includes/Parser.php

   1 <?php
   2 /**
   3  * File for Parser and related classes
   4  *
   5  * @package MediaWiki
   6  * @subpackage Parser
   7  */
   8
   9 /** */
  10 require_once( 'Sanitizer.php' );
  11 require_once( 'HttpFunctions.php' );
  12
  13 /**
  14  * Update this version number when the ParserOutput format
  15  * changes in an incompatible way, so the parser cache
  16  * can automatically discard old data.
  17  */
  18 define( 'MW_PARSER_VERSION', '1.6.0' );
  19
  20 /**
  21  * Variable substitution O(N^2) attack
  22  *
  23  * Without countermeasures, it would be possible to attack the parser by saving
  24  * a page filled with a large number of inclusions of large pages. The size of
  25  * the generated page would be proportional to the square of the input size.
  26  * Hence, we limit the number of inclusions of any given page, thus bringing any
  27  * attack back to O(N).
  28  */
  29
  30 define( 'MAX_INCLUDE_REPEAT', 100 );
  31 define( 'MAX_INCLUDE_SIZE', 1000000 ); // 1 Million
  32
  33 define( 'RLH_FOR_UPDATE', 1 );
  34
  35 # Allowed values for $mOutputType
  36 define( 'OT_HTML', 1 );
  37 define( 'OT_WIKI', 2 );
  38 define( 'OT_MSG' , 3 );
  39
  40 # string parameter for extractTags which will cause it
  41 # to strip HTML comments in addition to regular
  42 # <XML>-style tags. This should not be anything we
  43 # may want to use in wikisyntax
  44 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  45
  46 # Constants needed for external link processing
  47 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  48 # Everything except bracket, space, or control characters
  49 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  50 # Including space
  51 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x00-\\x1F\\x7F]' );
  52 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  53 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  54 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  55 define( 'EXT_IMAGE_REGEX',
  56         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  57         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  58         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  59 );
  60
  61 /**
  62  * PHP Parser
  63  *
  64  * Processes wiki markup
  65  *
  66  * <pre>
  67  * There are three main entry points into the Parser class:
  68  * parse()
  69  *   produces HTML output
  70  * preSaveTransform().
  71  *   produces altered wiki markup.
  72  * transformMsg()
  73  *   performs brace substitution on MediaWiki messages
  74  *
  75  * Globals used:
  76  *    objects:   $wgLang, $wgContLang
  77  *
  78  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  79  *
  80  * settings:
  81  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  82  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  83  *  $wgLocaltimezone, $wgAllowSpecialInclusion*
  84  *
  85  *  * only within ParserOptions
  86  * </pre>
  87  *
  88  * @package MediaWiki
  89  */
  90 class Parser
  91 {
  92         /**#@+
  93          * @access private
  94          */
  95         # Persistent:
  96         var $mTagHooks, $mFunctionHooks;
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 100         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 102         var $mTemplates,        // cache of already loaded templates, avoids
 103                                 // multiple SQL queries for the same string
 104             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 105                                 // in this path. Used for loop detection.
 106
 107         # Temporary
 108         # These are variables reset at least once per parse regardless of $clearState
 109         var $mOptions,      // ParserOptions object
 110                 $mTitle,        // Title context, used for self-link rendering and similar things
 111                 $mOutputType,   // Output type, one of the OT_xxx constants
 112                 $mRevisionId;   // ID to display in {{REVISIONID}} tags
 113
 114         /**#@-*/
 115
 116         /**
 117          * Constructor
 118          *
 119          * @access public
 120          */
 121         function Parser() {
 122                 $this->mTagHooks = array();
 123                 $this->mFunctionHooks = array();
 124                 $this->clearState();
 125         }
 126
 127         /**
 128          * Clear Parser state
 129          *
 130          * @access private
 131          */
 132         function clearState() {
 133                 $this->mOutput = new ParserOutput;
 134                 $this->mAutonumber = 0;
 135                 $this->mLastSection = '';
 136                 $this->mDTopen = false;
 137                 $this->mVariables = false;
 138                 $this->mIncludeCount = array();
 139                 $this->mStripState = array();
 140                 $this->mArgStack = array();
 141                 $this->mInPre = false;
 142                 $this->mInterwikiLinkHolders = array(
 143                         'texts' => array(),
 144                         'titles' => array()
 145                 );
 146                 $this->mLinkHolders = array(
 147                         'namespaces' => array(),
 148                         'dbkeys' => array(),
 149                         'queries' => array(),
 150                         'texts' => array(),
 151                         'titles' => array()
 152                 );
 153                 $this->mRevisionId = null;
 154                 $this->mUniqPrefix = 'UNIQ' . Parser::getRandomString();
 155
 156                 # Clear these on every parse, bug 4549
 157                 $this->mTemplates = array();
 158                 $this->mTemplatePath = array();
 159
 160                 wfRunHooks( 'ParserClearState', array( &$this ) );
 161         }
 162
 163         /**
 164          * Accessor for mUniqPrefix.
 165          *
 166          * @access public
 167          */
 168         function UniqPrefix() {
 169                 return $this->mUniqPrefix;
 170         }
 171
 172         /**
 173          * Convert wikitext to HTML
 174          * Do not call this function recursively.
 175          *
 176          * @access private
 177          * @param string $text Text we want to parse
 178          * @param Title &$title A title object
 179          * @param array $options
 180          * @param boolean $linestart
 181          * @param boolean $clearState
 182          * @param int $revid number to pass in {{REVISIONID}}
 183          * @return ParserOutput a ParserOutput
 184          */
 185         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 186                 /**
 187                  * First pass--just handle <nowiki> sections, pass the rest off
 188                  * to internalParse() which does all the real work.
 189                  */
 190
 191                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 192                 $fname = 'Parser::parse';
 193                 wfProfileIn( $fname );
 194
 195                 if ( $clearState ) {
 196                         $this->clearState();
 197                 }
 198
 199                 $this->mOptions = $options;
 200                 $this->mTitle =& $title;
 201                 $this->mRevisionId = $revid;
 202                 $this->mOutputType = OT_HTML;
 203
 204                 //$text = $this->strip( $text, $this->mStripState );
 205                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 206                 $x =& $this->mStripState;
 207
 208                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$x ) );
 209                 $text = $this->strip( $text, $x );
 210                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$x ) );
 211
 212                 # Hook to suspend the parser in this state
 213                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$x ) ) ) {
 214                         wfProfileOut( $fname );
 215                         return $text ;
 216                 }
 217
 218                 $text = $this->internalParse( $text );
 219
 220                 $text = $this->unstrip( $text, $this->mStripState );
 221
 222                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 223                 $fixtags = array(
 224                         # french spaces, last one Guillemet-left
 225                         # only if there is something before the space
 226                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 227                         # french spaces, Guillemet-right
 228                         '/(\\302\\253) /' => '\\1&nbsp;',
 229                         '/<center *>(.*)<\\/center *>/i' => '<div class="center">\\1</div>',
 230                 );
 231                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 232
 233                 # only once and last
 234                 $text = $this->doBlockLevels( $text, $linestart );
 235
 236                 $this->replaceLinkHolders( $text );
 237
 238                 # the position of the parserConvert() call should not be changed. it
 239                 # assumes that the links are all replaced and the only thing left
 240                 # is the <nowiki> mark.
 241                 # Side-effects: this calls $this->mOutput->setTitleText()
 242                 $text = $wgContLang->parserConvert( $text, $this );
 243
 244                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 245
 246                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 247
 248                 $text = Sanitizer::normalizeCharReferences( $text );
 249
 250                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 251                         $text = Parser::tidy($text);
 252                 } else {
 253                         # attempt to sanitize at least some nesting problems
 254                         # (bug #2702 and quite a few others)
 255                         $tidyregs = array(
 256                                 # ''Something [http://www.cool.com cool''] -->
 257                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 258                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 259                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 260                                 # fix up an anchor inside another anchor, only
 261                                 # at least for a single single nested link (bug 3695)
 262                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 263                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 264                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 265                                 # contains a div, so fix it up here; replace
 266                                 # div with escaped text
 267                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 268                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 269                                 # remove empty italic or bold tag pairs, some
 270                                 # introduced by rules above
 271                                 '/<([bi])><\/\\1>/' => ''
 272                         );
 273
 274                         $text = preg_replace(
 275                                 array_keys( $tidyregs ),
 276                                 array_values( $tidyregs ),
 277                                 $text );
 278                 }
 279
 280                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 281
 282                 $this->mOutput->setText( $text );
 283                 wfProfileOut( $fname );
 284
 285                 return $this->mOutput;
 286         }
 287
 288         /**
 289          * Get a random string
 290          *
 291          * @access private
 292          * @static
 293          */
 294         function getRandomString() {
 295                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 296         }
 297
 298         function &getTitle() { return $this->mTitle; }
 299         function getOptions() { return $this->mOptions; }
 300
 301         /**
 302          * Replaces all occurrences of <$tag>content</$tag> in the text
 303          * with a random marker and returns the new text. the output parameter
 304          * $content will be an associative array filled with data on the form
 305          * $unique_marker => content.
 306          *
 307          * If $content is already set, the additional entries will be appended
 308          * If $tag is set to STRIP_COMMENTS, the function will extract
 309          * <!-- HTML comments -->
 310          *
 311          * @access private
 312          * @static
 313          */
 314         function extractTagsAndParams($tag, $text, &$content, &$tags, &$params, $uniq_prefix = ''){
 315                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 316                 if ( !$content ) {
 317                         $content = array( );
 318                 }
 319                 $n = 1;
 320                 $stripped = '';
 321
 322                 if ( !$tags ) {
 323                         $tags = array( );
 324                 }
 325
 326                 if ( !$params ) {
 327                         $params = array( );
 328                 }
 329
 330                 if( $tag == STRIP_COMMENTS ) {
 331                         $start = '/<!--()/';
 332                         $end   = '/-->/';
 333                 } else {
 334                         $start = "/<$tag(\\s+[^>]*|\\s*\/?)>/i";
 335                         $end   = "/<\\/$tag\\s*>/i";
 336                 }
 337
 338                 while ( '' != $text ) {
 339                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 340                         $stripped .= $p[0];
 341                         if( count( $p ) < 3 ) {
 342                                 break;
 343                         }
 344                         $attributes = $p[1];
 345                         $inside     = $p[2];
 346
 347                         // If $attributes ends with '/', we have an empty element tag, <tag />
 348                         if( $tag != STRIP_COMMENTS && substr( $attributes, -1 ) == '/' ) {
 349                                 $attributes = substr( $attributes, 0, -1);
 350                                 $empty = '/';
 351                         } else {
 352                                 $empty = '';
 353                         }
 354
 355                         $marker = $rnd . sprintf('%08X', $n++);
 356                         $stripped .= $marker;
 357
 358                         $tags[$marker] = "<$tag$attributes$empty>";
 359                         $params[$marker] = Sanitizer::decodeTagAttributes( $attributes );
 360
 361                         if ( $empty === '/' ) {
 362                                 // Empty element tag, <tag />
 363                                 $content[$marker] = null;
 364                                 $text = $inside;
 365                         } else {
 366                                 $q = preg_split( $end, $inside, 2 );
 367                                 $content[$marker] = $q[0];
 368                                 if( count( $q ) < 2 ) {
 369                                         # No end tag -- let it run out to the end of the text.
 370                                         break;
 371                                 } else {
 372                                         $text = $q[1];
 373                                 }
 374                         }
 375                 }
 376                 return $stripped;
 377         }
 378
 379         /**
 380          * Wrapper function for extractTagsAndParams
 381          * for cases where $tags and $params isn't needed
 382          * i.e. where tags will never have params, like <nowiki>
 383          *
 384          * @access private
 385          * @static
 386          */
 387         function extractTags( $tag, $text, &$content, $uniq_prefix = '' ) {
 388                 $dummy_tags = array();
 389                 $dummy_params = array();
 390
 391                 return Parser::extractTagsAndParams( $tag, $text, $content,
 392                         $dummy_tags, $dummy_params, $uniq_prefix );
 393         }
 394
 395         /**
 396          * Strips and renders nowiki, pre, math, hiero
 397          * If $render is set, performs necessary rendering operations on plugins
 398          * Returns the text, and fills an array with data needed in unstrip()
 399          * If the $state is already a valid strip state, it adds to the state
 400          *
 401          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 402          *  will be stripped in addition to other tags. This is important
 403          *  for section editing, where these comments cause confusion when
 404          *  counting the sections in the wikisource
 405          *
 406          * @access private
 407          */
 408         function strip( $text, &$state, $stripcomments = false ) {
 409                 $render = ($this->mOutputType == OT_HTML);
 410                 $html_content = array();
 411                 $nowiki_content = array();
 412                 $math_content = array();
 413                 $pre_content = array();
 414                 $comment_content = array();
 415                 $ext_content = array();
 416                 $ext_tags = array();
 417                 $ext_params = array();
 418                 $gallery_content = array();
 419
 420                 # Replace any instances of the placeholders
 421                 $uniq_prefix = $this->mUniqPrefix;
 422                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 423
 424                 # html
 425                 global $wgRawHtml;
 426                 if( $wgRawHtml ) {
 427                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 428                         foreach( $html_content as $marker => $content ) {
 429                                 if ($render ) {
 430                                         # Raw and unchecked for validity.
 431                                         $html_content[$marker] = $content;
 432                                 } else {
 433                                         $html_content[$marker] = '<html>'.$content.'</html>';
 434                                 }
 435                         }
 436                 }
 437
 438                 # nowiki
 439                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 440                 foreach( $nowiki_content as $marker => $content ) {
 441                         if( $render ){
 442                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 443                         } else {
 444                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 445                         }
 446                 }
 447
 448                 # math
 449                 if( $this->mOptions->getUseTeX() ) {
 450                         $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 451                         foreach( $math_content as $marker => $content ){
 452                                 if( $render ) {
 453                                         $math_content[$marker] = renderMath( $content );
 454                                 } else {
 455                                         $math_content[$marker] = '<math>'.$content.'</math>';
 456                                 }
 457                         }
 458                 }
 459
 460                 # pre
 461                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 462                 foreach( $pre_content as $marker => $content ){
 463                         if( $render ){
 464                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 465                         } else {
 466                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 467                         }
 468                 }
 469
 470                 # gallery
 471                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 472                 foreach( $gallery_content as $marker => $content ) {
 473                         require_once( 'ImageGallery.php' );
 474                         if ( $render ) {
 475                                 $gallery_content[$marker] = $this->renderImageGallery( $content );
 476                         } else {
 477                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 478                         }
 479                 }
 480
 481                 # Comments
 482                 $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 483                 foreach( $comment_content as $marker => $content ){
 484                         $comment_content[$marker] = '<!--'.$content.'-->';
 485                 }
 486
 487                 # Extensions
 488                 foreach ( $this->mTagHooks as $tag => $callback ) {
 489                         $ext_content[$tag] = array();
 490                         $text = Parser::extractTagsAndParams( $tag, $text, $ext_content[$tag],
 491                                 $ext_tags[$tag], $ext_params[$tag], $uniq_prefix );
 492                         foreach( $ext_content[$tag] as $marker => $content ) {
 493                                 $full_tag = $ext_tags[$tag][$marker];
 494                                 $params = $ext_params[$tag][$marker];
 495                                 if ( $render )
 496                                         $ext_content[$tag][$marker] = call_user_func_array( $callback, array( $content, $params, &$this ) );
 497                                 else {
 498                                         if ( is_null( $content ) ) {
 499                                                 // Empty element tag
 500                                                 $ext_content[$tag][$marker] = $full_tag;
 501                                         } else {
 502                                                 $ext_content[$tag][$marker] = "$full_tag$content</$tag>";
 503                                         }
 504                                 }
 505                         }
 506                 }
 507
 508                 # Unstrip comments unless explicitly told otherwise.
 509                 # (The comments are always stripped prior to this point, so as to
 510                 # not invoke any extension tags / parser hooks contained within
 511                 # a comment.)
 512                 if ( !$stripcomments ) {
 513                         $tempstate = array( 'comment' => $comment_content );
 514                         $text = $this->unstrip( $text, $tempstate );
 515                         $comment_content = array();
 516                 }
 517
 518                 # Merge state with the pre-existing state, if there is one
 519                 if ( $state ) {
 520                         $state['html'] = $state['html'] + $html_content;
 521                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 522                         $state['math'] = $state['math'] + $math_content;
 523                         $state['pre'] = $state['pre'] + $pre_content;
 524                         $state['gallery'] = $state['gallery'] + $gallery_content;
 525                         $state['comment'] = $state['comment'] + $comment_content;
 526
 527                         foreach( $ext_content as $tag => $array ) {
 528                                 if ( array_key_exists( $tag, $state ) ) {
 529                                         $state[$tag] = $state[$tag] + $array;
 530                                 }
 531                         }
 532                 } else {
 533                         $state = array(
 534                           'html' => $html_content,
 535                           'nowiki' => $nowiki_content,
 536                           'math' => $math_content,
 537                           'pre' => $pre_content,
 538                           'gallery' => $gallery_content,
 539                           'comment' => $comment_content,
 540                         ) + $ext_content;
 541                 }
 542                 return $text;
 543         }
 544
 545         /**
 546          * restores pre, math, and hiero removed by strip()
 547          *
 548          * always call unstripNoWiki() after this one
 549          * @access private
 550          */
 551         function unstrip( $text, &$state ) {
 552                 if ( !is_array( $state ) ) {
 553                         return $text;
 554                 }
 555
 556                 # Must expand in reverse order, otherwise nested tags will be corrupted
 557                 foreach( array_reverse( $state, true ) as $tag => $contentDict ) {
 558                         if( $tag != 'nowiki' && $tag != 'html' ) {
 559                                 foreach( array_reverse( $contentDict, true ) as $uniq => $content ) {
 560                                         $text = str_replace( $uniq, $content, $text );
 561                                 }
 562                         }
 563                 }
 564
 565                 return $text;
 566         }
 567
 568         /**
 569          * always call this after unstrip() to preserve the order
 570          *
 571          * @access private
 572          */
 573         function unstripNoWiki( $text, &$state ) {
 574                 if ( !is_array( $state ) ) {
 575                         return $text;
 576                 }
 577
 578                 # Must expand in reverse order, otherwise nested tags will be corrupted
 579                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 580                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 581                 }
 582
 583                 global $wgRawHtml;
 584                 if ($wgRawHtml) {
 585                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 586                                 $text = str_replace( key( $state['html'] ), $content, $text );
 587                         }
 588                 }
 589
 590                 return $text;
 591         }
 592
 593         /**
 594          * Add an item to the strip state
 595          * Returns the unique tag which must be inserted into the stripped text
 596          * The tag will be replaced with the original text in unstrip()
 597          *
 598          * @access private
 599          */
 600         function insertStripItem( $text, &$state ) {
 601                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 602                 if ( !$state ) {
 603                         $state = array(
 604                           'html' => array(),
 605                           'nowiki' => array(),
 606                           'math' => array(),
 607                           'pre' => array(),
 608                           'comment' => array(),
 609                           'gallery' => array(),
 610                         );
 611                 }
 612                 $state['item'][$rnd] = $text;
 613                 return $rnd;
 614         }
 615
 616         /**
 617          * Interface with html tidy, used if $wgUseTidy = true.
 618          * If tidy isn't able to correct the markup, the original will be
 619          * returned in all its glory with a warning comment appended.
 620          *
 621          * Either the external tidy program or the in-process tidy extension
 622          * will be used depending on availability. Override the default
 623          * $wgTidyInternal setting to disable the internal if it's not working.
 624          *
 625          * @param string $text Hideous HTML input
 626          * @return string Corrected HTML output
 627          * @access public
 628          * @static
 629          */
 630         function tidy( $text ) {
 631                 global $wgTidyInternal;
 632                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 633 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 634 '<head><title>test</title></head><body>'.$text.'</body></html>';
 635                 if( $wgTidyInternal ) {
 636                         $correctedtext = Parser::internalTidy( $wrappedtext );
 637                 } else {
 638                         $correctedtext = Parser::externalTidy( $wrappedtext );
 639                 }
 640                 if( is_null( $correctedtext ) ) {
 641                         wfDebug( "Tidy error detected!\n" );
 642                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 643                 }
 644                 return $correctedtext;
 645         }
 646
 647         /**
 648          * Spawn an external HTML tidy process and get corrected markup back from it.
 649          *
 650          * @access private
 651          * @static
 652          */
 653         function externalTidy( $text ) {
 654                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 655                 $fname = 'Parser::externalTidy';
 656                 wfProfileIn( $fname );
 657
 658                 $cleansource = '';
 659                 $opts = ' -utf8';
 660
 661                 $descriptorspec = array(
 662                         0 => array('pipe', 'r'),
 663                         1 => array('pipe', 'w'),
 664                         2 => array('file', '/dev/null', 'a')
 665                 );
 666                 $pipes = array();
 667                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 668                 if (is_resource($process)) {
 669                         // Theoretically, this style of communication could cause a deadlock
 670                         // here. If the stdout buffer fills up, then writes to stdin could
 671                         // block. This doesn't appear to happen with tidy, because tidy only
 672                         // writes to stdout after it's finished reading from stdin. Search
 673                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 674                         fwrite($pipes[0], $text);
 675                         fclose($pipes[0]);
 676                         while (!feof($pipes[1])) {
 677                                 $cleansource .= fgets($pipes[1], 1024);
 678                         }
 679                         fclose($pipes[1]);
 680                         proc_close($process);
 681                 }
 682
 683                 wfProfileOut( $fname );
 684
 685                 if( $cleansource == '' && $text != '') {
 686                         // Some kind of error happened, so we couldn't get the corrected text.
 687                         // Just give up; we'll use the source text and append a warning.
 688                         return null;
 689                 } else {
 690                         return $cleansource;
 691                 }
 692         }
 693
 694         /**
 695          * Use the HTML tidy PECL extension to use the tidy library in-process,
 696          * saving the overhead of spawning a new process. Currently written to
 697          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 698          *
 699          * 'pear install tidy' should be able to compile the extension module.
 700          *
 701          * @access private
 702          * @static
 703          */
 704         function internalTidy( $text ) {
 705                 global $wgTidyConf;
 706                 $fname = 'Parser::internalTidy';
 707                 wfProfileIn( $fname );
 708
 709                 tidy_load_config( $wgTidyConf );
 710                 tidy_set_encoding( 'utf8' );
 711                 tidy_parse_string( $text );
 712                 tidy_clean_repair();
 713                 if( tidy_get_status() == 2 ) {
 714                         // 2 is magic number for fatal error
 715                         // http://www.php.net/manual/en/function.tidy-get-status.php
 716                         $cleansource = null;
 717                 } else {
 718                         $cleansource = tidy_get_output();
 719                 }
 720                 wfProfileOut( $fname );
 721                 return $cleansource;
 722         }
 723
 724         /**
 725          * parse the wiki syntax used to render tables
 726          *
 727          * @access private
 728          */
 729         function doTableStuff ( $t ) {
 730                 $fname = 'Parser::doTableStuff';
 731                 wfProfileIn( $fname );
 732
 733                 $t = explode ( "\n" , $t ) ;
 734                 $td = array () ; # Is currently a td tag open?
 735                 $ltd = array () ; # Was it TD or TH?
 736                 $tr = array () ; # Is currently a tr tag open?
 737                 $ltr = array () ; # tr attributes
 738                 $has_opened_tr = array(); # Did this table open a <tr> element?
 739                 $indent_level = 0; # indent level of the table
 740                 foreach ( $t AS $k => $x )
 741                 {
 742                         $x = trim ( $x ) ;
 743                         $fc = substr ( $x , 0 , 1 ) ;
 744                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 745                                 $indent_level = strlen( $matches[1] );
 746
 747                                 $attributes = $this->unstripForHTML( $matches[2] );
 748
 749                                 $t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
 750                                         '<table' . Sanitizer::fixTagAttributes ( $attributes, 'table' ) . '>' ;
 751                                 array_push ( $td , false ) ;
 752                                 array_push ( $ltd , '' ) ;
 753                                 array_push ( $tr , false ) ;
 754                                 array_push ( $ltr , '' ) ;
 755                                 array_push ( $has_opened_tr, false );
 756                         }
 757                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 758                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 759                                 $z = "</table>" . substr ( $x , 2);
 760                                 $l = array_pop ( $ltd ) ;
 761                                 if ( !array_pop ( $has_opened_tr ) ) $z = "<tr><td></td></tr>" . $z ;
 762                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 763                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 764                                 array_pop ( $ltr ) ;
 765                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 766                         }
 767                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 768                                 $x = substr ( $x , 1 ) ;
 769                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 770                                 $z = '' ;
 771                                 $l = array_pop ( $ltd ) ;
 772                                 array_pop ( $has_opened_tr );
 773                                 array_push ( $has_opened_tr , true ) ;
 774                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 775                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 776                                 array_pop ( $ltr ) ;
 777                                 $t[$k] = $z ;
 778                                 array_push ( $tr , false ) ;
 779                                 array_push ( $td , false ) ;
 780                                 array_push ( $ltd , '' ) ;
 781                                 $attributes = $this->unstripForHTML( $x );
 782                                 array_push ( $ltr , Sanitizer::fixTagAttributes ( $attributes, 'tr' ) ) ;
 783                         }
 784                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 785                                 # $x is a table row
 786                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 787                                         $fc = '+' ;
 788                                         $x = substr ( $x , 1 ) ;
 789                                 }
 790                                 $after = substr ( $x , 1 ) ;
 791                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 792
 793                                 // Split up multiple cells on the same line.
 794                                 // FIXME: This can result in improper nesting of tags processed
 795                                 // by earlier parser steps, but should avoid splitting up eg
 796                                 // attribute values containing literal "||".
 797                                 $after = wfExplodeMarkup( '||', $after );
 798
 799                                 $t[$k] = '' ;
 800
 801                                 # Loop through each table cell
 802                                 foreach ( $after AS $theline )
 803                                 {
 804                                         $z = '' ;
 805                                         if ( $fc != '+' )
 806                                         {
 807                                                 $tra = array_pop ( $ltr ) ;
 808                                                 if ( !array_pop ( $tr ) ) $z = '<tr'.$tra.">\n" ;
 809                                                 array_push ( $tr , true ) ;
 810                                                 array_push ( $ltr , '' ) ;
 811                                                 array_pop ( $has_opened_tr );
 812                                                 array_push ( $has_opened_tr , true ) ;
 813                                         }
 814
 815                                         $l = array_pop ( $ltd ) ;
 816                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 817                                         if ( $fc == '|' ) $l = 'td' ;
 818                                         else if ( $fc == '!' ) $l = 'th' ;
 819                                         else if ( $fc == '+' ) $l = 'caption' ;
 820                                         else $l = '' ;
 821                                         array_push ( $ltd , $l ) ;
 822
 823                                         # Cell parameters
 824                                         $y = explode ( '|' , $theline , 2 ) ;
 825                                         # Note that a '|' inside an invalid link should not
 826                                         # be mistaken as delimiting cell parameters
 827                                         if ( strpos( $y[0], '[[' ) !== false ) {
 828                                                 $y = array ($theline);
 829                                         }
 830                                         if ( count ( $y ) == 1 )
 831                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 832                                         else {
 833                                                 $attributes = $this->unstripForHTML( $y[0] );
 834                                                 $y = "{$z}<{$l}".Sanitizer::fixTagAttributes($attributes, $l).">{$y[1]}" ;
 835                                         }
 836                                         $t[$k] .= $y ;
 837                                         array_push ( $td , true ) ;
 838                                 }
 839                         }
 840                 }
 841
 842                 # Closing open td, tr && table
 843                 while ( count ( $td ) > 0 )
 844                 {
 845                         $l = array_pop ( $ltd ) ;
 846                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 847                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 848                         if ( !array_pop ( $has_opened_tr ) ) $t[] = "<tr><td></td></tr>" ;
 849                         $t[] = '</table>' ;
 850                 }
 851
 852                 $t = implode ( "\n" , $t ) ;
 853                 # special case: don't return empty table
 854                 if($t == "<table>\n<tr><td></td></tr>\n</table>")
 855                         $t = '';
 856                 wfProfileOut( $fname );
 857                 return $t ;
 858         }
 859
 860         /**
 861          * Helper function for parse() that transforms wiki markup into
 862          * HTML. Only called for $mOutputType == OT_HTML.
 863          *
 864          * @access private
 865          */
 866         function internalParse( $text ) {
 867                 $args = array();
 868                 $isMain = true;
 869                 $fname = 'Parser::internalParse';
 870                 wfProfileIn( $fname );
 871
 872                 # Remove <noinclude> tags and <includeonly> sections
 873                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 874                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 875                 $text = preg_replace( '/<includeonly>.*?<\/includeonly>/s', '', $text );
 876
 877                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 878                 $text = $this->replaceVariables( $text, $args );
 879
 880                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 881
 882                 $text = $this->doHeadings( $text );
 883                 if($this->mOptions->getUseDynamicDates()) {
 884                         $df =& DateFormatter::getInstance();
 885                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 886                 }
 887                 $text = $this->doAllQuotes( $text );
 888                 $text = $this->replaceInternalLinks( $text );
 889                 $text = $this->replaceExternalLinks( $text );
 890
 891                 # replaceInternalLinks may sometimes leave behind
 892                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 893                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 894
 895                 $text = $this->doMagicLinks( $text );
 896                 $text = $this->doTableStuff( $text );
 897                 $text = $this->formatHeadings( $text, $isMain );
 898
 899                 wfProfileOut( $fname );
 900                 return $text;
 901         }
 902
 903         /**
 904          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 905          * magic external links.
 906          *
 907          * @access private
 908          */
 909         function &doMagicLinks( &$text ) {
 910                 $text = $this->magicISBN( $text );
 911                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 912                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 913                 return $text;
 914         }
 915
 916         /**
 917          * Parse headers and return html
 918          *
 919          * @access private
 920          */
 921         function doHeadings( $text ) {
 922                 $fname = 'Parser::doHeadings';
 923                 wfProfileIn( $fname );
 924                 for ( $i = 6; $i >= 1; --$i ) {
 925                         $h = str_repeat( '=', $i );
 926                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 927                           "<h{$i}>\\1</h{$i}>\\2", $text );
 928                 }
 929                 wfProfileOut( $fname );
 930                 return $text;
 931         }
 932
 933         /**
 934          * Replace single quotes with HTML markup
 935          * @access private
 936          * @return string the altered text
 937          */
 938         function doAllQuotes( $text ) {
 939                 $fname = 'Parser::doAllQuotes';
 940                 wfProfileIn( $fname );
 941                 $outtext = '';
 942                 $lines = explode( "\n", $text );
 943                 foreach ( $lines as $line ) {
 944                         $outtext .= $this->doQuotes ( $line ) . "\n";
 945                 }
 946                 $outtext = substr($outtext, 0,-1);
 947                 wfProfileOut( $fname );
 948                 return $outtext;
 949         }
 950
 951         /**
 952          * Helper function for doAllQuotes()
 953          * @access private
 954          */
 955         function doQuotes( $text ) {
 956                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 957                 if ( count( $arr ) == 1 )
 958                         return $text;
 959                 else
 960                 {
 961                         # First, do some preliminary work. This may shift some apostrophes from
 962                         # being mark-up to being text. It also counts the number of occurrences
 963                         # of bold and italics mark-ups.
 964                         $i = 0;
 965                         $numbold = 0;
 966                         $numitalics = 0;
 967                         foreach ( $arr as $r )
 968                         {
 969                                 if ( ( $i % 2 ) == 1 )
 970                                 {
 971                                         # If there are ever four apostrophes, assume the first is supposed to
 972                                         # be text, and the remaining three constitute mark-up for bold text.
 973                                         if ( strlen( $arr[$i] ) == 4 )
 974                                         {
 975                                                 $arr[$i-1] .= "'";
 976                                                 $arr[$i] = "'''";
 977                                         }
 978                                         # If there are more than 5 apostrophes in a row, assume they're all
 979                                         # text except for the last 5.
 980                                         else if ( strlen( $arr[$i] ) > 5 )
 981                                         {
 982                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 983                                                 $arr[$i] = "'''''";
 984                                         }
 985                                         # Count the number of occurrences of bold and italics mark-ups.
 986                                         # We are not counting sequences of five apostrophes.
 987                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 988                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 989                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 990                                 }
 991                                 $i++;
 992                         }
 993
 994                         # If there is an odd number of both bold and italics, it is likely
 995                         # that one of the bold ones was meant to be an apostrophe followed
 996                         # by italics. Which one we cannot know for certain, but it is more
 997                         # likely to be one that has a single-letter word before it.
 998                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 999                         {
1000                                 $i = 0;
1001                                 $firstsingleletterword = -1;
1002                                 $firstmultiletterword = -1;
1003                                 $firstspace = -1;
1004                                 foreach ( $arr as $r )
1005                                 {
1006                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1007                                         {
1008                                                 $x1 = substr ($arr[$i-1], -1);
1009                                                 $x2 = substr ($arr[$i-1], -2, 1);
1010                                                 if ($x1 == ' ') {
1011                                                         if ($firstspace == -1) $firstspace = $i;
1012                                                 } else if ($x2 == ' ') {
1013                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1014                                                 } else {
1015                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1016                                                 }
1017                                         }
1018                                         $i++;
1019                                 }
1020
1021                                 # If there is a single-letter word, use it!
1022                                 if ($firstsingleletterword > -1)
1023                                 {
1024                                         $arr [ $firstsingleletterword ] = "''";
1025                                         $arr [ $firstsingleletterword-1 ] .= "'";
1026                                 }
1027                                 # If not, but there's a multi-letter word, use that one.
1028                                 else if ($firstmultiletterword > -1)
1029                                 {
1030                                         $arr [ $firstmultiletterword ] = "''";
1031                                         $arr [ $firstmultiletterword-1 ] .= "'";
1032                                 }
1033                                 # ... otherwise use the first one that has neither.
1034                                 # (notice that it is possible for all three to be -1 if, for example,
1035                                 # there is only one pentuple-apostrophe in the line)
1036                                 else if ($firstspace > -1)
1037                                 {
1038                                         $arr [ $firstspace ] = "''";
1039                                         $arr [ $firstspace-1 ] .= "'";
1040                                 }
1041                         }
1042
1043                         # Now let's actually convert our apostrophic mush to HTML!
1044                         $output = '';
1045                         $buffer = '';
1046                         $state = '';
1047                         $i = 0;
1048                         foreach ($arr as $r)
1049                         {
1050                                 if (($i % 2) == 0)
1051                                 {
1052                                         if ($state == 'both')
1053                                                 $buffer .= $r;
1054                                         else
1055                                                 $output .= $r;
1056                                 }
1057                                 else
1058                                 {
1059                                         if (strlen ($r) == 2)
1060                                         {
1061                                                 if ($state == 'i')
1062                                                 { $output .= '</i>'; $state = ''; }
1063                                                 else if ($state == 'bi')
1064                                                 { $output .= '</i>'; $state = 'b'; }
1065                                                 else if ($state == 'ib')
1066                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1067                                                 else if ($state == 'both')
1068                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1069                                                 else # $state can be 'b' or ''
1070                                                 { $output .= '<i>'; $state .= 'i'; }
1071                                         }
1072                                         else if (strlen ($r) == 3)
1073                                         {
1074                                                 if ($state == 'b')
1075                                                 { $output .= '</b>'; $state = ''; }
1076                                                 else if ($state == 'bi')
1077                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1078                                                 else if ($state == 'ib')
1079                                                 { $output .= '</b>'; $state = 'i'; }
1080                                                 else if ($state == 'both')
1081                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1082                                                 else # $state can be 'i' or ''
1083                                                 { $output .= '<b>'; $state .= 'b'; }
1084                                         }
1085                                         else if (strlen ($r) == 5)
1086                                         {
1087                                                 if ($state == 'b')
1088                                                 { $output .= '</b><i>'; $state = 'i'; }
1089                                                 else if ($state == 'i')
1090                                                 { $output .= '</i><b>'; $state = 'b'; }
1091                                                 else if ($state == 'bi')
1092                                                 { $output .= '</i></b>'; $state = ''; }
1093                                                 else if ($state == 'ib')
1094                                                 { $output .= '</b></i>'; $state = ''; }
1095                                                 else if ($state == 'both')
1096                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1097                                                 else # ($state == '')
1098                                                 { $buffer = ''; $state = 'both'; }
1099                                         }
1100                                 }
1101                                 $i++;
1102                         }
1103                         # Now close all remaining tags.  Notice that the order is important.
1104                         if ($state == 'b' || $state == 'ib')
1105                                 $output .= '</b>';
1106                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1107                                 $output .= '</i>';
1108                         if ($state == 'bi')
1109                                 $output .= '</b>';
1110                         if ($state == 'both')
1111                                 $output .= '<b><i>'.$buffer.'</i></b>';
1112                         return $output;
1113                 }
1114         }
1115
1116         /**
1117          * Replace external links
1118          *
1119          * Note: this is all very hackish and the order of execution matters a lot.
1120          * Make sure to run maintenance/parserTests.php if you change this code.
1121          *
1122          * @access private
1123          */
1124         function replaceExternalLinks( $text ) {
1125                 global $wgContLang;
1126                 $fname = 'Parser::replaceExternalLinks';
1127                 wfProfileIn( $fname );
1128
1129                 $sk =& $this->mOptions->getSkin();
1130
1131                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1132
1133                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1134
1135                 $i = 0;
1136                 while ( $i<count( $bits ) ) {
1137                         $url = $bits[$i++];
1138                         $protocol = $bits[$i++];
1139                         $text = $bits[$i++];
1140                         $trail = $bits[$i++];
1141
1142                         # The characters '<' and '>' (which were escaped by
1143                         # removeHTMLtags()) should not be included in
1144                         # URLs, per RFC 2396.
1145                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1146                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1147                                 $url = substr($url, 0, $m2[0][1]);
1148                         }
1149
1150                         # If the link text is an image URL, replace it with an <img> tag
1151                         # This happened by accident in the original parser, but some people used it extensively
1152                         $img = $this->maybeMakeExternalImage( $text );
1153                         if ( $img !== false ) {
1154                                 $text = $img;
1155                         }
1156
1157                         $dtrail = '';
1158
1159                         # Set linktype for CSS - if URL==text, link is essentially free
1160                         $linktype = ($text == $url) ? 'free' : 'text';
1161
1162                         # No link text, e.g. [http://domain.tld/some.link]
1163                         if ( $text == '' ) {
1164                                 # Autonumber if allowed
1165                                 if ( strpos( HTTP_PROTOCOLS, str_replace('/','\/', $protocol) ) !== false ) {
1166                                         $text = '[' . ++$this->mAutonumber . ']';
1167                                         $linktype = 'autonumber';
1168                                 } else {
1169                                         # Otherwise just use the URL
1170                                         $text = htmlspecialchars( $url );
1171                                         $linktype = 'free';
1172                                 }
1173                         } else {
1174                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1175                                 # Check for trail
1176                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1177                         }
1178
1179                         $text = $wgContLang->markNoConversion($text);
1180
1181                         # Replace &amp; from obsolete syntax with &.
1182                         # All HTML entities will be escaped by makeExternalLink()
1183                         $url = str_replace( '&amp;', '&', $url );
1184
1185                         # Process the trail (i.e. everything after this link up until start of the next link),
1186                         # replacing any non-bracketed links
1187                         $trail = $this->replaceFreeExternalLinks( $trail );
1188
1189                         # Use the encoded URL
1190                         # This means that users can paste URLs directly into the text
1191                         # Funny characters like &ouml; aren't valid in URLs anyway
1192                         # This was changed in August 2004
1193                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1194
1195                         # Register link in the output object.
1196                         # Replace unnecessary URL escape codes with the referenced character
1197                         # This prevents spammers from hiding links from the filters
1198                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1199                         $this->mOutput->addExternalLink( $pasteurized );
1200                 }
1201
1202                 wfProfileOut( $fname );
1203                 return $s;
1204         }
1205
1206         /**
1207          * Replace anything that looks like a URL with a link
1208          * @access private
1209          */
1210         function replaceFreeExternalLinks( $text ) {
1211                 global $wgContLang;
1212                 $fname = 'Parser::replaceFreeExternalLinks';
1213                 wfProfileIn( $fname );
1214
1215                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1216                 $s = array_shift( $bits );
1217                 $i = 0;
1218
1219                 $sk =& $this->mOptions->getSkin();
1220
1221                 while ( $i < count( $bits ) ){
1222                         $protocol = $bits[$i++];
1223                         $remainder = $bits[$i++];
1224
1225                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1226                                 # Found some characters after the protocol that look promising
1227                                 $url = $protocol . $m[1];
1228                                 $trail = $m[2];
1229
1230                                 # special case: handle urls as url args:
1231                                 # http://www.example.com/foo?=http://www.example.com/bar
1232                                 if(strlen($trail) == 0 &&
1233                                         isset($bits[$i]) &&
1234                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1235                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1236                                 {
1237                                         # add protocol, arg
1238                                         $url .= $bits[$i] . $bits[$i + 1]; # protocol, url as arg to previous link
1239                                         $i += 2;
1240                                         $trail = $m[2];
1241                                 }
1242
1243                                 # The characters '<' and '>' (which were escaped by
1244                                 # removeHTMLtags()) should not be included in
1245                                 # URLs, per RFC 2396.
1246                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1247                                         $trail = substr($url, $m2[0][1]) . $trail;
1248                                         $url = substr($url, 0, $m2[0][1]);
1249                                 }
1250
1251                                 # Move trailing punctuation to $trail
1252                                 $sep = ',;\.:!?';
1253                                 # If there is no left bracket, then consider right brackets fair game too
1254                                 if ( strpos( $url, '(' ) === false ) {
1255                                         $sep .= ')';
1256                                 }
1257
1258                                 $numSepChars = strspn( strrev( $url ), $sep );
1259                                 if ( $numSepChars ) {
1260                                         $trail = substr( $url, -$numSepChars ) . $trail;
1261                                         $url = substr( $url, 0, -$numSepChars );
1262                                 }
1263
1264                                 # Replace &amp; from obsolete syntax with &.
1265                                 # All HTML entities will be escaped by makeExternalLink()
1266                                 # or maybeMakeExternalImage()
1267                                 $url = str_replace( '&amp;', '&', $url );
1268
1269                                 # Is this an external image?
1270                                 $text = $this->maybeMakeExternalImage( $url );
1271                                 if ( $text === false ) {
1272                                         # Not an image, make a link
1273                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free' );
1274                                         # Register it in the output object...
1275                                         # Replace unnecessary URL escape codes with their equivalent characters
1276                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1277                                         $this->mOutput->addExternalLink( $pasteurized );
1278                                 }
1279                                 $s .= $text . $trail;
1280                         } else {
1281                                 $s .= $protocol . $remainder;
1282                         }
1283                 }
1284                 wfProfileOut( $fname );
1285                 return $s;
1286         }
1287
1288         /**
1289          * Replace unusual URL escape codes with their equivalent characters
1290          * @param string
1291          * @return string
1292          * @static
1293          * @fixme This can merge genuinely required bits in the path or query string,
1294          *        breaking legit URLs. A proper fix would treat the various parts of
1295          *        the URL differently; as a workaround, just use the output for
1296          *        statistical records, not for actual linking/output.
1297          */
1298         function replaceUnusualEscapes( $url ) {
1299                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1300                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1301         }
1302
1303         /**
1304          * Callback function used in replaceUnusualEscapes().
1305          * Replaces unusual URL escape codes with their equivalent character
1306          * @static
1307          * @access private
1308          */
1309         function replaceUnusualEscapesCallback( $matches ) {
1310                 $char = urldecode( $matches[0] );
1311                 $ord = ord( $char );
1312                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1313                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1314                         // No, shouldn't be escaped
1315                         return $char;
1316                 } else {
1317                         // Yes, leave it escaped
1318                         return $matches[0];
1319                 }
1320         }
1321
1322         /**
1323          * make an image if it's allowed, either through the global
1324          * option or through the exception
1325          * @access private
1326          */
1327         function maybeMakeExternalImage( $url ) {
1328                 $sk =& $this->mOptions->getSkin();
1329                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1330                 $imagesexception = !empty($imagesfrom);
1331                 $text = false;
1332                 if ( $this->mOptions->getAllowExternalImages()
1333                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1334                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1335                                 # Image found
1336                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1337                         }
1338                 }
1339                 return $text;
1340         }
1341
1342         /**
1343          * Process [[ ]] wikilinks
1344          *
1345          * @access private
1346          */
1347         function replaceInternalLinks( $s ) {
1348                 global $wgContLang;
1349                 static $fname = 'Parser::replaceInternalLinks' ;
1350
1351                 wfProfileIn( $fname );
1352
1353                 wfProfileIn( $fname.'-setup' );
1354                 static $tc = FALSE;
1355                 # the % is needed to support urlencoded titles as well
1356                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1357
1358                 $sk =& $this->mOptions->getSkin();
1359
1360                 #split the entire text string on occurences of [[
1361                 $a = explode( '[[', ' ' . $s );
1362                 #get the first element (all text up to first [[), and remove the space we added
1363                 $s = array_shift( $a );
1364                 $s = substr( $s, 1 );
1365
1366                 # Match a link having the form [[namespace:link|alternate]]trail
1367                 static $e1 = FALSE;
1368                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1369                 # Match cases where there is no "]]", which might still be images
1370                 static $e1_img = FALSE;
1371                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1372                 # Match the end of a line for a word that's not followed by whitespace,
1373                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1374                 $e2 = wfMsgForContent( 'linkprefix' );
1375
1376                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1377
1378                 if( is_null( $this->mTitle ) ) {
1379                         wfDebugDieBacktrace( 'nooo' );
1380                 }
1381                 $nottalk = !$this->mTitle->isTalkPage();
1382
1383                 if ( $useLinkPrefixExtension ) {
1384                         if ( preg_match( $e2, $s, $m ) ) {
1385                                 $first_prefix = $m[2];
1386                         } else {
1387                                 $first_prefix = false;
1388                         }
1389                 } else {
1390                         $prefix = '';
1391                 }
1392
1393                 $selflink = $this->mTitle->getPrefixedText();
1394                 wfProfileOut( $fname.'-setup' );
1395
1396                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1397                 $useSubpages = $this->areSubpagesAllowed();
1398
1399                 # Loop for each link
1400                 for ($k = 0; isset( $a[$k] ); $k++) {
1401                         $line = $a[$k];
1402                         if ( $useLinkPrefixExtension ) {
1403                                 wfProfileIn( $fname.'-prefixhandling' );
1404                                 if ( preg_match( $e2, $s, $m ) ) {
1405                                         $prefix = $m[2];
1406                                         $s = $m[1];
1407                                 } else {
1408                                         $prefix='';
1409                                 }
1410                                 # first link
1411                                 if($first_prefix) {
1412                                         $prefix = $first_prefix;
1413                                         $first_prefix = false;
1414                                 }
1415                                 wfProfileOut( $fname.'-prefixhandling' );
1416                         }
1417
1418                         $might_be_img = false;
1419
1420                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1421                                 $text = $m[2];
1422                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1423                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1424                                 # the real problem is with the $e1 regex
1425                                 # See bug 1300.
1426                                 #
1427                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1428                                 # and no image is in sight. See bug 2095.
1429                                 #
1430                                 if( $text !== '' &&
1431                                         preg_match( "/^\](.*)/s", $m[3], $n ) &&
1432                                         strpos($text, '[') !== false
1433                                 )
1434                                 {
1435                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1436                                         $m[3] = $n[1];
1437                                 }
1438                                 # fix up urlencoded title texts
1439                                 if(preg_match('/%/', $m[1] ))
1440                                         # Should anchors '#' also be rejected?
1441                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1442                                 $trail = $m[3];
1443                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1444                                 $might_be_img = true;
1445                                 $text = $m[2];
1446                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1447                                 $trail = "";
1448                         } else { # Invalid form; output directly
1449                                 $s .= $prefix . '[[' . $line ;
1450                                 continue;
1451                         }
1452
1453                         # Don't allow internal links to pages containing
1454                         # PROTO: where PROTO is a valid URL protocol; these
1455                         # should be external links.
1456                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1457                                 $s .= $prefix . '[[' . $line ;
1458                                 continue;
1459                         }
1460
1461                         # Make subpage if necessary
1462                         if( $useSubpages ) {
1463                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1464                         } else {
1465                                 $link = $m[1];
1466                         }
1467
1468                         $noforce = (substr($m[1], 0, 1) != ':');
1469                         if (!$noforce) {
1470                                 # Strip off leading ':'
1471                                 $link = substr($link, 1);
1472                         }
1473
1474                         $nt = Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1475                         if( !$nt ) {
1476                                 $s .= $prefix . '[[' . $line;
1477                                 continue;
1478                         }
1479
1480                         #check other language variants of the link
1481                         #if the article does not exist
1482                         if( $checkVariantLink
1483                             && $nt->getArticleID() == 0 ) {
1484                                 $wgContLang->findVariantLink($link, $nt);
1485                         }
1486
1487                         $ns = $nt->getNamespace();
1488                         $iw = $nt->getInterWiki();
1489
1490                         if ($might_be_img) { # if this is actually an invalid link
1491                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1492                                         $found = false;
1493                                         while (isset ($a[$k+1]) ) {
1494                                                 #look at the next 'line' to see if we can close it there
1495                                                 $spliced = array_splice( $a, $k + 1, 1 );
1496                                                 $next_line = array_shift( $spliced );
1497                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1498                                                 # the first ]] closes the inner link, the second the image
1499                                                         $found = true;
1500                                                         $text .= '[[' . $m[1];
1501                                                         $trail = $m[2];
1502                                                         break;
1503                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1504                                                         #if there's exactly one ]] that's fine, we'll keep looking
1505                                                         $text .= '[[' . $m[0];
1506                                                 } else {
1507                                                         #if $next_line is invalid too, we need look no further
1508                                                         $text .= '[[' . $next_line;
1509                                                         break;
1510                                                 }
1511                                         }
1512                                         if ( !$found ) {
1513                                                 # we couldn't find the end of this imageLink, so output it raw
1514                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1515                                                 $text = $this->replaceInternalLinks($text);
1516                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1517                                                 # note: no $trail, because without an end, there *is* no trail
1518                                                 continue;
1519                                         }
1520                                 } else { #it's not an image, so output it raw
1521                                         $s .= $prefix . '[[' . $link . '|' . $text;
1522                                         # note: no $trail, because without an end, there *is* no trail
1523                                         continue;
1524                                 }
1525                         }
1526
1527                         $wasblank = ( '' == $text );
1528                         if( $wasblank ) $text = $link;
1529
1530
1531                         # Link not escaped by : , create the various objects
1532                         if( $noforce ) {
1533
1534                                 # Interwikis
1535                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1536                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1537                                         $s = rtrim($s . "\n");
1538                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1539                                         continue;
1540                                 }
1541
1542                                 if ( $ns == NS_IMAGE ) {
1543                                         wfProfileIn( "$fname-image" );
1544                                         if ( !wfIsBadImage( $nt->getDBkey() ) ) {
1545                                                 # recursively parse links inside the image caption
1546                                                 # actually, this will parse them in any other parameters, too,
1547                                                 # but it might be hard to fix that, and it doesn't matter ATM
1548                                                 $text = $this->replaceExternalLinks($text);
1549                                                 $text = $this->replaceInternalLinks($text);
1550
1551                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1552                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1553                                                 $this->mOutput->addImage( $nt->getDBkey() );
1554
1555                                                 wfProfileOut( "$fname-image" );
1556                                                 continue;
1557                                         }
1558                                         wfProfileOut( "$fname-image" );
1559
1560                                 }
1561
1562                                 if ( $ns == NS_CATEGORY ) {
1563                                         wfProfileIn( "$fname-category" );
1564                                         $s = rtrim($s . "\n"); # bug 87
1565
1566                                         if ( $wasblank ) {
1567                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1568                                                         $sortkey = $this->mTitle->getText();
1569                                                 } else {
1570                                                         $sortkey = $this->mTitle->getPrefixedText();
1571                                                 }
1572                                         } else {
1573                                                 $sortkey = $text;
1574                                         }
1575                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1576                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1577                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1578
1579                                         /**
1580                                          * Strip the whitespace Category links produce, see bug 87
1581                                          * @todo We might want to use trim($tmp, "\n") here.
1582                                          */
1583                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1584
1585                                         wfProfileOut( "$fname-category" );
1586                                         continue;
1587                                 }
1588                         }
1589
1590                         if( ( $nt->getPrefixedText() === $selflink ) &&
1591                             ( $nt->getFragment() === '' ) ) {
1592                                 # Self-links are handled specially; generally de-link and change to bold.
1593                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1594                                 continue;
1595                         }
1596
1597                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1598                         if( $ns == NS_MEDIA ) {
1599                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1600                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1601                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1602                                 $this->mOutput->addImage( $nt->getDBkey() );
1603                                 continue;
1604                         } elseif( $ns == NS_SPECIAL ) {
1605                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1606                                 continue;
1607                         } elseif( $ns == NS_IMAGE ) {
1608                                 $img = Image::newFromTitle( $nt );
1609                                 if( $img->exists() ) {
1610                                         // Force a blue link if the file exists; may be a remote
1611                                         // upload on the shared repository, and we want to see its
1612                                         // auto-generated page.
1613                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1614                                         continue;
1615                                 }
1616                         }
1617                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1618                 }
1619                 wfProfileOut( $fname );
1620                 return $s;
1621         }
1622
1623         /**
1624          * Make a link placeholder. The text returned can be later resolved to a real link with
1625          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1626          * parsing of interwiki links, and secondly to allow all extistence checks and
1627          * article length checks (for stub links) to be bundled into a single query.
1628          *
1629          */
1630         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1631                 if ( ! is_object($nt) ) {
1632                         # Fail gracefully
1633                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1634                 } else {
1635                         # Separate the link trail from the rest of the link
1636                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1637
1638                         if ( $nt->isExternal() ) {
1639                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1640                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1641                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1642                         } else {
1643                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1644                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1645                                 $this->mLinkHolders['queries'][] = $query;
1646                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1647                                 $this->mLinkHolders['titles'][] = $nt;
1648
1649                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1650                         }
1651                 }
1652                 return $retVal;
1653         }
1654
1655         /**
1656          * Render a forced-blue link inline; protect against double expansion of
1657          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1658          * Since this little disaster has to split off the trail text to avoid
1659          * breaking URLs in the following text without breaking trails on the
1660          * wiki links, it's been made into a horrible function.
1661          *
1662          * @param Title $nt
1663          * @param string $text
1664          * @param string $query
1665          * @param string $trail
1666          * @param string $prefix
1667          * @return string HTML-wikitext mix oh yuck
1668          */
1669         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1670                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1671                 $sk =& $this->mOptions->getSkin();
1672                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1673                 return $this->armorLinks( $link ) . $trail;
1674         }
1675
1676         /**
1677          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1678          * going to go through further parsing steps before inline URL expansion.
1679          *
1680          * In particular this is important when using action=render, which causes
1681          * full URLs to be included.
1682          *
1683          * Oh man I hate our multi-layer parser!
1684          *
1685          * @param string more-or-less HTML
1686          * @return string less-or-more HTML with NOPARSE bits
1687          */
1688         function armorLinks( $text ) {
1689                 return preg_replace( "/\b(" . wfUrlProtocols() . ')/',
1690                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1691         }
1692
1693         /**
1694          * Return true if subpage links should be expanded on this page.
1695          * @return bool
1696          */
1697         function areSubpagesAllowed() {
1698                 # Some namespaces don't allow subpages
1699                 global $wgNamespacesWithSubpages;
1700                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1701         }
1702
1703         /**
1704          * Handle link to subpage if necessary
1705          * @param string $target the source of the link
1706          * @param string &$text the link text, modified as necessary
1707          * @return string the full name of the link
1708          * @access private
1709          */
1710         function maybeDoSubpageLink($target, &$text) {
1711                 # Valid link forms:
1712                 # Foobar -- normal
1713                 # :Foobar -- override special treatment of prefix (images, language links)
1714                 # /Foobar -- convert to CurrentPage/Foobar
1715                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1716                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1717                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1718
1719                 $fname = 'Parser::maybeDoSubpageLink';
1720                 wfProfileIn( $fname );
1721                 $ret = $target; # default return value is no change
1722
1723                 # Some namespaces don't allow subpages,
1724                 # so only perform processing if subpages are allowed
1725                 if( $this->areSubpagesAllowed() ) {
1726                         # Look at the first character
1727                         if( $target != '' && $target{0} == '/' ) {
1728                                 # / at end means we don't want the slash to be shown
1729                                 if( substr( $target, -1, 1 ) == '/' ) {
1730                                         $target = substr( $target, 1, -1 );
1731                                         $noslash = $target;
1732                                 } else {
1733                                         $noslash = substr( $target, 1 );
1734                                 }
1735
1736                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1737                                 if( '' === $text ) {
1738                                         $text = $target;
1739                                 } # this might be changed for ugliness reasons
1740                         } else {
1741                                 # check for .. subpage backlinks
1742                                 $dotdotcount = 0;
1743                                 $nodotdot = $target;
1744                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1745                                         ++$dotdotcount;
1746                                         $nodotdot = substr( $nodotdot, 3 );
1747                                 }
1748                                 if($dotdotcount > 0) {
1749                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1750                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1751                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1752                                                 # / at the end means don't show full path
1753                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1754                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1755                                                         if( '' === $text ) {
1756                                                                 $text = $nodotdot;
1757                                                         }
1758                                                 }
1759                                                 $nodotdot = trim( $nodotdot );
1760                                                 if( $nodotdot != '' ) {
1761                                                         $ret .= '/' . $nodotdot;
1762                                                 }
1763                                         }
1764                                 }
1765                         }
1766                 }
1767
1768                 wfProfileOut( $fname );
1769                 return $ret;
1770         }
1771
1772         /**#@+
1773          * Used by doBlockLevels()
1774          * @access private
1775          */
1776         /* private */ function closeParagraph() {
1777                 $result = '';
1778                 if ( '' != $this->mLastSection ) {
1779                         $result = '</' . $this->mLastSection  . ">\n";
1780                 }
1781                 $this->mInPre = false;
1782                 $this->mLastSection = '';
1783                 return $result;
1784         }
1785         # getCommon() returns the length of the longest common substring
1786         # of both arguments, starting at the beginning of both.
1787         #
1788         /* private */ function getCommon( $st1, $st2 ) {
1789                 $fl = strlen( $st1 );
1790                 $shorter = strlen( $st2 );
1791                 if ( $fl < $shorter ) { $shorter = $fl; }
1792
1793                 for ( $i = 0; $i < $shorter; ++$i ) {
1794                         if ( $st1{$i} != $st2{$i} ) { break; }
1795                 }
1796                 return $i;
1797         }
1798         # These next three functions open, continue, and close the list
1799         # element appropriate to the prefix character passed into them.
1800         #
1801         /* private */ function openList( $char ) {
1802                 $result = $this->closeParagraph();
1803
1804                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1805                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1806                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1807                 else if ( ';' == $char ) {
1808                         $result .= '<dl><dt>';
1809                         $this->mDTopen = true;
1810                 }
1811                 else { $result = '<!-- ERR 1 -->'; }
1812
1813                 return $result;
1814         }
1815
1816         /* private */ function nextItem( $char ) {
1817                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1818                 else if ( ':' == $char || ';' == $char ) {
1819                         $close = '</dd>';
1820                         if ( $this->mDTopen ) { $close = '</dt>'; }
1821                         if ( ';' == $char ) {
1822                                 $this->mDTopen = true;
1823                                 return $close . '<dt>';
1824                         } else {
1825                                 $this->mDTopen = false;
1826                                 return $close . '<dd>';
1827                         }
1828                 }
1829                 return '<!-- ERR 2 -->';
1830         }
1831
1832         /* private */ function closeList( $char ) {
1833                 if ( '*' == $char ) { $text = '</li></ul>'; }
1834                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1835                 else if ( ':' == $char ) {
1836                         if ( $this->mDTopen ) {
1837                                 $this->mDTopen = false;
1838                                 $text = '</dt></dl>';
1839                         } else {
1840                                 $text = '</dd></dl>';
1841                         }
1842                 }
1843                 else {  return '<!-- ERR 3 -->'; }
1844                 return $text."\n";
1845         }
1846         /**#@-*/
1847
1848         /**
1849          * Make lists from lines starting with ':', '*', '#', etc.
1850          *
1851          * @access private
1852          * @return string the lists rendered as HTML
1853          */
1854         function doBlockLevels( $text, $linestart ) {
1855                 $fname = 'Parser::doBlockLevels';
1856                 wfProfileIn( $fname );
1857
1858                 # Parsing through the text line by line.  The main thing
1859                 # happening here is handling of block-level elements p, pre,
1860                 # and making lists from lines starting with * # : etc.
1861                 #
1862                 $textLines = explode( "\n", $text );
1863
1864                 $lastPrefix = $output = '';
1865                 $this->mDTopen = $inBlockElem = false;
1866                 $prefixLength = 0;
1867                 $paragraphStack = false;
1868
1869                 if ( !$linestart ) {
1870                         $output .= array_shift( $textLines );
1871                 }
1872                 foreach ( $textLines as $oLine ) {
1873                         $lastPrefixLength = strlen( $lastPrefix );
1874                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1875                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1876                         if ( !$this->mInPre ) {
1877                                 # Multiple prefixes may abut each other for nested lists.
1878                                 $prefixLength = strspn( $oLine, '*#:;' );
1879                                 $pref = substr( $oLine, 0, $prefixLength );
1880
1881                                 # eh?
1882                                 $pref2 = str_replace( ';', ':', $pref );
1883                                 $t = substr( $oLine, $prefixLength );
1884                                 $this->mInPre = !empty($preOpenMatch);
1885                         } else {
1886                                 # Don't interpret any other prefixes in preformatted text
1887                                 $prefixLength = 0;
1888                                 $pref = $pref2 = '';
1889                                 $t = $oLine;
1890                         }
1891
1892                         # List generation
1893                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1894                                 # Same as the last item, so no need to deal with nesting or opening stuff
1895                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1896                                 $paragraphStack = false;
1897
1898                                 if ( substr( $pref, -1 ) == ';') {
1899                                         # The one nasty exception: definition lists work like this:
1900                                         # ; title : definition text
1901                                         # So we check for : in the remainder text to split up the
1902                                         # title and definition, without b0rking links.
1903                                         $term = $t2 = '';
1904                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1905                                                 $t = $t2;
1906                                                 $output .= $term . $this->nextItem( ':' );
1907                                         }
1908                                 }
1909                         } elseif( $prefixLength || $lastPrefixLength ) {
1910                                 # Either open or close a level...
1911                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1912                                 $paragraphStack = false;
1913
1914                                 while( $commonPrefixLength < $lastPrefixLength ) {
1915                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1916                                         --$lastPrefixLength;
1917                                 }
1918                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1919                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1920                                 }
1921                                 while ( $prefixLength > $commonPrefixLength ) {
1922                                         $char = substr( $pref, $commonPrefixLength, 1 );
1923                                         $output .= $this->openList( $char );
1924
1925                                         if ( ';' == $char ) {
1926                                                 # FIXME: This is dupe of code above
1927                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1928                                                         $t = $t2;
1929                                                         $output .= $term . $this->nextItem( ':' );
1930                                                 }
1931                                         }
1932                                         ++$commonPrefixLength;
1933                                 }
1934                                 $lastPrefix = $pref2;
1935                         }
1936                         if( 0 == $prefixLength ) {
1937                                 wfProfileIn( "$fname-paragraph" );
1938                                 # No prefix (not in list)--go to paragraph mode
1939                                 // XXX: use a stack for nestable elements like span, table and div
1940                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1941                                 $closematch = preg_match(
1942                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1943                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1944                                 if ( $openmatch or $closematch ) {
1945                                         $paragraphStack = false;
1946                                         $output .= $this->closeParagraph();
1947                                         if ( $preOpenMatch and !$preCloseMatch ) {
1948                                                 $this->mInPre = true;
1949                                         }
1950                                         if ( $closematch ) {
1951                                                 $inBlockElem = false;
1952                                         } else {
1953                                                 $inBlockElem = true;
1954                                         }
1955                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1956                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1957                                                 // pre
1958                                                 if ($this->mLastSection != 'pre') {
1959                                                         $paragraphStack = false;
1960                                                         $output .= $this->closeParagraph().'<pre>';
1961                                                         $this->mLastSection = 'pre';
1962                                                 }
1963                                                 $t = substr( $t, 1 );
1964                                         } else {
1965                                                 // paragraph
1966                                                 if ( '' == trim($t) ) {
1967                                                         if ( $paragraphStack ) {
1968                                                                 $output .= $paragraphStack.'<br />';
1969                                                                 $paragraphStack = false;
1970                                                                 $this->mLastSection = 'p';
1971                                                         } else {
1972                                                                 if ($this->mLastSection != 'p' ) {
1973                                                                         $output .= $this->closeParagraph();
1974                                                                         $this->mLastSection = '';
1975                                                                         $paragraphStack = '<p>';
1976                                                                 } else {
1977                                                                         $paragraphStack = '</p><p>';
1978                                                                 }
1979                                                         }
1980                                                 } else {
1981                                                         if ( $paragraphStack ) {
1982                                                                 $output .= $paragraphStack;
1983                                                                 $paragraphStack = false;
1984                                                                 $this->mLastSection = 'p';
1985                                                         } else if ($this->mLastSection != 'p') {
1986                                                                 $output .= $this->closeParagraph().'<p>';
1987                                                                 $this->mLastSection = 'p';
1988                                                         }
1989                                                 }
1990                                         }
1991                                 }
1992                                 wfProfileOut( "$fname-paragraph" );
1993                         }
1994                         // somewhere above we forget to get out of pre block (bug 785)
1995                         if($preCloseMatch && $this->mInPre) {
1996                                 $this->mInPre = false;
1997                         }
1998                         if ($paragraphStack === false) {
1999                                 $output .= $t."\n";
2000                         }
2001                 }
2002                 while ( $prefixLength ) {
2003                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2004                         --$prefixLength;
2005                 }
2006                 if ( '' != $this->mLastSection ) {
2007                         $output .= '</' . $this->mLastSection . '>';
2008                         $this->mLastSection = '';
2009                 }
2010
2011                 wfProfileOut( $fname );
2012                 return $output;
2013         }
2014
2015         /**
2016          * Split up a string on ':', ignoring any occurences inside
2017          * <a>..</a> or <span>...</span>
2018          * @param string $str the string to split
2019          * @param string &$before set to everything before the ':'
2020          * @param string &$after set to everything after the ':'
2021          * return string the position of the ':', or false if none found
2022          */
2023         function findColonNoLinks($str, &$before, &$after) {
2024                 # I wonder if we should make this count all tags, not just <a>
2025                 # and <span>. That would prevent us from matching a ':' that
2026                 # comes in the middle of italics other such formatting....
2027                 # -- Wil
2028                 $fname = 'Parser::findColonNoLinks';
2029                 wfProfileIn( $fname );
2030                 $pos = 0;
2031                 do {
2032                         $colon = strpos($str, ':', $pos);
2033
2034                         if ($colon !== false) {
2035                                 $before = substr($str, 0, $colon);
2036                                 $after = substr($str, $colon + 1);
2037
2038                                 # Skip any ':' within <a> or <span> pairs
2039                                 $a = substr_count($before, '<a');
2040                                 $s = substr_count($before, '<span');
2041                                 $ca = substr_count($before, '</a>');
2042                                 $cs = substr_count($before, '</span>');
2043
2044                                 if ($a <= $ca and $s <= $cs) {
2045                                         # Tags are balanced before ':'; ok
2046                                         break;
2047                                 }
2048                                 $pos = $colon + 1;
2049                         }
2050                 } while ($colon !== false);
2051                 wfProfileOut( $fname );
2052                 return $colon;
2053         }
2054
2055         /**
2056          * Return value of a magic variable (like PAGENAME)
2057          *
2058          * @access private
2059          */
2060         function getVariableValue( $index ) {
2061                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2062
2063                 /**
2064                  * Some of these require message or data lookups and can be
2065                  * expensive to check many times.
2066                  */
2067                 static $varCache = array();
2068                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) )
2069                         if ( isset( $varCache[$index] ) )
2070                                 return $varCache[$index];
2071
2072                 $ts = time();
2073                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2074
2075                 switch ( $index ) {
2076                         case MAG_CURRENTMONTH:
2077                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2078                         case MAG_CURRENTMONTHNAME:
2079                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2080                         case MAG_CURRENTMONTHNAMEGEN:
2081                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2082                         case MAG_CURRENTMONTHABBREV:
2083                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2084                         case MAG_CURRENTDAY:
2085                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2086                         case MAG_CURRENTDAY2:
2087                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2088                         case MAG_PAGENAME:
2089                                 return $this->mTitle->getText();
2090                         case MAG_PAGENAMEE:
2091                                 return $this->mTitle->getPartialURL();
2092                         case MAG_FULLPAGENAME:
2093                                 return $this->mTitle->getPrefixedText();
2094                         case MAG_FULLPAGENAMEE:
2095                                 return $this->mTitle->getPrefixedURL();
2096                         case MAG_SUBPAGENAME:
2097                                 return $this->mTitle->getSubpageText();
2098                         case MAG_SUBPAGENAMEE:
2099                                 return $this->mTitle->getSubpageUrlForm();
2100                         case MAG_REVISIONID:
2101                                 return $this->mRevisionId;
2102                         case MAG_NAMESPACE:
2103                                 return $wgContLang->getNsText( $this->mTitle->getNamespace() );
2104                         case MAG_NAMESPACEE:
2105                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2106                         case MAG_CURRENTDAYNAME:
2107                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2108                         case MAG_CURRENTYEAR:
2109                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2110                         case MAG_CURRENTTIME:
2111                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2112                         case MAG_CURRENTWEEK:
2113                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2114                                 // int to remove the padding
2115                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2116                         case MAG_CURRENTDOW:
2117                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2118                         case MAG_NUMBEROFARTICLES:
2119                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
2120                         case MAG_NUMBEROFFILES:
2121                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfFiles() );
2122                         case MAG_SITENAME:
2123                                 return $wgSitename;
2124                         case MAG_SERVER:
2125                                 return $wgServer;
2126                         case MAG_SERVERNAME:
2127                                 return $wgServerName;
2128                         case MAG_SCRIPTPATH:
2129                                 return $wgScriptPath;
2130                         default:
2131                                 $ret = null;
2132                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2133                                         return $ret;
2134                                 else
2135                                         return null;
2136                 }
2137         }
2138
2139         /**
2140          * initialise the magic variables (like CURRENTMONTHNAME)
2141          *
2142          * @access private
2143          */
2144         function initialiseVariables() {
2145                 $fname = 'Parser::initialiseVariables';
2146                 wfProfileIn( $fname );
2147                 global $wgVariableIDs;
2148                 $this->mVariables = array();
2149                 foreach ( $wgVariableIDs as $id ) {
2150                         $mw =& MagicWord::get( $id );
2151                         $mw->addToArray( $this->mVariables, $id );
2152                 }
2153                 wfProfileOut( $fname );
2154         }
2155
2156         /**
2157          * parse any parentheses in format ((title|part|part))
2158          * and call callbacks to get a replacement text for any found piece
2159          *
2160          * @param string $text The text to parse
2161          * @param array $callbacks rules in form:
2162          *     '{' => array(                            # opening parentheses
2163          *                                      'end' => '}',   # closing parentheses
2164          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2165          *                                                                4 => callback         # replacement callback to call if {{{{..}}}} is found
2166          *                                                                )
2167          *                                      )
2168          * @access private
2169          */
2170         function replace_callback ($text, $callbacks) {
2171                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2172                 $lastOpeningBrace = -1;                 # last not closed parentheses
2173
2174                 for ($i = 0; $i < strlen($text); $i++) {
2175                         # check for any opening brace
2176                         $rule = null;
2177                         $nextPos = -1;
2178                         foreach ($callbacks as $key => $value) {
2179                                 $pos = strpos ($text, $key, $i);
2180                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)) {
2181                                         $rule = $value;
2182                                         $nextPos = $pos;
2183                                 }
2184                         }
2185
2186                         if ($lastOpeningBrace >= 0) {
2187                                 $pos = strpos ($text, $openingBraceStack[$lastOpeningBrace]['braceEnd'], $i);
2188
2189                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2190                                         $rule = null;
2191                                         $nextPos = $pos;
2192                                 }
2193
2194                                 $pos = strpos ($text, '|', $i);
2195
2196                                 if (false !== $pos && (-1 == $nextPos || $pos < $nextPos)){
2197                                         $rule = null;
2198                                         $nextPos = $pos;
2199                                 }
2200                         }
2201
2202                         if ($nextPos == -1)
2203                                 break;
2204
2205                         $i = $nextPos;
2206
2207                         # found openning brace, lets add it to parentheses stack
2208                         if (null != $rule) {
2209                                 $piece = array('brace' => $text[$i],
2210                                                            'braceEnd' => $rule['end'],
2211                                                            'count' => 1,
2212                                                            'title' => '',
2213                                                            'parts' => null);
2214
2215                                 # count openning brace characters
2216                                 while ($i+1 < strlen($text) && $text[$i+1] == $piece['brace']) {
2217                                         $piece['count']++;
2218                                         $i++;
2219                                 }
2220
2221                                 $piece['startAt'] = $i+1;
2222                                 $piece['partStart'] = $i+1;
2223
2224                                 # we need to add to stack only if openning brace count is enough for any given rule
2225                                 foreach ($rule['cb'] as $cnt => $fn) {
2226                                         if ($piece['count'] >= $cnt) {
2227                                                 $lastOpeningBrace ++;
2228                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2229                                                 break;
2230                                         }
2231                                 }
2232
2233                                 continue;
2234                         }
2235                         else if ($lastOpeningBrace >= 0) {
2236                                 # first check if it is a closing brace
2237                                 if ($openingBraceStack[$lastOpeningBrace]['braceEnd'] == $text[$i]) {
2238                                         # lets check if it is enough characters for closing brace
2239                                         $count = 1;
2240                                         while ($i+$count < strlen($text) && $text[$i+$count] == $text[$i])
2241                                                 $count++;
2242
2243                                         # if there are more closing parentheses than opening ones, we parse less
2244                                         if ($openingBraceStack[$lastOpeningBrace]['count'] < $count)
2245                                                 $count = $openingBraceStack[$lastOpeningBrace]['count'];
2246
2247                                         # check for maximum matching characters (if there are 5 closing characters, we will probably need only 3 - depending on the rules)
2248                                         $matchingCount = 0;
2249                                         $matchingCallback = null;
2250                                         foreach ($callbacks[$openingBraceStack[$lastOpeningBrace]['brace']]['cb'] as $cnt => $fn) {
2251                                                 if ($count >= $cnt && $matchingCount < $cnt) {
2252                                                         $matchingCount = $cnt;
2253                                                         $matchingCallback = $fn;
2254                                                 }
2255                                         }
2256
2257                                         if ($matchingCount == 0) {
2258                                                 $i += $count - 1;
2259                                                 continue;
2260                                         }
2261
2262                                         # lets set a title or last part (if '|' was found)
2263                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts'])
2264                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2265                                         else
2266                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2267
2268                                         $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2269                                         $pieceEnd = $i + $matchingCount;
2270
2271                                         if( is_callable( $matchingCallback ) ) {
2272                                                 $cbArgs = array (
2273                                                                                  'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2274                                                                                  'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2275                                                                                  'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2276                                                                                  'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == '\n')),
2277                                                                                  );
2278                                                 # finally we can call a user callback and replace piece of text
2279                                                 $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2280                                                 $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2281                                                 $i = $pieceStart + strlen($replaceWith) - 1;
2282                                         }
2283                                         else {
2284                                                 # null value for callback means that parentheses should be parsed, but not replaced
2285                                                 $i += $matchingCount - 1;
2286                                         }
2287
2288                                         # reset last openning parentheses, but keep it in case there are unused characters
2289                                         $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2290                                                                    'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2291                                                                    'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2292                                                                    'title' => '',
2293                                                                    'parts' => null,
2294                                                                    'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2295                                         $openingBraceStack[$lastOpeningBrace--] = null;
2296
2297                                         if ($matchingCount < $piece['count']) {
2298                                                 $piece['count'] -= $matchingCount;
2299                                                 $piece['startAt'] -= $matchingCount;
2300                                                 $piece['partStart'] = $piece['startAt'];
2301                                                 # do we still qualify for any callback with remaining count?
2302                                                 foreach ($callbacks[$piece['brace']]['cb'] as $cnt => $fn) {
2303                                                         if ($piece['count'] >= $cnt) {
2304                                                                 $lastOpeningBrace ++;
2305                                                                 $openingBraceStack[$lastOpeningBrace] = $piece;
2306                                                                 break;
2307                                                         }
2308                                                 }
2309                                         }
2310                                         continue;
2311                                 }
2312
2313                                 # lets set a title if it is a first separator, or next part otherwise
2314                                 if ($text[$i] == '|') {
2315                                         if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2316                                                 $openingBraceStack[$lastOpeningBrace]['title'] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2317                                                 $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2318                                         }
2319                                         else
2320                                                 $openingBraceStack[$lastOpeningBrace]['parts'][] = substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'], $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2321
2322                                         $openingBraceStack[$lastOpeningBrace]['partStart'] = $i + 1;
2323                                 }
2324                         }
2325                 }
2326
2327                 return $text;
2328         }
2329
2330         /**
2331          * Replace magic variables, templates, and template arguments
2332          * with the appropriate text. Templates are substituted recursively,
2333          * taking care to avoid infinite loops.
2334          *
2335          * Note that the substitution depends on value of $mOutputType:
2336          *  OT_WIKI: only {{subst:}} templates
2337          *  OT_MSG: only magic variables
2338          *  OT_HTML: all templates and magic variables
2339          *
2340          * @param string $tex The text to transform
2341          * @param array $args Key-value pairs representing template parameters to substitute
2342          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2343          * @access private
2344          */
2345         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2346                 # Prevent too big inclusions
2347                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
2348                         return $text;
2349                 }
2350
2351                 $fname = 'Parser::replaceVariables';
2352                 wfProfileIn( $fname );
2353
2354                 # This function is called recursively. To keep track of arguments we need a stack:
2355                 array_push( $this->mArgStack, $args );
2356
2357                 $braceCallbacks = array();
2358                 if ( !$argsOnly ) {
2359                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2360                 }
2361                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
2362                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2363                 }
2364                 $callbacks = array();
2365                 $callbacks['{'] = array('end' => '}', 'cb' => $braceCallbacks);
2366                 $callbacks['['] = array('end' => ']', 'cb' => array(2=>null));
2367                 $text = $this->replace_callback ($text, $callbacks);
2368
2369                 array_pop( $this->mArgStack );
2370
2371                 wfProfileOut( $fname );
2372                 return $text;
2373         }
2374
2375         /**
2376          * Replace magic variables
2377          * @access private
2378          */
2379         function variableSubstitution( $matches ) {
2380                 $fname = 'Parser::variableSubstitution';
2381                 $varname = $matches[1];
2382                 wfProfileIn( $fname );
2383                 if ( !$this->mVariables ) {
2384                         $this->initialiseVariables();
2385                 }
2386                 $skip = false;
2387                 if ( $this->mOutputType == OT_WIKI ) {
2388                         # Do only magic variables prefixed by SUBST
2389                         $mwSubst =& MagicWord::get( MAG_SUBST );
2390                         if (!$mwSubst->matchStartAndRemove( $varname ))
2391                                 $skip = true;
2392                         # Note that if we don't substitute the variable below,
2393                         # we don't remove the {{subst:}} magic word, in case
2394                         # it is a template rather than a magic variable.
2395                 }
2396                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2397                         $id = $this->mVariables[$varname];
2398                         $text = $this->getVariableValue( $id );
2399                         $this->mOutput->mContainsOldMagic = true;
2400                 } else {
2401                         $text = $matches[0];
2402                 }
2403                 wfProfileOut( $fname );
2404                 return $text;
2405         }
2406
2407         # Split template arguments
2408         function getTemplateArgs( $argsString ) {
2409                 if ( $argsString === '' ) {
2410                         return array();
2411                 }
2412
2413                 $args = explode( '|', substr( $argsString, 1 ) );
2414
2415                 # If any of the arguments contains a '[[' but no ']]', it needs to be
2416                 # merged with the next arg because the '|' character between belongs
2417                 # to the link syntax and not the template parameter syntax.
2418                 $argc = count($args);
2419
2420                 for ( $i = 0; $i < $argc-1; $i++ ) {
2421                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
2422                                 $args[$i] .= '|'.$args[$i+1];
2423                                 array_splice($args, $i+1, 1);
2424                                 $i--;
2425                                 $argc--;
2426                         }
2427                 }
2428
2429                 return $args;
2430         }
2431
2432         /**
2433          * Return the text of a template, after recursively
2434          * replacing any variables or templates within the template.
2435          *
2436          * @param array $piece The parts of the template
2437          *  $piece['text']: matched text
2438          *  $piece['title']: the title, i.e. the part before the |
2439          *  $piece['parts']: the parameter array
2440          * @return string the text of the template
2441          * @access private
2442          */
2443         function braceSubstitution( $piece ) {
2444                 global $wgContLang, $wgAllowDisplayTitle;
2445                 $fname = 'Parser::braceSubstitution';
2446                 wfProfileIn( $fname );
2447
2448                 # Flags
2449                 $found = false;             # $text has been filled
2450                 $nowiki = false;            # wiki markup in $text should be escaped
2451                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2452                 $noargs = false;            # Don't replace triple-brace arguments in $text
2453                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2454                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2455                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2456
2457                 # Title object, where $text came from
2458                 $title = NULL;
2459
2460                 $linestart = '';
2461
2462                 # $part1 is the bit before the first |, and must contain only title characters
2463                 # $args is a list of arguments, starting from index 0, not including $part1
2464
2465                 $part1 = $piece['title'];
2466                 # If the third subpattern matched anything, it will start with |
2467
2468                 if (null == $piece['parts']) {
2469                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2470                         if ($replaceWith != $piece['text']) {
2471                                 $text = $replaceWith;
2472                                 $found = true;
2473                                 $noparse = true;
2474                                 $noargs = true;
2475                         }
2476                 }
2477
2478                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2479                 $argc = count( $args );
2480
2481                 # SUBST
2482                 if ( !$found ) {
2483                         $mwSubst =& MagicWord::get( MAG_SUBST );
2484                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
2485                                 # One of two possibilities is true:
2486                                 # 1) Found SUBST but not in the PST phase
2487                                 # 2) Didn't find SUBST and in the PST phase
2488                                 # In either case, return without further processing
2489                                 $text = $piece['text'];
2490                                 $found = true;
2491                                 $noparse = true;
2492                                 $noargs = true;
2493                         }
2494                 }
2495
2496                 # MSG, MSGNW, INT and RAW
2497                 if ( !$found ) {
2498                         # Check for MSGNW:
2499                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
2500                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2501                                 $nowiki = true;
2502                         } else {
2503                                 # Remove obsolete MSG:
2504                                 $mwMsg =& MagicWord::get( MAG_MSG );
2505                                 $mwMsg->matchStartAndRemove( $part1 );
2506                         }
2507
2508                         # Check for RAW:
2509                         $mwRaw =& MagicWord::get( MAG_RAW );
2510                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2511                                 $forceRawInterwiki = true;
2512                         }
2513
2514                         # Check if it is an internal message
2515                         $mwInt =& MagicWord::get( MAG_INT );
2516                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
2517                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
2518                                         $text = $linestart . wfMsgReal( $part1, $args, true );
2519                                         $found = true;
2520                                 }
2521                         }
2522                 }
2523
2524                 # NS
2525                 if ( !$found ) {
2526                         # Check for NS: (namespace expansion)
2527                         $mwNs = MagicWord::get( MAG_NS );
2528                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
2529                                 if ( intval( $part1 ) || $part1 == "0" ) {
2530                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
2531                                         $found = true;
2532                                 } else {
2533                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
2534                                         if ( !is_null( $index ) ) {
2535                                                 $text = $linestart . $wgContLang->getNsText( $index );
2536                                                 $found = true;
2537                                         }
2538                                 }
2539                         }
2540                 }
2541
2542                 # LCFIRST, UCFIRST, LC and UC
2543                 if ( !$found ) {
2544                         $lcfirst =& MagicWord::get( MAG_LCFIRST );
2545                         $ucfirst =& MagicWord::get( MAG_UCFIRST );
2546                         $lc =& MagicWord::get( MAG_LC );
2547                         $uc =& MagicWord::get( MAG_UC );
2548                         if ( $lcfirst->matchStartAndRemove( $part1 ) ) {
2549                                 $text = $linestart . $wgContLang->lcfirst( $part1 );
2550                                 $found = true;
2551                         } else if ( $ucfirst->matchStartAndRemove( $part1 ) ) {
2552                                 $text = $linestart . $wgContLang->ucfirst( $part1 );
2553                                 $found = true;
2554                         } else if ( $lc->matchStartAndRemove( $part1 ) ) {
2555                                 $text = $linestart . $wgContLang->lc( $part1 );
2556                                 $found = true;
2557                         } else if ( $uc->matchStartAndRemove( $part1 ) ) {
2558                                  $text = $linestart . $wgContLang->uc( $part1 );
2559                                  $found = true;
2560                         }
2561                 }
2562
2563                 # LOCALURL and FULLURL
2564                 if ( !$found ) {
2565                         $mwLocal =& MagicWord::get( MAG_LOCALURL );
2566                         $mwLocalE =& MagicWord::get( MAG_LOCALURLE );
2567                         $mwFull =& MagicWord::get( MAG_FULLURL );
2568                         $mwFullE =& MagicWord::get( MAG_FULLURLE );
2569
2570
2571                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2572                                 $func = 'getLocalURL';
2573                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2574                                 $func = 'escapeLocalURL';
2575                         } elseif ( $mwFull->matchStartAndRemove( $part1 ) ) {
2576                                 $func = 'getFullURL';
2577                         } elseif ( $mwFullE->matchStartAndRemove( $part1 ) ) {
2578                                 $func = 'escapeFullURL';
2579                         } else {
2580                                 $func = false;
2581                         }
2582
2583                         if ( $func !== false ) {
2584                                 $title = Title::newFromText( $part1 );
2585                                 if ( !is_null( $title ) ) {
2586                                         if ( $argc > 0 ) {
2587                                                 $text = $linestart . $title->$func( $args[0] );
2588                                         } else {
2589                                                 $text = $linestart . $title->$func();
2590                                         }
2591                                         $found = true;
2592                                 }
2593                         }
2594                 }
2595
2596                 # GRAMMAR
2597                 if ( !$found && $argc == 1 ) {
2598                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2599                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2600                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2601                                 $found = true;
2602                         }
2603                 }
2604
2605                 # PLURAL
2606                 if ( !$found && $argc >= 2 ) {
2607                         $mwPluralForm =& MagicWord::get( MAG_PLURAL );
2608                         if ( $mwPluralForm->matchStartAndRemove( $part1 ) ) {
2609                                 if ($argc==2) {$args[2]=$args[1];}
2610                                 $text = $linestart . $wgContLang->convertPlural( $part1, $args[0], $args[1], $args[2]);
2611                                 $found = true;
2612                         }
2613                 }
2614
2615                 # DISPLAYTITLE
2616                 if ( !$found && $argc == 1 && $wgAllowDisplayTitle ) {
2617                         global $wgOut;
2618
2619                         # Only the first one counts...
2620                         if ( $wgOut->mPageLinkTitle == "" ) {
2621                                 $param = $args[0];
2622                                 $parserOptions = new ParserOptions;
2623                                 $local_parser = new Parser ();
2624                                 $t2 = $local_parser->parse ( $param, $this->mTitle, $parserOptions, false );
2625                                 $wgOut->mPageLinkTitle = $wgOut->getPageTitle();
2626                                 $wgOut->mPagetitle = $t2->GetText();
2627
2628                                 # Add subtitle
2629                                 $t = $this->mTitle->getPrefixedText();
2630                                 $st = trim ( $wgOut->getSubtitle () );
2631                                 if ( $st != "" ) $st .= " ";
2632                                 $st .= str_replace ( "$1", $t, wfMsg('displaytitle') );
2633                                 $wgOut->setSubtitle ( $st );
2634                         }
2635                         $text = "" ;
2636                         $found = true ;
2637                 }
2638
2639                 # Extensions
2640                 if ( !$found && substr( $part1, 0, 1 ) == '#' ) {
2641                         $colonPos = strpos( $part1, ':' );
2642                         if ( $colonPos !== false ) {
2643                                 $function = strtolower( substr( $part1, 1, $colonPos - 1 ) );
2644                                 if ( isset( $this->mFunctionHooks[$function] ) ) {
2645                                         $funcArgs = array_merge( array( &$this, substr( $part1, $colonPos + 1 ) ), $args );
2646                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2647                                         $found = true;
2648                                         if ( is_array( $result ) ) {
2649                                                 $text = $linestart . $result[0];
2650                                                 unset( $result[0] );
2651
2652                                                 // Extract flags into the local scope
2653                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2654                                                 extract( $result );
2655                                         } else {
2656                                                 $text = $linestart . $result;
2657                                         }
2658                                 }
2659                         }
2660                 }
2661
2662                 # Template table test
2663
2664                 # Did we encounter this template already? If yes, it is in the cache
2665                 # and we need to check for loops.
2666                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2667                         $found = true;
2668
2669                         # Infinite loop test
2670                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2671                                 $noparse = true;
2672                                 $noargs = true;
2673                                 $found = true;
2674                                 $text = $linestart .
2675                                         '{{' . $part1 . '}}' .
2676                                         '<!-- WARNING: template loop detected -->';
2677                                 wfDebug( "$fname: template loop broken at '$part1'\n" );
2678                         } else {
2679                                 # set $text to cached message.
2680                                 $text = $linestart . $this->mTemplates[$piece['title']];
2681                         }
2682                 }
2683
2684                 # Load from database
2685                 $lastPathLevel = $this->mTemplatePath;
2686                 if ( !$found ) {
2687                         $ns = NS_TEMPLATE;
2688                         # declaring $subpage directly in the function call
2689                         # does not work correctly with references and breaks
2690                         # {{/subpage}}-style inclusions
2691                         $subpage = '';
2692                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2693                         if ($subpage !== '') {
2694                                 $ns = $this->mTitle->getNamespace();
2695                         }
2696                         $title = Title::newFromText( $part1, $ns );
2697
2698                         if ( !is_null( $title ) ) {
2699                                 if ( !$title->isExternal() ) {
2700                                         # Check for excessive inclusion
2701                                         $dbk = $title->getPrefixedDBkey();
2702                                         if ( $this->incrementIncludeCount( $dbk ) ) {
2703                                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() ) {
2704                                                         # Capture special page output
2705                                                         $text = SpecialPage::capturePath( $title );
2706                                                         if ( is_string( $text ) ) {
2707                                                                 $found = true;
2708                                                                 $noparse = true;
2709                                                                 $noargs = true;
2710                                                                 $isHTML = true;
2711                                                                 $this->disableCache();
2712                                                         }
2713                                                 } else {
2714                                                         $articleContent = $this->fetchTemplate( $title );
2715                                                         if ( $articleContent !== false ) {
2716                                                                 $found = true;
2717                                                                 $text = $articleContent;
2718                                                                 $replaceHeadings = true;
2719                                                         }
2720                                                 }
2721                                         }
2722
2723                                         # If the title is valid but undisplayable, make a link to it
2724                                         if ( $this->mOutputType == OT_HTML && !$found ) {
2725                                                 $text = '[['.$title->getPrefixedText().']]';
2726                                                 $found = true;
2727                                         }
2728                                 } elseif ( $title->isTrans() ) {
2729                                         // Interwiki transclusion
2730                                         if ( $this->mOutputType == OT_HTML && !$forceRawInterwiki ) {
2731                                                 $text = $this->interwikiTransclude( $title, 'render' );
2732                                                 $isHTML = true;
2733                                                 $noparse = true;
2734                                         } else {
2735                                                 $text = $this->interwikiTransclude( $title, 'raw' );
2736                                                 $replaceHeadings = true;
2737                                         }
2738                                         $found = true;
2739                                 }
2740
2741                                 # Template cache array insertion
2742                                 # Use the original $piece['title'] not the mangled $part1, so that
2743                                 # modifiers such as RAW: produce separate cache entries
2744                                 if( $found ) {
2745                                         $this->mTemplates[$piece['title']] = $text;
2746                                         $text = $linestart . $text;
2747                                 }
2748                         }
2749                 }
2750
2751                 # Recursive parsing, escaping and link table handling
2752                 # Only for HTML output
2753                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2754                         $text = wfEscapeWikiText( $text );
2755                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found ) {
2756                         if ( !$noargs ) {
2757                                 # Clean up argument array
2758                                 $assocArgs = array();
2759                                 $index = 1;
2760                                 foreach( $args as $arg ) {
2761                                         $eqpos = strpos( $arg, '=' );
2762                                         if ( $eqpos === false ) {
2763                                                 $assocArgs[$index++] = $arg;
2764                                         } else {
2765                                                 $name = trim( substr( $arg, 0, $eqpos ) );
2766                                                 $value = trim( substr( $arg, $eqpos+1 ) );
2767                                                 if ( $value === false ) {
2768                                                         $value = '';
2769                                                 }
2770                                                 if ( $name !== false ) {
2771                                                         $assocArgs[$name] = $value;
2772                                                 }
2773                                         }
2774                                 }
2775
2776                                 # Add a new element to the templace recursion path
2777                                 $this->mTemplatePath[$part1] = 1;
2778                         }
2779
2780                         if ( !$noparse ) {
2781                                 # If there are any <onlyinclude> tags, only include them
2782                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
2783                                         preg_match_all( '/<onlyinclude>(.*?)\n?<\/onlyinclude>/s', $text, $m );
2784                                         $text = '';
2785                                         foreach ($m[1] as $piece)
2786                                                 $text .= $piece;
2787                                 }
2788                                 # Remove <noinclude> sections and <includeonly> tags
2789                                 $text = preg_replace( '/<noinclude>.*?<\/noinclude>/s', '', $text );
2790                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
2791
2792                                 if( $this->mOutputType == OT_HTML ) {
2793                                         # Strip <nowiki>, <pre>, etc.
2794                                         $text = $this->strip( $text, $this->mStripState );
2795                                         $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
2796                                 }
2797                                 $text = $this->replaceVariables( $text, $assocArgs );
2798
2799                                 # If the template begins with a table or block-level
2800                                 # element, it should be treated as beginning a new line.
2801                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2802                                         $text = "\n" . $text;
2803                                 }
2804                         } elseif ( !$noargs ) {
2805                                 # $noparse and !$noargs
2806                                 # Just replace the arguments, not any double-brace items
2807                                 # This is used for rendered interwiki transclusion
2808                                 $text = $this->replaceVariables( $text, $assocArgs, true );
2809                         }
2810                 }
2811                 # Prune lower levels off the recursion check path
2812                 $this->mTemplatePath = $lastPathLevel;
2813
2814                 if ( !$found ) {
2815                         wfProfileOut( $fname );
2816                         return $piece['text'];
2817                 } else {
2818                         if ( $isHTML ) {
2819                                 # Replace raw HTML by a placeholder
2820                                 # Add a blank line preceding, to prevent it from mucking up
2821                                 # immediately preceding headings
2822                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
2823                         } else {
2824                                 # replace ==section headers==
2825                                 # XXX this needs to go away once we have a better parser.
2826                                 if ( $this->mOutputType != OT_WIKI && $replaceHeadings ) {
2827                                         if( !is_null( $title ) )
2828                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
2829                                         else
2830                                                 $encodedname = base64_encode("");
2831                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2832                                                 PREG_SPLIT_DELIM_CAPTURE);
2833                                         $text = '';
2834                                         $nsec = 0;
2835                                         for( $i = 0; $i < count($m); $i += 2 ) {
2836                                                 $text .= $m[$i];
2837                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2838                                                 $hl = $m[$i + 1];
2839                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2840                                                         $text .= $hl;
2841                                                         continue;
2842                                                 }
2843                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2844                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2845                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2846
2847                                                 $nsec++;
2848                                         }
2849                                 }
2850                         }
2851                 }
2852
2853                 # Prune lower levels off the recursion check path
2854                 $this->mTemplatePath = $lastPathLevel;
2855
2856                 if ( !$found ) {
2857                         wfProfileOut( $fname );
2858                         return $piece['text'];
2859                 } else {
2860                         wfProfileOut( $fname );
2861                         return $text;
2862                 }
2863         }
2864
2865         /**
2866          * Fetch the unparsed text of a template and register a reference to it.
2867          */
2868         function fetchTemplate( $title ) {
2869                 $text = false;
2870                 // Loop to fetch the article, with up to 1 redirect
2871                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
2872                         $rev = Revision::newFromTitle( $title );
2873                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
2874                         if ( !$rev ) {
2875                                 break;
2876                         }
2877                         $text = $rev->getText();
2878                         if ( $text === false ) {
2879                                 break;
2880                         }
2881                         // Redirect?
2882                         $title = Title::newFromRedirect( $text );
2883                 }
2884                 return $text;
2885         }
2886
2887         /**
2888          * Transclude an interwiki link.
2889          */
2890         function interwikiTransclude( $title, $action ) {
2891                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
2892
2893                 if (!$wgEnableScaryTranscluding)
2894                         return wfMsg('scarytranscludedisabled');
2895
2896                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
2897                 // But we'll handle it generally anyway
2898                 if ( $title->getNamespace() ) {
2899                         // Use the canonical namespace, which should work anywhere
2900                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
2901                 } else {
2902                         $articleName = $title->getDBkey();
2903                 }
2904
2905                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
2906                 $url .= "?action=$action";
2907                 if (strlen($url) > 255)
2908                         return wfMsg('scarytranscludetoolong');
2909                 return $this->fetchScaryTemplateMaybeFromCache($url);
2910         }
2911
2912         function fetchScaryTemplateMaybeFromCache($url) {
2913                 global $wgTranscludeCacheExpiry;
2914                 $dbr =& wfGetDB(DB_SLAVE);
2915                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
2916                                 array('tc_url' => $url));
2917                 if ($obj) {
2918                         $time = $obj->tc_time;
2919                         $text = $obj->tc_contents;
2920                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
2921                                 return $text;
2922                         }
2923                 }
2924
2925                 $text = wfGetHTTP($url);
2926                 if (!$text)
2927                         return wfMsg('scarytranscludefailed', $url);
2928
2929                 $dbw =& wfGetDB(DB_MASTER);
2930                 $dbw->replace('transcache', array('tc_url'), array(
2931                         'tc_url' => $url,
2932                         'tc_time' => time(),
2933                         'tc_contents' => $text));
2934                 return $text;
2935         }
2936
2937
2938         /**
2939          * Triple brace replacement -- used for template arguments
2940          * @access private
2941          */
2942         function argSubstitution( $matches ) {
2943                 $arg = trim( $matches['title'] );
2944                 $text = $matches['text'];
2945                 $inputArgs = end( $this->mArgStack );
2946
2947                 if ( array_key_exists( $arg, $inputArgs ) ) {
2948                         $text = $inputArgs[$arg];
2949                 } else if ($this->mOutputType == OT_HTML && null != $matches['parts'] && count($matches['parts']) > 0) {
2950                         $text = $matches['parts'][0];
2951                 }
2952
2953                 return $text;
2954         }
2955
2956         /**
2957          * Returns true if the function is allowed to include this entity
2958          * @access private
2959          */
2960         function incrementIncludeCount( $dbk ) {
2961                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2962                         $this->mIncludeCount[$dbk] = 0;
2963                 }
2964                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2965                         return true;
2966                 } else {
2967                         return false;
2968                 }
2969         }
2970
2971         /**
2972          * This function accomplishes several tasks:
2973          * 1) Auto-number headings if that option is enabled
2974          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2975          * 3) Add a Table of contents on the top for users who have enabled the option
2976          * 4) Auto-anchor headings
2977          *
2978          * It loops through all headlines, collects the necessary data, then splits up the
2979          * string and re-inserts the newly formatted headlines.
2980          *
2981          * @param string $text
2982          * @param boolean $isMain
2983          * @access private
2984          */
2985         function formatHeadings( $text, $isMain=true ) {
2986                 global $wgMaxTocLevel, $wgContLang;
2987
2988                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2989                 $doShowToc = true;
2990                 $forceTocHere = false;
2991                 if( !$this->mTitle->userCanEdit() ) {
2992                         $showEditLink = 0;
2993                 } else {
2994                         $showEditLink = $this->mOptions->getEditSection();
2995                 }
2996
2997                 # Inhibit editsection links if requested in the page
2998                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2999                 if( $esw->matchAndRemove( $text ) ) {
3000                         $showEditLink = 0;
3001                 }
3002                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3003                 # do not add TOC
3004                 $mw =& MagicWord::get( MAG_NOTOC );
3005                 if( $mw->matchAndRemove( $text ) ) {
3006                         $doShowToc = false;
3007                 }
3008
3009                 # Get all headlines for numbering them and adding funky stuff like [edit]
3010                 # links - this is for later, but we need the number of headlines right now
3011                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3012
3013                 # if there are fewer than 4 headlines in the article, do not show TOC
3014                 if( $numMatches < 4 ) {
3015                         $doShowToc = false;
3016                 }
3017
3018                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
3019                 # override above conditions and always show TOC at that place
3020
3021                 $mw =& MagicWord::get( MAG_TOC );
3022                 if($mw->match( $text ) ) {
3023                         $doShowToc = true;
3024                         $forceTocHere = true;
3025                 } else {
3026                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3027                         # override above conditions and always show TOC above first header
3028                         $mw =& MagicWord::get( MAG_FORCETOC );
3029                         if ($mw->matchAndRemove( $text ) ) {
3030                                 $doShowToc = true;
3031                         }
3032                 }
3033
3034                 # Never ever show TOC if no headers
3035                 if( $numMatches < 1 ) {
3036                         $doShowToc = false;
3037                 }
3038
3039                 # We need this to perform operations on the HTML
3040                 $sk =& $this->mOptions->getSkin();
3041
3042                 # headline counter
3043                 $headlineCount = 0;
3044                 $sectionCount = 0; # headlineCount excluding template sections
3045
3046                 # Ugh .. the TOC should have neat indentation levels which can be
3047                 # passed to the skin functions. These are determined here
3048                 $toc = '';
3049                 $full = '';
3050                 $head = array();
3051                 $sublevelCount = array();
3052                 $levelCount = array();
3053                 $toclevel = 0;
3054                 $level = 0;
3055                 $prevlevel = 0;
3056                 $toclevel = 0;
3057                 $prevtoclevel = 0;
3058
3059                 foreach( $matches[3] as $headline ) {
3060                         $istemplate = 0;
3061                         $templatetitle = '';
3062                         $templatesection = 0;
3063                         $numbering = '';
3064
3065                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3066                                 $istemplate = 1;
3067                                 $templatetitle = base64_decode($mat[1]);
3068                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3069                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3070                         }
3071
3072                         if( $toclevel ) {
3073                                 $prevlevel = $level;
3074                                 $prevtoclevel = $toclevel;
3075                         }
3076                         $level = $matches[1][$headlineCount];
3077
3078                         if( $doNumberHeadings || $doShowToc ) {
3079
3080                                 if ( $level > $prevlevel ) {
3081                                         # Increase TOC level
3082                                         $toclevel++;
3083                                         $sublevelCount[$toclevel] = 0;
3084                                         $toc .= $sk->tocIndent();
3085                                 }
3086                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3087                                         # Decrease TOC level, find level to jump to
3088
3089                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3090                                                 # Can only go down to level 1
3091                                                 $toclevel = 1;
3092                                         } else {
3093                                                 for ($i = $toclevel; $i > 0; $i--) {
3094                                                         if ( $levelCount[$i] == $level ) {
3095                                                                 # Found last matching level
3096                                                                 $toclevel = $i;
3097                                                                 break;
3098                                                         }
3099                                                         elseif ( $levelCount[$i] < $level ) {
3100                                                                 # Found first matching level below current level
3101                                                                 $toclevel = $i + 1;
3102                                                                 break;
3103                                                         }
3104                                                 }
3105                                         }
3106
3107                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3108                                 }
3109                                 else {
3110                                         # No change in level, end TOC line
3111                                         $toc .= $sk->tocLineEnd();
3112                                 }
3113
3114                                 $levelCount[$toclevel] = $level;
3115
3116                                 # count number of headlines for each level
3117                                 @$sublevelCount[$toclevel]++;
3118                                 $dot = 0;
3119                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3120                                         if( !empty( $sublevelCount[$i] ) ) {
3121                                                 if( $dot ) {
3122                                                         $numbering .= '.';
3123                                                 }
3124                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3125                                                 $dot = 1;
3126                                         }
3127                                 }
3128                         }
3129
3130                         # The canonized header is a version of the header text safe to use for links
3131                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3132                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
3133                         $canonized_headline = $this->unstripNoWiki( $canonized_headline, $this->mStripState );
3134
3135                         # Remove link placeholders by the link text.
3136                         #     <!--LINK number-->
3137                         # turns into
3138                         #     link text with suffix
3139                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3140                                                             "\$this->mLinkHolders['texts'][\$1]",
3141                                                             $canonized_headline );
3142                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3143                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3144                                                             $canonized_headline );
3145
3146                         # strip out HTML
3147                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3148                         $tocline = trim( $canonized_headline );
3149                         # Save headline for section edit hint before it's escaped
3150                         $headline_hint = trim( $canonized_headline );
3151                         $canonized_headline = Sanitizer::escapeId( $tocline );
3152                         $refers[$headlineCount] = $canonized_headline;
3153
3154                         # count how many in assoc. array so we can track dupes in anchors
3155                         @$refers[$canonized_headline]++;
3156                         $refcount[$headlineCount]=$refers[$canonized_headline];
3157
3158                         # Don't number the heading if it is the only one (looks silly)
3159                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3160                                 # the two are different if the line contains a link
3161                                 $headline=$numbering . ' ' . $headline;
3162                         }
3163
3164                         # Create the anchor for linking from the TOC to the section
3165                         $anchor = $canonized_headline;
3166                         if($refcount[$headlineCount] > 1 ) {
3167                                 $anchor .= '_' . $refcount[$headlineCount];
3168                         }
3169                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3170                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3171                         }
3172                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3173                                 if ( empty( $head[$headlineCount] ) ) {
3174                                         $head[$headlineCount] = '';
3175                                 }
3176                                 if( $istemplate )
3177                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3178                                 else
3179                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3180                         }
3181
3182                         # give headline the correct <h#> tag
3183                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
3184
3185                         $headlineCount++;
3186                         if( !$istemplate )
3187                                 $sectionCount++;
3188                 }
3189
3190                 if( $doShowToc ) {
3191                         $toc .= $sk->tocUnindent( $toclevel - 1 );
3192                         $toc = $sk->tocList( $toc );
3193                 }
3194
3195                 # split up and insert constructed headlines
3196
3197                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3198                 $i = 0;
3199
3200                 foreach( $blocks as $block ) {
3201                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3202                                 # This is the [edit] link that appears for the top block of text when
3203                                 # section editing is enabled
3204
3205                                 # Disabled because it broke block formatting
3206                                 # For example, a bullet point in the top line
3207                                 # $full .= $sk->editSectionLink(0);
3208                         }
3209                         $full .= $block;
3210                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
3211                         # Top anchor now in skin
3212                                 $full = $full.$toc;
3213                         }
3214
3215                         if( !empty( $head[$i] ) ) {
3216                                 $full .= $head[$i];
3217                         }
3218                         $i++;
3219                 }
3220                 if($forceTocHere) {
3221                         $mw =& MagicWord::get( MAG_TOC );
3222                         return $mw->replace( $toc, $full );
3223                 } else {
3224                         return $full;
3225                 }
3226         }
3227
3228         /**
3229          * Return an HTML link for the "ISBN 123456" text
3230          * @access private
3231          */
3232         function magicISBN( $text ) {
3233                 $fname = 'Parser::magicISBN';
3234                 wfProfileIn( $fname );
3235
3236                 $a = split( 'ISBN ', ' '.$text );
3237                 if ( count ( $a ) < 2 ) {
3238                         wfProfileOut( $fname );
3239                         return $text;
3240                 }
3241                 $text = substr( array_shift( $a ), 1);
3242                 $valid = '0123456789-Xx';
3243
3244                 foreach ( $a as $x ) {
3245                         # hack: don't replace inside thumbnail title/alt
3246                         # attributes
3247                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3248                                 $text .= "ISBN $x";
3249                                 continue;
3250                         }
3251
3252                         $isbn = $blank = '' ;
3253                         while ( ' ' == $x{0} ) {
3254                                 $blank .= ' ';
3255                                 $x = substr( $x, 1 );
3256                         }
3257                         if ( $x == '' ) { # blank isbn
3258                                 $text .= "ISBN $blank";
3259                                 continue;
3260                         }
3261                         while ( strstr( $valid, $x{0} ) != false ) {
3262                                 $isbn .= $x{0};
3263                                 $x = substr( $x, 1 );
3264                         }
3265                         $num = str_replace( '-', '', $isbn );
3266                         $num = str_replace( ' ', '', $num );
3267                         $num = str_replace( 'x', 'X', $num );
3268
3269                         if ( '' == $num ) {
3270                                 $text .= "ISBN $blank$x";
3271                         } else {
3272                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
3273                                 $text .= '<a href="' .
3274                                         $titleObj->escapeLocalUrl( 'isbn='.$num ) .
3275                                         "\" class=\"internal\">ISBN $isbn</a>";
3276                                 $text .= $x;
3277                         }
3278                 }
3279                 wfProfileOut( $fname );
3280                 return $text;
3281         }
3282
3283         /**
3284          * Return an HTML link for the "RFC 1234" text
3285          *
3286          * @access private
3287          * @param string $text     Text to be processed
3288          * @param string $keyword  Magic keyword to use (default RFC)
3289          * @param string $urlmsg   Interface message to use (default rfcurl)
3290          * @return string
3291          */
3292         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
3293
3294                 $valid = '0123456789';
3295                 $internal = false;
3296
3297                 $a = split( $keyword, ' '.$text );
3298                 if ( count ( $a ) < 2 ) {
3299                         return $text;
3300                 }
3301                 $text = substr( array_shift( $a ), 1);
3302
3303                 /* Check if keyword is preceed by [[.
3304                  * This test is made here cause of the array_shift above
3305                  * that prevent the test to be done in the foreach.
3306                  */
3307                 if ( substr( $text, -2 ) == '[[' ) {
3308                         $internal = true;
3309                 }
3310
3311                 foreach ( $a as $x ) {
3312                         /* token might be empty if we have RFC RFC 1234 */
3313                         if ( $x=='' ) {
3314                                 $text.=$keyword;
3315                                 continue;
3316                                 }
3317
3318                         # hack: don't replace inside thumbnail title/alt
3319                         # attributes
3320                         if(preg_match('/<[^>]+(alt|title)="[^">]*$/', $text)) {
3321                                 $text .= $keyword . $x;
3322                                 continue;
3323                         }
3324
3325                         $id = $blank = '' ;
3326
3327                         /** remove and save whitespaces in $blank */
3328                         while ( $x{0} == ' ' ) {
3329                                 $blank .= ' ';
3330                                 $x = substr( $x, 1 );
3331                         }
3332
3333                         /** remove and save the rfc number in $id */
3334                         while ( strstr( $valid, $x{0} ) != false ) {
3335                                 $id .= $x{0};
3336                                 $x = substr( $x, 1 );
3337                         }
3338
3339                         if ( $id == '' ) {
3340                                 /* call back stripped spaces*/
3341                                 $text .= $keyword.$blank.$x;
3342                         } elseif( $internal ) {
3343                                 /* normal link */
3344                                 $text .= $keyword.$id.$x;
3345                         } else {
3346                                 /* build the external link*/
3347                                 $url = wfMsg( $urlmsg, $id);
3348                                 $sk =& $this->mOptions->getSkin();
3349                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
3350                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
3351                         }
3352
3353                         /* Check if the next RFC keyword is preceed by [[ */
3354                         $internal = ( substr($x,-2) == '[[' );
3355                 }
3356                 return $text;
3357         }
3358
3359         /**
3360          * Transform wiki markup when saving a page by doing \r\n -> \n
3361          * conversion, substitting signatures, {{subst:}} templates, etc.
3362          *
3363          * @param string $text the text to transform
3364          * @param Title &$title the Title object for the current article
3365          * @param User &$user the User object describing the current user
3366          * @param ParserOptions $options parsing options
3367          * @param bool $clearState whether to clear the parser state first
3368          * @return string the altered wiki markup
3369          * @access public
3370          */
3371         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
3372                 $this->mOptions = $options;
3373                 $this->mTitle =& $title;
3374                 $this->mOutputType = OT_WIKI;
3375
3376                 if ( $clearState ) {
3377                         $this->clearState();
3378                 }
3379
3380                 $stripState = false;
3381                 $pairs = array(
3382                         "\r\n" => "\n",
3383                 );
3384                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3385                 $text = $this->strip( $text, $stripState, true );
3386                 $text = $this->pstPass2( $text, $user );
3387                 $text = $this->unstrip( $text, $stripState );
3388                 $text = $this->unstripNoWiki( $text, $stripState );
3389                 return $text;
3390         }
3391
3392         /**
3393          * Pre-save transform helper function
3394          * @access private
3395          */
3396         function pstPass2( $text, &$user ) {
3397                 global $wgContLang, $wgLocaltimezone;
3398
3399                 /* Note: This is the timestamp saved as hardcoded wikitext to
3400                  * the database, we use $wgContLang here in order to give
3401                  * everyone the same signiture and use the default one rather
3402                  * than the one selected in each users preferences.
3403                  */
3404                 if ( isset( $wgLocaltimezone ) ) {
3405                         $oldtz = getenv( 'TZ' );
3406                         putenv( 'TZ='.$wgLocaltimezone );
3407                 }
3408                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3409                   ' (' . date( 'T' ) . ')';
3410                 if ( isset( $wgLocaltimezone ) ) {
3411                         putenv( 'TZ='.$oldtz );
3412                 }
3413
3414                 # Variable replacement
3415                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3416                 $text = $this->replaceVariables( $text );
3417
3418                 # Signatures
3419                 $sigText = $this->getUserSig( $user );
3420                 $text = strtr( $text, array(
3421                         '~~~~~' => $d,
3422                         '~~~~' => "$sigText $d",
3423                         '~~~' => $sigText
3424                 ) );
3425
3426                 # Context links: [[|name]] and [[name (context)|]]
3427                 #
3428                 global $wgLegalTitleChars;
3429                 $tc = "[$wgLegalTitleChars]";
3430                 $np = str_replace( array( '(', ')' ), array( '', '' ), $tc ); # No parens
3431
3432                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3433                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
3434
3435                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
3436                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
3437                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
3438                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
3439                 $context = '';
3440                 $t = $this->mTitle->getText();
3441                 if ( preg_match( $conpat, $t, $m ) ) {
3442                         $context = $m[2];
3443                 }
3444                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
3445                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
3446                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
3447
3448                 if ( '' == $context ) {
3449                         $text = preg_replace( $p2, '[[\\1]]', $text );
3450                 } else {
3451                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
3452                 }
3453
3454                 # Trim trailing whitespace
3455                 # MAG_END (__END__) tag allows for trailing
3456                 # whitespace to be deliberately included
3457                 $text = rtrim( $text );
3458                 $mw =& MagicWord::get( MAG_END );
3459                 $mw->matchAndRemove( $text );
3460
3461                 return $text;
3462         }
3463
3464         /**
3465          * Fetch the user's signature text, if any, and normalize to
3466          * validated, ready-to-insert wikitext.
3467          *
3468          * @param User $user
3469          * @return string
3470          * @access private
3471          */
3472         function getUserSig( &$user ) {
3473                 $username = $user->getName();
3474                 $nickname = $user->getOption( 'nickname' );
3475                 $nickname = $nickname === '' ? $username : $nickname;
3476
3477                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3478                         # Sig. might contain markup; validate this
3479                         if( $this->validateSig( $nickname ) !== false ) {
3480                                 # Validated; clean up (if needed) and return it
3481                                 return( $this->cleanSig( $nickname ) );
3482                         } else {
3483                                 # Failed to validate; fall back to the default
3484                                 $nickname = $username;
3485                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3486                         }
3487                 }
3488
3489                 # If we're still here, make it a link to the user page
3490                 $userpage = $user->getUserPage();
3491                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3492         }
3493
3494         /**
3495          * Check that the user's signature contains no bad XML
3496          *
3497          * @param string $text
3498          * @return mixed An expanded string, or false if invalid.
3499          */
3500         function validateSig( $text ) {
3501                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3502         }
3503
3504         /**
3505          * Clean up signature text
3506          *
3507          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures
3508          * 2) Substitute all transclusions
3509          *
3510          * @param string $text
3511          * @return string Signature text
3512          */
3513         function cleanSig( $text ) {
3514                 $substWord = MagicWord::get( MAG_SUBST );
3515                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3516                 $substText = '{{' . $substWord->getSynonym( 0 );
3517
3518                 $text = preg_replace( $substRegex, $substText, $text );
3519                 $text = preg_replace( '/~{3,5}/', '', $text );
3520                 $text = $this->replaceVariables( $text );
3521
3522                 return $text;
3523         }
3524
3525         /**
3526          * Set up some variables which are usually set up in parse()
3527          * so that an external function can call some class members with confidence
3528          * @access public
3529          */
3530         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3531                 $this->mTitle =& $title;
3532                 $this->mOptions = $options;
3533                 $this->mOutputType = $outputType;
3534                 if ( $clearState ) {
3535                         $this->clearState();
3536                 }
3537         }
3538
3539         /**
3540          * Transform a MediaWiki message by replacing magic variables.
3541          *
3542          * @param string $text the text to transform
3543          * @param ParserOptions $options  options
3544          * @return string the text with variables substituted
3545          * @access public
3546          */
3547         function transformMsg( $text, $options ) {
3548                 global $wgTitle;
3549                 static $executing = false;
3550
3551                 $fname = "Parser::transformMsg";
3552
3553                 # Guard against infinite recursion
3554                 if ( $executing ) {
3555                         return $text;
3556                 }
3557                 $executing = true;
3558
3559                 wfProfileIn($fname);
3560
3561                 $this->mTitle = $wgTitle;
3562                 $this->mOptions = $options;
3563                 $this->mOutputType = OT_MSG;
3564                 $this->clearState();
3565                 $text = $this->replaceVariables( $text );
3566
3567                 $executing = false;
3568                 wfProfileOut($fname);
3569                 return $text;
3570         }
3571
3572         /**
3573          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3574          * The callback should have the following form:
3575          *    function myParserHook( $text, $params, &$parser ) { ... }
3576          *
3577          * Transform and return $text. Use $parser for any required context, e.g. use
3578          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3579          *
3580          * @access public
3581          *
3582          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3583          * @param mixed $callback The callback function (and object) to use for the tag
3584          *
3585          * @return The old value of the mTagHooks array associated with the hook
3586          */
3587         function setHook( $tag, $callback ) {
3588                 $oldVal = @$this->mTagHooks[$tag];
3589                 $this->mTagHooks[$tag] = $callback;
3590
3591                 return $oldVal;
3592         }
3593
3594         /**
3595          * Create a function, e.g. {{sum:1|2|3}}
3596          * The callback function should have the form:
3597          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3598          *
3599          * The callback may either return the text result of the function, or an array with the text
3600          * in element 0, and a number of flags in the other elements. The names of the flags are
3601          * specified in the keys. Valid flags are:
3602          *   found                     The text returned is valid, stop processing the template. This
3603          *                             is on by default.
3604          *   nowiki                    Wiki markup in the return value should be escaped
3605          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3606          *   noargs                    Don't replace triple-brace arguments in the return value
3607          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3608          *
3609          * @access public
3610          *
3611          * @param string $name The function name. Function names are case-insensitive.
3612          * @param mixed $callback The callback function (and object) to use
3613          *
3614          * @return The old callback function for this name, if any
3615          */
3616         function setFunctionHook( $name, $callback ) {
3617                 $name = strtolower( $name );
3618                 $oldVal = @$this->mFunctionHooks[$name];
3619                 $this->mFunctionHooks[$name] = $callback;
3620                 return $oldVal;
3621         }
3622
3623         /**
3624          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3625          * Placeholders created in Skin::makeLinkObj()
3626          * Returns an array of links found, indexed by PDBK:
3627          *  0 - broken
3628          *  1 - normal link
3629          *  2 - stub
3630          * $options is a bit field, RLH_FOR_UPDATE to select for update
3631          */
3632         function replaceLinkHolders( &$text, $options = 0 ) {
3633                 global $wgUser;
3634                 global $wgOutputReplace;
3635
3636                 $fname = 'Parser::replaceLinkHolders';
3637                 wfProfileIn( $fname );
3638
3639                 $pdbks = array();
3640                 $colours = array();
3641                 $sk =& $this->mOptions->getSkin();
3642                 $linkCache =& LinkCache::singleton();
3643
3644                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3645                         wfProfileIn( $fname.'-check' );
3646                         $dbr =& wfGetDB( DB_SLAVE );
3647                         $page = $dbr->tableName( 'page' );
3648                         $threshold = $wgUser->getOption('stubthreshold');
3649
3650                         # Sort by namespace
3651                         asort( $this->mLinkHolders['namespaces'] );
3652
3653                         # Generate query
3654                         $query = false;
3655                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3656                                 # Make title object
3657                                 $title = $this->mLinkHolders['titles'][$key];
3658
3659                                 # Skip invalid entries.
3660                                 # Result will be ugly, but prevents crash.
3661                                 if ( is_null( $title ) ) {
3662                                         continue;
3663                                 }
3664                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3665
3666                                 # Check if it's a static known link, e.g. interwiki
3667                                 if ( $title->isAlwaysKnown() ) {
3668                                         $colours[$pdbk] = 1;
3669                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3670                                         $colours[$pdbk] = 1;
3671                                         $this->mOutput->addLink( $title, $id );
3672                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3673                                         $colours[$pdbk] = 0;
3674                                 } else {
3675                                         # Not in the link cache, add it to the query
3676                                         if ( !isset( $current ) ) {
3677                                                 $current = $ns;
3678                                                 $query =  "SELECT page_id, page_namespace, page_title";
3679                                                 if ( $threshold > 0 ) {
3680                                                         $query .= ', page_len, page_is_redirect';
3681                                                 }
3682                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3683                                         } elseif ( $current != $ns ) {
3684                                                 $current = $ns;
3685                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3686                                         } else {
3687                                                 $query .= ', ';
3688                                         }
3689
3690                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3691                                 }
3692                         }
3693                         if ( $query ) {
3694                                 $query .= '))';
3695                                 if ( $options & RLH_FOR_UPDATE ) {
3696                                         $query .= ' FOR UPDATE';
3697                                 }
3698
3699                                 $res = $dbr->query( $query, $fname );
3700
3701                                 # Fetch data and form into an associative array
3702                                 # non-existent = broken
3703                                 # 1 = known
3704                                 # 2 = stub
3705                                 while ( $s = $dbr->fetchObject($res) ) {
3706                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3707                                         $pdbk = $title->getPrefixedDBkey();
3708                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3709                                         $this->mOutput->addLink( $title, $s->page_id );
3710
3711                                         if ( $threshold >  0 ) {
3712                                                 $size = $s->page_len;
3713                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3714                                                         $colours[$pdbk] = 1;
3715                                                 } else {
3716                                                         $colours[$pdbk] = 2;
3717                                                 }
3718                                         } else {
3719                                                 $colours[$pdbk] = 1;
3720                                         }
3721                                 }
3722                         }
3723                         wfProfileOut( $fname.'-check' );
3724
3725                         # Construct search and replace arrays
3726                         wfProfileIn( $fname.'-construct' );
3727                         $wgOutputReplace = array();
3728                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3729                                 $pdbk = $pdbks[$key];
3730                                 $searchkey = "<!--LINK $key-->";
3731                                 $title = $this->mLinkHolders['titles'][$key];
3732                                 if ( empty( $colours[$pdbk] ) ) {
3733                                         $linkCache->addBadLinkObj( $title );
3734                                         $colours[$pdbk] = 0;
3735                                         $this->mOutput->addLink( $title, 0 );
3736                                         $wgOutputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3737                                                                         $this->mLinkHolders['texts'][$key],
3738                                                                         $this->mLinkHolders['queries'][$key] );
3739                                 } elseif ( $colours[$pdbk] == 1 ) {
3740                                         $wgOutputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3741                                                                         $this->mLinkHolders['texts'][$key],
3742                                                                         $this->mLinkHolders['queries'][$key] );
3743                                 } elseif ( $colours[$pdbk] == 2 ) {
3744                                         $wgOutputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3745                                                                         $this->mLinkHolders['texts'][$key],
3746                                                                         $this->mLinkHolders['queries'][$key] );
3747                                 }
3748                         }
3749                         wfProfileOut( $fname.'-construct' );
3750
3751                         # Do the thing
3752                         wfProfileIn( $fname.'-replace' );
3753
3754                         $text = preg_replace_callback(
3755                                 '/(<!--LINK .*?-->)/',
3756                                 "wfOutputReplaceMatches",
3757                                 $text);
3758
3759                         wfProfileOut( $fname.'-replace' );
3760                 }
3761
3762                 # Now process interwiki link holders
3763                 # This is quite a bit simpler than internal links
3764                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
3765                         wfProfileIn( $fname.'-interwiki' );
3766                         # Make interwiki link HTML
3767                         $wgOutputReplace = array();
3768                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
3769                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
3770                                 $wgOutputReplace[$key] = $sk->makeLinkObj( $title, $link );
3771                         }
3772
3773                         $text = preg_replace_callback(
3774                                 '/<!--IWLINK (.*?)-->/',
3775                                 "wfOutputReplaceMatches",
3776                                 $text );
3777                         wfProfileOut( $fname.'-interwiki' );
3778                 }
3779
3780                 wfProfileOut( $fname );
3781                 return $colours;
3782         }
3783
3784         /**
3785          * Replace <!--LINK--> link placeholders with plain text of links
3786          * (not HTML-formatted).
3787          * @param string $text
3788          * @return string
3789          */
3790         function replaceLinkHoldersText( $text ) {
3791                 $fname = 'Parser::replaceLinkHoldersText';
3792                 wfProfileIn( $fname );
3793
3794                 $text = preg_replace_callback(
3795                         '/<!--(LINK|IWLINK) (.*?)-->/',
3796                         array( &$this, 'replaceLinkHoldersTextCallback' ),
3797                         $text );
3798
3799                 wfProfileOut( $fname );
3800                 return $text;
3801         }
3802
3803         /**
3804          * @param array $matches
3805          * @return string
3806          * @access private
3807          */
3808         function replaceLinkHoldersTextCallback( $matches ) {
3809                 $type = $matches[1];
3810                 $key  = $matches[2];
3811                 if( $type == 'LINK' ) {
3812                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
3813                                 return $this->mLinkHolders['texts'][$key];
3814                         }
3815                 } elseif( $type == 'IWLINK' ) {
3816                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
3817                                 return $this->mInterwikiLinkHolders['texts'][$key];
3818                         }
3819                 }
3820                 return $matches[0];
3821         }
3822
3823         /**
3824          * Renders an image gallery from a text with one line per image.
3825          * text labels may be given by using |-style alternative text. E.g.
3826          *   Image:one.jpg|The number "1"
3827          *   Image:tree.jpg|A tree
3828          * given as text will return the HTML of a gallery with two images,
3829          * labeled 'The number "1"' and
3830          * 'A tree'.
3831          */
3832         function renderImageGallery( $text ) {
3833                 # Setup the parser
3834                 $parserOptions = new ParserOptions;
3835                 $localParser = new Parser();
3836
3837                 $ig = new ImageGallery();
3838                 $ig->setShowBytes( false );
3839                 $ig->setShowFilename( false );
3840                 $lines = explode( "\n", $text );
3841
3842                 foreach ( $lines as $line ) {
3843                         # match lines like these:
3844                         # Image:someimage.jpg|This is some image
3845                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3846                         # Skip empty lines
3847                         if ( count( $matches ) == 0 ) {
3848                                 continue;
3849                         }
3850                         $nt =& Title::newFromText( $matches[1] );
3851                         if( is_null( $nt ) ) {
3852                                 # Bogus title. Ignore these so we don't bomb out later.
3853                                 continue;
3854                         }
3855                         if ( isset( $matches[3] ) ) {
3856                                 $label = $matches[3];
3857                         } else {
3858                                 $label = '';
3859                         }
3860
3861                         $pout = $localParser->parse( $label , $this->mTitle, $parserOptions );
3862                         $html = $pout->getText();
3863
3864                         $ig->add( new Image( $nt ), $html );
3865                         $this->mOutput->addImage( $nt->getDBkey() );
3866                 }
3867                 return $ig->toHTML();
3868         }
3869
3870         /**
3871          * Parse image options text and use it to make an image
3872          */
3873         function makeImage( &$nt, $options ) {
3874                 global $wgUseImageResize;
3875
3876                 $align = '';
3877
3878                 # Check if the options text is of the form "options|alt text"
3879                 # Options are:
3880                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
3881                 #  * left               no resizing, just left align. label is used for alt= only
3882                 #  * right              same, but right aligned
3883                 #  * none               same, but not aligned
3884                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
3885                 #  * center             center the image
3886                 #  * framed             Keep original image size, no magnify-button.
3887
3888                 $part = explode( '|', $options);
3889
3890                 $mwThumb  =& MagicWord::get( MAG_IMG_THUMBNAIL );
3891                 $mwManualThumb =& MagicWord::get( MAG_IMG_MANUALTHUMB );
3892                 $mwLeft   =& MagicWord::get( MAG_IMG_LEFT );
3893                 $mwRight  =& MagicWord::get( MAG_IMG_RIGHT );
3894                 $mwNone   =& MagicWord::get( MAG_IMG_NONE );
3895                 $mwWidth  =& MagicWord::get( MAG_IMG_WIDTH );
3896                 $mwCenter =& MagicWord::get( MAG_IMG_CENTER );
3897                 $mwFramed =& MagicWord::get( MAG_IMG_FRAMED );
3898                 $caption = '';
3899
3900                 $width = $height = $framed = $thumb = false;
3901                 $manual_thumb = '' ;
3902
3903                 foreach( $part as $key => $val ) {
3904                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
3905                                 $thumb=true;
3906                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
3907                                 # use manually specified thumbnail
3908                                 $thumb=true;
3909                                 $manual_thumb = $match;
3910                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
3911                                 # remember to set an alignment, don't render immediately
3912                                 $align = 'right';
3913                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
3914                                 # remember to set an alignment, don't render immediately
3915                                 $align = 'left';
3916                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
3917                                 # remember to set an alignment, don't render immediately
3918                                 $align = 'center';
3919                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
3920                                 # remember to set an alignment, don't render immediately
3921                                 $align = 'none';
3922                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
3923                                 wfDebug( "MAG_IMG_WIDTH match: $match\n" );
3924                                 # $match is the image width in pixels
3925                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
3926                                         $width = intval( $m[1] );
3927                                         $height = intval( $m[2] );
3928                                 } else {
3929                                         $width = intval($match);
3930                                 }
3931                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
3932                                 $framed=true;
3933                         } else {
3934                                 $caption = $val;
3935                         }
3936                 }
3937                 # Strip bad stuff out of the alt text
3938                 $alt = $this->replaceLinkHoldersText( $caption );
3939
3940                 # make sure there are no placeholders in thumbnail attributes
3941                 # that are later expanded to html- so expand them now and
3942                 # remove the tags
3943                 $alt = $this->unstrip($alt, $this->mStripState);
3944                 $alt = Sanitizer::stripAllTags( $alt );
3945
3946                 # Linker does the rest
3947                 $sk =& $this->mOptions->getSkin();
3948                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb );
3949         }
3950
3951         /**
3952          * Set a flag in the output object indicating that the content is dynamic and
3953          * shouldn't be cached.
3954          */
3955         function disableCache() {
3956                 $this->mOutput->mCacheTime = -1;
3957         }
3958
3959         /**#@+
3960          * Callback from the Sanitizer for expanding items found in HTML attribute
3961          * values, so they can be safely tested and escaped.
3962          * @param string $text
3963          * @param array $args
3964          * @return string
3965          * @access private
3966          */
3967         function attributeStripCallback( &$text, $args ) {
3968                 $text = $this->replaceVariables( $text, $args );
3969                 $text = $this->unstripForHTML( $text );
3970                 return $text;
3971         }
3972
3973         function unstripForHTML( $text ) {
3974                 $text = $this->unstrip( $text, $this->mStripState );
3975                 $text = $this->unstripNoWiki( $text, $this->mStripState );
3976                 return $text;
3977         }
3978         /**#@-*/
3979
3980         /**#@+
3981          * Accessor/mutator
3982          */
3983         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
3984         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
3985         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
3986         /**#@-*/
3987
3988         /**#@+
3989          * Accessor
3990          */
3991         function getTags() { return array_keys( $this->mTagHooks ); }
3992         /**#@-*/
3993 }
3994
3995 /**
3996  * @todo document
3997  * @package MediaWiki
3998  */
3999 class ParserOutput
4000 {
4001         var $mText,             # The output text
4002                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4003                 $mCategories,       # Map of category names to sort keys
4004                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4005                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4006                 $mVersion,          # Compatibility check
4007                 $mTitleText,        # title text of the chosen language variant
4008                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4009                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4010                 $mImages,           # DB keys of the images used, in the array key only
4011                 $mExternalLinks;    # External link URLs, in the key only
4012
4013         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4014                 $containsOldMagic = false, $titletext = '' )
4015         {
4016                 $this->mText = $text;
4017                 $this->mLanguageLinks = $languageLinks;
4018                 $this->mCategories = $categoryLinks;
4019                 $this->mContainsOldMagic = $containsOldMagic;
4020                 $this->mCacheTime = '';
4021                 $this->mVersion = MW_PARSER_VERSION;
4022                 $this->mTitleText = $titletext;
4023                 $this->mLinks = array();
4024                 $this->mTemplates = array();
4025                 $this->mImages = array();
4026                 $this->mExternalLinks = array();
4027         }
4028
4029         function getText()                   { return $this->mText; }
4030         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4031         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4032         function &getCategories()            { return $this->mCategories; }
4033         function getCacheTime()              { return $this->mCacheTime; }
4034         function getTitleText()              { return $this->mTitleText; }
4035         function &getLinks()                 { return $this->mLinks; }
4036         function &getTemplates()             { return $this->mTemplates; }
4037         function &getImages()                { return $this->mImages; }
4038         function &getExternalLinks()         { return $this->mExternalLinks; }
4039
4040         function containsOldMagic()          { return $this->mContainsOldMagic; }
4041         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4042         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4043         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4044         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4045         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4046         function setTitleText( $t )          { return wfSetVar ($this->mTitleText, $t); }
4047
4048         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4049         function addImage( $name )           { $this->mImages[$name] = 1; }
4050         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4051         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4052
4053         function addLink( $title, $id ) {
4054                 $ns = $title->getNamespace();
4055                 $dbk = $title->getDBkey();
4056                 if ( !isset( $this->mLinks[$ns] ) ) {
4057                         $this->mLinks[$ns] = array();
4058                 }
4059                 $this->mLinks[$ns][$dbk] = $id;
4060         }
4061
4062         function addTemplate( $title, $id ) {
4063                 $ns = $title->getNamespace();
4064                 $dbk = $title->getDBkey();
4065                 if ( !isset( $this->mTemplates[$ns] ) ) {
4066                         $this->mTemplates[$ns] = array();
4067                 }
4068                 $this->mTemplates[$ns][$dbk] = $id;
4069         }
4070
4071         /**
4072          * Return true if this cached output object predates the global or
4073          * per-article cache invalidation timestamps, or if it comes from
4074          * an incompatible older version.
4075          *
4076          * @param string $touched the affected article's last touched timestamp
4077          * @return bool
4078          * @access public
4079          */
4080         function expired( $touched ) {
4081                 global $wgCacheEpoch;
4082                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4083                        $this->getCacheTime() < $touched ||
4084                        $this->getCacheTime() <= $wgCacheEpoch ||
4085                        !isset( $this->mVersion ) ||
4086                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4087         }
4088 }
4089
4090 /**
4091  * Set options of the Parser
4092  * @todo document
4093  * @package MediaWiki
4094  */
4095 class ParserOptions
4096 {
4097         # All variables are private
4098         var $mUseTeX;                    # Use texvc to expand <math> tags
4099         var $mUseDynamicDates;           # Use DateFormatter to format dates
4100         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
4101         var $mAllowExternalImages;       # Allow external images inline
4102         var $mAllowExternalImagesFrom;   # If not, any exception?
4103         var $mSkin;                      # Reference to the preferred skin
4104         var $mDateFormat;                # Date format index
4105         var $mEditSection;               # Create "edit section" links
4106         var $mNumberHeadings;            # Automatically number headings
4107         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
4108         var $mTidy;                      # Ask for tidy cleanup
4109
4110         function getUseTeX()                        { return $this->mUseTeX; }
4111         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4112         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4113         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4114         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4115         function &getSkin()                         { return $this->mSkin; }
4116         function getDateFormat()                    { return $this->mDateFormat; }
4117         function getEditSection()                   { return $this->mEditSection; }
4118         function getNumberHeadings()                { return $this->mNumberHeadings; }
4119         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4120         function getTidy()                          { return $this->mTidy; }
4121
4122         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4123         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4124         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4125         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4126         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4127         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4128         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4129         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4130         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4131         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4132         function setSkin( &$x ) { $this->mSkin =& $x; }
4133
4134         function ParserOptions() {
4135                 global $wgUser;
4136                 $this->initialiseFromUser( $wgUser );
4137         }
4138
4139         /**
4140          * Get parser options
4141          * @static
4142          */
4143         function newFromUser( &$user ) {
4144                 $popts = new ParserOptions;
4145                 $popts->initialiseFromUser( $user );
4146                 return $popts;
4147         }
4148
4149         /** Get user options */
4150         function initialiseFromUser( &$userInput ) {
4151                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4152                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion;
4153                 $fname = 'ParserOptions::initialiseFromUser';
4154                 wfProfileIn( $fname );
4155                 if ( !$userInput ) {
4156                         $user = new User;
4157                         $user->setLoaded( true );
4158                 } else {
4159                         $user =& $userInput;
4160                 }
4161
4162                 $this->mUseTeX = $wgUseTeX;
4163                 $this->mUseDynamicDates = $wgUseDynamicDates;
4164                 $this->mInterwikiMagic = $wgInterwikiMagic;
4165                 $this->mAllowExternalImages = $wgAllowExternalImages;
4166                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4167                 wfProfileIn( $fname.'-skin' );
4168                 $this->mSkin =& $user->getSkin();
4169                 wfProfileOut( $fname.'-skin' );
4170                 $this->mDateFormat = $user->getOption( 'date' );
4171                 $this->mEditSection = true;
4172                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4173                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4174                 $this->mTidy = false;
4175                 wfProfileOut( $fname );
4176         }
4177 }
4178
4179 /**
4180  * Callback function used by Parser::replaceLinkHolders()
4181  * to substitute link placeholders.
4182  */
4183 function &wfOutputReplaceMatches( $matches ) {
4184         global $wgOutputReplace;
4185         return $wgOutputReplace[$matches[1]];
4186 }
4187
4188 /**
4189  * Return the total number of articles
4190  */
4191 function wfNumberOfArticles() {
4192         global $wgNumberOfArticles;
4193
4194         wfLoadSiteStats();
4195         return $wgNumberOfArticles;
4196 }
4197
4198 /**
4199  * Return the number of files
4200  */
4201 function wfNumberOfFiles() {
4202         $fname = 'wfNumberOfFiles';
4203
4204         wfProfileIn( $fname );
4205         $dbr =& wfGetDB( DB_SLAVE );
4206         $numImages = $dbr->selectField('site_stats', 'ss_images', array(), $fname );
4207         wfProfileOut( $fname );
4208
4209         return $numImages;
4210 }
4211
4212 /**
4213  * Get various statistics from the database
4214  * @access private
4215  */
4216 function wfLoadSiteStats() {
4217         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
4218         $fname = 'wfLoadSiteStats';
4219
4220         if ( -1 != $wgNumberOfArticles ) return;
4221         $dbr =& wfGetDB( DB_SLAVE );
4222         $s = $dbr->selectRow( 'site_stats',
4223                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
4224                 array( 'ss_row_id' => 1 ), $fname
4225         );
4226
4227         if ( $s === false ) {
4228                 return;
4229         } else {
4230                 $wgTotalViews = $s->ss_total_views;
4231                 $wgTotalEdits = $s->ss_total_edits;
4232                 $wgNumberOfArticles = $s->ss_good_articles;
4233         }
4234 }
4235
4236 /**
4237  * Escape html tags
4238  * Basically replacing " > and < with HTML entities ( &quot;, &gt;, &lt;)
4239  *
4240  * @param string $in Text that might contain HTML tags
4241  * @return string Escaped string
4242  */
4243 function wfEscapeHTMLTagsOnly( $in ) {
4244         return str_replace(
4245                 array( '"', '>', '<' ),
4246                 array( '&quot;', '&gt;', '&lt;' ),
4247                 $in );
4248 }
4249
4250 ?>