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 // State constants for the definition list colon extraction
  62 define( 'MW_COLON_STATE_TEXT', 0 );
  63 define( 'MW_COLON_STATE_TAG', 1 );
  64 define( 'MW_COLON_STATE_TAGSTART', 2 );
  65 define( 'MW_COLON_STATE_CLOSETAG', 3 );
  66 define( 'MW_COLON_STATE_TAGSLASH', 4 );
  67 define( 'MW_COLON_STATE_COMMENT', 5 );
  68 define( 'MW_COLON_STATE_COMMENTDASH', 6 );
  69 define( 'MW_COLON_STATE_COMMENTDASHDASH', 7 );
  70
  71 /**
  72  * PHP Parser
  73  *
  74  * Processes wiki markup
  75  *
  76  * <pre>
  77  * There are three main entry points into the Parser class:
  78  * parse()
  79  *   produces HTML output
  80  * preSaveTransform().
  81  *   produces altered wiki markup.
  82  * transformMsg()
  83  *   performs brace substitution on MediaWiki messages
  84  *
  85  * Globals used:
  86  *    objects:   $wgLang, $wgContLang
  87  *
  88  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  89  *
  90  * settings:
  91  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  92  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  93  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  94  *
  95  *  * only within ParserOptions
  96  * </pre>
  97  *
  98  * @package MediaWiki
  99  */
 100 class Parser
 101 {
 102         /**#@+
 103          * @private
 104          */
 105         # Persistent:
 106         var $mTagHooks, $mFunctionHooks;
 107
 108         # Cleared with clearState():
 109         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 110         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 111         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 112         var $mTemplates,        // cache of already loaded templates, avoids
 113                                 // multiple SQL queries for the same string
 114             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 115                                 // in this path. Used for loop detection.
 116
 117         # Temporary
 118         # These are variables reset at least once per parse regardless of $clearState
 119         var $mOptions,      // ParserOptions object
 120                 $mTitle,        // Title context, used for self-link rendering and similar things
 121                 $mOutputType,   // Output type, one of the OT_xxx constants
 122                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 123
 124         /**#@-*/
 125
 126         /**
 127          * Constructor
 128          *
 129          * @public
 130          */
 131         function Parser() {
 132                 $this->mTagHooks = array();
 133                 $this->mFunctionHooks = array();
 134                 $this->clearState();
 135                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 136         }
 137
 138         /**
 139          * Clear Parser state
 140          *
 141          * @private
 142          */
 143         function clearState() {
 144                 $this->mOutput = new ParserOutput;
 145                 $this->mAutonumber = 0;
 146                 $this->mLastSection = '';
 147                 $this->mDTopen = false;
 148                 $this->mVariables = false;
 149                 $this->mIncludeCount = array();
 150                 $this->mStripState = array();
 151                 $this->mArgStack = array();
 152                 $this->mInPre = false;
 153                 $this->mInterwikiLinkHolders = array(
 154                         'texts' => array(),
 155                         'titles' => array()
 156                 );
 157                 $this->mLinkHolders = array(
 158                         'namespaces' => array(),
 159                         'dbkeys' => array(),
 160                         'queries' => array(),
 161                         'texts' => array(),
 162                         'titles' => array()
 163                 );
 164                 $this->mRevisionId = null;
 165
 166                 /**
 167                  * Prefix for temporary replacement strings for the multipass parser.
 168                  * \x07 should never appear in input as it's disallowed in XML.
 169                  * Using it at the front also gives us a little extra robustness
 170                  * since it shouldn't match when butted up against identifier-like
 171                  * string constructs.
 172                  */
 173                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 174
 175                 # Clear these on every parse, bug 4549
 176                 $this->mTemplates = array();
 177                 $this->mTemplatePath = array();
 178
 179                 $this->mShowToc = true;
 180                 $this->mForceTocPosition = false;
 181
 182                 wfRunHooks( 'ParserClearState', array( &$this ) );
 183         }
 184
 185         /**
 186          * Accessor for mUniqPrefix.
 187          *
 188          * @public
 189          */
 190         function UniqPrefix() {
 191                 return $this->mUniqPrefix;
 192         }
 193
 194         /**
 195          * Convert wikitext to HTML
 196          * Do not call this function recursively.
 197          *
 198          * @private
 199          * @param string $text Text we want to parse
 200          * @param Title &$title A title object
 201          * @param array $options
 202          * @param boolean $linestart
 203          * @param boolean $clearState
 204          * @param int $revid number to pass in {{REVISIONID}}
 205          * @return ParserOutput a ParserOutput
 206          */
 207         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 208                 /**
 209                  * First pass--just handle <nowiki> sections, pass the rest off
 210                  * to internalParse() which does all the real work.
 211                  */
 212
 213                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 214                 $fname = 'Parser::parse';
 215                 wfProfileIn( $fname );
 216
 217                 if ( $clearState ) {
 218                         $this->clearState();
 219                 }
 220
 221                 $this->mOptions = $options;
 222                 $this->mTitle =& $title;
 223                 $this->mRevisionId = $revid;
 224                 $this->mOutputType = OT_HTML;
 225
 226                 //$text = $this->strip( $text, $this->mStripState );
 227                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 228                 $x =& $this->mStripState;
 229
 230                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 231                 $text = $this->strip( $text, $x );
 232                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 233
 234                 # Hook to suspend the parser in this state
 235                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 236                         wfProfileOut( $fname );
 237                         return $text ;
 238                 }
 239
 240                 $text = $this->internalParse( $text );
 241
 242                 $text = $this->unstrip( $text, $this->mStripState );
 243
 244                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 245                 $fixtags = array(
 246                         # french spaces, last one Guillemet-left
 247                         # only if there is something before the space
 248                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 249                         # french spaces, Guillemet-right
 250                         '/(\\302\\253) /' => '\\1&nbsp;',
 251                 );
 252                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 253
 254                 # only once and last
 255                 $text = $this->doBlockLevels( $text, $linestart );
 256
 257                 $this->replaceLinkHolders( $text );
 258
 259                 # the position of the parserConvert() call should not be changed. it
 260                 # assumes that the links are all replaced and the only thing left
 261                 # is the <nowiki> mark.
 262                 # Side-effects: this calls $this->mOutput->setTitleText()
 263                 $text = $wgContLang->parserConvert( $text, $this );
 264
 265                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 266
 267                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 268
 269                 $text = Sanitizer::normalizeCharReferences( $text );
 270
 271                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 272                         $text = Parser::tidy($text);
 273                 } else {
 274                         # attempt to sanitize at least some nesting problems
 275                         # (bug #2702 and quite a few others)
 276                         $tidyregs = array(
 277                                 # ''Something [http://www.cool.com cool''] -->
 278                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 279                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 280                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 281                                 # fix up an anchor inside another anchor, only
 282                                 # at least for a single single nested link (bug 3695)
 283                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 284                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 285                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 286                                 # contains a div, so fix it up here; replace
 287                                 # div with escaped text
 288                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 289                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 290                                 # remove empty italic or bold tag pairs, some
 291                                 # introduced by rules above
 292                                 '/<([bi])><\/\\1>/' => ''
 293                         );
 294
 295                         $text = preg_replace(
 296                                 array_keys( $tidyregs ),
 297                                 array_values( $tidyregs ),
 298                                 $text );
 299                 }
 300
 301                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 302
 303                 $this->mOutput->setText( $text );
 304                 wfProfileOut( $fname );
 305
 306                 return $this->mOutput;
 307         }
 308
 309         /**
 310          * Get a random string
 311          *
 312          * @private
 313          * @static
 314          */
 315         function getRandomString() {
 316                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 317         }
 318
 319         function &getTitle() { return $this->mTitle; }
 320         function getOptions() { return $this->mOptions; }
 321
 322         /**
 323          * Replaces all occurrences of HTML-style comments and the given tags
 324          * in the text with a random marker and returns teh next text. The output
 325          * parameter $matches will be an associative array filled with data in
 326          * the form:
 327          *   'UNIQ-xxxxx' => array(
 328          *     'element',
 329          *     'tag content',
 330          *     array( 'param' => 'x' ),
 331          *     '<element param="x">tag content</element>' ) )
 332          *
 333          * @param $elements list of element names. Comments are always extracted.
 334          * @param $text Source text string.
 335          * @param $uniq_prefix
 336          *
 337          * @private
 338          * @static
 339          */
 340         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 341                 $rand = Parser::getRandomString();
 342                 $n = 1;
 343                 $stripped = '';
 344                 $matches = array();
 345
 346                 $taglist = implode( '|', $elements );
 347                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 348
 349                 while ( '' != $text ) {
 350                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 351                         $stripped .= $p[0];
 352                         if( count( $p ) < 5 ) {
 353                                 break;
 354                         }
 355                         if( count( $p ) > 5 ) {
 356                                 // comment
 357                                 $element    = $p[4];
 358                                 $attributes = '';
 359                                 $close      = '';
 360                                 $inside     = $p[5];
 361                         } else {
 362                                 // tag
 363                                 $element    = $p[1];
 364                                 $attributes = $p[2];
 365                                 $close      = $p[3];
 366                                 $inside     = $p[4];
 367                         }
 368
 369                         $marker = "$uniq_prefix-$element-$rand" . sprintf('%08X', $n++) . '-QINU';
 370                         $stripped .= $marker;
 371
 372                         if ( $close === '/>' ) {
 373                                 // Empty element tag, <tag />
 374                                 $content = null;
 375                                 $text = $inside;
 376                                 $tail = null;
 377                         } else {
 378                                 if( $element == '!--' ) {
 379                                         $end = '/(-->)/';
 380                                 } else {
 381                                         $end = "/(<\\/$element\\s*>)/i";
 382                                 }
 383                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 384                                 $content = $q[0];
 385                                 if( count( $q ) < 3 ) {
 386                                         # No end tag -- let it run out to the end of the text.
 387                                         $tail = '';
 388                                         $text = '';
 389                                 } else {
 390                                         $tail = $q[1];
 391                                         $text = $q[2];
 392                                 }
 393                         }
 394
 395                         $matches[$marker] = array( $element,
 396                                 $content,
 397                                 Sanitizer::decodeTagAttributes( $attributes ),
 398                                 "<$element$attributes$close$content$tail" );
 399                 }
 400                 return $stripped;
 401         }
 402
 403         /**
 404          * Strips and renders nowiki, pre, math, hiero
 405          * If $render is set, performs necessary rendering operations on plugins
 406          * Returns the text, and fills an array with data needed in unstrip()
 407          * If the $state is already a valid strip state, it adds to the state
 408          *
 409          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 410          *  will be stripped in addition to other tags. This is important
 411          *  for section editing, where these comments cause confusion when
 412          *  counting the sections in the wikisource
 413          *
 414          * @private
 415          */
 416         function strip( $text, &$state, $stripcomments = false ) {
 417                 $render = ($this->mOutputType == OT_HTML);
 418
 419                 # Replace any instances of the placeholders
 420                 $uniq_prefix = $this->mUniqPrefix;
 421                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 422                 $commentState = array();
 423
 424                 $elements = array_merge(
 425                         array( 'nowiki', 'gallery' ),
 426                         array_keys( $this->mTagHooks ) );
 427                 global $wgRawHtml;
 428                 if( $wgRawHtml ) {
 429                         $elements[] = 'html';
 430                 }
 431                 if( $this->mOptions->getUseTeX() ) {
 432                         $elements[] = 'math';
 433                 }
 434
 435
 436                 $matches = array();
 437                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 438
 439                 foreach( $matches as $marker => $data ) {
 440                         list( $element, $content, $params, $tag ) = $data;
 441                         if( $render ) {
 442                                 $tagName = strtolower( $element );
 443                                 switch( $tagName ) {
 444                                 case '!--':
 445                                         // Comment
 446                                         if( substr( $tag, -3 ) == '-->' ) {
 447                                                 $output = $tag;
 448                                         } else {
 449                                                 // Unclosed comment in input.
 450                                                 // Close it so later stripping can remove it
 451                                                 $output = "$tag-->";
 452                                         }
 453                                         break;
 454                                 case 'html':
 455                                         if( $wgRawHtml ) {
 456                                                 $output = $content;
 457                                                 break;
 458                                         }
 459                                         // Shouldn't happen otherwise. :)
 460                                 case 'nowiki':
 461                                         $output = wfEscapeHTMLTagsOnly( $content );
 462                                         break;
 463                                 case 'math':
 464                                         $output = MathRenderer::renderMath( $content );
 465                                         break;
 466                                 case 'gallery':
 467                                         $output = $this->renderImageGallery( $content );
 468                                         break;
 469                                 default:
 470                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 471                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 472                                                         array( $content, $params, $this ) );
 473                                         } else {
 474                                                 wfDebugDieBacktrace( "Invalid call hook $element" );
 475                                         }
 476                                 }
 477                         } else {
 478                                 // Just stripping tags; keep the source
 479                                 $output = $tag;
 480                         }
 481                         if( !$stripcomments && $element == '!--' ) {
 482                                 $commentState[$marker] = $output;
 483                         } else {
 484                                 $state[$element][$marker] = $output;
 485                         }
 486                 }
 487
 488                 # Unstrip comments unless explicitly told otherwise.
 489                 # (The comments are always stripped prior to this point, so as to
 490                 # not invoke any extension tags / parser hooks contained within
 491                 # a comment.)
 492                 if ( !$stripcomments ) {
 493                         // Put them all back and forget them
 494                         $text = strtr( $text, $commentState );
 495                 }
 496
 497                 return $text;
 498         }
 499
 500         /**
 501          * Restores pre, math, and other extensions removed by strip()
 502          *
 503          * always call unstripNoWiki() after this one
 504          * @private
 505          */
 506         function unstrip( $text, &$state ) {
 507                 if ( !is_array( $state ) ) {
 508                         return $text;
 509                 }
 510
 511                 $replacements = array();
 512                 foreach( $state as $tag => $contentDict ) {
 513                         if( $tag != 'nowiki' && $tag != 'html' ) {
 514                                 foreach( $contentDict as $uniq => $content ) {
 515                                         $replacements[$uniq] = $content;
 516                                 }
 517                         }
 518                 }
 519                 $text = strtr( $text, $replacements );
 520
 521                 return $text;
 522         }
 523
 524         /**
 525          * Always call this after unstrip() to preserve the order
 526          *
 527          * @private
 528          */
 529         function unstripNoWiki( $text, &$state ) {
 530                 if ( !is_array( $state ) ) {
 531                         return $text;
 532                 }
 533
 534                 $replacements = array();
 535                 foreach( $state as $tag => $contentDict ) {
 536                         if( $tag == 'nowiki' || $tag == 'html' ) {
 537                                 foreach( $contentDict as $uniq => $content ) {
 538                                         $replacements[$uniq] = $content;
 539                                 }
 540                         }
 541                 }
 542                 $text = strtr( $text, $replacements );
 543
 544                 return $text;
 545         }
 546
 547         /**
 548          * Add an item to the strip state
 549          * Returns the unique tag which must be inserted into the stripped text
 550          * The tag will be replaced with the original text in unstrip()
 551          *
 552          * @private
 553          */
 554         function insertStripItem( $text, &$state ) {
 555                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 556                 if ( !$state ) {
 557                         $state = array();
 558                 }
 559                 $state['item'][$rnd] = $text;
 560                 return $rnd;
 561         }
 562
 563         /**
 564          * Interface with html tidy, used if $wgUseTidy = true.
 565          * If tidy isn't able to correct the markup, the original will be
 566          * returned in all its glory with a warning comment appended.
 567          *
 568          * Either the external tidy program or the in-process tidy extension
 569          * will be used depending on availability. Override the default
 570          * $wgTidyInternal setting to disable the internal if it's not working.
 571          *
 572          * @param string $text Hideous HTML input
 573          * @return string Corrected HTML output
 574          * @public
 575          * @static
 576          */
 577         function tidy( $text ) {
 578                 global $wgTidyInternal;
 579                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 580 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 581 '<head><title>test</title></head><body>'.$text.'</body></html>';
 582                 if( $wgTidyInternal ) {
 583                         $correctedtext = Parser::internalTidy( $wrappedtext );
 584                 } else {
 585                         $correctedtext = Parser::externalTidy( $wrappedtext );
 586                 }
 587                 if( is_null( $correctedtext ) ) {
 588                         wfDebug( "Tidy error detected!\n" );
 589                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 590                 }
 591                 return $correctedtext;
 592         }
 593
 594         /**
 595          * Spawn an external HTML tidy process and get corrected markup back from it.
 596          *
 597          * @private
 598          * @static
 599          */
 600         function externalTidy( $text ) {
 601                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 602                 $fname = 'Parser::externalTidy';
 603                 wfProfileIn( $fname );
 604
 605                 $cleansource = '';
 606                 $opts = ' -utf8';
 607
 608                 $descriptorspec = array(
 609                         0 => array('pipe', 'r'),
 610                         1 => array('pipe', 'w'),
 611                         2 => array('file', '/dev/null', 'a')
 612                 );
 613                 $pipes = array();
 614                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 615                 if (is_resource($process)) {
 616                         // Theoretically, this style of communication could cause a deadlock
 617                         // here. If the stdout buffer fills up, then writes to stdin could
 618                         // block. This doesn't appear to happen with tidy, because tidy only
 619                         // writes to stdout after it's finished reading from stdin. Search
 620                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 621                         fwrite($pipes[0], $text);
 622                         fclose($pipes[0]);
 623                         while (!feof($pipes[1])) {
 624                                 $cleansource .= fgets($pipes[1], 1024);
 625                         }
 626                         fclose($pipes[1]);
 627                         proc_close($process);
 628                 }
 629
 630                 wfProfileOut( $fname );
 631
 632                 if( $cleansource == '' && $text != '') {
 633                         // Some kind of error happened, so we couldn't get the corrected text.
 634                         // Just give up; we'll use the source text and append a warning.
 635                         return null;
 636                 } else {
 637                         return $cleansource;
 638                 }
 639         }
 640
 641         /**
 642          * Use the HTML tidy PECL extension to use the tidy library in-process,
 643          * saving the overhead of spawning a new process. Currently written to
 644          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 645          *
 646          * 'pear install tidy' should be able to compile the extension module.
 647          *
 648          * @private
 649          * @static
 650          */
 651         function internalTidy( $text ) {
 652                 global $wgTidyConf;
 653                 $fname = 'Parser::internalTidy';
 654                 wfProfileIn( $fname );
 655
 656                 tidy_load_config( $wgTidyConf );
 657                 tidy_set_encoding( 'utf8' );
 658                 tidy_parse_string( $text );
 659                 tidy_clean_repair();
 660                 if( tidy_get_status() == 2 ) {
 661                         // 2 is magic number for fatal error
 662                         // http://www.php.net/manual/en/function.tidy-get-status.php
 663                         $cleansource = null;
 664                 } else {
 665                         $cleansource = tidy_get_output();
 666                 }
 667                 wfProfileOut( $fname );
 668                 return $cleansource;
 669         }
 670
 671         /**
 672          * parse the wiki syntax used to render tables
 673          *
 674          * @private
 675          */
 676         function doTableStuff ( $t ) {
 677                 $fname = 'Parser::doTableStuff';
 678                 wfProfileIn( $fname );
 679
 680                 $t = explode ( "\n" , $t ) ;
 681                 $td = array () ; # Is currently a td tag open?
 682                 $ltd = array () ; # Was it TD or TH?
 683                 $tr = array () ; # Is currently a tr tag open?
 684                 $ltr = array () ; # tr attributes
 685                 $has_opened_tr = array(); # Did this table open a <tr> element?
 686                 $indent_level = 0; # indent level of the table
 687                 foreach ( $t AS $k => $x )
 688                 {
 689                         $x = trim ( $x ) ;
 690                         $fc = substr ( $x , 0 , 1 ) ;
 691                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 692                                 $indent_level = strlen( $matches[1] );
 693
 694                                 $attributes = $this->unstripForHTML( $matches[2] );
 695
 696                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 697                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 698                                 array_push ( $td , false ) ;
 699                                 array_push ( $ltd , '' ) ;
 700                                 array_push ( $tr , false ) ;
 701                                 array_push ( $ltr , '' ) ;
 702                                 array_push ( $has_opened_tr, false );
 703                         }
 704                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 705                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 706                                 $z = "</table>" . substr ( $x , 2);
 707                                 $l = array_pop ( $ltd ) ;
 708                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 709                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 710                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 711                                 array_pop ( $ltr ) ;
 712                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 713                         }
 714                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 715                                 $x = substr ( $x , 1 ) ;
 716                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 717                                 $z = '' ;
 718                                 $l = array_pop ( $ltd ) ;
 719                                 array_pop ( $has_opened_tr );
 720                                 array_push ( $has_opened_tr , true ) ;
 721                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 722                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 723                                 array_pop ( $ltr ) ;
 724                                 $t[$k] = $z ;
 725                                 array_push ( $tr , false ) ;
 726                                 array_push ( $td , false ) ;
 727                                 array_push ( $ltd , '' ) ;
 728                                 $attributes = $this->unstripForHTML( $x );
 729                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 730                         }
 731                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 732                                 # $x is a table row
 733                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 734                                         $fc = '+' ;
 735                                         $x = substr ( $x , 1 ) ;
 736                                 }
 737                                 $after = substr ( $x , 1 ) ;
 738                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 739
 740                                 // Split up multiple cells on the same line.
 741                                 // FIXME: This can result in improper nesting of tags processed
 742                                 // by earlier parser steps, but should avoid splitting up eg
 743                                 // attribute values containing literal "||".
 744                                 $after = wfExplodeMarkup( '||', $after );
 745
 746                                 $t[$k] = '' ;
 747
 748                                 # Loop through each table cell
 749                                 foreach ( $after AS $theline )
 750                                 {
 751                                         $z = '' ;
 752                                         if ( $fc != '+' )
 753                                         {
 754                                                 $tra = array_pop ( $ltr ) ;
 755                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 756                                                 array_push ( $tr , true ) ;
 757                                                 array_push ( $ltr , '' ) ;
 758                                                 array_pop ( $has_opened_tr );
 759                                                 array_push ( $has_opened_tr , true ) ;
 760                                         }
 761
 762                                         $l = array_pop ( $ltd ) ;
 763                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 764                                         if ( $fc == '|' ) $l = 'td' ;
 765                                         else if ( $fc == '!' ) $l = 'th' ;
 766                                         else if ( $fc == '+' ) $l = 'caption' ;
 767                                         else $l = '' ;
 768                                         array_push ( $ltd , $l ) ;
 769
 770                                         # Cell parameters
 771                                         $y = explode ( '|' , $theline , 2 ) ;
 772                                         # Note that a '|' inside an invalid link should not
 773                                         # be mistaken as delimiting cell parameters
 774                                         if ( strpos( $y[0], '[[' ) !== false ) {
 775                                                 $y = array ($theline);
 776                                         }
 777                                         if ( count ( $y ) == 1 )
 778                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 779                                         else {
 780                                                 $attributes = $this->unstripForHTML( $y[0] );
 781                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 782                                         }
 783                                         $t[$k] .= $y ;
 784                                         array_push ( $td , true ) ;
 785                                 }
 786                         }
 787                 }
 788
 789                 # Closing open td, tr && table
 790                 while ( count ( $td ) > 0 )
 791                 {
 792                         $l = array_pop ( $ltd ) ;
 793                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 794                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 795                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 796                         $t[] = '</table>' ;
 797                 }
 798
 799                 $t = implode ( "\n" , $t ) ;
 800                 # special case: don't return empty table
 801                 if($t == "<table>\n<tr><td></td></tr>\n</table>")
 802                         $t = '';
 803                 wfProfileOut( $fname );
 804                 return $t ;
 805         }
 806
 807         /**
 808          * Helper function for parse() that transforms wiki markup into
 809          * HTML. Only called for $mOutputType == OT_HTML.
 810          *
 811          * @private
 812          */
 813         function internalParse( $text ) {
 814                 $args = array();
 815                 $isMain = true;
 816                 $fname = 'Parser::internalParse';
 817                 wfProfileIn( $fname );
 818
 819                 # Remove <noinclude> tags and <includeonly> sections
 820                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 821                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 822                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 823
 824                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 825
 826                 $text = $this->replaceVariables( $text, $args );
 827
 828                 // Tables need to come after variable replacement for things to work
 829                 // properly; putting them before other transformations should keep
 830                 // exciting things like link expansions from showing up in surprising
 831                 // places.
 832                 $text = $this->doTableStuff( $text );
 833
 834                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 835
 836                 $text = $this->stripToc( $text );
 837                 $text = $this->doHeadings( $text );
 838                 if($this->mOptions->getUseDynamicDates()) {
 839                         $df =& DateFormatter::getInstance();
 840                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 841                 }
 842                 $text = $this->doAllQuotes( $text );
 843                 $text = $this->replaceInternalLinks( $text );
 844                 $text = $this->replaceExternalLinks( $text );
 845
 846                 # replaceInternalLinks may sometimes leave behind
 847                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 848                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 849
 850                 $text = $this->doMagicLinks( $text );
 851                 $text = $this->formatHeadings( $text, $isMain );
 852
 853                 wfProfileOut( $fname );
 854                 return $text;
 855         }
 856
 857         /**
 858          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 859          * magic external links.
 860          *
 861          * @private
 862          */
 863         function &doMagicLinks( &$text ) {
 864                 $text = $this->magicISBN( $text );
 865                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 866                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 867                 return $text;
 868         }
 869
 870         /**
 871          * Parse headers and return html
 872          *
 873          * @private
 874          */
 875         function doHeadings( $text ) {
 876                 $fname = 'Parser::doHeadings';
 877                 wfProfileIn( $fname );
 878                 for ( $i = 6; $i >= 1; --$i ) {
 879                         $h = str_repeat( '=', $i );
 880                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
 881                           "<h{$i}>\\1</h{$i}>\\2", $text );
 882                 }
 883                 wfProfileOut( $fname );
 884                 return $text;
 885         }
 886
 887         /**
 888          * Replace single quotes with HTML markup
 889          * @private
 890          * @return string the altered text
 891          */
 892         function doAllQuotes( $text ) {
 893                 $fname = 'Parser::doAllQuotes';
 894                 wfProfileIn( $fname );
 895                 $outtext = '';
 896                 $lines = explode( "\n", $text );
 897                 foreach ( $lines as $line ) {
 898                         $outtext .= $this->doQuotes ( $line ) . "\n";
 899                 }
 900                 $outtext = substr($outtext, 0,-1);
 901                 wfProfileOut( $fname );
 902                 return $outtext;
 903         }
 904
 905         /**
 906          * Helper function for doAllQuotes()
 907          * @private
 908          */
 909         function doQuotes( $text ) {
 910                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 911                 if ( count( $arr ) == 1 )
 912                         return $text;
 913                 else
 914                 {
 915                         # First, do some preliminary work. This may shift some apostrophes from
 916                         # being mark-up to being text. It also counts the number of occurrences
 917                         # of bold and italics mark-ups.
 918                         $i = 0;
 919                         $numbold = 0;
 920                         $numitalics = 0;
 921                         foreach ( $arr as $r )
 922                         {
 923                                 if ( ( $i % 2 ) == 1 )
 924                                 {
 925                                         # If there are ever four apostrophes, assume the first is supposed to
 926                                         # be text, and the remaining three constitute mark-up for bold text.
 927                                         if ( strlen( $arr[$i] ) == 4 )
 928                                         {
 929                                                 $arr[$i-1] .= "'";
 930                                                 $arr[$i] = "'''";
 931                                         }
 932                                         # If there are more than 5 apostrophes in a row, assume they're all
 933                                         # text except for the last 5.
 934                                         else if ( strlen( $arr[$i] ) > 5 )
 935                                         {
 936                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 937                                                 $arr[$i] = "'''''";
 938                                         }
 939                                         # Count the number of occurrences of bold and italics mark-ups.
 940                                         # We are not counting sequences of five apostrophes.
 941                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 942                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 943                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 944                                 }
 945                                 $i++;
 946                         }
 947
 948                         # If there is an odd number of both bold and italics, it is likely
 949                         # that one of the bold ones was meant to be an apostrophe followed
 950                         # by italics. Which one we cannot know for certain, but it is more
 951                         # likely to be one that has a single-letter word before it.
 952                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 953                         {
 954                                 $i = 0;
 955                                 $firstsingleletterword = -1;
 956                                 $firstmultiletterword = -1;
 957                                 $firstspace = -1;
 958                                 foreach ( $arr as $r )
 959                                 {
 960                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 961                                         {
 962                                                 $x1 = substr ($arr[$i-1], -1);
 963                                                 $x2 = substr ($arr[$i-1], -2, 1);
 964                                                 if ($x1 == ' ') {
 965                                                         if ($firstspace == -1) $firstspace = $i;
 966                                                 } else if ($x2 == ' ') {
 967                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 968                                                 } else {
 969                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 970                                                 }
 971                                         }
 972                                         $i++;
 973                                 }
 974
 975                                 # If there is a single-letter word, use it!
 976                                 if ($firstsingleletterword > -1)
 977                                 {
 978                                         $arr [ $firstsingleletterword ] = "''";
 979                                         $arr [ $firstsingleletterword-1 ] .= "'";
 980                                 }
 981                                 # If not, but there's a multi-letter word, use that one.
 982                                 else if ($firstmultiletterword > -1)
 983                                 {
 984                                         $arr [ $firstmultiletterword ] = "''";
 985                                         $arr [ $firstmultiletterword-1 ] .= "'";
 986                                 }
 987                                 # ... otherwise use the first one that has neither.
 988                                 # (notice that it is possible for all three to be -1 if, for example,
 989                                 # there is only one pentuple-apostrophe in the line)
 990                                 else if ($firstspace > -1)
 991                                 {
 992                                         $arr [ $firstspace ] = "''";
 993                                         $arr [ $firstspace-1 ] .= "'";
 994                                 }
 995                         }
 996
 997                         # Now let's actually convert our apostrophic mush to HTML!
 998                         $output = '';
 999                         $buffer = '';
1000                         $state = '';
1001                         $i = 0;
1002                         foreach ($arr as $r)
1003                         {
1004                                 if (($i % 2) == 0)
1005                                 {
1006                                         if ($state == 'both')
1007                                                 $buffer .= $r;
1008                                         else
1009                                                 $output .= $r;
1010                                 }
1011                                 else
1012                                 {
1013                                         if (strlen ($r) == 2)
1014                                         {
1015                                                 if ($state == 'i')
1016                                                 { $output .= '</i>'; $state = ''; }
1017                                                 else if ($state == 'bi')
1018                                                 { $output .= '</i>'; $state = 'b'; }
1019                                                 else if ($state == 'ib')
1020                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1021                                                 else if ($state == 'both')
1022                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1023                                                 else # $state can be 'b' or ''
1024                                                 { $output .= '<i>'; $state .= 'i'; }
1025                                         }
1026                                         else if (strlen ($r) == 3)
1027                                         {
1028                                                 if ($state == 'b')
1029                                                 { $output .= '</b>'; $state = ''; }
1030                                                 else if ($state == 'bi')
1031                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1032                                                 else if ($state == 'ib')
1033                                                 { $output .= '</b>'; $state = 'i'; }
1034                                                 else if ($state == 'both')
1035                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1036                                                 else # $state can be 'i' or ''
1037                                                 { $output .= '<b>'; $state .= 'b'; }
1038                                         }
1039                                         else if (strlen ($r) == 5)
1040                                         {
1041                                                 if ($state == 'b')
1042                                                 { $output .= '</b><i>'; $state = 'i'; }
1043                                                 else if ($state == 'i')
1044                                                 { $output .= '</i><b>'; $state = 'b'; }
1045                                                 else if ($state == 'bi')
1046                                                 { $output .= '</i></b>'; $state = ''; }
1047                                                 else if ($state == 'ib')
1048                                                 { $output .= '</b></i>'; $state = ''; }
1049                                                 else if ($state == 'both')
1050                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1051                                                 else # ($state == '')
1052                                                 { $buffer = ''; $state = 'both'; }
1053                                         }
1054                                 }
1055                                 $i++;
1056                         }
1057                         # Now close all remaining tags.  Notice that the order is important.
1058                         if ($state == 'b' || $state == 'ib')
1059                                 $output .= '</b>';
1060                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1061                                 $output .= '</i>';
1062                         if ($state == 'bi')
1063                                 $output .= '</b>';
1064                         if ($state == 'both')
1065                                 $output .= '<b><i>'.$buffer.'</i></b>';
1066                         return $output;
1067                 }
1068         }
1069
1070         /**
1071          * Replace external links
1072          *
1073          * Note: this is all very hackish and the order of execution matters a lot.
1074          * Make sure to run maintenance/parserTests.php if you change this code.
1075          *
1076          * @private
1077          */
1078         function replaceExternalLinks( $text ) {
1079                 global $wgContLang;
1080                 $fname = 'Parser::replaceExternalLinks';
1081                 wfProfileIn( $fname );
1082
1083                 $sk =& $this->mOptions->getSkin();
1084
1085                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1086
1087                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1088
1089                 $i = 0;
1090                 while ( $i<count( $bits ) ) {
1091                         $url = $bits[$i++];
1092                         $protocol = $bits[$i++];
1093                         $text = $bits[$i++];
1094                         $trail = $bits[$i++];
1095
1096                         # The characters '<' and '>' (which were escaped by
1097                         # removeHTMLtags()) should not be included in
1098                         # URLs, per RFC 2396.
1099                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1100                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1101                                 $url = substr($url, 0, $m2[0][1]);
1102                         }
1103
1104                         # If the link text is an image URL, replace it with an <img> tag
1105                         # This happened by accident in the original parser, but some people used it extensively
1106                         $img = $this->maybeMakeExternalImage( $text );
1107                         if ( $img !== false ) {
1108                                 $text = $img;
1109                         }
1110
1111                         $dtrail = '';
1112
1113                         # Set linktype for CSS - if URL==text, link is essentially free
1114                         $linktype = ($text == $url) ? 'free' : 'text';
1115
1116                         # No link text, e.g. [http://domain.tld/some.link]
1117                         if ( $text == '' ) {
1118                                 # Autonumber if allowed. See bug #5918
1119                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1120                                         $text = '[' . ++$this->mAutonumber . ']';
1121                                         $linktype = 'autonumber';
1122                                 } else {
1123                                         # Otherwise just use the URL
1124                                         $text = htmlspecialchars( $url );
1125                                         $linktype = 'free';
1126                                 }
1127                         } else {
1128                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1129                                 # Check for trail
1130                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1131                         }
1132
1133                         $text = $wgContLang->markNoConversion($text);
1134
1135                         # Normalize any HTML entities in input. They will be
1136                         # re-escaped by makeExternalLink().
1137                         $url = Sanitizer::decodeCharReferences( $url );
1138
1139                         # Process the trail (i.e. everything after this link up until start of the next link),
1140                         # replacing any non-bracketed links
1141                         $trail = $this->replaceFreeExternalLinks( $trail );
1142
1143                         # Use the encoded URL
1144                         # This means that users can paste URLs directly into the text
1145                         # Funny characters like &ouml; aren't valid in URLs anyway
1146                         # This was changed in August 2004
1147                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1148
1149                         # Register link in the output object.
1150                         # Replace unnecessary URL escape codes with the referenced character
1151                         # This prevents spammers from hiding links from the filters
1152                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1153                         $this->mOutput->addExternalLink( $pasteurized );
1154                 }
1155
1156                 wfProfileOut( $fname );
1157                 return $s;
1158         }
1159
1160         /**
1161          * Replace anything that looks like a URL with a link
1162          * @private
1163          */
1164         function replaceFreeExternalLinks( $text ) {
1165                 global $wgContLang;
1166                 $fname = 'Parser::replaceFreeExternalLinks';
1167                 wfProfileIn( $fname );
1168
1169                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1170                 $s = array_shift( $bits );
1171                 $i = 0;
1172
1173                 $sk =& $this->mOptions->getSkin();
1174
1175                 while ( $i < count( $bits ) ){
1176                         $protocol = $bits[$i++];
1177                         $remainder = $bits[$i++];
1178
1179                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1180                                 # Found some characters after the protocol that look promising
1181                                 $url = $protocol . $m[1];
1182                                 $trail = $m[2];
1183
1184                                 # special case: handle urls as url args:
1185                                 # http://www.example.com/foo?=http://www.example.com/bar
1186                                 if(strlen($trail) == 0 &&
1187                                         isset($bits[$i]) &&
1188                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1189                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1190                                 {
1191                                         # add protocol, arg
1192                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1193                                         $i += 2;
1194                                         $trail = $m[2];
1195                                 }
1196
1197                                 # The characters '<' and '>' (which were escaped by
1198                                 # removeHTMLtags()) should not be included in
1199                                 # URLs, per RFC 2396.
1200                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1201                                         $trail = substr($url, $m2[0][1]) . $trail;
1202                                         $url = substr($url, 0, $m2[0][1]);
1203                                 }
1204
1205                                 # Move trailing punctuation to $trail
1206                                 $sep = ',;\.:!?';
1207                                 # If there is no left bracket, then consider right brackets fair game too
1208                                 if ( strpos( $url, '(' ) === false ) {
1209                                         $sep .= ')';
1210                                 }
1211
1212                                 $numSepChars = strspn( strrev( $url ), $sep );
1213                                 if ( $numSepChars ) {
1214                                         $trail = substr( $url, -$numSepChars ) . $trail;
1215                                         $url = substr( $url, 0, -$numSepChars );
1216                                 }
1217
1218                                 # Normalize any HTML entities in input. They will be
1219                                 # re-escaped by makeExternalLink() or maybeMakeExternalImage()
1220                                 $url = Sanitizer::decodeCharReferences( $url );
1221
1222                                 # Is this an external image?
1223                                 $text = $this->maybeMakeExternalImage( $url );
1224                                 if ( $text === false ) {
1225                                         # Not an image, make a link
1226                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1227                                         # Register it in the output object...
1228                                         # Replace unnecessary URL escape codes with their equivalent characters
1229                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1230                                         $this->mOutput->addExternalLink( $pasteurized );
1231                                 }
1232                                 $s .= $text . $trail;
1233                         } else {
1234                                 $s .= $protocol . $remainder;
1235                         }
1236                 }
1237                 wfProfileOut( $fname );
1238                 return $s;
1239         }
1240
1241         /**
1242          * Replace unusual URL escape codes with their equivalent characters
1243          * @param string
1244          * @return string
1245          * @static
1246          * @fixme This can merge genuinely required bits in the path or query string,
1247          *        breaking legit URLs. A proper fix would treat the various parts of
1248          *        the URL differently; as a workaround, just use the output for
1249          *        statistical records, not for actual linking/output.
1250          */
1251         function replaceUnusualEscapes( $url ) {
1252                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1253                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1254         }
1255
1256         /**
1257          * Callback function used in replaceUnusualEscapes().
1258          * Replaces unusual URL escape codes with their equivalent character
1259          * @static
1260          * @private
1261          */
1262         function replaceUnusualEscapesCallback( $matches ) {
1263                 $char = urldecode( $matches[0] );
1264                 $ord = ord( $char );
1265                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1266                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1267                         // No, shouldn't be escaped
1268                         return $char;
1269                 } else {
1270                         // Yes, leave it escaped
1271                         return $matches[0];
1272                 }
1273         }
1274
1275         /**
1276          * make an image if it's allowed, either through the global
1277          * option or through the exception
1278          * @private
1279          */
1280         function maybeMakeExternalImage( $url ) {
1281                 $sk =& $this->mOptions->getSkin();
1282                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1283                 $imagesexception = !empty($imagesfrom);
1284                 $text = false;
1285                 if ( $this->mOptions->getAllowExternalImages()
1286                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1287                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1288                                 # Image found
1289                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1290                         }
1291                 }
1292                 return $text;
1293         }
1294
1295         /**
1296          * Process [[ ]] wikilinks
1297          *
1298          * @private
1299          */
1300         function replaceInternalLinks( $s ) {
1301                 global $wgContLang;
1302                 static $fname = 'Parser::replaceInternalLinks' ;
1303
1304                 wfProfileIn( $fname );
1305
1306                 wfProfileIn( $fname.'-setup' );
1307                 static $tc = FALSE;
1308                 # the % is needed to support urlencoded titles as well
1309                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1310
1311                 $sk =& $this->mOptions->getSkin();
1312
1313                 #split the entire text string on occurences of [[
1314                 $a = explode( '[[', ' ' . $s );
1315                 #get the first element (all text up to first [[), and remove the space we added
1316                 $s = array_shift( $a );
1317                 $s = substr( $s, 1 );
1318
1319                 # Match a link having the form [[namespace:link|alternate]]trail
1320                 static $e1 = FALSE;
1321                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1322                 # Match cases where there is no "]]", which might still be images
1323                 static $e1_img = FALSE;
1324                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1325                 # Match the end of a line for a word that's not followed by whitespace,
1326                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1327                 $e2 = wfMsgForContent( 'linkprefix' );
1328
1329                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1330
1331                 if( is_null( $this->mTitle ) ) {
1332                         wfDebugDieBacktrace( 'nooo' );
1333                 }
1334                 $nottalk = !$this->mTitle->isTalkPage();
1335
1336                 if ( $useLinkPrefixExtension ) {
1337                         if ( preg_match( $e2, $s, $m ) ) {
1338                                 $first_prefix = $m[2];
1339                         } else {
1340                                 $first_prefix = false;
1341                         }
1342                 } else {
1343                         $prefix = '';
1344                 }
1345
1346                 $selflink = $this->mTitle->getPrefixedText();
1347                 wfProfileOut( $fname.'-setup' );
1348
1349                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1350                 $useSubpages = $this->areSubpagesAllowed();
1351
1352                 # Loop for each link
1353                 for ($k = 0; isset( $a[$k] ); $k++) {
1354                         $line = $a[$k];
1355                         if ( $useLinkPrefixExtension ) {
1356                                 wfProfileIn( $fname.'-prefixhandling' );
1357                                 if ( preg_match( $e2, $s, $m ) ) {
1358                                         $prefix = $m[2];
1359                                         $s = $m[1];
1360                                 } else {
1361                                         $prefix='';
1362                                 }
1363                                 # first link
1364                                 if($first_prefix) {
1365                                         $prefix = $first_prefix;
1366                                         $first_prefix = false;
1367                                 }
1368                                 wfProfileOut( $fname.'-prefixhandling' );
1369                         }
1370
1371                         $might_be_img = false;
1372
1373                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1374                                 $text = $m[2];
1375                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1376                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1377                                 # the real problem is with the $e1 regex
1378                                 # See bug 1300.
1379                                 #
1380                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1381                                 # and no image is in sight. See bug 2095.
1382                                 #
1383                                 if( $text !== '' &&
1384                                         preg_match( "/^\](.*)/s", $m[3], $n ) &&
1385                                         strpos($text, '[') !== false
1386                                 )
1387                                 {
1388                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1389                                         $m[3] = $n[1];
1390                                 }
1391                                 # fix up urlencoded title texts
1392                                 if(preg_match('/%/', $m[1] ))
1393                                         # Should anchors '#' also be rejected?
1394                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1395                                 $trail = $m[3];
1396                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1397                                 $might_be_img = true;
1398                                 $text = $m[2];
1399                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1400                                 $trail = "";
1401                         } else { # Invalid form; output directly
1402                                 $s .= $prefix . '[[' . $line ;
1403                                 continue;
1404                         }
1405
1406                         # Don't allow internal links to pages containing
1407                         # PROTO: where PROTO is a valid URL protocol; these
1408                         # should be external links.
1409                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1410                                 $s .= $prefix . '[[' . $line ;
1411                                 continue;
1412                         }
1413
1414                         # Make subpage if necessary
1415                         if( $useSubpages ) {
1416                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1417                         } else {
1418                                 $link = $m[1];
1419                         }
1420
1421                         $noforce = (substr($m[1], 0, 1) != ':');
1422                         if (!$noforce) {
1423                                 # Strip off leading ':'
1424                                 $link = substr($link, 1);
1425                         }
1426
1427                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1428                         if( !$nt ) {
1429                                 $s .= $prefix . '[[' . $line;
1430                                 continue;
1431                         }
1432
1433                         #check other language variants of the link
1434                         #if the article does not exist
1435                         if( $checkVariantLink
1436                             && $nt->getArticleID() == 0 ) {
1437                                 $wgContLang->findVariantLink($link, $nt);
1438                         }
1439
1440                         $ns = $nt->getNamespace();
1441                         $iw = $nt->getInterWiki();
1442
1443                         if ($might_be_img) { # if this is actually an invalid link
1444                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1445                                         $found = false;
1446                                         while (isset ($a[$k+1]) ) {
1447                                                 #look at the next 'line' to see if we can close it there
1448                                                 $spliced = array_splice( $a, $k + 1, 1 );
1449                                                 $next_line = array_shift( $spliced );
1450                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1451                                                 # the first ]] closes the inner link, the second the image
1452                                                         $found = true;
1453                                                         $text .= '[[' . $m[1];
1454                                                         $trail = $m[2];
1455                                                         break;
1456                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1457                                                         #if there's exactly one ]] that's fine, we'll keep looking
1458                                                         $text .= '[[' . $m[0];
1459                                                 } else {
1460                                                         #if $next_line is invalid too, we need look no further
1461                                                         $text .= '[[' . $next_line;
1462                                                         break;
1463                                                 }
1464                                         }
1465                                         if ( !$found ) {
1466                                                 # we couldn't find the end of this imageLink, so output it raw
1467                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1468                                                 $text = $this->replaceInternalLinks($text);
1469                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1470                                                 # note: no $trail, because without an end, there *is* no trail
1471                                                 continue;
1472                                         }
1473                                 } else { #it's not an image, so output it raw
1474                                         $s .= $prefix . '[[' . $link . '|' . $text;
1475                                         # note: no $trail, because without an end, there *is* no trail
1476                                         continue;
1477                                 }
1478                         }
1479
1480                         $wasblank = ( '' == $text );
1481                         if( $wasblank ) $text = $link;
1482
1483
1484                         # Link not escaped by : , create the various objects
1485                         if( $noforce ) {
1486
1487                                 # Interwikis
1488                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1489                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1490                                         $s = rtrim($s . "\n");
1491                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1492                                         continue;
1493                                 }
1494
1495                                 if ( $ns == NS_IMAGE ) {
1496                                         wfProfileIn( "$fname-image" );
1497                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1498                                                 # recursively parse links inside the image caption
1499                                                 # actually, this will parse them in any other parameters, too,
1500                                                 # but it might be hard to fix that, and it doesn't matter ATM
1501                                                 $text = $this->replaceExternalLinks($text);
1502                                                 $text = $this->replaceInternalLinks($text);
1503
1504                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1505                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1506                                                 $this->mOutput->addImage( $nt->getDBkey() );
1507
1508                                                 wfProfileOut( "$fname-image" );
1509                                                 continue;
1510                                         }
1511                                         wfProfileOut( "$fname-image" );
1512
1513                                 }
1514
1515                                 if ( $ns == NS_CATEGORY ) {
1516                                         wfProfileIn( "$fname-category" );
1517                                         $s = rtrim($s . "\n"); # bug 87
1518
1519                                         if ( $wasblank ) {
1520                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1521                                                         $sortkey = $this->mTitle->getText();
1522                                                 } else {
1523                                                         $sortkey = $this->mTitle->getPrefixedText();
1524                                                 }
1525                                         } else {
1526                                                 $sortkey = $text;
1527                                         }
1528                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1529                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1530                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1531
1532                                         /**
1533                                          * Strip the whitespace Category links produce, see bug 87
1534                                          * @todo We might want to use trim($tmp, "\n") here.
1535                                          */
1536                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1537
1538                                         wfProfileOut( "$fname-category" );
1539                                         continue;
1540                                 }
1541                         }
1542
1543                         if( ( $nt->getPrefixedText() === $selflink ) &&
1544                             ( $nt->getFragment() === '' ) ) {
1545                                 # Self-links are handled specially; generally de-link and change to bold.
1546                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1547                                 continue;
1548                         }
1549
1550                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1551                         if( $ns == NS_MEDIA ) {
1552                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1553                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1554                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1555                                 $this->mOutput->addImage( $nt->getDBkey() );
1556                                 continue;
1557                         } elseif( $ns == NS_SPECIAL ) {
1558                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1559                                 continue;
1560                         } elseif( $ns == NS_IMAGE ) {
1561                                 $img = Image::newFromTitle( $nt );
1562                                 if( $img->exists() ) {
1563                                         // Force a blue link if the file exists; may be a remote
1564                                         // upload on the shared repository, and we want to see its
1565                                         // auto-generated page.
1566                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1567                                         continue;
1568                                 }
1569                         }
1570                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1571                 }
1572                 wfProfileOut( $fname );
1573                 return $s;
1574         }
1575
1576         /**
1577          * Make a link placeholder. The text returned can be later resolved to a real link with
1578          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1579          * parsing of interwiki links, and secondly to allow all extistence checks and
1580          * article length checks (for stub links) to be bundled into a single query.
1581          *
1582          */
1583         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1584                 if ( ! is_object($nt) ) {
1585                         # Fail gracefully
1586                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1587                 } else {
1588                         # Separate the link trail from the rest of the link
1589                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1590
1591                         if ( $nt->isExternal() ) {
1592                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1593                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1594                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1595                         } else {
1596                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1597                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1598                                 $this->mLinkHolders['queries'][] = $query;
1599                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1600                                 $this->mLinkHolders['titles'][] = $nt;
1601
1602                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1603                         }
1604                 }
1605                 return $retVal;
1606         }
1607
1608         /**
1609          * Render a forced-blue link inline; protect against double expansion of
1610          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1611          * Since this little disaster has to split off the trail text to avoid
1612          * breaking URLs in the following text without breaking trails on the
1613          * wiki links, it's been made into a horrible function.
1614          *
1615          * @param Title $nt
1616          * @param string $text
1617          * @param string $query
1618          * @param string $trail
1619          * @param string $prefix
1620          * @return string HTML-wikitext mix oh yuck
1621          */
1622         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1623                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1624                 $sk =& $this->mOptions->getSkin();
1625                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1626                 return $this->armorLinks( $link ) . $trail;
1627         }
1628
1629         /**
1630          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1631          * going to go through further parsing steps before inline URL expansion.
1632          *
1633          * In particular this is important when using action=render, which causes
1634          * full URLs to be included.
1635          *
1636          * Oh man I hate our multi-layer parser!
1637          *
1638          * @param string more-or-less HTML
1639          * @return string less-or-more HTML with NOPARSE bits
1640          */
1641         function armorLinks( $text ) {
1642                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1643                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1644         }
1645
1646         /**
1647          * Return true if subpage links should be expanded on this page.
1648          * @return bool
1649          */
1650         function areSubpagesAllowed() {
1651                 # Some namespaces don't allow subpages
1652                 global $wgNamespacesWithSubpages;
1653                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1654         }
1655
1656         /**
1657          * Handle link to subpage if necessary
1658          * @param string $target the source of the link
1659          * @param string &$text the link text, modified as necessary
1660          * @return string the full name of the link
1661          * @private
1662          */
1663         function maybeDoSubpageLink($target, &$text) {
1664                 # Valid link forms:
1665                 # Foobar -- normal
1666                 # :Foobar -- override special treatment of prefix (images, language links)
1667                 # /Foobar -- convert to CurrentPage/Foobar
1668                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1669                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1670                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1671
1672                 $fname = 'Parser::maybeDoSubpageLink';
1673                 wfProfileIn( $fname );
1674                 $ret = $target; # default return value is no change
1675
1676                 # Some namespaces don't allow subpages,
1677                 # so only perform processing if subpages are allowed
1678                 if( $this->areSubpagesAllowed() ) {
1679                         # Look at the first character
1680                         if( $target != '' && $target{0} == '/' ) {
1681                                 # / at end means we don't want the slash to be shown
1682                                 if( substr( $target, -1, 1 ) == '/' ) {
1683                                         $target = substr( $target, 1, -1 );
1684                                         $noslash = $target;
1685                                 } else {
1686                                         $noslash = substr( $target, 1 );
1687                                 }
1688
1689                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1690                                 if( '' === $text ) {
1691                                         $text = $target;
1692                                 } # this might be changed for ugliness reasons
1693                         } else {
1694                                 # check for .. subpage backlinks
1695                                 $dotdotcount = 0;
1696                                 $nodotdot = $target;
1697                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1698                                         ++$dotdotcount;
1699                                         $nodotdot = substr( $nodotdot, 3 );
1700                                 }
1701                                 if($dotdotcount > 0) {
1702                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1703                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1704                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1705                                                 # / at the end means don't show full path
1706                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1707                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1708                                                         if( '' === $text ) {
1709                                                                 $text = $nodotdot;
1710                                                         }
1711                                                 }
1712                                                 $nodotdot = trim( $nodotdot );
1713                                                 if( $nodotdot != '' ) {
1714                                                         $ret .= '/' . $nodotdot;
1715                                                 }
1716                                         }
1717                                 }
1718                         }
1719                 }
1720
1721                 wfProfileOut( $fname );
1722                 return $ret;
1723         }
1724
1725         /**#@+
1726          * Used by doBlockLevels()
1727          * @private
1728          */
1729         /* private */ function closeParagraph() {
1730                 $result = '';
1731                 if ( '' != $this->mLastSection ) {
1732                         $result = '</' . $this->mLastSection  . ">\n";
1733                 }
1734                 $this->mInPre = false;
1735                 $this->mLastSection = '';
1736                 return $result;
1737         }
1738         # getCommon() returns the length of the longest common substring
1739         # of both arguments, starting at the beginning of both.
1740         #
1741         /* private */ function getCommon( $st1, $st2 ) {
1742                 $fl = strlen( $st1 );
1743                 $shorter = strlen( $st2 );
1744                 if ( $fl < $shorter ) { $shorter = $fl; }
1745
1746                 for ( $i = 0; $i < $shorter; ++$i ) {
1747                         if ( $st1{$i} != $st2{$i} ) { break; }
1748                 }
1749                 return $i;
1750         }
1751         # These next three functions open, continue, and close the list
1752         # element appropriate to the prefix character passed into them.
1753         #
1754         /* private */ function openList( $char ) {
1755                 $result = $this->closeParagraph();
1756
1757                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1758                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1759                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1760                 else if ( ';' == $char ) {
1761                         $result .= '<dl><dt>';
1762                         $this->mDTopen = true;
1763                 }
1764                 else { $result = '<!-- ERR 1 -->'; }
1765
1766                 return $result;
1767         }
1768
1769         /* private */ function nextItem( $char ) {
1770                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1771                 else if ( ':' == $char || ';' == $char ) {
1772                         $close = '</dd>';
1773                         if ( $this->mDTopen ) { $close = '</dt>'; }
1774                         if ( ';' == $char ) {
1775                                 $this->mDTopen = true;
1776                                 return $close . '<dt>';
1777                         } else {
1778                                 $this->mDTopen = false;
1779                                 return $close . '<dd>';
1780                         }
1781                 }
1782                 return '<!-- ERR 2 -->';
1783         }
1784
1785         /* private */ function closeList( $char ) {
1786                 if ( '*' == $char ) { $text = '</li></ul>'; }
1787                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1788                 else if ( ':' == $char ) {
1789                         if ( $this->mDTopen ) {
1790                                 $this->mDTopen = false;
1791                                 $text = '</dt></dl>';
1792                         } else {
1793                                 $text = '</dd></dl>';
1794                         }
1795                 }
1796                 else {  return '<!-- ERR 3 -->'; }
1797                 return $text."\n";
1798         }
1799         /**#@-*/
1800
1801         /**
1802          * Make lists from lines starting with ':', '*', '#', etc.
1803          *
1804          * @private
1805          * @return string the lists rendered as HTML
1806          */
1807         function doBlockLevels( $text, $linestart ) {
1808                 $fname = 'Parser::doBlockLevels';
1809                 wfProfileIn( $fname );
1810
1811                 # Parsing through the text line by line.  The main thing
1812                 # happening here is handling of block-level elements p, pre,
1813                 # and making lists from lines starting with * # : etc.
1814                 #
1815                 $textLines = explode( "\n", $text );
1816
1817                 $lastPrefix = $output = '';
1818                 $this->mDTopen = $inBlockElem = false;
1819                 $prefixLength = 0;
1820                 $paragraphStack = false;
1821
1822                 if ( !$linestart ) {
1823                         $output .= array_shift( $textLines );
1824                 }
1825                 foreach ( $textLines as $oLine ) {
1826                         $lastPrefixLength = strlen( $lastPrefix );
1827                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1828                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1829                         if ( !$this->mInPre ) {
1830                                 # Multiple prefixes may abut each other for nested lists.
1831                                 $prefixLength = strspn( $oLine, '*#:;' );
1832                                 $pref = substr( $oLine, 0, $prefixLength );
1833
1834                                 # eh?
1835                                 $pref2 = str_replace( ';', ':', $pref );
1836                                 $t = substr( $oLine, $prefixLength );
1837                                 $this->mInPre = !empty($preOpenMatch);
1838                         } else {
1839                                 # Don't interpret any other prefixes in preformatted text
1840                                 $prefixLength = 0;
1841                                 $pref = $pref2 = '';
1842                                 $t = $oLine;
1843                         }
1844
1845                         # List generation
1846                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1847                                 # Same as the last item, so no need to deal with nesting or opening stuff
1848                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1849                                 $paragraphStack = false;
1850
1851                                 if ( substr( $pref, -1 ) == ';') {
1852                                         # The one nasty exception: definition lists work like this:
1853                                         # ; title : definition text
1854                                         # So we check for : in the remainder text to split up the
1855                                         # title and definition, without b0rking links.
1856                                         $term = $t2 = '';
1857                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1858                                                 $t = $t2;
1859                                                 $output .= $term . $this->nextItem( ':' );
1860                                         }
1861                                 }
1862                         } elseif( $prefixLength || $lastPrefixLength ) {
1863                                 # Either open or close a level...
1864                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1865                                 $paragraphStack = false;
1866
1867                                 while( $commonPrefixLength < $lastPrefixLength ) {
1868                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1869                                         --$lastPrefixLength;
1870                                 }
1871                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1872                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1873                                 }
1874                                 while ( $prefixLength > $commonPrefixLength ) {
1875                                         $char = substr( $pref, $commonPrefixLength, 1 );
1876                                         $output .= $this->openList( $char );
1877
1878                                         if ( ';' == $char ) {
1879                                                 # FIXME: This is dupe of code above
1880                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1881                                                         $t = $t2;
1882                                                         $output .= $term . $this->nextItem( ':' );
1883                                                 }
1884                                         }
1885                                         ++$commonPrefixLength;
1886                                 }
1887                                 $lastPrefix = $pref2;
1888                         }
1889                         if( 0 == $prefixLength ) {
1890                                 wfProfileIn( "$fname-paragraph" );
1891                                 # No prefix (not in list)--go to paragraph mode
1892                                 // XXX: use a stack for nestable elements like span, table and div
1893                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<center|<\\/tr|<\\/td|<\\/th)/iS', $t );
1894                                 $closematch = preg_match(
1895                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1896                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/center)/iS', $t );
1897                                 if ( $openmatch or $closematch ) {
1898                                         $paragraphStack = false;
1899                                         # TODO bug 5718: paragraph closed
1900                                         $output .= $this->closeParagraph();
1901                                         if ( $preOpenMatch and !$preCloseMatch ) {
1902                                                 $this->mInPre = true;
1903                                         }
1904                                         if ( $closematch ) {
1905                                                 $inBlockElem = false;
1906                                         } else {
1907                                                 $inBlockElem = true;
1908                                         }
1909                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1910                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1911                                                 // pre
1912                                                 if ($this->mLastSection != 'pre') {
1913                                                         $paragraphStack = false;
1914                                                         $output .= $this->closeParagraph().'<pre>';
1915                                                         $this->mLastSection = 'pre';
1916                                                 }
1917                                                 $t = substr( $t, 1 );
1918                                         } else {
1919                                                 // paragraph
1920                                                 if ( '' == trim($t) ) {
1921                                                         if ( $paragraphStack ) {
1922                                                                 $output .= $paragraphStack.'<br />';
1923                                                                 $paragraphStack = false;
1924                                                                 $this->mLastSection = 'p';
1925                                                         } else {
1926                                                                 if ($this->mLastSection != 'p' ) {
1927                                                                         $output .= $this->closeParagraph();
1928                                                                         $this->mLastSection = '';
1929                                                                         $paragraphStack = '<p>';
1930                                                                 } else {
1931                                                                         $paragraphStack = '</p><p>';
1932                                                                 }
1933                                                         }
1934                                                 } else {
1935                                                         if ( $paragraphStack ) {
1936                                                                 $output .= $paragraphStack;
1937                                                                 $paragraphStack = false;
1938                                                                 $this->mLastSection = 'p';
1939                                                         } else if ($this->mLastSection != 'p') {
1940                                                                 $output .= $this->closeParagraph().'<p>';
1941                                                                 $this->mLastSection = 'p';
1942                                                         }
1943                                                 }
1944                                         }
1945                                 }
1946                                 wfProfileOut( "$fname-paragraph" );
1947                         }
1948                         // somewhere above we forget to get out of pre block (bug 785)
1949                         if($preCloseMatch && $this->mInPre) {
1950                                 $this->mInPre = false;
1951                         }
1952                         if ($paragraphStack === false) {
1953                                 $output .= $t."\n";
1954                         }
1955                 }
1956                 while ( $prefixLength ) {
1957                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1958                         --$prefixLength;
1959                 }
1960                 if ( '' != $this->mLastSection ) {
1961                         $output .= '</' . $this->mLastSection . '>';
1962                         $this->mLastSection = '';
1963                 }
1964
1965                 wfProfileOut( $fname );
1966                 return $output;
1967         }
1968
1969         /**
1970          * Split up a string on ':', ignoring any occurences inside tags
1971          * to prevent illegal overlapping.
1972          * @param string $str the string to split
1973          * @param string &$before set to everything before the ':'
1974          * @param string &$after set to everything after the ':'
1975          * return string the position of the ':', or false if none found
1976          */
1977         function findColonNoLinks($str, &$before, &$after) {
1978                 $fname = 'Parser::findColonNoLinks';
1979                 wfProfileIn( $fname );
1980
1981                 $pos = strpos( $str, ':' );
1982                 if( $pos === false ) {
1983                         // Nothing to find!
1984                         wfProfileOut( $fname );
1985                         return false;
1986                 }
1987
1988                 $lt = strpos( $str, '<' );
1989                 if( $lt === false || $lt > $pos ) {
1990                         // Easy; no tag nesting to worry about
1991                         $before = substr( $str, 0, $pos );
1992                         $after = substr( $str, $pos+1 );
1993                         wfProfileOut( $fname );
1994                         return $pos;
1995                 }
1996
1997                 // Ugly state machine to walk through avoiding tags.
1998                 $state = MW_COLON_STATE_TEXT;
1999                 $stack = 0;
2000                 $len = strlen( $str );
2001                 for( $i = 0; $i < $len; $i++ ) {
2002                         $c = $str{$i};
2003
2004                         switch( $state ) {
2005                         // (Using the number is a performance hack for common cases)
2006                         case 0: // MW_COLON_STATE_TEXT:
2007                                 switch( $c ) {
2008                                 case "<":
2009                                         // Could be either a <start> tag or an </end> tag
2010                                         $state = MW_COLON_STATE_TAGSTART;
2011                                         break;
2012                                 case ":":
2013                                         if( $stack == 0 ) {
2014                                                 // We found it!
2015                                                 $before = substr( $str, 0, $i );
2016                                                 $after = substr( $str, $i + 1 );
2017                                                 wfProfileOut( $fname );
2018                                                 return $i;
2019                                         }
2020                                         // Embedded in a tag; don't break it.
2021                                         break;
2022                                 default:
2023                                         // Skip ahead looking for something interesting
2024                                         $colon = strpos( $str, ':', $i );
2025                                         if( $colon === false ) {
2026                                                 // Nothing else interesting
2027                                                 wfProfileOut( $fname );
2028                                                 return false;
2029                                         }
2030                                         $lt = strpos( $str, '<', $i );
2031                                         if( $stack === 0 ) {
2032                                                 if( $lt === false || $colon < $lt ) {
2033                                                         // We found it!
2034                                                         $before = substr( $str, 0, $colon );
2035                                                         $after = substr( $str, $colon + 1 );
2036                                                         wfProfileOut( $fname );
2037                                                         return $i;
2038                                                 }
2039                                         }
2040                                         if( $lt === false ) {
2041                                                 // Nothing else interesting to find; abort!
2042                                                 // We're nested, but there's no close tags left. Abort!
2043                                                 break 2;
2044                                         }
2045                                         // Skip ahead to next tag start
2046                                         $i = $lt;
2047                                         $state = MW_COLON_STATE_TAGSTART;
2048                                 }
2049                                 break;
2050                         case 1: // MW_COLON_STATE_TAG:
2051                                 // In a <tag>
2052                                 switch( $c ) {
2053                                 case ">":
2054                                         $stack++;
2055                                         $state = MW_COLON_STATE_TEXT;
2056                                         break;
2057                                 case "/":
2058                                         // Slash may be followed by >?
2059                                         $state = MW_COLON_STATE_TAGSLASH;
2060                                         break;
2061                                 default:
2062                                         // ignore
2063                                 }
2064                                 break;
2065                         case 2: // MW_COLON_STATE_TAGSTART:
2066                                 switch( $c ) {
2067                                 case "/":
2068                                         $state = MW_COLON_STATE_CLOSETAG;
2069                                         break;
2070                                 case "!":
2071                                         $state = MW_COLON_STATE_COMMENT;
2072                                         break;
2073                                 case ">":
2074                                         // Illegal early close? This shouldn't happen D:
2075                                         $state = MW_COLON_STATE_TEXT;
2076                                         break;
2077                                 default:
2078                                         $state = MW_COLON_STATE_TAG;
2079                                 }
2080                                 break;
2081                         case 3: // MW_COLON_STATE_CLOSETAG:
2082                                 // In a </tag>
2083                                 if( $c == ">" ) {
2084                                         $stack--;
2085                                         if( $stack < 0 ) {
2086                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2087                                                 wfProfileOut( $fname );
2088                                                 return false;
2089                                         }
2090                                         $state = MW_COLON_STATE_TEXT;
2091                                 }
2092                                 break;
2093                         case MW_COLON_STATE_TAGSLASH:
2094                                 if( $c == ">" ) {
2095                                         // Yes, a self-closed tag <blah/>
2096                                         $state = MW_COLON_STATE_TEXT;
2097                                 } else {
2098                                         // Probably we're jumping the gun, and this is an attribute
2099                                         $state = MW_COLON_STATE_TAG;
2100                                 }
2101                                 break;
2102                         case 5: // MW_COLON_STATE_COMMENT:
2103                                 if( $c == "-" ) {
2104                                         $state = MW_COLON_STATE_COMMENTDASH;
2105                                 }
2106                                 break;
2107                         case MW_COLON_STATE_COMMENTDASH:
2108                                 if( $c == "-" ) {
2109                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2110                                 } else {
2111                                         $state = MW_COLON_STATE_COMMENT;
2112                                 }
2113                                 break;
2114                         case MW_COLON_STATE_COMMENTDASHDASH:
2115                                 if( $c == ">" ) {
2116                                         $state = MW_COLON_STATE_TEXT;
2117                                 } else {
2118                                         $state = MW_COLON_STATE_COMMENT;
2119                                 }
2120                                 break;
2121                         default:
2122                                 wfDebugDieBacktrace( "State machine error in $fname" );
2123                         }
2124                 }
2125                 if( $stack > 0 ) {
2126                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2127                         return false;
2128                 }
2129                 wfProfileOut( $fname );
2130                 return false;
2131         }
2132
2133         /**
2134          * Return value of a magic variable (like PAGENAME)
2135          *
2136          * @private
2137          */
2138         function getVariableValue( $index ) {
2139                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2140
2141                 /**
2142                  * Some of these require message or data lookups and can be
2143                  * expensive to check many times.
2144                  */
2145                 static $varCache = array();
2146                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2147                         if ( isset( $varCache[$index] ) )
2148                                 return $varCache[$index];
2149
2150                 $ts = time();
2151                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2152
2153                 switch ( $index ) {
2154                         case MAG_CURRENTMONTH:
2155                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2156                         case MAG_CURRENTMONTHNAME:
2157                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2158                         case MAG_CURRENTMONTHNAMEGEN:
2159                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2160                         case MAG_CURRENTMONTHABBREV:
2161                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2162                         case MAG_CURRENTDAY:
2163                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2164                         case MAG_CURRENTDAY2:
2165                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2166                         case MAG_PAGENAME:
2167                                 return $this->mTitle->getText();
2168                         case MAG_PAGENAMEE:
2169                                 return $this->mTitle->getPartialURL();
2170                         case MAG_FULLPAGENAME:
2171                                 return $this->mTitle->getPrefixedText();
2172                         case MAG_FULLPAGENAMEE:
2173                                 return $this->mTitle->getPrefixedURL();
2174                         case MAG_SUBPAGENAME:
2175                                 return $this->mTitle->getSubpageText();
2176                         case MAG_SUBPAGENAMEE:
2177                                 return $this->mTitle->getSubpageUrlForm();
2178                         case MAG_BASEPAGENAME:
2179                                 return $this->mTitle->getBaseText();
2180                         case MAG_BASEPAGENAMEE:
2181                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2182                         case MAG_TALKPAGENAME:
2183                                 if( $this->mTitle->canTalk() ) {
2184                                         $talkPage = $this->mTitle->getTalkPage();
2185                                         return $talkPage->getPrefixedText();
2186                                 } else {
2187                                         return '';
2188                                 }
2189                         case MAG_TALKPAGENAMEE:
2190                                 if( $this->mTitle->canTalk() ) {
2191                                         $talkPage = $this->mTitle->getTalkPage();
2192                                         return $talkPage->getPrefixedUrl();
2193                                 } else {
2194                                         return '';
2195                                 }
2196                         case MAG_SUBJECTPAGENAME:
2197                                 $subjPage = $this->mTitle->getSubjectPage();
2198                                 return $subjPage->getPrefixedText();
2199                         case MAG_SUBJECTPAGENAMEE:
2200                                 $subjPage = $this->mTitle->getSubjectPage();
2201                                 return $subjPage->getPrefixedUrl();
2202                         case MAG_REVISIONID:
2203                                 return $this->mRevisionId;
2204                         case MAG_NAMESPACE:
2205                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2206                         case MAG_NAMESPACEE:
2207                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2208                         case MAG_TALKSPACE:
2209                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2210                         case MAG_TALKSPACEE:
2211                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2212                         case MAG_SUBJECTSPACE:
2213                                 return $this->mTitle->getSubjectNsText();
2214                         case MAG_SUBJECTSPACEE:
2215                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2216                         case MAG_CURRENTDAYNAME:
2217                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2218                         case MAG_CURRENTYEAR:
2219                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2220                         case MAG_CURRENTTIME:
2221                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2222                         case MAG_CURRENTWEEK:
2223                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2224                                 // int to remove the padding
2225                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2226                         case MAG_CURRENTDOW:
2227                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2228                         case MAG_NUMBEROFARTICLES:
2229                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2230                         case MAG_NUMBEROFFILES:
2231                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2232                         case MAG_NUMBEROFUSERS:
2233                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfUsers() );
2234                         case MAG_NUMBEROFPAGES:
2235                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfPages() );
2236                         case MAG_CURRENTTIMESTAMP:
2237                                 return $varCache[$index] = wfTimestampNow();
2238                         case MAG_CURRENTVERSION:
2239                                 global $wgVersion;
2240                                 return $wgVersion;
2241                         case MAG_SITENAME:
2242                                 return $wgSitename;
2243                         case MAG_SERVER:
2244                                 return $wgServer;
2245                         case MAG_SERVERNAME:
2246                                 return $wgServerName;
2247                         case MAG_SCRIPTPATH:
2248                                 return $wgScriptPath;
2249                         case MAG_DIRECTIONMARK:
2250                                 return $wgContLang->getDirMark();
2251                         default:
2252                                 $ret = null;
2253                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2254                                         return $ret;
2255                                 else
2256                                         return null;
2257                 }
2258         }
2259
2260         /**
2261          * initialise the magic variables (like CURRENTMONTHNAME)
2262          *
2263          * @private
2264          */
2265         function initialiseVariables() {
2266                 $fname = 'Parser::initialiseVariables';
2267                 wfProfileIn( $fname );
2268                 global $wgVariableIDs;
2269                 $this->mVariables = array();
2270                 foreach ( $wgVariableIDs as $id ) {
2271                         $mw =& MagicWord::get( $id );
2272                         $mw->addToArray( $this->mVariables, $id );
2273                 }
2274                 wfProfileOut( $fname );
2275         }
2276
2277         /**
2278          * parse any parentheses in format ((title|part|part))
2279          * and call callbacks to get a replacement text for any found piece
2280          *
2281          * @param string $text The text to parse
2282          * @param array $callbacks rules in form:
2283          *     '{' => array(                            # opening parentheses
2284          *                                      'end' => '}',   # closing parentheses
2285          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2286          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2287          *                                                                )
2288          *                                      )
2289          * @private
2290          */
2291         function replace_callback ($text, $callbacks) {
2292                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2293                 $lastOpeningBrace = -1;                 # last not closed parentheses
2294
2295                 for ($i = 0; $i < strlen($text); $i++) {
2296                         # check for any opening brace
2297                         $rule = null;
2298                         $nextPos = -1;
2299                         foreach ($callbacks as $key => $value) {
2300                                 $pos = strpos ($text, $key, $i);
2301                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2302                                         $rule = $value;
2303                                         $nextPos = $pos;
2304                                 }
2305                         }
2306
2307                         if ($lastOpeningBrace >= 0) {
2308                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2309
2310                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2311                                         $rule = null;
2312                                         $nextPos = $pos;
2313                                 }
2314
2315                                 $pos = strpos ($text, '|', $i);
2316
2317                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2318                                         $rule = null;
2319                                         $nextPos = $pos;
2320                                 }
2321                         }
2322
2323                         if ($nextPos == -1)
2324                                 break;
2325
2326                         $i = $nextPos;
2327
2328                         # found openning brace, lets add it to parentheses stack
2329                         if (null != $rule) {
2330                                 $piece = array('brace' => $text[$i],
2331                                                            'braceEnd' => $rule['end'],
2332                                                            'count' => 1,
2333                                                            'title' => '',
2334                                                            'parts' => null);
2335
2336                                 # count openning brace characters
2337                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2338                                         $piece['count']++;
2339                                         $i++;
2340                                 }
2341
2342                                 $piece['startAt'] = $i+1;
2343                                 $piece['partStart'] = $i+1;
2344
2345                                 # we need to add to stack only if openning brace count is enough for any given rule
2346                                 foreach ($rule['cb'] as $cnt => $fn) {
2347                                         if ($piece['count'] >= $cnt) {
2348                                                 $lastOpeningBrace ++;
2349                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2350                                                 break;
2351                                         }
2352                                 }
2353
2354                                 continue;
2355                         }
2356                         else if ($lastOpeningBrace >= 0) {
2357                                 # first check if it is a closing brace
2358                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2359                                         # lets check if it is enough characters for closing brace
2360                                         $count = 1;
2361                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2362                                                 $count++;
2363
2364                                         # if there are more closing parentheses than opening ones, we parse less
2365                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2366                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2367
2368                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2369                                         $matchingCount = 0;
2370                                         $matchingCallback = null;
2371                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2372                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2373                                                         $matchingCount = $cnt;
2374                                                         $matchingCallback = $fn;
2375                                                 }
2376                                         }
2377
2378                                         if ($matchingCount == 0) {
2379                                                 $i += $count - 1;
2380                                                 continue;
2381                                         }
2382
2383                                         # lets set a title or last part (if '|' was found)
2384                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2385                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2386                                         else
2387                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2388
2389                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2390                                         $pieceEnd = $i + $matchingCount;
2391
2392                                         if( is_callable( $matchingCallback ) ) {
2393                                                 $cbArgs = array (
2394                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2395                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2396                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2397                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2398                                                                                  );
2399                                                 # finally we can call a user callback and replace piece of text
2400                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2401                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2402                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2403                                         }
2404                                         else {
2405                                                 # null value for callback means that parentheses should be parsed, but not replaced
2406                                                 $i += $matchingCount - 1;
2407                                         }
2408
2409                                         # reset last openning parentheses, but keep it in case there are unused characters
2410                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2411                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2412                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2413                                                                    'title' => '',
2414                                                                    'parts' => null,
2415                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2416                                         $openingBraceStack[$lastOpeningBrace--] = null;
2417
2418                                         if ($matchingCount < $piece['count']) {
2419                                                 $piece['count'] -= $matchingCount;
2420                                                 $piece['startAt'] -= $matchingCount;
2421                                                 $piece['partStart'] = $piece['startAt'];
2422                                                 # do we still qualify for any callback with remaining count?
2423                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2424                                                         if ($piece['count'] >= $cnt) {
2425                                                                 $lastOpeningBrace ++;
2426                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2427                                                                 break;
2428                                                         }
2429                                                 }
2430                                         }
2431                                         continue;
2432                                 }
2433
2434                                 # lets set a title if it is a first separator, or next part otherwise
2435                                 if ($text[$i] == '|') {
2436                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2437                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2438                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2439                                         }
2440                                         else
2441                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2442
2443                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2444                                 }
2445                         }
2446                 }
2447
2448                 return $text;
2449         }
2450
2451         /**
2452          * Replace magic variables, templates, and template arguments
2453          * with the appropriate text. Templates are substituted recursively,
2454          * taking care to avoid infinite loops.
2455          *
2456          * Note that the substitution depends on value of $mOutputType:
2457          *  OT_WIKI: only {{subst:}} templates
2458          *  OT_MSG: only magic variables
2459          *  OT_HTML: all templates and magic variables
2460          *
2461          * @param string $tex The text to transform
2462          * @param array $args Key-value pairs representing template parameters to substitute
2463          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2464          * @private
2465          */
2466         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2467                 # Prevent too big inclusions
2468                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2469                         return $text;
2470                 }
2471
2472                 $fname = 'Parser::replaceVariables';
2473                 wfProfileIn( $fname );
2474
2475                 # This function is called recursively. To keep track of arguments we need a stack:
2476                 array_push( $this->mArgStack, $args );
2477
2478                 $braceCallbacks = array();
2479                 if ( !$argsOnly ) {
2480                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2481                 }
2482                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2483                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2484                 }
2485                 $callbacks = array();
2486                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2487                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2488                 $text = $this->replace_callback ($text, $callbacks);
2489
2490                 array_pop( $this->mArgStack );
2491
2492                 wfProfileOut( $fname );
2493                 return $text;
2494         }
2495
2496         /**
2497          * Replace magic variables
2498          * @private
2499          */
2500         function variableSubstitution( $matches ) {
2501                 $fname = 'Parser::variableSubstitution';
2502                 $varname = $matches[1];
2503                 wfProfileIn( $fname );
2504                 if ( !$this->mVariables ) {
2505                         $this->initialiseVariables();
2506                 }
2507                 $skip = false;
2508                 if ( $this->mOutputType == OT_WIKI ) {
2509                         # Do only magic variables prefixed by SUBST
2510                         $mwSubst =& MagicWord::get( MAG_SUBST );
2511                         if (!$mwSubst->matchStartAndRemove( $varname ))
2512                                 $skip = true;
2513                         # Note that if we don't substitute the variable below,
2514                         # we don't remove the {{subst:}} magic word, in case
2515                         # it is a template rather than a magic variable.
2516                 }
2517                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2518                         $id = $this->mVariables[$varname];
2519                         $text = $this->getVariableValue( $id );
2520                         $this->mOutput->mContainsOldMagic = true;
2521                 } else {
2522                         $text = $matches[0];
2523                 }
2524                 wfProfileOut( $fname );
2525                 return $text;
2526         }
2527
2528         # Split template arguments
2529         function getTemplateArgs( $argsString ) {
2530                 if ( $argsString === '' ) {
2531                         return array();
2532                 }
2533
2534                 $args = explode( '|', substr( $argsString, 1 ) );
2535
2536                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2537                 # merged with the next arg because the '|' character between belongs
2538                 # to the link syntax and not the template parameter syntax.
2539                 $argc = count($args);
2540
2541                 for ( $i = 0; $i < $argc-1; $i++ ) {
2542                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2543                                 $args[$i] .= '|'.$args[$i+1];
2544                                 array_splice($args, $i+1, 1);
2545                                 $i--;
2546                                 $argc--;
2547                         }
2548                 }
2549
2550                 return $args;
2551         }
2552
2553         /**
2554          * Return the text of a template, after recursively
2555          * replacing any variables or templates within the template.
2556          *
2557          * @param array $piece The parts of the template
2558          *  $piece['text']: matched text
2559          *  $piece['title']: the title, i.e. the part before the |
2560          *  $piece['parts']: the parameter array
2561          * @return string the text of the template
2562          * @private
2563          */
2564         function braceSubstitution( $piece ) {
2565                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $action;
2566                 $fname = 'Parser::braceSubstitution';
2567                 wfProfileIn( $fname );
2568
2569                 # Flags
2570                 $found = false;             # $text has been filled
2571                 $nowiki = false;            # wiki markup in $text should be escaped
2572                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2573                 $noargs = false;            # Don't replace triple-brace arguments in $text
2574                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2575                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2576                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2577
2578                 # Title object, where $text came from
2579                 $title = NULL;
2580
2581                 $linestart = '';
2582
2583                 # $part1 is the bit before the first |, and must contain only title characters
2584                 # $args is a list of arguments, starting from index 0, not including $part1
2585
2586                 $part1 = $piece['title'];
2587                 # If the third subpattern matched anything, it will start with |
2588
2589                 if (null == $piece['parts']) {
2590                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2591                         if ($replaceWith != $piece['text']) {
2592                                 $text = $replaceWith;
2593                                 $found = true;
2594                                 $noparse = true;
2595                                 $noargs = true;
2596                         }
2597                 }
2598
2599                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2600                 $argc = count( $args );
2601
2602                 # SUBST
2603                 if ( !$found ) {
2604                         $mwSubst =& MagicWord::get( MAG_SUBST );
2605                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2606                                 # One of two possibilities is true:
2607                                 # 1) Found SUBST but not in the PST phase
2608                                 # 2) Didn't find SUBST and in the PST phase
2609                                 # In either case, return without further processing
2610                                 $text = $piece['text'];
2611                                 $found = true;
2612                                 $noparse = true;
2613                                 $noargs = true;
2614                         }
2615                 }
2616
2617                 # MSG, MSGNW, INT and RAW
2618                 if ( !$found ) {
2619                         # Check for MSGNW:
2620                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2621                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2622                                 $nowiki = true;
2623                         } else {
2624                                 # Remove obsolete MSG:
2625                                 $mwMsg =& MagicWord::get( MAG_MSG );
2626                                 $mwMsg->matchStartAndRemove( $part1 );
2627                         }
2628
2629                         # Check for RAW:
2630                         $mwRaw =& MagicWord::get( MAG_RAW );
2631                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2632                                 $forceRawInterwiki = true;
2633                         }
2634
2635                         # Check if it is an internal message
2636                         $mwInt =& MagicWord::get( MAG_INT );
2637                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2638                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2639                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2640                                         $found = true;
2641                                 }
2642                         }
2643                 }
2644
2645                 # NS
2646                 if ( !$found ) {
2647                         # Check for NS: (namespace expansion)
2648                         $mwNs = MagicWord::get( MAG_NS );
2649                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2650                                 if ( intval( $part1 ) || $part1 == "0" ) {
2651                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2652                                         $found = true;
2653                                 } else {
2654                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2655                                         if ( !is_null( $index ) ) {
2656                                                 $text = $linestart . $wgContLang->getNsText( $index );
2657                                                 $found = true;
2658                                         }
2659                                 }
2660                         }
2661                 }
2662
2663                 # URLENCODE
2664                 if( !$found ) {
2665                         $urlencode =& MagicWord::get( MAG_URLENCODE );
2666                         if( $urlencode->matchStartAndRemove( $part1 ) ) {
2667                                 $text = $linestart . urlencode( $part1 );
2668                                 $found = true;
2669                         }
2670                 }
2671
2672                 # LCFIRST, UCFIRST, LC and UC
2673                 if ( !$found ) {
2674                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2675                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2676                         $lc =& MagicWord::get( MAG_LC );
2677                         $uc =& MagicWord::get( MAG_UC );
2678                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2679                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2680                                 $found = true;
2681                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2682                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2683                                 $found = true;
2684                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2685                                 $text = $linestart . $wgContLang->lc( $part1 );
2686                                 $found = true;
2687                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2688                                  $text = $linestart . $wgContLang->uc( $part1 );
2689                                  $found = true;
2690                         }
2691                 }
2692
2693                 # LOCALURL and FULLURL
2694                 if ( !$found ) {
2695                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2696                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2697                         $mwFull =& MagicWord::get( MAG_FULLURL );
2698                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2699
2700
2701                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2702                                 $func = 'getLocalURL';
2703                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2704                                 $func = 'escapeLocalURL';
2705                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2706                                 $func = 'getFullURL';
2707                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2708                                 $func = 'escapeFullURL';
2709                         } else {
2710                                 $func = false;
2711                         }
2712
2713                         if ( $func !== false ) {
2714                                 $title = Title::newFromText( $part1 );
2715                                 # Due to order of execution of a lot of bits, the values might be encoded
2716                                 # before arriving here; if that's true, then the title can't be created
2717                                 # and the variable will fail. If we can't get a decent title from the first
2718                                 # attempt, url-decode and try for a second.
2719                                 if( is_null( $title ) )
2720                                         $title = Title::newFromUrl( urldecode( $part1 ) );
2721                                 if ( !is_null( $title ) ) {
2722                                         if ( $argc > 0 ) {
2723                                                 $text = $linestart . $title->$func( $args[0] );
2724                                         } else {
2725                                                 $text = $linestart . $title->$func();
2726                                         }
2727                                         $found = true;
2728                                 }
2729                         }
2730                 }
2731
2732                 $lang = $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
2733                 # GRAMMAR
2734                 if ( !$found && $argc == 1 ) {
2735                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2736                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2737                                 $text = $linestart . $lang->convertGrammar( $args[0], $part1 );
2738                                 $found = true;
2739                         }
2740                 }
2741
2742                 # PLURAL
2743                 if ( !$found && $argc >= 2 ) {
2744                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2745                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2746                                 if ($argc==2) {$args[2]=$args[1];}
2747                                 $text = $linestart . $lang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2748                                 $found = true;
2749                         }
2750                 }
2751
2752                 # DISPLAYTITLE
2753                 if ( !$found && $argc == 1 && $wgAllowDisplayTitle ) {
2754                         $mwDT =& MagicWord::get( MAG_DISPLAYTITLE );
2755                         if ( $mwDT->matchStartAndRemove( $part1 ) ) {
2756
2757                                 # Set title in parser output object
2758                                 $param = $args[0];
2759                                 $parserOptions = new ParserOptions;
2760                                 $local_parser = new Parser ();
2761                                 $t2 = $local_parser->parse ( $param, $this->mTitle, $parserOptions, false );
2762                                 $this->mOutput->mHTMLtitle = $t2->GetText();
2763
2764                                 # Add subtitle
2765                                 $t = $this->mTitle->getPrefixedText();
2766                                 $this->mOutput->mSubtitle .= wfMsg('displaytitle', $t);
2767                                 $text = "" ;
2768                                 $found = true ;
2769                         }
2770                 }
2771
2772                 # NUMBEROFPAGES, NUMBEROFUSERS, NUMBEROFARTICLES, and NUMBEROFFILES
2773                 if( !$found ) {
2774                         $mwWordsToCheck = array( MAG_NUMBEROFPAGES => 'wfNumberOfPages',
2775                                                                          MAG_NUMBEROFUSERS => 'wfNumberOfUsers',
2776                                                                          MAG_NUMBEROFARTICLES => 'wfNumberOfArticles',
2777                                                                          MAG_NUMBEROFFILES => 'wfNumberOfFiles' );
2778                         foreach( $mwWordsToCheck as $word => $func ) {
2779                                 $mwCurrentWord =& MagicWord::get( $word );
2780                                 if( $mwCurrentWord->matchStartAndRemove( $part1 ) ) {
2781                                         $mwRawSuffix =& MagicWord::get( MAG_RAWSUFFIX );
2782                                         if( $mwRawSuffix->match( $args[0] ) ) {
2783                                                 # Raw and unformatted
2784                                                 $text = $linestart . call_user_func( $func );
2785                                         } else {
2786                                                 # Formatted according to the content default
2787                                                 $text = $linestart . $wgContLang->formatNum( call_user_func( $func ) );
2788                                         }
2789                                         $found = true;
2790                                 }
2791                         }
2792                 }
2793
2794                 # #LANGUAGE:
2795                 if( !$found ) {
2796                         $mwLanguage =& MagicWord::get( MAG_LANGUAGE );
2797                         if( $mwLanguage->matchStartAndRemove( $part1 ) ) {
2798                                 $lang = $wgContLang->getLanguageName( strtolower( $part1 ) );
2799                                 $text = $linestart . ( $lang != '' ? $lang : $part1 );
2800                                 $found = true;
2801                         }
2802                 }
2803
2804                 # Extensions
2805                 if ( !$found && substr( $part1, 0, 1 ) == '#' ) {
2806                         $colonPos = strpos( $part1, ':' );
2807                         if ( $colonPos !== false ) {
2808                                 $function = strtolower( substr( $part1, 1, $colonPos - 1 ) );
2809                                 if ( isset( $this->mFunctionHooks[$function] ) ) {
2810                                         $funcArgs = array_map( 'trim', $args );
2811                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2812                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2813                                         $found = true;
2814
2815                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2816                                         //$noargs = true;
2817                                         //$noparse = true;
2818
2819                                         if ( is_array( $result ) ) {
2820                                                 $text = $linestart . $result[0];
2821                                                 unset( $result[0] );
2822
2823                                                 // Extract flags into the local scope
2824                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2825                                                 extract( $result );
2826                                         } else {
2827                                                 $text = $linestart . $result;
2828                                         }
2829                                 }
2830                         }
2831                 }
2832
2833                 # Template table test
2834
2835                 # Did we encounter this template already? If yes, it is in the cache
2836                 # and we need to check for loops.
2837                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2838                         $found = true;
2839
2840                         # Infinite loop test
2841                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2842                                 $noparse = true;
2843                                 $noargs = true;
2844                                 $found = true;
2845                                 $text = $linestart .
2846                                         '{{' . $part1 . '}}' .
2847                                         '<!-- WARNING: template loop detected -->';
2848                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2849                         } else {
2850                                 # set $text to cached message.
2851                                 $text = $linestart . $this->mTemplates[$piece['title']];
2852                         }
2853                 }
2854
2855                 # Load from database
2856                 $lastPathLevel = $this->mTemplatePath;
2857                 if ( !$found ) {
2858                         $ns = NS_TEMPLATE;
2859                         # declaring $subpage directly in the function call
2860                         # does not work correctly with references and breaks
2861                         # {{/subpage}}-style inclusions
2862                         $subpage = '';
2863                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2864                         if ($subpage !== '') {
2865                                 $ns = $this->mTitle->getNamespace();
2866                         }
2867                         $title = Title::newFromText( $part1, $ns );
2868
2869                         if ( !is_null( $title ) ) {
2870                                 if ( !$title->isExternal() ) {
2871                                         # Check for excessive inclusion
2872                                         $dbk = $title->getPrefixedDBkey();
2873                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2874                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->mOutputType != OT_WIKI ) {
2875                                                         $text = SpecialPage::capturePath( $title );
2876                                                         if ( is_string( $text ) ) {
2877                                                                 $found = true;
2878                                                                 $noparse = true;
2879                                                                 $noargs = true;
2880                                                                 $isHTML = true;
2881                                                                 $this->disableCache();
2882                                                         }
2883                                                 } else {
2884                                                         $articleContent = $this->fetchTemplate( $title );
2885                                                         if ( $articleContent !== false ) {
2886                                                                 $found = true;
2887                                                                 $text = $articleContent;
2888                                                                 $replaceHeadings = true;
2889                                                         }
2890                                                 }
2891                                         }
2892
2893                                         # If the title is valid but undisplayable, make a link to it
2894                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2895                                                 $text = '[['.$title->getPrefixedText().']]';
2896                                                 $found = true;
2897                                         }
2898                                 } elseif ( $title->isTrans() ) {
2899                                         // Interwiki transclusion
2900                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2901                                                 $text = $this->interwikiTransclude( $title, 'render' );
2902                                                 $isHTML = true;
2903                                                 $noparse = true;
2904                                         } else {
2905                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2906                                                 $replaceHeadings = true;
2907                                         }
2908                                         $found = true;
2909                                 }
2910
2911                                 # Template cache array insertion
2912                                 # Use the original $piece['title'] not the mangled $part1, so that
2913                                 # modifiers such as RAW: produce separate cache entries
2914                                 if( $found ) {
2915                                         if( $isHTML ) {
2916                                                 // A special page; don't store it in the template cache.
2917                                         } else {
2918                                                 $this->mTemplates[$piece['title']] = $text;
2919                                         }
2920                                         $text = $linestart . $text;
2921                                 }
2922                         }
2923                 }
2924
2925                 # Recursive parsing, escaping and link table handling
2926                 # Only for HTML output
2927                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2928                         $text = wfEscapeWikiText( $text );
2929                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2930                         if ( $noargs ) {
2931                                 $assocArgs = array();
2932                         } else {
2933                                 # Clean up argument array
2934                                 $assocArgs = array();
2935                                 $index = 1;
2936                                 foreach( $args as $arg ) {
2937                                         $eqpos = strpos( $arg, '=' );
2938                                         if ( $eqpos === false ) {
2939                                                 $assocArgs[$index++] = $arg;
2940                                         } else {
2941                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2942                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2943                                                 if ( $value === false ) {
2944                                                         $value = '';
2945                                                 }
2946                                                 if ( $name !== false ) {
2947                                                         $assocArgs[$name] = $value;
2948                                                 }
2949                                         }
2950                                 }
2951
2952                                 # Add a new element to the templace recursion path
2953                                 $this->mTemplatePath[$part1] = 1;
2954                         }
2955
2956                         if ( !$noparse ) {
2957                                 # If there are any <onlyinclude> tags, only include them
2958                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2959                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2960                                         $text = '';
2961                                         foreach ($m[1] as $piece)
2962                                                 $text .= $piece;
2963                                 }
2964                                 # Remove <noinclude> sections and <includeonly> tags
2965                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2966                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2967
2968                                 if( $this->mOutputType == OT_HTML ) {
2969                                         # Strip <nowiki>, <pre>, etc.
2970                                         $text = $this->strip( $text, $this->mStripState );
2971                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2972                                 }
2973                                 $text = $this->replaceVariables( $text, $assocArgs );
2974
2975                                 # If the template begins with a table or block-level
2976                                 # element, it should be treated as beginning a new line.
2977                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2978                                         $text = "\n" . $text;
2979                                 }
2980                         } elseif ( !$noargs ) {
2981                                 # $noparse and !$noargs
2982                                 # Just replace the arguments, not any double-brace items
2983                                 # This is used for rendered interwiki transclusion
2984                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2985                         }
2986                 }
2987                 # Prune lower levels off the recursion check path
2988                 $this->mTemplatePath = $lastPathLevel;
2989
2990                 if ( !$found ) {
2991                         wfProfileOut( $fname );
2992                         return $piece['text'];
2993                 } else {
2994                         if ( $isHTML ) {
2995                                 # Replace raw HTML by a placeholder
2996                                 # Add a blank line preceding, to prevent it from mucking up
2997                                 # immediately preceding headings
2998                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2999                         } else {
3000                                 # replace ==section headers==
3001                                 # XXX this needs to go away once we have a better parser.
3002                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
3003                                         if( !is_null( $title ) )
3004                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3005                                         else
3006                                                 $encodedname = base64_encode("");
3007                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3008                                                 PREG_SPLIT_DELIM_CAPTURE);
3009                                         $text = '';
3010                                         $nsec = 0;
3011                                         for( $i = 0; $i < count($m); $i += 2 ) {
3012                                                 $text .= $m[$i];
3013                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3014                                                 $hl = $m[$i + 1];
3015                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3016                                                         $text .= $hl;
3017                                                         continue;
3018                                                 }
3019                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3020                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3021                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3022
3023                                                 $nsec++;
3024                                         }
3025                                 }
3026                         }
3027                 }
3028
3029                 # Prune lower levels off the recursion check path
3030                 $this->mTemplatePath = $lastPathLevel;
3031
3032                 if ( !$found ) {
3033                         wfProfileOut( $fname );
3034                         return $piece['text'];
3035                 } else {
3036                         wfProfileOut( $fname );
3037                         return $text;
3038                 }
3039         }
3040
3041         /**
3042          * Fetch the unparsed text of a template and register a reference to it.
3043          */
3044         function fetchTemplate( $title ) {
3045                 $text = false;
3046                 // Loop to fetch the article, with up to 1 redirect
3047                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3048                         $rev = Revision::newFromTitle( $title );
3049                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3050                         if ( !$rev ) {
3051                                 break;
3052                         }
3053                         $text = $rev->getText();
3054                         if ( $text === false ) {
3055                                 break;
3056                         }
3057                         // Redirect?
3058                         $title = Title::newFromRedirect( $text );
3059                 }
3060                 return $text;
3061         }
3062
3063         /**
3064          * Transclude an interwiki link.
3065          */
3066         function interwikiTransclude( $title, $action ) {
3067                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
3068
3069                 if (!$wgEnableScaryTranscluding)
3070                         return wfMsg('scarytranscludedisabled');
3071
3072                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
3073                 // But we'll handle it generally anyway
3074                 if ( $title->getNamespace() ) {
3075                         // Use the canonical namespace, which should work anywhere
3076                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
3077                 } else {
3078                         $articleName = $title->getDBkey();
3079                 }
3080
3081                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
3082                 $url .= "?action=$action";
3083                 if (strlen($url) > 255)
3084                         return wfMsg('scarytranscludetoolong');
3085                 return $this->fetchScaryTemplateMaybeFromCache($url);
3086         }
3087
3088         function fetchScaryTemplateMaybeFromCache($url) {
3089                 global $wgTranscludeCacheExpiry;
3090                 $dbr =& wfGetDB(DB_SLAVE);
3091                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3092                                 array('tc_url' => $url));
3093                 if ($obj) {
3094                         $time = $obj->tc_time;
3095                         $text = $obj->tc_contents;
3096                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3097                                 return $text;
3098                         }
3099                 }
3100
3101                 $text = wfGetHTTP($url);
3102                 if (!$text)
3103                         return wfMsg('scarytranscludefailed', $url);
3104
3105                 $dbw =& wfGetDB(DB_MASTER);
3106                 $dbw->replace('transcache', array('tc_url'), array(
3107                         'tc_url' => $url,
3108                         'tc_time' => time(),
3109                         'tc_contents' => $text));
3110                 return $text;
3111         }
3112
3113
3114         /**
3115          * Triple brace replacement -- used for template arguments
3116          * @private
3117          */
3118         function argSubstitution( $matches ) {
3119                 $arg = trim( $matches['title'] );
3120                 $text = $matches['text'];
3121                 $inputArgs = end( $this->mArgStack );
3122
3123                 if ( array_key_exists( $arg, $inputArgs ) ) {
3124                         $text = $inputArgs[$arg];
3125                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
3126                         $text = $matches['parts'][0];
3127                 }
3128
3129                 return $text;
3130         }
3131
3132         /**
3133          * Returns true if the function is allowed to include this entity
3134          * @private
3135          */
3136         function incrementIncludeCount( $dbk ) {
3137                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
3138                         $this->mIncludeCount[$dbk] = 0;
3139                 }
3140                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
3141                         return true;
3142                 } else {
3143                         return false;
3144                 }
3145         }
3146
3147         /**
3148          * Detect __TOC__ magic word and set a placeholder
3149          */
3150         function stripToc( $text ) {
3151                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3152                 # do not add TOC
3153                 $mw = MagicWord::get( MAG_NOTOC );
3154                 if( $mw->matchAndRemove( $text ) ) {
3155                         $this->mShowToc = false;
3156                 }
3157
3158                 $mw = MagicWord::get( MAG_TOC );
3159                 if( $mw->match( $text ) ) {
3160                         $this->mShowToc = true;
3161                         $this->mForceTocPosition = true;
3162
3163                         // Set a placeholder. At the end we'll fill it in with the TOC.
3164                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3165
3166                         // Only keep the first one.
3167                         $text = $mw->replace( '', $text );
3168                 }
3169                 return $text;
3170         }
3171
3172         /**
3173          * This function accomplishes several tasks:
3174          * 1) Auto-number headings if that option is enabled
3175          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3176          * 3) Add a Table of contents on the top for users who have enabled the option
3177          * 4) Auto-anchor headings
3178          *
3179          * It loops through all headlines, collects the necessary data, then splits up the
3180          * string and re-inserts the newly formatted headlines.
3181          *
3182          * @param string $text
3183          * @param boolean $isMain
3184          * @private
3185          */
3186         function formatHeadings( $text, $isMain=true ) {
3187                 global $wgMaxTocLevel, $wgContLang;
3188
3189                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3190                 if( !$this->mTitle->userCanEdit() ) {
3191                         $showEditLink = 0;
3192                 } else {
3193                         $showEditLink = $this->mOptions->getEditSection();
3194                 }
3195
3196                 # Inhibit editsection links if requested in the page
3197                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
3198                 if( $esw->matchAndRemove( $text ) ) {
3199                         $showEditLink = 0;
3200                 }
3201
3202                 # Get all headlines for numbering them and adding funky stuff like [edit]
3203                 # links - this is for later, but we need the number of headlines right now
3204                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3205
3206                 # if there are fewer than 4 headlines in the article, do not show TOC
3207                 # unless it's been explicitly enabled.
3208                 $enoughToc = $this->mShowToc &&
3209                         (($numMatches >= 4) || $this->mForceTocPosition);
3210
3211                 # Allow user to stipulate that a page should have a "new section"
3212                 # link added via __NEWSECTIONLINK__
3213                 $mw =& MagicWord::get( MAG_NEWSECTIONLINK );
3214                 if( $mw->matchAndRemove( $text ) )
3215                         $this->mOutput->setNewSection( true );
3216
3217                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3218                 # override above conditions and always show TOC above first header
3219                 $mw =& MagicWord::get( MAG_FORCETOC );
3220                 if ($mw->matchAndRemove( $text ) ) {
3221                         $this->mShowToc = true;
3222                         $enoughToc = true;
3223                 }
3224
3225                 # Never ever show TOC if no headers
3226                 if( $numMatches < 1 ) {
3227                         $enoughToc = false;
3228                 }
3229
3230                 # We need this to perform operations on the HTML
3231                 $sk =& $this->mOptions->getSkin();
3232
3233                 # headline counter
3234                 $headlineCount = 0;
3235                 $sectionCount = 0; # headlineCount excluding template sections
3236
3237                 # Ugh .. the TOC should have neat indentation levels which can be
3238                 # passed to the skin functions. These are determined here
3239                 $toc = '';
3240                 $full = '';
3241                 $head = array();
3242                 $sublevelCount = array();
3243                 $levelCount = array();
3244                 $toclevel = 0;
3245                 $level = 0;
3246                 $prevlevel = 0;
3247                 $toclevel = 0;
3248                 $prevtoclevel = 0;
3249
3250                 foreach( $matches[3] as $headline ) {
3251                         $istemplate = 0;
3252                         $templatetitle = '';
3253                         $templatesection = 0;
3254                         $numbering = '';
3255
3256                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3257                                 $istemplate = 1;
3258                                 $templatetitle = base64_decode($mat[1]);
3259                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3260                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3261                         }
3262
3263                         if( $toclevel ) {
3264                                 $prevlevel = $level;
3265                                 $prevtoclevel = $toclevel;
3266                         }
3267                         $level = $matches[1][$headlineCount];
3268
3269                         if( $doNumberHeadings || $enoughToc ) {
3270
3271                                 if ( $level > $prevlevel ) {
3272                                         # Increase TOC level
3273                                         $toclevel++;
3274                                         $sublevelCount[$toclevel] = 0;
3275                                         if( $toclevel<$wgMaxTocLevel ) {
3276                                                 $toc .= $sk->tocIndent();
3277                                         }
3278                                 }
3279                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3280                                         # Decrease TOC level, find level to jump to
3281
3282                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3283                                                 # Can only go down to level 1
3284                                                 $toclevel = 1;
3285                                         } else {
3286                                                 for ($i = $toclevel; $i > 0; $i--) {
3287                                                         if ( $levelCount[$i] == $level ) {
3288                                                                 # Found last matching level
3289                                                                 $toclevel = $i;
3290                                                                 break;
3291                                                         }
3292                                                         elseif ( $levelCount[$i] < $level ) {
3293                                                                 # Found first matching level below current level
3294                                                                 $toclevel = $i + 1;
3295                                                                 break;
3296                                                         }
3297                                                 }
3298                                         }
3299                                         if( $toclevel<$wgMaxTocLevel ) {
3300                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3301                                         }
3302                                 }
3303                                 else {
3304                                         # No change in level, end TOC line
3305                                         if( $toclevel<$wgMaxTocLevel ) {
3306                                                 $toc .= $sk->tocLineEnd();
3307                                         }
3308                                 }
3309
3310                                 $levelCount[$toclevel] = $level;
3311
3312                                 # count number of headlines for each level
3313                                 @$sublevelCount[$toclevel]++;
3314                                 $dot = 0;
3315                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3316                                         if( !empty( $sublevelCount[$i] ) ) {
3317                                                 if( $dot ) {
3318                                                         $numbering .= '.';
3319                                                 }
3320                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3321                                                 $dot = 1;
3322                                         }
3323                                 }
3324                         }
3325
3326                         # The canonized header is a version of the header text safe to use for links
3327                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3328                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3329                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3330
3331                         # Remove link placeholders by the link text.
3332                         #     <!--LINK number-->
3333                         # turns into
3334                         #     link text with suffix
3335                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3336                                                             "\$this->mLinkHolders['texts'][\$1]",
3337                                                             $canonized_headline );
3338                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3339                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3340                                                             $canonized_headline );
3341
3342                         # strip out HTML
3343                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3344                         $tocline = trim( $canonized_headline );
3345                         # Save headline for section edit hint before it's escaped
3346                         $headline_hint = trim( $canonized_headline );
3347                         $canonized_headline = Sanitizer::escapeId( $tocline );
3348                         $refers[$headlineCount] = $canonized_headline;
3349
3350                         # count how many in assoc. array so we can track dupes in anchors
3351                         @$refers[$canonized_headline]++;
3352                         $refcount[$headlineCount]=$refers[$canonized_headline];
3353
3354                         # Don't number the heading if it is the only one (looks silly)
3355                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3356                                 # the two are different if the line contains a link
3357                                 $headline=$numbering . ' ' . $headline;
3358                         }
3359
3360                         # Create the anchor for linking from the TOC to the section
3361                         $anchor = $canonized_headline;
3362                         if($refcount[$headlineCount] > 1 ) {
3363                                 $anchor .= '_' . $refcount[$headlineCount];
3364                         }
3365                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3366                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3367                         }
3368                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3369                                 if ( empty( $head[$headlineCount] ) ) {
3370                                         $head[$headlineCount] = '';
3371                                 }
3372                                 if( $istemplate )
3373                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3374                                 else
3375                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3376                         }
3377
3378                         # give headline the correct <h#> tag
3379                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3380
3381                         $headlineCount++;
3382                         if( !$istemplate )
3383                                 $sectionCount++;
3384                 }
3385
3386                 if( $enoughToc ) {
3387                         if( $toclevel<$wgMaxTocLevel ) {
3388                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3389                         }
3390                         $toc = $sk->tocList( $toc );
3391                 }
3392
3393                 # split up and insert constructed headlines
3394
3395                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3396                 $i = 0;
3397
3398                 foreach( $blocks as $block ) {
3399                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3400                                 # This is the [edit] link that appears for the top block of text when
3401                                 # section editing is enabled
3402
3403                                 # Disabled because it broke block formatting
3404                                 # For example, a bullet point in the top line
3405                                 # $full .= $sk->editSectionLink(0);
3406                         }
3407                         $full .= $block;
3408                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3409                                 # Top anchor now in skin
3410                                 $full = $full.$toc;
3411                         }
3412
3413                         if( !empty( $head[$i] ) ) {
3414                                 $full .= $head[$i];
3415                         }
3416                         $i++;
3417                 }
3418                 if( $this->mForceTocPosition ) {
3419                         return str_replace( '<!--MWTOC-->', $toc, $full );
3420                 } else {
3421                         return $full;
3422                 }
3423         }
3424
3425         /**
3426          * Return an HTML link for the "ISBN 123456" text
3427          * @private
3428          */
3429         function magicISBN( $text ) {
3430                 $fname = 'Parser::magicISBN';
3431                 wfProfileIn( $fname );
3432
3433                 $a = split( 'ISBN ', ' '.$text );
3434                 if ( count ( $a ) < 2 ) {
3435                         wfProfileOut( $fname );
3436                         return $text;
3437                 }
3438                 $text = substr( array_shift( $a ), 1);
3439                 $valid = '0123456789-Xx';
3440
3441                 foreach ( $a as $x ) {
3442                         # hack: don't replace inside thumbnail title/alt
3443                         # attributes
3444                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3445                                 $text .= "ISBN $x";
3446                                 continue;
3447                         }
3448
3449                         $isbn = $blank = '' ;
3450                         while ( ' ' == $x{0} ) {
3451                                 $blank .= ' ';
3452                                 $x = substr( $x, 1 );
3453                         }
3454                         if ( $x == '' ) { # blank isbn
3455                                 $text .= "ISBN $blank";
3456                                 continue;
3457                         }
3458                         while ( strstr( $valid, $x{0} ) != false ) {
3459                                 $isbn .= $x{0};
3460                                 $x = substr( $x, 1 );
3461                         }
3462                         $num = str_replace( '-', '', $isbn );
3463                         $num = str_replace( ' ', '', $num );
3464                         $num = str_replace( 'x', 'X', $num );
3465
3466                         if ( '' == $num ) {
3467                                 $text .= "ISBN $blank$x";
3468                         } else {
3469                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3470                                 $text .= '<a href="' .
3471                                         $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3472                                         "\" class=\"internal\">ISBN $isbn</a>";
3473                                 $text .= $x;
3474                         }
3475                 }
3476                 wfProfileOut( $fname );
3477                 return $text;
3478         }
3479
3480         /**
3481          * Return an HTML link for the "RFC 1234" text
3482          *
3483          * @private
3484          * @param string $text     Text to be processed
3485          * @param string $keyword  Magic keyword to use (default RFC)
3486          * @param string $urlmsg   Interface message to use (default rfcurl)
3487          * @return string
3488          */
3489         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3490
3491                 $valid = '0123456789';
3492                 $internal = false;
3493
3494                 $a = split( $keyword, ' '.$text );
3495                 if ( count ( $a ) < 2 ) {
3496                         return $text;
3497                 }
3498                 $text = substr( array_shift( $a ), 1);
3499
3500                 /* Check if keyword is preceed by [[.
3501                  * This test is made here cause of the array_shift above
3502                  * that prevent the test to be done in the foreach.
3503                  */
3504                 if ( substr( $text, -2 ) == '[[' ) {
3505                         $internal = true;
3506                 }
3507
3508                 foreach ( $a as $x ) {
3509                         /* token might be empty if we have RFC RFC 1234 */
3510                         if ( $x=='' ) {
3511                                 $text.=$keyword;
3512                                 continue;
3513                                 }
3514
3515                         # hack: don't replace inside thumbnail title/alt
3516                         # attributes
3517                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3518                                 $text .= $keyword . $x;
3519                                 continue;
3520                         }
3521
3522                         $id = $blank = '' ;
3523
3524                         /** remove and save whitespaces in $blank */
3525                         while ( $x{0} == ' ' ) {
3526                                 $blank .= ' ';
3527                                 $x = substr( $x, 1 );
3528                         }
3529
3530                         /** remove and save the rfc number in $id */
3531                         while ( strstr( $valid, $x{0} ) != false ) {
3532                                 $id .= $x{0};
3533                                 $x = substr( $x, 1 );
3534                         }
3535
3536                         if ( $id == '' ) {
3537                                 /* call back stripped spaces*/
3538                                 $text .= $keyword.$blank.$x;
3539                         } elseif( $internal ) {
3540                                 /* normal link */
3541                                 $text .= $keyword.$id.$x;
3542                         } else {
3543                                 /* build the external link*/
3544                                 $url = wfMsg( $urlmsg, $id);
3545                                 $sk =& $this->mOptions->getSkin();
3546                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3547                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3548                         }
3549
3550                         /* Check if the next RFC keyword is preceed by [[ */
3551                         $internal = ( substr($x,-2) == '[[' );
3552                 }
3553                 return $text;
3554         }
3555
3556         /**
3557          * Transform wiki markup when saving a page by doing \r\n -> \n
3558          * conversion, substitting signatures, {{subst:}} templates, etc.
3559          *
3560          * @param string $text the text to transform
3561          * @param Title &$title the Title object for the current article
3562          * @param User &$user the User object describing the current user
3563          * @param ParserOptions $options parsing options
3564          * @param bool $clearState whether to clear the parser state first
3565          * @return string the altered wiki markup
3566          * @public
3567          */
3568         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3569                 $this->mOptions = $options;
3570                 $this->mTitle =& $title;
3571                 $this->mOutputType = OT_WIKI;
3572
3573                 if ( $clearState ) {
3574                         $this->clearState();
3575                 }
3576
3577                 $stripState = false;
3578                 $pairs = array(
3579                         "\r\n" => "\n",
3580                 );
3581                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3582                 $text = $this->strip( $text, $stripState, true );
3583                 $text = $this->pstPass2( $text, $stripState, $user );
3584                 $text = $this->unstrip( $text, $stripState );
3585                 $text = $this->unstripNoWiki( $text, $stripState );
3586                 return $text;
3587         }
3588
3589         /**
3590          * Pre-save transform helper function
3591          * @private
3592          */
3593         function pstPass2( $text, &$stripState, &$user ) {
3594                 global $wgContLang, $wgLocaltimezone;
3595
3596                 /* Note: This is the timestamp saved as hardcoded wikitext to
3597                  * the database, we use $wgContLang here in order to give
3598                  * everyone the same signature and use the default one rather
3599                  * than the one selected in each user's preferences.
3600                  */
3601                 if ( isset( $wgLocaltimezone ) ) {
3602                         $oldtz = getenv( 'TZ' );
3603                         putenv( 'TZ='.$wgLocaltimezone );
3604                 }
3605                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3606                   ' (' . date( 'T' ) . ')';
3607                 if ( isset( $wgLocaltimezone ) ) {
3608                         putenv( 'TZ='.$oldtz );
3609                 }
3610
3611                 # Variable replacement
3612                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3613                 $text = $this->replaceVariables( $text );
3614
3615                 # Strip out <nowiki> etc. added via replaceVariables
3616                 $text = $this->strip( $text, $stripState );
3617
3618                 # Signatures
3619                 $sigText = $this->getUserSig( $user );
3620                 $text = strtr( $text, array(
3621                         '~~~~~' => $d,
3622                         '~~~~' => "$sigText $d",
3623                         '~~~' => $sigText
3624                 ) );
3625
3626                 # Context links: [[|name]] and [[name (context)|]]
3627                 #
3628                 global $wgLegalTitleChars;
3629                 $tc = "[$wgLegalTitleChars]";
3630                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3631
3632                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3633                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3634
3635                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3636                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3637                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3638                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3639                 $context = '';
3640                 $t = $this->mTitle->getText();
3641                 if ( preg_match( $conpat, $t, $m ) ) {
3642                         $context = $m[2];
3643                 }
3644                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3645                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3646                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3647
3648                 if ( '' == $context ) {
3649                         $text = preg_replace( $p2, '[[\\1]]', $text );
3650                 } else {
3651                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3652                 }
3653
3654                 # Trim trailing whitespace
3655                 # MAG_END (__END__) tag allows for trailing
3656                 # whitespace to be deliberately included
3657                 $text = rtrim( $text );
3658                 $mw =& MagicWord::get( MAG_END );
3659                 $mw->matchAndRemove( $text );
3660
3661                 return $text;
3662         }
3663
3664         /**
3665          * Fetch the user's signature text, if any, and normalize to
3666          * validated, ready-to-insert wikitext.
3667          *
3668          * @param User $user
3669          * @return string
3670          * @private
3671          */
3672         function getUserSig( &$user ) {
3673                 $username = $user->getName();
3674                 $nickname = $user->getOption( 'nickname' );
3675                 $nickname = $nickname === '' ? $username : $nickname;
3676
3677                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3678                         # Sig. might contain markup; validate this
3679                         if( $this->validateSig( $nickname ) !== false ) {
3680                                 # Validated; clean up (if needed) and return it
3681                                 return $this->cleanSig( $nickname, true );
3682                         } else {
3683                                 # Failed to validate; fall back to the default
3684                                 $nickname = $username;
3685                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3686                         }
3687                 }
3688
3689                 # If we're still here, make it a link to the user page
3690                 $userpage = $user->getUserPage();
3691                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3692         }
3693
3694         /**
3695          * Check that the user's signature contains no bad XML
3696          *
3697          * @param string $text
3698          * @return mixed An expanded string, or false if invalid.
3699          */
3700         function validateSig( $text ) {
3701                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3702         }
3703
3704         /**
3705          * Clean up signature text
3706          *
3707          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3708          * 2) Substitute all transclusions
3709          *
3710          * @param string $text
3711          * @param $parsing Whether we're cleaning (preferences save) or parsing
3712          * @return string Signature text
3713          */
3714         function cleanSig( $text, $parsing = false ) {
3715                 global $wgTitle;
3716                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3717
3718                 $substWord = MagicWord::get( MAG_SUBST );
3719                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3720                 $substText = '{{' . $substWord->getSynonym( 0 );
3721
3722                 $text = preg_replace( $substRegex, $substText, $text );
3723                 $text = preg_replace( '/~{3,5}/', '', $text );
3724                 $text = $this->replaceVariables( $text );
3725
3726                 $this->clearState();
3727                 return $text;
3728         }
3729
3730         /**
3731          * Set up some variables which are usually set up in parse()
3732          * so that an external function can call some class members with confidence
3733          * @public
3734          */
3735         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3736                 $this->mTitle =& $title;
3737                 $this->mOptions = $options;
3738                 $this->mOutputType = $outputType;
3739                 if ( $clearState ) {
3740                         $this->clearState();
3741                 }
3742         }
3743
3744         /**
3745          * Transform a MediaWiki message by replacing magic variables.
3746          *
3747          * @param string $text the text to transform
3748          * @param ParserOptions $options  options
3749          * @return string the text with variables substituted
3750          * @public
3751          */
3752         function transformMsg( $text, $options ) {
3753                 global $wgTitle;
3754                 static $executing = false;
3755
3756                 $fname = "Parser::transformMsg";
3757
3758                 # Guard against infinite recursion
3759                 if ( $executing ) {
3760                         return $text;
3761                 }
3762                 $executing = true;
3763
3764                 wfProfileIn($fname);
3765
3766                 $this->mTitle = $wgTitle;
3767                 $this->mOptions = $options;
3768                 $this->mOutputType = OT_MSG;
3769                 $this->clearState();
3770                 $text = $this->replaceVariables( $text );
3771
3772                 $executing = false;
3773                 wfProfileOut($fname);
3774                 return $text;
3775         }
3776
3777         /**
3778          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3779          * The callback should have the following form:
3780          *    function myParserHook( $text, $params, &$parser ) { ... }
3781          *
3782          * Transform and return $text. Use $parser for any required context, e.g. use
3783          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3784          *
3785          * @public
3786          *
3787          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3788          * @param mixed $callback The callback function (and object) to use for the tag
3789          *
3790          * @return The old value of the mTagHooks array associated with the hook
3791          */
3792         function setHook( $tag, $callback ) {
3793                 $tag = strtolower( $tag );
3794                 $oldVal = @$this->mTagHooks[$tag];
3795                 $this->mTagHooks[$tag] = $callback;
3796
3797                 return $oldVal;
3798         }
3799
3800         /**
3801          * Create a function, e.g. {{sum:1|2|3}}
3802          * The callback function should have the form:
3803          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3804          *
3805          * The callback may either return the text result of the function, or an array with the text
3806          * in element 0, and a number of flags in the other elements. The names of the flags are
3807          * specified in the keys. Valid flags are:
3808          *   found                     The text returned is valid, stop processing the template. This
3809          *                             is on by default.
3810          *   nowiki                    Wiki markup in the return value should be escaped
3811          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3812          *   noargs                    Don't replace triple-brace arguments in the return value
3813          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3814          *
3815          * @public
3816          *
3817          * @param string $name The function name. Function names are case-insensitive.
3818          * @param mixed $callback The callback function (and object) to use
3819          *
3820          * @return The old callback function for this name, if any
3821          */
3822         function setFunctionHook( $name, $callback ) {
3823                 $name = strtolower( $name );
3824                 $oldVal = @$this->mFunctionHooks[$name];
3825                 $this->mFunctionHooks[$name] = $callback;
3826                 return $oldVal;
3827         }
3828
3829         /**
3830          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3831          * Placeholders created in Skin::makeLinkObj()
3832          * Returns an array of links found, indexed by PDBK:
3833          *  0 - broken
3834          *  1 - normal link
3835          *  2 - stub
3836          * $options is a bit field, RLH_FOR_UPDATE to select for update
3837          */
3838         function replaceLinkHolders( &$text, $options = 0 ) {
3839                 global $wgUser;
3840                 global $wgOutputReplace;
3841
3842                 $fname = 'Parser::replaceLinkHolders';
3843                 wfProfileIn( $fname );
3844
3845                 $pdbks = array();
3846                 $colours = array();
3847                 $sk =& $this->mOptions->getSkin();
3848                 $linkCache =& LinkCache::singleton();
3849
3850                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3851                         wfProfileIn( $fname.'-check' );
3852                         $dbr =& wfGetDB( DB_SLAVE );
3853                         $page = $dbr->tableName( 'page' );
3854                         $threshold = $wgUser->getOption('stubthreshold');
3855
3856                         # Sort by namespace
3857                         asort( $this->mLinkHolders['namespaces'] );
3858
3859                         # Generate query
3860                         $query = false;
3861                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3862                                 # Make title object
3863                                 $title = $this->mLinkHolders['titles'][$key];
3864
3865                                 # Skip invalid entries.
3866                                 # Result will be ugly, but prevents crash.
3867                                 if ( is_null( $title ) ) {
3868                                         continue;
3869                                 }
3870                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3871
3872                                 # Check if it's a static known link, e.g. interwiki
3873                                 if ( $title->isAlwaysKnown() ) {
3874                                         $colours[$pdbk] = 1;
3875                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3876                                         $colours[$pdbk] = 1;
3877                                         $this->mOutput->addLink( $title, $id );
3878                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3879                                         $colours[$pdbk] = 0;
3880                                 } else {
3881                                         # Not in the link cache, add it to the query
3882                                         if ( !isset( $current ) ) {
3883                                                 $current = $ns;
3884                                                 $query =  "SELECT page_id, page_namespace, page_title";
3885                                                 if ( $threshold > 0 ) {
3886                                                         $query .= ', page_len, page_is_redirect';
3887                                                 }
3888                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3889                                         } elseif ( $current != $ns ) {
3890                                                 $current = $ns;
3891                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3892                                         } else {
3893                                                 $query .= ', ';
3894                                         }
3895
3896                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3897                                 }
3898                         }
3899                         if ( $query ) {
3900                                 $query .= '))';
3901                                 if ( $options & RLH_FOR_UPDATE ) {
3902                                         $query .= ' FOR UPDATE';
3903                                 }
3904
3905                                 $res = $dbr->query( $query, $fname );
3906
3907                                 # Fetch data and form into an associative array
3908                                 # non-existent = broken
3909                                 # 1 = known
3910                                 # 2 = stub
3911                                 while ( $s = $dbr->fetchObject($res) ) {
3912                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3913                                         $pdbk = $title->getPrefixedDBkey();
3914                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3915                                         $this->mOutput->addLink( $title, $s->page_id );
3916
3917                                         if ( $threshold >  0 ) {
3918                                                 $size = $s->page_len;
3919                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3920                                                         $colours[$pdbk] = 1;
3921                                                 } else {
3922                                                         $colours[$pdbk] = 2;
3923                                                 }
3924                                         } else {
3925                                                 $colours[$pdbk] = 1;
3926                                         }
3927                                 }
3928                         }
3929                         wfProfileOut( $fname.'-check' );
3930
3931                         # Construct search and replace arrays
3932                         wfProfileIn( $fname.'-construct' );
3933                         $wgOutputReplace = array();
3934                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3935                                 $pdbk = $pdbks[$key];
3936                                 $searchkey = "<!--LINK $key-->";
3937                                 $title = $this->mLinkHolders['titles'][$key];
3938                                 if ( empty( $colours[$pdbk] ) ) {
3939                                         $linkCache->addBadLinkObj( $title );
3940                                         $colours[$pdbk] = 0;
3941                                         $this->mOutput->addLink( $title, 0 );
3942                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3943                                                                         $this->mLinkHolders['texts'][$key],
3944                                                                         $this->mLinkHolders['queries'][$key] );
3945                                 } elseif ( $colours[$pdbk] == 1 ) {
3946                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3947                                                                         $this->mLinkHolders['texts'][$key],
3948                                                                         $this->mLinkHolders['queries'][$key] );
3949                                 } elseif ( $colours[$pdbk] == 2 ) {
3950                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3951                                                                         $this->mLinkHolders['texts'][$key],
3952                                                                         $this->mLinkHolders['queries'][$key] );
3953                                 }
3954                         }
3955                         wfProfileOut( $fname.'-construct' );
3956
3957                         # Do the thing
3958                         wfProfileIn( $fname.'-replace' );
3959
3960                         $text = preg_replace_callback(
3961                                 '/(<!--LINK .*?-->)/',
3962                                 "wfOutputReplaceMatches",
3963                                 $text);
3964
3965                         wfProfileOut( $fname.'-replace' );
3966                 }
3967
3968                 # Now process interwiki link holders
3969                 # This is quite a bit simpler than internal links
3970                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3971                         wfProfileIn( $fname.'-interwiki' );
3972                         # Make interwiki link HTML
3973                         $wgOutputReplace = array();
3974                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3975                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3976                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3977                         }
3978
3979                         $text = preg_replace_callback(
3980                                 '/<!--IWLINK (.*?)-->/',
3981                                 "wfOutputReplaceMatches",
3982                                 $text );
3983                         wfProfileOut( $fname.'-interwiki' );
3984                 }
3985
3986                 wfProfileOut( $fname );
3987                 return $colours;
3988         }
3989
3990         /**
3991          * Replace <!--LINK--> link placeholders with plain text of links
3992          * (not HTML-formatted).
3993          * @param string $text
3994          * @return string
3995          */
3996         function replaceLinkHoldersText( $text ) {
3997                 $fname = 'Parser::replaceLinkHoldersText';
3998                 wfProfileIn( $fname );
3999
4000                 $text = preg_replace_callback(
4001                         '/<!--(LINK|IWLINK) (.*?)-->/',
4002                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4003                         $text );
4004
4005                 wfProfileOut( $fname );
4006                 return $text;
4007         }
4008
4009         /**
4010          * @param array $matches
4011          * @return string
4012          * @private
4013          */
4014         function replaceLinkHoldersTextCallback( $matches ) {
4015                 $type = $matches[1];
4016                 $key  = $matches[2];
4017                 if( $type == 'LINK' ) {
4018                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4019                                 return $this->mLinkHolders['texts'][$key];
4020                         }
4021                 } elseif( $type == 'IWLINK' ) {
4022                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4023                                 return $this->mInterwikiLinkHolders['texts'][$key];
4024                         }
4025                 }
4026                 return $matches[0];
4027         }
4028
4029         /**
4030          * Tag hook handler for 'pre'.
4031          */
4032         function renderPreTag( $text, $attribs, $parser ) {
4033                 // Backwards-compatibility hack
4034                 $content = preg_replace( '!<nowiki>(.*?)</nowiki>!is', '\\1', $text );
4035
4036                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4037                 return wfOpenElement( 'pre', $attribs ) .
4038                         wfEscapeHTMLTagsOnly( $content ) .
4039                         '</pre>';
4040         }
4041
4042         /**
4043          * Renders an image gallery from a text with one line per image.
4044          * text labels may be given by using |-style alternative text. E.g.
4045          *   Image:one.jpg|The number "1"
4046          *   Image:tree.jpg|A tree
4047          * given as text will return the HTML of a gallery with two images,
4048          * labeled 'The number "1"' and
4049          * 'A tree'.
4050          */
4051         function renderImageGallery( $text ) {
4052                 $ig = new ImageGallery();
4053                 $ig->setShowBytes( false );
4054                 $ig->setShowFilename( false );
4055                 $ig->setParsing();
4056                 $lines = explode( "\n", $text );
4057
4058                 foreach ( $lines as $line ) {
4059                         # match lines like these:
4060                         # Image:someimage.jpg|This is some image
4061                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4062                         # Skip empty lines
4063                         if ( count( $matches ) == 0 ) {
4064                                 continue;
4065                         }
4066                         $nt =& Title::newFromText( $matches[1] );
4067                         if( is_null( $nt ) ) {
4068                                 # Bogus title. Ignore these so we don't bomb out later.
4069                                 continue;
4070                         }
4071                         if ( isset( $matches[3] ) ) {
4072                                 $label = $matches[3];
4073                         } else {
4074                                 $label = '';
4075                         }
4076
4077                         $pout = $this->parse( $label,
4078                                 $this->mTitle,
4079                                 $this->mOptions,
4080                                 false, // Strip whitespace...?
4081                                 false  // Don't clear state!
4082                         );
4083                         $html = $pout->getText();
4084
4085                         $ig->add( new Image( $nt ), $html );
4086
4087                         # Only add real images (bug #5586)
4088                         if ( $nt->getNamespace() == NS_IMAGE ) {
4089                                 $this->mOutput->addImage( $nt->getDBkey() );
4090                         }
4091                 }
4092                 return $ig->toHTML();
4093         }
4094
4095         /**
4096          * Parse image options text and use it to make an image
4097          */
4098         function makeImage( &$nt, $options ) {
4099                 global $wgUseImageResize;
4100
4101                 $align = '';
4102
4103                 # Check if the options text is of the form "options|alt text"
4104                 # Options are:
4105                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4106                 #  * left               no resizing, just left align. label is used for alt= only
4107                 #  * right              same, but right aligned
4108                 #  * none               same, but not aligned
4109                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4110                 #  * center             center the image
4111                 #  * framed             Keep original image size, no magnify-button.
4112
4113                 $part = explode( '|', $options);
4114
4115                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
4116                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
4117                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
4118                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
4119                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
4120                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
4121                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
4122                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
4123                 $caption = '';
4124
4125                 $width = $height = $framed = $thumb = false;
4126                 $manual_thumb = '' ;
4127
4128                 foreach( $part as $key => $val ) {
4129                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4130                                 $thumb=true;
4131                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4132                                 # use manually specified thumbnail
4133                                 $thumb=true;
4134                                 $manual_thumb = $match;
4135                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
4136                                 # remember to set an alignment, don't render immediately
4137                                 $align = 'right';
4138                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
4139                                 # remember to set an alignment, don't render immediately
4140                                 $align = 'left';
4141                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
4142                                 # remember to set an alignment, don't render immediately
4143                                 $align = 'center';
4144                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
4145                                 # remember to set an alignment, don't render immediately
4146                                 $align = 'none';
4147                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4148                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
4149                                 # $match is the image width in pixels
4150                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4151                                         $width = intval( $m[1] );
4152                                         $height = intval( $m[2] );
4153                                 } else {
4154                                         $width = intval($match);
4155                                 }
4156                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4157                                 $framed=true;
4158                         } else {
4159                                 $caption = $val;
4160                         }
4161                 }
4162                 # Strip bad stuff out of the alt text
4163                 $alt = $this->replaceLinkHoldersText( $caption );
4164
4165                 # make sure there are no placeholders in thumbnail attributes
4166                 # that are later expanded to html- so expand them now and
4167                 # remove the tags
4168                 $alt = $this->unstrip($alt, $this->mStripState);
4169                 $alt = Sanitizer::stripAllTags( $alt );
4170
4171                 # Linker does the rest
4172                 $sk =& $this->mOptions->getSkin();
4173                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
4174         }
4175
4176         /**
4177          * Set a flag in the output object indicating that the content is dynamic and
4178          * shouldn't be cached.
4179          */
4180         function disableCache() {
4181                 wfDebug( "Parser output marked as uncacheable.\n" );
4182                 $this->mOutput->mCacheTime = -1;
4183         }
4184
4185         /**#@+
4186          * Callback from the Sanitizer for expanding items found in HTML attribute
4187          * values, so they can be safely tested and escaped.
4188          * @param string $text
4189          * @param array $args
4190          * @return string
4191          * @private
4192          */
4193         function attributeStripCallback( &$text, $args ) {
4194                 $text = $this->replaceVariables( $text, $args );
4195                 $text = $this->unstripForHTML( $text );
4196                 return $text;
4197         }
4198
4199         function unstripForHTML( $text ) {
4200                 $text = $this->unstrip( $text, $this->mStripState );
4201                 $text = $this->unstripNoWiki( $text, $this->mStripState );
4202                 return $text;
4203         }
4204         /**#@-*/
4205
4206         /**#@+
4207          * Accessor/mutator
4208          */
4209         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4210         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4211         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4212         /**#@-*/
4213
4214         /**#@+
4215          * Accessor
4216          */
4217         function getTags() { return array_keys( $this->mTagHooks ); }
4218         /**#@-*/
4219
4220
4221         /**
4222          * Break wikitext input into sections, and either pull or replace
4223          * some particular section's text.
4224          *
4225          * External callers should use the getSection and replaceSection methods.
4226          *
4227          * @param $text Page wikitext
4228          * @param $section Numbered section. 0 pulls the text before the first
4229          *                 heading; other numbers will pull the given section
4230          *                 along with its lower-level subsections.
4231          * @param $mode One of "get" or "replace"
4232          * @param $newtext Replacement text for section data.
4233          * @return string for "get", the extracted section text.
4234          *                for "replace", the whole page with the section replaced.
4235          */
4236         private function extractSections( $text, $section, $mode, $newtext='' ) {
4237                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4238                 # comments to be stripped as well)
4239                 $striparray = array();
4240
4241                 $oldOutputType = $this->mOutputType;
4242                 $oldOptions = $this->mOptions;
4243                 $this->mOptions = new ParserOptions();
4244                 $this->mOutputType = OT_WIKI;
4245
4246                 $striptext = $this->strip( $text, $striparray, true );
4247
4248                 $this->mOutputType = $oldOutputType;
4249                 $this->mOptions = $oldOptions;
4250
4251                 # now that we can be sure that no pseudo-sections are in the source,
4252                 # split it up by section
4253                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4254                 $comment = "(?:$uniq-!--.*?QINU)";
4255                 $secs = preg_split(
4256                 /*
4257                         "/
4258                         ^(
4259                         (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4260                         (?:
4261                                 (=+) # Should this be limited to 6?
4262                                 .+?  # Section title...
4263                                 \\2  # Ending = count must match start
4264                         |
4265                                 ^
4266                                 <h([1-6])\b.*?>
4267                                 .*?
4268                                 <\/h\\3\s*>
4269                         )
4270                         (?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
4271                         )$
4272                         /mix",
4273                 */
4274                         "/
4275                         (
4276                                 ^
4277                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4278                                 (=+) # Should this be limited to 6?
4279                                 .+?  # Section title...
4280                                 \\2  # Ending = count must match start
4281                                 (?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
4282                                 $
4283                         |
4284                                 <h([1-6])\b.*?>
4285                                 .*?
4286                                 <\/h\\3\s*>
4287                         )
4288                         /mix",
4289                         $striptext, -1,
4290                         PREG_SPLIT_DELIM_CAPTURE);
4291
4292                 if( $mode == "get" ) {
4293                         if( $section == 0 ) {
4294                                 // "Section 0" returns the content before any other section.
4295                                 $rv = $secs[0];
4296                         } else {
4297                                 $rv = "";
4298                         }
4299                 } elseif( $mode == "replace" ) {
4300                         if( $section == 0 ) {
4301                                 $rv = $newtext . "\n\n";
4302                                 $remainder = true;
4303                         } else {
4304                                 $rv = $secs[0];
4305                                 $remainder = false;
4306                         }
4307                 }
4308                 $count = 0;
4309                 $sectionLevel = 0;
4310                 for( $index = 1; $index < count( $secs ); ) {
4311                         $headerLine = $secs[$index++];
4312                         if( $secs[$index] ) {
4313                                 // A wiki header
4314                                 $headerLevel = strlen( $secs[$index++] );
4315                         } else {
4316                                 // An HTML header
4317                                 $index++;
4318                                 $headerLevel = intval( $secs[$index++] );
4319                         }
4320                         $content = $secs[$index++];
4321
4322                         $count++;
4323                         if( $mode == "get" ) {
4324                                 if( $count == $section ) {
4325                                         $rv = $headerLine . $content;
4326                                         $sectionLevel = $headerLevel;
4327                                 } elseif( $count > $section ) {
4328                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4329                                                 $rv .= $headerLine . $content;
4330                                         } else {
4331                                                 // Broke out to a higher-level section
4332                                                 break;
4333                                         }
4334                                 }
4335                         } elseif( $mode == "replace" ) {
4336                                 if( $count < $section ) {
4337                                         $rv .= $headerLine . $content;
4338                                 } elseif( $count == $section ) {
4339                                         $rv .= $newtext . "\n\n";
4340                                         $sectionLevel = $headerLevel;
4341                                 } elseif( $count > $section ) {
4342                                         if( $headerLevel <= $sectionLevel ) {
4343                                                 // Passed the section's sub-parts.
4344                                                 $remainder = true;
4345                                         }
4346                                         if( $remainder ) {
4347                                                 $rv .= $headerLine . $content;
4348                                         }
4349                                 }
4350                         }
4351                 }
4352                 # reinsert stripped tags
4353                 $rv = $this->unstrip( $rv, $striparray );
4354                 $rv = $this->unstripNoWiki( $rv, $striparray );
4355                 $rv = trim( $rv );
4356                 return $rv;
4357         }
4358
4359         /**
4360          * This function returns the text of a section, specified by a number ($section).
4361          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4362          * the first section before any such heading (section 0).
4363          *
4364          * If a section contains subsections, these are also returned.
4365          *
4366          * @param $text String: text to look in
4367          * @param $section Integer: section number
4368          * @return string text of the requested section
4369          */
4370         function getSection( $text, $section ) {
4371                 return $this->extractSections( $text, $section, "get" );
4372         }
4373
4374         function replaceSection( $oldtext, $section, $text ) {
4375                 return $this->extractSections( $oldtext, $section, "replace", $text );
4376         }
4377
4378 }
4379
4380 /**
4381  * @todo document
4382  * @package MediaWiki
4383  */
4384 class ParserOutput
4385 {
4386         var $mText,             # The output text
4387                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4388                 $mCategories,       # Map of category names to sort keys
4389                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4390                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4391                 $mVersion,          # Compatibility check
4392                 $mTitleText,        # title text of the chosen language variant
4393                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4394                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4395                 $mImages,           # DB keys of the images used, in the array key only
4396                 $mExternalLinks,    # External link URLs, in the key only
4397                 $mHTMLtitle,            # Display HTML title
4398                 $mSubtitle,                     # Additional subtitle
4399                 $mNewSection;           # Show a new section link?
4400
4401         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4402                 $containsOldMagic = false, $titletext = '' )
4403         {
4404                 $this->mText = $text;
4405                 $this->mLanguageLinks = $languageLinks;
4406                 $this->mCategories = $categoryLinks;
4407                 $this->mContainsOldMagic = $containsOldMagic;
4408                 $this->mCacheTime = '';
4409                 $this->mVersion = MW_PARSER_VERSION;
4410                 $this->mTitleText = $titletext;
4411                 $this->mLinks = array();
4412                 $this->mTemplates = array();
4413                 $this->mImages = array();
4414                 $this->mExternalLinks = array();
4415                 $this->mHTMLtitle = "" ;
4416                 $this->mSubtitle = "" ;
4417                 $this->mNewSection = false;
4418         }
4419
4420         function getText()                   { return $this->mText; }
4421         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4422         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4423         function &getCategories()            { return $this->mCategories; }
4424         function getCacheTime()              { return $this->mCacheTime; }
4425         function getTitleText()              { return $this->mTitleText; }
4426         function &getLinks()                 { return $this->mLinks; }
4427         function &getTemplates()             { return $this->mTemplates; }
4428         function &getImages()                { return $this->mImages; }
4429         function &getExternalLinks()         { return $this->mExternalLinks; }
4430
4431         function containsOldMagic()          { return $this->mContainsOldMagic; }
4432         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4433         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4434         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4435         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4436         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4437         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
4438
4439         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4440         function addImage( $name )           { $this->mImages[$name] = 1; }
4441         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4442         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4443
4444         function setNewSection( $value ) {
4445                 $this->mNewSection = (bool)$value;
4446         }
4447         function getNewSection() {
4448                 return (bool)$this->mNewSection;
4449         }
4450
4451         function addLink( $title, $id ) {
4452                 $ns = $title->getNamespace();
4453                 $dbk = $title->getDBkey();
4454                 if ( !isset( $this->mLinks[$ns] ) ) {
4455                         $this->mLinks[$ns] = array();
4456                 }
4457                 $this->mLinks[$ns][$dbk] = $id;
4458         }
4459
4460         function addTemplate( $title, $id ) {
4461                 $ns = $title->getNamespace();
4462                 $dbk = $title->getDBkey();
4463                 if ( !isset( $this->mTemplates[$ns] ) ) {
4464                         $this->mTemplates[$ns] = array();
4465                 }
4466                 $this->mTemplates[$ns][$dbk] = $id;
4467         }
4468
4469         /**
4470          * Return true if this cached output object predates the global or
4471          * per-article cache invalidation timestamps, or if it comes from
4472          * an incompatible older version.
4473          *
4474          * @param string $touched the affected article's last touched timestamp
4475          * @return bool
4476          * @public
4477          */
4478         function expired( $touched ) {
4479                 global $wgCacheEpoch;
4480                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4481                        $this->getCacheTime() < $touched ||
4482                        $this->getCacheTime() <= $wgCacheEpoch ||
4483                        !isset( $this->mVersion ) ||
4484                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4485         }
4486 }
4487
4488 /**
4489  * Set options of the Parser
4490  * @todo document
4491  * @package MediaWiki
4492  */
4493 class ParserOptions
4494 {
4495         # All variables are private
4496         var $mUseTeX;                    # Use texvc to expand <math> tags
4497         var $mUseDynamicDates;           # Use DateFormatter to format dates
4498         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
4499         var $mAllowExternalImages;       # Allow external images inline
4500         var $mAllowExternalImagesFrom;   # If not, any exception?
4501         var $mSkin;                      # Reference to the preferred skin
4502         var $mDateFormat;                # Date format index
4503         var $mEditSection;               # Create "edit section" links
4504         var $mNumberHeadings;            # Automatically number headings
4505         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
4506         var $mTidy;                      # Ask for tidy cleanup
4507         var $mInterfaceMessage;          # Which lang to call for PLURAL and GRAMMAR
4508
4509         function getUseTeX()                        { return $this->mUseTeX; }
4510         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4511         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4512         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4513         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4514         function &getSkin()                         { return $this->mSkin; }
4515         function getDateFormat()                    { return $this->mDateFormat; }
4516         function getEditSection()                   { return $this->mEditSection; }
4517         function getNumberHeadings()                { return $this->mNumberHeadings; }
4518         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4519         function getTidy()                          { return $this->mTidy; }
4520         function getInterfaceMessage()              { return $this->mInterfaceMessage; }
4521
4522         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4523         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4524         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4525         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4526         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4527         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4528         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4529         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4530         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4531         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4532         function setSkin( &$x ) { $this->mSkin =& $x; }
4533         function setInterfaceMessage( $x )          { return wfSetVar( $this->mInterfaceMessage, $x); }
4534
4535         function ParserOptions() {
4536                 global $wgUser;
4537                 $this->initialiseFromUser( $wgUser );
4538         }
4539
4540         /**
4541          * Get parser options
4542          * @static
4543          */
4544         function newFromUser( &$user ) {
4545                 $popts = new ParserOptions;
4546                 $popts->initialiseFromUser( $user );
4547                 return $popts;
4548         }
4549
4550         /** Get user options */
4551         function initialiseFromUser( &$userInput ) {
4552                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4553                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4554                 $fname = 'ParserOptions::initialiseFromUser';
4555                 wfProfileIn( $fname );
4556                 if ( !$userInput ) {
4557                         $user = new User;
4558                         $user->setLoaded( true );
4559                 } else {
4560                         $user =& $userInput;
4561                 }
4562
4563                 $this->mUseTeX = $wgUseTeX;
4564                 $this->mUseDynamicDates = $wgUseDynamicDates;
4565                 $this->mInterwikiMagic = $wgInterwikiMagic;
4566                 $this->mAllowExternalImages = $wgAllowExternalImages;
4567                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4568                 wfProfileIn( $fname.'-skin' );
4569                 $this->mSkin =& $user->getSkin();
4570                 wfProfileOut( $fname.'-skin' );
4571                 $this->mDateFormat = $user->getOption( 'date' );
4572                 $this->mEditSection = true;
4573                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4574                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4575                 $this->mTidy = false;
4576                 $this->mInterfaceMessage = false;
4577                 wfProfileOut( $fname );
4578         }
4579 }
4580
4581 /**
4582  * Callback function used by Parser::replaceLinkHolders()
4583  * to substitute link placeholders.
4584  */
4585 function &wfOutputReplaceMatches( $matches ) {
4586         global $wgOutputReplace;
4587         return $wgOutputReplace[$matches[1]];
4588 }
4589
4590 /**
4591  * Return the total number of articles
4592  */
4593 function wfNumberOfArticles() {
4594         global $wgNumberOfArticles;
4595
4596         wfLoadSiteStats();
4597         return $wgNumberOfArticles;
4598 }
4599
4600 /**
4601  * Return the number of files
4602  */
4603 function wfNumberOfFiles() {
4604         $fname = 'wfNumberOfFiles';
4605
4606         wfProfileIn( $fname );
4607         $dbr =& wfGetDB( DB_SLAVE );
4608         $numImages = $dbr->selectField('site_stats', 'ss_images', array(), $fname );
4609         wfProfileOut( $fname );
4610
4611         return $numImages;
4612 }
4613
4614 /**
4615  * Return the number of user accounts
4616  * @return integer
4617  */
4618 function wfNumberOfUsers() {
4619         wfProfileIn( 'wfNumberOfUsers' );
4620         $dbr =& wfGetDB( DB_SLAVE );
4621         $count = $dbr->selectField( 'site_stats', 'ss_users', array(), 'wfNumberOfUsers' );
4622         wfProfileOut( 'wfNumberOfUsers' );
4623         return (int)$count;
4624 }
4625
4626 /**
4627  * Return the total number of pages
4628  * @return integer
4629  */
4630 function wfNumberOfPages() {
4631         wfProfileIn( 'wfNumberOfPages' );
4632         $dbr =& wfGetDB( DB_SLAVE );
4633         $count = $dbr->selectField( 'site_stats', 'ss_total_pages', array(), 'wfNumberOfPages' );
4634         wfProfileOut( 'wfNumberOfPages' );
4635         return (int)$count;
4636 }
4637
4638 /**
4639  * Get various statistics from the database
4640  * @private
4641  */
4642 function wfLoadSiteStats() {
4643         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4644         $fname = 'wfLoadSiteStats';
4645
4646         if ( -1 != $wgNumberOfArticles ) return;
4647         $dbr =& wfGetDB( DB_SLAVE );
4648         $s = $dbr->selectRow( 'site_stats',
4649                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4650                 array( 'ss_row_id' => 1 ), $fname
4651         );
4652
4653         if ( $s === false ) {
4654                 return;
4655         } else {
4656                 $wgTotalViews = $s->ss_total_views;
4657                 $wgTotalEdits = $s->ss_total_edits;
4658                 $wgNumberOfArticles = $s->ss_good_articles;
4659         }
4660 }
4661
4662 /**
4663  * Escape html tags
4664  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4665  *
4666  * @param $in String: text that might contain HTML tags.
4667  * @return string Escaped string
4668  */
4669 function wfEscapeHTMLTagsOnly( $in ) {
4670         return str_replace(
4671                 array( '"', '>', '<' ),
4672                 array( '&quot;', '&gt;', '&lt;' ),
4673                 $in );
4674 }
4675
4676 ?>