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, $wgContLang
  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 parserConvert() 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                 # Side-effects: this calls $this->mOutput->setTitleText()
 243                 $text = $wgContLang->parserConvert( $text, $this );
 244
 245                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 246
 247                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 248
 249                 $text = Sanitizer::normalizeCharReferences( $text );
 250
 251                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 252                         $text = Parser::tidy($text);
 253                 } else {
 254                         # attempt to sanitize at least some nesting problems
 255                         # (bug #2702 and quite a few others)
 256                         $tidyregs = array(
 257                                 # ''Something [http://www.cool.com cool''] -->
 258                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 259                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 260                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 261                                 # fix up an anchor inside another anchor, only
 262                                 # at least for a single single nested link (bug 3695)
 263                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 264                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 265                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 266                                 # contains a div, so fix it up here; replace
 267                                 # div with escaped text
 268                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 269                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 270                                 # remove empty italic or bold tag pairs, some
 271                                 # introduced by rules above
 272                                 '/<([bi])><\/\\1>/' => ''
 273                         );
 274
 275                         $text = preg_replace(
 276                                 array_keys( $tidyregs ),
 277                                 array_values( $tidyregs ),
 278                                 $text );
 279                 }
 280
 281                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 282
 283                 $this->mOutput->setText( $text );
 284                 wfProfileOut( $fname );
 285
 286                 return $this->mOutput;
 287         }
 288
 289         /**
 290          * Get a random string
 291          *
 292          * @access private
 293          * @static
 294          */
 295         function getRandomString() {
 296                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 297         }
 298
 299         function &getTitle() { return $this->mTitle; }
 300         function getOptions() { return $this->mOptions; }
 301
 302         /**
 303          * Replaces all occurrences of <$tag>content</$tag> in the text
 304          * with a random marker and returns the new text. the output parameter
 305          * $content will be an associative array filled with data on the form
 306          * $unique_marker => content.
 307          *
 308          * If $content is already set, the additional entries will be appended
 309          * If $tag is set to STRIP_COMMENTS, the function will extract
 310          * <!-- HTML comments -->
 311          *
 312          * @access private
 313          * @static
 314          */
 315         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 316                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 317                 if ( !$content ) {
 318                         $content = array( );
 319                 }
 320                 $n = 1;
 321                 $stripped = '';
 322
 323                 if ( !$tags ) {
 324                         $tags = array( );
 325                 }
 326
 327                 if ( !$params ) {
 328                         $params = array( );
 329                 }
 330
 331                 if( $tag == STRIP_COMMENTS ) {
 332                         $start = '/<!--()()/';
 333                         $end   = '/-->/';
 334                 } else {
 335                         $start = "/<$tag(\\s+[^\\/>]*|\\s*)(\\/?)>/i";
 336                         $end   = "/<\\/$tag\\s*>/i";
 337                 }
 338
 339                 while ( '' != $text ) {
 340                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 341                         $stripped .= $p[0];
 342                         if( count( $p ) < 4 ) {
 343                                 break;
 344                         }
 345                         $attributes = $p[1];
 346                         $empty      = $p[2];
 347                         $inside     = $p[3];
 348
 349                         $marker = $rnd . sprintf('%08X', $n++);
 350                         $stripped .= $marker;
 351
 352                         $tags[$marker] = "<$tag$attributes$empty>";
 353                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 354
 355                         if ( $empty === '/' ) {
 356                                 // Empty element tag, <tag />
 357                                 $content[$marker] = null;
 358                                 $text = $inside;
 359                         } else {
 360                                 $q = preg_split( $end, $inside, 2 );
 361                                 $content[$marker] = $q[0];
 362                                 if( count( $q ) < 2 ) {
 363                                         # No end tag -- let it run out to the end of the text.
 364                                         break;
 365                                 } else {
 366                                         $text = $q[1];
 367                                 }
 368                         }
 369                 }
 370                 return $stripped;
 371         }
 372
 373         /**
 374          * Wrapper function for extractTagsAndParams
 375          * for cases where $tags and $params isn't needed
 376          * i.e. where tags will never have params, like <nowiki>
 377          *
 378          * @access private
 379          * @static
 380          */
 381         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 382                 $dummy_tags = array();
 383                 $dummy_params = array();
 384
 385                 return Parser::extractTagsAndParams( $tag, $text, $content,
 386                         $dummy_tags, $dummy_params, $uniq_prefix );
 387         }
 388
 389         /**
 390          * Strips and renders nowiki, pre, math, hiero
 391          * If $render is set, performs necessary rendering operations on plugins
 392          * Returns the text, and fills an array with data needed in unstrip()
 393          * If the $state is already a valid strip state, it adds to the state
 394          *
 395          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 396          *  will be stripped in addition to other tags. This is important
 397          *  for section editing, where these comments cause confusion when
 398          *  counting the sections in the wikisource
 399          *
 400          * @access private
 401          */
 402         function strip( $text, &$state, $stripcomments = false ) {
 403                 $render = ($this->mOutputType == OT_HTML);
 404                 $html_content = array();
 405                 $nowiki_content = array();
 406                 $math_content = array();
 407                 $pre_content = array();
 408                 $comment_content = array();
 409                 $ext_content = array();
 410                 $ext_tags = array();
 411                 $ext_params = array();
 412                 $gallery_content = array();
 413
 414                 # Replace any instances of the placeholders
 415                 $uniq_prefix = $this->mUniqPrefix;
 416                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 417
 418                 # html
 419                 global $wgRawHtml;
 420                 if( $wgRawHtml ) {
 421                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 422                         foreach( $html_content as $marker => $content ) {
 423                                 if ($render ) {
 424                                         # Raw and unchecked for validity.
 425                                         $html_content[$marker] = $content;
 426                                 } else {
 427                                         $html_content[$marker] = '<html>'.$content.'</html>';
 428                                 }
 429                         }
 430                 }
 431
 432                 # nowiki
 433                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 434                 foreach( $nowiki_content as $marker => $content ) {
 435                         if( $render ){
 436                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 437                         } else {
 438                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 439                         }
 440                 }
 441
 442                 # math
 443                 if( $this->mOptions->getUseTeX() ) {
 444                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 445                         foreach( $math_content as $marker => $content ){
 446                                 if( $render ) {
 447                                         $math_content[$marker] = renderMath( $content );
 448                                 } else {
 449                                         $math_content[$marker] = '<math>'.$content.'</math>';
 450                                 }
 451                         }
 452                 }
 453
 454                 # pre
 455                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 456                 foreach( $pre_content as $marker => $content ){
 457                         if( $render ){
 458                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 459                         } else {
 460                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 461                         }
 462                 }
 463
 464                 # gallery
 465                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 466                 foreach( $gallery_content as $marker => $content ) {
 467                         require_once( 'ImageGallery.php' );
 468                         if ( $render ) {
 469                                 $gallery_content[$marker] = $this->renderImageGallery( $content );
 470                         } else {
 471                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 472                         }
 473                 }
 474
 475                 # Comments
 476                 if($stripcomments) {
 477                         $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 478                         foreach( $comment_content as $marker => $content ){
 479                                 $comment_content[$marker] = '<!--'.$content.'-->';
 480                         }
 481                 }
 482
 483                 # Extensions
 484                 foreach ( $this->mTagHooks as $tag => $callback ) {
 485                         $ext_content[$tag] = array();
 486                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 487                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 488                         foreach( $ext_content[$tag] as $marker => $content ) {
 489                                 $full_tag = $ext_tags[$tag][$marker];
 490                                 $params = $ext_params[$tag][$marker];
 491                                 if ( $render )
 492                                         $ext_content[$tag][$marker] = call_user_func_array( $callback, array( $content, $params, &$this ) );
 493                                 else {
 494                                         if ( is_null( $content ) ) {
 495                                                 // Empty element tag
 496                                                 $ext_content[$tag][$marker] = $full_tag;
 497                                         } else {
 498                                                 $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 499                                         }
 500                                 }
 501                         }
 502                 }
 503
 504                 # Merge state with the pre-existing state, if there is one
 505                 if ( $state ) {
 506                         $state['html'] = $state['html'] + $html_content;
 507                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 508                         $state['math'] = $state['math'] + $math_content;
 509                         $state['pre'] = $state['pre'] + $pre_content;
 510                         $state['gallery'] = $state['gallery'] + $gallery_content;
 511                         $state['comment'] = $state['comment'] + $comment_content;
 512
 513                         foreach( $ext_content as $tag => $array ) {
 514                                 if ( array_key_exists( $tag, $state ) ) {
 515                                         $state[$tag] = $state[$tag] + $array;
 516                                 }
 517                         }
 518                 } else {
 519                         $state = array(
 520                           'html' => $html_content,
 521                           'nowiki' => $nowiki_content,
 522                           'math' => $math_content,
 523                           'pre' => $pre_content,
 524                           'gallery' => $gallery_content,
 525                           'comment' => $comment_content,
 526                         ) + $ext_content;
 527                 }
 528                 return $text;
 529         }
 530
 531         /**
 532          * restores pre, math, and hiero removed by strip()
 533          *
 534          * always call unstripNoWiki() after this one
 535          * @access private
 536          */
 537         function unstrip( $text, &$state ) {
 538                 if ( !is_array( $state ) ) {
 539                         return $text;
 540                 }
 541
 542                 # Must expand in reverse order, otherwise nested tags will be corrupted
 543                 foreach( array_reverse( $state, true ) as $tag => $contentDict ) {
 544                         if( $tag != 'nowiki' && $tag != 'html' ) {
 545                                 foreach( array_reverse( $contentDict, true ) as $uniq => $content ) {
 546                                         $text = str_replace( $uniq, $content, $text );
 547                                 }
 548                         }
 549                 }
 550
 551                 return $text;
 552         }
 553
 554         /**
 555          * always call this after unstrip() to preserve the order
 556          *
 557          * @access private
 558          */
 559         function unstripNoWiki( $text, &$state ) {
 560                 if ( !is_array( $state ) ) {
 561                         return $text;
 562                 }
 563
 564                 # Must expand in reverse order, otherwise nested tags will be corrupted
 565                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 566                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 567                 }
 568
 569                 global $wgRawHtml;
 570                 if ($wgRawHtml) {
 571                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 572                                 $text = str_replace( key( $state['html'] ), $content, $text );
 573                         }
 574                 }
 575
 576                 return $text;
 577         }
 578
 579         /**
 580          * Add an item to the strip state
 581          * Returns the unique tag which must be inserted into the stripped text
 582          * The tag will be replaced with the original text in unstrip()
 583          *
 584          * @access private
 585          */
 586         function insertStripItem( $text, &$state ) {
 587                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 588                 if ( !$state ) {
 589                         $state = array(
 590                           'html' => array(),
 591                           'nowiki' => array(),
 592                           'math' => array(),
 593                           'pre' => array(),
 594                           'comment' => array(),
 595                           'gallery' => array(),
 596                         );
 597                 }
 598                 $state['item'][$rnd] = $text;
 599                 return $rnd;
 600         }
 601
 602         /**
 603          * Interface with html tidy, used if $wgUseTidy = true.
 604          * If tidy isn't able to correct the markup, the original will be
 605          * returned in all its glory with a warning comment appended.
 606          *
 607          * Either the external tidy program or the in-process tidy extension
 608          * will be used depending on availability. Override the default
 609          * $wgTidyInternal setting to disable the internal if it's not working.
 610          *
 611          * @param string $text Hideous HTML input
 612          * @return string Corrected HTML output
 613          * @access public
 614          * @static
 615          */
 616         function tidy( $text ) {
 617                 global $wgTidyInternal;
 618                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 619 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 620 '<head><title>test</title></head><body>'.$text.'</body></html>';
 621                 if( $wgTidyInternal ) {
 622                         $correctedtext = Parser::internalTidy( $wrappedtext );
 623                 } else {
 624                         $correctedtext = Parser::externalTidy( $wrappedtext );
 625                 }
 626                 if( is_null( $correctedtext ) ) {
 627                         wfDebug( "Tidy error detected!\n" );
 628                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 629                 }
 630                 return $correctedtext;
 631         }
 632
 633         /**
 634          * Spawn an external HTML tidy process and get corrected markup back from it.
 635          *
 636          * @access private
 637          * @static
 638          */
 639         function externalTidy( $text ) {
 640                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 641                 $fname = 'Parser::externalTidy';
 642                 wfProfileIn( $fname );
 643
 644                 $cleansource = '';
 645                 $opts = ' -utf8';
 646
 647                 $descriptorspec = array(
 648                         0 => array('pipe', 'r'),
 649                         1 => array('pipe', 'w'),
 650                         2 => array('file', '/dev/null', 'a')
 651                 );
 652                 $pipes = array();
 653                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 654                 if (is_resource($process)) {
 655                         // Theoretically, this style of communication could cause a deadlock
 656                         // here. If the stdout buffer fills up, then writes to stdin could
 657                         // block. This doesn't appear to happen with tidy, because tidy only
 658                         // writes to stdout after it's finished reading from stdin. Search
 659                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 660                         fwrite($pipes[0], $text);
 661                         fclose($pipes[0]);
 662                         while (!feof($pipes[1])) {
 663                                 $cleansource .= fgets($pipes[1], 1024);
 664                         }
 665                         fclose($pipes[1]);
 666                         proc_close($process);
 667                 }
 668
 669                 wfProfileOut( $fname );
 670
 671                 if( $cleansource == '' && $text != '') {
 672                         // Some kind of error happened, so we couldn't get the corrected text.
 673                         // Just give up; we'll use the source text and append a warning.
 674                         return null;
 675                 } else {
 676                         return $cleansource;
 677                 }
 678         }
 679
 680         /**
 681          * Use the HTML tidy PECL extension to use the tidy library in-process,
 682          * saving the overhead of spawning a new process. Currently written to
 683          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 684          *
 685          * 'pear install tidy' should be able to compile the extension module.
 686          *
 687          * @access private
 688          * @static
 689          */
 690         function internalTidy( $text ) {
 691                 global $wgTidyConf;
 692                 $fname = 'Parser::internalTidy';
 693                 wfProfileIn( $fname );
 694
 695                 tidy_load_config( $wgTidyConf );
 696                 tidy_set_encoding( 'utf8' );
 697                 tidy_parse_string( $text );
 698                 tidy_clean_repair();
 699                 if( tidy_get_status() == 2 ) {
 700                         // 2 is magic number for fatal error
 701                         // http://www.php.net/manual/en/function.tidy-get-status.php
 702                         $cleansource = null;
 703                 } else {
 704                         $cleansource = tidy_get_output();
 705                 }
 706                 wfProfileOut( $fname );
 707                 return $cleansource;
 708         }
 709
 710         /**
 711          * parse the wiki syntax used to render tables
 712          *
 713          * @access private
 714          */
 715         function doTableStuff ( $t ) {
 716                 $fname = 'Parser::doTableStuff';
 717                 wfProfileIn( $fname );
 718
 719                 $t = explode ( "\n" , $t ) ;
 720                 $td = array () ; # Is currently a td tag open?
 721                 $ltd = array () ; # Was it TD or TH?
 722                 $tr = array () ; # Is currently a tr tag open?
 723                 $ltr = array () ; # tr attributes
 724                 $has_opened_tr = array(); # Did this table open a <tr> element?
 725                 $indent_level = 0; # indent level of the table
 726                 foreach ( $t AS $k => $x )
 727                 {
 728                         $x = trim ( $x ) ;
 729                         $fc = substr ( $x , 0 , 1 ) ;
 730                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 731                                 $indent_level = strlen( $matches[1] );
 732
 733                                 $attributes = $this->unstripForHTML( $matches[2] );
 734
 735                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 736                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 737                                 array_push ( $td , false ) ;
 738                                 array_push ( $ltd , '' ) ;
 739                                 array_push ( $tr , false ) ;
 740                                 array_push ( $ltr , '' ) ;
 741                                 array_push ( $has_opened_tr, false );
 742                         }
 743                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 744                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 745                                 $z = "</table>" . substr ( $x , 2);
 746                                 $l = array_pop ( $ltd ) ;
 747                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 748                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 749                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 750                                 array_pop ( $ltr ) ;
 751                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 752                         }
 753                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 754                                 $x = substr ( $x , 1 ) ;
 755                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 756                                 $z = '' ;
 757                                 $l = array_pop ( $ltd ) ;
 758                                 array_pop ( $has_opened_tr );
 759                                 array_push ( $has_opened_tr , true ) ;
 760                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 761                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 762                                 array_pop ( $ltr ) ;
 763                                 $t[$k] = $z ;
 764                                 array_push ( $tr , false ) ;
 765                                 array_push ( $td , false ) ;
 766                                 array_push ( $ltd , '' ) ;
 767                                 $attributes = $this->unstripForHTML( $x );
 768                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 769                         }
 770                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 771                                 # $x is a table row
 772                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 773                                         $fc = '+' ;
 774                                         $x = substr ( $x , 1 ) ;
 775                                 }
 776                                 $after = substr ( $x , 1 ) ;
 777                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 778                                 $after = explode ( '||' , $after ) ;
 779                                 $t[$k] = '' ;
 780
 781                                 # Loop through each table cell
 782                                 foreach ( $after AS $theline )
 783                                 {
 784                                         $z = '' ;
 785                                         if ( $fc != '+' )
 786                                         {
 787                                                 $tra = array_pop ( $ltr ) ;
 788                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 789                                                 array_push ( $tr , true ) ;
 790                                                 array_push ( $ltr , '' ) ;
 791                                                 array_pop ( $has_opened_tr );
 792                                                 array_push ( $has_opened_tr , true ) ;
 793                                         }
 794
 795                                         $l = array_pop ( $ltd ) ;
 796                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 797                                         if ( $fc == '|' ) $l = 'td' ;
 798                                         else if ( $fc == '!' ) $l = 'th' ;
 799                                         else if ( $fc == '+' ) $l = 'caption' ;
 800                                         else $l = '' ;
 801                                         array_push ( $ltd , $l ) ;
 802
 803                                         # Cell parameters
 804                                         $y = explode ( '|' , $theline , 2 ) ;
 805                                         # Note that a '|' inside an invalid link should not
 806                                         # be mistaken as delimiting cell parameters
 807                                         if ( strpos( $y[0], '[[' ) !== false ) {
 808                                                 $y = array ($theline);
 809                                         }
 810                                         if ( count ( $y ) == 1 )
 811                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 812                                         else {
 813                                                 $attributes = $this->unstripForHTML( $y[0] );
 814                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 815                                         }
 816                                         $t[$k] .= $y ;
 817                                         array_push ( $td , true ) ;
 818                                 }
 819                         }
 820                 }
 821
 822                 # Closing open td, tr && table
 823                 while ( count ( $td ) > 0 )
 824                 {
 825                         $l = array_pop ( $ltd ) ;
 826                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 827                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 828                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 829                         $t[] = '</table>' ;
 830                 }
 831
 832                 $t = implode ( "\n" , $t ) ;
 833                 wfProfileOut( $fname );
 834                 return $t ;
 835         }
 836
 837         /**
 838          * Helper function for parse() that transforms wiki markup into
 839          * HTML. Only called for $mOutputType == OT_HTML.
 840          *
 841          * @access private
 842          */
 843         function internalParse( $text ) {
 844                 $args = array();
 845                 $isMain = true;
 846                 $fname = 'Parser::internalParse';
 847                 wfProfileIn( $fname );
 848
 849                 # Remove <noinclude> tags and <includeonly> sections
 850                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 851                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 852                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 853
 854                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 855                 $text = $this->replaceVariables( $text, $args );
 856
 857                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 858
 859                 $text = $this->doHeadings( $text );
 860                 if($this->mOptions->getUseDynamicDates()) {
 861                         $df =& DateFormatter::getInstance();
 862                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 863                 }
 864                 $text = $this->doAllQuotes( $text );
 865                 $text = $this->replaceInternalLinks( $text );
 866                 $text = $this->replaceExternalLinks( $text );
 867
 868                 # replaceInternalLinks may sometimes leave behind
 869                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 870                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 871
 872                 $text = $this->doMagicLinks( $text );
 873                 $text = $this->doTableStuff( $text );
 874                 $text = $this->formatHeadings( $text, $isMain );
 875
 876                 wfProfileOut( $fname );
 877                 return $text;
 878         }
 879
 880         /**
 881          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 882          * magic external links.
 883          *
 884          * @access private
 885          */
 886         function &doMagicLinks( &$text ) {
 887                 $text = $this->magicISBN( $text );
 888                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 889                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 890                 return $text;
 891         }
 892
 893         /**
 894          * Parse headers and return html
 895          *
 896          * @access private
 897          */
 898         function doHeadings( $text ) {
 899                 $fname = 'Parser::doHeadings';
 900                 wfProfileIn( $fname );
 901                 for ( $i = 6; $i >= 1; --$i ) {
 902                         $h = str_repeat( '=', $i );
 903                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 904                           "<h{$i}>\\1</h{$i}>\\2", $text );
 905                 }
 906                 wfProfileOut( $fname );
 907                 return $text;
 908         }
 909
 910         /**
 911          * Replace single quotes with HTML markup
 912          * @access private
 913          * @return string the altered text
 914          */
 915         function doAllQuotes( $text ) {
 916                 $fname = 'Parser::doAllQuotes';
 917                 wfProfileIn( $fname );
 918                 $outtext = '';
 919                 $lines = explode( "\n", $text );
 920                 foreach ( $lines as $line ) {
 921                         $outtext .= $this->doQuotes ( $line ) . "\n";
 922                 }
 923                 $outtext = substr($outtext, 0,-1);
 924                 wfProfileOut( $fname );
 925                 return $outtext;
 926         }
 927
 928         /**
 929          * Helper function for doAllQuotes()
 930          * @access private
 931          */
 932         function doQuotes( $text ) {
 933                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 934                 if ( count( $arr ) == 1 )
 935                         return $text;
 936                 else
 937                 {
 938                         # First, do some preliminary work. This may shift some apostrophes from
 939                         # being mark-up to being text. It also counts the number of occurrences
 940                         # of bold and italics mark-ups.
 941                         $i = 0;
 942                         $numbold = 0;
 943                         $numitalics = 0;
 944                         foreach ( $arr as $r )
 945                         {
 946                                 if ( ( $i % 2 ) == 1 )
 947                                 {
 948                                         # If there are ever four apostrophes, assume the first is supposed to
 949                                         # be text, and the remaining three constitute mark-up for bold text.
 950                                         if ( strlen( $arr[$i] ) == 4 )
 951                                         {
 952                                                 $arr[$i-1] .= "'";
 953                                                 $arr[$i] = "'''";
 954                                         }
 955                                         # If there are more than 5 apostrophes in a row, assume they're all
 956                                         # text except for the last 5.
 957                                         else if ( strlen( $arr[$i] ) > 5 )
 958                                         {
 959                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 960                                                 $arr[$i] = "'''''";
 961                                         }
 962                                         # Count the number of occurrences of bold and italics mark-ups.
 963                                         # We are not counting sequences of five apostrophes.
 964                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 965                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 966                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 967                                 }
 968                                 $i++;
 969                         }
 970
 971                         # If there is an odd number of both bold and italics, it is likely
 972                         # that one of the bold ones was meant to be an apostrophe followed
 973                         # by italics. Which one we cannot know for certain, but it is more
 974                         # likely to be one that has a single-letter word before it.
 975                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 976                         {
 977                                 $i = 0;
 978                                 $firstsingleletterword = -1;
 979                                 $firstmultiletterword = -1;
 980                                 $firstspace = -1;
 981                                 foreach ( $arr as $r )
 982                                 {
 983                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 984                                         {
 985                                                 $x1 = substr ($arr[$i-1], -1);
 986                                                 $x2 = substr ($arr[$i-1], -2, 1);
 987                                                 if ($x1 == ' ') {
 988                                                         if ($firstspace == -1) $firstspace = $i;
 989                                                 } else if ($x2 == ' ') {
 990                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 991                                                 } else {
 992                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 993                                                 }
 994                                         }
 995                                         $i++;
 996                                 }
 997
 998                                 # If there is a single-letter word, use it!
 999                                 if ($firstsingleletterword > -1)
1000                                 {
1001                                         $arr [ $firstsingleletterword ] = "''";
1002                                         $arr [ $firstsingleletterword-1 ] .= "'";
1003                                 }
1004                                 # If not, but there's a multi-letter word, use that one.
1005                                 else if ($firstmultiletterword > -1)
1006                                 {
1007                                         $arr [ $firstmultiletterword ] = "''";
1008                                         $arr [ $firstmultiletterword-1 ] .= "'";
1009                                 }
1010                                 # ... otherwise use the first one that has neither.
1011                                 # (notice that it is possible for all three to be -1 if, for example,
1012                                 # there is only one pentuple-apostrophe in the line)
1013                                 else if ($firstspace > -1)
1014                                 {
1015                                         $arr [ $firstspace ] = "''";
1016                                         $arr [ $firstspace-1 ] .= "'";
1017                                 }
1018                         }
1019
1020                         # Now let's actually convert our apostrophic mush to HTML!
1021                         $output = '';
1022                         $buffer = '';
1023                         $state = '';
1024                         $i = 0;
1025                         foreach ($arr as $r)
1026                         {
1027                                 if (($i % 2) == 0)
1028                                 {
1029                                         if ($state == 'both')
1030                                                 $buffer .= $r;
1031                                         else
1032                                                 $output .= $r;
1033                                 }
1034                                 else
1035                                 {
1036                                         if (strlen ($r) == 2)
1037                                         {
1038                                                 if ($state == 'i')
1039                                                 { $output .= '</i>'; $state = ''; }
1040                                                 else if ($state == 'bi')
1041                                                 { $output .= '</i>'; $state = 'b'; }
1042                                                 else if ($state == 'ib')
1043                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1044                                                 else if ($state == 'both')
1045                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1046                                                 else # $state can be 'b' or ''
1047                                                 { $output .= '<i>'; $state .= 'i'; }
1048                                         }
1049                                         else if (strlen ($r) == 3)
1050                                         {
1051                                                 if ($state == 'b')
1052                                                 { $output .= '</b>'; $state = ''; }
1053                                                 else if ($state == 'bi')
1054                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1055                                                 else if ($state == 'ib')
1056                                                 { $output .= '</b>'; $state = 'i'; }
1057                                                 else if ($state == 'both')
1058                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1059                                                 else # $state can be 'i' or ''
1060                                                 { $output .= '<b>'; $state .= 'b'; }
1061                                         }
1062                                         else if (strlen ($r) == 5)
1063                                         {
1064                                                 if ($state == 'b')
1065                                                 { $output .= '</b><i>'; $state = 'i'; }
1066                                                 else if ($state == 'i')
1067                                                 { $output .= '</i><b>'; $state = 'b'; }
1068                                                 else if ($state == 'bi')
1069                                                 { $output .= '</i></b>'; $state = ''; }
1070                                                 else if ($state == 'ib')
1071                                                 { $output .= '</b></i>'; $state = ''; }
1072                                                 else if ($state == 'both')
1073                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1074                                                 else # ($state == '')
1075                                                 { $buffer = ''; $state = 'both'; }
1076                                         }
1077                                 }
1078                                 $i++;
1079                         }
1080                         # Now close all remaining tags.  Notice that the order is important.
1081                         if ($state == 'b' || $state == 'ib')
1082                                 $output .= '</b>';
1083                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1084                                 $output .= '</i>';
1085                         if ($state == 'bi')
1086                                 $output .= '</b>';
1087                         if ($state == 'both')
1088                                 $output .= '<b><i>'.$buffer.'</i></b>';
1089                         return $output;
1090                 }
1091         }
1092
1093         /**
1094          * Replace external links
1095          *
1096          * Note: this is all very hackish and the order of execution matters a lot.
1097          * Make sure to run maintenance/parserTests.php if you change this code.
1098          *
1099          * @access private
1100          */
1101         function replaceExternalLinks( $text ) {
1102                 global $wgContLang;
1103                 $fname = 'Parser::replaceExternalLinks';
1104                 wfProfileIn( $fname );
1105
1106                 $sk =& $this->mOptions->getSkin();
1107
1108                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1109
1110                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1111
1112                 $i = 0;
1113                 while ( $i<count( $bits ) ) {
1114                         $url = $bits[$i++];
1115                         $protocol = $bits[$i++];
1116                         $text = $bits[$i++];
1117                         $trail = $bits[$i++];
1118
1119                         # The characters '<' and '>' (which were escaped by
1120                         # removeHTMLtags()) should not be included in
1121                         # URLs, per RFC 2396.
1122                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1123                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1124                                 $url = substr($url, 0, $m2[0][1]);
1125                         }
1126
1127                         # If the link text is an image URL, replace it with an <img> tag
1128                         # This happened by accident in the original parser, but some people used it extensively
1129                         $img = $this->maybeMakeExternalImage( $text );
1130                         if ( $img !== false ) {
1131                                 $text = $img;
1132                         }
1133
1134                         $dtrail = '';
1135
1136                         # Set linktype for CSS - if URL==text, link is essentially free
1137                         $linktype = ($text == $url) ? 'free' : 'text';
1138
1139                         # No link text, e.g. [http://domain.tld/some.link]
1140                         if ( $text == '' ) {
1141                                 # Autonumber if allowed
1142                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1143                                         $text = '[' . ++$this->mAutonumber . ']';
1144                                         $linktype = 'autonumber';
1145                                 } else {
1146                                         # Otherwise just use the URL
1147                                         $text = htmlspecialchars( $url );
1148                                         $linktype = 'free';
1149                                 }
1150                         } else {
1151                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1152                                 # Check for trail
1153                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1154                         }
1155
1156                         $text = $wgContLang->markNoConversion($text);
1157
1158                         # Replace &amp; from obsolete syntax with &.
1159                         # All HTML entities will be escaped by makeExternalLink()
1160                         $url = str_replace( '&amp;', '&', $url );
1161
1162                         # Process the trail (i.e. everything after this link up until start of the next link),
1163                         # replacing any non-bracketed links
1164                         $trail = $this->replaceFreeExternalLinks( $trail );
1165
1166                         # Use the encoded URL
1167                         # This means that users can paste URLs directly into the text
1168                         # Funny characters like &ouml; aren't valid in URLs anyway
1169                         # This was changed in August 2004
1170                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1171
1172                         # Register link in the output object.
1173                         # Replace unnecessary URL escape codes with the referenced character
1174                         # This prevents spammers from hiding links from the filters
1175                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1176                         $this->mOutput->addExternalLink( $pasteurized );
1177                 }
1178
1179                 wfProfileOut( $fname );
1180                 return $s;
1181         }
1182
1183         /**
1184          * Replace anything that looks like a URL with a link
1185          * @access private
1186          */
1187         function replaceFreeExternalLinks( $text ) {
1188                 global $wgContLang;
1189                 $fname = 'Parser::replaceFreeExternalLinks';
1190                 wfProfileIn( $fname );
1191
1192                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1193                 $s = array_shift( $bits );
1194                 $i = 0;
1195
1196                 $sk =& $this->mOptions->getSkin();
1197
1198                 while ( $i < count( $bits ) ){
1199                         $protocol = $bits[$i++];
1200                         $remainder = $bits[$i++];
1201
1202                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1203                                 # Found some characters after the protocol that look promising
1204                                 $url = $protocol . $m[1];
1205                                 $trail = $m[2];
1206
1207                                 # The characters '<' and '>' (which were escaped by
1208                                 # removeHTMLtags()) should not be included in
1209                                 # URLs, per RFC 2396.
1210                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1211                                         $trail = substr($url, $m2[0][1]) . $trail;
1212                                         $url = substr($url, 0, $m2[0][1]);
1213                                 }
1214
1215                                 # Move trailing punctuation to $trail
1216                                 $sep = ',;\.:!?';
1217                                 # If there is no left bracket, then consider right brackets fair game too
1218                                 if ( strpos( $url, '(' ) === false ) {
1219                                         $sep .= ')';
1220                                 }
1221
1222                                 $numSepChars = strspn( strrev( $url ), $sep );
1223                                 if ( $numSepChars ) {
1224                                         $trail = substr( $url, -$numSepChars ) . $trail;
1225                                         $url = substr( $url, 0, -$numSepChars );
1226                                 }
1227
1228                                 # Replace &amp; from obsolete syntax with &.
1229                                 # All HTML entities will be escaped by makeExternalLink()
1230                                 # or maybeMakeExternalImage()
1231                                 $url = str_replace( '&amp;', '&', $url );
1232
1233                                 # Is this an external image?
1234                                 $text = $this->maybeMakeExternalImage( $url );
1235                                 if ( $text === false ) {
1236                                         # Not an image, make a link
1237                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1238                                         # Register it in the output object...
1239                                         # Replace unnecessary URL escape codes with their equivalent characters
1240                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1241                                         $this->mOutput->addExternalLink( $pasteurized );
1242                                 }
1243                                 $s .= $text . $trail;
1244                         } else {
1245                                 $s .= $protocol . $remainder;
1246                         }
1247                 }
1248                 wfProfileOut( $fname );
1249                 return $s;
1250         }
1251
1252         /**
1253          * Replace unusual URL escape codes with their equivalent characters
1254          * @param string
1255          * @return string
1256          * @static
1257          * @fixme This can merge genuinely required bits in the path or query string,
1258          *        breaking legit URLs. A proper fix would treat the various parts of
1259          *        the URL differently; as a workaround, just use the output for
1260          *        statistical records, not for actual linking/output.
1261          */
1262         function replaceUnusualEscapes( $url ) {
1263                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1264                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1265         }
1266
1267         /**
1268          * Callback function used in replaceUnusualEscapes().
1269          * Replaces unusual URL escape codes with their equivalent character
1270          * @static
1271          * @access private
1272          */
1273         function replaceUnusualEscapesCallback( $matches ) {
1274                 $char = urldecode( $matches[0] );
1275                 $ord = ord( $char );
1276                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1277                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1278                         // No, shouldn't be escaped
1279                         return $char;
1280                 } else {
1281                         // Yes, leave it escaped
1282                         return $matches[0];
1283                 }
1284         }
1285
1286         /**
1287          * make an image if it's allowed, either through the global
1288          * option or through the exception
1289          * @access private
1290          */
1291         function maybeMakeExternalImage( $url ) {
1292                 $sk =& $this->mOptions->getSkin();
1293                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1294                 $imagesexception = !empty($imagesfrom);
1295                 $text = false;
1296                 if ( $this->mOptions->getAllowExternalImages()
1297                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1298                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1299                                 # Image found
1300                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1301                         }
1302                 }
1303                 return $text;
1304         }
1305
1306         /**
1307          * Process [[ ]] wikilinks
1308          *
1309          * @access private
1310          */
1311         function replaceInternalLinks( $s ) {
1312                 global $wgContLang;
1313                 static $fname = 'Parser::replaceInternalLinks' ;
1314
1315                 wfProfileIn( $fname );
1316
1317                 wfProfileIn( $fname.'-setup' );
1318                 static $tc = FALSE;
1319                 # the % is needed to support urlencoded titles as well
1320                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1321
1322                 $sk =& $this->mOptions->getSkin();
1323
1324                 #split the entire text string on occurences of [[
1325                 $a = explode( '[[', ' ' . $s );
1326                 #get the first element (all text up to first [[), and remove the space we added
1327                 $s = array_shift( $a );
1328                 $s = substr( $s, 1 );
1329
1330                 # Match a link having the form [[namespace:link|alternate]]trail
1331                 static $e1 = FALSE;
1332                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1333                 # Match cases where there is no "]]", which might still be images
1334                 static $e1_img = FALSE;
1335                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1336                 # Match the end of a line for a word that's not followed by whitespace,
1337                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1338                 $e2 = wfMsgForContent( 'linkprefix' );
1339
1340                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1341
1342                 if( is_null( $this->mTitle ) ) {
1343                         wfDebugDieBacktrace( 'nooo' );
1344                 }
1345                 $nottalk = !$this->mTitle->isTalkPage();
1346
1347                 if ( $useLinkPrefixExtension ) {
1348                         if ( preg_match( $e2, $s, $m ) ) {
1349                                 $first_prefix = $m[2];
1350                         } else {
1351                                 $first_prefix = false;
1352                         }
1353                 } else {
1354                         $prefix = '';
1355                 }
1356
1357                 $selflink = $this->mTitle->getPrefixedText();
1358                 wfProfileOut( $fname.'-setup' );
1359
1360                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1361                 $useSubpages = $this->areSubpagesAllowed();
1362
1363                 # Loop for each link
1364                 for ($k = 0; isset( $a[$k] ); $k++) {
1365                         $line = $a[$k];
1366                         if ( $useLinkPrefixExtension ) {
1367                                 wfProfileIn( $fname.'-prefixhandling' );
1368                                 if ( preg_match( $e2, $s, $m ) ) {
1369                                         $prefix = $m[2];
1370                                         $s = $m[1];
1371                                 } else {
1372                                         $prefix='';
1373                                 }
1374                                 # first link
1375                                 if($first_prefix) {
1376                                         $prefix = $first_prefix;
1377                                         $first_prefix = false;
1378                                 }
1379                                 wfProfileOut( $fname.'-prefixhandling' );
1380                         }
1381
1382                         $might_be_img = false;
1383
1384                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1385                                 $text = $m[2];
1386                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1387                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1388                                 # the real problem is with the $e1 regex
1389                                 # See bug 1300.
1390                                 #
1391                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1392                                 # and no image is in sight. See bug 2095.
1393                                 #
1394                                 if( $text !== '' && preg_match( "/^\](.*)/s", $m[3], $n ) ) {
1395                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1396                                         $m[3] = $n[1];
1397                                 }
1398                                 # fix up urlencoded title texts
1399                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1400                                 $trail = $m[3];
1401                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1402                                 $might_be_img = true;
1403                                 $text = $m[2];
1404                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1405                                 $trail = "";
1406                         } else { # Invalid form; output directly
1407                                 $s .= $prefix . '[[' . $line ;
1408                                 continue;
1409                         }
1410
1411                         # Don't allow internal links to pages containing
1412                         # PROTO: where PROTO is a valid URL protocol; these
1413                         # should be external links.
1414                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1415                                 $s .= $prefix . '[[' . $line ;
1416                                 continue;
1417                         }
1418
1419                         # Make subpage if necessary
1420                         if( $useSubpages ) {
1421                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1422                         } else {
1423                                 $link = $m[1];
1424                         }
1425
1426                         $noforce = (substr($m[1], 0, 1) != ':');
1427                         if (!$noforce) {
1428                                 # Strip off leading ':'
1429                                 $link = substr($link, 1);
1430                         }
1431
1432                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1433                         if( !$nt ) {
1434                                 $s .= $prefix . '[[' . $line;
1435                                 continue;
1436                         }
1437
1438                         #check other language variants of the link
1439                         #if the article does not exist
1440                         if( $checkVariantLink
1441                             && $nt->getArticleID() == 0 ) {
1442                                 $wgContLang->findVariantLink($link, $nt);
1443                         }
1444
1445                         $ns = $nt->getNamespace();
1446                         $iw = $nt->getInterWiki();
1447
1448                         if ($might_be_img) { # if this is actually an invalid link
1449                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1450                                         $found = false;
1451                                         while (isset ($a[$k+1]) ) {
1452                                                 #look at the next 'line' to see if we can close it there
1453                                                 $spliced = array_splice( $a, $k + 1, 1 );
1454                                                 $next_line = array_shift( $spliced );
1455                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1456                                                 # the first ]] closes the inner link, the second the image
1457                                                         $found = true;
1458                                                         $text .= '[[' . $m[1];
1459                                                         $trail = $m[2];
1460                                                         break;
1461                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1462                                                         #if there's exactly one ]] that's fine, we'll keep looking
1463                                                         $text .= '[[' . $m[0];
1464                                                 } else {
1465                                                         #if $next_line is invalid too, we need look no further
1466                                                         $text .= '[[' . $next_line;
1467                                                         break;
1468                                                 }
1469                                         }
1470                                         if ( !$found ) {
1471                                                 # we couldn't find the end of this imageLink, so output it raw
1472                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1473                                                 $text = $this->replaceInternalLinks($text);
1474                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1475                                                 # note: no $trail, because without an end, there *is* no trail
1476                                                 continue;
1477                                         }
1478                                 } else { #it's not an image, so output it raw
1479                                         $s .= $prefix . '[[' . $link . '|' . $text;
1480                                         # note: no $trail, because without an end, there *is* no trail
1481                                         continue;
1482                                 }
1483                         }
1484
1485                         $wasblank = ( '' == $text );
1486                         if( $wasblank ) $text = $link;
1487
1488
1489                         # Link not escaped by : , create the various objects
1490                         if( $noforce ) {
1491
1492                                 # Interwikis
1493                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1494                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1495                                         $s = rtrim($s . "\n");
1496                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1497                                         continue;
1498                                 }
1499
1500                                 if ( $ns == NS_IMAGE ) {
1501                                         wfProfileIn( "$fname-image" );
1502                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1503                                                 # recursively parse links inside the image caption
1504                                                 # actually, this will parse them in any other parameters, too,
1505                                                 # but it might be hard to fix that, and it doesn't matter ATM
1506                                                 $text = $this->replaceExternalLinks($text);
1507                                                 $text = $this->replaceInternalLinks($text);
1508
1509                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1510                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1511                                                 $this->mOutput->addImage( $nt->getDBkey() );
1512
1513                                                 wfProfileOut( "$fname-image" );
1514                                                 continue;
1515                                         }
1516                                         wfProfileOut( "$fname-image" );
1517
1518                                 }
1519
1520                                 if ( $ns == NS_CATEGORY ) {
1521                                         wfProfileIn( "$fname-category" );
1522                                         $s = rtrim($s . "\n"); # bug 87
1523
1524                                         if ( $wasblank ) {
1525                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1526                                                         $sortkey = $this->mTitle->getText();
1527                                                 } else {
1528                                                         $sortkey = $this->mTitle->getPrefixedText();
1529                                                 }
1530                                         } else {
1531                                                 $sortkey = $text;
1532                                         }
1533                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1534                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1535                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1536
1537                                         /**
1538                                          * Strip the whitespace Category links produce, see bug 87
1539                                          * @todo We might want to use trim($tmp, "\n") here.
1540                                          */
1541                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1542
1543                                         wfProfileOut( "$fname-category" );
1544                                         continue;
1545                                 }
1546                         }
1547
1548                         if( ( $nt->getPrefixedText() === $selflink ) &&
1549                             ( $nt->getFragment() === '' ) ) {
1550                                 # Self-links are handled specially; generally de-link and change to bold.
1551                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1552                                 continue;
1553                         }
1554
1555                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1556                         if( $ns == NS_MEDIA ) {
1557                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1558                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1559                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1560                                 $this->mOutput->addImage( $nt->getDBkey() );
1561                                 continue;
1562                         } elseif( $ns == NS_SPECIAL ) {
1563                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1564                                 continue;
1565                         } elseif( $ns == NS_IMAGE ) {
1566                                 $img = Image::newFromTitle( $nt );
1567                                 if( $img->exists() ) {
1568                                         // Force a blue link if the file exists; may be a remote
1569                                         // upload on the shared repository, and we want to see its
1570                                         // auto-generated page.
1571                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1572                                         continue;
1573                                 }
1574                         }
1575                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1576                 }
1577                 wfProfileOut( $fname );
1578                 return $s;
1579         }
1580
1581         /**
1582          * Make a link placeholder. The text returned can be later resolved to a real link with
1583          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1584          * parsing of interwiki links, and secondly to allow all extistence checks and
1585          * article length checks (for stub links) to be bundled into a single query.
1586          *
1587          */
1588         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1589                 if ( ! is_object($nt) ) {
1590                         # Fail gracefully
1591                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1592                 } else {
1593                         # Separate the link trail from the rest of the link
1594                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1595
1596                         if ( $nt->isExternal() ) {
1597                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1598                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1599                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1600                         } else {
1601                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1602                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1603                                 $this->mLinkHolders['queries'][] = $query;
1604                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1605                                 $this->mLinkHolders['titles'][] = $nt;
1606
1607                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1608                         }
1609                 }
1610                 return $retVal;
1611         }
1612
1613         /**
1614          * Render a forced-blue link inline; protect against double expansion of
1615          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1616          * Since this little disaster has to split off the trail text to avoid
1617          * breaking URLs in the following text without breaking trails on the
1618          * wiki links, it's been made into a horrible function.
1619          *
1620          * @param Title $nt
1621          * @param string $text
1622          * @param string $query
1623          * @param string $trail
1624          * @param string $prefix
1625          * @return string HTML-wikitext mix oh yuck
1626          */
1627         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1628                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1629                 $sk =& $this->mOptions->getSkin();
1630                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1631                 return $this->armorLinks( $link ) . $trail;
1632         }
1633
1634         /**
1635          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1636          * going to go through further parsing steps before inline URL expansion.
1637          *
1638          * In particular this is important when using action=render, which causes
1639          * full URLs to be included.
1640          *
1641          * Oh man I hate our multi-layer parser!
1642          *
1643          * @param string more-or-less HTML
1644          * @return string less-or-more HTML with NOPARSE bits
1645          */
1646         function armorLinks( $text ) {
1647                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1648                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1649         }
1650
1651         /**
1652          * Return true if subpage links should be expanded on this page.
1653          * @return bool
1654          */
1655         function areSubpagesAllowed() {
1656                 # Some namespaces don't allow subpages
1657                 global $wgNamespacesWithSubpages;
1658                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1659         }
1660
1661         /**
1662          * Handle link to subpage if necessary
1663          * @param string $target the source of the link
1664          * @param string &$text the link text, modified as necessary
1665          * @return string the full name of the link
1666          * @access private
1667          */
1668         function maybeDoSubpageLink($target, &$text) {
1669                 # Valid link forms:
1670                 # Foobar -- normal
1671                 # :Foobar -- override special treatment of prefix (images, language links)
1672                 # /Foobar -- convert to CurrentPage/Foobar
1673                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1674                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1675                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1676
1677                 $fname = 'Parser::maybeDoSubpageLink';
1678                 wfProfileIn( $fname );
1679                 $ret = $target; # default return value is no change
1680
1681                 # Some namespaces don't allow subpages,
1682                 # so only perform processing if subpages are allowed
1683                 if( $this->areSubpagesAllowed() ) {
1684                         # Look at the first character
1685                         if( $target != '' && $target{0} == '/' ) {
1686                                 # / at end means we don't want the slash to be shown
1687                                 if( substr( $target, -1, 1 ) == '/' ) {
1688                                         $target = substr( $target, 1, -1 );
1689                                         $noslash = $target;
1690                                 } else {
1691                                         $noslash = substr( $target, 1 );
1692                                 }
1693
1694                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1695                                 if( '' === $text ) {
1696                                         $text = $target;
1697                                 } # this might be changed for ugliness reasons
1698                         } else {
1699                                 # check for .. subpage backlinks
1700                                 $dotdotcount = 0;
1701                                 $nodotdot = $target;
1702                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1703                                         ++$dotdotcount;
1704                                         $nodotdot = substr( $nodotdot, 3 );
1705                                 }
1706                                 if($dotdotcount > 0) {
1707                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1708                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1709                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1710                                                 # / at the end means don't show full path
1711                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1712                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1713                                                         if( '' === $text ) {
1714                                                                 $text = $nodotdot;
1715                                                         }
1716                                                 }
1717                                                 $nodotdot = trim( $nodotdot );
1718                                                 if( $nodotdot != '' ) {
1719                                                         $ret .= '/' . $nodotdot;
1720                                                 }
1721                                         }
1722                                 }
1723                         }
1724                 }
1725
1726                 wfProfileOut( $fname );
1727                 return $ret;
1728         }
1729
1730         /**#@+
1731          * Used by doBlockLevels()
1732          * @access private
1733          */
1734         /* private */ function closeParagraph() {
1735                 $result = '';
1736                 if ( '' != $this->mLastSection ) {
1737                         $result = '</' . $this->mLastSection  . ">\n";
1738                 }
1739                 $this->mInPre = false;
1740                 $this->mLastSection = '';
1741                 return $result;
1742         }
1743         # getCommon() returns the length of the longest common substring
1744         # of both arguments, starting at the beginning of both.
1745         #
1746         /* private */ function getCommon( $st1, $st2 ) {
1747                 $fl = strlen( $st1 );
1748                 $shorter = strlen( $st2 );
1749                 if ( $fl < $shorter ) { $shorter = $fl; }
1750
1751                 for ( $i = 0; $i < $shorter; ++$i ) {
1752                         if ( $st1{$i} != $st2{$i} ) { break; }
1753                 }
1754                 return $i;
1755         }
1756         # These next three functions open, continue, and close the list
1757         # element appropriate to the prefix character passed into them.
1758         #
1759         /* private */ function openList( $char ) {
1760                 $result = $this->closeParagraph();
1761
1762                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1763                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1764                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1765                 else if ( ';' == $char ) {
1766                         $result .= '<dl><dt>';
1767                         $this->mDTopen = true;
1768                 }
1769                 else { $result = '<!-- ERR 1 -->'; }
1770
1771                 return $result;
1772         }
1773
1774         /* private */ function nextItem( $char ) {
1775                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1776                 else if ( ':' == $char || ';' == $char ) {
1777                         $close = '</dd>';
1778                         if ( $this->mDTopen ) { $close = '</dt>'; }
1779                         if ( ';' == $char ) {
1780                                 $this->mDTopen = true;
1781                                 return $close . '<dt>';
1782                         } else {
1783                                 $this->mDTopen = false;
1784                                 return $close . '<dd>';
1785                         }
1786                 }
1787                 return '<!-- ERR 2 -->';
1788         }
1789
1790         /* private */ function closeList( $char ) {
1791                 if ( '*' == $char ) { $text = '</li></ul>'; }
1792                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1793                 else if ( ':' == $char ) {
1794                         if ( $this->mDTopen ) {
1795                                 $this->mDTopen = false;
1796                                 $text = '</dt></dl>';
1797                         } else {
1798                                 $text = '</dd></dl>';
1799                         }
1800                 }
1801                 else {  return '<!-- ERR 3 -->'; }
1802                 return $text."\n";
1803         }
1804         /**#@-*/
1805
1806         /**
1807          * Make lists from lines starting with ':', '*', '#', etc.
1808          *
1809          * @access private
1810          * @return string the lists rendered as HTML
1811          */
1812         function doBlockLevels( $text, $linestart ) {
1813                 $fname = 'Parser::doBlockLevels';
1814                 wfProfileIn( $fname );
1815
1816                 # Parsing through the text line by line.  The main thing
1817                 # happening here is handling of block-level elements p, pre,
1818                 # and making lists from lines starting with * # : etc.
1819                 #
1820                 $textLines = explode( "\n", $text );
1821
1822                 $lastPrefix = $output = '';
1823                 $this->mDTopen = $inBlockElem = false;
1824                 $prefixLength = 0;
1825                 $paragraphStack = false;
1826
1827                 if ( !$linestart ) {
1828                         $output .= array_shift( $textLines );
1829                 }
1830                 foreach ( $textLines as $oLine ) {
1831                         $lastPrefixLength = strlen( $lastPrefix );
1832                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1833                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1834                         if ( !$this->mInPre ) {
1835                                 # Multiple prefixes may abut each other for nested lists.
1836                                 $prefixLength = strspn( $oLine, '*#:;' );
1837                                 $pref = substr( $oLine, 0, $prefixLength );
1838
1839                                 # eh?
1840                                 $pref2 = str_replace( ';', ':', $pref );
1841                                 $t = substr( $oLine, $prefixLength );
1842                                 $this->mInPre = !empty($preOpenMatch);
1843                         } else {
1844                                 # Don't interpret any other prefixes in preformatted text
1845                                 $prefixLength = 0;
1846                                 $pref = $pref2 = '';
1847                                 $t = $oLine;
1848                         }
1849
1850                         # List generation
1851                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1852                                 # Same as the last item, so no need to deal with nesting or opening stuff
1853                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1854                                 $paragraphStack = false;
1855
1856                                 if ( substr( $pref, -1 ) == ';') {
1857                                         # The one nasty exception: definition lists work like this:
1858                                         # ; title : definition text
1859                                         # So we check for : in the remainder text to split up the
1860                                         # title and definition, without b0rking links.
1861                                         $term = $t2 = '';
1862                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1863                                                 $t = $t2;
1864                                                 $output .= $term . $this->nextItem( ':' );
1865                                         }
1866                                 }
1867                         } elseif( $prefixLength || $lastPrefixLength ) {
1868                                 # Either open or close a level...
1869                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1870                                 $paragraphStack = false;
1871
1872                                 while( $commonPrefixLength < $lastPrefixLength ) {
1873                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1874                                         --$lastPrefixLength;
1875                                 }
1876                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1877                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1878                                 }
1879                                 while ( $prefixLength > $commonPrefixLength ) {
1880                                         $char = substr( $pref, $commonPrefixLength, 1 );
1881                                         $output .= $this->openList( $char );
1882
1883                                         if ( ';' == $char ) {
1884                                                 # FIXME: This is dupe of code above
1885                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1886                                                         $t = $t2;
1887                                                         $output .= $term . $this->nextItem( ':' );
1888                                                 }
1889                                         }
1890                                         ++$commonPrefixLength;
1891                                 }
1892                                 $lastPrefix = $pref2;
1893                         }
1894                         if( 0 == $prefixLength ) {
1895                                 wfProfileIn( "$fname-paragraph" );
1896                                 # No prefix (not in list)--go to paragraph mode
1897                                 // XXX: use a stack for nestable elements like span, table and div
1898                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1899                                 $closematch = preg_match(
1900                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1901                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1902                                 if ( $openmatch or $closematch ) {
1903                                         $paragraphStack = false;
1904                                         $output .= $this->closeParagraph();
1905                                         if ( $preOpenMatch and !$preCloseMatch ) {
1906                                                 $this->mInPre = true;
1907                                         }
1908                                         if ( $closematch ) {
1909                                                 $inBlockElem = false;
1910                                         } else {
1911                                                 $inBlockElem = true;
1912                                         }
1913                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1914                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1915                                                 // pre
1916                                                 if ($this->mLastSection != 'pre') {
1917                                                         $paragraphStack = false;
1918                                                         $output .= $this->closeParagraph().'<pre>';
1919                                                         $this->mLastSection = 'pre';
1920                                                 }
1921                                                 $t = substr( $t, 1 );
1922                                         } else {
1923                                                 // paragraph
1924                                                 if ( '' == trim($t) ) {
1925                                                         if ( $paragraphStack ) {
1926                                                                 $output .= $paragraphStack.'<br />';
1927                                                                 $paragraphStack = false;
1928                                                                 $this->mLastSection = 'p';
1929                                                         } else {
1930                                                                 if ($this->mLastSection != 'p' ) {
1931                                                                         $output .= $this->closeParagraph();
1932                                                                         $this->mLastSection = '';
1933                                                                         $paragraphStack = '<p>';
1934                                                                 } else {
1935                                                                         $paragraphStack = '</p><p>';
1936                                                                 }
1937                                                         }
1938                                                 } else {
1939                                                         if ( $paragraphStack ) {
1940                                                                 $output .= $paragraphStack;
1941                                                                 $paragraphStack = false;
1942                                                                 $this->mLastSection = 'p';
1943                                                         } else if ($this->mLastSection != 'p') {
1944                                                                 $output .= $this->closeParagraph().'<p>';
1945                                                                 $this->mLastSection = 'p';
1946                                                         }
1947                                                 }
1948                                         }
1949                                 }
1950                                 wfProfileOut( "$fname-paragraph" );
1951                         }
1952                         // somewhere above we forget to get out of pre block (bug 785)
1953                         if($preCloseMatch && $this->mInPre) {
1954                                 $this->mInPre = false;
1955                         }
1956                         if ($paragraphStack === false) {
1957                                 $output .= $t."\n";
1958                         }
1959                 }
1960                 while ( $prefixLength ) {
1961                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1962                         --$prefixLength;
1963                 }
1964                 if ( '' != $this->mLastSection ) {
1965                         $output .= '</' . $this->mLastSection . '>';
1966                         $this->mLastSection = '';
1967                 }
1968
1969                 wfProfileOut( $fname );
1970                 return $output;
1971         }
1972
1973         /**
1974          * Split up a string on ':', ignoring any occurences inside
1975          * <a>..</a> or <span>...</span>
1976          * @param string $str the string to split
1977          * @param string &$before set to everything before the ':'
1978          * @param string &$after set to everything after the ':'
1979          * return string the position of the ':', or false if none found
1980          */
1981         function findColonNoLinks($str, &$before, &$after) {
1982                 # I wonder if we should make this count all tags, not just <a>
1983                 # and <span>. That would prevent us from matching a ':' that
1984                 # comes in the middle of italics other such formatting....
1985                 # -- Wil
1986                 $fname = 'Parser::findColonNoLinks';
1987                 wfProfileIn( $fname );
1988                 $pos = 0;
1989                 do {
1990                         $colon = strpos($str, ':', $pos);
1991
1992                         if ($colon !== false) {
1993                                 $before = substr($str, 0, $colon);
1994                                 $after = substr($str, $colon + 1);
1995
1996                                 # Skip any ':' within <a> or <span> pairs
1997                                 $a = substr_count($before, '<a');
1998                                 $s = substr_count($before, '<span');
1999                                 $ca = substr_count($before, '</a>');
2000                                 $cs = substr_count($before, '</span>');
2001
2002                                 if ($a <= $ca and $s <= $cs) {
2003                                         # Tags are balanced before ':'; ok
2004                                         break;
2005                                 }
2006                                 $pos = $colon + 1;
2007                         }
2008                 } while ($colon !== false);
2009                 wfProfileOut( $fname );
2010                 return $colon;
2011         }
2012
2013         /**
2014          * Return value of a magic variable (like PAGENAME)
2015          *
2016          * @access private
2017          */
2018         function getVariableValue( $index ) {
2019                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2020
2021                 /**
2022                  * Some of these require message or data lookups and can be
2023                  * expensive to check many times.
2024                  */
2025                 static $varCache = array();
2026                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2027                         if ( isset( $varCache[$index] ) )
2028                                 return $varCache[$index];
2029
2030                 $ts = time();
2031                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2032
2033                 switch ( $index ) {
2034                         case MAG_CURRENTMONTH:
2035                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2036                         case MAG_CURRENTMONTHNAME:
2037                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2038                         case MAG_CURRENTMONTHNAMEGEN:
2039                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2040                         case MAG_CURRENTMONTHABBREV:
2041                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2042                         case MAG_CURRENTDAY:
2043                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2044                         case MAG_CURRENTDAY2:
2045                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2046                         case MAG_PAGENAME:
2047                                 return $this->mTitle->getText();
2048                         case MAG_PAGENAMEE:
2049                                 return $this->mTitle->getPartialURL();
2050                         case MAG_FULLPAGENAME:
2051                                 return $this->mTitle->getPrefixedText();
2052                         case MAG_FULLPAGENAMEE:
2053                                 return $this->mTitle->getPrefixedURL();
2054                         case MAG_SUBPAGENAME:
2055                                 return $this->mTitle->getSubpageText();
2056                         case MAG_REVISIONID:
2057                                 return $this->mRevisionId;
2058                         case MAG_NAMESPACE:
2059                                 return $wgContLang->getNsText( $this->mTitle->getNamespace() );
2060                         case MAG_NAMESPACEE:
2061                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2062                         case MAG_CURRENTDAYNAME:
2063                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2064                         case MAG_CURRENTYEAR:
2065                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2066                         case MAG_CURRENTTIME:
2067                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2068                         case MAG_CURRENTWEEK:
2069                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2070                                 // int to remove the padding
2071                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2072                         case MAG_CURRENTDOW:
2073                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2074                         case MAG_NUMBEROFARTICLES:
2075                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2076                         case MAG_NUMBEROFFILES:
2077                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2078                         case MAG_SITENAME:
2079                                 return $wgSitename;
2080                         case MAG_SERVER:
2081                                 return $wgServer;
2082                         case MAG_SERVERNAME:
2083                                 return $wgServerName;
2084                         case MAG_SCRIPTPATH:
2085                                 return $wgScriptPath;
2086                         default:
2087                                 $ret = null;
2088                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2089                                         return $ret;
2090                                 else
2091                                         return null;
2092                 }
2093         }
2094
2095         /**
2096          * initialise the magic variables (like CURRENTMONTHNAME)
2097          *
2098          * @access private
2099          */
2100         function initialiseVariables() {
2101                 $fname = 'Parser::initialiseVariables';
2102                 wfProfileIn( $fname );
2103                 global $wgVariableIDs;
2104                 $this->mVariables = array();
2105                 foreach ( $wgVariableIDs as $id ) {
2106                         $mw =& MagicWord::get( $id );
2107                         $mw->addToArray( $this->mVariables, $id );
2108                 }
2109                 wfProfileOut( $fname );
2110         }
2111
2112         /**
2113          * parse any parentheses in format ((title|part|part))
2114          * and call callbacks to get a replacement text for any found piece
2115          *
2116          * @param string $text The text to parse
2117          * @param array $callbacks rules in form:
2118          *     '{' => array(                            # opening parentheses
2119          *                                      'end' => '}',   # closing parentheses
2120          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2121          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2122          *                                                                )
2123          *                                      )
2124          * @access private
2125          */
2126         function replace_callback ($text, $callbacks) {
2127                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2128                 $lastOpeningBrace = -1;                 # last not closed parentheses
2129
2130                 for ($i = 0; $i < strlen($text); $i++) {
2131                         # check for any opening brace
2132                         $rule = null;
2133                         $nextPos = -1;
2134                         foreach ($callbacks as $key => $value) {
2135                                 $pos = strpos ($text, $key, $i);
2136                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2137                                         $rule = $value;
2138                                         $nextPos = $pos;
2139                                 }
2140                         }
2141
2142                         if ($lastOpeningBrace >= 0) {
2143                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2144
2145                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2146                                         $rule = null;
2147                                         $nextPos = $pos;
2148                                 }
2149
2150                                 $pos = strpos ($text, '|', $i);
2151
2152                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2153                                         $rule = null;
2154                                         $nextPos = $pos;
2155                                 }
2156                         }
2157
2158                         if ($nextPos == -1)
2159                                 break;
2160
2161                         $i = $nextPos;
2162
2163                         # found openning brace, lets add it to parentheses stack
2164                         if (null != $rule) {
2165                                 $piece = array('brace' => $text[$i],
2166                                                            'braceEnd' => $rule['end'],
2167                                                            'count' => 1,
2168                                                            'title' => '',
2169                                                            'parts' => null);
2170
2171                                 # count openning brace characters
2172                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2173                                         $piece['count']++;
2174                                         $i++;
2175                                 }
2176
2177                                 $piece['startAt'] = $i+1;
2178                                 $piece['partStart'] = $i+1;
2179
2180                                 # we need to add to stack only if openning brace count is enough for any given rule
2181                                 foreach ($rule['cb'] as $cnt => $fn) {
2182                                         if ($piece['count'] >= $cnt) {
2183                                                 $lastOpeningBrace ++;
2184                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2185                                                 break;
2186                                         }
2187                                 }
2188
2189                                 continue;
2190                         }
2191                         else if ($lastOpeningBrace >= 0) {
2192                                 # first check if it is a closing brace
2193                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2194                                         # lets check if it is enough characters for closing brace
2195                                         $count = 1;
2196                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2197                                                 $count++;
2198
2199                                         # if there are more closing parentheses than opening ones, we parse less
2200                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2201                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2202
2203                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2204                                         $matchingCount = 0;
2205                                         $matchingCallback = null;
2206                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2207                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2208                                                         $matchingCount = $cnt;
2209                                                         $matchingCallback = $fn;
2210                                                 }
2211                                         }
2212
2213                                         if ($matchingCount == 0) {
2214                                                 $i += $count - 1;
2215                                                 continue;
2216                                         }
2217
2218                                         # lets set a title or last part (if '|' was found)
2219                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2220                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2221                                         else
2222                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2223
2224                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2225                                         $pieceEnd = $i + $matchingCount;
2226
2227                                         if( is_callable( $matchingCallback ) ) {
2228                                                 $cbArgs = array (
2229                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2230                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2231                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2232                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2233                                                                                  );
2234                                                 # finally we can call a user callback and replace piece of text
2235                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2236                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2237                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2238                                         }
2239                                         else {
2240                                                 # null value for callback means that parentheses should be parsed, but not replaced
2241                                                 $i += $matchingCount - 1;
2242                                         }
2243
2244                                         # reset last openning parentheses, but keep it in case there are unused characters
2245                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2246                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2247                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2248                                                                    'title' => '',
2249                                                                    'parts' => null,
2250                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2251                                         $openingBraceStack[$lastOpeningBrace--] = null;
2252
2253                                         if ($matchingCount < $piece['count']) {
2254                                                 $piece['count'] -= $matchingCount;
2255                                                 $piece['startAt'] -= $matchingCount;
2256                                                 $piece['partStart'] = $piece['startAt'];
2257                                                 # do we still qualify for any callback with remaining count?
2258                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2259                                                         if ($piece['count'] >= $cnt) {
2260                                                                 $lastOpeningBrace ++;
2261                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2262                                                                 break;
2263                                                         }
2264                                                 }
2265                                         }
2266                                         continue;
2267                                 }
2268
2269                                 # lets set a title if it is a first separator, or next part otherwise
2270                                 if ($text[$i] == '|') {
2271                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2272                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2273                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2274                                         }
2275                                         else
2276                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2277
2278                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2279                                 }
2280                         }
2281                 }
2282
2283                 return $text;
2284         }
2285
2286         /**
2287          * Replace magic variables, templates, and template arguments
2288          * with the appropriate text. Templates are substituted recursively,
2289          * taking care to avoid infinite loops.
2290          *
2291          * Note that the substitution depends on value of $mOutputType:
2292          *  OT_WIKI: only {{subst:}} templates
2293          *  OT_MSG: only magic variables
2294          *  OT_HTML: all templates and magic variables
2295          *
2296          * @param string $tex The text to transform
2297          * @param array $args Key-value pairs representing template parameters to substitute
2298          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2299          * @access private
2300          */
2301         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2302                 # Prevent too big inclusions
2303                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2304                         return $text;
2305                 }
2306
2307                 $fname = 'Parser::replaceVariables';
2308                 wfProfileIn( $fname );
2309
2310                 # This function is called recursively. To keep track of arguments we need a stack:
2311                 array_push( $this->mArgStack, $args );
2312
2313                 $braceCallbacks = array();
2314                 if ( !$argsOnly ) {
2315                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2316                 }
2317                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2318                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2319                 }
2320                 $callbacks = array();
2321                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2322                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2323                 $text = $this->replace_callback ($text, $callbacks);
2324
2325                 array_pop( $this->mArgStack );
2326
2327                 wfProfileOut( $fname );
2328                 return $text;
2329         }
2330
2331         /**
2332          * Replace magic variables
2333          * @access private
2334          */
2335         function variableSubstitution( $matches ) {
2336                 $fname = 'Parser::variableSubstitution';
2337                 $varname = $matches[1];
2338                 wfProfileIn( $fname );
2339                 if ( !$this->mVariables ) {
2340                         $this->initialiseVariables();
2341                 }
2342                 $skip = false;
2343                 if ( $this->mOutputType == OT_WIKI ) {
2344                         # Do only magic variables prefixed by SUBST
2345                         $mwSubst =& MagicWord::get( MAG_SUBST );
2346                         if (!$mwSubst->matchStartAndRemove( $varname ))
2347                                 $skip = true;
2348                         # Note that if we don't substitute the variable below,
2349                         # we don't remove the {{subst:}} magic word, in case
2350                         # it is a template rather than a magic variable.
2351                 }
2352                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2353                         $id = $this->mVariables[$varname];
2354                         $text = $this->getVariableValue( $id );
2355                         $this->mOutput->mContainsOldMagic = true;
2356                 } else {
2357                         $text = $matches[0];
2358                 }
2359                 wfProfileOut( $fname );
2360                 return $text;
2361         }
2362
2363         # Split template arguments
2364         function getTemplateArgs( $argsString ) {
2365                 if ( $argsString === '' ) {
2366                         return array();
2367                 }
2368
2369                 $args = explode( '|', substr( $argsString, 1 ) );
2370
2371                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2372                 # merged with the next arg because the '|' character between belongs
2373                 # to the link syntax and not the template parameter syntax.
2374                 $argc = count($args);
2375
2376                 for ( $i = 0; $i < $argc-1; $i++ ) {
2377                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2378                                 $args[$i] .= '|'.$args[$i+1];
2379                                 array_splice($args, $i+1, 1);
2380                                 $i--;
2381                                 $argc--;
2382                         }
2383                 }
2384
2385                 return $args;
2386         }
2387
2388         /**
2389          * Return the text of a template, after recursively
2390          * replacing any variables or templates within the template.
2391          *
2392          * @param array $piece The parts of the template
2393          *  $piece['text']: matched text
2394          *  $piece['title']: the title, i.e. the part before the |
2395          *  $piece['parts']: the parameter array
2396          * @return string the text of the template
2397          * @access private
2398          */
2399         function braceSubstitution( $piece ) {
2400                 global $wgContLang;
2401                 $fname = 'Parser::braceSubstitution';
2402                 wfProfileIn( $fname );
2403
2404                 # Flags
2405                 $found = false;             # $text has been filled
2406                 $nowiki = false;            # wiki markup in $text should be escaped
2407                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2408                 $noargs = false;            # Don't replace triple-brace arguments in $text
2409                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2410                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2411                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2412
2413                 # Title object, where $text came from
2414                 $title = NULL;
2415
2416                 $linestart = '';
2417
2418                 # $part1 is the bit before the first |, and must contain only title characters
2419                 # $args is a list of arguments, starting from index 0, not including $part1
2420
2421                 $part1 = $piece['title'];
2422                 # If the third subpattern matched anything, it will start with |
2423
2424                 if (null == $piece['parts']) {
2425                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2426                         if ($replaceWith != $piece['text']) {
2427                                 $text = $replaceWith;
2428                                 $found = true;
2429                                 $noparse = true;
2430                                 $noargs = true;
2431                         }
2432                 }
2433
2434                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2435                 $argc = count( $args );
2436
2437                 # SUBST
2438                 if ( !$found ) {
2439                         $mwSubst =& MagicWord::get( MAG_SUBST );
2440                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2441                                 # One of two possibilities is true:
2442                                 # 1) Found SUBST but not in the PST phase
2443                                 # 2) Didn't find SUBST and in the PST phase
2444                                 # In either case, return without further processing
2445                                 $text = $piece['text'];
2446                                 $found = true;
2447                                 $noparse = true;
2448                                 $noargs = true;
2449                         }
2450                 }
2451
2452                 # MSG, MSGNW, INT and RAW
2453                 if ( !$found ) {
2454                         # Check for MSGNW:
2455                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2456                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2457                                 $nowiki = true;
2458                         } else {
2459                                 # Remove obsolete MSG:
2460                                 $mwMsg =& MagicWord::get( MAG_MSG );
2461                                 $mwMsg->matchStartAndRemove( $part1 );
2462                         }
2463
2464                         # Check for RAW:
2465                         $mwRaw =& MagicWord::get( MAG_RAW );
2466                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2467                                 $forceRawInterwiki = true;
2468                         }
2469
2470                         # Check if it is an internal message
2471                         $mwInt =& MagicWord::get( MAG_INT );
2472                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2473                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2474                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2475                                         $found = true;
2476                                 }
2477                         }
2478                 }
2479
2480                 # NS
2481                 if ( !$found ) {
2482                         # Check for NS: (namespace expansion)
2483                         $mwNs = MagicWord::get( MAG_NS );
2484                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2485                                 if ( intval( $part1 ) || $part1 == "0" ) {
2486                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2487                                         $found = true;
2488                                 } else {
2489                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2490                                         if ( !is_null( $index ) ) {
2491                                                 $text = $linestart . $wgContLang->getNsText( $index );
2492                                                 $found = true;
2493                                         }
2494                                 }
2495                         }
2496                 }
2497
2498                 # LCFIRST, UCFIRST, LC and UC
2499                 if ( !$found ) {
2500                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2501                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2502                         $lc =& MagicWord::get( MAG_LC );
2503                         $uc =& MagicWord::get( MAG_UC );
2504                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2505                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2506                                 $found = true;
2507                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2508                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2509                                 $found = true;
2510                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2511                                 $text = $linestart . $wgContLang->lc( $part1 );
2512                                 $found = true;
2513                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2514                                  $text = $linestart . $wgContLang->uc( $part1 );
2515                                  $found = true;
2516                         }
2517                 }
2518
2519                 # LOCALURL and FULLURL
2520                 if ( !$found ) {
2521                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2522                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2523                         $mwFull =& MagicWord::get( MAG_FULLURL );
2524                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2525
2526
2527                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2528                                 $func = 'getLocalURL';
2529                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2530                                 $func = 'escapeLocalURL';
2531                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2532                                 $func = 'getFullURL';
2533                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2534                                 $func = 'escapeFullURL';
2535                         } else {
2536                                 $func = false;
2537                         }
2538
2539                         if ( $func !== false ) {
2540                                 $title = Title::newFromText( $part1 );
2541                                 if ( !is_null( $title ) ) {
2542                                         if ( $argc > 0 ) {
2543                                                 $text = $linestart . $title->$func( $args[0] );
2544                                         } else {
2545                                                 $text = $linestart . $title->$func();
2546                                         }
2547                                         $found = true;
2548                                 }
2549                         }
2550                 }
2551
2552                 # GRAMMAR
2553                 if ( !$found && $argc == 1 ) {
2554                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2555                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2556                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2557                                 $found = true;
2558                         }
2559                 }
2560
2561                 # PLURAL
2562                 if ( !$found && $argc >= 2 ) {
2563                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2564                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2565                                 if ($argc==2) {$args[2]=$args[1];}
2566                                 $text = $linestart . $wgContLang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2567                                 $found = true;
2568                         }
2569                 }
2570
2571                 # Template table test
2572
2573                 # Did we encounter this template already? If yes, it is in the cache
2574                 # and we need to check for loops.
2575                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2576                         $found = true;
2577
2578                         # Infinite loop test
2579                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2580                                 $noparse = true;
2581                                 $noargs = true;
2582                                 $found = true;
2583                                 $text = $linestart .
2584                                         '{{' . $part1 . '}}' .
2585                                         '<!-- WARNING: template loop detected -->';
2586                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2587                         } else {
2588                                 # set $text to cached message.
2589                                 $text = $linestart . $this->mTemplates[$piece['title']];
2590                         }
2591                 }
2592
2593                 # Load from database
2594                 $lastPathLevel = $this->mTemplatePath;
2595                 if ( !$found ) {
2596                         $ns = NS_TEMPLATE;
2597                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage='' );
2598                         if ($subpage !== '') {
2599                                 $ns = $this->mTitle->getNamespace();
2600                         }
2601                         $title = Title::newFromText( $part1, $ns );
2602
2603                         if ( !is_null( $title ) ) {
2604                                 if ( !$title->isExternal() ) {
2605                                         # Check for excessive inclusion
2606                                         $dbk = $title->getPrefixedDBkey();
2607                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2608                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() ) {
2609                                                         # Capture special page output
2610                                                         $text = SpecialPage::capturePath( $title );
2611                                                         if ( is_string( $text ) ) {
2612                                                                 $found = true;
2613                                                                 $noparse = true;
2614                                                                 $noargs = true;
2615                                                                 $isHTML = true;
2616                                                                 $this->disableCache();
2617                                                         }
2618                                                 } else {
2619                                                         $articleContent = $this->fetchTemplate( $title );
2620                                                         if ( $articleContent !== false ) {
2621                                                                 $found = true;
2622                                                                 $text = $articleContent;
2623                                                                 $replaceHeadings = true;
2624                                                         }
2625                                                 }
2626                                         }
2627
2628                                         # If the title is valid but undisplayable, make a link to it
2629                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2630                                                 $text = '[['.$title->getPrefixedText().']]';
2631                                                 $found = true;
2632                                         }
2633                                 } elseif ( $title->isTrans() ) {
2634                                         // Interwiki transclusion
2635                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2636                                                 $text = $this->interwikiTransclude( $title, 'render' );
2637                                                 $isHTML = true;
2638                                                 $noparse = true;
2639                                         } else {
2640                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2641                                                 $replaceHeadings = true;
2642                                         }
2643                                         $found = true;
2644                                 }
2645
2646                                 # Template cache array insertion
2647                                 # Use the original $piece['title'] not the mangled $part1, so that
2648                                 # modifiers such as RAW: produce separate cache entries
2649                                 if( $found ) {
2650                                         $this->mTemplates[$piece['title']] = $text;
2651                                         $text = $linestart . $text;
2652                                 }
2653                         }
2654                 }
2655
2656                 # Recursive parsing, escaping and link table handling
2657                 # Only for HTML output
2658                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2659                         $text = wfEscapeWikiText( $text );
2660                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2661                         if ( !$noargs ) {
2662                                 # Clean up argument array
2663                                 $assocArgs = array();
2664                                 $index = 1;
2665                                 foreach( $args as $arg ) {
2666                                         $eqpos = strpos( $arg, '=' );
2667                                         if ( $eqpos === false ) {
2668                                                 $assocArgs[$index++] = $arg;
2669                                         } else {
2670                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2671                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2672                                                 if ( $value === false ) {
2673                                                         $value = '';
2674                                                 }
2675                                                 if ( $name !== false ) {
2676                                                         $assocArgs[$name] = $value;
2677                                                 }
2678                                         }
2679                                 }
2680
2681                                 # Add a new element to the templace recursion path
2682                                 $this->mTemplatePath[$part1] = 1;
2683                         }
2684
2685                         if ( !$noparse ) {
2686                                 # If there are any <onlyinclude> tags, only include them
2687                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2688                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2689                                         $text = '';
2690                                         foreach ($m[1] as $piece)
2691                                                 $text .= $piece;
2692                                 }
2693                                 # Remove <noinclude> sections and <includeonly> tags
2694                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2695                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2696
2697                                 if( $this->mOutputType == OT_HTML ) {
2698                                         # Strip <nowiki>, <pre>, etc.
2699                                         $text = $this->strip( $text, $this->mStripState );
2700                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2701                                 }
2702                                 $text = $this->replaceVariables( $text, $assocArgs );
2703
2704                                 # If the template begins with a table or block-level
2705                                 # element, it should be treated as beginning a new line.
2706                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2707                                         $text = "\n" . $text;
2708                                 }
2709                         } elseif ( !$noargs ) {
2710                                 # $noparse and !$noargs
2711                                 # Just replace the arguments, not any double-brace items
2712                                 # This is used for rendered interwiki transclusion
2713                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2714                         }
2715                 }
2716                 # Prune lower levels off the recursion check path
2717                 $this->mTemplatePath = $lastPathLevel;
2718
2719                 if ( !$found ) {
2720                         wfProfileOut( $fname );
2721                         return $piece['text'];
2722                 } else {
2723                         if ( $isHTML ) {
2724                                 # Replace raw HTML by a placeholder
2725                                 # Add a blank line preceding, to prevent it from mucking up
2726                                 # immediately preceding headings
2727                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2728                         } else {
2729                                 # replace ==section headers==
2730                                 # XXX this needs to go away once we have a better parser.
2731                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2732                                         if( !is_null( $title ) )
2733                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2734                                         else
2735                                                 $encodedname = base64_encode("");
2736                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2737                                                 PREG_SPLIT_DELIM_CAPTURE);
2738                                         $text = '';
2739                                         $nsec = 0;
2740                                         for( $i = 0; $i < count($m); $i += 2 ) {
2741                                                 $text .= $m[$i];
2742                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2743                                                 $hl = $m[$i + 1];
2744                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2745                                                         $text .= $hl;
2746                                                         continue;
2747                                                 }
2748                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2749                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2750                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2751
2752                                                 $nsec++;
2753                                         }
2754                                 }
2755                         }
2756                 }
2757
2758                 # Prune lower levels off the recursion check path
2759                 $this->mTemplatePath = $lastPathLevel;
2760
2761                 if ( !$found ) {
2762                         wfProfileOut( $fname );
2763                         return $piece['text'];
2764                 } else {
2765                         wfProfileOut( $fname );
2766                         return $text;
2767                 }
2768         }
2769
2770         /**
2771          * Fetch the unparsed text of a template and register a reference to it.
2772          */
2773         function fetchTemplate( $title ) {
2774                 $text = false;
2775                 // Loop to fetch the article, with up to 1 redirect
2776                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
2777                         $rev = Revision::newFromTitle( $title );
2778                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
2779                         if ( !$rev ) {
2780                                 break;
2781                         }
2782                         $text = $rev->getText();
2783                         if ( $text === false ) {
2784                                 break;
2785                         }
2786                         // Redirect?
2787                         $title = Title::newFromRedirect( $text );
2788                 }
2789                 return $text;
2790         }
2791
2792         /**
2793          * Transclude an interwiki link.
2794          */
2795         function interwikiTransclude( $title, $action ) {
2796                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
2797
2798                 if (!$wgEnableScaryTranscluding)
2799                         return wfMsg('scarytranscludedisabled');
2800
2801                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
2802                 // But we'll handle it generally anyway
2803                 if ( $title->getNamespace() ) {
2804                         // Use the canonical namespace, which should work anywhere
2805                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
2806                 } else {
2807                         $articleName = $title->getDBkey();
2808                 }
2809
2810                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
2811                 $url .= "?action=$action";
2812                 if (strlen($url) > 255)
2813                         return wfMsg('scarytranscludetoolong');
2814                 return $this->fetchScaryTemplateMaybeFromCache($url);
2815         }
2816
2817         function fetchScaryTemplateMaybeFromCache($url) {
2818                 global $wgTranscludeCacheExpiry;
2819                 $dbr =& wfGetDB(DB_SLAVE);
2820                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2821                                 array('tc_url' => $url));
2822                 if ($obj) {
2823                         $time = $obj->tc_time;
2824                         $text = $obj->tc_contents;
2825                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
2826                                 return $text;
2827                         }
2828                 }
2829
2830                 $text = wfGetHTTP($url);
2831                 if (!$text)
2832                         return wfMsg('scarytranscludefailed', $url);
2833
2834                 $dbw =& wfGetDB(DB_MASTER);
2835                 $dbw->replace('transcache', array('tc_url'), array(
2836                         'tc_url' => $url,
2837                         'tc_time' => time(),
2838                         'tc_contents' => $text));
2839                 return $text;
2840         }
2841
2842
2843         /**
2844          * Triple brace replacement -- used for template arguments
2845          * @access private
2846          */
2847         function argSubstitution( $matches ) {
2848                 $arg = trim( $matches['title'] );
2849                 $text = $matches['text'];
2850                 $inputArgs = end( $this->mArgStack );
2851
2852                 if ( array_key_exists( $arg, $inputArgs ) ) {
2853                         $text = $inputArgs[$arg];
2854                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
2855                         $text = $matches['parts'][0];
2856                 }
2857
2858                 return $text;
2859         }
2860
2861         /**
2862          * Returns true if the function is allowed to include this entity
2863          * @access private
2864          */
2865         function incrementIncludeCount( $dbk ) {
2866                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2867                         $this->mIncludeCount[$dbk] = 0;
2868                 }
2869                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2870                         return true;
2871                 } else {
2872                         return false;
2873                 }
2874         }
2875
2876         /**
2877          * This function accomplishes several tasks:
2878          * 1) Auto-number headings if that option is enabled
2879          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2880          * 3) Add a Table of contents on the top for users who have enabled the option
2881          * 4) Auto-anchor headings
2882          *
2883          * It loops through all headlines, collects the necessary data, then splits up the
2884          * string and re-inserts the newly formatted headlines.
2885          *
2886          * @param string $text
2887          * @param boolean $isMain
2888          * @access private
2889          */
2890         function formatHeadings( $text, $isMain=true ) {
2891                 global $wgMaxTocLevel, $wgContLang;
2892
2893                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2894                 $doShowToc = true;
2895                 $forceTocHere = false;
2896                 if( !$this->mTitle->userCanEdit() ) {
2897                         $showEditLink = 0;
2898                 } else {
2899                         $showEditLink = $this->mOptions->getEditSection();
2900                 }
2901
2902                 # Inhibit editsection links if requested in the page
2903                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2904                 if( $esw->matchAndRemove( $text ) ) {
2905                         $showEditLink = 0;
2906                 }
2907                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
2908                 # do not add TOC
2909                 $mw =& MagicWord::get( MAG_NOTOC );
2910                 if( $mw->matchAndRemove( $text ) ) {
2911                         $doShowToc = false;
2912                 }
2913
2914                 # Get all headlines for numbering them and adding funky stuff like [edit]
2915                 # links - this is for later, but we need the number of headlines right now
2916                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
2917
2918                 # if there are fewer than 4 headlines in the article, do not show TOC
2919                 if( $numMatches < 4 ) {
2920                         $doShowToc = false;
2921                 }
2922
2923                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
2924                 # override above conditions and always show TOC at that place
2925
2926                 $mw =& MagicWord::get( MAG_TOC );
2927                 if($mw->match( $text ) ) {
2928                         $doShowToc = true;
2929                         $forceTocHere = true;
2930                 } else {
2931                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
2932                         # override above conditions and always show TOC above first header
2933                         $mw =& MagicWord::get( MAG_FORCETOC );
2934                         if ($mw->matchAndRemove( $text ) ) {
2935                                 $doShowToc = true;
2936                         }
2937                 }
2938
2939                 # Never ever show TOC if no headers
2940                 if( $numMatches < 1 ) {
2941                         $doShowToc = false;
2942                 }
2943
2944                 # We need this to perform operations on the HTML
2945                 $sk =& $this->mOptions->getSkin();
2946
2947                 # headline counter
2948                 $headlineCount = 0;
2949                 $sectionCount = 0; # headlineCount excluding template sections
2950
2951                 # Ugh .. the TOC should have neat indentation levels which can be
2952                 # passed to the skin functions. These are determined here
2953                 $toc = '';
2954                 $full = '';
2955                 $head = array();
2956                 $sublevelCount = array();
2957                 $levelCount = array();
2958                 $toclevel = 0;
2959                 $level = 0;
2960                 $prevlevel = 0;
2961                 $toclevel = 0;
2962                 $prevtoclevel = 0;
2963
2964                 foreach( $matches[3] as $headline ) {
2965                         $istemplate = 0;
2966                         $templatetitle = '';
2967                         $templatesection = 0;
2968                         $numbering = '';
2969
2970                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
2971                                 $istemplate = 1;
2972                                 $templatetitle = base64_decode($mat[1]);
2973                                 $templatesection = 1 + (int)base64_decode($mat[2]);
2974                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
2975                         }
2976
2977                         if( $toclevel ) {
2978                                 $prevlevel = $level;
2979                                 $prevtoclevel = $toclevel;
2980                         }
2981                         $level = $matches[1][$headlineCount];
2982
2983                         if( $doNumberHeadings || $doShowToc ) {
2984
2985                                 if ( $level > $prevlevel ) {
2986                                         # Increase TOC level
2987                                         $toclevel++;
2988                                         $sublevelCount[$toclevel] = 0;
2989                                         $toc .= $sk->tocIndent();
2990                                 }
2991                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
2992                                         # Decrease TOC level, find level to jump to
2993
2994                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
2995                                                 # Can only go down to level 1
2996                                                 $toclevel = 1;
2997                                         } else {
2998                                                 for ($i = $toclevel; $i > 0; $i--) {
2999                                                         if ( $levelCount[$i] == $level ) {
3000                                                                 # Found last matching level
3001                                                                 $toclevel = $i;
3002                                                                 break;
3003                                                         }
3004                                                         elseif ( $levelCount[$i] < $level ) {
3005                                                                 # Found first matching level below current level
3006                                                                 $toclevel = $i + 1;
3007                                                                 break;
3008                                                         }
3009                                                 }
3010                                         }
3011
3012                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3013                                 }
3014                                 else {
3015                                         # No change in level, end TOC line
3016                                         $toc .= $sk->tocLineEnd();
3017                                 }
3018
3019                                 $levelCount[$toclevel] = $level;
3020
3021                                 # count number of headlines for each level
3022                                 @$sublevelCount[$toclevel]++;
3023                                 $dot = 0;
3024                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3025                                         if( !empty( $sublevelCount[$i] ) ) {
3026                                                 if( $dot ) {
3027                                                         $numbering .= '.';
3028                                                 }
3029                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3030                                                 $dot = 1;
3031                                         }
3032                                 }
3033                         }
3034
3035                         # The canonized header is a version of the header text safe to use for links
3036                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3037                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3038                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3039
3040                         # Remove link placeholders by the link text.
3041                         #     <!--LINK number-->
3042                         # turns into
3043                         #     link text with suffix
3044                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3045                                                             "\$this->mLinkHolders['texts'][\$1]",
3046                                                             $canonized_headline );
3047                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3048                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3049                                                             $canonized_headline );
3050
3051                         # strip out HTML
3052                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3053                         $tocline = trim( $canonized_headline );
3054                         # Save headline for section edit hint before it's escaped
3055                         $headline_hint = trim( $canonized_headline );
3056                         $canonized_headline = Sanitizer::escapeId( $tocline );
3057                         $refers[$headlineCount] = $canonized_headline;
3058
3059                         # count how many in assoc. array so we can track dupes in anchors
3060                         @$refers[$canonized_headline]++;
3061                         $refcount[$headlineCount]=$refers[$canonized_headline];
3062
3063                         # Don't number the heading if it is the only one (looks silly)
3064                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3065                                 # the two are different if the line contains a link
3066                                 $headline=$numbering . ' ' . $headline;
3067                         }
3068
3069                         # Create the anchor for linking from the TOC to the section
3070                         $anchor = $canonized_headline;
3071                         if($refcount[$headlineCount] > 1 ) {
3072                                 $anchor .= '_' . $refcount[$headlineCount];
3073                         }
3074                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3075                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3076                         }
3077                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3078                                 if ( empty( $head[$headlineCount] ) ) {
3079                                         $head[$headlineCount] = '';
3080                                 }
3081                                 if( $istemplate )
3082                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3083                                 else
3084                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3085                         }
3086
3087                         # give headline the correct <h#> tag
3088                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3089
3090                         $headlineCount++;
3091                         if( !$istemplate )
3092                                 $sectionCount++;
3093                 }
3094
3095                 if( $doShowToc ) {
3096                         $toc .= $sk->tocUnindent( $toclevel - 1 );
3097                         $toc = $sk->tocList( $toc );
3098                 }
3099
3100                 # split up and insert constructed headlines
3101
3102                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3103                 $i = 0;
3104
3105                 foreach( $blocks as $block ) {
3106                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3107                                 # This is the [edit] link that appears for the top block of text when
3108                                 # section editing is enabled
3109
3110                                 # Disabled because it broke block formatting
3111                                 # For example, a bullet point in the top line
3112                                 # $full .= $sk->editSectionLink(0);
3113                         }
3114                         $full .= $block;
3115                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
3116                         # Top anchor now in skin
3117                                 $full = $full.$toc;
3118                         }
3119
3120                         if( !empty( $head[$i] ) ) {
3121                                 $full .= $head[$i];
3122                         }
3123                         $i++;
3124                 }
3125                 if($forceTocHere) {
3126                         $mw =& MagicWord::get( MAG_TOC );
3127                         return $mw->replace( $toc, $full );
3128                 } else {
3129                         return $full;
3130                 }
3131         }
3132
3133         /**
3134          * Return an HTML link for the "ISBN 123456" text
3135          * @access private
3136          */
3137         function magicISBN( $text ) {
3138                 $fname = 'Parser::magicISBN';
3139                 wfProfileIn( $fname );
3140
3141                 $a = split( 'ISBN ', ' '.$text );
3142                 if ( count ( $a ) < 2 ) {
3143                         wfProfileOut( $fname );
3144                         return $text;
3145                 }
3146                 $text = substr( array_shift( $a ), 1);
3147                 $valid = '0123456789-Xx';
3148
3149                 foreach ( $a as $x ) {
3150                         $isbn = $blank = '' ;
3151                         while ( ' ' == $x{0} ) {
3152                                 $blank .= ' ';
3153                                 $x = substr( $x, 1 );
3154                         }
3155                         if ( $x == '' ) { # blank isbn
3156                                 $text .= "ISBN $blank";
3157                                 continue;
3158                         }
3159                         while ( strstr( $valid, $x{0} ) != false ) {
3160                                 $isbn .= $x{0};
3161                                 $x = substr( $x, 1 );
3162                         }
3163                         $num = str_replace( '-', '', $isbn );
3164                         $num = str_replace( ' ', '', $num );
3165                         $num = str_replace( 'x', 'X', $num );
3166
3167                         if ( '' == $num ) {
3168                                 $text .= "ISBN $blank$x";
3169                         } else {
3170                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3171                                 $text .= '<a href="' .
3172                                 $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3173                                         "\" class=\"internal\">ISBN $isbn</a>";
3174                                 $text .= $x;
3175                         }
3176                 }
3177                 wfProfileOut( $fname );
3178                 return $text;
3179         }
3180
3181         /**
3182          * Return an HTML link for the "RFC 1234" text
3183          *
3184          * @access private
3185          * @param string $text     Text to be processed
3186          * @param string $keyword  Magic keyword to use (default RFC)
3187          * @param string $urlmsg   Interface message to use (default rfcurl)
3188          * @return string
3189          */
3190         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3191
3192                 $valid = '0123456789';
3193                 $internal = false;
3194
3195                 $a = split( $keyword, ' '.$text );
3196                 if ( count ( $a ) < 2 ) {
3197                         return $text;
3198                 }
3199                 $text = substr( array_shift( $a ), 1);
3200
3201                 /* Check if keyword is preceed by [[.
3202                  * This test is made here cause of the array_shift above
3203                  * that prevent the test to be done in the foreach.
3204                  */
3205                 if ( substr( $text, -2 ) == '[[' ) {
3206                         $internal = true;
3207                 }
3208
3209                 foreach ( $a as $x ) {
3210                         /* token might be empty if we have RFC RFC 1234 */
3211                         if ( $x=='' ) {
3212                                 $text.=$keyword;
3213                                 continue;
3214                                 }
3215
3216                         $id = $blank = '' ;
3217
3218                         /** remove and save whitespaces in $blank */
3219                         while ( $x{0} == ' ' ) {
3220                                 $blank .= ' ';
3221                                 $x = substr( $x, 1 );
3222                         }
3223
3224                         /** remove and save the rfc number in $id */
3225                         while ( strstr( $valid, $x{0} ) != false ) {
3226                                 $id .= $x{0};
3227                                 $x = substr( $x, 1 );
3228                         }
3229
3230                         if ( $id == '' ) {
3231                                 /* call back stripped spaces*/
3232                                 $text .= $keyword.$blank.$x;
3233                         } elseif( $internal ) {
3234                                 /* normal link */
3235                                 $text .= $keyword.$id.$x;
3236                         } else {
3237                                 /* build the external link*/
3238                                 $url = wfMsg( $urlmsg, $id);
3239                                 $sk =& $this->mOptions->getSkin();
3240                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3241                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3242                         }
3243
3244                         /* Check if the next RFC keyword is preceed by [[ */
3245                         $internal = ( substr($x,-2) == '[[' );
3246                 }
3247                 return $text;
3248         }
3249
3250         /**
3251          * Transform wiki markup when saving a page by doing \r\n -> \n
3252          * conversion, substitting signatures, {{subst:}} templates, etc.
3253          *
3254          * @param string $text the text to transform
3255          * @param Title &$title the Title object for the current article
3256          * @param User &$user the User object describing the current user
3257          * @param ParserOptions $options parsing options
3258          * @param bool $clearState whether to clear the parser state first
3259          * @return string the altered wiki markup
3260          * @access public
3261          */
3262         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3263                 $this->mOptions = $options;
3264                 $this->mTitle =& $title;
3265                 $this->mOutputType = OT_WIKI;
3266
3267                 if ( $clearState ) {
3268                         $this->clearState();
3269                 }
3270
3271                 $stripState = false;
3272                 $pairs = array(
3273                         "\r\n" => "\n",
3274                 );
3275                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3276                 $text = $this->strip( $text, $stripState, true );
3277                 $text = $this->pstPass2( $text, $user );
3278                 $text = $this->unstrip( $text, $stripState );
3279                 $text = $this->unstripNoWiki( $text, $stripState );
3280                 return $text;
3281         }
3282
3283         /**
3284          * Pre-save transform helper function
3285          * @access private
3286          */
3287         function pstPass2( $text, &$user ) {
3288                 global $wgContLang, $wgLocaltimezone;
3289
3290                 /* Note: This is the timestamp saved as hardcoded wikitext to
3291                  * the database, we use $wgContLang here in order to give
3292                  * everyone the same signiture and use the default one rather
3293                  * than the one selected in each users preferences.
3294                  */
3295                 if ( isset( $wgLocaltimezone ) ) {
3296                         $oldtz = getenv( 'TZ' );
3297                         putenv( 'TZ='.$wgLocaltimezone );
3298                 }
3299                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3300                   ' (' . date( 'T' ) . ')';
3301                 if ( isset( $wgLocaltimezone ) ) {
3302                         putenv( 'TZ='.$oldtz );
3303                 }
3304
3305                 # Variable replacement
3306                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3307                 $text = $this->replaceVariables( $text );
3308
3309                 # Signatures
3310                 $sigText = $this->getUserSig( $user );
3311                 $text = strtr( $text, array(
3312                         '~~~~~' => $d,
3313                         '~~~~' => "$sigText $d",
3314                         '~~~' => $sigText
3315                 ) );
3316
3317                 # Context links: [[|name]] and [[name (context)|]]
3318                 #
3319                 global $wgLegalTitleChars;
3320                 $tc = "[$wgLegalTitleChars]";
3321                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3322
3323                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3324                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3325
3326                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3327                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3328                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3329                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3330                 $context = '';
3331                 $t = $this->mTitle->getText();
3332                 if ( preg_match( $conpat, $t, $m ) ) {
3333                         $context = $m[2];
3334                 }
3335                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3336                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3337                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3338
3339                 if ( '' == $context ) {
3340                         $text = preg_replace( $p2, '[[\\1]]', $text );
3341                 } else {
3342                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3343                 }
3344
3345                 # Trim trailing whitespace
3346                 # MAG_END (__END__) tag allows for trailing
3347                 # whitespace to be deliberately included
3348                 $text = rtrim( $text );
3349                 $mw =& MagicWord::get( MAG_END );
3350                 $mw->matchAndRemove( $text );
3351
3352                 return $text;
3353         }
3354
3355         /**
3356          * Fetch the user's signature text, if any, and normalize to
3357          * validated, ready-to-insert wikitext.
3358          *
3359          * @param User $user
3360          * @return string
3361          * @access private
3362          */
3363         function getUserSig( &$user ) {
3364                 $username = $user->getName();
3365                 $nickname = $user->getOption( 'nickname' );
3366                 $nickname = $nickname === '' ? $username : $nickname;
3367
3368                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3369                         # Sig. might contain markup; validate this
3370                         if( $this->validateSig( $nickname ) !== false ) {
3371                                 # Validated; clean up (if needed) and return it
3372                                 return( $this->cleanSig( $nickname ) );
3373                         } else {
3374                                 # Failed to validate; fall back to the default
3375                                 $nickname = $username;
3376                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3377                         }
3378                 }
3379
3380                 # If we're still here, make it a link to the user page
3381                 $userpage = $user->getUserPage();
3382                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3383         }
3384
3385         /**
3386          * Check that the user's signature contains no bad XML
3387          *
3388          * @param string $text
3389          * @return mixed An expanded string, or false if invalid.
3390          */
3391         function validateSig( $text ) {
3392                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3393         }
3394
3395         /**
3396          * Clean up signature text
3397          *
3398          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3399          * 2) Substitute all transclusions
3400          *
3401          * @param string $text
3402          * @return string Signature text
3403          */
3404         function cleanSig( $text ) {
3405                 $substWord = MagicWord::get( MAG_SUBST );
3406                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3407                 $substText = '{{' . $substWord->getSynonym( 0 );
3408
3409                 $text = preg_replace( $substRegex, $substText, $text );
3410                 $text = preg_replace( '/~{3,5}/', '', $text );
3411                 $text = $this->replaceVariables( $text );
3412
3413                 return $text;
3414         }
3415
3416         /**
3417          * Set up some variables which are usually set up in parse()
3418          * so that an external function can call some class members with confidence
3419          * @access public
3420          */
3421         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3422                 $this->mTitle =& $title;
3423                 $this->mOptions = $options;
3424                 $this->mOutputType = $outputType;
3425                 if ( $clearState ) {
3426                         $this->clearState();
3427                 }
3428         }
3429
3430         /**
3431          * Transform a MediaWiki message by replacing magic variables.
3432          *
3433          * @param string $text the text to transform
3434          * @param ParserOptions $options  options
3435          * @return string the text with variables substituted
3436          * @access public
3437          */
3438         function transformMsg( $text, $options ) {
3439                 global $wgTitle;
3440                 static $executing = false;
3441
3442                 $fname = "Parser::transformMsg";
3443
3444                 # Guard against infinite recursion
3445                 if ( $executing ) {
3446                         return $text;
3447                 }
3448                 $executing = true;
3449
3450                 wfProfileIn($fname);
3451
3452                 $this->mTitle = $wgTitle;
3453                 $this->mOptions = $options;
3454                 $this->mOutputType = OT_MSG;
3455                 $this->clearState();
3456                 $text = $this->replaceVariables( $text );
3457
3458                 $executing = false;
3459                 wfProfileOut($fname);
3460                 return $text;
3461         }
3462
3463         /**
3464          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3465          * The callback should have the following form:
3466          *    function myParserHook( $text, $params, &$parser ) { ... }
3467          *
3468          * Transform and return $text. Use $parser for any required context, e.g. use
3469          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3470          *
3471          * @access public
3472          *
3473          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3474          * @param mixed $callback The callback function (and object) to use for the tag
3475          *
3476          * @return The old value of the mTagHooks array associated with the hook
3477          */
3478         function setHook( $tag, $callback ) {
3479                 $oldVal = @$this->mTagHooks[$tag];
3480                 $this->mTagHooks[$tag] = $callback;
3481
3482                 return $oldVal;
3483         }
3484
3485         /**
3486          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3487          * Placeholders created in Skin::makeLinkObj()
3488          * Returns an array of links found, indexed by PDBK:
3489          *  0 - broken
3490          *  1 - normal link
3491          *  2 - stub
3492          * $options is a bit field, RLH_FOR_UPDATE to select for update
3493          */
3494         function replaceLinkHolders( &$text, $options = 0 ) {
3495                 global $wgUser;
3496                 global $wgOutputReplace;
3497
3498                 $fname = 'Parser::replaceLinkHolders';
3499                 wfProfileIn( $fname );
3500
3501                 $pdbks = array();
3502                 $colours = array();
3503                 $sk =& $this->mOptions->getSkin();
3504                 $linkCache =& LinkCache::singleton();
3505
3506                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3507                         wfProfileIn( $fname.'-check' );
3508                         $dbr =& wfGetDB( DB_SLAVE );
3509                         $page = $dbr->tableName( 'page' );
3510                         $threshold = $wgUser->getOption('stubthreshold');
3511
3512                         # Sort by namespace
3513                         asort( $this->mLinkHolders['namespaces'] );
3514
3515                         # Generate query
3516                         $query = false;
3517                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3518                                 # Make title object
3519                                 $title = $this->mLinkHolders['titles'][$key];
3520
3521                                 # Skip invalid entries.
3522                                 # Result will be ugly, but prevents crash.
3523                                 if ( is_null( $title ) ) {
3524                                         continue;
3525                                 }
3526                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3527
3528                                 # Check if it's a static known link, e.g. interwiki
3529                                 if ( $title->isAlwaysKnown() ) {
3530                                         $colours[$pdbk] = 1;
3531                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3532                                         $colours[$pdbk] = 1;
3533                                         $this->mOutput->addLink( $title, $id );
3534                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3535                                         $colours[$pdbk] = 0;
3536                                 } else {
3537                                         # Not in the link cache, add it to the query
3538                                         if ( !isset( $current ) ) {
3539                                                 $current = $ns;
3540                                                 $query =  "SELECT page_id, page_namespace, page_title";
3541                                                 if ( $threshold > 0 ) {
3542                                                         $query .= ', page_len, page_is_redirect';
3543                                                 }
3544                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3545                                         } elseif ( $current != $ns ) {
3546                                                 $current = $ns;
3547                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3548                                         } else {
3549                                                 $query .= ', ';
3550                                         }
3551
3552                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3553                                 }
3554                         }
3555                         if ( $query ) {
3556                                 $query .= '))';
3557                                 if ( $options & RLH_FOR_UPDATE ) {
3558                                         $query .= ' FOR UPDATE';
3559                                 }
3560
3561                                 $res = $dbr->query( $query, $fname );
3562
3563                                 # Fetch data and form into an associative array
3564                                 # non-existent = broken
3565                                 # 1 = known
3566                                 # 2 = stub
3567                                 while ( $s = $dbr->fetchObject($res) ) {
3568                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3569                                         $pdbk = $title->getPrefixedDBkey();
3570                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3571                                         $this->mOutput->addLink( $title, $s->page_id );
3572
3573                                         if ( $threshold >  0 ) {
3574                                                 $size = $s->page_len;
3575                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3576                                                         $colours[$pdbk] = 1;
3577                                                 } else {
3578                                                         $colours[$pdbk] = 2;
3579                                                 }
3580                                         } else {
3581                                                 $colours[$pdbk] = 1;
3582                                         }
3583                                 }
3584                         }
3585                         wfProfileOut( $fname.'-check' );
3586
3587                         # Construct search and replace arrays
3588                         wfProfileIn( $fname.'-construct' );
3589                         $wgOutputReplace = array();
3590                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3591                                 $pdbk = $pdbks[$key];
3592                                 $searchkey = "<!--LINK $key-->";
3593                                 $title = $this->mLinkHolders['titles'][$key];
3594                                 if ( empty( $colours[$pdbk] ) ) {
3595                                         $linkCache->addBadLinkObj( $title );
3596                                         $colours[$pdbk] = 0;
3597                                         $this->mOutput->addLink( $title, 0 );
3598                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3599                                                                         $this->mLinkHolders['texts'][$key],
3600                                                                         $this->mLinkHolders['queries'][$key] );
3601                                 } elseif ( $colours[$pdbk] == 1 ) {
3602                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3603                                                                         $this->mLinkHolders['texts'][$key],
3604                                                                         $this->mLinkHolders['queries'][$key] );
3605                                 } elseif ( $colours[$pdbk] == 2 ) {
3606                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3607                                                                         $this->mLinkHolders['texts'][$key],
3608                                                                         $this->mLinkHolders['queries'][$key] );
3609                                 }
3610                         }
3611                         wfProfileOut( $fname.'-construct' );
3612
3613                         # Do the thing
3614                         wfProfileIn( $fname.'-replace' );
3615
3616                         $text = preg_replace_callback(
3617                                 '/(<!--LINK .*?-->)/',
3618                                 "wfOutputReplaceMatches",
3619                                 $text);
3620
3621                         wfProfileOut( $fname.'-replace' );
3622                 }
3623
3624                 # Now process interwiki link holders
3625                 # This is quite a bit simpler than internal links
3626                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3627                         wfProfileIn( $fname.'-interwiki' );
3628                         # Make interwiki link HTML
3629                         $wgOutputReplace = array();
3630                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3631                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3632                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3633                         }
3634
3635                         $text = preg_replace_callback(
3636                                 '/<!--IWLINK (.*?)-->/',
3637                                 "wfOutputReplaceMatches",
3638                                 $text );
3639                         wfProfileOut( $fname.'-interwiki' );
3640                 }
3641
3642                 wfProfileOut( $fname );
3643                 return $colours;
3644         }
3645
3646         /**
3647          * Replace <!--LINK--> link placeholders with plain text of links
3648          * (not HTML-formatted).
3649          * @param string $text
3650          * @return string
3651          */
3652         function replaceLinkHoldersText( $text ) {
3653                 $fname = 'Parser::replaceLinkHoldersText';
3654                 wfProfileIn( $fname );
3655
3656                 $text = preg_replace_callback(
3657                         '/<!--(LINK|IWLINK) (.*?)-->/',
3658                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3659                         $text );
3660
3661                 wfProfileOut( $fname );
3662                 return $text;
3663         }
3664
3665         /**
3666          * @param array $matches
3667          * @return string
3668          * @access private
3669          */
3670         function replaceLinkHoldersTextCallback( $matches ) {
3671                 $type = $matches[1];
3672                 $key  = $matches[2];
3673                 if( $type == 'LINK' ) {
3674                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3675                                 return $this->mLinkHolders['texts'][$key];
3676                         }
3677                 } elseif( $type == 'IWLINK' ) {
3678                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3679                                 return $this->mInterwikiLinkHolders['texts'][$key];
3680                         }
3681                 }
3682                 return $matches[0];
3683         }
3684
3685         /**
3686          * Renders an image gallery from a text with one line per image.
3687          * text labels may be given by using |-style alternative text. E.g.
3688          *   Image:one.jpg|The number "1"
3689          *   Image:tree.jpg|A tree
3690          * given as text will return the HTML of a gallery with two images,
3691          * labeled 'The number "1"' and
3692          * 'A tree'.
3693          */
3694         function renderImageGallery( $text ) {
3695                 # Setup the parser
3696                 $parserOptions = new ParserOptions;
3697                 $localParser = new Parser();
3698
3699                 $ig = new ImageGallery();
3700                 $ig->setShowBytes( false );
3701                 $ig->setShowFilename( false );
3702                 $lines = explode( "\n", $text );
3703
3704                 foreach ( $lines as $line ) {
3705                         # match lines like these:
3706                         # Image:someimage.jpg|This is some image
3707                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3708                         # Skip empty lines
3709                         if ( count( $matches ) == 0 ) {
3710                                 continue;
3711                         }
3712                         $nt =& Title::newFromText( $matches[1] );
3713                         if( is_null( $nt ) ) {
3714                                 # Bogus title. Ignore these so we don't bomb out later.
3715                                 continue;
3716                         }
3717                         if ( isset( $matches[3] ) ) {
3718                                 $label = $matches[3];
3719                         } else {
3720                                 $label = '';
3721                         }
3722
3723                         $pout = $localParser->parse( $label , $this->mTitle, $parserOptions );
3724                         $html = $pout->getText();
3725
3726                         $ig->add( new Image( $nt ), $html );
3727                         $this->mOutput->addImage( $nt->getDBkey() );
3728                 }
3729                 return $ig->toHTML();
3730         }
3731
3732         /**
3733          * Parse image options text and use it to make an image
3734          */
3735         function makeImage( &$nt, $options ) {
3736                 global $wgUseImageResize;
3737
3738                 $align = '';
3739
3740                 # Check if the options text is of the form "options|alt text"
3741                 # Options are:
3742                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3743                 #  * left               no resizing, just left align. label is used for alt= only
3744                 #  * right              same, but right aligned
3745                 #  * none               same, but not aligned
3746                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3747                 #  * center             center the image
3748                 #  * framed             Keep original image size, no magnify-button.
3749
3750                 $part = explode( '|', $options);
3751
3752                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3753                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3754                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3755                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3756                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3757                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3758                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3759                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3760                 $caption = '';
3761
3762                 $width = $height = $framed = $thumb = false;
3763                 $manual_thumb = '' ;
3764
3765                 foreach( $part as $key => $val ) {
3766                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3767                                 $thumb=true;
3768                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3769                                 # use manually specified thumbnail
3770                                 $thumb=true;
3771                                 $manual_thumb = $match;
3772                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3773                                 # remember to set an alignment, don't render immediately
3774                                 $align = 'right';
3775                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
3776                                 # remember to set an alignment, don't render immediately
3777                                 $align = 'left';
3778                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
3779                                 # remember to set an alignment, don't render immediately
3780                                 $align = 'center';
3781                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
3782                                 # remember to set an alignment, don't render immediately
3783                                 $align = 'none';
3784                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
3785                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
3786                                 # $match is the image width in pixels
3787                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
3788                                         $width = intval( $m[1] );
3789                                         $height = intval( $m[2] );
3790                                 } else {
3791                                         $width = intval($match);
3792                                 }
3793                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
3794                                 $framed=true;
3795                         } else {
3796                                 $caption = $val;
3797                         }
3798                 }
3799                 # Strip bad stuff out of the alt text
3800                 $alt = $this->replaceLinkHoldersText( $caption );
3801                 $alt = Sanitizer::stripAllTags( $alt );
3802
3803                 # Linker does the rest
3804                 $sk =& $this->mOptions->getSkin();
3805                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
3806         }
3807
3808         /**
3809          * Set a flag in the output object indicating that the content is dynamic and
3810          * shouldn't be cached.
3811          */
3812         function disableCache() {
3813                 $this->mOutput->mCacheTime = -1;
3814         }
3815
3816         /**#@+
3817          * Callback from the Sanitizer for expanding items found in HTML attribute
3818          * values, so they can be safely tested and escaped.
3819          * @param string $text
3820          * @param array $args
3821          * @return string
3822          * @access private
3823          */
3824         function attributeStripCallback( &$text, $args ) {
3825                 $text = $this->replaceVariables( $text, $args );
3826                 $text = $this->unstripForHTML( $text );
3827                 return $text;
3828         }
3829
3830         function unstripForHTML( $text ) {
3831                 $text = $this->unstrip( $text, $this->mStripState );
3832                 $text = $this->unstripNoWiki( $text, $this->mStripState );
3833                 return $text;
3834         }
3835         /**#@-*/
3836
3837         /**#@+
3838          * Accessor/mutator
3839          */
3840         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
3841         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
3842         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
3843         /**#@-*/
3844
3845         /**#@+
3846          * Accessor
3847          */
3848         function getTags() { return array_keys( $this->mTagHooks ); }
3849         /**#@-*/
3850 }
3851
3852 /**
3853  * @todo document
3854  * @package MediaWiki
3855  */
3856 class ParserOutput
3857 {
3858         var $mText,             # The output text
3859                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
3860                 $mCategories,       # Map of category names to sort keys
3861                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
3862                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
3863                 $mVersion,          # Compatibility check
3864                 $mTitleText,        # title text of the chosen language variant
3865                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
3866                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
3867                 $mImages,           # DB keys of the images used, in the array key only
3868                 $mExternalLinks;    # External link URLs, in the key only
3869
3870         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
3871                 $containsOldMagic = false, $titletext = '' )
3872         {
3873                 $this->mText = $text;
3874                 $this->mLanguageLinks = $languageLinks;
3875                 $this->mCategories = $categoryLinks;
3876                 $this->mContainsOldMagic = $containsOldMagic;
3877                 $this->mCacheTime = '';
3878                 $this->mVersion = MW_PARSER_VERSION;
3879                 $this->mTitleText = $titletext;
3880                 $this->mLinks = array();
3881                 $this->mTemplates = array();
3882                 $this->mImages = array();
3883                 $this->mExternalLinks = array();
3884         }
3885
3886         function getText()                   { return $this->mText; }
3887         function getLanguageLinks()          { return $this->mLanguageLinks; }
3888         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
3889         function &getCategories()            { return $this->mCategories; }
3890         function getCacheTime()              { return $this->mCacheTime; }
3891         function getTitleText()              { return $this->mTitleText; }
3892         function &getLinks()                 { return $this->mLinks; }
3893         function &getTemplates()             { return $this->mTemplates; }
3894         function &getImages()                { return $this->mImages; }
3895         function &getExternalLinks()         { return $this->mExternalLinks; }
3896
3897         function containsOldMagic()          { return $this->mContainsOldMagic; }
3898         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
3899         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
3900         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
3901         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
3902         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
3903         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
3904
3905         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
3906         function addImage( $name )           { $this->mImages[$name] = 1; }
3907         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
3908         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
3909
3910         function addLink( $title, $id ) {
3911                 $ns = $title->getNamespace();
3912                 $dbk = $title->getDBkey();
3913                 if ( !isset( $this->mLinks[$ns] ) ) {
3914                         $this->mLinks[$ns] = array();
3915                 }
3916                 $this->mLinks[$ns][$dbk] = $id;
3917         }
3918
3919         function addTemplate( $title, $id ) {
3920                 $ns = $title->getNamespace();
3921                 $dbk = $title->getDBkey();
3922                 if ( !isset( $this->mTemplates[$ns] ) ) {
3923                         $this->mTemplates[$ns] = array();
3924                 }
3925                 $this->mTemplates[$ns][$dbk] = $id;
3926         }
3927
3928         /**
3929          * @deprecated
3930          */
3931         /*
3932         function merge( $other ) {
3933                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $other->mLanguageLinks );
3934                 $this->mCategories = array_merge( $this->mCategories, $this->mLanguageLinks );
3935                 $this->mContainsOldMagic = $this->mContainsOldMagic || $other->mContainsOldMagic;
3936         }*/
3937
3938         /**
3939          * Return true if this cached output object predates the global or
3940          * per-article cache invalidation timestamps, or if it comes from
3941          * an incompatible older version.
3942          *
3943          * @param string $touched the affected article's last touched timestamp
3944          * @return bool
3945          * @access public
3946          */
3947         function expired( $touched ) {
3948                 global $wgCacheEpoch;
3949                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
3950                        $this->getCacheTime() < $touched ||
3951                        $this->getCacheTime() <= $wgCacheEpoch ||
3952                        !isset( $this->mVersion ) ||
3953                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
3954         }
3955 }
3956
3957 /**
3958  * Set options of the Parser
3959  * @todo document
3960  * @package MediaWiki
3961  */
3962 class ParserOptions
3963 {
3964         # All variables are private
3965         var $mUseTeX;                    # Use texvc to expand <math> tags
3966         var $mUseDynamicDates;           # Use DateFormatter to format dates
3967         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
3968         var $mAllowExternalImages;       # Allow external images inline
3969         var $mAllowExternalImagesFrom;   # If not, any exception?
3970         var $mSkin;                      # Reference to the preferred skin
3971         var $mDateFormat;                # Date format index
3972         var $mEditSection;               # Create "edit section" links
3973         var $mNumberHeadings;            # Automatically number headings
3974         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
3975         var $mTidy;                      # Ask for tidy cleanup
3976
3977         function getUseTeX()                        { return $this->mUseTeX; }
3978         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
3979         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
3980         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
3981         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
3982         function &getSkin()                         { return $this->mSkin; }
3983         function getDateFormat()                    { return $this->mDateFormat; }
3984         function getEditSection()                   { return $this->mEditSection; }
3985         function getNumberHeadings()                { return $this->mNumberHeadings; }
3986         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
3987         function getTidy()                          { return $this->mTidy; }
3988
3989         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
3990         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
3991         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
3992         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
3993         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
3994         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
3995         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
3996         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
3997         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
3998         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
3999         function setSkin( &$x ) { $this->mSkin =& $x; }
4000
4001         function ParserOptions() {
4002                 global $wgUser;
4003                 $this->initialiseFromUser( $wgUser );
4004         }
4005
4006         /**
4007          * Get parser options
4008          * @static
4009          */
4010         function newFromUser( &$user ) {
4011                 $popts = new ParserOptions;
4012                 $popts->initialiseFromUser( $user );
4013                 return $popts;
4014         }
4015
4016         /** Get user options */
4017         function initialiseFromUser( &$userInput ) {
4018                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4019                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4020                 $fname = 'ParserOptions::initialiseFromUser';
4021                 wfProfileIn( $fname );
4022                 if ( !$userInput ) {
4023                         $user = new User;
4024                         $user->setLoaded( true );
4025                 } else {
4026                         $user =& $userInput;
4027                 }
4028
4029                 $this->mUseTeX = $wgUseTeX;
4030                 $this->mUseDynamicDates = $wgUseDynamicDates;
4031                 $this->mInterwikiMagic = $wgInterwikiMagic;
4032                 $this->mAllowExternalImages = $wgAllowExternalImages;
4033                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4034                 wfProfileIn( $fname.'-skin' );
4035                 $this->mSkin =& $user->getSkin();
4036                 wfProfileOut( $fname.'-skin' );
4037                 $this->mDateFormat = $user->getOption( 'date' );
4038                 $this->mEditSection = true;
4039                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4040                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4041                 $this->mTidy = false;
4042                 wfProfileOut( $fname );
4043         }
4044 }
4045
4046 /**
4047  * Callback function used by Parser::replaceLinkHolders()
4048  * to substitute link placeholders.
4049  */
4050 function &wfOutputReplaceMatches( $matches ) {
4051         global $wgOutputReplace;
4052         return $wgOutputReplace[$matches[1]];
4053 }
4054
4055 /**
4056  * Return the total number of articles
4057  */
4058 function wfNumberOfArticles() {
4059         global $wgNumberOfArticles;
4060
4061         wfLoadSiteStats();
4062         return $wgNumberOfArticles;
4063 }
4064
4065 /**
4066  * Return the number of files
4067  */
4068 function wfNumberOfFiles() {
4069         $fname = 'Parser::wfNumberOfFiles';
4070
4071         wfProfileIn( $fname );
4072         $dbr =& wfGetDB( DB_SLAVE );
4073         $res = $dbr->selectField('image', 'COUNT(*)', array(), $fname );
4074         wfProfileOut( $fname );
4075
4076         return $res;
4077 }
4078
4079 /**
4080  * Get various statistics from the database
4081  * @access private
4082  */
4083 function wfLoadSiteStats() {
4084         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4085         $fname = 'wfLoadSiteStats';
4086
4087         if ( -1 != $wgNumberOfArticles ) return;
4088         $dbr =& wfGetDB( DB_SLAVE );
4089         $s = $dbr->selectRow( 'site_stats',
4090                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4091                 array( 'ss_row_id' => 1 ), $fname
4092         );
4093
4094         if ( $s === false ) {
4095                 return;
4096         } else {
4097                 $wgTotalViews = $s->ss_total_views;
4098                 $wgTotalEdits = $s->ss_total_edits;
4099                 $wgNumberOfArticles = $s->ss_good_articles;
4100         }
4101 }
4102
4103 /**
4104  * Escape html tags
4105  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4106  *
4107  * @param string $in Text that might contain HTML tags
4108  * @return string Escaped string
4109  */
4110 function wfEscapeHTMLTagsOnly( $in ) {
4111         return str_replace(
4112                 array( '"', '>', '<' ),
4113                 array( '&quot;', '&gt;', '&lt;' ),
4114                 $in );
4115 }
4116
4117 ?>