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, but excluding newlines
  51 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x0a\\x0d]' );
  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',  '/\[(\b(' . wfUrlProtocols() . ')'.
  55         EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  56 define( 'EXT_IMAGE_REGEX',
  57         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  58         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  59         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  60 );
  61
  62 // State constants for the definition list colon extraction
  63 define( 'MW_COLON_STATE_TEXT', 0 );
  64 define( 'MW_COLON_STATE_TAG', 1 );
  65 define( 'MW_COLON_STATE_TAGSTART', 2 );
  66 define( 'MW_COLON_STATE_CLOSETAG', 3 );
  67 define( 'MW_COLON_STATE_TAGSLASH', 4 );
  68 define( 'MW_COLON_STATE_COMMENT', 5 );
  69 define( 'MW_COLON_STATE_COMMENTDASH', 6 );
  70 define( 'MW_COLON_STATE_COMMENTDASHDASH', 7 );
  71
  72 /**
  73  * PHP Parser
  74  *
  75  * Processes wiki markup
  76  *
  77  * <pre>
  78  * There are three main entry points into the Parser class:
  79  * parse()
  80  *   produces HTML output
  81  * preSaveTransform().
  82  *   produces altered wiki markup.
  83  * transformMsg()
  84  *   performs brace substitution on MediaWiki messages
  85  *
  86  * Globals used:
  87  *    objects:   $wgLang, $wgContLang
  88  *
  89  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  90  *
  91  * settings:
  92  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  93  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  94  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  95  *
  96  *  * only within ParserOptions
  97  * </pre>
  98  *
  99  * @package MediaWiki
 100  */
 101 class Parser
 102 {
 103         /**#@+
 104          * @private
 105          */
 106         # Persistent:
 107         var $mTagHooks, $mFunctionHooks;
 108
 109         # Cleared with clearState():
 110         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 111         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 112         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 113         var $mTemplates,        // cache of already loaded templates, avoids
 114                                 // multiple SQL queries for the same string
 115             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 116                                 // in this path. Used for loop detection.
 117
 118         # Temporary
 119         # These are variables reset at least once per parse regardless of $clearState
 120         var $mOptions,      // ParserOptions object
 121                 $mTitle,        // Title context, used for self-link rendering and similar things
 122                 $mOutputType,   // Output type, one of the OT_xxx constants
 123                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 124
 125         /**#@-*/
 126
 127         /**
 128          * Constructor
 129          *
 130          * @public
 131          */
 132         function Parser() {
 133                 $this->mTagHooks = array();
 134                 $this->mFunctionHooks = array();
 135                 $this->clearState();
 136                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 137         }
 138
 139         /**
 140          * Clear Parser state
 141          *
 142          * @private
 143          */
 144         function clearState() {
 145                 $this->mOutput = new ParserOutput;
 146                 $this->mAutonumber = 0;
 147                 $this->mLastSection = '';
 148                 $this->mDTopen = false;
 149                 $this->mVariables = false;
 150                 $this->mIncludeCount = array();
 151                 $this->mStripState = array();
 152                 $this->mArgStack = array();
 153                 $this->mInPre = false;
 154                 $this->mInterwikiLinkHolders = array(
 155                         'texts' => array(),
 156                         'titles' => array()
 157                 );
 158                 $this->mLinkHolders = array(
 159                         'namespaces' => array(),
 160                         'dbkeys' => array(),
 161                         'queries' => array(),
 162                         'texts' => array(),
 163                         'titles' => array()
 164                 );
 165                 $this->mRevisionId = null;
 166
 167                 /**
 168                  * Prefix for temporary replacement strings for the multipass parser.
 169                  * \x07 should never appear in input as it's disallowed in XML.
 170                  * Using it at the front also gives us a little extra robustness
 171                  * since it shouldn't match when butted up against identifier-like
 172                  * string constructs.
 173                  */
 174                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 175
 176                 # Clear these on every parse, bug 4549
 177                 $this->mTemplates = array();
 178                 $this->mTemplatePath = array();
 179
 180                 $this->mShowToc = true;
 181                 $this->mForceTocPosition = false;
 182
 183                 wfRunHooks( 'ParserClearState', array( &$this ) );
 184         }
 185
 186         /**
 187          * Accessor for mUniqPrefix.
 188          *
 189          * @public
 190          */
 191         function UniqPrefix() {
 192                 return $this->mUniqPrefix;
 193         }
 194
 195         /**
 196          * Convert wikitext to HTML
 197          * Do not call this function recursively.
 198          *
 199          * @private
 200          * @param string $text Text we want to parse
 201          * @param Title &$title A title object
 202          * @param array $options
 203          * @param boolean $linestart
 204          * @param boolean $clearState
 205          * @param int $revid number to pass in {{REVISIONID}}
 206          * @return ParserOutput a ParserOutput
 207          */
 208         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 209                 /**
 210                  * First pass--just handle <nowiki> sections, pass the rest off
 211                  * to internalParse() which does all the real work.
 212                  */
 213
 214                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 215                 $fname = 'Parser::parse';
 216                 wfProfileIn( $fname );
 217
 218                 if ( $clearState ) {
 219                         $this->clearState();
 220                 }
 221
 222                 $this->mOptions = $options;
 223                 $this->mTitle =& $title;
 224                 $this->mRevisionId = $revid;
 225                 $this->mOutputType = OT_HTML;
 226
 227                 //$text = $this->strip( $text, $this->mStripState );
 228                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 229                 $x =& $this->mStripState;
 230
 231                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 232                 $text = $this->strip( $text, $x );
 233                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 234
 235                 # Hook to suspend the parser in this state
 236                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 237                         wfProfileOut( $fname );
 238                         return $text ;
 239                 }
 240
 241                 $text = $this->internalParse( $text );
 242
 243                 $text = $this->unstrip( $text, $this->mStripState );
 244
 245                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 246                 $fixtags = array(
 247                         # french spaces, last one Guillemet-left
 248                         # only if there is something before the space
 249                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 250                         # french spaces, Guillemet-right
 251                         '/(\\302\\253) /' => '\\1&nbsp;',
 252                 );
 253                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 254
 255                 # only once and last
 256                 $text = $this->doBlockLevels( $text, $linestart );
 257
 258                 $this->replaceLinkHolders( $text );
 259
 260                 # the position of the parserConvert() call should not be changed. it
 261                 # assumes that the links are all replaced and the only thing left
 262                 # is the <nowiki> mark.
 263                 # Side-effects: this calls $this->mOutput->setTitleText()
 264                 $text = $wgContLang->parserConvert( $text, $this );
 265
 266                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 267
 268                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 269
 270                 $text = Sanitizer::normalizeCharReferences( $text );
 271
 272                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 273                         $text = Parser::tidy($text);
 274                 } else {
 275                         # attempt to sanitize at least some nesting problems
 276                         # (bug #2702 and quite a few others)
 277                         $tidyregs = array(
 278                                 # ''Something [http://www.cool.com cool''] -->
 279                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 280                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 281                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 282                                 # fix up an anchor inside another anchor, only
 283                                 # at least for a single single nested link (bug 3695)
 284                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 285                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 286                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 287                                 # contains a div, so fix it up here; replace
 288                                 # div with escaped text
 289                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 290                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 291                                 # remove empty italic or bold tag pairs, some
 292                                 # introduced by rules above
 293                                 '/<([bi])><\/\\1>/' => ''
 294                         );
 295
 296                         $text = preg_replace(
 297                                 array_keys( $tidyregs ),
 298                                 array_values( $tidyregs ),
 299                                 $text );
 300                 }
 301
 302                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 303
 304                 $this->mOutput->setText( $text );
 305                 wfProfileOut( $fname );
 306
 307                 return $this->mOutput;
 308         }
 309
 310         /**
 311          * Get a random string
 312          *
 313          * @private
 314          * @static
 315          */
 316         function getRandomString() {
 317                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 318         }
 319
 320         function &getTitle() { return $this->mTitle; }
 321         function getOptions() { return $this->mOptions; }
 322
 323         /**
 324          * Replaces all occurrences of HTML-style comments and the given tags
 325          * in the text with a random marker and returns teh next text. The output
 326          * parameter $matches will be an associative array filled with data in
 327          * the form:
 328          *   'UNIQ-xxxxx' => array(
 329          *     'element',
 330          *     'tag content',
 331          *     array( 'param' => 'x' ),
 332          *     '<element param="x">tag content</element>' ) )
 333          *
 334          * @param $elements list of element names. Comments are always extracted.
 335          * @param $text Source text string.
 336          * @param $uniq_prefix
 337          *
 338          * @private
 339          * @static
 340          */
 341         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 342                 $rand = Parser::getRandomString();
 343                 $n = 1;
 344                 $stripped = '';
 345                 $matches = array();
 346
 347                 $taglist = implode( '|', $elements );
 348                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 349
 350                 while ( '' != $text ) {
 351                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 352                         $stripped .= $p[0];
 353                         if( count( $p ) < 5 ) {
 354                                 break;
 355                         }
 356                         if( count( $p ) > 5 ) {
 357                                 // comment
 358                                 $element    = $p[4];
 359                                 $attributes = '';
 360                                 $close      = '';
 361                                 $inside     = $p[5];
 362                         } else {
 363                                 // tag
 364                                 $element    = $p[1];
 365                                 $attributes = $p[2];
 366                                 $close      = $p[3];
 367                                 $inside     = $p[4];
 368                         }
 369
 370                         $marker = "$uniq_prefix-$element-$rand" . sprintf('%08X', $n++) . '-QINU';
 371                         $stripped .= $marker;
 372
 373                         if ( $close === '/>' ) {
 374                                 // Empty element tag, <tag />
 375                                 $content = null;
 376                                 $text = $inside;
 377                                 $tail = null;
 378                         } else {
 379                                 if( $element == '!--' ) {
 380                                         $end = '/(-->)/';
 381                                 } else {
 382                                         $end = "/(<\\/$element\\s*>)/i";
 383                                 }
 384                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 385                                 $content = $q[0];
 386                                 if( count( $q ) < 3 ) {
 387                                         # No end tag -- let it run out to the end of the text.
 388                                         $tail = '';
 389                                         $text = '';
 390                                 } else {
 391                                         $tail = $q[1];
 392                                         $text = $q[2];
 393                                 }
 394                         }
 395
 396                         $matches[$marker] = array( $element,
 397                                 $content,
 398                                 Sanitizer::decodeTagAttributes( $attributes ),
 399                                 "<$element$attributes$close$content$tail" );
 400                 }
 401                 return $stripped;
 402         }
 403
 404         /**
 405          * Strips and renders nowiki, pre, math, hiero
 406          * If $render is set, performs necessary rendering operations on plugins
 407          * Returns the text, and fills an array with data needed in unstrip()
 408          * If the $state is already a valid strip state, it adds to the state
 409          *
 410          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 411          *  will be stripped in addition to other tags. This is important
 412          *  for section editing, where these comments cause confusion when
 413          *  counting the sections in the wikisource
 414          *
 415          * @private
 416          */
 417         function strip( $text, &$state, $stripcomments = false ) {
 418                 $render = ($this->mOutputType == OT_HTML);
 419
 420                 # Replace any instances of the placeholders
 421                 $uniq_prefix = $this->mUniqPrefix;
 422                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 423                 $commentState = array();
 424
 425                 $elements = array_merge(
 426                         array( 'nowiki', 'gallery' ),
 427                         array_keys( $this->mTagHooks ) );
 428                 global $wgRawHtml;
 429                 if( $wgRawHtml ) {
 430                         $elements[] = 'html';
 431                 }
 432                 if( $this->mOptions->getUseTeX() ) {
 433                         $elements[] = 'math';
 434                 }
 435
 436
 437                 $matches = array();
 438                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 439
 440                 foreach( $matches as $marker => $data ) {
 441                         list( $element, $content, $params, $tag ) = $data;
 442                         if( $render ) {
 443                                 $tagName = strtolower( $element );
 444                                 switch( $tagName ) {
 445                                 case '!--':
 446                                         // Comment
 447                                         if( substr( $tag, -3 ) == '-->' ) {
 448                                                 $output = $tag;
 449                                         } else {
 450                                                 // Unclosed comment in input.
 451                                                 // Close it so later stripping can remove it
 452                                                 $output = "$tag-->";
 453                                         }
 454                                         break;
 455                                 case 'html':
 456                                         if( $wgRawHtml ) {
 457                                                 $output = $content;
 458                                                 break;
 459                                         }
 460                                         // Shouldn't happen otherwise. :)
 461                                 case 'nowiki':
 462                                         $output = wfEscapeHTMLTagsOnly( $content );
 463                                         break;
 464                                 case 'math':
 465                                         $output = MathRenderer::renderMath( $content );
 466                                         break;
 467                                 case 'gallery':
 468                                         $output = $this->renderImageGallery( $content );
 469                                         break;
 470                                 default:
 471                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 472                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 473                                                         array( $content, $params, $this ) );
 474                                         } else {
 475                                                 throw new MWException( "Invalid call hook $element" );
 476                                         }
 477                                 }
 478                         } else {
 479                                 // Just stripping tags; keep the source
 480                                 $output = $tag;
 481                         }
 482                         if( !$stripcomments && $element == '!--' ) {
 483                                 $commentState[$marker] = $output;
 484                         } else {
 485                                 $state[$element][$marker] = $output;
 486                         }
 487                 }
 488
 489                 # Unstrip comments unless explicitly told otherwise.
 490                 # (The comments are always stripped prior to this point, so as to
 491                 # not invoke any extension tags / parser hooks contained within
 492                 # a comment.)
 493                 if ( !$stripcomments ) {
 494                         // Put them all back and forget them
 495                         $text = strtr( $text, $commentState );
 496                 }
 497
 498                 return $text;
 499         }
 500
 501         /**
 502          * Restores pre, math, and other extensions removed by strip()
 503          *
 504          * always call unstripNoWiki() after this one
 505          * @private
 506          */
 507         function unstrip( $text, &$state ) {
 508                 if ( !is_array( $state ) ) {
 509                         return $text;
 510                 }
 511
 512                 $replacements = array();
 513                 foreach( $state as $tag => $contentDict ) {
 514                         if( $tag != 'nowiki' && $tag != 'html' ) {
 515                                 foreach( $contentDict as $uniq => $content ) {
 516                                         $replacements[$uniq] = $content;
 517                                 }
 518                         }
 519                 }
 520                 $text = strtr( $text, $replacements );
 521
 522                 return $text;
 523         }
 524
 525         /**
 526          * Always call this after unstrip() to preserve the order
 527          *
 528          * @private
 529          */
 530         function unstripNoWiki( $text, &$state ) {
 531                 if ( !is_array( $state ) ) {
 532                         return $text;
 533                 }
 534
 535                 $replacements = array();
 536                 foreach( $state as $tag => $contentDict ) {
 537                         if( $tag == 'nowiki' || $tag == 'html' ) {
 538                                 foreach( $contentDict as $uniq => $content ) {
 539                                         $replacements[$uniq] = $content;
 540                                 }
 541                         }
 542                 }
 543                 $text = strtr( $text, $replacements );
 544
 545                 return $text;
 546         }
 547
 548         /**
 549          * Add an item to the strip state
 550          * Returns the unique tag which must be inserted into the stripped text
 551          * The tag will be replaced with the original text in unstrip()
 552          *
 553          * @private
 554          */
 555         function insertStripItem( $text, &$state ) {
 556                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 557                 if ( !$state ) {
 558                         $state = array();
 559                 }
 560                 $state['item'][$rnd] = $text;
 561                 return $rnd;
 562         }
 563
 564         /**
 565          * Interface with html tidy, used if $wgUseTidy = true.
 566          * If tidy isn't able to correct the markup, the original will be
 567          * returned in all its glory with a warning comment appended.
 568          *
 569          * Either the external tidy program or the in-process tidy extension
 570          * will be used depending on availability. Override the default
 571          * $wgTidyInternal setting to disable the internal if it's not working.
 572          *
 573          * @param string $text Hideous HTML input
 574          * @return string Corrected HTML output
 575          * @public
 576          * @static
 577          */
 578         function tidy( $text ) {
 579                 global $wgTidyInternal;
 580                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 581 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 582 '<head><title>test</title></head><body>'.$text.'</body></html>';
 583                 if( $wgTidyInternal ) {
 584                         $correctedtext = Parser::internalTidy( $wrappedtext );
 585                 } else {
 586                         $correctedtext = Parser::externalTidy( $wrappedtext );
 587                 }
 588                 if( is_null( $correctedtext ) ) {
 589                         wfDebug( "Tidy error detected!\n" );
 590                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 591                 }
 592                 return $correctedtext;
 593         }
 594
 595         /**
 596          * Spawn an external HTML tidy process and get corrected markup back from it.
 597          *
 598          * @private
 599          * @static
 600          */
 601         function externalTidy( $text ) {
 602                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 603                 $fname = 'Parser::externalTidy';
 604                 wfProfileIn( $fname );
 605
 606                 $cleansource = '';
 607                 $opts = ' -utf8';
 608
 609                 $descriptorspec = array(
 610                         0 => array('pipe', 'r'),
 611                         1 => array('pipe', 'w'),
 612                         2 => array('file', '/dev/null', 'a')
 613                 );
 614                 $pipes = array();
 615                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 616                 if (is_resource($process)) {
 617                         // Theoretically, this style of communication could cause a deadlock
 618                         // here. If the stdout buffer fills up, then writes to stdin could
 619                         // block. This doesn't appear to happen with tidy, because tidy only
 620                         // writes to stdout after it's finished reading from stdin. Search
 621                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 622                         fwrite($pipes[0], $text);
 623                         fclose($pipes[0]);
 624                         while (!feof($pipes[1])) {
 625                                 $cleansource .= fgets($pipes[1], 1024);
 626                         }
 627                         fclose($pipes[1]);
 628                         proc_close($process);
 629                 }
 630
 631                 wfProfileOut( $fname );
 632
 633                 if( $cleansource == '' && $text != '') {
 634                         // Some kind of error happened, so we couldn't get the corrected text.
 635                         // Just give up; we'll use the source text and append a warning.
 636                         return null;
 637                 } else {
 638                         return $cleansource;
 639                 }
 640         }
 641
 642         /**
 643          * Use the HTML tidy PECL extension to use the tidy library in-process,
 644          * saving the overhead of spawning a new process. Currently written to
 645          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 646          *
 647          * 'pear install tidy' should be able to compile the extension module.
 648          *
 649          * @private
 650          * @static
 651          */
 652         function internalTidy( $text ) {
 653                 global $wgTidyConf;
 654                 $fname = 'Parser::internalTidy';
 655                 wfProfileIn( $fname );
 656
 657                 tidy_load_config( $wgTidyConf );
 658                 tidy_set_encoding( 'utf8' );
 659                 tidy_parse_string( $text );
 660                 tidy_clean_repair();
 661                 if( tidy_get_status() == 2 ) {
 662                         // 2 is magic number for fatal error
 663                         // http://www.php.net/manual/en/function.tidy-get-status.php
 664                         $cleansource = null;
 665                 } else {
 666                         $cleansource = tidy_get_output();
 667                 }
 668                 wfProfileOut( $fname );
 669                 return $cleansource;
 670         }
 671
 672         /**
 673          * parse the wiki syntax used to render tables
 674          *
 675          * @private
 676          */
 677         function doTableStuff ( $t ) {
 678                 $fname = 'Parser::doTableStuff';
 679                 wfProfileIn( $fname );
 680
 681                 $t = explode ( "\n" , $t ) ;
 682                 $td = array () ; # Is currently a td tag open?
 683                 $ltd = array () ; # Was it TD or TH?
 684                 $tr = array () ; # Is currently a tr tag open?
 685                 $ltr = array () ; # tr attributes
 686                 $has_opened_tr = array(); # Did this table open a <tr> element?
 687                 $indent_level = 0; # indent level of the table
 688                 foreach ( $t AS $k => $x )
 689                 {
 690                         $x = trim ( $x ) ;
 691                         $fc = substr ( $x , 0 , 1 ) ;
 692                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 693                                 $indent_level = strlen( $matches[1] );
 694
 695                                 $attributes = $this->unstripForHTML( $matches[2] );
 696
 697                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 698                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 699                                 array_push ( $td , false ) ;
 700                                 array_push ( $ltd , '' ) ;
 701                                 array_push ( $tr , false ) ;
 702                                 array_push ( $ltr , '' ) ;
 703                                 array_push ( $has_opened_tr, false );
 704                         }
 705                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 706                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 707                                 $z = "</table>" . substr ( $x , 2);
 708                                 $l = array_pop ( $ltd ) ;
 709                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 710                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 711                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 712                                 array_pop ( $ltr ) ;
 713                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 714                         }
 715                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 716                                 $x = substr ( $x , 1 ) ;
 717                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 718                                 $z = '' ;
 719                                 $l = array_pop ( $ltd ) ;
 720                                 array_pop ( $has_opened_tr );
 721                                 array_push ( $has_opened_tr , true ) ;
 722                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 723                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 724                                 array_pop ( $ltr ) ;
 725                                 $t[$k] = $z ;
 726                                 array_push ( $tr , false ) ;
 727                                 array_push ( $td , false ) ;
 728                                 array_push ( $ltd , '' ) ;
 729                                 $attributes = $this->unstripForHTML( $x );
 730                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 731                         }
 732                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 733                                 # $x is a table row
 734                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 735                                         $fc = '+' ;
 736                                         $x = substr ( $x , 1 ) ;
 737                                 }
 738                                 $after = substr ( $x , 1 ) ;
 739                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 740
 741                                 // Split up multiple cells on the same line.
 742                                 // FIXME: This can result in improper nesting of tags processed
 743                                 // by earlier parser steps, but should avoid splitting up eg
 744                                 // attribute values containing literal "||".
 745                                 $after = wfExplodeMarkup( '||', $after );
 746
 747                                 $t[$k] = '' ;
 748
 749                                 # Loop through each table cell
 750                                 foreach ( $after AS $theline )
 751                                 {
 752                                         $z = '' ;
 753                                         if ( $fc != '+' )
 754                                         {
 755                                                 $tra = array_pop ( $ltr ) ;
 756                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 757                                                 array_push ( $tr , true ) ;
 758                                                 array_push ( $ltr , '' ) ;
 759                                                 array_pop ( $has_opened_tr );
 760                                                 array_push ( $has_opened_tr , true ) ;
 761                                         }
 762
 763                                         $l = array_pop ( $ltd ) ;
 764                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 765                                         if ( $fc == '|' ) $l = 'td' ;
 766                                         else if ( $fc == '!' ) $l = 'th' ;
 767                                         else if ( $fc == '+' ) $l = 'caption' ;
 768                                         else $l = '' ;
 769                                         array_push ( $ltd , $l ) ;
 770
 771                                         # Cell parameters
 772                                         $y = explode ( '|' , $theline , 2 ) ;
 773                                         # Note that a '|' inside an invalid link should not
 774                                         # be mistaken as delimiting cell parameters
 775                                         if ( strpos( $y[0], '[[' ) !== false ) {
 776                                                 $y = array ($theline);
 777                                         }
 778                                         if ( count ( $y ) == 1 )
 779                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 780                                         else {
 781                                                 $attributes = $this->unstripForHTML( $y[0] );
 782                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 783                                         }
 784                                         $t[$k] .= $y ;
 785                                         array_push ( $td , true ) ;
 786                                 }
 787                         }
 788                 }
 789
 790                 # Closing open td, tr && table
 791                 while ( count ( $td ) > 0 )
 792                 {
 793                         $l = array_pop ( $ltd ) ;
 794                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 795                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 796                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 797                         $t[] = '</table>' ;
 798                 }
 799
 800                 $t = implode ( "\n" , $t ) ;
 801                 # special case: don't return empty table
 802                 if($t == "<table>\n<tr><td></td></tr>\n</table>")
 803                         $t = '';
 804                 wfProfileOut( $fname );
 805                 return $t ;
 806         }
 807
 808         /**
 809          * Helper function for parse() that transforms wiki markup into
 810          * HTML. Only called for $mOutputType == OT_HTML.
 811          *
 812          * @private
 813          */
 814         function internalParse( $text ) {
 815                 $args = array();
 816                 $isMain = true;
 817                 $fname = 'Parser::internalParse';
 818                 wfProfileIn( $fname );
 819
 820                 # Remove <noinclude> tags and <includeonly> sections
 821                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 822                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 823                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 824
 825                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 826
 827                 $text = $this->replaceVariables( $text, $args );
 828
 829                 // Tables need to come after variable replacement for things to work
 830                 // properly; putting them before other transformations should keep
 831                 // exciting things like link expansions from showing up in surprising
 832                 // places.
 833                 $text = $this->doTableStuff( $text );
 834
 835                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 836
 837                 $text = $this->stripToc( $text );
 838                 $text = $this->doHeadings( $text );
 839                 if($this->mOptions->getUseDynamicDates()) {
 840                         $df =& DateFormatter::getInstance();
 841                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 842                 }
 843                 $text = $this->doAllQuotes( $text );
 844                 $text = $this->replaceInternalLinks( $text );
 845                 $text = $this->replaceExternalLinks( $text );
 846
 847                 # replaceInternalLinks may sometimes leave behind
 848                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 849                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 850
 851                 $text = $this->doMagicLinks( $text );
 852                 $text = $this->formatHeadings( $text, $isMain );
 853
 854                 wfProfileOut( $fname );
 855                 return $text;
 856         }
 857
 858         /**
 859          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 860          * magic external links.
 861          *
 862          * @private
 863          */
 864         function &doMagicLinks( &$text ) {
 865                 $text = $this->magicISBN( $text );
 866                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 867                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 868                 return $text;
 869         }
 870
 871         /**
 872          * Parse headers and return html
 873          *
 874          * @private
 875          */
 876         function doHeadings( $text ) {
 877                 $fname = 'Parser::doHeadings';
 878                 wfProfileIn( $fname );
 879                 for ( $i = 6; $i >= 1; --$i ) {
 880                         $h = str_repeat( '=', $i );
 881                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
 882                           "<h{$i}>\\1</h{$i}>\\2", $text );
 883                 }
 884                 wfProfileOut( $fname );
 885                 return $text;
 886         }
 887
 888         /**
 889          * Replace single quotes with HTML markup
 890          * @private
 891          * @return string the altered text
 892          */
 893         function doAllQuotes( $text ) {
 894                 $fname = 'Parser::doAllQuotes';
 895                 wfProfileIn( $fname );
 896                 $outtext = '';
 897                 $lines = explode( "\n", $text );
 898                 foreach ( $lines as $line ) {
 899                         $outtext .= $this->doQuotes ( $line ) . "\n";
 900                 }
 901                 $outtext = substr($outtext, 0,-1);
 902                 wfProfileOut( $fname );
 903                 return $outtext;
 904         }
 905
 906         /**
 907          * Helper function for doAllQuotes()
 908          * @private
 909          */
 910         function doQuotes( $text ) {
 911                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 912                 if ( count( $arr ) == 1 )
 913                         return $text;
 914                 else
 915                 {
 916                         # First, do some preliminary work. This may shift some apostrophes from
 917                         # being mark-up to being text. It also counts the number of occurrences
 918                         # of bold and italics mark-ups.
 919                         $i = 0;
 920                         $numbold = 0;
 921                         $numitalics = 0;
 922                         foreach ( $arr as $r )
 923                         {
 924                                 if ( ( $i % 2 ) == 1 )
 925                                 {
 926                                         # If there are ever four apostrophes, assume the first is supposed to
 927                                         # be text, and the remaining three constitute mark-up for bold text.
 928                                         if ( strlen( $arr[$i] ) == 4 )
 929                                         {
 930                                                 $arr[$i-1] .= "'";
 931                                                 $arr[$i] = "'''";
 932                                         }
 933                                         # If there are more than 5 apostrophes in a row, assume they're all
 934                                         # text except for the last 5.
 935                                         else if ( strlen( $arr[$i] ) > 5 )
 936                                         {
 937                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 938                                                 $arr[$i] = "'''''";
 939                                         }
 940                                         # Count the number of occurrences of bold and italics mark-ups.
 941                                         # We are not counting sequences of five apostrophes.
 942                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 943                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 944                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 945                                 }
 946                                 $i++;
 947                         }
 948
 949                         # If there is an odd number of both bold and italics, it is likely
 950                         # that one of the bold ones was meant to be an apostrophe followed
 951                         # by italics. Which one we cannot know for certain, but it is more
 952                         # likely to be one that has a single-letter word before it.
 953                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 954                         {
 955                                 $i = 0;
 956                                 $firstsingleletterword = -1;
 957                                 $firstmultiletterword = -1;
 958                                 $firstspace = -1;
 959                                 foreach ( $arr as $r )
 960                                 {
 961                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 962                                         {
 963                                                 $x1 = substr ($arr[$i-1], -1);
 964                                                 $x2 = substr ($arr[$i-1], -2, 1);
 965                                                 if ($x1 == ' ') {
 966                                                         if ($firstspace == -1) $firstspace = $i;
 967                                                 } else if ($x2 == ' ') {
 968                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 969                                                 } else {
 970                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 971                                                 }
 972                                         }
 973                                         $i++;
 974                                 }
 975
 976                                 # If there is a single-letter word, use it!
 977                                 if ($firstsingleletterword > -1)
 978                                 {
 979                                         $arr [ $firstsingleletterword ] = "''";
 980                                         $arr [ $firstsingleletterword-1 ] .= "'";
 981                                 }
 982                                 # If not, but there's a multi-letter word, use that one.
 983                                 else if ($firstmultiletterword > -1)
 984                                 {
 985                                         $arr [ $firstmultiletterword ] = "''";
 986                                         $arr [ $firstmultiletterword-1 ] .= "'";
 987                                 }
 988                                 # ... otherwise use the first one that has neither.
 989                                 # (notice that it is possible for all three to be -1 if, for example,
 990                                 # there is only one pentuple-apostrophe in the line)
 991                                 else if ($firstspace > -1)
 992                                 {
 993                                         $arr [ $firstspace ] = "''";
 994                                         $arr [ $firstspace-1 ] .= "'";
 995                                 }
 996                         }
 997
 998                         # Now let's actually convert our apostrophic mush to HTML!
 999                         $output = '';
1000                         $buffer = '';
1001                         $state = '';
1002                         $i = 0;
1003                         foreach ($arr as $r)
1004                         {
1005                                 if (($i % 2) == 0)
1006                                 {
1007                                         if ($state == 'both')
1008                                                 $buffer .= $r;
1009                                         else
1010                                                 $output .= $r;
1011                                 }
1012                                 else
1013                                 {
1014                                         if (strlen ($r) == 2)
1015                                         {
1016                                                 if ($state == 'i')
1017                                                 { $output .= '</i>'; $state = ''; }
1018                                                 else if ($state == 'bi')
1019                                                 { $output .= '</i>'; $state = 'b'; }
1020                                                 else if ($state == 'ib')
1021                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1022                                                 else if ($state == 'both')
1023                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1024                                                 else # $state can be 'b' or ''
1025                                                 { $output .= '<i>'; $state .= 'i'; }
1026                                         }
1027                                         else if (strlen ($r) == 3)
1028                                         {
1029                                                 if ($state == 'b')
1030                                                 { $output .= '</b>'; $state = ''; }
1031                                                 else if ($state == 'bi')
1032                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1033                                                 else if ($state == 'ib')
1034                                                 { $output .= '</b>'; $state = 'i'; }
1035                                                 else if ($state == 'both')
1036                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1037                                                 else # $state can be 'i' or ''
1038                                                 { $output .= '<b>'; $state .= 'b'; }
1039                                         }
1040                                         else if (strlen ($r) == 5)
1041                                         {
1042                                                 if ($state == 'b')
1043                                                 { $output .= '</b><i>'; $state = 'i'; }
1044                                                 else if ($state == 'i')
1045                                                 { $output .= '</i><b>'; $state = 'b'; }
1046                                                 else if ($state == 'bi')
1047                                                 { $output .= '</i></b>'; $state = ''; }
1048                                                 else if ($state == 'ib')
1049                                                 { $output .= '</b></i>'; $state = ''; }
1050                                                 else if ($state == 'both')
1051                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1052                                                 else # ($state == '')
1053                                                 { $buffer = ''; $state = 'both'; }
1054                                         }
1055                                 }
1056                                 $i++;
1057                         }
1058                         # Now close all remaining tags.  Notice that the order is important.
1059                         if ($state == 'b' || $state == 'ib')
1060                                 $output .= '</b>';
1061                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1062                                 $output .= '</i>';
1063                         if ($state == 'bi')
1064                                 $output .= '</b>';
1065                         if ($state == 'both')
1066                                 $output .= '<b><i>'.$buffer.'</i></b>';
1067                         return $output;
1068                 }
1069         }
1070
1071         /**
1072          * Replace external links
1073          *
1074          * Note: this is all very hackish and the order of execution matters a lot.
1075          * Make sure to run maintenance/parserTests.php if you change this code.
1076          *
1077          * @private
1078          */
1079         function replaceExternalLinks( $text ) {
1080                 global $wgContLang;
1081                 $fname = 'Parser::replaceExternalLinks';
1082                 wfProfileIn( $fname );
1083
1084                 $sk =& $this->mOptions->getSkin();
1085
1086                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1087
1088                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1089
1090                 $i = 0;
1091                 while ( $i<count( $bits ) ) {
1092                         $url = $bits[$i++];
1093                         $protocol = $bits[$i++];
1094                         $text = $bits[$i++];
1095                         $trail = $bits[$i++];
1096
1097                         # The characters '<' and '>' (which were escaped by
1098                         # removeHTMLtags()) should not be included in
1099                         # URLs, per RFC 2396.
1100                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1101                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1102                                 $url = substr($url, 0, $m2[0][1]);
1103                         }
1104
1105                         # If the link text is an image URL, replace it with an <img> tag
1106                         # This happened by accident in the original parser, but some people used it extensively
1107                         $img = $this->maybeMakeExternalImage( $text );
1108                         if ( $img !== false ) {
1109                                 $text = $img;
1110                         }
1111
1112                         $dtrail = '';
1113
1114                         # Set linktype for CSS - if URL==text, link is essentially free
1115                         $linktype = ($text == $url) ? 'free' : 'text';
1116
1117                         # No link text, e.g. [http://domain.tld/some.link]
1118                         if ( $text == '' ) {
1119                                 # Autonumber if allowed. See bug #5918
1120                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1121                                         $text = '[' . ++$this->mAutonumber . ']';
1122                                         $linktype = 'autonumber';
1123                                 } else {
1124                                         # Otherwise just use the URL
1125                                         $text = htmlspecialchars( $url );
1126                                         $linktype = 'free';
1127                                 }
1128                         } else {
1129                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1130                                 # Check for trail
1131                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1132                         }
1133
1134                         $text = $wgContLang->markNoConversion($text);
1135
1136                         # Normalize any HTML entities in input. They will be
1137                         # re-escaped by makeExternalLink().
1138                         $url = Sanitizer::decodeCharReferences( $url );
1139
1140                         # Process the trail (i.e. everything after this link up until start of the next link),
1141                         # replacing any non-bracketed links
1142                         $trail = $this->replaceFreeExternalLinks( $trail );
1143
1144                         # Use the encoded URL
1145                         # This means that users can paste URLs directly into the text
1146                         # Funny characters like &ouml; aren't valid in URLs anyway
1147                         # This was changed in August 2004
1148                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1149
1150                         # Register link in the output object.
1151                         # Replace unnecessary URL escape codes with the referenced character
1152                         # This prevents spammers from hiding links from the filters
1153                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1154                         $this->mOutput->addExternalLink( $pasteurized );
1155                 }
1156
1157                 wfProfileOut( $fname );
1158                 return $s;
1159         }
1160
1161         /**
1162          * Replace anything that looks like a URL with a link
1163          * @private
1164          */
1165         function replaceFreeExternalLinks( $text ) {
1166                 global $wgContLang;
1167                 $fname = 'Parser::replaceFreeExternalLinks';
1168                 wfProfileIn( $fname );
1169
1170                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1171                 $s = array_shift( $bits );
1172                 $i = 0;
1173
1174                 $sk =& $this->mOptions->getSkin();
1175
1176                 while ( $i < count( $bits ) ){
1177                         $protocol = $bits[$i++];
1178                         $remainder = $bits[$i++];
1179
1180                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1181                                 # Found some characters after the protocol that look promising
1182                                 $url = $protocol . $m[1];
1183                                 $trail = $m[2];
1184
1185                                 # special case: handle urls as url args:
1186                                 # http://www.example.com/foo?=http://www.example.com/bar
1187                                 if(strlen($trail) == 0 &&
1188                                         isset($bits[$i]) &&
1189                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1190                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1191                                 {
1192                                         # add protocol, arg
1193                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1194                                         $i += 2;
1195                                         $trail = $m[2];
1196                                 }
1197
1198                                 # The characters '<' and '>' (which were escaped by
1199                                 # removeHTMLtags()) should not be included in
1200                                 # URLs, per RFC 2396.
1201                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1202                                         $trail = substr($url, $m2[0][1]) . $trail;
1203                                         $url = substr($url, 0, $m2[0][1]);
1204                                 }
1205
1206                                 # Move trailing punctuation to $trail
1207                                 $sep = ',;\.:!?';
1208                                 # If there is no left bracket, then consider right brackets fair game too
1209                                 if ( strpos( $url, '(' ) === false ) {
1210                                         $sep .= ')';
1211                                 }
1212
1213                                 $numSepChars = strspn( strrev( $url ), $sep );
1214                                 if ( $numSepChars ) {
1215                                         $trail = substr( $url, -$numSepChars ) . $trail;
1216                                         $url = substr( $url, 0, -$numSepChars );
1217                                 }
1218
1219                                 # Normalize any HTML entities in input. They will be
1220                                 # re-escaped by makeExternalLink() or maybeMakeExternalImage()
1221                                 $url = Sanitizer::decodeCharReferences( $url );
1222
1223                                 # Is this an external image?
1224                                 $text = $this->maybeMakeExternalImage( $url );
1225                                 if ( $text === false ) {
1226                                         # Not an image, make a link
1227                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1228                                         # Register it in the output object...
1229                                         # Replace unnecessary URL escape codes with their equivalent characters
1230                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1231                                         $this->mOutput->addExternalLink( $pasteurized );
1232                                 }
1233                                 $s .= $text . $trail;
1234                         } else {
1235                                 $s .= $protocol . $remainder;
1236                         }
1237                 }
1238                 wfProfileOut( $fname );
1239                 return $s;
1240         }
1241
1242         /**
1243          * Replace unusual URL escape codes with their equivalent characters
1244          * @param string
1245          * @return string
1246          * @static
1247          * @fixme This can merge genuinely required bits in the path or query string,
1248          *        breaking legit URLs. A proper fix would treat the various parts of
1249          *        the URL differently; as a workaround, just use the output for
1250          *        statistical records, not for actual linking/output.
1251          */
1252         function replaceUnusualEscapes( $url ) {
1253                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1254                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1255         }
1256
1257         /**
1258          * Callback function used in replaceUnusualEscapes().
1259          * Replaces unusual URL escape codes with their equivalent character
1260          * @static
1261          * @private
1262          */
1263         function replaceUnusualEscapesCallback( $matches ) {
1264                 $char = urldecode( $matches[0] );
1265                 $ord = ord( $char );
1266                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1267                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1268                         // No, shouldn't be escaped
1269                         return $char;
1270                 } else {
1271                         // Yes, leave it escaped
1272                         return $matches[0];
1273                 }
1274         }
1275
1276         /**
1277          * make an image if it's allowed, either through the global
1278          * option or through the exception
1279          * @private
1280          */
1281         function maybeMakeExternalImage( $url ) {
1282                 $sk =& $this->mOptions->getSkin();
1283                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1284                 $imagesexception = !empty($imagesfrom);
1285                 $text = false;
1286                 if ( $this->mOptions->getAllowExternalImages()
1287                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1288                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1289                                 # Image found
1290                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1291                         }
1292                 }
1293                 return $text;
1294         }
1295
1296         /**
1297          * Process [[ ]] wikilinks
1298          *
1299          * @private
1300          */
1301         function replaceInternalLinks( $s ) {
1302                 global $wgContLang;
1303                 static $fname = 'Parser::replaceInternalLinks' ;
1304
1305                 wfProfileIn( $fname );
1306
1307                 wfProfileIn( $fname.'-setup' );
1308                 static $tc = FALSE;
1309                 # the % is needed to support urlencoded titles as well
1310                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1311
1312                 $sk =& $this->mOptions->getSkin();
1313
1314                 #split the entire text string on occurences of [[
1315                 $a = explode( '[[', ' ' . $s );
1316                 #get the first element (all text up to first [[), and remove the space we added
1317                 $s = array_shift( $a );
1318                 $s = substr( $s, 1 );
1319
1320                 # Match a link having the form [[namespace:link|alternate]]trail
1321                 static $e1 = FALSE;
1322                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1323                 # Match cases where there is no "]]", which might still be images
1324                 static $e1_img = FALSE;
1325                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1326                 # Match the end of a line for a word that's not followed by whitespace,
1327                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1328                 $e2 = wfMsgForContent( 'linkprefix' );
1329
1330                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1331
1332                 if( is_null( $this->mTitle ) ) {
1333                         throw new MWException( 'nooo' );
1334                 }
1335                 $nottalk = !$this->mTitle->isTalkPage();
1336
1337                 if ( $useLinkPrefixExtension ) {
1338                         if ( preg_match( $e2, $s, $m ) ) {
1339                                 $first_prefix = $m[2];
1340                         } else {
1341                                 $first_prefix = false;
1342                         }
1343                 } else {
1344                         $prefix = '';
1345                 }
1346
1347                 $selflink = $this->mTitle->getPrefixedText();
1348                 wfProfileOut( $fname.'-setup' );
1349
1350                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1351                 $useSubpages = $this->areSubpagesAllowed();
1352
1353                 # Loop for each link
1354                 for ($k = 0; isset( $a[$k] ); $k++) {
1355                         $line = $a[$k];
1356                         if ( $useLinkPrefixExtension ) {
1357                                 wfProfileIn( $fname.'-prefixhandling' );
1358                                 if ( preg_match( $e2, $s, $m ) ) {
1359                                         $prefix = $m[2];
1360                                         $s = $m[1];
1361                                 } else {
1362                                         $prefix='';
1363                                 }
1364                                 # first link
1365                                 if($first_prefix) {
1366                                         $prefix = $first_prefix;
1367                                         $first_prefix = false;
1368                                 }
1369                                 wfProfileOut( $fname.'-prefixhandling' );
1370                         }
1371
1372                         $might_be_img = false;
1373
1374                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1375                                 $text = $m[2];
1376                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1377                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1378                                 # the real problem is with the $e1 regex
1379                                 # See bug 1300.
1380                                 #
1381                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1382                                 # and no image is in sight. See bug 2095.
1383                                 #
1384                                 if( $text !== '' &&
1385                                         preg_match( "/^\](.*)/s", $m[3], $n ) &&
1386                                         strpos($text, '[') !== false
1387                                 )
1388                                 {
1389                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1390                                         $m[3] = $n[1];
1391                                 }
1392                                 # fix up urlencoded title texts
1393                                 if(preg_match('/%/', $m[1] ))
1394                                         # Should anchors '#' also be rejected?
1395                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1396                                 $trail = $m[3];
1397                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1398                                 $might_be_img = true;
1399                                 $text = $m[2];
1400                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1401                                 $trail = "";
1402                         } else { # Invalid form; output directly
1403                                 $s .= $prefix . '[[' . $line ;
1404                                 continue;
1405                         }
1406
1407                         # Don't allow internal links to pages containing
1408                         # PROTO: where PROTO is a valid URL protocol; these
1409                         # should be external links.
1410                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1411                                 $s .= $prefix . '[[' . $line ;
1412                                 continue;
1413                         }
1414
1415                         # Make subpage if necessary
1416                         if( $useSubpages ) {
1417                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1418                         } else {
1419                                 $link = $m[1];
1420                         }
1421
1422                         $noforce = (substr($m[1], 0, 1) != ':');
1423                         if (!$noforce) {
1424                                 # Strip off leading ':'
1425                                 $link = substr($link, 1);
1426                         }
1427
1428                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1429                         if( !$nt ) {
1430                                 $s .= $prefix . '[[' . $line;
1431                                 continue;
1432                         }
1433
1434                         #check other language variants of the link
1435                         #if the article does not exist
1436                         if( $checkVariantLink
1437                             && $nt->getArticleID() == 0 ) {
1438                                 $wgContLang->findVariantLink($link, $nt);
1439                         }
1440
1441                         $ns = $nt->getNamespace();
1442                         $iw = $nt->getInterWiki();
1443
1444                         if ($might_be_img) { # if this is actually an invalid link
1445                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1446                                         $found = false;
1447                                         while (isset ($a[$k+1]) ) {
1448                                                 #look at the next 'line' to see if we can close it there
1449                                                 $spliced = array_splice( $a, $k + 1, 1 );
1450                                                 $next_line = array_shift( $spliced );
1451                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1452                                                 # the first ]] closes the inner link, the second the image
1453                                                         $found = true;
1454                                                         $text .= '[[' . $m[1];
1455                                                         $trail = $m[2];
1456                                                         break;
1457                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1458                                                         #if there's exactly one ]] that's fine, we'll keep looking
1459                                                         $text .= '[[' . $m[0];
1460                                                 } else {
1461                                                         #if $next_line is invalid too, we need look no further
1462                                                         $text .= '[[' . $next_line;
1463                                                         break;
1464                                                 }
1465                                         }
1466                                         if ( !$found ) {
1467                                                 # we couldn't find the end of this imageLink, so output it raw
1468                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1469                                                 $text = $this->replaceInternalLinks($text);
1470                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1471                                                 # note: no $trail, because without an end, there *is* no trail
1472                                                 continue;
1473                                         }
1474                                 } else { #it's not an image, so output it raw
1475                                         $s .= $prefix . '[[' . $link . '|' . $text;
1476                                         # note: no $trail, because without an end, there *is* no trail
1477                                         continue;
1478                                 }
1479                         }
1480
1481                         $wasblank = ( '' == $text );
1482                         if( $wasblank ) $text = $link;
1483
1484
1485                         # Link not escaped by : , create the various objects
1486                         if( $noforce ) {
1487
1488                                 # Interwikis
1489                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1490                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1491                                         $s = rtrim($s . "\n");
1492                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1493                                         continue;
1494                                 }
1495
1496                                 if ( $ns == NS_IMAGE ) {
1497                                         wfProfileIn( "$fname-image" );
1498                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1499                                                 # recursively parse links inside the image caption
1500                                                 # actually, this will parse them in any other parameters, too,
1501                                                 # but it might be hard to fix that, and it doesn't matter ATM
1502                                                 $text = $this->replaceExternalLinks($text);
1503                                                 $text = $this->replaceInternalLinks($text);
1504
1505                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1506                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1507                                                 $this->mOutput->addImage( $nt->getDBkey() );
1508
1509                                                 wfProfileOut( "$fname-image" );
1510                                                 continue;
1511                                         }
1512                                         wfProfileOut( "$fname-image" );
1513
1514                                 }
1515
1516                                 if ( $ns == NS_CATEGORY ) {
1517                                         wfProfileIn( "$fname-category" );
1518                                         $s = rtrim($s . "\n"); # bug 87
1519
1520                                         if ( $wasblank ) {
1521                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1522                                                         $sortkey = $this->mTitle->getText();
1523                                                 } else {
1524                                                         $sortkey = $this->mTitle->getPrefixedText();
1525                                                 }
1526                                         } else {
1527                                                 $sortkey = $text;
1528                                         }
1529                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1530                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1531                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1532
1533                                         /**
1534                                          * Strip the whitespace Category links produce, see bug 87
1535                                          * @todo We might want to use trim($tmp, "\n") here.
1536                                          */
1537                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1538
1539                                         wfProfileOut( "$fname-category" );
1540                                         continue;
1541                                 }
1542                         }
1543
1544                         if( ( $nt->getPrefixedText() === $selflink ) &&
1545                             ( $nt->getFragment() === '' ) ) {
1546                                 # Self-links are handled specially; generally de-link and change to bold.
1547                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1548                                 continue;
1549                         }
1550
1551                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1552                         if( $ns == NS_MEDIA ) {
1553                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1554                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1555                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1556                                 $this->mOutput->addImage( $nt->getDBkey() );
1557                                 continue;
1558                         } elseif( $ns == NS_SPECIAL ) {
1559                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1560                                 continue;
1561                         } elseif( $ns == NS_IMAGE ) {
1562                                 $img = Image::newFromTitle( $nt );
1563                                 if( $img->exists() ) {
1564                                         // Force a blue link if the file exists; may be a remote
1565                                         // upload on the shared repository, and we want to see its
1566                                         // auto-generated page.
1567                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1568                                         continue;
1569                                 }
1570                         }
1571                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1572                 }
1573                 wfProfileOut( $fname );
1574                 return $s;
1575         }
1576
1577         /**
1578          * Make a link placeholder. The text returned can be later resolved to a real link with
1579          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1580          * parsing of interwiki links, and secondly to allow all extistence checks and
1581          * article length checks (for stub links) to be bundled into a single query.
1582          *
1583          */
1584         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1585                 if ( ! is_object($nt) ) {
1586                         # Fail gracefully
1587                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1588                 } else {
1589                         # Separate the link trail from the rest of the link
1590                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1591
1592                         if ( $nt->isExternal() ) {
1593                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1594                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1595                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1596                         } else {
1597                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1598                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1599                                 $this->mLinkHolders['queries'][] = $query;
1600                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1601                                 $this->mLinkHolders['titles'][] = $nt;
1602
1603                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1604                         }
1605                 }
1606                 return $retVal;
1607         }
1608
1609         /**
1610          * Render a forced-blue link inline; protect against double expansion of
1611          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1612          * Since this little disaster has to split off the trail text to avoid
1613          * breaking URLs in the following text without breaking trails on the
1614          * wiki links, it's been made into a horrible function.
1615          *
1616          * @param Title $nt
1617          * @param string $text
1618          * @param string $query
1619          * @param string $trail
1620          * @param string $prefix
1621          * @return string HTML-wikitext mix oh yuck
1622          */
1623         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1624                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1625                 $sk =& $this->mOptions->getSkin();
1626                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1627                 return $this->armorLinks( $link ) . $trail;
1628         }
1629
1630         /**
1631          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1632          * going to go through further parsing steps before inline URL expansion.
1633          *
1634          * In particular this is important when using action=render, which causes
1635          * full URLs to be included.
1636          *
1637          * Oh man I hate our multi-layer parser!
1638          *
1639          * @param string more-or-less HTML
1640          * @return string less-or-more HTML with NOPARSE bits
1641          */
1642         function armorLinks( $text ) {
1643                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1644                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1645         }
1646
1647         /**
1648          * Return true if subpage links should be expanded on this page.
1649          * @return bool
1650          */
1651         function areSubpagesAllowed() {
1652                 # Some namespaces don't allow subpages
1653                 global $wgNamespacesWithSubpages;
1654                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1655         }
1656
1657         /**
1658          * Handle link to subpage if necessary
1659          * @param string $target the source of the link
1660          * @param string &$text the link text, modified as necessary
1661          * @return string the full name of the link
1662          * @private
1663          */
1664         function maybeDoSubpageLink($target, &$text) {
1665                 # Valid link forms:
1666                 # Foobar -- normal
1667                 # :Foobar -- override special treatment of prefix (images, language links)
1668                 # /Foobar -- convert to CurrentPage/Foobar
1669                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1670                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1671                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1672
1673                 $fname = 'Parser::maybeDoSubpageLink';
1674                 wfProfileIn( $fname );
1675                 $ret = $target; # default return value is no change
1676
1677                 # Some namespaces don't allow subpages,
1678                 # so only perform processing if subpages are allowed
1679                 if( $this->areSubpagesAllowed() ) {
1680                         # Look at the first character
1681                         if( $target != '' && $target{0} == '/' ) {
1682                                 # / at end means we don't want the slash to be shown
1683                                 if( substr( $target, -1, 1 ) == '/' ) {
1684                                         $target = substr( $target, 1, -1 );
1685                                         $noslash = $target;
1686                                 } else {
1687                                         $noslash = substr( $target, 1 );
1688                                 }
1689
1690                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1691                                 if( '' === $text ) {
1692                                         $text = $target;
1693                                 } # this might be changed for ugliness reasons
1694                         } else {
1695                                 # check for .. subpage backlinks
1696                                 $dotdotcount = 0;
1697                                 $nodotdot = $target;
1698                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1699                                         ++$dotdotcount;
1700                                         $nodotdot = substr( $nodotdot, 3 );
1701                                 }
1702                                 if($dotdotcount > 0) {
1703                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1704                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1705                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1706                                                 # / at the end means don't show full path
1707                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1708                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1709                                                         if( '' === $text ) {
1710                                                                 $text = $nodotdot;
1711                                                         }
1712                                                 }
1713                                                 $nodotdot = trim( $nodotdot );
1714                                                 if( $nodotdot != '' ) {
1715                                                         $ret .= '/' . $nodotdot;
1716                                                 }
1717                                         }
1718                                 }
1719                         }
1720                 }
1721
1722                 wfProfileOut( $fname );
1723                 return $ret;
1724         }
1725
1726         /**#@+
1727          * Used by doBlockLevels()
1728          * @private
1729          */
1730         /* private */ function closeParagraph() {
1731                 $result = '';
1732                 if ( '' != $this->mLastSection ) {
1733                         $result = '</' . $this->mLastSection  . ">\n";
1734                 }
1735                 $this->mInPre = false;
1736                 $this->mLastSection = '';
1737                 return $result;
1738         }
1739         # getCommon() returns the length of the longest common substring
1740         # of both arguments, starting at the beginning of both.
1741         #
1742         /* private */ function getCommon( $st1, $st2 ) {
1743                 $fl = strlen( $st1 );
1744                 $shorter = strlen( $st2 );
1745                 if ( $fl < $shorter ) { $shorter = $fl; }
1746
1747                 for ( $i = 0; $i < $shorter; ++$i ) {
1748                         if ( $st1{$i} != $st2{$i} ) { break; }
1749                 }
1750                 return $i;
1751         }
1752         # These next three functions open, continue, and close the list
1753         # element appropriate to the prefix character passed into them.
1754         #
1755         /* private */ function openList( $char ) {
1756                 $result = $this->closeParagraph();
1757
1758                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1759                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1760                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1761                 else if ( ';' == $char ) {
1762                         $result .= '<dl><dt>';
1763                         $this->mDTopen = true;
1764                 }
1765                 else { $result = '<!-- ERR 1 -->'; }
1766
1767                 return $result;
1768         }
1769
1770         /* private */ function nextItem( $char ) {
1771                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1772                 else if ( ':' == $char || ';' == $char ) {
1773                         $close = '</dd>';
1774                         if ( $this->mDTopen ) { $close = '</dt>'; }
1775                         if ( ';' == $char ) {
1776                                 $this->mDTopen = true;
1777                                 return $close . '<dt>';
1778                         } else {
1779                                 $this->mDTopen = false;
1780                                 return $close . '<dd>';
1781                         }
1782                 }
1783                 return '<!-- ERR 2 -->';
1784         }
1785
1786         /* private */ function closeList( $char ) {
1787                 if ( '*' == $char ) { $text = '</li></ul>'; }
1788                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1789                 else if ( ':' == $char ) {
1790                         if ( $this->mDTopen ) {
1791                                 $this->mDTopen = false;
1792                                 $text = '</dt></dl>';
1793                         } else {
1794                                 $text = '</dd></dl>';
1795                         }
1796                 }
1797                 else {  return '<!-- ERR 3 -->'; }
1798                 return $text."\n";
1799         }
1800         /**#@-*/
1801
1802         /**
1803          * Make lists from lines starting with ':', '*', '#', etc.
1804          *
1805          * @private
1806          * @return string the lists rendered as HTML
1807          */
1808         function doBlockLevels( $text, $linestart ) {
1809                 $fname = 'Parser::doBlockLevels';
1810                 wfProfileIn( $fname );
1811
1812                 # Parsing through the text line by line.  The main thing
1813                 # happening here is handling of block-level elements p, pre,
1814                 # and making lists from lines starting with * # : etc.
1815                 #
1816                 $textLines = explode( "\n", $text );
1817
1818                 $lastPrefix = $output = '';
1819                 $this->mDTopen = $inBlockElem = false;
1820                 $prefixLength = 0;
1821                 $paragraphStack = false;
1822
1823                 if ( !$linestart ) {
1824                         $output .= array_shift( $textLines );
1825                 }
1826                 foreach ( $textLines as $oLine ) {
1827                         $lastPrefixLength = strlen( $lastPrefix );
1828                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1829                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1830                         if ( !$this->mInPre ) {
1831                                 # Multiple prefixes may abut each other for nested lists.
1832                                 $prefixLength = strspn( $oLine, '*#:;' );
1833                                 $pref = substr( $oLine, 0, $prefixLength );
1834
1835                                 # eh?
1836                                 $pref2 = str_replace( ';', ':', $pref );
1837                                 $t = substr( $oLine, $prefixLength );
1838                                 $this->mInPre = !empty($preOpenMatch);
1839                         } else {
1840                                 # Don't interpret any other prefixes in preformatted text
1841                                 $prefixLength = 0;
1842                                 $pref = $pref2 = '';
1843                                 $t = $oLine;
1844                         }
1845
1846                         # List generation
1847                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1848                                 # Same as the last item, so no need to deal with nesting or opening stuff
1849                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1850                                 $paragraphStack = false;
1851
1852                                 if ( substr( $pref, -1 ) == ';') {
1853                                         # The one nasty exception: definition lists work like this:
1854                                         # ; title : definition text
1855                                         # So we check for : in the remainder text to split up the
1856                                         # title and definition, without b0rking links.
1857                                         $term = $t2 = '';
1858                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1859                                                 $t = $t2;
1860                                                 $output .= $term . $this->nextItem( ':' );
1861                                         }
1862                                 }
1863                         } elseif( $prefixLength || $lastPrefixLength ) {
1864                                 # Either open or close a level...
1865                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1866                                 $paragraphStack = false;
1867
1868                                 while( $commonPrefixLength < $lastPrefixLength ) {
1869                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1870                                         --$lastPrefixLength;
1871                                 }
1872                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1873                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1874                                 }
1875                                 while ( $prefixLength > $commonPrefixLength ) {
1876                                         $char = substr( $pref, $commonPrefixLength, 1 );
1877                                         $output .= $this->openList( $char );
1878
1879                                         if ( ';' == $char ) {
1880                                                 # FIXME: This is dupe of code above
1881                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1882                                                         $t = $t2;
1883                                                         $output .= $term . $this->nextItem( ':' );
1884                                                 }
1885                                         }
1886                                         ++$commonPrefixLength;
1887                                 }
1888                                 $lastPrefix = $pref2;
1889                         }
1890                         if( 0 == $prefixLength ) {
1891                                 wfProfileIn( "$fname-paragraph" );
1892                                 # No prefix (not in list)--go to paragraph mode
1893                                 // XXX: use a stack for nestable elements like span, table and div
1894                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/center|<\\/tr|<\\/td|<\\/th)/iS', $t );
1895                                 $closematch = preg_match(
1896                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1897                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<center)/iS', $t );
1898                                 if ( $openmatch or $closematch ) {
1899                                         $paragraphStack = false;
1900                                         # TODO bug 5718: paragraph closed
1901                                         $output .= $this->closeParagraph();
1902                                         if ( $preOpenMatch and !$preCloseMatch ) {
1903                                                 $this->mInPre = true;
1904                                         }
1905                                         if ( $closematch ) {
1906                                                 $inBlockElem = false;
1907                                         } else {
1908                                                 $inBlockElem = true;
1909                                         }
1910                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1911                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1912                                                 // pre
1913                                                 if ($this->mLastSection != 'pre') {
1914                                                         $paragraphStack = false;
1915                                                         $output .= $this->closeParagraph().'<pre>';
1916                                                         $this->mLastSection = 'pre';
1917                                                 }
1918                                                 $t = substr( $t, 1 );
1919                                         } else {
1920                                                 // paragraph
1921                                                 if ( '' == trim($t) ) {
1922                                                         if ( $paragraphStack ) {
1923                                                                 $output .= $paragraphStack.'<br />';
1924                                                                 $paragraphStack = false;
1925                                                                 $this->mLastSection = 'p';
1926                                                         } else {
1927                                                                 if ($this->mLastSection != 'p' ) {
1928                                                                         $output .= $this->closeParagraph();
1929                                                                         $this->mLastSection = '';
1930                                                                         $paragraphStack = '<p>';
1931                                                                 } else {
1932                                                                         $paragraphStack = '</p><p>';
1933                                                                 }
1934                                                         }
1935                                                 } else {
1936                                                         if ( $paragraphStack ) {
1937                                                                 $output .= $paragraphStack;
1938                                                                 $paragraphStack = false;
1939                                                                 $this->mLastSection = 'p';
1940                                                         } else if ($this->mLastSection != 'p') {
1941                                                                 $output .= $this->closeParagraph().'<p>';
1942                                                                 $this->mLastSection = 'p';
1943                                                         }
1944                                                 }
1945                                         }
1946                                 }
1947                                 wfProfileOut( "$fname-paragraph" );
1948                         }
1949                         // somewhere above we forget to get out of pre block (bug 785)
1950                         if($preCloseMatch && $this->mInPre) {
1951                                 $this->mInPre = false;
1952                         }
1953                         if ($paragraphStack === false) {
1954                                 $output .= $t."\n";
1955                         }
1956                 }
1957                 while ( $prefixLength ) {
1958                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1959                         --$prefixLength;
1960                 }
1961                 if ( '' != $this->mLastSection ) {
1962                         $output .= '</' . $this->mLastSection . '>';
1963                         $this->mLastSection = '';
1964                 }
1965
1966                 wfProfileOut( $fname );
1967                 return $output;
1968         }
1969
1970         /**
1971          * Split up a string on ':', ignoring any occurences inside tags
1972          * to prevent illegal overlapping.
1973          * @param string $str the string to split
1974          * @param string &$before set to everything before the ':'
1975          * @param string &$after set to everything after the ':'
1976          * return string the position of the ':', or false if none found
1977          */
1978         function findColonNoLinks($str, &$before, &$after) {
1979                 $fname = 'Parser::findColonNoLinks';
1980                 wfProfileIn( $fname );
1981
1982                 $pos = strpos( $str, ':' );
1983                 if( $pos === false ) {
1984                         // Nothing to find!
1985                         wfProfileOut( $fname );
1986                         return false;
1987                 }
1988
1989                 $lt = strpos( $str, '<' );
1990                 if( $lt === false || $lt > $pos ) {
1991                         // Easy; no tag nesting to worry about
1992                         $before = substr( $str, 0, $pos );
1993                         $after = substr( $str, $pos+1 );
1994                         wfProfileOut( $fname );
1995                         return $pos;
1996                 }
1997
1998                 // Ugly state machine to walk through avoiding tags.
1999                 $state = MW_COLON_STATE_TEXT;
2000                 $stack = 0;
2001                 $len = strlen( $str );
2002                 for( $i = 0; $i < $len; $i++ ) {
2003                         $c = $str{$i};
2004
2005                         switch( $state ) {
2006                         // (Using the number is a performance hack for common cases)
2007                         case 0: // MW_COLON_STATE_TEXT:
2008                                 switch( $c ) {
2009                                 case "<":
2010                                         // Could be either a <start> tag or an </end> tag
2011                                         $state = MW_COLON_STATE_TAGSTART;
2012                                         break;
2013                                 case ":":
2014                                         if( $stack == 0 ) {
2015                                                 // We found it!
2016                                                 $before = substr( $str, 0, $i );
2017                                                 $after = substr( $str, $i + 1 );
2018                                                 wfProfileOut( $fname );
2019                                                 return $i;
2020                                         }
2021                                         // Embedded in a tag; don't break it.
2022                                         break;
2023                                 default:
2024                                         // Skip ahead looking for something interesting
2025                                         $colon = strpos( $str, ':', $i );
2026                                         if( $colon === false ) {
2027                                                 // Nothing else interesting
2028                                                 wfProfileOut( $fname );
2029                                                 return false;
2030                                         }
2031                                         $lt = strpos( $str, '<', $i );
2032                                         if( $stack === 0 ) {
2033                                                 if( $lt === false || $colon < $lt ) {
2034                                                         // We found it!
2035                                                         $before = substr( $str, 0, $colon );
2036                                                         $after = substr( $str, $colon + 1 );
2037                                                         wfProfileOut( $fname );
2038                                                         return $i;
2039                                                 }
2040                                         }
2041                                         if( $lt === false ) {
2042                                                 // Nothing else interesting to find; abort!
2043                                                 // We're nested, but there's no close tags left. Abort!
2044                                                 break 2;
2045                                         }
2046                                         // Skip ahead to next tag start
2047                                         $i = $lt;
2048                                         $state = MW_COLON_STATE_TAGSTART;
2049                                 }
2050                                 break;
2051                         case 1: // MW_COLON_STATE_TAG:
2052                                 // In a <tag>
2053                                 switch( $c ) {
2054                                 case ">":
2055                                         $stack++;
2056                                         $state = MW_COLON_STATE_TEXT;
2057                                         break;
2058                                 case "/":
2059                                         // Slash may be followed by >?
2060                                         $state = MW_COLON_STATE_TAGSLASH;
2061                                         break;
2062                                 default:
2063                                         // ignore
2064                                 }
2065                                 break;
2066                         case 2: // MW_COLON_STATE_TAGSTART:
2067                                 switch( $c ) {
2068                                 case "/":
2069                                         $state = MW_COLON_STATE_CLOSETAG;
2070                                         break;
2071                                 case "!":
2072                                         $state = MW_COLON_STATE_COMMENT;
2073                                         break;
2074                                 case ">":
2075                                         // Illegal early close? This shouldn't happen D:
2076                                         $state = MW_COLON_STATE_TEXT;
2077                                         break;
2078                                 default:
2079                                         $state = MW_COLON_STATE_TAG;
2080                                 }
2081                                 break;
2082                         case 3: // MW_COLON_STATE_CLOSETAG:
2083                                 // In a </tag>
2084                                 if( $c == ">" ) {
2085                                         $stack--;
2086                                         if( $stack < 0 ) {
2087                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2088                                                 wfProfileOut( $fname );
2089                                                 return false;
2090                                         }
2091                                         $state = MW_COLON_STATE_TEXT;
2092                                 }
2093                                 break;
2094                         case MW_COLON_STATE_TAGSLASH:
2095                                 if( $c == ">" ) {
2096                                         // Yes, a self-closed tag <blah/>
2097                                         $state = MW_COLON_STATE_TEXT;
2098                                 } else {
2099                                         // Probably we're jumping the gun, and this is an attribute
2100                                         $state = MW_COLON_STATE_TAG;
2101                                 }
2102                                 break;
2103                         case 5: // MW_COLON_STATE_COMMENT:
2104                                 if( $c == "-" ) {
2105                                         $state = MW_COLON_STATE_COMMENTDASH;
2106                                 }
2107                                 break;
2108                         case MW_COLON_STATE_COMMENTDASH:
2109                                 if( $c == "-" ) {
2110                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2111                                 } else {
2112                                         $state = MW_COLON_STATE_COMMENT;
2113                                 }
2114                                 break;
2115                         case MW_COLON_STATE_COMMENTDASHDASH:
2116                                 if( $c == ">" ) {
2117                                         $state = MW_COLON_STATE_TEXT;
2118                                 } else {
2119                                         $state = MW_COLON_STATE_COMMENT;
2120                                 }
2121                                 break;
2122                         default:
2123                                 throw new MWException( "State machine error in $fname" );
2124                         }
2125                 }
2126                 if( $stack > 0 ) {
2127                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2128                         return false;
2129                 }
2130                 wfProfileOut( $fname );
2131                 return false;
2132         }
2133
2134         /**
2135          * Return value of a magic variable (like PAGENAME)
2136          *
2137          * @private
2138          */
2139         function getVariableValue( $index ) {
2140                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2141
2142                 /**
2143                  * Some of these require message or data lookups and can be
2144                  * expensive to check many times.
2145                  */
2146                 static $varCache = array();
2147                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2148                         if ( isset( $varCache[$index] ) )
2149                                 return $varCache[$index];
2150
2151                 $ts = time();
2152                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2153
2154                 switch ( $index ) {
2155                         case MAG_CURRENTMONTH:
2156                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2157                         case MAG_CURRENTMONTHNAME:
2158                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2159                         case MAG_CURRENTMONTHNAMEGEN:
2160                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2161                         case MAG_CURRENTMONTHABBREV:
2162                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2163                         case MAG_CURRENTDAY:
2164                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2165                         case MAG_CURRENTDAY2:
2166                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2167                         case MAG_PAGENAME:
2168                                 return $this->mTitle->getText();
2169                         case MAG_PAGENAMEE:
2170                                 return $this->mTitle->getPartialURL();
2171                         case MAG_FULLPAGENAME:
2172                                 return $this->mTitle->getPrefixedText();
2173                         case MAG_FULLPAGENAMEE:
2174                                 return $this->mTitle->getPrefixedURL();
2175                         case MAG_SUBPAGENAME:
2176                                 return $this->mTitle->getSubpageText();
2177                         case MAG_SUBPAGENAMEE:
2178                                 return $this->mTitle->getSubpageUrlForm();
2179                         case MAG_BASEPAGENAME:
2180                                 return $this->mTitle->getBaseText();
2181                         case MAG_BASEPAGENAMEE:
2182                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2183                         case MAG_TALKPAGENAME:
2184                                 if( $this->mTitle->canTalk() ) {
2185                                         $talkPage = $this->mTitle->getTalkPage();
2186                                         return $talkPage->getPrefixedText();
2187                                 } else {
2188                                         return '';
2189                                 }
2190                         case MAG_TALKPAGENAMEE:
2191                                 if( $this->mTitle->canTalk() ) {
2192                                         $talkPage = $this->mTitle->getTalkPage();
2193                                         return $talkPage->getPrefixedUrl();
2194                                 } else {
2195                                         return '';
2196                                 }
2197                         case MAG_SUBJECTPAGENAME:
2198                                 $subjPage = $this->mTitle->getSubjectPage();
2199                                 return $subjPage->getPrefixedText();
2200                         case MAG_SUBJECTPAGENAMEE:
2201                                 $subjPage = $this->mTitle->getSubjectPage();
2202                                 return $subjPage->getPrefixedUrl();
2203                         case MAG_REVISIONID:
2204                                 return $this->mRevisionId;
2205                         case MAG_NAMESPACE:
2206                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2207                         case MAG_NAMESPACEE:
2208                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2209                         case MAG_TALKSPACE:
2210                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2211                         case MAG_TALKSPACEE:
2212                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2213                         case MAG_SUBJECTSPACE:
2214                                 return $this->mTitle->getSubjectNsText();
2215                         case MAG_SUBJECTSPACEE:
2216                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2217                         case MAG_CURRENTDAYNAME:
2218                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2219                         case MAG_CURRENTYEAR:
2220                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2221                         case MAG_CURRENTTIME:
2222                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2223                         case MAG_CURRENTWEEK:
2224                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2225                                 // int to remove the padding
2226                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2227                         case MAG_CURRENTDOW:
2228                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2229                         case MAG_NUMBEROFARTICLES:
2230                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2231                         case MAG_NUMBEROFFILES:
2232                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2233                         case MAG_NUMBEROFUSERS:
2234                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfUsers() );
2235                         case MAG_NUMBEROFPAGES:
2236                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfPages() );
2237                         case MAG_CURRENTTIMESTAMP:
2238                                 return $varCache[$index] = wfTimestampNow();
2239                         case MAG_CURRENTVERSION:
2240                                 global $wgVersion;
2241                                 return $wgVersion;
2242                         case MAG_SITENAME:
2243                                 return $wgSitename;
2244                         case MAG_SERVER:
2245                                 return $wgServer;
2246                         case MAG_SERVERNAME:
2247                                 return $wgServerName;
2248                         case MAG_SCRIPTPATH:
2249                                 return $wgScriptPath;
2250                         case MAG_DIRECTIONMARK:
2251                                 return $wgContLang->getDirMark();
2252                         case MAG_CONTENTLANGUAGE:
2253                                 global $wgContLanguageCode;
2254                                 return $wgContLanguageCode;
2255                         default:
2256                                 $ret = null;
2257                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2258                                         return $ret;
2259                                 else
2260                                         return null;
2261                 }
2262         }
2263
2264         /**
2265          * initialise the magic variables (like CURRENTMONTHNAME)
2266          *
2267          * @private
2268          */
2269         function initialiseVariables() {
2270                 $fname = 'Parser::initialiseVariables';
2271                 wfProfileIn( $fname );
2272                 global $wgVariableIDs;
2273                 $this->mVariables = array();
2274                 foreach ( $wgVariableIDs as $id ) {
2275                         $mw =& MagicWord::get( $id );
2276                         $mw->addToArray( $this->mVariables, $id );
2277                 }
2278                 wfProfileOut( $fname );
2279         }
2280
2281         /**
2282          * parse any parentheses in format ((title|part|part))
2283          * and call callbacks to get a replacement text for any found piece
2284          *
2285          * @param string $text The text to parse
2286          * @param array $callbacks rules in form:
2287          *     '{' => array(                            # opening parentheses
2288          *                                      'end' => '}',   # closing parentheses
2289          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2290          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2291          *                                                                )
2292          *                                      )
2293          * @private
2294          */
2295         function replace_callback ($text, $callbacks) {
2296                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2297                 $lastOpeningBrace = -1;                 # last not closed parentheses
2298
2299                 for ($i = 0; $i < strlen($text); $i++) {
2300                         # check for any opening brace
2301                         $rule = null;
2302                         $nextPos = -1;
2303                         foreach ($callbacks as $key => $value) {
2304                                 $pos = strpos ($text, $key, $i);
2305                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2306                                         $rule = $value;
2307                                         $nextPos = $pos;
2308                                 }
2309                         }
2310
2311                         if ($lastOpeningBrace >= 0) {
2312                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2313
2314                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2315                                         $rule = null;
2316                                         $nextPos = $pos;
2317                                 }
2318
2319                                 $pos = strpos ($text, '|', $i);
2320
2321                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2322                                         $rule = null;
2323                                         $nextPos = $pos;
2324                                 }
2325                         }
2326
2327                         if ($nextPos == -1)
2328                                 break;
2329
2330                         $i = $nextPos;
2331
2332                         # found openning brace, lets add it to parentheses stack
2333                         if (null != $rule) {
2334                                 $piece = array('brace' => $text[$i],
2335                                                            'braceEnd' => $rule['end'],
2336                                                            'count' => 1,
2337                                                            'title' => '',
2338                                                            'parts' => null);
2339
2340                                 # count openning brace characters
2341                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2342                                         $piece['count']++;
2343                                         $i++;
2344                                 }
2345
2346                                 $piece['startAt'] = $i+1;
2347                                 $piece['partStart'] = $i+1;
2348
2349                                 # we need to add to stack only if openning brace count is enough for any given rule
2350                                 foreach ($rule['cb'] as $cnt => $fn) {
2351                                         if ($piece['count'] >= $cnt) {
2352                                                 $lastOpeningBrace ++;
2353                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2354                                                 break;
2355                                         }
2356                                 }
2357
2358                                 continue;
2359                         }
2360                         else if ($lastOpeningBrace >= 0) {
2361                                 # first check if it is a closing brace
2362                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2363                                         # lets check if it is enough characters for closing brace
2364                                         $count = 1;
2365                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2366                                                 $count++;
2367
2368                                         # if there are more closing parentheses than opening ones, we parse less
2369                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2370                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2371
2372                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2373                                         $matchingCount = 0;
2374                                         $matchingCallback = null;
2375                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2376                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2377                                                         $matchingCount = $cnt;
2378                                                         $matchingCallback = $fn;
2379                                                 }
2380                                         }
2381
2382                                         if ($matchingCount == 0) {
2383                                                 $i += $count - 1;
2384                                                 continue;
2385                                         }
2386
2387                                         # lets set a title or last part (if '|' was found)
2388                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2389                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2390                                         else
2391                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2392
2393                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2394                                         $pieceEnd = $i + $matchingCount;
2395
2396                                         if( is_callable( $matchingCallback ) ) {
2397                                                 $cbArgs = array (
2398                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2399                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2400                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2401                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2402                                                                                  );
2403                                                 # finally we can call a user callback and replace piece of text
2404                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2405                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2406                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2407                                         }
2408                                         else {
2409                                                 # null value for callback means that parentheses should be parsed, but not replaced
2410                                                 $i += $matchingCount - 1;
2411                                         }
2412
2413                                         # reset last openning parentheses, but keep it in case there are unused characters
2414                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2415                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2416                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2417                                                                    'title' => '',
2418                                                                    'parts' => null,
2419                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2420                                         $openingBraceStack[$lastOpeningBrace--] = null;
2421
2422                                         if ($matchingCount < $piece['count']) {
2423                                                 $piece['count'] -= $matchingCount;
2424                                                 $piece['startAt'] -= $matchingCount;
2425                                                 $piece['partStart'] = $piece['startAt'];
2426                                                 # do we still qualify for any callback with remaining count?
2427                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2428                                                         if ($piece['count'] >= $cnt) {
2429                                                                 $lastOpeningBrace ++;
2430                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2431                                                                 break;
2432                                                         }
2433                                                 }
2434                                         }
2435                                         continue;
2436                                 }
2437
2438                                 # lets set a title if it is a first separator, or next part otherwise
2439                                 if ($text[$i] == '|') {
2440                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2441                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2442                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2443                                         }
2444                                         else
2445                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2446
2447                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2448                                 }
2449                         }
2450                 }
2451
2452                 return $text;
2453         }
2454
2455         /**
2456          * Replace magic variables, templates, and template arguments
2457          * with the appropriate text. Templates are substituted recursively,
2458          * taking care to avoid infinite loops.
2459          *
2460          * Note that the substitution depends on value of $mOutputType:
2461          *  OT_WIKI: only {{subst:}} templates
2462          *  OT_MSG: only magic variables
2463          *  OT_HTML: all templates and magic variables
2464          *
2465          * @param string $tex The text to transform
2466          * @param array $args Key-value pairs representing template parameters to substitute
2467          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2468          * @private
2469          */
2470         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2471                 # Prevent too big inclusions
2472                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2473                         return $text;
2474                 }
2475
2476                 $fname = 'Parser::replaceVariables';
2477                 wfProfileIn( $fname );
2478
2479                 # This function is called recursively. To keep track of arguments we need a stack:
2480                 array_push( $this->mArgStack, $args );
2481
2482                 $braceCallbacks = array();
2483                 if ( !$argsOnly ) {
2484                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2485                 }
2486                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2487                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2488                 }
2489                 $callbacks = array();
2490                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2491                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2492                 $text = $this->replace_callback ($text, $callbacks);
2493
2494                 array_pop( $this->mArgStack );
2495
2496                 wfProfileOut( $fname );
2497                 return $text;
2498         }
2499
2500         /**
2501          * Replace magic variables
2502          * @private
2503          */
2504         function variableSubstitution( $matches ) {
2505                 $fname = 'Parser::variableSubstitution';
2506                 $varname = $matches[1];
2507                 wfProfileIn( $fname );
2508                 if ( !$this->mVariables ) {
2509                         $this->initialiseVariables();
2510                 }
2511                 $skip = false;
2512                 if ( $this->mOutputType == OT_WIKI ) {
2513                         # Do only magic variables prefixed by SUBST
2514                         $mwSubst =& MagicWord::get( MAG_SUBST );
2515                         if (!$mwSubst->matchStartAndRemove( $varname ))
2516                                 $skip = true;
2517                         # Note that if we don't substitute the variable below,
2518                         # we don't remove the {{subst:}} magic word, in case
2519                         # it is a template rather than a magic variable.
2520                 }
2521                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2522                         $id = $this->mVariables[$varname];
2523                         $text = $this->getVariableValue( $id );
2524                         $this->mOutput->mContainsOldMagic = true;
2525                 } else {
2526                         $text = $matches[0];
2527                 }
2528                 wfProfileOut( $fname );
2529                 return $text;
2530         }
2531
2532         # Split template arguments
2533         function getTemplateArgs( $argsString ) {
2534                 if ( $argsString === '' ) {
2535                         return array();
2536                 }
2537
2538                 $args = explode( '|', substr( $argsString, 1 ) );
2539
2540                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2541                 # merged with the next arg because the '|' character between belongs
2542                 # to the link syntax and not the template parameter syntax.
2543                 $argc = count($args);
2544
2545                 for ( $i = 0; $i < $argc-1; $i++ ) {
2546                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2547                                 $args[$i] .= '|'.$args[$i+1];
2548                                 array_splice($args, $i+1, 1);
2549                                 $i--;
2550                                 $argc--;
2551                         }
2552                 }
2553
2554                 return $args;
2555         }
2556
2557         /**
2558          * Return the text of a template, after recursively
2559          * replacing any variables or templates within the template.
2560          *
2561          * @param array $piece The parts of the template
2562          *  $piece['text']: matched text
2563          *  $piece['title']: the title, i.e. the part before the |
2564          *  $piece['parts']: the parameter array
2565          * @return string the text of the template
2566          * @private
2567          */
2568         function braceSubstitution( $piece ) {
2569                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $action;
2570                 $fname = 'Parser::braceSubstitution';
2571                 wfProfileIn( $fname );
2572
2573                 # Flags
2574                 $found = false;             # $text has been filled
2575                 $nowiki = false;            # wiki markup in $text should be escaped
2576                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2577                 $noargs = false;            # Don't replace triple-brace arguments in $text
2578                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2579                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2580                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2581
2582                 # Title object, where $text came from
2583                 $title = NULL;
2584
2585                 $linestart = '';
2586
2587                 # $part1 is the bit before the first |, and must contain only title characters
2588                 # $args is a list of arguments, starting from index 0, not including $part1
2589
2590                 $part1 = $piece['title'];
2591                 # If the third subpattern matched anything, it will start with |
2592
2593                 if (null == $piece['parts']) {
2594                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2595                         if ($replaceWith != $piece['text']) {
2596                                 $text = $replaceWith;
2597                                 $found = true;
2598                                 $noparse = true;
2599                                 $noargs = true;
2600                         }
2601                 }
2602
2603                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2604                 $argc = count( $args );
2605
2606                 # SUBST
2607                 if ( !$found ) {
2608                         $mwSubst =& MagicWord::get( MAG_SUBST );
2609                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2610                                 # One of two possibilities is true:
2611                                 # 1) Found SUBST but not in the PST phase
2612                                 # 2) Didn't find SUBST and in the PST phase
2613                                 # In either case, return without further processing
2614                                 $text = $piece['text'];
2615                                 $found = true;
2616                                 $noparse = true;
2617                                 $noargs = true;
2618                         }
2619                 }
2620
2621                 # MSG, MSGNW, INT and RAW
2622                 if ( !$found ) {
2623                         # Check for MSGNW:
2624                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2625                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2626                                 $nowiki = true;
2627                         } else {
2628                                 # Remove obsolete MSG:
2629                                 $mwMsg =& MagicWord::get( MAG_MSG );
2630                                 $mwMsg->matchStartAndRemove( $part1 );
2631                         }
2632
2633                         # Check for RAW:
2634                         $mwRaw =& MagicWord::get( MAG_RAW );
2635                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2636                                 $forceRawInterwiki = true;
2637                         }
2638
2639                         # Check if it is an internal message
2640                         $mwInt =& MagicWord::get( MAG_INT );
2641                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2642                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2643                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2644                                         $found = true;
2645                                 }
2646                         }
2647                 }
2648
2649                 # NS
2650                 if ( !$found ) {
2651                         # Check for NS: (namespace expansion)
2652                         $mwNs = MagicWord::get( MAG_NS );
2653                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2654                                 if ( intval( $part1 ) || $part1 == "0" ) {
2655                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2656                                         $found = true;
2657                                 } else {
2658                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2659                                         if ( !is_null( $index ) ) {
2660                                                 $text = $linestart . $wgContLang->getNsText( $index );
2661                                                 $found = true;
2662                                         }
2663                                 }
2664                         }
2665                 }
2666
2667                 # URLENCODE
2668                 if( !$found ) {
2669                         $urlencode =& MagicWord::get( MAG_URLENCODE );
2670                         if( $urlencode->matchStartAndRemove( $part1 ) ) {
2671                                 $text = $linestart . urlencode( $part1 );
2672                                 $found = true;
2673                         }
2674                 }
2675
2676                 # LCFIRST, UCFIRST, LC and UC
2677                 if ( !$found ) {
2678                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2679                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2680                         $lc =& MagicWord::get( MAG_LC );
2681                         $uc =& MagicWord::get( MAG_UC );
2682                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2683                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2684                                 $found = true;
2685                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2686                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2687                                 $found = true;
2688                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2689                                 $text = $linestart . $wgContLang->lc( $part1 );
2690                                 $found = true;
2691                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2692                                  $text = $linestart . $wgContLang->uc( $part1 );
2693                                  $found = true;
2694                         }
2695                 }
2696
2697                 # LOCALURL and FULLURL
2698                 if ( !$found ) {
2699                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2700                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2701                         $mwFull =& MagicWord::get( MAG_FULLURL );
2702                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2703
2704
2705                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2706                                 $func = 'getLocalURL';
2707                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2708                                 $func = 'escapeLocalURL';
2709                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2710                                 $func = 'getFullURL';
2711                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2712                                 $func = 'escapeFullURL';
2713                         } else {
2714                                 $func = false;
2715                         }
2716
2717                         if ( $func !== false ) {
2718                                 $title = Title::newFromText( $part1 );
2719                                 # Due to order of execution of a lot of bits, the values might be encoded
2720                                 # before arriving here; if that's true, then the title can't be created
2721                                 # and the variable will fail. If we can't get a decent title from the first
2722                                 # attempt, url-decode and try for a second.
2723                                 if( is_null( $title ) )
2724                                         $title = Title::newFromUrl( urldecode( $part1 ) );
2725                                 if ( !is_null( $title ) ) {
2726                                         if ( $argc > 0 ) {
2727                                                 $text = $linestart . $title->$func( $args[0] );
2728                                         } else {
2729                                                 $text = $linestart . $title->$func();
2730                                         }
2731                                         $found = true;
2732                                 }
2733                         }
2734                 }
2735
2736                 $lang = $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
2737                 # GRAMMAR
2738                 if ( !$found && $argc == 1 ) {
2739                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2740                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2741                                 $text = $linestart . $lang->convertGrammar( $args[0], $part1 );
2742                                 $found = true;
2743                         }
2744                 }
2745
2746                 # PLURAL
2747                 if ( !$found && $argc >= 2 ) {
2748                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2749                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2750                                 while ( count($args) < 5 ) { $args[] = $args[count($args)-1]; }
2751                                 $text = $linestart . $lang->convertPlural( $part1, $args[0], $args[1],
2752                                         $args[2], $args[3], $args[4]);
2753                                 $found = true;
2754                         }
2755                 }
2756
2757                 # DISPLAYTITLE
2758                 if ( !$found && $argc == 1 && $wgAllowDisplayTitle ) {
2759                         $mwDT =& MagicWord::get( MAG_DISPLAYTITLE );
2760                         if ( $mwDT->matchStartAndRemove( $part1 ) ) {
2761
2762                                 # Set title in parser output object
2763                                 $param = $args[0];
2764                                 $parserOptions = new ParserOptions;
2765                                 $local_parser = new Parser ();
2766                                 $t2 = $local_parser->parse ( $param, $this->mTitle, $parserOptions, false );
2767                                 $this->mOutput->mHTMLtitle = $t2->GetText();
2768
2769                                 # Add subtitle
2770                                 $t = $this->mTitle->getPrefixedText();
2771                                 $this->mOutput->mSubtitle .= wfMsg('displaytitle', $t);
2772                                 $text = "" ;
2773                                 $found = true ;
2774                         }
2775                 }
2776
2777                 # NUMBEROFPAGES, NUMBEROFUSERS, NUMBEROFARTICLES, and NUMBEROFFILES
2778                 if( !$found ) {
2779                         $mwWordsToCheck = array( MAG_NUMBEROFPAGES => 'wfNumberOfPages',
2780                                                                          MAG_NUMBEROFUSERS => 'wfNumberOfUsers',
2781                                                                          MAG_NUMBEROFARTICLES => 'wfNumberOfArticles',
2782                                                                          MAG_NUMBEROFFILES => 'wfNumberOfFiles' );
2783                         foreach( $mwWordsToCheck as $word => $func ) {
2784                                 $mwCurrentWord =& MagicWord::get( $word );
2785                                 if( $mwCurrentWord->matchStartAndRemove( $part1 ) ) {
2786                                         $mwRawSuffix =& MagicWord::get( MAG_RAWSUFFIX );
2787                                         if( $mwRawSuffix->match( $args[0] ) ) {
2788                                                 # Raw and unformatted
2789                                                 $text = $linestart . call_user_func( $func );
2790                                         } else {
2791                                                 # Formatted according to the content default
2792                                                 $text = $linestart . $wgContLang->formatNum( call_user_func( $func ) );
2793                                         }
2794                                         $found = true;
2795                                 }
2796                         }
2797                 }
2798
2799                 # #LANGUAGE:
2800                 if( !$found ) {
2801                         $mwLanguage =& MagicWord::get( MAG_LANGUAGE );
2802                         if( $mwLanguage->matchStartAndRemove( $part1 ) ) {
2803                                 $lang = $wgContLang->getLanguageName( strtolower( $part1 ) );
2804                                 $text = $linestart . ( $lang != '' ? $lang : $part1 );
2805                                 $found = true;
2806                         }
2807                 }
2808
2809                 # Extensions
2810                 if ( !$found && substr( $part1, 0, 1 ) == '#' ) {
2811                         $colonPos = strpos( $part1, ':' );
2812                         if ( $colonPos !== false ) {
2813                                 $function = strtolower( substr( $part1, 1, $colonPos - 1 ) );
2814                                 if ( isset( $this->mFunctionHooks[$function] ) ) {
2815                                         $funcArgs = array_map( 'trim', $args );
2816                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2817                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2818                                         $found = true;
2819
2820                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2821                                         //$noargs = true;
2822                                         //$noparse = true;
2823
2824                                         if ( is_array( $result ) ) {
2825                                                 $text = $linestart . $result[0];
2826                                                 unset( $result[0] );
2827
2828                                                 // Extract flags into the local scope
2829                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2830                                                 extract( $result );
2831                                         } else {
2832                                                 $text = $linestart . $result;
2833                                         }
2834                                 }
2835                         }
2836                 }
2837
2838                 # Template table test
2839
2840                 # Did we encounter this template already? If yes, it is in the cache
2841                 # and we need to check for loops.
2842                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2843                         $found = true;
2844
2845                         # Infinite loop test
2846                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2847                                 $noparse = true;
2848                                 $noargs = true;
2849                                 $found = true;
2850                                 $text = $linestart .
2851                                         '{{' . $part1 . '}}' .
2852                                         '<!-- WARNING: template loop detected -->';
2853                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2854                         } else {
2855                                 # set $text to cached message.
2856                                 $text = $linestart . $this->mTemplates[$piece['title']];
2857                         }
2858                 }
2859
2860                 # Load from database
2861                 $lastPathLevel = $this->mTemplatePath;
2862                 if ( !$found ) {
2863                         $ns = NS_TEMPLATE;
2864                         # declaring $subpage directly in the function call
2865                         # does not work correctly with references and breaks
2866                         # {{/subpage}}-style inclusions
2867                         $subpage = '';
2868                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2869                         if ($subpage !== '') {
2870                                 $ns = $this->mTitle->getNamespace();
2871                         }
2872                         $title = Title::newFromText( $part1, $ns );
2873
2874                         if ( !is_null( $title ) ) {
2875                                 if ( !$title->isExternal() ) {
2876                                         # Check for excessive inclusion
2877                                         $dbk = $title->getPrefixedDBkey();
2878                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2879                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->mOutputType != OT_WIKI ) {
2880                                                         $text = SpecialPage::capturePath( $title );
2881                                                         if ( is_string( $text ) ) {
2882                                                                 $found = true;
2883                                                                 $noparse = true;
2884                                                                 $noargs = true;
2885                                                                 $isHTML = true;
2886                                                                 $this->disableCache();
2887                                                         }
2888                                                 } else {
2889                                                         $articleContent = $this->fetchTemplate( $title );
2890                                                         if ( $articleContent !== false ) {
2891                                                                 $found = true;
2892                                                                 $text = $articleContent;
2893                                                                 $replaceHeadings = true;
2894                                                         }
2895                                                 }
2896                                         }
2897
2898                                         # If the title is valid but undisplayable, make a link to it
2899                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2900                                                 $text = '[['.$title->getPrefixedText().']]';
2901                                                 $found = true;
2902                                         }
2903                                 } elseif ( $title->isTrans() ) {
2904                                         // Interwiki transclusion
2905                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2906                                                 $text = $this->interwikiTransclude( $title, 'render' );
2907                                                 $isHTML = true;
2908                                                 $noparse = true;
2909                                         } else {
2910                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2911                                                 $replaceHeadings = true;
2912                                         }
2913                                         $found = true;
2914                                 }
2915
2916                                 # Template cache array insertion
2917                                 # Use the original $piece['title'] not the mangled $part1, so that
2918                                 # modifiers such as RAW: produce separate cache entries
2919                                 if( $found ) {
2920                                         if( $isHTML ) {
2921                                                 // A special page; don't store it in the template cache.
2922                                         } else {
2923                                                 $this->mTemplates[$piece['title']] = $text;
2924                                         }
2925                                         $text = $linestart . $text;
2926                                 }
2927                         }
2928                 }
2929
2930                 # Recursive parsing, escaping and link table handling
2931                 # Only for HTML output
2932                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2933                         $text = wfEscapeWikiText( $text );
2934                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2935                         if ( $noargs ) {
2936                                 $assocArgs = array();
2937                         } else {
2938                                 # Clean up argument array
2939                                 $assocArgs = array();
2940                                 $index = 1;
2941                                 foreach( $args as $arg ) {
2942                                         $eqpos = strpos( $arg, '=' );
2943                                         if ( $eqpos === false ) {
2944                                                 $assocArgs[$index++] = $arg;
2945                                         } else {
2946                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2947                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2948                                                 if ( $value === false ) {
2949                                                         $value = '';
2950                                                 }
2951                                                 if ( $name !== false ) {
2952                                                         $assocArgs[$name] = $value;
2953                                                 }
2954                                         }
2955                                 }
2956
2957                                 # Add a new element to the templace recursion path
2958                                 $this->mTemplatePath[$part1] = 1;
2959                         }
2960
2961                         if ( !$noparse ) {
2962                                 # If there are any <onlyinclude> tags, only include them
2963                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2964                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2965                                         $text = '';
2966                                         foreach ($m[1] as $piece)
2967                                                 $text .= $piece;
2968                                 }
2969                                 # Remove <noinclude> sections and <includeonly> tags
2970                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2971                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2972
2973                                 if( $this->mOutputType == OT_HTML ) {
2974                                         # Strip <nowiki>, <pre>, etc.
2975                                         $text = $this->strip( $text, $this->mStripState );
2976                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2977                                 }
2978                                 $text = $this->replaceVariables( $text, $assocArgs );
2979
2980                                 # If the template begins with a table or block-level
2981                                 # element, it should be treated as beginning a new line.
2982                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2983                                         $text = "\n" . $text;
2984                                 }
2985                         } elseif ( !$noargs ) {
2986                                 # $noparse and !$noargs
2987                                 # Just replace the arguments, not any double-brace items
2988                                 # This is used for rendered interwiki transclusion
2989                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2990                         }
2991                 }
2992                 # Prune lower levels off the recursion check path
2993                 $this->mTemplatePath = $lastPathLevel;
2994
2995                 if ( !$found ) {
2996                         wfProfileOut( $fname );
2997                         return $piece['text'];
2998                 } else {
2999                         if ( $isHTML ) {
3000                                 # Replace raw HTML by a placeholder
3001                                 # Add a blank line preceding, to prevent it from mucking up
3002                                 # immediately preceding headings
3003                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3004                         } else {
3005                                 # replace ==section headers==
3006                                 # XXX this needs to go away once we have a better parser.
3007                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
3008                                         if( !is_null( $title ) )
3009                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3010                                         else
3011                                                 $encodedname = base64_encode("");
3012                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3013                                                 PREG_SPLIT_DELIM_CAPTURE);
3014                                         $text = '';
3015                                         $nsec = 0;
3016                                         for( $i = 0; $i < count($m); $i += 2 ) {
3017                                                 $text .= $m[$i];
3018                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3019                                                 $hl = $m[$i + 1];
3020                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3021                                                         $text .= $hl;
3022                                                         continue;
3023                                                 }
3024                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3025                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3026                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3027
3028                                                 $nsec++;
3029                                         }
3030                                 }
3031                         }
3032                 }
3033
3034                 # Prune lower levels off the recursion check path
3035                 $this->mTemplatePath = $lastPathLevel;
3036
3037                 if ( !$found ) {
3038                         wfProfileOut( $fname );
3039                         return $piece['text'];
3040                 } else {
3041                         wfProfileOut( $fname );
3042                         return $text;
3043                 }
3044         }
3045
3046         /**
3047          * Fetch the unparsed text of a template and register a reference to it.
3048          */
3049         function fetchTemplate( $title ) {
3050                 $text = false;
3051                 // Loop to fetch the article, with up to 1 redirect
3052                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3053                         $rev = Revision::newFromTitle( $title );
3054                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3055                         if ( !$rev ) {
3056                                 break;
3057                         }
3058                         $text = $rev->getText();
3059                         if ( $text === false ) {
3060                                 break;
3061                         }
3062                         // Redirect?
3063                         $title = Title::newFromRedirect( $text );
3064                 }
3065                 return $text;
3066         }
3067
3068         /**
3069          * Transclude an interwiki link.
3070          */
3071         function interwikiTransclude( $title, $action ) {
3072                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
3073
3074                 if (!$wgEnableScaryTranscluding)
3075                         return wfMsg('scarytranscludedisabled');
3076
3077                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
3078                 // But we'll handle it generally anyway
3079                 if ( $title->getNamespace() ) {
3080                         // Use the canonical namespace, which should work anywhere
3081                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
3082                 } else {
3083                         $articleName = $title->getDBkey();
3084                 }
3085
3086                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
3087                 $url .= "?action=$action";
3088                 if (strlen($url) > 255)
3089                         return wfMsg('scarytranscludetoolong');
3090                 return $this->fetchScaryTemplateMaybeFromCache($url);
3091         }
3092
3093         function fetchScaryTemplateMaybeFromCache($url) {
3094                 global $wgTranscludeCacheExpiry;
3095                 $dbr =& wfGetDB(DB_SLAVE);
3096                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3097                                 array('tc_url' => $url));
3098                 if ($obj) {
3099                         $time = $obj->tc_time;
3100                         $text = $obj->tc_contents;
3101                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3102                                 return $text;
3103                         }
3104                 }
3105
3106                 $text = wfGetHTTP($url);
3107                 if (!$text)
3108                         return wfMsg('scarytranscludefailed', $url);
3109
3110                 $dbw =& wfGetDB(DB_MASTER);
3111                 $dbw->replace('transcache', array('tc_url'), array(
3112                         'tc_url' => $url,
3113                         'tc_time' => time(),
3114                         'tc_contents' => $text));
3115                 return $text;
3116         }
3117
3118
3119         /**
3120          * Triple brace replacement -- used for template arguments
3121          * @private
3122          */
3123         function argSubstitution( $matches ) {
3124                 $arg = trim( $matches['title'] );
3125                 $text = $matches['text'];
3126                 $inputArgs = end( $this->mArgStack );
3127
3128                 if ( array_key_exists( $arg, $inputArgs ) ) {
3129                         $text = $inputArgs[$arg];
3130                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
3131                         $text = $matches['parts'][0];
3132                 }
3133
3134                 return $text;
3135         }
3136
3137         /**
3138          * Returns true if the function is allowed to include this entity
3139          * @private
3140          */
3141         function incrementIncludeCount( $dbk ) {
3142                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
3143                         $this->mIncludeCount[$dbk] = 0;
3144                 }
3145                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
3146                         return true;
3147                 } else {
3148                         return false;
3149                 }
3150         }
3151
3152         /**
3153          * Detect __TOC__ magic word and set a placeholder
3154          */
3155         function stripToc( $text ) {
3156                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3157                 # do not add TOC
3158                 $mw = MagicWord::get( MAG_NOTOC );
3159                 if( $mw->matchAndRemove( $text ) ) {
3160                         $this->mShowToc = false;
3161                 }
3162
3163                 $mw = MagicWord::get( MAG_TOC );
3164                 if( $mw->match( $text ) ) {
3165                         $this->mShowToc = true;
3166                         $this->mForceTocPosition = true;
3167
3168                         // Set a placeholder. At the end we'll fill it in with the TOC.
3169                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3170
3171                         // Only keep the first one.
3172                         $text = $mw->replace( '', $text );
3173                 }
3174                 return $text;
3175         }
3176
3177         /**
3178          * This function accomplishes several tasks:
3179          * 1) Auto-number headings if that option is enabled
3180          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3181          * 3) Add a Table of contents on the top for users who have enabled the option
3182          * 4) Auto-anchor headings
3183          *
3184          * It loops through all headlines, collects the necessary data, then splits up the
3185          * string and re-inserts the newly formatted headlines.
3186          *
3187          * @param string $text
3188          * @param boolean $isMain
3189          * @private
3190          */
3191         function formatHeadings( $text, $isMain=true ) {
3192                 global $wgMaxTocLevel, $wgContLang;
3193
3194                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3195                 if( !$this->mTitle->userCanEdit() ) {
3196                         $showEditLink = 0;
3197                 } else {
3198                         $showEditLink = $this->mOptions->getEditSection();
3199                 }
3200
3201                 # Inhibit editsection links if requested in the page
3202                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
3203                 if( $esw->matchAndRemove( $text ) ) {
3204                         $showEditLink = 0;
3205                 }
3206
3207                 # Get all headlines for numbering them and adding funky stuff like [edit]
3208                 # links - this is for later, but we need the number of headlines right now
3209                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3210
3211                 # if there are fewer than 4 headlines in the article, do not show TOC
3212                 # unless it's been explicitly enabled.
3213                 $enoughToc = $this->mShowToc &&
3214                         (($numMatches >= 4) || $this->mForceTocPosition);
3215
3216                 # Allow user to stipulate that a page should have a "new section"
3217                 # link added via __NEWSECTIONLINK__
3218                 $mw =& MagicWord::get( MAG_NEWSECTIONLINK );
3219                 if( $mw->matchAndRemove( $text ) )
3220                         $this->mOutput->setNewSection( true );
3221
3222                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3223                 # override above conditions and always show TOC above first header
3224                 $mw =& MagicWord::get( MAG_FORCETOC );
3225                 if ($mw->matchAndRemove( $text ) ) {
3226                         $this->mShowToc = true;
3227                         $enoughToc = true;
3228                 }
3229
3230                 # Never ever show TOC if no headers
3231                 if( $numMatches < 1 ) {
3232                         $enoughToc = false;
3233                 }
3234
3235                 # We need this to perform operations on the HTML
3236                 $sk =& $this->mOptions->getSkin();
3237
3238                 # headline counter
3239                 $headlineCount = 0;
3240                 $sectionCount = 0; # headlineCount excluding template sections
3241
3242                 # Ugh .. the TOC should have neat indentation levels which can be
3243                 # passed to the skin functions. These are determined here
3244                 $toc = '';
3245                 $full = '';
3246                 $head = array();
3247                 $sublevelCount = array();
3248                 $levelCount = array();
3249                 $toclevel = 0;
3250                 $level = 0;
3251                 $prevlevel = 0;
3252                 $toclevel = 0;
3253                 $prevtoclevel = 0;
3254
3255                 foreach( $matches[3] as $headline ) {
3256                         $istemplate = 0;
3257                         $templatetitle = '';
3258                         $templatesection = 0;
3259                         $numbering = '';
3260
3261                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3262                                 $istemplate = 1;
3263                                 $templatetitle = base64_decode($mat[1]);
3264                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3265                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3266                         }
3267
3268                         if( $toclevel ) {
3269                                 $prevlevel = $level;
3270                                 $prevtoclevel = $toclevel;
3271                         }
3272                         $level = $matches[1][$headlineCount];
3273
3274                         if( $doNumberHeadings || $enoughToc ) {
3275
3276                                 if ( $level > $prevlevel ) {
3277                                         # Increase TOC level
3278                                         $toclevel++;
3279                                         $sublevelCount[$toclevel] = 0;
3280                                         if( $toclevel<$wgMaxTocLevel ) {
3281                                                 $toc .= $sk->tocIndent();
3282                                         }
3283                                 }
3284                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3285                                         # Decrease TOC level, find level to jump to
3286
3287                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3288                                                 # Can only go down to level 1
3289                                                 $toclevel = 1;
3290                                         } else {
3291                                                 for ($i = $toclevel; $i > 0; $i--) {
3292                                                         if ( $levelCount[$i] == $level ) {
3293                                                                 # Found last matching level
3294                                                                 $toclevel = $i;
3295                                                                 break;
3296                                                         }
3297                                                         elseif ( $levelCount[$i] < $level ) {
3298                                                                 # Found first matching level below current level
3299                                                                 $toclevel = $i + 1;
3300                                                                 break;
3301                                                         }
3302                                                 }
3303                                         }
3304                                         if( $toclevel<$wgMaxTocLevel ) {
3305                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3306                                         }
3307                                 }
3308                                 else {
3309                                         # No change in level, end TOC line
3310                                         if( $toclevel<$wgMaxTocLevel ) {
3311                                                 $toc .= $sk->tocLineEnd();
3312                                         }
3313                                 }
3314
3315                                 $levelCount[$toclevel] = $level;
3316
3317                                 # count number of headlines for each level
3318                                 @$sublevelCount[$toclevel]++;
3319                                 $dot = 0;
3320                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3321                                         if( !empty( $sublevelCount[$i] ) ) {
3322                                                 if( $dot ) {
3323                                                         $numbering .= '.';
3324                                                 }
3325                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3326                                                 $dot = 1;
3327                                         }
3328                                 }
3329                         }
3330
3331                         # The canonized header is a version of the header text safe to use for links
3332                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3333                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3334                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3335
3336                         # Remove link placeholders by the link text.
3337                         #     <!--LINK number-->
3338                         # turns into
3339                         #     link text with suffix
3340                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3341                                                             "\$this->mLinkHolders['texts'][\$1]",
3342                                                             $canonized_headline );
3343                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3344                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3345                                                             $canonized_headline );
3346
3347                         # strip out HTML
3348                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3349                         $tocline = trim( $canonized_headline );
3350                         # Save headline for section edit hint before it's escaped
3351                         $headline_hint = trim( $canonized_headline );
3352                         $canonized_headline = Sanitizer::escapeId( $tocline );
3353                         $refers[$headlineCount] = $canonized_headline;
3354
3355                         # count how many in assoc. array so we can track dupes in anchors
3356                         @$refers[$canonized_headline]++;
3357                         $refcount[$headlineCount]=$refers[$canonized_headline];
3358
3359                         # Don't number the heading if it is the only one (looks silly)
3360                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3361                                 # the two are different if the line contains a link
3362                                 $headline=$numbering . ' ' . $headline;
3363                         }
3364
3365                         # Create the anchor for linking from the TOC to the section
3366                         $anchor = $canonized_headline;
3367                         if($refcount[$headlineCount] > 1 ) {
3368                                 $anchor .= '_' . $refcount[$headlineCount];
3369                         }
3370                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3371                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3372                         }
3373                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3374                                 if ( empty( $head[$headlineCount] ) ) {
3375                                         $head[$headlineCount] = '';
3376                                 }
3377                                 if( $istemplate )
3378                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3379                                 else
3380                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3381                         }
3382
3383                         # give headline the correct <h#> tag
3384                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3385
3386                         $headlineCount++;
3387                         if( !$istemplate )
3388                                 $sectionCount++;
3389                 }
3390
3391                 if( $enoughToc ) {
3392                         if( $toclevel<$wgMaxTocLevel ) {
3393                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3394                         }
3395                         $toc = $sk->tocList( $toc );
3396                 }
3397
3398                 # split up and insert constructed headlines
3399
3400                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3401                 $i = 0;
3402
3403                 foreach( $blocks as $block ) {
3404                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3405                                 # This is the [edit] link that appears for the top block of text when
3406                                 # section editing is enabled
3407
3408                                 # Disabled because it broke block formatting
3409                                 # For example, a bullet point in the top line
3410                                 # $full .= $sk->editSectionLink(0);
3411                         }
3412                         $full .= $block;
3413                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3414                                 # Top anchor now in skin
3415                                 $full = $full.$toc;
3416                         }
3417
3418                         if( !empty( $head[$i] ) ) {
3419                                 $full .= $head[$i];
3420                         }
3421                         $i++;
3422                 }
3423                 if( $this->mForceTocPosition ) {
3424                         return str_replace( '<!--MWTOC-->', $toc, $full );
3425                 } else {
3426                         return $full;
3427                 }
3428         }
3429
3430         /**
3431          * Return an HTML link for the "ISBN 123456" text
3432          * @private
3433          */
3434         function magicISBN( $text ) {
3435                 $fname = 'Parser::magicISBN';
3436                 wfProfileIn( $fname );
3437
3438                 $a = split( 'ISBN ', ' '.$text );
3439                 if ( count ( $a ) < 2 ) {
3440                         wfProfileOut( $fname );
3441                         return $text;
3442                 }
3443                 $text = substr( array_shift( $a ), 1);
3444                 $valid = '0123456789-Xx';
3445
3446                 foreach ( $a as $x ) {
3447                         # hack: don't replace inside thumbnail title/alt
3448                         # attributes
3449                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3450                                 $text .= "ISBN $x";
3451                                 continue;
3452                         }
3453
3454                         $isbn = $blank = '' ;
3455                         while ( ' ' == $x{0} ) {
3456                                 $blank .= ' ';
3457                                 $x = substr( $x, 1 );
3458                         }
3459                         if ( $x == '' ) { # blank isbn
3460                                 $text .= "ISBN $blank";
3461                                 continue;
3462                         }
3463                         while ( strstr( $valid, $x{0} ) != false ) {
3464                                 $isbn .= $x{0};
3465                                 $x = substr( $x, 1 );
3466                         }
3467                         $num = str_replace( '-', '', $isbn );
3468                         $num = str_replace( ' ', '', $num );
3469                         $num = str_replace( 'x', 'X', $num );
3470
3471                         if ( '' == $num ) {
3472                                 $text .= "ISBN $blank$x";
3473                         } else {
3474                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3475                                 $text .= '<a href="' .
3476                                         $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3477                                         "\" class=\"internal\">ISBN $isbn</a>";
3478                                 $text .= $x;
3479                         }
3480                 }
3481                 wfProfileOut( $fname );
3482                 return $text;
3483         }
3484
3485         /**
3486          * Return an HTML link for the "RFC 1234" text
3487          *
3488          * @private
3489          * @param string $text     Text to be processed
3490          * @param string $keyword  Magic keyword to use (default RFC)
3491          * @param string $urlmsg   Interface message to use (default rfcurl)
3492          * @return string
3493          */
3494         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3495
3496                 $valid = '0123456789';
3497                 $internal = false;
3498
3499                 $a = split( $keyword, ' '.$text );
3500                 if ( count ( $a ) < 2 ) {
3501                         return $text;
3502                 }
3503                 $text = substr( array_shift( $a ), 1);
3504
3505                 /* Check if keyword is preceed by [[.
3506                  * This test is made here cause of the array_shift above
3507                  * that prevent the test to be done in the foreach.
3508                  */
3509                 if ( substr( $text, -2 ) == '[[' ) {
3510                         $internal = true;
3511                 }
3512
3513                 foreach ( $a as $x ) {
3514                         /* token might be empty if we have RFC RFC 1234 */
3515                         if ( $x=='' ) {
3516                                 $text.=$keyword;
3517                                 continue;
3518                                 }
3519
3520                         # hack: don't replace inside thumbnail title/alt
3521                         # attributes
3522                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3523                                 $text .= $keyword . $x;
3524                                 continue;
3525                         }
3526
3527                         $id = $blank = '' ;
3528
3529                         /** remove and save whitespaces in $blank */
3530                         while ( $x{0} == ' ' ) {
3531                                 $blank .= ' ';
3532                                 $x = substr( $x, 1 );
3533                         }
3534
3535                         /** remove and save the rfc number in $id */
3536                         while ( strstr( $valid, $x{0} ) != false ) {
3537                                 $id .= $x{0};
3538                                 $x = substr( $x, 1 );
3539                         }
3540
3541                         if ( $id == '' ) {
3542                                 /* call back stripped spaces*/
3543                                 $text .= $keyword.$blank.$x;
3544                         } elseif( $internal ) {
3545                                 /* normal link */
3546                                 $text .= $keyword.$id.$x;
3547                         } else {
3548                                 /* build the external link*/
3549                                 $url = wfMsg( $urlmsg, $id);
3550                                 $sk =& $this->mOptions->getSkin();
3551                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3552                                 $text .= "<a href=\"{$url}\"{$la}>{$keyword}{$id}</a>{$x}";
3553                         }
3554
3555                         /* Check if the next RFC keyword is preceed by [[ */
3556                         $internal = ( substr($x,-2) == '[[' );
3557                 }
3558                 return $text;
3559         }
3560
3561         /**
3562          * Transform wiki markup when saving a page by doing \r\n -> \n
3563          * conversion, substitting signatures, {{subst:}} templates, etc.
3564          *
3565          * @param string $text the text to transform
3566          * @param Title &$title the Title object for the current article
3567          * @param User &$user the User object describing the current user
3568          * @param ParserOptions $options parsing options
3569          * @param bool $clearState whether to clear the parser state first
3570          * @return string the altered wiki markup
3571          * @public
3572          */
3573         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3574                 $this->mOptions = $options;
3575                 $this->mTitle =& $title;
3576                 $this->mOutputType = OT_WIKI;
3577
3578                 if ( $clearState ) {
3579                         $this->clearState();
3580                 }
3581
3582                 $stripState = false;
3583                 $pairs = array(
3584                         "\r\n" => "\n",
3585                 );
3586                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3587                 $text = $this->strip( $text, $stripState, true );
3588                 $text = $this->pstPass2( $text, $stripState, $user );
3589                 $text = $this->unstrip( $text, $stripState );
3590                 $text = $this->unstripNoWiki( $text, $stripState );
3591                 return $text;
3592         }
3593
3594         /**
3595          * Pre-save transform helper function
3596          * @private
3597          */
3598         function pstPass2( $text, &$stripState, &$user ) {
3599                 global $wgContLang, $wgLocaltimezone;
3600
3601                 /* Note: This is the timestamp saved as hardcoded wikitext to
3602                  * the database, we use $wgContLang here in order to give
3603                  * everyone the same signature and use the default one rather
3604                  * than the one selected in each user's preferences.
3605                  */
3606                 if ( isset( $wgLocaltimezone ) ) {
3607                         $oldtz = getenv( 'TZ' );
3608                         putenv( 'TZ='.$wgLocaltimezone );
3609                 }
3610                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3611                   ' (' . date( 'T' ) . ')';
3612                 if ( isset( $wgLocaltimezone ) ) {
3613                         putenv( 'TZ='.$oldtz );
3614                 }
3615
3616                 # Variable replacement
3617                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3618                 $text = $this->replaceVariables( $text );
3619
3620                 # Strip out <nowiki> etc. added via replaceVariables
3621                 $text = $this->strip( $text, $stripState );
3622
3623                 # Signatures
3624                 $sigText = $this->getUserSig( $user );
3625                 $text = strtr( $text, array(
3626                         '~~~~~' => $d,
3627                         '~~~~' => "$sigText $d",
3628                         '~~~' => $sigText
3629                 ) );
3630
3631                 # Context links: [[|name]] and [[name (context)|]]
3632                 #
3633                 global $wgLegalTitleChars;
3634                 $tc = "[$wgLegalTitleChars]";
3635                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3636
3637                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3638                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3639
3640                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3641                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3642                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3643                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3644                 $context = '';
3645                 $t = $this->mTitle->getText();
3646                 if ( preg_match( $conpat, $t, $m ) ) {
3647                         $context = $m[2];
3648                 }
3649                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3650                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3651                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3652
3653                 if ( '' == $context ) {
3654                         $text = preg_replace( $p2, '[[\\1]]', $text );
3655                 } else {
3656                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3657                 }
3658
3659                 # Trim trailing whitespace
3660                 # MAG_END (__END__) tag allows for trailing
3661                 # whitespace to be deliberately included
3662                 $text = rtrim( $text );
3663                 $mw =& MagicWord::get( MAG_END );
3664                 $mw->matchAndRemove( $text );
3665
3666                 return $text;
3667         }
3668
3669         /**
3670          * Fetch the user's signature text, if any, and normalize to
3671          * validated, ready-to-insert wikitext.
3672          *
3673          * @param User $user
3674          * @return string
3675          * @private
3676          */
3677         function getUserSig( &$user ) {
3678                 $username = $user->getName();
3679                 $nickname = $user->getOption( 'nickname' );
3680                 $nickname = $nickname === '' ? $username : $nickname;
3681
3682                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3683                         # Sig. might contain markup; validate this
3684                         if( $this->validateSig( $nickname ) !== false ) {
3685                                 # Validated; clean up (if needed) and return it
3686                                 return $this->cleanSig( $nickname, true );
3687                         } else {
3688                                 # Failed to validate; fall back to the default
3689                                 $nickname = $username;
3690                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3691                         }
3692                 }
3693
3694                 # If we're still here, make it a link to the user page
3695                 $userpage = $user->getUserPage();
3696                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3697         }
3698
3699         /**
3700          * Check that the user's signature contains no bad XML
3701          *
3702          * @param string $text
3703          * @return mixed An expanded string, or false if invalid.
3704          */
3705         function validateSig( $text ) {
3706                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3707         }
3708
3709         /**
3710          * Clean up signature text
3711          *
3712          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3713          * 2) Substitute all transclusions
3714          *
3715          * @param string $text
3716          * @param $parsing Whether we're cleaning (preferences save) or parsing
3717          * @return string Signature text
3718          */
3719         function cleanSig( $text, $parsing = false ) {
3720                 global $wgTitle;
3721                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3722
3723                 $substWord = MagicWord::get( MAG_SUBST );
3724                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3725                 $substText = '{{' . $substWord->getSynonym( 0 );
3726
3727                 $text = preg_replace( $substRegex, $substText, $text );
3728                 $text = preg_replace( '/~{3,5}/', '', $text );
3729                 $text = $this->replaceVariables( $text );
3730
3731                 $this->clearState();
3732                 return $text;
3733         }
3734
3735         /**
3736          * Set up some variables which are usually set up in parse()
3737          * so that an external function can call some class members with confidence
3738          * @public
3739          */
3740         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3741                 $this->mTitle =& $title;
3742                 $this->mOptions = $options;
3743                 $this->mOutputType = $outputType;
3744                 if ( $clearState ) {
3745                         $this->clearState();
3746                 }
3747         }
3748
3749         /**
3750          * Transform a MediaWiki message by replacing magic variables.
3751          *
3752          * @param string $text the text to transform
3753          * @param ParserOptions $options  options
3754          * @return string the text with variables substituted
3755          * @public
3756          */
3757         function transformMsg( $text, $options ) {
3758                 global $wgTitle;
3759                 static $executing = false;
3760
3761                 $fname = "Parser::transformMsg";
3762
3763                 # Guard against infinite recursion
3764                 if ( $executing ) {
3765                         return $text;
3766                 }
3767                 $executing = true;
3768
3769                 wfProfileIn($fname);
3770
3771                 $this->mTitle = $wgTitle;
3772                 $this->mOptions = $options;
3773                 $this->mOutputType = OT_MSG;
3774                 $this->clearState();
3775                 $text = $this->replaceVariables( $text );
3776
3777                 $executing = false;
3778                 wfProfileOut($fname);
3779                 return $text;
3780         }
3781
3782         /**
3783          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3784          * The callback should have the following form:
3785          *    function myParserHook( $text, $params, &$parser ) { ... }
3786          *
3787          * Transform and return $text. Use $parser for any required context, e.g. use
3788          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3789          *
3790          * @public
3791          *
3792          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3793          * @param mixed $callback The callback function (and object) to use for the tag
3794          *
3795          * @return The old value of the mTagHooks array associated with the hook
3796          */
3797         function setHook( $tag, $callback ) {
3798                 $tag = strtolower( $tag );
3799                 $oldVal = @$this->mTagHooks[$tag];
3800                 $this->mTagHooks[$tag] = $callback;
3801
3802                 return $oldVal;
3803         }
3804
3805         /**
3806          * Create a function, e.g. {{sum:1|2|3}}
3807          * The callback function should have the form:
3808          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3809          *
3810          * The callback may either return the text result of the function, or an array with the text
3811          * in element 0, and a number of flags in the other elements. The names of the flags are
3812          * specified in the keys. Valid flags are:
3813          *   found                     The text returned is valid, stop processing the template. This
3814          *                             is on by default.
3815          *   nowiki                    Wiki markup in the return value should be escaped
3816          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3817          *   noargs                    Don't replace triple-brace arguments in the return value
3818          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3819          *
3820          * @public
3821          *
3822          * @param string $name The function name. Function names are case-insensitive.
3823          * @param mixed $callback The callback function (and object) to use
3824          *
3825          * @return The old callback function for this name, if any
3826          */
3827         function setFunctionHook( $name, $callback ) {
3828                 $name = strtolower( $name );
3829                 $oldVal = @$this->mFunctionHooks[$name];
3830                 $this->mFunctionHooks[$name] = $callback;
3831                 return $oldVal;
3832         }
3833
3834         /**
3835          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3836          * Placeholders created in Skin::makeLinkObj()
3837          * Returns an array of links found, indexed by PDBK:
3838          *  0 - broken
3839          *  1 - normal link
3840          *  2 - stub
3841          * $options is a bit field, RLH_FOR_UPDATE to select for update
3842          */
3843         function replaceLinkHolders( &$text, $options = 0 ) {
3844                 global $wgUser;
3845                 global $wgOutputReplace;
3846
3847                 $fname = 'Parser::replaceLinkHolders';
3848                 wfProfileIn( $fname );
3849
3850                 $pdbks = array();
3851                 $colours = array();
3852                 $sk =& $this->mOptions->getSkin();
3853                 $linkCache =& LinkCache::singleton();
3854
3855                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3856                         wfProfileIn( $fname.'-check' );
3857                         $dbr =& wfGetDB( DB_SLAVE );
3858                         $page = $dbr->tableName( 'page' );
3859                         $threshold = $wgUser->getOption('stubthreshold');
3860
3861                         # Sort by namespace
3862                         asort( $this->mLinkHolders['namespaces'] );
3863
3864                         # Generate query
3865                         $query = false;
3866                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3867                                 # Make title object
3868                                 $title = $this->mLinkHolders['titles'][$key];
3869
3870                                 # Skip invalid entries.
3871                                 # Result will be ugly, but prevents crash.
3872                                 if ( is_null( $title ) ) {
3873                                         continue;
3874                                 }
3875                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3876
3877                                 # Check if it's a static known link, e.g. interwiki
3878                                 if ( $title->isAlwaysKnown() ) {
3879                                         $colours[$pdbk] = 1;
3880                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3881                                         $colours[$pdbk] = 1;
3882                                         $this->mOutput->addLink( $title, $id );
3883                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3884                                         $colours[$pdbk] = 0;
3885                                 } else {
3886                                         # Not in the link cache, add it to the query
3887                                         if ( !isset( $current ) ) {
3888                                                 $current = $ns;
3889                                                 $query =  "SELECT page_id, page_namespace, page_title";
3890                                                 if ( $threshold > 0 ) {
3891                                                         $query .= ', page_len, page_is_redirect';
3892                                                 }
3893                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3894                                         } elseif ( $current != $ns ) {
3895                                                 $current = $ns;
3896                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3897                                         } else {
3898                                                 $query .= ', ';
3899                                         }
3900
3901                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3902                                 }
3903                         }
3904                         if ( $query ) {
3905                                 $query .= '))';
3906                                 if ( $options & RLH_FOR_UPDATE ) {
3907                                         $query .= ' FOR UPDATE';
3908                                 }
3909
3910                                 $res = $dbr->query( $query, $fname );
3911
3912                                 # Fetch data and form into an associative array
3913                                 # non-existent = broken
3914                                 # 1 = known
3915                                 # 2 = stub
3916                                 while ( $s = $dbr->fetchObject($res) ) {
3917                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3918                                         $pdbk = $title->getPrefixedDBkey();
3919                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3920                                         $this->mOutput->addLink( $title, $s->page_id );
3921
3922                                         if ( $threshold >  0 ) {
3923                                                 $size = $s->page_len;
3924                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3925                                                         $colours[$pdbk] = 1;
3926                                                 } else {
3927                                                         $colours[$pdbk] = 2;
3928                                                 }
3929                                         } else {
3930                                                 $colours[$pdbk] = 1;
3931                                         }
3932                                 }
3933                         }
3934                         wfProfileOut( $fname.'-check' );
3935
3936                         # Construct search and replace arrays
3937                         wfProfileIn( $fname.'-construct' );
3938                         $wgOutputReplace = array();
3939                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3940                                 $pdbk = $pdbks[$key];
3941                                 $searchkey = "<!--LINK $key-->";
3942                                 $title = $this->mLinkHolders['titles'][$key];
3943                                 if ( empty( $colours[$pdbk] ) ) {
3944                                         $linkCache->addBadLinkObj( $title );
3945                                         $colours[$pdbk] = 0;
3946                                         $this->mOutput->addLink( $title, 0 );
3947                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3948                                                                         $this->mLinkHolders['texts'][$key],
3949                                                                         $this->mLinkHolders['queries'][$key] );
3950                                 } elseif ( $colours[$pdbk] == 1 ) {
3951                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3952                                                                         $this->mLinkHolders['texts'][$key],
3953                                                                         $this->mLinkHolders['queries'][$key] );
3954                                 } elseif ( $colours[$pdbk] == 2 ) {
3955                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3956                                                                         $this->mLinkHolders['texts'][$key],
3957                                                                         $this->mLinkHolders['queries'][$key] );
3958                                 }
3959                         }
3960                         wfProfileOut( $fname.'-construct' );
3961
3962                         # Do the thing
3963                         wfProfileIn( $fname.'-replace' );
3964
3965                         $text = preg_replace_callback(
3966                                 '/(<!--LINK .*?-->)/',
3967                                 "wfOutputReplaceMatches",
3968                                 $text);
3969
3970                         wfProfileOut( $fname.'-replace' );
3971                 }
3972
3973                 # Now process interwiki link holders
3974                 # This is quite a bit simpler than internal links
3975                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3976                         wfProfileIn( $fname.'-interwiki' );
3977                         # Make interwiki link HTML
3978                         $wgOutputReplace = array();
3979                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3980                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3981                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3982                         }
3983
3984                         $text = preg_replace_callback(
3985                                 '/<!--IWLINK (.*?)-->/',
3986                                 "wfOutputReplaceMatches",
3987                                 $text );
3988                         wfProfileOut( $fname.'-interwiki' );
3989                 }
3990
3991                 wfProfileOut( $fname );
3992                 return $colours;
3993         }
3994
3995         /**
3996          * Replace <!--LINK--> link placeholders with plain text of links
3997          * (not HTML-formatted).
3998          * @param string $text
3999          * @return string
4000          */
4001         function replaceLinkHoldersText( $text ) {
4002                 $fname = 'Parser::replaceLinkHoldersText';
4003                 wfProfileIn( $fname );
4004
4005                 $text = preg_replace_callback(
4006                         '/<!--(LINK|IWLINK) (.*?)-->/',
4007                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4008                         $text );
4009
4010                 wfProfileOut( $fname );
4011                 return $text;
4012         }
4013
4014         /**
4015          * @param array $matches
4016          * @return string
4017          * @private
4018          */
4019         function replaceLinkHoldersTextCallback( $matches ) {
4020                 $type = $matches[1];
4021                 $key  = $matches[2];
4022                 if( $type == 'LINK' ) {
4023                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4024                                 return $this->mLinkHolders['texts'][$key];
4025                         }
4026                 } elseif( $type == 'IWLINK' ) {
4027                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4028                                 return $this->mInterwikiLinkHolders['texts'][$key];
4029                         }
4030                 }
4031                 return $matches[0];
4032         }
4033
4034         /**
4035          * Tag hook handler for 'pre'.
4036          */
4037         function renderPreTag( $text, $attribs, $parser ) {
4038                 // Backwards-compatibility hack
4039                 $content = preg_replace( '!<nowiki>(.*?)</nowiki>!is', '\\1', $text );
4040
4041                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4042                 return wfOpenElement( 'pre', $attribs ) .
4043                         wfEscapeHTMLTagsOnly( $content ) .
4044                         '</pre>';
4045         }
4046
4047         /**
4048          * Renders an image gallery from a text with one line per image.
4049          * text labels may be given by using |-style alternative text. E.g.
4050          *   Image:one.jpg|The number "1"
4051          *   Image:tree.jpg|A tree
4052          * given as text will return the HTML of a gallery with two images,
4053          * labeled 'The number "1"' and
4054          * 'A tree'.
4055          */
4056         function renderImageGallery( $text ) {
4057                 $ig = new ImageGallery();
4058                 $ig->setShowBytes( false );
4059                 $ig->setShowFilename( false );
4060                 $ig->setParsing();
4061                 $lines = explode( "\n", $text );
4062
4063                 foreach ( $lines as $line ) {
4064                         # match lines like these:
4065                         # Image:someimage.jpg|This is some image
4066                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4067                         # Skip empty lines
4068                         if ( count( $matches ) == 0 ) {
4069                                 continue;
4070                         }
4071                         $nt =& Title::newFromText( $matches[1] );
4072                         if( is_null( $nt ) ) {
4073                                 # Bogus title. Ignore these so we don't bomb out later.
4074                                 continue;
4075                         }
4076                         if ( isset( $matches[3] ) ) {
4077                                 $label = $matches[3];
4078                         } else {
4079                                 $label = '';
4080                         }
4081
4082                         $pout = $this->parse( $label,
4083                                 $this->mTitle,
4084                                 $this->mOptions,
4085                                 false, // Strip whitespace...?
4086                                 false  // Don't clear state!
4087                         );
4088                         $html = $pout->getText();
4089
4090                         $ig->add( new Image( $nt ), $html );
4091
4092                         # Only add real images (bug #5586)
4093                         if ( $nt->getNamespace() == NS_IMAGE ) {
4094                                 $this->mOutput->addImage( $nt->getDBkey() );
4095                         }
4096                 }
4097                 return $ig->toHTML();
4098         }
4099
4100         /**
4101          * Parse image options text and use it to make an image
4102          */
4103         function makeImage( &$nt, $options ) {
4104                 global $wgUseImageResize;
4105
4106                 $align = '';
4107
4108                 # Check if the options text is of the form "options|alt text"
4109                 # Options are:
4110                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4111                 #  * left               no resizing, just left align. label is used for alt= only
4112                 #  * right              same, but right aligned
4113                 #  * none               same, but not aligned
4114                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4115                 #  * center             center the image
4116                 #  * framed             Keep original image size, no magnify-button.
4117
4118                 $part = explode( '|', $options);
4119
4120                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
4121                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
4122                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
4123                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
4124                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
4125                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
4126                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
4127                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
4128                 $caption = '';
4129
4130                 $width = $height = $framed = $thumb = false;
4131                 $manual_thumb = '' ;
4132
4133                 foreach( $part as $key => $val ) {
4134                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4135                                 $thumb=true;
4136                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4137                                 # use manually specified thumbnail
4138                                 $thumb=true;
4139                                 $manual_thumb = $match;
4140                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
4141                                 # remember to set an alignment, don't render immediately
4142                                 $align = 'right';
4143                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
4144                                 # remember to set an alignment, don't render immediately
4145                                 $align = 'left';
4146                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
4147                                 # remember to set an alignment, don't render immediately
4148                                 $align = 'center';
4149                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
4150                                 # remember to set an alignment, don't render immediately
4151                                 $align = 'none';
4152                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4153                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
4154                                 # $match is the image width in pixels
4155                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4156                                         $width = intval( $m[1] );
4157                                         $height = intval( $m[2] );
4158                                 } else {
4159                                         $width = intval($match);
4160                                 }
4161                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4162                                 $framed=true;
4163                         } else {
4164                                 $caption = $val;
4165                         }
4166                 }
4167                 # Strip bad stuff out of the alt text
4168                 $alt = $this->replaceLinkHoldersText( $caption );
4169
4170                 # make sure there are no placeholders in thumbnail attributes
4171                 # that are later expanded to html- so expand them now and
4172                 # remove the tags
4173                 $alt = $this->unstrip($alt, $this->mStripState);
4174                 $alt = Sanitizer::stripAllTags( $alt );
4175
4176                 # Linker does the rest
4177                 $sk =& $this->mOptions->getSkin();
4178                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
4179         }
4180
4181         /**
4182          * Set a flag in the output object indicating that the content is dynamic and
4183          * shouldn't be cached.
4184          */
4185         function disableCache() {
4186                 wfDebug( "Parser output marked as uncacheable.\n" );
4187                 $this->mOutput->mCacheTime = -1;
4188         }
4189
4190         /**#@+
4191          * Callback from the Sanitizer for expanding items found in HTML attribute
4192          * values, so they can be safely tested and escaped.
4193          * @param string $text
4194          * @param array $args
4195          * @return string
4196          * @private
4197          */
4198         function attributeStripCallback( &$text, $args ) {
4199                 $text = $this->replaceVariables( $text, $args );
4200                 $text = $this->unstripForHTML( $text );
4201                 return $text;
4202         }
4203
4204         function unstripForHTML( $text ) {
4205                 $text = $this->unstrip( $text, $this->mStripState );
4206                 $text = $this->unstripNoWiki( $text, $this->mStripState );
4207                 return $text;
4208         }
4209         /**#@-*/
4210
4211         /**#@+
4212          * Accessor/mutator
4213          */
4214         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4215         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4216         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4217         /**#@-*/
4218
4219         /**#@+
4220          * Accessor
4221          */
4222         function getTags() { return array_keys( $this->mTagHooks ); }
4223         /**#@-*/
4224
4225
4226         /**
4227          * Break wikitext input into sections, and either pull or replace
4228          * some particular section's text.
4229          *
4230          * External callers should use the getSection and replaceSection methods.
4231          *
4232          * @param $text Page wikitext
4233          * @param $section Numbered section. 0 pulls the text before the first
4234          *                 heading; other numbers will pull the given section
4235          *                 along with its lower-level subsections.
4236          * @param $mode One of "get" or "replace"
4237          * @param $newtext Replacement text for section data.
4238          * @return string for "get", the extracted section text.
4239          *                for "replace", the whole page with the section replaced.
4240          */
4241         private function extractSections( $text, $section, $mode, $newtext='' ) {
4242                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4243                 # comments to be stripped as well)
4244                 $striparray = array();
4245
4246                 $oldOutputType = $this->mOutputType;
4247                 $oldOptions = $this->mOptions;
4248                 $this->mOptions = new ParserOptions();
4249                 $this->mOutputType = OT_WIKI;
4250
4251                 $striptext = $this->strip( $text, $striparray, true );
4252
4253                 $this->mOutputType = $oldOutputType;
4254                 $this->mOptions = $oldOptions;
4255
4256                 # now that we can be sure that no pseudo-sections are in the source,
4257                 # split it up by section
4258                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4259                 $comment = "(?:$uniq-!--.*?QINU)";
4260                 $secs = preg_split(
4261                 /*
4262                         "/
4263                         ^(
4264                         (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4265                         (?:
4266                                 (=+) # Should this be limited to 6?
4267                                 .+?  # Section title...
4268                                 \\2  # Ending = count must match start
4269                         |
4270                                 ^
4271                                 <h([1-6])\b.*?>
4272                                 .*?
4273                                 <\/h\\3\s*>
4274                         )
4275                         (?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
4276                         )$
4277                         /mix",
4278                 */
4279                         "/
4280                         (
4281                                 ^
4282                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4283                                 (=+) # Should this be limited to 6?
4284                                 .+?  # Section title...
4285                                 \\2  # Ending = count must match start
4286                                 (?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
4287                                 $
4288                         |
4289                                 <h([1-6])\b.*?>
4290                                 .*?
4291                                 <\/h\\3\s*>
4292                         )
4293                         /mix",
4294                         $striptext, -1,
4295                         PREG_SPLIT_DELIM_CAPTURE);
4296
4297                 if( $mode == "get" ) {
4298                         if( $section == 0 ) {
4299                                 // "Section 0" returns the content before any other section.
4300                                 $rv = $secs[0];
4301                         } else {
4302                                 $rv = "";
4303                         }
4304                 } elseif( $mode == "replace" ) {
4305                         if( $section == 0 ) {
4306                                 $rv = $newtext . "\n\n";
4307                                 $remainder = true;
4308                         } else {
4309                                 $rv = $secs[0];
4310                                 $remainder = false;
4311                         }
4312                 }
4313                 $count = 0;
4314                 $sectionLevel = 0;
4315                 for( $index = 1; $index < count( $secs ); ) {
4316                         $headerLine = $secs[$index++];
4317                         if( $secs[$index] ) {
4318                                 // A wiki header
4319                                 $headerLevel = strlen( $secs[$index++] );
4320                         } else {
4321                                 // An HTML header
4322                                 $index++;
4323                                 $headerLevel = intval( $secs[$index++] );
4324                         }
4325                         $content = $secs[$index++];
4326
4327                         $count++;
4328                         if( $mode == "get" ) {
4329                                 if( $count == $section ) {
4330                                         $rv = $headerLine . $content;
4331                                         $sectionLevel = $headerLevel;
4332                                 } elseif( $count > $section ) {
4333                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4334                                                 $rv .= $headerLine . $content;
4335                                         } else {
4336                                                 // Broke out to a higher-level section
4337                                                 break;
4338                                         }
4339                                 }
4340                         } elseif( $mode == "replace" ) {
4341                                 if( $count < $section ) {
4342                                         $rv .= $headerLine . $content;
4343                                 } elseif( $count == $section ) {
4344                                         $rv .= $newtext . "\n\n";
4345                                         $sectionLevel = $headerLevel;
4346                                 } elseif( $count > $section ) {
4347                                         if( $headerLevel <= $sectionLevel ) {
4348                                                 // Passed the section's sub-parts.
4349                                                 $remainder = true;
4350                                         }
4351                                         if( $remainder ) {
4352                                                 $rv .= $headerLine . $content;
4353                                         }
4354                                 }
4355                         }
4356                 }
4357                 # reinsert stripped tags
4358                 $rv = $this->unstrip( $rv, $striparray );
4359                 $rv = $this->unstripNoWiki( $rv, $striparray );
4360                 $rv = trim( $rv );
4361                 return $rv;
4362         }
4363
4364         /**
4365          * This function returns the text of a section, specified by a number ($section).
4366          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4367          * the first section before any such heading (section 0).
4368          *
4369          * If a section contains subsections, these are also returned.
4370          *
4371          * @param $text String: text to look in
4372          * @param $section Integer: section number
4373          * @return string text of the requested section
4374          */
4375         function getSection( $text, $section ) {
4376                 return $this->extractSections( $text, $section, "get" );
4377         }
4378
4379         function replaceSection( $oldtext, $section, $text ) {
4380                 return $this->extractSections( $oldtext, $section, "replace", $text );
4381         }
4382
4383 }
4384
4385 /**
4386  * @todo document
4387  * @package MediaWiki
4388  */
4389 class ParserOutput
4390 {
4391         var $mText,             # The output text
4392                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4393                 $mCategories,       # Map of category names to sort keys
4394                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4395                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4396                 $mVersion,          # Compatibility check
4397                 $mTitleText,        # title text of the chosen language variant
4398                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4399                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4400                 $mImages,           # DB keys of the images used, in the array key only
4401                 $mExternalLinks,    # External link URLs, in the key only
4402                 $mHTMLtitle,            # Display HTML title
4403                 $mSubtitle,                     # Additional subtitle
4404                 $mNewSection;           # Show a new section link?
4405
4406         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4407                 $containsOldMagic = false, $titletext = '' )
4408         {
4409                 $this->mText = $text;
4410                 $this->mLanguageLinks = $languageLinks;
4411                 $this->mCategories = $categoryLinks;
4412                 $this->mContainsOldMagic = $containsOldMagic;
4413                 $this->mCacheTime = '';
4414                 $this->mVersion = MW_PARSER_VERSION;
4415                 $this->mTitleText = $titletext;
4416                 $this->mLinks = array();
4417                 $this->mTemplates = array();
4418                 $this->mImages = array();
4419                 $this->mExternalLinks = array();
4420                 $this->mHTMLtitle = "" ;
4421                 $this->mSubtitle = "" ;
4422                 $this->mNewSection = false;
4423         }
4424
4425         function getText()                   { return $this->mText; }
4426         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4427         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4428         function &getCategories()            { return $this->mCategories; }
4429         function getCacheTime()              { return $this->mCacheTime; }
4430         function getTitleText()              { return $this->mTitleText; }
4431         function &getLinks()                 { return $this->mLinks; }
4432         function &getTemplates()             { return $this->mTemplates; }
4433         function &getImages()                { return $this->mImages; }
4434         function &getExternalLinks()         { return $this->mExternalLinks; }
4435
4436         function containsOldMagic()          { return $this->mContainsOldMagic; }
4437         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4438         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4439         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4440         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4441         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4442         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
4443
4444         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4445         function addImage( $name )           { $this->mImages[$name] = 1; }
4446         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4447         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4448
4449         function setNewSection( $value ) {
4450                 $this->mNewSection = (bool)$value;
4451         }
4452         function getNewSection() {
4453                 return (bool)$this->mNewSection;
4454         }
4455
4456         function addLink( $title, $id ) {
4457                 $ns = $title->getNamespace();
4458                 $dbk = $title->getDBkey();
4459                 if ( !isset( $this->mLinks[$ns] ) ) {
4460                         $this->mLinks[$ns] = array();
4461                 }
4462                 $this->mLinks[$ns][$dbk] = $id;
4463         }
4464
4465         function addTemplate( $title, $id ) {
4466                 $ns = $title->getNamespace();
4467                 $dbk = $title->getDBkey();
4468                 if ( !isset( $this->mTemplates[$ns] ) ) {
4469                         $this->mTemplates[$ns] = array();
4470                 }
4471                 $this->mTemplates[$ns][$dbk] = $id;
4472         }
4473
4474         /**
4475          * Return true if this cached output object predates the global or
4476          * per-article cache invalidation timestamps, or if it comes from
4477          * an incompatible older version.
4478          *
4479          * @param string $touched the affected article's last touched timestamp
4480          * @return bool
4481          * @public
4482          */
4483         function expired( $touched ) {
4484                 global $wgCacheEpoch;
4485                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4486                        $this->getCacheTime() < $touched ||
4487                        $this->getCacheTime() <= $wgCacheEpoch ||
4488                        !isset( $this->mVersion ) ||
4489                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4490         }
4491 }
4492
4493 /**
4494  * Set options of the Parser
4495  * @todo document
4496  * @package MediaWiki
4497  */
4498 class ParserOptions
4499 {
4500         # All variables are private
4501         var $mUseTeX;                    # Use texvc to expand <math> tags
4502         var $mUseDynamicDates;           # Use DateFormatter to format dates
4503         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
4504         var $mAllowExternalImages;       # Allow external images inline
4505         var $mAllowExternalImagesFrom;   # If not, any exception?
4506         var $mSkin;                      # Reference to the preferred skin
4507         var $mDateFormat;                # Date format index
4508         var $mEditSection;               # Create "edit section" links
4509         var $mNumberHeadings;            # Automatically number headings
4510         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
4511         var $mTidy;                      # Ask for tidy cleanup
4512         var $mInterfaceMessage;          # Which lang to call for PLURAL and GRAMMAR
4513
4514         function getUseTeX()                        { return $this->mUseTeX; }
4515         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4516         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4517         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4518         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4519         function &getSkin()                         { return $this->mSkin; }
4520         function getDateFormat()                    { return $this->mDateFormat; }
4521         function getEditSection()                   { return $this->mEditSection; }
4522         function getNumberHeadings()                { return $this->mNumberHeadings; }
4523         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4524         function getTidy()                          { return $this->mTidy; }
4525         function getInterfaceMessage()              { return $this->mInterfaceMessage; }
4526
4527         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4528         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4529         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4530         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4531         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4532         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4533         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4534         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4535         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4536         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4537         function setSkin( &$x ) { $this->mSkin =& $x; }
4538         function setInterfaceMessage( $x )          { return wfSetVar( $this->mInterfaceMessage, $x); }
4539
4540         function ParserOptions() {
4541                 global $wgUser;
4542                 $this->initialiseFromUser( $wgUser );
4543         }
4544
4545         /**
4546          * Get parser options
4547          * @static
4548          */
4549         function newFromUser( &$user ) {
4550                 $popts = new ParserOptions;
4551                 $popts->initialiseFromUser( $user );
4552                 return $popts;
4553         }
4554
4555         /** Get user options */
4556         function initialiseFromUser( &$userInput ) {
4557                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4558                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4559                 $fname = 'ParserOptions::initialiseFromUser';
4560                 wfProfileIn( $fname );
4561                 if ( !$userInput ) {
4562                         $user = new User;
4563                         $user->setLoaded( true );
4564                 } else {
4565                         $user =& $userInput;
4566                 }
4567
4568                 $this->mUseTeX = $wgUseTeX;
4569                 $this->mUseDynamicDates = $wgUseDynamicDates;
4570                 $this->mInterwikiMagic = $wgInterwikiMagic;
4571                 $this->mAllowExternalImages = $wgAllowExternalImages;
4572                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4573                 wfProfileIn( $fname.'-skin' );
4574                 $this->mSkin =& $user->getSkin();
4575                 wfProfileOut( $fname.'-skin' );
4576                 $this->mDateFormat = $user->getOption( 'date' );
4577                 $this->mEditSection = true;
4578                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4579                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4580                 $this->mTidy = false;
4581                 $this->mInterfaceMessage = false;
4582                 wfProfileOut( $fname );
4583         }
4584 }
4585
4586 /**
4587  * Callback function used by Parser::replaceLinkHolders()
4588  * to substitute link placeholders.
4589  */
4590 function &wfOutputReplaceMatches( $matches ) {
4591         global $wgOutputReplace;
4592         return $wgOutputReplace[$matches[1]];
4593 }
4594
4595 /**
4596  * Return the total number of articles
4597  */
4598 function wfNumberOfArticles() {
4599         global $wgNumberOfArticles;
4600
4601         wfLoadSiteStats();
4602         return $wgNumberOfArticles;
4603 }
4604
4605 /**
4606  * Return the number of files
4607  */
4608 function wfNumberOfFiles() {
4609         $fname = 'wfNumberOfFiles';
4610
4611         wfProfileIn( $fname );
4612         $dbr =& wfGetDB( DB_SLAVE );
4613         $numImages = $dbr->selectField('site_stats', 'ss_images', array(), $fname );
4614         wfProfileOut( $fname );
4615
4616         return $numImages;
4617 }
4618
4619 /**
4620  * Return the number of user accounts
4621  * @return integer
4622  */
4623 function wfNumberOfUsers() {
4624         wfProfileIn( 'wfNumberOfUsers' );
4625         $dbr =& wfGetDB( DB_SLAVE );
4626         $count = $dbr->selectField( 'site_stats', 'ss_users', array(), 'wfNumberOfUsers' );
4627         wfProfileOut( 'wfNumberOfUsers' );
4628         return (int)$count;
4629 }
4630
4631 /**
4632  * Return the total number of pages
4633  * @return integer
4634  */
4635 function wfNumberOfPages() {
4636         wfProfileIn( 'wfNumberOfPages' );
4637         $dbr =& wfGetDB( DB_SLAVE );
4638         $count = $dbr->selectField( 'site_stats', 'ss_total_pages', array(), 'wfNumberOfPages' );
4639         wfProfileOut( 'wfNumberOfPages' );
4640         return (int)$count;
4641 }
4642
4643 /**
4644  * Get various statistics from the database
4645  * @private
4646  */
4647 function wfLoadSiteStats() {
4648         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4649         $fname = 'wfLoadSiteStats';
4650
4651         if ( -1 != $wgNumberOfArticles ) return;
4652         $dbr =& wfGetDB( DB_SLAVE );
4653         $s = $dbr->selectRow( 'site_stats',
4654                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4655                 array( 'ss_row_id' => 1 ), $fname
4656         );
4657
4658         if ( $s === false ) {
4659                 return;
4660         } else {
4661                 $wgTotalViews = $s->ss_total_views;
4662                 $wgTotalEdits = $s->ss_total_edits;
4663                 $wgNumberOfArticles = $s->ss_good_articles;
4664         }
4665 }
4666
4667 /**
4668  * Escape html tags
4669  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4670  *
4671  * @param $in String: text that might contain HTML tags.
4672  * @return string Escaped string
4673  */
4674 function wfEscapeHTMLTagsOnly( $in ) {
4675         return str_replace(
4676                 array( '"', '>', '<' ),
4677                 array( '&quot;', '&gt;', '&lt;' ),
4678                 $in );
4679 }
4680
4681 ?>