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', '1.6.1' );
  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          * @private
  94          */
  95         # Persistent:
  96         private $mTagHooks, $mFunctionHooks;
  97
  98         # Cleared with clearState():
  99         private
 100                 $mArgStack,
 101                 $mAutonumber,
 102                 $mDTopen,
 103                 $mIncludeCount,
 104                 $mInPre,
 105                 $mInterwikiLinkHolders,
 106                 $mLastSection,
 107                 $mLinkHolders,
 108                 $mOutput,
 109                 $mStripState = array(),
 110                 $mUniqPrefix,
 111                 $mVariables ;
 112
 113         private
 114                 $mTemplates,    // cache of already loaded templates, avoids
 115                                 // multiple SQL queries for the same string
 116             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 117                                 // in this path. Used for loop detection.
 118
 119         # Temporary
 120         # These are variables reset at least once per parse regardless of $clearState
 121         private
 122                 $mOptions,      // ParserOptions object
 123                 $mTitle,        // Title context, used for self-link rendering and similar things
 124                 $mOutputType,   // Output type, one of the OT_xxx constants
 125                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 126
 127         /**#@-*/
 128
 129         /**
 130          * Constructor
 131          *
 132          * @public
 133          */
 134         function Parser() {
 135                 $this->mTagHooks = array();
 136                 $this->mFunctionHooks = array();
 137                 $this->clearState();
 138         }
 139
 140         /**
 141          * Clear Parser state
 142          *
 143          * @private
 144          */
 145         function clearState() {
 146                 $this->mOutput = new ParserOutput;
 147                 $this->mAutonumber = 0;
 148                 $this->mLastSection = '';
 149                 $this->mDTopen = false;
 150                 $this->mVariables = false;
 151                 $this->mIncludeCount = array();
 152                 $this->mStripState = array();
 153                 $this->mArgStack = array();
 154                 $this->mInPre = false;
 155                 $this->mInterwikiLinkHolders = array(
 156                         'texts' => array(),
 157                         'titles' => array()
 158                 );
 159                 $this->mLinkHolders = array(
 160                         'namespaces' => array(),
 161                         'dbkeys' => array(),
 162                         'queries' => array(),
 163                         'texts' => array(),
 164                         'titles' => array()
 165                 );
 166                 $this->mRevisionId = null;
 167                 $this->mUniqPrefix = 'UNIQ' . Parser::getRandomString();
 168
 169                 # Clear these on every parse, bug 4549
 170                 $this->mTemplates = array();
 171                 $this->mTemplatePath = array();
 172
 173                 wfRunHooks( 'ParserClearState', array( &$this ) );
 174         }
 175
 176         /**
 177          * Accessor for mUniqPrefix.
 178          *
 179          * @public
 180          */
 181         function UniqPrefix() {
 182                 return $this->mUniqPrefix;
 183         }
 184
 185         /**
 186          * Convert wikitext to HTML
 187          * Do not call this function recursively.
 188          *
 189          * @private
 190          * @param string $text Text we want to parse
 191          * @param Title &$title A title object
 192          * @param array $options
 193          * @param boolean $linestart
 194          * @param boolean $clearState
 195          * @param int $revid number to pass in {{REVISIONID}}
 196          * @return ParserOutput a ParserOutput
 197          */
 198         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 199                 /**
 200                  * First pass--just handle <nowiki> sections, pass the rest off
 201                  * to internalParse() which does all the real work.
 202                  */
 203
 204                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 205                 $fname = 'Parser::parse';
 206                 wfProfileIn( $fname );
 207
 208                 if ( $clearState ) {
 209                         $this->clearState();
 210                 }
 211
 212                 $this->mOptions = $options;
 213                 $this->mTitle =& $title;
 214                 $this->mRevisionId = $revid;
 215                 $this->mOutputType = OT_HTML;
 216
 217                 //$text = $this->strip( $text, $this->mStripState );
 218                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 219                 $x =& $this->mStripState;
 220
 221                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 222                 $text = $this->strip( $text, $x );
 223                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 224
 225                 # Hook to suspend the parser in this state
 226                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 227                         wfProfileOut( $fname );
 228                         return $text ;
 229                 }
 230
 231                 $text = $this->internalParse( $text );
 232
 233                 $text = $this->unstrip( $text, $this->mStripState );
 234
 235                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 236                 $fixtags = array(
 237                         # french spaces, last one Guillemet-left
 238                         # only if there is something before the space
 239                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 240                         # french spaces, Guillemet-right
 241                         '/(\\302\\253) /' => '\\1&nbsp;',
 242                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 243                 );
 244                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 245
 246                 # only once and last
 247                 $text = $this->doBlockLevels( $text, $linestart );
 248
 249                 $this->replaceLinkHolders( $text );
 250
 251                 # the position of the parserConvert() call should not be changed. it
 252                 # assumes that the links are all replaced and the only thing left
 253                 # is the <nowiki> mark.
 254                 # Side-effects: this calls $this->mOutput->setTitleText()
 255                 $text = $wgContLang->parserConvert( $text, $this );
 256
 257                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 258
 259                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 260
 261                 $text = Sanitizer::normalizeCharReferences( $text );
 262
 263                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 264                         $text = Parser::tidy($text);
 265                 } else {
 266                         # attempt to sanitize at least some nesting problems
 267                         # (bug #2702 and quite a few others)
 268                         $tidyregs = array(
 269                                 # ''Something [http://www.cool.com cool''] -->
 270                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 271                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 272                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 273                                 # fix up an anchor inside another anchor, only
 274                                 # at least for a single single nested link (bug 3695)
 275                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 276                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 277                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 278                                 # contains a div, so fix it up here; replace
 279                                 # div with escaped text
 280                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 281                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 282                                 # remove empty italic or bold tag pairs, some
 283                                 # introduced by rules above
 284                                 '/<([bi])><\/\\1>/' => ''
 285                         );
 286
 287                         $text = preg_replace(
 288                                 array_keys( $tidyregs ),
 289                                 array_values( $tidyregs ),
 290                                 $text );
 291                 }
 292
 293                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 294
 295                 $this->mOutput->setText( $text );
 296                 wfProfileOut( $fname );
 297
 298                 return $this->mOutput;
 299         }
 300
 301         /**
 302          * Get a random string
 303          *
 304          * @private
 305          * @static
 306          */
 307         function getRandomString() {
 308                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 309         }
 310
 311         function &getTitle() { return $this->mTitle; }
 312         function getOptions() { return $this->mOptions; }
 313
 314         /**
 315          * Replaces all occurrences of <$tag>content</$tag> in the text
 316          * with a random marker and returns the new text. the output parameter
 317          * $content will be an associative array filled with data on the form
 318          * $unique_marker => content.
 319          *
 320          * If $content is already set, the additional entries will be appended
 321          * If $tag is set to STRIP_COMMENTS, the function will extract
 322          * <!-- HTML comments -->
 323          *
 324          * @private
 325          * @static
 326          */
 327         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 328                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 329                 if ( !$content ) {
 330                         $content = array( );
 331                 }
 332                 $n = 1;
 333                 $stripped = '';
 334
 335                 if ( !$tags ) {
 336                         $tags = array( );
 337                 }
 338
 339                 if ( !$params ) {
 340                         $params = array( );
 341                 }
 342
 343                 if( $tag == STRIP_COMMENTS ) {
 344                         $start = '/<!--()/';
 345                         $end   = '/-->/';
 346                 } else {
 347                         $start = "/<$tag(\\s+[^>]*|\\s*\/?)>/i";
 348                         $end   = "/<\\/$tag\\s*>/i";
 349                 }
 350
 351                 while ( '' != $text ) {
 352                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 353                         $stripped .= $p[0];
 354                         if( count( $p ) < 3 ) {
 355                                 break;
 356                         }
 357                         $attributes = $p[1];
 358                         $inside     = $p[2];
 359
 360                         // If $attributes ends with '/', we have an empty element tag, <tag />
 361                         if( $tag != STRIP_COMMENTS && substr( $attributes, -1 ) == '/' ) {
 362                                 $attributes = substr( $attributes, 0, -1);
 363                                 $empty = '/';
 364                         } else {
 365                                 $empty = '';
 366                         }
 367
 368                         $marker = $rnd . sprintf('%08X', $n++);
 369                         $stripped .= $marker;
 370
 371                         $tags[$marker] = "<$tag$attributes$empty>";
 372                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 373
 374                         if ( $empty === '/' ) {
 375                                 // Empty element tag, <tag />
 376                                 $content[$marker] = null;
 377                                 $text = $inside;
 378                         } else {
 379                                 $q = preg_split( $end, $inside, 2 );
 380                                 $content[$marker] = $q[0];
 381                                 if( count( $q ) < 2 ) {
 382                                         # No end tag -- let it run out to the end of the text.
 383                                         break;
 384                                 } else {
 385                                         $text = $q[1];
 386                                 }
 387                         }
 388                 }
 389                 return $stripped;
 390         }
 391
 392         /**
 393          * Wrapper function for extractTagsAndParams
 394          * for cases where $tags and $params isn't needed
 395          * i.e. where tags will never have params, like <nowiki>
 396          *
 397          * @private
 398          * @static
 399          */
 400         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 401                 $dummy_tags = array();
 402                 $dummy_params = array();
 403
 404                 return Parser::extractTagsAndParams( $tag, $text, $content,
 405                         $dummy_tags, $dummy_params, $uniq_prefix );
 406         }
 407
 408         /**
 409          * Strips and renders nowiki, pre, math, hiero
 410          * If $render is set, performs necessary rendering operations on plugins
 411          * Returns the text, and fills an array with data needed in unstrip()
 412          * If the $state is already a valid strip state, it adds to the state
 413          *
 414          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 415          *  will be stripped in addition to other tags. This is important
 416          *  for section editing, where these comments cause confusion when
 417          *  counting the sections in the wikisource
 418          *
 419          * @private
 420          */
 421         function strip( $text, &$state, $stripcomments = false ) {
 422                 $render = ($this->mOutputType == OT_HTML);
 423                 $html_content = array();
 424                 $nowiki_content = array();
 425                 $math_content = array();
 426                 $pre_content = array();
 427                 $comment_content = array();
 428                 $ext_content = array();
 429                 $ext_tags = array();
 430                 $ext_params = array();
 431                 $gallery_content = array();
 432
 433                 # Replace any instances of the placeholders
 434                 $uniq_prefix = $this->mUniqPrefix;
 435                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 436
 437                 # html
 438                 global $wgRawHtml;
 439                 if( $wgRawHtml ) {
 440                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 441                         foreach( $html_content as $marker => $content ) {
 442                                 if ($render ) {
 443                                         # Raw and unchecked for validity.
 444                                         $html_content[$marker] = $content;
 445                                 } else {
 446                                         $html_content[$marker] = '<html>'.$content.'</html>';
 447                                 }
 448                         }
 449                 }
 450
 451                 # nowiki
 452                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 453                 foreach( $nowiki_content as $marker => $content ) {
 454                         if( $render ){
 455                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 456                         } else {
 457                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 458                         }
 459                 }
 460
 461                 # math
 462                 if( $this->mOptions->getUseTeX() ) {
 463                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 464                         foreach( $math_content as $marker => $content ){
 465                                 if( $render ) {
 466                                         $math_content[$marker] = renderMath( $content );
 467                                 } else {
 468                                         $math_content[$marker] = '<math>'.$content.'</math>';
 469                                 }
 470                         }
 471                 }
 472
 473                 # pre
 474                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 475                 foreach( $pre_content as $marker => $content ){
 476                         if( $render ){
 477                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 478                         } else {
 479                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 480                         }
 481                 }
 482
 483                 # gallery
 484                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 485                 foreach( $gallery_content as $marker => $content ) {
 486                         require_once( 'ImageGallery.php' );
 487                         if ( $render ) {
 488                                 $gallery_content[$marker] = $this->renderImageGallery( $content );
 489                         } else {
 490                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 491                         }
 492                 }
 493
 494                 # Comments
 495                 $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 496                 foreach( $comment_content as $marker => $content ){
 497                         $comment_content[$marker] = '<!--'.$content.'-->';
 498                 }
 499
 500                 # Extensions
 501                 foreach ( $this->mTagHooks as $tag => $callback ) {
 502                         $ext_content[$tag] = array();
 503                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 504                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 505                         foreach( $ext_content[$tag] as $marker => $content ) {
 506                                 $full_tag = $ext_tags[$tag][$marker];
 507                                 $params = $ext_params[$tag][$marker];
 508                                 if ( $render )
 509                                         $ext_content[$tag][$marker] = call_user_func_array( $callback, array( $content, $params, &$this ) );
 510                                 else {
 511                                         if ( is_null( $content ) ) {
 512                                                 // Empty element tag
 513                                                 $ext_content[$tag][$marker] = $full_tag;
 514                                         } else {
 515                                                 $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 516                                         }
 517                                 }
 518                         }
 519                 }
 520
 521                 # Unstrip comments unless explicitly told otherwise.
 522                 # (The comments are always stripped prior to this point, so as to
 523                 # not invoke any extension tags / parser hooks contained within
 524                 # a comment.)
 525                 if ( !$stripcomments ) {
 526                         $tempstate = array( 'comment' => $comment_content );
 527                         $text = $this->unstrip( $text, $tempstate );
 528                         $comment_content = array();
 529                 }
 530
 531                 # Merge state with the pre-existing state, if there is one
 532                 if ( $state ) {
 533                         $state['html'] = $state['html'] + $html_content;
 534                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 535                         $state['math'] = $state['math'] + $math_content;
 536                         $state['pre'] = $state['pre'] + $pre_content;
 537                         $state['gallery'] = $state['gallery'] + $gallery_content;
 538                         $state['comment'] = $state['comment'] + $comment_content;
 539
 540                         foreach( $ext_content as $tag => $array ) {
 541                                 if ( array_key_exists( $tag, $state ) ) {
 542                                         $state[$tag] = $state[$tag] + $array;
 543                                 }
 544                         }
 545                 } else {
 546                         $state = array(
 547                           'html' => $html_content,
 548                           'nowiki' => $nowiki_content,
 549                           'math' => $math_content,
 550                           'pre' => $pre_content,
 551                           'gallery' => $gallery_content,
 552                           'comment' => $comment_content,
 553                         ) + $ext_content;
 554                 }
 555                 return $text;
 556         }
 557
 558         /**
 559          * restores pre, math, and hiero removed by strip()
 560          *
 561          * always call unstripNoWiki() after this one
 562          * @private
 563          */
 564         function unstrip( $text, &$state ) {
 565                 if ( !is_array( $state ) ) {
 566                         return $text;
 567                 }
 568
 569                 # Must expand in reverse order, otherwise nested tags will be corrupted
 570                 foreach( array_reverse( $state, true ) as $tag => $contentDict ) {
 571                         if( $tag != 'nowiki' && $tag != 'html' ) {
 572                                 foreach( array_reverse( $contentDict, true ) as $uniq => $content ) {
 573                                         $text = str_replace( $uniq, $content, $text );
 574                                 }
 575                         }
 576                 }
 577
 578                 return $text;
 579         }
 580
 581         /**
 582          * always call this after unstrip() to preserve the order
 583          *
 584          * @private
 585          */
 586         function unstripNoWiki( $text, &$state ) {
 587                 if ( !is_array( $state ) ) {
 588                         return $text;
 589                 }
 590
 591                 # Must expand in reverse order, otherwise nested tags will be corrupted
 592                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 593                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 594                 }
 595
 596                 global $wgRawHtml;
 597                 if ($wgRawHtml) {
 598                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 599                                 $text = str_replace( key( $state['html'] ), $content, $text );
 600                         }
 601                 }
 602
 603                 return $text;
 604         }
 605
 606         /**
 607          * Add an item to the strip state
 608          * Returns the unique tag which must be inserted into the stripped text
 609          * The tag will be replaced with the original text in unstrip()
 610          *
 611          * @private
 612          */
 613         function insertStripItem( $text, &$state ) {
 614                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 615                 if ( !$state ) {
 616                         $state = array(
 617                           'html' => array(),
 618                           'nowiki' => array(),
 619                           'math' => array(),
 620                           'pre' => array(),
 621                           'comment' => array(),
 622                           'gallery' => array(),
 623                         );
 624                 }
 625                 $state['item'][$rnd] = $text;
 626                 return $rnd;
 627         }
 628
 629         /**
 630          * Interface with html tidy, used if $wgUseTidy = true.
 631          * If tidy isn't able to correct the markup, the original will be
 632          * returned in all its glory with a warning comment appended.
 633          *
 634          * Either the external tidy program or the in-process tidy extension
 635          * will be used depending on availability. Override the default
 636          * $wgTidyInternal setting to disable the internal if it's not working.
 637          *
 638          * @param string $text Hideous HTML input
 639          * @return string Corrected HTML output
 640          * @public
 641          * @static
 642          */
 643         function tidy( $text ) {
 644                 global $wgTidyInternal;
 645                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 646 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 647 '<head><title>test</title></head><body>'.$text.'</body></html>';
 648                 if( $wgTidyInternal ) {
 649                         $correctedtext = Parser::internalTidy( $wrappedtext );
 650                 } else {
 651                         $correctedtext = Parser::externalTidy( $wrappedtext );
 652                 }
 653                 if( is_null( $correctedtext ) ) {
 654                         wfDebug( "Tidy error detected!\n" );
 655                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 656                 }
 657                 return $correctedtext;
 658         }
 659
 660         /**
 661          * Spawn an external HTML tidy process and get corrected markup back from it.
 662          *
 663          * @private
 664          * @static
 665          */
 666         function externalTidy( $text ) {
 667                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 668                 $fname = 'Parser::externalTidy';
 669                 wfProfileIn( $fname );
 670
 671                 $cleansource = '';
 672                 $opts = ' -utf8';
 673
 674                 $descriptorspec = array(
 675                         0 => array('pipe', 'r'),
 676                         1 => array('pipe', 'w'),
 677                         2 => array('file', '/dev/null', 'a')
 678                 );
 679                 $pipes = array();
 680                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 681                 if (is_resource($process)) {
 682                         // Theoretically, this style of communication could cause a deadlock
 683                         // here. If the stdout buffer fills up, then writes to stdin could
 684                         // block. This doesn't appear to happen with tidy, because tidy only
 685                         // writes to stdout after it's finished reading from stdin. Search
 686                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 687                         fwrite($pipes[0], $text);
 688                         fclose($pipes[0]);
 689                         while (!feof($pipes[1])) {
 690                                 $cleansource .= fgets($pipes[1], 1024);
 691                         }
 692                         fclose($pipes[1]);
 693                         proc_close($process);
 694                 }
 695
 696                 wfProfileOut( $fname );
 697
 698                 if( $cleansource == '' && $text != '') {
 699                         // Some kind of error happened, so we couldn't get the corrected text.
 700                         // Just give up; we'll use the source text and append a warning.
 701                         return null;
 702                 } else {
 703                         return $cleansource;
 704                 }
 705         }
 706
 707         /**
 708          * Use the HTML tidy PECL extension to use the tidy library in-process,
 709          * saving the overhead of spawning a new process. Currently written to
 710          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 711          *
 712          * 'pear install tidy' should be able to compile the extension module.
 713          *
 714          * @private
 715          * @static
 716          */
 717         function internalTidy( $text ) {
 718                 global $wgTidyConf;
 719                 $fname = 'Parser::internalTidy';
 720                 wfProfileIn( $fname );
 721
 722                 tidy_load_config( $wgTidyConf );
 723                 tidy_set_encoding( 'utf8' );
 724                 tidy_parse_string( $text );
 725                 tidy_clean_repair();
 726                 if( tidy_get_status() == 2 ) {
 727                         // 2 is magic number for fatal error
 728                         // http://www.php.net/manual/en/function.tidy-get-status.php
 729                         $cleansource = null;
 730                 } else {
 731                         $cleansource = tidy_get_output();
 732                 }
 733                 wfProfileOut( $fname );
 734                 return $cleansource;
 735         }
 736
 737         /**
 738          * parse the wiki syntax used to render tables
 739          *
 740          * @private
 741          */
 742         function doTableStuff ( $t ) {
 743                 $fname = 'Parser::doTableStuff';
 744                 wfProfileIn( $fname );
 745
 746                 $t = explode ( "\n" , $t ) ;
 747                 $td = array () ; # Is currently a td tag open?
 748                 $ltd = array () ; # Was it TD or TH?
 749                 $tr = array () ; # Is currently a tr tag open?
 750                 $ltr = array () ; # tr attributes
 751                 $has_opened_tr = array(); # Did this table open a <tr> element?
 752                 $indent_level = 0; # indent level of the table
 753                 foreach ( $t AS $k => $x )
 754                 {
 755                         $x = trim ( $x ) ;
 756                         $fc = substr ( $x , 0 , 1 ) ;
 757                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 758                                 $indent_level = strlen( $matches[1] );
 759
 760                                 $attributes = $this->unstripForHTML( $matches[2] );
 761
 762                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 763                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 764                                 array_push ( $td , false ) ;
 765                                 array_push ( $ltd , '' ) ;
 766                                 array_push ( $tr , false ) ;
 767                                 array_push ( $ltr , '' ) ;
 768                                 array_push ( $has_opened_tr, false );
 769                         }
 770                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 771                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 772                                 $z = "</table>" . substr ( $x , 2);
 773                                 $l = array_pop ( $ltd ) ;
 774                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 775                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 776                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 777                                 array_pop ( $ltr ) ;
 778                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 779                         }
 780                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 781                                 $x = substr ( $x , 1 ) ;
 782                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 783                                 $z = '' ;
 784                                 $l = array_pop ( $ltd ) ;
 785                                 array_pop ( $has_opened_tr );
 786                                 array_push ( $has_opened_tr , true ) ;
 787                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 788                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 789                                 array_pop ( $ltr ) ;
 790                                 $t[$k] = $z ;
 791                                 array_push ( $tr , false ) ;
 792                                 array_push ( $td , false ) ;
 793                                 array_push ( $ltd , '' ) ;
 794                                 $attributes = $this->unstripForHTML( $x );
 795                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 796                         }
 797                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 798                                 # $x is a table row
 799                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 800                                         $fc = '+' ;
 801                                         $x = substr ( $x , 1 ) ;
 802                                 }
 803                                 $after = substr ( $x , 1 ) ;
 804                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 805
 806                                 // Split up multiple cells on the same line.
 807                                 // FIXME: This can result in improper nesting of tags processed
 808                                 // by earlier parser steps, but should avoid splitting up eg
 809                                 // attribute values containing literal "||".
 810                                 $after = wfExplodeMarkup( '||', $after );
 811
 812                                 $t[$k] = '' ;
 813
 814                                 # Loop through each table cell
 815                                 foreach ( $after AS $theline )
 816                                 {
 817                                         $z = '' ;
 818                                         if ( $fc != '+' )
 819                                         {
 820                                                 $tra = array_pop ( $ltr ) ;
 821                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 822                                                 array_push ( $tr , true ) ;
 823                                                 array_push ( $ltr , '' ) ;
 824                                                 array_pop ( $has_opened_tr );
 825                                                 array_push ( $has_opened_tr , true ) ;
 826                                         }
 827
 828                                         $l = array_pop ( $ltd ) ;
 829                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 830                                         if ( $fc == '|' ) $l = 'td' ;
 831                                         else if ( $fc == '!' ) $l = 'th' ;
 832                                         else if ( $fc == '+' ) $l = 'caption' ;
 833                                         else $l = '' ;
 834                                         array_push ( $ltd , $l ) ;
 835
 836                                         # Cell parameters
 837                                         $y = explode ( '|' , $theline , 2 ) ;
 838                                         # Note that a '|' inside an invalid link should not
 839                                         # be mistaken as delimiting cell parameters
 840                                         if ( strpos( $y[0], '[[' ) !== false ) {
 841                                                 $y = array ($theline);
 842                                         }
 843                                         if ( count ( $y ) == 1 )
 844                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 845                                         else {
 846                                                 $attributes = $this->unstripForHTML( $y[0] );
 847                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 848                                         }
 849                                         $t[$k] .= $y ;
 850                                         array_push ( $td , true ) ;
 851                                 }
 852                         }
 853                 }
 854
 855                 # Closing open td, tr && table
 856                 while ( count ( $td ) > 0 )
 857                 {
 858                         $l = array_pop ( $ltd ) ;
 859                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 860                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 861                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 862                         $t[] = '</table>' ;
 863                 }
 864
 865                 $t = implode ( "\n" , $t ) ;
 866                 # special case: don't return empty table
 867                 if($t == "<table>\n<tr><td></td></tr>\n</table>")
 868                         $t = '';
 869                 wfProfileOut( $fname );
 870                 return $t ;
 871         }
 872
 873         /**
 874          * Helper function for parse() that transforms wiki markup into
 875          * HTML. Only called for $mOutputType == OT_HTML.
 876          *
 877          * @private
 878          */
 879         function internalParse( $text ) {
 880                 $args = array();
 881                 $isMain = true;
 882                 $fname = 'Parser::internalParse';
 883                 wfProfileIn( $fname );
 884
 885                 # Remove <noinclude> tags and <includeonly> sections
 886                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 887                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 888                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 889
 890                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 891                 $text = $this->replaceVariables( $text, $args );
 892
 893                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 894
 895                 $text = $this->doHeadings( $text );
 896                 if($this->mOptions->getUseDynamicDates()) {
 897                         $df =& DateFormatter::getInstance();
 898                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 899                 }
 900                 $text = $this->doAllQuotes( $text );
 901                 $text = $this->replaceInternalLinks( $text );
 902                 $text = $this->replaceExternalLinks( $text );
 903
 904                 # replaceInternalLinks may sometimes leave behind
 905                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 906                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 907
 908                 $text = $this->doMagicLinks( $text );
 909                 $text = $this->doTableStuff( $text );
 910                 $text = $this->formatHeadings( $text, $isMain );
 911
 912                 wfProfileOut( $fname );
 913                 return $text;
 914         }
 915
 916         /**
 917          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 918          * magic external links.
 919          *
 920          * @private
 921          */
 922         function &doMagicLinks( &$text ) {
 923                 $text = $this->magicISBN( $text );
 924                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 925                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 926                 return $text;
 927         }
 928
 929         /**
 930          * Parse headers and return html
 931          *
 932          * @private
 933          */
 934         function doHeadings( $text ) {
 935                 $fname = 'Parser::doHeadings';
 936                 wfProfileIn( $fname );
 937                 for ( $i = 6; $i >= 1; --$i ) {
 938                         $h = str_repeat( '=', $i );
 939                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 940                           "<h{$i}>\\1</h{$i}>\\2", $text );
 941                 }
 942                 wfProfileOut( $fname );
 943                 return $text;
 944         }
 945
 946         /**
 947          * Replace single quotes with HTML markup
 948          * @private
 949          * @return string the altered text
 950          */
 951         function doAllQuotes( $text ) {
 952                 $fname = 'Parser::doAllQuotes';
 953                 wfProfileIn( $fname );
 954                 $outtext = '';
 955                 $lines = explode( "\n", $text );
 956                 foreach ( $lines as $line ) {
 957                         $outtext .= $this->doQuotes ( $line ) . "\n";
 958                 }
 959                 $outtext = substr($outtext, 0,-1);
 960                 wfProfileOut( $fname );
 961                 return $outtext;
 962         }
 963
 964         /**
 965          * Helper function for doAllQuotes()
 966          * @private
 967          */
 968         function doQuotes( $text ) {
 969                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 970                 if ( count( $arr ) == 1 )
 971                         return $text;
 972                 else
 973                 {
 974                         # First, do some preliminary work. This may shift some apostrophes from
 975                         # being mark-up to being text. It also counts the number of occurrences
 976                         # of bold and italics mark-ups.
 977                         $i = 0;
 978                         $numbold = 0;
 979                         $numitalics = 0;
 980                         foreach ( $arr as $r )
 981                         {
 982                                 if ( ( $i % 2 ) == 1 )
 983                                 {
 984                                         # If there are ever four apostrophes, assume the first is supposed to
 985                                         # be text, and the remaining three constitute mark-up for bold text.
 986                                         if ( strlen( $arr[$i] ) == 4 )
 987                                         {
 988                                                 $arr[$i-1] .= "'";
 989                                                 $arr[$i] = "'''";
 990                                         }
 991                                         # If there are more than 5 apostrophes in a row, assume they're all
 992                                         # text except for the last 5.
 993                                         else if ( strlen( $arr[$i] ) > 5 )
 994                                         {
 995                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 996                                                 $arr[$i] = "'''''";
 997                                         }
 998                                         # Count the number of occurrences of bold and italics mark-ups.
 999                                         # We are not counting sequences of five apostrophes.
1000                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
1001                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
1002                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1003                                 }
1004                                 $i++;
1005                         }
1006
1007                         # If there is an odd number of both bold and italics, it is likely
1008                         # that one of the bold ones was meant to be an apostrophe followed
1009                         # by italics. Which one we cannot know for certain, but it is more
1010                         # likely to be one that has a single-letter word before it.
1011                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1012                         {
1013                                 $i = 0;
1014                                 $firstsingleletterword = -1;
1015                                 $firstmultiletterword = -1;
1016                                 $firstspace = -1;
1017                                 foreach ( $arr as $r )
1018                                 {
1019                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1020                                         {
1021                                                 $x1 = substr ($arr[$i-1], -1);
1022                                                 $x2 = substr ($arr[$i-1], -2, 1);
1023                                                 if ($x1 == ' ') {
1024                                                         if ($firstspace == -1) $firstspace = $i;
1025                                                 } else if ($x2 == ' ') {
1026                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1027                                                 } else {
1028                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1029                                                 }
1030                                         }
1031                                         $i++;
1032                                 }
1033
1034                                 # If there is a single-letter word, use it!
1035                                 if ($firstsingleletterword > -1)
1036                                 {
1037                                         $arr [ $firstsingleletterword ] = "''";
1038                                         $arr [ $firstsingleletterword-1 ] .= "'";
1039                                 }
1040                                 # If not, but there's a multi-letter word, use that one.
1041                                 else if ($firstmultiletterword > -1)
1042                                 {
1043                                         $arr [ $firstmultiletterword ] = "''";
1044                                         $arr [ $firstmultiletterword-1 ] .= "'";
1045                                 }
1046                                 # ... otherwise use the first one that has neither.
1047                                 # (notice that it is possible for all three to be -1 if, for example,
1048                                 # there is only one pentuple-apostrophe in the line)
1049                                 else if ($firstspace > -1)
1050                                 {
1051                                         $arr [ $firstspace ] = "''";
1052                                         $arr [ $firstspace-1 ] .= "'";
1053                                 }
1054                         }
1055
1056                         # Now let's actually convert our apostrophic mush to HTML!
1057                         $output = '';
1058                         $buffer = '';
1059                         $state = '';
1060                         $i = 0;
1061                         foreach ($arr as $r)
1062                         {
1063                                 if (($i % 2) == 0)
1064                                 {
1065                                         if ($state == 'both')
1066                                                 $buffer .= $r;
1067                                         else
1068                                                 $output .= $r;
1069                                 }
1070                                 else
1071                                 {
1072                                         if (strlen ($r) == 2)
1073                                         {
1074                                                 if ($state == 'i')
1075                                                 { $output .= '</i>'; $state = ''; }
1076                                                 else if ($state == 'bi')
1077                                                 { $output .= '</i>'; $state = 'b'; }
1078                                                 else if ($state == 'ib')
1079                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1080                                                 else if ($state == 'both')
1081                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1082                                                 else # $state can be 'b' or ''
1083                                                 { $output .= '<i>'; $state .= 'i'; }
1084                                         }
1085                                         else if (strlen ($r) == 3)
1086                                         {
1087                                                 if ($state == 'b')
1088                                                 { $output .= '</b>'; $state = ''; }
1089                                                 else if ($state == 'bi')
1090                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1091                                                 else if ($state == 'ib')
1092                                                 { $output .= '</b>'; $state = 'i'; }
1093                                                 else if ($state == 'both')
1094                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1095                                                 else # $state can be 'i' or ''
1096                                                 { $output .= '<b>'; $state .= 'b'; }
1097                                         }
1098                                         else if (strlen ($r) == 5)
1099                                         {
1100                                                 if ($state == 'b')
1101                                                 { $output .= '</b><i>'; $state = 'i'; }
1102                                                 else if ($state == 'i')
1103                                                 { $output .= '</i><b>'; $state = 'b'; }
1104                                                 else if ($state == 'bi')
1105                                                 { $output .= '</i></b>'; $state = ''; }
1106                                                 else if ($state == 'ib')
1107                                                 { $output .= '</b></i>'; $state = ''; }
1108                                                 else if ($state == 'both')
1109                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1110                                                 else # ($state == '')
1111                                                 { $buffer = ''; $state = 'both'; }
1112                                         }
1113                                 }
1114                                 $i++;
1115                         }
1116                         # Now close all remaining tags.  Notice that the order is important.
1117                         if ($state == 'b' || $state == 'ib')
1118                                 $output .= '</b>';
1119                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1120                                 $output .= '</i>';
1121                         if ($state == 'bi')
1122                                 $output .= '</b>';
1123                         if ($state == 'both')
1124                                 $output .= '<b><i>'.$buffer.'</i></b>';
1125                         return $output;
1126                 }
1127         }
1128
1129         /**
1130          * Replace external links
1131          *
1132          * Note: this is all very hackish and the order of execution matters a lot.
1133          * Make sure to run maintenance/parserTests.php if you change this code.
1134          *
1135          * @private
1136          */
1137         function replaceExternalLinks( $text ) {
1138                 global $wgContLang;
1139                 $fname = 'Parser::replaceExternalLinks';
1140                 wfProfileIn( $fname );
1141
1142                 $sk =& $this->mOptions->getSkin();
1143
1144                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1145
1146                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1147
1148                 $i = 0;
1149                 while ( $i<count( $bits ) ) {
1150                         $url = $bits[$i++];
1151                         $protocol = $bits[$i++];
1152                         $text = $bits[$i++];
1153                         $trail = $bits[$i++];
1154
1155                         # The characters '<' and '>' (which were escaped by
1156                         # removeHTMLtags()) should not be included in
1157                         # URLs, per RFC 2396.
1158                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1159                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1160                                 $url = substr($url, 0, $m2[0][1]);
1161                         }
1162
1163                         # If the link text is an image URL, replace it with an <img> tag
1164                         # This happened by accident in the original parser, but some people used it extensively
1165                         $img = $this->maybeMakeExternalImage( $text );
1166                         if ( $img !== false ) {
1167                                 $text = $img;
1168                         }
1169
1170                         $dtrail = '';
1171
1172                         # Set linktype for CSS - if URL==text, link is essentially free
1173                         $linktype = ($text == $url) ? 'free' : 'text';
1174
1175                         # No link text, e.g. [http://domain.tld/some.link]
1176                         if ( $text == '' ) {
1177                                 # Autonumber if allowed
1178                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1179                                         $text = '[' . ++$this->mAutonumber . ']';
1180                                         $linktype = 'autonumber';
1181                                 } else {
1182                                         # Otherwise just use the URL
1183                                         $text = htmlspecialchars( $url );
1184                                         $linktype = 'free';
1185                                 }
1186                         } else {
1187                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1188                                 # Check for trail
1189                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1190                         }
1191
1192                         $text = $wgContLang->markNoConversion($text);
1193
1194                         # Replace &amp; from obsolete syntax with &.
1195                         # All HTML entities will be escaped by makeExternalLink()
1196                         $url = str_replace( '&amp;', '&', $url );
1197
1198                         # Process the trail (i.e. everything after this link up until start of the next link),
1199                         # replacing any non-bracketed links
1200                         $trail = $this->replaceFreeExternalLinks( $trail );
1201
1202                         # Use the encoded URL
1203                         # This means that users can paste URLs directly into the text
1204                         # Funny characters like &ouml; aren't valid in URLs anyway
1205                         # This was changed in August 2004
1206                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1207
1208                         # Register link in the output object.
1209                         # Replace unnecessary URL escape codes with the referenced character
1210                         # This prevents spammers from hiding links from the filters
1211                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1212                         $this->mOutput->addExternalLink( $pasteurized );
1213                 }
1214
1215                 wfProfileOut( $fname );
1216                 return $s;
1217         }
1218
1219         /**
1220          * Replace anything that looks like a URL with a link
1221          * @private
1222          */
1223         function replaceFreeExternalLinks( $text ) {
1224                 global $wgContLang;
1225                 $fname = 'Parser::replaceFreeExternalLinks';
1226                 wfProfileIn( $fname );
1227
1228                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1229                 $s = array_shift( $bits );
1230                 $i = 0;
1231
1232                 $sk =& $this->mOptions->getSkin();
1233
1234                 while ( $i < count( $bits ) ){
1235                         $protocol = $bits[$i++];
1236                         $remainder = $bits[$i++];
1237
1238                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1239                                 # Found some characters after the protocol that look promising
1240                                 $url = $protocol . $m[1];
1241                                 $trail = $m[2];
1242
1243                                 # special case: handle urls as url args:
1244                                 # http://www.example.com/foo?=http://www.example.com/bar
1245                                 if(strlen($trail) == 0 &&
1246                                         isset($bits[$i]) &&
1247                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1248                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1249                                 {
1250                                         # add protocol, arg
1251                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1252                                         $i += 2;
1253                                         $trail = $m[2];
1254                                 }
1255
1256                                 # The characters '<' and '>' (which were escaped by
1257                                 # removeHTMLtags()) should not be included in
1258                                 # URLs, per RFC 2396.
1259                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1260                                         $trail = substr($url, $m2[0][1]) . $trail;
1261                                         $url = substr($url, 0, $m2[0][1]);
1262                                 }
1263
1264                                 # Move trailing punctuation to $trail
1265                                 $sep = ',;\.:!?';
1266                                 # If there is no left bracket, then consider right brackets fair game too
1267                                 if ( strpos( $url, '(' ) === false ) {
1268                                         $sep .= ')';
1269                                 }
1270
1271                                 $numSepChars = strspn( strrev( $url ), $sep );
1272                                 if ( $numSepChars ) {
1273                                         $trail = substr( $url, -$numSepChars ) . $trail;
1274                                         $url = substr( $url, 0, -$numSepChars );
1275                                 }
1276
1277                                 # Replace &amp; from obsolete syntax with &.
1278                                 # All HTML entities will be escaped by makeExternalLink()
1279                                 # or maybeMakeExternalImage()
1280                                 $url = str_replace( '&amp;', '&', $url );
1281
1282                                 # Is this an external image?
1283                                 $text = $this->maybeMakeExternalImage( $url );
1284                                 if ( $text === false ) {
1285                                         # Not an image, make a link
1286                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1287                                         # Register it in the output object...
1288                                         # Replace unnecessary URL escape codes with their equivalent characters
1289                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1290                                         $this->mOutput->addExternalLink( $pasteurized );
1291                                 }
1292                                 $s .= $text . $trail;
1293                         } else {
1294                                 $s .= $protocol . $remainder;
1295                         }
1296                 }
1297                 wfProfileOut( $fname );
1298                 return $s;
1299         }
1300
1301         /**
1302          * Replace unusual URL escape codes with their equivalent characters
1303          * @param string
1304          * @return string
1305          * @static
1306          * @fixme This can merge genuinely required bits in the path or query string,
1307          *        breaking legit URLs. A proper fix would treat the various parts of
1308          *        the URL differently; as a workaround, just use the output for
1309          *        statistical records, not for actual linking/output.
1310          */
1311         function replaceUnusualEscapes( $url ) {
1312                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1313                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1314         }
1315
1316         /**
1317          * Callback function used in replaceUnusualEscapes().
1318          * Replaces unusual URL escape codes with their equivalent character
1319          * @static
1320          * @private
1321          */
1322         function replaceUnusualEscapesCallback( $matches ) {
1323                 $char = urldecode( $matches[0] );
1324                 $ord = ord( $char );
1325                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1326                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1327                         // No, shouldn't be escaped
1328                         return $char;
1329                 } else {
1330                         // Yes, leave it escaped
1331                         return $matches[0];
1332                 }
1333         }
1334
1335         /**
1336          * make an image if it's allowed, either through the global
1337          * option or through the exception
1338          * @private
1339          */
1340         function maybeMakeExternalImage( $url ) {
1341                 $sk =& $this->mOptions->getSkin();
1342                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1343                 $imagesexception = !empty($imagesfrom);
1344                 $text = false;
1345                 if ( $this->mOptions->getAllowExternalImages()
1346                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1347                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1348                                 # Image found
1349                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1350                         }
1351                 }
1352                 return $text;
1353         }
1354
1355         /**
1356          * Process [[ ]] wikilinks
1357          *
1358          * @private
1359          */
1360         function replaceInternalLinks( $s ) {
1361                 global $wgContLang;
1362                 static $fname = 'Parser::replaceInternalLinks' ;
1363
1364                 wfProfileIn( $fname );
1365
1366                 wfProfileIn( $fname.'-setup' );
1367                 static $tc = FALSE;
1368                 # the % is needed to support urlencoded titles as well
1369                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1370
1371                 $sk =& $this->mOptions->getSkin();
1372
1373                 #split the entire text string on occurences of [[
1374                 $a = explode( '[[', ' ' . $s );
1375                 #get the first element (all text up to first [[), and remove the space we added
1376                 $s = array_shift( $a );
1377                 $s = substr( $s, 1 );
1378
1379                 # Match a link having the form [[namespace:link|alternate]]trail
1380                 static $e1 = FALSE;
1381                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1382                 # Match cases where there is no "]]", which might still be images
1383                 static $e1_img = FALSE;
1384                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1385                 # Match the end of a line for a word that's not followed by whitespace,
1386                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1387                 $e2 = wfMsgForContent( 'linkprefix' );
1388
1389                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1390
1391                 if( is_null( $this->mTitle ) ) {
1392                         wfDebugDieBacktrace( 'nooo' );
1393                 }
1394                 $nottalk = !$this->mTitle->isTalkPage();
1395
1396                 if ( $useLinkPrefixExtension ) {
1397                         if ( preg_match( $e2, $s, $m ) ) {
1398                                 $first_prefix = $m[2];
1399                         } else {
1400                                 $first_prefix = false;
1401                         }
1402                 } else {
1403                         $prefix = '';
1404                 }
1405
1406                 $selflink = $this->mTitle->getPrefixedText();
1407                 wfProfileOut( $fname.'-setup' );
1408
1409                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1410                 $useSubpages = $this->areSubpagesAllowed();
1411
1412                 # Loop for each link
1413                 for ($k = 0; isset( $a[$k] ); $k++) {
1414                         $line = $a[$k];
1415                         if ( $useLinkPrefixExtension ) {
1416                                 wfProfileIn( $fname.'-prefixhandling' );
1417                                 if ( preg_match( $e2, $s, $m ) ) {
1418                                         $prefix = $m[2];
1419                                         $s = $m[1];
1420                                 } else {
1421                                         $prefix='';
1422                                 }
1423                                 # first link
1424                                 if($first_prefix) {
1425                                         $prefix = $first_prefix;
1426                                         $first_prefix = false;
1427                                 }
1428                                 wfProfileOut( $fname.'-prefixhandling' );
1429                         }
1430
1431                         $might_be_img = false;
1432
1433                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1434                                 $text = $m[2];
1435                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1436                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1437                                 # the real problem is with the $e1 regex
1438                                 # See bug 1300.
1439                                 #
1440                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1441                                 # and no image is in sight. See bug 2095.
1442                                 #
1443                                 if( $text !== '' &&
1444                                         preg_match( "/^\](.*)/s", $m[3], $n ) &&
1445                                         strpos($text, '[') !== false
1446                                 )
1447                                 {
1448                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1449                                         $m[3] = $n[1];
1450                                 }
1451                                 # fix up urlencoded title texts
1452                                 if(preg_match('/%/', $m[1] ))
1453                                         # Should anchors '#' also be rejected?
1454                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1455                                 $trail = $m[3];
1456                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1457                                 $might_be_img = true;
1458                                 $text = $m[2];
1459                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1460                                 $trail = "";
1461                         } else { # Invalid form; output directly
1462                                 $s .= $prefix . '[[' . $line ;
1463                                 continue;
1464                         }
1465
1466                         # Don't allow internal links to pages containing
1467                         # PROTO: where PROTO is a valid URL protocol; these
1468                         # should be external links.
1469                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1470                                 $s .= $prefix . '[[' . $line ;
1471                                 continue;
1472                         }
1473
1474                         # Make subpage if necessary
1475                         if( $useSubpages ) {
1476                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1477                         } else {
1478                                 $link = $m[1];
1479                         }
1480
1481                         $noforce = (substr($m[1], 0, 1) != ':');
1482                         if (!$noforce) {
1483                                 # Strip off leading ':'
1484                                 $link = substr($link, 1);
1485                         }
1486
1487                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1488                         if( !$nt ) {
1489                                 $s .= $prefix . '[[' . $line;
1490                                 continue;
1491                         }
1492
1493                         #check other language variants of the link
1494                         #if the article does not exist
1495                         if( $checkVariantLink
1496                             && $nt->getArticleID() == 0 ) {
1497                                 $wgContLang->findVariantLink($link, $nt);
1498                         }
1499
1500                         $ns = $nt->getNamespace();
1501                         $iw = $nt->getInterWiki();
1502
1503                         if ($might_be_img) { # if this is actually an invalid link
1504                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1505                                         $found = false;
1506                                         while (isset ($a[$k+1]) ) {
1507                                                 #look at the next 'line' to see if we can close it there
1508                                                 $spliced = array_splice( $a, $k + 1, 1 );
1509                                                 $next_line = array_shift( $spliced );
1510                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1511                                                 # the first ]] closes the inner link, the second the image
1512                                                         $found = true;
1513                                                         $text .= '[[' . $m[1];
1514                                                         $trail = $m[2];
1515                                                         break;
1516                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1517                                                         #if there's exactly one ]] that's fine, we'll keep looking
1518                                                         $text .= '[[' . $m[0];
1519                                                 } else {
1520                                                         #if $next_line is invalid too, we need look no further
1521                                                         $text .= '[[' . $next_line;
1522                                                         break;
1523                                                 }
1524                                         }
1525                                         if ( !$found ) {
1526                                                 # we couldn't find the end of this imageLink, so output it raw
1527                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1528                                                 $text = $this->replaceInternalLinks($text);
1529                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1530                                                 # note: no $trail, because without an end, there *is* no trail
1531                                                 continue;
1532                                         }
1533                                 } else { #it's not an image, so output it raw
1534                                         $s .= $prefix . '[[' . $link . '|' . $text;
1535                                         # note: no $trail, because without an end, there *is* no trail
1536                                         continue;
1537                                 }
1538                         }
1539
1540                         $wasblank = ( '' == $text );
1541                         if( $wasblank ) $text = $link;
1542
1543
1544                         # Link not escaped by : , create the various objects
1545                         if( $noforce ) {
1546
1547                                 # Interwikis
1548                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1549                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1550                                         $s = rtrim($s . "\n");
1551                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1552                                         continue;
1553                                 }
1554
1555                                 if ( $ns == NS_IMAGE ) {
1556                                         wfProfileIn( "$fname-image" );
1557                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1558                                                 # recursively parse links inside the image caption
1559                                                 # actually, this will parse them in any other parameters, too,
1560                                                 # but it might be hard to fix that, and it doesn't matter ATM
1561                                                 $text = $this->replaceExternalLinks($text);
1562                                                 $text = $this->replaceInternalLinks($text);
1563
1564                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1565                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1566                                                 $this->mOutput->addImage( $nt->getDBkey() );
1567
1568                                                 wfProfileOut( "$fname-image" );
1569                                                 continue;
1570                                         }
1571                                         wfProfileOut( "$fname-image" );
1572
1573                                 }
1574
1575                                 if ( $ns == NS_CATEGORY ) {
1576                                         wfProfileIn( "$fname-category" );
1577                                         $s = rtrim($s . "\n"); # bug 87
1578
1579                                         if ( $wasblank ) {
1580                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1581                                                         $sortkey = $this->mTitle->getText();
1582                                                 } else {
1583                                                         $sortkey = $this->mTitle->getPrefixedText();
1584                                                 }
1585                                         } else {
1586                                                 $sortkey = $text;
1587                                         }
1588                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1589                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1590                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1591
1592                                         /**
1593                                          * Strip the whitespace Category links produce, see bug 87
1594                                          * @todo We might want to use trim($tmp, "\n") here.
1595                                          */
1596                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1597
1598                                         wfProfileOut( "$fname-category" );
1599                                         continue;
1600                                 }
1601                         }
1602
1603                         if( ( $nt->getPrefixedText() === $selflink ) &&
1604                             ( $nt->getFragment() === '' ) ) {
1605                                 # Self-links are handled specially; generally de-link and change to bold.
1606                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1607                                 continue;
1608                         }
1609
1610                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1611                         if( $ns == NS_MEDIA ) {
1612                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1613                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1614                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1615                                 $this->mOutput->addImage( $nt->getDBkey() );
1616                                 continue;
1617                         } elseif( $ns == NS_SPECIAL ) {
1618                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1619                                 continue;
1620                         } elseif( $ns == NS_IMAGE ) {
1621                                 $img = Image::newFromTitle( $nt );
1622                                 if( $img->exists() ) {
1623                                         // Force a blue link if the file exists; may be a remote
1624                                         // upload on the shared repository, and we want to see its
1625                                         // auto-generated page.
1626                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1627                                         continue;
1628                                 }
1629                         }
1630                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1631                 }
1632                 wfProfileOut( $fname );
1633                 return $s;
1634         }
1635
1636         /**
1637          * Make a link placeholder. The text returned can be later resolved to a real link with
1638          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1639          * parsing of interwiki links, and secondly to allow all extistence checks and
1640          * article length checks (for stub links) to be bundled into a single query.
1641          *
1642          */
1643         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1644                 if ( ! is_object($nt) ) {
1645                         # Fail gracefully
1646                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1647                 } else {
1648                         # Separate the link trail from the rest of the link
1649                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1650
1651                         if ( $nt->isExternal() ) {
1652                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1653                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1654                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1655                         } else {
1656                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1657                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1658                                 $this->mLinkHolders['queries'][] = $query;
1659                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1660                                 $this->mLinkHolders['titles'][] = $nt;
1661
1662                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1663                         }
1664                 }
1665                 return $retVal;
1666         }
1667
1668         /**
1669          * Render a forced-blue link inline; protect against double expansion of
1670          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1671          * Since this little disaster has to split off the trail text to avoid
1672          * breaking URLs in the following text without breaking trails on the
1673          * wiki links, it's been made into a horrible function.
1674          *
1675          * @param Title $nt
1676          * @param string $text
1677          * @param string $query
1678          * @param string $trail
1679          * @param string $prefix
1680          * @return string HTML-wikitext mix oh yuck
1681          */
1682         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1683                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1684                 $sk =& $this->mOptions->getSkin();
1685                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1686                 return $this->armorLinks( $link ) . $trail;
1687         }
1688
1689         /**
1690          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1691          * going to go through further parsing steps before inline URL expansion.
1692          *
1693          * In particular this is important when using action=render, which causes
1694          * full URLs to be included.
1695          *
1696          * Oh man I hate our multi-layer parser!
1697          *
1698          * @param string more-or-less HTML
1699          * @return string less-or-more HTML with NOPARSE bits
1700          */
1701         function armorLinks( $text ) {
1702                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1703                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1704         }
1705
1706         /**
1707          * Return true if subpage links should be expanded on this page.
1708          * @return bool
1709          */
1710         function areSubpagesAllowed() {
1711                 # Some namespaces don't allow subpages
1712                 global $wgNamespacesWithSubpages;
1713                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1714         }
1715
1716         /**
1717          * Handle link to subpage if necessary
1718          * @param string $target the source of the link
1719          * @param string &$text the link text, modified as necessary
1720          * @return string the full name of the link
1721          * @private
1722          */
1723         function maybeDoSubpageLink($target, &$text) {
1724                 # Valid link forms:
1725                 # Foobar -- normal
1726                 # :Foobar -- override special treatment of prefix (images, language links)
1727                 # /Foobar -- convert to CurrentPage/Foobar
1728                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1729                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1730                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1731
1732                 $fname = 'Parser::maybeDoSubpageLink';
1733                 wfProfileIn( $fname );
1734                 $ret = $target; # default return value is no change
1735
1736                 # Some namespaces don't allow subpages,
1737                 # so only perform processing if subpages are allowed
1738                 if( $this->areSubpagesAllowed() ) {
1739                         # Look at the first character
1740                         if( $target != '' && $target{0} == '/' ) {
1741                                 # / at end means we don't want the slash to be shown
1742                                 if( substr( $target, -1, 1 ) == '/' ) {
1743                                         $target = substr( $target, 1, -1 );
1744                                         $noslash = $target;
1745                                 } else {
1746                                         $noslash = substr( $target, 1 );
1747                                 }
1748
1749                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1750                                 if( '' === $text ) {
1751                                         $text = $target;
1752                                 } # this might be changed for ugliness reasons
1753                         } else {
1754                                 # check for .. subpage backlinks
1755                                 $dotdotcount = 0;
1756                                 $nodotdot = $target;
1757                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1758                                         ++$dotdotcount;
1759                                         $nodotdot = substr( $nodotdot, 3 );
1760                                 }
1761                                 if($dotdotcount > 0) {
1762                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1763                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1764                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1765                                                 # / at the end means don't show full path
1766                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1767                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1768                                                         if( '' === $text ) {
1769                                                                 $text = $nodotdot;
1770                                                         }
1771                                                 }
1772                                                 $nodotdot = trim( $nodotdot );
1773                                                 if( $nodotdot != '' ) {
1774                                                         $ret .= '/' . $nodotdot;
1775                                                 }
1776                                         }
1777                                 }
1778                         }
1779                 }
1780
1781                 wfProfileOut( $fname );
1782                 return $ret;
1783         }
1784
1785         /**#@+
1786          * Used by doBlockLevels()
1787          * @private
1788          */
1789         /* private */ function closeParagraph() {
1790                 $result = '';
1791                 if ( '' != $this->mLastSection ) {
1792                         $result = '</' . $this->mLastSection  . ">\n";
1793                 }
1794                 $this->mInPre = false;
1795                 $this->mLastSection = '';
1796                 return $result;
1797         }
1798         # getCommon() returns the length of the longest common substring
1799         # of both arguments, starting at the beginning of both.
1800         #
1801         /* private */ function getCommon( $st1, $st2 ) {
1802                 $fl = strlen( $st1 );
1803                 $shorter = strlen( $st2 );
1804                 if ( $fl < $shorter ) { $shorter = $fl; }
1805
1806                 for ( $i = 0; $i < $shorter; ++$i ) {
1807                         if ( $st1{$i} != $st2{$i} ) { break; }
1808                 }
1809                 return $i;
1810         }
1811         # These next three functions open, continue, and close the list
1812         # element appropriate to the prefix character passed into them.
1813         #
1814         /* private */ function openList( $char ) {
1815                 $result = $this->closeParagraph();
1816
1817                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1818                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1819                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1820                 else if ( ';' == $char ) {
1821                         $result .= '<dl><dt>';
1822                         $this->mDTopen = true;
1823                 }
1824                 else { $result = '<!-- ERR 1 -->'; }
1825
1826                 return $result;
1827         }
1828
1829         /* private */ function nextItem( $char ) {
1830                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1831                 else if ( ':' == $char || ';' == $char ) {
1832                         $close = '</dd>';
1833                         if ( $this->mDTopen ) { $close = '</dt>'; }
1834                         if ( ';' == $char ) {
1835                                 $this->mDTopen = true;
1836                                 return $close . '<dt>';
1837                         } else {
1838                                 $this->mDTopen = false;
1839                                 return $close . '<dd>';
1840                         }
1841                 }
1842                 return '<!-- ERR 2 -->';
1843         }
1844
1845         /* private */ function closeList( $char ) {
1846                 if ( '*' == $char ) { $text = '</li></ul>'; }
1847                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1848                 else if ( ':' == $char ) {
1849                         if ( $this->mDTopen ) {
1850                                 $this->mDTopen = false;
1851                                 $text = '</dt></dl>';
1852                         } else {
1853                                 $text = '</dd></dl>';
1854                         }
1855                 }
1856                 else {  return '<!-- ERR 3 -->'; }
1857                 return $text."\n";
1858         }
1859         /**#@-*/
1860
1861         /**
1862          * Make lists from lines starting with ':', '*', '#', etc.
1863          *
1864          * @private
1865          * @return string the lists rendered as HTML
1866          */
1867         function doBlockLevels( $text, $linestart ) {
1868                 $fname = 'Parser::doBlockLevels';
1869                 wfProfileIn( $fname );
1870
1871                 # Parsing through the text line by line.  The main thing
1872                 # happening here is handling of block-level elements p, pre,
1873                 # and making lists from lines starting with * # : etc.
1874                 #
1875                 $textLines = explode( "\n", $text );
1876
1877                 $lastPrefix = $output = '';
1878                 $this->mDTopen = $inBlockElem = false;
1879                 $prefixLength = 0;
1880                 $paragraphStack = false;
1881
1882                 if ( !$linestart ) {
1883                         $output .= array_shift( $textLines );
1884                 }
1885                 foreach ( $textLines as $oLine ) {
1886                         $lastPrefixLength = strlen( $lastPrefix );
1887                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1888                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1889                         if ( !$this->mInPre ) {
1890                                 # Multiple prefixes may abut each other for nested lists.
1891                                 $prefixLength = strspn( $oLine, '*#:;' );
1892                                 $pref = substr( $oLine, 0, $prefixLength );
1893
1894                                 # eh?
1895                                 $pref2 = str_replace( ';', ':', $pref );
1896                                 $t = substr( $oLine, $prefixLength );
1897                                 $this->mInPre = !empty($preOpenMatch);
1898                         } else {
1899                                 # Don't interpret any other prefixes in preformatted text
1900                                 $prefixLength = 0;
1901                                 $pref = $pref2 = '';
1902                                 $t = $oLine;
1903                         }
1904
1905                         # List generation
1906                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1907                                 # Same as the last item, so no need to deal with nesting or opening stuff
1908                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1909                                 $paragraphStack = false;
1910
1911                                 if ( substr( $pref, -1 ) == ';') {
1912                                         # The one nasty exception: definition lists work like this:
1913                                         # ; title : definition text
1914                                         # So we check for : in the remainder text to split up the
1915                                         # title and definition, without b0rking links.
1916                                         $term = $t2 = '';
1917                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1918                                                 $t = $t2;
1919                                                 $output .= $term . $this->nextItem( ':' );
1920                                         }
1921                                 }
1922                         } elseif( $prefixLength || $lastPrefixLength ) {
1923                                 # Either open or close a level...
1924                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1925                                 $paragraphStack = false;
1926
1927                                 while( $commonPrefixLength < $lastPrefixLength ) {
1928                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1929                                         --$lastPrefixLength;
1930                                 }
1931                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1932                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1933                                 }
1934                                 while ( $prefixLength > $commonPrefixLength ) {
1935                                         $char = substr( $pref, $commonPrefixLength, 1 );
1936                                         $output .= $this->openList( $char );
1937
1938                                         if ( ';' == $char ) {
1939                                                 # FIXME: This is dupe of code above
1940                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1941                                                         $t = $t2;
1942                                                         $output .= $term . $this->nextItem( ':' );
1943                                                 }
1944                                         }
1945                                         ++$commonPrefixLength;
1946                                 }
1947                                 $lastPrefix = $pref2;
1948                         }
1949                         if( 0 == $prefixLength ) {
1950                                 wfProfileIn( "$fname-paragraph" );
1951                                 # No prefix (not in list)--go to paragraph mode
1952                                 // XXX: use a stack for nestable elements like span, table and div
1953                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1954                                 $closematch = preg_match(
1955                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1956                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1957                                 if ( $openmatch or $closematch ) {
1958                                         $paragraphStack = false;
1959                                         # TODO bug 5718: paragraph closed
1960                                         $output .= $this->closeParagraph();
1961                                         if ( $preOpenMatch and !$preCloseMatch ) {
1962                                                 $this->mInPre = true;
1963                                         }
1964                                         if ( $closematch ) {
1965                                                 $inBlockElem = false;
1966                                         } else {
1967                                                 $inBlockElem = true;
1968                                         }
1969                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1970                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1971                                                 // pre
1972                                                 if ($this->mLastSection != 'pre') {
1973                                                         $paragraphStack = false;
1974                                                         $output .= $this->closeParagraph().'<pre>';
1975                                                         $this->mLastSection = 'pre';
1976                                                 }
1977                                                 $t = substr( $t, 1 );
1978                                         } else {
1979                                                 // paragraph
1980                                                 if ( '' == trim($t) ) {
1981                                                         if ( $paragraphStack ) {
1982                                                                 $output .= $paragraphStack.'<br />';
1983                                                                 $paragraphStack = false;
1984                                                                 $this->mLastSection = 'p';
1985                                                         } else {
1986                                                                 if ($this->mLastSection != 'p' ) {
1987                                                                         $output .= $this->closeParagraph();
1988                                                                         $this->mLastSection = '';
1989                                                                         $paragraphStack = '<p>';
1990                                                                 } else {
1991                                                                         $paragraphStack = '</p><p>';
1992                                                                 }
1993                                                         }
1994                                                 } else {
1995                                                         if ( $paragraphStack ) {
1996                                                                 $output .= $paragraphStack;
1997                                                                 $paragraphStack = false;
1998                                                                 $this->mLastSection = 'p';
1999                                                         } else if ($this->mLastSection != 'p') {
2000                                                                 $output .= $this->closeParagraph().'<p>';
2001                                                                 $this->mLastSection = 'p';
2002                                                         }
2003                                                 }
2004                                         }
2005                                 }
2006                                 wfProfileOut( "$fname-paragraph" );
2007                         }
2008                         // somewhere above we forget to get out of pre block (bug 785)
2009                         if($preCloseMatch && $this->mInPre) {
2010                                 $this->mInPre = false;
2011                         }
2012                         if ($paragraphStack === false) {
2013                                 $output .= $t."\n";
2014                         }
2015                 }
2016                 while ( $prefixLength ) {
2017                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2018                         --$prefixLength;
2019                 }
2020                 if ( '' != $this->mLastSection ) {
2021                         $output .= '</' . $this->mLastSection . '>';
2022                         $this->mLastSection = '';
2023                 }
2024
2025                 wfProfileOut( $fname );
2026                 return $output;
2027         }
2028
2029         /**
2030          * Split up a string on ':', ignoring any occurences inside
2031          * <a>..</a> or <span>...</span>
2032          * @param string $str the string to split
2033          * @param string &$before set to everything before the ':'
2034          * @param string &$after set to everything after the ':'
2035          * return string the position of the ':', or false if none found
2036          */
2037         function findColonNoLinks($str, &$before, &$after) {
2038                 # I wonder if we should make this count all tags, not just <a>
2039                 # and <span>. That would prevent us from matching a ':' that
2040                 # comes in the middle of italics other such formatting....
2041                 # -- Wil
2042                 $fname = 'Parser::findColonNoLinks';
2043                 wfProfileIn( $fname );
2044                 $pos = 0;
2045                 do {
2046                         $colon = strpos($str, ':', $pos);
2047
2048                         if ($colon !== false) {
2049                                 $before = substr($str, 0, $colon);
2050                                 $after = substr($str, $colon + 1);
2051
2052                                 # Skip any ':' within <a> or <span> pairs
2053                                 $a = substr_count($before, '<a');
2054                                 $s = substr_count($before, '<span');
2055                                 $ca = substr_count($before, '</a>');
2056                                 $cs = substr_count($before, '</span>');
2057
2058                                 if ($a <= $ca and $s <= $cs) {
2059                                         # Tags are balanced before ':'; ok
2060                                         break;
2061                                 }
2062                                 $pos = $colon + 1;
2063                         }
2064                 } while ($colon !== false);
2065                 wfProfileOut( $fname );
2066                 return $colon;
2067         }
2068
2069         /**
2070          * Return value of a magic variable (like PAGENAME)
2071          *
2072          * @private
2073          */
2074         function getVariableValue( $index ) {
2075                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2076
2077                 /**
2078                  * Some of these require message or data lookups and can be
2079                  * expensive to check many times.
2080                  */
2081                 static $varCache = array();
2082                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2083                         if ( isset( $varCache[$index] ) )
2084                                 return $varCache[$index];
2085
2086                 $ts = time();
2087                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2088
2089                 switch ( $index ) {
2090                         case MAG_CURRENTMONTH:
2091                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2092                         case MAG_CURRENTMONTHNAME:
2093                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2094                         case MAG_CURRENTMONTHNAMEGEN:
2095                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2096                         case MAG_CURRENTMONTHABBREV:
2097                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2098                         case MAG_CURRENTDAY:
2099                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2100                         case MAG_CURRENTDAY2:
2101                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2102                         case MAG_PAGENAME:
2103                                 return $this->mTitle->getText();
2104                         case MAG_PAGENAMEE:
2105                                 return $this->mTitle->getPartialURL();
2106                         case MAG_FULLPAGENAME:
2107                                 return $this->mTitle->getPrefixedText();
2108                         case MAG_FULLPAGENAMEE:
2109                                 return $this->mTitle->getPrefixedURL();
2110                         case MAG_SUBPAGENAME:
2111                                 return $this->mTitle->getSubpageText();
2112                         case MAG_SUBPAGENAMEE:
2113                                 return $this->mTitle->getSubpageUrlForm();
2114                         case MAG_TALKPAGENAME:
2115                                 if( $this->mTitle->canTalk() ) {
2116                                         $talkPage = $this->mTitle->getTalkPage();
2117                                         return $talkPage->getPrefixedText();
2118                                 } else {
2119                                         return '';
2120                                 }
2121                         case MAG_TALKPAGENAMEE:
2122                                 if( $this->mTitle->canTalk() ) {
2123                                         $talkPage = $this->mTitle->getTalkPage();
2124                                         return $talkPage->getPrefixedUrl();
2125                                 } else {
2126                                         return '';
2127                                 }
2128                         case MAG_SUBJECTPAGENAME:
2129                                 $subjPage = $this->mTitle->getSubjectPage();
2130                                 return $subjPage->getPrefixedText();
2131                         case MAG_SUBJECTPAGENAMEE:
2132                                 $subjPage = $this->mTitle->getSubjectPage();
2133                                 return $subjPage->getPrefixedUrl();
2134                         case MAG_REVISIONID:
2135                                 return $this->mRevisionId;
2136                         case MAG_NAMESPACE:
2137                                 return $wgContLang->getNsText( $this->mTitle->getNamespace() );
2138                         case MAG_NAMESPACEE:
2139                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2140                         case MAG_TALKSPACE:
2141                                 return $this->mTitle->canTalk() ? $this->mTitle->getTalkNsText() : '';
2142                         case MAG_TALKSPACEE:
2143                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2144                         case MAG_SUBJECTSPACE:
2145                                 return $this->mTitle->getSubjectNsText();
2146                         case MAG_SUBJECTSPACEE:
2147                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2148                         case MAG_CURRENTDAYNAME:
2149                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2150                         case MAG_CURRENTYEAR:
2151                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2152                         case MAG_CURRENTTIME:
2153                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2154                         case MAG_CURRENTWEEK:
2155                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2156                                 // int to remove the padding
2157                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2158                         case MAG_CURRENTDOW:
2159                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2160                         case MAG_NUMBEROFARTICLES:
2161                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2162                         case MAG_NUMBEROFFILES:
2163                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2164                         case MAG_NUMBEROFUSERS:
2165                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfUsers() );
2166                         case MAG_SITENAME:
2167                                 return $wgSitename;
2168                         case MAG_SERVER:
2169                                 return $wgServer;
2170                         case MAG_SERVERNAME:
2171                                 return $wgServerName;
2172                         case MAG_SCRIPTPATH:
2173                                 return $wgScriptPath;
2174                         default:
2175                                 $ret = null;
2176                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2177                                         return $ret;
2178                                 else
2179                                         return null;
2180                 }
2181         }
2182
2183         /**
2184          * initialise the magic variables (like CURRENTMONTHNAME)
2185          *
2186          * @private
2187          */
2188         function initialiseVariables() {
2189                 $fname = 'Parser::initialiseVariables';
2190                 wfProfileIn( $fname );
2191                 global $wgVariableIDs;
2192                 $this->mVariables = array();
2193                 foreach ( $wgVariableIDs as $id ) {
2194                         $mw =& MagicWord::get( $id );
2195                         $mw->addToArray( $this->mVariables, $id );
2196                 }
2197                 wfProfileOut( $fname );
2198         }
2199
2200         /**
2201          * parse any parentheses in format ((title|part|part))
2202          * and call callbacks to get a replacement text for any found piece
2203          *
2204          * @param string $text The text to parse
2205          * @param array $callbacks rules in form:
2206          *     '{' => array(                            # opening parentheses
2207          *                                      'end' => '}',   # closing parentheses
2208          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2209          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2210          *                                                                )
2211          *                                      )
2212          * @private
2213          */
2214         function replace_callback ($text, $callbacks) {
2215                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2216                 $lastOpeningBrace = -1;                 # last not closed parentheses
2217
2218                 for ($i = 0; $i < strlen($text); $i++) {
2219                         # check for any opening brace
2220                         $rule = null;
2221                         $nextPos = -1;
2222                         foreach ($callbacks as $key => $value) {
2223                                 $pos = strpos ($text, $key, $i);
2224                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2225                                         $rule = $value;
2226                                         $nextPos = $pos;
2227                                 }
2228                         }
2229
2230                         if ($lastOpeningBrace >= 0) {
2231                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2232
2233                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2234                                         $rule = null;
2235                                         $nextPos = $pos;
2236                                 }
2237
2238                                 $pos = strpos ($text, '|', $i);
2239
2240                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2241                                         $rule = null;
2242                                         $nextPos = $pos;
2243                                 }
2244                         }
2245
2246                         if ($nextPos == -1)
2247                                 break;
2248
2249                         $i = $nextPos;
2250
2251                         # found openning brace, lets add it to parentheses stack
2252                         if (null != $rule) {
2253                                 $piece = array('brace' => $text[$i],
2254                                                            'braceEnd' => $rule['end'],
2255                                                            'count' => 1,
2256                                                            'title' => '',
2257                                                            'parts' => null);
2258
2259                                 # count openning brace characters
2260                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2261                                         $piece['count']++;
2262                                         $i++;
2263                                 }
2264
2265                                 $piece['startAt'] = $i+1;
2266                                 $piece['partStart'] = $i+1;
2267
2268                                 # we need to add to stack only if openning brace count is enough for any given rule
2269                                 foreach ($rule['cb'] as $cnt => $fn) {
2270                                         if ($piece['count'] >= $cnt) {
2271                                                 $lastOpeningBrace ++;
2272                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2273                                                 break;
2274                                         }
2275                                 }
2276
2277                                 continue;
2278                         }
2279                         else if ($lastOpeningBrace >= 0) {
2280                                 # first check if it is a closing brace
2281                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2282                                         # lets check if it is enough characters for closing brace
2283                                         $count = 1;
2284                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2285                                                 $count++;
2286
2287                                         # if there are more closing parentheses than opening ones, we parse less
2288                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2289                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2290
2291                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2292                                         $matchingCount = 0;
2293                                         $matchingCallback = null;
2294                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2295                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2296                                                         $matchingCount = $cnt;
2297                                                         $matchingCallback = $fn;
2298                                                 }
2299                                         }
2300
2301                                         if ($matchingCount == 0) {
2302                                                 $i += $count - 1;
2303                                                 continue;
2304                                         }
2305
2306                                         # lets set a title or last part (if '|' was found)
2307                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2308                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2309                                         else
2310                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2311
2312                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2313                                         $pieceEnd = $i + $matchingCount;
2314
2315                                         if( is_callable( $matchingCallback ) ) {
2316                                                 $cbArgs = array (
2317                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2318                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2319                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2320                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2321                                                                                  );
2322                                                 # finally we can call a user callback and replace piece of text
2323                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2324                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2325                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2326                                         }
2327                                         else {
2328                                                 # null value for callback means that parentheses should be parsed, but not replaced
2329                                                 $i += $matchingCount - 1;
2330                                         }
2331
2332                                         # reset last openning parentheses, but keep it in case there are unused characters
2333                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2334                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2335                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2336                                                                    'title' => '',
2337                                                                    'parts' => null,
2338                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2339                                         $openingBraceStack[$lastOpeningBrace--] = null;
2340
2341                                         if ($matchingCount < $piece['count']) {
2342                                                 $piece['count'] -= $matchingCount;
2343                                                 $piece['startAt'] -= $matchingCount;
2344                                                 $piece['partStart'] = $piece['startAt'];
2345                                                 # do we still qualify for any callback with remaining count?
2346                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2347                                                         if ($piece['count'] >= $cnt) {
2348                                                                 $lastOpeningBrace ++;
2349                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2350                                                                 break;
2351                                                         }
2352                                                 }
2353                                         }
2354                                         continue;
2355                                 }
2356
2357                                 # lets set a title if it is a first separator, or next part otherwise
2358                                 if ($text[$i] == '|') {
2359                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2360                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2361                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2362                                         }
2363                                         else
2364                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2365
2366                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2367                                 }
2368                         }
2369                 }
2370
2371                 return $text;
2372         }
2373
2374         /**
2375          * Replace magic variables, templates, and template arguments
2376          * with the appropriate text. Templates are substituted recursively,
2377          * taking care to avoid infinite loops.
2378          *
2379          * Note that the substitution depends on value of $mOutputType:
2380          *  OT_WIKI: only {{subst:}} templates
2381          *  OT_MSG: only magic variables
2382          *  OT_HTML: all templates and magic variables
2383          *
2384          * @param string $tex The text to transform
2385          * @param array $args Key-value pairs representing template parameters to substitute
2386          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2387          * @private
2388          */
2389         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2390                 # Prevent too big inclusions
2391                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2392                         return $text;
2393                 }
2394
2395                 $fname = 'Parser::replaceVariables';
2396                 wfProfileIn( $fname );
2397
2398                 # This function is called recursively. To keep track of arguments we need a stack:
2399                 array_push( $this->mArgStack, $args );
2400
2401                 $braceCallbacks = array();
2402                 if ( !$argsOnly ) {
2403                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2404                 }
2405                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2406                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2407                 }
2408                 $callbacks = array();
2409                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2410                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2411                 $text = $this->replace_callback ($text, $callbacks);
2412
2413                 array_pop( $this->mArgStack );
2414
2415                 wfProfileOut( $fname );
2416                 return $text;
2417         }
2418
2419         /**
2420          * Replace magic variables
2421          * @private
2422          */
2423         function variableSubstitution( $matches ) {
2424                 $fname = 'Parser::variableSubstitution';
2425                 $varname = $matches[1];
2426                 wfProfileIn( $fname );
2427                 if ( !$this->mVariables ) {
2428                         $this->initialiseVariables();
2429                 }
2430                 $skip = false;
2431                 if ( $this->mOutputType == OT_WIKI ) {
2432                         # Do only magic variables prefixed by SUBST
2433                         $mwSubst =& MagicWord::get( MAG_SUBST );
2434                         if (!$mwSubst->matchStartAndRemove( $varname ))
2435                                 $skip = true;
2436                         # Note that if we don't substitute the variable below,
2437                         # we don't remove the {{subst:}} magic word, in case
2438                         # it is a template rather than a magic variable.
2439                 }
2440                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2441                         $id = $this->mVariables[$varname];
2442                         $text = $this->getVariableValue( $id );
2443                         $this->mOutput->mContainsOldMagic = true;
2444                 } else {
2445                         $text = $matches[0];
2446                 }
2447                 wfProfileOut( $fname );
2448                 return $text;
2449         }
2450
2451         # Split template arguments
2452         function getTemplateArgs( $argsString ) {
2453                 if ( $argsString === '' ) {
2454                         return array();
2455                 }
2456
2457                 $args = explode( '|', substr( $argsString, 1 ) );
2458
2459                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2460                 # merged with the next arg because the '|' character between belongs
2461                 # to the link syntax and not the template parameter syntax.
2462                 $argc = count($args);
2463
2464                 for ( $i = 0; $i < $argc-1; $i++ ) {
2465                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2466                                 $args[$i] .= '|'.$args[$i+1];
2467                                 array_splice($args, $i+1, 1);
2468                                 $i--;
2469                                 $argc--;
2470                         }
2471                 }
2472
2473                 return $args;
2474         }
2475
2476         /**
2477          * Return the text of a template, after recursively
2478          * replacing any variables or templates within the template.
2479          *
2480          * @param array $piece The parts of the template
2481          *  $piece['text']: matched text
2482          *  $piece['title']: the title, i.e. the part before the |
2483          *  $piece['parts']: the parameter array
2484          * @return string the text of the template
2485          * @private
2486          */
2487         function braceSubstitution( $piece ) {
2488                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $action;
2489                 $fname = 'Parser::braceSubstitution';
2490                 wfProfileIn( $fname );
2491
2492                 # Flags
2493                 $found = false;             # $text has been filled
2494                 $nowiki = false;            # wiki markup in $text should be escaped
2495                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2496                 $noargs = false;            # Don't replace triple-brace arguments in $text
2497                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2498                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2499                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2500
2501                 # Title object, where $text came from
2502                 $title = NULL;
2503
2504                 $linestart = '';
2505
2506                 # $part1 is the bit before the first |, and must contain only title characters
2507                 # $args is a list of arguments, starting from index 0, not including $part1
2508
2509                 $part1 = $piece['title'];
2510                 # If the third subpattern matched anything, it will start with |
2511
2512                 if (null == $piece['parts']) {
2513                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2514                         if ($replaceWith != $piece['text']) {
2515                                 $text = $replaceWith;
2516                                 $found = true;
2517                                 $noparse = true;
2518                                 $noargs = true;
2519                         }
2520                 }
2521
2522                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2523                 $argc = count( $args );
2524
2525                 # SUBST
2526                 if ( !$found ) {
2527                         $mwSubst =& MagicWord::get( MAG_SUBST );
2528                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2529                                 # One of two possibilities is true:
2530                                 # 1) Found SUBST but not in the PST phase
2531                                 # 2) Didn't find SUBST and in the PST phase
2532                                 # In either case, return without further processing
2533                                 $text = $piece['text'];
2534                                 $found = true;
2535                                 $noparse = true;
2536                                 $noargs = true;
2537                         }
2538                 }
2539
2540                 # MSG, MSGNW, INT and RAW
2541                 if ( !$found ) {
2542                         # Check for MSGNW:
2543                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2544                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2545                                 $nowiki = true;
2546                         } else {
2547                                 # Remove obsolete MSG:
2548                                 $mwMsg =& MagicWord::get( MAG_MSG );
2549                                 $mwMsg->matchStartAndRemove( $part1 );
2550                         }
2551
2552                         # Check for RAW:
2553                         $mwRaw =& MagicWord::get( MAG_RAW );
2554                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2555                                 $forceRawInterwiki = true;
2556                         }
2557
2558                         # Check if it is an internal message
2559                         $mwInt =& MagicWord::get( MAG_INT );
2560                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2561                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2562                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2563                                         $found = true;
2564                                 }
2565                         }
2566                 }
2567
2568                 # NS
2569                 if ( !$found ) {
2570                         # Check for NS: (namespace expansion)
2571                         $mwNs = MagicWord::get( MAG_NS );
2572                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2573                                 if ( intval( $part1 ) || $part1 == "0" ) {
2574                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2575                                         $found = true;
2576                                 } else {
2577                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2578                                         if ( !is_null( $index ) ) {
2579                                                 $text = $linestart . $wgContLang->getNsText( $index );
2580                                                 $found = true;
2581                                         }
2582                                 }
2583                         }
2584                 }
2585
2586                 # LCFIRST, UCFIRST, LC and UC
2587                 if ( !$found ) {
2588                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2589                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2590                         $lc =& MagicWord::get( MAG_LC );
2591                         $uc =& MagicWord::get( MAG_UC );
2592                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2593                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2594                                 $found = true;
2595                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2596                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2597                                 $found = true;
2598                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2599                                 $text = $linestart . $wgContLang->lc( $part1 );
2600                                 $found = true;
2601                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2602                                  $text = $linestart . $wgContLang->uc( $part1 );
2603                                  $found = true;
2604                         }
2605                 }
2606
2607                 # LOCALURL and FULLURL
2608                 if ( !$found ) {
2609                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2610                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2611                         $mwFull =& MagicWord::get( MAG_FULLURL );
2612                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2613
2614
2615                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2616                                 $func = 'getLocalURL';
2617                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2618                                 $func = 'escapeLocalURL';
2619                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2620                                 $func = 'getFullURL';
2621                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2622                                 $func = 'escapeFullURL';
2623                         } else {
2624                                 $func = false;
2625                         }
2626
2627                         if ( $func !== false ) {
2628                                 $title = Title::newFromText( $part1 );
2629                                 if ( !is_null( $title ) ) {
2630                                         if ( $argc > 0 ) {
2631                                                 $text = $linestart . $title->$func( $args[0] );
2632                                         } else {
2633                                                 $text = $linestart . $title->$func();
2634                                         }
2635                                         $found = true;
2636                                 }
2637                         }
2638                 }
2639
2640                 $lang = $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
2641                 # GRAMMAR
2642                 if ( !$found && $argc == 1 ) {
2643                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2644                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2645                                 $text = $linestart . $lang->convertGrammar( $args[0], $part1 );
2646                                 $found = true;
2647                         }
2648                 }
2649
2650                 # PLURAL
2651                 if ( !$found && $argc >= 2 ) {
2652                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2653                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2654                                 if ($argc==2) {$args[2]=$args[1];}
2655                                 $text = $linestart . $lang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2656                                 $found = true;
2657                         }
2658                 }
2659
2660                 # DISPLAYTITLE
2661                 if ( !$found && $argc == 1 && $wgAllowDisplayTitle ) {
2662                         $mwDT =& MagicWord::get( MAG_DISPLAYTITLE );
2663                         if ( $mwDT->matchStartAndRemove( $part1 ) ) {
2664
2665                                 # Set title in parser output object
2666                                 $param = $args[0];
2667                                 $parserOptions = new ParserOptions;
2668                                 $local_parser = new Parser ();
2669                                 $t2 = $local_parser->parse ( $param, $this->mTitle, $parserOptions, false );
2670                                 $this->mOutput->mHTMLtitle = $t2->GetText();
2671
2672                                 # Add subtitle
2673                                 $t = $this->mTitle->getPrefixedText();
2674                                 $this->mOutput->mSubtitle .= wfMsg('displaytitle', $t);
2675                                 $text = "" ;
2676                                 $found = true ;
2677                         }
2678                 }
2679
2680                 # NUMBEROFUSERS, NUMBEROFARTICLES, and NUMBEROFFILES
2681                 if( !$found ) {
2682                         $mwWordsToCheck = array( MAG_NUMBEROFUSERS => 'wfNumberOfUsers', MAG_NUMBEROFARTICLES => 'wfNumberOfArticles', MAG_NUMBEROFFILES => 'wfNumberOfFiles' );
2683                         foreach( $mwWordsToCheck as $word => $func ) {
2684                                 $mwCurrentWord =& MagicWord::get( $word );
2685                                 if( $mwCurrentWord->matchStartAndRemove( $part1 ) ) {
2686                                         $mwRawSuffix =& MagicWord::get( MAG_RAWSUFFIX );
2687                                         if( $mwRawSuffix->match( $args[0] ) ) {
2688                                                 # Raw and unformatted
2689                                                 $text = $linestart . call_user_func( $func );
2690                                         } else {
2691                                                 # Formatted according to the content default
2692                                                 $text = $linestart . $wgContLang->formatNum( call_user_func( $func ) );
2693                                         }
2694                                         $found = true;
2695                                 }
2696                         }
2697                 }
2698
2699                 # Extensions
2700                 if ( !$found && substr( $part1, 0, 1 ) == '#' ) {
2701                         $colonPos = strpos( $part1, ':' );
2702                         if ( $colonPos !== false ) {
2703                                 $function = strtolower( substr( $part1, 1, $colonPos - 1 ) );
2704                                 if ( isset( $this->mFunctionHooks[$function] ) ) {
2705                                         $funcArgs = array_map( 'trim', $args );
2706                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2707                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2708                                         $found = true;
2709
2710                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2711                                         //$noargs = true;
2712                                         //$noparse = true;
2713
2714                                         if ( is_array( $result ) ) {
2715                                                 $text = $linestart . $result[0];
2716                                                 unset( $result[0] );
2717
2718                                                 // Extract flags into the local scope
2719                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2720                                                 extract( $result );
2721                                         } else {
2722                                                 $text = $linestart . $result;
2723                                         }
2724                                 }
2725                         }
2726                 }
2727
2728                 # Template table test
2729
2730                 # Did we encounter this template already? If yes, it is in the cache
2731                 # and we need to check for loops.
2732                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2733                         $found = true;
2734
2735                         # Infinite loop test
2736                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2737                                 $noparse = true;
2738                                 $noargs = true;
2739                                 $found = true;
2740                                 $text = $linestart .
2741                                         '{{' . $part1 . '}}' .
2742                                         '<!-- WARNING: template loop detected -->';
2743                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2744                         } else {
2745                                 # set $text to cached message.
2746                                 $text = $linestart . $this->mTemplates[$piece['title']];
2747                         }
2748                 }
2749
2750                 # Load from database
2751                 $lastPathLevel = $this->mTemplatePath;
2752                 if ( !$found ) {
2753                         $ns = NS_TEMPLATE;
2754                         # declaring $subpage directly in the function call
2755                         # does not work correctly with references and breaks
2756                         # {{/subpage}}-style inclusions
2757                         $subpage = '';
2758                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2759                         if ($subpage !== '') {
2760                                 $ns = $this->mTitle->getNamespace();
2761                         }
2762                         $title = Title::newFromText( $part1, $ns );
2763
2764                         if ( !is_null( $title ) ) {
2765                                 if ( !$title->isExternal() ) {
2766                                         # Check for excessive inclusion
2767                                         $dbk = $title->getPrefixedDBkey();
2768                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2769                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->mOutputType != OT_WIKI ) {
2770                                                         $text = SpecialPage::capturePath( $title );
2771                                                         if ( is_string( $text ) ) {
2772                                                                 $found = true;
2773                                                                 $noparse = true;
2774                                                                 $noargs = true;
2775                                                                 $isHTML = true;
2776                                                                 $this->disableCache();
2777                                                         }
2778                                                 } else {
2779                                                         $articleContent = $this->fetchTemplate( $title );
2780                                                         if ( $articleContent !== false ) {
2781                                                                 $found = true;
2782                                                                 $text = $articleContent;
2783                                                                 $replaceHeadings = true;
2784                                                         }
2785                                                 }
2786                                         }
2787
2788                                         # If the title is valid but undisplayable, make a link to it
2789                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2790                                                 $text = '[['.$title->getPrefixedText().']]';
2791                                                 $found = true;
2792                                         }
2793                                 } elseif ( $title->isTrans() ) {
2794                                         // Interwiki transclusion
2795                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2796                                                 $text = $this->interwikiTransclude( $title, 'render' );
2797                                                 $isHTML = true;
2798                                                 $noparse = true;
2799                                         } else {
2800                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2801                                                 $replaceHeadings = true;
2802                                         }
2803                                         $found = true;
2804                                 }
2805
2806                                 # Template cache array insertion
2807                                 # Use the original $piece['title'] not the mangled $part1, so that
2808                                 # modifiers such as RAW: produce separate cache entries
2809                                 if( $found ) {
2810                                         $this->mTemplates[$piece['title']] = $text;
2811                                         $text = $linestart . $text;
2812                                 }
2813                         }
2814                 }
2815
2816                 # Recursive parsing, escaping and link table handling
2817                 # Only for HTML output
2818                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2819                         $text = wfEscapeWikiText( $text );
2820                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2821                         if ( $noargs ) {
2822                                 $assocArgs = array();
2823                         } else {
2824                                 # Clean up argument array
2825                                 $assocArgs = array();
2826                                 $index = 1;
2827                                 foreach( $args as $arg ) {
2828                                         $eqpos = strpos( $arg, '=' );
2829                                         if ( $eqpos === false ) {
2830                                                 $assocArgs[$index++] = $arg;
2831                                         } else {
2832                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2833                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2834                                                 if ( $value === false ) {
2835                                                         $value = '';
2836                                                 }
2837                                                 if ( $name !== false ) {
2838                                                         $assocArgs[$name] = $value;
2839                                                 }
2840                                         }
2841                                 }
2842
2843                                 # Add a new element to the templace recursion path
2844                                 $this->mTemplatePath[$part1] = 1;
2845                         }
2846
2847                         if ( !$noparse ) {
2848                                 # If there are any <onlyinclude> tags, only include them
2849                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2850                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2851                                         $text = '';
2852                                         foreach ($m[1] as $piece)
2853                                                 $text .= $piece;
2854                                 }
2855                                 # Remove <noinclude> sections and <includeonly> tags
2856                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2857                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2858
2859                                 if( $this->mOutputType == OT_HTML ) {
2860                                         # Strip <nowiki>, <pre>, etc.
2861                                         $text = $this->strip( $text, $this->mStripState );
2862                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2863                                 }
2864                                 $text = $this->replaceVariables( $text, $assocArgs );
2865
2866                                 # If the template begins with a table or block-level
2867                                 # element, it should be treated as beginning a new line.
2868                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2869                                         $text = "\n" . $text;
2870                                 }
2871                         } elseif ( !$noargs ) {
2872                                 # $noparse and !$noargs
2873                                 # Just replace the arguments, not any double-brace items
2874                                 # This is used for rendered interwiki transclusion
2875                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2876                         }
2877                 }
2878                 # Prune lower levels off the recursion check path
2879                 $this->mTemplatePath = $lastPathLevel;
2880
2881                 if ( !$found ) {
2882                         wfProfileOut( $fname );
2883                         return $piece['text'];
2884                 } else {
2885                         if ( $isHTML ) {
2886                                 # Replace raw HTML by a placeholder
2887                                 # Add a blank line preceding, to prevent it from mucking up
2888                                 # immediately preceding headings
2889                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2890                         } else {
2891                                 # replace ==section headers==
2892                                 # XXX this needs to go away once we have a better parser.
2893                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2894                                         if( !is_null( $title ) )
2895                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2896                                         else
2897                                                 $encodedname = base64_encode("");
2898                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2899                                                 PREG_SPLIT_DELIM_CAPTURE);
2900                                         $text = '';
2901                                         $nsec = 0;
2902                                         for( $i = 0; $i < count($m); $i += 2 ) {
2903                                                 $text .= $m[$i];
2904                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2905                                                 $hl = $m[$i + 1];
2906                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2907                                                         $text .= $hl;
2908                                                         continue;
2909                                                 }
2910                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2911                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2912                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2913
2914                                                 $nsec++;
2915                                         }
2916                                 }
2917                         }
2918                 }
2919
2920                 # Prune lower levels off the recursion check path
2921                 $this->mTemplatePath = $lastPathLevel;
2922
2923                 if ( !$found ) {
2924                         wfProfileOut( $fname );
2925                         return $piece['text'];
2926                 } else {
2927                         wfProfileOut( $fname );
2928                         return $text;
2929                 }
2930         }
2931
2932         /**
2933          * Fetch the unparsed text of a template and register a reference to it.
2934          */
2935         function fetchTemplate( $title ) {
2936                 $text = false;
2937                 // Loop to fetch the article, with up to 1 redirect
2938                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
2939                         $rev = Revision::newFromTitle( $title );
2940                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
2941                         if ( !$rev ) {
2942                                 break;
2943                         }
2944                         $text = $rev->getText();
2945                         if ( $text === false ) {
2946                                 break;
2947                         }
2948                         // Redirect?
2949                         $title = Title::newFromRedirect( $text );
2950                 }
2951                 return $text;
2952         }
2953
2954         /**
2955          * Transclude an interwiki link.
2956          */
2957         function interwikiTransclude( $title, $action ) {
2958                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
2959
2960                 if (!$wgEnableScaryTranscluding)
2961                         return wfMsg('scarytranscludedisabled');
2962
2963                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
2964                 // But we'll handle it generally anyway
2965                 if ( $title->getNamespace() ) {
2966                         // Use the canonical namespace, which should work anywhere
2967                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
2968                 } else {
2969                         $articleName = $title->getDBkey();
2970                 }
2971
2972                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
2973                 $url .= "?action=$action";
2974                 if (strlen($url) > 255)
2975                         return wfMsg('scarytranscludetoolong');
2976                 return $this->fetchScaryTemplateMaybeFromCache($url);
2977         }
2978
2979         function fetchScaryTemplateMaybeFromCache($url) {
2980                 global $wgTranscludeCacheExpiry;
2981                 $dbr =& wfGetDB(DB_SLAVE);
2982                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2983                                 array('tc_url' => $url));
2984                 if ($obj) {
2985                         $time = $obj->tc_time;
2986                         $text = $obj->tc_contents;
2987                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
2988                                 return $text;
2989                         }
2990                 }
2991
2992                 $text = wfGetHTTP($url);
2993                 if (!$text)
2994                         return wfMsg('scarytranscludefailed', $url);
2995
2996                 $dbw =& wfGetDB(DB_MASTER);
2997                 $dbw->replace('transcache', array('tc_url'), array(
2998                         'tc_url' => $url,
2999                         'tc_time' => time(),
3000                         'tc_contents' => $text));
3001                 return $text;
3002         }
3003
3004
3005         /**
3006          * Triple brace replacement -- used for template arguments
3007          * @private
3008          */
3009         function argSubstitution( $matches ) {
3010                 $arg = trim( $matches['title'] );
3011                 $text = $matches['text'];
3012                 $inputArgs = end( $this->mArgStack );
3013
3014                 if ( array_key_exists( $arg, $inputArgs ) ) {
3015                         $text = $inputArgs[$arg];
3016                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
3017                         $text = $matches['parts'][0];
3018                 }
3019
3020                 return $text;
3021         }
3022
3023         /**
3024          * Returns true if the function is allowed to include this entity
3025          * @private
3026          */
3027         function incrementIncludeCount( $dbk ) {
3028                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
3029                         $this->mIncludeCount[$dbk] = 0;
3030                 }
3031                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
3032                         return true;
3033                 } else {
3034                         return false;
3035                 }
3036         }
3037
3038         /**
3039          * This function accomplishes several tasks:
3040          * 1) Auto-number headings if that option is enabled
3041          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3042          * 3) Add a Table of contents on the top for users who have enabled the option
3043          * 4) Auto-anchor headings
3044          *
3045          * It loops through all headlines, collects the necessary data, then splits up the
3046          * string and re-inserts the newly formatted headlines.
3047          *
3048          * @param string $text
3049          * @param boolean $isMain
3050          * @private
3051          */
3052         function formatHeadings( $text, $isMain=true ) {
3053                 global $wgMaxTocLevel, $wgContLang;
3054
3055                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3056                 $doShowToc = true;
3057                 $forceTocHere = false;
3058                 if( !$this->mTitle->userCanEdit() ) {
3059                         $showEditLink = 0;
3060                 } else {
3061                         $showEditLink = $this->mOptions->getEditSection();
3062                 }
3063
3064                 # Inhibit editsection links if requested in the page
3065                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
3066                 if( $esw->matchAndRemove( $text ) ) {
3067                         $showEditLink = 0;
3068                 }
3069                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3070                 # do not add TOC
3071                 $mw =& MagicWord::get( MAG_NOTOC );
3072                 if( $mw->matchAndRemove( $text ) ) {
3073                         $doShowToc = false;
3074                 }
3075
3076                 # Get all headlines for numbering them and adding funky stuff like [edit]
3077                 # links - this is for later, but we need the number of headlines right now
3078                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3079
3080                 # if there are fewer than 4 headlines in the article, do not show TOC
3081                 if( $numMatches < 4 ) {
3082                         $doShowToc = false;
3083                 }
3084
3085                 # Allow user to stipulate that a page should have a "new section"
3086                 # link added via __NEWSECTIONLINK__
3087                 $mw =& MagicWord::get( MAG_NEWSECTIONLINK );
3088                 if( $mw->matchAndRemove( $text ) )
3089                         $this->mOutput->setNewSection( true );
3090
3091                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
3092                 # override above conditions and always show TOC at that place
3093
3094                 $mw =& MagicWord::get( MAG_TOC );
3095                 if($mw->match( $text ) ) {
3096                         $doShowToc = true;
3097                         $forceTocHere = true;
3098                 } else {
3099                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3100                         # override above conditions and always show TOC above first header
3101                         $mw =& MagicWord::get( MAG_FORCETOC );
3102                         if ($mw->matchAndRemove( $text ) ) {
3103                                 $doShowToc = true;
3104                         }
3105                 }
3106
3107                 # Never ever show TOC if no headers
3108                 if( $numMatches < 1 ) {
3109                         $doShowToc = false;
3110                 }
3111
3112                 # We need this to perform operations on the HTML
3113                 $sk =& $this->mOptions->getSkin();
3114
3115                 # headline counter
3116                 $headlineCount = 0;
3117                 $sectionCount = 0; # headlineCount excluding template sections
3118
3119                 # Ugh .. the TOC should have neat indentation levels which can be
3120                 # passed to the skin functions. These are determined here
3121                 $toc = '';
3122                 $full = '';
3123                 $head = array();
3124                 $sublevelCount = array();
3125                 $levelCount = array();
3126                 $toclevel = 0;
3127                 $level = 0;
3128                 $prevlevel = 0;
3129                 $toclevel = 0;
3130                 $prevtoclevel = 0;
3131
3132                 foreach( $matches[3] as $headline ) {
3133                         $istemplate = 0;
3134                         $templatetitle = '';
3135                         $templatesection = 0;
3136                         $numbering = '';
3137
3138                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3139                                 $istemplate = 1;
3140                                 $templatetitle = base64_decode($mat[1]);
3141                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3142                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3143                         }
3144
3145                         if( $toclevel ) {
3146                                 $prevlevel = $level;
3147                                 $prevtoclevel = $toclevel;
3148                         }
3149                         $level = $matches[1][$headlineCount];
3150
3151                         if( $doNumberHeadings || $doShowToc ) {
3152
3153                                 if ( $level > $prevlevel ) {
3154                                         # Increase TOC level
3155                                         $toclevel++;
3156                                         $sublevelCount[$toclevel] = 0;
3157                                         if( $toclevel<$wgMaxTocLevel ) {
3158                                                 $toc .= $sk->tocIndent();
3159                                         }
3160                                 }
3161                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3162                                         # Decrease TOC level, find level to jump to
3163
3164                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3165                                                 # Can only go down to level 1
3166                                                 $toclevel = 1;
3167                                         } else {
3168                                                 for ($i = $toclevel; $i > 0; $i--) {
3169                                                         if ( $levelCount[$i] == $level ) {
3170                                                                 # Found last matching level
3171                                                                 $toclevel = $i;
3172                                                                 break;
3173                                                         }
3174                                                         elseif ( $levelCount[$i] < $level ) {
3175                                                                 # Found first matching level below current level
3176                                                                 $toclevel = $i + 1;
3177                                                                 break;
3178                                                         }
3179                                                 }
3180                                         }
3181                                         if( $toclevel<$wgMaxTocLevel ) {
3182                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3183                                         }
3184                                 }
3185                                 else {
3186                                         # No change in level, end TOC line
3187                                         if( $toclevel<$wgMaxTocLevel ) {
3188                                                 $toc .= $sk->tocLineEnd();
3189                                         }
3190                                 }
3191
3192                                 $levelCount[$toclevel] = $level;
3193
3194                                 # count number of headlines for each level
3195                                 @$sublevelCount[$toclevel]++;
3196                                 $dot = 0;
3197                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3198                                         if( !empty( $sublevelCount[$i] ) ) {
3199                                                 if( $dot ) {
3200                                                         $numbering .= '.';
3201                                                 }
3202                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3203                                                 $dot = 1;
3204                                         }
3205                                 }
3206                         }
3207
3208                         # The canonized header is a version of the header text safe to use for links
3209                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3210                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3211                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3212
3213                         # Remove link placeholders by the link text.
3214                         #     <!--LINK number-->
3215                         # turns into
3216                         #     link text with suffix
3217                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3218                                                             "\$this->mLinkHolders['texts'][\$1]",
3219                                                             $canonized_headline );
3220                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3221                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3222                                                             $canonized_headline );
3223
3224                         # strip out HTML
3225                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3226                         $tocline = trim( $canonized_headline );
3227                         # Save headline for section edit hint before it's escaped
3228                         $headline_hint = trim( $canonized_headline );
3229                         $canonized_headline = Sanitizer::escapeId( $tocline );
3230                         $refers[$headlineCount] = $canonized_headline;
3231
3232                         # count how many in assoc. array so we can track dupes in anchors
3233                         @$refers[$canonized_headline]++;
3234                         $refcount[$headlineCount]=$refers[$canonized_headline];
3235
3236                         # Don't number the heading if it is the only one (looks silly)
3237                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3238                                 # the two are different if the line contains a link
3239                                 $headline=$numbering . ' ' . $headline;
3240                         }
3241
3242                         # Create the anchor for linking from the TOC to the section
3243                         $anchor = $canonized_headline;
3244                         if($refcount[$headlineCount] > 1 ) {
3245                                 $anchor .= '_' . $refcount[$headlineCount];
3246                         }
3247                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3248                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3249                         }
3250                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3251                                 if ( empty( $head[$headlineCount] ) ) {
3252                                         $head[$headlineCount] = '';
3253                                 }
3254                                 if( $istemplate )
3255                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3256                                 else
3257                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3258                         }
3259
3260                         # give headline the correct <h#> tag
3261                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3262
3263                         $headlineCount++;
3264                         if( !$istemplate )
3265                                 $sectionCount++;
3266                 }
3267
3268                 if( $doShowToc ) {
3269                         if( $toclevel<$wgMaxTocLevel ) {
3270                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3271                         }
3272                         $toc = $sk->tocList( $toc );
3273                 }
3274
3275                 # split up and insert constructed headlines
3276
3277                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3278                 $i = 0;
3279
3280                 foreach( $blocks as $block ) {
3281                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3282                                 # This is the [edit] link that appears for the top block of text when
3283                                 # section editing is enabled
3284
3285                                 # Disabled because it broke block formatting
3286                                 # For example, a bullet point in the top line
3287                                 # $full .= $sk->editSectionLink(0);
3288                         }
3289                         $full .= $block;
3290                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
3291                         # Top anchor now in skin
3292                                 $full = $full.$toc;
3293                         }
3294
3295                         if( !empty( $head[$i] ) ) {
3296                                 $full .= $head[$i];
3297                         }
3298                         $i++;
3299                 }
3300                 if($forceTocHere) {
3301                         $mw =& MagicWord::get( MAG_TOC );
3302                         return $mw->replace( $toc, $full );
3303                 } else {
3304                         return $full;
3305                 }
3306         }
3307
3308         /**
3309          * Return an HTML link for the "ISBN 123456" text
3310          * @private
3311          */
3312         function magicISBN( $text ) {
3313                 $fname = 'Parser::magicISBN';
3314                 wfProfileIn( $fname );
3315
3316                 $a = split( 'ISBN ', ' '.$text );
3317                 if ( count ( $a ) < 2 ) {
3318                         wfProfileOut( $fname );
3319                         return $text;
3320                 }
3321                 $text = substr( array_shift( $a ), 1);
3322                 $valid = '0123456789-Xx';
3323
3324                 foreach ( $a as $x ) {
3325                         # hack: don't replace inside thumbnail title/alt
3326                         # attributes
3327                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3328                                 $text .= "ISBN $x";
3329                                 continue;
3330                         }
3331
3332                         $isbn = $blank = '' ;
3333                         while ( ' ' == $x{0} ) {
3334                                 $blank .= ' ';
3335                                 $x = substr( $x, 1 );
3336                         }
3337                         if ( $x == '' ) { # blank isbn
3338                                 $text .= "ISBN $blank";
3339                                 continue;
3340                         }
3341                         while ( strstr( $valid, $x{0} ) != false ) {
3342                                 $isbn .= $x{0};
3343                                 $x = substr( $x, 1 );
3344                         }
3345                         $num = str_replace( '-', '', $isbn );
3346                         $num = str_replace( ' ', '', $num );
3347                         $num = str_replace( 'x', 'X', $num );
3348
3349                         if ( '' == $num ) {
3350                                 $text .= "ISBN $blank$x";
3351                         } else {
3352                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3353                                 $text .= '<a href="' .
3354                                         $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3355                                         "\" class=\"internal\">ISBN $isbn</a>";
3356                                 $text .= $x;
3357                         }
3358                 }
3359                 wfProfileOut( $fname );
3360                 return $text;
3361         }
3362
3363         /**
3364          * Return an HTML link for the "RFC 1234" text
3365          *
3366          * @private
3367          * @param string $text     Text to be processed
3368          * @param string $keyword  Magic keyword to use (default RFC)
3369          * @param string $urlmsg   Interface message to use (default rfcurl)
3370          * @return string
3371          */
3372         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3373
3374                 $valid = '0123456789';
3375                 $internal = false;
3376
3377                 $a = split( $keyword, ' '.$text );
3378                 if ( count ( $a ) < 2 ) {
3379                         return $text;
3380                 }
3381                 $text = substr( array_shift( $a ), 1);
3382
3383                 /* Check if keyword is preceed by [[.
3384                  * This test is made here cause of the array_shift above
3385                  * that prevent the test to be done in the foreach.
3386                  */
3387                 if ( substr( $text, -2 ) == '[[' ) {
3388                         $internal = true;
3389                 }
3390
3391                 foreach ( $a as $x ) {
3392                         /* token might be empty if we have RFC RFC 1234 */
3393                         if ( $x=='' ) {
3394                                 $text.=$keyword;
3395                                 continue;
3396                                 }
3397
3398                         # hack: don't replace inside thumbnail title/alt
3399                         # attributes
3400                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3401                                 $text .= $keyword . $x;
3402                                 continue;
3403                         }
3404
3405                         $id = $blank = '' ;
3406
3407                         /** remove and save whitespaces in $blank */
3408                         while ( $x{0} == ' ' ) {
3409                                 $blank .= ' ';
3410                                 $x = substr( $x, 1 );
3411                         }
3412
3413                         /** remove and save the rfc number in $id */
3414                         while ( strstr( $valid, $x{0} ) != false ) {
3415                                 $id .= $x{0};
3416                                 $x = substr( $x, 1 );
3417                         }
3418
3419                         if ( $id == '' ) {
3420                                 /* call back stripped spaces*/
3421                                 $text .= $keyword.$blank.$x;
3422                         } elseif( $internal ) {
3423                                 /* normal link */
3424                                 $text .= $keyword.$id.$x;
3425                         } else {
3426                                 /* build the external link*/
3427                                 $url = wfMsg( $urlmsg, $id);
3428                                 $sk =& $this->mOptions->getSkin();
3429                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3430                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3431                         }
3432
3433                         /* Check if the next RFC keyword is preceed by [[ */
3434                         $internal = ( substr($x,-2) == '[[' );
3435                 }
3436                 return $text;
3437         }
3438
3439         /**
3440          * Transform wiki markup when saving a page by doing \r\n -> \n
3441          * conversion, substitting signatures, {{subst:}} templates, etc.
3442          *
3443          * @param string $text the text to transform
3444          * @param Title &$title the Title object for the current article
3445          * @param User &$user the User object describing the current user
3446          * @param ParserOptions $options parsing options
3447          * @param bool $clearState whether to clear the parser state first
3448          * @return string the altered wiki markup
3449          * @public
3450          */
3451         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3452                 $this->mOptions = $options;
3453                 $this->mTitle =& $title;
3454                 $this->mOutputType = OT_WIKI;
3455
3456                 if ( $clearState ) {
3457                         $this->clearState();
3458                 }
3459
3460                 $stripState = false;
3461                 $pairs = array(
3462                         "\r\n" => "\n",
3463                 );
3464                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3465                 $text = $this->strip( $text, $stripState, true );
3466                 $text = $this->pstPass2( $text, $stripState, $user );
3467                 $text = $this->unstrip( $text, $stripState );
3468                 $text = $this->unstripNoWiki( $text, $stripState );
3469                 return $text;
3470         }
3471
3472         /**
3473          * Pre-save transform helper function
3474          * @private
3475          */
3476         function pstPass2( $text, &$stripState, &$user ) {
3477                 global $wgContLang, $wgLocaltimezone;
3478
3479                 /* Note: This is the timestamp saved as hardcoded wikitext to
3480                  * the database, we use $wgContLang here in order to give
3481                  * everyone the same signature and use the default one rather
3482                  * than the one selected in each user's preferences.
3483                  */
3484                 if ( isset( $wgLocaltimezone ) ) {
3485                         $oldtz = getenv( 'TZ' );
3486                         putenv( 'TZ='.$wgLocaltimezone );
3487                 }
3488                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3489                   ' (' . date( 'T' ) . ')';
3490                 if ( isset( $wgLocaltimezone ) ) {
3491                         putenv( 'TZ='.$oldtz );
3492                 }
3493
3494                 # Variable replacement
3495                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3496                 $text = $this->replaceVariables( $text );
3497
3498                 # Strip out <nowiki> etc. added via replaceVariables
3499                 $text = $this->strip( $text, $stripState );
3500
3501                 # Signatures
3502                 $sigText = $this->getUserSig( $user );
3503                 $text = strtr( $text, array(
3504                         '~~~~~' => $d,
3505                         '~~~~' => "$sigText $d",
3506                         '~~~' => $sigText
3507                 ) );
3508
3509                 # Context links: [[|name]] and [[name (context)|]]
3510                 #
3511                 global $wgLegalTitleChars;
3512                 $tc = "[$wgLegalTitleChars]";
3513                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3514
3515                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3516                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3517
3518                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3519                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3520                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3521                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3522                 $context = '';
3523                 $t = $this->mTitle->getText();
3524                 if ( preg_match( $conpat, $t, $m ) ) {
3525                         $context = $m[2];
3526                 }
3527                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3528                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3529                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3530
3531                 if ( '' == $context ) {
3532                         $text = preg_replace( $p2, '[[\\1]]', $text );
3533                 } else {
3534                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3535                 }
3536
3537                 # Trim trailing whitespace
3538                 # MAG_END (__END__) tag allows for trailing
3539                 # whitespace to be deliberately included
3540                 $text = rtrim( $text );
3541                 $mw =& MagicWord::get( MAG_END );
3542                 $mw->matchAndRemove( $text );
3543
3544                 return $text;
3545         }
3546
3547         /**
3548          * Fetch the user's signature text, if any, and normalize to
3549          * validated, ready-to-insert wikitext.
3550          *
3551          * @param User $user
3552          * @return string
3553          * @private
3554          */
3555         function getUserSig( &$user ) {
3556                 $username = $user->getName();
3557                 $nickname = $user->getOption( 'nickname' );
3558                 $nickname = $nickname === '' ? $username : $nickname;
3559
3560                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3561                         # Sig. might contain markup; validate this
3562                         if( $this->validateSig( $nickname ) !== false ) {
3563                                 # Validated; clean up (if needed) and return it
3564                                 return $this->cleanSig( $nickname, true );
3565                         } else {
3566                                 # Failed to validate; fall back to the default
3567                                 $nickname = $username;
3568                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3569                         }
3570                 }
3571
3572                 # If we're still here, make it a link to the user page
3573                 $userpage = $user->getUserPage();
3574                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3575         }
3576
3577         /**
3578          * Check that the user's signature contains no bad XML
3579          *
3580          * @param string $text
3581          * @return mixed An expanded string, or false if invalid.
3582          */
3583         function validateSig( $text ) {
3584                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3585         }
3586
3587         /**
3588          * Clean up signature text
3589          *
3590          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3591          * 2) Substitute all transclusions
3592          *
3593          * @param string $text
3594          * @param $parsing Whether we're cleaning (preferences save) or parsing
3595          * @return string Signature text
3596          */
3597         function cleanSig( $text, $parsing = false ) {
3598                 global $wgTitle;
3599                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3600
3601                 $substWord = MagicWord::get( MAG_SUBST );
3602                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3603                 $substText = '{{' . $substWord->getSynonym( 0 );
3604
3605                 $text = preg_replace( $substRegex, $substText, $text );
3606                 $text = preg_replace( '/~{3,5}/', '', $text );
3607                 $text = $this->replaceVariables( $text );
3608
3609                 $this->clearState();
3610                 return $text;
3611         }
3612
3613         /**
3614          * Set up some variables which are usually set up in parse()
3615          * so that an external function can call some class members with confidence
3616          * @public
3617          */
3618         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3619                 $this->mTitle =& $title;
3620                 $this->mOptions = $options;
3621                 $this->mOutputType = $outputType;
3622                 if ( $clearState ) {
3623                         $this->clearState();
3624                 }
3625         }
3626
3627         /**
3628          * Transform a MediaWiki message by replacing magic variables.
3629          *
3630          * @param string $text the text to transform
3631          * @param ParserOptions $options  options
3632          * @return string the text with variables substituted
3633          * @public
3634          */
3635         function transformMsg( $text, $options ) {
3636                 global $wgTitle;
3637                 static $executing = false;
3638
3639                 $fname = "Parser::transformMsg";
3640
3641                 # Guard against infinite recursion
3642                 if ( $executing ) {
3643                         return $text;
3644                 }
3645                 $executing = true;
3646
3647                 wfProfileIn($fname);
3648
3649                 $this->mTitle = $wgTitle;
3650                 $this->mOptions = $options;
3651                 $this->mOutputType = OT_MSG;
3652                 $this->clearState();
3653                 $text = $this->replaceVariables( $text );
3654
3655                 $executing = false;
3656                 wfProfileOut($fname);
3657                 return $text;
3658         }
3659
3660         /**
3661          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3662          * The callback should have the following form:
3663          *    function myParserHook( $text, $params, &$parser ) { ... }
3664          *
3665          * Transform and return $text. Use $parser for any required context, e.g. use
3666          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3667          *
3668          * @public
3669          *
3670          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3671          * @param mixed $callback The callback function (and object) to use for the tag
3672          *
3673          * @return The old value of the mTagHooks array associated with the hook
3674          */
3675         function setHook( $tag, $callback ) {
3676                 $oldVal = @$this->mTagHooks[$tag];
3677                 $this->mTagHooks[$tag] = $callback;
3678
3679                 return $oldVal;
3680         }
3681
3682         /**
3683          * Create a function, e.g. {{sum:1|2|3}}
3684          * The callback function should have the form:
3685          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3686          *
3687          * The callback may either return the text result of the function, or an array with the text
3688          * in element 0, and a number of flags in the other elements. The names of the flags are
3689          * specified in the keys. Valid flags are:
3690          *   found                     The text returned is valid, stop processing the template. This
3691          *                             is on by default.
3692          *   nowiki                    Wiki markup in the return value should be escaped
3693          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3694          *   noargs                    Don't replace triple-brace arguments in the return value
3695          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3696          *
3697          * @public
3698          *
3699          * @param string $name The function name. Function names are case-insensitive.
3700          * @param mixed $callback The callback function (and object) to use
3701          *
3702          * @return The old callback function for this name, if any
3703          */
3704         function setFunctionHook( $name, $callback ) {
3705                 $name = strtolower( $name );
3706                 $oldVal = @$this->mFunctionHooks[$name];
3707                 $this->mFunctionHooks[$name] = $callback;
3708                 return $oldVal;
3709         }
3710
3711         /**
3712          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3713          * Placeholders created in Skin::makeLinkObj()
3714          * Returns an array of links found, indexed by PDBK:
3715          *  0 - broken
3716          *  1 - normal link
3717          *  2 - stub
3718          * $options is a bit field, RLH_FOR_UPDATE to select for update
3719          */
3720         function replaceLinkHolders( &$text, $options = 0 ) {
3721                 global $wgUser;
3722                 global $wgOutputReplace;
3723
3724                 $fname = 'Parser::replaceLinkHolders';
3725                 wfProfileIn( $fname );
3726
3727                 $pdbks = array();
3728                 $colours = array();
3729                 $sk =& $this->mOptions->getSkin();
3730                 $linkCache =& LinkCache::singleton();
3731
3732                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3733                         wfProfileIn( $fname.'-check' );
3734                         $dbr =& wfGetDB( DB_SLAVE );
3735                         $page = $dbr->tableName( 'page' );
3736                         $threshold = $wgUser->getOption('stubthreshold');
3737
3738                         # Sort by namespace
3739                         asort( $this->mLinkHolders['namespaces'] );
3740
3741                         # Generate query
3742                         $query = false;
3743                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3744                                 # Make title object
3745                                 $title = $this->mLinkHolders['titles'][$key];
3746
3747                                 # Skip invalid entries.
3748                                 # Result will be ugly, but prevents crash.
3749                                 if ( is_null( $title ) ) {
3750                                         continue;
3751                                 }
3752                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3753
3754                                 # Check if it's a static known link, e.g. interwiki
3755                                 if ( $title->isAlwaysKnown() ) {
3756                                         $colours[$pdbk] = 1;
3757                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3758                                         $colours[$pdbk] = 1;
3759                                         $this->mOutput->addLink( $title, $id );
3760                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3761                                         $colours[$pdbk] = 0;
3762                                 } else {
3763                                         # Not in the link cache, add it to the query
3764                                         if ( !isset( $current ) ) {
3765                                                 $current = $ns;
3766                                                 $query =  "SELECT page_id, page_namespace, page_title";
3767                                                 if ( $threshold > 0 ) {
3768                                                         $query .= ', page_len, page_is_redirect';
3769                                                 }
3770                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3771                                         } elseif ( $current != $ns ) {
3772                                                 $current = $ns;
3773                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3774                                         } else {
3775                                                 $query .= ', ';
3776                                         }
3777
3778                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3779                                 }
3780                         }
3781                         if ( $query ) {
3782                                 $query .= '))';
3783                                 if ( $options & RLH_FOR_UPDATE ) {
3784                                         $query .= ' FOR UPDATE';
3785                                 }
3786
3787                                 $res = $dbr->query( $query, $fname );
3788
3789                                 # Fetch data and form into an associative array
3790                                 # non-existent = broken
3791                                 # 1 = known
3792                                 # 2 = stub
3793                                 while ( $s = $dbr->fetchObject($res) ) {
3794                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3795                                         $pdbk = $title->getPrefixedDBkey();
3796                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3797                                         $this->mOutput->addLink( $title, $s->page_id );
3798
3799                                         if ( $threshold >  0 ) {
3800                                                 $size = $s->page_len;
3801                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3802                                                         $colours[$pdbk] = 1;
3803                                                 } else {
3804                                                         $colours[$pdbk] = 2;
3805                                                 }
3806                                         } else {
3807                                                 $colours[$pdbk] = 1;
3808                                         }
3809                                 }
3810                         }
3811                         wfProfileOut( $fname.'-check' );
3812
3813                         # Construct search and replace arrays
3814                         wfProfileIn( $fname.'-construct' );
3815                         $wgOutputReplace = array();
3816                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3817                                 $pdbk = $pdbks[$key];
3818                                 $searchkey = "<!--LINK $key-->";
3819                                 $title = $this->mLinkHolders['titles'][$key];
3820                                 if ( empty( $colours[$pdbk] ) ) {
3821                                         $linkCache->addBadLinkObj( $title );
3822                                         $colours[$pdbk] = 0;
3823                                         $this->mOutput->addLink( $title, 0 );
3824                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3825                                                                         $this->mLinkHolders['texts'][$key],
3826                                                                         $this->mLinkHolders['queries'][$key] );
3827                                 } elseif ( $colours[$pdbk] == 1 ) {
3828                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3829                                                                         $this->mLinkHolders['texts'][$key],
3830                                                                         $this->mLinkHolders['queries'][$key] );
3831                                 } elseif ( $colours[$pdbk] == 2 ) {
3832                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3833                                                                         $this->mLinkHolders['texts'][$key],
3834                                                                         $this->mLinkHolders['queries'][$key] );
3835                                 }
3836                         }
3837                         wfProfileOut( $fname.'-construct' );
3838
3839                         # Do the thing
3840                         wfProfileIn( $fname.'-replace' );
3841
3842                         $text = preg_replace_callback(
3843                                 '/(<!--LINK .*?-->)/',
3844                                 "wfOutputReplaceMatches",
3845                                 $text);
3846
3847                         wfProfileOut( $fname.'-replace' );
3848                 }
3849
3850                 # Now process interwiki link holders
3851                 # This is quite a bit simpler than internal links
3852                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3853                         wfProfileIn( $fname.'-interwiki' );
3854                         # Make interwiki link HTML
3855                         $wgOutputReplace = array();
3856                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3857                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3858                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3859                         }
3860
3861                         $text = preg_replace_callback(
3862                                 '/<!--IWLINK (.*?)-->/',
3863                                 "wfOutputReplaceMatches",
3864                                 $text );
3865                         wfProfileOut( $fname.'-interwiki' );
3866                 }
3867
3868                 wfProfileOut( $fname );
3869                 return $colours;
3870         }
3871
3872         /**
3873          * Replace <!--LINK--> link placeholders with plain text of links
3874          * (not HTML-formatted).
3875          * @param string $text
3876          * @return string
3877          */
3878         function replaceLinkHoldersText( $text ) {
3879                 $fname = 'Parser::replaceLinkHoldersText';
3880                 wfProfileIn( $fname );
3881
3882                 $text = preg_replace_callback(
3883                         '/<!--(LINK|IWLINK) (.*?)-->/',
3884                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3885                         $text );
3886
3887                 wfProfileOut( $fname );
3888                 return $text;
3889         }
3890
3891         /**
3892          * @param array $matches
3893          * @return string
3894          * @private
3895          */
3896         function replaceLinkHoldersTextCallback( $matches ) {
3897                 $type = $matches[1];
3898                 $key  = $matches[2];
3899                 if( $type == 'LINK' ) {
3900                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3901                                 return $this->mLinkHolders['texts'][$key];
3902                         }
3903                 } elseif( $type == 'IWLINK' ) {
3904                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3905                                 return $this->mInterwikiLinkHolders['texts'][$key];
3906                         }
3907                 }
3908                 return $matches[0];
3909         }
3910
3911         /**
3912          * Renders an image gallery from a text with one line per image.
3913          * text labels may be given by using |-style alternative text. E.g.
3914          *   Image:one.jpg|The number "1"
3915          *   Image:tree.jpg|A tree
3916          * given as text will return the HTML of a gallery with two images,
3917          * labeled 'The number "1"' and
3918          * 'A tree'.
3919          */
3920         function renderImageGallery( $text ) {
3921                 # Setup the parser
3922                 $parserOptions = new ParserOptions;
3923                 $localParser = new Parser();
3924
3925                 $ig = new ImageGallery();
3926                 $ig->setShowBytes( false );
3927                 $ig->setShowFilename( false );
3928                 $lines = explode( "\n", $text );
3929
3930                 foreach ( $lines as $line ) {
3931                         # match lines like these:
3932                         # Image:someimage.jpg|This is some image
3933                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3934                         # Skip empty lines
3935                         if ( count( $matches ) == 0 ) {
3936                                 continue;
3937                         }
3938                         $nt =& Title::newFromText( $matches[1] );
3939                         if( is_null( $nt ) ) {
3940                                 # Bogus title. Ignore these so we don't bomb out later.
3941                                 continue;
3942                         }
3943                         if ( isset( $matches[3] ) ) {
3944                                 $label = $matches[3];
3945                         } else {
3946                                 $label = '';
3947                         }
3948
3949                         $pout = $localParser->parse( $label , $this->mTitle, $parserOptions );
3950                         $html = $pout->getText();
3951
3952                         $ig->add( new Image( $nt ), $html );
3953
3954                         # Only add real images (bug #5586)
3955                         if ( $nt->getNamespace() == NS_IMAGE ) {
3956                                 $this->mOutput->addImage( $nt->getDBkey() );
3957                         }
3958                 }
3959                 return $ig->toHTML();
3960         }
3961
3962         /**
3963          * Parse image options text and use it to make an image
3964          */
3965         function makeImage( &$nt, $options ) {
3966                 global $wgUseImageResize;
3967
3968                 $align = '';
3969
3970                 # Check if the options text is of the form "options|alt text"
3971                 # Options are:
3972                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3973                 #  * left               no resizing, just left align. label is used for alt= only
3974                 #  * right              same, but right aligned
3975                 #  * none               same, but not aligned
3976                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3977                 #  * center             center the image
3978                 #  * framed             Keep original image size, no magnify-button.
3979
3980                 $part = explode( '|', $options);
3981
3982                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3983                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3984                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3985                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3986                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3987                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3988                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3989                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3990                 $caption = '';
3991
3992                 $width = $height = $framed = $thumb = false;
3993                 $manual_thumb = '' ;
3994
3995                 foreach( $part as $key => $val ) {
3996                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3997                                 $thumb=true;
3998                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3999                                 # use manually specified thumbnail
4000                                 $thumb=true;
4001                                 $manual_thumb = $match;
4002                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
4003                                 # remember to set an alignment, don't render immediately
4004                                 $align = 'right';
4005                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
4006                                 # remember to set an alignment, don't render immediately
4007                                 $align = 'left';
4008                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
4009                                 # remember to set an alignment, don't render immediately
4010                                 $align = 'center';
4011                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
4012                                 # remember to set an alignment, don't render immediately
4013                                 $align = 'none';
4014                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4015                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
4016                                 # $match is the image width in pixels
4017                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4018                                         $width = intval( $m[1] );
4019                                         $height = intval( $m[2] );
4020                                 } else {
4021                                         $width = intval($match);
4022                                 }
4023                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4024                                 $framed=true;
4025                         } else {
4026                                 $caption = $val;
4027                         }
4028                 }
4029                 # Strip bad stuff out of the alt text
4030                 $alt = $this->replaceLinkHoldersText( $caption );
4031
4032                 # make sure there are no placeholders in thumbnail attributes
4033                 # that are later expanded to html- so expand them now and
4034                 # remove the tags
4035                 $alt = $this->unstrip($alt, $this->mStripState);
4036                 $alt = Sanitizer::stripAllTags( $alt );
4037
4038                 # Linker does the rest
4039                 $sk =& $this->mOptions->getSkin();
4040                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
4041         }
4042
4043         /**
4044          * Set a flag in the output object indicating that the content is dynamic and
4045          * shouldn't be cached.
4046          */
4047         function disableCache() {
4048                 $this->mOutput->mCacheTime = -1;
4049         }
4050
4051         /**#@+
4052          * Callback from the Sanitizer for expanding items found in HTML attribute
4053          * values, so they can be safely tested and escaped.
4054          * @param string $text
4055          * @param array $args
4056          * @return string
4057          * @private
4058          */
4059         function attributeStripCallback( &$text, $args ) {
4060                 $text = $this->replaceVariables( $text, $args );
4061                 $text = $this->unstripForHTML( $text );
4062                 return $text;
4063         }
4064
4065         function unstripForHTML( $text ) {
4066                 $text = $this->unstrip( $text, $this->mStripState );
4067                 $text = $this->unstripNoWiki( $text, $this->mStripState );
4068                 return $text;
4069         }
4070         /**#@-*/
4071
4072         /**#@+
4073          * Accessor/mutator
4074          */
4075         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4076         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4077         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4078         /**#@-*/
4079
4080         /**#@+
4081          * Accessor
4082          */
4083         function getTags() { return array_keys( $this->mTagHooks ); }
4084         /**#@-*/
4085 }
4086
4087 /**
4088  * @todo document
4089  * @package MediaWiki
4090  */
4091 class ParserOutput
4092 {
4093         private
4094                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4095                 $mCategories,       # Map of category names to sort keys
4096                 $mExternalLinks,    # External link URLs, in the key only
4097                 $mImages,           # DB keys of the images used, in the array key only
4098                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4099                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4100                 $mNewSection,           # Show a new section link?
4101                 $mSubtitle,                     # Additional subtitle
4102                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4103                 $mText,             # The output text
4104                 $mTitleText,        # title text of the chosen language variant
4105                 $mVersion ;         # Compatibility check
4106
4107         /** @todo FIXME should those be public ? */
4108         public
4109                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4110                 $mHTMLtitle ;           # Display HTML title
4111
4112         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4113                 $containsOldMagic = false, $titletext = '' )
4114         {
4115                 $this->mText = $text;
4116                 $this->mLanguageLinks = $languageLinks;
4117                 $this->mCategories = $categoryLinks;
4118                 $this->mContainsOldMagic = $containsOldMagic;
4119                 $this->mCacheTime = '';
4120                 $this->mVersion = MW_PARSER_VERSION;
4121                 $this->mTitleText = $titletext;
4122                 $this->mLinks = array();
4123                 $this->mTemplates = array();
4124                 $this->mImages = array();
4125                 $this->mExternalLinks = array();
4126                 $this->mHTMLtitle = "" ;
4127                 $this->mSubtitle = "" ;
4128                 $this->mNewSection = false;
4129         }
4130
4131         function getText()                   { return $this->mText; }
4132         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4133         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4134         function &getCategories()            { return $this->mCategories; }
4135         function getCacheTime()              { return $this->mCacheTime; }
4136         function getTitleText()              { return $this->mTitleText; }
4137         function &getLinks()                 { return $this->mLinks; }
4138         function &getTemplates()             { return $this->mTemplates; }
4139         function &getImages()                { return $this->mImages; }
4140         function &getExternalLinks()         { return $this->mExternalLinks; }
4141
4142         function containsOldMagic()          { return $this->mContainsOldMagic; }
4143         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4144         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4145         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4146         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4147         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4148         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
4149
4150         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4151         function addImage( $name )           { $this->mImages[$name] = 1; }
4152         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4153         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4154
4155         function setNewSection( $value ) {
4156                 $this->mNewSection = (bool)$value;
4157         }
4158         function getNewSection() {
4159                 return (bool)$this->mNewSection;
4160         }
4161
4162         function addLink( $title, $id ) {
4163                 $ns = $title->getNamespace();
4164                 $dbk = $title->getDBkey();
4165                 if ( !isset( $this->mLinks[$ns] ) ) {
4166                         $this->mLinks[$ns] = array();
4167                 }
4168                 $this->mLinks[$ns][$dbk] = $id;
4169         }
4170
4171         function addTemplate( $title, $id ) {
4172                 $ns = $title->getNamespace();
4173                 $dbk = $title->getDBkey();
4174                 if ( !isset( $this->mTemplates[$ns] ) ) {
4175                         $this->mTemplates[$ns] = array();
4176                 }
4177                 $this->mTemplates[$ns][$dbk] = $id;
4178         }
4179
4180         /**
4181          * Return true if this cached output object predates the global or
4182          * per-article cache invalidation timestamps, or if it comes from
4183          * an incompatible older version.
4184          *
4185          * @param string $touched the affected article's last touched timestamp
4186          * @return bool
4187          * @public
4188          */
4189         function expired( $touched ) {
4190                 global $wgCacheEpoch;
4191                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4192                        $this->getCacheTime() < $touched ||
4193                        $this->getCacheTime() <= $wgCacheEpoch ||
4194                        !isset( $this->mVersion ) ||
4195                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4196         }
4197 }
4198
4199 /**
4200  * Set options of the Parser
4201  * @todo document
4202  * @package MediaWiki
4203  */
4204 class ParserOptions
4205 {
4206         # All variables are private
4207         private
4208                 $mAllowExternalImages,       # Allow external images inline
4209                 $mAllowExternalImagesFrom,   # If not, any exception?
4210                 $mAllowSpecialInclusion,     # Allow inclusion of special pages
4211                 $mDateFormat,                # Date format index
4212                 $mEditSection,               # Create "edit section" links
4213                 $mInterfaceMessage,          # Which lang to call for PLURAL and GRAMMAR
4214                 $mInterwikiMagic,            # Interlanguage links are removed and returned in an array
4215                 $mNumberHeadings,            # Automatically number headings
4216                 $mSkin,                      # Reference to the preferred skin
4217                 $mTidy,                      # Ask for tidy cleanup
4218                 $mUseDynamicDates,           # Use DateFormatter to format dates
4219                 $mUseTeX ;                   # Use texvc to expand <math> tags
4220
4221         function getUseTeX()                        { return $this->mUseTeX; }
4222         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4223         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4224         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4225         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4226         function &getSkin()                         { return $this->mSkin; }
4227         function getDateFormat()                    { return $this->mDateFormat; }
4228         function getEditSection()                   { return $this->mEditSection; }
4229         function getNumberHeadings()                { return $this->mNumberHeadings; }
4230         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4231         function getTidy()                          { return $this->mTidy; }
4232         function getInterfaceMessage()              { return $this->mInterfaceMessage; }
4233
4234         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4235         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4236         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4237         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4238         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4239         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4240         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4241         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4242         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4243         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4244         function setSkin( &$x ) { $this->mSkin =& $x; }
4245         function setInterfaceMessage( $x )          { return wfSetVar( $this->mInterfaceMessage, $x); }
4246
4247         function ParserOptions() {
4248                 global $wgUser;
4249                 $this->initialiseFromUser( $wgUser );
4250         }
4251
4252         /**
4253          * Get parser options
4254          * @static
4255          */
4256         static function newFromUser( &$user ) {
4257                 $popts = new ParserOptions;
4258                 $popts->initialiseFromUser( $user );
4259                 return $popts;
4260         }
4261
4262         /** Get user options */
4263         function initialiseFromUser( &$userInput ) {
4264                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4265                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4266                 $fname = 'ParserOptions::initialiseFromUser';
4267                 wfProfileIn( $fname );
4268                 if ( !$userInput ) {
4269                         $user = new User;
4270                         $user->setLoaded( true );
4271                 } else {
4272                         $user =& $userInput;
4273                 }
4274
4275                 $this->mUseTeX = $wgUseTeX;
4276                 $this->mUseDynamicDates = $wgUseDynamicDates;
4277                 $this->mInterwikiMagic = $wgInterwikiMagic;
4278                 $this->mAllowExternalImages = $wgAllowExternalImages;
4279                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4280                 wfProfileIn( $fname.'-skin' );
4281                 $this->mSkin =& $user->getSkin();
4282                 wfProfileOut( $fname.'-skin' );
4283                 $this->mDateFormat = $user->getOption( 'date' );
4284                 $this->mEditSection = true;
4285                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4286                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4287                 $this->mTidy = false;
4288                 $this->mInterfaceMessage = false;
4289                 wfProfileOut( $fname );
4290         }
4291 }
4292
4293 /**
4294  * Callback function used by Parser::replaceLinkHolders()
4295  * to substitute link placeholders.
4296  */
4297 function &wfOutputReplaceMatches( $matches ) {
4298         global $wgOutputReplace;
4299         return $wgOutputReplace[$matches[1]];
4300 }
4301
4302 /**
4303  * Return the total number of articles
4304  */
4305 function wfNumberOfArticles() {
4306         global $wgNumberOfArticles;
4307
4308         wfLoadSiteStats();
4309         return $wgNumberOfArticles;
4310 }
4311
4312 /**
4313  * Return the number of files
4314  */
4315 function wfNumberOfFiles() {
4316         $fname = 'wfNumberOfFiles';
4317
4318         wfProfileIn( $fname );
4319         $dbr =& wfGetDB( DB_SLAVE );
4320         $numImages = $dbr->selectField('site_stats', 'ss_images', array(), $fname );
4321         wfProfileOut( $fname );
4322
4323         return $numImages;
4324 }
4325
4326 /**
4327  * Return the number of user accounts
4328  * @return integer
4329  */
4330 function wfNumberOfUsers() {
4331         wfProfileIn( 'wfNumberOfUsers' );
4332         $dbr =& wfGetDB( DB_SLAVE );
4333         $count = $dbr->selectField( 'site_stats', 'ss_users', array(), 'wfNumberOfUsers' );
4334         wfProfileOut( 'wfNumberOfUsers' );
4335         return (int)$count;
4336 }
4337
4338 /**
4339  * Get various statistics from the database
4340  * @private
4341  */
4342 function wfLoadSiteStats() {
4343         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4344         $fname = 'wfLoadSiteStats';
4345
4346         if ( -1 != $wgNumberOfArticles ) return;
4347         $dbr =& wfGetDB( DB_SLAVE );
4348         $s = $dbr->selectRow( 'site_stats',
4349                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4350                 array( 'ss_row_id' => 1 ), $fname
4351         );
4352
4353         if ( $s === false ) {
4354                 return;
4355         } else {
4356                 $wgTotalViews = $s->ss_total_views;
4357                 $wgTotalEdits = $s->ss_total_edits;
4358                 $wgNumberOfArticles = $s->ss_good_articles;
4359         }
4360 }
4361
4362 /**
4363  * Escape html tags
4364  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4365  *
4366  * @param $in String: text that might contain HTML tags.
4367  * @return string Escaped string
4368  */
4369 function wfEscapeHTMLTagsOnly( $in ) {
4370         return str_replace(
4371                 array( '"', '>', '<' ),
4372                 array( '&quot;', '&gt;', '&lt;' ),
4373                 $in );
4374 }
4375
4376 ?>