $this->mEditSection; }
3963         function getNumberHeadings()                { return $this->mNumberHeadings; }
3964         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
3965         function getTidy()                          { return $this->mTidy; }
3966
3967         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
3968         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
3969         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
3970         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
3971         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
3972         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
3973         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
3974         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
3975         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
3976         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
3977         function setSkin( &$x ) { $this->mSkin =& $x; }
3978
3979         function ParserOptions() {
3980                 global $wgUser;
3981                 $this->initialiseFromUser( $wgUser );
3982         }
3983
3984         /**
3985          * Get parser options
3986          * @static
3987          */
3988         function newFromUser( &$user ) {
3989                 $popts = new ParserOptions;
3990                 $popts->initialiseFromUser( $user );
3991                 return $popts;
3992         }
3993
3994         /** Get user options */
3995         function initialiseFromUser( &$userInput ) {
3996                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages,
3997                        $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
3998                 $fname = 'ParserOptions::initialiseFromUser';
3999                 wfProfileIn( $fname );
4000                 if ( !$userInput ) {
4001                         $user = new User;
4002                         $user->setLoaded( true );
4003                 } else {
4004                         $user =& $userInput;
4005                 }
4006
4007                 $this->mUseTeX = $wgUseTeX;
4008                 $this->mUseDynamicDates = $wgUseDynamicDates;
4009                 $this->mInterwikiMagic = $wgInterwikiMagic;
4010                 $this->mAllowExternalImages = $wgAllowExternalImages;
4011                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4012                 wfProfileIn( $fname.'-skin' );
4013                 $this->mSkin =& $user->getSkin();
4014                 wfProfileOut( $fname.'-skin' );
4015                 $this->mDateFormat = $user->getOption( 'date' );
4016                 $this->mEditSection = true;
4017                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4018                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4019                 $this->mTidy = false;
4020                 wfProfileOut( $fname );
4021         }
4022 }
4023
4024 /**
4025  * Callback function used by Parser::replaceLinkHolders()
4026  * to substitute link placeholders.
4027  */
4028 function &wfOutputReplaceMatches( $matches ) {
4029         global $wgOutputReplace;
4030         return $wgOutputReplace[$matches[1]];
4031 }
4032
4033 /**
4034  * Return the total number of articles
4035  */
4036 function wfNumberOfArticles() {
4037         global $wgNumberOfArticles;
4038
4039         wfLoadSiteStats();
4040         return $wgNumberOfArticles;
4041 }
4042
4043 /**
4044  * Return the number of files
4045  */
4046 function wfNumberOfFiles() {
4047         $fname = 'Parser::wfNumberOfFiles';
4048
4049         wfProfileIn( $fname );
4050         $dbr =& wfGetDB( DB_SLAVE );
4051         $res = $dbr->selectField('image', 'COUNT(*)', array(), $fname );
4052         wfProfileOut( $fname );
4053
4054         return $res;
4055 }
4056
4057 /**
4058  * Get various statistics from the database
4059  * @access private
4060  */
4061 function wfLoadSiteStats() {
4062         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4063         $fname = 'wfLoadSiteStats';
4064
4065         if ( -1 != $wgNumberOfArticles ) return;
4066         $dbr =& wfGetDB( DB_SLAVE );
4067         $s = $dbr->selectRow( 'site_stats',
4068                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4069                 array( 'ss_row_id' => 1 ), $fname
4070         );
4071
4072         if ( $s === false ) {
4073                 return;
4074         } else {
4075                 $wgTotalViews = $s->ss_total_views;
4076                 $wgTotalEdits = $s->ss_total_edits;
4077                 $wgNumberOfArticles = $s->ss_good_articles;
4078         }
4079 }
4080
4081 /**
4082  * Escape html tags
4083  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4084  *
4085  * @param string $in Text that might contain HTML tags
4086  * @return string Escaped string
4087  */
4088 function wfEscapeHTMLTagsOnly( $in ) {
4089         return str_replace(
4090                 array( '"', '>', '<' ),
4091                 array( '&quot;', '&gt;', '&lt;' ),
4092                 $in );
4093 }
4094
4095 ?>