includes/parser/Parser.php

   1 <?php
   2 /**
   3  * @defgroup Parser Parser
   4  *
   5  * @file
   6  * @ingroup Parser
   7  * File for Parser and related classes
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * preprocess()
  24  *   removes HTML comments and expands templates
  25  * cleanSig()
  26  *   Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *   Extracts sections from an article for section editing
  29  *
  30  * Globals used:
  31  *    objects:   $wgLang, $wgContLang
  32  *
  33  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  34  *
  35  * settings:
  36  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  37  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  38  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  39  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @ingroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  65
  66         // State constants for the definition list colon extraction
  67         const COLON_STATE_TEXT = 0;
  68         const COLON_STATE_TAG = 1;
  69         const COLON_STATE_TAGSTART = 2;
  70         const COLON_STATE_CLOSETAG = 3;
  71         const COLON_STATE_TAGSLASH = 4;
  72         const COLON_STATE_COMMENT = 5;
  73         const COLON_STATE_COMMENTDASH = 6;
  74         const COLON_STATE_COMMENTDASHDASH = 7;
  75
  76         // Flags for preprocessToDom
  77         const PTD_FOR_INCLUSION = 1;
  78
  79         // Allowed values for $this->mOutputType
  80         // Parameter to startExternalParse().
  81         const OT_HTML = 1;
  82         const OT_WIKI = 2;
  83         const OT_PREPROCESS = 3;
  84         const OT_MSG = 3;
  85
  86         // Marker Suffix needs to be accessible staticly.
  87         const MARKER_SUFFIX = "-QINU\x7f";
  88
  89         /**#@+
  90          * @private
  91          */
  92         # Persistent:
  93         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  94                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerIndex, $mPreprocessor,
  95                 $mExtLinkBracketedRegex, $mDefaultStripList, $mVarCache, $mConf;
  96
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 100         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101         var $mLinkHolders, $mLinkID;
 102         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 103         var $mTplExpandCache; // empty-frame expansion cache
 104         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 105         var $mExpensiveFunctionCount; // number of expensive parser function calls
 106
 107         # Temporary
 108         # These are variables reset at least once per parse regardless of $clearState
 109         var $mOptions,      // ParserOptions object
 110                 $mTitle,        // Title context, used for self-link rendering and similar things
 111                 $mOutputType,   // Output type, one of the OT_xxx constants
 112                 $ot,            // Shortcut alias, see setOutputType()
 113                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 114                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 115                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 116
 117         /**#@-*/
 118
 119         /**
 120          * Constructor
 121          *
 122          * @public
 123          */
 124         function __construct( $conf = array() ) {
 125                 $this->mConf = $conf;
 126                 $this->mTagHooks = array();
 127                 $this->mTransparentTagHooks = array();
 128                 $this->mFunctionHooks = array();
 129                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 130                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery' );
 131                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 132                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 133                 $this->mVarCache = array();
 134                 if ( isset( $conf['preprocessorClass'] ) ) {
 135                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 136                 } elseif ( extension_loaded( 'dom' ) ) {
 137                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 138                 } else {
 139                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 140                 }
 141                 $this->mMarkerIndex = 0;
 142                 $this->mFirstCall = true;
 143         }
 144
 145         /**
 146          * Do various kinds of initialisation on the first call of the parser
 147          */
 148         function firstCallInit() {
 149                 if ( !$this->mFirstCall ) {
 150                         return;
 151                 }
 152                 $this->mFirstCall = false;
 153
 154                 wfProfileIn( __METHOD__ );
 155
 156                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 157                 CoreParserFunctions::register( $this );
 158                 $this->initialiseVariables();
 159
 160                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 161                 wfProfileOut( __METHOD__ );
 162         }
 163
 164         /**
 165          * Clear Parser state
 166          *
 167          * @private
 168          */
 169         function clearState() {
 170                 wfProfileIn( __METHOD__ );
 171                 if ( $this->mFirstCall ) {
 172                         $this->firstCallInit();
 173                 }
 174                 $this->mOutput = new ParserOutput;
 175                 $this->mAutonumber = 0;
 176                 $this->mLastSection = '';
 177                 $this->mDTopen = false;
 178                 $this->mIncludeCount = array();
 179                 $this->mStripState = new StripState;
 180                 $this->mArgStack = false;
 181                 $this->mInPre = false;
 182                 $this->mLinkHolders = new LinkHolderArray( $this );
 183                 $this->mLinkID = 0;
 184                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 185
 186                 /**
 187                  * Prefix for temporary replacement strings for the multipass parser.
 188                  * \x07 should never appear in input as it's disallowed in XML.
 189                  * Using it at the front also gives us a little extra robustness
 190                  * since it shouldn't match when butted up against identifier-like
 191                  * string constructs.
 192                  *
 193                  * Must not consist of all title characters, or else it will change
 194                  * the behaviour of <nowiki> in a link.
 195                  */
 196                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 197                 # Changed to \x7f to allow XML double-parsing -- TS
 198                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 199
 200
 201                 # Clear these on every parse, bug 4549
 202                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 203
 204                 $this->mShowToc = true;
 205                 $this->mForceTocPosition = false;
 206                 $this->mIncludeSizes = array(
 207                         'post-expand' => 0,
 208                         'arg' => 0,
 209                 );
 210                 $this->mPPNodeCount = 0;
 211                 $this->mDefaultSort = false;
 212                 $this->mHeadings = array();
 213                 $this->mDoubleUnderscores = array();
 214                 $this->mExpensiveFunctionCount = 0;
 215
 216                 # Fix cloning
 217                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 218                         $this->mPreprocessor = null;
 219                 }
 220
 221                 wfRunHooks( 'ParserClearState', array( &$this ) );
 222                 wfProfileOut( __METHOD__ );
 223         }
 224
 225         function setOutputType( $ot ) {
 226                 $this->mOutputType = $ot;
 227                 // Shortcut alias
 228                 $this->ot = array(
 229                         'html' => $ot == self::OT_HTML,
 230                         'wiki' => $ot == self::OT_WIKI,
 231                         'pre' => $ot == self::OT_PREPROCESS,
 232                 );
 233         }
 234
 235         /**
 236          * Set the context title
 237          */
 238         function setTitle( $t ) {
 239                 if ( !$t || $t instanceof FakeTitle ) {
 240                         $t = Title::newFromText( 'NO TITLE' );
 241                 }
 242                 if ( strval( $t->getFragment() ) !== '' ) {
 243                         # Strip the fragment to avoid various odd effects
 244                         $this->mTitle = clone $t;
 245                         $this->mTitle->setFragment( '' );
 246                 } else {
 247                         $this->mTitle = $t;
 248                 }
 249         }
 250
 251         /**
 252          * Accessor for mUniqPrefix.
 253          *
 254          * @public
 255          */
 256         function uniqPrefix() {
 257                 if( !isset( $this->mUniqPrefix ) ) {
 258                         // @fixme this is probably *horribly wrong*
 259                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 260                         // if this is called for a parser cache hit, the parser may not
 261                         // have ever been initialized in the first place.
 262                         // Not really sure what the heck is supposed to be going on here.
 263                         return '';
 264                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 265                 }
 266                 return $this->mUniqPrefix;
 267         }
 268
 269         /**
 270          * Convert wikitext to HTML
 271          * Do not call this function recursively.
 272          *
 273          * @param $text String: text we want to parse
 274          * @param $title A title object
 275          * @param $options ParserOptions
 276          * @param $linestart boolean
 277          * @param $clearState boolean
 278          * @param $revid Int: number to pass in {{REVISIONID}}
 279          * @return ParserOutput a ParserOutput
 280          */
 281         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 282                 /**
 283                  * First pass--just handle <nowiki> sections, pass the rest off
 284                  * to internalParse() which does all the real work.
 285                  */
 286
 287                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 288                 $fname = __METHOD__.'-' . wfGetCaller();
 289                 wfProfileIn( __METHOD__ );
 290                 wfProfileIn( $fname );
 291
 292                 if ( $clearState ) {
 293                         $this->clearState();
 294                 }
 295
 296                 $this->mOptions = $options;
 297                 $this->setTitle( $title );
 298                 $oldRevisionId = $this->mRevisionId;
 299                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 300                 if( $revid !== null ) {
 301                         $this->mRevisionId = $revid;
 302                         $this->mRevisionTimestamp = null;
 303                 }
 304                 $this->setOutputType( self::OT_HTML );
 305                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 306                 # No more strip!
 307                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 308                 $text = $this->internalParse( $text );
 309                 $text = $this->mStripState->unstripGeneral( $text );
 310
 311                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 312                 $fixtags = array(
 313                         # french spaces, last one Guillemet-left
 314                         # only if there is something before the space
 315                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 316                         # french spaces, Guillemet-right
 317                         '/(\\302\\253) /' => '\\1&nbsp;',
 318                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 319                 );
 320                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 321
 322                 $text = $this->doBlockLevels( $text, $linestart );
 323
 324                 $this->replaceLinkHolders( $text );
 325
 326                 # the position of the parserConvert() call should not be changed. it
 327                 # assumes that the links are all replaced and the only thing left
 328                 # is the <nowiki> mark.
 329                 # Side-effects: this calls $this->mOutput->setTitleText()
 330                 $text = $wgContLang->parserConvert( $text, $this );
 331
 332                 $text = $this->mStripState->unstripNoWiki( $text );
 333
 334                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 335
 336 //!JF Move to its own function
 337
 338                 $uniq_prefix = $this->mUniqPrefix;
 339                 $matches = array();
 340                 $elements = array_keys( $this->mTransparentTagHooks );
 341                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 342
 343                 foreach( $matches as $marker => $data ) {
 344                         list( $element, $content, $params, $tag ) = $data;
 345                         $tagName = strtolower( $element );
 346                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 347                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 348                                         array( $content, $params, $this ) );
 349                         } else {
 350                                 $output = $tag;
 351                         }
 352                         $this->mStripState->general->setPair( $marker, $output );
 353                 }
 354                 $text = $this->mStripState->unstripGeneral( $text );
 355
 356                 $text = Sanitizer::normalizeCharReferences( $text );
 357
 358                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 359                         $text = self::tidy($text);
 360                 } else {
 361                         # attempt to sanitize at least some nesting problems
 362                         # (bug #2702 and quite a few others)
 363                         $tidyregs = array(
 364                                 # ''Something [http://www.cool.com cool''] -->
 365                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 366                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 367                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 368                                 # fix up an anchor inside another anchor, only
 369                                 # at least for a single single nested link (bug 3695)
 370                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 371                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 372                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 373                                 # contains a div, so fix it up here; replace
 374                                 # div with escaped text
 375                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 376                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 377                                 # remove empty italic or bold tag pairs, some
 378                                 # introduced by rules above
 379                                 '/<([bi])><\/\\1>/' => '',
 380                         );
 381
 382                         $text = preg_replace(
 383                                 array_keys( $tidyregs ),
 384                                 array_values( $tidyregs ),
 385                                 $text );
 386                 }
 387                 global $wgExpensiveParserFunctionLimit;
 388                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 389                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 390                 }
 391
 392                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 393
 394                 # Information on include size limits, for the benefit of users who try to skirt them
 395                 if ( $this->mOptions->getEnableLimitReport() ) {
 396                         global $wgExpensiveParserFunctionLimit;
 397                         $max = $this->mOptions->getMaxIncludeSize();
 398                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 399                         $limitReport =
 400                                 "NewPP limit report\n" .
 401                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 402                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 403                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 404                                 $PFreport;
 405                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 406                         $text .= "\n<!-- \n$limitReport-->\n";
 407                 }
 408                 $this->mOutput->setText( $text );
 409                 $this->mRevisionId = $oldRevisionId;
 410                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 411                 wfProfileOut( $fname );
 412                 wfProfileOut( __METHOD__ );
 413
 414                 return $this->mOutput;
 415         }
 416
 417         /**
 418          * Recursive parser entry point that can be called from an extension tag
 419          * hook.
 420          */
 421         function recursiveTagParse( $text ) {
 422                 wfProfileIn( __METHOD__ );
 423                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 424                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 425                 $text = $this->internalParse( $text );
 426                 wfProfileOut( __METHOD__ );
 427                 return $text;
 428         }
 429
 430         /**
 431          * Expand templates and variables in the text, producing valid, static wikitext.
 432          * Also removes comments.
 433          */
 434         function preprocess( $text, $title, $options, $revid = null ) {
 435                 wfProfileIn( __METHOD__ );
 436                 $this->clearState();
 437                 $this->setOutputType( self::OT_PREPROCESS );
 438                 $this->mOptions = $options;
 439                 $this->setTitle( $title );
 440                 if( $revid !== null ) {
 441                         $this->mRevisionId = $revid;
 442                 }
 443                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 444                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 445                 $text = $this->replaceVariables( $text );
 446                 $text = $this->mStripState->unstripBoth( $text );
 447                 wfProfileOut( __METHOD__ );
 448                 return $text;
 449         }
 450
 451         /**
 452          * Get a random string
 453          *
 454          * @private
 455          * @static
 456          */
 457         function getRandomString() {
 458                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 459         }
 460
 461         function &getTitle() { return $this->mTitle; }
 462         function getOptions() { return $this->mOptions; }
 463         function getRevisionId() { return $this->mRevisionId; }
 464         function getOutput() { return $this->mOutput; }
 465         function nextLinkID() { return $this->mLinkID++; }
 466
 467         function getFunctionLang() {
 468                 global $wgLang, $wgContLang;
 469
 470                 $target = $this->mOptions->getTargetLanguage();
 471                 if ( $target !== null ) {
 472                         return $target;
 473                 } else {
 474                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 475                 }
 476         }
 477
 478         /**
 479          * Get a preprocessor object
 480          */
 481         function getPreprocessor() {
 482                 if ( !isset( $this->mPreprocessor ) ) {
 483                         $class = $this->mPreprocessorClass;
 484                         $this->mPreprocessor = new $class( $this );
 485                 }
 486                 return $this->mPreprocessor;
 487         }
 488
 489         /**
 490          * Replaces all occurrences of HTML-style comments and the given tags
 491          * in the text with a random marker and returns the next text. The output
 492          * parameter $matches will be an associative array filled with data in
 493          * the form:
 494          *   'UNIQ-xxxxx' => array(
 495          *     'element',
 496          *     'tag content',
 497          *     array( 'param' => 'x' ),
 498          *     '<element param="x">tag content</element>' ) )
 499          *
 500          * @param $elements list of element names. Comments are always extracted.
 501          * @param $text Source text string.
 502          * @param $uniq_prefix
 503          *
 504          * @public
 505          * @static
 506          */
 507         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 508                 static $n = 1;
 509                 $stripped = '';
 510                 $matches = array();
 511
 512                 $taglist = implode( '|', $elements );
 513                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 514
 515                 while ( '' != $text ) {
 516                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 517                         $stripped .= $p[0];
 518                         if( count( $p ) < 5 ) {
 519                                 break;
 520                         }
 521                         if( count( $p ) > 5 ) {
 522                                 // comment
 523                                 $element    = $p[4];
 524                                 $attributes = '';
 525                                 $close      = '';
 526                                 $inside     = $p[5];
 527                         } else {
 528                                 // tag
 529                                 $element    = $p[1];
 530                                 $attributes = $p[2];
 531                                 $close      = $p[3];
 532                                 $inside     = $p[4];
 533                         }
 534
 535                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 536                         $stripped .= $marker;
 537
 538                         if ( $close === '/>' ) {
 539                                 // Empty element tag, <tag />
 540                                 $content = null;
 541                                 $text = $inside;
 542                                 $tail = null;
 543                         } else {
 544                                 if( $element == '!--' ) {
 545                                         $end = '/(-->)/';
 546                                 } else {
 547                                         $end = "/(<\\/$element\\s*>)/i";
 548                                 }
 549                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 550                                 $content = $q[0];
 551                                 if( count( $q ) < 3 ) {
 552                                         # No end tag -- let it run out to the end of the text.
 553                                         $tail = '';
 554                                         $text = '';
 555                                 } else {
 556                                         $tail = $q[1];
 557                                         $text = $q[2];
 558                                 }
 559                         }
 560
 561                         $matches[$marker] = array( $element,
 562                                 $content,
 563                                 Sanitizer::decodeTagAttributes( $attributes ),
 564                                 "<$element$attributes$close$content$tail" );
 565                 }
 566                 return $stripped;
 567         }
 568
 569         /**
 570          * Get a list of strippable XML-like elements
 571          */
 572         function getStripList() {
 573                 global $wgRawHtml;
 574                 $elements = $this->mStripList;
 575                 if( $wgRawHtml ) {
 576                         $elements[] = 'html';
 577                 }
 578                 if( $this->mOptions->getUseTeX() ) {
 579                         $elements[] = 'math';
 580                 }
 581                 return $elements;
 582         }
 583
 584         /**
 585          * @deprecated use replaceVariables
 586          */
 587         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 588                 return $text;
 589         }
 590
 591         /**
 592          * Restores pre, math, and other extensions removed by strip()
 593          *
 594          * always call unstripNoWiki() after this one
 595          * @private
 596          * @deprecated use $this->mStripState->unstrip()
 597          */
 598         function unstrip( $text, $state ) {
 599                 return $state->unstripGeneral( $text );
 600         }
 601
 602         /**
 603          * Always call this after unstrip() to preserve the order
 604          *
 605          * @private
 606          * @deprecated use $this->mStripState->unstrip()
 607          */
 608         function unstripNoWiki( $text, $state ) {
 609                 return $state->unstripNoWiki( $text );
 610         }
 611
 612         /**
 613          * @deprecated use $this->mStripState->unstripBoth()
 614          */
 615         function unstripForHTML( $text ) {
 616                 return $this->mStripState->unstripBoth( $text );
 617         }
 618
 619         /**
 620          * Add an item to the strip state
 621          * Returns the unique tag which must be inserted into the stripped text
 622          * The tag will be replaced with the original text in unstrip()
 623          *
 624          * @private
 625          */
 626         function insertStripItem( $text ) {
 627                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 628                 $this->mMarkerIndex++;
 629                 $this->mStripState->general->setPair( $rnd, $text );
 630                 return $rnd;
 631         }
 632
 633         /**
 634          * Interface with html tidy, used if $wgUseTidy = true.
 635          * If tidy isn't able to correct the markup, the original will be
 636          * returned in all its glory with a warning comment appended.
 637          *
 638          * Either the external tidy program or the in-process tidy extension
 639          * will be used depending on availability. Override the default
 640          * $wgTidyInternal setting to disable the internal if it's not working.
 641          *
 642          * @param string $text Hideous HTML input
 643          * @return string Corrected HTML output
 644          * @public
 645          * @static
 646          */
 647         function tidy( $text ) {
 648                 global $wgTidyInternal;
 649                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 650 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 651 '<head><title>test</title></head><body>'.$text.'</body></html>';
 652                 if( $wgTidyInternal ) {
 653                         $correctedtext = self::internalTidy( $wrappedtext );
 654                 } else {
 655                         $correctedtext = self::externalTidy( $wrappedtext );
 656                 }
 657                 if( is_null( $correctedtext ) ) {
 658                         wfDebug( "Tidy error detected!\n" );
 659                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 660                 }
 661                 return $correctedtext;
 662         }
 663
 664         /**
 665          * Spawn an external HTML tidy process and get corrected markup back from it.
 666          *
 667          * @private
 668          * @static
 669          */
 670         function externalTidy( $text ) {
 671                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 672                 wfProfileIn( __METHOD__ );
 673
 674                 $cleansource = '';
 675                 $opts = ' -utf8';
 676
 677                 $descriptorspec = array(
 678                         0 => array('pipe', 'r'),
 679                         1 => array('pipe', 'w'),
 680                         2 => array('file', wfGetNull(), 'a')
 681                 );
 682                 $pipes = array();
 683                 if( function_exists('proc_open') ) {
 684                         $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 685                         if (is_resource($process)) {
 686                                 // Theoretically, this style of communication could cause a deadlock
 687                                 // here. If the stdout buffer fills up, then writes to stdin could
 688                                 // block. This doesn't appear to happen with tidy, because tidy only
 689                                 // writes to stdout after it's finished reading from stdin. Search
 690                                 // for tidyParseStdin and tidySaveStdout in console/tidy.c
 691                                 fwrite($pipes[0], $text);
 692                                 fclose($pipes[0]);
 693                                 while (!feof($pipes[1])) {
 694                                         $cleansource .= fgets($pipes[1], 1024);
 695                                 }
 696                                 fclose($pipes[1]);
 697                                 proc_close($process);
 698                         }
 699                 }
 700
 701                 wfProfileOut( __METHOD__ );
 702
 703                 if( $cleansource == '' && $text != '') {
 704                         // Some kind of error happened, so we couldn't get the corrected text.
 705                         // Just give up; we'll use the source text and append a warning.
 706                         return null;
 707                 } else {
 708                         return $cleansource;
 709                 }
 710         }
 711
 712         /**
 713          * Use the HTML tidy PECL extension to use the tidy library in-process,
 714          * saving the overhead of spawning a new process.
 715          *
 716          * 'pear install tidy' should be able to compile the extension module.
 717          *
 718          * @private
 719          * @static
 720          */
 721         function internalTidy( $text ) {
 722                 global $wgTidyConf, $IP, $wgDebugTidy;
 723                 wfProfileIn( __METHOD__ );
 724
 725                 $tidy = new tidy;
 726                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 727                 $tidy->cleanRepair();
 728                 if( $tidy->getStatus() == 2 ) {
 729                         // 2 is magic number for fatal error
 730                         // http://www.php.net/manual/en/function.tidy-get-status.php
 731                         $cleansource = null;
 732                 } else {
 733                         $cleansource = tidy_get_output( $tidy );
 734                 }
 735                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 736                         $cleansource .= "<!--\nTidy reports:\n" .
 737                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 738                                 "\n-->";
 739                 }
 740
 741                 wfProfileOut( __METHOD__ );
 742                 return $cleansource;
 743         }
 744
 745         /**
 746          * parse the wiki syntax used to render tables
 747          *
 748          * @private
 749          */
 750         function doTableStuff ( $text ) {
 751                 wfProfileIn( __METHOD__ );
 752
 753                 $lines = StringUtils::explode( "\n", $text );
 754                 $out = '';
 755                 $td_history = array (); // Is currently a td tag open?
 756                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 757                 $tr_history = array (); // Is currently a tr tag open?
 758                 $tr_attributes = array (); // history of tr attributes
 759                 $has_opened_tr = array(); // Did this table open a <tr> element?
 760                 $indent_level = 0; // indent level of the table
 761
 762                 foreach ( $lines as $outLine ) {
 763                         $line = trim( $outLine );
 764
 765                         if( $line == '' ) { // empty line, go to next line
 766                                 $out .= "\n";
 767                                 continue;
 768                         }
 769                         $first_character = $line[0];
 770                         $matches = array();
 771
 772                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 773                                 // First check if we are starting a new table
 774                                 $indent_level = strlen( $matches[1] );
 775
 776                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 777                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 778
 779                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 780                                 array_push ( $td_history , false );
 781                                 array_push ( $last_tag_history , '' );
 782                                 array_push ( $tr_history , false );
 783                                 array_push ( $tr_attributes , '' );
 784                                 array_push ( $has_opened_tr , false );
 785                         } else if ( count ( $td_history ) == 0 ) {
 786                                 // Don't do any of the following
 787                                 $out .= $outLine."\n";
 788                                 continue;
 789                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 790                                 // We are ending a table
 791                                 $line = '</table>' . substr ( $line , 2 );
 792                                 $last_tag = array_pop ( $last_tag_history );
 793
 794                                 if ( !array_pop ( $has_opened_tr ) ) {
 795                                         $line = "<tr><td></td></tr>{$line}";
 796                                 }
 797
 798                                 if ( array_pop ( $tr_history ) ) {
 799                                         $line = "</tr>{$line}";
 800                                 }
 801
 802                                 if ( array_pop ( $td_history ) ) {
 803                                         $line = "</{$last_tag}>{$line}";
 804                                 }
 805                                 array_pop ( $tr_attributes );
 806                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 807                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 808                                 // Now we have a table row
 809                                 $line = preg_replace( '#^\|-+#', '', $line );
 810
 811                                 // Whats after the tag is now only attributes
 812                                 $attributes = $this->mStripState->unstripBoth( $line );
 813                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 814                                 array_pop ( $tr_attributes );
 815                                 array_push ( $tr_attributes , $attributes );
 816
 817                                 $line = '';
 818                                 $last_tag = array_pop ( $last_tag_history );
 819                                 array_pop ( $has_opened_tr );
 820                                 array_push ( $has_opened_tr , true );
 821
 822                                 if ( array_pop ( $tr_history ) ) {
 823                                         $line = '</tr>';
 824                                 }
 825
 826                                 if ( array_pop ( $td_history ) ) {
 827                                         $line = "</{$last_tag}>{$line}";
 828                                 }
 829
 830                                 $outLine = $line;
 831                                 array_push ( $tr_history , false );
 832                                 array_push ( $td_history , false );
 833                                 array_push ( $last_tag_history , '' );
 834                         }
 835                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 836                                 // This might be cell elements, td, th or captions
 837                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 838                                         $first_character = '+';
 839                                         $line = substr ( $line , 1 );
 840                                 }
 841
 842                                 $line = substr ( $line , 1 );
 843
 844                                 if ( $first_character == '!' ) {
 845                                         $line = str_replace ( '!!' , '||' , $line );
 846                                 }
 847
 848                                 // Split up multiple cells on the same line.
 849                                 // FIXME : This can result in improper nesting of tags processed
 850                                 // by earlier parser steps, but should avoid splitting up eg
 851                                 // attribute values containing literal "||".
 852                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 853
 854                                 $outLine = '';
 855
 856                                 // Loop through each table cell
 857                                 foreach ( $cells as $cell )
 858                                 {
 859                                         $previous = '';
 860                                         if ( $first_character != '+' )
 861                                         {
 862                                                 $tr_after = array_pop ( $tr_attributes );
 863                                                 if ( !array_pop ( $tr_history ) ) {
 864                                                         $previous = "<tr{$tr_after}>\n";
 865                                                 }
 866                                                 array_push ( $tr_history , true );
 867                                                 array_push ( $tr_attributes , '' );
 868                                                 array_pop ( $has_opened_tr );
 869                                                 array_push ( $has_opened_tr , true );
 870                                         }
 871
 872                                         $last_tag = array_pop ( $last_tag_history );
 873
 874                                         if ( array_pop ( $td_history ) ) {
 875                                                 $previous = "</{$last_tag}>{$previous}";
 876                                         }
 877
 878                                         if ( $first_character == '|' ) {
 879                                                 $last_tag = 'td';
 880                                         } else if ( $first_character == '!' ) {
 881                                                 $last_tag = 'th';
 882                                         } else if ( $first_character == '+' ) {
 883                                                 $last_tag = 'caption';
 884                                         } else {
 885                                                 $last_tag = '';
 886                                         }
 887
 888                                         array_push ( $last_tag_history , $last_tag );
 889
 890                                         // A cell could contain both parameters and data
 891                                         $cell_data = explode ( '|' , $cell , 2 );
 892
 893                                         // Bug 553: Note that a '|' inside an invalid link should not
 894                                         // be mistaken as delimiting cell parameters
 895                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 896                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 897                                         } else if ( count ( $cell_data ) == 1 )
 898                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 899                                         else {
 900                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 901                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 902                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 903                                         }
 904
 905                                         $outLine .= $cell;
 906                                         array_push ( $td_history , true );
 907                                 }
 908                         }
 909                         $out .= $outLine . "\n";
 910                 }
 911
 912                 // Closing open td, tr && table
 913                 while ( count ( $td_history ) > 0 )
 914                 {
 915                         if ( array_pop ( $td_history ) ) {
 916                                 $out .= "</td>\n";
 917                         }
 918                         if ( array_pop ( $tr_history ) ) {
 919                                 $out .= "</tr>\n";
 920                         }
 921                         if ( !array_pop ( $has_opened_tr ) ) {
 922                                 $out .= "<tr><td></td></tr>\n" ;
 923                         }
 924
 925                         $out .= "</table>\n";
 926                 }
 927
 928                 // Remove trailing line-ending (b/c)
 929                 if ( substr( $out, -1 ) == "\n" ) {
 930                         $out = substr( $out, 0, -1 );
 931                 }
 932
 933                 // special case: don't return empty table
 934                 if( $out == "<table>\n<tr><td></td></tr>\n</table>" ) {
 935                         $out = '';
 936                 }
 937
 938                 wfProfileOut( __METHOD__ );
 939
 940                 return $out;
 941         }
 942
 943         /**
 944          * Helper function for parse() that transforms wiki markup into
 945          * HTML. Only called for $mOutputType == self::OT_HTML.
 946          *
 947          * @private
 948          */
 949         function internalParse( $text ) {
 950                 $isMain = true;
 951                 wfProfileIn( __METHOD__ );
 952
 953                 # Hook to suspend the parser in this state
 954                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 955                         wfProfileOut( __METHOD__ );
 956                         return $text ;
 957                 }
 958
 959                 $text = $this->replaceVariables( $text );
 960                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 961                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 962
 963                 // Tables need to come after variable replacement for things to work
 964                 // properly; putting them before other transformations should keep
 965                 // exciting things like link expansions from showing up in surprising
 966                 // places.
 967                 $text = $this->doTableStuff( $text );
 968
 969                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 970
 971                 $text = $this->doDoubleUnderscore( $text );
 972                 $text = $this->doHeadings( $text );
 973                 if($this->mOptions->getUseDynamicDates()) {
 974                         $df = DateFormatter::getInstance();
 975                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 976                 }
 977                 $text = $this->doAllQuotes( $text );
 978                 $text = $this->replaceInternalLinks( $text );
 979                 $text = $this->replaceExternalLinks( $text );
 980
 981                 # replaceInternalLinks may sometimes leave behind
 982                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 983                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 984
 985                 $text = $this->doMagicLinks( $text );
 986                 $text = $this->formatHeadings( $text, $isMain );
 987
 988                 wfProfileOut( __METHOD__ );
 989                 return $text;
 990         }
 991
 992         /**
 993          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 994          * magic external links.
 995          *
 996          * @private
 997          */
 998         function doMagicLinks( $text ) {
 999                 wfProfileIn( __METHOD__ );
1000                 $text = preg_replace_callback(
1001                         '!(?:                           # Start cases
1002                             <a.*?</a> |                 # Skip link text
1003                             <.*?> |                     # Skip stuff inside HTML elements
1004                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1005                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1006                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1007                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1008                                      [0-9Xx]                 # check digit
1009                                    \b)
1010                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1011                 wfProfileOut( __METHOD__ );
1012                 return $text;
1013         }
1014
1015         function magicLinkCallback( $m ) {
1016                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1017                         # Skip HTML element
1018                         return $m[0];
1019                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1020                         $isbn = $m[2];
1021                         $num = strtr( $isbn, array(
1022                                 '-' => '',
1023                                 ' ' => '',
1024                                 'x' => 'X',
1025                         ));
1026                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1027                         $text = '<a href="' .
1028                                 $titleObj->escapeLocalUrl() .
1029                                 "\" class=\"internal\">ISBN $isbn</a>";
1030                 } else {
1031                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1032                                 $keyword = 'RFC';
1033                                 $urlmsg = 'rfcurl';
1034                                 $id = $m[1];
1035                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1036                                 $keyword = 'PMID';
1037                                 $urlmsg = 'pubmedurl';
1038                                 $id = $m[1];
1039                         } else {
1040                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1041                                         substr($m[0], 0, 20 ) . '"' );
1042                         }
1043
1044                         $url = wfMsg( $urlmsg, $id);
1045                         $sk = $this->mOptions->getSkin();
1046                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1047                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1048                 }
1049                 return $text;
1050         }
1051
1052         /**
1053          * Parse headers and return html
1054          *
1055          * @private
1056          */
1057         function doHeadings( $text ) {
1058                 wfProfileIn( __METHOD__ );
1059                 for ( $i = 6; $i >= 1; --$i ) {
1060                         $h = str_repeat( '=', $i );
1061                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1062                           "<h$i>\\1</h$i>", $text );
1063                 }
1064                 wfProfileOut( __METHOD__ );
1065                 return $text;
1066         }
1067
1068         /**
1069          * Replace single quotes with HTML markup
1070          * @private
1071          * @return string the altered text
1072          */
1073         function doAllQuotes( $text ) {
1074                 wfProfileIn( __METHOD__ );
1075                 $outtext = '';
1076                 $lines = StringUtils::explode( "\n", $text );
1077                 foreach ( $lines as $line ) {
1078                         $outtext .= $this->doQuotes( $line ) . "\n";
1079                 }
1080                 $outtext = substr($outtext, 0,-1);
1081                 wfProfileOut( __METHOD__ );
1082                 return $outtext;
1083         }
1084
1085         /**
1086          * Helper function for doAllQuotes()
1087          */
1088         public function doQuotes( $text ) {
1089                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1090                 if ( count( $arr ) == 1 )
1091                         return $text;
1092                 else
1093                 {
1094                         # First, do some preliminary work. This may shift some apostrophes from
1095                         # being mark-up to being text. It also counts the number of occurrences
1096                         # of bold and italics mark-ups.
1097                         $i = 0;
1098                         $numbold = 0;
1099                         $numitalics = 0;
1100                         foreach ( $arr as $r )
1101                         {
1102                                 if ( ( $i % 2 ) == 1 )
1103                                 {
1104                                         # If there are ever four apostrophes, assume the first is supposed to
1105                                         # be text, and the remaining three constitute mark-up for bold text.
1106                                         if ( strlen( $arr[$i] ) == 4 )
1107                                         {
1108                                                 $arr[$i-1] .= "'";
1109                                                 $arr[$i] = "'''";
1110                                         }
1111                                         # If there are more than 5 apostrophes in a row, assume they're all
1112                                         # text except for the last 5.
1113                                         else if ( strlen( $arr[$i] ) > 5 )
1114                                         {
1115                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1116                                                 $arr[$i] = "'''''";
1117                                         }
1118                                         # Count the number of occurrences of bold and italics mark-ups.
1119                                         # We are not counting sequences of five apostrophes.
1120                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1121                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1122                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1123                                 }
1124                                 $i++;
1125                         }
1126
1127                         # If there is an odd number of both bold and italics, it is likely
1128                         # that one of the bold ones was meant to be an apostrophe followed
1129                         # by italics. Which one we cannot know for certain, but it is more
1130                         # likely to be one that has a single-letter word before it.
1131                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1132                         {
1133                                 $i = 0;
1134                                 $firstsingleletterword = -1;
1135                                 $firstmultiletterword = -1;
1136                                 $firstspace = -1;
1137                                 foreach ( $arr as $r )
1138                                 {
1139                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1140                                         {
1141                                                 $x1 = substr ($arr[$i-1], -1);
1142                                                 $x2 = substr ($arr[$i-1], -2, 1);
1143                                                 if ($x1 == ' ') {
1144                                                         if ($firstspace == -1) $firstspace = $i;
1145                                                 } else if ($x2 == ' ') {
1146                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1147                                                 } else {
1148                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1149                                                 }
1150                                         }
1151                                         $i++;
1152                                 }
1153
1154                                 # If there is a single-letter word, use it!
1155                                 if ($firstsingleletterword > -1)
1156                                 {
1157                                         $arr [ $firstsingleletterword ] = "''";
1158                                         $arr [ $firstsingleletterword-1 ] .= "'";
1159                                 }
1160                                 # If not, but there's a multi-letter word, use that one.
1161                                 else if ($firstmultiletterword > -1)
1162                                 {
1163                                         $arr [ $firstmultiletterword ] = "''";
1164                                         $arr [ $firstmultiletterword-1 ] .= "'";
1165                                 }
1166                                 # ... otherwise use the first one that has neither.
1167                                 # (notice that it is possible for all three to be -1 if, for example,
1168                                 # there is only one pentuple-apostrophe in the line)
1169                                 else if ($firstspace > -1)
1170                                 {
1171                                         $arr [ $firstspace ] = "''";
1172                                         $arr [ $firstspace-1 ] .= "'";
1173                                 }
1174                         }
1175
1176                         # Now let's actually convert our apostrophic mush to HTML!
1177                         $output = '';
1178                         $buffer = '';
1179                         $state = '';
1180                         $i = 0;
1181                         foreach ($arr as $r)
1182                         {
1183                                 if (($i % 2) == 0)
1184                                 {
1185                                         if ($state == 'both')
1186                                                 $buffer .= $r;
1187                                         else
1188                                                 $output .= $r;
1189                                 }
1190                                 else
1191                                 {
1192                                         if (strlen ($r) == 2)
1193                                         {
1194                                                 if ($state == 'i')
1195                                                 { $output .= '</i>'; $state = ''; }
1196                                                 else if ($state == 'bi')
1197                                                 { $output .= '</i>'; $state = 'b'; }
1198                                                 else if ($state == 'ib')
1199                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1200                                                 else if ($state == 'both')
1201                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1202                                                 else # $state can be 'b' or ''
1203                                                 { $output .= '<i>'; $state .= 'i'; }
1204                                         }
1205                                         else if (strlen ($r) == 3)
1206                                         {
1207                                                 if ($state == 'b')
1208                                                 { $output .= '</b>'; $state = ''; }
1209                                                 else if ($state == 'bi')
1210                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1211                                                 else if ($state == 'ib')
1212                                                 { $output .= '</b>'; $state = 'i'; }
1213                                                 else if ($state == 'both')
1214                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1215                                                 else # $state can be 'i' or ''
1216                                                 { $output .= '<b>'; $state .= 'b'; }
1217                                         }
1218                                         else if (strlen ($r) == 5)
1219                                         {
1220                                                 if ($state == 'b')
1221                                                 { $output .= '</b><i>'; $state = 'i'; }
1222                                                 else if ($state == 'i')
1223                                                 { $output .= '</i><b>'; $state = 'b'; }
1224                                                 else if ($state == 'bi')
1225                                                 { $output .= '</i></b>'; $state = ''; }
1226                                                 else if ($state == 'ib')
1227                                                 { $output .= '</b></i>'; $state = ''; }
1228                                                 else if ($state == 'both')
1229                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1230                                                 else # ($state == '')
1231                                                 { $buffer = ''; $state = 'both'; }
1232                                         }
1233                                 }
1234                                 $i++;
1235                         }
1236                         # Now close all remaining tags.  Notice that the order is important.
1237                         if ($state == 'b' || $state == 'ib')
1238                                 $output .= '</b>';
1239                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1240                                 $output .= '</i>';
1241                         if ($state == 'bi')
1242                                 $output .= '</b>';
1243                         # There might be lonely ''''', so make sure we have a buffer
1244                         if ($state == 'both' && $buffer)
1245                                 $output .= '<b><i>'.$buffer.'</i></b>';
1246                         return $output;
1247                 }
1248         }
1249
1250         /**
1251          * Replace external links
1252          *
1253          * Note: this is all very hackish and the order of execution matters a lot.
1254          * Make sure to run maintenance/parserTests.php if you change this code.
1255          *
1256          * @private
1257          */
1258         function replaceExternalLinks( $text ) {
1259                 global $wgContLang;
1260                 wfProfileIn( __METHOD__ );
1261
1262                 $sk = $this->mOptions->getSkin();
1263
1264                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1265
1266                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1267
1268                 $i = 0;
1269                 while ( $i<count( $bits ) ) {
1270                         $url = $bits[$i++];
1271                         $protocol = $bits[$i++];
1272                         $text = $bits[$i++];
1273                         $trail = $bits[$i++];
1274
1275                         # The characters '<' and '>' (which were escaped by
1276                         # removeHTMLtags()) should not be included in
1277                         # URLs, per RFC 2396.
1278                         $m2 = array();
1279                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1280                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1281                                 $url = substr($url, 0, $m2[0][1]);
1282                         }
1283
1284                         # If the link text is an image URL, replace it with an <img> tag
1285                         # This happened by accident in the original parser, but some people used it extensively
1286                         $img = $this->maybeMakeExternalImage( $text );
1287                         if ( $img !== false ) {
1288                                 $text = $img;
1289                         }
1290
1291                         $dtrail = '';
1292
1293                         # Set linktype for CSS - if URL==text, link is essentially free
1294                         $linktype = ($text == $url) ? 'free' : 'text';
1295
1296                         # No link text, e.g. [http://domain.tld/some.link]
1297                         if ( $text == '' ) {
1298                                 # Autonumber if allowed. See bug #5918
1299                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1300                                         $text = '[' . ++$this->mAutonumber . ']';
1301                                         $linktype = 'autonumber';
1302                                 } else {
1303                                         # Otherwise just use the URL
1304                                         $text = htmlspecialchars( $url );
1305                                         $linktype = 'free';
1306                                 }
1307                         } else {
1308                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1309                                 # Check for trail
1310                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1311                         }
1312
1313                         $text = $wgContLang->markNoConversion($text);
1314
1315                         $url = Sanitizer::cleanUrl( $url );
1316
1317                         # Process the trail (i.e. everything after this link up until start of the next link),
1318                         # replacing any non-bracketed links
1319                         $trail = $this->replaceFreeExternalLinks( $trail );
1320
1321                         # Use the encoded URL
1322                         # This means that users can paste URLs directly into the text
1323                         # Funny characters like &ouml; aren't valid in URLs anyway
1324                         # This was changed in August 2004
1325                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1326
1327                         # Register link in the output object.
1328                         # Replace unnecessary URL escape codes with the referenced character
1329                         # This prevents spammers from hiding links from the filters
1330                         $pasteurized = self::replaceUnusualEscapes( $url );
1331                         $this->mOutput->addExternalLink( $pasteurized );
1332                 }
1333
1334                 wfProfileOut( __METHOD__ );
1335                 return $s;
1336         }
1337
1338         /**
1339          * Replace anything that looks like a URL with a link
1340          * @private
1341          */
1342         function replaceFreeExternalLinks( $text ) {
1343                 global $wgContLang;
1344                 wfProfileIn( __METHOD__ );
1345
1346                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1347                 $s = array_shift( $bits );
1348                 $i = 0;
1349
1350                 $sk = $this->mOptions->getSkin();
1351
1352                 while ( $i < count( $bits ) ){
1353                         $protocol = $bits[$i++];
1354                         $remainder = $bits[$i++];
1355
1356                         $m = array();
1357                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1358                                 # Found some characters after the protocol that look promising
1359                                 $url = $protocol . $m[1];
1360                                 $trail = $m[2];
1361
1362                                 # special case: handle urls as url args:
1363                                 # http://www.example.com/foo?=http://www.example.com/bar
1364                                 if(strlen($trail) == 0 &&
1365                                         isset($bits[$i]) &&
1366                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1367                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1368                                 {
1369                                         # add protocol, arg
1370                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1371                                         $i += 2;
1372                                         $trail = $m[2];
1373                                 }
1374
1375                                 # The characters '<' and '>' (which were escaped by
1376                                 # removeHTMLtags()) should not be included in
1377                                 # URLs, per RFC 2396.
1378                                 $m2 = array();
1379                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1380                                         $trail = substr($url, $m2[0][1]) . $trail;
1381                                         $url = substr($url, 0, $m2[0][1]);
1382                                 }
1383
1384                                 # Move trailing punctuation to $trail
1385                                 $sep = ',;\.:!?';
1386                                 # If there is no left bracket, then consider right brackets fair game too
1387                                 if ( strpos( $url, '(' ) === false ) {
1388                                         $sep .= ')';
1389                                 }
1390
1391                                 $numSepChars = strspn( strrev( $url ), $sep );
1392                                 if ( $numSepChars ) {
1393                                         $trail = substr( $url, -$numSepChars ) . $trail;
1394                                         $url = substr( $url, 0, -$numSepChars );
1395                                 }
1396
1397                                 $url = Sanitizer::cleanUrl( $url );
1398
1399                                 # Is this an external image?
1400                                 $text = $this->maybeMakeExternalImage( $url );
1401                                 if ( $text === false ) {
1402                                         # Not an image, make a link
1403                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1404                                         # Register it in the output object...
1405                                         # Replace unnecessary URL escape codes with their equivalent characters
1406                                         $pasteurized = self::replaceUnusualEscapes( $url );
1407                                         $this->mOutput->addExternalLink( $pasteurized );
1408                                 }
1409                                 $s .= $text . $trail;
1410                         } else {
1411                                 $s .= $protocol . $remainder;
1412                         }
1413                 }
1414                 wfProfileOut( __METHOD__ );
1415                 return $s;
1416         }
1417
1418         /**
1419          * Replace unusual URL escape codes with their equivalent characters
1420          * @param string
1421          * @return string
1422          * @static
1423          * @todo  This can merge genuinely required bits in the path or query string,
1424          *        breaking legit URLs. A proper fix would treat the various parts of
1425          *        the URL differently; as a workaround, just use the output for
1426          *        statistical records, not for actual linking/output.
1427          */
1428         static function replaceUnusualEscapes( $url ) {
1429                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1430                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1431         }
1432
1433         /**
1434          * Callback function used in replaceUnusualEscapes().
1435          * Replaces unusual URL escape codes with their equivalent character
1436          * @static
1437          * @private
1438          */
1439         private static function replaceUnusualEscapesCallback( $matches ) {
1440                 $char = urldecode( $matches[0] );
1441                 $ord = ord( $char );
1442                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1443                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1444                         // No, shouldn't be escaped
1445                         return $char;
1446                 } else {
1447                         // Yes, leave it escaped
1448                         return $matches[0];
1449                 }
1450         }
1451
1452         /**
1453          * make an image if it's allowed, either through the global
1454          * option or through the exception
1455          * @private
1456          */
1457         function maybeMakeExternalImage( $url ) {
1458                 $sk = $this->mOptions->getSkin();
1459                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1460                 $imagesexception = !empty($imagesfrom);
1461                 $text = false;
1462                 if ( $this->mOptions->getAllowExternalImages()
1463                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1464                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1465                                 # Image found
1466                                 $text = $sk->makeExternalImage( $url );
1467                         }
1468                 }
1469                 return $text;
1470         }
1471
1472         /**
1473          * Process [[ ]] wikilinks
1474          * @return processed text
1475          *
1476          * @private
1477          */
1478         function replaceInternalLinks( $s ) {
1479                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1480                 return $s;
1481         }
1482
1483         /**
1484          * Process [[ ]] wikilinks
1485          * @return LinkHolderArray
1486          *
1487          * @private
1488          */
1489         function replaceInternalLinks2( &$s ) {
1490                 global $wgContLang;
1491
1492                 wfProfileIn( __METHOD__ );
1493
1494                 wfProfileIn( __METHOD__.'-setup' );
1495                 static $tc = FALSE, $e1, $e1_img;
1496                 # the % is needed to support urlencoded titles as well
1497                 if ( !$tc ) {
1498                         $tc = Title::legalChars() . '#%';
1499                         # Match a link having the form [[namespace:link|alternate]]trail
1500                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1501                         # Match cases where there is no "]]", which might still be images
1502                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1503                 }
1504
1505                 $sk = $this->mOptions->getSkin();
1506                 $holders = new LinkHolderArray( $this );
1507
1508                 #split the entire text string on occurences of [[
1509                 $a = StringUtils::explode( '[[', ' ' . $s );
1510                 #get the first element (all text up to first [[), and remove the space we added
1511                 $s = $a->current();
1512                 $a->next();
1513                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1514                 $s = substr( $s, 1 );
1515
1516                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1517                 $e2 = null;
1518                 if ( $useLinkPrefixExtension ) {
1519                         # Match the end of a line for a word that's not followed by whitespace,
1520                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1521                         $e2 = wfMsgForContent( 'linkprefix' );
1522                 }
1523
1524                 if( is_null( $this->mTitle ) ) {
1525                         wfProfileOut( __METHOD__.'-setup' );
1526                         wfProfileOut( __METHOD__ );
1527                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1528                 }
1529                 $nottalk = !$this->mTitle->isTalkPage();
1530
1531                 if ( $useLinkPrefixExtension ) {
1532                         $m = array();
1533                         if ( preg_match( $e2, $s, $m ) ) {
1534                                 $first_prefix = $m[2];
1535                         } else {
1536                                 $first_prefix = false;
1537                         }
1538                 } else {
1539                         $prefix = '';
1540                 }
1541
1542                 if($wgContLang->hasVariants()) {
1543                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1544                 } else {
1545                         $selflink = array($this->mTitle->getPrefixedText());
1546                 }
1547                 $useSubpages = $this->areSubpagesAllowed();
1548                 wfProfileOut( __METHOD__.'-setup' );
1549
1550                 # Loop for each link
1551                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1552                         # Check for excessive memory usage
1553                         if ( $holders->isBig() ) {
1554                                 # Too big
1555                                 # Do the existence check, replace the link holders and clear the array
1556                                 $holders->replace( $s );
1557                                 $holders->clear();
1558                         }
1559
1560                         if ( $useLinkPrefixExtension ) {
1561                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1562                                 if ( preg_match( $e2, $s, $m ) ) {
1563                                         $prefix = $m[2];
1564                                         $s = $m[1];
1565                                 } else {
1566                                         $prefix='';
1567                                 }
1568                                 # first link
1569                                 if($first_prefix) {
1570                                         $prefix = $first_prefix;
1571                                         $first_prefix = false;
1572                                 }
1573                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1574                         }
1575
1576                         $might_be_img = false;
1577
1578                         wfProfileIn( __METHOD__."-e1" );
1579                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1580                                 $text = $m[2];
1581                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1582                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1583                                 # the real problem is with the $e1 regex
1584                                 # See bug 1300.
1585                                 #
1586                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1587                                 # and no image is in sight. See bug 2095.
1588                                 #
1589                                 if( $text !== '' &&
1590                                         substr( $m[3], 0, 1 ) === ']' &&
1591                                         strpos($text, '[') !== false
1592                                 )
1593                                 {
1594                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1595                                         $m[3] = substr( $m[3], 1 );
1596                                 }
1597                                 # fix up urlencoded title texts
1598                                 if( strpos( $m[1], '%' ) !== false ) {
1599                                         # Should anchors '#' also be rejected?
1600                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1601                                 }
1602                                 $trail = $m[3];
1603                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1604                                 $might_be_img = true;
1605                                 $text = $m[2];
1606                                 if ( strpos( $m[1], '%' ) !== false ) {
1607                                         $m[1] = urldecode($m[1]);
1608                                 }
1609                                 $trail = "";
1610                         } else { # Invalid form; output directly
1611                                 $s .= $prefix . '[[' . $line ;
1612                                 wfProfileOut( __METHOD__."-e1" );
1613                                 continue;
1614                         }
1615                         wfProfileOut( __METHOD__."-e1" );
1616                         wfProfileIn( __METHOD__."-misc" );
1617
1618                         # Don't allow internal links to pages containing
1619                         # PROTO: where PROTO is a valid URL protocol; these
1620                         # should be external links.
1621                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1622                                 $s .= $prefix . '[[' . $line ;
1623                                 wfProfileOut( __METHOD__."-misc" );
1624                                 continue;
1625                         }
1626
1627                         # Make subpage if necessary
1628                         if( $useSubpages ) {
1629                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1630                         } else {
1631                                 $link = $m[1];
1632                         }
1633
1634                         $noforce = (substr($m[1], 0, 1) != ':');
1635                         if (!$noforce) {
1636                                 # Strip off leading ':'
1637                                 $link = substr($link, 1);
1638                         }
1639
1640                         wfProfileOut( __METHOD__."-misc" );
1641                         wfProfileIn( __METHOD__."-title" );
1642                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1643                         if( !$nt ) {
1644                                 $s .= $prefix . '[[' . $line;
1645                                 wfProfileOut( __METHOD__."-title" );
1646                                 continue;
1647                         }
1648
1649                         $ns = $nt->getNamespace();
1650                         $iw = $nt->getInterWiki();
1651                         wfProfileOut( __METHOD__."-title" );
1652
1653                         if ($might_be_img) { # if this is actually an invalid link
1654                                 wfProfileIn( __METHOD__."-might_be_img" );
1655                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1656                                         $found = false;
1657                                         while ( true ) {
1658                                                 #look at the next 'line' to see if we can close it there
1659                                                 $a->next();
1660                                                 $next_line = $a->current();
1661                                                 if ( $next_line === false || $next_line === null ) {
1662                                                         break;
1663                                                 }
1664                                                 $m = explode( ']]', $next_line, 3 );
1665                                                 if ( count( $m ) == 3 ) {
1666                                                         # the first ]] closes the inner link, the second the image
1667                                                         $found = true;
1668                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1669                                                         $trail = $m[2];
1670                                                         break;
1671                                                 } elseif ( count( $m ) == 2 ) {
1672                                                         #if there's exactly one ]] that's fine, we'll keep looking
1673                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1674                                                 } else {
1675                                                         #if $next_line is invalid too, we need look no further
1676                                                         $text .= '[[' . $next_line;
1677                                                         break;
1678                                                 }
1679                                         }
1680                                         if ( !$found ) {
1681                                                 # we couldn't find the end of this imageLink, so output it raw
1682                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1683                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1684                                                 $s .= "{$prefix}[[$link|$text";
1685                                                 # note: no $trail, because without an end, there *is* no trail
1686                                                 wfProfileOut( __METHOD__."-might_be_img" );
1687                                                 continue;
1688                                         }
1689                                 } else { #it's not an image, so output it raw
1690                                         $s .= "{$prefix}[[$link|$text";
1691                                         # note: no $trail, because without an end, there *is* no trail
1692                                         wfProfileOut( __METHOD__."-might_be_img" );
1693                                         continue;
1694                                 }
1695                                 wfProfileOut( __METHOD__."-might_be_img" );
1696                         }
1697
1698                         $wasblank = ( '' == $text );
1699                         if( $wasblank ) $text = $link;
1700
1701                         # Link not escaped by : , create the various objects
1702                         if( $noforce ) {
1703
1704                                 # Interwikis
1705                                 wfProfileIn( __METHOD__."-interwiki" );
1706                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1707                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1708                                         $s = rtrim($s . $prefix);
1709                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1710                                         wfProfileOut( __METHOD__."-interwiki" );
1711                                         continue;
1712                                 }
1713                                 wfProfileOut( __METHOD__."-interwiki" );
1714
1715                                 if ( $ns == NS_IMAGE ) {
1716                                         wfProfileIn( __METHOD__."-image" );
1717                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1718                                                 # recursively parse links inside the image caption
1719                                                 # actually, this will parse them in any other parameters, too,
1720                                                 # but it might be hard to fix that, and it doesn't matter ATM
1721                                                 $text = $this->replaceExternalLinks($text);
1722                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1723
1724                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1725                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1726                                         }
1727                                         $this->mOutput->addImage( $nt->getDBkey() );
1728                                         wfProfileOut( __METHOD__."-image" );
1729                                         continue;
1730
1731                                 }
1732
1733                                 if ( $ns == NS_CATEGORY ) {
1734                                         wfProfileIn( __METHOD__."-category" );
1735                                         $s = rtrim($s . "\n"); # bug 87
1736
1737                                         if ( $wasblank ) {
1738                                                 $sortkey = $this->getDefaultSort();
1739                                         } else {
1740                                                 $sortkey = $text;
1741                                         }
1742                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1743                                         $sortkey = str_replace( "\n", '', $sortkey );
1744                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1745                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1746
1747                                         /**
1748                                          * Strip the whitespace Category links produce, see bug 87
1749                                          * @todo We might want to use trim($tmp, "\n") here.
1750                                          */
1751                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1752
1753                                         wfProfileOut( __METHOD__."-category" );
1754                                         continue;
1755                                 }
1756                         }
1757
1758                         # Self-link checking
1759                         if( $nt->getFragment() === '' && $nt->getNamespace() != NS_SPECIAL ) {
1760                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1761                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1762                                         continue;
1763                                 }
1764                         }
1765
1766                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1767                         if( $ns == NS_MEDIA ) {
1768                                 # Give extensions a chance to select the file revision for us
1769                                 $skip = $time = false;
1770                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1771                                 if ( $skip ) {
1772                                         $link = $sk->link( $nt );
1773                                 } else {
1774                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1775                                 }
1776                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1777                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1778                                 $this->mOutput->addImage( $nt->getDBkey() );
1779                                 continue;
1780                         } elseif( $ns == NS_SPECIAL ) {
1781                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1782                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1783                                 } else {
1784                                         $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1785                                 }
1786                                 continue;
1787                         } elseif( $ns == NS_IMAGE ) {
1788                                 $img = wfFindFile( $nt );
1789                                 if( $img ) {
1790                                         // Force a blue link if the file exists; may be a remote
1791                                         // upload on the shared repository, and we want to see its
1792                                         // auto-generated page.
1793                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1794                                         $this->mOutput->addLink( $nt );
1795                                         continue;
1796                                 }
1797                         }
1798                         $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1799                 }
1800                 wfProfileOut( __METHOD__ );
1801                 return $holders;
1802         }
1803
1804         /**
1805          * Make a link placeholder. The text returned can be later resolved to a real link with
1806          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1807          * parsing of interwiki links, and secondly to allow all existence checks and
1808          * article length checks (for stub links) to be bundled into a single query.
1809          *
1810          * @deprecated
1811          */
1812         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1813                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1814         }
1815
1816         /**
1817          * Render a forced-blue link inline; protect against double expansion of
1818          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1819          * Since this little disaster has to split off the trail text to avoid
1820          * breaking URLs in the following text without breaking trails on the
1821          * wiki links, it's been made into a horrible function.
1822          *
1823          * @param Title $nt
1824          * @param string $text
1825          * @param string $query
1826          * @param string $trail
1827          * @param string $prefix
1828          * @return string HTML-wikitext mix oh yuck
1829          */
1830         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1831                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1832                 $sk = $this->mOptions->getSkin();
1833                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1834                 return $this->armorLinks( $link ) . $trail;
1835         }
1836
1837         /**
1838          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1839          * going to go through further parsing steps before inline URL expansion.
1840          *
1841          * In particular this is important when using action=render, which causes
1842          * full URLs to be included.
1843          *
1844          * Oh man I hate our multi-layer parser!
1845          *
1846          * @param string more-or-less HTML
1847          * @return string less-or-more HTML with NOPARSE bits
1848          */
1849         function armorLinks( $text ) {
1850                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1851                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1852         }
1853
1854         /**
1855          * Return true if subpage links should be expanded on this page.
1856          * @return bool
1857          */
1858         function areSubpagesAllowed() {
1859                 # Some namespaces don't allow subpages
1860                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1861         }
1862
1863         /**
1864          * Handle link to subpage if necessary
1865          * @param string $target the source of the link
1866          * @param string &$text the link text, modified as necessary
1867          * @return string the full name of the link
1868          * @private
1869          */
1870         function maybeDoSubpageLink($target, &$text) {
1871                 # Valid link forms:
1872                 # Foobar -- normal
1873                 # :Foobar -- override special treatment of prefix (images, language links)
1874                 # /Foobar -- convert to CurrentPage/Foobar
1875                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1876                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1877                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1878
1879                 wfProfileIn( __METHOD__ );
1880                 $ret = $target; # default return value is no change
1881
1882                 # Some namespaces don't allow subpages,
1883                 # so only perform processing if subpages are allowed
1884                 if( $this->areSubpagesAllowed() ) {
1885                         $hash = strpos( $target, '#' );
1886                         if( $hash !== false ) {
1887                                 $suffix = substr( $target, $hash );
1888                                 $target = substr( $target, 0, $hash );
1889                         } else {
1890                                 $suffix = '';
1891                         }
1892                         # bug 7425
1893                         $target = trim( $target );
1894                         # Look at the first character
1895                         if( $target != '' && $target{0} == '/' ) {
1896                                 # / at end means we don't want the slash to be shown
1897                                 $m = array();
1898                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1899                                 if( $trailingSlashes ) {
1900                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1901                                 } else {
1902                                         $noslash = substr( $target, 1 );
1903                                 }
1904
1905                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1906                                 if( '' === $text ) {
1907                                         $text = $target . $suffix;
1908                                 } # this might be changed for ugliness reasons
1909                         } else {
1910                                 # check for .. subpage backlinks
1911                                 $dotdotcount = 0;
1912                                 $nodotdot = $target;
1913                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1914                                         ++$dotdotcount;
1915                                         $nodotdot = substr( $nodotdot, 3 );
1916                                 }
1917                                 if($dotdotcount > 0) {
1918                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1919                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1920                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1921                                                 # / at the end means don't show full path
1922                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1923                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1924                                                         if( '' === $text ) {
1925                                                                 $text = $nodotdot . $suffix;
1926                                                         }
1927                                                 }
1928                                                 $nodotdot = trim( $nodotdot );
1929                                                 if( $nodotdot != '' ) {
1930                                                         $ret .= '/' . $nodotdot;
1931                                                 }
1932                                                 $ret .= $suffix;
1933                                         }
1934                                 }
1935                         }
1936                 }
1937
1938                 wfProfileOut( __METHOD__ );
1939                 return $ret;
1940         }
1941
1942         /**#@+
1943          * Used by doBlockLevels()
1944          * @private
1945          */
1946         /* private */ function closeParagraph() {
1947                 $result = '';
1948                 if ( '' != $this->mLastSection ) {
1949                         $result = '</' . $this->mLastSection  . ">\n";
1950                 }
1951                 $this->mInPre = false;
1952                 $this->mLastSection = '';
1953                 return $result;
1954         }
1955         # getCommon() returns the length of the longest common substring
1956         # of both arguments, starting at the beginning of both.
1957         #
1958         /* private */ function getCommon( $st1, $st2 ) {
1959                 $fl = strlen( $st1 );
1960                 $shorter = strlen( $st2 );
1961                 if ( $fl < $shorter ) { $shorter = $fl; }
1962
1963                 for ( $i = 0; $i < $shorter; ++$i ) {
1964                         if ( $st1{$i} != $st2{$i} ) { break; }
1965                 }
1966                 return $i;
1967         }
1968         # These next three functions open, continue, and close the list
1969         # element appropriate to the prefix character passed into them.
1970         #
1971         /* private */ function openList( $char ) {
1972                 $result = $this->closeParagraph();
1973
1974                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1975                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1976                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1977                 else if ( ';' == $char ) {
1978                         $result .= '<dl><dt>';
1979                         $this->mDTopen = true;
1980                 }
1981                 else { $result = '<!-- ERR 1 -->'; }
1982
1983                 return $result;
1984         }
1985
1986         /* private */ function nextItem( $char ) {
1987                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1988                 else if ( ':' == $char || ';' == $char ) {
1989                         $close = '</dd>';
1990                         if ( $this->mDTopen ) { $close = '</dt>'; }
1991                         if ( ';' == $char ) {
1992                                 $this->mDTopen = true;
1993                                 return $close . '<dt>';
1994                         } else {
1995                                 $this->mDTopen = false;
1996                                 return $close . '<dd>';
1997                         }
1998                 }
1999                 return '<!-- ERR 2 -->';
2000         }
2001
2002         /* private */ function closeList( $char ) {
2003                 if ( '*' == $char ) { $text = '</li></ul>'; }
2004                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2005                 else if ( ':' == $char ) {
2006                         if ( $this->mDTopen ) {
2007                                 $this->mDTopen = false;
2008                                 $text = '</dt></dl>';
2009                         } else {
2010                                 $text = '</dd></dl>';
2011                         }
2012                 }
2013                 else {  return '<!-- ERR 3 -->'; }
2014                 return $text."\n";
2015         }
2016         /**#@-*/
2017
2018         /**
2019          * Make lists from lines starting with ':', '*', '#', etc.
2020          *
2021          * @private
2022          * @return string the lists rendered as HTML
2023          */
2024         function doBlockLevels( $text, $linestart ) {
2025                 wfProfileIn( __METHOD__ );
2026
2027                 # Parsing through the text line by line.  The main thing
2028                 # happening here is handling of block-level elements p, pre,
2029                 # and making lists from lines starting with * # : etc.
2030                 #
2031                 $textLines = StringUtils::explode( "\n", $text );
2032
2033                 $lastPrefix = $output = '';
2034                 $this->mDTopen = $inBlockElem = false;
2035                 $prefixLength = 0;
2036                 $paragraphStack = false;
2037
2038                 foreach ( $textLines as $oLine ) {
2039                         # Fix up $linestart
2040                         if ( !$linestart ) {
2041                                 $output .= $oLine;
2042                                 $linestart = true;
2043                                 continue;
2044                         }
2045
2046                         $lastPrefixLength = strlen( $lastPrefix );
2047                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2048                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2049                         if ( !$this->mInPre ) {
2050                                 # Multiple prefixes may abut each other for nested lists.
2051                                 $prefixLength = strspn( $oLine, '*#:;' );
2052                                 $prefix = substr( $oLine, 0, $prefixLength );
2053
2054                                 # eh?
2055                                 $prefix2 = str_replace( ';', ':', $prefix );
2056                                 $t = substr( $oLine, $prefixLength );
2057                                 $this->mInPre = (bool)$preOpenMatch;
2058                         } else {
2059                                 # Don't interpret any other prefixes in preformatted text
2060                                 $prefixLength = 0;
2061                                 $prefix = $prefix2 = '';
2062                                 $t = $oLine;
2063                         }
2064
2065                         # List generation
2066                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2067                                 # Same as the last item, so no need to deal with nesting or opening stuff
2068                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2069                                 $paragraphStack = false;
2070
2071                                 if ( substr( $prefix, -1 ) == ';') {
2072                                         # The one nasty exception: definition lists work like this:
2073                                         # ; title : definition text
2074                                         # So we check for : in the remainder text to split up the
2075                                         # title and definition, without b0rking links.
2076                                         $term = $t2 = '';
2077                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2078                                                 $t = $t2;
2079                                                 $output .= $term . $this->nextItem( ':' );
2080                                         }
2081                                 }
2082                         } elseif( $prefixLength || $lastPrefixLength ) {
2083                                 # Either open or close a level...
2084                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2085                                 $paragraphStack = false;
2086
2087                                 while( $commonPrefixLength < $lastPrefixLength ) {
2088                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2089                                         --$lastPrefixLength;
2090                                 }
2091                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2092                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2093                                 }
2094                                 while ( $prefixLength > $commonPrefixLength ) {
2095                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2096                                         $output .= $this->openList( $char );
2097
2098                                         if ( ';' == $char ) {
2099                                                 # FIXME: This is dupe of code above
2100                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2101                                                         $t = $t2;
2102                                                         $output .= $term . $this->nextItem( ':' );
2103                                                 }
2104                                         }
2105                                         ++$commonPrefixLength;
2106                                 }
2107                                 $lastPrefix = $prefix2;
2108                         }
2109                         if( 0 == $prefixLength ) {
2110                                 wfProfileIn( __METHOD__."-paragraph" );
2111                                 # No prefix (not in list)--go to paragraph mode
2112                                 // XXX: use a stack for nestable elements like span, table and div
2113                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2114                                 $closematch = preg_match(
2115                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2116                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2117                                 if ( $openmatch or $closematch ) {
2118                                         $paragraphStack = false;
2119                                         # TODO bug 5718: paragraph closed
2120                                         $output .= $this->closeParagraph();
2121                                         if ( $preOpenMatch and !$preCloseMatch ) {
2122                                                 $this->mInPre = true;
2123                                         }
2124                                         if ( $closematch ) {
2125                                                 $inBlockElem = false;
2126                                         } else {
2127                                                 $inBlockElem = true;
2128                                         }
2129                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2130                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2131                                                 // pre
2132                                                 if ($this->mLastSection != 'pre') {
2133                                                         $paragraphStack = false;
2134                                                         $output .= $this->closeParagraph().'<pre>';
2135                                                         $this->mLastSection = 'pre';
2136                                                 }
2137                                                 $t = substr( $t, 1 );
2138                                         } else {
2139                                                 // paragraph
2140                                                 if ( '' == trim($t) ) {
2141                                                         if ( $paragraphStack ) {
2142                                                                 $output .= $paragraphStack.'<br />';
2143                                                                 $paragraphStack = false;
2144                                                                 $this->mLastSection = 'p';
2145                                                         } else {
2146                                                                 if ($this->mLastSection != 'p' ) {
2147                                                                         $output .= $this->closeParagraph();
2148                                                                         $this->mLastSection = '';
2149                                                                         $paragraphStack = '<p>';
2150                                                                 } else {
2151                                                                         $paragraphStack = '</p><p>';
2152                                                                 }
2153                                                         }
2154                                                 } else {
2155                                                         if ( $paragraphStack ) {
2156                                                                 $output .= $paragraphStack;
2157                                                                 $paragraphStack = false;
2158                                                                 $this->mLastSection = 'p';
2159                                                         } else if ($this->mLastSection != 'p') {
2160                                                                 $output .= $this->closeParagraph().'<p>';
2161                                                                 $this->mLastSection = 'p';
2162                                                         }
2163                                                 }
2164                                         }
2165                                 }
2166                                 wfProfileOut( __METHOD__."-paragraph" );
2167                         }
2168                         // somewhere above we forget to get out of pre block (bug 785)
2169                         if($preCloseMatch && $this->mInPre) {
2170                                 $this->mInPre = false;
2171                         }
2172                         if ($paragraphStack === false) {
2173                                 $output .= $t."\n";
2174                         }
2175                 }
2176                 while ( $prefixLength ) {
2177                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2178                         --$prefixLength;
2179                 }
2180                 if ( '' != $this->mLastSection ) {
2181                         $output .= '</' . $this->mLastSection . '>';
2182                         $this->mLastSection = '';
2183                 }
2184
2185                 wfProfileOut( __METHOD__ );
2186                 return $output;
2187         }
2188
2189         /**
2190          * Split up a string on ':', ignoring any occurences inside tags
2191          * to prevent illegal overlapping.
2192          * @param string $str the string to split
2193          * @param string &$before set to everything before the ':'
2194          * @param string &$after set to everything after the ':'
2195          * return string the position of the ':', or false if none found
2196          */
2197         function findColonNoLinks($str, &$before, &$after) {
2198                 wfProfileIn( __METHOD__ );
2199
2200                 $pos = strpos( $str, ':' );
2201                 if( $pos === false ) {
2202                         // Nothing to find!
2203                         wfProfileOut( __METHOD__ );
2204                         return false;
2205                 }
2206
2207                 $lt = strpos( $str, '<' );
2208                 if( $lt === false || $lt > $pos ) {
2209                         // Easy; no tag nesting to worry about
2210                         $before = substr( $str, 0, $pos );
2211                         $after = substr( $str, $pos+1 );
2212                         wfProfileOut( __METHOD__ );
2213                         return $pos;
2214                 }
2215
2216                 // Ugly state machine to walk through avoiding tags.
2217                 $state = self::COLON_STATE_TEXT;
2218                 $stack = 0;
2219                 $len = strlen( $str );
2220                 for( $i = 0; $i < $len; $i++ ) {
2221                         $c = $str{$i};
2222
2223                         switch( $state ) {
2224                         // (Using the number is a performance hack for common cases)
2225                         case 0: // self::COLON_STATE_TEXT:
2226                                 switch( $c ) {
2227                                 case "<":
2228                                         // Could be either a <start> tag or an </end> tag
2229                                         $state = self::COLON_STATE_TAGSTART;
2230                                         break;
2231                                 case ":":
2232                                         if( $stack == 0 ) {
2233                                                 // We found it!
2234                                                 $before = substr( $str, 0, $i );
2235                                                 $after = substr( $str, $i + 1 );
2236                                                 wfProfileOut( __METHOD__ );
2237                                                 return $i;
2238                                         }
2239                                         // Embedded in a tag; don't break it.
2240                                         break;
2241                                 default:
2242                                         // Skip ahead looking for something interesting
2243                                         $colon = strpos( $str, ':', $i );
2244                                         if( $colon === false ) {
2245                                                 // Nothing else interesting
2246                                                 wfProfileOut( __METHOD__ );
2247                                                 return false;
2248                                         }
2249                                         $lt = strpos( $str, '<', $i );
2250                                         if( $stack === 0 ) {
2251                                                 if( $lt === false || $colon < $lt ) {
2252                                                         // We found it!
2253                                                         $before = substr( $str, 0, $colon );
2254                                                         $after = substr( $str, $colon + 1 );
2255                                                         wfProfileOut( __METHOD__ );
2256                                                         return $i;
2257                                                 }
2258                                         }
2259                                         if( $lt === false ) {
2260                                                 // Nothing else interesting to find; abort!
2261                                                 // We're nested, but there's no close tags left. Abort!
2262                                                 break 2;
2263                                         }
2264                                         // Skip ahead to next tag start
2265                                         $i = $lt;
2266                                         $state = self::COLON_STATE_TAGSTART;
2267                                 }
2268                                 break;
2269                         case 1: // self::COLON_STATE_TAG:
2270                                 // In a <tag>
2271                                 switch( $c ) {
2272                                 case ">":
2273                                         $stack++;
2274                                         $state = self::COLON_STATE_TEXT;
2275                                         break;
2276                                 case "/":
2277                                         // Slash may be followed by >?
2278                                         $state = self::COLON_STATE_TAGSLASH;
2279                                         break;
2280                                 default:
2281                                         // ignore
2282                                 }
2283                                 break;
2284                         case 2: // self::COLON_STATE_TAGSTART:
2285                                 switch( $c ) {
2286                                 case "/":
2287                                         $state = self::COLON_STATE_CLOSETAG;
2288                                         break;
2289                                 case "!":
2290                                         $state = self::COLON_STATE_COMMENT;
2291                                         break;
2292                                 case ">":
2293                                         // Illegal early close? This shouldn't happen D:
2294                                         $state = self::COLON_STATE_TEXT;
2295                                         break;
2296                                 default:
2297                                         $state = self::COLON_STATE_TAG;
2298                                 }
2299                                 break;
2300                         case 3: // self::COLON_STATE_CLOSETAG:
2301                                 // In a </tag>
2302                                 if( $c == ">" ) {
2303                                         $stack--;
2304                                         if( $stack < 0 ) {
2305                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2306                                                 wfProfileOut( __METHOD__ );
2307                                                 return false;
2308                                         }
2309                                         $state = self::COLON_STATE_TEXT;
2310                                 }
2311                                 break;
2312                         case self::COLON_STATE_TAGSLASH:
2313                                 if( $c == ">" ) {
2314                                         // Yes, a self-closed tag <blah/>
2315                                         $state = self::COLON_STATE_TEXT;
2316                                 } else {
2317                                         // Probably we're jumping the gun, and this is an attribute
2318                                         $state = self::COLON_STATE_TAG;
2319                                 }
2320                                 break;
2321                         case 5: // self::COLON_STATE_COMMENT:
2322                                 if( $c == "-" ) {
2323                                         $state = self::COLON_STATE_COMMENTDASH;
2324                                 }
2325                                 break;
2326                         case self::COLON_STATE_COMMENTDASH:
2327                                 if( $c == "-" ) {
2328                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2329                                 } else {
2330                                         $state = self::COLON_STATE_COMMENT;
2331                                 }
2332                                 break;
2333                         case self::COLON_STATE_COMMENTDASHDASH:
2334                                 if( $c == ">" ) {
2335                                         $state = self::COLON_STATE_TEXT;
2336                                 } else {
2337                                         $state = self::COLON_STATE_COMMENT;
2338                                 }
2339                                 break;
2340                         default:
2341                                 throw new MWException( "State machine error in " . __METHOD__ );
2342                         }
2343                 }
2344                 if( $stack > 0 ) {
2345                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2346                         return false;
2347                 }
2348                 wfProfileOut( __METHOD__ );
2349                 return false;
2350         }
2351
2352         /**
2353          * Return value of a magic variable (like PAGENAME)
2354          *
2355          * @private
2356          */
2357         function getVariableValue( $index ) {
2358                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2359
2360                 /**
2361                  * Some of these require message or data lookups and can be
2362                  * expensive to check many times.
2363                  */
2364                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2365                         if ( isset( $this->mVarCache[$index] ) ) {
2366                                 return $this->mVarCache[$index];
2367                         }
2368                 }
2369
2370                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2371                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2372
2373                 # Use the time zone
2374                 global $wgLocaltimezone;
2375                 if ( isset( $wgLocaltimezone ) ) {
2376                         $oldtz = getenv( 'TZ' );
2377                         putenv( 'TZ='.$wgLocaltimezone );
2378                 }
2379
2380                 wfSuppressWarnings(); // E_STRICT system time bitching
2381                 $localTimestamp = date( 'YmdHis', $ts );
2382                 $localMonth = date( 'm', $ts );
2383                 $localMonthName = date( 'n', $ts );
2384                 $localDay = date( 'j', $ts );
2385                 $localDay2 = date( 'd', $ts );
2386                 $localDayOfWeek = date( 'w', $ts );
2387                 $localWeek = date( 'W', $ts );
2388                 $localYear = date( 'Y', $ts );
2389                 $localHour = date( 'H', $ts );
2390                 if ( isset( $wgLocaltimezone ) ) {
2391                         putenv( 'TZ='.$oldtz );
2392                 }
2393                 wfRestoreWarnings();
2394
2395                 switch ( $index ) {
2396                         case 'currentmonth':
2397                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2398                         case 'currentmonthname':
2399                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2400                         case 'currentmonthnamegen':
2401                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2402                         case 'currentmonthabbrev':
2403                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2404                         case 'currentday':
2405                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2406                         case 'currentday2':
2407                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2408                         case 'localmonth':
2409                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth );
2410                         case 'localmonthname':
2411                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( $localMonthName );
2412                         case 'localmonthnamegen':
2413                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2414                         case 'localmonthabbrev':
2415                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2416                         case 'localday':
2417                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay );
2418                         case 'localday2':
2419                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay2 );
2420                         case 'pagename':
2421                                 return wfEscapeWikiText( $this->mTitle->getText() );
2422                         case 'pagenamee':
2423                                 return $this->mTitle->getPartialURL();
2424                         case 'fullpagename':
2425                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2426                         case 'fullpagenamee':
2427                                 return $this->mTitle->getPrefixedURL();
2428                         case 'subpagename':
2429                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2430                         case 'subpagenamee':
2431                                 return $this->mTitle->getSubpageUrlForm();
2432                         case 'basepagename':
2433                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2434                         case 'basepagenamee':
2435                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2436                         case 'talkpagename':
2437                                 if( $this->mTitle->canTalk() ) {
2438                                         $talkPage = $this->mTitle->getTalkPage();
2439                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2440                                 } else {
2441                                         return '';
2442                                 }
2443                         case 'talkpagenamee':
2444                                 if( $this->mTitle->canTalk() ) {
2445                                         $talkPage = $this->mTitle->getTalkPage();
2446                                         return $talkPage->getPrefixedUrl();
2447                                 } else {
2448                                         return '';
2449                                 }
2450                         case 'subjectpagename':
2451                                 $subjPage = $this->mTitle->getSubjectPage();
2452                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2453                         case 'subjectpagenamee':
2454                                 $subjPage = $this->mTitle->getSubjectPage();
2455                                 return $subjPage->getPrefixedUrl();
2456                         case 'revisionid':
2457                                 // Let the edit saving system know we should parse the page
2458                                 // *after* a revision ID has been assigned.
2459                                 $this->mOutput->setFlag( 'vary-revision' );
2460                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2461                                 return $this->mRevisionId;
2462                         case 'revisionday':
2463                                 // Let the edit saving system know we should parse the page
2464                                 // *after* a revision ID has been assigned. This is for null edits.
2465                                 $this->mOutput->setFlag( 'vary-revision' );
2466                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2467                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2468                         case 'revisionday2':
2469                                 // Let the edit saving system know we should parse the page
2470                                 // *after* a revision ID has been assigned. This is for null edits.
2471                                 $this->mOutput->setFlag( 'vary-revision' );
2472                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2473                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2474                         case 'revisionmonth':
2475                                 // Let the edit saving system know we should parse the page
2476                                 // *after* a revision ID has been assigned. This is for null edits.
2477                                 $this->mOutput->setFlag( 'vary-revision' );
2478                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2479                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2480                         case 'revisionyear':
2481                                 // Let the edit saving system know we should parse the page
2482                                 // *after* a revision ID has been assigned. This is for null edits.
2483                                 $this->mOutput->setFlag( 'vary-revision' );
2484                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2485                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2486                         case 'revisiontimestamp':
2487                                 // Let the edit saving system know we should parse the page
2488                                 // *after* a revision ID has been assigned. This is for null edits.
2489                                 $this->mOutput->setFlag( 'vary-revision' );
2490                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2491                                 return $this->getRevisionTimestamp();
2492                         case 'namespace':
2493                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2494                         case 'namespacee':
2495                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2496                         case 'talkspace':
2497                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2498                         case 'talkspacee':
2499                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2500                         case 'subjectspace':
2501                                 return $this->mTitle->getSubjectNsText();
2502                         case 'subjectspacee':
2503                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2504                         case 'currentdayname':
2505                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2506                         case 'currentyear':
2507                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2508                         case 'currenttime':
2509                                 return $this->mVarCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2510                         case 'currenthour':
2511                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2512                         case 'currentweek':
2513                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2514                                 // int to remove the padding
2515                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2516                         case 'currentdow':
2517                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2518                         case 'localdayname':
2519                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2520                         case 'localyear':
2521                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localYear, true );
2522                         case 'localtime':
2523                                 return $this->mVarCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2524                         case 'localhour':
2525                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localHour, true );
2526                         case 'localweek':
2527                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2528                                 // int to remove the padding
2529                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2530                         case 'localdow':
2531                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2532                         case 'numberofarticles':
2533                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2534                         case 'numberoffiles':
2535                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2536                         case 'numberofusers':
2537                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2538                         case 'numberofpages':
2539                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2540                         case 'numberofadmins':
2541                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2542                         case 'numberofedits':
2543                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2544                         case 'currenttimestamp':
2545                                 return $this->mVarCache[$index] = wfTimestamp( TS_MW, $ts );
2546                         case 'localtimestamp':
2547                                 return $this->mVarCache[$index] = $localTimestamp;
2548                         case 'currentversion':
2549                                 return $this->mVarCache[$index] = SpecialVersion::getVersion();
2550                         case 'sitename':
2551                                 return $wgSitename;
2552                         case 'server':
2553                                 return $wgServer;
2554                         case 'servername':
2555                                 return $wgServerName;
2556                         case 'scriptpath':
2557                                 return $wgScriptPath;
2558                         case 'directionmark':
2559                                 return $wgContLang->getDirMark();
2560                         case 'contentlanguage':
2561                                 global $wgContLanguageCode;
2562                                 return $wgContLanguageCode;
2563                         default:
2564                                 $ret = null;
2565                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret ) ) )
2566                                         return $ret;
2567                                 else
2568                                         return null;
2569                 }
2570         }
2571
2572         /**
2573          * initialise the magic variables (like CURRENTMONTHNAME)
2574          *
2575          * @private
2576          */
2577         function initialiseVariables() {
2578                 wfProfileIn( __METHOD__ );
2579                 $variableIDs = MagicWord::getVariableIDs();
2580
2581                 $this->mVariables = new MagicWordArray( $variableIDs );
2582                 wfProfileOut( __METHOD__ );
2583         }
2584
2585         /**
2586          * Preprocess some wikitext and return the document tree.
2587          * This is the ghost of replace_variables().
2588          *
2589          * @param string $text The text to parse
2590          * @param integer flags Bitwise combination of:
2591          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2592          *                                     included. Default is to assume a direct page view.
2593          *
2594          * The generated DOM tree must depend only on the input text and the flags.
2595          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2596          *
2597          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2598          * change in the DOM tree for a given text, must be passed through the section identifier
2599          * in the section edit link and thus back to extractSections().
2600          *
2601          * The output of this function is currently only cached in process memory, but a persistent
2602          * cache may be implemented at a later date which takes further advantage of these strict
2603          * dependency requirements.
2604          *
2605          * @private
2606          */
2607         function preprocessToDom ( $text, $flags = 0 ) {
2608                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2609                 return $dom;
2610         }
2611
2612         /*
2613          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2614          */
2615         public static function splitWhitespace( $s ) {
2616                 $ltrimmed = ltrim( $s );
2617                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2618                 $trimmed = rtrim( $ltrimmed );
2619                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2620                 if ( $diff > 0 ) {
2621                         $w2 = substr( $ltrimmed, -$diff );
2622                 } else {
2623                         $w2 = '';
2624                 }
2625                 return array( $w1, $trimmed, $w2 );
2626         }
2627
2628         /**
2629          * Replace magic variables, templates, and template arguments
2630          * with the appropriate text. Templates are substituted recursively,
2631          * taking care to avoid infinite loops.
2632          *
2633          * Note that the substitution depends on value of $mOutputType:
2634          *  self::OT_WIKI: only {{subst:}} templates
2635          *  self::OT_PREPROCESS: templates but not extension tags
2636          *  self::OT_HTML: all templates and extension tags
2637          *
2638          * @param string $tex The text to transform
2639          * @param PPFrame $frame Object describing the arguments passed to the template.
2640          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2641          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2642          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2643          * @private
2644          */
2645         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2646                 # Prevent too big inclusions
2647                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2648                         return $text;
2649                 }
2650
2651                 wfProfileIn( __METHOD__ );
2652
2653                 if ( $frame === false ) {
2654                         $frame = $this->getPreprocessor()->newFrame();
2655                 } elseif ( !( $frame instanceof PPFrame ) ) {
2656                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2657                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2658                 }
2659
2660                 $dom = $this->preprocessToDom( $text );
2661                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2662                 $text = $frame->expand( $dom, $flags );
2663
2664                 wfProfileOut( __METHOD__ );
2665                 return $text;
2666         }
2667
2668         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2669         static function createAssocArgs( $args ) {
2670                 $assocArgs = array();
2671                 $index = 1;
2672                 foreach( $args as $arg ) {
2673                         $eqpos = strpos( $arg, '=' );
2674                         if ( $eqpos === false ) {
2675                                 $assocArgs[$index++] = $arg;
2676                         } else {
2677                                 $name = trim( substr( $arg, 0, $eqpos ) );
2678                                 $value = trim( substr( $arg, $eqpos+1 ) );
2679                                 if ( $value === false ) {
2680                                         $value = '';
2681                                 }
2682                                 if ( $name !== false ) {
2683                                         $assocArgs[$name] = $value;
2684                                 }
2685                         }
2686                 }
2687
2688                 return $assocArgs;
2689         }
2690
2691         /**
2692          * Warn the user when a parser limitation is reached
2693          * Will warn at most once the user per limitation type
2694          *
2695          * @param string $limitationType, should be one of:
2696          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2697          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2698          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2699          * @params int $current, $max When an explicit limit has been
2700          *       exceeded, provide the values (optional)
2701          */
2702         function limitationWarn( $limitationType, $current=null, $max=null) {
2703                 $msgName = $limitationType . '-warning';
2704                 //does no harm if $current and $max are present but are unnecessary for the message
2705                 $warning = wfMsgExt( $msgName, array( 'parsemag', 'escape' ), $current, $max );
2706                 $this->mOutput->addWarning( $warning );
2707                 $cat = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( $limitationType . '-category' ) );
2708                 if ( $cat ) {
2709                         $this->mOutput->addCategory( $cat->getDBkey(), $this->getDefaultSort() );
2710                 }
2711         }
2712
2713         /**
2714          * Return the text of a template, after recursively
2715          * replacing any variables or templates within the template.
2716          *
2717          * @param array $piece The parts of the template
2718          *  $piece['title']: the title, i.e. the part before the |
2719          *  $piece['parts']: the parameter array
2720          *  $piece['lineStart']: whether the brace was at the start of a line
2721          * @param PPFrame The current frame, contains template arguments
2722          * @return string the text of the template
2723          * @private
2724          */
2725         function braceSubstitution( $piece, $frame ) {
2726                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2727                 wfProfileIn( __METHOD__ );
2728                 wfProfileIn( __METHOD__.'-setup' );
2729
2730                 # Flags
2731                 $found = false;             # $text has been filled
2732                 $nowiki = false;            # wiki markup in $text should be escaped
2733                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2734                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2735                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2736                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2737
2738                 # Title object, where $text came from
2739                 $title = NULL;
2740
2741                 # $part1 is the bit before the first |, and must contain only title characters.
2742                 # Various prefixes will be stripped from it later.
2743                 $titleWithSpaces = $frame->expand( $piece['title'] );
2744                 $part1 = trim( $titleWithSpaces );
2745                 $titleText = false;
2746
2747                 # Original title text preserved for various purposes
2748                 $originalTitle = $part1;
2749
2750                 # $args is a list of argument nodes, starting from index 0, not including $part1
2751                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2752                 wfProfileOut( __METHOD__.'-setup' );
2753
2754                 # SUBST
2755                 wfProfileIn( __METHOD__.'-modifiers' );
2756                 if ( !$found ) {
2757                         $mwSubst = MagicWord::get( 'subst' );
2758                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2759                                 # One of two possibilities is true:
2760                                 # 1) Found SUBST but not in the PST phase
2761                                 # 2) Didn't find SUBST and in the PST phase
2762                                 # In either case, return without further processing
2763                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2764                                 $isLocalObj = true;
2765                                 $found = true;
2766                         }
2767                 }
2768
2769                 # Variables
2770                 if ( !$found && $args->getLength() == 0 ) {
2771                         $id = $this->mVariables->matchStartToEnd( $part1 );
2772                         if ( $id !== false ) {
2773                                 $text = $this->getVariableValue( $id );
2774                                 if (MagicWord::getCacheTTL($id)>-1)
2775                                         $this->mOutput->mContainsOldMagic = true;
2776                                 $found = true;
2777                         }
2778                 }
2779
2780                 # MSG, MSGNW and RAW
2781                 if ( !$found ) {
2782                         # Check for MSGNW:
2783                         $mwMsgnw = MagicWord::get( 'msgnw' );
2784                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2785                                 $nowiki = true;
2786                         } else {
2787                                 # Remove obsolete MSG:
2788                                 $mwMsg = MagicWord::get( 'msg' );
2789                                 $mwMsg->matchStartAndRemove( $part1 );
2790                         }
2791
2792                         # Check for RAW:
2793                         $mwRaw = MagicWord::get( 'raw' );
2794                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2795                                 $forceRawInterwiki = true;
2796                         }
2797                 }
2798                 wfProfileOut( __METHOD__.'-modifiers' );
2799
2800                 # Parser functions
2801                 if ( !$found ) {
2802                         wfProfileIn( __METHOD__ . '-pfunc' );
2803
2804                         $colonPos = strpos( $part1, ':' );
2805                         if ( $colonPos !== false ) {
2806                                 # Case sensitive functions
2807                                 $function = substr( $part1, 0, $colonPos );
2808                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2809                                         $function = $this->mFunctionSynonyms[1][$function];
2810                                 } else {
2811                                         # Case insensitive functions
2812                                         $function = strtolower( $function );
2813                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2814                                                 $function = $this->mFunctionSynonyms[0][$function];
2815                                         } else {
2816                                                 $function = false;
2817                                         }
2818                                 }
2819                                 if ( $function ) {
2820                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2821                                         $initialArgs = array( &$this );
2822                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2823                                         if ( $flags & SFH_OBJECT_ARGS ) {
2824                                                 # Add a frame parameter, and pass the arguments as an array
2825                                                 $allArgs = $initialArgs;
2826                                                 $allArgs[] = $frame;
2827                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2828                                                         $funcArgs[] = $args->item( $i );
2829                                                 }
2830                                                 $allArgs[] = $funcArgs;
2831                                         } else {
2832                                                 # Convert arguments to plain text
2833                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2834                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2835                                                 }
2836                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2837                                         }
2838
2839                                         # Workaround for PHP bug 35229 and similar
2840                                         if ( !is_callable( $callback ) ) {
2841                                                 throw new MWException( "Tag hook for $name is not callable\n" );
2842                                         }
2843                                         $result = call_user_func_array( $callback, $allArgs );
2844                                         $found = true;
2845                                         $noparse = true;
2846                                         $preprocessFlags = 0;
2847
2848                                         if ( is_array( $result ) ) {
2849                                                 if ( isset( $result[0] ) ) {
2850                                                         $text = $result[0];
2851                                                         unset( $result[0] );
2852                                                 }
2853
2854                                                 // Extract flags into the local scope
2855                                                 // This allows callers to set flags such as nowiki, found, etc.
2856                                                 extract( $result );
2857                                         } else {
2858                                                 $text = $result;
2859                                         }
2860                                         if ( !$noparse ) {
2861                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2862                                                 $isChildObj = true;
2863                                         }
2864                                 }
2865                         }
2866                         wfProfileOut( __METHOD__ . '-pfunc' );
2867                 }
2868
2869                 # Finish mangling title and then check for loops.
2870                 # Set $title to a Title object and $titleText to the PDBK
2871                 if ( !$found ) {
2872                         $ns = NS_TEMPLATE;
2873                         # Split the title into page and subpage
2874                         $subpage = '';
2875                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2876                         if ($subpage !== '') {
2877                                 $ns = $this->mTitle->getNamespace();
2878                         }
2879                         $title = Title::newFromText( $part1, $ns );
2880                         if ( $title ) {
2881                                 $titleText = $title->getPrefixedText();
2882                                 # Check for language variants if the template is not found
2883                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2884                                         $wgContLang->findVariantLink($part1, $title);
2885                                 }
2886                                 # Do infinite loop check
2887                                 if ( !$frame->loopCheck( $title ) ) {
2888                                         $found = true;
2889                                         $text = "<span class=\"error\">Template loop detected: [[$titleText]]</span>";
2890                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2891                                 }
2892                                 # Do recursion depth check
2893                                 $limit = $this->mOptions->getMaxTemplateDepth();
2894                                 if ( $frame->depth >= $limit ) {
2895                                         $found = true;
2896                                         $text = "<span class=\"error\">Template recursion depth limit exceeded ($limit)</span>";
2897                                 }
2898                         }
2899                 }
2900
2901                 # Load from database
2902                 if ( !$found && $title ) {
2903                         wfProfileIn( __METHOD__ . '-loadtpl' );
2904                         if ( !$title->isExternal() ) {
2905                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2906                                         $text = SpecialPage::capturePath( $title );
2907                                         if ( is_string( $text ) ) {
2908                                                 $found = true;
2909                                                 $isHTML = true;
2910                                                 $this->disableCache();
2911                                         }
2912                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2913                                         $found = false; //access denied
2914                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2915                                 } else {
2916                                         list( $text, $title ) = $this->getTemplateDom( $title );
2917                                         if ( $text !== false ) {
2918                                                 $found = true;
2919                                                 $isChildObj = true;
2920                                         }
2921                                 }
2922
2923                                 # If the title is valid but undisplayable, make a link to it
2924                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2925                                         $text = "[[:$titleText]]";
2926                                         $found = true;
2927                                 }
2928                         } elseif ( $title->isTrans() ) {
2929                                 // Interwiki transclusion
2930                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2931                                         $text = $this->interwikiTransclude( $title, 'render' );
2932                                         $isHTML = true;
2933                                 } else {
2934                                         $text = $this->interwikiTransclude( $title, 'raw' );
2935                                         // Preprocess it like a template
2936                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2937                                         $isChildObj = true;
2938                                 }
2939                                 $found = true;
2940                         }
2941                         wfProfileOut( __METHOD__ . '-loadtpl' );
2942                 }
2943
2944                 # If we haven't found text to substitute by now, we're done
2945                 # Recover the source wikitext and return it
2946                 if ( !$found ) {
2947                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2948                         wfProfileOut( __METHOD__ );
2949                         return array( 'object' => $text );
2950                 }
2951
2952                 # Expand DOM-style return values in a child frame
2953                 if ( $isChildObj ) {
2954                         # Clean up argument array
2955                         $newFrame = $frame->newChild( $args, $title );
2956
2957                         if ( $nowiki ) {
2958                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
2959                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
2960                                 # Expansion is eligible for the empty-frame cache
2961                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
2962                                         $text = $this->mTplExpandCache[$titleText];
2963                                 } else {
2964                                         $text = $newFrame->expand( $text );
2965                                         $this->mTplExpandCache[$titleText] = $text;
2966                                 }
2967                         } else {
2968                                 # Uncached expansion
2969                                 $text = $newFrame->expand( $text );
2970                         }
2971                 }
2972                 if ( $isLocalObj && $nowiki ) {
2973                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
2974                         $isLocalObj = false;
2975                 }
2976
2977                 # Replace raw HTML by a placeholder
2978                 # Add a blank line preceding, to prevent it from mucking up
2979                 # immediately preceding headings
2980                 if ( $isHTML ) {
2981                         $text = "\n\n" . $this->insertStripItem( $text );
2982                 }
2983                 # Escape nowiki-style return values
2984                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2985                         $text = wfEscapeWikiText( $text );
2986                 }
2987                 # Bug 529: if the template begins with a table or block-level
2988                 # element, it should be treated as beginning a new line.
2989                 # This behaviour is somewhat controversial.
2990                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
2991                         $text = "\n" . $text;
2992                 }
2993
2994                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
2995                         # Error, oversize inclusion
2996                         $text = "[[$originalTitle]]" .
2997                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
2998                         $this->limitationWarn( 'post-expand-template-inclusion' );
2999                 }
3000
3001                 if ( $isLocalObj ) {
3002                         $ret = array( 'object' => $text );
3003                 } else {
3004                         $ret = array( 'text' => $text );
3005                 }
3006
3007                 wfProfileOut( __METHOD__ );
3008                 return $ret;
3009         }
3010
3011         /**
3012          * Get the semi-parsed DOM representation of a template with a given title,
3013          * and its redirect destination title. Cached.
3014          */
3015         function getTemplateDom( $title ) {
3016                 $cacheTitle = $title;
3017                 $titleText = $title->getPrefixedDBkey();
3018
3019                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3020                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3021                         $title = Title::makeTitle( $ns, $dbk );
3022                         $titleText = $title->getPrefixedDBkey();
3023                 }
3024                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3025                         return array( $this->mTplDomCache[$titleText], $title );
3026                 }
3027
3028                 // Cache miss, go to the database
3029                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3030
3031                 if ( $text === false ) {
3032                         $this->mTplDomCache[$titleText] = false;
3033                         return array( false, $title );
3034                 }
3035
3036                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3037                 $this->mTplDomCache[ $titleText ] = $dom;
3038
3039                 if (! $title->equals($cacheTitle)) {
3040                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3041                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3042                 }
3043
3044                 return array( $dom, $title );
3045         }
3046
3047         /**
3048          * Fetch the unparsed text of a template and register a reference to it.
3049          */
3050         function fetchTemplateAndTitle( $title ) {
3051                 $templateCb = $this->mOptions->getTemplateCallback();
3052                 $stuff = call_user_func( $templateCb, $title, $this );
3053                 $text = $stuff['text'];
3054                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3055                 if ( isset( $stuff['deps'] ) ) {
3056                         foreach ( $stuff['deps'] as $dep ) {
3057                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3058                         }
3059                 }
3060                 return array($text,$finalTitle);
3061         }
3062
3063         function fetchTemplate( $title ) {
3064                 $rv = $this->fetchTemplateAndTitle($title);
3065                 return $rv[0];
3066         }
3067
3068         /**
3069          * Static function to get a template
3070          * Can be overridden via ParserOptions::setTemplateCallback().
3071          */
3072         static function statelessFetchTemplate( $title, $parser=false ) {
3073                 $text = $skip = false;
3074                 $finalTitle = $title;
3075                 $deps = array();
3076
3077                 // Loop to fetch the article, with up to 1 redirect
3078                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3079                         # Give extensions a chance to select the revision instead
3080                         $id = false; // Assume current
3081                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3082
3083                         if( $skip ) {
3084                                 $text = false;
3085                                 $deps[] = array(
3086                                         'title' => $title,
3087                                         'page_id' => $title->getArticleID(),
3088                                         'rev_id' => null );
3089                                 break;
3090                         }
3091                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3092                         $rev_id = $rev ? $rev->getId() : 0;
3093                         // If there is no current revision, there is no page
3094                         if( $id === false && !$rev ) {
3095                                 $linkCache = LinkCache::singleton();
3096                                 $linkCache->addBadLinkObj( $title );
3097                         }
3098
3099                         $deps[] = array(
3100                                 'title' => $title,
3101                                 'page_id' => $title->getArticleID(),
3102                                 'rev_id' => $rev_id );
3103
3104                         if( $rev ) {
3105                                 $text = $rev->getText();
3106                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3107                                 global $wgLang;
3108                                 $message = $wgLang->lcfirst( $title->getText() );
3109                                 $text = wfMsgForContentNoTrans( $message );
3110                                 if( wfEmptyMsg( $message, $text ) ) {
3111                                         $text = false;
3112                                         break;
3113                                 }
3114                         } else {
3115                                 break;
3116                         }
3117                         if ( $text === false ) {
3118                                 break;
3119                         }
3120                         // Redirect?
3121                         $finalTitle = $title;
3122                         $title = Title::newFromRedirect( $text );
3123                 }
3124                 return array(
3125                         'text' => $text,
3126                         'finalTitle' => $finalTitle,
3127                         'deps' => $deps );
3128         }
3129
3130         /**
3131          * Transclude an interwiki link.
3132          */
3133         function interwikiTransclude( $title, $action ) {
3134                 global $wgEnableScaryTranscluding;
3135
3136                 if (!$wgEnableScaryTranscluding)
3137                         return wfMsg('scarytranscludedisabled');
3138
3139                 $url = $title->getFullUrl( "action=$action" );
3140
3141                 if (strlen($url) > 255)
3142                         return wfMsg('scarytranscludetoolong');
3143                 return $this->fetchScaryTemplateMaybeFromCache($url);
3144         }
3145
3146         function fetchScaryTemplateMaybeFromCache($url) {
3147                 global $wgTranscludeCacheExpiry;
3148                 $dbr = wfGetDB(DB_SLAVE);
3149                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3150                                 array('tc_url' => $url));
3151                 if ($obj) {
3152                         $time = $obj->tc_time;
3153                         $text = $obj->tc_contents;
3154                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3155                                 return $text;
3156                         }
3157                 }
3158
3159                 $text = Http::get($url);
3160                 if (!$text)
3161                         return wfMsg('scarytranscludefailed', $url);
3162
3163                 $dbw = wfGetDB(DB_MASTER);
3164                 $dbw->replace('transcache', array('tc_url'), array(
3165                         'tc_url' => $url,
3166                         'tc_time' => time(),
3167                         'tc_contents' => $text));
3168                 return $text;
3169         }
3170
3171
3172         /**
3173          * Triple brace replacement -- used for template arguments
3174          * @private
3175          */
3176         function argSubstitution( $piece, $frame ) {
3177                 wfProfileIn( __METHOD__ );
3178
3179                 $error = false;
3180                 $parts = $piece['parts'];
3181                 $nameWithSpaces = $frame->expand( $piece['title'] );
3182                 $argName = trim( $nameWithSpaces );
3183                 $object = false;
3184                 $text = $frame->getArgument( $argName );
3185                 if (  $text === false && $parts->getLength() > 0
3186                   && (
3187                     $this->ot['html']
3188                     || $this->ot['pre']
3189                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3190                   )
3191                 ) {
3192                         # No match in frame, use the supplied default
3193                         $object = $parts->item( 0 )->getChildren();
3194                 }
3195                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3196                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3197                         $this->limitationWarn( 'post-expand-template-argument' );
3198                 }
3199
3200                 if ( $text === false && $object === false ) {
3201                         # No match anywhere
3202                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3203                 }
3204                 if ( $error !== false ) {
3205                         $text .= $error;
3206                 }
3207                 if ( $object !== false ) {
3208                         $ret = array( 'object' => $object );
3209                 } else {
3210                         $ret = array( 'text' => $text );
3211                 }
3212
3213                 wfProfileOut( __METHOD__ );
3214                 return $ret;
3215         }
3216
3217         /**
3218          * Return the text to be used for a given extension tag.
3219          * This is the ghost of strip().
3220          *
3221          * @param array $params Associative array of parameters:
3222          *     name       PPNode for the tag name
3223          *     attr       PPNode for unparsed text where tag attributes are thought to be
3224          *     attributes Optional associative array of parsed attributes
3225          *     inner      Contents of extension element
3226          *     noClose    Original text did not have a close tag
3227          * @param PPFrame $frame
3228          */
3229         function extensionSubstitution( $params, $frame ) {
3230                 global $wgRawHtml, $wgContLang;
3231
3232                 $name = $frame->expand( $params['name'] );
3233                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3234                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3235
3236                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3237
3238                 if ( $this->ot['html'] ) {
3239                         $name = strtolower( $name );
3240
3241                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3242                         if ( isset( $params['attributes'] ) ) {
3243                                 $attributes = $attributes + $params['attributes'];
3244                         }
3245                         switch ( $name ) {
3246                                 case 'html':
3247                                         if( $wgRawHtml ) {
3248                                                 $output = $content;
3249                                                 break;
3250                                         } else {
3251                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3252                                         }
3253                                 case 'nowiki':
3254                                         $output = Xml::escapeTagsOnly( $content );
3255                                         break;
3256                                 case 'math':
3257                                         $output = $wgContLang->armourMath(
3258                                                 MathRenderer::renderMath( $content, $attributes ) );
3259                                         break;
3260                                 case 'gallery':
3261                                         $output = $this->renderImageGallery( $content, $attributes );
3262                                         break;
3263                                 default:
3264                                         if( isset( $this->mTagHooks[$name] ) ) {
3265                                                 # Workaround for PHP bug 35229 and similar
3266                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3267                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3268                                                 }
3269                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3270                                                         array( $content, $attributes, $this ) );
3271                                         } else {
3272                                                 $output = '<span class="error">Invalid tag extension name: ' .
3273                                                         htmlspecialchars( $name ) . '</span>';
3274                                         }
3275                         }
3276                 } else {
3277                         if ( is_null( $attrText ) ) {
3278                                 $attrText = '';
3279                         }
3280                         if ( isset( $params['attributes'] ) ) {
3281                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3282                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3283                                                 htmlspecialchars( $attrValue ) . '"';
3284                                 }
3285                         }
3286                         if ( $content === null ) {
3287                                 $output = "<$name$attrText/>";
3288                         } else {
3289                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3290                                 $output = "<$name$attrText>$content$close";
3291                         }
3292                 }
3293
3294                 if ( $name == 'html' || $name == 'nowiki' ) {
3295                         $this->mStripState->nowiki->setPair( $marker, $output );
3296                 } else {
3297                         $this->mStripState->general->setPair( $marker, $output );
3298                 }
3299                 return $marker;
3300         }
3301
3302         /**
3303          * Increment an include size counter
3304          *
3305          * @param string $type The type of expansion
3306          * @param integer $size The size of the text
3307          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3308          */
3309         function incrementIncludeSize( $type, $size ) {
3310                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3311                         return false;
3312                 } else {
3313                         $this->mIncludeSizes[$type] += $size;
3314                         return true;
3315                 }
3316         }
3317
3318         /**
3319          * Increment the expensive function count
3320          *
3321          * @return boolean False if the limit has been exceeded
3322          */
3323         function incrementExpensiveFunctionCount() {
3324                 global $wgExpensiveParserFunctionLimit;
3325                 $this->mExpensiveFunctionCount++;
3326                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3327                         return true;
3328                 }
3329                 return false;
3330         }
3331
3332         /**
3333          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3334          * Fills $this->mDoubleUnderscores, returns the modified text
3335          */
3336         function doDoubleUnderscore( $text ) {
3337                 // The position of __TOC__ needs to be recorded
3338                 $mw = MagicWord::get( 'toc' );
3339                 if( $mw->match( $text ) ) {
3340                         $this->mShowToc = true;
3341                         $this->mForceTocPosition = true;
3342
3343                         // Set a placeholder. At the end we'll fill it in with the TOC.
3344                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3345
3346                         // Only keep the first one.
3347                         $text = $mw->replace( '', $text );
3348                 }
3349
3350                 // Now match and remove the rest of them
3351                 $mwa = MagicWord::getDoubleUnderscoreArray();
3352                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3353
3354                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3355                         $this->mOutput->mNoGallery = true;
3356                 }
3357                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3358                         $this->mShowToc = false;
3359                 }
3360                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3361                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3362
3363                         $containerCategory = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( 'hidden-category-category' ) );
3364                         if ( $containerCategory ) {
3365                                 $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3366                         } else {
3367                                 wfDebug( __METHOD__.": [[MediaWiki:hidden-category-category]] is not a valid title!\n" );
3368                         }
3369                 }
3370                 # (bug 8068) Allow control over whether robots index a page.
3371                 #
3372                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3373                 # is not desirable, the last one on the page should win.
3374                 if( isset( $this->mDoubleUnderscores['noindex'] ) ) {
3375                         $this->mOutput->setIndexPolicy( 'noindex' );
3376                 } elseif( isset( $this->mDoubleUnderscores['index'] ) ) {
3377                         $this->mOutput->setIndexPolicy( 'index' );
3378                 }
3379
3380                 return $text;
3381         }
3382
3383         /**
3384          * This function accomplishes several tasks:
3385          * 1) Auto-number headings if that option is enabled
3386          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3387          * 3) Add a Table of contents on the top for users who have enabled the option
3388          * 4) Auto-anchor headings
3389          *
3390          * It loops through all headlines, collects the necessary data, then splits up the
3391          * string and re-inserts the newly formatted headlines.
3392          *
3393          * @param string $text
3394          * @param boolean $isMain
3395          * @private
3396          */
3397         function formatHeadings( $text, $isMain=true ) {
3398                 global $wgMaxTocLevel, $wgContLang;
3399
3400                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3401                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3402                         $showEditLink = 0;
3403                 } else {
3404                         $showEditLink = $this->mOptions->getEditSection();
3405                 }
3406
3407                 # Inhibit editsection links if requested in the page
3408                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
3409                         $showEditLink = 0;
3410                 }
3411
3412                 # Get all headlines for numbering them and adding funky stuff like [edit]
3413                 # links - this is for later, but we need the number of headlines right now
3414                 $matches = array();
3415                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3416
3417                 # if there are fewer than 4 headlines in the article, do not show TOC
3418                 # unless it's been explicitly enabled.
3419                 $enoughToc = $this->mShowToc &&
3420                         (($numMatches >= 4) || $this->mForceTocPosition);
3421
3422                 # Allow user to stipulate that a page should have a "new section"
3423                 # link added via __NEWSECTIONLINK__
3424                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3425                         $this->mOutput->setNewSection( true );
3426                 }
3427
3428                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3429                 # override above conditions and always show TOC above first header
3430                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3431                         $this->mShowToc = true;
3432                         $enoughToc = true;
3433                 }
3434
3435                 # We need this to perform operations on the HTML
3436                 $sk = $this->mOptions->getSkin();
3437
3438                 # headline counter
3439                 $headlineCount = 0;
3440                 $numVisible = 0;
3441
3442                 # Ugh .. the TOC should have neat indentation levels which can be
3443                 # passed to the skin functions. These are determined here
3444                 $toc = '';
3445                 $full = '';
3446                 $head = array();
3447                 $sublevelCount = array();
3448                 $levelCount = array();
3449                 $toclevel = 0;
3450                 $level = 0;
3451                 $prevlevel = 0;
3452                 $toclevel = 0;
3453                 $prevtoclevel = 0;
3454                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3455                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3456                 $tocraw = array();
3457
3458                 foreach( $matches[3] as $headline ) {
3459                         $isTemplate = false;
3460                         $titleText = false;
3461                         $sectionIndex = false;
3462                         $numbering = '';
3463                         $markerMatches = array();
3464                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3465                                 $serial = $markerMatches[1];
3466                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3467                                 $isTemplate = ($titleText != $baseTitleText);
3468                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3469                         }
3470
3471                         if( $toclevel ) {
3472                                 $prevlevel = $level;
3473                                 $prevtoclevel = $toclevel;
3474                         }
3475                         $level = $matches[1][$headlineCount];
3476
3477                         if( $doNumberHeadings || $enoughToc ) {
3478
3479                                 if ( $level > $prevlevel ) {
3480                                         # Increase TOC level
3481                                         $toclevel++;
3482                                         $sublevelCount[$toclevel] = 0;
3483                                         if( $toclevel<$wgMaxTocLevel ) {
3484                                                 $prevtoclevel = $toclevel;
3485                                                 $toc .= $sk->tocIndent();
3486                                                 $numVisible++;
3487                                         }
3488                                 }
3489                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3490                                         # Decrease TOC level, find level to jump to
3491
3492                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3493                                                 # Can only go down to level 1
3494                                                 $toclevel = 1;
3495                                         } else {
3496                                                 for ($i = $toclevel; $i > 0; $i--) {
3497                                                         if ( $levelCount[$i] == $level ) {
3498                                                                 # Found last matching level
3499                                                                 $toclevel = $i;
3500                                                                 break;
3501                                                         }
3502                                                         elseif ( $levelCount[$i] < $level ) {
3503                                                                 # Found first matching level below current level
3504                                                                 $toclevel = $i + 1;
3505                                                                 break;
3506                                                         }
3507                                                 }
3508                                         }
3509                                         if( $toclevel<$wgMaxTocLevel ) {
3510                                                 if($prevtoclevel < $wgMaxTocLevel) {
3511                                                         # Unindent only if the previous toc level was shown :p
3512                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3513                                                         $prevtoclevel = $toclevel;
3514                                                 } else {
3515                                                         $toc .= $sk->tocLineEnd();
3516                                                 }
3517                                         }
3518                                 }
3519                                 else {
3520                                         # No change in level, end TOC line
3521                                         if( $toclevel<$wgMaxTocLevel ) {
3522                                                 $toc .= $sk->tocLineEnd();
3523                                         }
3524                                 }
3525
3526                                 $levelCount[$toclevel] = $level;
3527
3528                                 # count number of headlines for each level
3529                                 @$sublevelCount[$toclevel]++;
3530                                 $dot = 0;
3531                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3532                                         if( !empty( $sublevelCount[$i] ) ) {
3533                                                 if( $dot ) {
3534                                                         $numbering .= '.';
3535                                                 }
3536                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3537                                                 $dot = 1;
3538                                         }
3539                                 }
3540                         }
3541
3542                         # The safe header is a version of the header text safe to use for links
3543                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3544                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3545
3546                         # Remove link placeholders by the link text.
3547                         #     <!--LINK number-->
3548                         # turns into
3549                         #     link text with suffix
3550                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3551
3552                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3553                         $tocline = preg_replace(
3554                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3555                                 array( '',                          '<$1>'),
3556                                 $safeHeadline
3557                         );
3558                         $tocline = trim( $tocline );
3559
3560                         # For the anchor, strip out HTML-y stuff period
3561                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3562                         $safeHeadline = trim( $safeHeadline );
3563
3564                         # Save headline for section edit hint before it's escaped
3565                         $headlineHint = $safeHeadline;
3566                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3567                         # HTML names must be case-insensitively unique (bug 10721)
3568                         $arrayKey = strtolower( $safeHeadline );
3569
3570                         # count how many in assoc. array so we can track dupes in anchors
3571                         isset( $refers[$arrayKey] ) ? $refers[$arrayKey]++ : $refers[$arrayKey] = 1;
3572                         $refcount[$headlineCount] = $refers[$arrayKey];
3573
3574                         # Don't number the heading if it is the only one (looks silly)
3575                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3576                                 # the two are different if the line contains a link
3577                                 $headline=$numbering . ' ' . $headline;
3578                         }
3579
3580                         # Create the anchor for linking from the TOC to the section
3581                         $anchor = $safeHeadline;
3582                         if($refcount[$headlineCount] > 1 ) {
3583                                 $anchor .= '_' . $refcount[$headlineCount];
3584                         }
3585                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3586                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3587                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3588                         }
3589                         # give headline the correct <h#> tag
3590                         if( $showEditLink && $sectionIndex !== false ) {
3591                                 if( $isTemplate ) {
3592                                         # Put a T flag in the section identifier, to indicate to extractSections()
3593                                         # that sections inside <includeonly> should be counted.
3594                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3595                                 } else {
3596                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3597                                 }
3598                         } else {
3599                                 $editlink = '';
3600                         }
3601                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3602
3603                         $headlineCount++;
3604                 }
3605
3606                 $this->mOutput->setSections( $tocraw );
3607
3608                 # Never ever show TOC if no headers
3609                 if( $numVisible < 1 ) {
3610                         $enoughToc = false;
3611                 }
3612
3613                 if( $enoughToc ) {
3614                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3615                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3616                         }
3617                         $toc = $sk->tocList( $toc );
3618                 }
3619
3620                 # split up and insert constructed headlines
3621
3622                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3623                 $i = 0;
3624
3625                 foreach( $blocks as $block ) {
3626                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3627                                 # This is the [edit] link that appears for the top block of text when
3628                                 # section editing is enabled
3629
3630                                 # Disabled because it broke block formatting
3631                                 # For example, a bullet point in the top line
3632                                 # $full .= $sk->editSectionLink(0);
3633                         }
3634                         $full .= $block;
3635                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3636                                 # Top anchor now in skin
3637                                 $full = $full.$toc;
3638                         }
3639
3640                         if( !empty( $head[$i] ) ) {
3641                                 $full .= $head[$i];
3642                         }
3643                         $i++;
3644                 }
3645                 if( $this->mForceTocPosition ) {
3646                         return str_replace( '<!--MWTOC-->', $toc, $full );
3647                 } else {
3648                         return $full;
3649                 }
3650         }
3651
3652         /**
3653          * Transform wiki markup when saving a page by doing \r\n -> \n
3654          * conversion, substitting signatures, {{subst:}} templates, etc.
3655          *
3656          * @param string $text the text to transform
3657          * @param Title &$title the Title object for the current article
3658          * @param User &$user the User object describing the current user
3659          * @param ParserOptions $options parsing options
3660          * @param bool $clearState whether to clear the parser state first
3661          * @return string the altered wiki markup
3662          * @public
3663          */
3664         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3665                 $this->mOptions = $options;
3666                 $this->setTitle( $title );
3667                 $this->setOutputType( self::OT_WIKI );
3668
3669                 if ( $clearState ) {
3670                         $this->clearState();
3671                 }
3672
3673                 $pairs = array(
3674                         "\r\n" => "\n",
3675                 );
3676                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3677                 $text = $this->pstPass2( $text, $user );
3678                 $text = $this->mStripState->unstripBoth( $text );
3679                 return $text;
3680         }
3681
3682         /**
3683          * Pre-save transform helper function
3684          * @private
3685          */
3686         function pstPass2( $text, $user ) {
3687                 global $wgContLang, $wgLocaltimezone;
3688
3689                 /* Note: This is the timestamp saved as hardcoded wikitext to
3690                  * the database, we use $wgContLang here in order to give
3691                  * everyone the same signature and use the default one rather
3692                  * than the one selected in each user's preferences.
3693                  *
3694                  * (see also bug 12815)
3695                  */
3696                 $ts = $this->mOptions->getTimestamp();
3697                 $tz = wfMsgForContent( 'timezone-utc' );
3698                 if ( isset( $wgLocaltimezone ) ) {
3699                         $unixts = wfTimestamp( TS_UNIX, $ts );
3700                         $oldtz = getenv( 'TZ' );
3701                         putenv( 'TZ='.$wgLocaltimezone );
3702                         $ts = date( 'YmdHis', $unixts );
3703                         $tz = date( 'T', $unixts );  # might vary on DST changeover!
3704                         putenv( 'TZ='.$oldtz );
3705                 }
3706
3707                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tz)";
3708
3709                 # Variable replacement
3710                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3711                 $text = $this->replaceVariables( $text );
3712
3713                 # Signatures
3714                 $sigText = $this->getUserSig( $user );
3715                 $text = strtr( $text, array(
3716                         '~~~~~' => $d,
3717                         '~~~~' => "$sigText $d",
3718                         '~~~' => $sigText
3719                 ) );
3720
3721                 # Context links: [[|name]] and [[name (context)|]]
3722                 #
3723                 global $wgLegalTitleChars;
3724                 $tc = "[$wgLegalTitleChars]";
3725                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3726
3727                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3728                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3729                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3730
3731                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3732                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3733                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3734
3735                 $t = $this->mTitle->getText();
3736                 $m = array();
3737                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3738                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3739                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3740                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3741                 } else {
3742                         # if there's no context, don't bother duplicating the title
3743                         $text = preg_replace( $p2, '[[\\1]]', $text );
3744                 }
3745
3746                 # Trim trailing whitespace
3747                 $text = rtrim( $text );
3748
3749                 return $text;
3750         }
3751
3752         /**
3753          * Fetch the user's signature text, if any, and normalize to
3754          * validated, ready-to-insert wikitext.
3755          *
3756          * @param User $user
3757          * @return string
3758          * @private
3759          */
3760         function getUserSig( &$user ) {
3761                 global $wgMaxSigChars;
3762
3763                 $username = $user->getName();
3764                 $nickname = $user->getOption( 'nickname' );
3765                 $nickname = $nickname === '' ? $username : $nickname;
3766
3767                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3768                         $nickname = $username;
3769                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3770                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3771                         # Sig. might contain markup; validate this
3772                         if( $this->validateSig( $nickname ) !== false ) {
3773                                 # Validated; clean up (if needed) and return it
3774                                 return $this->cleanSig( $nickname, true );
3775                         } else {
3776                                 # Failed to validate; fall back to the default
3777                                 $nickname = $username;
3778                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
3779                         }
3780                 }
3781
3782                 // Make sure nickname doesnt get a sig in a sig
3783                 $nickname = $this->cleanSigInSig( $nickname );
3784
3785                 # If we're still here, make it a link to the user page
3786                 $userText = wfEscapeWikiText( $username );
3787                 $nickText = wfEscapeWikiText( $nickname );
3788                 if ( $user->isAnon() )  {
3789                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3790                 } else {
3791                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3792                 }
3793         }
3794
3795         /**
3796          * Check that the user's signature contains no bad XML
3797          *
3798          * @param string $text
3799          * @return mixed An expanded string, or false if invalid.
3800          */
3801         function validateSig( $text ) {
3802                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3803         }
3804
3805         /**
3806          * Clean up signature text
3807          *
3808          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3809          * 2) Substitute all transclusions
3810          *
3811          * @param string $text
3812          * @param $parsing Whether we're cleaning (preferences save) or parsing
3813          * @return string Signature text
3814          */
3815         function cleanSig( $text, $parsing = false ) {
3816                 if ( !$parsing ) {
3817                         global $wgTitle;
3818                         $this->clearState();
3819                         $this->setTitle( $wgTitle );
3820                         $this->mOptions = new ParserOptions;
3821                         $this->setOutputType = self::OT_PREPROCESS;
3822                 }
3823
3824                 # Option to disable this feature
3825                 if ( !$this->mOptions->getCleanSignatures() ) {
3826                         return $text;
3827                 }
3828
3829                 # FIXME: regex doesn't respect extension tags or nowiki
3830                 #  => Move this logic to braceSubstitution()
3831                 $substWord = MagicWord::get( 'subst' );
3832                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3833                 $substText = '{{' . $substWord->getSynonym( 0 );
3834
3835                 $text = preg_replace( $substRegex, $substText, $text );
3836                 $text = $this->cleanSigInSig( $text );
3837                 $dom = $this->preprocessToDom( $text );
3838                 $frame = $this->getPreprocessor()->newFrame();
3839                 $text = $frame->expand( $dom );
3840
3841                 if ( !$parsing ) {
3842                         $text = $this->mStripState->unstripBoth( $text );
3843                 }
3844
3845                 return $text;
3846         }
3847
3848         /**
3849          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3850          * @param string $text
3851          * @return string Signature text with /~{3,5}/ removed
3852          */
3853         function cleanSigInSig( $text ) {
3854                 $text = preg_replace( '/~{3,5}/', '', $text );
3855                 return $text;
3856         }
3857
3858         /**
3859          * Set up some variables which are usually set up in parse()
3860          * so that an external function can call some class members with confidence
3861          * @public
3862          */
3863         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3864                 $this->setTitle( $title );
3865                 $this->mOptions = $options;
3866                 $this->setOutputType( $outputType );
3867                 if ( $clearState ) {
3868                         $this->clearState();
3869                 }
3870         }
3871
3872         /**
3873          * Wrapper for preprocess()
3874          *
3875          * @param string $text the text to preprocess
3876          * @param ParserOptions $options  options
3877          * @return string
3878          * @public
3879          */
3880         function transformMsg( $text, $options ) {
3881                 global $wgTitle;
3882                 static $executing = false;
3883
3884                 # Guard against infinite recursion
3885                 if ( $executing ) {
3886                         return $text;
3887                 }
3888                 $executing = true;
3889
3890                 wfProfileIn(__METHOD__);
3891                 $text = $this->preprocess( $text, $wgTitle, $options );
3892
3893                 $executing = false;
3894                 wfProfileOut(__METHOD__);
3895                 return $text;
3896         }
3897
3898         /**
3899          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3900          * The callback should have the following form:
3901          *    function myParserHook( $text, $params, &$parser ) { ... }
3902          *
3903          * Transform and return $text. Use $parser for any required context, e.g. use
3904          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3905          *
3906          * @public
3907          *
3908          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3909          * @param mixed $callback The callback function (and object) to use for the tag
3910          *
3911          * @return The old value of the mTagHooks array associated with the hook
3912          */
3913         function setHook( $tag, $callback ) {
3914                 $tag = strtolower( $tag );
3915                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3916                 $this->mTagHooks[$tag] = $callback;
3917                 if( !in_array( $tag, $this->mStripList ) ) {
3918                         $this->mStripList[] = $tag;
3919                 }
3920
3921                 return $oldVal;
3922         }
3923
3924         function setTransparentTagHook( $tag, $callback ) {
3925                 $tag = strtolower( $tag );
3926                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
3927                 $this->mTransparentTagHooks[$tag] = $callback;
3928
3929                 return $oldVal;
3930         }
3931
3932         /**
3933          * Remove all tag hooks
3934          */
3935         function clearTagHooks() {
3936                 $this->mTagHooks = array();
3937                 $this->mStripList = $this->mDefaultStripList;
3938         }
3939
3940         /**
3941          * Create a function, e.g. {{sum:1|2|3}}
3942          * The callback function should have the form:
3943          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3944          *
3945          * Or with SFH_OBJECT_ARGS:
3946          *    function myParserFunction( $parser, $frame, $args ) { ... }
3947          *
3948          * The callback may either return the text result of the function, or an array with the text
3949          * in element 0, and a number of flags in the other elements. The names of the flags are
3950          * specified in the keys. Valid flags are:
3951          *   found                     The text returned is valid, stop processing the template. This
3952          *                             is on by default.
3953          *   nowiki                    Wiki markup in the return value should be escaped
3954          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3955          *
3956          * @public
3957          *
3958          * @param string $id The magic word ID
3959          * @param mixed $callback The callback function (and object) to use
3960          * @param integer $flags a combination of the following flags:
3961          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3962          *
3963          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
3964          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
3965          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
3966          *     the arguments, and to control the way they are expanded.
3967          *
3968          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
3969          *     arguments, for instance:
3970          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
3971          *
3972          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
3973          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
3974          *     working if/when this is changed.
3975          *
3976          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
3977          *     expansion.
3978          *
3979          *     Please read the documentation in includes/parser/Preprocessor.php for more information
3980          *     about the methods available in PPFrame and PPNode.
3981          *
3982          * @return The old callback function for this name, if any
3983          */
3984         function setFunctionHook( $id, $callback, $flags = 0 ) {
3985                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
3986                 $this->mFunctionHooks[$id] = array( $callback, $flags );
3987
3988                 # Add to function cache
3989                 $mw = MagicWord::get( $id );
3990                 if( !$mw )
3991                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
3992
3993                 $synonyms = $mw->getSynonyms();
3994                 $sensitive = intval( $mw->isCaseSensitive() );
3995
3996                 foreach ( $synonyms as $syn ) {
3997                         # Case
3998                         if ( !$sensitive ) {
3999                                 $syn = strtolower( $syn );
4000                         }
4001                         # Add leading hash
4002                         if ( !( $flags & SFH_NO_HASH ) ) {
4003                                 $syn = '#' . $syn;
4004                         }
4005                         # Remove trailing colon
4006                         if ( substr( $syn, -1, 1 ) == ':' ) {
4007                                 $syn = substr( $syn, 0, -1 );
4008                         }
4009                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4010                 }
4011                 return $oldVal;
4012         }
4013
4014         /**
4015          * Get all registered function hook identifiers
4016          *
4017          * @return array
4018          */
4019         function getFunctionHooks() {
4020                 return array_keys( $this->mFunctionHooks );
4021         }
4022
4023         /**
4024          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4025          * Placeholders created in Skin::makeLinkObj()
4026          * Returns an array of link CSS classes, indexed by PDBK.
4027          */
4028         function replaceLinkHolders( &$text, $options = 0 ) {
4029                 return $this->mLinkHolders->replace( $text );
4030         }
4031
4032         /**
4033          * Replace <!--LINK--> link placeholders with plain text of links
4034          * (not HTML-formatted).
4035          * @param string $text
4036          * @return string
4037          */
4038         function replaceLinkHoldersText( $text ) {
4039                 return $this->mLinkHolders->replaceText( $text );
4040         }
4041
4042         /**
4043          * Tag hook handler for 'pre'.
4044          */
4045         function renderPreTag( $text, $attribs ) {
4046                 // Backwards-compatibility hack
4047                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4048
4049                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4050                 return wfOpenElement( 'pre', $attribs ) .
4051                         Xml::escapeTagsOnly( $content ) .
4052                         '</pre>';
4053         }
4054
4055         /**
4056          * Renders an image gallery from a text with one line per image.
4057          * text labels may be given by using |-style alternative text. E.g.
4058          *   Image:one.jpg|The number "1"
4059          *   Image:tree.jpg|A tree
4060          * given as text will return the HTML of a gallery with two images,
4061          * labeled 'The number "1"' and
4062          * 'A tree'.
4063          */
4064         function renderImageGallery( $text, $params ) {
4065                 $ig = new ImageGallery();
4066                 $ig->setContextTitle( $this->mTitle );
4067                 $ig->setShowBytes( false );
4068                 $ig->setShowFilename( false );
4069                 $ig->setParser( $this );
4070                 $ig->setHideBadImages();
4071                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4072                 $ig->useSkin( $this->mOptions->getSkin() );
4073                 $ig->mRevisionId = $this->mRevisionId;
4074
4075                 if( isset( $params['caption'] ) ) {
4076                         $caption = $params['caption'];
4077                         $caption = htmlspecialchars( $caption );
4078                         $caption = $this->replaceInternalLinks( $caption );
4079                         $ig->setCaptionHtml( $caption );
4080                 }
4081                 if( isset( $params['perrow'] ) ) {
4082                         $ig->setPerRow( $params['perrow'] );
4083                 }
4084                 if( isset( $params['widths'] ) ) {
4085                         $ig->setWidths( $params['widths'] );
4086                 }
4087                 if( isset( $params['heights'] ) ) {
4088                         $ig->setHeights( $params['heights'] );
4089                 }
4090
4091                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4092
4093                 $lines = StringUtils::explode( "\n", $text );
4094                 foreach ( $lines as $line ) {
4095                         # match lines like these:
4096                         # Image:someimage.jpg|This is some image
4097                         $matches = array();
4098                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4099                         # Skip empty lines
4100                         if ( count( $matches ) == 0 ) {
4101                                 continue;
4102                         }
4103
4104                         if ( strpos( $matches[0], '%' ) !== false )
4105                                 $matches[1] = urldecode( $matches[1] );
4106                         $tp = Title::newFromText( $matches[1], NS_IMAGE );
4107                         $nt =& $tp;
4108                         if( is_null( $nt ) ) {
4109                                 # Bogus title. Ignore these so we don't bomb out later.
4110                                 continue;
4111                         }
4112                         if ( isset( $matches[3] ) ) {
4113                                 $label = $matches[3];
4114                         } else {
4115                                 $label = '';
4116                         }
4117
4118                         $html = $this->recursiveTagParse( trim( $label ) );
4119
4120                         $ig->add( $nt, $html );
4121
4122                         # Only add real images (bug #5586)
4123                         if ( $nt->getNamespace() == NS_IMAGE ) {
4124                                 $this->mOutput->addImage( $nt->getDBkey() );
4125                         }
4126                 }
4127                 return $ig->toHTML();
4128         }
4129
4130         function getImageParams( $handler ) {
4131                 if ( $handler ) {
4132                         $handlerClass = get_class( $handler );
4133                 } else {
4134                         $handlerClass = '';
4135                 }
4136                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4137                         // Initialise static lists
4138                         static $internalParamNames = array(
4139                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4140                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4141                                         'bottom', 'text-bottom' ),
4142                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4143                                         'upright', 'border' ),
4144                         );
4145                         static $internalParamMap;
4146                         if ( !$internalParamMap ) {
4147                                 $internalParamMap = array();
4148                                 foreach ( $internalParamNames as $type => $names ) {
4149                                         foreach ( $names as $name ) {
4150                                                 $magicName = str_replace( '-', '_', "img_$name" );
4151                                                 $internalParamMap[$magicName] = array( $type, $name );
4152                                         }
4153                                 }
4154                         }
4155
4156                         // Add handler params
4157                         $paramMap = $internalParamMap;
4158                         if ( $handler ) {
4159                                 $handlerParamMap = $handler->getParamMap();
4160                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4161                                         $paramMap[$magic] = array( 'handler', $paramName );
4162                                 }
4163                         }
4164                         $this->mImageParams[$handlerClass] = $paramMap;
4165                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4166                 }
4167                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4168         }
4169
4170         /**
4171          * Parse image options text and use it to make an image
4172          * @param Title $title
4173          * @param string $options
4174          * @param LinkHolderArray $holders
4175          */
4176         function makeImage( $title, $options, $holders = false ) {
4177                 # Check if the options text is of the form "options|alt text"
4178                 # Options are:
4179                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4180                 #  * left               no resizing, just left align. label is used for alt= only
4181                 #  * right              same, but right aligned
4182                 #  * none               same, but not aligned
4183                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4184                 #  * center             center the image
4185                 #  * framed             Keep original image size, no magnify-button.
4186                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4187                 #  * upright            reduce width for upright images, rounded to full __0 px
4188                 #  * border             draw a 1px border around the image
4189                 # vertical-align values (no % or length right now):
4190                 #  * baseline
4191                 #  * sub
4192                 #  * super
4193                 #  * top
4194                 #  * text-top
4195                 #  * middle
4196                 #  * bottom
4197                 #  * text-bottom
4198
4199                 $parts = StringUtils::explode( "|", $options );
4200                 $sk = $this->mOptions->getSkin();
4201
4202                 # Give extensions a chance to select the file revision for us
4203                 $skip = $time = $descQuery = false;
4204                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4205
4206                 if ( $skip ) {
4207                         return $sk->link( $title );
4208                 }
4209
4210                 # Get parameter map
4211                 $file = wfFindFile( $title, $time );
4212                 $handler = $file ? $file->getHandler() : false;
4213
4214                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4215
4216                 # Process the input parameters
4217                 $caption = '';
4218                 $params = array( 'frame' => array(), 'handler' => array(),
4219                         'horizAlign' => array(), 'vertAlign' => array() );
4220                 foreach( $parts as $part ) {
4221                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4222                         $validated = false;
4223                         if( isset( $paramMap[$magicName] ) ) {
4224                                 list( $type, $paramName ) = $paramMap[$magicName];
4225
4226                                 // Special case; width and height come in one variable together
4227                                 if( $type == 'handler' && $paramName == 'width' ) {
4228                                         $m = array();
4229                                         # (bug 13500) In both cases (width/height and width only),
4230                                         # permit trailing "px" for backward compatibility.
4231                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4232                                                 $width = intval( $m[1] );
4233                                                 $height = intval( $m[2] );
4234                                                 if ( $handler->validateParam( 'width', $width ) ) {
4235                                                         $params[$type]['width'] = $width;
4236                                                         $validated = true;
4237                                                 }
4238                                                 if ( $handler->validateParam( 'height', $height ) ) {
4239                                                         $params[$type]['height'] = $height;
4240                                                         $validated = true;
4241                                                 }
4242                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4243                                                 $width = intval( $value );
4244                                                 if ( $handler->validateParam( 'width', $width ) ) {
4245                                                         $params[$type]['width'] = $width;
4246                                                         $validated = true;
4247                                                 }
4248                                         } // else no validation -- bug 13436
4249                                 } else {
4250                                         if ( $type == 'handler' ) {
4251                                                 # Validate handler parameter
4252                                                 $validated = $handler->validateParam( $paramName, $value );
4253                                         } else {
4254                                                 # Validate internal parameters
4255                                                 switch( $paramName ) {
4256                                                 case "manualthumb":
4257                                                         /// @fixme - possibly check validity here?
4258                                                         /// downstream behavior seems odd with missing manual thumbs.
4259                                                         $validated = true;
4260                                                         break;
4261                                                 default:
4262                                                         // Most other things appear to be empty or numeric...
4263                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4264                                                 }
4265                                         }
4266
4267                                         if ( $validated ) {
4268                                                 $params[$type][$paramName] = $value;
4269                                         }
4270                                 }
4271                         }
4272                         if ( !$validated ) {
4273                                 $caption = $part;
4274                         }
4275                 }
4276
4277                 # Process alignment parameters
4278                 if ( $params['horizAlign'] ) {
4279                         $params['frame']['align'] = key( $params['horizAlign'] );
4280                 }
4281                 if ( $params['vertAlign'] ) {
4282                         $params['frame']['valign'] = key( $params['vertAlign'] );
4283                 }
4284
4285                 # Strip bad stuff out of the alt text
4286                 # We can't just use replaceLinkHoldersText() here, because if this function
4287                 # is called from replaceInternalLinks2(), mLinkHolders won't be up to date.
4288                 if ( $holders ) {
4289                         $alt = $holders->replaceText( $caption );
4290                 } else {
4291                         $alt = $this->replaceLinkHoldersText( $caption );
4292                 }
4293
4294                 # make sure there are no placeholders in thumbnail attributes
4295                 # that are later expanded to html- so expand them now and
4296                 # remove the tags
4297                 $alt = $this->mStripState->unstripBoth( $alt );
4298                 $alt = Sanitizer::stripAllTags( $alt );
4299
4300                 $params['frame']['alt'] = $alt;
4301                 $params['frame']['caption'] = $caption;
4302
4303                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4304
4305                 # Linker does the rest
4306                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4307
4308                 # Give the handler a chance to modify the parser object
4309                 if ( $handler ) {
4310                         $handler->parserTransformHook( $this, $file );
4311                 }
4312
4313                 return $ret;
4314         }
4315
4316         /**
4317          * Set a flag in the output object indicating that the content is dynamic and
4318          * shouldn't be cached.
4319          */
4320         function disableCache() {
4321                 wfDebug( "Parser output marked as uncacheable.\n" );
4322                 $this->mOutput->mCacheTime = -1;
4323         }
4324
4325         /**#@+
4326          * Callback from the Sanitizer for expanding items found in HTML attribute
4327          * values, so they can be safely tested and escaped.
4328          * @param string $text
4329          * @param PPFrame $frame
4330          * @return string
4331          * @private
4332          */
4333         function attributeStripCallback( &$text, $frame = false ) {
4334                 $text = $this->replaceVariables( $text, $frame );
4335                 $text = $this->mStripState->unstripBoth( $text );
4336                 return $text;
4337         }
4338
4339         /**#@-*/
4340
4341         /**#@+
4342          * Accessor/mutator
4343          */
4344         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4345         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4346         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4347         /**#@-*/
4348
4349         /**#@+
4350          * Accessor
4351          */
4352         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4353         /**#@-*/
4354
4355
4356         /**
4357          * Break wikitext input into sections, and either pull or replace
4358          * some particular section's text.
4359          *
4360          * External callers should use the getSection and replaceSection methods.
4361          *
4362          * @param string $text Page wikitext
4363          * @param string $section A section identifier string of the form:
4364          *   <flag1> - <flag2> - ... - <section number>
4365          *
4366          * Currently the only recognised flag is "T", which means the target section number
4367          * was derived during a template inclusion parse, in other words this is a template
4368          * section edit link. If no flags are given, it was an ordinary section edit link.
4369          * This flag is required to avoid a section numbering mismatch when a section is
4370          * enclosed by <includeonly> (bug 6563).
4371          *
4372          * The section number 0 pulls the text before the first heading; other numbers will
4373          * pull the given section along with its lower-level subsections. If the section is
4374          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4375          *
4376          * @param string $mode One of "get" or "replace"
4377          * @param string $newText Replacement text for section data.
4378          * @return string for "get", the extracted section text.
4379          *                for "replace", the whole page with the section replaced.
4380          */
4381         private function extractSections( $text, $section, $mode, $newText='' ) {
4382                 global $wgTitle;
4383                 $this->clearState();
4384                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4385                 $this->mOptions = new ParserOptions;
4386                 $this->setOutputType( self::OT_WIKI );
4387                 $outText = '';
4388                 $frame = $this->getPreprocessor()->newFrame();
4389
4390                 // Process section extraction flags
4391                 $flags = 0;
4392                 $sectionParts = explode( '-', $section );
4393                 $sectionIndex = array_pop( $sectionParts );
4394                 foreach ( $sectionParts as $part ) {
4395                         if ( $part == 'T' ) {
4396                                 $flags |= self::PTD_FOR_INCLUSION;
4397                         }
4398                 }
4399                 // Preprocess the text
4400                 $root = $this->preprocessToDom( $text, $flags );
4401
4402                 // <h> nodes indicate section breaks
4403                 // They can only occur at the top level, so we can find them by iterating the root's children
4404                 $node = $root->getFirstChild();
4405
4406                 // Find the target section
4407                 if ( $sectionIndex == 0 ) {
4408                         // Section zero doesn't nest, level=big
4409                         $targetLevel = 1000;
4410                 } else {
4411             while ( $node ) {
4412                 if ( $node->getName() == 'h' ) {
4413                     $bits = $node->splitHeading();
4414                                         if ( $bits['i'] == $sectionIndex ) {
4415                                         $targetLevel = $bits['level'];
4416                                                 break;
4417                                         }
4418                                 }
4419                                 if ( $mode == 'replace' ) {
4420                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4421                                 }
4422                                 $node = $node->getNextSibling();
4423                         }
4424                 }
4425
4426                 if ( !$node ) {
4427                         // Not found
4428                         if ( $mode == 'get' ) {
4429                                 return $newText;
4430                         } else {
4431                                 return $text;
4432                         }
4433                 }
4434
4435                 // Find the end of the section, including nested sections
4436                 do {
4437                         if ( $node->getName() == 'h' ) {
4438                                 $bits = $node->splitHeading();
4439                                 $curLevel = $bits['level'];
4440                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4441                                         break;
4442                                 }
4443                         }
4444                         if ( $mode == 'get' ) {
4445                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4446                         }
4447                         $node = $node->getNextSibling();
4448                 } while ( $node );
4449
4450                 // Write out the remainder (in replace mode only)
4451                 if ( $mode == 'replace' ) {
4452                         // Output the replacement text
4453                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4454                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4455                         $outText .= $newText . "\n\n";
4456                         while ( $node ) {
4457                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4458                                 $node = $node->getNextSibling();
4459                         }
4460                 }
4461
4462                 if ( is_string( $outText ) ) {
4463                         // Re-insert stripped tags
4464                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4465                 }
4466
4467                 return $outText;
4468         }
4469
4470         /**
4471          * This function returns the text of a section, specified by a number ($section).
4472          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4473          * the first section before any such heading (section 0).
4474          *
4475          * If a section contains subsections, these are also returned.
4476          *
4477          * @param string $text text to look in
4478          * @param string $section section identifier
4479          * @param string $deftext default to return if section is not found
4480          * @return string text of the requested section
4481          */
4482         public function getSection( $text, $section, $deftext='' ) {
4483                 return $this->extractSections( $text, $section, "get", $deftext );
4484         }
4485
4486         public function replaceSection( $oldtext, $section, $text ) {
4487                 return $this->extractSections( $oldtext, $section, "replace", $text );
4488         }
4489
4490         /**
4491          * Get the timestamp associated with the current revision, adjusted for
4492          * the default server-local timestamp
4493          */
4494         function getRevisionTimestamp() {
4495                 if ( is_null( $this->mRevisionTimestamp ) ) {
4496                         wfProfileIn( __METHOD__ );
4497                         global $wgContLang;
4498                         $dbr = wfGetDB( DB_SLAVE );
4499                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4500                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4501
4502                         // Normalize timestamp to internal MW format for timezone processing.
4503                         // This has the added side-effect of replacing a null value with
4504                         // the current time, which gives us more sensible behavior for
4505                         // previews.
4506                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4507
4508                         // The cryptic '' timezone parameter tells to use the site-default
4509                         // timezone offset instead of the user settings.
4510                         //
4511                         // Since this value will be saved into the parser cache, served
4512                         // to other users, and potentially even used inside links and such,
4513                         // it needs to be consistent for all visitors.
4514                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4515
4516                         wfProfileOut( __METHOD__ );
4517                 }
4518                 return $this->mRevisionTimestamp;
4519         }
4520
4521         /**
4522          * Mutator for $mDefaultSort
4523          *
4524          * @param $sort New value
4525          */
4526         public function setDefaultSort( $sort ) {
4527                 $this->mDefaultSort = $sort;
4528         }
4529
4530         /**
4531          * Accessor for $mDefaultSort
4532          * Will use the title/prefixed title if none is set
4533          *
4534          * @return string
4535          */
4536         public function getDefaultSort() {
4537                 global $wgCategoryPrefixedDefaultSortkey;
4538                 if( $this->mDefaultSort !== false ) {
4539                         return $this->mDefaultSort;
4540                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4541                         !$wgCategoryPrefixedDefaultSortkey) {
4542                         return $this->mTitle->getText();
4543                 } else {
4544                         return $this->mTitle->getPrefixedText();
4545                 }
4546         }
4547
4548         /**
4549          * Try to guess the section anchor name based on a wikitext fragment
4550          * presumably extracted from a heading, for example "Header" from
4551          * "== Header ==".
4552          */
4553         public function guessSectionNameFromWikiText( $text ) {
4554                 # Strip out wikitext links(they break the anchor)
4555                 $text = $this->stripSectionName( $text );
4556                 $headline = Sanitizer::decodeCharReferences( $text );
4557                 # strip out HTML
4558                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4559                 $headline = trim( $headline );
4560                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4561                 $replacearray = array(
4562                         '%3A' => ':',
4563                         '%' => '.'
4564                 );
4565                 return str_replace(
4566                         array_keys( $replacearray ),
4567                         array_values( $replacearray ),
4568                         $sectionanchor );
4569         }
4570
4571         /**
4572          * Strips a text string of wikitext for use in a section anchor
4573          *
4574          * Accepts a text string and then removes all wikitext from the
4575          * string and leaves only the resultant text (i.e. the result of
4576          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4577          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4578          * to create valid section anchors by mimicing the output of the
4579          * parser when headings are parsed.
4580          *
4581          * @param $text string Text string to be stripped of wikitext
4582          * for use in a Section anchor
4583          * @return Filtered text string
4584          */
4585         public function stripSectionName( $text ) {
4586                 # Strip internal link markup
4587                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4588                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4589
4590                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4591                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4592                 # on how many empty links there are on the page - need to figure that out.
4593                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4594
4595                 # Parse wikitext quotes (italics & bold)
4596                 $text = $this->doQuotes($text);
4597
4598                 # Strip HTML tags
4599                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4600                 return $text;
4601         }
4602
4603         function srvus( $text ) {
4604                 return $this->testSrvus( $text, $this->mOutputType );
4605         }
4606
4607         /**
4608          * strip/replaceVariables/unstrip for preprocessor regression testing
4609          */
4610         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
4611                 $this->clearState();
4612                 if ( ! ( $title instanceof Title ) ) {
4613                         $title = Title::newFromText( $title );
4614                 }
4615                 $this->mTitle = $title;
4616                 $this->mOptions = $options;
4617                 $this->setOutputType( $outputType );
4618                 $text = $this->replaceVariables( $text );
4619                 $text = $this->mStripState->unstripBoth( $text );
4620                 $text = Sanitizer::removeHTMLtags( $text );
4621                 return $text;
4622         }
4623
4624         function testPst( $text, $title, $options ) {
4625                 global $wgUser;
4626                 if ( ! ( $title instanceof Title ) ) {
4627                         $title = Title::newFromText( $title );
4628                 }
4629                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
4630         }
4631
4632         function testPreprocess( $text, $title, $options ) {
4633                 if ( ! ( $title instanceof Title ) ) {
4634                         $title = Title::newFromText( $title );
4635                 }
4636                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
4637         }
4638
4639         function markerSkipCallback( $s, $callback ) {
4640                 $i = 0;
4641                 $out = '';
4642                 while ( $i < strlen( $s ) ) {
4643                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
4644                         if ( $markerStart === false ) {
4645                                 $out .= call_user_func( $callback, substr( $s, $i ) );
4646                                 break;
4647                         } else {
4648                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
4649                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
4650                                 if ( $markerEnd === false ) {
4651                                         $out .= substr( $s, $markerStart );
4652                                         break;
4653                                 } else {
4654                                         $markerEnd += strlen( self::MARKER_SUFFIX );
4655                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
4656                                         $i = $markerEnd;
4657                                 }
4658                         }
4659                 }
4660                 return $out;
4661         }
4662 }
4663
4664 /**
4665  * @todo document, briefly.
4666  * @ingroup Parser
4667  */
4668 class StripState {
4669         var $general, $nowiki;
4670
4671         function __construct() {
4672                 $this->general = new ReplacementArray;
4673                 $this->nowiki = new ReplacementArray;
4674         }
4675
4676         function unstripGeneral( $text ) {
4677                 wfProfileIn( __METHOD__ );
4678                 do {
4679                         $oldText = $text;
4680                         $text = $this->general->replace( $text );
4681                 } while ( $text != $oldText );
4682                 wfProfileOut( __METHOD__ );
4683                 return $text;
4684         }
4685
4686         function unstripNoWiki( $text ) {
4687                 wfProfileIn( __METHOD__ );
4688                 do {
4689                         $oldText = $text;
4690                         $text = $this->nowiki->replace( $text );
4691                 } while ( $text != $oldText );
4692                 wfProfileOut( __METHOD__ );
4693                 return $text;
4694         }
4695
4696         function unstripBoth( $text ) {
4697                 wfProfileIn( __METHOD__ );
4698                 do {
4699                         $oldText = $text;
4700                         $text = $this->general->replace( $text );
4701                         $text = $this->nowiki->replace( $text );
4702                 } while ( $text != $oldText );
4703                 wfProfileOut( __METHOD__ );
4704                 return $text;
4705         }
4706 }
4707
4708 /**
4709  * @todo document, briefly.
4710  * @ingroup Parser
4711  */
4712 class OnlyIncludeReplacer {
4713         var $output = '';
4714
4715         function replace( $matches ) {
4716                 if ( substr( $matches[1], -1 ) == "\n" ) {
4717                         $this->output .= substr( $matches[1], 0, -1 );
4718                 } else {
4719                         $this->output .= $matches[1];
4720                 }
4721         }
4722 }