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 require_once( 'ImageGallery.php' );
  13
  14 /**
  15  * Update this version number when the ParserOutput format
  16  * changes in an incompatible way, so the parser cache
  17  * can automatically discard old data.
  18  */
  19 define( 'MW_PARSER_VERSION', '1.6.1' );
  20
  21 /**
  22  * Variable substitution O(N^2) attack
  23  *
  24  * Without countermeasures, it would be possible to attack the parser by saving
  25  * a page filled with a large number of inclusions of large pages. The size of
  26  * the generated page would be proportional to the square of the input size.
  27  * Hence, we limit the number of inclusions of any given page, thus bringing any
  28  * attack back to O(N).
  29  */
  30
  31 define( 'MAX_INCLUDE_REPEAT', 100 );
  32 define( 'MAX_INCLUDE_SIZE', 1000000 ); // 1 Million
  33
  34 define( 'RLH_FOR_UPDATE', 1 );
  35
  36 # Allowed values for $mOutputType
  37 define( 'OT_HTML', 1 );
  38 define( 'OT_WIKI', 2 );
  39 define( 'OT_MSG' , 3 );
  40
  41 # string parameter for extractTags which will cause it
  42 # to strip HTML comments in addition to regular
  43 # <XML>-style tags. This should not be anything we
  44 # may want to use in wikisyntax
  45 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  46
  47 # Constants needed for external link processing
  48 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  49 # Everything except bracket, space, or control characters
  50 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  51 # Including space
  52 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x00-\\x1F\\x7F]' );
  53 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  54 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  55 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/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 /**
  63  * PHP Parser
  64  *
  65  * Processes wiki markup
  66  *
  67  * <pre>
  68  * There are three main entry points into the Parser class:
  69  * parse()
  70  *   produces HTML output
  71  * preSaveTransform().
  72  *   produces altered wiki markup.
  73  * transformMsg()
  74  *   performs brace substitution on MediaWiki messages
  75  *
  76  * Globals used:
  77  *    objects:   $wgLang, $wgContLang
  78  *
  79  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  80  *
  81  * settings:
  82  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  83  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  84  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  85  *
  86  *  * only within ParserOptions
  87  * </pre>
  88  *
  89  * @package MediaWiki
  90  */
  91 class Parser
  92 {
  93         /**#@+
  94          * @private
  95          */
  96         # Persistent:
  97         var $mTagHooks, $mFunctionHooks;
  98
  99         # Cleared with clearState():
 100         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 101         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 102         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 103         var $mTemplates,        // cache of already loaded templates, avoids
 104                                 // multiple SQL queries for the same string
 105             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 106                                 // in this path. Used for loop detection.
 107
 108         # Temporary
 109         # These are variables reset at least once per parse regardless of $clearState
 110         var $mOptions,      // ParserOptions object
 111                 $mTitle,        // Title context, used for self-link rendering and similar things
 112                 $mOutputType,   // Output type, one of the OT_xxx constants
 113                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 114
 115         /**#@-*/
 116
 117         /**
 118          * Constructor
 119          *
 120          * @public
 121          */
 122         function Parser() {
 123                 $this->mTagHooks = array();
 124                 $this->mFunctionHooks = array();
 125                 $this->clearState();
 126         }
 127
 128         /**
 129          * Clear Parser state
 130          *
 131          * @private
 132          */
 133         function clearState() {
 134                 $this->mOutput = new ParserOutput;
 135                 $this->mAutonumber = 0;
 136                 $this->mLastSection = '';
 137                 $this->mDTopen = false;
 138                 $this->mVariables = false;
 139                 $this->mIncludeCount = array();
 140                 $this->mStripState = array();
 141                 $this->mArgStack = array();
 142                 $this->mInPre = false;
 143                 $this->mInterwikiLinkHolders = array(
 144                         'texts' => array(),
 145                         'titles' => array()
 146                 );
 147                 $this->mLinkHolders = array(
 148                         'namespaces' => array(),
 149                         'dbkeys' => array(),
 150                         'queries' => array(),
 151                         'texts' => array(),
 152                         'titles' => array()
 153                 );
 154                 $this->mRevisionId = null;
 155
 156                 /**
 157                  * Prefix for temporary replacement strings for the multipass parser.
 158                  * \x07 should never appear in input as it's disallowed in XML.
 159                  * Using it at the front also gives us a little extra robustness
 160                  * since it shouldn't match when butted up against identifier-like
 161                  * string constructs.
 162                  */
 163                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 164
 165                 # Clear these on every parse, bug 4549
 166                 $this->mTemplates = array();
 167                 $this->mTemplatePath = array();
 168
 169                 $this->mShowToc = true;
 170                 $this->mForceTocPosition = false;
 171
 172                 wfRunHooks( 'ParserClearState', array( &$this ) );
 173         }
 174
 175         /**
 176          * Accessor for mUniqPrefix.
 177          *
 178          * @public
 179          */
 180         function UniqPrefix() {
 181                 return $this->mUniqPrefix;
 182         }
 183
 184         /**
 185          * Convert wikitext to HTML
 186          * Do not call this function recursively.
 187          *
 188          * @private
 189          * @param string $text Text we want to parse
 190          * @param Title &$title A title object
 191          * @param array $options
 192          * @param boolean $linestart
 193          * @param boolean $clearState
 194          * @param int $revid number to pass in {{REVISIONID}}
 195          * @return ParserOutput a ParserOutput
 196          */
 197         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 198                 /**
 199                  * First pass--just handle <nowiki> sections, pass the rest off
 200                  * to internalParse() which does all the real work.
 201                  */
 202
 203                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 204                 $fname = 'Parser::parse';
 205                 wfProfileIn( $fname );
 206
 207                 if ( $clearState ) {
 208                         $this->clearState();
 209                 }
 210
 211                 $this->mOptions = $options;
 212                 $this->mTitle =& $title;
 213                 $this->mRevisionId = $revid;
 214                 $this->mOutputType = OT_HTML;
 215
 216                 //$text = $this->strip( $text, $this->mStripState );
 217                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 218                 $x =& $this->mStripState;
 219
 220                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 221                 $text = $this->strip( $text, $x );
 222                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 223
 224                 # Hook to suspend the parser in this state
 225                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 226                         wfProfileOut( $fname );
 227                         return $text ;
 228                 }
 229
 230                 $text = $this->internalParse( $text );
 231
 232                 $text = $this->unstrip( $text, $this->mStripState );
 233
 234                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 235                 $fixtags = array(
 236                         # french spaces, last one Guillemet-left
 237                         # only if there is something before the space
 238                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 239                         # french spaces, Guillemet-right
 240                         '/(\\302\\253) /' => '\\1&nbsp;',
 241                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 242                 );
 243                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 244
 245                 # only once and last
 246                 $text = $this->doBlockLevels( $text, $linestart );
 247
 248                 $this->replaceLinkHolders( $text );
 249
 250                 # the position of the parserConvert() call should not be changed. it
 251                 # assumes that the links are all replaced and the only thing left
 252                 # is the <nowiki> mark.
 253                 # Side-effects: this calls $this->mOutput->setTitleText()
 254                 $text = $wgContLang->parserConvert( $text, $this );
 255
 256                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 257
 258                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 259
 260                 $text = Sanitizer::normalizeCharReferences( $text );
 261
 262                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 263                         $text = Parser::tidy($text);
 264                 } else {
 265                         # attempt to sanitize at least some nesting problems
 266                         # (bug #2702 and quite a few others)
 267                         $tidyregs = array(
 268                                 # ''Something [http://www.cool.com cool''] -->
 269                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 270                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 271                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 272                                 # fix up an anchor inside another anchor, only
 273                                 # at least for a single single nested link (bug 3695)
 274                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 275                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 276                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 277                                 # contains a div, so fix it up here; replace
 278                                 # div with escaped text
 279                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 280                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 281                                 # remove empty italic or bold tag pairs, some
 282                                 # introduced by rules above
 283                                 '/<([bi])><\/\\1>/' => ''
 284                         );
 285
 286                         $text = preg_replace(
 287                                 array_keys( $tidyregs ),
 288                                 array_values( $tidyregs ),
 289                                 $text );
 290                 }
 291
 292                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 293
 294                 $this->mOutput->setText( $text );
 295                 wfProfileOut( $fname );
 296
 297                 return $this->mOutput;
 298         }
 299
 300         /**
 301          * Get a random string
 302          *
 303          * @private
 304          * @static
 305          */
 306         function getRandomString() {
 307                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 308         }
 309
 310         function &getTitle() { return $this->mTitle; }
 311         function getOptions() { return $this->mOptions; }
 312
 313         /**
 314          * Replaces all occurrences of HTML-style comments and the given tags
 315          * in the text with a random marker and returns teh next text. The output
 316          * parameter $matches will be an associative array filled with data in
 317          * the form:
 318          *   'UNIQ-xxxxx' => array(
 319          *     'element',
 320          *     'tag content',
 321          *     array( 'param' => 'x' ),
 322          *     '<element param="x">tag content</element>' ) )
 323          *
 324          * @param $elements list of element names. Comments are always extracted.
 325          * @param $text Source text string.
 326          * @param $uniq_prefix
 327          *
 328          * @private
 329          * @static
 330          */
 331         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 332                 $rand = Parser::getRandomString();
 333                 $n = 1;
 334                 $stripped = '';
 335                 $matches = array();
 336
 337                 $taglist = implode( '|', $elements );
 338                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 339
 340                 while ( '' != $text ) {
 341                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 342                         $stripped .= $p[0];
 343                         if( count( $p ) < 5 ) {
 344                                 break;
 345                         }
 346                         if( count( $p ) > 5 ) {
 347                                 // comment
 348                                 $element    = $p[4];
 349                                 $attributes = '';
 350                                 $close      = '';
 351                                 $inside     = $p[5];
 352                         } else {
 353                                 // tag
 354                                 $element    = $p[1];
 355                                 $attributes = $p[2];
 356                                 $close      = $p[3];
 357                                 $inside     = $p[4];
 358                         }
 359
 360                         $marker = "$uniq_prefix-$element-$rand" . sprintf('%08X', $n++);
 361                         $stripped .= $marker;
 362
 363                         if ( $close === '/>' ) {
 364                                 // Empty element tag, <tag />
 365                                 $content = null;
 366                                 $text = $inside;
 367                                 $tail = null;
 368                         } else {
 369                                 if( $element == '!--' ) {
 370                                         $end = '/(-->)/';
 371                                 } else {
 372                                         $end = "/(<\\/$element\\s*>)/i";
 373                                 }
 374                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 375                                 $content = $q[0];
 376                                 if( count( $q ) < 3 ) {
 377                                         # No end tag -- let it run out to the end of the text.
 378                                         $tail = '';
 379                                         $text = '';
 380                                 } else {
 381                                         $tail = $q[1];
 382                                         $text = $q[2];
 383                                 }
 384                         }
 385
 386                         $matches[$marker] = array( $element,
 387                                 $content,
 388                                 Sanitizer::decodeTagAttributes( $attributes ),
 389                                 "<$element$attributes$close$content$tail" );
 390                 }
 391                 return $stripped;
 392         }
 393
 394         /**
 395          * Strips and renders nowiki, pre, math, hiero
 396          * If $render is set, performs necessary rendering operations on plugins
 397          * Returns the text, and fills an array with data needed in unstrip()
 398          * If the $state is already a valid strip state, it adds to the state
 399          *
 400          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 401          *  will be stripped in addition to other tags. This is important
 402          *  for section editing, where these comments cause confusion when
 403          *  counting the sections in the wikisource
 404          *
 405          * @private
 406          */
 407         function strip( $text, &$state, $stripcomments = false ) {
 408                 $render = ($this->mOutputType == OT_HTML);
 409
 410                 # Replace any instances of the placeholders
 411                 $uniq_prefix = $this->mUniqPrefix;
 412                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 413                 $commentState = array();
 414
 415                 $elements = array_merge(
 416                         array( 'nowiki', 'pre', 'gallery' ),
 417                         array_keys( $this->mTagHooks ) );
 418                 global $wgRawHtml;
 419                 if( $wgRawHtml ) {
 420                         $elements[] = 'html';
 421                 }
 422                 if( $this->mOptions->getUseTeX() ) {
 423                         $elements[] = 'math';
 424                 }
 425
 426
 427                 $matches = array();
 428                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 429
 430                 foreach( $matches as $marker => $data ) {
 431                         list( $element, $content, $params, $tag ) = $data;
 432                         if( $render ) {
 433                                 $tagName = strtolower( $element );
 434                                 switch( $tagName ) {
 435                                 case '!--':
 436                                         // Comment
 437                                         if( substr( $tag, -3 ) == '-->' ) {
 438                                                 $output = $tag;
 439                                         } else {
 440                                                 // Unclosed comment in input.
 441                                                 // Close it so later stripping can remove it
 442                                                 $output = "$tag-->";
 443                                         }
 444                                         break;
 445                                 case 'html':
 446                                         if( $wgRawHtml ) {
 447                                                 $output = $content;
 448                                                 break;
 449                                         }
 450                                         // Shouldn't happen otherwise. :)
 451                                 case 'nowiki':
 452                                         $output = wfEscapeHTMLTagsOnly( $content );
 453                                         break;
 454                                 case 'math':
 455                                         $output = renderMath( $content );
 456                                         break;
 457                                 case 'pre':
 458                                         // Backwards-compatibility hack
 459                                         $content = preg_replace( '!<nowiki>(.*?)</nowiki>!is', '\\1', $content );
 460                                         $output = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 461                                         break;
 462                                 case 'gallery':
 463                                         $output = $this->renderImageGallery( $content );
 464                                         break;
 465                                 default:
 466                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 467                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 468                                                         array( $content, $params, $this ) );
 469                                         } else {
 470                                                 wfDebugDieBacktrace( "Invalid call hook $element" );
 471                                         }
 472                                 }
 473                         } else {
 474                                 // Just stripping tags; keep the source
 475                                 $output = $tag;
 476                         }
 477                         if( !$stripcomments && $element == '!--' ) {
 478                                 $commentState[$marker] = $output;
 479                         } else {
 480                                 $state[$element][$marker] = $output;
 481                         }
 482                 }
 483
 484                 # Unstrip comments unless explicitly told otherwise.
 485                 # (The comments are always stripped prior to this point, so as to
 486                 # not invoke any extension tags / parser hooks contained within
 487                 # a comment.)
 488                 if ( !$stripcomments ) {
 489                         // Put them all back and forget them
 490                         $text = strtr( $text, $commentState );
 491                 }
 492
 493                 return $text;
 494         }
 495
 496         /**
 497          * Restores pre, math, and other extensions removed by strip()
 498          *
 499          * always call unstripNoWiki() after this one
 500          * @private
 501          */
 502         function unstrip( $text, &$state ) {
 503                 if ( !is_array( $state ) ) {
 504                         return $text;
 505                 }
 506
 507                 $replacements = array();
 508                 foreach( $state as $tag => $contentDict ) {
 509                         if( $tag != 'nowiki' && $tag != 'html' ) {
 510                                 foreach( $contentDict as $uniq => $content ) {
 511                                         $replacements[$uniq] = $content;
 512                                 }
 513                         }
 514                 }
 515                 $text = strtr( $text, $replacements );
 516
 517                 return $text;
 518         }
 519
 520         /**
 521          * Always call this after unstrip() to preserve the order
 522          *
 523          * @private
 524          */
 525         function unstripNoWiki( $text, &$state ) {
 526                 if ( !is_array( $state ) ) {
 527                         return $text;
 528                 }
 529
 530                 $replacements = array();
 531                 foreach( $state as $tag => $contentDict ) {
 532                         if( $tag == 'nowiki' || $tag == 'html' ) {
 533                                 foreach( $contentDict as $uniq => $content ) {
 534                                         $replacements[$uniq] = $content;
 535                                 }
 536                         }
 537                 }
 538                 $text = strtr( $text, $replacements );
 539
 540                 return $text;
 541         }
 542
 543         /**
 544          * Add an item to the strip state
 545          * Returns the unique tag which must be inserted into the stripped text
 546          * The tag will be replaced with the original text in unstrip()
 547          *
 548          * @private
 549          */
 550         function insertStripItem( $text, &$state ) {
 551                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 552                 if ( !$state ) {
 553                         $state = array();
 554                 }
 555                 $state['item'][$rnd] = $text;
 556                 return $rnd;
 557         }
 558
 559         /**
 560          * Interface with html tidy, used if $wgUseTidy = true.
 561          * If tidy isn't able to correct the markup, the original will be
 562          * returned in all its glory with a warning comment appended.
 563          *
 564          * Either the external tidy program or the in-process tidy extension
 565          * will be used depending on availability. Override the default
 566          * $wgTidyInternal setting to disable the internal if it's not working.
 567          *
 568          * @param string $text Hideous HTML input
 569          * @return string Corrected HTML output
 570          * @public
 571          * @static
 572          */
 573         function tidy( $text ) {
 574                 global $wgTidyInternal;
 575                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 576 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 577 '<head><title>test</title></head><body>'.$text.'</body></html>';
 578                 if( $wgTidyInternal ) {
 579                         $correctedtext = Parser::internalTidy( $wrappedtext );
 580                 } else {
 581                         $correctedtext = Parser::externalTidy( $wrappedtext );
 582                 }
 583                 if( is_null( $correctedtext ) ) {
 584                         wfDebug( "Tidy error detected!\n" );
 585                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 586                 }
 587                 return $correctedtext;
 588         }
 589
 590         /**
 591          * Spawn an external HTML tidy process and get corrected markup back from it.
 592          *
 593          * @private
 594          * @static
 595          */
 596         function externalTidy( $text ) {
 597                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 598                 $fname = 'Parser::externalTidy';
 599                 wfProfileIn( $fname );
 600
 601                 $cleansource = '';
 602                 $opts = ' -utf8';
 603
 604                 $descriptorspec = array(
 605                         0 => array('pipe', 'r'),
 606                         1 => array('pipe', 'w'),
 607                         2 => array('file', '/dev/null', 'a')
 608                 );
 609                 $pipes = array();
 610                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 611                 if (is_resource($process)) {
 612                         // Theoretically, this style of communication could cause a deadlock
 613                         // here. If the stdout buffer fills up, then writes to stdin could
 614                         // block. This doesn't appear to happen with tidy, because tidy only
 615                         // writes to stdout after it's finished reading from stdin. Search
 616                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 617                         fwrite($pipes[0], $text);
 618                         fclose($pipes[0]);
 619                         while (!feof($pipes[1])) {
 620                                 $cleansource .= fgets($pipes[1], 1024);
 621                         }
 622                         fclose($pipes[1]);
 623                         proc_close($process);
 624                 }
 625
 626                 wfProfileOut( $fname );
 627
 628                 if( $cleansource == '' && $text != '') {
 629                         // Some kind of error happened, so we couldn't get the corrected text.
 630                         // Just give up; we'll use the source text and append a warning.
 631                         return null;
 632                 } else {
 633                         return $cleansource;
 634                 }
 635         }
 636
 637         /**
 638          * Use the HTML tidy PECL extension to use the tidy library in-process,
 639          * saving the overhead of spawning a new process. Currently written to
 640          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 641          *
 642          * 'pear install tidy' should be able to compile the extension module.
 643          *
 644          * @private
 645          * @static
 646          */
 647         function internalTidy( $text ) {
 648                 global $wgTidyConf;
 649                 $fname = 'Parser::internalTidy';
 650                 wfProfileIn( $fname );
 651
 652                 tidy_load_config( $wgTidyConf );
 653                 tidy_set_encoding( 'utf8' );
 654                 tidy_parse_string( $text );
 655                 tidy_clean_repair();
 656                 if( tidy_get_status() == 2 ) {
 657                         // 2 is magic number for fatal error
 658                         // http://www.php.net/manual/en/function.tidy-get-status.php
 659                         $cleansource = null;
 660                 } else {
 661                         $cleansource = tidy_get_output();
 662                 }
 663                 wfProfileOut( $fname );
 664                 return $cleansource;
 665         }
 666
 667         /**
 668          * parse the wiki syntax used to render tables
 669          *
 670          * @private
 671          */
 672         function doTableStuff ( $t ) {
 673                 $fname = 'Parser::doTableStuff';
 674                 wfProfileIn( $fname );
 675
 676                 $t = explode ( "\n" , $t ) ;
 677                 $td = array () ; # Is currently a td tag open?
 678                 $ltd = array () ; # Was it TD or TH?
 679                 $tr = array () ; # Is currently a tr tag open?
 680                 $ltr = array () ; # tr attributes
 681                 $has_opened_tr = array(); # Did this table open a <tr> element?
 682                 $indent_level = 0; # indent level of the table
 683                 foreach ( $t AS $k => $x )
 684                 {
 685                         $x = trim ( $x ) ;
 686                         $fc = substr ( $x , 0 , 1 ) ;
 687                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 688                                 $indent_level = strlen( $matches[1] );
 689
 690                                 $attributes = $this->unstripForHTML( $matches[2] );
 691
 692                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 693                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 694                                 array_push ( $td , false ) ;
 695                                 array_push ( $ltd , '' ) ;
 696                                 array_push ( $tr , false ) ;
 697                                 array_push ( $ltr , '' ) ;
 698                                 array_push ( $has_opened_tr, false );
 699                         }
 700                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 701                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 702                                 $z = "</table>" . substr ( $x , 2);
 703                                 $l = array_pop ( $ltd ) ;
 704                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 705                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 706                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 707                                 array_pop ( $ltr ) ;
 708                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 709                         }
 710                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 711                                 $x = substr ( $x , 1 ) ;
 712                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 713                                 $z = '' ;
 714                                 $l = array_pop ( $ltd ) ;
 715                                 array_pop ( $has_opened_tr );
 716                                 array_push ( $has_opened_tr , true ) ;
 717                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 718                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 719                                 array_pop ( $ltr ) ;
 720                                 $t[$k] = $z ;
 721                                 array_push ( $tr , false ) ;
 722                                 array_push ( $td , false ) ;
 723                                 array_push ( $ltd , '' ) ;
 724                                 $attributes = $this->unstripForHTML( $x );
 725                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 726                         }
 727                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 728                                 # $x is a table row
 729                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 730                                         $fc = '+' ;
 731                                         $x = substr ( $x , 1 ) ;
 732                                 }
 733                                 $after = substr ( $x , 1 ) ;
 734                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 735
 736                                 // Split up multiple cells on the same line.
 737                                 // FIXME: This can result in improper nesting of tags processed
 738                                 // by earlier parser steps, but should avoid splitting up eg
 739                                 // attribute values containing literal "||".
 740                                 $after = wfExplodeMarkup( '||', $after );
 741
 742                                 $t[$k] = '' ;
 743
 744                                 # Loop through each table cell
 745                                 foreach ( $after AS $theline )
 746                                 {
 747                                         $z = '' ;
 748                                         if ( $fc != '+' )
 749                                         {
 750                                                 $tra = array_pop ( $ltr ) ;
 751                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 752                                                 array_push ( $tr , true ) ;
 753                                                 array_push ( $ltr , '' ) ;
 754                                                 array_pop ( $has_opened_tr );
 755                                                 array_push ( $has_opened_tr , true ) ;
 756                                         }
 757
 758                                         $l = array_pop ( $ltd ) ;
 759                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 760                                         if ( $fc == '|' ) $l = 'td' ;
 761                                         else if ( $fc == '!' ) $l = 'th' ;
 762                                         else if ( $fc == '+' ) $l = 'caption' ;
 763                                         else $l = '' ;
 764                                         array_push ( $ltd , $l ) ;
 765
 766                                         # Cell parameters
 767                                         $y = explode ( '|' , $theline , 2 ) ;
 768                                         # Note that a '|' inside an invalid link should not
 769                                         # be mistaken as delimiting cell parameters
 770                                         if ( strpos( $y[0], '[[' ) !== false ) {
 771                                                 $y = array ($theline);
 772                                         }
 773                                         if ( count ( $y ) == 1 )
 774                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 775                                         else {
 776                                                 $attributes = $this->unstripForHTML( $y[0] );
 777                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 778                                         }
 779                                         $t[$k] .= $y ;
 780                                         array_push ( $td , true ) ;
 781                                 }
 782                         }
 783                 }
 784
 785                 # Closing open td, tr && table
 786                 while ( count ( $td ) > 0 )
 787                 {
 788                         $l = array_pop ( $ltd ) ;
 789                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 790                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 791                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 792                         $t[] = '</table>' ;
 793                 }
 794
 795                 $t = implode ( "\n" , $t ) ;
 796                 # special case: don't return empty table
 797                 if($t == "<table>\n<tr><td></td></tr>\n</table>")
 798                         $t = '';
 799                 wfProfileOut( $fname );
 800                 return $t ;
 801         }
 802
 803         /**
 804          * Helper function for parse() that transforms wiki markup into
 805          * HTML. Only called for $mOutputType == OT_HTML.
 806          *
 807          * @private
 808          */
 809         function internalParse( $text ) {
 810                 $args = array();
 811                 $isMain = true;
 812                 $fname = 'Parser::internalParse';
 813                 wfProfileIn( $fname );
 814
 815                 # Remove <noinclude> tags and <includeonly> sections
 816                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 817                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 818                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 819
 820                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 821
 822                 $text = $this->replaceVariables( $text, $args );
 823
 824                 // Tables need to come after variable replacement for things to work
 825                 // properly; putting them before other transformations should keep
 826                 // exciting things like link expansions from showing up in surprising
 827                 // places.
 828                 $text = $this->doTableStuff( $text );
 829
 830                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 831
 832                 $text = $this->stripToc( $text );
 833                 $text = $this->doHeadings( $text );
 834                 if($this->mOptions->getUseDynamicDates()) {
 835                         $df =& DateFormatter::getInstance();
 836                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 837                 }
 838                 $text = $this->doAllQuotes( $text );
 839                 $text = $this->replaceInternalLinks( $text );
 840                 $text = $this->replaceExternalLinks( $text );
 841
 842                 # replaceInternalLinks may sometimes leave behind
 843                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 844                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 845
 846                 $text = $this->doMagicLinks( $text );
 847                 $text = $this->formatHeadings( $text, $isMain );
 848
 849                 wfProfileOut( $fname );
 850                 return $text;
 851         }
 852
 853         /**
 854          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 855          * magic external links.
 856          *
 857          * @private
 858          */
 859         function &doMagicLinks( &$text ) {
 860                 $text = $this->magicISBN( $text );
 861                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 862                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 863                 return $text;
 864         }
 865
 866         /**
 867          * Parse headers and return html
 868          *
 869          * @private
 870          */
 871         function doHeadings( $text ) {
 872                 $fname = 'Parser::doHeadings';
 873                 wfProfileIn( $fname );
 874                 for ( $i = 6; $i >= 1; --$i ) {
 875                         $h = str_repeat( '=', $i );
 876                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 877                           "<h{$i}>\\1</h{$i}>\\2", $text );
 878                 }
 879                 wfProfileOut( $fname );
 880                 return $text;
 881         }
 882
 883         /**
 884          * Replace single quotes with HTML markup
 885          * @private
 886          * @return string the altered text
 887          */
 888         function doAllQuotes( $text ) {
 889                 $fname = 'Parser::doAllQuotes';
 890                 wfProfileIn( $fname );
 891                 $outtext = '';
 892                 $lines = explode( "\n", $text );
 893                 foreach ( $lines as $line ) {
 894                         $outtext .= $this->doQuotes ( $line ) . "\n";
 895                 }
 896                 $outtext = substr($outtext, 0,-1);
 897                 wfProfileOut( $fname );
 898                 return $outtext;
 899         }
 900
 901         /**
 902          * Helper function for doAllQuotes()
 903          * @private
 904          */
 905         function doQuotes( $text ) {
 906                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 907                 if ( count( $arr ) == 1 )
 908                         return $text;
 909                 else
 910                 {
 911                         # First, do some preliminary work. This may shift some apostrophes from
 912                         # being mark-up to being text. It also counts the number of occurrences
 913                         # of bold and italics mark-ups.
 914                         $i = 0;
 915                         $numbold = 0;
 916                         $numitalics = 0;
 917                         foreach ( $arr as $r )
 918                         {
 919                                 if ( ( $i % 2 ) == 1 )
 920                                 {
 921                                         # If there are ever four apostrophes, assume the first is supposed to
 922                                         # be text, and the remaining three constitute mark-up for bold text.
 923                                         if ( strlen( $arr[$i] ) == 4 )
 924                                         {
 925                                                 $arr[$i-1] .= "'";
 926                                                 $arr[$i] = "'''";
 927                                         }
 928                                         # If there are more than 5 apostrophes in a row, assume they're all
 929                                         # text except for the last 5.
 930                                         else if ( strlen( $arr[$i] ) > 5 )
 931                                         {
 932                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 933                                                 $arr[$i] = "'''''";
 934                                         }
 935                                         # Count the number of occurrences of bold and italics mark-ups.
 936                                         # We are not counting sequences of five apostrophes.
 937                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 938                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 939                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 940                                 }
 941                                 $i++;
 942                         }
 943
 944                         # If there is an odd number of both bold and italics, it is likely
 945                         # that one of the bold ones was meant to be an apostrophe followed
 946                         # by italics. Which one we cannot know for certain, but it is more
 947                         # likely to be one that has a single-letter word before it.
 948                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 949                         {
 950                                 $i = 0;
 951                                 $firstsingleletterword = -1;
 952                                 $firstmultiletterword = -1;
 953                                 $firstspace = -1;
 954                                 foreach ( $arr as $r )
 955                                 {
 956                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 957                                         {
 958                                                 $x1 = substr ($arr[$i-1], -1);
 959                                                 $x2 = substr ($arr[$i-1], -2, 1);
 960                                                 if ($x1 == ' ') {
 961                                                         if ($firstspace == -1) $firstspace = $i;
 962                                                 } else if ($x2 == ' ') {
 963                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 964                                                 } else {
 965                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 966                                                 }
 967                                         }
 968                                         $i++;
 969                                 }
 970
 971                                 # If there is a single-letter word, use it!
 972                                 if ($firstsingleletterword > -1)
 973                                 {
 974                                         $arr [ $firstsingleletterword ] = "''";
 975                                         $arr [ $firstsingleletterword-1 ] .= "'";
 976                                 }
 977                                 # If not, but there's a multi-letter word, use that one.
 978                                 else if ($firstmultiletterword > -1)
 979                                 {
 980                                         $arr [ $firstmultiletterword ] = "''";
 981                                         $arr [ $firstmultiletterword-1 ] .= "'";
 982                                 }
 983                                 # ... otherwise use the first one that has neither.
 984                                 # (notice that it is possible for all three to be -1 if, for example,
 985                                 # there is only one pentuple-apostrophe in the line)
 986                                 else if ($firstspace > -1)
 987                                 {
 988                                         $arr [ $firstspace ] = "''";
 989                                         $arr [ $firstspace-1 ] .= "'";
 990                                 }
 991                         }
 992
 993                         # Now let's actually convert our apostrophic mush to HTML!
 994                         $output = '';
 995                         $buffer = '';
 996                         $state = '';
 997                         $i = 0;
 998                         foreach ($arr as $r)
 999                         {
1000                                 if (($i % 2) == 0)
1001                                 {
1002                                         if ($state == 'both')
1003                                                 $buffer .= $r;
1004                                         else
1005                                                 $output .= $r;
1006                                 }
1007                                 else
1008                                 {
1009                                         if (strlen ($r) == 2)
1010                                         {
1011                                                 if ($state == 'i')
1012                                                 { $output .= '</i>'; $state = ''; }
1013                                                 else if ($state == 'bi')
1014                                                 { $output .= '</i>'; $state = 'b'; }
1015                                                 else if ($state == 'ib')
1016                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1017                                                 else if ($state == 'both')
1018                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1019                                                 else # $state can be 'b' or ''
1020                                                 { $output .= '<i>'; $state .= 'i'; }
1021                                         }
1022                                         else if (strlen ($r) == 3)
1023                                         {
1024                                                 if ($state == 'b')
1025                                                 { $output .= '</b>'; $state = ''; }
1026                                                 else if ($state == 'bi')
1027                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1028                                                 else if ($state == 'ib')
1029                                                 { $output .= '</b>'; $state = 'i'; }
1030                                                 else if ($state == 'both')
1031                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1032                                                 else # $state can be 'i' or ''
1033                                                 { $output .= '<b>'; $state .= 'b'; }
1034                                         }
1035                                         else if (strlen ($r) == 5)
1036                                         {
1037                                                 if ($state == 'b')
1038                                                 { $output .= '</b><i>'; $state = 'i'; }
1039                                                 else if ($state == 'i')
1040                                                 { $output .= '</i><b>'; $state = 'b'; }
1041                                                 else if ($state == 'bi')
1042                                                 { $output .= '</i></b>'; $state = ''; }
1043                                                 else if ($state == 'ib')
1044                                                 { $output .= '</b></i>'; $state = ''; }
1045                                                 else if ($state == 'both')
1046                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1047                                                 else # ($state == '')
1048                                                 { $buffer = ''; $state = 'both'; }
1049                                         }
1050                                 }
1051                                 $i++;
1052                         }
1053                         # Now close all remaining tags.  Notice that the order is important.
1054                         if ($state == 'b' || $state == 'ib')
1055                                 $output .= '</b>';
1056                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1057                                 $output .= '</i>';
1058                         if ($state == 'bi')
1059                                 $output .= '</b>';
1060                         if ($state == 'both')
1061                                 $output .= '<b><i>'.$buffer.'</i></b>';
1062                         return $output;
1063                 }
1064         }
1065
1066         /**
1067          * Replace external links
1068          *
1069          * Note: this is all very hackish and the order of execution matters a lot.
1070          * Make sure to run maintenance/parserTests.php if you change this code.
1071          *
1072          * @private
1073          */
1074         function replaceExternalLinks( $text ) {
1075                 global $wgContLang;
1076                 $fname = 'Parser::replaceExternalLinks';
1077                 wfProfileIn( $fname );
1078
1079                 $sk =& $this->mOptions->getSkin();
1080
1081                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1082
1083                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1084
1085                 $i = 0;
1086                 while ( $i<count( $bits ) ) {
1087                         $url = $bits[$i++];
1088                         $protocol = $bits[$i++];
1089                         $text = $bits[$i++];
1090                         $trail = $bits[$i++];
1091
1092                         # The characters '<' and '>' (which were escaped by
1093                         # removeHTMLtags()) should not be included in
1094                         # URLs, per RFC 2396.
1095                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1096                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1097                                 $url = substr($url, 0, $m2[0][1]);
1098                         }
1099
1100                         # If the link text is an image URL, replace it with an <img> tag
1101                         # This happened by accident in the original parser, but some people used it extensively
1102                         $img = $this->maybeMakeExternalImage( $text );
1103                         if ( $img !== false ) {
1104                                 $text = $img;
1105                         }
1106
1107                         $dtrail = '';
1108
1109                         # Set linktype for CSS - if URL==text, link is essentially free
1110                         $linktype = ($text == $url) ? 'free' : 'text';
1111
1112                         # No link text, e.g. [http://domain.tld/some.link]
1113                         if ( $text == '' ) {
1114                                 # Autonumber if allowed. See bug #5918
1115                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1116                                         $text = '[' . ++$this->mAutonumber . ']';
1117                                         $linktype = 'autonumber';
1118                                 } else {
1119                                         # Otherwise just use the URL
1120                                         $text = htmlspecialchars( $url );
1121                                         $linktype = 'free';
1122                                 }
1123                         } else {
1124                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1125                                 # Check for trail
1126                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1127                         }
1128
1129                         $text = $wgContLang->markNoConversion($text);
1130
1131                         # Normalize any HTML entities in input. They will be
1132                         # re-escaped by makeExternalLink().
1133                         $url = Sanitizer::decodeCharReferences( $url );
1134
1135                         # Process the trail (i.e. everything after this link up until start of the next link),
1136                         # replacing any non-bracketed links
1137                         $trail = $this->replaceFreeExternalLinks( $trail );
1138
1139                         # Use the encoded URL
1140                         # This means that users can paste URLs directly into the text
1141                         # Funny characters like &ouml; aren't valid in URLs anyway
1142                         # This was changed in August 2004
1143                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1144
1145                         # Register link in the output object.
1146                         # Replace unnecessary URL escape codes with the referenced character
1147                         # This prevents spammers from hiding links from the filters
1148                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1149                         $this->mOutput->addExternalLink( $pasteurized );
1150                 }
1151
1152                 wfProfileOut( $fname );
1153                 return $s;
1154         }
1155
1156         /**
1157          * Replace anything that looks like a URL with a link
1158          * @private
1159          */
1160         function replaceFreeExternalLinks( $text ) {
1161                 global $wgContLang;
1162                 $fname = 'Parser::replaceFreeExternalLinks';
1163                 wfProfileIn( $fname );
1164
1165                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1166                 $s = array_shift( $bits );
1167                 $i = 0;
1168
1169                 $sk =& $this->mOptions->getSkin();
1170
1171                 while ( $i < count( $bits ) ){
1172                         $protocol = $bits[$i++];
1173                         $remainder = $bits[$i++];
1174
1175                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1176                                 # Found some characters after the protocol that look promising
1177                                 $url = $protocol . $m[1];
1178                                 $trail = $m[2];
1179
1180                                 # special case: handle urls as url args:
1181                                 # http://www.example.com/foo?=http://www.example.com/bar
1182                                 if(strlen($trail) == 0 &&
1183                                         isset($bits[$i]) &&
1184                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1185                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1186                                 {
1187                                         # add protocol, arg
1188                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1189                                         $i += 2;
1190                                         $trail = $m[2];
1191                                 }
1192
1193                                 # The characters '<' and '>' (which were escaped by
1194                                 # removeHTMLtags()) should not be included in
1195                                 # URLs, per RFC 2396.
1196                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1197                                         $trail = substr($url, $m2[0][1]) . $trail;
1198                                         $url = substr($url, 0, $m2[0][1]);
1199                                 }
1200
1201                                 # Move trailing punctuation to $trail
1202                                 $sep = ',;\.:!?';
1203                                 # If there is no left bracket, then consider right brackets fair game too
1204                                 if ( strpos( $url, '(' ) === false ) {
1205                                         $sep .= ')';
1206                                 }
1207
1208                                 $numSepChars = strspn( strrev( $url ), $sep );
1209                                 if ( $numSepChars ) {
1210                                         $trail = substr( $url, -$numSepChars ) . $trail;
1211                                         $url = substr( $url, 0, -$numSepChars );
1212                                 }
1213
1214                                 # Normalize any HTML entities in input. They will be
1215                                 # re-escaped by makeExternalLink() or maybeMakeExternalImage()
1216                                 $url = Sanitizer::decodeCharReferences( $url );
1217
1218                                 # Is this an external image?
1219                                 $text = $this->maybeMakeExternalImage( $url );
1220                                 if ( $text === false ) {
1221                                         # Not an image, make a link
1222                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1223                                         # Register it in the output object...
1224                                         # Replace unnecessary URL escape codes with their equivalent characters
1225                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1226                                         $this->mOutput->addExternalLink( $pasteurized );
1227                                 }
1228                                 $s .= $text . $trail;
1229                         } else {
1230                                 $s .= $protocol . $remainder;
1231                         }
1232                 }
1233                 wfProfileOut( $fname );
1234                 return $s;
1235         }
1236
1237         /**
1238          * Replace unusual URL escape codes with their equivalent characters
1239          * @param string
1240          * @return string
1241          * @static
1242          * @fixme This can merge genuinely required bits in the path or query string,
1243          *        breaking legit URLs. A proper fix would treat the various parts of
1244          *        the URL differently; as a workaround, just use the output for
1245          *        statistical records, not for actual linking/output.
1246          */
1247         function replaceUnusualEscapes( $url ) {
1248                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1249                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1250         }
1251
1252         /**
1253          * Callback function used in replaceUnusualEscapes().
1254          * Replaces unusual URL escape codes with their equivalent character
1255          * @static
1256          * @private
1257          */
1258         function replaceUnusualEscapesCallback( $matches ) {
1259                 $char = urldecode( $matches[0] );
1260                 $ord = ord( $char );
1261                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1262                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1263                         // No, shouldn't be escaped
1264                         return $char;
1265                 } else {
1266                         // Yes, leave it escaped
1267                         return $matches[0];
1268                 }
1269         }
1270
1271         /**
1272          * make an image if it's allowed, either through the global
1273          * option or through the exception
1274          * @private
1275          */
1276         function maybeMakeExternalImage( $url ) {
1277                 $sk =& $this->mOptions->getSkin();
1278                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1279                 $imagesexception = !empty($imagesfrom);
1280                 $text = false;
1281                 if ( $this->mOptions->getAllowExternalImages()
1282                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1283                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1284                                 # Image found
1285                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1286                         }
1287                 }
1288                 return $text;
1289         }
1290
1291         /**
1292          * Process [[ ]] wikilinks
1293          *
1294          * @private
1295          */
1296         function replaceInternalLinks( $s ) {
1297                 global $wgContLang;
1298                 static $fname = 'Parser::replaceInternalLinks' ;
1299
1300                 wfProfileIn( $fname );
1301
1302                 wfProfileIn( $fname.'-setup' );
1303                 static $tc = FALSE;
1304                 # the % is needed to support urlencoded titles as well
1305                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1306
1307                 $sk =& $this->mOptions->getSkin();
1308
1309                 #split the entire text string on occurences of [[
1310                 $a = explode( '[[', ' ' . $s );
1311                 #get the first element (all text up to first [[), and remove the space we added
1312                 $s = array_shift( $a );
1313                 $s = substr( $s, 1 );
1314
1315                 # Match a link having the form [[namespace:link|alternate]]trail
1316                 static $e1 = FALSE;
1317                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1318                 # Match cases where there is no "]]", which might still be images
1319                 static $e1_img = FALSE;
1320                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1321                 # Match the end of a line for a word that's not followed by whitespace,
1322                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1323                 $e2 = wfMsgForContent( 'linkprefix' );
1324
1325                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1326
1327                 if( is_null( $this->mTitle ) ) {
1328                         wfDebugDieBacktrace( 'nooo' );
1329                 }
1330                 $nottalk = !$this->mTitle->isTalkPage();
1331
1332                 if ( $useLinkPrefixExtension ) {
1333                         if ( preg_match( $e2, $s, $m ) ) {
1334                                 $first_prefix = $m[2];
1335                         } else {
1336                                 $first_prefix = false;
1337                         }
1338                 } else {
1339                         $prefix = '';
1340                 }
1341
1342                 $selflink = $this->mTitle->getPrefixedText();
1343                 wfProfileOut( $fname.'-setup' );
1344
1345                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1346                 $useSubpages = $this->areSubpagesAllowed();
1347
1348                 # Loop for each link
1349                 for ($k = 0; isset( $a[$k] ); $k++) {
1350                         $line = $a[$k];
1351                         if ( $useLinkPrefixExtension ) {
1352                                 wfProfileIn( $fname.'-prefixhandling' );
1353                                 if ( preg_match( $e2, $s, $m ) ) {
1354                                         $prefix = $m[2];
1355                                         $s = $m[1];
1356                                 } else {
1357                                         $prefix='';
1358                                 }
1359                                 # first link
1360                                 if($first_prefix) {
1361                                         $prefix = $first_prefix;
1362                                         $first_prefix = false;
1363                                 }
1364                                 wfProfileOut( $fname.'-prefixhandling' );
1365                         }
1366
1367                         $might_be_img = false;
1368
1369                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1370                                 $text = $m[2];
1371                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1372                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1373                                 # the real problem is with the $e1 regex
1374                                 # See bug 1300.
1375                                 #
1376                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1377                                 # and no image is in sight. See bug 2095.
1378                                 #
1379                                 if( $text !== '' &&
1380                                         preg_match( "/^\](.*)/s", $m[3], $n ) &&
1381                                         strpos($text, '[') !== false
1382                                 )
1383                                 {
1384                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1385                                         $m[3] = $n[1];
1386                                 }
1387                                 # fix up urlencoded title texts
1388                                 if(preg_match('/%/', $m[1] ))
1389                                         # Should anchors '#' also be rejected?
1390                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1391                                 $trail = $m[3];
1392                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1393                                 $might_be_img = true;
1394                                 $text = $m[2];
1395                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1396                                 $trail = "";
1397                         } else { # Invalid form; output directly
1398                                 $s .= $prefix . '[[' . $line ;
1399                                 continue;
1400                         }
1401
1402                         # Don't allow internal links to pages containing
1403                         # PROTO: where PROTO is a valid URL protocol; these
1404                         # should be external links.
1405                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1406                                 $s .= $prefix . '[[' . $line ;
1407                                 continue;
1408                         }
1409
1410                         # Make subpage if necessary
1411                         if( $useSubpages ) {
1412                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1413                         } else {
1414                                 $link = $m[1];
1415                         }
1416
1417                         $noforce = (substr($m[1], 0, 1) != ':');
1418                         if (!$noforce) {
1419                                 # Strip off leading ':'
1420                                 $link = substr($link, 1);
1421                         }
1422
1423                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1424                         if( !$nt ) {
1425                                 $s .= $prefix . '[[' . $line;
1426                                 continue;
1427                         }
1428
1429                         #check other language variants of the link
1430                         #if the article does not exist
1431                         if( $checkVariantLink
1432                             && $nt->getArticleID() == 0 ) {
1433                                 $wgContLang->findVariantLink($link, $nt);
1434                         }
1435
1436                         $ns = $nt->getNamespace();
1437                         $iw = $nt->getInterWiki();
1438
1439                         if ($might_be_img) { # if this is actually an invalid link
1440                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1441                                         $found = false;
1442                                         while (isset ($a[$k+1]) ) {
1443                                                 #look at the next 'line' to see if we can close it there
1444                                                 $spliced = array_splice( $a, $k + 1, 1 );
1445                                                 $next_line = array_shift( $spliced );
1446                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1447                                                 # the first ]] closes the inner link, the second the image
1448                                                         $found = true;
1449                                                         $text .= '[[' . $m[1];
1450                                                         $trail = $m[2];
1451                                                         break;
1452                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1453                                                         #if there's exactly one ]] that's fine, we'll keep looking
1454                                                         $text .= '[[' . $m[0];
1455                                                 } else {
1456                                                         #if $next_line is invalid too, we need look no further
1457                                                         $text .= '[[' . $next_line;
1458                                                         break;
1459                                                 }
1460                                         }
1461                                         if ( !$found ) {
1462                                                 # we couldn't find the end of this imageLink, so output it raw
1463                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1464                                                 $text = $this->replaceInternalLinks($text);
1465                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1466                                                 # note: no $trail, because without an end, there *is* no trail
1467                                                 continue;
1468                                         }
1469                                 } else { #it's not an image, so output it raw
1470                                         $s .= $prefix . '[[' . $link . '|' . $text;
1471                                         # note: no $trail, because without an end, there *is* no trail
1472                                         continue;
1473                                 }
1474                         }
1475
1476                         $wasblank = ( '' == $text );
1477                         if( $wasblank ) $text = $link;
1478
1479
1480                         # Link not escaped by : , create the various objects
1481                         if( $noforce ) {
1482
1483                                 # Interwikis
1484                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1485                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1486                                         $s = rtrim($s . "\n");
1487                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1488                                         continue;
1489                                 }
1490
1491                                 if ( $ns == NS_IMAGE ) {
1492                                         wfProfileIn( "$fname-image" );
1493                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1494                                                 # recursively parse links inside the image caption
1495                                                 # actually, this will parse them in any other parameters, too,
1496                                                 # but it might be hard to fix that, and it doesn't matter ATM
1497                                                 $text = $this->replaceExternalLinks($text);
1498                                                 $text = $this->replaceInternalLinks($text);
1499
1500                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1501                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1502                                                 $this->mOutput->addImage( $nt->getDBkey() );
1503
1504                                                 wfProfileOut( "$fname-image" );
1505                                                 continue;
1506                                         }
1507                                         wfProfileOut( "$fname-image" );
1508
1509                                 }
1510
1511                                 if ( $ns == NS_CATEGORY ) {
1512                                         wfProfileIn( "$fname-category" );
1513                                         $s = rtrim($s . "\n"); # bug 87
1514
1515                                         if ( $wasblank ) {
1516                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1517                                                         $sortkey = $this->mTitle->getText();
1518                                                 } else {
1519                                                         $sortkey = $this->mTitle->getPrefixedText();
1520                                                 }
1521                                         } else {
1522                                                 $sortkey = $text;
1523                                         }
1524                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1525                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1526                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1527
1528                                         /**
1529                                          * Strip the whitespace Category links produce, see bug 87
1530                                          * @todo We might want to use trim($tmp, "\n") here.
1531                                          */
1532                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1533
1534                                         wfProfileOut( "$fname-category" );
1535                                         continue;
1536                                 }
1537                         }
1538
1539                         if( ( $nt->getPrefixedText() === $selflink ) &&
1540                             ( $nt->getFragment() === '' ) ) {
1541                                 # Self-links are handled specially; generally de-link and change to bold.
1542                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1543                                 continue;
1544                         }
1545
1546                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1547                         if( $ns == NS_MEDIA ) {
1548                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1549                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1550                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1551                                 $this->mOutput->addImage( $nt->getDBkey() );
1552                                 continue;
1553                         } elseif( $ns == NS_SPECIAL ) {
1554                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1555                                 continue;
1556                         } elseif( $ns == NS_IMAGE ) {
1557                                 $img = Image::newFromTitle( $nt );
1558                                 if( $img->exists() ) {
1559                                         // Force a blue link if the file exists; may be a remote
1560                                         // upload on the shared repository, and we want to see its
1561                                         // auto-generated page.
1562                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1563                                         continue;
1564                                 }
1565                         }
1566                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1567                 }
1568                 wfProfileOut( $fname );
1569                 return $s;
1570         }
1571
1572         /**
1573          * Make a link placeholder. The text returned can be later resolved to a real link with
1574          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1575          * parsing of interwiki links, and secondly to allow all extistence checks and
1576          * article length checks (for stub links) to be bundled into a single query.
1577          *
1578          */
1579         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1580                 if ( ! is_object($nt) ) {
1581                         # Fail gracefully
1582                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1583                 } else {
1584                         # Separate the link trail from the rest of the link
1585                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1586
1587                         if ( $nt->isExternal() ) {
1588                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1589                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1590                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1591                         } else {
1592                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1593                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1594                                 $this->mLinkHolders['queries'][] = $query;
1595                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1596                                 $this->mLinkHolders['titles'][] = $nt;
1597
1598                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1599                         }
1600                 }
1601                 return $retVal;
1602         }
1603
1604         /**
1605          * Render a forced-blue link inline; protect against double expansion of
1606          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1607          * Since this little disaster has to split off the trail text to avoid
1608          * breaking URLs in the following text without breaking trails on the
1609          * wiki links, it's been made into a horrible function.
1610          *
1611          * @param Title $nt
1612          * @param string $text
1613          * @param string $query
1614          * @param string $trail
1615          * @param string $prefix
1616          * @return string HTML-wikitext mix oh yuck
1617          */
1618         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1619                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1620                 $sk =& $this->mOptions->getSkin();
1621                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1622                 return $this->armorLinks( $link ) . $trail;
1623         }
1624
1625         /**
1626          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1627          * going to go through further parsing steps before inline URL expansion.
1628          *
1629          * In particular this is important when using action=render, which causes
1630          * full URLs to be included.
1631          *
1632          * Oh man I hate our multi-layer parser!
1633          *
1634          * @param string more-or-less HTML
1635          * @return string less-or-more HTML with NOPARSE bits
1636          */
1637         function armorLinks( $text ) {
1638                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1639                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1640         }
1641
1642         /**
1643          * Return true if subpage links should be expanded on this page.
1644          * @return bool
1645          */
1646         function areSubpagesAllowed() {
1647                 # Some namespaces don't allow subpages
1648                 global $wgNamespacesWithSubpages;
1649                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1650         }
1651
1652         /**
1653          * Handle link to subpage if necessary
1654          * @param string $target the source of the link
1655          * @param string &$text the link text, modified as necessary
1656          * @return string the full name of the link
1657          * @private
1658          */
1659         function maybeDoSubpageLink($target, &$text) {
1660                 # Valid link forms:
1661                 # Foobar -- normal
1662                 # :Foobar -- override special treatment of prefix (images, language links)
1663                 # /Foobar -- convert to CurrentPage/Foobar
1664                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1665                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1666                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1667
1668                 $fname = 'Parser::maybeDoSubpageLink';
1669                 wfProfileIn( $fname );
1670                 $ret = $target; # default return value is no change
1671
1672                 # Some namespaces don't allow subpages,
1673                 # so only perform processing if subpages are allowed
1674                 if( $this->areSubpagesAllowed() ) {
1675                         # Look at the first character
1676                         if( $target != '' && $target{0} == '/' ) {
1677                                 # / at end means we don't want the slash to be shown
1678                                 if( substr( $target, -1, 1 ) == '/' ) {
1679                                         $target = substr( $target, 1, -1 );
1680                                         $noslash = $target;
1681                                 } else {
1682                                         $noslash = substr( $target, 1 );
1683                                 }
1684
1685                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1686                                 if( '' === $text ) {
1687                                         $text = $target;
1688                                 } # this might be changed for ugliness reasons
1689                         } else {
1690                                 # check for .. subpage backlinks
1691                                 $dotdotcount = 0;
1692                                 $nodotdot = $target;
1693                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1694                                         ++$dotdotcount;
1695                                         $nodotdot = substr( $nodotdot, 3 );
1696                                 }
1697                                 if($dotdotcount > 0) {
1698                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1699                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1700                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1701                                                 # / at the end means don't show full path
1702                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1703                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1704                                                         if( '' === $text ) {
1705                                                                 $text = $nodotdot;
1706                                                         }
1707                                                 }
1708                                                 $nodotdot = trim( $nodotdot );
1709                                                 if( $nodotdot != '' ) {
1710                                                         $ret .= '/' . $nodotdot;
1711                                                 }
1712                                         }
1713                                 }
1714                         }
1715                 }
1716
1717                 wfProfileOut( $fname );
1718                 return $ret;
1719         }
1720
1721         /**#@+
1722          * Used by doBlockLevels()
1723          * @private
1724          */
1725         /* private */ function closeParagraph() {
1726                 $result = '';
1727                 if ( '' != $this->mLastSection ) {
1728                         $result = '</' . $this->mLastSection  . ">\n";
1729                 }
1730                 $this->mInPre = false;
1731                 $this->mLastSection = '';
1732                 return $result;
1733         }
1734         # getCommon() returns the length of the longest common substring
1735         # of both arguments, starting at the beginning of both.
1736         #
1737         /* private */ function getCommon( $st1, $st2 ) {
1738                 $fl = strlen( $st1 );
1739                 $shorter = strlen( $st2 );
1740                 if ( $fl < $shorter ) { $shorter = $fl; }
1741
1742                 for ( $i = 0; $i < $shorter; ++$i ) {
1743                         if ( $st1{$i} != $st2{$i} ) { break; }
1744                 }
1745                 return $i;
1746         }
1747         # These next three functions open, continue, and close the list
1748         # element appropriate to the prefix character passed into them.
1749         #
1750         /* private */ function openList( $char ) {
1751                 $result = $this->closeParagraph();
1752
1753                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1754                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1755                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1756                 else if ( ';' == $char ) {
1757                         $result .= '<dl><dt>';
1758                         $this->mDTopen = true;
1759                 }
1760                 else { $result = '<!-- ERR 1 -->'; }
1761
1762                 return $result;
1763         }
1764
1765         /* private */ function nextItem( $char ) {
1766                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1767                 else if ( ':' == $char || ';' == $char ) {
1768                         $close = '</dd>';
1769                         if ( $this->mDTopen ) { $close = '</dt>'; }
1770                         if ( ';' == $char ) {
1771                                 $this->mDTopen = true;
1772                                 return $close . '<dt>';
1773                         } else {
1774                                 $this->mDTopen = false;
1775                                 return $close . '<dd>';
1776                         }
1777                 }
1778                 return '<!-- ERR 2 -->';
1779         }
1780
1781         /* private */ function closeList( $char ) {
1782                 if ( '*' == $char ) { $text = '</li></ul>'; }
1783                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1784                 else if ( ':' == $char ) {
1785                         if ( $this->mDTopen ) {
1786                                 $this->mDTopen = false;
1787                                 $text = '</dt></dl>';
1788                         } else {
1789                                 $text = '</dd></dl>';
1790                         }
1791                 }
1792                 else {  return '<!-- ERR 3 -->'; }
1793                 return $text."\n";
1794         }
1795         /**#@-*/
1796
1797         /**
1798          * Make lists from lines starting with ':', '*', '#', etc.
1799          *
1800          * @private
1801          * @return string the lists rendered as HTML
1802          */
1803         function doBlockLevels( $text, $linestart ) {
1804                 $fname = 'Parser::doBlockLevels';
1805                 wfProfileIn( $fname );
1806
1807                 # Parsing through the text line by line.  The main thing
1808                 # happening here is handling of block-level elements p, pre,
1809                 # and making lists from lines starting with * # : etc.
1810                 #
1811                 $textLines = explode( "\n", $text );
1812
1813                 $lastPrefix = $output = '';
1814                 $this->mDTopen = $inBlockElem = false;
1815                 $prefixLength = 0;
1816                 $paragraphStack = false;
1817
1818                 if ( !$linestart ) {
1819                         $output .= array_shift( $textLines );
1820                 }
1821                 foreach ( $textLines as $oLine ) {
1822                         $lastPrefixLength = strlen( $lastPrefix );
1823                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1824                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1825                         if ( !$this->mInPre ) {
1826                                 # Multiple prefixes may abut each other for nested lists.
1827                                 $prefixLength = strspn( $oLine, '*#:;' );
1828                                 $pref = substr( $oLine, 0, $prefixLength );
1829
1830                                 # eh?
1831                                 $pref2 = str_replace( ';', ':', $pref );
1832                                 $t = substr( $oLine, $prefixLength );
1833                                 $this->mInPre = !empty($preOpenMatch);
1834                         } else {
1835                                 # Don't interpret any other prefixes in preformatted text
1836                                 $prefixLength = 0;
1837                                 $pref = $pref2 = '';
1838                                 $t = $oLine;
1839                         }
1840
1841                         # List generation
1842                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1843                                 # Same as the last item, so no need to deal with nesting or opening stuff
1844                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1845                                 $paragraphStack = false;
1846
1847                                 if ( substr( $pref, -1 ) == ';') {
1848                                         # The one nasty exception: definition lists work like this:
1849                                         # ; title : definition text
1850                                         # So we check for : in the remainder text to split up the
1851                                         # title and definition, without b0rking links.
1852                                         $term = $t2 = '';
1853                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1854                                                 $t = $t2;
1855                                                 $output .= $term . $this->nextItem( ':' );
1856                                         }
1857                                 }
1858                         } elseif( $prefixLength || $lastPrefixLength ) {
1859                                 # Either open or close a level...
1860                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1861                                 $paragraphStack = false;
1862
1863                                 while( $commonPrefixLength < $lastPrefixLength ) {
1864                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1865                                         --$lastPrefixLength;
1866                                 }
1867                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1868                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1869                                 }
1870                                 while ( $prefixLength > $commonPrefixLength ) {
1871                                         $char = substr( $pref, $commonPrefixLength, 1 );
1872                                         $output .= $this->openList( $char );
1873
1874                                         if ( ';' == $char ) {
1875                                                 # FIXME: This is dupe of code above
1876                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1877                                                         $t = $t2;
1878                                                         $output .= $term . $this->nextItem( ':' );
1879                                                 }
1880                                         }
1881                                         ++$commonPrefixLength;
1882                                 }
1883                                 $lastPrefix = $pref2;
1884                         }
1885                         if( 0 == $prefixLength ) {
1886                                 wfProfileIn( "$fname-paragraph" );
1887                                 # No prefix (not in list)--go to paragraph mode
1888                                 // XXX: use a stack for nestable elements like span, table and div
1889                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1890                                 $closematch = preg_match(
1891                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1892                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1893                                 if ( $openmatch or $closematch ) {
1894                                         $paragraphStack = false;
1895                                         # TODO bug 5718: paragraph closed
1896                                         $output .= $this->closeParagraph();
1897                                         if ( $preOpenMatch and !$preCloseMatch ) {
1898                                                 $this->mInPre = true;
1899                                         }
1900                                         if ( $closematch ) {
1901                                                 $inBlockElem = false;
1902                                         } else {
1903                                                 $inBlockElem = true;
1904                                         }
1905                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1906                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1907                                                 // pre
1908                                                 if ($this->mLastSection != 'pre') {
1909                                                         $paragraphStack = false;
1910                                                         $output .= $this->closeParagraph().'<pre>';
1911                                                         $this->mLastSection = 'pre';
1912                                                 }
1913                                                 $t = substr( $t, 1 );
1914                                         } else {
1915                                                 // paragraph
1916                                                 if ( '' == trim($t) ) {
1917                                                         if ( $paragraphStack ) {
1918                                                                 $output .= $paragraphStack.'<br />';
1919                                                                 $paragraphStack = false;
1920                                                                 $this->mLastSection = 'p';
1921                                                         } else {
1922                                                                 if ($this->mLastSection != 'p' ) {
1923                                                                         $output .= $this->closeParagraph();
1924                                                                         $this->mLastSection = '';
1925                                                                         $paragraphStack = '<p>';
1926                                                                 } else {
1927                                                                         $paragraphStack = '</p><p>';
1928                                                                 }
1929                                                         }
1930                                                 } else {
1931                                                         if ( $paragraphStack ) {
1932                                                                 $output .= $paragraphStack;
1933                                                                 $paragraphStack = false;
1934                                                                 $this->mLastSection = 'p';
1935                                                         } else if ($this->mLastSection != 'p') {
1936                                                                 $output .= $this->closeParagraph().'<p>';
1937                                                                 $this->mLastSection = 'p';
1938                                                         }
1939                                                 }
1940                                         }
1941                                 }
1942                                 wfProfileOut( "$fname-paragraph" );
1943                         }
1944                         // somewhere above we forget to get out of pre block (bug 785)
1945                         if($preCloseMatch && $this->mInPre) {
1946                                 $this->mInPre = false;
1947                         }
1948                         if ($paragraphStack === false) {
1949                                 $output .= $t."\n";
1950                         }
1951                 }
1952                 while ( $prefixLength ) {
1953                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1954                         --$prefixLength;
1955                 }
1956                 if ( '' != $this->mLastSection ) {
1957                         $output .= '</' . $this->mLastSection . '>';
1958                         $this->mLastSection = '';
1959                 }
1960
1961                 wfProfileOut( $fname );
1962                 return $output;
1963         }
1964
1965         /**
1966          * Split up a string on ':', ignoring any occurences inside
1967          * <a>..</a> or <span>...</span>
1968          * @param string $str the string to split
1969          * @param string &$before set to everything before the ':'
1970          * @param string &$after set to everything after the ':'
1971          * return string the position of the ':', or false if none found
1972          */
1973         function findColonNoLinks($str, &$before, &$after) {
1974                 # I wonder if we should make this count all tags, not just <a>
1975                 # and <span>. That would prevent us from matching a ':' that
1976                 # comes in the middle of italics other such formatting....
1977                 # -- Wil
1978                 $fname = 'Parser::findColonNoLinks';
1979                 wfProfileIn( $fname );
1980                 $pos = 0;
1981                 do {
1982                         $colon = strpos($str, ':', $pos);
1983
1984                         if ($colon !== false) {
1985                                 $before = substr($str, 0, $colon);
1986                                 $after = substr($str, $colon + 1);
1987
1988                                 # Skip any ':' within <a> or <span> pairs
1989                                 $a = substr_count($before, '<a');
1990                                 $s = substr_count($before, '<span');
1991                                 $ca = substr_count($before, '</a>');
1992                                 $cs = substr_count($before, '</span>');
1993
1994                                 if ($a <= $ca and $s <= $cs) {
1995                                         # Tags are balanced before ':'; ok
1996                                         break;
1997                                 }
1998                                 $pos = $colon + 1;
1999                         }
2000                 } while ($colon !== false);
2001                 wfProfileOut( $fname );
2002                 return $colon;
2003         }
2004
2005         /**
2006          * Return value of a magic variable (like PAGENAME)
2007          *
2008          * @private
2009          */
2010         function getVariableValue( $index ) {
2011                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2012
2013                 /**
2014                  * Some of these require message or data lookups and can be
2015                  * expensive to check many times.
2016                  */
2017                 static $varCache = array();
2018                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2019                         if ( isset( $varCache[$index] ) )
2020                                 return $varCache[$index];
2021
2022                 $ts = time();
2023                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2024
2025                 switch ( $index ) {
2026                         case MAG_CURRENTMONTH:
2027                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2028                         case MAG_CURRENTMONTHNAME:
2029                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2030                         case MAG_CURRENTMONTHNAMEGEN:
2031                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2032                         case MAG_CURRENTMONTHABBREV:
2033                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2034                         case MAG_CURRENTDAY:
2035                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2036                         case MAG_CURRENTDAY2:
2037                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2038                         case MAG_PAGENAME:
2039                                 return $this->mTitle->getText();
2040                         case MAG_PAGENAMEE:
2041                                 return $this->mTitle->getPartialURL();
2042                         case MAG_FULLPAGENAME:
2043                                 return $this->mTitle->getPrefixedText();
2044                         case MAG_FULLPAGENAMEE:
2045                                 return $this->mTitle->getPrefixedURL();
2046                         case MAG_SUBPAGENAME:
2047                                 return $this->mTitle->getSubpageText();
2048                         case MAG_SUBPAGENAMEE:
2049                                 return $this->mTitle->getSubpageUrlForm();
2050                         case MAG_BASEPAGENAME:
2051                                 return $this->mTitle->getBaseText();
2052                         case MAG_BASEPAGENAMEE:
2053                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2054                         case MAG_TALKPAGENAME:
2055                                 if( $this->mTitle->canTalk() ) {
2056                                         $talkPage = $this->mTitle->getTalkPage();
2057                                         return $talkPage->getPrefixedText();
2058                                 } else {
2059                                         return '';
2060                                 }
2061                         case MAG_TALKPAGENAMEE:
2062                                 if( $this->mTitle->canTalk() ) {
2063                                         $talkPage = $this->mTitle->getTalkPage();
2064                                         return $talkPage->getPrefixedUrl();
2065                                 } else {
2066                                         return '';
2067                                 }
2068                         case MAG_SUBJECTPAGENAME:
2069                                 $subjPage = $this->mTitle->getSubjectPage();
2070                                 return $subjPage->getPrefixedText();
2071                         case MAG_SUBJECTPAGENAMEE:
2072                                 $subjPage = $this->mTitle->getSubjectPage();
2073                                 return $subjPage->getPrefixedUrl();
2074                         case MAG_REVISIONID:
2075                                 return $this->mRevisionId;
2076                         case MAG_NAMESPACE:
2077                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2078                         case MAG_NAMESPACEE:
2079                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2080                         case MAG_TALKSPACE:
2081                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2082                         case MAG_TALKSPACEE:
2083                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2084                         case MAG_SUBJECTSPACE:
2085                                 return $this->mTitle->getSubjectNsText();
2086                         case MAG_SUBJECTSPACEE:
2087                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2088                         case MAG_CURRENTDAYNAME:
2089                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2090                         case MAG_CURRENTYEAR:
2091                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2092                         case MAG_CURRENTTIME:
2093                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2094                         case MAG_CURRENTWEEK:
2095                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2096                                 // int to remove the padding
2097                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2098                         case MAG_CURRENTDOW:
2099                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2100                         case MAG_NUMBEROFARTICLES:
2101                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2102                         case MAG_NUMBEROFFILES:
2103                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2104                         case MAG_NUMBEROFUSERS:
2105                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfUsers() );
2106                         case MAG_NUMBEROFPAGES:
2107                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfPages() );
2108                         case MAG_CURRENTTIMESTAMP:
2109                                 return $varCache[$index] = wfTimestampNow();
2110                         case MAG_CURRENTVERSION:
2111                                 global $wgVersion;
2112                                 return $wgVersion;
2113                         case MAG_SITENAME:
2114                                 return $wgSitename;
2115                         case MAG_SERVER:
2116                                 return $wgServer;
2117                         case MAG_SERVERNAME:
2118                                 return $wgServerName;
2119                         case MAG_SCRIPTPATH:
2120                                 return $wgScriptPath;
2121                         case MAG_DIRECTIONMARK:
2122                                 return $wgContLang->getDirMark();
2123                         default:
2124                                 $ret = null;
2125                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2126                                         return $ret;
2127                                 else
2128                                         return null;
2129                 }
2130         }
2131
2132         /**
2133          * initialise the magic variables (like CURRENTMONTHNAME)
2134          *
2135          * @private
2136          */
2137         function initialiseVariables() {
2138                 $fname = 'Parser::initialiseVariables';
2139                 wfProfileIn( $fname );
2140                 global $wgVariableIDs;
2141                 $this->mVariables = array();
2142                 foreach ( $wgVariableIDs as $id ) {
2143                         $mw =& MagicWord::get( $id );
2144                         $mw->addToArray( $this->mVariables, $id );
2145                 }
2146                 wfProfileOut( $fname );
2147         }
2148
2149         /**
2150          * parse any parentheses in format ((title|part|part))
2151          * and call callbacks to get a replacement text for any found piece
2152          *
2153          * @param string $text The text to parse
2154          * @param array $callbacks rules in form:
2155          *     '{' => array(                            # opening parentheses
2156          *                                      'end' => '}',   # closing parentheses
2157          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2158          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2159          *                                                                )
2160          *                                      )
2161          * @private
2162          */
2163         function replace_callback ($text, $callbacks) {
2164                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2165                 $lastOpeningBrace = -1;                 # last not closed parentheses
2166
2167                 for ($i = 0; $i < strlen($text); $i++) {
2168                         # check for any opening brace
2169                         $rule = null;
2170                         $nextPos = -1;
2171                         foreach ($callbacks as $key => $value) {
2172                                 $pos = strpos ($text, $key, $i);
2173                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2174                                         $rule = $value;
2175                                         $nextPos = $pos;
2176                                 }
2177                         }
2178
2179                         if ($lastOpeningBrace >= 0) {
2180                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2181
2182                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2183                                         $rule = null;
2184                                         $nextPos = $pos;
2185                                 }
2186
2187                                 $pos = strpos ($text, '|', $i);
2188
2189                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2190                                         $rule = null;
2191                                         $nextPos = $pos;
2192                                 }
2193                         }
2194
2195                         if ($nextPos == -1)
2196                                 break;
2197
2198                         $i = $nextPos;
2199
2200                         # found openning brace, lets add it to parentheses stack
2201                         if (null != $rule) {
2202                                 $piece = array('brace' => $text[$i],
2203                                                            'braceEnd' => $rule['end'],
2204                                                            'count' => 1,
2205                                                            'title' => '',
2206                                                            'parts' => null);
2207
2208                                 # count openning brace characters
2209                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2210                                         $piece['count']++;
2211                                         $i++;
2212                                 }
2213
2214                                 $piece['startAt'] = $i+1;
2215                                 $piece['partStart'] = $i+1;
2216
2217                                 # we need to add to stack only if openning brace count is enough for any given rule
2218                                 foreach ($rule['cb'] as $cnt => $fn) {
2219                                         if ($piece['count'] >= $cnt) {
2220                                                 $lastOpeningBrace ++;
2221                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2222                                                 break;
2223                                         }
2224                                 }
2225
2226                                 continue;
2227                         }
2228                         else if ($lastOpeningBrace >= 0) {
2229                                 # first check if it is a closing brace
2230                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2231                                         # lets check if it is enough characters for closing brace
2232                                         $count = 1;
2233                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2234                                                 $count++;
2235
2236                                         # if there are more closing parentheses than opening ones, we parse less
2237                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2238                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2239
2240                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2241                                         $matchingCount = 0;
2242                                         $matchingCallback = null;
2243                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2244                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2245                                                         $matchingCount = $cnt;
2246                                                         $matchingCallback = $fn;
2247                                                 }
2248                                         }
2249
2250                                         if ($matchingCount == 0) {
2251                                                 $i += $count - 1;
2252                                                 continue;
2253                                         }
2254
2255                                         # lets set a title or last part (if '|' was found)
2256                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2257                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2258                                         else
2259                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2260
2261                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2262                                         $pieceEnd = $i + $matchingCount;
2263
2264                                         if( is_callable( $matchingCallback ) ) {
2265                                                 $cbArgs = array (
2266                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2267                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2268                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2269                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2270                                                                                  );
2271                                                 # finally we can call a user callback and replace piece of text
2272                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2273                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2274                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2275                                         }
2276                                         else {
2277                                                 # null value for callback means that parentheses should be parsed, but not replaced
2278                                                 $i += $matchingCount - 1;
2279                                         }
2280
2281                                         # reset last openning parentheses, but keep it in case there are unused characters
2282                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2283                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2284                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2285                                                                    'title' => '',
2286                                                                    'parts' => null,
2287                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2288                                         $openingBraceStack[$lastOpeningBrace--] = null;
2289
2290                                         if ($matchingCount < $piece['count']) {
2291                                                 $piece['count'] -= $matchingCount;
2292                                                 $piece['startAt'] -= $matchingCount;
2293                                                 $piece['partStart'] = $piece['startAt'];
2294                                                 # do we still qualify for any callback with remaining count?
2295                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2296                                                         if ($piece['count'] >= $cnt) {
2297                                                                 $lastOpeningBrace ++;
2298                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2299                                                                 break;
2300                                                         }
2301                                                 }
2302                                         }
2303                                         continue;
2304                                 }
2305
2306                                 # lets set a title if it is a first separator, or next part otherwise
2307                                 if ($text[$i] == '|') {
2308                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2309                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2310                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2311                                         }
2312                                         else
2313                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2314
2315                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2316                                 }
2317                         }
2318                 }
2319
2320                 return $text;
2321         }
2322
2323         /**
2324          * Replace magic variables, templates, and template arguments
2325          * with the appropriate text. Templates are substituted recursively,
2326          * taking care to avoid infinite loops.
2327          *
2328          * Note that the substitution depends on value of $mOutputType:
2329          *  OT_WIKI: only {{subst:}} templates
2330          *  OT_MSG: only magic variables
2331          *  OT_HTML: all templates and magic variables
2332          *
2333          * @param string $tex The text to transform
2334          * @param array $args Key-value pairs representing template parameters to substitute
2335          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2336          * @private
2337          */
2338         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2339                 # Prevent too big inclusions
2340                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2341                         return $text;
2342                 }
2343
2344                 $fname = 'Parser::replaceVariables';
2345                 wfProfileIn( $fname );
2346
2347                 # This function is called recursively. To keep track of arguments we need a stack:
2348                 array_push( $this->mArgStack, $args );
2349
2350                 $braceCallbacks = array();
2351                 if ( !$argsOnly ) {
2352                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2353                 }
2354                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2355                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2356                 }
2357                 $callbacks = array();
2358                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2359                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2360                 $text = $this->replace_callback ($text, $callbacks);
2361
2362                 array_pop( $this->mArgStack );
2363
2364                 wfProfileOut( $fname );
2365                 return $text;
2366         }
2367
2368         /**
2369          * Replace magic variables
2370          * @private
2371          */
2372         function variableSubstitution( $matches ) {
2373                 $fname = 'Parser::variableSubstitution';
2374                 $varname = $matches[1];
2375                 wfProfileIn( $fname );
2376                 if ( !$this->mVariables ) {
2377                         $this->initialiseVariables();
2378                 }
2379                 $skip = false;
2380                 if ( $this->mOutputType == OT_WIKI ) {
2381                         # Do only magic variables prefixed by SUBST
2382                         $mwSubst =& MagicWord::get( MAG_SUBST );
2383                         if (!$mwSubst->matchStartAndRemove( $varname ))
2384                                 $skip = true;
2385                         # Note that if we don't substitute the variable below,
2386                         # we don't remove the {{subst:}} magic word, in case
2387                         # it is a template rather than a magic variable.
2388                 }
2389                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2390                         $id = $this->mVariables[$varname];
2391                         $text = $this->getVariableValue( $id );
2392                         $this->mOutput->mContainsOldMagic = true;
2393                 } else {
2394                         $text = $matches[0];
2395                 }
2396                 wfProfileOut( $fname );
2397                 return $text;
2398         }
2399
2400         # Split template arguments
2401         function getTemplateArgs( $argsString ) {
2402                 if ( $argsString === '' ) {
2403                         return array();
2404                 }
2405
2406                 $args = explode( '|', substr( $argsString, 1 ) );
2407
2408                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2409                 # merged with the next arg because the '|' character between belongs
2410                 # to the link syntax and not the template parameter syntax.
2411                 $argc = count($args);
2412
2413                 for ( $i = 0; $i < $argc-1; $i++ ) {
2414                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2415                                 $args[$i] .= '|'.$args[$i+1];
2416                                 array_splice($args, $i+1, 1);
2417                                 $i--;
2418                                 $argc--;
2419                         }
2420                 }
2421
2422                 return $args;
2423         }
2424
2425         /**
2426          * Return the text of a template, after recursively
2427          * replacing any variables or templates within the template.
2428          *
2429          * @param array $piece The parts of the template
2430          *  $piece['text']: matched text
2431          *  $piece['title']: the title, i.e. the part before the |
2432          *  $piece['parts']: the parameter array
2433          * @return string the text of the template
2434          * @private
2435          */
2436         function braceSubstitution( $piece ) {
2437                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $action;
2438                 $fname = 'Parser::braceSubstitution';
2439                 wfProfileIn( $fname );
2440
2441                 # Flags
2442                 $found = false;             # $text has been filled
2443                 $nowiki = false;            # wiki markup in $text should be escaped
2444                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2445                 $noargs = false;            # Don't replace triple-brace arguments in $text
2446                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2447                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2448                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2449
2450                 # Title object, where $text came from
2451                 $title = NULL;
2452
2453                 $linestart = '';
2454
2455                 # $part1 is the bit before the first |, and must contain only title characters
2456                 # $args is a list of arguments, starting from index 0, not including $part1
2457
2458                 $part1 = $piece['title'];
2459                 # If the third subpattern matched anything, it will start with |
2460
2461                 if (null == $piece['parts']) {
2462                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2463                         if ($replaceWith != $piece['text']) {
2464                                 $text = $replaceWith;
2465                                 $found = true;
2466                                 $noparse = true;
2467                                 $noargs = true;
2468                         }
2469                 }
2470
2471                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2472                 $argc = count( $args );
2473
2474                 # SUBST
2475                 if ( !$found ) {
2476                         $mwSubst =& MagicWord::get( MAG_SUBST );
2477                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2478                                 # One of two possibilities is true:
2479                                 # 1) Found SUBST but not in the PST phase
2480                                 # 2) Didn't find SUBST and in the PST phase
2481                                 # In either case, return without further processing
2482                                 $text = $piece['text'];
2483                                 $found = true;
2484                                 $noparse = true;
2485                                 $noargs = true;
2486                         }
2487                 }
2488
2489                 # MSG, MSGNW, INT and RAW
2490                 if ( !$found ) {
2491                         # Check for MSGNW:
2492                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2493                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2494                                 $nowiki = true;
2495                         } else {
2496                                 # Remove obsolete MSG:
2497                                 $mwMsg =& MagicWord::get( MAG_MSG );
2498                                 $mwMsg->matchStartAndRemove( $part1 );
2499                         }
2500
2501                         # Check for RAW:
2502                         $mwRaw =& MagicWord::get( MAG_RAW );
2503                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2504                                 $forceRawInterwiki = true;
2505                         }
2506
2507                         # Check if it is an internal message
2508                         $mwInt =& MagicWord::get( MAG_INT );
2509                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2510                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2511                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2512                                         $found = true;
2513                                 }
2514                         }
2515                 }
2516
2517                 # NS
2518                 if ( !$found ) {
2519                         # Check for NS: (namespace expansion)
2520                         $mwNs = MagicWord::get( MAG_NS );
2521                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2522                                 if ( intval( $part1 ) || $part1 == "0" ) {
2523                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2524                                         $found = true;
2525                                 } else {
2526                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2527                                         if ( !is_null( $index ) ) {
2528                                                 $text = $linestart . $wgContLang->getNsText( $index );
2529                                                 $found = true;
2530                                         }
2531                                 }
2532                         }
2533                 }
2534
2535                 # URLENCODE
2536                 if( !$found ) {
2537                         $urlencode =& MagicWord::get( MAG_URLENCODE );
2538                         if( $urlencode->matchStartAndRemove( $part1 ) ) {
2539                                 $text = $linestart . urlencode( $part1 );
2540                                 $found = true;
2541                         }
2542                 }
2543
2544                 # LCFIRST, UCFIRST, LC and UC
2545                 if ( !$found ) {
2546                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2547                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2548                         $lc =& MagicWord::get( MAG_LC );
2549                         $uc =& MagicWord::get( MAG_UC );
2550                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2551                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2552                                 $found = true;
2553                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2554                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2555                                 $found = true;
2556                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2557                                 $text = $linestart . $wgContLang->lc( $part1 );
2558                                 $found = true;
2559                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2560                                  $text = $linestart . $wgContLang->uc( $part1 );
2561                                  $found = true;
2562                         }
2563                 }
2564
2565                 # LOCALURL and FULLURL
2566                 if ( !$found ) {
2567                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2568                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2569                         $mwFull =& MagicWord::get( MAG_FULLURL );
2570                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2571
2572
2573                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2574                                 $func = 'getLocalURL';
2575                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2576                                 $func = 'escapeLocalURL';
2577                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2578                                 $func = 'getFullURL';
2579                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2580                                 $func = 'escapeFullURL';
2581                         } else {
2582                                 $func = false;
2583                         }
2584
2585                         if ( $func !== false ) {
2586                                 $title = Title::newFromText( $part1 );
2587                                 # Due to order of execution of a lot of bits, the values might be encoded
2588                                 # before arriving here; if that's true, then the title can't be created
2589                                 # and the variable will fail. If we can't get a decent title from the first
2590                                 # attempt, url-decode and try for a second.
2591                                 if( is_null( $title ) )
2592                                         $title = Title::newFromUrl( urldecode( $part1 ) );
2593                                 if ( !is_null( $title ) ) {
2594                                         if ( $argc > 0 ) {
2595                                                 $text = $linestart . $title->$func( $args[0] );
2596                                         } else {
2597                                                 $text = $linestart . $title->$func();
2598                                         }
2599                                         $found = true;
2600                                 }
2601                         }
2602                 }
2603
2604                 $lang = $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
2605                 # GRAMMAR
2606                 if ( !$found && $argc == 1 ) {
2607                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2608                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2609                                 $text = $linestart . $lang->convertGrammar( $args[0], $part1 );
2610                                 $found = true;
2611                         }
2612                 }
2613
2614                 # PLURAL
2615                 if ( !$found && $argc >= 2 ) {
2616                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2617                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2618                                 if ($argc==2) {$args[2]=$args[1];}
2619                                 $text = $linestart . $lang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2620                                 $found = true;
2621                         }
2622                 }
2623
2624                 # DISPLAYTITLE
2625                 if ( !$found && $argc == 1 && $wgAllowDisplayTitle ) {
2626                         $mwDT =& MagicWord::get( MAG_DISPLAYTITLE );
2627                         if ( $mwDT->matchStartAndRemove( $part1 ) ) {
2628
2629                                 # Set title in parser output object
2630                                 $param = $args[0];
2631                                 $parserOptions = new ParserOptions;
2632                                 $local_parser = new Parser ();
2633                                 $t2 = $local_parser->parse ( $param, $this->mTitle, $parserOptions, false );
2634                                 $this->mOutput->mHTMLtitle = $t2->GetText();
2635
2636                                 # Add subtitle
2637                                 $t = $this->mTitle->getPrefixedText();
2638                                 $this->mOutput->mSubtitle .= wfMsg('displaytitle', $t);
2639                                 $text = "" ;
2640                                 $found = true ;
2641                         }
2642                 }
2643
2644                 # NUMBEROFPAGES, NUMBEROFUSERS, NUMBEROFARTICLES, and NUMBEROFFILES
2645                 if( !$found ) {
2646                         $mwWordsToCheck = array( MAG_NUMBEROFPAGES => 'wfNumberOfPages',
2647                                                                          MAG_NUMBEROFUSERS => 'wfNumberOfUsers',
2648                                                                          MAG_NUMBEROFARTICLES => 'wfNumberOfArticles',
2649                                                                          MAG_NUMBEROFFILES => 'wfNumberOfFiles' );
2650                         foreach( $mwWordsToCheck as $word => $func ) {
2651                                 $mwCurrentWord =& MagicWord::get( $word );
2652                                 if( $mwCurrentWord->matchStartAndRemove( $part1 ) ) {
2653                                         $mwRawSuffix =& MagicWord::get( MAG_RAWSUFFIX );
2654                                         if( $mwRawSuffix->match( $args[0] ) ) {
2655                                                 # Raw and unformatted
2656                                                 $text = $linestart . call_user_func( $func );
2657                                         } else {
2658                                                 # Formatted according to the content default
2659                                                 $text = $linestart . $wgContLang->formatNum( call_user_func( $func ) );
2660                                         }
2661                                         $found = true;
2662                                 }
2663                         }
2664                 }
2665
2666                 # #LANGUAGE:
2667                 if( !$found ) {
2668                         $mwLanguage =& MagicWord::get( MAG_LANGUAGE );
2669                         if( $mwLanguage->matchStartAndRemove( $part1 ) ) {
2670                                 $lang = $wgContLang->getLanguageName( strtolower( $part1 ) );
2671                                 $text = $linestart . ( $lang != '' ? $lang : $part1 );
2672                                 $found = true;
2673                         }
2674                 }
2675
2676                 # Extensions
2677                 if ( !$found && substr( $part1, 0, 1 ) == '#' ) {
2678                         $colonPos = strpos( $part1, ':' );
2679                         if ( $colonPos !== false ) {
2680                                 $function = strtolower( substr( $part1, 1, $colonPos - 1 ) );
2681                                 if ( isset( $this->mFunctionHooks[$function] ) ) {
2682                                         $funcArgs = array_map( 'trim', $args );
2683                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2684                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2685                                         $found = true;
2686
2687                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2688                                         //$noargs = true;
2689                                         //$noparse = true;
2690
2691                                         if ( is_array( $result ) ) {
2692                                                 $text = $linestart . $result[0];
2693                                                 unset( $result[0] );
2694
2695                                                 // Extract flags into the local scope
2696                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2697                                                 extract( $result );
2698                                         } else {
2699                                                 $text = $linestart . $result;
2700                                         }
2701                                 }
2702                         }
2703                 }
2704
2705                 # Template table test
2706
2707                 # Did we encounter this template already? If yes, it is in the cache
2708                 # and we need to check for loops.
2709                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2710                         $found = true;
2711
2712                         # Infinite loop test
2713                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2714                                 $noparse = true;
2715                                 $noargs = true;
2716                                 $found = true;
2717                                 $text = $linestart .
2718                                         '{{' . $part1 . '}}' .
2719                                         '<!-- WARNING: template loop detected -->';
2720                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2721                         } else {
2722                                 # set $text to cached message.
2723                                 $text = $linestart . $this->mTemplates[$piece['title']];
2724                         }
2725                 }
2726
2727                 # Load from database
2728                 $lastPathLevel = $this->mTemplatePath;
2729                 if ( !$found ) {
2730                         $ns = NS_TEMPLATE;
2731                         # declaring $subpage directly in the function call
2732                         # does not work correctly with references and breaks
2733                         # {{/subpage}}-style inclusions
2734                         $subpage = '';
2735                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2736                         if ($subpage !== '') {
2737                                 $ns = $this->mTitle->getNamespace();
2738                         }
2739                         $title = Title::newFromText( $part1, $ns );
2740
2741                         if ( !is_null( $title ) ) {
2742                                 if ( !$title->isExternal() ) {
2743                                         # Check for excessive inclusion
2744                                         $dbk = $title->getPrefixedDBkey();
2745                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2746                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->mOutputType != OT_WIKI ) {
2747                                                         $text = SpecialPage::capturePath( $title );
2748                                                         if ( is_string( $text ) ) {
2749                                                                 $found = true;
2750                                                                 $noparse = true;
2751                                                                 $noargs = true;
2752                                                                 $isHTML = true;
2753                                                                 $this->disableCache();
2754                                                         }
2755                                                 } else {
2756                                                         $articleContent = $this->fetchTemplate( $title );
2757                                                         if ( $articleContent !== false ) {
2758                                                                 $found = true;
2759                                                                 $text = $articleContent;
2760                                                                 $replaceHeadings = true;
2761                                                         }
2762                                                 }
2763                                         }
2764
2765                                         # If the title is valid but undisplayable, make a link to it
2766                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2767                                                 $text = '[['.$title->getPrefixedText().']]';
2768                                                 $found = true;
2769                                         }
2770                                 } elseif ( $title->isTrans() ) {
2771                                         // Interwiki transclusion
2772                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2773                                                 $text = $this->interwikiTransclude( $title, 'render' );
2774                                                 $isHTML = true;
2775                                                 $noparse = true;
2776                                         } else {
2777                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2778                                                 $replaceHeadings = true;
2779                                         }
2780                                         $found = true;
2781                                 }
2782
2783                                 # Template cache array insertion
2784                                 # Use the original $piece['title'] not the mangled $part1, so that
2785                                 # modifiers such as RAW: produce separate cache entries
2786                                 if( $found ) {
2787                                         $this->mTemplates[$piece['title']] = $text;
2788                                         $text = $linestart . $text;
2789                                 }
2790                         }
2791                 }
2792
2793                 # Recursive parsing, escaping and link table handling
2794                 # Only for HTML output
2795                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2796                         $text = wfEscapeWikiText( $text );
2797                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2798                         if ( $noargs ) {
2799                                 $assocArgs = array();
2800                         } else {
2801                                 # Clean up argument array
2802                                 $assocArgs = array();
2803                                 $index = 1;
2804                                 foreach( $args as $arg ) {
2805                                         $eqpos = strpos( $arg, '=' );
2806                                         if ( $eqpos === false ) {
2807                                                 $assocArgs[$index++] = $arg;
2808                                         } else {
2809                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2810                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2811                                                 if ( $value === false ) {
2812                                                         $value = '';
2813                                                 }
2814                                                 if ( $name !== false ) {
2815                                                         $assocArgs[$name] = $value;
2816                                                 }
2817                                         }
2818                                 }
2819
2820                                 # Add a new element to the templace recursion path
2821                                 $this->mTemplatePath[$part1] = 1;
2822                         }
2823
2824                         if ( !$noparse ) {
2825                                 # If there are any <onlyinclude> tags, only include them
2826                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2827                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2828                                         $text = '';
2829                                         foreach ($m[1] as $piece)
2830                                                 $text .= $piece;
2831                                 }
2832                                 # Remove <noinclude> sections and <includeonly> tags
2833                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2834                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2835
2836                                 if( $this->mOutputType == OT_HTML ) {
2837                                         # Strip <nowiki>, <pre>, etc.
2838                                         $text = $this->strip( $text, $this->mStripState );
2839                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2840                                 }
2841                                 $text = $this->replaceVariables( $text, $assocArgs );
2842
2843                                 # If the template begins with a table or block-level
2844                                 # element, it should be treated as beginning a new line.
2845                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2846                                         $text = "\n" . $text;
2847                                 }
2848                         } elseif ( !$noargs ) {
2849                                 # $noparse and !$noargs
2850                                 # Just replace the arguments, not any double-brace items
2851                                 # This is used for rendered interwiki transclusion
2852                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2853                         }
2854                 }
2855                 # Prune lower levels off the recursion check path
2856                 $this->mTemplatePath = $lastPathLevel;
2857
2858                 if ( !$found ) {
2859                         wfProfileOut( $fname );
2860                         return $piece['text'];
2861                 } else {
2862                         if ( $isHTML ) {
2863                                 # Replace raw HTML by a placeholder
2864                                 # Add a blank line preceding, to prevent it from mucking up
2865                                 # immediately preceding headings
2866                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2867                         } else {
2868                                 # replace ==section headers==
2869                                 # XXX this needs to go away once we have a better parser.
2870                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2871                                         if( !is_null( $title ) )
2872                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2873                                         else
2874                                                 $encodedname = base64_encode("");
2875                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2876                                                 PREG_SPLIT_DELIM_CAPTURE);
2877                                         $text = '';
2878                                         $nsec = 0;
2879                                         for( $i = 0; $i < count($m); $i += 2 ) {
2880                                                 $text .= $m[$i];
2881                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2882                                                 $hl = $m[$i + 1];
2883                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2884                                                         $text .= $hl;
2885                                                         continue;
2886                                                 }
2887                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2888                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2889                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2890
2891                                                 $nsec++;
2892                                         }
2893                                 }
2894                         }
2895                 }
2896
2897                 # Prune lower levels off the recursion check path
2898                 $this->mTemplatePath = $lastPathLevel;
2899
2900                 if ( !$found ) {
2901                         wfProfileOut( $fname );
2902                         return $piece['text'];
2903                 } else {
2904                         wfProfileOut( $fname );
2905                         return $text;
2906                 }
2907         }
2908
2909         /**
2910          * Fetch the unparsed text of a template and register a reference to it.
2911          */
2912         function fetchTemplate( $title ) {
2913                 $text = false;
2914                 // Loop to fetch the article, with up to 1 redirect
2915                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
2916                         $rev = Revision::newFromTitle( $title );
2917                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
2918                         if ( !$rev ) {
2919                                 break;
2920                         }
2921                         $text = $rev->getText();
2922                         if ( $text === false ) {
2923                                 break;
2924                         }
2925                         // Redirect?
2926                         $title = Title::newFromRedirect( $text );
2927                 }
2928                 return $text;
2929         }
2930
2931         /**
2932          * Transclude an interwiki link.
2933          */
2934         function interwikiTransclude( $title, $action ) {
2935                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
2936
2937                 if (!$wgEnableScaryTranscluding)
2938                         return wfMsg('scarytranscludedisabled');
2939
2940                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
2941                 // But we'll handle it generally anyway
2942                 if ( $title->getNamespace() ) {
2943                         // Use the canonical namespace, which should work anywhere
2944                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
2945                 } else {
2946                         $articleName = $title->getDBkey();
2947                 }
2948
2949                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
2950                 $url .= "?action=$action";
2951                 if (strlen($url) > 255)
2952                         return wfMsg('scarytranscludetoolong');
2953                 return $this->fetchScaryTemplateMaybeFromCache($url);
2954         }
2955
2956         function fetchScaryTemplateMaybeFromCache($url) {
2957                 global $wgTranscludeCacheExpiry;
2958                 $dbr =& wfGetDB(DB_SLAVE);
2959                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2960                                 array('tc_url' => $url));
2961                 if ($obj) {
2962                         $time = $obj->tc_time;
2963                         $text = $obj->tc_contents;
2964                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
2965                                 return $text;
2966                         }
2967                 }
2968
2969                 $text = wfGetHTTP($url);
2970                 if (!$text)
2971                         return wfMsg('scarytranscludefailed', $url);
2972
2973                 $dbw =& wfGetDB(DB_MASTER);
2974                 $dbw->replace('transcache', array('tc_url'), array(
2975                         'tc_url' => $url,
2976                         'tc_time' => time(),
2977                         'tc_contents' => $text));
2978                 return $text;
2979         }
2980
2981
2982         /**
2983          * Triple brace replacement -- used for template arguments
2984          * @private
2985          */
2986         function argSubstitution( $matches ) {
2987                 $arg = trim( $matches['title'] );
2988                 $text = $matches['text'];
2989                 $inputArgs = end( $this->mArgStack );
2990
2991                 if ( array_key_exists( $arg, $inputArgs ) ) {
2992                         $text = $inputArgs[$arg];
2993                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
2994                         $text = $matches['parts'][0];
2995                 }
2996
2997                 return $text;
2998         }
2999
3000         /**
3001          * Returns true if the function is allowed to include this entity
3002          * @private
3003          */
3004         function incrementIncludeCount( $dbk ) {
3005                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
3006                         $this->mIncludeCount[$dbk] = 0;
3007                 }
3008                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
3009                         return true;
3010                 } else {
3011                         return false;
3012                 }
3013         }
3014
3015         /**
3016          * Detect __TOC__ magic word and set a placeholder
3017          */
3018         function stripToc( $text ) {
3019                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3020                 # do not add TOC
3021                 $mw = MagicWord::get( MAG_NOTOC );
3022                 if( $mw->matchAndRemove( $text ) ) {
3023                         $this->mShowToc = false;
3024                 }
3025
3026                 $mw = MagicWord::get( MAG_TOC );
3027                 if( $mw->match( $text ) ) {
3028                         $this->mShowToc = true;
3029                         $this->mForceTocPosition = true;
3030
3031                         // Set a placeholder. At the end we'll fill it in with the TOC.
3032                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3033
3034                         // Only keep the first one.
3035                         $text = $mw->replace( '', $text );
3036                 }
3037                 return $text;
3038         }
3039
3040         /**
3041          * This function accomplishes several tasks:
3042          * 1) Auto-number headings if that option is enabled
3043          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3044          * 3) Add a Table of contents on the top for users who have enabled the option
3045          * 4) Auto-anchor headings
3046          *
3047          * It loops through all headlines, collects the necessary data, then splits up the
3048          * string and re-inserts the newly formatted headlines.
3049          *
3050          * @param string $text
3051          * @param boolean $isMain
3052          * @private
3053          */
3054         function formatHeadings( $text, $isMain=true ) {
3055                 global $wgMaxTocLevel, $wgContLang;
3056
3057                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3058                 if( !$this->mTitle->userCanEdit() ) {
3059                         $showEditLink = 0;
3060                 } else {
3061                         $showEditLink = $this->mOptions->getEditSection();
3062                 }
3063
3064                 # Inhibit editsection links if requested in the page
3065                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
3066                 if( $esw->matchAndRemove( $text ) ) {
3067                         $showEditLink = 0;
3068                 }
3069
3070                 # Get all headlines for numbering them and adding funky stuff like [edit]
3071                 # links - this is for later, but we need the number of headlines right now
3072                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3073
3074                 # if there are fewer than 4 headlines in the article, do not show TOC
3075                 # unless it's been explicitly enabled.
3076                 $enoughToc = $this->mShowToc &&
3077                         (($numMatches >= 4) || $this->mForceTocPosition);
3078
3079                 # Allow user to stipulate that a page should have a "new section"
3080                 # link added via __NEWSECTIONLINK__
3081                 $mw =& MagicWord::get( MAG_NEWSECTIONLINK );
3082                 if( $mw->matchAndRemove( $text ) )
3083                         $this->mOutput->setNewSection( true );
3084
3085                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3086                 # override above conditions and always show TOC above first header
3087                 $mw =& MagicWord::get( MAG_FORCETOC );
3088                 if ($mw->matchAndRemove( $text ) ) {
3089                         $this->mShowToc = true;
3090                         $enoughToc = true;
3091                 }
3092
3093                 # Never ever show TOC if no headers
3094                 if( $numMatches < 1 ) {
3095                         $enoughToc = false;
3096                 }
3097
3098                 # We need this to perform operations on the HTML
3099                 $sk =& $this->mOptions->getSkin();
3100
3101                 # headline counter
3102                 $headlineCount = 0;
3103                 $sectionCount = 0; # headlineCount excluding template sections
3104
3105                 # Ugh .. the TOC should have neat indentation levels which can be
3106                 # passed to the skin functions. These are determined here
3107                 $toc = '';
3108                 $full = '';
3109                 $head = array();
3110                 $sublevelCount = array();
3111                 $levelCount = array();
3112                 $toclevel = 0;
3113                 $level = 0;
3114                 $prevlevel = 0;
3115                 $toclevel = 0;
3116                 $prevtoclevel = 0;
3117
3118                 foreach( $matches[3] as $headline ) {
3119                         $istemplate = 0;
3120                         $templatetitle = '';
3121                         $templatesection = 0;
3122                         $numbering = '';
3123
3124                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3125                                 $istemplate = 1;
3126                                 $templatetitle = base64_decode($mat[1]);
3127                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3128                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3129                         }
3130
3131                         if( $toclevel ) {
3132                                 $prevlevel = $level;
3133                                 $prevtoclevel = $toclevel;
3134                         }
3135                         $level = $matches[1][$headlineCount];
3136
3137                         if( $doNumberHeadings || $enoughToc ) {
3138
3139                                 if ( $level > $prevlevel ) {
3140                                         # Increase TOC level
3141                                         $toclevel++;
3142                                         $sublevelCount[$toclevel] = 0;
3143                                         if( $toclevel<$wgMaxTocLevel ) {
3144                                                 $toc .= $sk->tocIndent();
3145                                         }
3146                                 }
3147                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3148                                         # Decrease TOC level, find level to jump to
3149
3150                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3151                                                 # Can only go down to level 1
3152                                                 $toclevel = 1;
3153                                         } else {
3154                                                 for ($i = $toclevel; $i > 0; $i--) {
3155                                                         if ( $levelCount[$i] == $level ) {
3156                                                                 # Found last matching level
3157                                                                 $toclevel = $i;
3158                                                                 break;
3159                                                         }
3160                                                         elseif ( $levelCount[$i] < $level ) {
3161                                                                 # Found first matching level below current level
3162                                                                 $toclevel = $i + 1;
3163                                                                 break;
3164                                                         }
3165                                                 }
3166                                         }
3167                                         if( $toclevel<$wgMaxTocLevel ) {
3168                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3169                                         }
3170                                 }
3171                                 else {
3172                                         # No change in level, end TOC line
3173                                         if( $toclevel<$wgMaxTocLevel ) {
3174                                                 $toc .= $sk->tocLineEnd();
3175                                         }
3176                                 }
3177
3178                                 $levelCount[$toclevel] = $level;
3179
3180                                 # count number of headlines for each level
3181                                 @$sublevelCount[$toclevel]++;
3182                                 $dot = 0;
3183                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3184                                         if( !empty( $sublevelCount[$i] ) ) {
3185                                                 if( $dot ) {
3186                                                         $numbering .= '.';
3187                                                 }
3188                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3189                                                 $dot = 1;
3190                                         }
3191                                 }
3192                         }
3193
3194                         # The canonized header is a version of the header text safe to use for links
3195                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3196                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3197                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3198
3199                         # Remove link placeholders by the link text.
3200                         #     <!--LINK number-->
3201                         # turns into
3202                         #     link text with suffix
3203                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3204                                                             "\$this->mLinkHolders['texts'][\$1]",
3205                                                             $canonized_headline );
3206                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3207                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3208                                                             $canonized_headline );
3209
3210                         # strip out HTML
3211                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3212                         $tocline = trim( $canonized_headline );
3213                         # Save headline for section edit hint before it's escaped
3214                         $headline_hint = trim( $canonized_headline );
3215                         $canonized_headline = Sanitizer::escapeId( $tocline );
3216                         $refers[$headlineCount] = $canonized_headline;
3217
3218                         # count how many in assoc. array so we can track dupes in anchors
3219                         @$refers[$canonized_headline]++;
3220                         $refcount[$headlineCount]=$refers[$canonized_headline];
3221
3222                         # Don't number the heading if it is the only one (looks silly)
3223                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3224                                 # the two are different if the line contains a link
3225                                 $headline=$numbering . ' ' . $headline;
3226                         }
3227
3228                         # Create the anchor for linking from the TOC to the section
3229                         $anchor = $canonized_headline;
3230                         if($refcount[$headlineCount] > 1 ) {
3231                                 $anchor .= '_' . $refcount[$headlineCount];
3232                         }
3233                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3234                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3235                         }
3236                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3237                                 if ( empty( $head[$headlineCount] ) ) {
3238                                         $head[$headlineCount] = '';
3239                                 }
3240                                 if( $istemplate )
3241                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3242                                 else
3243                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3244                         }
3245
3246                         # give headline the correct <h#> tag
3247                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3248
3249                         $headlineCount++;
3250                         if( !$istemplate )
3251                                 $sectionCount++;
3252                 }
3253
3254                 if( $enoughToc ) {
3255                         if( $toclevel<$wgMaxTocLevel ) {
3256                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3257                         }
3258                         $toc = $sk->tocList( $toc );
3259                 }
3260
3261                 # split up and insert constructed headlines
3262
3263                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3264                 $i = 0;
3265
3266                 foreach( $blocks as $block ) {
3267                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3268                                 # This is the [edit] link that appears for the top block of text when
3269                                 # section editing is enabled
3270
3271                                 # Disabled because it broke block formatting
3272                                 # For example, a bullet point in the top line
3273                                 # $full .= $sk->editSectionLink(0);
3274                         }
3275                         $full .= $block;
3276                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3277                                 # Top anchor now in skin
3278                                 $full = $full.$toc;
3279                         }
3280
3281                         if( !empty( $head[$i] ) ) {
3282                                 $full .= $head[$i];
3283                         }
3284                         $i++;
3285                 }
3286                 if( $this->mForceTocPosition ) {
3287                         return str_replace( '<!--MWTOC-->', $toc, $full );
3288                 } else {
3289                         return $full;
3290                 }
3291         }
3292
3293         /**
3294          * Return an HTML link for the "ISBN 123456" text
3295          * @private
3296          */
3297         function magicISBN( $text ) {
3298                 $fname = 'Parser::magicISBN';
3299                 wfProfileIn( $fname );
3300
3301                 $a = split( 'ISBN ', ' '.$text );
3302                 if ( count ( $a ) < 2 ) {
3303                         wfProfileOut( $fname );
3304                         return $text;
3305                 }
3306                 $text = substr( array_shift( $a ), 1);
3307                 $valid = '0123456789-Xx';
3308
3309                 foreach ( $a as $x ) {
3310                         # hack: don't replace inside thumbnail title/alt
3311                         # attributes
3312                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3313                                 $text .= "ISBN $x";
3314                                 continue;
3315                         }
3316
3317                         $isbn = $blank = '' ;
3318                         while ( ' ' == $x{0} ) {
3319                                 $blank .= ' ';
3320                                 $x = substr( $x, 1 );
3321                         }
3322                         if ( $x == '' ) { # blank isbn
3323                                 $text .= "ISBN $blank";
3324                                 continue;
3325                         }
3326                         while ( strstr( $valid, $x{0} ) != false ) {
3327                                 $isbn .= $x{0};
3328                                 $x = substr( $x, 1 );
3329                         }
3330                         $num = str_replace( '-', '', $isbn );
3331                         $num = str_replace( ' ', '', $num );
3332                         $num = str_replace( 'x', 'X', $num );
3333
3334                         if ( '' == $num ) {
3335                                 $text .= "ISBN $blank$x";
3336                         } else {
3337                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3338                                 $text .= '<a href="' .
3339                                         $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3340                                         "\" class=\"internal\">ISBN $isbn</a>";
3341                                 $text .= $x;
3342                         }
3343                 }
3344                 wfProfileOut( $fname );
3345                 return $text;
3346         }
3347
3348         /**
3349          * Return an HTML link for the "RFC 1234" text
3350          *
3351          * @private
3352          * @param string $text     Text to be processed
3353          * @param string $keyword  Magic keyword to use (default RFC)
3354          * @param string $urlmsg   Interface message to use (default rfcurl)
3355          * @return string
3356          */
3357         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3358
3359                 $valid = '0123456789';
3360                 $internal = false;
3361
3362                 $a = split( $keyword, ' '.$text );
3363                 if ( count ( $a ) < 2 ) {
3364                         return $text;
3365                 }
3366                 $text = substr( array_shift( $a ), 1);
3367
3368                 /* Check if keyword is preceed by [[.
3369                  * This test is made here cause of the array_shift above
3370                  * that prevent the test to be done in the foreach.
3371                  */
3372                 if ( substr( $text, -2 ) == '[[' ) {
3373                         $internal = true;
3374                 }
3375
3376                 foreach ( $a as $x ) {
3377                         /* token might be empty if we have RFC RFC 1234 */
3378                         if ( $x=='' ) {
3379                                 $text.=$keyword;
3380                                 continue;
3381                                 }
3382
3383                         # hack: don't replace inside thumbnail title/alt
3384                         # attributes
3385                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3386                                 $text .= $keyword . $x;
3387                                 continue;
3388                         }
3389
3390                         $id = $blank = '' ;
3391
3392                         /** remove and save whitespaces in $blank */
3393                         while ( $x{0} == ' ' ) {
3394                                 $blank .= ' ';
3395                                 $x = substr( $x, 1 );
3396                         }
3397
3398                         /** remove and save the rfc number in $id */
3399                         while ( strstr( $valid, $x{0} ) != false ) {
3400                                 $id .= $x{0};
3401                                 $x = substr( $x, 1 );
3402                         }
3403
3404                         if ( $id == '' ) {
3405                                 /* call back stripped spaces*/
3406                                 $text .= $keyword.$blank.$x;
3407                         } elseif( $internal ) {
3408                                 /* normal link */
3409                                 $text .= $keyword.$id.$x;
3410                         } else {
3411                                 /* build the external link*/
3412                                 $url = wfMsg( $urlmsg, $id);
3413                                 $sk =& $this->mOptions->getSkin();
3414                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3415                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3416                         }
3417
3418                         /* Check if the next RFC keyword is preceed by [[ */
3419                         $internal = ( substr($x,-2) == '[[' );
3420                 }
3421                 return $text;
3422         }
3423
3424         /**
3425          * Transform wiki markup when saving a page by doing \r\n -> \n
3426          * conversion, substitting signatures, {{subst:}} templates, etc.
3427          *
3428          * @param string $text the text to transform
3429          * @param Title &$title the Title object for the current article
3430          * @param User &$user the User object describing the current user
3431          * @param ParserOptions $options parsing options
3432          * @param bool $clearState whether to clear the parser state first
3433          * @return string the altered wiki markup
3434          * @public
3435          */
3436         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3437                 $this->mOptions = $options;
3438                 $this->mTitle =& $title;
3439                 $this->mOutputType = OT_WIKI;
3440
3441                 if ( $clearState ) {
3442                         $this->clearState();
3443                 }
3444
3445                 $stripState = false;
3446                 $pairs = array(
3447                         "\r\n" => "\n",
3448                 );
3449                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3450                 $text = $this->strip( $text, $stripState, true );
3451                 $text = $this->pstPass2( $text, $stripState, $user );
3452                 $text = $this->unstrip( $text, $stripState );
3453                 $text = $this->unstripNoWiki( $text, $stripState );
3454                 return $text;
3455         }
3456
3457         /**
3458          * Pre-save transform helper function
3459          * @private
3460          */
3461         function pstPass2( $text, &$stripState, &$user ) {
3462                 global $wgContLang, $wgLocaltimezone;
3463
3464                 /* Note: This is the timestamp saved as hardcoded wikitext to
3465                  * the database, we use $wgContLang here in order to give
3466                  * everyone the same signature and use the default one rather
3467                  * than the one selected in each user's preferences.
3468                  */
3469                 if ( isset( $wgLocaltimezone ) ) {
3470                         $oldtz = getenv( 'TZ' );
3471                         putenv( 'TZ='.$wgLocaltimezone );
3472                 }
3473                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3474                   ' (' . date( 'T' ) . ')';
3475                 if ( isset( $wgLocaltimezone ) ) {
3476                         putenv( 'TZ='.$oldtz );
3477                 }
3478
3479                 # Variable replacement
3480                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3481                 $text = $this->replaceVariables( $text );
3482
3483                 # Strip out <nowiki> etc. added via replaceVariables
3484                 $text = $this->strip( $text, $stripState );
3485
3486                 # Signatures
3487                 $sigText = $this->getUserSig( $user );
3488                 $text = strtr( $text, array(
3489                         '~~~~~' => $d,
3490                         '~~~~' => "$sigText $d",
3491                         '~~~' => $sigText
3492                 ) );
3493
3494                 # Context links: [[|name]] and [[name (context)|]]
3495                 #
3496                 global $wgLegalTitleChars;
3497                 $tc = "[$wgLegalTitleChars]";
3498                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3499
3500                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3501                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3502
3503                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3504                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3505                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3506                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3507                 $context = '';
3508                 $t = $this->mTitle->getText();
3509                 if ( preg_match( $conpat, $t, $m ) ) {
3510                         $context = $m[2];
3511                 }
3512                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3513                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3514                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3515
3516                 if ( '' == $context ) {
3517                         $text = preg_replace( $p2, '[[\\1]]', $text );
3518                 } else {
3519                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3520                 }
3521
3522                 # Trim trailing whitespace
3523                 # MAG_END (__END__) tag allows for trailing
3524                 # whitespace to be deliberately included
3525                 $text = rtrim( $text );
3526                 $mw =& MagicWord::get( MAG_END );
3527                 $mw->matchAndRemove( $text );
3528
3529                 return $text;
3530         }
3531
3532         /**
3533          * Fetch the user's signature text, if any, and normalize to
3534          * validated, ready-to-insert wikitext.
3535          *
3536          * @param User $user
3537          * @return string
3538          * @private
3539          */
3540         function getUserSig( &$user ) {
3541                 $username = $user->getName();
3542                 $nickname = $user->getOption( 'nickname' );
3543                 $nickname = $nickname === '' ? $username : $nickname;
3544
3545                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3546                         # Sig. might contain markup; validate this
3547                         if( $this->validateSig( $nickname ) !== false ) {
3548                                 # Validated; clean up (if needed) and return it
3549                                 return $this->cleanSig( $nickname, true );
3550                         } else {
3551                                 # Failed to validate; fall back to the default
3552                                 $nickname = $username;
3553                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3554                         }
3555                 }
3556
3557                 # If we're still here, make it a link to the user page
3558                 $userpage = $user->getUserPage();
3559                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3560         }
3561
3562         /**
3563          * Check that the user's signature contains no bad XML
3564          *
3565          * @param string $text
3566          * @return mixed An expanded string, or false if invalid.
3567          */
3568         function validateSig( $text ) {
3569                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3570         }
3571
3572         /**
3573          * Clean up signature text
3574          *
3575          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3576          * 2) Substitute all transclusions
3577          *
3578          * @param string $text
3579          * @param $parsing Whether we're cleaning (preferences save) or parsing
3580          * @return string Signature text
3581          */
3582         function cleanSig( $text, $parsing = false ) {
3583                 global $wgTitle;
3584                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3585
3586                 $substWord = MagicWord::get( MAG_SUBST );
3587                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3588                 $substText = '{{' . $substWord->getSynonym( 0 );
3589
3590                 $text = preg_replace( $substRegex, $substText, $text );
3591                 $text = preg_replace( '/~{3,5}/', '', $text );
3592                 $text = $this->replaceVariables( $text );
3593
3594                 $this->clearState();
3595                 return $text;
3596         }
3597
3598         /**
3599          * Set up some variables which are usually set up in parse()
3600          * so that an external function can call some class members with confidence
3601          * @public
3602          */
3603         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3604                 $this->mTitle =& $title;
3605                 $this->mOptions = $options;
3606                 $this->mOutputType = $outputType;
3607                 if ( $clearState ) {
3608                         $this->clearState();
3609                 }
3610         }
3611
3612         /**
3613          * Transform a MediaWiki message by replacing magic variables.
3614          *
3615          * @param string $text the text to transform
3616          * @param ParserOptions $options  options
3617          * @return string the text with variables substituted
3618          * @public
3619          */
3620         function transformMsg( $text, $options ) {
3621                 global $wgTitle;
3622                 static $executing = false;
3623
3624                 $fname = "Parser::transformMsg";
3625
3626                 # Guard against infinite recursion
3627                 if ( $executing ) {
3628                         return $text;
3629                 }
3630                 $executing = true;
3631
3632                 wfProfileIn($fname);
3633
3634                 $this->mTitle = $wgTitle;
3635                 $this->mOptions = $options;
3636                 $this->mOutputType = OT_MSG;
3637                 $this->clearState();
3638                 $text = $this->replaceVariables( $text );
3639
3640                 $executing = false;
3641                 wfProfileOut($fname);
3642                 return $text;
3643         }
3644
3645         /**
3646          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3647          * The callback should have the following form:
3648          *    function myParserHook( $text, $params, &$parser ) { ... }
3649          *
3650          * Transform and return $text. Use $parser for any required context, e.g. use
3651          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3652          *
3653          * @public
3654          *
3655          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3656          * @param mixed $callback The callback function (and object) to use for the tag
3657          *
3658          * @return The old value of the mTagHooks array associated with the hook
3659          */
3660         function setHook( $tag, $callback ) {
3661                 $tag = strtolower( $tag );
3662                 $oldVal = @$this->mTagHooks[$tag];
3663                 $this->mTagHooks[$tag] = $callback;
3664
3665                 return $oldVal;
3666         }
3667
3668         /**
3669          * Create a function, e.g. {{sum:1|2|3}}
3670          * The callback function should have the form:
3671          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3672          *
3673          * The callback may either return the text result of the function, or an array with the text
3674          * in element 0, and a number of flags in the other elements. The names of the flags are
3675          * specified in the keys. Valid flags are:
3676          *   found                     The text returned is valid, stop processing the template. This
3677          *                             is on by default.
3678          *   nowiki                    Wiki markup in the return value should be escaped
3679          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3680          *   noargs                    Don't replace triple-brace arguments in the return value
3681          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3682          *
3683          * @public
3684          *
3685          * @param string $name The function name. Function names are case-insensitive.
3686          * @param mixed $callback The callback function (and object) to use
3687          *
3688          * @return The old callback function for this name, if any
3689          */
3690         function setFunctionHook( $name, $callback ) {
3691                 $name = strtolower( $name );
3692                 $oldVal = @$this->mFunctionHooks[$name];
3693                 $this->mFunctionHooks[$name] = $callback;
3694                 return $oldVal;
3695         }
3696
3697         /**
3698          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3699          * Placeholders created in Skin::makeLinkObj()
3700          * Returns an array of links found, indexed by PDBK:
3701          *  0 - broken
3702          *  1 - normal link
3703          *  2 - stub
3704          * $options is a bit field, RLH_FOR_UPDATE to select for update
3705          */
3706         function replaceLinkHolders( &$text, $options = 0 ) {
3707                 global $wgUser;
3708                 global $wgOutputReplace;
3709
3710                 $fname = 'Parser::replaceLinkHolders';
3711                 wfProfileIn( $fname );
3712
3713                 $pdbks = array();
3714                 $colours = array();
3715                 $sk =& $this->mOptions->getSkin();
3716                 $linkCache =& LinkCache::singleton();
3717
3718                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3719                         wfProfileIn( $fname.'-check' );
3720                         $dbr =& wfGetDB( DB_SLAVE );
3721                         $page = $dbr->tableName( 'page' );
3722                         $threshold = $wgUser->getOption('stubthreshold');
3723
3724                         # Sort by namespace
3725                         asort( $this->mLinkHolders['namespaces'] );
3726
3727                         # Generate query
3728                         $query = false;
3729                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3730                                 # Make title object
3731                                 $title = $this->mLinkHolders['titles'][$key];
3732
3733                                 # Skip invalid entries.
3734                                 # Result will be ugly, but prevents crash.
3735                                 if ( is_null( $title ) ) {
3736                                         continue;
3737                                 }
3738                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3739
3740                                 # Check if it's a static known link, e.g. interwiki
3741                                 if ( $title->isAlwaysKnown() ) {
3742                                         $colours[$pdbk] = 1;
3743                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3744                                         $colours[$pdbk] = 1;
3745                                         $this->mOutput->addLink( $title, $id );
3746                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3747                                         $colours[$pdbk] = 0;
3748                                 } else {
3749                                         # Not in the link cache, add it to the query
3750                                         if ( !isset( $current ) ) {
3751                                                 $current = $ns;
3752                                                 $query =  "SELECT page_id, page_namespace, page_title";
3753                                                 if ( $threshold > 0 ) {
3754                                                         $query .= ', page_len, page_is_redirect';
3755                                                 }
3756                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3757                                         } elseif ( $current != $ns ) {
3758                                                 $current = $ns;
3759                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3760                                         } else {
3761                                                 $query .= ', ';
3762                                         }
3763
3764                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3765                                 }
3766                         }
3767                         if ( $query ) {
3768                                 $query .= '))';
3769                                 if ( $options & RLH_FOR_UPDATE ) {
3770                                         $query .= ' FOR UPDATE';
3771                                 }
3772
3773                                 $res = $dbr->query( $query, $fname );
3774
3775                                 # Fetch data and form into an associative array
3776                                 # non-existent = broken
3777                                 # 1 = known
3778                                 # 2 = stub
3779                                 while ( $s = $dbr->fetchObject($res) ) {
3780                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3781                                         $pdbk = $title->getPrefixedDBkey();
3782                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3783                                         $this->mOutput->addLink( $title, $s->page_id );
3784
3785                                         if ( $threshold >  0 ) {
3786                                                 $size = $s->page_len;
3787                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3788                                                         $colours[$pdbk] = 1;
3789                                                 } else {
3790                                                         $colours[$pdbk] = 2;
3791                                                 }
3792                                         } else {
3793                                                 $colours[$pdbk] = 1;
3794                                         }
3795                                 }
3796                         }
3797                         wfProfileOut( $fname.'-check' );
3798
3799                         # Construct search and replace arrays
3800                         wfProfileIn( $fname.'-construct' );
3801                         $wgOutputReplace = array();
3802                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3803                                 $pdbk = $pdbks[$key];
3804                                 $searchkey = "<!--LINK $key-->";
3805                                 $title = $this->mLinkHolders['titles'][$key];
3806                                 if ( empty( $colours[$pdbk] ) ) {
3807                                         $linkCache->addBadLinkObj( $title );
3808                                         $colours[$pdbk] = 0;
3809                                         $this->mOutput->addLink( $title, 0 );
3810                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3811                                                                         $this->mLinkHolders['texts'][$key],
3812                                                                         $this->mLinkHolders['queries'][$key] );
3813                                 } elseif ( $colours[$pdbk] == 1 ) {
3814                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3815                                                                         $this->mLinkHolders['texts'][$key],
3816                                                                         $this->mLinkHolders['queries'][$key] );
3817                                 } elseif ( $colours[$pdbk] == 2 ) {
3818                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3819                                                                         $this->mLinkHolders['texts'][$key],
3820                                                                         $this->mLinkHolders['queries'][$key] );
3821                                 }
3822                         }
3823                         wfProfileOut( $fname.'-construct' );
3824
3825                         # Do the thing
3826                         wfProfileIn( $fname.'-replace' );
3827
3828                         $text = preg_replace_callback(
3829                                 '/(<!--LINK .*?-->)/',
3830                                 "wfOutputReplaceMatches",
3831                                 $text);
3832
3833                         wfProfileOut( $fname.'-replace' );
3834                 }
3835
3836                 # Now process interwiki link holders
3837                 # This is quite a bit simpler than internal links
3838                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3839                         wfProfileIn( $fname.'-interwiki' );
3840                         # Make interwiki link HTML
3841                         $wgOutputReplace = array();
3842                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3843                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3844                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3845                         }
3846
3847                         $text = preg_replace_callback(
3848                                 '/<!--IWLINK (.*?)-->/',
3849                                 "wfOutputReplaceMatches",
3850                                 $text );
3851                         wfProfileOut( $fname.'-interwiki' );
3852                 }
3853
3854                 wfProfileOut( $fname );
3855                 return $colours;
3856         }
3857
3858         /**
3859          * Replace <!--LINK--> link placeholders with plain text of links
3860          * (not HTML-formatted).
3861          * @param string $text
3862          * @return string
3863          */
3864         function replaceLinkHoldersText( $text ) {
3865                 $fname = 'Parser::replaceLinkHoldersText';
3866                 wfProfileIn( $fname );
3867
3868                 $text = preg_replace_callback(
3869                         '/<!--(LINK|IWLINK) (.*?)-->/',
3870                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3871                         $text );
3872
3873                 wfProfileOut( $fname );
3874                 return $text;
3875         }
3876
3877         /**
3878          * @param array $matches
3879          * @return string
3880          * @private
3881          */
3882         function replaceLinkHoldersTextCallback( $matches ) {
3883                 $type = $matches[1];
3884                 $key  = $matches[2];
3885                 if( $type == 'LINK' ) {
3886                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3887                                 return $this->mLinkHolders['texts'][$key];
3888                         }
3889                 } elseif( $type == 'IWLINK' ) {
3890                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3891                                 return $this->mInterwikiLinkHolders['texts'][$key];
3892                         }
3893                 }
3894                 return $matches[0];
3895         }
3896
3897         /**
3898          * Renders an image gallery from a text with one line per image.
3899          * text labels may be given by using |-style alternative text. E.g.
3900          *   Image:one.jpg|The number "1"
3901          *   Image:tree.jpg|A tree
3902          * given as text will return the HTML of a gallery with two images,
3903          * labeled 'The number "1"' and
3904          * 'A tree'.
3905          */
3906         function renderImageGallery( $text ) {
3907                 # Setup the parser
3908                 $parserOptions = new ParserOptions;
3909                 $localParser = new Parser();
3910
3911                 $ig = new ImageGallery();
3912                 $ig->setShowBytes( false );
3913                 $ig->setShowFilename( false );
3914                 $ig->setParsing();
3915                 $lines = explode( "\n", $text );
3916
3917                 foreach ( $lines as $line ) {
3918                         # match lines like these:
3919                         # Image:someimage.jpg|This is some image
3920                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3921                         # Skip empty lines
3922                         if ( count( $matches ) == 0 ) {
3923                                 continue;
3924                         }
3925                         $nt =& Title::newFromText( $matches[1] );
3926                         if( is_null( $nt ) ) {
3927                                 # Bogus title. Ignore these so we don't bomb out later.
3928                                 continue;
3929                         }
3930                         if ( isset( $matches[3] ) ) {
3931                                 $label = $matches[3];
3932                         } else {
3933                                 $label = '';
3934                         }
3935
3936                         $pout = $localParser->parse( $label , $this->mTitle, $parserOptions );
3937                         $html = $pout->getText();
3938
3939                         $ig->add( new Image( $nt ), $html );
3940
3941                         # Only add real images (bug #5586)
3942                         if ( $nt->getNamespace() == NS_IMAGE ) {
3943                                 $this->mOutput->addImage( $nt->getDBkey() );
3944                         }
3945
3946                         # Register links with the parent parser
3947                         foreach( $pout->getLinks() as $ns => $keys ) {
3948                                 foreach( $keys as $dbk => $id )
3949                                         $this->mOutput->addLink( Title::makeTitle( $ns, $dbk ), $id );
3950                         }
3951
3952                 }
3953                 return $ig->toHTML();
3954         }
3955
3956         /**
3957          * Parse image options text and use it to make an image
3958          */
3959         function makeImage( &$nt, $options ) {
3960                 global $wgUseImageResize;
3961
3962                 $align = '';
3963
3964                 # Check if the options text is of the form "options|alt text"
3965                 # Options are:
3966                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3967                 #  * left               no resizing, just left align. label is used for alt= only
3968                 #  * right              same, but right aligned
3969                 #  * none               same, but not aligned
3970                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3971                 #  * center             center the image
3972                 #  * framed             Keep original image size, no magnify-button.
3973
3974                 $part = explode( '|', $options);
3975
3976                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3977                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3978                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3979                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3980                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3981                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3982                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3983                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3984                 $caption = '';
3985
3986                 $width = $height = $framed = $thumb = false;
3987                 $manual_thumb = '' ;
3988
3989                 foreach( $part as $key => $val ) {
3990                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3991                                 $thumb=true;
3992                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3993                                 # use manually specified thumbnail
3994                                 $thumb=true;
3995                                 $manual_thumb = $match;
3996                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3997                                 # remember to set an alignment, don't render immediately
3998                                 $align = 'right';
3999                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
4000                                 # remember to set an alignment, don't render immediately
4001                                 $align = 'left';
4002                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
4003                                 # remember to set an alignment, don't render immediately
4004                                 $align = 'center';
4005                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
4006                                 # remember to set an alignment, don't render immediately
4007                                 $align = 'none';
4008                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4009                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
4010                                 # $match is the image width in pixels
4011                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4012                                         $width = intval( $m[1] );
4013                                         $height = intval( $m[2] );
4014                                 } else {
4015                                         $width = intval($match);
4016                                 }
4017                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4018                                 $framed=true;
4019                         } else {
4020                                 $caption = $val;
4021                         }
4022                 }
4023                 # Strip bad stuff out of the alt text
4024                 $alt = $this->replaceLinkHoldersText( $caption );
4025
4026                 # make sure there are no placeholders in thumbnail attributes
4027                 # that are later expanded to html- so expand them now and
4028                 # remove the tags
4029                 $alt = $this->unstrip($alt, $this->mStripState);
4030                 $alt = Sanitizer::stripAllTags( $alt );
4031
4032                 # Linker does the rest
4033                 $sk =& $this->mOptions->getSkin();
4034                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
4035         }
4036
4037         /**
4038          * Set a flag in the output object indicating that the content is dynamic and
4039          * shouldn't be cached.
4040          */
4041         function disableCache() {
4042                 wfDebug( "Parser output marked as uncacheable.\n" );
4043                 $this->mOutput->mCacheTime = -1;
4044         }
4045
4046         /**#@+
4047          * Callback from the Sanitizer for expanding items found in HTML attribute
4048          * values, so they can be safely tested and escaped.
4049          * @param string $text
4050          * @param array $args
4051          * @return string
4052          * @private
4053          */
4054         function attributeStripCallback( &$text, $args ) {
4055                 $text = $this->replaceVariables( $text, $args );
4056                 $text = $this->unstripForHTML( $text );
4057                 return $text;
4058         }
4059
4060         function unstripForHTML( $text ) {
4061                 $text = $this->unstrip( $text, $this->mStripState );
4062                 $text = $this->unstripNoWiki( $text, $this->mStripState );
4063                 return $text;
4064         }
4065         /**#@-*/
4066
4067         /**#@+
4068          * Accessor/mutator
4069          */
4070         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4071         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4072         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4073         /**#@-*/
4074
4075         /**#@+
4076          * Accessor
4077          */
4078         function getTags() { return array_keys( $this->mTagHooks ); }
4079         /**#@-*/
4080 }
4081
4082 /**
4083  * @todo document
4084  * @package MediaWiki
4085  */
4086 class ParserOutput
4087 {
4088         var $mText,             # The output text
4089                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4090                 $mCategories,       # Map of category names to sort keys
4091                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4092                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4093                 $mVersion,          # Compatibility check
4094                 $mTitleText,        # title text of the chosen language variant
4095                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4096                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4097                 $mImages,           # DB keys of the images used, in the array key only
4098                 $mExternalLinks,    # External link URLs, in the key only
4099                 $mHTMLtitle,            # Display HTML title
4100                 $mSubtitle,                     # Additional subtitle
4101                 $mNewSection;           # Show a new section link?
4102
4103         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4104                 $containsOldMagic = false, $titletext = '' )
4105         {
4106                 $this->mText = $text;
4107                 $this->mLanguageLinks = $languageLinks;
4108                 $this->mCategories = $categoryLinks;
4109                 $this->mContainsOldMagic = $containsOldMagic;
4110                 $this->mCacheTime = '';
4111                 $this->mVersion = MW_PARSER_VERSION;
4112                 $this->mTitleText = $titletext;
4113                 $this->mLinks = array();
4114                 $this->mTemplates = array();
4115                 $this->mImages = array();
4116                 $this->mExternalLinks = array();
4117                 $this->mHTMLtitle = "" ;
4118                 $this->mSubtitle = "" ;
4119                 $this->mNewSection = false;
4120         }
4121
4122         function getText()                   { return $this->mText; }
4123         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4124         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4125         function &getCategories()            { return $this->mCategories; }
4126         function getCacheTime()              { return $this->mCacheTime; }
4127         function getTitleText()              { return $this->mTitleText; }
4128         function &getLinks()                 { return $this->mLinks; }
4129         function &getTemplates()             { return $this->mTemplates; }
4130         function &getImages()                { return $this->mImages; }
4131         function &getExternalLinks()         { return $this->mExternalLinks; }
4132
4133         function containsOldMagic()          { return $this->mContainsOldMagic; }
4134         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4135         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4136         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4137         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4138         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4139         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
4140
4141         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4142         function addImage( $name )           { $this->mImages[$name] = 1; }
4143         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4144         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4145
4146         function setNewSection( $value ) {
4147                 $this->mNewSection = (bool)$value;
4148         }
4149         function getNewSection() {
4150                 return (bool)$this->mNewSection;
4151         }
4152
4153         function addLink( $title, $id ) {
4154                 $ns = $title->getNamespace();
4155                 $dbk = $title->getDBkey();
4156                 if ( !isset( $this->mLinks[$ns] ) ) {
4157                         $this->mLinks[$ns] = array();
4158                 }
4159                 $this->mLinks[$ns][$dbk] = $id;
4160         }
4161
4162         function addTemplate( $title, $id ) {
4163                 $ns = $title->getNamespace();
4164                 $dbk = $title->getDBkey();
4165                 if ( !isset( $this->mTemplates[$ns] ) ) {
4166                         $this->mTemplates[$ns] = array();
4167                 }
4168                 $this->mTemplates[$ns][$dbk] = $id;
4169         }
4170
4171         /**
4172          * Return true if this cached output object predates the global or
4173          * per-article cache invalidation timestamps, or if it comes from
4174          * an incompatible older version.
4175          *
4176          * @param string $touched the affected article's last touched timestamp
4177          * @return bool
4178          * @public
4179          */
4180         function expired( $touched ) {
4181                 global $wgCacheEpoch;
4182                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4183                        $this->getCacheTime() < $touched ||
4184                        $this->getCacheTime() <= $wgCacheEpoch ||
4185                        !isset( $this->mVersion ) ||
4186                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4187         }
4188 }
4189
4190 /**
4191  * Set options of the Parser
4192  * @todo document
4193  * @package MediaWiki
4194  */
4195 class ParserOptions
4196 {
4197         # All variables are private
4198         var $mUseTeX;                    # Use texvc to expand <math> tags
4199         var $mUseDynamicDates;           # Use DateFormatter to format dates
4200         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
4201         var $mAllowExternalImages;       # Allow external images inline
4202         var $mAllowExternalImagesFrom;   # If not, any exception?
4203         var $mSkin;                      # Reference to the preferred skin
4204         var $mDateFormat;                # Date format index
4205         var $mEditSection;               # Create "edit section" links
4206         var $mNumberHeadings;            # Automatically number headings
4207         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
4208         var $mTidy;                      # Ask for tidy cleanup
4209         var $mInterfaceMessage;          # Which lang to call for PLURAL and GRAMMAR
4210
4211         function getUseTeX()                        { return $this->mUseTeX; }
4212         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4213         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4214         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4215         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4216         function &getSkin()                         { return $this->mSkin; }
4217         function getDateFormat()                    { return $this->mDateFormat; }
4218         function getEditSection()                   { return $this->mEditSection; }
4219         function getNumberHeadings()                { return $this->mNumberHeadings; }
4220         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4221         function getTidy()                          { return $this->mTidy; }
4222         function getInterfaceMessage()              { return $this->mInterfaceMessage; }
4223
4224         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4225         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4226         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4227         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4228         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4229         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4230         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4231         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4232         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4233         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4234         function setSkin( &$x ) { $this->mSkin =& $x; }
4235         function setInterfaceMessage( $x )          { return wfSetVar( $this->mInterfaceMessage, $x); }
4236
4237         function ParserOptions() {
4238                 global $wgUser;
4239                 $this->initialiseFromUser( $wgUser );
4240         }
4241
4242         /**
4243          * Get parser options
4244          * @static
4245          */
4246         function newFromUser( &$user ) {
4247                 $popts = new ParserOptions;
4248                 $popts->initialiseFromUser( $user );
4249                 return $popts;
4250         }
4251
4252         /** Get user options */
4253         function initialiseFromUser( &$userInput ) {
4254                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4255                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4256                 $fname = 'ParserOptions::initialiseFromUser';
4257                 wfProfileIn( $fname );
4258                 if ( !$userInput ) {
4259                         $user = new User;
4260                         $user->setLoaded( true );
4261                 } else {
4262                         $user =& $userInput;
4263                 }
4264
4265                 $this->mUseTeX = $wgUseTeX;
4266                 $this->mUseDynamicDates = $wgUseDynamicDates;
4267                 $this->mInterwikiMagic = $wgInterwikiMagic;
4268                 $this->mAllowExternalImages = $wgAllowExternalImages;
4269                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4270                 wfProfileIn( $fname.'-skin' );
4271                 $this->mSkin =& $user->getSkin();
4272                 wfProfileOut( $fname.'-skin' );
4273                 $this->mDateFormat = $user->getOption( 'date' );
4274                 $this->mEditSection = true;
4275                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4276                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4277                 $this->mTidy = false;
4278                 $this->mInterfaceMessage = false;
4279                 wfProfileOut( $fname );
4280         }
4281 }
4282
4283 /**
4284  * Callback function used by Parser::replaceLinkHolders()
4285  * to substitute link placeholders.
4286  */
4287 function &wfOutputReplaceMatches( $matches ) {
4288         global $wgOutputReplace;
4289         return $wgOutputReplace[$matches[1]];
4290 }
4291
4292 /**
4293  * Return the total number of articles
4294  */
4295 function wfNumberOfArticles() {
4296         global $wgNumberOfArticles;
4297
4298         wfLoadSiteStats();
4299         return $wgNumberOfArticles;
4300 }
4301
4302 /**
4303  * Return the number of files
4304  */
4305 function wfNumberOfFiles() {
4306         $fname = 'wfNumberOfFiles';
4307
4308         wfProfileIn( $fname );
4309         $dbr =& wfGetDB( DB_SLAVE );
4310         $numImages = $dbr->selectField('site_stats', 'ss_images', array(), $fname );
4311         wfProfileOut( $fname );
4312
4313         return $numImages;
4314 }
4315
4316 /**
4317  * Return the number of user accounts
4318  * @return integer
4319  */
4320 function wfNumberOfUsers() {
4321         wfProfileIn( 'wfNumberOfUsers' );
4322         $dbr =& wfGetDB( DB_SLAVE );
4323         $count = $dbr->selectField( 'site_stats', 'ss_users', array(), 'wfNumberOfUsers' );
4324         wfProfileOut( 'wfNumberOfUsers' );
4325         return (int)$count;
4326 }
4327
4328 /**
4329  * Return the total number of pages
4330  * @return integer
4331  */
4332 function wfNumberOfPages() {
4333         wfProfileIn( 'wfNumberOfPages' );
4334         $dbr =& wfGetDB( DB_SLAVE );
4335         $count = $dbr->selectField( 'site_stats', 'ss_total_pages', array(), 'wfNumberOfPages' );
4336         wfProfileOut( 'wfNumberOfPages' );
4337         return (int)$count;
4338 }
4339
4340 /**
4341  * Get various statistics from the database
4342  * @private
4343  */
4344 function wfLoadSiteStats() {
4345         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4346         $fname = 'wfLoadSiteStats';
4347
4348         if ( -1 != $wgNumberOfArticles ) return;
4349         $dbr =& wfGetDB( DB_SLAVE );
4350         $s = $dbr->selectRow( 'site_stats',
4351                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4352                 array( 'ss_row_id' => 1 ), $fname
4353         );
4354
4355         if ( $s === false ) {
4356                 return;
4357         } else {
4358                 $wgTotalViews = $s->ss_total_views;
4359                 $wgTotalEdits = $s->ss_total_edits;
4360                 $wgNumberOfArticles = $s->ss_good_articles;
4361         }
4362 }
4363
4364 /**
4365  * Escape html tags
4366  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4367  *
4368  * @param $in String: text that might contain HTML tags.
4369  * @return string Escaped string
4370  */
4371 function wfEscapeHTMLTagsOnly( $in ) {
4372         return str_replace(
4373                 array( '"', '>', '<' ),
4374                 array( '&quot;', '&gt;', '&lt;' ),
4375                 $in );
4376 }
4377
4378 ?>