includes/Parser.php

   1 <?php
   2
   3 /**
   4  * File for Parser and related classes
   5  *
   6  * @package MediaWiki
   7  */
   8
   9 /**
  10  * Update this version number when the ParserOutput format
  11  * changes in an incompatible way, so the parser cache
  12  * can automatically discard old data.
  13  */
  14 define( 'MW_PARSER_VERSION', '1.4.0' );
  15
  16 /**
  17  * Variable substitution O(N^2) attack
  18  *
  19  * Without countermeasures, it would be possible to attack the parser by saving
  20  * a page filled with a large number of inclusions of large pages. The size of
  21  * the generated page would be proportional to the square of the input size.
  22  * Hence, we limit the number of inclusions of any given page, thus bringing any
  23  * attack back to O(N).
  24  */
  25
  26 define( 'MAX_INCLUDE_REPEAT', 100 );
  27 define( 'MAX_INCLUDE_SIZE', 1000000 ); // 1 Million
  28
  29 define( 'RLH_FOR_UPDATE', 1 );
  30
  31 # Allowed values for $mOutputType
  32 define( 'OT_HTML', 1 );
  33 define( 'OT_WIKI', 2 );
  34 define( 'OT_MSG' , 3 );
  35
  36 # string parameter for extractTags which will cause it
  37 # to strip HTML comments in addition to regular
  38 # <XML>-style tags. This should not be anything we
  39 # may want to use in wikisyntax
  40 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  41
  42 # prefix for escaping, used in two functions at least
  43 define( 'UNIQ_PREFIX', 'NaodW29');
  44
  45 # Constants needed for external link processing
  46 define( 'URL_PROTOCOLS', 'http|https|ftp|irc|gopher|news|mailto' );
  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',  '/\[(\b('.URL_PROTOCOLS.'):'.EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/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, $wgDateFormatter, $wgLinkCache
  77  *
  78  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  79  *
  80  * settings:
  81  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  82  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  83  *  $wgLocaltimezone
  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;
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState = array();
 100         var $mVariables, $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101
 102         # Temporary:
 103         var $mOptions, $mTitle, $mOutputType,
 104             $mTemplates,        // cache of already loaded templates, avoids
 105                                 // multiple SQL queries for the same string
 106             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 107                                 // in this path. Used for loop detection.
 108
 109         /**#@-*/
 110
 111         /**
 112          * Constructor
 113          *
 114          * @access public
 115          */
 116         function Parser() {
 117                 $this->mTemplates = array();
 118                 $this->mTemplatePath = array();
 119                 $this->mTagHooks = array();
 120                 $this->clearState();
 121         }
 122
 123         /**
 124          * Clear Parser state
 125          *
 126          * @access private
 127          */
 128         function clearState() {
 129                 $this->mOutput = new ParserOutput;
 130                 $this->mAutonumber = 0;
 131                 $this->mLastSection = "";
 132                 $this->mDTopen = false;
 133                 $this->mVariables = false;
 134                 $this->mIncludeCount = array();
 135                 $this->mStripState = array();
 136                 $this->mArgStack = array();
 137                 $this->mInPre = false;
 138         }
 139
 140         /**
 141          * First pass--just handle <nowiki> sections, pass the rest off
 142          * to internalParse() which does all the real work.
 143          *
 144          * @access private
 145          * @return ParserOutput a ParserOutput
 146          */
 147         function parse( $text, &$title, $options, $linestart = true, $clearState = true ) {
 148                 global $wgUseTidy, $wgContLang;
 149                 $fname = 'Parser::parse';
 150                 wfProfileIn( $fname );
 151
 152                 if ( $clearState ) {
 153                         $this->clearState();
 154                 }
 155
 156                 $this->mOptions = $options;
 157                 $this->mTitle =& $title;
 158                 $this->mOutputType = OT_HTML;
 159
 160                 $stripState = NULL;
 161                 global $fnord; $fnord = 1;
 162                 //$text = $this->strip( $text, $this->mStripState );
 163                 // VOODOO MAGIC FIX! Sometimes the above segfaults in PHP5.
 164                 $x =& $this->mStripState;
 165                 $text = $this->strip( $text, $x );
 166
 167                 $text = $this->internalParse( $text, $linestart );
 168                 $text = $this->unstrip( $text, $this->mStripState );
 169                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 170                 if(!$wgUseTidy) {
 171                         $fixtags = array(
 172                                 # french spaces, last one Guillemet-left
 173                                 # only if there is something before the space
 174                                 '/(.) (?=\\?|:|;|!|\\302\\273)/i' => '\\1&nbsp;\\2',
 175                                 # french spaces, Guillemet-right
 176                                 "/(\\302\\253) /i"=>"\\1&nbsp;",
 177                                 '/<hr *>/i' => '<hr />',
 178                                 '/<br *>/i' => '<br />',
 179                                 '/<center *>/i' => '<div class="center">',
 180                                 '/<\\/center *>/i' => '</div>',
 181                                 # Clean up spare ampersands; note that we probably ought to be
 182                                 # more careful about named entities.
 183                                 '/&(?!:amp;|#[Xx][0-9A-fa-f]+;|#[0-9]+;|[a-zA-Z0-9]+;)/' => '&amp;'
 184                         );
 185                         $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 186                 } else {
 187                         $fixtags = array(
 188                                 # french spaces, last one Guillemet-left
 189                                 '/ (\\?|:|;|!|\\302\\273)/i' => '&nbsp;\\1',
 190                                 # french spaces, Guillemet-right
 191                                 '/(\\302\\253) /i' => '\\1&nbsp;',
 192                                 '/<center *>/i' => '<div class="center">',
 193                                 '/<\\/center *>/i' => '</div>'
 194                         );
 195                         $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 196                 }
 197                 # only once and last
 198                 $text = $this->doBlockLevels( $text, $linestart );
 199
 200                 $this->replaceLinkHolders( $text );
 201                 $text = $wgContLang->convert($text);
 202
 203                 $text = $this->unstripNoWiki( $text, $this->mStripState );
 204                 global $wgUseTidy;
 205                 if ($wgUseTidy) {
 206                         $text = Parser::tidy($text);
 207                 }
 208
 209                 $this->mOutput->setText( $text );
 210                 wfProfileOut( $fname );
 211                 return $this->mOutput;
 212         }
 213
 214         /**
 215          * Get a random string
 216          *
 217          * @access private
 218          * @static
 219          */
 220         function getRandomString() {
 221                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 222         }
 223
 224         /**
 225          * Replaces all occurrences of <$tag>content</$tag> in the text
 226          * with a random marker and returns the new text. the output parameter
 227          * $content will be an associative array filled with data on the form
 228          * $unique_marker => content.
 229          *
 230          * If $content is already set, the additional entries will be appended
 231          * If $tag is set to STRIP_COMMENTS, the function will extract
 232          * <!-- HTML comments -->
 233          *
 234          * @access private
 235          * @static
 236          */
 237         function extractTags($tag, $text, &$content, $uniq_prefix = ''){
 238                 $rnd = $uniq_prefix . '-' . $tag . Parser::getRandomString();
 239                 if ( !$content ) {
 240                         $content = array( );
 241                 }
 242                 $n = 1;
 243                 $stripped = '';
 244
 245                 while ( '' != $text ) {
 246                         if($tag==STRIP_COMMENTS) {
 247                                 $p = preg_split( '/<!--/i', $text, 2 );
 248                         } else {
 249                                 $p = preg_split( "/<\\s*$tag\\s*>/i", $text, 2 );
 250                         }
 251                         $stripped .= $p[0];
 252                         if ( ( count( $p ) < 2 ) || ( '' == $p[1] ) ) {
 253                                 $text = '';
 254                         } else {
 255                                 if($tag==STRIP_COMMENTS) {
 256                                         $q = preg_split( '/-->/i', $p[1], 2 );
 257                                 } else {
 258                                         $q = preg_split( "/<\\/\\s*$tag\\s*>/i", $p[1], 2 );
 259                                 }
 260                                 $marker = $rnd . sprintf('%08X', $n++);
 261                                 $content[$marker] = $q[0];
 262                                 $stripped .= $marker;
 263                                 $text = $q[1];
 264                         }
 265                 }
 266                 return $stripped;
 267         }
 268
 269         /**
 270          * Strips and renders nowiki, pre, math, hiero
 271          * If $render is set, performs necessary rendering operations on plugins
 272          * Returns the text, and fills an array with data needed in unstrip()
 273          * If the $state is already a valid strip state, it adds to the state
 274          *
 275          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 276          *  will be stripped in addition to other tags. This is important
 277          *  for section editing, where these comments cause confusion when
 278          *  counting the sections in the wikisource
 279          *
 280          * @access private
 281          */
 282         function strip( $text, &$state, $stripcomments = false ) {
 283                 $render = ($this->mOutputType == OT_HTML);
 284                 $html_content = array();
 285                 $nowiki_content = array();
 286                 $math_content = array();
 287                 $pre_content = array();
 288                 $comment_content = array();
 289                 $ext_content = array();
 290                 $gallery_content = array();
 291
 292                 # Replace any instances of the placeholders
 293                 $uniq_prefix = UNIQ_PREFIX;
 294                 #$text = str_replace( $uniq_prefix, wfHtmlEscapeFirst( $uniq_prefix ), $text );
 295
 296                 # html
 297                 global $wgRawHtml, $wgWhitelistEdit;
 298                 if( $wgRawHtml && $wgWhitelistEdit ) {
 299                         $text = Parser::extractTags('html', $text, $html_content, $uniq_prefix);
 300                         foreach( $html_content as $marker => $content ) {
 301                                 if ($render ) {
 302                                         # Raw and unchecked for validity.
 303                                         $html_content[$marker] = $content;
 304                                 } else {
 305                                         $html_content[$marker] = '<html>'.$content.'</html>';
 306                                 }
 307                         }
 308                 }
 309
 310                 # nowiki
 311                 $text = Parser::extractTags('nowiki', $text, $nowiki_content, $uniq_prefix);
 312                 foreach( $nowiki_content as $marker => $content ) {
 313                         if( $render ){
 314                                 $nowiki_content[$marker] = wfEscapeHTMLTagsOnly( $content );
 315                         } else {
 316                                 $nowiki_content[$marker] = '<nowiki>'.$content.'</nowiki>';
 317                         }
 318                 }
 319
 320                 # math
 321                 $text = Parser::extractTags('math', $text, $math_content, $uniq_prefix);
 322                 foreach( $math_content as $marker => $content ){
 323                         if( $render ) {
 324                                 if( $this->mOptions->getUseTeX() ) {
 325                                         $math_content[$marker] = renderMath( $content );
 326                                 } else {
 327                                         $math_content[$marker] = '&lt;math&gt;'.$content.'&lt;math&gt;';
 328                                 }
 329                         } else {
 330                                 $math_content[$marker] = '<math>'.$content.'</math>';
 331                         }
 332                 }
 333
 334                 # pre
 335                 $text = Parser::extractTags('pre', $text, $pre_content, $uniq_prefix);
 336                 foreach( $pre_content as $marker => $content ){
 337                         if( $render ){
 338                                 $pre_content[$marker] = '<pre>' . wfEscapeHTMLTagsOnly( $content ) . '</pre>';
 339                         } else {
 340                                 $pre_content[$marker] = '<pre>'.$content.'</pre>';
 341                         }
 342                 }
 343
 344                 # gallery
 345                 $text = Parser::extractTags('gallery', $text, $gallery_content, $uniq_prefix);
 346                 foreach( $gallery_content as $marker => $content ) {
 347                         require_once( 'ImageGallery.php' );
 348                         if ( $render ) {
 349                                 $gallery_content[$marker] = Parser::renderImageGallery( $content );
 350                         } else {
 351                                 $gallery_content[$marker] = '<gallery>'.$content.'</gallery>';
 352                         }
 353                 }
 354
 355                 # Comments
 356                 if($stripcomments) {
 357                         $text = Parser::extractTags(STRIP_COMMENTS, $text, $comment_content, $uniq_prefix);
 358                         foreach( $comment_content as $marker => $content ){
 359                                 $comment_content[$marker] = '<!--'.$content.'-->';
 360                         }
 361                 }
 362
 363                 # Extensions
 364                 foreach ( $this->mTagHooks as $tag => $callback ) {
 365                         $ext_contents[$tag] = array();
 366                         $text = Parser::extractTags( $tag, $text, $ext_content[$tag], $uniq_prefix );
 367                         foreach( $ext_content[$tag] as $marker => $content ) {
 368                                 if ( $render ) {
 369                                         $ext_content[$tag][$marker] = $callback( $content );
 370                                 } else {
 371                                         $ext_content[$tag][$marker] = "<$tag>$content</$tag>";
 372                                 }
 373                         }
 374                 }
 375
 376                 # Merge state with the pre-existing state, if there is one
 377                 if ( $state ) {
 378                         $state['html'] = $state['html'] + $html_content;
 379                         $state['nowiki'] = $state['nowiki'] + $nowiki_content;
 380                         $state['math'] = $state['math'] + $math_content;
 381                         $state['pre'] = $state['pre'] + $pre_content;
 382                         $state['comment'] = $state['comment'] + $comment_content;
 383                         $state['gallery'] = $state['gallery'] + $gallery_content;
 384
 385                         foreach( $ext_content as $tag => $array ) {
 386                                 if ( array_key_exists( $tag, $state ) ) {
 387                                         $state[$tag] = $state[$tag] + $array;
 388                                 }
 389                         }
 390                 } else {
 391                         $state = array(
 392                           'html' => $html_content,
 393                           'nowiki' => $nowiki_content,
 394                           'math' => $math_content,
 395                           'pre' => $pre_content,
 396                           'comment' => $comment_content,
 397                           'gallery' => $gallery_content,
 398                         ) + $ext_content;
 399                 }
 400                 return $text;
 401         }
 402
 403         /**
 404          * restores pre, math, and hiero removed by strip()
 405          *
 406          * always call unstripNoWiki() after this one
 407          * @access private
 408          */
 409         function unstrip( $text, &$state ) {
 410                 # Must expand in reverse order, otherwise nested tags will be corrupted
 411                 $contentDict = end( $state );
 412                 for ( $contentDict = end( $state ); $contentDict !== false; $contentDict = prev( $state ) ) {
 413                         if( key($state) != 'nowiki' && key($state) != 'html') {
 414                                 for ( $content = end( $contentDict ); $content !== false; $content = prev( $contentDict ) ) {
 415                                         $text = str_replace( key( $contentDict ), $content, $text );
 416                                 }
 417                         }
 418                 }
 419
 420                 return $text;
 421         }
 422
 423         /**
 424          * always call this after unstrip() to preserve the order
 425          *
 426          * @access private
 427          */
 428         function unstripNoWiki( $text, &$state ) {
 429                 # Must expand in reverse order, otherwise nested tags will be corrupted
 430                 for ( $content = end($state['nowiki']); $content !== false; $content = prev( $state['nowiki'] ) ) {
 431                         $text = str_replace( key( $state['nowiki'] ), $content, $text );
 432                 }
 433
 434                 global $wgRawHtml;
 435                 if ($wgRawHtml) {
 436                         for ( $content = end($state['html']); $content !== false; $content = prev( $state['html'] ) ) {
 437                                 $text = str_replace( key( $state['html'] ), $content, $text );
 438                         }
 439                 }
 440
 441                 return $text;
 442         }
 443
 444         /**
 445          * Add an item to the strip state
 446          * Returns the unique tag which must be inserted into the stripped text
 447          * The tag will be replaced with the original text in unstrip()
 448          *
 449          * @access private
 450          */
 451         function insertStripItem( $text, &$state ) {
 452                 $rnd = UNIQ_PREFIX . '-item' . Parser::getRandomString();
 453                 if ( !$state ) {
 454                         $state = array(
 455                           'html' => array(),
 456                           'nowiki' => array(),
 457                           'math' => array(),
 458                           'pre' => array()
 459                         );
 460                 }
 461                 $state['item'][$rnd] = $text;
 462                 return $rnd;
 463         }
 464
 465         /**
 466          * Return allowed HTML attributes
 467          *
 468          * @access private
 469          */
 470         function getHTMLattrs () {
 471                 $htmlattrs = array( # Allowed attributes--no scripting, etc.
 472                                 'title', 'align', 'lang', 'dir', 'width', 'height',
 473                                 'bgcolor', 'clear', /* BR */ 'noshade', /* HR */
 474                                 'cite', /* BLOCKQUOTE, Q */ 'size', 'face', 'color',
 475                                 /* FONT */ 'type', 'start', 'value', 'compact',
 476                                 /* For various lists, mostly deprecated but safe */
 477                                 'summary', 'width', 'border', 'frame', 'rules',
 478                                 'cellspacing', 'cellpadding', 'valign', 'char',
 479                                 'charoff', 'colgroup', 'col', 'span', 'abbr', 'axis',
 480                                 'headers', 'scope', 'rowspan', 'colspan', /* Tables */
 481                                 'id', 'class', 'name', 'style' /* For CSS */
 482                                 );
 483                 return $htmlattrs ;
 484         }
 485
 486         /**
 487          * Remove non approved attributes and javascript in css
 488          *
 489          * @access private
 490          */
 491         function fixTagAttributes ( $t ) {
 492                 if ( trim ( $t ) == '' ) return '' ; # Saves runtime ;-)
 493                 $htmlattrs = $this->getHTMLattrs() ;
 494
 495                 # Strip non-approved attributes from the tag
 496                 $t = preg_replace(
 497                         '/(\\w+)(\\s*=\\s*([^\\s\">]+|\"[^\">]*\"))?/e',
 498                         "(in_array(strtolower(\"\$1\"),\$htmlattrs)?(\"\$1\".((\"x\$3\" != \"x\")?\"=\$3\":'')):'')",
 499                         $t);
 500
 501                 $t = str_replace ( '<></>' , '' , $t ) ; # This should fix bug 980557
 502
 503                 # Strip javascript "expression" from stylesheets. Brute force approach:
 504                 # If anythin offensive is found, all attributes of the HTML tag are dropped
 505
 506                 if( preg_match(
 507                         '/style\\s*=.*(expression|tps*:\/\/|url\\s*\().*/is',
 508                         wfMungeToUtf8( $t ) ) )
 509                 {
 510                         $t='';
 511                 }
 512
 513                 return trim ( $t ) ;
 514         }
 515
 516         /**
 517          * interface with html tidy, used if $wgUseTidy = true
 518          *
 519          * @access public
 520          * @static
 521          */
 522         function tidy ( $text ) {
 523                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 524                 global $wgInputEncoding, $wgOutputEncoding;
 525                 $fname = 'Parser::tidy';
 526                 wfProfileIn( $fname );
 527
 528                 $cleansource = '';
 529                 $opts = '';
 530                 switch(strtoupper($wgOutputEncoding)) {
 531                         case 'ISO-8859-1':
 532                                 $opts .= ($wgInputEncoding == $wgOutputEncoding)? ' -latin1':' -raw';
 533                                 break;
 534                         case 'UTF-8':
 535                                 $opts .= ($wgInputEncoding == $wgOutputEncoding)? ' -utf8':' -raw';
 536                                 break;
 537                         default:
 538                                 $opts .= ' -raw';
 539                         }
 540
 541                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 542 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 543 '<head><title>test</title></head><body>'.$text.'</body></html>';
 544                 $descriptorspec = array(
 545                         0 => array('pipe', 'r'),
 546                         1 => array('pipe', 'w'),
 547                         2 => array('file', '/dev/null', 'a')
 548                 );
 549                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 550                 if (is_resource($process)) {
 551                         fwrite($pipes[0], $wrappedtext);
 552                         fclose($pipes[0]);
 553                         while (!feof($pipes[1])) {
 554                                 $cleansource .= fgets($pipes[1], 1024);
 555                         }
 556                         fclose($pipes[1]);
 557                         $return_value = proc_close($process);
 558                 }
 559
 560                 wfProfileOut( $fname );
 561
 562                 if( $cleansource == '' && $text != '') {
 563                         wfDebug( "Tidy error detected!\n" );
 564                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 565                 } else {
 566                         return $cleansource;
 567                 }
 568         }
 569
 570         /**
 571          * parse the wiki syntax used to render tables
 572          *
 573          * @access private
 574          */
 575         function doTableStuff ( $t ) {
 576                 $fname = 'Parser::doTableStuff';
 577                 wfProfileIn( $fname );
 578
 579                 $t = explode ( "\n" , $t ) ;
 580                 $td = array () ; # Is currently a td tag open?
 581                 $ltd = array () ; # Was it TD or TH?
 582                 $tr = array () ; # Is currently a tr tag open?
 583                 $ltr = array () ; # tr attributes
 584                 $indent_level = 0; # indent level of the table
 585                 foreach ( $t AS $k => $x )
 586                 {
 587                         $x = trim ( $x ) ;
 588                         $fc = substr ( $x , 0 , 1 ) ;
 589                         if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
 590                                 $indent_level = strlen( $matches[1] );
 591                                 $t[$k] = "\n" .
 592                                         str_repeat( '<dl><dd>', $indent_level ) .
 593                                         '<table ' . $this->fixTagAttributes ( $matches[2] ) . '>' ;
 594                                 array_push ( $td , false ) ;
 595                                 array_push ( $ltd , '' ) ;
 596                                 array_push ( $tr , false ) ;
 597                                 array_push ( $ltr , '' ) ;
 598                         }
 599                         else if ( count ( $td ) == 0 ) { } # Don't do any of the following
 600                         else if ( '|}' == substr ( $x , 0 , 2 ) ) {
 601                                 $z = "</table>\n" ;
 602                                 $l = array_pop ( $ltd ) ;
 603                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 604                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 605                                 array_pop ( $ltr ) ;
 606                                 $t[$k] = $z . str_repeat( '</dd></dl>', $indent_level );
 607                         }
 608                         else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
 609                                 $x = substr ( $x , 1 ) ;
 610                                 while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
 611                                 $z = '' ;
 612                                 $l = array_pop ( $ltd ) ;
 613                                 if ( array_pop ( $tr ) ) $z = '</tr>' . $z ;
 614                                 if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 615                                 array_pop ( $ltr ) ;
 616                                 $t[$k] = $z ;
 617                                 array_push ( $tr , false ) ;
 618                                 array_push ( $td , false ) ;
 619                                 array_push ( $ltd , '' ) ;
 620                                 array_push ( $ltr , $this->fixTagAttributes ( $x ) ) ;
 621                         }
 622                         else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
 623                                 # $x is a table row
 624                                 if ( '|+' == substr ( $x , 0 , 2 ) ) {
 625                                         $fc = '+' ;
 626                                         $x = substr ( $x , 1 ) ;
 627                                 }
 628                                 $after = substr ( $x , 1 ) ;
 629                                 if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
 630                                 $after = explode ( '||' , $after ) ;
 631                                 $t[$k] = '' ;
 632
 633                                 # Loop through each table cell
 634                                 foreach ( $after AS $theline )
 635                                 {
 636                                         $z = '' ;
 637                                         if ( $fc != '+' )
 638                                         {
 639                                                 $tra = array_pop ( $ltr ) ;
 640                                                 if ( !array_pop ( $tr ) ) $z = '<tr '.$tra.">\n" ;
 641                                                 array_push ( $tr , true ) ;
 642                                                 array_push ( $ltr , '' ) ;
 643                                         }
 644
 645                                         $l = array_pop ( $ltd ) ;
 646                                         if ( array_pop ( $td ) ) $z = '</'.$l.'>' . $z ;
 647                                         if ( $fc == '|' ) $l = 'td' ;
 648                                         else if ( $fc == '!' ) $l = 'th' ;
 649                                         else if ( $fc == '+' ) $l = 'caption' ;
 650                                         else $l = '' ;
 651                                         array_push ( $ltd , $l ) ;
 652
 653                                         # Cell parameters
 654                                         $y = explode ( '|' , $theline , 2 ) ;
 655                                         # Note that a '|' inside an invalid link should not
 656                                         # be mistaken as delimiting cell parameters
 657                                         if ( strpos( $y[0], '[[' ) !== false ) {
 658                                                 $y = array ($theline);
 659                                         }
 660                                         if ( count ( $y ) == 1 )
 661                                                 $y = "{$z}<{$l}>{$y[0]}" ;
 662                                         else $y = $y = "{$z}<{$l} ".$this->fixTagAttributes($y[0]).">{$y[1]}" ;
 663                                         $t[$k] .= $y ;
 664                                         array_push ( $td , true ) ;
 665                                 }
 666                         }
 667                 }
 668
 669                 # Closing open td, tr && table
 670                 while ( count ( $td ) > 0 )
 671                 {
 672                         if ( array_pop ( $td ) ) $t[] = '</td>' ;
 673                         if ( array_pop ( $tr ) ) $t[] = '</tr>' ;
 674                         $t[] = '</table>' ;
 675                 }
 676
 677                 $t = implode ( "\n" , $t ) ;
 678                 #               $t = $this->removeHTMLtags( $t );
 679                 wfProfileOut( $fname );
 680                 return $t ;
 681         }
 682
 683         /**
 684          * Helper function for parse() that transforms wiki markup into
 685          * HTML. Only called for $mOutputType == OT_HTML.
 686          *
 687          * @access private
 688          */
 689         function internalParse( $text, $linestart, $args = array(), $isMain=true ) {
 690                 global $wgContLang;
 691
 692                 $fname = 'Parser::internalParse';
 693                 wfProfileIn( $fname );
 694
 695                 $text = $this->removeHTMLtags( $text );
 696                 $text = $this->replaceVariables( $text, $args );
 697
 698                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 699
 700                 $text = $this->doHeadings( $text );
 701                 if($this->mOptions->getUseDynamicDates()) {
 702                         global $wgDateFormatter;
 703                         $text = $wgDateFormatter->reformat( $this->mOptions->getDateFormat(), $text );
 704                 }
 705                 $text = $this->doAllQuotes( $text );
 706                 $text = $this->replaceInternalLinks( $text );
 707                 $text = $this->replaceExternalLinks( $text );
 708
 709                 # replaceInternalLinks may sometimes leave behind
 710                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 711                 $text = str_replace("http-noparse://","http://",$text);
 712
 713                 $text = $this->doMagicLinks( $text );
 714                 $text = $this->doTableStuff( $text );
 715                 $text = $this->formatHeadings( $text, $isMain );
 716
 717                 wfProfileOut( $fname );
 718                 return $text;
 719         }
 720
 721         /**
 722          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 723          * magic external links.
 724          *
 725          * @access private
 726          */
 727         function &doMagicLinks( &$text ) {
 728                 global $wgUseGeoMode;
 729                 $text = $this->magicISBN( $text );
 730                 if ( isset( $wgUseGeoMode ) && $wgUseGeoMode ) {
 731                         $text = $this->magicGEO( $text );
 732                 }
 733                 $text = $this->magicRFC( $text, 'RFC ', 'rfcurl' );
 734                 $text = $this->magicRFC( $text, 'PMID ', 'pubmedurl' );
 735                 return $text;
 736         }
 737
 738         /**
 739          * Parse ^^ tokens and return html
 740          *
 741          * @access private
 742          */
 743         function doExponent( $text ) {
 744                 $fname = 'Parser::doExponent';
 745                 wfProfileIn( $fname );
 746                 $text = preg_replace('/\^\^(.*)\^\^/','<small><sup>\\1</sup></small>', $text);
 747                 wfProfileOut( $fname );
 748                 return $text;
 749         }
 750
 751         /**
 752          * Parse headers and return html
 753          *
 754          * @access private
 755          */
 756         function doHeadings( $text ) {
 757                 $fname = 'Parser::doHeadings';
 758                 wfProfileIn( $fname );
 759                 for ( $i = 6; $i >= 1; --$i ) {
 760                         $h = substr( '======', 0, $i );
 761                         $text = preg_replace( "/^{$h}(.+){$h}(\\s|$)/m",
 762                           "<h{$i}>\\1</h{$i}>\\2", $text );
 763                 }
 764                 wfProfileOut( $fname );
 765                 return $text;
 766         }
 767
 768         /**
 769          * Replace single quotes with HTML markup
 770          * @access private
 771          * @return string the altered text
 772          */
 773         function doAllQuotes( $text ) {
 774                 $fname = 'Parser::doAllQuotes';
 775                 wfProfileIn( $fname );
 776                 $outtext = '';
 777                 $lines = explode( "\n", $text );
 778                 foreach ( $lines as $line ) {
 779                         $outtext .= $this->doQuotes ( $line ) . "\n";
 780                 }
 781                 $outtext = substr($outtext, 0,-1);
 782                 wfProfileOut( $fname );
 783                 return $outtext;
 784         }
 785
 786         /**
 787          * Helper function for doAllQuotes()
 788          * @access private
 789          */
 790         function doQuotes( $text ) {
 791                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 792                 if ( count( $arr ) == 1 )
 793                         return $text;
 794                 else
 795                 {
 796                         # First, do some preliminary work. This may shift some apostrophes from
 797                         # being mark-up to being text. It also counts the number of occurrences
 798                         # of bold and italics mark-ups.
 799                         $i = 0;
 800                         $numbold = 0;
 801                         $numitalics = 0;
 802                         foreach ( $arr as $r )
 803                         {
 804                                 if ( ( $i % 2 ) == 1 )
 805                                 {
 806                                         # If there are ever four apostrophes, assume the first is supposed to
 807                                         # be text, and the remaining three constitute mark-up for bold text.
 808                                         if ( strlen( $arr[$i] ) == 4 )
 809                                         {
 810                                                 $arr[$i-1] .= "'";
 811                                                 $arr[$i] = "'''";
 812                                         }
 813                                         # If there are more than 5 apostrophes in a row, assume they're all
 814                                         # text except for the last 5.
 815                                         else if ( strlen( $arr[$i] ) > 5 )
 816                                         {
 817                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
 818                                                 $arr[$i] = "'''''";
 819                                         }
 820                                         # Count the number of occurrences of bold and italics mark-ups.
 821                                         # We are not counting sequences of five apostrophes.
 822                                         if ( strlen( $arr[$i] ) == 2 ) $numitalics++;  else
 823                                         if ( strlen( $arr[$i] ) == 3 ) $numbold++;     else
 824                                         if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
 825                                 }
 826                                 $i++;
 827                         }
 828
 829                         # If there is an odd number of both bold and italics, it is likely
 830                         # that one of the bold ones was meant to be an apostrophe followed
 831                         # by italics. Which one we cannot know for certain, but it is more
 832                         # likely to be one that has a single-letter word before it.
 833                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
 834                         {
 835                                 $i = 0;
 836                                 $firstsingleletterword = -1;
 837                                 $firstmultiletterword = -1;
 838                                 $firstspace = -1;
 839                                 foreach ( $arr as $r )
 840                                 {
 841                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
 842                                         {
 843                                                 $x1 = substr ($arr[$i-1], -1);
 844                                                 $x2 = substr ($arr[$i-1], -2, 1);
 845                                                 if ($x1 == ' ') {
 846                                                         if ($firstspace == -1) $firstspace = $i;
 847                                                 } else if ($x2 == ' ') {
 848                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
 849                                                 } else {
 850                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
 851                                                 }
 852                                         }
 853                                         $i++;
 854                                 }
 855
 856                                 # If there is a single-letter word, use it!
 857                                 if ($firstsingleletterword > -1)
 858                                 {
 859                                         $arr [ $firstsingleletterword ] = "''";
 860                                         $arr [ $firstsingleletterword-1 ] .= "'";
 861                                 }
 862                                 # If not, but there's a multi-letter word, use that one.
 863                                 else if ($firstmultiletterword > -1)
 864                                 {
 865                                         $arr [ $firstmultiletterword ] = "''";
 866                                         $arr [ $firstmultiletterword-1 ] .= "'";
 867                                 }
 868                                 # ... otherwise use the first one that has neither.
 869                                 # (notice that it is possible for all three to be -1 if, for example,
 870                                 # there is only one pentuple-apostrophe in the line)
 871                                 else if ($firstspace > -1)
 872                                 {
 873                                         $arr [ $firstspace ] = "''";
 874                                         $arr [ $firstspace-1 ] .= "'";
 875                                 }
 876                         }
 877
 878                         # Now let's actually convert our apostrophic mush to HTML!
 879                         $output = '';
 880                         $buffer = '';
 881                         $state = '';
 882                         $i = 0;
 883                         foreach ($arr as $r)
 884                         {
 885                                 if (($i % 2) == 0)
 886                                 {
 887                                         if ($state == 'both')
 888                                                 $buffer .= $r;
 889                                         else
 890                                                 $output .= $r;
 891                                 }
 892                                 else
 893                                 {
 894                                         if (strlen ($r) == 2)
 895                                         {
 896                                                 if ($state == 'i')
 897                                                 { $output .= '</i>'; $state = ''; }
 898                                                 else if ($state == 'bi')
 899                                                 { $output .= '</i>'; $state = 'b'; }
 900                                                 else if ($state == 'ib')
 901                                                 { $output .= '</b></i><b>'; $state = 'b'; }
 902                                                 else if ($state == 'both')
 903                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
 904                                                 else # $state can be 'b' or ''
 905                                                 { $output .= '<i>'; $state .= 'i'; }
 906                                         }
 907                                         else if (strlen ($r) == 3)
 908                                         {
 909                                                 if ($state == 'b')
 910                                                 { $output .= '</b>'; $state = ''; }
 911                                                 else if ($state == 'bi')
 912                                                 { $output .= '</i></b><i>'; $state = 'i'; }
 913                                                 else if ($state == 'ib')
 914                                                 { $output .= '</b>'; $state = 'i'; }
 915                                                 else if ($state == 'both')
 916                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
 917                                                 else # $state can be 'i' or ''
 918                                                 { $output .= '<b>'; $state .= 'b'; }
 919                                         }
 920                                         else if (strlen ($r) == 5)
 921                                         {
 922                                                 if ($state == 'b')
 923                                                 { $output .= '</b><i>'; $state = 'i'; }
 924                                                 else if ($state == 'i')
 925                                                 { $output .= '</i><b>'; $state = 'b'; }
 926                                                 else if ($state == 'bi')
 927                                                 { $output .= '</i></b>'; $state = ''; }
 928                                                 else if ($state == 'ib')
 929                                                 { $output .= '</b></i>'; $state = ''; }
 930                                                 else if ($state == 'both')
 931                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
 932                                                 else # ($state == '')
 933                                                 { $buffer = ''; $state = 'both'; }
 934                                         }
 935                                 }
 936                                 $i++;
 937                         }
 938                         # Now close all remaining tags.  Notice that the order is important.
 939                         if ($state == 'b' || $state == 'ib')
 940                                 $output .= '</b>';
 941                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
 942                                 $output .= '</i>';
 943                         if ($state == 'bi')
 944                                 $output .= '</b>';
 945                         if ($state == 'both')
 946                                 $output .= '<b><i>'.$buffer.'</i></b>';
 947                         return $output;
 948                 }
 949         }
 950
 951         /**
 952          * Replace external links
 953          *
 954          * Note: this is all very hackish and the order of execution matters a lot.
 955          * Make sure to run maintenance/parserTests.php if you change this code.
 956          *
 957          * @access private
 958          */
 959         function replaceExternalLinks( $text ) {
 960                 $fname = 'Parser::replaceExternalLinks';
 961                 wfProfileIn( $fname );
 962
 963                 $sk =& $this->mOptions->getSkin();
 964                 global $wgContLang;
 965                 $linktrail = $wgContLang->linkTrail();
 966
 967                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
 968
 969                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
 970
 971                 $i = 0;
 972                 while ( $i<count( $bits ) ) {
 973                         $url = $bits[$i++];
 974                         $protocol = $bits[$i++];
 975                         $text = $bits[$i++];
 976                         $trail = $bits[$i++];
 977
 978                         # The characters '<' and '>' (which were escaped by
 979                         # removeHTMLtags()) should not be included in
 980                         # URLs, per RFC 2396.
 981                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
 982                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
 983                                 $url = substr($url, 0, $m2[0][1]);
 984                         }
 985
 986                         # If the link text is an image URL, replace it with an <img> tag
 987                         # This happened by accident in the original parser, but some people used it extensively
 988                         $img = $this->maybeMakeImageLink( $text );
 989                         if ( $img !== false ) {
 990                                 $text = $img;
 991                         }
 992
 993                         $dtrail = '';
 994
 995                         # Set linktype for CSS - if URL==text, link is essentially free
 996                         $linktype = ($text == $url) ? 'free' : 'text';
 997
 998                         # No link text, e.g. [http://domain.tld/some.link]
 999                         if ( $text == '' ) {
1000                                 # Autonumber if allowed
1001                                 if ( strpos( HTTP_PROTOCOLS, $protocol ) !== false ) {
1002                                         $text = '[' . ++$this->mAutonumber . ']';
1003                                         $linktype = 'autonumber';
1004                                 } else {
1005                                         # Otherwise just use the URL
1006                                         $text = htmlspecialchars( $url );
1007                                         $linktype = 'free';
1008                                 }
1009                         } else {
1010                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1011                                 # Check for trail
1012                                 if ( preg_match( $linktrail, $trail, $m2 ) ) {
1013                                         $dtrail = $m2[1];
1014                                         $trail = $m2[2];
1015                                 }
1016                         }
1017
1018                         # Process the trail (i.e. everything after this link up until start of the next link),
1019                         # replacing any non-bracketed links
1020                         $trail = $this->replaceFreeExternalLinks( $trail );
1021
1022                         # Use the encoded URL
1023                         # This means that users can paste URLs directly into the text
1024                         # Funny characters like &ouml; aren't valid in URLs anyway
1025                         # This was changed in August 2004
1026                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype ) . $dtrail . $trail;
1027                 }
1028
1029                 wfProfileOut( $fname );
1030                 return $s;
1031         }
1032
1033         /**
1034          * Replace anything that looks like a URL with a link
1035          * @access private
1036          */
1037         function replaceFreeExternalLinks( $text ) {
1038                 $fname = 'Parser::replaceFreeExternalLinks';
1039                 wfProfileIn( $fname );
1040
1041                 $bits = preg_split( '/(\b(?:'.URL_PROTOCOLS.'):)/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1042                 $s = array_shift( $bits );
1043                 $i = 0;
1044
1045                 $sk =& $this->mOptions->getSkin();
1046
1047                 while ( $i < count( $bits ) ){
1048                         $protocol = $bits[$i++];
1049                         $remainder = $bits[$i++];
1050
1051                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1052                                 # Found some characters after the protocol that look promising
1053                                 $url = $protocol . $m[1];
1054                                 $trail = $m[2];
1055
1056                                 # The characters '<' and '>' (which were escaped by
1057                                 # removeHTMLtags()) should not be included in
1058                                 # URLs, per RFC 2396.
1059                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1060                                         $trail = substr($url, $m2[0][1]) . $trail;
1061                                         $url = substr($url, 0, $m2[0][1]);
1062                                 }
1063
1064                                 # Move trailing punctuation to $trail
1065                                 $sep = ',;\.:!?';
1066                                 # If there is no left bracket, then consider right brackets fair game too
1067                                 if ( strpos( $url, '(' ) === false ) {
1068                                         $sep .= ')';
1069                                 }
1070
1071                                 $numSepChars = strspn( strrev( $url ), $sep );
1072                                 if ( $numSepChars ) {
1073                                         $trail = substr( $url, -$numSepChars ) . $trail;
1074                                         $url = substr( $url, 0, -$numSepChars );
1075                                 }
1076
1077                                 # Replace &amp; from obsolete syntax with &.
1078                                 # All HTML entities will be escaped by makeExternalLink()
1079                                 # or maybeMakeImageLink()
1080                                 $url = str_replace( '&amp;', '&', $url );
1081
1082                                 # Is this an external image?
1083                                 $text = $this->maybeMakeImageLink( $url );
1084                                 if ( $text === false ) {
1085                                         # Not an image, make a link
1086                                         $text = $sk->makeExternalLink( $url, $url, true, 'free' );
1087                                 }
1088                                 $s .= $text . $trail;
1089                         } else {
1090                                 $s .= $protocol . $remainder;
1091                         }
1092                 }
1093                 wfProfileOut();
1094                 return $s;
1095         }
1096
1097         /**
1098          * make an image if it's allowed
1099          * @access private
1100          */
1101         function maybeMakeImageLink( $url ) {
1102                 $sk =& $this->mOptions->getSkin();
1103                 $text = false;
1104                 if ( $this->mOptions->getAllowExternalImages() ) {
1105                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1106                                 # Image found
1107                                 $text = $sk->makeImage( htmlspecialchars( $url ) );
1108                         }
1109                 }
1110                 return $text;
1111         }
1112
1113         /**
1114          * Process [[ ]] wikilinks
1115          *
1116          * @access private
1117          */
1118
1119         function replaceInternalLinks( $s ) {
1120                 global $wgLang, $wgContLang, $wgLinkCache;
1121                 global $wgDisableLangConversion;
1122                 static $fname = 'Parser::replaceInternalLinks' ;
1123
1124                 wfProfileIn( $fname );
1125
1126                 wfProfileIn( $fname.'-setup' );
1127                 static $tc = FALSE;
1128                 # the % is needed to support urlencoded titles as well
1129                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1130
1131                 $sk =& $this->mOptions->getSkin();
1132                 global $wgUseOldExistenceCheck;
1133                 # "Post-parse link colour check" works only on wiki text since it's now
1134                 # in Parser. Enable it, then disable it when we're done.
1135                 $saveParseColour = $sk->postParseLinkColour( !$wgUseOldExistenceCheck );
1136
1137                 $redirect = MagicWord::get ( MAG_REDIRECT ) ;
1138
1139                 #split the entire text string on occurences of [[
1140                 $a = explode( '[[', ' ' . $s );
1141                 #get the first element (all text up to first [[), and remove the space we added
1142                 $s = array_shift( $a );
1143                 $s = substr( $s, 1 );
1144
1145                 # Match a link having the form [[namespace:link|alternate]]trail
1146                 static $e1 = FALSE;
1147                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1148                 # Match cases where there is no "]]", which might still be images
1149                 static $e1_img = FALSE;
1150                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1151                 # Match the end of a line for a word that's not followed by whitespace,
1152                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1153                 static $e2 = '/^(.*?)([a-zA-Z\x80-\xff]+)$/sD';
1154
1155                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1156
1157                 $nottalk = !Namespace::isTalk( $this->mTitle->getNamespace() );
1158
1159                 if ( $useLinkPrefixExtension ) {
1160                         if ( preg_match( $e2, $s, $m ) ) {
1161                                 $first_prefix = $m[2];
1162                                 $s = $m[1];
1163                         } else {
1164                                 $first_prefix = false;
1165                         }
1166                 } else {
1167                         $prefix = '';
1168                 }
1169
1170                 $selflink = $this->mTitle->getPrefixedText();
1171                 wfProfileOut( $fname.'-setup' );
1172
1173                 $checkVariantLink = sizeof($wgContLang->getVariants())>1;
1174                 $useSubpages = $this->areSubpagesAllowed();
1175
1176                 # Loop for each link
1177                 for ($k = 0; isset( $a[$k] ); $k++) {
1178                         $line = $a[$k];
1179                         if ( $useLinkPrefixExtension ) {
1180                                 wfProfileIn( $fname.'-prefixhandling' );
1181                                 if ( preg_match( $e2, $s, $m ) ) {
1182                                         $prefix = $m[2];
1183                                         $s = $m[1];
1184                                 } else {
1185                                         $prefix='';
1186                                 }
1187                                 # first link
1188                                 if($first_prefix) {
1189                                         $prefix = $first_prefix;
1190                                         $first_prefix = false;
1191                                 }
1192                                 wfProfileOut( $fname.'-prefixhandling' );
1193                         }
1194
1195                         $might_be_img = false;
1196
1197                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1198                                 $text = $m[2];
1199                                 # fix up urlencoded title texts
1200                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1201                                 $trail = $m[3];
1202                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1203                                 $might_be_img = true;
1204                                 $text = $m[2];
1205                                 if(preg_match('/%/', $m[1] )) $m[1] = urldecode($m[1]);
1206                                 $trail = "";
1207                         } else { # Invalid form; output directly
1208                                 $s .= $prefix . '[[' . $line ;
1209                                 continue;
1210                         }
1211
1212                         # Don't allow internal links to pages containing
1213                         # PROTO: where PROTO is a valid URL protocol; these
1214                         # should be external links.
1215                         if (preg_match('/^(\b(?:'.URL_PROTOCOLS.'):)/', $m[1])) {
1216                                 $s .= $prefix . '[[' . $line ;
1217                                 continue;
1218                         }
1219
1220                         # Make subpage if necessary
1221                         if( $useSubpages ) {
1222                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1223                         } else {
1224                                 $link = $m[1];
1225                         }
1226
1227                         $noforce = (substr($m[1], 0, 1) != ':');
1228                         if (!$noforce) {
1229                                 # Strip off leading ':'
1230                                 $link = substr($link, 1);
1231                         }
1232
1233                         $nt =& Title::newFromText( $this->unstripNoWiki($link, $this->mStripState) );
1234                         if( !$nt ) {
1235                                 $s .= $prefix . '[[' . $line;
1236                                 continue;
1237                         }
1238
1239                         #check other language variants of the link
1240                         #if the article does not exist
1241                         if( $checkVariantLink
1242                             && $nt->getArticleID() == 0 ) {
1243                                 $wgContLang->findVariantLink($link, $nt);
1244                         }
1245
1246                         $ns = $nt->getNamespace();
1247                         $iw = $nt->getInterWiki();
1248
1249                         if ($might_be_img) { # if this is actually an invalid link
1250                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1251                                         $found = false;
1252                                         while (isset ($a[$k+1]) ) {
1253                                                 #look at the next 'line' to see if we can close it there
1254                                                 $next_line =  array_shift(array_splice( $a, $k + 1, 1) );
1255                                                 if( preg_match("/^(.*?]].*?)]](.*)$/sD", $next_line, $m) ) {
1256                                                 # the first ]] closes the inner link, the second the image
1257                                                         $found = true;
1258                                                         $text .= '[[' . $m[1];
1259                                                         $trail = $m[2];
1260                                                         break;
1261                                                 } elseif( preg_match("/^.*?]].*$/sD", $next_line, $m) ) {
1262                                                         #if there's exactly one ]] that's fine, we'll keep looking
1263                                                         $text .= '[[' . $m[0];
1264                                                 } else {
1265                                                         #if $next_line is invalid too, we need look no further
1266                                                         $text .= '[[' . $next_line;
1267                                                         break;
1268                                                 }
1269                                         }
1270                                         if ( !$found ) {
1271                                                 # we couldn't find the end of this imageLink, so output it raw
1272                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1273                                                 $text = $this->replaceInternalLinks($text);
1274                                                 $s .= $prefix . '[[' . $link . '|' . $text;
1275                                                 # note: no $trail, because without an end, there *is* no trail
1276                                                 continue;
1277                                         }
1278                                 } else { #it's not an image, so output it raw
1279                                         $s .= $prefix . '[[' . $link . '|' . $text;
1280                                         # note: no $trail, because without an end, there *is* no trail
1281                                         continue;
1282                                 }
1283                         }
1284
1285                         $wasblank = ( '' == $text );
1286                         if( $wasblank ) $text = $link;
1287
1288
1289                         # Link not escaped by : , create the various objects
1290                         if( $noforce ) {
1291
1292                                 # Interwikis
1293                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1294                                         array_push( $this->mOutput->mLanguageLinks, $nt->getFullText() );
1295                                         $tmp = $prefix . $trail ;
1296                                         $s .= (trim($tmp) == '')? '': $tmp;
1297                                         continue;
1298                                 }
1299
1300                                 if ( $ns == NS_IMAGE ) {
1301                                         wfProfileIn( "$fname-image" );
1302
1303                                         # recursively parse links inside the image caption
1304                                         # actually, this will parse them in any other parameters, too,
1305                                         # but it might be hard to fix that, and it doesn't matter ATM
1306                                         $text = $this->replaceExternalLinks($text);
1307                                         $text = $this->replaceInternalLinks($text);
1308
1309                                         # replace the image with a link-holder so that replaceExternalLinks() can't mess with it
1310                                         $s .= $prefix . $this->insertStripItem( $sk->makeImageLinkObj( $nt, $text ), $this->mStripState ) . $trail;
1311                                         $wgLinkCache->addImageLinkObj( $nt );
1312
1313                                         wfProfileOut( "$fname-image" );
1314                                         continue;
1315                                 }
1316
1317                                 if ( $ns == NS_CATEGORY ) {
1318                                         wfProfileIn( "$fname-category" );
1319                                         $t = $nt->getText();
1320
1321                                         $wgLinkCache->suspend(); # Don't save in links/brokenlinks
1322                                         $pPLC=$sk->postParseLinkColour();
1323                                         $sk->postParseLinkColour( false );
1324                                         $t = $sk->makeLinkObj( $nt, $t, '', '' , $prefix );
1325                                         $sk->postParseLinkColour( $pPLC );
1326                                         $wgLinkCache->resume();
1327
1328                                         if ( $wasblank ) {
1329                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1330                                                         $sortkey = $this->mTitle->getText();
1331                                                 } else {
1332                                                         $sortkey = $this->mTitle->getPrefixedText();
1333                                                 }
1334                                         } else {
1335                                                 $sortkey = $text;
1336                                         }
1337                                         $wgLinkCache->addCategoryLinkObj( $nt, $sortkey );
1338                                         $this->mOutput->addCategoryLink( $t );
1339                                         $s .= $prefix . $trail ;
1340
1341                                         wfProfileOut( "$fname-category" );
1342                                         continue;
1343                                 }
1344                         }
1345
1346                         if( ( $nt->getPrefixedText() === $selflink ) &&
1347                             ( $nt->getFragment() === '' ) ) {
1348                                 # Self-links are handled specially; generally de-link and change to bold.
1349                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1350                                 continue;
1351                         }
1352
1353                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1354                         if( $ns == NS_MEDIA ) {
1355                                 $s .= $prefix . $sk->makeMediaLinkObj( $nt, $text, true ) . $trail;
1356                                 $wgLinkCache->addImageLinkObj( $nt );
1357                                 continue;
1358                         } elseif( $ns == NS_SPECIAL ) {
1359                                 $s .= $prefix . $sk->makeKnownLinkObj( $nt, $text, '', $trail );
1360                                 continue;
1361                         }
1362                         $s .= $sk->makeLinkObj( $nt, $text, '', $trail, $prefix );
1363                 }
1364                 $sk->postParseLinkColour( $saveParseColour );
1365                 wfProfileOut( $fname );
1366                 return $s;
1367         }
1368
1369         /**
1370          * Return true if subpage links should be expanded on this page.
1371          * @return bool
1372          */
1373         function areSubpagesAllowed() {
1374                 # Some namespaces don't allow subpages
1375                 global $wgNamespacesWithSubpages;
1376                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1377         }
1378
1379         /**
1380          * Handle link to subpage if necessary
1381          * @param string $target the source of the link
1382          * @param string &$text the link text, modified as necessary
1383          * @return string the full name of the link
1384          * @access private
1385          */
1386         function maybeDoSubpageLink($target, &$text) {
1387                 # Valid link forms:
1388                 # Foobar -- normal
1389                 # :Foobar -- override special treatment of prefix (images, language links)
1390                 # /Foobar -- convert to CurrentPage/Foobar
1391                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1392                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1393                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1394
1395                 $fname = 'Parser::maybeDoSubpageLink';
1396                 wfProfileIn( $fname );
1397                 $ret = $target; # default return value is no change
1398
1399                 # Some namespaces don't allow subpages,
1400                 # so only perform processing if subpages are allowed
1401                 if( $this->areSubpagesAllowed() ) {
1402                         # Look at the first character
1403                         if( $target != '' && $target{0} == '/' ) {
1404                                 # / at end means we don't want the slash to be shown
1405                                 if( substr( $target, -1, 1 ) == '/' ) {
1406                                         $target = substr( $target, 1, -1 );
1407                                         $noslash = $target;
1408                                 } else {
1409                                         $noslash = substr( $target, 1 );
1410                                 }
1411
1412                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1413                                 if( '' === $text ) {
1414                                         $text = $target;
1415                                 } # this might be changed for ugliness reasons
1416                         } else {
1417                                 # check for .. subpage backlinks
1418                                 $dotdotcount = 0;
1419                                 $nodotdot = $target;
1420                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1421                                         ++$dotdotcount;
1422                                         $nodotdot = substr( $nodotdot, 3 );
1423                                 }
1424                                 if($dotdotcount > 0) {
1425                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1426                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1427                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1428                                                 # / at the end means don't show full path
1429                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1430                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1431                                                         if( '' === $text ) {
1432                                                                 $text = $nodotdot;
1433                                                         }
1434                                                 }
1435                                                 $nodotdot = trim( $nodotdot );
1436                                                 if( $nodotdot != '' ) {
1437                                                         $ret .= '/' . $nodotdot;
1438                                                 }
1439                                         }
1440                                 }
1441                         }
1442                 }
1443
1444                 wfProfileOut( $fname );
1445                 return $ret;
1446         }
1447
1448         /**#@+
1449          * Used by doBlockLevels()
1450          * @access private
1451          */
1452         /* private */ function closeParagraph() {
1453                 $result = '';
1454                 if ( '' != $this->mLastSection ) {
1455                         $result = '</' . $this->mLastSection  . ">\n";
1456                 }
1457                 $this->mInPre = false;
1458                 $this->mLastSection = '';
1459                 return $result;
1460         }
1461         # getCommon() returns the length of the longest common substring
1462         # of both arguments, starting at the beginning of both.
1463         #
1464         /* private */ function getCommon( $st1, $st2 ) {
1465                 $fl = strlen( $st1 );
1466                 $shorter = strlen( $st2 );
1467                 if ( $fl < $shorter ) { $shorter = $fl; }
1468
1469                 for ( $i = 0; $i < $shorter; ++$i ) {
1470                         if ( $st1{$i} != $st2{$i} ) { break; }
1471                 }
1472                 return $i;
1473         }
1474         # These next three functions open, continue, and close the list
1475         # element appropriate to the prefix character passed into them.
1476         #
1477         /* private */ function openList( $char ) {
1478                 $result = $this->closeParagraph();
1479
1480                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1481                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1482                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1483                 else if ( ';' == $char ) {
1484                         $result .= '<dl><dt>';
1485                         $this->mDTopen = true;
1486                 }
1487                 else { $result = '<!-- ERR 1 -->'; }
1488
1489                 return $result;
1490         }
1491
1492         /* private */ function nextItem( $char ) {
1493                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1494                 else if ( ':' == $char || ';' == $char ) {
1495                         $close = '</dd>';
1496                         if ( $this->mDTopen ) { $close = '</dt>'; }
1497                         if ( ';' == $char ) {
1498                                 $this->mDTopen = true;
1499                                 return $close . '<dt>';
1500                         } else {
1501                                 $this->mDTopen = false;
1502                                 return $close . '<dd>';
1503                         }
1504                 }
1505                 return '<!-- ERR 2 -->';
1506         }
1507
1508         /* private */ function closeList( $char ) {
1509                 if ( '*' == $char ) { $text = '</li></ul>'; }
1510                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1511                 else if ( ':' == $char ) {
1512                         if ( $this->mDTopen ) {
1513                                 $this->mDTopen = false;
1514                                 $text = '</dt></dl>';
1515                         } else {
1516                                 $text = '</dd></dl>';
1517                         }
1518                 }
1519                 else {  return '<!-- ERR 3 -->'; }
1520                 return $text."\n";
1521         }
1522         /**#@-*/
1523
1524         /**
1525          * Make lists from lines starting with ':', '*', '#', etc.
1526          *
1527          * @access private
1528          * @return string the lists rendered as HTML
1529          */
1530         function doBlockLevels( $text, $linestart ) {
1531                 $fname = 'Parser::doBlockLevels';
1532                 wfProfileIn( $fname );
1533
1534                 # Parsing through the text line by line.  The main thing
1535                 # happening here is handling of block-level elements p, pre,
1536                 # and making lists from lines starting with * # : etc.
1537                 #
1538                 $textLines = explode( "\n", $text );
1539
1540                 $lastPrefix = $output = $lastLine = '';
1541                 $this->mDTopen = $inBlockElem = false;
1542                 $prefixLength = 0;
1543                 $paragraphStack = false;
1544
1545                 if ( !$linestart ) {
1546                         $output .= array_shift( $textLines );
1547                 }
1548                 foreach ( $textLines as $oLine ) {
1549                         $lastPrefixLength = strlen( $lastPrefix );
1550                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1551                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1552                         if ( !$this->mInPre ) {
1553                                 # Multiple prefixes may abut each other for nested lists.
1554                                 $prefixLength = strspn( $oLine, '*#:;' );
1555                                 $pref = substr( $oLine, 0, $prefixLength );
1556
1557                                 # eh?
1558                                 $pref2 = str_replace( ';', ':', $pref );
1559                                 $t = substr( $oLine, $prefixLength );
1560                                 $this->mInPre = !empty($preOpenMatch);
1561                         } else {
1562                                 # Don't interpret any other prefixes in preformatted text
1563                                 $prefixLength = 0;
1564                                 $pref = $pref2 = '';
1565                                 $t = $oLine;
1566                         }
1567
1568                         # List generation
1569                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1570                                 # Same as the last item, so no need to deal with nesting or opening stuff
1571                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1572                                 $paragraphStack = false;
1573
1574                                 if ( substr( $pref, -1 ) == ';') {
1575                                         # The one nasty exception: definition lists work like this:
1576                                         # ; title : definition text
1577                                         # So we check for : in the remainder text to split up the
1578                                         # title and definition, without b0rking links.
1579                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1580                                                 $t = $t2;
1581                                                 $output .= $term . $this->nextItem( ':' );
1582                                         }
1583                                 }
1584                         } elseif( $prefixLength || $lastPrefixLength ) {
1585                                 # Either open or close a level...
1586                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
1587                                 $paragraphStack = false;
1588
1589                                 while( $commonPrefixLength < $lastPrefixLength ) {
1590                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
1591                                         --$lastPrefixLength;
1592                                 }
1593                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
1594                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
1595                                 }
1596                                 while ( $prefixLength > $commonPrefixLength ) {
1597                                         $char = substr( $pref, $commonPrefixLength, 1 );
1598                                         $output .= $this->openList( $char );
1599
1600                                         if ( ';' == $char ) {
1601                                                 # FIXME: This is dupe of code above
1602                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1603                                                         $t = $t2;
1604                                                         $output .= $term . $this->nextItem( ':' );
1605                                                 }
1606                                         }
1607                                         ++$commonPrefixLength;
1608                                 }
1609                                 $lastPrefix = $pref2;
1610                         }
1611                         if( 0 == $prefixLength ) {
1612                                 wfProfileIn( "$fname-paragraph" );
1613                                 # No prefix (not in list)--go to paragraph mode
1614                                 $uniq_prefix = UNIQ_PREFIX;
1615                                 // XXX: use a stack for nestable elements like span, table and div
1616                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
1617                                 $closematch = preg_match(
1618                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
1619                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$uniq_prefix.'-pre|<\\/li|<\\/ul)/iS', $t );
1620                                 if ( $openmatch or $closematch ) {
1621                                         $paragraphStack = false;
1622                                         $output .= $this->closeParagraph();
1623                                         if($preOpenMatch and !$preCloseMatch) {
1624                                                 $this->mInPre = true;
1625                                         }
1626                                         if ( $closematch ) {
1627                                                 $inBlockElem = false;
1628                                         } else {
1629                                                 $inBlockElem = true;
1630                                         }
1631                                 } else if ( !$inBlockElem && !$this->mInPre ) {
1632                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
1633                                                 // pre
1634                                                 if ($this->mLastSection != 'pre') {
1635                                                         $paragraphStack = false;
1636                                                         $output .= $this->closeParagraph().'<pre>';
1637                                                         $this->mLastSection = 'pre';
1638                                                 }
1639                                                 $t = substr( $t, 1 );
1640                                         } else {
1641                                                 // paragraph
1642                                                 if ( '' == trim($t) ) {
1643                                                         if ( $paragraphStack ) {
1644                                                                 $output .= $paragraphStack.'<br />';
1645                                                                 $paragraphStack = false;
1646                                                                 $this->mLastSection = 'p';
1647                                                         } else {
1648                                                                 if ($this->mLastSection != 'p' ) {
1649                                                                         $output .= $this->closeParagraph();
1650                                                                         $this->mLastSection = '';
1651                                                                         $paragraphStack = '<p>';
1652                                                                 } else {
1653                                                                         $paragraphStack = '</p><p>';
1654                                                                 }
1655                                                         }
1656                                                 } else {
1657                                                         if ( $paragraphStack ) {
1658                                                                 $output .= $paragraphStack;
1659                                                                 $paragraphStack = false;
1660                                                                 $this->mLastSection = 'p';
1661                                                         } else if ($this->mLastSection != 'p') {
1662                                                                 $output .= $this->closeParagraph().'<p>';
1663                                                                 $this->mLastSection = 'p';
1664                                                         }
1665                                                 }
1666                                         }
1667                                 }
1668                                 wfProfileOut( "$fname-paragraph" );
1669                         }
1670                         if ($paragraphStack === false) {
1671                                 $output .= $t."\n";
1672                         }
1673                 }
1674                 while ( $prefixLength ) {
1675                         $output .= $this->closeList( $pref2{$prefixLength-1} );
1676                         --$prefixLength;
1677                 }
1678                 if ( '' != $this->mLastSection ) {
1679                         $output .= '</' . $this->mLastSection . '>';
1680                         $this->mLastSection = '';
1681                 }
1682
1683                 wfProfileOut( $fname );
1684                 return $output;
1685         }
1686
1687         /**
1688          * Split up a string on ':', ignoring any occurences inside
1689          * <a>..</a> or <span>...</span>
1690          * @param string $str the string to split
1691          * @param string &$before set to everything before the ':'
1692          * @param string &$after set to everything after the ':'
1693          * return string the position of the ':', or false if none found
1694          */
1695         function findColonNoLinks($str, &$before, &$after) {
1696                 # I wonder if we should make this count all tags, not just <a>
1697                 # and <span>. That would prevent us from matching a ':' that
1698                 # comes in the middle of italics other such formatting....
1699                 # -- Wil
1700                 $fname = 'Parser::findColonNoLinks';
1701                 wfProfileIn( $fname );
1702                 $pos = 0;
1703                 do {
1704                         $colon = strpos($str, ':', $pos);
1705
1706                         if ($colon !== false) {
1707                                 $before = substr($str, 0, $colon);
1708                                 $after = substr($str, $colon + 1);
1709
1710                                 # Skip any ':' within <a> or <span> pairs
1711                                 $a = substr_count($before, '<a');
1712                                 $s = substr_count($before, '<span');
1713                                 $ca = substr_count($before, '</a>');
1714                                 $cs = substr_count($before, '</span>');
1715
1716                                 if ($a <= $ca and $s <= $cs) {
1717                                         # Tags are balanced before ':'; ok
1718                                         break;
1719                                 }
1720                                 $pos = $colon + 1;
1721                         }
1722                 } while ($colon !== false);
1723                 wfProfileOut( $fname );
1724                 return $colon;
1725         }
1726
1727         /**
1728          * Return value of a magic variable (like PAGENAME)
1729          *
1730          * @access private
1731          */
1732         function getVariableValue( $index ) {
1733                 global $wgContLang, $wgSitename, $wgServer;
1734
1735                 /**
1736                  * Some of these require message or data lookups and can be
1737                  * expensive to check many times.
1738                  */
1739                 static $varCache = array();
1740                 if( isset( $varCache[$index] ) ) return $varCache[$index];
1741
1742                 switch ( $index ) {
1743                         case MAG_CURRENTMONTH:
1744                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm' ) );
1745                         case MAG_CURRENTMONTHNAME:
1746                                 return $varCache[$index] = $wgContLang->getMonthName( date('n') );
1747                         case MAG_CURRENTMONTHNAMEGEN:
1748                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date('n') );
1749                         case MAG_CURRENTDAY:
1750                                 return $varCache[$index] = $wgContLang->formatNum( date('j') );
1751                         case MAG_PAGENAME:
1752                                 return $this->mTitle->getText();
1753                         case MAG_PAGENAMEE:
1754                                 return $this->mTitle->getPartialURL();
1755                         case MAG_NAMESPACE:
1756                                 # return Namespace::getCanonicalName($this->mTitle->getNamespace());
1757                                 return $wgContLang->getNsText($this->mTitle->getNamespace()); # Patch by Dori
1758                         case MAG_CURRENTDAYNAME:
1759                                 return $varCache[$index] = $wgContLang->getWeekdayName( date('w')+1 );
1760                         case MAG_CURRENTYEAR:
1761                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y' ) );
1762                         case MAG_CURRENTTIME:
1763                                 return $varCache[$index] = $wgContLang->time( wfTimestampNow(), false );
1764                         case MAG_CURRENTWEEK:
1765                                 return $varCache[$index] = $wgContLang->formatNum( date('W') );
1766                         case MAG_CURRENTDOW:
1767                                 return $varCache[$index] = $wgContLang->formatNum( date('w') );
1768                         case MAG_NUMBEROFARTICLES:
1769                                 return $varCache[$index] = $wgContLang->formatNum( wfNumberOfArticles() );
1770                         case MAG_SITENAME:
1771                                 return $wgSitename;
1772                         case MAG_SERVER:
1773                                 return $wgServer;
1774                         default:
1775                                 return NULL;
1776                 }
1777         }
1778
1779         /**
1780          * initialise the magic variables (like CURRENTMONTHNAME)
1781          *
1782          * @access private
1783          */
1784         function initialiseVariables() {
1785                 $fname = 'Parser::initialiseVariables';
1786                 wfProfileIn( $fname );
1787                 global $wgVariableIDs;
1788                 $this->mVariables = array();
1789                 foreach ( $wgVariableIDs as $id ) {
1790                         $mw =& MagicWord::get( $id );
1791                         $mw->addToArray( $this->mVariables, $this->getVariableValue( $id ) );
1792                 }
1793                 wfProfileOut( $fname );
1794         }
1795
1796         /**
1797          * Replace magic variables, templates, and template arguments
1798          * with the appropriate text. Templates are substituted recursively,
1799          * taking care to avoid infinite loops.
1800          *
1801          * Note that the substitution depends on value of $mOutputType:
1802          *  OT_WIKI: only {{subst:}} templates
1803          *  OT_MSG: only magic variables
1804          *  OT_HTML: all templates and magic variables
1805          *
1806          * @param string $tex The text to transform
1807          * @param array $args Key-value pairs representing template parameters to substitute
1808          * @access private
1809          */
1810         function replaceVariables( $text, $args = array() ) {
1811                 global $wgLang, $wgScript, $wgArticlePath;
1812
1813                 # Prevent too big inclusions
1814                 if( strlen( $text ) > MAX_INCLUDE_SIZE ) {
1815                         return $text;
1816                 }
1817
1818                 $fname = 'Parser::replaceVariables';
1819                 wfProfileIn( $fname );
1820
1821                 $titleChars = Title::legalChars();
1822
1823                 # This function is called recursively. To keep track of arguments we need a stack:
1824                 array_push( $this->mArgStack, $args );
1825
1826                 # Variable substitution
1827                 $text = preg_replace_callback( "/{{([$titleChars]*?)}}/", array( &$this, 'variableSubstitution' ), $text );
1828
1829                 if ( $this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI ) {
1830                         # Argument substitution
1831                         $text = preg_replace_callback( "/{{{([$titleChars]*?)}}}/", array( &$this, 'argSubstitution' ), $text );
1832                 }
1833                 # Template substitution
1834                 $regex = '/(\\n|{)?{{(['.$titleChars.']*)(\\|.*?|)}}/s';
1835                 $text = preg_replace_callback( $regex, array( &$this, 'braceSubstitution' ), $text );
1836
1837                 array_pop( $this->mArgStack );
1838
1839                 wfProfileOut( $fname );
1840                 return $text;
1841         }
1842
1843         /**
1844          * Replace magic variables
1845          * @access private
1846          */
1847         function variableSubstitution( $matches ) {
1848                 $fname = 'parser::variableSubstitution';
1849                 wfProfileIn( $fname );
1850                 if ( !$this->mVariables ) {
1851                         $this->initialiseVariables();
1852                 }
1853                 $skip = false;
1854                 if ( $this->mOutputType == OT_WIKI ) {
1855                         # Do only magic variables prefixed by SUBST
1856                         $mwSubst =& MagicWord::get( MAG_SUBST );
1857                         if (!$mwSubst->matchStartAndRemove( $matches[1] ))
1858                                 $skip = true;
1859                         # Note that if we don't substitute the variable below,
1860                         # we don't remove the {{subst:}} magic word, in case
1861                         # it is a template rather than a magic variable.
1862                 }
1863                 if ( !$skip && array_key_exists( $matches[1], $this->mVariables ) ) {
1864                         $text = $this->mVariables[$matches[1]];
1865                         $this->mOutput->mContainsOldMagic = true;
1866                 } else {
1867                         $text = $matches[0];
1868                 }
1869                 wfProfileOut( $fname );
1870                 return $text;
1871         }
1872
1873         # Split template arguments
1874         function getTemplateArgs( $argsString ) {
1875                 if ( $argsString === '' ) {
1876                         return array();
1877                 }
1878
1879                 $args = explode( '|', substr( $argsString, 1 ) );
1880
1881                 # If any of the arguments contains a '[[' but no ']]', it needs to be
1882                 # merged with the next arg because the '|' character between belongs
1883                 # to the link syntax and not the template parameter syntax.
1884                 $argc = count($args);
1885                 $i = 0;
1886                 for ( $i = 0; $i < $argc-1; $i++ ) {
1887                         if ( substr_count ( $args[$i], '[[' ) != substr_count ( $args[$i], ']]' ) ) {
1888                                 $args[$i] .= '|'.$args[$i+1];
1889                                 array_splice($args, $i+1, 1);
1890                                 $i--;
1891                                 $argc--;
1892                         }
1893                 }
1894
1895                 return $args;
1896         }
1897
1898         /**
1899          * Return the text of a template, after recursively
1900          * replacing any variables or templates within the template.
1901          *
1902          * @param array $matches The parts of the template
1903          *  $matches[1]: the title, i.e. the part before the |
1904          *  $matches[2]: the parameters (including a leading |), if  any
1905          * @return string the text of the template
1906          * @access private
1907          */
1908         function braceSubstitution( $matches ) {
1909                 global $wgLinkCache, $wgContLang;
1910                 $fname = 'Parser::braceSubstitution';
1911                 wfProfileIn( $fname );
1912
1913                 $found = false;
1914                 $nowiki = false;
1915                 $noparse = false;
1916
1917                 $title = NULL;
1918
1919                 # Need to know if the template comes at the start of a line,
1920                 # to treat the beginning of the template like the beginning
1921                 # of a line for tables and block-level elements.
1922                 $linestart = $matches[1];
1923
1924                 # $part1 is the bit before the first |, and must contain only title characters
1925                 # $args is a list of arguments, starting from index 0, not including $part1
1926
1927                 $part1 = $matches[2];
1928                 # If the third subpattern matched anything, it will start with |
1929
1930                 $args = $this->getTemplateArgs($matches[3]);
1931                 $argc = count( $args );
1932
1933                 # Don't parse {{{}}} because that's only for template arguments
1934                 if ( $linestart === '{' ) {
1935                         $text = $matches[0];
1936                         $found = true;
1937                         $noparse = true;
1938                 }
1939
1940                 # SUBST
1941                 if ( !$found ) {
1942                         $mwSubst =& MagicWord::get( MAG_SUBST );
1943                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor ($this->mOutputType == OT_WIKI) ) {
1944                                 # One of two possibilities is true:
1945                                 # 1) Found SUBST but not in the PST phase
1946                                 # 2) Didn't find SUBST and in the PST phase
1947                                 # In either case, return without further processing
1948                                 $text = $matches[0];
1949                                 $found = true;
1950                                 $noparse = true;
1951                         }
1952                 }
1953
1954                 # MSG, MSGNW and INT
1955                 if ( !$found ) {
1956                         # Check for MSGNW:
1957                         $mwMsgnw =& MagicWord::get( MAG_MSGNW );
1958                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
1959                                 $nowiki = true;
1960                         } else {
1961                                 # Remove obsolete MSG:
1962                                 $mwMsg =& MagicWord::get( MAG_MSG );
1963                                 $mwMsg->matchStartAndRemove( $part1 );
1964                         }
1965
1966                         # Check if it is an internal message
1967                         $mwInt =& MagicWord::get( MAG_INT );
1968                         if ( $mwInt->matchStartAndRemove( $part1 ) ) {
1969                                 if ( $this->incrementIncludeCount( 'int:'.$part1 ) ) {
1970                                         $text = $linestart . wfMsgReal( $part1, $args, true );
1971                                         $found = true;
1972                                 }
1973                         }
1974                 }
1975
1976                 # NS
1977                 if ( !$found ) {
1978                         # Check for NS: (namespace expansion)
1979                         $mwNs = MagicWord::get( MAG_NS );
1980                         if ( $mwNs->matchStartAndRemove( $part1 ) ) {
1981                                 if ( intval( $part1 ) ) {
1982                                         $text = $linestart . $wgContLang->getNsText( intval( $part1 ) );
1983                                         $found = true;
1984                                 } else {
1985                                         $index = Namespace::getCanonicalIndex( strtolower( $part1 ) );
1986                                         if ( !is_null( $index ) ) {
1987                                                 $text = $linestart . $wgContLang->getNsText( $index );
1988                                                 $found = true;
1989                                         }
1990                                 }
1991                         }
1992                 }
1993
1994                 # LOCALURL and LOCALURLE
1995                 if ( !$found ) {
1996                         $mwLocal = MagicWord::get( MAG_LOCALURL );
1997                         $mwLocalE = MagicWord::get( MAG_LOCALURLE );
1998
1999                         if ( $mwLocal->matchStartAndRemove( $part1 ) ) {
2000                                 $func = 'getLocalURL';
2001                         } elseif ( $mwLocalE->matchStartAndRemove( $part1 ) ) {
2002                                 $func = 'escapeLocalURL';
2003                         } else {
2004                                 $func = '';
2005                         }
2006
2007                         if ( $func !== '' ) {
2008                                 $title = Title::newFromText( $part1 );
2009                                 if ( !is_null( $title ) ) {
2010                                         if ( $argc > 0 ) {
2011                                                 $text = $linestart . $title->$func( $args[0] );
2012                                         } else {
2013                                                 $text = $linestart . $title->$func();
2014                                         }
2015                                         $found = true;
2016                                 }
2017                         }
2018                 }
2019
2020                 # GRAMMAR
2021                 if ( !$found && $argc == 1 ) {
2022                         $mwGrammar =& MagicWord::get( MAG_GRAMMAR );
2023                         if ( $mwGrammar->matchStartAndRemove( $part1 ) ) {
2024                                 $text = $linestart . $wgContLang->convertGrammar( $args[0], $part1 );
2025                                 $found = true;
2026                         }
2027                 }
2028
2029                 # Template table test
2030
2031                 # Did we encounter this template already? If yes, it is in the cache
2032                 # and we need to check for loops.
2033                 if ( !$found && isset( $this->mTemplates[$part1] ) ) {
2034                         # set $text to cached message.
2035                         $text = $linestart . $this->mTemplates[$part1];
2036                         $found = true;
2037
2038                         # Infinite loop test
2039                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2040                                 $noparse = true;
2041                                 $found = true;
2042                                 $text .= '<!-- WARNING: template loop detected -->';
2043                         }
2044                 }
2045
2046                 # Load from database
2047                 $itcamefromthedatabase = false;
2048                 if ( !$found ) {
2049                         $ns = NS_TEMPLATE;
2050                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage='' );
2051                         if ($subpage !== '') {
2052                                 $ns = $this->mTitle->getNamespace();
2053                         }
2054                         $title = Title::newFromText( $part1, $ns );
2055                         if ( !is_null( $title ) && !$title->isExternal() ) {
2056                                 # Check for excessive inclusion
2057                                 $dbk = $title->getPrefixedDBkey();
2058                                 if ( $this->incrementIncludeCount( $dbk ) ) {
2059                                         # This should never be reached.
2060                                         $article = new Article( $title );
2061                                         $articleContent = $article->getContentWithoutUsingSoManyDamnGlobals();
2062                                         if ( $articleContent !== false ) {
2063                                                 $found = true;
2064                                                 $text = $linestart . $articleContent;
2065                                                 $itcamefromthedatabase = true;
2066                                         }
2067                                 }
2068
2069                                 # If the title is valid but undisplayable, make a link to it
2070                                 if ( $this->mOutputType == OT_HTML && !$found ) {
2071                                         $text = $linestart . '[['.$title->getPrefixedText().']]';
2072                                         $found = true;
2073                                 }
2074
2075                                 # Template cache array insertion
2076                                 $this->mTemplates[$part1] = $text;
2077                         }
2078                 }
2079
2080                 # Recursive parsing, escaping and link table handling
2081                 # Only for HTML output
2082                 if ( $nowiki && $found && $this->mOutputType == OT_HTML ) {
2083                         $text = wfEscapeWikiText( $text );
2084                 } elseif ( ($this->mOutputType == OT_HTML || $this->mOutputType == OT_WIKI) && $found && !$noparse) {
2085                         # Clean up argument array
2086                         $assocArgs = array();
2087                         $index = 1;
2088                         foreach( $args as $arg ) {
2089                                 $eqpos = strpos( $arg, '=' );
2090                                 if ( $eqpos === false ) {
2091                                         $assocArgs[$index++] = $arg;
2092                                 } else {
2093                                         $name = trim( substr( $arg, 0, $eqpos ) );
2094                                         $value = trim( substr( $arg, $eqpos+1 ) );
2095                                         if ( $value === false ) {
2096                                                 $value = '';
2097                                         }
2098                                         if ( $name !== false ) {
2099                                                 $assocArgs[$name] = $value;
2100                                         }
2101                                 }
2102                         }
2103
2104                         # Add a new element to the templace recursion path
2105                         $this->mTemplatePath[$part1] = 1;
2106
2107                         $text = $this->strip( $text, $this->mStripState );
2108                         $text = $this->removeHTMLtags( $text );
2109                         $text = $this->replaceVariables( $text, $assocArgs );
2110
2111                         # Resume the link cache and register the inclusion as a link
2112                         if ( $this->mOutputType == OT_HTML && !is_null( $title ) ) {
2113                                 $wgLinkCache->addLinkObj( $title );
2114                         }
2115
2116                         # If the template begins with a table or block-level
2117                         # element, it should be treated as beginning a new line.
2118                         if ($linestart !== '\n' && preg_match('/^({\\||:|;|#|\*)/', $text)) {
2119                                 $text = "\n" . $text;
2120                         }
2121                 }
2122
2123                 # Empties the template path
2124                 $this->mTemplatePath = array();
2125                 if ( !$found ) {
2126                         wfProfileOut( $fname );
2127                         return $matches[0];
2128                 } else {
2129                         # replace ==section headers==
2130                         # XXX this needs to go away once we have a better parser.
2131                         if ( $this->mOutputType != OT_WIKI && $itcamefromthedatabase ) {
2132                                 if( !is_null( $title ) )
2133                                         $encodedname = base64_encode($title->getPrefixedDBkey());
2134                                 else
2135                                         $encodedname = base64_encode("");
2136                                 $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
2137                                         PREG_SPLIT_DELIM_CAPTURE);
2138                                 $text = '';
2139                                 $nsec = 0;
2140                                 for( $i = 0; $i < count($m); $i += 2 ) {
2141                                         $text .= $m[$i];
2142                                         if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
2143                                         $hl = $m[$i + 1];
2144                                         if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
2145                                                 $text .= $hl;
2146                                                 continue;
2147                                         }
2148                                         preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
2149                                         $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
2150                                                 . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
2151
2152                                         $nsec++;
2153                                 }
2154                         }
2155                 }
2156
2157                 # Empties the template path
2158                 $this->mTemplatePath = array();
2159
2160                 if ( !$found ) {
2161                         wfProfileOut( $fname );
2162                         return $matches[0];
2163                 } else {
2164                         wfProfileOut( $fname );
2165                         return $text;
2166                 }
2167         }
2168
2169         /**
2170          * Triple brace replacement -- used for template arguments
2171          * @access private
2172          */
2173         function argSubstitution( $matches ) {
2174                 $arg = trim( $matches[1] );
2175                 $text = $matches[0];
2176                 $inputArgs = end( $this->mArgStack );
2177
2178                 if ( array_key_exists( $arg, $inputArgs ) ) {
2179                         $text = $inputArgs[$arg];
2180                 }
2181
2182                 return $text;
2183         }
2184
2185         /**
2186          * Returns true if the function is allowed to include this entity
2187          * @access private
2188          */
2189         function incrementIncludeCount( $dbk ) {
2190                 if ( !array_key_exists( $dbk, $this->mIncludeCount ) ) {
2191                         $this->mIncludeCount[$dbk] = 0;
2192                 }
2193                 if ( ++$this->mIncludeCount[$dbk] <= MAX_INCLUDE_REPEAT ) {
2194                         return true;
2195                 } else {
2196                         return false;
2197                 }
2198         }
2199
2200
2201         /**
2202          * Cleans up HTML, removes dangerous tags and attributes, and
2203          * removes HTML comments
2204          * @access private
2205          */
2206         function removeHTMLtags( $text ) {
2207                 global $wgUseTidy, $wgUserHtml;
2208                 $fname = 'Parser::removeHTMLtags';
2209                 wfProfileIn( $fname );
2210
2211                 if( $wgUserHtml ) {
2212                         $htmlpairs = array( # Tags that must be closed
2213                                 'b', 'del', 'i', 'ins', 'u', 'font', 'big', 'small', 'sub', 'sup', 'h1',
2214                                 'h2', 'h3', 'h4', 'h5', 'h6', 'cite', 'code', 'em', 's',
2215                                 'strike', 'strong', 'tt', 'var', 'div', 'center',
2216                                 'blockquote', 'ol', 'ul', 'dl', 'table', 'caption', 'pre',
2217                                 'ruby', 'rt' , 'rb' , 'rp', 'p', 'span'
2218                         );
2219                         $htmlsingle = array(
2220                                 'br', 'hr', 'li', 'dt', 'dd'
2221                         );
2222                         $htmlnest = array( # Tags that can be nested--??
2223                                 'table', 'tr', 'td', 'th', 'div', 'blockquote', 'ol', 'ul',
2224                                 'dl', 'font', 'big', 'small', 'sub', 'sup', 'span'
2225                         );
2226                         $tabletags = array( # Can only appear inside table
2227                                 'td', 'th', 'tr'
2228                         );
2229                 } else {
2230                         $htmlpairs = array();
2231                         $htmlsingle = array();
2232                         $htmlnest = array();
2233                         $tabletags = array();
2234                 }
2235
2236                 $htmlsingle = array_merge( $tabletags, $htmlsingle );
2237                 $htmlelements = array_merge( $htmlsingle, $htmlpairs );
2238
2239                 $htmlattrs = $this->getHTMLattrs () ;
2240
2241                 # Remove HTML comments
2242                 $text = $this->removeHTMLcomments( $text );
2243
2244                 $bits = explode( '<', $text );
2245                 $text = array_shift( $bits );
2246                 if(!$wgUseTidy) {
2247                         $tagstack = array(); $tablestack = array();
2248                         foreach ( $bits as $x ) {
2249                                 $prev = error_reporting( E_ALL & ~( E_NOTICE | E_WARNING ) );
2250                                 preg_match( '/^(\\/?)(\\w+)([^>]*)(\\/{0,1}>)([^<]*)$/',
2251                                 $x, $regs );
2252                                 list( $qbar, $slash, $t, $params, $brace, $rest ) = $regs;
2253                                 error_reporting( $prev );
2254
2255                                 $badtag = 0 ;
2256                                 if ( in_array( $t = strtolower( $t ), $htmlelements ) ) {
2257                                         # Check our stack
2258                                         if ( $slash ) {
2259                                                 # Closing a tag...
2260                                                 if ( ! in_array( $t, $htmlsingle ) &&
2261                                                 ( $ot = @array_pop( $tagstack ) ) != $t ) {
2262                                                         @array_push( $tagstack, $ot );
2263                                                         $badtag = 1;
2264                                                 } else {
2265                                                         if ( $t == 'table' ) {
2266                                                                 $tagstack = array_pop( $tablestack );
2267                                                         }
2268                                                         $newparams = '';
2269                                                 }
2270                                         } else {
2271                                                 # Keep track for later
2272                                                 if ( in_array( $t, $tabletags ) &&
2273                                                 ! in_array( 'table', $tagstack ) ) {
2274                                                         $badtag = 1;
2275                                                 } else if ( in_array( $t, $tagstack ) &&
2276                                                 ! in_array ( $t , $htmlnest ) ) {
2277                                                         $badtag = 1 ;
2278                                                 } else if ( ! in_array( $t, $htmlsingle ) ) {
2279                                                         if ( $t == 'table' ) {
2280                                                                 array_push( $tablestack, $tagstack );
2281                                                                 $tagstack = array();
2282                                                         }
2283                                                         array_push( $tagstack, $t );
2284                                                 }
2285                                                 # Strip non-approved attributes from the tag
2286                                                 $newparams = $this->fixTagAttributes($params);
2287
2288                                         }
2289                                         if ( ! $badtag ) {
2290                                                 $rest = str_replace( '>', '&gt;', $rest );
2291                                                 $text .= "<$slash$t $newparams$brace$rest";
2292                                                 continue;
2293                                         }
2294                                 }
2295                                 $text .= '&lt;' . str_replace( '>', '&gt;', $x);
2296                         }
2297                         # Close off any remaining tags
2298                         while ( is_array( $tagstack ) && ($t = array_pop( $tagstack )) ) {
2299                                 $text .= "</$t>\n";
2300                                 if ( $t == 'table' ) { $tagstack = array_pop( $tablestack ); }
2301                         }
2302                 } else {
2303                         # this might be possible using tidy itself
2304                         foreach ( $bits as $x ) {
2305                                 preg_match( '/^(\\/?)(\\w+)([^>]*)(\\/{0,1}>)([^<]*)$/',
2306                                 $x, $regs );
2307                                 @list( $qbar, $slash, $t, $params, $brace, $rest ) = $regs;
2308                                 if ( in_array( $t = strtolower( $t ), $htmlelements ) ) {
2309                                         $newparams = $this->fixTagAttributes($params);
2310                                         $rest = str_replace( '>', '&gt;', $rest );
2311                                         $text .= "<$slash$t $newparams$brace$rest";
2312                                 } else {
2313                                         $text .= '&lt;' . str_replace( '>', '&gt;', $x);
2314                                 }
2315                         }
2316                 }
2317                 wfProfileOut( $fname );
2318                 return $text;
2319         }
2320
2321         /**
2322          * Remove '<!--', '-->', and everything between.
2323          * To avoid leaving blank lines, when a comment is both preceded
2324          * and followed by a newline (ignoring spaces), trim leading and
2325          * trailing spaces and one of the newlines.
2326          *
2327          * @access private
2328          */
2329         function removeHTMLcomments( $text ) {
2330                 $fname='Parser::removeHTMLcomments';
2331                 wfProfileIn( $fname );
2332                 while (($start = strpos($text, '<!--')) !== false) {
2333                         $end = strpos($text, '-->', $start + 4);
2334                         if ($end === false) {
2335                                 # Unterminated comment; bail out
2336                                 break;
2337                         }
2338
2339                         $end += 3;
2340
2341                         # Trim space and newline if the comment is both
2342                         # preceded and followed by a newline
2343                         $spaceStart = max($start - 1, 0);
2344                         $spaceLen = $end - $spaceStart;
2345                         while (substr($text, $spaceStart, 1) === ' ' && $spaceStart > 0) {
2346                                 $spaceStart--;
2347                                 $spaceLen++;
2348                         }
2349                         while (substr($text, $spaceStart + $spaceLen, 1) === ' ')
2350                                 $spaceLen++;
2351                         if (substr($text, $spaceStart, 1) === "\n" and substr($text, $spaceStart + $spaceLen, 1) === "\n") {
2352                                 # Remove the comment, leading and trailing
2353                                 # spaces, and leave only one newline.
2354                                 $text = substr_replace($text, "\n", $spaceStart, $spaceLen + 1);
2355                         }
2356                         else {
2357                                 # Remove just the comment.
2358                                 $text = substr_replace($text, '', $start, $end - $start);
2359                         }
2360                 }
2361                 wfProfileOut( $fname );
2362                 return $text;
2363         }
2364
2365         /**
2366          * This function accomplishes several tasks:
2367          * 1) Auto-number headings if that option is enabled
2368          * 2) Add an [edit] link to sections for logged in users who have enabled the option
2369          * 3) Add a Table of contents on the top for users who have enabled the option
2370          * 4) Auto-anchor headings
2371          *
2372          * It loops through all headlines, collects the necessary data, then splits up the
2373          * string and re-inserts the newly formatted headlines.
2374          * @access private
2375          */
2376         /* private */ function formatHeadings( $text, $isMain=true ) {
2377                 global $wgInputEncoding, $wgMaxTocLevel, $wgContLang, $wgLinkHolders;
2378
2379                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
2380                 $doShowToc = $this->mOptions->getShowToc();
2381                 $forceTocHere = false;
2382                 if( !$this->mTitle->userCanEdit() ) {
2383                         $showEditLink = 0;
2384                         $rightClickHack = 0;
2385                 } else {
2386                         $showEditLink = $this->mOptions->getEditSection();
2387                         $rightClickHack = $this->mOptions->getEditSectionOnRightClick();
2388                 }
2389
2390                 # Inhibit editsection links if requested in the page
2391                 $esw =& MagicWord::get( MAG_NOEDITSECTION );
2392                 if( $esw->matchAndRemove( $text ) ) {
2393                         $showEditLink = 0;
2394                 }
2395                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
2396                 # do not add TOC
2397                 $mw =& MagicWord::get( MAG_NOTOC );
2398                 if( $mw->matchAndRemove( $text ) ) {
2399                         $doShowToc = 0;
2400                 }
2401
2402                 # never add the TOC to the Main Page. This is an entry page that should not
2403                 # be more than 1-2 screens large anyway
2404                 if( $this->mTitle->getPrefixedText() == wfMsg('mainpage') ) {
2405                         $doShowToc = 0;
2406                 }
2407
2408                 # Get all headlines for numbering them and adding funky stuff like [edit]
2409                 # links - this is for later, but we need the number of headlines right now
2410                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
2411
2412                 # if there are fewer than 4 headlines in the article, do not show TOC
2413                 if( $numMatches < 4 ) {
2414                         $doShowToc = 0;
2415                 }
2416
2417                 # if the string __TOC__ (not case-sensitive) occurs in the HTML,
2418                 # override above conditions and always show TOC at that place
2419
2420                 $mw =& MagicWord::get( MAG_TOC );
2421                 if($mw->match( $text ) ) {
2422                         $doShowToc = 1;
2423                         $forceTocHere = true;
2424                 } else {
2425                         # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
2426                         # override above conditions and always show TOC above first header
2427                         $mw =& MagicWord::get( MAG_FORCETOC );
2428                         if ($mw->matchAndRemove( $text ) ) {
2429                                 $doShowToc = 1;
2430                         }
2431                 }
2432
2433                 # Never ever show TOC if no headers
2434                 if( $numMatches < 1 ) {
2435                         $doShowToc = 0;
2436                 }
2437
2438                 # We need this to perform operations on the HTML
2439                 $sk =& $this->mOptions->getSkin();
2440
2441                 # headline counter
2442                 $headlineCount = 0;
2443                 $sectionCount = 0; # headlineCount excluding template sections
2444
2445                 # Ugh .. the TOC should have neat indentation levels which can be
2446                 # passed to the skin functions. These are determined here
2447                 $toc = '';
2448                 $full = '';
2449                 $head = array();
2450                 $sublevelCount = array();
2451                 $levelCount = array();
2452                 $toclevel = 0;
2453                 $level = 0;
2454                 $prevlevel = 0;
2455                 $toclevel = 0;
2456                 $prevtoclevel = 0;
2457
2458                 foreach( $matches[3] as $headline ) {
2459                         $istemplate = 0;
2460                         $templatetitle = '';
2461                         $templatesection = 0;
2462                         $numbering = '';
2463
2464                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
2465                                 $istemplate = 1;
2466                                 $templatetitle = base64_decode($mat[1]);
2467                                 $templatesection = 1 + (int)base64_decode($mat[2]);
2468                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
2469                         }
2470
2471                         if( $toclevel ) {
2472                                 $prevlevel = $level;
2473                                 $prevtoclevel = $toclevel;
2474                         }
2475                         $level = $matches[1][$headlineCount];
2476
2477                         if( $doNumberHeadings || $doShowToc ) {
2478
2479                                 if ( $level > $prevlevel ) {
2480                                         # Increase TOC level
2481                                         $toclevel++;
2482                                         $sublevelCount[$toclevel] = 0;
2483                                         $toc .= $sk->tocIndent();
2484                                 }
2485                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
2486                                         # Decrease TOC level, find level to jump to
2487
2488                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
2489                                                 # Can only go down to level 1
2490                                                 $toclevel = 1;
2491                                         } else {
2492                                                 for ($i = $toclevel; $i > 0; $i--) {
2493                                                         if ( $levelCount[$i] == $level ) {
2494                                                                 # Found last matching level
2495                                                                 $toclevel = $i;
2496                                                                 break;
2497                                                         }
2498                                                         elseif ( $levelCount[$i] < $level ) {
2499                                                                 # Found first matching level below current level
2500                                                                 $toclevel = $i + 1;
2501                                                                 break;
2502                                                         }
2503                                                 }
2504                                         }
2505
2506                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
2507                                 }
2508                                 else {
2509                                         # No change in level, end TOC line
2510                                         $toc .= $sk->tocLineEnd();
2511                                 }
2512
2513                                 $levelCount[$toclevel] = $level;
2514
2515                                 # count number of headlines for each level
2516                                 @$sublevelCount[$toclevel]++;
2517                                 $dot = 0;
2518                                 for( $i = 1; $i <= $toclevel; $i++ ) {
2519                                         if( !empty( $sublevelCount[$i] ) ) {
2520                                                 if( $dot ) {
2521                                                         $numbering .= '.';
2522                                                 }
2523                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
2524                                                 $dot = 1;
2525                                         }
2526                                 }
2527                         }
2528
2529                         # The canonized header is a version of the header text safe to use for links
2530                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
2531                         $canonized_headline = $this->unstrip( $headline, $this->mStripState );
2532                         $canonized_headline = $this->unstripNoWiki( $headline, $this->mStripState );
2533
2534                         # Remove link placeholders by the link text.
2535                         #     <!--LINK number-->
2536                         # turns into
2537                         #     link text with suffix
2538                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
2539                                                             "\$wgLinkHolders['texts'][\$1]",
2540                                                             $canonized_headline );
2541
2542                         # strip out HTML
2543                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
2544                         $tocline = trim( $canonized_headline );
2545                         $canonized_headline = urlencode( do_html_entity_decode( str_replace(' ', '_', $tocline), ENT_COMPAT, $wgInputEncoding ) );
2546                         $replacearray = array(
2547                                 '%3A' => ':',
2548                                 '%' => '.'
2549                         );
2550                         $canonized_headline = str_replace(array_keys($replacearray),array_values($replacearray),$canonized_headline);
2551                         $refer[$headlineCount] = $canonized_headline;
2552
2553                         # count how many in assoc. array so we can track dupes in anchors
2554                         @$refers[$canonized_headline]++;
2555                         $refcount[$headlineCount]=$refers[$canonized_headline];
2556
2557                         # Don't number the heading if it is the only one (looks silly)
2558                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
2559                                 # the two are different if the line contains a link
2560                                 $headline=$numbering . ' ' . $headline;
2561                         }
2562
2563                         # Create the anchor for linking from the TOC to the section
2564                         $anchor = $canonized_headline;
2565                         if($refcount[$headlineCount] > 1 ) {
2566                                 $anchor .= '_' . $refcount[$headlineCount];
2567                         }
2568                         if( $doShowToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
2569                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
2570                         }
2571                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
2572                                 if ( empty( $head[$headlineCount] ) ) {
2573                                         $head[$headlineCount] = '';
2574                                 }
2575                                 if( $istemplate )
2576                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
2577                                 else
2578                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1);
2579                         }
2580
2581                         # Add the edit section span
2582                         if( $rightClickHack ) {
2583                                 if( $istemplate )
2584                                         $headline = $sk->editSectionScriptForOther($templatetitle, $templatesection, $headline);
2585                                 else
2586                                         $headline = $sk->editSectionScript($this->mTitle, $sectionCount+1,$headline);
2587                         }
2588
2589                         # give headline the correct <h#> tag
2590                         @$head[$headlineCount] .= "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount] .$headline.'</h'.$level.'>';
2591
2592                         $headlineCount++;
2593                         if( !$istemplate )
2594                                 $sectionCount++;
2595                 }
2596
2597                 if( $doShowToc ) {
2598                         $toclines = $headlineCount;
2599                         $toc .= $sk->tocUnindent( $toclevel - 1 );
2600                         $toc = $sk->tocList( $toc );
2601                 }
2602
2603                 # split up and insert constructed headlines
2604
2605                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
2606                 $i = 0;
2607
2608                 foreach( $blocks as $block ) {
2609                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
2610                                 # This is the [edit] link that appears for the top block of text when
2611                                 # section editing is enabled
2612
2613                                 # Disabled because it broke block formatting
2614                                 # For example, a bullet point in the top line
2615                                 # $full .= $sk->editSectionLink(0);
2616                         }
2617                         $full .= $block;
2618                         if( $doShowToc && !$i && $isMain && !$forceTocHere) {
2619                         # Top anchor now in skin
2620                                 $full = $full.$toc;
2621                         }
2622
2623                         if( !empty( $head[$i] ) ) {
2624                                 $full .= $head[$i];
2625                         }
2626                         $i++;
2627                 }
2628                 if($forceTocHere) {
2629                         $mw =& MagicWord::get( MAG_TOC );
2630                         return $mw->replace( $toc, $full );
2631                 } else {
2632                         return $full;
2633                 }
2634         }
2635
2636         /**
2637          * Return an HTML link for the "ISBN 123456" text
2638          * @access private
2639          */
2640         function magicISBN( $text ) {
2641                 global $wgLang;
2642                 $fname = 'Parser::magicISBN';
2643                 wfProfileIn( $fname );
2644
2645                 $a = split( 'ISBN ', ' '.$text );
2646                 if ( count ( $a ) < 2 ) {
2647                         wfProfileOut( $fname );
2648                         return $text;
2649                 }
2650                 $text = substr( array_shift( $a ), 1);
2651                 $valid = '0123456789-ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2652
2653                 foreach ( $a as $x ) {
2654                         $isbn = $blank = '' ;
2655                         while ( ' ' == $x{0} ) {
2656                                 $blank .= ' ';
2657                                 $x = substr( $x, 1 );
2658                         }
2659                         if ( $x == '' ) { # blank isbn
2660                                 $text .= "ISBN $blank";
2661                                 continue;
2662                         }
2663                         while ( strstr( $valid, $x{0} ) != false ) {
2664                                 $isbn .= $x{0};
2665                                 $x = substr( $x, 1 );
2666                         }
2667                         $num = str_replace( '-', '', $isbn );
2668                         $num = str_replace( ' ', '', $num );
2669
2670                         if ( '' == $num ) {
2671                                 $text .= "ISBN $blank$x";
2672                         } else {
2673                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Booksources' );
2674                                 $text .= '<a href="' .
2675                                 $titleObj->escapeLocalUrl( 'isbn='.$num ) .
2676                                         "\" class=\"internal\">ISBN $isbn</a>";
2677                                 $text .= $x;
2678                         }
2679                 }
2680                 wfProfileOut( $fname );
2681                 return $text;
2682         }
2683
2684         /**
2685          * Return an HTML link for the "GEO ..." text
2686          * @access private
2687          */
2688         function magicGEO( $text ) {
2689                 global $wgLang, $wgUseGeoMode;
2690                 $fname = 'Parser::magicGEO';
2691                 wfProfileIn( $fname );
2692
2693                 # These next five lines are only for the ~35000 U.S. Census Rambot pages...
2694                 $directions = array ( 'N' => 'North' , 'S' => 'South' , 'E' => 'East' , 'W' => 'West' ) ;
2695                 $text = preg_replace ( "/(\d+)&deg;(\d+)'(\d+)\" {$directions['N']}, (\d+)&deg;(\d+)'(\d+)\" {$directions['W']}/" , "(GEO +\$1.\$2.\$3:-\$4.\$5.\$6)" , $text ) ;
2696                 $text = preg_replace ( "/(\d+)&deg;(\d+)'(\d+)\" {$directions['N']}, (\d+)&deg;(\d+)'(\d+)\" {$directions['E']}/" , "(GEO +\$1.\$2.\$3:+\$4.\$5.\$6)" , $text ) ;
2697                 $text = preg_replace ( "/(\d+)&deg;(\d+)'(\d+)\" {$directions['S']}, (\d+)&deg;(\d+)'(\d+)\" {$directions['W']}/" , "(GEO +\$1.\$2.\$3:-\$4.\$5.\$6)" , $text ) ;
2698                 $text = preg_replace ( "/(\d+)&deg;(\d+)'(\d+)\" {$directions['S']}, (\d+)&deg;(\d+)'(\d+)\" {$directions['E']}/" , "(GEO +\$1.\$2.\$3:+\$4.\$5.\$6)" , $text ) ;
2699
2700                 $a = split( 'GEO ', ' '.$text );
2701                 if ( count ( $a ) < 2 ) {
2702                         wfProfileOut( $fname );
2703                         return $text;
2704                 }
2705                 $text = substr( array_shift( $a ), 1);
2706                 $valid = '0123456789.+-:';
2707
2708                 foreach ( $a as $x ) {
2709                         $geo = $blank = '' ;
2710                         while ( ' ' == $x{0} ) {
2711                                 $blank .= ' ';
2712                                 $x = substr( $x, 1 );
2713                         }
2714                         while ( strstr( $valid, $x{0} ) != false ) {
2715                                 $geo .= $x{0};
2716                                 $x = substr( $x, 1 );
2717                         }
2718                         $num = str_replace( '+', '', $geo );
2719                         $num = str_replace( ' ', '', $num );
2720
2721                         if ( '' == $num || count ( explode ( ':' , $num , 3 ) ) < 2 ) {
2722                                 $text .= "GEO $blank$x";
2723                         } else {
2724                                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Geo' );
2725                                 $text .= '<a href="' .
2726                                 $titleObj->escapeLocalUrl( 'coordinates='.$num ) .
2727                                         "\" class=\"internal\">GEO $geo</a>";
2728                                 $text .= $x;
2729                         }
2730                 }
2731                 wfProfileOut( $fname );
2732                 return $text;
2733         }
2734
2735         /**
2736          * Return an HTML link for the "RFC 1234" text
2737          * @access private
2738          * @param string $text text to be processed
2739          */
2740         function magicRFC( $text, $keyword='RFC ', $urlmsg='rfcurl'  ) {
2741                 global $wgLang;
2742
2743                 $valid = '0123456789';
2744                 $internal = false;
2745
2746                 $a = split( $keyword, ' '.$text );
2747                 if ( count ( $a ) < 2 ) {
2748                         return $text;
2749                 }
2750                 $text = substr( array_shift( $a ), 1);
2751
2752                 /* Check if keyword is preceed by [[.
2753                  * This test is made here cause of the array_shift above
2754                  * that prevent the test to be done in the foreach.
2755                  */
2756                 if ( substr( $text, -2 ) == '[[' ) {
2757                         $internal = true;
2758                 }
2759
2760                 foreach ( $a as $x ) {
2761                         /* token might be empty if we have RFC RFC 1234 */
2762                         if ( $x=='' ) {
2763                                 $text.=$keyword;
2764                                 continue;
2765                                 }
2766
2767                         $id = $blank = '' ;
2768
2769                         /** remove and save whitespaces in $blank */
2770                         while ( $x{0} == ' ' ) {
2771                                 $blank .= ' ';
2772                                 $x = substr( $x, 1 );
2773                         }
2774
2775                         /** remove and save the rfc number in $id */
2776                         while ( strstr( $valid, $x{0} ) != false ) {
2777                                 $id .= $x{0};
2778                                 $x = substr( $x, 1 );
2779                         }
2780
2781                         if ( $id == '' ) {
2782                                 /* call back stripped spaces*/
2783                                 $text .= $keyword.$blank.$x;
2784                         } elseif( $internal ) {
2785                                 /* normal link */
2786                                 $text .= $keyword.$id.$x;
2787                         } else {
2788                                 /* build the external link*/
2789                                 $url = wfmsg( $urlmsg );
2790                                 $url = str_replace( '$1', $id, $url);
2791                                 $sk =& $this->mOptions->getSkin();
2792                                 $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
2793                                 $text .= "<a href='{$url}'{$la}>{$keyword}{$id}</a>{$x}";
2794                         }
2795
2796                         /* Check if the next RFC keyword is preceed by [[ */
2797                         $internal = ( substr($x,-2) == '[[' );
2798                 }
2799                 return $text;
2800         }
2801
2802         /**
2803          * Transform wiki markup when saving a page by doing \r\n -> \n
2804          * conversion, substitting signatures, {{subst:}} templates, etc.
2805          *
2806          * @param string $text the text to transform
2807          * @param Title &$title the Title object for the current article
2808          * @param User &$user the User object describing the current user
2809          * @param ParserOptions $options parsing options
2810          * @param bool $clearState whether to clear the parser state first
2811          * @return string the altered wiki markup
2812          * @access public
2813          */
2814         function preSaveTransform( $text, &$title, &$user, $options, $clearState = true ) {
2815                 $this->mOptions = $options;
2816                 $this->mTitle =& $title;
2817                 $this->mOutputType = OT_WIKI;
2818
2819                 if ( $clearState ) {
2820                         $this->clearState();
2821                 }
2822
2823                 $stripState = false;
2824                 $pairs = array(
2825                         "\r\n" => "\n",
2826                         );
2827                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
2828                 $text = $this->strip( $text, $stripState, false );
2829                 $text = $this->pstPass2( $text, $user );
2830                 $text = $this->unstrip( $text, $stripState );
2831                 $text = $this->unstripNoWiki( $text, $stripState );
2832                 return $text;
2833         }
2834
2835         /**
2836          * Pre-save transform helper function
2837          * @access private
2838          */
2839         function pstPass2( $text, &$user ) {
2840                 global $wgLang, $wgContLang, $wgLocaltimezone;
2841
2842                 # Variable replacement
2843                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
2844                 $text = $this->replaceVariables( $text );
2845
2846                 # Signatures
2847                 #
2848                 $n = $user->getName();
2849                 $k = $user->getOption( 'nickname' );
2850                 if ( '' == $k ) { $k = $n; }
2851                 if ( isset( $wgLocaltimezone ) ) {
2852                         $oldtz = getenv( 'TZ' );
2853                         putenv( 'TZ='.$wgLocaltimezone );
2854                 }
2855                 /* Note: this is an ugly timezone hack for the European wikis */
2856                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false ) .
2857                   ' (' . date( 'T' ) . ')';
2858                 if ( isset( $wgLocaltimezone ) ) {
2859                         putenv( 'TZ='.$oldtzs );
2860                 }
2861
2862                 if( $user->getOption( 'fancysig' ) ) {
2863                         $sigText = $k;
2864                 } else {
2865                         $sigText = '[[' . $wgContLang->getNsText( NS_USER ) . ":$n|$k]]";
2866                 }
2867                 $text = preg_replace( '/~~~~~/', $d, $text );
2868                 $text = preg_replace( '/~~~~/', "$sigText $d", $text );
2869                 $text = preg_replace( '/~~~/', $sigText, $text );
2870
2871                 # Context links: [[|name]] and [[name (context)|]]
2872                 #
2873                 $tc = "[&;%\\-,.\\(\\)' _0-9A-Za-z\\/:\\x80-\\xff]";
2874                 $np = "[&;%\\-,.' _0-9A-Za-z\\/:\\x80-\\xff]"; # No parens
2875                 $namespacechar = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
2876                 $conpat = "/^({$np}+) \\(({$tc}+)\\)$/";
2877
2878                 $p1 = "/\[\[({$np}+) \\(({$np}+)\\)\\|]]/";             # [[page (context)|]]
2879                 $p2 = "/\[\[\\|({$tc}+)]]/";                                    # [[|page]]
2880                 $p3 = "/\[\[(:*$namespacechar+):({$np}+)\\|]]/";                # [[namespace:page|]] and [[:namespace:page|]]
2881                 $p4 = "/\[\[(:*$namespacechar+):({$np}+) \\(({$np}+)\\)\\|]]/"; # [[ns:page (cont)|]] and [[:ns:page (cont)|]]
2882                 $context = '';
2883                 $t = $this->mTitle->getText();
2884                 if ( preg_match( $conpat, $t, $m ) ) {
2885                         $context = $m[2];
2886                 }
2887                 $text = preg_replace( $p4, '[[\\1:\\2 (\\3)|\\2]]', $text );
2888                 $text = preg_replace( $p1, '[[\\1 (\\2)|\\1]]', $text );
2889                 $text = preg_replace( $p3, '[[\\1:\\2|\\2]]', $text );
2890
2891                 if ( '' == $context ) {
2892                         $text = preg_replace( $p2, '[[\\1]]', $text );
2893                 } else {
2894                         $text = preg_replace( $p2, "[[\\1 ({$context})|\\1]]", $text );
2895                 }
2896
2897                 # Trim trailing whitespace
2898                 # MAG_END (__END__) tag allows for trailing
2899                 # whitespace to be deliberately included
2900                 $text = rtrim( $text );
2901                 $mw =& MagicWord::get( MAG_END );
2902                 $mw->matchAndRemove( $text );
2903
2904                 return $text;
2905         }
2906
2907         /**
2908          * Set up some variables which are usually set up in parse()
2909          * so that an external function can call some class members with confidence
2910          * @access public
2911          */
2912         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
2913                 $this->mTitle =& $title;
2914                 $this->mOptions = $options;
2915                 $this->mOutputType = $outputType;
2916                 if ( $clearState ) {
2917                         $this->clearState();
2918                 }
2919         }
2920
2921         /**
2922          * Transform a MediaWiki message by replacing magic variables.
2923          *
2924          * @param string $text the text to transform
2925          * @param ParserOptions $options  options
2926          * @return string the text with variables substituted
2927          * @access public
2928          */
2929         function transformMsg( $text, $options ) {
2930                 global $wgTitle;
2931                 static $executing = false;
2932
2933                 # Guard against infinite recursion
2934                 if ( $executing ) {
2935                         return $text;
2936                 }
2937                 $executing = true;
2938
2939                 $this->mTitle = $wgTitle;
2940                 $this->mOptions = $options;
2941                 $this->mOutputType = OT_MSG;
2942                 $this->clearState();
2943                 $text = $this->replaceVariables( $text );
2944
2945                 $executing = false;
2946                 return $text;
2947         }
2948
2949         /**
2950          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
2951          * Callback will be called with the text within
2952          * Transform and return the text within
2953          * @access public
2954          */
2955         function setHook( $tag, $callback ) {
2956                 $oldVal = @$this->mTagHooks[$tag];
2957                 $this->mTagHooks[$tag] = $callback;
2958                 return $oldVal;
2959         }
2960
2961         /**
2962          * Replace <!--LINK--> link placeholders with actual links, in the buffer
2963          * Placeholders created in Skin::makeLinkObj()
2964          * Returns an array of links found, indexed by PDBK:
2965          *  0 - broken
2966          *  1 - normal link
2967          *  2 - stub
2968          * $options is a bit field, RLH_FOR_UPDATE to select for update
2969          */
2970         function replaceLinkHolders( &$text, $options = 0 ) {
2971                 global $wgUser, $wgLinkCache, $wgUseOldExistenceCheck, $wgLinkHolders;
2972                 global $wgInterwikiLinkHolders;
2973                 global $outputReplace;
2974
2975                 if ( $wgUseOldExistenceCheck ) {
2976                         return array();
2977                 }
2978
2979                 $fname = 'Parser::replaceLinkHolders';
2980                 wfProfileIn( $fname );
2981
2982                 $pdbks = array();
2983                 $colours = array();
2984
2985                 #if ( !empty( $tmpLinks[0] ) ) { #TODO
2986                 if ( !empty( $wgLinkHolders['namespaces'] ) ) {
2987                         wfProfileIn( $fname.'-check' );
2988                         $dbr =& wfGetDB( DB_SLAVE );
2989                         $page = $dbr->tableName( 'page' );
2990                         $sk = $wgUser->getSkin();
2991                         $threshold = $wgUser->getOption('stubthreshold');
2992
2993                         # Sort by namespace
2994                         asort( $wgLinkHolders['namespaces'] );
2995
2996                         # Generate query
2997                         $query = false;
2998                         foreach ( $wgLinkHolders['namespaces'] as $key => $val ) {
2999                                 # Make title object
3000                                 $title = $wgLinkHolders['titles'][$key];
3001
3002                                 # Skip invalid entries.
3003                                 # Result will be ugly, but prevents crash.
3004                                 if ( is_null( $title ) ) {
3005                                         continue;
3006                                 }
3007                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3008
3009                                 # Check if it's in the link cache already
3010                                 if ( $wgLinkCache->getGoodLinkID( $pdbk ) ) {
3011                                         $colours[$pdbk] = 1;
3012                                 } elseif ( $wgLinkCache->isBadLink( $pdbk ) ) {
3013                                         $colours[$pdbk] = 0;
3014                                 } else {
3015                                         # Not in the link cache, add it to the query
3016                                         if ( !isset( $current ) ) {
3017                                                 $current = $val;
3018                                                 $tables = $page;
3019                                                 $join = '';
3020                                                 $query =  "SELECT page_id, page_namespace, page_title";
3021                                                 if ( $threshold > 0 ) {
3022                                                         $textTable = $dbr->tableName( 'text' );
3023                                                         $query .= ', LENGTH(old_text) AS page_len, page_is_redirect';
3024                                                         $tables .= ", $textTable";
3025                                                         $join = 'page_latest=old_id AND';
3026                                                 }
3027                                                 $query .= " FROM $tables WHERE $join (page_namespace=$val AND page_title IN(";
3028                                         } elseif ( $current != $val ) {
3029                                                 $current = $val;
3030                                                 $query .= ")) OR (page_namespace=$val AND page_title IN(";
3031                                         } else {
3032                                                 $query .= ', ';
3033                                         }
3034
3035                                         $query .= $dbr->addQuotes( $wgLinkHolders['dbkeys'][$key] );
3036                                 }
3037                         }
3038                         if ( $query ) {
3039                                 $query .= '))';
3040                                 if ( $options & RLH_FOR_UPDATE ) {
3041                                         $query .= ' FOR UPDATE';
3042                                 }
3043
3044                                 $res = $dbr->query( $query, $fname );
3045
3046                                 # Fetch data and form into an associative array
3047                                 # non-existent = broken
3048                                 # 1 = known
3049                                 # 2 = stub
3050                                 while ( $s = $dbr->fetchObject($res) ) {
3051                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3052                                         $pdbk = $title->getPrefixedDBkey();
3053                                         $wgLinkCache->addGoodLink( $s->page_id, $pdbk );
3054
3055                                         if ( $threshold >  0 ) {
3056                                                 $size = $s->page_len;
3057                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $length < $threshold ) {
3058                                                         $colours[$pdbk] = 1;
3059                                                 } else {
3060                                                         $colours[$pdbk] = 2;
3061                                                 }
3062                                         } else {
3063                                                 $colours[$pdbk] = 1;
3064                                         }
3065                                 }
3066                         }
3067                         wfProfileOut( $fname.'-check' );
3068
3069                         # Construct search and replace arrays
3070                         wfProfileIn( $fname.'-construct' );
3071                         $outputReplace = array();
3072                         foreach ( $wgLinkHolders['namespaces'] as $key => $ns ) {
3073                                 $pdbk = $pdbks[$key];
3074                                 $searchkey = '<!--LINK '.$key.'-->';
3075                                 $title = $wgLinkHolders['titles'][$key];
3076                                 if ( empty( $colours[$pdbk] ) ) {
3077                                         $wgLinkCache->addBadLink( $pdbk );
3078                                         $colours[$pdbk] = 0;
3079                                         $outputReplace[$searchkey] = $sk->makeBrokenLinkObj( $title,
3080                                                                         $wgLinkHolders['texts'][$key],
3081                                                                         $wgLinkHolders['queries'][$key] );
3082                                 } elseif ( $colours[$pdbk] == 1 ) {
3083                                         $outputReplace[$searchkey] = $sk->makeKnownLinkObj( $title,
3084                                                                         $wgLinkHolders['texts'][$key],
3085                                                                         $wgLinkHolders['queries'][$key] );
3086                                 } elseif ( $colours[$pdbk] == 2 ) {
3087                                         $outputReplace[$searchkey] = $sk->makeStubLinkObj( $title,
3088                                                                         $wgLinkHolders['texts'][$key],
3089                                                                         $wgLinkHolders['queries'][$key] );
3090                                 }
3091                         }
3092                         wfProfileOut( $fname.'-construct' );
3093
3094                         # Do the thing
3095                         wfProfileIn( $fname.'-replace' );
3096
3097                         $text = preg_replace_callback(
3098                                 '/(<!--LINK .*?-->)/',
3099                                 "outputReplaceMatches",
3100                                 $text);
3101                         wfProfileOut( $fname.'-replace' );
3102                 }
3103
3104                 if ( !empty( $wgInterwikiLinkHolders ) ) {
3105                         wfProfileIn( $fname.'-interwiki' );
3106                         $outputReplace = $wgInterwikiLinkHolders;
3107                         $text = preg_replace_callback(
3108                                 '/<!--IWLINK (.*?)-->/',
3109                                 "outputReplaceMatches",
3110                                 $text );
3111                         wfProfileOut( $fname.'-interwiki' );
3112                 }
3113
3114                 wfProfileOut( $fname );
3115                 return $colours;
3116         }
3117
3118         /**
3119          * Renders an image gallery from a text with one line per image.
3120          * text labels may be given by using |-style alternative text. E.g.
3121          *   Image:one.jpg|The number "1"
3122          *   Image:tree.jpg|A tree
3123          * given as text will return the HTML of a gallery with two images,
3124          * labeled 'The number "1"' and
3125          * 'A tree'.
3126          */
3127         function renderImageGallery( $text ) {
3128                 global $wgLinkCache;
3129                 $ig = new ImageGallery();
3130                 $ig->setShowBytes( false );
3131                 $ig->setShowFilename( false );
3132                 $lines = explode( "\n", $text );
3133
3134                 foreach ( $lines as $line ) {
3135                         # match lines like these:
3136                         # Image:someimage.jpg|This is some image
3137                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
3138                         # Skip empty lines
3139                         if ( count( $matches ) == 0 ) {
3140                                 continue;
3141                         }
3142                         $nt = Title::newFromURL( $matches[1] );
3143                         if( is_null( $nt ) ) {
3144                                 # Bogus title. Ignore these so we don't bomb out later.
3145                                 continue;
3146                         }
3147                         if ( isset( $matches[3] ) ) {
3148                                 $label = $matches[3];
3149                         } else {
3150                                 $label = '';
3151                         }
3152
3153                         # FIXME: Use the full wiki parser and add its links
3154                         # to the page's links.
3155                         $html = $this->mOptions->mSkin->formatComment( $label );
3156
3157                         $ig->add( Image::newFromTitle( $nt ), $html );
3158                         $wgLinkCache->addImageLinkObj( $nt );
3159                 }
3160                 return $ig->toHTML();
3161         }
3162 }
3163
3164 /**
3165  * @todo document
3166  * @package MediaWiki
3167  */
3168 class ParserOutput
3169 {
3170         var $mText, $mLanguageLinks, $mCategoryLinks, $mContainsOldMagic;
3171         var $mCacheTime; # Used in ParserCache
3172         var $mVersion;   # Compatibility check
3173
3174         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
3175                 $containsOldMagic = false )
3176         {
3177                 $this->mText = $text;
3178                 $this->mLanguageLinks = $languageLinks;
3179                 $this->mCategoryLinks = $categoryLinks;
3180                 $this->mContainsOldMagic = $containsOldMagic;
3181                 $this->mCacheTime = '';
3182                 $this->mVersion = MW_PARSER_VERSION;
3183         }
3184
3185         function getText()                   { return $this->mText; }
3186         function getLanguageLinks()          { return $this->mLanguageLinks; }
3187         function getCategoryLinks()          { return array_keys( $this->mCategoryLinks ); }
3188         function getCacheTime()              { return $this->mCacheTime; }
3189         function containsOldMagic()          { return $this->mContainsOldMagic; }
3190         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
3191         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
3192         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategoryLinks, $cl ); }
3193         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
3194         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
3195         function addCategoryLink( $c )       { $this->mCategoryLinks[$c] = 1; }
3196
3197         function merge( $other ) {
3198                 $this->mLanguageLinks = array_merge( $this->mLanguageLinks, $other->mLanguageLinks );
3199                 $this->mCategoryLinks = array_merge( $this->mCategoryLinks, $this->mLanguageLinks );
3200                 $this->mContainsOldMagic = $this->mContainsOldMagic || $other->mContainsOldMagic;
3201         }
3202
3203         /**
3204          * Return true if this cached output object predates the global or
3205          * per-article cache invalidation timestamps, or if it comes from
3206          * an incompatible older version.
3207          *
3208          * @param string $touched the affected article's last touched timestamp
3209          * @return bool
3210          * @access public
3211          */
3212         function expired( $touched ) {
3213                 global $wgCacheEpoch;
3214                 return $this->getCacheTime() <= $touched ||
3215                        $this->getCacheTime() <= $wgCacheEpoch ||
3216                        !isset( $this->mVersion ) ||
3217                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
3218         }
3219 }
3220
3221 /**
3222  * Set options of the Parser
3223  * @todo document
3224  * @package MediaWiki
3225  */
3226 class ParserOptions
3227 {
3228         # All variables are private
3229         var $mUseTeX;                    # Use texvc to expand <math> tags
3230         var $mUseDynamicDates;           # Use $wgDateFormatter to format dates
3231         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
3232         var $mAllowExternalImages;       # Allow external images inline
3233         var $mSkin;                      # Reference to the preferred skin
3234         var $mDateFormat;                # Date format index
3235         var $mEditSection;               # Create "edit section" links
3236         var $mEditSectionOnRightClick;   # Generate JavaScript to edit section on right click
3237         var $mNumberHeadings;            # Automatically number headings
3238         var $mShowToc;                   # Show table of contents
3239
3240         function getUseTeX()                        { return $this->mUseTeX; }
3241         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
3242         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
3243         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
3244         function getSkin()                          { return $this->mSkin; }
3245         function getDateFormat()                    { return $this->mDateFormat; }
3246         function getEditSection()                   { return $this->mEditSection; }
3247         function getEditSectionOnRightClick()       { return $this->mEditSectionOnRightClick; }
3248         function getNumberHeadings()                { return $this->mNumberHeadings; }
3249         function getShowToc()                       { return $this->mShowToc; }
3250
3251         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
3252         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
3253         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
3254         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
3255         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
3256         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
3257         function setEditSectionOnRightClick( $x )   { return wfSetVar( $this->mEditSectionOnRightClick, $x ); }
3258         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
3259         function setShowToc( $x )                   { return wfSetVar( $this->mShowToc, $x ); }
3260
3261         function setSkin( &$x ) { $this->mSkin =& $x; }
3262
3263         # Get parser options
3264         /* static */ function newFromUser( &$user ) {
3265                 $popts = new ParserOptions;
3266                 $popts->initialiseFromUser( $user );
3267                 return $popts;
3268         }
3269
3270         # Get user options
3271         function initialiseFromUser( &$userInput ) {
3272                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
3273                 $fname = 'ParserOptions::initialiseFromUser';
3274                 wfProfileIn( $fname );
3275                 if ( !$userInput ) {
3276                         $user = new User;
3277                         $user->setLoaded( true );
3278                 } else {
3279                         $user =& $userInput;
3280                 }
3281
3282                 $this->mUseTeX = $wgUseTeX;
3283                 $this->mUseDynamicDates = $wgUseDynamicDates;
3284                 $this->mInterwikiMagic = $wgInterwikiMagic;
3285                 $this->mAllowExternalImages = $wgAllowExternalImages;
3286                 wfProfileIn( $fname.'-skin' );
3287                 $this->mSkin =& $user->getSkin();
3288                 wfProfileOut( $fname.'-skin' );
3289                 $this->mDateFormat = $user->getOption( 'date' );
3290                 $this->mEditSection = $user->getOption( 'editsection' );
3291                 $this->mEditSectionOnRightClick = $user->getOption( 'editsectiononrightclick' );
3292                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
3293                 $this->mShowToc = $user->getOption( 'showtoc' );
3294                 wfProfileOut( $fname );
3295         }
3296
3297
3298 }
3299
3300 /**
3301  * Callback function used by Parser::replaceLinkHolders()
3302  * to substitute link placeholders.
3303  */
3304 function &outputReplaceMatches( $matches ) {
3305         global $outputReplace;
3306         return $outputReplace[$matches[1]];
3307 }
3308
3309 /**
3310  * Return the total number of articles
3311  */
3312 function wfNumberOfArticles() {
3313         global $wgNumberOfArticles;
3314
3315         wfLoadSiteStats();
3316         return $wgNumberOfArticles;
3317 }
3318
3319 /**
3320  * Get various statistics from the database
3321  * @private
3322  */
3323 function wfLoadSiteStats() {
3324         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
3325         $fname = 'wfLoadSiteStats';
3326
3327         if ( -1 != $wgNumberOfArticles ) return;
3328         $dbr =& wfGetDB( DB_SLAVE );
3329         $s = $dbr->selectRow( 'site_stats',
3330                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
3331                 array( 'ss_row_id' => 1 ), $fname
3332         );
3333
3334         if ( $s === false ) {
3335                 return;
3336         } else {
3337                 $wgTotalViews = $s->ss_total_views;
3338                 $wgTotalEdits = $s->ss_total_edits;
3339                 $wgNumberOfArticles = $s->ss_good_articles;
3340         }
3341 }
3342
3343 function wfEscapeHTMLTagsOnly( $in ) {
3344         return str_replace(
3345                 array( '"', '>', '<' ),
3346                 array( '&quot;', '&gt;', '&lt;' ),
3347                 $in );
3348 }
3349
3350 ?>