includes/Parser.php

   1 <?php
   2 /**
   3  * File for Parser and related classes
   4  *
   5  * @addtogroup Parser
   6  */
   7
   8 /**
   9  * Update this version number when the ParserOutput format
  10  * changes in an incompatible way, so the parser cache
  11  * can automatically discard old data.
  12  */
  13 define( 'MW_PARSER_VERSION', '1.6.1' );
  14
  15 define( 'RLH_FOR_UPDATE', 1 );
  16
  17 # Allowed values for $mOutputType
  18 define( 'OT_HTML', 1 );
  19 define( 'OT_WIKI', 2 );
  20 define( 'OT_MSG' , 3 );
  21 define( 'OT_PREPROCESS', 4 );
  22
  23 # Flags for setFunctionHook
  24 define( 'SFH_NO_HASH', 1 );
  25
  26 # string parameter for extractTags which will cause it
  27 # to strip HTML comments in addition to regular
  28 # <XML>-style tags. This should not be anything we
  29 # may want to use in wikisyntax
  30 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  31
  32 # Constants needed for external link processing
  33 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  34 # Everything except bracket, space, or control characters
  35 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  36 # Including space, but excluding newlines
  37 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x0a\\x0d]' );
  38 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  39 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  40 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.
  41         EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  42 define( 'EXT_IMAGE_REGEX',
  43         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  44         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  45         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  46 );
  47
  48 // State constants for the definition list colon extraction
  49 define( 'MW_COLON_STATE_TEXT', 0 );
  50 define( 'MW_COLON_STATE_TAG', 1 );
  51 define( 'MW_COLON_STATE_TAGSTART', 2 );
  52 define( 'MW_COLON_STATE_CLOSETAG', 3 );
  53 define( 'MW_COLON_STATE_TAGSLASH', 4 );
  54 define( 'MW_COLON_STATE_COMMENT', 5 );
  55 define( 'MW_COLON_STATE_COMMENTDASH', 6 );
  56 define( 'MW_COLON_STATE_COMMENTDASHDASH', 7 );
  57
  58 /**
  59  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  60  * syntax, such as "[[link]]" for making links), and provides a one-way
  61  * transformation of that wiki markup it into XHTML output / markup
  62  * (which in turn the browser understands, and can display).
  63  *
  64  * <pre>
  65  * There are four main entry points into the Parser class:
  66  * parse()
  67  *   produces HTML output
  68  * preSaveTransform().
  69  *   produces altered wiki markup.
  70  * transformMsg()
  71  *   performs brace substitution on MediaWiki messages
  72  * preprocess()
  73  *   removes HTML comments and expands templates
  74  *
  75  * Globals used:
  76  *    objects:   $wgLang, $wgContLang
  77  *
  78  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  79  *
  80  * settings:
  81  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  82  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  83  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  84  *  $wgMaxArticleSize*
  85  *
  86  *  * only within ParserOptions
  87  * </pre>
  88  *
  89  * @addtogroup Parser
  90  */
  91 class Parser
  92 {
  93         const VERSION = MW_PARSER_VERSION;
  94         /**#@+
  95          * @private
  96          */
  97         # Persistent:
  98         var $mTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables;
  99
 100         # Cleared with clearState():
 101         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 102         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 103         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 104         var $mIncludeSizes, $mDefaultSort;
 105         var $mTemplates,        // cache of already loaded templates, avoids
 106                                 // multiple SQL queries for the same string
 107             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 108                                 // in this path. Used for loop detection.
 109
 110         # Temporary
 111         # These are variables reset at least once per parse regardless of $clearState
 112         var $mOptions,      // ParserOptions object
 113                 $mTitle,        // Title context, used for self-link rendering and similar things
 114                 $mOutputType,   // Output type, one of the OT_xxx constants
 115                 $ot,            // Shortcut alias, see setOutputType()
 116                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 117                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 118                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 119
 120         /**#@-*/
 121
 122         /**
 123          * Constructor
 124          *
 125          * @public
 126          */
 127         function Parser() {
 128                 $this->mTagHooks = array();
 129                 $this->mFunctionHooks = array();
 130                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 131                 $this->mFirstCall = true;
 132         }
 133
 134         /**
 135          * Do various kinds of initialisation on the first call of the parser
 136          */
 137         function firstCallInit() {
 138                 if ( !$this->mFirstCall ) {
 139                         return;
 140                 }
 141
 142                 wfProfileIn( __METHOD__ );
 143                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 144
 145                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 146
 147                 $this->setFunctionHook( 'int', array( 'CoreParserFunctions', 'intFunction' ), SFH_NO_HASH );
 148                 $this->setFunctionHook( 'ns', array( 'CoreParserFunctions', 'ns' ), SFH_NO_HASH );
 149                 $this->setFunctionHook( 'urlencode', array( 'CoreParserFunctions', 'urlencode' ), SFH_NO_HASH );
 150                 $this->setFunctionHook( 'lcfirst', array( 'CoreParserFunctions', 'lcfirst' ), SFH_NO_HASH );
 151                 $this->setFunctionHook( 'ucfirst', array( 'CoreParserFunctions', 'ucfirst' ), SFH_NO_HASH );
 152                 $this->setFunctionHook( 'lc', array( 'CoreParserFunctions', 'lc' ), SFH_NO_HASH );
 153                 $this->setFunctionHook( 'uc', array( 'CoreParserFunctions', 'uc' ), SFH_NO_HASH );
 154                 $this->setFunctionHook( 'localurl', array( 'CoreParserFunctions', 'localurl' ), SFH_NO_HASH );
 155                 $this->setFunctionHook( 'localurle', array( 'CoreParserFunctions', 'localurle' ), SFH_NO_HASH );
 156                 $this->setFunctionHook( 'fullurl', array( 'CoreParserFunctions', 'fullurl' ), SFH_NO_HASH );
 157                 $this->setFunctionHook( 'fullurle', array( 'CoreParserFunctions', 'fullurle' ), SFH_NO_HASH );
 158                 $this->setFunctionHook( 'formatnum', array( 'CoreParserFunctions', 'formatnum' ), SFH_NO_HASH );
 159                 $this->setFunctionHook( 'grammar', array( 'CoreParserFunctions', 'grammar' ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'plural', array( 'CoreParserFunctions', 'plural' ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'numberofpages', array( 'CoreParserFunctions', 'numberofpages' ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'numberofusers', array( 'CoreParserFunctions', 'numberofusers' ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 164                 $this->setFunctionHook( 'numberoffiles', array( 'CoreParserFunctions', 'numberoffiles' ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'numberofadmins', array( 'CoreParserFunctions', 'numberofadmins' ), SFH_NO_HASH );
 166                 $this->setFunctionHook( 'numberofedits', array( 'CoreParserFunctions', 'numberofedits' ), SFH_NO_HASH );
 167                 $this->setFunctionHook( 'language', array( 'CoreParserFunctions', 'language' ), SFH_NO_HASH );
 168                 $this->setFunctionHook( 'padleft', array( 'CoreParserFunctions', 'padleft' ), SFH_NO_HASH );
 169                 $this->setFunctionHook( 'padright', array( 'CoreParserFunctions', 'padright' ), SFH_NO_HASH );
 170                 $this->setFunctionHook( 'anchorencode', array( 'CoreParserFunctions', 'anchorencode' ), SFH_NO_HASH );
 171                 $this->setFunctionHook( 'special', array( 'CoreParserFunctions', 'special' ) );
 172                 $this->setFunctionHook( 'defaultsort', array( 'CoreParserFunctions', 'defaultsort' ), SFH_NO_HASH );
 173
 174                 if ( $wgAllowDisplayTitle ) {
 175                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 176                 }
 177                 if ( $wgAllowSlowParserFunctions ) {
 178                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 179                 }
 180
 181                 $this->initialiseVariables();
 182                 $this->mFirstCall = false;
 183                 wfProfileOut( __METHOD__ );
 184         }
 185
 186         /**
 187          * Clear Parser state
 188          *
 189          * @private
 190          */
 191         function clearState() {
 192                 wfProfileIn( __METHOD__ );
 193                 if ( $this->mFirstCall ) {
 194                         $this->firstCallInit();
 195                 }
 196                 $this->mOutput = new ParserOutput;
 197                 $this->mAutonumber = 0;
 198                 $this->mLastSection = '';
 199                 $this->mDTopen = false;
 200                 $this->mIncludeCount = array();
 201                 $this->mStripState = new StripState;
 202                 $this->mArgStack = array();
 203                 $this->mInPre = false;
 204                 $this->mInterwikiLinkHolders = array(
 205                         'texts' => array(),
 206                         'titles' => array()
 207                 );
 208                 $this->mLinkHolders = array(
 209                         'namespaces' => array(),
 210                         'dbkeys' => array(),
 211                         'queries' => array(),
 212                         'texts' => array(),
 213                         'titles' => array()
 214                 );
 215                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 216
 217                 /**
 218                  * Prefix for temporary replacement strings for the multipass parser.
 219                  * \x07 should never appear in input as it's disallowed in XML.
 220                  * Using it at the front also gives us a little extra robustness
 221                  * since it shouldn't match when butted up against identifier-like
 222                  * string constructs.
 223                  */
 224                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 225
 226                 # Clear these on every parse, bug 4549
 227                 $this->mTemplates = array();
 228                 $this->mTemplatePath = array();
 229
 230                 $this->mShowToc = true;
 231                 $this->mForceTocPosition = false;
 232                 $this->mIncludeSizes = array(
 233                         'pre-expand' => 0,
 234                         'post-expand' => 0,
 235                         'arg' => 0
 236                 );
 237                 $this->mDefaultSort = false;
 238
 239                 wfRunHooks( 'ParserClearState', array( &$this ) );
 240                 wfProfileOut( __METHOD__ );
 241         }
 242
 243         function setOutputType( $ot ) {
 244                 $this->mOutputType = $ot;
 245                 // Shortcut alias
 246                 $this->ot = array(
 247                         'html' => $ot == OT_HTML,
 248                         'wiki' => $ot == OT_WIKI,
 249                         'msg' => $ot == OT_MSG,
 250                         'pre' => $ot == OT_PREPROCESS,
 251                 );
 252         }
 253
 254         /**
 255          * Accessor for mUniqPrefix.
 256          *
 257          * @public
 258          */
 259         function uniqPrefix() {
 260                 return $this->mUniqPrefix;
 261         }
 262
 263         /**
 264          * Convert wikitext to HTML
 265          * Do not call this function recursively.
 266          *
 267          * @param string $text Text we want to parse
 268          * @param Title &$title A title object
 269          * @param array $options
 270          * @param boolean $linestart
 271          * @param boolean $clearState
 272          * @param int $revid number to pass in {{REVISIONID}}
 273          * @return ParserOutput a ParserOutput
 274          */
 275         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 276                 /**
 277                  * First pass--just handle <nowiki> sections, pass the rest off
 278                  * to internalParse() which does all the real work.
 279                  */
 280
 281                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 282                 $fname = 'Parser::parse-' . wfGetCaller();
 283                 wfProfileIn( __METHOD__ );
 284                 wfProfileIn( $fname );
 285
 286                 if ( $clearState ) {
 287                         $this->clearState();
 288                 }
 289
 290                 $this->mOptions = $options;
 291                 $this->mTitle =& $title;
 292                 $oldRevisionId = $this->mRevisionId;
 293                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 294                 if( $revid !== null ) {
 295                         $this->mRevisionId = $revid;
 296                         $this->mRevisionTimestamp = null;
 297                 }
 298                 $this->setOutputType( OT_HTML );
 299                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 300                 $text = $this->strip( $text, $this->mStripState );
 301                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 302                 $text = $this->internalParse( $text );
 303                 $text = $this->mStripState->unstripGeneral( $text );
 304
 305                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 306                 $fixtags = array(
 307                         # french spaces, last one Guillemet-left
 308                         # only if there is something before the space
 309                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 310                         # french spaces, Guillemet-right
 311                         '/(\\302\\253) /' => '\\1&nbsp;',
 312                 );
 313                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 314
 315                 # only once and last
 316                 $text = $this->doBlockLevels( $text, $linestart );
 317
 318                 $this->replaceLinkHolders( $text );
 319
 320                 # the position of the parserConvert() call should not be changed. it
 321                 # assumes that the links are all replaced and the only thing left
 322                 # is the <nowiki> mark.
 323                 # Side-effects: this calls $this->mOutput->setTitleText()
 324                 $text = $wgContLang->parserConvert( $text, $this );
 325
 326                 $text = $this->mStripState->unstripNoWiki( $text );
 327
 328                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 329
 330                 $text = Sanitizer::normalizeCharReferences( $text );
 331
 332                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 333                         $text = Tidy::RunOn($text);
 334                 } else {
 335                         # attempt to sanitize at least some nesting problems
 336                         # (bug #2702 and quite a few others)
 337                         $tidyregs = array(
 338                                 # ''Something [http://www.cool.com cool''] -->
 339                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 340                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 341                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 342                                 # fix up an anchor inside another anchor, only
 343                                 # at least for a single single nested link (bug 3695)
 344                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 345                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 346                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 347                                 # contains a div, so fix it up here; replace
 348                                 # div with escaped text
 349                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 350                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 351                                 # remove empty italic or bold tag pairs, some
 352                                 # introduced by rules above
 353                                 '/<([bi])><\/\\1>/' => '',
 354                         );
 355
 356                         $text = preg_replace(
 357                                 array_keys( $tidyregs ),
 358                                 array_values( $tidyregs ),
 359                                 $text );
 360                 }
 361
 362                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 363
 364                 # Information on include size limits, for the benefit of users who try to skirt them
 365                 if ( max( $this->mIncludeSizes ) > 1000 ) {
 366                         $max = $this->mOptions->getMaxIncludeSize();
 367                         $text .= "<!-- \n" .
 368                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']} bytes\n" .
 369                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']} bytes\n" .
 370                                 "Template argument size: {$this->mIncludeSizes['arg']} bytes\n" .
 371                                 "Maximum: $max bytes\n" .
 372                                 "-->\n";
 373                 }
 374                 $this->mOutput->setText( $text );
 375                 $this->mRevisionId = $oldRevisionId;
 376                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 377                 wfProfileOut( $fname );
 378                 wfProfileOut( __METHOD__ );
 379
 380                 return $this->mOutput;
 381         }
 382
 383         /**
 384          * Recursive parser entry point that can be called from an extension tag
 385          * hook.
 386          */
 387         function recursiveTagParse( $text ) {
 388                 wfProfileIn( __METHOD__ );
 389                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 390                 $text = $this->strip( $text, $this->mStripState );
 391                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 392                 $text = $this->internalParse( $text );
 393                 wfProfileOut( __METHOD__ );
 394                 return $text;
 395         }
 396
 397         /**
 398          * Expand templates and variables in the text, producing valid, static wikitext.
 399          * Also removes comments.
 400          */
 401         function preprocess( $text, $title, $options ) {
 402                 wfProfileIn( __METHOD__ );
 403                 $this->clearState();
 404                 $this->setOutputType( OT_PREPROCESS );
 405                 $this->mOptions = $options;
 406                 $this->mTitle = $title;
 407                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 408                 $text = $this->strip( $text, $this->mStripState );
 409                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 410                 if ( $this->mOptions->getRemoveComments() ) {
 411                         $text = Sanitizer::removeHTMLcomments( $text );
 412                 }
 413                 $text = $this->replaceVariables( $text );
 414                 $text = $this->mStripState->unstripBoth( $text );
 415                 wfProfileOut( __METHOD__ );
 416                 return $text;
 417         }
 418
 419         /**
 420          * Get a random string
 421          *
 422          * @private
 423          * @static
 424          */
 425         function getRandomString() {
 426                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 427         }
 428
 429         function &getTitle() { return $this->mTitle; }
 430         function getOptions() { return $this->mOptions; }
 431
 432         function getFunctionLang() {
 433                 global $wgLang, $wgContLang;
 434                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 435         }
 436
 437         /**
 438          * Replaces all occurrences of HTML-style comments and the given tags
 439          * in the text with a random marker and returns teh next text. The output
 440          * parameter $matches will be an associative array filled with data in
 441          * the form:
 442          *   'UNIQ-xxxxx' => array(
 443          *     'element',
 444          *     'tag content',
 445          *     array( 'param' => 'x' ),
 446          *     '<element param="x">tag content</element>' ) )
 447          *
 448          * @param $elements list of element names. Comments are always extracted.
 449          * @param $text Source text string.
 450          * @param $uniq_prefix
 451          *
 452          * @private
 453          * @static
 454          */
 455         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 456                 static $n = 1;
 457                 $stripped = '';
 458                 $matches = array();
 459
 460                 $taglist = implode( '|', $elements );
 461                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 462
 463                 while ( '' != $text ) {
 464                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 465                         $stripped .= $p[0];
 466                         if( count( $p ) < 5 ) {
 467                                 break;
 468                         }
 469                         if( count( $p ) > 5 ) {
 470                                 // comment
 471                                 $element    = $p[4];
 472                                 $attributes = '';
 473                                 $close      = '';
 474                                 $inside     = $p[5];
 475                         } else {
 476                                 // tag
 477                                 $element    = $p[1];
 478                                 $attributes = $p[2];
 479                                 $close      = $p[3];
 480                                 $inside     = $p[4];
 481                         }
 482
 483                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . '-QINU';
 484                         $stripped .= $marker;
 485
 486                         if ( $close === '/>' ) {
 487                                 // Empty element tag, <tag />
 488                                 $content = null;
 489                                 $text = $inside;
 490                                 $tail = null;
 491                         } else {
 492                                 if( $element == '!--' ) {
 493                                         $end = '/(-->)/';
 494                                 } else {
 495                                         $end = "/(<\\/$element\\s*>)/i";
 496                                 }
 497                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 498                                 $content = $q[0];
 499                                 if( count( $q ) < 3 ) {
 500                                         # No end tag -- let it run out to the end of the text.
 501                                         $tail = '';
 502                                         $text = '';
 503                                 } else {
 504                                         $tail = $q[1];
 505                                         $text = $q[2];
 506                                 }
 507                         }
 508
 509                         $matches[$marker] = array( $element,
 510                                 $content,
 511                                 Sanitizer::decodeTagAttributes( $attributes ),
 512                                 "<$element$attributes$close$content$tail" );
 513                 }
 514                 return $stripped;
 515         }
 516
 517         /**
 518          * Strips and renders nowiki, pre, math, hiero
 519          * If $render is set, performs necessary rendering operations on plugins
 520          * Returns the text, and fills an array with data needed in unstrip()
 521          *
 522          * @param StripState $state
 523          *
 524          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 525          *  will be stripped in addition to other tags. This is important
 526          *  for section editing, where these comments cause confusion when
 527          *  counting the sections in the wikisource
 528          *
 529          * @param array dontstrip contains tags which should not be stripped;
 530          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 531          *
 532          * @private
 533          */
 534         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 535                 global $wgContLang;
 536                 wfProfileIn( __METHOD__ );
 537                 $render = ($this->mOutputType == OT_HTML);
 538
 539                 $uniq_prefix = $this->mUniqPrefix;
 540                 $commentState = new ReplacementArray;
 541                 $nowikiItems = array();
 542                 $generalItems = array();
 543
 544                 $elements = array_merge(
 545                         array( 'nowiki', 'gallery' ),
 546                         array_keys( $this->mTagHooks ) );
 547                 global $wgRawHtml;
 548                 if( $wgRawHtml ) {
 549                         $elements[] = 'html';
 550                 }
 551                 if( $this->mOptions->getUseTeX() ) {
 552                         $elements[] = 'math';
 553                 }
 554
 555                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 556                 foreach ( $elements AS $k => $v ) {
 557                         if ( !in_array ( $v , $dontstrip ) ) continue;
 558                         unset ( $elements[$k] );
 559                 }
 560
 561                 $matches = array();
 562                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 563
 564                 foreach( $matches as $marker => $data ) {
 565                         list( $element, $content, $params, $tag ) = $data;
 566                         if( $render ) {
 567                                 $tagName = strtolower( $element );
 568                                 wfProfileIn( __METHOD__."-render-$tagName" );
 569                                 switch( $tagName ) {
 570                                 case '!--':
 571                                         // Comment
 572                                         if( substr( $tag, -3 ) == '-->' ) {
 573                                                 $output = $tag;
 574                                         } else {
 575                                                 // Unclosed comment in input.
 576                                                 // Close it so later stripping can remove it
 577                                                 $output = "$tag-->";
 578                                         }
 579                                         break;
 580                                 case 'html':
 581                                         if( $wgRawHtml ) {
 582                                                 $output = $content;
 583                                                 break;
 584                                         }
 585                                         // Shouldn't happen otherwise. :)
 586                                 case 'nowiki':
 587                                         $output = Xml::escapeTagsOnly( $content );
 588                                         break;
 589                                 case 'math':
 590                                         $output = $wgContLang->armourMath( MathRenderer::renderMath( $content ) );
 591                                         break;
 592                                 case 'gallery':
 593                                         $output = $this->renderImageGallery( $content, $params );
 594                                         break;
 595                                 default:
 596                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 597                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 598                                                         array( $content, $params, $this ) );
 599                                         } else {
 600                                                 throw new MWException( "Invalid call hook $element" );
 601                                         }
 602                                 }
 603                                 wfProfileOut( __METHOD__."-render-$tagName" );
 604                         } else {
 605                                 // Just stripping tags; keep the source
 606                                 $output = $tag;
 607                         }
 608
 609                         // Unstrip the output, to support recursive strip() calls
 610                         $output = $state->unstripBoth( $output );
 611
 612                         if( !$stripcomments && $element == '!--' ) {
 613                                 $commentState->setPair( $marker, $output );
 614                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 615                                 $nowikiItems[$marker] = $output;
 616                         } else {
 617                                 $generalItems[$marker] = $output;
 618                         }
 619                 }
 620                 # Add the new items to the state
 621                 # We do this after the loop instead of during it to avoid slowing
 622                 # down the recursive unstrip
 623                 $state->nowiki->mergeArray( $nowikiItems );
 624                 $state->general->mergeArray( $generalItems );
 625
 626                 # Unstrip comments unless explicitly told otherwise.
 627                 # (The comments are always stripped prior to this point, so as to
 628                 # not invoke any extension tags / parser hooks contained within
 629                 # a comment.)
 630                 if ( !$stripcomments ) {
 631                         // Put them all back and forget them
 632                         $text = $commentState->replace( $text );
 633                 }
 634
 635                 wfProfileOut( __METHOD__ );
 636                 return $text;
 637         }
 638
 639         /**
 640          * Restores pre, math, and other extensions removed by strip()
 641          *
 642          * always call unstripNoWiki() after this one
 643          * @private
 644          * @deprecated use $this->mStripState->unstrip()
 645          */
 646         function unstrip( $text, $state ) {
 647                 return $state->unstripGeneral( $text );
 648         }
 649
 650         /**
 651          * Always call this after unstrip() to preserve the order
 652          *
 653          * @private
 654          * @deprecated use $this->mStripState->unstrip()
 655          */
 656         function unstripNoWiki( $text, $state ) {
 657                 return $state->unstripNoWiki( $text );
 658         }
 659
 660         /**
 661          * @deprecated use $this->mStripState->unstripBoth()
 662          */
 663         function unstripForHTML( $text ) {
 664                 return $this->mStripState->unstripBoth( $text );
 665         }
 666
 667         /**
 668          * Add an item to the strip state
 669          * Returns the unique tag which must be inserted into the stripped text
 670          * The tag will be replaced with the original text in unstrip()
 671          *
 672          * @private
 673          */
 674         function insertStripItem( $text, &$state ) {
 675                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 676                 $state->general->setPair( $rnd, $text );
 677                 return $rnd;
 678         }
 679
 680         /**
 681          * parse the wiki syntax used to render tables
 682          *
 683          * @private
 684          */
 685         function doTableStuff ( $text ) {
 686                 $fname = 'Parser::doTableStuff';
 687                 wfProfileIn( $fname );
 688
 689                 $lines = explode ( "\n" , $text );
 690                 $td_history = array (); // Is currently a td tag open?
 691                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 692                 $tr_history = array (); // Is currently a tr tag open?
 693                 $tr_attributes = array (); // history of tr attributes
 694                 $has_opened_tr = array(); // Did this table open a <tr> element?
 695                 $indent_level = 0; // indent level of the table
 696                 foreach ( $lines as $key => $line )
 697                 {
 698                         $line = trim ( $line );
 699
 700                         if( $line == '' ) { // empty line, go to next line
 701                                 continue;
 702                         }
 703                         $first_character = $line{0};
 704                         $matches = array();
 705
 706                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 707                                 // First check if we are starting a new table
 708                                 $indent_level = strlen( $matches[1] );
 709
 710                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 711                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 712
 713                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 714                                 array_push ( $td_history , false );
 715                                 array_push ( $last_tag_history , '' );
 716                                 array_push ( $tr_history , false );
 717                                 array_push ( $tr_attributes , '' );
 718                                 array_push ( $has_opened_tr , false );
 719                         } else if ( count ( $td_history ) == 0 ) {
 720                                 // Don't do any of the following
 721                                 continue;
 722                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 723                                 // We are ending a table
 724                                 $line = '</table>' . substr ( $line , 2 );
 725                                 $last_tag = array_pop ( $last_tag_history );
 726
 727                                 if ( !array_pop ( $has_opened_tr ) ) {
 728                                         $line = "<tr><td></td></tr>{$line}";
 729                                 }
 730
 731                                 if ( array_pop ( $tr_history ) ) {
 732                                         $line = "</tr>{$line}";
 733                                 }
 734
 735                                 if ( array_pop ( $td_history ) ) {
 736                                         $line = "</{$last_tag}>{$line}";
 737                                 }
 738                                 array_pop ( $tr_attributes );
 739                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 740                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 741                                 // Now we have a table row
 742                                 $line = preg_replace( '#^\|-+#', '', $line );
 743
 744                                 // Whats after the tag is now only attributes
 745                                 $attributes = $this->mStripState->unstripBoth( $line );
 746                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 747                                 array_pop ( $tr_attributes );
 748                                 array_push ( $tr_attributes , $attributes );
 749
 750                                 $line = '';
 751                                 $last_tag = array_pop ( $last_tag_history );
 752                                 array_pop ( $has_opened_tr );
 753                                 array_push ( $has_opened_tr , true );
 754
 755                                 if ( array_pop ( $tr_history ) ) {
 756                                         $line = '</tr>';
 757                                 }
 758
 759                                 if ( array_pop ( $td_history ) ) {
 760                                         $line = "</{$last_tag}>{$line}";
 761                                 }
 762
 763                                 $lines[$key] = $line;
 764                                 array_push ( $tr_history , false );
 765                                 array_push ( $td_history , false );
 766                                 array_push ( $last_tag_history , '' );
 767                         }
 768                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 769                                 // This might be cell elements, td, th or captions
 770                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 771                                         $first_character = '+';
 772                                         $line = substr ( $line , 1 );
 773                                 }
 774
 775                                 $line = substr ( $line , 1 );
 776
 777                                 if ( $first_character == '!' ) {
 778                                         $line = str_replace ( '!!' , '||' , $line );
 779                                 }
 780
 781                                 // Split up multiple cells on the same line.
 782                                 // FIXME : This can result in improper nesting of tags processed
 783                                 // by earlier parser steps, but should avoid splitting up eg
 784                                 // attribute values containing literal "||".
 785                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 786
 787                                 $lines[$key] = '';
 788
 789                                 // Loop through each table cell
 790                                 foreach ( $cells as $cell )
 791                                 {
 792                                         $previous = '';
 793                                         if ( $first_character != '+' )
 794                                         {
 795                                                 $tr_after = array_pop ( $tr_attributes );
 796                                                 if ( !array_pop ( $tr_history ) ) {
 797                                                         $previous = "<tr{$tr_after}>\n";
 798                                                 }
 799                                                 array_push ( $tr_history , true );
 800                                                 array_push ( $tr_attributes , '' );
 801                                                 array_pop ( $has_opened_tr );
 802                                                 array_push ( $has_opened_tr , true );
 803                                         }
 804
 805                                         $last_tag = array_pop ( $last_tag_history );
 806
 807                                         if ( array_pop ( $td_history ) ) {
 808                                                 $previous = "</{$last_tag}>{$previous}";
 809                                         }
 810
 811                                         if ( $first_character == '|' ) {
 812                                                 $last_tag = 'td';
 813                                         } else if ( $first_character == '!' ) {
 814                                                 $last_tag = 'th';
 815                                         } else if ( $first_character == '+' ) {
 816                                                 $last_tag = 'caption';
 817                                         } else {
 818                                                 $last_tag = '';
 819                                         }
 820
 821                                         array_push ( $last_tag_history , $last_tag );
 822
 823                                         // A cell could contain both parameters and data
 824                                         $cell_data = explode ( '|' , $cell , 2 );
 825
 826                                         // Bug 553: Note that a '|' inside an invalid link should not
 827                                         // be mistaken as delimiting cell parameters
 828                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 829                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 830                                         } else if ( count ( $cell_data ) == 1 )
 831                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 832                                         else {
 833                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 834                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 835                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 836                                         }
 837
 838                                         $lines[$key] .= $cell;
 839                                         array_push ( $td_history , true );
 840                                 }
 841                         }
 842                 }
 843
 844                 // Closing open td, tr && table
 845                 while ( count ( $td_history ) > 0 )
 846                 {
 847                         if ( array_pop ( $td_history ) ) {
 848                                 $lines[] = '</td>' ;
 849                         }
 850                         if ( array_pop ( $tr_history ) ) {
 851                                 $lines[] = '</tr>' ;
 852                         }
 853                         if ( !array_pop ( $has_opened_tr ) ) {
 854                                 $lines[] = "<tr><td></td></tr>" ;
 855                         }
 856
 857                         $lines[] = '</table>' ;
 858                 }
 859
 860                 $output = implode ( "\n" , $lines ) ;
 861
 862                 // special case: don't return empty table
 863                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 864                         $output = '';
 865                 }
 866
 867                 wfProfileOut( $fname );
 868
 869                 return $output;
 870         }
 871
 872         /**
 873          * Helper function for parse() that transforms wiki markup into
 874          * HTML. Only called for $mOutputType == OT_HTML.
 875          *
 876          * @private
 877          */
 878         function internalParse( $text ) {
 879                 $args = array();
 880                 $isMain = true;
 881                 $fname = 'Parser::internalParse';
 882                 wfProfileIn( $fname );
 883
 884                 # Hook to suspend the parser in this state
 885                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 886                         wfProfileOut( $fname );
 887                         return $text ;
 888                 }
 889
 890                 # Remove <noinclude> tags and <includeonly> sections
 891                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 892                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 893                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
 894
 895                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 896
 897                 $text = $this->replaceVariables( $text, $args );
 898                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text ) );
 899
 900                 // Tables need to come after variable replacement for things to work
 901                 // properly; putting them before other transformations should keep
 902                 // exciting things like link expansions from showing up in surprising
 903                 // places.
 904                 $text = $this->doTableStuff( $text );
 905
 906                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 907
 908                 $text = $this->stripToc( $text );
 909                 $this->stripNoGallery( $text );
 910                 $text = $this->doHeadings( $text );
 911                 if($this->mOptions->getUseDynamicDates()) {
 912                         $df =& DateFormatter::getInstance();
 913                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 914                 }
 915                 $text = $this->doAllQuotes( $text );
 916                 $text = $this->replaceInternalLinks( $text );
 917                 $text = $this->replaceExternalLinks( $text );
 918
 919                 # replaceInternalLinks may sometimes leave behind
 920                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 921                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 922
 923                 $text = $this->doMagicLinks( $text );
 924                 $text = $this->formatHeadings( $text, $isMain );
 925
 926                 wfProfileOut( $fname );
 927                 return $text;
 928         }
 929
 930         /**
 931          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 932          * magic external links.
 933          *
 934          * @private
 935          */
 936         function &doMagicLinks( &$text ) {
 937                 wfProfileIn( __METHOD__ );
 938                 $text = preg_replace_callback(
 939                         '!(?:                           # Start cases
 940                             <a.*?</a> |                 # Skip link text
 941                             <.*?> |                     # Skip stuff inside HTML elements
 942                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
 943                             ISBN\s+(\b                  # ISBN, capture number as m[2]
 944                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 945                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 946                                      [0-9Xx]                 # check digit
 947                                    \b)
 948                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 949                 wfProfileOut( __METHOD__ );
 950                 return $text;
 951         }
 952
 953         function magicLinkCallback( $m ) {
 954                 if ( substr( $m[0], 0, 1 ) == '<' ) {
 955                         # Skip HTML element
 956                         return $m[0];
 957                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
 958                         $isbn = $m[2];
 959                         $num = strtr( $isbn, array(
 960                                 '-' => '',
 961                                 ' ' => '',
 962                                 'x' => 'X',
 963                         ));
 964                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
 965                         $text = '<a href="' .
 966                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
 967                                 "\" class=\"internal\">ISBN $isbn</a>";
 968                 } else {
 969                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
 970                                 $keyword = 'RFC';
 971                                 $urlmsg = 'rfcurl';
 972                                 $id = $m[1];
 973                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
 974                                 $keyword = 'PMID';
 975                                 $urlmsg = 'pubmedurl';
 976                                 $id = $m[1];
 977                         } else {
 978                                 throw new MWException( __METHOD__.': unrecognised match type "' .
 979                                         substr($m[0], 0, 20 ) . '"' );
 980                         }
 981
 982                         $url = wfMsg( $urlmsg, $id);
 983                         $sk = $this->mOptions->getSkin();
 984                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
 985                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
 986                 }
 987                 return $text;
 988         }
 989
 990         /**
 991          * Parse headers and return html
 992          *
 993          * @private
 994          */
 995         function doHeadings( $text ) {
 996                 $fname = 'Parser::doHeadings';
 997                 wfProfileIn( $fname );
 998                 for ( $i = 6; $i >= 1; --$i ) {
 999                         $h = str_repeat( '=', $i );
1000                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1001                           "<h{$i}>\\1</h{$i}>\\2", $text );
1002                 }
1003                 wfProfileOut( $fname );
1004                 return $text;
1005         }
1006
1007         /**
1008          * Replace single quotes with HTML markup
1009          * @private
1010          * @return string the altered text
1011          */
1012         function doAllQuotes( $text ) {
1013                 $fname = 'Parser::doAllQuotes';
1014                 wfProfileIn( $fname );
1015                 $outtext = '';
1016                 $lines = explode( "\n", $text );
1017                 foreach ( $lines as $line ) {
1018                         $outtext .= $this->doQuotes ( $line ) . "\n";
1019                 }
1020                 $outtext = substr($outtext, 0,-1);
1021                 wfProfileOut( $fname );
1022                 return $outtext;
1023         }
1024
1025         /**
1026          * Helper function for doAllQuotes()
1027          * @private
1028          */
1029         function doQuotes( $text ) {
1030                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1031                 if ( count( $arr ) == 1 )
1032                         return $text;
1033                 else
1034                 {
1035                         # First, do some preliminary work. This may shift some apostrophes from
1036                         # being mark-up to being text. It also counts the number of occurrences
1037                         # of bold and italics mark-ups.
1038                         $i = 0;
1039                         $numbold = 0;
1040                         $numitalics = 0;
1041                         foreach ( $arr as $r )
1042                         {
1043                                 if ( ( $i % 2 ) == 1 )
1044                                 {
1045                                         # If there are ever four apostrophes, assume the first is supposed to
1046                                         # be text, and the remaining three constitute mark-up for bold text.
1047                                         if ( strlen( $arr[$i] ) == 4 )
1048                                         {
1049                                                 $arr[$i-1] .= "'";
1050                                                 $arr[$i] = "'''";
1051                                         }
1052                                         # If there are more than 5 apostrophes in a row, assume they're all
1053                                         # text except for the last 5.
1054                                         else if ( strlen( $arr[$i] ) > 5 )
1055                                         {
1056                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1057                                                 $arr[$i] = "'''''";
1058                                         }
1059                                         # Count the number of occurrences of bold and italics mark-ups.
1060                                         # We are not counting sequences of five apostrophes.
1061                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1062                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1063                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1064                                 }
1065                                 $i++;
1066                         }
1067
1068                         # If there is an odd number of both bold and italics, it is likely
1069                         # that one of the bold ones was meant to be an apostrophe followed
1070                         # by italics. Which one we cannot know for certain, but it is more
1071                         # likely to be one that has a single-letter word before it.
1072                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1073                         {
1074                                 $i = 0;
1075                                 $firstsingleletterword = -1;
1076                                 $firstmultiletterword = -1;
1077                                 $firstspace = -1;
1078                                 foreach ( $arr as $r )
1079                                 {
1080                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1081                                         {
1082                                                 $x1 = substr ($arr[$i-1], -1);
1083                                                 $x2 = substr ($arr[$i-1], -2, 1);
1084                                                 if ($x1 == ' ') {
1085                                                         if ($firstspace == -1) $firstspace = $i;
1086                                                 } else if ($x2 == ' ') {
1087                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1088                                                 } else {
1089                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1090                                                 }
1091                                         }
1092                                         $i++;
1093                                 }
1094
1095                                 # If there is a single-letter word, use it!
1096                                 if ($firstsingleletterword > -1)
1097                                 {
1098                                         $arr [ $firstsingleletterword ] = "''";
1099                                         $arr [ $firstsingleletterword-1 ] .= "'";
1100                                 }
1101                                 # If not, but there's a multi-letter word, use that one.
1102                                 else if ($firstmultiletterword > -1)
1103                                 {
1104                                         $arr [ $firstmultiletterword ] = "''";
1105                                         $arr [ $firstmultiletterword-1 ] .= "'";
1106                                 }
1107                                 # ... otherwise use the first one that has neither.
1108                                 # (notice that it is possible for all three to be -1 if, for example,
1109                                 # there is only one pentuple-apostrophe in the line)
1110                                 else if ($firstspace > -1)
1111                                 {
1112                                         $arr [ $firstspace ] = "''";
1113                                         $arr [ $firstspace-1 ] .= "'";
1114                                 }
1115                         }
1116
1117                         # Now let's actually convert our apostrophic mush to HTML!
1118                         $output = '';
1119                         $buffer = '';
1120                         $state = '';
1121                         $i = 0;
1122                         foreach ($arr as $r)
1123                         {
1124                                 if (($i % 2) == 0)
1125                                 {
1126                                         if ($state == 'both')
1127                                                 $buffer .= $r;
1128                                         else
1129                                                 $output .= $r;
1130                                 }
1131                                 else
1132                                 {
1133                                         if (strlen ($r) == 2)
1134                                         {
1135                                                 if ($state == 'i')
1136                                                 { $output .= '</i>'; $state = ''; }
1137                                                 else if ($state == 'bi')
1138                                                 { $output .= '</i>'; $state = 'b'; }
1139                                                 else if ($state == 'ib')
1140                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1141                                                 else if ($state == 'both')
1142                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1143                                                 else # $state can be 'b' or ''
1144                                                 { $output .= '<i>'; $state .= 'i'; }
1145                                         }
1146                                         else if (strlen ($r) == 3)
1147                                         {
1148                                                 if ($state == 'b')
1149                                                 { $output .= '</b>'; $state = ''; }
1150                                                 else if ($state == 'bi')
1151                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1152                                                 else if ($state == 'ib')
1153                                                 { $output .= '</b>'; $state = 'i'; }
1154                                                 else if ($state == 'both')
1155                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1156                                                 else # $state can be 'i' or ''
1157                                                 { $output .= '<b>'; $state .= 'b'; }
1158                                         }
1159                                         else if (strlen ($r) == 5)
1160                                         {
1161                                                 if ($state == 'b')
1162                                                 { $output .= '</b><i>'; $state = 'i'; }
1163                                                 else if ($state == 'i')
1164                                                 { $output .= '</i><b>'; $state = 'b'; }
1165                                                 else if ($state == 'bi')
1166                                                 { $output .= '</i></b>'; $state = ''; }
1167                                                 else if ($state == 'ib')
1168                                                 { $output .= '</b></i>'; $state = ''; }
1169                                                 else if ($state == 'both')
1170                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1171                                                 else # ($state == '')
1172                                                 { $buffer = ''; $state = 'both'; }
1173                                         }
1174                                 }
1175                                 $i++;
1176                         }
1177                         # Now close all remaining tags.  Notice that the order is important.
1178                         if ($state == 'b' || $state == 'ib')
1179                                 $output .= '</b>';
1180                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1181                                 $output .= '</i>';
1182                         if ($state == 'bi')
1183                                 $output .= '</b>';
1184                         # There might be lonely ''''', so make sure we have a buffer
1185                         if ($state == 'both' && $buffer)
1186                                 $output .= '<b><i>'.$buffer.'</i></b>';
1187                         return $output;
1188                 }
1189         }
1190
1191         /**
1192          * Replace external links
1193          *
1194          * Note: this is all very hackish and the order of execution matters a lot.
1195          * Make sure to run maintenance/parserTests.php if you change this code.
1196          *
1197          * @private
1198          */
1199         function replaceExternalLinks( $text ) {
1200                 global $wgContLang;
1201                 $fname = 'Parser::replaceExternalLinks';
1202                 wfProfileIn( $fname );
1203
1204                 $sk = $this->mOptions->getSkin();
1205
1206                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1207
1208                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1209
1210                 $i = 0;
1211                 while ( $i<count( $bits ) ) {
1212                         $url = $bits[$i++];
1213                         $protocol = $bits[$i++];
1214                         $text = $bits[$i++];
1215                         $trail = $bits[$i++];
1216
1217                         # The characters '<' and '>' (which were escaped by
1218                         # removeHTMLtags()) should not be included in
1219                         # URLs, per RFC 2396.
1220                         $m2 = array();
1221                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1222                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1223                                 $url = substr($url, 0, $m2[0][1]);
1224                         }
1225
1226                         # If the link text is an image URL, replace it with an <img> tag
1227                         # This happened by accident in the original parser, but some people used it extensively
1228                         $img = $this->maybeMakeExternalImage( $text );
1229                         if ( $img !== false ) {
1230                                 $text = $img;
1231                         }
1232
1233                         $dtrail = '';
1234
1235                         # Set linktype for CSS - if URL==text, link is essentially free
1236                         $linktype = ($text == $url) ? 'free' : 'text';
1237
1238                         # No link text, e.g. [http://domain.tld/some.link]
1239                         if ( $text == '' ) {
1240                                 # Autonumber if allowed. See bug #5918
1241                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1242                                         $text = '[' . ++$this->mAutonumber . ']';
1243                                         $linktype = 'autonumber';
1244                                 } else {
1245                                         # Otherwise just use the URL
1246                                         $text = htmlspecialchars( $url );
1247                                         $linktype = 'free';
1248                                 }
1249                         } else {
1250                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1251                                 # Check for trail
1252                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1253                         }
1254
1255                         $text = $wgContLang->markNoConversion($text);
1256
1257                         $url = Sanitizer::cleanUrl( $url );
1258
1259                         # Process the trail (i.e. everything after this link up until start of the next link),
1260                         # replacing any non-bracketed links
1261                         $trail = $this->replaceFreeExternalLinks( $trail );
1262
1263                         # Use the encoded URL
1264                         # This means that users can paste URLs directly into the text
1265                         # Funny characters like &ouml; aren't valid in URLs anyway
1266                         # This was changed in August 2004
1267                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1268
1269                         # Register link in the output object.
1270                         # Replace unnecessary URL escape codes with the referenced character
1271                         # This prevents spammers from hiding links from the filters
1272                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1273                         $this->mOutput->addExternalLink( $pasteurized );
1274                 }
1275
1276                 wfProfileOut( $fname );
1277                 return $s;
1278         }
1279
1280         /**
1281          * Replace anything that looks like a URL with a link
1282          * @private
1283          */
1284         function replaceFreeExternalLinks( $text ) {
1285                 global $wgContLang;
1286                 $fname = 'Parser::replaceFreeExternalLinks';
1287                 wfProfileIn( $fname );
1288
1289                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1290                 $s = array_shift( $bits );
1291                 $i = 0;
1292
1293                 $sk = $this->mOptions->getSkin();
1294
1295                 while ( $i < count( $bits ) ){
1296                         $protocol = $bits[$i++];
1297                         $remainder = $bits[$i++];
1298
1299                         $m = array();
1300                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1301                                 # Found some characters after the protocol that look promising
1302                                 $url = $protocol . $m[1];
1303                                 $trail = $m[2];
1304
1305                                 # special case: handle urls as url args:
1306                                 # http://www.example.com/foo?=http://www.example.com/bar
1307                                 if(strlen($trail) == 0 &&
1308                                         isset($bits[$i]) &&
1309                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1310                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1311                                 {
1312                                         # add protocol, arg
1313                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1314                                         $i += 2;
1315                                         $trail = $m[2];
1316                                 }
1317
1318                                 # The characters '<' and '>' (which were escaped by
1319                                 # removeHTMLtags()) should not be included in
1320                                 # URLs, per RFC 2396.
1321                                 $m2 = array();
1322                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1323                                         $trail = substr($url, $m2[0][1]) . $trail;
1324                                         $url = substr($url, 0, $m2[0][1]);
1325                                 }
1326
1327                                 # Move trailing punctuation to $trail
1328                                 $sep = ',;\.:!?';
1329                                 # If there is no left bracket, then consider right brackets fair game too
1330                                 if ( strpos( $url, '(' ) === false ) {
1331                                         $sep .= ')';
1332                                 }
1333
1334                                 $numSepChars = strspn( strrev( $url ), $sep );
1335                                 if ( $numSepChars ) {
1336                                         $trail = substr( $url, -$numSepChars ) . $trail;
1337                                         $url = substr( $url, 0, -$numSepChars );
1338                                 }
1339
1340                                 $url = Sanitizer::cleanUrl( $url );
1341
1342                                 # Is this an external image?
1343                                 $text = $this->maybeMakeExternalImage( $url );
1344                                 if ( $text === false ) {
1345                                         # Not an image, make a link
1346                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1347                                         # Register it in the output object...
1348                                         # Replace unnecessary URL escape codes with their equivalent characters
1349                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1350                                         $this->mOutput->addExternalLink( $pasteurized );
1351                                 }
1352                                 $s .= $text . $trail;
1353                         } else {
1354                                 $s .= $protocol . $remainder;
1355                         }
1356                 }
1357                 wfProfileOut( $fname );
1358                 return $s;
1359         }
1360
1361         /**
1362          * Replace unusual URL escape codes with their equivalent characters
1363          * @param string
1364          * @return string
1365          * @static
1366          * @todo  This can merge genuinely required bits in the path or query string,
1367          *        breaking legit URLs. A proper fix would treat the various parts of
1368          *        the URL differently; as a workaround, just use the output for
1369          *        statistical records, not for actual linking/output.
1370          */
1371         static function replaceUnusualEscapes( $url ) {
1372                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1373                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1374         }
1375
1376         /**
1377          * Callback function used in replaceUnusualEscapes().
1378          * Replaces unusual URL escape codes with their equivalent character
1379          * @static
1380          * @private
1381          */
1382         private static function replaceUnusualEscapesCallback( $matches ) {
1383                 $char = urldecode( $matches[0] );
1384                 $ord = ord( $char );
1385                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1386                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1387                         // No, shouldn't be escaped
1388                         return $char;
1389                 } else {
1390                         // Yes, leave it escaped
1391                         return $matches[0];
1392                 }
1393         }
1394
1395         /**
1396          * make an image if it's allowed, either through the global
1397          * option or through the exception
1398          * @private
1399          */
1400         function maybeMakeExternalImage( $url ) {
1401                 $sk = $this->mOptions->getSkin();
1402                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1403                 $imagesexception = !empty($imagesfrom);
1404                 $text = false;
1405                 if ( $this->mOptions->getAllowExternalImages()
1406                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1407                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1408                                 # Image found
1409                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1410                         }
1411                 }
1412                 return $text;
1413         }
1414
1415         /**
1416          * Process [[ ]] wikilinks
1417          *
1418          * @private
1419          */
1420         function replaceInternalLinks( $s ) {
1421                 global $wgContLang;
1422                 static $fname = 'Parser::replaceInternalLinks' ;
1423
1424                 wfProfileIn( $fname );
1425
1426                 wfProfileIn( $fname.'-setup' );
1427                 static $tc = FALSE;
1428                 # the % is needed to support urlencoded titles as well
1429                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1430
1431                 $sk = $this->mOptions->getSkin();
1432
1433                 #split the entire text string on occurences of [[
1434                 $a = explode( '[[', ' ' . $s );
1435                 #get the first element (all text up to first [[), and remove the space we added
1436                 $s = array_shift( $a );
1437                 $s = substr( $s, 1 );
1438
1439                 # Match a link having the form [[namespace:link|alternate]]trail
1440                 static $e1 = FALSE;
1441                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1442                 # Match cases where there is no "]]", which might still be images
1443                 static $e1_img = FALSE;
1444                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1445                 # Match the end of a line for a word that's not followed by whitespace,
1446                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1447                 $e2 = wfMsgForContent( 'linkprefix' );
1448
1449                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1450                 if( is_null( $this->mTitle ) ) {
1451                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1452                 }
1453                 $nottalk = !$this->mTitle->isTalkPage();
1454
1455                 if ( $useLinkPrefixExtension ) {
1456                         $m = array();
1457                         if ( preg_match( $e2, $s, $m ) ) {
1458                                 $first_prefix = $m[2];
1459                         } else {
1460                                 $first_prefix = false;
1461                         }
1462                 } else {
1463                         $prefix = '';
1464                 }
1465
1466                 if($wgContLang->hasVariants()) {
1467                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1468                 } else {
1469                         $selflink = array($this->mTitle->getPrefixedText());
1470                 }
1471                 $useSubpages = $this->areSubpagesAllowed();
1472                 wfProfileOut( $fname.'-setup' );
1473
1474                 # Loop for each link
1475                 for ($k = 0; isset( $a[$k] ); $k++) {
1476                         $line = $a[$k];
1477                         if ( $useLinkPrefixExtension ) {
1478                                 wfProfileIn( $fname.'-prefixhandling' );
1479                                 if ( preg_match( $e2, $s, $m ) ) {
1480                                         $prefix = $m[2];
1481                                         $s = $m[1];
1482                                 } else {
1483                                         $prefix='';
1484                                 }
1485                                 # first link
1486                                 if($first_prefix) {
1487                                         $prefix = $first_prefix;
1488                                         $first_prefix = false;
1489                                 }
1490                                 wfProfileOut( $fname.'-prefixhandling' );
1491                         }
1492
1493                         $might_be_img = false;
1494
1495                         wfProfileIn( "$fname-e1" );
1496                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1497                                 $text = $m[2];
1498                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1499                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1500                                 # the real problem is with the $e1 regex
1501                                 # See bug 1300.
1502                                 #
1503                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1504                                 # and no image is in sight. See bug 2095.
1505                                 #
1506                                 if( $text !== '' &&
1507                                         substr( $m[3], 0, 1 ) === ']' &&
1508                                         strpos($text, '[') !== false
1509                                 )
1510                                 {
1511                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1512                                         $m[3] = substr( $m[3], 1 );
1513                                 }
1514                                 # fix up urlencoded title texts
1515                                 if( strpos( $m[1], '%' ) !== false ) {
1516                                         # Should anchors '#' also be rejected?
1517                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1518                                 }
1519                                 $trail = $m[3];
1520                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1521                                 $might_be_img = true;
1522                                 $text = $m[2];
1523                                 if ( strpos( $m[1], '%' ) !== false ) {
1524                                         $m[1] = urldecode($m[1]);
1525                                 }
1526                                 $trail = "";
1527                         } else { # Invalid form; output directly
1528                                 $s .= $prefix . '[[' . $line ;
1529                                 wfProfileOut( "$fname-e1" );
1530                                 continue;
1531                         }
1532                         wfProfileOut( "$fname-e1" );
1533                         wfProfileIn( "$fname-misc" );
1534
1535                         # Don't allow internal links to pages containing
1536                         # PROTO: where PROTO is a valid URL protocol; these
1537                         # should be external links.
1538                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1539                                 $s .= $prefix . '[[' . $line ;
1540                                 continue;
1541                         }
1542
1543                         # Make subpage if necessary
1544                         if( $useSubpages ) {
1545                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1546                         } else {
1547                                 $link = $m[1];
1548                         }
1549
1550                         $noforce = (substr($m[1], 0, 1) != ':');
1551                         if (!$noforce) {
1552                                 # Strip off leading ':'
1553                                 $link = substr($link, 1);
1554                         }
1555
1556                         wfProfileOut( "$fname-misc" );
1557                         wfProfileIn( "$fname-title" );
1558                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1559                         if( !$nt ) {
1560                                 $s .= $prefix . '[[' . $line;
1561                                 wfProfileOut( "$fname-title" );
1562                                 continue;
1563                         }
1564
1565                         $ns = $nt->getNamespace();
1566                         $iw = $nt->getInterWiki();
1567                         wfProfileOut( "$fname-title" );
1568
1569                         if ($might_be_img) { # if this is actually an invalid link
1570                                 wfProfileIn( "$fname-might_be_img" );
1571                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1572                                         $found = false;
1573                                         while (isset ($a[$k+1]) ) {
1574                                                 #look at the next 'line' to see if we can close it there
1575                                                 $spliced = array_splice( $a, $k + 1, 1 );
1576                                                 $next_line = array_shift( $spliced );
1577                                                 $m = explode( ']]', $next_line, 3 );
1578                                                 if ( count( $m ) == 3 ) {
1579                                                         # the first ]] closes the inner link, the second the image
1580                                                         $found = true;
1581                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1582                                                         $trail = $m[2];
1583                                                         break;
1584                                                 } elseif ( count( $m ) == 2 ) {
1585                                                         #if there's exactly one ]] that's fine, we'll keep looking
1586                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1587                                                 } else {
1588                                                         #if $next_line is invalid too, we need look no further
1589                                                         $text .= '[[' . $next_line;
1590                                                         break;
1591                                                 }
1592                                         }
1593                                         if ( !$found ) {
1594                                                 # we couldn't find the end of this imageLink, so output it raw
1595                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1596                                                 $text = $this->replaceInternalLinks($text);
1597                                                 $s .= "{$prefix}[[$link|$text";
1598                                                 # note: no $trail, because without an end, there *is* no trail
1599                                                 wfProfileOut( "$fname-might_be_img" );
1600                                                 continue;
1601                                         }
1602                                 } else { #it's not an image, so output it raw
1603                                         $s .= "{$prefix}[[$link|$text";
1604                                         # note: no $trail, because without an end, there *is* no trail
1605                                         wfProfileOut( "$fname-might_be_img" );
1606                                         continue;
1607                                 }
1608                                 wfProfileOut( "$fname-might_be_img" );
1609                         }
1610
1611                         $wasblank = ( '' == $text );
1612                         if( $wasblank ) $text = $link;
1613
1614                         # Link not escaped by : , create the various objects
1615                         if( $noforce ) {
1616
1617                                 # Interwikis
1618                                 wfProfileIn( "$fname-interwiki" );
1619                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1620                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1621                                         $s = rtrim($s . $prefix);
1622                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1623                                         wfProfileOut( "$fname-interwiki" );
1624                                         continue;
1625                                 }
1626                                 wfProfileOut( "$fname-interwiki" );
1627
1628                                 if ( $ns == NS_IMAGE ) {
1629                                         wfProfileIn( "$fname-image" );
1630                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1631                                                 # recursively parse links inside the image caption
1632                                                 # actually, this will parse them in any other parameters, too,
1633                                                 # but it might be hard to fix that, and it doesn't matter ATM
1634                                                 $text = $this->replaceExternalLinks($text);
1635                                                 $text = $this->replaceInternalLinks($text);
1636
1637                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1638                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1639                                                 $this->mOutput->addImage( $nt->getDBkey() );
1640
1641                                                 wfProfileOut( "$fname-image" );
1642                                                 continue;
1643                                         } else {
1644                                                 # We still need to record the image's presence on the page
1645                                                 $this->mOutput->addImage( $nt->getDBkey() );
1646                                         }
1647                                         wfProfileOut( "$fname-image" );
1648
1649                                 }
1650
1651                                 if ( $ns == NS_CATEGORY ) {
1652                                         wfProfileIn( "$fname-category" );
1653                                         $s = rtrim($s . "\n"); # bug 87
1654
1655                                         if ( $wasblank ) {
1656                                                 $sortkey = $this->getDefaultSort();
1657                                         } else {
1658                                                 $sortkey = $text;
1659                                         }
1660                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1661                                         $sortkey = str_replace( "\n", '', $sortkey );
1662                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1663                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1664
1665                                         /**
1666                                          * Strip the whitespace Category links produce, see bug 87
1667                                          * @todo We might want to use trim($tmp, "\n") here.
1668                                          */
1669                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1670
1671                                         wfProfileOut( "$fname-category" );
1672                                         continue;
1673                                 }
1674                         }
1675
1676                         # Self-link checking
1677                         if( $nt->getFragment() === '' ) {
1678                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1679                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1680                                         continue;
1681                                 }
1682                         }
1683
1684                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1685                         if( $ns == NS_MEDIA ) {
1686                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1687                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1688                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1689                                 $this->mOutput->addImage( $nt->getDBkey() );
1690                                 continue;
1691                         } elseif( $ns == NS_SPECIAL ) {
1692                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1693                                 continue;
1694                         } elseif( $ns == NS_IMAGE ) {
1695                                 $img = new Image( $nt );
1696                                 if( $img->exists() ) {
1697                                         // Force a blue link if the file exists; may be a remote
1698                                         // upload on the shared repository, and we want to see its
1699                                         // auto-generated page.
1700                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1701                                         $this->mOutput->addLink( $nt );
1702                                         continue;
1703                                 }
1704                         }
1705                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1706                 }
1707                 wfProfileOut( $fname );
1708                 return $s;
1709         }
1710
1711         /**
1712          * Make a link placeholder. The text returned can be later resolved to a real link with
1713          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1714          * parsing of interwiki links, and secondly to allow all existence checks and
1715          * article length checks (for stub links) to be bundled into a single query.
1716          *
1717          */
1718         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1719                 wfProfileIn( __METHOD__ );
1720                 if ( ! is_object($nt) ) {
1721                         # Fail gracefully
1722                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1723                 } else {
1724                         # Separate the link trail from the rest of the link
1725                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1726
1727                         if ( $nt->isExternal() ) {
1728                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1729                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1730                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1731                         } else {
1732                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1733                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1734                                 $this->mLinkHolders['queries'][] = $query;
1735                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1736                                 $this->mLinkHolders['titles'][] = $nt;
1737
1738                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1739                         }
1740                 }
1741                 wfProfileOut( __METHOD__ );
1742                 return $retVal;
1743         }
1744
1745         /**
1746          * Render a forced-blue link inline; protect against double expansion of
1747          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1748          * Since this little disaster has to split off the trail text to avoid
1749          * breaking URLs in the following text without breaking trails on the
1750          * wiki links, it's been made into a horrible function.
1751          *
1752          * @param Title $nt
1753          * @param string $text
1754          * @param string $query
1755          * @param string $trail
1756          * @param string $prefix
1757          * @return string HTML-wikitext mix oh yuck
1758          */
1759         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1760                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1761                 $sk = $this->mOptions->getSkin();
1762                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1763                 return $this->armorLinks( $link ) . $trail;
1764         }
1765
1766         /**
1767          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1768          * going to go through further parsing steps before inline URL expansion.
1769          *
1770          * In particular this is important when using action=render, which causes
1771          * full URLs to be included.
1772          *
1773          * Oh man I hate our multi-layer parser!
1774          *
1775          * @param string more-or-less HTML
1776          * @return string less-or-more HTML with NOPARSE bits
1777          */
1778         function armorLinks( $text ) {
1779                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1780                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1781         }
1782
1783         /**
1784          * Return true if subpage links should be expanded on this page.
1785          * @return bool
1786          */
1787         function areSubpagesAllowed() {
1788                 # Some namespaces don't allow subpages
1789                 global $wgNamespacesWithSubpages;
1790                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1791         }
1792
1793         /**
1794          * Handle link to subpage if necessary
1795          * @param string $target the source of the link
1796          * @param string &$text the link text, modified as necessary
1797          * @return string the full name of the link
1798          * @private
1799          */
1800         function maybeDoSubpageLink($target, &$text) {
1801                 # Valid link forms:
1802                 # Foobar -- normal
1803                 # :Foobar -- override special treatment of prefix (images, language links)
1804                 # /Foobar -- convert to CurrentPage/Foobar
1805                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1806                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1807                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1808
1809                 $fname = 'Parser::maybeDoSubpageLink';
1810                 wfProfileIn( $fname );
1811                 $ret = $target; # default return value is no change
1812
1813                 # bug 7425
1814                 $target = trim( $target );
1815
1816                 # Some namespaces don't allow subpages,
1817                 # so only perform processing if subpages are allowed
1818                 if( $this->areSubpagesAllowed() ) {
1819                         # Look at the first character
1820                         if( $target != '' && $target{0} == '/' ) {
1821                                 # / at end means we don't want the slash to be shown
1822                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1823                                 if( $trailingSlashes ) {
1824                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1825                                 } else {
1826                                         $noslash = substr( $target, 1 );
1827                                 }
1828
1829                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1830                                 if( '' === $text ) {
1831                                         $text = $target;
1832                                 } # this might be changed for ugliness reasons
1833                         } else {
1834                                 # check for .. subpage backlinks
1835                                 $dotdotcount = 0;
1836                                 $nodotdot = $target;
1837                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1838                                         ++$dotdotcount;
1839                                         $nodotdot = substr( $nodotdot, 3 );
1840                                 }
1841                                 if($dotdotcount > 0) {
1842                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1843                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1844                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1845                                                 # / at the end means don't show full path
1846                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1847                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1848                                                         if( '' === $text ) {
1849                                                                 $text = $nodotdot;
1850                                                         }
1851                                                 }
1852                                                 $nodotdot = trim( $nodotdot );
1853                                                 if( $nodotdot != '' ) {
1854                                                         $ret .= '/' . $nodotdot;
1855                                                 }
1856                                         }
1857                                 }
1858                         }
1859                 }
1860
1861                 wfProfileOut( $fname );
1862                 return $ret;
1863         }
1864
1865         /**#@+
1866          * Used by doBlockLevels()
1867          * @private
1868          */
1869         /* private */ function closeParagraph() {
1870                 $result = '';
1871                 if ( '' != $this->mLastSection ) {
1872                         $result = '</' . $this->mLastSection  . ">\n";
1873                 }
1874                 $this->mInPre = false;
1875                 $this->mLastSection = '';
1876                 return $result;
1877         }
1878         # getCommon() returns the length of the longest common substring
1879         # of both arguments, starting at the beginning of both.
1880         #
1881         /* private */ function getCommon( $st1, $st2 ) {
1882                 $fl = strlen( $st1 );
1883                 $shorter = strlen( $st2 );
1884                 if ( $fl < $shorter ) { $shorter = $fl; }
1885
1886                 for ( $i = 0; $i < $shorter; ++$i ) {
1887                         if ( $st1{$i} != $st2{$i} ) { break; }
1888                 }
1889                 return $i;
1890         }
1891         # These next three functions open, continue, and close the list
1892         # element appropriate to the prefix character passed into them.
1893         #
1894         /* private */ function openList( $char ) {
1895                 $result = $this->closeParagraph();
1896
1897                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1898                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1899                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1900                 else if ( ';' == $char ) {
1901                         $result .= '<dl><dt>';
1902                         $this->mDTopen = true;
1903                 }
1904                 else { $result = '<!-- ERR 1 -->'; }
1905
1906                 return $result;
1907         }
1908
1909         /* private */ function nextItem( $char ) {
1910                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1911                 else if ( ':' == $char || ';' == $char ) {
1912                         $close = '</dd>';
1913                         if ( $this->mDTopen ) { $close = '</dt>'; }
1914                         if ( ';' == $char ) {
1915                                 $this->mDTopen = true;
1916                                 return $close . '<dt>';
1917                         } else {
1918                                 $this->mDTopen = false;
1919                                 return $close . '<dd>';
1920                         }
1921                 }
1922                 return '<!-- ERR 2 -->';
1923         }
1924
1925         /* private */ function closeList( $char ) {
1926                 if ( '*' == $char ) { $text = '</li></ul>'; }
1927                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1928                 else if ( ':' == $char ) {
1929                         if ( $this->mDTopen ) {
1930                                 $this->mDTopen = false;
1931                                 $text = '</dt></dl>';
1932                         } else {
1933                                 $text = '</dd></dl>';
1934                         }
1935                 }
1936                 else {  return '<!-- ERR 3 -->'; }
1937                 return $text."\n";
1938         }
1939         /**#@-*/
1940
1941         /**
1942          * Make lists from lines starting with ':', '*', '#', etc.
1943          *
1944          * @private
1945          * @return string the lists rendered as HTML
1946          */
1947         function doBlockLevels( $text, $linestart ) {
1948                 $fname = 'Parser::doBlockLevels';
1949                 wfProfileIn( $fname );
1950
1951                 # Parsing through the text line by line.  The main thing
1952                 # happening here is handling of block-level elements p, pre,
1953                 # and making lists from lines starting with * # : etc.
1954                 #
1955                 $textLines = explode( "\n", $text );
1956
1957                 $lastPrefix = $output = '';
1958                 $this->mDTopen = $inBlockElem = false;
1959                 $prefixLength = 0;
1960                 $paragraphStack = false;
1961
1962                 if ( !$linestart ) {
1963                         $output .= array_shift( $textLines );
1964                 }
1965                 foreach ( $textLines as $oLine ) {
1966                         $lastPrefixLength = strlen( $lastPrefix );
1967                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1968                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1969                         if ( !$this->mInPre ) {
1970                                 # Multiple prefixes may abut each other for nested lists.
1971                                 $prefixLength = strspn( $oLine, '*#:;' );
1972                                 $pref = substr( $oLine, 0, $prefixLength );
1973
1974                                 # eh?
1975                                 $pref2 = str_replace( ';', ':', $pref );
1976                                 $t = substr( $oLine, $prefixLength );
1977                                 $this->mInPre = !empty($preOpenMatch);
1978                         } else {
1979                                 # Don't interpret any other prefixes in preformatted text
1980                                 $prefixLength = 0;
1981                                 $pref = $pref2 = '';
1982                                 $t = $oLine;
1983                         }
1984
1985                         # List generation
1986                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
1987                                 # Same as the last item, so no need to deal with nesting or opening stuff
1988                                 $output .= $this->nextItem( substr( $pref, -1 ) );
1989                                 $paragraphStack = false;
1990
1991                                 if ( substr( $pref, -1 ) == ';') {
1992                                         # The one nasty exception: definition lists work like this:
1993                                         # ; title : definition text
1994                                         # So we check for : in the remainder text to split up the
1995                                         # title and definition, without b0rking links.
1996                                         $term = $t2 = '';
1997                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
1998                                                 $t = $t2;
1999                                                 $output .= $term . $this->nextItem( ':' );
2000                                         }
2001                                 }
2002                         } elseif( $prefixLength || $lastPrefixLength ) {
2003                                 # Either open or close a level...
2004                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2005                                 $paragraphStack = false;
2006
2007                                 while( $commonPrefixLength < $lastPrefixLength ) {
2008                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2009                                         --$lastPrefixLength;
2010                                 }
2011                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2012                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2013                                 }
2014                                 while ( $prefixLength > $commonPrefixLength ) {
2015                                         $char = substr( $pref, $commonPrefixLength, 1 );
2016                                         $output .= $this->openList( $char );
2017
2018                                         if ( ';' == $char ) {
2019                                                 # FIXME: This is dupe of code above
2020                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2021                                                         $t = $t2;
2022                                                         $output .= $term . $this->nextItem( ':' );
2023                                                 }
2024                                         }
2025                                         ++$commonPrefixLength;
2026                                 }
2027                                 $lastPrefix = $pref2;
2028                         }
2029                         if( 0 == $prefixLength ) {
2030                                 wfProfileIn( "$fname-paragraph" );
2031                                 # No prefix (not in list)--go to paragraph mode
2032                                 // XXX: use a stack for nestable elements like span, table and div
2033                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2034                                 $closematch = preg_match(
2035                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2036                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2037                                 if ( $openmatch or $closematch ) {
2038                                         $paragraphStack = false;
2039                                         # TODO bug 5718: paragraph closed
2040                                         $output .= $this->closeParagraph();
2041                                         if ( $preOpenMatch and !$preCloseMatch ) {
2042                                                 $this->mInPre = true;
2043                                         }
2044                                         if ( $closematch ) {
2045                                                 $inBlockElem = false;
2046                                         } else {
2047                                                 $inBlockElem = true;
2048                                         }
2049                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2050                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2051                                                 // pre
2052                                                 if ($this->mLastSection != 'pre') {
2053                                                         $paragraphStack = false;
2054                                                         $output .= $this->closeParagraph().'<pre>';
2055                                                         $this->mLastSection = 'pre';
2056                                                 }
2057                                                 $t = substr( $t, 1 );
2058                                         } else {
2059                                                 // paragraph
2060                                                 if ( '' == trim($t) ) {
2061                                                         if ( $paragraphStack ) {
2062                                                                 $output .= $paragraphStack.'<br />';
2063                                                                 $paragraphStack = false;
2064                                                                 $this->mLastSection = 'p';
2065                                                         } else {
2066                                                                 if ($this->mLastSection != 'p' ) {
2067                                                                         $output .= $this->closeParagraph();
2068                                                                         $this->mLastSection = '';
2069                                                                         $paragraphStack = '<p>';
2070                                                                 } else {
2071                                                                         $paragraphStack = '</p><p>';
2072                                                                 }
2073                                                         }
2074                                                 } else {
2075                                                         if ( $paragraphStack ) {
2076                                                                 $output .= $paragraphStack;
2077                                                                 $paragraphStack = false;
2078                                                                 $this->mLastSection = 'p';
2079                                                         } else if ($this->mLastSection != 'p') {
2080                                                                 $output .= $this->closeParagraph().'<p>';
2081                                                                 $this->mLastSection = 'p';
2082                                                         }
2083                                                 }
2084                                         }
2085                                 }
2086                                 wfProfileOut( "$fname-paragraph" );
2087                         }
2088                         // somewhere above we forget to get out of pre block (bug 785)
2089                         if($preCloseMatch && $this->mInPre) {
2090                                 $this->mInPre = false;
2091                         }
2092                         if ($paragraphStack === false) {
2093                                 $output .= $t."\n";
2094                         }
2095                 }
2096                 while ( $prefixLength ) {
2097                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2098                         --$prefixLength;
2099                 }
2100                 if ( '' != $this->mLastSection ) {
2101                         $output .= '</' . $this->mLastSection . '>';
2102                         $this->mLastSection = '';
2103                 }
2104
2105                 wfProfileOut( $fname );
2106                 return $output;
2107         }
2108
2109         /**
2110          * Split up a string on ':', ignoring any occurences inside tags
2111          * to prevent illegal overlapping.
2112          * @param string $str the string to split
2113          * @param string &$before set to everything before the ':'
2114          * @param string &$after set to everything after the ':'
2115          * return string the position of the ':', or false if none found
2116          */
2117         function findColonNoLinks($str, &$before, &$after) {
2118                 $fname = 'Parser::findColonNoLinks';
2119                 wfProfileIn( $fname );
2120
2121                 $pos = strpos( $str, ':' );
2122                 if( $pos === false ) {
2123                         // Nothing to find!
2124                         wfProfileOut( $fname );
2125                         return false;
2126                 }
2127
2128                 $lt = strpos( $str, '<' );
2129                 if( $lt === false || $lt > $pos ) {
2130                         // Easy; no tag nesting to worry about
2131                         $before = substr( $str, 0, $pos );
2132                         $after = substr( $str, $pos+1 );
2133                         wfProfileOut( $fname );
2134                         return $pos;
2135                 }
2136
2137                 // Ugly state machine to walk through avoiding tags.
2138                 $state = MW_COLON_STATE_TEXT;
2139                 $stack = 0;
2140                 $len = strlen( $str );
2141                 for( $i = 0; $i < $len; $i++ ) {
2142                         $c = $str{$i};
2143
2144                         switch( $state ) {
2145                         // (Using the number is a performance hack for common cases)
2146                         case 0: // MW_COLON_STATE_TEXT:
2147                                 switch( $c ) {
2148                                 case "<":
2149                                         // Could be either a <start> tag or an </end> tag
2150                                         $state = MW_COLON_STATE_TAGSTART;
2151                                         break;
2152                                 case ":":
2153                                         if( $stack == 0 ) {
2154                                                 // We found it!
2155                                                 $before = substr( $str, 0, $i );
2156                                                 $after = substr( $str, $i + 1 );
2157                                                 wfProfileOut( $fname );
2158                                                 return $i;
2159                                         }
2160                                         // Embedded in a tag; don't break it.
2161                                         break;
2162                                 default:
2163                                         // Skip ahead looking for something interesting
2164                                         $colon = strpos( $str, ':', $i );
2165                                         if( $colon === false ) {
2166                                                 // Nothing else interesting
2167                                                 wfProfileOut( $fname );
2168                                                 return false;
2169                                         }
2170                                         $lt = strpos( $str, '<', $i );
2171                                         if( $stack === 0 ) {
2172                                                 if( $lt === false || $colon < $lt ) {
2173                                                         // We found it!
2174                                                         $before = substr( $str, 0, $colon );
2175                                                         $after = substr( $str, $colon + 1 );
2176                                                         wfProfileOut( $fname );
2177                                                         return $i;
2178                                                 }
2179                                         }
2180                                         if( $lt === false ) {
2181                                                 // Nothing else interesting to find; abort!
2182                                                 // We're nested, but there's no close tags left. Abort!
2183                                                 break 2;
2184                                         }
2185                                         // Skip ahead to next tag start
2186                                         $i = $lt;
2187                                         $state = MW_COLON_STATE_TAGSTART;
2188                                 }
2189                                 break;
2190                         case 1: // MW_COLON_STATE_TAG:
2191                                 // In a <tag>
2192                                 switch( $c ) {
2193                                 case ">":
2194                                         $stack++;
2195                                         $state = MW_COLON_STATE_TEXT;
2196                                         break;
2197                                 case "/":
2198                                         // Slash may be followed by >?
2199                                         $state = MW_COLON_STATE_TAGSLASH;
2200                                         break;
2201                                 default:
2202                                         // ignore
2203                                 }
2204                                 break;
2205                         case 2: // MW_COLON_STATE_TAGSTART:
2206                                 switch( $c ) {
2207                                 case "/":
2208                                         $state = MW_COLON_STATE_CLOSETAG;
2209                                         break;
2210                                 case "!":
2211                                         $state = MW_COLON_STATE_COMMENT;
2212                                         break;
2213                                 case ">":
2214                                         // Illegal early close? This shouldn't happen D:
2215                                         $state = MW_COLON_STATE_TEXT;
2216                                         break;
2217                                 default:
2218                                         $state = MW_COLON_STATE_TAG;
2219                                 }
2220                                 break;
2221                         case 3: // MW_COLON_STATE_CLOSETAG:
2222                                 // In a </tag>
2223                                 if( $c == ">" ) {
2224                                         $stack--;
2225                                         if( $stack < 0 ) {
2226                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2227                                                 wfProfileOut( $fname );
2228                                                 return false;
2229                                         }
2230                                         $state = MW_COLON_STATE_TEXT;
2231                                 }
2232                                 break;
2233                         case MW_COLON_STATE_TAGSLASH:
2234                                 if( $c == ">" ) {
2235                                         // Yes, a self-closed tag <blah/>
2236                                         $state = MW_COLON_STATE_TEXT;
2237                                 } else {
2238                                         // Probably we're jumping the gun, and this is an attribute
2239                                         $state = MW_COLON_STATE_TAG;
2240                                 }
2241                                 break;
2242                         case 5: // MW_COLON_STATE_COMMENT:
2243                                 if( $c == "-" ) {
2244                                         $state = MW_COLON_STATE_COMMENTDASH;
2245                                 }
2246                                 break;
2247                         case MW_COLON_STATE_COMMENTDASH:
2248                                 if( $c == "-" ) {
2249                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2250                                 } else {
2251                                         $state = MW_COLON_STATE_COMMENT;
2252                                 }
2253                                 break;
2254                         case MW_COLON_STATE_COMMENTDASHDASH:
2255                                 if( $c == ">" ) {
2256                                         $state = MW_COLON_STATE_TEXT;
2257                                 } else {
2258                                         $state = MW_COLON_STATE_COMMENT;
2259                                 }
2260                                 break;
2261                         default:
2262                                 throw new MWException( "State machine error in $fname" );
2263                         }
2264                 }
2265                 if( $stack > 0 ) {
2266                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2267                         return false;
2268                 }
2269                 wfProfileOut( $fname );
2270                 return false;
2271         }
2272
2273         /**
2274          * Return value of a magic variable (like PAGENAME)
2275          *
2276          * @private
2277          */
2278         function getVariableValue( $index ) {
2279                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2280
2281                 /**
2282                  * Some of these require message or data lookups and can be
2283                  * expensive to check many times.
2284                  */
2285                 static $varCache = array();
2286                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2287                         if ( isset( $varCache[$index] ) ) {
2288                                 return $varCache[$index];
2289                         }
2290                 }
2291
2292                 $ts = time();
2293                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2294
2295                 # Use the time zone
2296                 global $wgLocaltimezone;
2297                 if ( isset( $wgLocaltimezone ) ) {
2298                         $oldtz = getenv( 'TZ' );
2299                         putenv( 'TZ='.$wgLocaltimezone );
2300                 }
2301                 $localTimestamp = date( 'YmdHis', $ts );
2302                 $localMonth = date( 'm', $ts );
2303                 $localMonthName = date( 'n', $ts );
2304                 $localDay = date( 'j', $ts );
2305                 $localDay2 = date( 'd', $ts );
2306                 $localDayOfWeek = date( 'w', $ts );
2307                 $localWeek = date( 'W', $ts );
2308                 $localYear = date( 'Y', $ts );
2309                 $localHour = date( 'H', $ts );
2310                 if ( isset( $wgLocaltimezone ) ) {
2311                         putenv( 'TZ='.$oldtz );
2312                 }
2313
2314                 switch ( $index ) {
2315                         case 'currentmonth':
2316                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2317                         case 'currentmonthname':
2318                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2319                         case 'currentmonthnamegen':
2320                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2321                         case 'currentmonthabbrev':
2322                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2323                         case 'currentday':
2324                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2325                         case 'currentday2':
2326                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2327                         case 'localmonth':
2328                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2329                         case 'localmonthname':
2330                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2331                         case 'localmonthnamegen':
2332                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2333                         case 'localmonthabbrev':
2334                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2335                         case 'localday':
2336                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2337                         case 'localday2':
2338                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2339                         case 'pagename':
2340                                 return $this->mTitle->getText();
2341                         case 'pagenamee':
2342                                 return $this->mTitle->getPartialURL();
2343                         case 'fullpagename':
2344                                 return $this->mTitle->getPrefixedText();
2345                         case 'fullpagenamee':
2346                                 return $this->mTitle->getPrefixedURL();
2347                         case 'subpagename':
2348                                 return $this->mTitle->getSubpageText();
2349                         case 'subpagenamee':
2350                                 return $this->mTitle->getSubpageUrlForm();
2351                         case 'basepagename':
2352                                 return $this->mTitle->getBaseText();
2353                         case 'basepagenamee':
2354                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2355                         case 'talkpagename':
2356                                 if( $this->mTitle->canTalk() ) {
2357                                         $talkPage = $this->mTitle->getTalkPage();
2358                                         return $talkPage->getPrefixedText();
2359                                 } else {
2360                                         return '';
2361                                 }
2362                         case 'talkpagenamee':
2363                                 if( $this->mTitle->canTalk() ) {
2364                                         $talkPage = $this->mTitle->getTalkPage();
2365                                         return $talkPage->getPrefixedUrl();
2366                                 } else {
2367                                         return '';
2368                                 }
2369                         case 'subjectpagename':
2370                                 $subjPage = $this->mTitle->getSubjectPage();
2371                                 return $subjPage->getPrefixedText();
2372                         case 'subjectpagenamee':
2373                                 $subjPage = $this->mTitle->getSubjectPage();
2374                                 return $subjPage->getPrefixedUrl();
2375                         case 'revisionid':
2376                                 return $this->mRevisionId;
2377                         case 'revisionday':
2378                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2379                         case 'revisionday2':
2380                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2381                         case 'revisionmonth':
2382                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2383                         case 'revisionyear':
2384                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2385                         case 'revisiontimestamp':
2386                                 return $this->getRevisionTimestamp();
2387                         case 'namespace':
2388                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2389                         case 'namespacee':
2390                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2391                         case 'talkspace':
2392                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2393                         case 'talkspacee':
2394                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2395                         case 'subjectspace':
2396                                 return $this->mTitle->getSubjectNsText();
2397                         case 'subjectspacee':
2398                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2399                         case 'currentdayname':
2400                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2401                         case 'currentyear':
2402                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2403                         case 'currenttime':
2404                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2405                         case 'currenthour':
2406                                 return $varCache[$index] = $wgContLang->formatNum( date( 'H', $ts ), true );
2407                         case 'currentweek':
2408                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2409                                 // int to remove the padding
2410                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2411                         case 'currentdow':
2412                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2413                         case 'localdayname':
2414                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2415                         case 'localyear':
2416                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2417                         case 'localtime':
2418                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2419                         case 'localhour':
2420                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2421                         case 'localweek':
2422                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2423                                 // int to remove the padding
2424                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2425                         case 'localdow':
2426                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2427                         case 'numberofarticles':
2428                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2429                         case 'numberoffiles':
2430                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2431                         case 'numberofusers':
2432                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2433                         case 'numberofpages':
2434                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2435                         case 'numberofadmins':
2436                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2437                         case 'numberofedits':
2438                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::edits() );
2439                         case 'currenttimestamp':
2440                                 return $varCache[$index] = wfTimestampNow();
2441                         case 'localtimestamp':
2442                                 return $varCache[$index] = $localTimestamp;
2443                         case 'currentversion':
2444                                 return $varCache[$index] = SpecialVersion::getVersion();
2445                         case 'sitename':
2446                                 return $wgSitename;
2447                         case 'server':
2448                                 return $wgServer;
2449                         case 'servername':
2450                                 return $wgServerName;
2451                         case 'scriptpath':
2452                                 return $wgScriptPath;
2453                         case 'directionmark':
2454                                 return $wgContLang->getDirMark();
2455                         case 'contentlanguage':
2456                                 global $wgContLanguageCode;
2457                                 return $wgContLanguageCode;
2458                         default:
2459                                 $ret = null;
2460                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2461                                         return $ret;
2462                                 else
2463                                         return null;
2464                 }
2465         }
2466
2467         /**
2468          * initialise the magic variables (like CURRENTMONTHNAME)
2469          *
2470          * @private
2471          */
2472         function initialiseVariables() {
2473                 $fname = 'Parser::initialiseVariables';
2474                 wfProfileIn( $fname );
2475                 $variableIDs = MagicWord::getVariableIDs();
2476
2477                 $this->mVariables = array();
2478                 foreach ( $variableIDs as $id ) {
2479                         $mw =& MagicWord::get( $id );
2480                         $mw->addToArray( $this->mVariables, $id );
2481                 }
2482                 wfProfileOut( $fname );
2483         }
2484
2485         /**
2486          * parse any parentheses in format ((title|part|part))
2487          * and call callbacks to get a replacement text for any found piece
2488          *
2489          * @param string $text The text to parse
2490          * @param array $callbacks rules in form:
2491          *     '{' => array(                            # opening parentheses
2492          *                                      'end' => '}',   # closing parentheses
2493          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2494          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2495          *                                                                )
2496          *                                      )
2497          *                                      'min' => 2,     # Minimum parenthesis count in cb
2498          *                                      'max' => 3,     # Maximum parenthesis count in cb
2499          * @private
2500          */
2501         function replace_callback ($text, $callbacks) {
2502                 wfProfileIn( __METHOD__ );
2503                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2504                 $lastOpeningBrace = -1;                 # last not closed parentheses
2505
2506                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2507
2508                 $i = 0;
2509                 while ( $i < strlen( $text ) ) {
2510                         # Find next opening brace, closing brace or pipe
2511                         if ( $lastOpeningBrace == -1 ) {
2512                                 $currentClosing = '';
2513                                 $search = $validOpeningBraces;
2514                         } else {
2515                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2516                                 $search = $validOpeningBraces . '|' . $currentClosing;
2517                         }
2518                         $rule = null;
2519                         $i += strcspn( $text, $search, $i );
2520                         if ( $i < strlen( $text ) ) {
2521                                 if ( $text[$i] == '|' ) {
2522                                         $found = 'pipe';
2523                                 } elseif ( $text[$i] == $currentClosing ) {
2524                                         $found = 'close';
2525                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2526                                         $found = 'open';
2527                                         $rule = $callbacks[$text[$i]];
2528                                 } else {
2529                                         # Some versions of PHP have a strcspn which stops on null characters
2530                                         # Ignore and continue
2531                                         ++$i;
2532                                         continue;
2533                                 }
2534                         } else {
2535                                 # All done
2536                                 break;
2537                         }
2538
2539                         if ( $found == 'open' ) {
2540                                 # found opening brace, let's add it to parentheses stack
2541                                 $piece = array('brace' => $text[$i],
2542                                                            'braceEnd' => $rule['end'],
2543                                                            'title' => '',
2544                                                            'parts' => null);
2545
2546                                 # count opening brace characters
2547                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2548                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2549                                 $i += $piece['count'];
2550
2551                                 # we need to add to stack only if opening brace count is enough for one of the rules
2552                                 if ( $piece['count'] >= $rule['min'] ) {
2553                                         $lastOpeningBrace ++;
2554                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2555                                 }
2556                         } elseif ( $found == 'close' ) {
2557                                 # lets check if it is enough characters for closing brace
2558                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2559                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2560
2561                                 # check for maximum matching characters (if there are 5 closing
2562                                 # characters, we will probably need only 3 - depending on the rules)
2563                                 $matchingCount = 0;
2564                                 $matchingCallback = null;
2565                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2566                                 if ( $count > $cbType['max'] ) {
2567                                         # The specified maximum exists in the callback array, unless the caller
2568                                         # has made an error
2569                                         $matchingCount = $cbType['max'];
2570                                 } else {
2571                                         # Count is less than the maximum
2572                                         # Skip any gaps in the callback array to find the true largest match
2573                                         # Need to use array_key_exists not isset because the callback can be null
2574                                         $matchingCount = $count;
2575                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2576                                                 --$matchingCount;
2577                                         }
2578                                 }
2579
2580                                 if ($matchingCount <= 0) {
2581                                         $i += $count;
2582                                         continue;
2583                                 }
2584                                 $matchingCallback = $cbType['cb'][$matchingCount];
2585
2586                                 # let's set a title or last part (if '|' was found)
2587                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2588                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2589                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2590                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2591                                 } else {
2592                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2593                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2594                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2595                                 }
2596
2597                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2598                                 $pieceEnd = $i + $matchingCount;
2599
2600                                 if( is_callable( $matchingCallback ) ) {
2601                                         $cbArgs = array (
2602                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2603                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2604                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2605                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2606                                                                          );
2607                                         # finally we can call a user callback and replace piece of text
2608                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2609                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2610                                         $i = $pieceStart + strlen($replaceWith);
2611                                 } else {
2612                                         # null value for callback means that parentheses should be parsed, but not replaced
2613                                         $i += $matchingCount;
2614                                 }
2615
2616                                 # reset last opening parentheses, but keep it in case there are unused characters
2617                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2618                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2619                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2620                                                            'title' => '',
2621                                                            'parts' => null,
2622                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2623                                 $openingBraceStack[$lastOpeningBrace--] = null;
2624
2625                                 if ($matchingCount < $piece['count']) {
2626                                         $piece['count'] -= $matchingCount;
2627                                         $piece['startAt'] -= $matchingCount;
2628                                         $piece['partStart'] = $piece['startAt'];
2629                                         # do we still qualify for any callback with remaining count?
2630                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2631                                         while ( $piece['count'] ) {
2632                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2633                                                         $lastOpeningBrace++;
2634                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2635                                                         break;
2636                                                 }
2637                                                 --$piece['count'];
2638                                         }
2639                                 }
2640                         } elseif ( $found == 'pipe' ) {
2641                                 # lets set a title if it is a first separator, or next part otherwise
2642                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2643                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2644                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2645                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2646                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2647                                 } else {
2648                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2649                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2650                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2651                                 }
2652                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2653                         }
2654                 }
2655
2656                 wfProfileOut( __METHOD__ );
2657                 return $text;
2658         }
2659
2660         /**
2661          * Replace magic variables, templates, and template arguments
2662          * with the appropriate text. Templates are substituted recursively,
2663          * taking care to avoid infinite loops.
2664          *
2665          * Note that the substitution depends on value of $mOutputType:
2666          *  OT_WIKI: only {{subst:}} templates
2667          *  OT_MSG: only magic variables
2668          *  OT_HTML: all templates and magic variables
2669          *
2670          * @param string $tex The text to transform
2671          * @param array $args Key-value pairs representing template parameters to substitute
2672          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2673          * @private
2674          */
2675         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2676                 # Prevent too big inclusions
2677                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2678                         return $text;
2679                 }
2680
2681                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2682                 wfProfileIn( $fname );
2683
2684                 # This function is called recursively. To keep track of arguments we need a stack:
2685                 array_push( $this->mArgStack, $args );
2686
2687                 $braceCallbacks = array();
2688                 if ( !$argsOnly ) {
2689                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2690                 }
2691                 if ( $this->mOutputType != OT_MSG ) {
2692                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2693                 }
2694                 if ( $braceCallbacks ) {
2695                         $callbacks = array(
2696                                 '{' => array(
2697                                         'end' => '}',
2698                                         'cb' => $braceCallbacks,
2699                                         'min' => $argsOnly ? 3 : 2,
2700                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2701                                 ),
2702                                 '[' => array(
2703                                         'end' => ']',
2704                                         'cb' => array(2=>null),
2705                                         'min' => 2,
2706                                         'max' => 2,
2707                                 )
2708                         );
2709                         $text = $this->replace_callback ($text, $callbacks);
2710
2711                         array_pop( $this->mArgStack );
2712                 }
2713                 wfProfileOut( $fname );
2714                 return $text;
2715         }
2716
2717         /**
2718          * Replace magic variables
2719          * @private
2720          */
2721         function variableSubstitution( $matches ) {
2722                 global $wgContLang;
2723                 $fname = 'Parser::variableSubstitution';
2724                 $varname = $wgContLang->lc($matches[1]);
2725                 wfProfileIn( $fname );
2726                 $skip = false;
2727                 if ( $this->mOutputType == OT_WIKI ) {
2728                         # Do only magic variables prefixed by SUBST
2729                         $mwSubst =& MagicWord::get( 'subst' );
2730                         if (!$mwSubst->matchStartAndRemove( $varname ))
2731                                 $skip = true;
2732                         # Note that if we don't substitute the variable below,
2733                         # we don't remove the {{subst:}} magic word, in case
2734                         # it is a template rather than a magic variable.
2735                 }
2736                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2737                         $id = $this->mVariables[$varname];
2738                         # Now check if we did really match, case sensitive or not
2739                         $mw =& MagicWord::get( $id );
2740                         if ($mw->match($matches[1])) {
2741                                 $text = $this->getVariableValue( $id );
2742                                 $this->mOutput->mContainsOldMagic = true;
2743                         } else {
2744                                 $text = $matches[0];
2745                         }
2746                 } else {
2747                         $text = $matches[0];
2748                 }
2749                 wfProfileOut( $fname );
2750                 return $text;
2751         }
2752
2753
2754         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2755         static function createAssocArgs( $args ) {
2756                 $assocArgs = array();
2757                 $index = 1;
2758                 foreach( $args as $arg ) {
2759                         $eqpos = strpos( $arg, '=' );
2760                         if ( $eqpos === false ) {
2761                                 $assocArgs[$index++] = $arg;
2762                         } else {
2763                                 $name = trim( substr( $arg, 0, $eqpos ) );
2764                                 $value = trim( substr( $arg, $eqpos+1 ) );
2765                                 if ( $value === false ) {
2766                                         $value = '';
2767                                 }
2768                                 if ( $name !== false ) {
2769                                         $assocArgs[$name] = $value;
2770                                 }
2771                         }
2772                 }
2773
2774                 return $assocArgs;
2775         }
2776
2777         /**
2778          * Return the text of a template, after recursively
2779          * replacing any variables or templates within the template.
2780          *
2781          * @param array $piece The parts of the template
2782          *  $piece['text']: matched text
2783          *  $piece['title']: the title, i.e. the part before the |
2784          *  $piece['parts']: the parameter array
2785          * @return string the text of the template
2786          * @private
2787          */
2788         function braceSubstitution( $piece ) {
2789                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2790                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2791                 wfProfileIn( $fname );
2792                 wfProfileIn( __METHOD__.'-setup' );
2793
2794                 # Flags
2795                 $found = false;             # $text has been filled
2796                 $nowiki = false;            # wiki markup in $text should be escaped
2797                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2798                 $noargs = false;            # Don't replace triple-brace arguments in $text
2799                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2800                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2801                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2802                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2803
2804                 # Title object, where $text came from
2805                 $title = NULL;
2806
2807                 $linestart = '';
2808
2809
2810                 # $part1 is the bit before the first |, and must contain only title characters
2811                 # $args is a list of arguments, starting from index 0, not including $part1
2812
2813                 $titleText = $part1 = $piece['title'];
2814                 # If the third subpattern matched anything, it will start with |
2815
2816                 if (null == $piece['parts']) {
2817                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2818                         if ($replaceWith != $piece['text']) {
2819                                 $text = $replaceWith;
2820                                 $found = true;
2821                                 $noparse = true;
2822                                 $noargs = true;
2823                         }
2824                 }
2825
2826                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2827                 wfProfileOut( __METHOD__.'-setup' );
2828
2829                 # SUBST
2830                 wfProfileIn( __METHOD__.'-modifiers' );
2831                 if ( !$found ) {
2832                         $mwSubst =& MagicWord::get( 'subst' );
2833                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2834                                 # One of two possibilities is true:
2835                                 # 1) Found SUBST but not in the PST phase
2836                                 # 2) Didn't find SUBST and in the PST phase
2837                                 # In either case, return without further processing
2838                                 $text = $piece['text'];
2839                                 $found = true;
2840                                 $noparse = true;
2841                                 $noargs = true;
2842                         }
2843                 }
2844
2845                 # MSG, MSGNW and RAW
2846                 if ( !$found ) {
2847                         # Check for MSGNW:
2848                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2849                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2850                                 $nowiki = true;
2851                         } else {
2852                                 # Remove obsolete MSG:
2853                                 $mwMsg =& MagicWord::get( 'msg' );
2854                                 $mwMsg->matchStartAndRemove( $part1 );
2855                         }
2856
2857                         # Check for RAW:
2858                         $mwRaw =& MagicWord::get( 'raw' );
2859                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2860                                 $forceRawInterwiki = true;
2861                         }
2862                 }
2863                 wfProfileOut( __METHOD__.'-modifiers' );
2864
2865                 //save path level before recursing into functions & templates.
2866                 $lastPathLevel = $this->mTemplatePath;
2867
2868                 # Parser functions
2869                 if ( !$found ) {
2870                         wfProfileIn( __METHOD__ . '-pfunc' );
2871
2872                         $colonPos = strpos( $part1, ':' );
2873                         if ( $colonPos !== false ) {
2874                                 # Case sensitive functions
2875                                 $function = substr( $part1, 0, $colonPos );
2876                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2877                                         $function = $this->mFunctionSynonyms[1][$function];
2878                                 } else {
2879                                         # Case insensitive functions
2880                                         $function = strtolower( $function );
2881                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2882                                                 $function = $this->mFunctionSynonyms[0][$function];
2883                                         } else {
2884                                                 $function = false;
2885                                         }
2886                                 }
2887                                 if ( $function ) {
2888                                         $funcArgs = array_map( 'trim', $args );
2889                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2890                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2891                                         $found = true;
2892
2893                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2894                                         //$noargs = true;
2895                                         //$noparse = true;
2896
2897                                         if ( is_array( $result ) ) {
2898                                                 if ( isset( $result[0] ) ) {
2899                                                         $text = $linestart . $result[0];
2900                                                         unset( $result[0] );
2901                                                 }
2902
2903                                                 // Extract flags into the local scope
2904                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2905                                                 extract( $result );
2906                                         } else {
2907                                                 $text = $linestart . $result;
2908                                         }
2909                                 }
2910                         }
2911                         wfProfileOut( __METHOD__ . '-pfunc' );
2912                 }
2913
2914                 # Template table test
2915
2916                 # Did we encounter this template already? If yes, it is in the cache
2917                 # and we need to check for loops.
2918                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2919                         $found = true;
2920
2921                         # Infinite loop test
2922                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2923                                 $noparse = true;
2924                                 $noargs = true;
2925                                 $found = true;
2926                                 $text = $linestart .
2927                                         "[[$part1]]<!-- WARNING: template loop detected -->";
2928                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
2929                         } else {
2930                                 # set $text to cached message.
2931                                 $text = $linestart . $this->mTemplates[$piece['title']];
2932                                 #treat title for cached page the same as others
2933                                 $ns = NS_TEMPLATE;
2934                                 $subpage = '';
2935                                 $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2936                                 if ($subpage !== '') {
2937                                   $ns = $this->mTitle->getNamespace();
2938                                 }
2939                                 $title = Title::newFromText( $part1, $ns );
2940                                 //used by include size checking
2941                                 $titleText = $title->getPrefixedText();
2942                                 //used by edit section links
2943                                 $replaceHeadings = true;
2944
2945                         }
2946                 }
2947
2948                 # Load from database
2949                 if ( !$found ) {
2950                         wfProfileIn( __METHOD__ . '-loadtpl' );
2951                         $ns = NS_TEMPLATE;
2952                         # declaring $subpage directly in the function call
2953                         # does not work correctly with references and breaks
2954                         # {{/subpage}}-style inclusions
2955                         $subpage = '';
2956                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2957                         if ($subpage !== '') {
2958                                 $ns = $this->mTitle->getNamespace();
2959                         }
2960                         $title = Title::newFromText( $part1, $ns );
2961
2962
2963                         if ( !is_null( $title ) ) {
2964                                 $titleText = $title->getPrefixedText();
2965                                 # Check for language variants if the template is not found
2966                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2967                                         $wgContLang->findVariantLink($part1, $title);
2968                                 }
2969
2970                                 if ( !$title->isExternal() ) {
2971                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2972                                                 $text = SpecialPage::capturePath( $title );
2973                                                 if ( is_string( $text ) ) {
2974                                                         $found = true;
2975                                                         $noparse = true;
2976                                                         $noargs = true;
2977                                                         $isHTML = true;
2978                                                         $this->disableCache();
2979                                                 }
2980                                         } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2981                                                 $found = false; //access denied
2982                                                 wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
2983                                         } else {
2984                                                 $articleContent = $this->fetchTemplate( $title );
2985                                                 if ( $articleContent !== false ) {
2986                                                         $found = true;
2987                                                         $text = $articleContent;
2988                                                         $replaceHeadings = true;
2989                                                 }
2990                                         }
2991
2992                                         # If the title is valid but undisplayable, make a link to it
2993                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2994                                                 $text = "[[:$titleText]]";
2995                                                 $found = true;
2996                                         }
2997                                 } elseif ( $title->isTrans() ) {
2998                                         // Interwiki transclusion
2999                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3000                                                 $text = $this->interwikiTransclude( $title, 'render' );
3001                                                 $isHTML = true;
3002                                                 $noparse = true;
3003                                         } else {
3004                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3005                                                 $replaceHeadings = true;
3006                                         }
3007                                         $found = true;
3008                                 }
3009
3010                                 # Template cache array insertion
3011                                 # Use the original $piece['title'] not the mangled $part1, so that
3012                                 # modifiers such as RAW: produce separate cache entries
3013                                 if( $found ) {
3014                                         if( $isHTML ) {
3015                                                 // A special page; don't store it in the template cache.
3016                                         } else {
3017                                                 $this->mTemplates[$piece['title']] = $text;
3018                                         }
3019                                         $text = $linestart . $text;
3020                                 }
3021                         }
3022                         wfProfileOut( __METHOD__ . '-loadtpl' );
3023                 }
3024
3025                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3026                         # Error, oversize inclusion
3027                         $text = $linestart .
3028                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3029                         $noparse = true;
3030                         $noargs = true;
3031                 }
3032
3033                 # Recursive parsing, escaping and link table handling
3034                 # Only for HTML output
3035                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3036                         $text = wfEscapeWikiText( $text );
3037                 } elseif ( !$this->ot['msg'] && $found ) {
3038                         if ( $noargs ) {
3039                                 $assocArgs = array();
3040                         } else {
3041                                 # Clean up argument array
3042                                 $assocArgs = self::createAssocArgs($args);
3043                                 # Add a new element to the templace recursion path
3044                                 $this->mTemplatePath[$part1] = 1;
3045                         }
3046
3047                         if ( !$noparse ) {
3048                                 # If there are any <onlyinclude> tags, only include them
3049                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3050                                         $replacer = new OnlyIncludeReplacer;
3051                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3052                                                 array( &$replacer, 'replace' ), $text );
3053                                         $text = $replacer->output;
3054                                 }
3055                                 # Remove <noinclude> sections and <includeonly> tags
3056                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3057                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3058
3059                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3060                                         # Strip <nowiki>, <pre>, etc.
3061                                         $text = $this->strip( $text, $this->mStripState );
3062                                         if ( $this->ot['html'] ) {
3063                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3064                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3065                                                 $text = Sanitizer::removeHTMLcomments( $text );
3066                                         }
3067                                 }
3068                                 $text = $this->replaceVariables( $text, $assocArgs );
3069
3070                                 # If the template begins with a table or block-level
3071                                 # element, it should be treated as beginning a new line.
3072                                 if (!$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3073                                         $text = "\n" . $text;
3074                                 }
3075                         } elseif ( !$noargs ) {
3076                                 # $noparse and !$noargs
3077                                 # Just replace the arguments, not any double-brace items
3078                                 # This is used for rendered interwiki transclusion
3079                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3080                         }
3081                 }
3082                 # Prune lower levels off the recursion check path
3083                 $this->mTemplatePath = $lastPathLevel;
3084
3085                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3086                         # Error, oversize inclusion
3087                         $text = $linestart .
3088                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3089                         $noparse = true;
3090                         $noargs = true;
3091                 }
3092
3093                 if ( !$found ) {
3094                         wfProfileOut( $fname );
3095                         return $piece['text'];
3096                 } else {
3097                         wfProfileIn( __METHOD__ . '-placeholders' );
3098                         if ( $isHTML ) {
3099                                 # Replace raw HTML by a placeholder
3100                                 # Add a blank line preceding, to prevent it from mucking up
3101                                 # immediately preceding headings
3102                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3103                         } else {
3104                                 # replace ==section headers==
3105                                 # XXX this needs to go away once we have a better parser.
3106                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3107                                         if( !is_null( $title ) )
3108                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3109                                         else
3110                                                 $encodedname = base64_encode("");
3111                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3112                                                 PREG_SPLIT_DELIM_CAPTURE);
3113                                         $text = '';
3114                                         $nsec = $headingOffset;
3115                                         for( $i = 0; $i < count($m); $i += 2 ) {
3116                                                 $text .= $m[$i];
3117                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3118                                                 $hl = $m[$i + 1];
3119                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3120                                                         $text .= $hl;
3121                                                         continue;
3122                                                 }
3123                                                 $m2 = array();
3124                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3125                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3126                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3127
3128                                                 $nsec++;
3129                                         }
3130                                 }
3131                         }
3132                         wfProfileOut( __METHOD__ . '-placeholders' );
3133                 }
3134
3135                 # Prune lower levels off the recursion check path
3136                 $this->mTemplatePath = $lastPathLevel;
3137
3138                 if ( !$found ) {
3139                         wfProfileOut( $fname );
3140                         return $piece['text'];
3141                 } else {
3142                         wfProfileOut( $fname );
3143                         return $text;
3144                 }
3145         }
3146
3147         /**
3148          * Fetch the unparsed text of a template and register a reference to it.
3149          */
3150         function fetchTemplate( $title ) {
3151                 $text = false;
3152                 // Loop to fetch the article, with up to 1 redirect
3153                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3154                         $rev = Revision::newFromTitle( $title );
3155                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3156                         if ( $rev ) {
3157                                 $text = $rev->getText();
3158                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3159                                 global $wgLang;
3160                                 $message = $wgLang->lcfirst( $title->getText() );
3161                                 $text = wfMsgForContentNoTrans( $message );
3162                                 if( wfEmptyMsg( $message, $text ) ) {
3163                                         $text = false;
3164                                         break;
3165                                 }
3166                         } else {
3167                                 break;
3168                         }
3169                         if ( $text === false ) {
3170                                 break;
3171                         }
3172                         // Redirect?
3173                         $title = Title::newFromRedirect( $text );
3174                 }
3175                 return $text;
3176         }
3177
3178         /**
3179          * Transclude an interwiki link.
3180          */
3181         function interwikiTransclude( $title, $action ) {
3182                 global $wgEnableScaryTranscluding;
3183
3184                 if (!$wgEnableScaryTranscluding)
3185                         return wfMsg('scarytranscludedisabled');
3186
3187                 $url = $title->getFullUrl( "action=$action" );
3188
3189                 if (strlen($url) > 255)
3190                         return wfMsg('scarytranscludetoolong');
3191                 return $this->fetchScaryTemplateMaybeFromCache($url);
3192         }
3193
3194         function fetchScaryTemplateMaybeFromCache($url) {
3195                 global $wgTranscludeCacheExpiry;
3196                 $dbr = wfGetDB(DB_SLAVE);
3197                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3198                                 array('tc_url' => $url));
3199                 if ($obj) {
3200                         $time = $obj->tc_time;
3201                         $text = $obj->tc_contents;
3202                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3203                                 return $text;
3204                         }
3205                 }
3206
3207                 $text = Http::get($url);
3208                 if (!$text)
3209                         return wfMsg('scarytranscludefailed', $url);
3210
3211                 $dbw = wfGetDB(DB_MASTER);
3212                 $dbw->replace('transcache', array('tc_url'), array(
3213                         'tc_url' => $url,
3214                         'tc_time' => time(),
3215                         'tc_contents' => $text));
3216                 return $text;
3217         }
3218
3219
3220         /**
3221          * Triple brace replacement -- used for template arguments
3222          * @private
3223          */
3224         function argSubstitution( $matches ) {
3225                 $arg = trim( $matches['title'] );
3226                 $text = $matches['text'];
3227                 $inputArgs = end( $this->mArgStack );
3228
3229                 if ( array_key_exists( $arg, $inputArgs ) ) {
3230                         $text = $inputArgs[$arg];
3231                 } else if (($this->mOutputType == OT_HTML || $this->mOutputType == OT_PREPROCESS ) &&
3232                 null != $matches['parts'] && count($matches['parts']) > 0) {
3233                         $text = $matches['parts'][0];
3234                 }
3235                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3236                         $text = $matches['text'] .
3237                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3238                 }
3239
3240                 return $text;
3241         }
3242
3243         /**
3244          * Increment an include size counter
3245          *
3246          * @param string $type The type of expansion
3247          * @param integer $size The size of the text
3248          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3249          */
3250         function incrementIncludeSize( $type, $size ) {
3251                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3252                         return false;
3253                 } else {
3254                         $this->mIncludeSizes[$type] += $size;
3255                         return true;
3256                 }
3257         }
3258
3259         /**
3260          * Detect __NOGALLERY__ magic word and set a placeholder
3261          */
3262         function stripNoGallery( &$text ) {
3263                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3264                 # do not add TOC
3265                 $mw = MagicWord::get( 'nogallery' );
3266                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3267         }
3268
3269         /**
3270          * Detect __TOC__ magic word and set a placeholder
3271          */
3272         function stripToc( $text ) {
3273                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3274                 # do not add TOC
3275                 $mw = MagicWord::get( 'notoc' );
3276                 if( $mw->matchAndRemove( $text ) ) {
3277                         $this->mShowToc = false;
3278                 }
3279
3280                 $mw = MagicWord::get( 'toc' );
3281                 if( $mw->match( $text ) ) {
3282                         $this->mShowToc = true;
3283                         $this->mForceTocPosition = true;
3284
3285                         // Set a placeholder. At the end we'll fill it in with the TOC.
3286                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3287
3288                         // Only keep the first one.
3289                         $text = $mw->replace( '', $text );
3290                 }
3291                 return $text;
3292         }
3293
3294         /**
3295          * This function accomplishes several tasks:
3296          * 1) Auto-number headings if that option is enabled
3297          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3298          * 3) Add a Table of contents on the top for users who have enabled the option
3299          * 4) Auto-anchor headings
3300          *
3301          * It loops through all headlines, collects the necessary data, then splits up the
3302          * string and re-inserts the newly formatted headlines.
3303          *
3304          * @param string $text
3305          * @param boolean $isMain
3306          * @private
3307          */
3308         function formatHeadings( $text, $isMain=true ) {
3309                 global $wgMaxTocLevel, $wgContLang;
3310
3311                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3312                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3313                         $showEditLink = 0;
3314                 } else {
3315                         $showEditLink = $this->mOptions->getEditSection();
3316                 }
3317
3318                 # Inhibit editsection links if requested in the page
3319                 $esw =& MagicWord::get( 'noeditsection' );
3320                 if( $esw->matchAndRemove( $text ) ) {
3321                         $showEditLink = 0;
3322                 }
3323
3324                 # Get all headlines for numbering them and adding funky stuff like [edit]
3325                 # links - this is for later, but we need the number of headlines right now
3326                 $matches = array();
3327                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3328
3329                 # if there are fewer than 4 headlines in the article, do not show TOC
3330                 # unless it's been explicitly enabled.
3331                 $enoughToc = $this->mShowToc &&
3332                         (($numMatches >= 4) || $this->mForceTocPosition);
3333
3334                 # Allow user to stipulate that a page should have a "new section"
3335                 # link added via __NEWSECTIONLINK__
3336                 $mw =& MagicWord::get( 'newsectionlink' );
3337                 if( $mw->matchAndRemove( $text ) )
3338                         $this->mOutput->setNewSection( true );
3339
3340                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3341                 # override above conditions and always show TOC above first header
3342                 $mw =& MagicWord::get( 'forcetoc' );
3343                 if ($mw->matchAndRemove( $text ) ) {
3344                         $this->mShowToc = true;
3345                         $enoughToc = true;
3346                 }
3347
3348                 # Never ever show TOC if no headers
3349                 if( $numMatches < 1 ) {
3350                         $enoughToc = false;
3351                 }
3352
3353                 # We need this to perform operations on the HTML
3354                 $sk = $this->mOptions->getSkin();
3355
3356                 # headline counter
3357                 $headlineCount = 0;
3358                 $sectionCount = 0; # headlineCount excluding template sections
3359
3360                 # Ugh .. the TOC should have neat indentation levels which can be
3361                 # passed to the skin functions. These are determined here
3362                 $toc = '';
3363                 $full = '';
3364                 $head = array();
3365                 $sublevelCount = array();
3366                 $levelCount = array();
3367                 $toclevel = 0;
3368                 $level = 0;
3369                 $prevlevel = 0;
3370                 $toclevel = 0;
3371                 $prevtoclevel = 0;
3372
3373                 foreach( $matches[3] as $headline ) {
3374                         $istemplate = 0;
3375                         $templatetitle = '';
3376                         $templatesection = 0;
3377                         $numbering = '';
3378                         $mat = array();
3379                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3380                                 $istemplate = 1;
3381                                 $templatetitle = base64_decode($mat[1]);
3382                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3383                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3384                         }
3385
3386                         if( $toclevel ) {
3387                                 $prevlevel = $level;
3388                                 $prevtoclevel = $toclevel;
3389                         }
3390                         $level = $matches[1][$headlineCount];
3391
3392                         if( $doNumberHeadings || $enoughToc ) {
3393
3394                                 if ( $level > $prevlevel ) {
3395                                         # Increase TOC level
3396                                         $toclevel++;
3397                                         $sublevelCount[$toclevel] = 0;
3398                                         if( $toclevel<$wgMaxTocLevel ) {
3399                                                 $toc .= $sk->tocIndent();
3400                                         }
3401                                 }
3402                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3403                                         # Decrease TOC level, find level to jump to
3404
3405                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3406                                                 # Can only go down to level 1
3407                                                 $toclevel = 1;
3408                                         } else {
3409                                                 for ($i = $toclevel; $i > 0; $i--) {
3410                                                         if ( $levelCount[$i] == $level ) {
3411                                                                 # Found last matching level
3412                                                                 $toclevel = $i;
3413                                                                 break;
3414                                                         }
3415                                                         elseif ( $levelCount[$i] < $level ) {
3416                                                                 # Found first matching level below current level
3417                                                                 $toclevel = $i + 1;
3418                                                                 break;
3419                                                         }
3420                                                 }
3421                                         }
3422                                         if( $toclevel<$wgMaxTocLevel ) {
3423                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3424                                         }
3425                                 }
3426                                 else {
3427                                         # No change in level, end TOC line
3428                                         if( $toclevel<$wgMaxTocLevel ) {
3429                                                 $toc .= $sk->tocLineEnd();
3430                                         }
3431                                 }
3432
3433                                 $levelCount[$toclevel] = $level;
3434
3435                                 # count number of headlines for each level
3436                                 @$sublevelCount[$toclevel]++;
3437                                 $dot = 0;
3438                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3439                                         if( !empty( $sublevelCount[$i] ) ) {
3440                                                 if( $dot ) {
3441                                                         $numbering .= '.';
3442                                                 }
3443                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3444                                                 $dot = 1;
3445                                         }
3446                                 }
3447                         }
3448
3449                         # The canonized header is a version of the header text safe to use for links
3450                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3451                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3452
3453                         # Remove link placeholders by the link text.
3454                         #     <!--LINK number-->
3455                         # turns into
3456                         #     link text with suffix
3457                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3458                                                             "\$this->mLinkHolders['texts'][\$1]",
3459                                                             $canonized_headline );
3460                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3461                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3462                                                             $canonized_headline );
3463
3464                         # strip out HTML
3465                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3466                         $tocline = trim( $canonized_headline );
3467                         # Save headline for section edit hint before it's escaped
3468                         $headline_hint = trim( $canonized_headline );
3469                         $canonized_headline = Sanitizer::escapeId( $tocline );
3470                         $refers[$headlineCount] = $canonized_headline;
3471
3472                         # count how many in assoc. array so we can track dupes in anchors
3473                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3474                         $refcount[$headlineCount]=$refers[$canonized_headline];
3475
3476                         # Don't number the heading if it is the only one (looks silly)
3477                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3478                                 # the two are different if the line contains a link
3479                                 $headline=$numbering . ' ' . $headline;
3480                         }
3481
3482                         # Create the anchor for linking from the TOC to the section
3483                         $anchor = $canonized_headline;
3484                         if($refcount[$headlineCount] > 1 ) {
3485                                 $anchor .= '_' . $refcount[$headlineCount];
3486                         }
3487                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3488                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3489                         }
3490                         # give headline the correct <h#> tag
3491                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3492                                 if( $istemplate )
3493                                         $editlink = $sk->editSectionLinkForOther($templatetitle, $templatesection);
3494                                 else
3495                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3496                         } else {
3497                                 $editlink = '';
3498                         }
3499                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3500
3501                         $headlineCount++;
3502                         if( !$istemplate )
3503                                 $sectionCount++;
3504                 }
3505
3506                 if( $enoughToc ) {
3507                         if( $toclevel<$wgMaxTocLevel ) {
3508                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3509                         }
3510                         $toc = $sk->tocList( $toc );
3511                 }
3512
3513                 # split up and insert constructed headlines
3514
3515                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3516                 $i = 0;
3517
3518                 foreach( $blocks as $block ) {
3519                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3520                                 # This is the [edit] link that appears for the top block of text when
3521                                 # section editing is enabled
3522
3523                                 # Disabled because it broke block formatting
3524                                 # For example, a bullet point in the top line
3525                                 # $full .= $sk->editSectionLink(0);
3526                         }
3527                         $full .= $block;
3528                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3529                                 # Top anchor now in skin
3530                                 $full = $full.$toc;
3531                         }
3532
3533                         if( !empty( $head[$i] ) ) {
3534                                 $full .= $head[$i];
3535                         }
3536                         $i++;
3537                 }
3538                 if( $this->mForceTocPosition ) {
3539                         return str_replace( '<!--MWTOC-->', $toc, $full );
3540                 } else {
3541                         return $full;
3542                 }
3543         }
3544
3545         /**
3546          * Transform wiki markup when saving a page by doing \r\n -> \n
3547          * conversion, substitting signatures, {{subst:}} templates, etc.
3548          *
3549          * @param string $text the text to transform
3550          * @param Title &$title the Title object for the current article
3551          * @param User &$user the User object describing the current user
3552          * @param ParserOptions $options parsing options
3553          * @param bool $clearState whether to clear the parser state first
3554          * @return string the altered wiki markup
3555          * @public
3556          */
3557         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3558                 $this->mOptions = $options;
3559                 $this->mTitle =& $title;
3560                 $this->setOutputType( OT_WIKI );
3561
3562                 if ( $clearState ) {
3563                         $this->clearState();
3564                 }
3565
3566                 $stripState = new StripState;
3567                 $pairs = array(
3568                         "\r\n" => "\n",
3569                 );
3570                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3571                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3572                 $text = $this->pstPass2( $text, $stripState, $user );
3573                 $text = $stripState->unstripBoth( $text );
3574                 return $text;
3575         }
3576
3577         /**
3578          * Pre-save transform helper function
3579          * @private
3580          */
3581         function pstPass2( $text, &$stripState, $user ) {
3582                 global $wgContLang, $wgLocaltimezone;
3583
3584                 /* Note: This is the timestamp saved as hardcoded wikitext to
3585                  * the database, we use $wgContLang here in order to give
3586                  * everyone the same signature and use the default one rather
3587                  * than the one selected in each user's preferences.
3588                  */
3589                 if ( isset( $wgLocaltimezone ) ) {
3590                         $oldtz = getenv( 'TZ' );
3591                         putenv( 'TZ='.$wgLocaltimezone );
3592                 }
3593                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3594                   ' (' . date( 'T' ) . ')';
3595                 if ( isset( $wgLocaltimezone ) ) {
3596                         putenv( 'TZ='.$oldtz );
3597                 }
3598
3599                 # Variable replacement
3600                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3601                 $text = $this->replaceVariables( $text );
3602
3603                 # Strip out <nowiki> etc. added via replaceVariables
3604                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3605
3606                 # Signatures
3607                 $sigText = $this->getUserSig( $user );
3608                 $text = strtr( $text, array(
3609                         '~~~~~' => $d,
3610                         '~~~~' => "$sigText $d",
3611                         '~~~' => $sigText
3612                 ) );
3613
3614                 # Context links: [[|name]] and [[name (context)|]]
3615                 #
3616                 global $wgLegalTitleChars;
3617                 $tc = "[$wgLegalTitleChars]";
3618                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3619
3620                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3621                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3622                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3623
3624                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3625                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3626                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3627
3628                 $t = $this->mTitle->getText();
3629                 $m = array();
3630                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3631                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3632                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3633                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3634                 } else {
3635                         # if there's no context, don't bother duplicating the title
3636                         $text = preg_replace( $p2, '[[\\1]]', $text );
3637                 }
3638
3639                 # Trim trailing whitespace
3640                 $text = rtrim( $text );
3641
3642                 return $text;
3643         }
3644
3645         /**
3646          * Fetch the user's signature text, if any, and normalize to
3647          * validated, ready-to-insert wikitext.
3648          *
3649          * @param User $user
3650          * @return string
3651          * @private
3652          */
3653         function getUserSig( &$user ) {
3654                 $username = $user->getName();
3655                 $nickname = $user->getOption( 'nickname' );
3656                 $nickname = $nickname === '' ? $username : $nickname;
3657
3658                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3659                         # Sig. might contain markup; validate this
3660                         if( $this->validateSig( $nickname ) !== false ) {
3661                                 # Validated; clean up (if needed) and return it
3662                                 return $this->cleanSig( $nickname, true );
3663                         } else {
3664                                 # Failed to validate; fall back to the default
3665                                 $nickname = $username;
3666                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3667                         }
3668                 }
3669
3670                 // Make sure nickname doesnt get a sig in a sig
3671                 $nickname = $this->cleanSigInSig( $nickname );
3672
3673                 # If we're still here, make it a link to the user page
3674                 $userpage = $user->getUserPage();
3675                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3676         }
3677
3678         /**
3679          * Check that the user's signature contains no bad XML
3680          *
3681          * @param string $text
3682          * @return mixed An expanded string, or false if invalid.
3683          */
3684         function validateSig( $text ) {
3685                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3686         }
3687
3688         /**
3689          * Clean up signature text
3690          *
3691          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3692          * 2) Substitute all transclusions
3693          *
3694          * @param string $text
3695          * @param $parsing Whether we're cleaning (preferences save) or parsing
3696          * @return string Signature text
3697          */
3698         function cleanSig( $text, $parsing = false ) {
3699                 global $wgTitle;
3700                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3701
3702                 $substWord = MagicWord::get( 'subst' );
3703                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3704                 $substText = '{{' . $substWord->getSynonym( 0 );
3705
3706                 $text = preg_replace( $substRegex, $substText, $text );
3707                 $text = $this->cleanSigInSig( $text );
3708                 $text = $this->replaceVariables( $text );
3709
3710                 $this->clearState();
3711                 return $text;
3712         }
3713
3714         /**
3715          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3716          * @param string $text
3717          * @return string Signature text with /~{3,5}/ removed
3718          */
3719         function cleanSigInSig( $text ) {
3720                 $text = preg_replace( '/~{3,5}/', '', $text );
3721                 return $text;
3722         }
3723
3724         /**
3725          * Set up some variables which are usually set up in parse()
3726          * so that an external function can call some class members with confidence
3727          * @public
3728          */
3729         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3730                 $this->mTitle =& $title;
3731                 $this->mOptions = $options;
3732                 $this->setOutputType( $outputType );
3733                 if ( $clearState ) {
3734                         $this->clearState();
3735                 }
3736         }
3737
3738         /**
3739          * Transform a MediaWiki message by replacing magic variables.
3740          *
3741          * @param string $text the text to transform
3742          * @param ParserOptions $options  options
3743          * @return string the text with variables substituted
3744          * @public
3745          */
3746         function transformMsg( $text, $options ) {
3747                 global $wgTitle;
3748                 static $executing = false;
3749
3750                 $fname = "Parser::transformMsg";
3751
3752                 # Guard against infinite recursion
3753                 if ( $executing ) {
3754                         return $text;
3755                 }
3756                 $executing = true;
3757
3758                 wfProfileIn($fname);
3759
3760                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
3761                         $this->mTitle = $wgTitle;
3762                 } else {
3763                         $this->mTitle = Title::newFromText('msg');
3764                 }
3765                 $this->mOptions = $options;
3766                 $this->setOutputType( OT_MSG );
3767                 $this->clearState();
3768                 $text = $this->replaceVariables( $text );
3769
3770                 $executing = false;
3771                 wfProfileOut($fname);
3772                 return $text;
3773         }
3774
3775         /**
3776          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3777          * The callback should have the following form:
3778          *    function myParserHook( $text, $params, &$parser ) { ... }
3779          *
3780          * Transform and return $text. Use $parser for any required context, e.g. use
3781          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3782          *
3783          * @public
3784          *
3785          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3786          * @param mixed $callback The callback function (and object) to use for the tag
3787          *
3788          * @return The old value of the mTagHooks array associated with the hook
3789          */
3790         function setHook( $tag, $callback ) {
3791                 $tag = strtolower( $tag );
3792                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3793                 $this->mTagHooks[$tag] = $callback;
3794
3795                 return $oldVal;
3796         }
3797
3798         /**
3799          * Create a function, e.g. {{sum:1|2|3}}
3800          * The callback function should have the form:
3801          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3802          *
3803          * The callback may either return the text result of the function, or an array with the text
3804          * in element 0, and a number of flags in the other elements. The names of the flags are
3805          * specified in the keys. Valid flags are:
3806          *   found                     The text returned is valid, stop processing the template. This
3807          *                             is on by default.
3808          *   nowiki                    Wiki markup in the return value should be escaped
3809          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3810          *   noargs                    Don't replace triple-brace arguments in the return value
3811          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3812          *
3813          * @public
3814          *
3815          * @param string $id The magic word ID
3816          * @param mixed $callback The callback function (and object) to use
3817          * @param integer $flags a combination of the following flags:
3818          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3819          *
3820          * @return The old callback function for this name, if any
3821          */
3822         function setFunctionHook( $id, $callback, $flags = 0 ) {
3823                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
3824                 $this->mFunctionHooks[$id] = $callback;
3825
3826                 # Add to function cache
3827                 $mw = MagicWord::get( $id );
3828                 if( !$mw )
3829                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3830
3831                 $synonyms = $mw->getSynonyms();
3832                 $sensitive = intval( $mw->isCaseSensitive() );
3833
3834                 foreach ( $synonyms as $syn ) {
3835                         # Case
3836                         if ( !$sensitive ) {
3837                                 $syn = strtolower( $syn );
3838                         }
3839                         # Add leading hash
3840                         if ( !( $flags & SFH_NO_HASH ) ) {
3841                                 $syn = '#' . $syn;
3842                         }
3843                         # Remove trailing colon
3844                         if ( substr( $syn, -1, 1 ) == ':' ) {
3845                                 $syn = substr( $syn, 0, -1 );
3846                         }
3847                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3848                 }
3849                 return $oldVal;
3850         }
3851
3852         /**
3853          * Get all registered function hook identifiers
3854          *
3855          * @return array
3856          */
3857         function getFunctionHooks() {
3858                 return array_keys( $this->mFunctionHooks );
3859         }
3860
3861         /**
3862          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3863          * Placeholders created in Skin::makeLinkObj()
3864          * Returns an array of links found, indexed by PDBK:
3865          *  0 - broken
3866          *  1 - normal link
3867          *  2 - stub
3868          * $options is a bit field, RLH_FOR_UPDATE to select for update
3869          */
3870         function replaceLinkHolders( &$text, $options = 0 ) {
3871                 global $wgUser;
3872                 global $wgContLang;
3873
3874                 $fname = 'Parser::replaceLinkHolders';
3875                 wfProfileIn( $fname );
3876
3877                 $pdbks = array();
3878                 $colours = array();
3879                 $sk = $this->mOptions->getSkin();
3880                 $linkCache =& LinkCache::singleton();
3881
3882                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3883                         wfProfileIn( $fname.'-check' );
3884                         $dbr = wfGetDB( DB_SLAVE );
3885                         $page = $dbr->tableName( 'page' );
3886                         $threshold = $wgUser->getOption('stubthreshold');
3887
3888                         # Sort by namespace
3889                         asort( $this->mLinkHolders['namespaces'] );
3890
3891                         # Generate query
3892                         $query = false;
3893                         $current = null;
3894                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3895                                 # Make title object
3896                                 $title = $this->mLinkHolders['titles'][$key];
3897
3898                                 # Skip invalid entries.
3899                                 # Result will be ugly, but prevents crash.
3900                                 if ( is_null( $title ) ) {
3901                                         continue;
3902                                 }
3903                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3904
3905                                 # Check if it's a static known link, e.g. interwiki
3906                                 if ( $title->isAlwaysKnown() ) {
3907                                         $colours[$pdbk] = 1;
3908                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3909                                         $colours[$pdbk] = 1;
3910                                         $this->mOutput->addLink( $title, $id );
3911                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3912                                         $colours[$pdbk] = 0;
3913                                 } else {
3914                                         # Not in the link cache, add it to the query
3915                                         if ( !isset( $current ) ) {
3916                                                 $current = $ns;
3917                                                 $query =  "SELECT page_id, page_namespace, page_title";
3918                                                 if ( $threshold > 0 ) {
3919                                                         $query .= ', page_len, page_is_redirect';
3920                                                 }
3921                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3922                                         } elseif ( $current != $ns ) {
3923                                                 $current = $ns;
3924                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3925                                         } else {
3926                                                 $query .= ', ';
3927                                         }
3928
3929                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
3930                                 }
3931                         }
3932                         if ( $query ) {
3933                                 $query .= '))';
3934                                 if ( $options & RLH_FOR_UPDATE ) {
3935                                         $query .= ' FOR UPDATE';
3936                                 }
3937
3938                                 $res = $dbr->query( $query, $fname );
3939
3940                                 # Fetch data and form into an associative array
3941                                 # non-existent = broken
3942                                 # 1 = known
3943                                 # 2 = stub
3944                                 while ( $s = $dbr->fetchObject($res) ) {
3945                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
3946                                         $pdbk = $title->getPrefixedDBkey();
3947                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
3948                                         $this->mOutput->addLink( $title, $s->page_id );
3949
3950                                         if ( $threshold >  0 ) {
3951                                                 $size = $s->page_len;
3952                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
3953                                                         $colours[$pdbk] = 1;
3954                                                 } else {
3955                                                         $colours[$pdbk] = 2;
3956                                                 }
3957                                         } else {
3958                                                 $colours[$pdbk] = 1;
3959                                         }
3960                                 }
3961                         }
3962                         wfProfileOut( $fname.'-check' );
3963
3964                         # Do a second query for different language variants of links and categories
3965                         if($wgContLang->hasVariants()){
3966                                 $linkBatch = new LinkBatch();
3967                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
3968                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
3969                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
3970
3971                                 $categories = $this->mOutput->getCategoryLinks();
3972
3973                                 // Add variants of links to link batch
3974                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3975                                         $title = $this->mLinkHolders['titles'][$key];
3976                                         if ( is_null( $title ) )
3977                                                 continue;
3978
3979                                         $pdbk = $title->getPrefixedDBkey();
3980                                         $titleText = $title->getText();
3981
3982                                         // generate all variants of the link title text
3983                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
3984
3985                                         // if link was not found (in first query), add all variants to query
3986                                         if ( !isset($colours[$pdbk]) ){
3987                                                 foreach($allTextVariants as $textVariant){
3988                                                         if($textVariant != $titleText){
3989                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
3990                                                                 if(is_null($variantTitle)) continue;
3991                                                                 $linkBatch->addObj( $variantTitle );
3992                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
3993                                                         }
3994                                                 }
3995                                         }
3996                                 }
3997
3998                                 // process categories, check if a category exists in some variant
3999                                 foreach( $categories as $category){
4000                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4001                                         foreach($variants as $variant){
4002                                                 if($variant != $category){
4003                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4004                                                         if(is_null($variantTitle)) continue;
4005                                                         $linkBatch->addObj( $variantTitle );
4006                                                         $categoryMap[$variant] = $category;
4007                                                 }
4008                                         }
4009                                 }
4010
4011
4012                                 if(!$linkBatch->isEmpty()){
4013                                         // construct query
4014                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4015
4016                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4017                                         if ( $threshold > 0 ) {
4018                                                 $variantQuery .= ', page_len, page_is_redirect';
4019                                         }
4020
4021                                         $variantQuery .= " FROM $page WHERE $titleClause";
4022                                         if ( $options & RLH_FOR_UPDATE ) {
4023                                                 $variantQuery .= ' FOR UPDATE';
4024                                         }
4025
4026                                         $varRes = $dbr->query( $variantQuery, $fname );
4027
4028                                         // for each found variants, figure out link holders and replace
4029                                         while ( $s = $dbr->fetchObject($varRes) ) {
4030
4031                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4032                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4033                                                 $vardbk = $variantTitle->getDBkey();
4034
4035                                                 $holderKeys = array();
4036                                                 if(isset($variantMap[$varPdbk])){
4037                                                         $holderKeys = $variantMap[$varPdbk];
4038                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4039                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4040                                                 }
4041
4042                                                 // loop over link holders
4043                                                 foreach($holderKeys as $key){
4044                                                         $title = $this->mLinkHolders['titles'][$key];
4045                                                         if ( is_null( $title ) ) continue;
4046
4047                                                         $pdbk = $title->getPrefixedDBkey();
4048
4049                                                         if(!isset($colours[$pdbk])){
4050                                                                 // found link in some of the variants, replace the link holder data
4051                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4052                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4053
4054                                                                 // set pdbk and colour
4055                                                                 $pdbks[$key] = $varPdbk;
4056                                                                 if ( $threshold >  0 ) {
4057                                                                         $size = $s->page_len;
4058                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4059                                                                                 $colours[$varPdbk] = 1;
4060                                                                         } else {
4061                                                                                 $colours[$varPdbk] = 2;
4062                                                                         }
4063                                                                 }
4064                                                                 else {
4065                                                                         $colours[$varPdbk] = 1;
4066                                                                 }
4067                                                         }
4068                                                 }
4069
4070                                                 // check if the object is a variant of a category
4071                                                 if(isset($categoryMap[$vardbk])){
4072                                                         $oldkey = $categoryMap[$vardbk];
4073                                                         if($oldkey != $vardbk)
4074                                                                 $varCategories[$oldkey]=$vardbk;
4075                                                 }
4076                                         }
4077
4078                                         // rebuild the categories in original order (if there are replacements)
4079                                         if(count($varCategories)>0){
4080                                                 $newCats = array();
4081                                                 $originalCats = $this->mOutput->getCategories();
4082                                                 foreach($originalCats as $cat => $sortkey){
4083                                                         // make the replacement
4084                                                         if( array_key_exists($cat,$varCategories) )
4085                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4086                                                         else $newCats[$cat] = $sortkey;
4087                                                 }
4088                                                 $this->mOutput->setCategoryLinks($newCats);
4089                                         }
4090                                 }
4091                         }
4092
4093                         # Construct search and replace arrays
4094                         wfProfileIn( $fname.'-construct' );
4095                         $replacePairs = array();
4096                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4097                                 $pdbk = $pdbks[$key];
4098                                 $searchkey = "<!--LINK $key-->";
4099                                 $title = $this->mLinkHolders['titles'][$key];
4100                                 if ( empty( $colours[$pdbk] ) ) {
4101                                         $linkCache->addBadLinkObj( $title );
4102                                         $colours[$pdbk] = 0;
4103                                         $this->mOutput->addLink( $title, 0 );
4104                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4105                                                                         $this->mLinkHolders['texts'][$key],
4106                                                                         $this->mLinkHolders['queries'][$key] );
4107                                 } elseif ( $colours[$pdbk] == 1 ) {
4108                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4109                                                                         $this->mLinkHolders['texts'][$key],
4110                                                                         $this->mLinkHolders['queries'][$key] );
4111                                 } elseif ( $colours[$pdbk] == 2 ) {
4112                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4113                                                                         $this->mLinkHolders['texts'][$key],
4114                                                                         $this->mLinkHolders['queries'][$key] );
4115                                 }
4116                         }
4117                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4118                         wfProfileOut( $fname.'-construct' );
4119
4120                         # Do the thing
4121                         wfProfileIn( $fname.'-replace' );
4122                         $text = preg_replace_callback(
4123                                 '/(<!--LINK .*?-->)/',
4124                                 $replacer->cb(),
4125                                 $text);
4126
4127                         wfProfileOut( $fname.'-replace' );
4128                 }
4129
4130                 # Now process interwiki link holders
4131                 # This is quite a bit simpler than internal links
4132                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4133                         wfProfileIn( $fname.'-interwiki' );
4134                         # Make interwiki link HTML
4135                         $replacePairs = array();
4136                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4137                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4138                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4139                         }
4140                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4141
4142                         $text = preg_replace_callback(
4143                                 '/<!--IWLINK (.*?)-->/',
4144                                 $replacer->cb(),
4145                                 $text );
4146                         wfProfileOut( $fname.'-interwiki' );
4147                 }
4148
4149                 wfProfileOut( $fname );
4150                 return $colours;
4151         }
4152
4153         /**
4154          * Replace <!--LINK--> link placeholders with plain text of links
4155          * (not HTML-formatted).
4156          * @param string $text
4157          * @return string
4158          */
4159         function replaceLinkHoldersText( $text ) {
4160                 $fname = 'Parser::replaceLinkHoldersText';
4161                 wfProfileIn( $fname );
4162
4163                 $text = preg_replace_callback(
4164                         '/<!--(LINK|IWLINK) (.*?)-->/',
4165                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4166                         $text );
4167
4168                 wfProfileOut( $fname );
4169                 return $text;
4170         }
4171
4172         /**
4173          * @param array $matches
4174          * @return string
4175          * @private
4176          */
4177         function replaceLinkHoldersTextCallback( $matches ) {
4178                 $type = $matches[1];
4179                 $key  = $matches[2];
4180                 if( $type == 'LINK' ) {
4181                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4182                                 return $this->mLinkHolders['texts'][$key];
4183                         }
4184                 } elseif( $type == 'IWLINK' ) {
4185                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4186                                 return $this->mInterwikiLinkHolders['texts'][$key];
4187                         }
4188                 }
4189                 return $matches[0];
4190         }
4191
4192         /**
4193          * Tag hook handler for 'pre'.
4194          */
4195         function renderPreTag( $text, $attribs ) {
4196                 // Backwards-compatibility hack
4197                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4198
4199                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4200                 return wfOpenElement( 'pre', $attribs ) .
4201                         Xml::escapeTagsOnly( $content ) .
4202                         '</pre>';
4203         }
4204
4205         /**
4206          * Renders an image gallery from a text with one line per image.
4207          * text labels may be given by using |-style alternative text. E.g.
4208          *   Image:one.jpg|The number "1"
4209          *   Image:tree.jpg|A tree
4210          * given as text will return the HTML of a gallery with two images,
4211          * labeled 'The number "1"' and
4212          * 'A tree'.
4213          */
4214         function renderImageGallery( $text, $params ) {
4215                 $ig = new ImageGallery();
4216                 $ig->setContextTitle( $this->mTitle );
4217                 $ig->setShowBytes( false );
4218                 $ig->setShowFilename( false );
4219                 $ig->setParsing();
4220                 $ig->useSkin( $this->mOptions->getSkin() );
4221
4222                 if( isset( $params['caption'] ) ) {
4223                         $caption = $params['caption'];
4224                         $caption = htmlspecialchars( $caption );
4225                         $caption = $this->replaceInternalLinks( $caption );
4226                         $ig->setCaptionHtml( $caption );
4227                 }
4228                 if( isset( $params['perrow'] ) ) {
4229                         $ig->setPerRow( $params['perrow'] );
4230                 }
4231                 if( isset( $params['widths'] ) ) {
4232                         $ig->setWidths( $params['widths'] );
4233                 }
4234                 if( isset( $params['heights'] ) ) {
4235                         $ig->setHeights( $params['heights'] );
4236                 }
4237
4238                 $lines = explode( "\n", $text );
4239                 foreach ( $lines as $line ) {
4240                         # match lines like these:
4241                         # Image:someimage.jpg|This is some image
4242                         $matches = array();
4243                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4244                         # Skip empty lines
4245                         if ( count( $matches ) == 0 ) {
4246                                 continue;
4247                         }
4248                         $tp = Title::newFromText( $matches[1] );
4249                         $nt =& $tp;
4250                         if( is_null( $nt ) ) {
4251                                 # Bogus title. Ignore these so we don't bomb out later.
4252                                 continue;
4253                         }
4254                         if ( isset( $matches[3] ) ) {
4255                                 $label = $matches[3];
4256                         } else {
4257                                 $label = '';
4258                         }
4259
4260                         $pout = $this->parse( $label,
4261                                 $this->mTitle,
4262                                 $this->mOptions,
4263                                 false, // Strip whitespace...?
4264                                 false  // Don't clear state!
4265                         );
4266                         $html = $pout->getText();
4267
4268                         $ig->add( new Image( $nt ), $html );
4269
4270                         # Only add real images (bug #5586)
4271                         if ( $nt->getNamespace() == NS_IMAGE ) {
4272                                 $this->mOutput->addImage( $nt->getDBkey() );
4273                         }
4274                 }
4275                 return $ig->toHTML();
4276         }
4277
4278         /**
4279          * Parse image options text and use it to make an image
4280          */
4281         function makeImage( $nt, $options ) {
4282                 # @TODO: let the MediaHandler specify its transform parameters
4283                 #
4284                 # Check if the options text is of the form "options|alt text"
4285                 # Options are:
4286                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4287                 #  * left               no resizing, just left align. label is used for alt= only
4288                 #  * right              same, but right aligned
4289                 #  * none               same, but not aligned
4290                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4291                 #  * center             center the image
4292                 #  * framed             Keep original image size, no magnify-button.
4293                 # vertical-align values (no % or length right now):
4294                 #  * baseline
4295                 #  * sub
4296                 #  * super
4297                 #  * top
4298                 #  * text-top
4299                 #  * middle
4300                 #  * bottom
4301                 #  * text-bottom
4302
4303
4304                 $part = array_map( 'trim', explode( '|', $options) );
4305
4306                 $mwAlign = array();
4307                 $alignments = array( 'left', 'right', 'center', 'none', 'baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom' );
4308                 foreach ( $alignments as $alignment ) {
4309                         $mwAlign[$alignment] =& MagicWord::get( 'img_'.$alignment );
4310                 }
4311                 $mwThumb  =& MagicWord::get( 'img_thumbnail' );
4312                 $mwManualThumb =& MagicWord::get( 'img_manualthumb' );
4313                 $mwWidth  =& MagicWord::get( 'img_width' );
4314                 $mwFramed =& MagicWord::get( 'img_framed' );
4315                 $mwPage   =& MagicWord::get( 'img_page' );
4316                 $caption = '';
4317
4318                 $params = array();
4319                 $framed = $thumb = false;
4320                 $manual_thumb = '' ;
4321                 $align = $valign = '';
4322                 $sk = $this->mOptions->getSkin();
4323
4324                 foreach( $part as $val ) {
4325                         if ( !is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4326                                 $thumb=true;
4327                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4328                                 # use manually specified thumbnail
4329                                 $thumb=true;
4330                                 $manual_thumb = $match;
4331                         } else {
4332                                 foreach( $alignments as $alignment ) {
4333                                         if ( ! is_null( $mwAlign[$alignment]->matchVariableStartToEnd($val) ) ) {
4334                                                 switch ( $alignment ) {
4335                                                         case 'left': case 'right': case 'center': case 'none':
4336                                                                 $align = $alignment; break;
4337                                                         default:
4338                                                                 $valign = $alignment;
4339                                                 }
4340                                                 continue 2;
4341                                         }
4342                                 }
4343                                 if ( ! is_null( $match = $mwPage->matchVariableStartToEnd($val) ) ) {
4344                                         # Select a page in a multipage document
4345                                         $params['page'] = $match;
4346                                 } elseif ( !isset( $params['width'] ) && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4347                                         wfDebug( "img_width match: $match\n" );
4348                                         # $match is the image width in pixels
4349                                         $m = array();
4350                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4351                                                  $params['width'] = intval( $m[1] );
4352                                                  $params['height'] = intval( $m[2] );
4353                                         } else {
4354                                                 $params['width'] = intval($match);
4355                                         }
4356                                 } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4357                                         $framed=true;
4358                                 } else {
4359                                         $caption = $val;
4360                                 }
4361                         }
4362                 }
4363                 # Strip bad stuff out of the alt text
4364                 $alt = $this->replaceLinkHoldersText( $caption );
4365
4366                 # make sure there are no placeholders in thumbnail attributes
4367                 # that are later expanded to html- so expand them now and
4368                 # remove the tags
4369                 $alt = $this->mStripState->unstripBoth( $alt );
4370                 $alt = Sanitizer::stripAllTags( $alt );
4371
4372                 # Linker does the rest
4373                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $params, $framed, $thumb, $manual_thumb, $valign );
4374         }
4375
4376         /**
4377          * Set a flag in the output object indicating that the content is dynamic and
4378          * shouldn't be cached.
4379          */
4380         function disableCache() {
4381                 wfDebug( "Parser output marked as uncacheable.\n" );
4382                 $this->mOutput->mCacheTime = -1;
4383         }
4384
4385         /**#@+
4386          * Callback from the Sanitizer for expanding items found in HTML attribute
4387          * values, so they can be safely tested and escaped.
4388          * @param string $text
4389          * @param array $args
4390          * @return string
4391          * @private
4392          */
4393         function attributeStripCallback( &$text, $args ) {
4394                 $text = $this->replaceVariables( $text, $args );
4395                 $text = $this->mStripState->unstripBoth( $text );
4396                 return $text;
4397         }
4398
4399         /**#@-*/
4400
4401         /**#@+
4402          * Accessor/mutator
4403          */
4404         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4405         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4406         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4407         /**#@-*/
4408
4409         /**#@+
4410          * Accessor
4411          */
4412         function getTags() { return array_keys( $this->mTagHooks ); }
4413         /**#@-*/
4414
4415
4416         /**
4417          * Break wikitext input into sections, and either pull or replace
4418          * some particular section's text.
4419          *
4420          * External callers should use the getSection and replaceSection methods.
4421          *
4422          * @param $text Page wikitext
4423          * @param $section Numbered section. 0 pulls the text before the first
4424          *                 heading; other numbers will pull the given section
4425          *                 along with its lower-level subsections.
4426          * @param $mode One of "get" or "replace"
4427          * @param $newtext Replacement text for section data.
4428          * @return string for "get", the extracted section text.
4429          *                for "replace", the whole page with the section replaced.
4430          */
4431         private function extractSections( $text, $section, $mode, $newtext='' ) {
4432                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4433                 # comments to be stripped as well)
4434                 $stripState = new StripState;
4435
4436                 $oldOutputType = $this->mOutputType;
4437                 $oldOptions = $this->mOptions;
4438                 $this->mOptions = new ParserOptions();
4439                 $this->setOutputType( OT_WIKI );
4440
4441                 $striptext = $this->strip( $text, $stripState, true );
4442
4443                 $this->setOutputType( $oldOutputType );
4444                 $this->mOptions = $oldOptions;
4445
4446                 # now that we can be sure that no pseudo-sections are in the source,
4447                 # split it up by section
4448                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4449                 $comment = "(?:$uniq-!--.*?QINU)";
4450                 $secs = preg_split(
4451                         "/
4452                         (
4453                                 ^
4454                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4455                                 (=+) # Should this be limited to 6?
4456                                 .+?  # Section title...
4457                                 \\2  # Ending = count must match start
4458                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4459                                 $
4460                         |
4461                                 <h([1-6])\b.*?>
4462                                 .*?
4463                                 <\/h\\3\s*>
4464                         )
4465                         /mix",
4466                         $striptext, -1,
4467                         PREG_SPLIT_DELIM_CAPTURE);
4468
4469                 if( $mode == "get" ) {
4470                         if( $section == 0 ) {
4471                                 // "Section 0" returns the content before any other section.
4472                                 $rv = $secs[0];
4473                         } else {
4474                                 //track missing section, will replace if found.
4475                                 $rv = $newtext;
4476                         }
4477                 } elseif( $mode == "replace" ) {
4478                         if( $section == 0 ) {
4479                                 $rv = $newtext . "\n\n";
4480                                 $remainder = true;
4481                         } else {
4482                                 $rv = $secs[0];
4483                                 $remainder = false;
4484                         }
4485                 }
4486                 $count = 0;
4487                 $sectionLevel = 0;
4488                 for( $index = 1; $index < count( $secs ); ) {
4489                         $headerLine = $secs[$index++];
4490                         if( $secs[$index] ) {
4491                                 // A wiki header
4492                                 $headerLevel = strlen( $secs[$index++] );
4493                         } else {
4494                                 // An HTML header
4495                                 $index++;
4496                                 $headerLevel = intval( $secs[$index++] );
4497                         }
4498                         $content = $secs[$index++];
4499
4500                         $count++;
4501                         if( $mode == "get" ) {
4502                                 if( $count == $section ) {
4503                                         $rv = $headerLine . $content;
4504                                         $sectionLevel = $headerLevel;
4505                                 } elseif( $count > $section ) {
4506                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4507                                                 $rv .= $headerLine . $content;
4508                                         } else {
4509                                                 // Broke out to a higher-level section
4510                                                 break;
4511                                         }
4512                                 }
4513                         } elseif( $mode == "replace" ) {
4514                                 if( $count < $section ) {
4515                                         $rv .= $headerLine . $content;
4516                                 } elseif( $count == $section ) {
4517                                         $rv .= $newtext . "\n\n";
4518                                         $sectionLevel = $headerLevel;
4519                                 } elseif( $count > $section ) {
4520                                         if( $headerLevel <= $sectionLevel ) {
4521                                                 // Passed the section's sub-parts.
4522                                                 $remainder = true;
4523                                         }
4524                                         if( $remainder ) {
4525                                                 $rv .= $headerLine . $content;
4526                                         }
4527                                 }
4528                         }
4529                 }
4530                 if (is_string($rv))
4531                         # reinsert stripped tags
4532                         $rv = trim( $stripState->unstripBoth( $rv ) );
4533
4534                 return $rv;
4535         }
4536
4537         /**
4538          * This function returns the text of a section, specified by a number ($section).
4539          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4540          * the first section before any such heading (section 0).
4541          *
4542          * If a section contains subsections, these are also returned.
4543          *
4544          * @param $text String: text to look in
4545          * @param $section Integer: section number
4546          * @param $deftext: default to return if section is not found
4547          * @return string text of the requested section
4548          */
4549         public function getSection( $text, $section, $deftext='' ) {
4550                 return $this->extractSections( $text, $section, "get", $deftext );
4551         }
4552
4553         public function replaceSection( $oldtext, $section, $text ) {
4554                 return $this->extractSections( $oldtext, $section, "replace", $text );
4555         }
4556
4557         /**
4558          * Get the timestamp associated with the current revision, adjusted for
4559          * the default server-local timestamp
4560          */
4561         function getRevisionTimestamp() {
4562                 if ( is_null( $this->mRevisionTimestamp ) ) {
4563                         wfProfileIn( __METHOD__ );
4564                         global $wgContLang;
4565                         $dbr = wfGetDB( DB_SLAVE );
4566                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4567                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4568
4569                         // Normalize timestamp to internal MW format for timezone processing.
4570                         // This has the added side-effect of replacing a null value with
4571                         // the current time, which gives us more sensible behavior for
4572                         // previews.
4573                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4574
4575                         // The cryptic '' timezone parameter tells to use the site-default
4576                         // timezone offset instead of the user settings.
4577                         //
4578                         // Since this value will be saved into the parser cache, served
4579                         // to other users, and potentially even used inside links and such,
4580                         // it needs to be consistent for all visitors.
4581                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4582
4583                         wfProfileOut( __METHOD__ );
4584                 }
4585                 return $this->mRevisionTimestamp;
4586         }
4587
4588         /**
4589          * Mutator for $mDefaultSort
4590          *
4591          * @param $sort New value
4592          */
4593         public function setDefaultSort( $sort ) {
4594                 $this->mDefaultSort = $sort;
4595         }
4596
4597         /**
4598          * Accessor for $mDefaultSort
4599          * Will use the title/prefixed title if none is set
4600          *
4601          * @return string
4602          */
4603         public function getDefaultSort() {
4604                 if( $this->mDefaultSort !== false ) {
4605                         return $this->mDefaultSort;
4606                 } else {
4607                         return $this->mTitle->getNamespace() == NS_CATEGORY
4608                                         ? $this->mTitle->getText()
4609                                         : $this->mTitle->getPrefixedText();
4610                 }
4611         }
4612
4613 }
4614
4615 /**
4616  * @todo document, briefly.
4617  * @addtogroup Parser
4618  */
4619 class OnlyIncludeReplacer {
4620         var $output = '';
4621
4622         function replace( $matches ) {
4623                 if ( substr( $matches[1], -1 ) == "\n" ) {
4624                         $this->output .= substr( $matches[1], 0, -1 );
4625                 } else {
4626                         $this->output .= $matches[1];
4627                 }
4628         }
4629 }
4630
4631 /**
4632  * @todo document, briefly.
4633  * @addtogroup Parser
4634  */
4635 class StripState {
4636         var $general, $nowiki;
4637
4638         function __construct() {
4639                 $this->general = new ReplacementArray;
4640                 $this->nowiki = new ReplacementArray;
4641         }
4642
4643         function unstripGeneral( $text ) {
4644                 wfProfileIn( __METHOD__ );
4645                 $text = $this->general->replace( $text );
4646                 wfProfileOut( __METHOD__ );
4647                 return $text;
4648         }
4649
4650         function unstripNoWiki( $text ) {
4651                 wfProfileIn( __METHOD__ );
4652                 $text = $this->nowiki->replace( $text );
4653                 wfProfileOut( __METHOD__ );
4654                 return $text;
4655         }
4656
4657         function unstripBoth( $text ) {
4658                 wfProfileIn( __METHOD__ );
4659                 $text = $this->general->replace( $text );
4660                 $text = $this->nowiki->replace( $text );
4661                 wfProfileOut( __METHOD__ );
4662                 return $text;
4663         }
4664 }
4665
4666 ?>