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, $mUrlProtocols, $mDefaultStripList, $mVarCache, $mConf,
  96                 $mFunctionTagHooks, $mDoTitleConvert, $mDoContentConvert;
  97
  98
  99         # Cleared with clearState():
 100         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 101         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 102         var $mLinkHolders, $mLinkID;
 103         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 104         var $mTplExpandCache; // empty-frame expansion cache
 105         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 106         var $mExpensiveFunctionCount; // number of expensive parser function calls
 107
 108         # Temporary
 109         # These are variables reset at least once per parse regardless of $clearState
 110         var $mOptions,      // ParserOptions object
 111                 $mTitle,        // Title context, used for self-link rendering and similar things
 112                 $mOutputType,   // Output type, one of the OT_xxx constants
 113                 $ot,            // Shortcut alias, see setOutputType()
 114                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 115                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 116                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 117
 118         /**#@-*/
 119
 120         /**
 121          * Constructor
 122          *
 123          * @public
 124          */
 125         function __construct( $conf = array() ) {
 126                 $this->mConf = $conf;
 127                 $this->mTagHooks = array();
 128                 $this->mTransparentTagHooks = array();
 129                 $this->mFunctionHooks = array();
 130                 $this->mFunctionTagHooks = array();
 131                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 132                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery', 'a' );
 133                 $this->mUrlProtocols = wfUrlProtocols();
 134                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 135                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 136                 $this->mVarCache = array();
 137                 if ( isset( $conf['preprocessorClass'] ) ) {
 138                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 139                 } elseif ( extension_loaded( 'domxml' ) ) {
 140                         // PECL extension that conflicts with the core DOM extension (bug 13770)
 141                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 142                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 143                 } elseif ( extension_loaded( 'dom' ) ) {
 144                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 145                 } else {
 146                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 147                 }
 148                 $this->mMarkerIndex = 0;
 149                 $this->mFirstCall = true;
 150                 $this->mDoTitleConvert = true;
 151                 $this->mDoContentConvert = true;
 152         }
 153
 154         /**
 155          * Reduce memory usage to reduce the impact of circular references
 156          */
 157         function __destruct() {
 158                 if ( isset( $this->mLinkHolders ) ) {
 159                         $this->mLinkHolders->__destruct();
 160                 }
 161                 foreach ( $this as $name => $value ) {
 162                         unset( $this->$name );
 163                 }
 164         }
 165
 166         /**
 167          * Do various kinds of initialisation on the first call of the parser
 168          */
 169         function firstCallInit() {
 170                 if ( !$this->mFirstCall ) {
 171                         return;
 172                 }
 173                 $this->mFirstCall = false;
 174
 175                 wfProfileIn( __METHOD__ );
 176
 177                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 178                 CoreParserFunctions::register( $this );
 179                 $this->initialiseVariables();
 180
 181                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 182                 wfProfileOut( __METHOD__ );
 183         }
 184
 185         /**
 186          * Clear Parser state
 187          *
 188          * @private
 189          */
 190         function clearState() {
 191                 wfProfileIn( __METHOD__ );
 192                 if ( $this->mFirstCall ) {
 193                         $this->firstCallInit();
 194                 }
 195                 $this->mOutput = new ParserOutput;
 196                 $this->mAutonumber = 0;
 197                 $this->mLastSection = '';
 198                 $this->mDTopen = false;
 199                 $this->mIncludeCount = array();
 200                 $this->mStripState = new StripState;
 201                 $this->mArgStack = false;
 202                 $this->mInPre = false;
 203                 $this->mLinkHolders = new LinkHolderArray( $this );
 204                 $this->mLinkID = 0;
 205                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 206                 $this->mVarCache = array();
 207
 208                 /**
 209                  * Prefix for temporary replacement strings for the multipass parser.
 210                  * \x07 should never appear in input as it's disallowed in XML.
 211                  * Using it at the front also gives us a little extra robustness
 212                  * since it shouldn't match when butted up against identifier-like
 213                  * string constructs.
 214                  *
 215                  * Must not consist of all title characters, or else it will change
 216                  * the behaviour of <nowiki> in a link.
 217                  */
 218                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 219                 # Changed to \x7f to allow XML double-parsing -- TS
 220                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 221
 222
 223                 # Clear these on every parse, bug 4549
 224                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 225
 226                 $this->mShowToc = true;
 227                 $this->mForceTocPosition = false;
 228                 $this->mIncludeSizes = array(
 229                         'post-expand' => 0,
 230                         'arg' => 0,
 231                 );
 232                 $this->mPPNodeCount = 0;
 233                 $this->mDefaultSort = false;
 234                 $this->mHeadings = array();
 235                 $this->mDoubleUnderscores = array();
 236                 $this->mExpensiveFunctionCount = 0;
 237
 238                 # Fix cloning
 239                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 240                         $this->mPreprocessor = null;
 241                 }
 242
 243                 wfRunHooks( 'ParserClearState', array( &$this ) );
 244                 wfProfileOut( __METHOD__ );
 245         }
 246
 247         function setOutputType( $ot ) {
 248                 $this->mOutputType = $ot;
 249                 // Shortcut alias
 250                 $this->ot = array(
 251                         'html' => $ot == self::OT_HTML,
 252                         'wiki' => $ot == self::OT_WIKI,
 253                         'pre' => $ot == self::OT_PREPROCESS,
 254                 );
 255         }
 256
 257         /**
 258          * Set the context title
 259          */
 260         function setTitle( $t ) {
 261                 // If don't have a Title object, then convert what we have to
 262                 // a string and then to Title.  If you pass in an object, make
 263                 // sure it has a __toString() method or you'll get a
 264                 // "Catchable fatal error"
 265                 if ( $t && !($t instanceOf FakeTitle)
 266                          && !($t instanceOf Title) ) {
 267                         $t = Title::newFromText( "$t" );
 268                 }
 269
 270                 if ( !($t instanceOf Title) ) {
 271                         $t = Title::newFromText( 'NO TITLE' );
 272                 }
 273
 274                 if ( strval( $t->getFragment() ) !== '' ) {
 275                         # Strip the fragment to avoid various odd effects
 276                         $this->mTitle = clone $t;
 277                         $this->mTitle->setFragment( '' );
 278                 } else {
 279                         $this->mTitle = $t;
 280                 }
 281         }
 282
 283         /**
 284          * Accessor for mUniqPrefix.
 285          *
 286          * @public
 287          */
 288         function uniqPrefix() {
 289                 if( !isset( $this->mUniqPrefix ) ) {
 290                         // @todo Fixme: this is probably *horribly wrong*
 291                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 292                         // if this is called for a parser cache hit, the parser may not
 293                         // have ever been initialized in the first place.
 294                         // Not really sure what the heck is supposed to be going on here.
 295                         return '';
 296                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 297                 }
 298                 return $this->mUniqPrefix;
 299         }
 300
 301         /**
 302          * Convert wikitext to HTML
 303          * Do not call this function recursively.
 304          *
 305          * @param $text String: text we want to parse
 306          * @param $title A title object
 307          * @param $options ParserOptions
 308          * @param $linestart boolean
 309          * @param $clearState boolean
 310          * @param $revid Int: number to pass in {{REVISIONID}}
 311          * @return ParserOutput a ParserOutput
 312          */
 313         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 314                 /**
 315                  * First pass--just handle <nowiki> sections, pass the rest off
 316                  * to internalParse() which does all the real work.
 317                  */
 318
 319                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 320                 $fname = __METHOD__.'-' . wfGetCaller();
 321                 wfProfileIn( __METHOD__ );
 322                 wfProfileIn( $fname );
 323
 324                 if ( $clearState ) {
 325                         $this->clearState();
 326                 }
 327
 328                 $this->mOptions = $options;
 329                 $this->setTitle( $title ); // Page title has to be set for the pre-processor
 330
 331                 $oldRevisionId = $this->mRevisionId;
 332                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 333                 if( $revid !== null ) {
 334                         $this->mRevisionId = $revid;
 335                         $this->mRevisionTimestamp = null;
 336                 }
 337                 $this->setOutputType( self::OT_HTML );
 338                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 339                 # No more strip!
 340                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 341                 $text = $this->internalParse( $text );
 342
 343                 $text = $this->mStripState->unstripGeneral( $text );
 344
 345                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 346                 $fixtags = array(
 347                         # french spaces, last one Guillemet-left
 348                         # only if there is something before the space
 349                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 350                         # french spaces, Guillemet-right
 351                         '/(\\302\\253) /' => '\\1&nbsp;',
 352                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 353                 );
 354                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 355
 356                 $text = $this->doBlockLevels( $text, $linestart );
 357
 358                 $this->replaceLinkHolders( $text );
 359
 360                 // The position of the convert() call should not be changed. it
 361                 // assumes that the links are all replaced and the only thing left
 362                 // is the <nowiki> mark.
 363                 if ( $this->mDoContentConvert && !$this->mTitle->isConversionTable()) {
 364                         $text = $wgContLang->convert( $text );
 365                 }
 366
 367                 // A title may have been set in a conversion rule.
 368                 // Note that if a user tries to set a title in a conversion
 369                 // rule but content conversion was not done, then the parser
 370                 // won't pick it up.  This is probably expected behavior.
 371                 if ( $wgContLang->getConvRuleTitle() ) {
 372                         $this->setTitle( $wgContLang->getConvRuleTitle() );
 373                 } elseif ( $this->mDoTitleConvert && !$this->mTitle->isConversionTable() ) {
 374                         $this->setTitle( $wgContLang->convert( $title ) );
 375                 }
 376
 377                 $text = $this->mStripState->unstripNoWiki( $text );
 378
 379                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 380
 381 //!JF Move to its own function
 382
 383                 $uniq_prefix = $this->mUniqPrefix;
 384                 $matches = array();
 385                 $elements = array_keys( $this->mTransparentTagHooks );
 386                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 387
 388                 foreach( $matches as $marker => $data ) {
 389                         list( $element, $content, $params, $tag ) = $data;
 390                         $tagName = strtolower( $element );
 391                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 392                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 393                                         array( $content, $params, $this ) );
 394                         } else {
 395                                 $output = $tag;
 396                         }
 397                         $this->mStripState->general->setPair( $marker, $output );
 398                 }
 399                 $text = $this->mStripState->unstripGeneral( $text );
 400
 401                 $text = Sanitizer::normalizeCharReferences( $text );
 402
 403                 if ( ( $wgUseTidy && $this->mOptions->mTidy ) || $wgAlwaysUseTidy ) {
 404                         $text = MWTidy::tidy( $text );
 405                 } else {
 406                         # attempt to sanitize at least some nesting problems
 407                         # (bug #2702 and quite a few others)
 408                         $tidyregs = array(
 409                                 # ''Something [http://www.cool.com cool''] -->
 410                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 411                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 412                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 413                                 # fix up an anchor inside another anchor, only
 414                                 # at least for a single single nested link (bug 3695)
 415                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 416                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 417                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 418                                 # contains a div, so fix it up here; replace
 419                                 # div with escaped text
 420                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 421                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 422                                 # remove empty italic or bold tag pairs, some
 423                                 # introduced by rules above
 424                                 '/<([bi])><\/\\1>/' => '',
 425                         );
 426
 427                         $text = preg_replace(
 428                                 array_keys( $tidyregs ),
 429                                 array_values( $tidyregs ),
 430                                 $text );
 431                 }
 432                 global $wgExpensiveParserFunctionLimit;
 433                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 434                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 435                 }
 436
 437                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 438
 439                 # Information on include size limits, for the benefit of users who try to skirt them
 440                 if ( $this->mOptions->getEnableLimitReport() ) {
 441                         global $wgExpensiveParserFunctionLimit;
 442                         $max = $this->mOptions->getMaxIncludeSize();
 443                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 444                         $limitReport =
 445                                 "NewPP limit report\n" .
 446                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 447                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 448                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 449                                 $PFreport;
 450                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 451                         $text .= "\n<!-- \n$limitReport-->\n";
 452                 }
 453                 $this->mOutput->setText( $text );
 454                 $this->mRevisionId = $oldRevisionId;
 455                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 456                 wfProfileOut( $fname );
 457                 wfProfileOut( __METHOD__ );
 458
 459                 return $this->mOutput;
 460         }
 461
 462         /**
 463          * Recursive parser entry point that can be called from an extension tag
 464          * hook.
 465          *
 466          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 467          *
 468          * @param $text String: text extension wants to have parsed
 469          * @param PPFrame $frame: The frame to use for expanding any template variables
 470          */
 471         function recursiveTagParse( $text, $frame=false ) {
 472                 wfProfileIn( __METHOD__ );
 473                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 474                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 475                 $text = $this->internalParse( $text, false, $frame );
 476                 wfProfileOut( __METHOD__ );
 477                 return $text;
 478         }
 479
 480         /**
 481          * Expand templates and variables in the text, producing valid, static wikitext.
 482          * Also removes comments.
 483          */
 484         function preprocess( $text, $title, $options, $revid = null ) {
 485                 wfProfileIn( __METHOD__ );
 486                 $this->clearState();
 487                 $this->setOutputType( self::OT_PREPROCESS );
 488                 $this->mOptions = $options;
 489                 $this->setTitle( $title );
 490                 if( $revid !== null ) {
 491                         $this->mRevisionId = $revid;
 492                 }
 493                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 494                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 495                 $text = $this->replaceVariables( $text );
 496                 $text = $this->mStripState->unstripBoth( $text );
 497                 wfProfileOut( __METHOD__ );
 498                 return $text;
 499         }
 500
 501         /**
 502          * Get a random string
 503          *
 504          * @private
 505          * @static
 506          */
 507         function getRandomString() {
 508                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 509         }
 510
 511         function &getTitle() { return $this->mTitle; }
 512         function getOptions() { return $this->mOptions; }
 513         function getRevisionId() { return $this->mRevisionId; }
 514         function getOutput() { return $this->mOutput; }
 515         function nextLinkID() { return $this->mLinkID++; }
 516
 517         function getFunctionLang() {
 518                 global $wgLang, $wgContLang;
 519
 520                 $target = $this->mOptions->getTargetLanguage();
 521                 if ( $target !== null ) {
 522                         return $target;
 523                 } else {
 524                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 525                 }
 526         }
 527
 528         /**
 529          * Get a preprocessor object
 530          */
 531         function getPreprocessor() {
 532                 if ( !isset( $this->mPreprocessor ) ) {
 533                         $class = $this->mPreprocessorClass;
 534                         $this->mPreprocessor = new $class( $this );
 535                 }
 536                 return $this->mPreprocessor;
 537         }
 538
 539         /**
 540          * Replaces all occurrences of HTML-style comments and the given tags
 541          * in the text with a random marker and returns the next text. The output
 542          * parameter $matches will be an associative array filled with data in
 543          * the form:
 544          *   'UNIQ-xxxxx' => array(
 545          *     'element',
 546          *     'tag content',
 547          *     array( 'param' => 'x' ),
 548          *     '<element param="x">tag content</element>' ) )
 549          *
 550          * @param $elements list of element names. Comments are always extracted.
 551          * @param $text Source text string.
 552          * @param $uniq_prefix
 553          *
 554          * @public
 555          * @static
 556          */
 557         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 558                 static $n = 1;
 559                 $stripped = '';
 560                 $matches = array();
 561
 562                 $taglist = implode( '|', $elements );
 563                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 564
 565                 while ( $text != '' ) {
 566                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 567                         $stripped .= $p[0];
 568                         if( count( $p ) < 5 ) {
 569                                 break;
 570                         }
 571                         if( count( $p ) > 5 ) {
 572                                 // comment
 573                                 $element    = $p[4];
 574                                 $attributes = '';
 575                                 $close      = '';
 576                                 $inside     = $p[5];
 577                         } else {
 578                                 // tag
 579                                 $element    = $p[1];
 580                                 $attributes = $p[2];
 581                                 $close      = $p[3];
 582                                 $inside     = $p[4];
 583                         }
 584
 585                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 586                         $stripped .= $marker;
 587
 588                         if ( $close === '/>' ) {
 589                                 // Empty element tag, <tag />
 590                                 $content = null;
 591                                 $text = $inside;
 592                                 $tail = null;
 593                         } else {
 594                                 if( $element === '!--' ) {
 595                                         $end = '/(-->)/';
 596                                 } else {
 597                                         $end = "/(<\\/$element\\s*>)/i";
 598                                 }
 599                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 600                                 $content = $q[0];
 601                                 if( count( $q ) < 3 ) {
 602                                         # No end tag -- let it run out to the end of the text.
 603                                         $tail = '';
 604                                         $text = '';
 605                                 } else {
 606                                         $tail = $q[1];
 607                                         $text = $q[2];
 608                                 }
 609                         }
 610
 611                         $matches[$marker] = array( $element,
 612                                 $content,
 613                                 Sanitizer::decodeTagAttributes( $attributes ),
 614                                 "<$element$attributes$close$content$tail" );
 615                 }
 616                 return $stripped;
 617         }
 618
 619         /**
 620          * Get a list of strippable XML-like elements
 621          */
 622         function getStripList() {
 623                 global $wgRawHtml;
 624                 $elements = $this->mStripList;
 625                 if( $wgRawHtml ) {
 626                         $elements[] = 'html';
 627                 }
 628                 if( $this->mOptions->getUseTeX() ) {
 629                         $elements[] = 'math';
 630                 }
 631                 return $elements;
 632         }
 633
 634         /**
 635          * @deprecated use replaceVariables
 636          */
 637         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 638                 return $text;
 639         }
 640
 641         /**
 642          * Restores pre, math, and other extensions removed by strip()
 643          *
 644          * always call unstripNoWiki() after this one
 645          * @private
 646          * @deprecated use $this->mStripState->unstrip()
 647          */
 648         function unstrip( $text, $state ) {
 649                 return $state->unstripGeneral( $text );
 650         }
 651
 652         /**
 653          * Always call this after unstrip() to preserve the order
 654          *
 655          * @private
 656          * @deprecated use $this->mStripState->unstrip()
 657          */
 658         function unstripNoWiki( $text, $state ) {
 659                 return $state->unstripNoWiki( $text );
 660         }
 661
 662         /**
 663          * @deprecated use $this->mStripState->unstripBoth()
 664          */
 665         function unstripForHTML( $text ) {
 666                 return $this->mStripState->unstripBoth( $text );
 667         }
 668
 669         /**
 670          * Add an item to the strip state
 671          * Returns the unique tag which must be inserted into the stripped text
 672          * The tag will be replaced with the original text in unstrip()
 673          *
 674          * @private
 675          */
 676         function insertStripItem( $text ) {
 677                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 678                 $this->mMarkerIndex++;
 679                 $this->mStripState->general->setPair( $rnd, $text );
 680                 return $rnd;
 681         }
 682
 683         /**
 684          * Interface with html tidy
 685          * @deprecated Use MWTidy::tidy()
 686          */
 687         public static function tidy( $text ) {
 688                 wfDeprecated( __METHOD__ );
 689                 return MWTidy::tidy( $text );
 690         }
 691
 692         /**
 693          * parse the wiki syntax used to render tables
 694          *
 695          * @private
 696          */
 697         function doTableStuff ( $text ) {
 698                 wfProfileIn( __METHOD__ );
 699
 700                 $lines = StringUtils::explode( "\n", $text );
 701                 $out = '';
 702                 $td_history = array (); // Is currently a td tag open?
 703                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 704                 $tr_history = array (); // Is currently a tr tag open?
 705                 $tr_attributes = array (); // history of tr attributes
 706                 $has_opened_tr = array(); // Did this table open a <tr> element?
 707                 $indent_level = 0; // indent level of the table
 708
 709                 foreach ( $lines as $outLine ) {
 710                         $line = trim( $outLine );
 711
 712                         if( $line == '' ) { // empty line, go to next line
 713                                 $out .= $outLine."\n";
 714                                 continue;
 715                         }
 716                         $first_character = $line[0];
 717                         $matches = array();
 718
 719                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 720                                 // First check if we are starting a new table
 721                                 $indent_level = strlen( $matches[1] );
 722
 723                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 724                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 725
 726                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 727                                 array_push ( $td_history , false );
 728                                 array_push ( $last_tag_history , '' );
 729                                 array_push ( $tr_history , false );
 730                                 array_push ( $tr_attributes , '' );
 731                                 array_push ( $has_opened_tr , false );
 732                         } else if ( count ( $td_history ) == 0 ) {
 733                                 // Don't do any of the following
 734                                 $out .= $outLine."\n";
 735                                 continue;
 736                         } else if ( substr ( $line , 0 , 2 ) === '|}' ) {
 737                                 // We are ending a table
 738                                 $line = '</table>' . substr ( $line , 2 );
 739                                 $last_tag = array_pop ( $last_tag_history );
 740
 741                                 if ( !array_pop ( $has_opened_tr ) ) {
 742                                         $line = "<tr><td></td></tr>{$line}";
 743                                 }
 744
 745                                 if ( array_pop ( $tr_history ) ) {
 746                                         $line = "</tr>{$line}";
 747                                 }
 748
 749                                 if ( array_pop ( $td_history ) ) {
 750                                         $line = "</{$last_tag}>{$line}";
 751                                 }
 752                                 array_pop ( $tr_attributes );
 753                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 754                         } else if ( substr ( $line , 0 , 2 ) === '|-' ) {
 755                                 // Now we have a table row
 756                                 $line = preg_replace( '#^\|-+#', '', $line );
 757
 758                                 // Whats after the tag is now only attributes
 759                                 $attributes = $this->mStripState->unstripBoth( $line );
 760                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 761                                 array_pop ( $tr_attributes );
 762                                 array_push ( $tr_attributes , $attributes );
 763
 764                                 $line = '';
 765                                 $last_tag = array_pop ( $last_tag_history );
 766                                 array_pop ( $has_opened_tr );
 767                                 array_push ( $has_opened_tr , true );
 768
 769                                 if ( array_pop ( $tr_history ) ) {
 770                                         $line = '</tr>';
 771                                 }
 772
 773                                 if ( array_pop ( $td_history ) ) {
 774                                         $line = "</{$last_tag}>{$line}";
 775                                 }
 776
 777                                 $outLine = $line;
 778                                 array_push ( $tr_history , false );
 779                                 array_push ( $td_history , false );
 780                                 array_push ( $last_tag_history , '' );
 781                         }
 782                         else if ( $first_character === '|' || $first_character === '!' || substr ( $line , 0 , 2 )  === '|+' ) {
 783                                 // This might be cell elements, td, th or captions
 784                                 if ( substr ( $line , 0 , 2 ) === '|+' ) {
 785                                         $first_character = '+';
 786                                         $line = substr ( $line , 1 );
 787                                 }
 788
 789                                 $line = substr ( $line , 1 );
 790
 791                                 if ( $first_character === '!' ) {
 792                                         $line = str_replace ( '!!' , '||' , $line );
 793                                 }
 794
 795                                 // Split up multiple cells on the same line.
 796                                 // FIXME : This can result in improper nesting of tags processed
 797                                 // by earlier parser steps, but should avoid splitting up eg
 798                                 // attribute values containing literal "||".
 799                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 800
 801                                 $outLine = '';
 802
 803                                 // Loop through each table cell
 804                                 foreach ( $cells as $cell )
 805                                 {
 806                                         $previous = '';
 807                                         if ( $first_character !== '+' )
 808                                         {
 809                                                 $tr_after = array_pop ( $tr_attributes );
 810                                                 if ( !array_pop ( $tr_history ) ) {
 811                                                         $previous = "<tr{$tr_after}>\n";
 812                                                 }
 813                                                 array_push ( $tr_history , true );
 814                                                 array_push ( $tr_attributes , '' );
 815                                                 array_pop ( $has_opened_tr );
 816                                                 array_push ( $has_opened_tr , true );
 817                                         }
 818
 819                                         $last_tag = array_pop ( $last_tag_history );
 820
 821                                         if ( array_pop ( $td_history ) ) {
 822                                                 $previous = "</{$last_tag}>{$previous}";
 823                                         }
 824
 825                                         if ( $first_character === '|' ) {
 826                                                 $last_tag = 'td';
 827                                         } else if ( $first_character === '!' ) {
 828                                                 $last_tag = 'th';
 829                                         } else if ( $first_character === '+' ) {
 830                                                 $last_tag = 'caption';
 831                                         } else {
 832                                                 $last_tag = '';
 833                                         }
 834
 835                                         array_push ( $last_tag_history , $last_tag );
 836
 837                                         // A cell could contain both parameters and data
 838                                         $cell_data = explode ( '|' , $cell , 2 );
 839
 840                                         // Bug 553: Note that a '|' inside an invalid link should not
 841                                         // be mistaken as delimiting cell parameters
 842                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 843                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 844                                         } else if ( count ( $cell_data ) == 1 )
 845                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 846                                         else {
 847                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 848                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 849                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 850                                         }
 851
 852                                         $outLine .= $cell;
 853                                         array_push ( $td_history , true );
 854                                 }
 855                         }
 856                         $out .= $outLine . "\n";
 857                 }
 858
 859                 // Closing open td, tr && table
 860                 while ( count ( $td_history ) > 0 )
 861                 {
 862                         if ( array_pop ( $td_history ) ) {
 863                                 $out .= "</td>\n";
 864                         }
 865                         if ( array_pop ( $tr_history ) ) {
 866                                 $out .= "</tr>\n";
 867                         }
 868                         if ( !array_pop ( $has_opened_tr ) ) {
 869                                 $out .= "<tr><td></td></tr>\n" ;
 870                         }
 871
 872                         $out .= "</table>\n";
 873                 }
 874
 875                 // Remove trailing line-ending (b/c)
 876                 if ( substr( $out, -1 ) === "\n" ) {
 877                         $out = substr( $out, 0, -1 );
 878                 }
 879
 880                 // special case: don't return empty table
 881                 if( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 882                         $out = '';
 883                 }
 884
 885                 wfProfileOut( __METHOD__ );
 886
 887                 return $out;
 888         }
 889
 890         /**
 891          * Helper function for parse() that transforms wiki markup into
 892          * HTML. Only called for $mOutputType == self::OT_HTML.
 893          *
 894          * @private
 895          */
 896         function internalParse( $text, $isMain = true, $frame=false ) {
 897                 wfProfileIn( __METHOD__ );
 898
 899                 $origText = $text;
 900
 901                 # Hook to suspend the parser in this state
 902                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 903                         wfProfileOut( __METHOD__ );
 904                         return $text ;
 905                 }
 906
 907                 // if $frame is provided, then use $frame for replacing any variables
 908                 if ($frame) {
 909                         // use frame depth to infer how include/noinclude tags should be handled
 910                         // depth=0 means this is the top-level document; otherwise it's an included document
 911                         if( !$frame->depth )
 912                                 $flag = 0;
 913                         else
 914                                 $flag = Parser::PTD_FOR_INCLUSION;
 915                         $dom = $this->preprocessToDom( $text, $flag );
 916                         $text = $frame->expand( $dom );
 917                 }
 918                 // if $frame is not provided, then use old-style replaceVariables
 919                 else {
 920                         $text = $this->replaceVariables( $text );
 921                 }
 922
 923                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 924                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 925
 926                 // Tables need to come after variable replacement for things to work
 927                 // properly; putting them before other transformations should keep
 928                 // exciting things like link expansions from showing up in surprising
 929                 // places.
 930                 $text = $this->doTableStuff( $text );
 931
 932                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 933
 934                 $text = $this->doDoubleUnderscore( $text );
 935
 936                 $text = $this->doHeadings( $text );
 937                 if( $this->mOptions->getUseDynamicDates() ) {
 938                         $df = DateFormatter::getInstance();
 939                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 940                 }
 941                 $text = $this->doAllQuotes( $text );
 942                 $text = $this->replaceInternalLinks( $text );
 943                 $text = $this->replaceExternalLinks( $text );
 944
 945                 # replaceInternalLinks may sometimes leave behind
 946                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 947                 $text = str_replace($this->mUniqPrefix.'NOPARSE', '', $text);
 948
 949                 $text = $this->doMagicLinks( $text );
 950                 $text = $this->formatHeadings( $text, $origText, $isMain );
 951
 952                 wfProfileOut( __METHOD__ );
 953                 return $text;
 954         }
 955
 956         /**
 957          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 958          * magic external links.
 959          *
 960          * DML
 961          * @private
 962          */
 963         function doMagicLinks( $text ) {
 964                 wfProfileIn( __METHOD__ );
 965                 $prots = $this->mUrlProtocols;
 966                 $urlChar = self::EXT_LINK_URL_CLASS;
 967                 $text = preg_replace_callback(
 968                         '!(?:                           # Start cases
 969                                 (<a.*?</a>) |               # m[1]: Skip link text
 970                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
 971                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
 972                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
 973                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
 974                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 975                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 976                                     [0-9Xx]                 # check digit
 977                                     \b)
 978                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 979                 wfProfileOut( __METHOD__ );
 980                 return $text;
 981         }
 982
 983         function magicLinkCallback( $m ) {
 984                 if ( isset( $m[1] ) && $m[1] !== '' ) {
 985                         # Skip anchor
 986                         return $m[0];
 987                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
 988                         # Skip HTML element
 989                         return $m[0];
 990                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
 991                         # Free external link
 992                         return $this->makeFreeExternalLink( $m[0] );
 993                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
 994                         # RFC or PMID
 995                         $CssClass = '';
 996                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
 997                                 $keyword = 'RFC';
 998                                 $urlmsg = 'rfcurl';
 999                                 $CssClass = 'mw-magiclink-rfc';
1000                                 $id = $m[4];
1001                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1002                                 $keyword = 'PMID';
1003                                 $urlmsg = 'pubmedurl';
1004                                 $CssClass = 'mw-magiclink-pmid';
1005                                 $id = $m[4];
1006                         } else {
1007                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1008                                         substr($m[0], 0, 20 ) . '"' );
1009                         }
1010                         $url = wfMsg( $urlmsg, $id);
1011                         $sk = $this->mOptions->getSkin();
1012                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
1013                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1014                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1015                         # ISBN
1016                         $isbn = $m[5];
1017                         $num = strtr( $isbn, array(
1018                                 '-' => '',
1019                                 ' ' => '',
1020                                 'x' => 'X',
1021                         ));
1022                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1023                         return'<a href="' .
1024                                 $titleObj->escapeLocalUrl() .
1025                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1026                 } else {
1027                         return $m[0];
1028                 }
1029         }
1030
1031         /**
1032          * Make a free external link, given a user-supplied URL
1033          * @return HTML
1034          * @private
1035          */
1036         function makeFreeExternalLink( $url ) {
1037                 global $wgContLang;
1038                 wfProfileIn( __METHOD__ );
1039
1040                 $sk = $this->mOptions->getSkin();
1041                 $trail = '';
1042
1043                 # The characters '<' and '>' (which were escaped by
1044                 # removeHTMLtags()) should not be included in
1045                 # URLs, per RFC 2396.
1046                 $m2 = array();
1047                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1048                         $trail = substr($url, $m2[0][1]) . $trail;
1049                         $url = substr($url, 0, $m2[0][1]);
1050                 }
1051
1052                 # Move trailing punctuation to $trail
1053                 $sep = ',;\.:!?';
1054                 # If there is no left bracket, then consider right brackets fair game too
1055                 if ( strpos( $url, '(' ) === false ) {
1056                         $sep .= ')';
1057                 }
1058
1059                 $numSepChars = strspn( strrev( $url ), $sep );
1060                 if ( $numSepChars ) {
1061                         $trail = substr( $url, -$numSepChars ) . $trail;
1062                         $url = substr( $url, 0, -$numSepChars );
1063                 }
1064
1065                 $url = Sanitizer::cleanUrl( $url );
1066
1067                 # Is this an external image?
1068                 $text = $this->maybeMakeExternalImage( $url );
1069                 if ( $text === false ) {
1070                         # Not an image, make a link
1071                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1072                                 $this->getExternalLinkAttribs( $url ) );
1073                         # Register it in the output object...
1074                         # Replace unnecessary URL escape codes with their equivalent characters
1075                         $pasteurized = self::replaceUnusualEscapes( $url );
1076                         $this->mOutput->addExternalLink( $pasteurized );
1077                 }
1078                 wfProfileOut( __METHOD__ );
1079                 return $text . $trail;
1080         }
1081
1082
1083         /**
1084          * Parse headers and return html
1085          *
1086          * @private
1087          */
1088         function doHeadings( $text ) {
1089                 wfProfileIn( __METHOD__ );
1090                 for ( $i = 6; $i >= 1; --$i ) {
1091                         $h = str_repeat( '=', $i );
1092                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1093                           "<h$i>\\1</h$i>", $text );
1094                 }
1095                 wfProfileOut( __METHOD__ );
1096                 return $text;
1097         }
1098
1099         /**
1100          * Replace single quotes with HTML markup
1101          * @private
1102          * @return string the altered text
1103          */
1104         function doAllQuotes( $text ) {
1105                 wfProfileIn( __METHOD__ );
1106                 $outtext = '';
1107                 $lines = StringUtils::explode( "\n", $text );
1108                 foreach ( $lines as $line ) {
1109                         $outtext .= $this->doQuotes( $line ) . "\n";
1110                 }
1111                 $outtext = substr($outtext, 0,-1);
1112                 wfProfileOut( __METHOD__ );
1113                 return $outtext;
1114         }
1115
1116         /**
1117          * Helper function for doAllQuotes()
1118          */
1119         public function doQuotes( $text ) {
1120                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1121                 if ( count( $arr ) == 1 )
1122                         return $text;
1123                 else
1124                 {
1125                         # First, do some preliminary work. This may shift some apostrophes from
1126                         # being mark-up to being text. It also counts the number of occurrences
1127                         # of bold and italics mark-ups.
1128                         $i = 0;
1129                         $numbold = 0;
1130                         $numitalics = 0;
1131                         foreach ( $arr as $r )
1132                         {
1133                                 if ( ( $i % 2 ) == 1 )
1134                                 {
1135                                         # If there are ever four apostrophes, assume the first is supposed to
1136                                         # be text, and the remaining three constitute mark-up for bold text.
1137                                         if ( strlen( $arr[$i] ) == 4 )
1138                                         {
1139                                                 $arr[$i-1] .= "'";
1140                                                 $arr[$i] = "'''";
1141                                         }
1142                                         # If there are more than 5 apostrophes in a row, assume they're all
1143                                         # text except for the last 5.
1144                                         else if ( strlen( $arr[$i] ) > 5 )
1145                                         {
1146                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1147                                                 $arr[$i] = "'''''";
1148                                         }
1149                                         # Count the number of occurrences of bold and italics mark-ups.
1150                                         # We are not counting sequences of five apostrophes.
1151                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1152                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1153                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1154                                 }
1155                                 $i++;
1156                         }
1157
1158                         # If there is an odd number of both bold and italics, it is likely
1159                         # that one of the bold ones was meant to be an apostrophe followed
1160                         # by italics. Which one we cannot know for certain, but it is more
1161                         # likely to be one that has a single-letter word before it.
1162                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1163                         {
1164                                 $i = 0;
1165                                 $firstsingleletterword = -1;
1166                                 $firstmultiletterword = -1;
1167                                 $firstspace = -1;
1168                                 foreach ( $arr as $r )
1169                                 {
1170                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1171                                         {
1172                                                 $x1 = substr ($arr[$i-1], -1);
1173                                                 $x2 = substr ($arr[$i-1], -2, 1);
1174                                                 if ($x1 === ' ') {
1175                                                         if ($firstspace == -1) $firstspace = $i;
1176                                                 } else if ($x2 === ' ') {
1177                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1178                                                 } else {
1179                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1180                                                 }
1181                                         }
1182                                         $i++;
1183                                 }
1184
1185                                 # If there is a single-letter word, use it!
1186                                 if ($firstsingleletterword > -1)
1187                                 {
1188                                         $arr [ $firstsingleletterword ] = "''";
1189                                         $arr [ $firstsingleletterword-1 ] .= "'";
1190                                 }
1191                                 # If not, but there's a multi-letter word, use that one.
1192                                 else if ($firstmultiletterword > -1)
1193                                 {
1194                                         $arr [ $firstmultiletterword ] = "''";
1195                                         $arr [ $firstmultiletterword-1 ] .= "'";
1196                                 }
1197                                 # ... otherwise use the first one that has neither.
1198                                 # (notice that it is possible for all three to be -1 if, for example,
1199                                 # there is only one pentuple-apostrophe in the line)
1200                                 else if ($firstspace > -1)
1201                                 {
1202                                         $arr [ $firstspace ] = "''";
1203                                         $arr [ $firstspace-1 ] .= "'";
1204                                 }
1205                         }
1206
1207                         # Now let's actually convert our apostrophic mush to HTML!
1208                         $output = '';
1209                         $buffer = '';
1210                         $state = '';
1211                         $i = 0;
1212                         foreach ($arr as $r)
1213                         {
1214                                 if (($i % 2) == 0)
1215                                 {
1216                                         if ($state === 'both')
1217                                                 $buffer .= $r;
1218                                         else
1219                                                 $output .= $r;
1220                                 }
1221                                 else
1222                                 {
1223                                         if (strlen ($r) == 2)
1224                                         {
1225                                                 if ($state === 'i')
1226                                                 { $output .= '</i>'; $state = ''; }
1227                                                 else if ($state === 'bi')
1228                                                 { $output .= '</i>'; $state = 'b'; }
1229                                                 else if ($state === 'ib')
1230                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1231                                                 else if ($state === 'both')
1232                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1233                                                 else # $state can be 'b' or ''
1234                                                 { $output .= '<i>'; $state .= 'i'; }
1235                                         }
1236                                         else if (strlen ($r) == 3)
1237                                         {
1238                                                 if ($state === 'b')
1239                                                 { $output .= '</b>'; $state = ''; }
1240                                                 else if ($state === 'bi')
1241                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1242                                                 else if ($state === 'ib')
1243                                                 { $output .= '</b>'; $state = 'i'; }
1244                                                 else if ($state === 'both')
1245                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1246                                                 else # $state can be 'i' or ''
1247                                                 { $output .= '<b>'; $state .= 'b'; }
1248                                         }
1249                                         else if (strlen ($r) == 5)
1250                                         {
1251                                                 if ($state === 'b')
1252                                                 { $output .= '</b><i>'; $state = 'i'; }
1253                                                 else if ($state === 'i')
1254                                                 { $output .= '</i><b>'; $state = 'b'; }
1255                                                 else if ($state === 'bi')
1256                                                 { $output .= '</i></b>'; $state = ''; }
1257                                                 else if ($state === 'ib')
1258                                                 { $output .= '</b></i>'; $state = ''; }
1259                                                 else if ($state === 'both')
1260                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1261                                                 else # ($state == '')
1262                                                 { $buffer = ''; $state = 'both'; }
1263                                         }
1264                                 }
1265                                 $i++;
1266                         }
1267                         # Now close all remaining tags.  Notice that the order is important.
1268                         if ($state === 'b' || $state === 'ib')
1269                                 $output .= '</b>';
1270                         if ($state === 'i' || $state === 'bi' || $state === 'ib')
1271                                 $output .= '</i>';
1272                         if ($state === 'bi')
1273                                 $output .= '</b>';
1274                         # There might be lonely ''''', so make sure we have a buffer
1275                         if ($state === 'both' && $buffer)
1276                                 $output .= '<b><i>'.$buffer.'</i></b>';
1277                         return $output;
1278                 }
1279         }
1280
1281         /**
1282          * Replace external links (REL)
1283          *
1284          * Note: this is all very hackish and the order of execution matters a lot.
1285          * Make sure to run maintenance/parserTests.php if you change this code.
1286          *
1287          * @private
1288          */
1289         function replaceExternalLinks( $text ) {
1290                 global $wgContLang;
1291                 wfProfileIn( __METHOD__ );
1292
1293                 $sk = $this->mOptions->getSkin();
1294
1295                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1296                 $s = array_shift( $bits );
1297
1298                 $i = 0;
1299                 while ( $i<count( $bits ) ) {
1300                         $url = $bits[$i++];
1301                         $protocol = $bits[$i++];
1302                         $text = $bits[$i++];
1303                         $trail = $bits[$i++];
1304
1305                         # The characters '<' and '>' (which were escaped by
1306                         # removeHTMLtags()) should not be included in
1307                         # URLs, per RFC 2396.
1308                         $m2 = array();
1309                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1310                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1311                                 $url = substr($url, 0, $m2[0][1]);
1312                         }
1313
1314                         # If the link text is an image URL, replace it with an <img> tag
1315                         # This happened by accident in the original parser, but some people used it extensively
1316                         $img = $this->maybeMakeExternalImage( $text );
1317                         if ( $img !== false ) {
1318                                 $text = $img;
1319                         }
1320
1321                         $dtrail = '';
1322
1323                         # Set linktype for CSS - if URL==text, link is essentially free
1324                         $linktype = ($text === $url) ? 'free' : 'text';
1325
1326                         # No link text, e.g. [http://domain.tld/some.link]
1327                         if ( $text == '' ) {
1328                                 # Autonumber if allowed. See bug #5918
1329                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1330                                         $langObj = $this->getFunctionLang();
1331                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1332                                         $linktype = 'autonumber';
1333                                 } else {
1334                                         # Otherwise just use the URL
1335                                         $text = htmlspecialchars( $url );
1336                                         $linktype = 'free';
1337                                 }
1338                         } else {
1339                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1340                                 # Check for trail
1341                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1342                         }
1343
1344                         $text = $wgContLang->markNoConversion($text);
1345
1346                         $url = Sanitizer::cleanUrl( $url );
1347
1348                         # Use the encoded URL
1349                         # This means that users can paste URLs directly into the text
1350                         # Funny characters like &ouml; aren't valid in URLs anyway
1351                         # This was changed in August 2004
1352                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1353                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1354
1355                         # Register link in the output object.
1356                         # Replace unnecessary URL escape codes with the referenced character
1357                         # This prevents spammers from hiding links from the filters
1358                         $pasteurized = self::replaceUnusualEscapes( $url );
1359                         $this->mOutput->addExternalLink( $pasteurized );
1360                 }
1361
1362                 wfProfileOut( __METHOD__ );
1363                 return $s;
1364         }
1365
1366         /**
1367          * Get an associative array of additional HTML attributes appropriate for a
1368          * particular external link.  This currently may include rel => nofollow
1369          * (depending on configuration, namespace, and the URL's domain) and/or a
1370          * target attribute (depending on configuration).
1371          *
1372          * @param string $url Optional URL, to extract the domain from for rel =>
1373          *   nofollow if appropriate
1374          * @return array Associative array of HTML attributes
1375          */
1376         function getExternalLinkAttribs( $url = false ) {
1377                 $attribs = array();
1378                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1379                 $ns = $this->mTitle->getNamespace();
1380                 if( $wgNoFollowLinks && !in_array($ns, $wgNoFollowNsExceptions) ) {
1381                         $attribs['rel'] = 'nofollow';
1382
1383                         global $wgNoFollowDomainExceptions;
1384                         if ( $wgNoFollowDomainExceptions ) {
1385                                 $bits = wfParseUrl( $url );
1386                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1387                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1388                                                 if( substr( $bits['host'], -strlen( $domain ) )
1389                                                 == $domain ) {
1390                                                         unset( $attribs['rel'] );
1391                                                         break;
1392                                                 }
1393                                         }
1394                                 }
1395                         }
1396                 }
1397                 if ( $this->mOptions->getExternalLinkTarget() ) {
1398                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1399                 }
1400                 return $attribs;
1401         }
1402
1403
1404         /**
1405          * Replace unusual URL escape codes with their equivalent characters
1406          * @param string
1407          * @return string
1408          * @static
1409          * @todo  This can merge genuinely required bits in the path or query string,
1410          *        breaking legit URLs. A proper fix would treat the various parts of
1411          *        the URL differently; as a workaround, just use the output for
1412          *        statistical records, not for actual linking/output.
1413          */
1414         static function replaceUnusualEscapes( $url ) {
1415                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1416                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1417         }
1418
1419         /**
1420          * Callback function used in replaceUnusualEscapes().
1421          * Replaces unusual URL escape codes with their equivalent character
1422          * @static
1423          * @private
1424          */
1425         private static function replaceUnusualEscapesCallback( $matches ) {
1426                 $char = urldecode( $matches[0] );
1427                 $ord = ord( $char );
1428                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1429                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1430                         // No, shouldn't be escaped
1431                         return $char;
1432                 } else {
1433                         // Yes, leave it escaped
1434                         return $matches[0];
1435                 }
1436         }
1437
1438         /**
1439          * make an image if it's allowed, either through the global
1440          * option, through the exception, or through the on-wiki whitelist
1441          * @private
1442          */
1443         function maybeMakeExternalImage( $url ) {
1444                 $sk = $this->mOptions->getSkin();
1445                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1446                 $imagesexception = !empty($imagesfrom);
1447                 $text = false;
1448                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1449                 if( $imagesexception && is_array( $imagesfrom ) ) {
1450                         $imagematch = false;
1451                         foreach( $imagesfrom as $match ) {
1452                                 if( strpos( $url, $match ) === 0 ) {
1453                                         $imagematch = true;
1454                                         break;
1455                                 }
1456                         }
1457                 } elseif( $imagesexception ) {
1458                         $imagematch = (strpos( $url, $imagesfrom ) === 0);
1459                 } else {
1460                         $imagematch = false;
1461                 }
1462                 if ( $this->mOptions->getAllowExternalImages()
1463                      || ( $imagesexception && $imagematch ) ) {
1464                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1465                                 # Image found
1466                                 $text = $sk->makeExternalImage( $url );
1467                         }
1468                 }
1469                 if( !$text && $this->mOptions->getEnableImageWhitelist()
1470                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1471                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1472                         foreach( $whitelist as $entry ) {
1473                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1474                                 if( strpos( $entry, '#' ) === 0 || $entry === '' )
1475                                         continue;
1476                                 if( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1477                                         # Image matches a whitelist entry
1478                                         $text = $sk->makeExternalImage( $url );
1479                                         break;
1480                                 }
1481                         }
1482                 }
1483                 return $text;
1484         }
1485
1486         /**
1487          * Process [[ ]] wikilinks
1488          * @return processed text
1489          *
1490          * @private
1491          */
1492         function replaceInternalLinks( $s ) {
1493                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1494                 return $s;
1495         }
1496
1497         /**
1498          * Process [[ ]] wikilinks (RIL)
1499          * @return LinkHolderArray
1500          *
1501          * @private
1502          */
1503         function replaceInternalLinks2( &$s ) {
1504                 global $wgContLang;
1505
1506                 wfProfileIn( __METHOD__ );
1507
1508                 wfProfileIn( __METHOD__.'-setup' );
1509                 static $tc = FALSE, $e1, $e1_img;
1510                 # the % is needed to support urlencoded titles as well
1511                 if ( !$tc ) {
1512                         $tc = Title::legalChars() . '#%';
1513                         # Match a link having the form [[namespace:link|alternate]]trail
1514                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1515                         # Match cases where there is no "]]", which might still be images
1516                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1517                 }
1518
1519                 $sk = $this->mOptions->getSkin();
1520                 $holders = new LinkHolderArray( $this );
1521
1522                 #split the entire text string on occurences of [[
1523                 $a = StringUtils::explode( '[[', ' ' . $s );
1524                 #get the first element (all text up to first [[), and remove the space we added
1525                 $s = $a->current();
1526                 $a->next();
1527                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1528                 $s = substr( $s, 1 );
1529
1530                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1531                 $e2 = null;
1532                 if ( $useLinkPrefixExtension ) {
1533                         # Match the end of a line for a word that's not followed by whitespace,
1534                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1535                         $e2 = wfMsgForContent( 'linkprefix' );
1536                 }
1537
1538                 if( is_null( $this->mTitle ) ) {
1539                         wfProfileOut( __METHOD__.'-setup' );
1540                         wfProfileOut( __METHOD__ );
1541                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1542                 }
1543                 $nottalk = !$this->mTitle->isTalkPage();
1544
1545                 if ( $useLinkPrefixExtension ) {
1546                         $m = array();
1547                         if ( preg_match( $e2, $s, $m ) ) {
1548                                 $first_prefix = $m[2];
1549                         } else {
1550                                 $first_prefix = false;
1551                         }
1552                 } else {
1553                         $prefix = '';
1554                 }
1555
1556                 if($wgContLang->hasVariants()) {
1557                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1558                 } else {
1559                         $selflink = array($this->mTitle->getPrefixedText());
1560                 }
1561                 $useSubpages = $this->areSubpagesAllowed();
1562                 wfProfileOut( __METHOD__.'-setup' );
1563
1564                 # Loop for each link
1565                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1566                         # Check for excessive memory usage
1567                         if ( $holders->isBig() ) {
1568                                 # Too big
1569                                 # Do the existence check, replace the link holders and clear the array
1570                                 $holders->replace( $s );
1571                                 $holders->clear();
1572                         }
1573
1574                         if ( $useLinkPrefixExtension ) {
1575                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1576                                 if ( preg_match( $e2, $s, $m ) ) {
1577                                         $prefix = $m[2];
1578                                         $s = $m[1];
1579                                 } else {
1580                                         $prefix='';
1581                                 }
1582                                 # first link
1583                                 if($first_prefix) {
1584                                         $prefix = $first_prefix;
1585                                         $first_prefix = false;
1586                                 }
1587                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1588                         }
1589
1590                         $might_be_img = false;
1591
1592                         wfProfileIn( __METHOD__."-e1" );
1593                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1594                                 $text = $m[2];
1595                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1596                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1597                                 # the real problem is with the $e1 regex
1598                                 # See bug 1300.
1599                                 #
1600                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1601                                 # and no image is in sight. See bug 2095.
1602                                 #
1603                                 if( $text !== '' &&
1604                                         substr( $m[3], 0, 1 ) === ']' &&
1605                                         strpos($text, '[') !== false
1606                                 )
1607                                 {
1608                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1609                                         $m[3] = substr( $m[3], 1 );
1610                                 }
1611                                 # fix up urlencoded title texts
1612                                 if( strpos( $m[1], '%' ) !== false ) {
1613                                         # Should anchors '#' also be rejected?
1614                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1615                                 }
1616                                 $trail = $m[3];
1617                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1618                                 $might_be_img = true;
1619                                 $text = $m[2];
1620                                 if ( strpos( $m[1], '%' ) !== false ) {
1621                                         $m[1] = urldecode($m[1]);
1622                                 }
1623                                 $trail = "";
1624                         } else { # Invalid form; output directly
1625                                 $s .= $prefix . '[[' . $line ;
1626                                 wfProfileOut( __METHOD__."-e1" );
1627                                 continue;
1628                         }
1629                         wfProfileOut( __METHOD__."-e1" );
1630                         wfProfileIn( __METHOD__."-misc" );
1631
1632                         # Don't allow internal links to pages containing
1633                         # PROTO: where PROTO is a valid URL protocol; these
1634                         # should be external links.
1635                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1636                                 $s .= $prefix . '[[' . $line ;
1637                                 wfProfileOut( __METHOD__."-misc" );
1638                                 continue;
1639                         }
1640
1641                         # Make subpage if necessary
1642                         if ( $useSubpages ) {
1643                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1644                         } else {
1645                                 $link = $m[1];
1646                         }
1647
1648                         $noforce = (substr( $m[1], 0, 1 ) !== ':');
1649                         if (!$noforce) {
1650                                 # Strip off leading ':'
1651                                 $link = substr( $link, 1 );
1652                         }
1653
1654                         wfProfileOut( __METHOD__."-misc" );
1655                         wfProfileIn( __METHOD__."-title" );
1656                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1657                         if ( $nt === null ) {
1658                                 $s .= $prefix . '[[' . $line;
1659                                 wfProfileOut( __METHOD__."-title" );
1660                                 continue;
1661                         }
1662
1663                         $ns = $nt->getNamespace();
1664                         $iw = $nt->getInterWiki();
1665                         wfProfileOut( __METHOD__."-title" );
1666
1667                         if ( $might_be_img ) { # if this is actually an invalid link
1668                                 wfProfileIn( __METHOD__."-might_be_img" );
1669                                 if ( $ns == NS_FILE && $noforce ) { #but might be an image
1670                                         $found = false;
1671                                         while ( true ) {
1672                                                 #look at the next 'line' to see if we can close it there
1673                                                 $a->next();
1674                                                 $next_line = $a->current();
1675                                                 if ( $next_line === false || $next_line === null ) {
1676                                                         break;
1677                                                 }
1678                                                 $m = explode( ']]', $next_line, 3 );
1679                                                 if ( count( $m ) == 3 ) {
1680                                                         # the first ]] closes the inner link, the second the image
1681                                                         $found = true;
1682                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1683                                                         $trail = $m[2];
1684                                                         break;
1685                                                 } elseif ( count( $m ) == 2 ) {
1686                                                         #if there's exactly one ]] that's fine, we'll keep looking
1687                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1688                                                 } else {
1689                                                         #if $next_line is invalid too, we need look no further
1690                                                         $text .= '[[' . $next_line;
1691                                                         break;
1692                                                 }
1693                                         }
1694                                         if ( !$found ) {
1695                                                 # we couldn't find the end of this imageLink, so output it raw
1696                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1697                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1698                                                 $s .= "{$prefix}[[$link|$text";
1699                                                 # note: no $trail, because without an end, there *is* no trail
1700                                                 wfProfileOut( __METHOD__."-might_be_img" );
1701                                                 continue;
1702                                         }
1703                                 } else { #it's not an image, so output it raw
1704                                         $s .= "{$prefix}[[$link|$text";
1705                                         # note: no $trail, because without an end, there *is* no trail
1706                                         wfProfileOut( __METHOD__."-might_be_img" );
1707                                         continue;
1708                                 }
1709                                 wfProfileOut( __METHOD__."-might_be_img" );
1710                         }
1711
1712                         $wasblank = ( $text  == '' );
1713                         if ( $wasblank ) $text = $link;
1714
1715                         # Link not escaped by : , create the various objects
1716                         if ( $noforce ) {
1717
1718                                 # Interwikis
1719                                 wfProfileIn( __METHOD__."-interwiki" );
1720                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1721                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1722                                         $s = rtrim($s . $prefix);
1723                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1724                                         wfProfileOut( __METHOD__."-interwiki" );
1725                                         continue;
1726                                 }
1727                                 wfProfileOut( __METHOD__."-interwiki" );
1728
1729                                 if ( $ns == NS_FILE ) {
1730                                         wfProfileIn( __METHOD__."-image" );
1731                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1732                                                 if ( $wasblank ) {
1733                                                         # if no parameters were passed, $text
1734                                                         # becomes something like "File:Foo.png",
1735                                                         # which we don't want to pass on to the
1736                                                         # image generator
1737                                                         $text = '';
1738                                                 } else {
1739                                                         # recursively parse links inside the image caption
1740                                                         # actually, this will parse them in any other parameters, too,
1741                                                         # but it might be hard to fix that, and it doesn't matter ATM
1742                                                         $text = $this->replaceExternalLinks($text);
1743                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1744                                                 }
1745                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1746                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1747                                         }
1748                                         $this->mOutput->addImage( $nt->getDBkey() );
1749                                         wfProfileOut( __METHOD__."-image" );
1750                                         continue;
1751
1752                                 }
1753
1754                                 if ( $ns == NS_CATEGORY ) {
1755                                         wfProfileIn( __METHOD__."-category" );
1756                                         $s = rtrim($s . "\n"); # bug 87
1757
1758                                         if ( $wasblank ) {
1759                                                 $sortkey = $this->getDefaultSort();
1760                                         } else {
1761                                                 $sortkey = $text;
1762                                         }
1763                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1764                                         $sortkey = str_replace( "\n", '', $sortkey );
1765                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1766                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1767
1768                                         /**
1769                                          * Strip the whitespace Category links produce, see bug 87
1770                                          * @todo We might want to use trim($tmp, "\n") here.
1771                                          */
1772                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1773
1774                                         wfProfileOut( __METHOD__."-category" );
1775                                         continue;
1776                                 }
1777                         }
1778
1779                         # Self-link checking
1780                         if( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1781                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1782                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1783                                         continue;
1784                                 }
1785                         }
1786
1787                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1788                         # FIXME: Should do batch file existence checks, see comment below
1789                         if( $ns == NS_MEDIA ) {
1790                                 wfProfileIn( __METHOD__."-media" );
1791                                 # Give extensions a chance to select the file revision for us
1792                                 $skip = $time = false;
1793                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1794                                 if ( $skip ) {
1795                                         $link = $sk->link( $nt );
1796                                 } else {
1797                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1798                                 }
1799                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1800                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1801                                 $this->mOutput->addImage( $nt->getDBkey() );
1802                                 wfProfileOut( __METHOD__."-media" );
1803                                 continue;
1804                         }
1805
1806                         wfProfileIn( __METHOD__."-always_known" );
1807                         # Some titles, such as valid special pages or files in foreign repos, should
1808                         # be shown as bluelinks even though they're not included in the page table
1809                         #
1810                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1811                         # batch file existence checks for NS_FILE and NS_MEDIA
1812                         if( $iw == '' && $nt->isAlwaysKnown() ) {
1813                                 $this->mOutput->addLink( $nt );
1814                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1815                         } else {
1816                                 # Links will be added to the output link list after checking
1817                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1818                         }
1819                         wfProfileOut( __METHOD__."-always_known" );
1820                 }
1821                 wfProfileOut( __METHOD__ );
1822                 return $holders;
1823         }
1824
1825         /**
1826          * Make a link placeholder. The text returned can be later resolved to a real link with
1827          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1828          * parsing of interwiki links, and secondly to allow all existence checks and
1829          * article length checks (for stub links) to be bundled into a single query.
1830          *
1831          * @deprecated
1832          */
1833         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1834                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1835         }
1836
1837         /**
1838          * Render a forced-blue link inline; protect against double expansion of
1839          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1840          * Since this little disaster has to split off the trail text to avoid
1841          * breaking URLs in the following text without breaking trails on the
1842          * wiki links, it's been made into a horrible function.
1843          *
1844          * @param Title $nt
1845          * @param string $text
1846          * @param string $query
1847          * @param string $trail
1848          * @param string $prefix
1849          * @return string HTML-wikitext mix oh yuck
1850          */
1851         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1852                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1853                 $sk = $this->mOptions->getSkin();
1854                 // FIXME: use link() instead of deprecated makeKnownLinkObj()
1855                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1856                 return $this->armorLinks( $link ) . $trail;
1857         }
1858
1859         /**
1860          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1861          * going to go through further parsing steps before inline URL expansion.
1862          *
1863          * Not needed quite as much as it used to be since free links are a bit
1864          * more sensible these days. But bracketed links are still an issue.
1865          *
1866          * @param string more-or-less HTML
1867          * @return string less-or-more HTML with NOPARSE bits
1868          */
1869         function armorLinks( $text ) {
1870                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1871                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1872         }
1873
1874         /**
1875          * Return true if subpage links should be expanded on this page.
1876          * @return bool
1877          */
1878         function areSubpagesAllowed() {
1879                 # Some namespaces don't allow subpages
1880                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1881         }
1882
1883         /**
1884          * Handle link to subpage if necessary
1885          * @param string $target the source of the link
1886          * @param string &$text the link text, modified as necessary
1887          * @return string the full name of the link
1888          * @private
1889          */
1890         function maybeDoSubpageLink($target, &$text) {
1891                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1892         }
1893
1894         /**#@+
1895          * Used by doBlockLevels()
1896          * @private
1897          */
1898         /* private */ function closeParagraph() {
1899                 $result = '';
1900                 if ( $this->mLastSection != '' ) {
1901                         $result = '</' . $this->mLastSection  . ">\n";
1902                 }
1903                 $this->mInPre = false;
1904                 $this->mLastSection = '';
1905                 return $result;
1906         }
1907         # getCommon() returns the length of the longest common substring
1908         # of both arguments, starting at the beginning of both.
1909         #
1910         /* private */ function getCommon( $st1, $st2 ) {
1911                 $fl = strlen( $st1 );
1912                 $shorter = strlen( $st2 );
1913                 if ( $fl < $shorter ) { $shorter = $fl; }
1914
1915                 for ( $i = 0; $i < $shorter; ++$i ) {
1916                         if ( $st1{$i} != $st2{$i} ) { break; }
1917                 }
1918                 return $i;
1919         }
1920         # These next three functions open, continue, and close the list
1921         # element appropriate to the prefix character passed into them.
1922         #
1923         /* private */ function openList( $char ) {
1924                 $result = $this->closeParagraph();
1925
1926                 if ( '*' === $char ) { $result .= '<ul><li>'; }
1927                 elseif ( '#' === $char ) { $result .= '<ol><li>'; }
1928                 elseif ( ':' === $char ) { $result .= '<dl><dd>'; }
1929                 elseif ( ';' === $char ) {
1930                         $result .= '<dl><dt>';
1931                         $this->mDTopen = true;
1932                 }
1933                 else { $result = '<!-- ERR 1 -->'; }
1934
1935                 return $result;
1936         }
1937
1938         /* private */ function nextItem( $char ) {
1939                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
1940                 elseif ( ':' === $char || ';' === $char ) {
1941                         $close = '</dd>';
1942                         if ( $this->mDTopen ) { $close = '</dt>'; }
1943                         if ( ';' === $char ) {
1944                                 $this->mDTopen = true;
1945                                 return $close . '<dt>';
1946                         } else {
1947                                 $this->mDTopen = false;
1948                                 return $close . '<dd>';
1949                         }
1950                 }
1951                 return '<!-- ERR 2 -->';
1952         }
1953
1954         /* private */ function closeList( $char ) {
1955                 if ( '*' === $char ) { $text = '</li></ul>'; }
1956                 elseif ( '#' === $char ) { $text = '</li></ol>'; }
1957                 elseif ( ':' === $char ) {
1958                         if ( $this->mDTopen ) {
1959                                 $this->mDTopen = false;
1960                                 $text = '</dt></dl>';
1961                         } else {
1962                                 $text = '</dd></dl>';
1963                         }
1964                 }
1965                 else {  return '<!-- ERR 3 -->'; }
1966                 return $text."\n";
1967         }
1968         /**#@-*/
1969
1970         /**
1971          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
1972          *
1973          * @param $linestart bool whether or not this is at the start of a line.
1974          * @private
1975          * @return string the lists rendered as HTML
1976          */
1977         function doBlockLevels( $text, $linestart ) {
1978                 wfProfileIn( __METHOD__ );
1979
1980                 # Parsing through the text line by line.  The main thing
1981                 # happening here is handling of block-level elements p, pre,
1982                 # and making lists from lines starting with * # : etc.
1983                 #
1984                 $textLines = StringUtils::explode( "\n", $text );
1985
1986                 $lastPrefix = $output = '';
1987                 $this->mDTopen = $inBlockElem = false;
1988                 $prefixLength = 0;
1989                 $paragraphStack = false;
1990
1991                 foreach ( $textLines as $oLine ) {
1992                         # Fix up $linestart
1993                         if ( !$linestart ) {
1994                                 $output .= $oLine;
1995                                 $linestart = true;
1996                                 continue;
1997                         }
1998                         // * = ul
1999                         // # = ol
2000                         // ; = dt
2001                         // : = dd
2002
2003                         $lastPrefixLength = strlen( $lastPrefix );
2004                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2005                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2006                         // If not in a <pre> element, scan for and figure out what prefixes are there.
2007                         if ( !$this->mInPre ) {
2008                                 # Multiple prefixes may abut each other for nested lists.
2009                                 $prefixLength = strspn( $oLine, '*#:;' );
2010                                 $prefix = substr( $oLine, 0, $prefixLength );
2011
2012                                 # eh?
2013                                 // ; and : are both from definition-lists, so they're equivalent
2014                                 //  for the purposes of determining whether or not we need to open/close
2015                                 //  elements.
2016                                 $prefix2 = str_replace( ';', ':', $prefix );
2017                                 $t = substr( $oLine, $prefixLength );
2018                                 $this->mInPre = (bool)$preOpenMatch;
2019                         } else {
2020                                 # Don't interpret any other prefixes in preformatted text
2021                                 $prefixLength = 0;
2022                                 $prefix = $prefix2 = '';
2023                                 $t = $oLine;
2024                         }
2025
2026                         # List generation
2027                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2028                                 # Same as the last item, so no need to deal with nesting or opening stuff
2029                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2030                                 $paragraphStack = false;
2031
2032                                 if ( substr( $prefix, -1 ) === ';') {
2033                                         # The one nasty exception: definition lists work like this:
2034                                         # ; title : definition text
2035                                         # So we check for : in the remainder text to split up the
2036                                         # title and definition, without b0rking links.
2037                                         $term = $t2 = '';
2038                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2039                                                 $t = $t2;
2040                                                 $output .= $term . $this->nextItem( ':' );
2041                                         }
2042                                 }
2043                         } elseif( $prefixLength || $lastPrefixLength ) {
2044                                 // We need to open or close prefixes, or both.
2045
2046                                 # Either open or close a level...
2047                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2048                                 $paragraphStack = false;
2049
2050                                 // Close all the prefixes which aren't shared.
2051                                 while( $commonPrefixLength < $lastPrefixLength ) {
2052                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2053                                         --$lastPrefixLength;
2054                                 }
2055
2056                                 // Continue the current prefix if appropriate.
2057                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2058                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2059                                 }
2060
2061                                 // Open prefixes where appropriate.
2062                                 while ( $prefixLength > $commonPrefixLength ) {
2063                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2064                                         $output .= $this->openList( $char );
2065
2066                                         if ( ';' === $char ) {
2067                                                 # FIXME: This is dupe of code above
2068                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2069                                                         $t = $t2;
2070                                                         $output .= $term . $this->nextItem( ':' );
2071                                                 }
2072                                         }
2073                                         ++$commonPrefixLength;
2074                                 }
2075                                 $lastPrefix = $prefix2;
2076                         }
2077
2078                         // If we have no prefixes, go to paragraph mode.
2079                         if( 0 == $prefixLength ) {
2080                                 wfProfileIn( __METHOD__."-paragraph" );
2081                                 # No prefix (not in list)--go to paragraph mode
2082                                 // XXX: use a stack for nestable elements like span, table and div
2083                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2084                                 $closematch = preg_match(
2085                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2086                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2087                                 if ( $openmatch or $closematch ) {
2088                                         $paragraphStack = false;
2089                                         # TODO bug 5718: paragraph closed
2090                                         $output .= $this->closeParagraph();
2091                                         if ( $preOpenMatch and !$preCloseMatch ) {
2092                                                 $this->mInPre = true;
2093                                         }
2094                                         if ( $closematch ) {
2095                                                 $inBlockElem = false;
2096                                         } else {
2097                                                 $inBlockElem = true;
2098                                         }
2099                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2100                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2101                                                 // pre
2102                                                 if ($this->mLastSection !== 'pre') {
2103                                                         $paragraphStack = false;
2104                                                         $output .= $this->closeParagraph().'<pre>';
2105                                                         $this->mLastSection = 'pre';
2106                                                 }
2107                                                 $t = substr( $t, 1 );
2108                                         } else {
2109                                                 // paragraph
2110                                                 if ( trim($t) == '' ) {
2111                                                         if ( $paragraphStack ) {
2112                                                                 $output .= $paragraphStack.'<br />';
2113                                                                 $paragraphStack = false;
2114                                                                 $this->mLastSection = 'p';
2115                                                         } else {
2116                                                                 if ($this->mLastSection !== 'p' ) {
2117                                                                         $output .= $this->closeParagraph();
2118                                                                         $this->mLastSection = '';
2119                                                                         $paragraphStack = '<p>';
2120                                                                 } else {
2121                                                                         $paragraphStack = '</p><p>';
2122                                                                 }
2123                                                         }
2124                                                 } else {
2125                                                         if ( $paragraphStack ) {
2126                                                                 $output .= $paragraphStack;
2127                                                                 $paragraphStack = false;
2128                                                                 $this->mLastSection = 'p';
2129                                                         } else if ($this->mLastSection !== 'p') {
2130                                                                 $output .= $this->closeParagraph().'<p>';
2131                                                                 $this->mLastSection = 'p';
2132                                                         }
2133                                                 }
2134                                         }
2135                                 }
2136                                 wfProfileOut( __METHOD__."-paragraph" );
2137                         }
2138                         // somewhere above we forget to get out of pre block (bug 785)
2139                         if($preCloseMatch && $this->mInPre) {
2140                                 $this->mInPre = false;
2141                         }
2142                         if ($paragraphStack === false) {
2143                                 $output .= $t."\n";
2144                         }
2145                 }
2146                 while ( $prefixLength ) {
2147                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2148                         --$prefixLength;
2149                 }
2150                 if ( $this->mLastSection != '' ) {
2151                         $output .= '</' . $this->mLastSection . '>';
2152                         $this->mLastSection = '';
2153                 }
2154
2155                 wfProfileOut( __METHOD__ );
2156                 return $output;
2157         }
2158
2159         /**
2160          * Split up a string on ':', ignoring any occurences inside tags
2161          * to prevent illegal overlapping.
2162          * @param string $str the string to split
2163          * @param string &$before set to everything before the ':'
2164          * @param string &$after set to everything after the ':'
2165          * return string the position of the ':', or false if none found
2166          */
2167         function findColonNoLinks($str, &$before, &$after) {
2168                 wfProfileIn( __METHOD__ );
2169
2170                 $pos = strpos( $str, ':' );
2171                 if( $pos === false ) {
2172                         // Nothing to find!
2173                         wfProfileOut( __METHOD__ );
2174                         return false;
2175                 }
2176
2177                 $lt = strpos( $str, '<' );
2178                 if( $lt === false || $lt > $pos ) {
2179                         // Easy; no tag nesting to worry about
2180                         $before = substr( $str, 0, $pos );
2181                         $after = substr( $str, $pos+1 );
2182                         wfProfileOut( __METHOD__ );
2183                         return $pos;
2184                 }
2185
2186                 // Ugly state machine to walk through avoiding tags.
2187                 $state = self::COLON_STATE_TEXT;
2188                 $stack = 0;
2189                 $len = strlen( $str );
2190                 for( $i = 0; $i < $len; $i++ ) {
2191                         $c = $str{$i};
2192
2193                         switch( $state ) {
2194                         // (Using the number is a performance hack for common cases)
2195                         case 0: // self::COLON_STATE_TEXT:
2196                                 switch( $c ) {
2197                                 case "<":
2198                                         // Could be either a <start> tag or an </end> tag
2199                                         $state = self::COLON_STATE_TAGSTART;
2200                                         break;
2201                                 case ":":
2202                                         if( $stack == 0 ) {
2203                                                 // We found it!
2204                                                 $before = substr( $str, 0, $i );
2205                                                 $after = substr( $str, $i + 1 );
2206                                                 wfProfileOut( __METHOD__ );
2207                                                 return $i;
2208                                         }
2209                                         // Embedded in a tag; don't break it.
2210                                         break;
2211                                 default:
2212                                         // Skip ahead looking for something interesting
2213                                         $colon = strpos( $str, ':', $i );
2214                                         if( $colon === false ) {
2215                                                 // Nothing else interesting
2216                                                 wfProfileOut( __METHOD__ );
2217                                                 return false;
2218                                         }
2219                                         $lt = strpos( $str, '<', $i );
2220                                         if( $stack === 0 ) {
2221                                                 if( $lt === false || $colon < $lt ) {
2222                                                         // We found it!
2223                                                         $before = substr( $str, 0, $colon );
2224                                                         $after = substr( $str, $colon + 1 );
2225                                                         wfProfileOut( __METHOD__ );
2226                                                         return $i;
2227                                                 }
2228                                         }
2229                                         if( $lt === false ) {
2230                                                 // Nothing else interesting to find; abort!
2231                                                 // We're nested, but there's no close tags left. Abort!
2232                                                 break 2;
2233                                         }
2234                                         // Skip ahead to next tag start
2235                                         $i = $lt;
2236                                         $state = self::COLON_STATE_TAGSTART;
2237                                 }
2238                                 break;
2239                         case 1: // self::COLON_STATE_TAG:
2240                                 // In a <tag>
2241                                 switch( $c ) {
2242                                 case ">":
2243                                         $stack++;
2244                                         $state = self::COLON_STATE_TEXT;
2245                                         break;
2246                                 case "/":
2247                                         // Slash may be followed by >?
2248                                         $state = self::COLON_STATE_TAGSLASH;
2249                                         break;
2250                                 default:
2251                                         // ignore
2252                                 }
2253                                 break;
2254                         case 2: // self::COLON_STATE_TAGSTART:
2255                                 switch( $c ) {
2256                                 case "/":
2257                                         $state = self::COLON_STATE_CLOSETAG;
2258                                         break;
2259                                 case "!":
2260                                         $state = self::COLON_STATE_COMMENT;
2261                                         break;
2262                                 case ">":
2263                                         // Illegal early close? This shouldn't happen D:
2264                                         $state = self::COLON_STATE_TEXT;
2265                                         break;
2266                                 default:
2267                                         $state = self::COLON_STATE_TAG;
2268                                 }
2269                                 break;
2270                         case 3: // self::COLON_STATE_CLOSETAG:
2271                                 // In a </tag>
2272                                 if( $c === ">" ) {
2273                                         $stack--;
2274                                         if( $stack < 0 ) {
2275                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2276                                                 wfProfileOut( __METHOD__ );
2277                                                 return false;
2278                                         }
2279                                         $state = self::COLON_STATE_TEXT;
2280                                 }
2281                                 break;
2282                         case self::COLON_STATE_TAGSLASH:
2283                                 if( $c === ">" ) {
2284                                         // Yes, a self-closed tag <blah/>
2285                                         $state = self::COLON_STATE_TEXT;
2286                                 } else {
2287                                         // Probably we're jumping the gun, and this is an attribute
2288                                         $state = self::COLON_STATE_TAG;
2289                                 }
2290                                 break;
2291                         case 5: // self::COLON_STATE_COMMENT:
2292                                 if( $c === "-" ) {
2293                                         $state = self::COLON_STATE_COMMENTDASH;
2294                                 }
2295                                 break;
2296                         case self::COLON_STATE_COMMENTDASH:
2297                                 if( $c === "-" ) {
2298                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2299                                 } else {
2300                                         $state = self::COLON_STATE_COMMENT;
2301                                 }
2302                                 break;
2303                         case self::COLON_STATE_COMMENTDASHDASH:
2304                                 if( $c === ">" ) {
2305                                         $state = self::COLON_STATE_TEXT;
2306                                 } else {
2307                                         $state = self::COLON_STATE_COMMENT;
2308                                 }
2309                                 break;
2310                         default:
2311                                 throw new MWException( "State machine error in " . __METHOD__ );
2312                         }
2313                 }
2314                 if( $stack > 0 ) {
2315                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2316                         return false;
2317                 }
2318                 wfProfileOut( __METHOD__ );
2319                 return false;
2320         }
2321
2322         /**
2323          * Return value of a magic variable (like PAGENAME)
2324          *
2325          * @private
2326          */
2327         function getVariableValue( $index, $frame=false ) {
2328                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2329                 global $wgScriptPath, $wgStylePath;
2330
2331                 /**
2332                  * Some of these require message or data lookups and can be
2333                  * expensive to check many times.
2334                  */
2335                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2336                         if ( isset( $this->mVarCache[$index] ) ) {
2337                                 return $this->mVarCache[$index];
2338                         }
2339                 }
2340
2341                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2342                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2343
2344                 # Use the time zone
2345                 global $wgLocaltimezone;
2346                 if ( isset( $wgLocaltimezone ) ) {
2347                         $oldtz = date_default_timezone_get();
2348                         date_default_timezone_set( $wgLocaltimezone );
2349                 }
2350
2351                 $localTimestamp = date( 'YmdHis', $ts );
2352                 $localMonth = date( 'm', $ts );
2353                 $localMonth1 = date( 'n', $ts );
2354                 $localMonthName = date( 'n', $ts );
2355                 $localDay = date( 'j', $ts );
2356                 $localDay2 = date( 'd', $ts );
2357                 $localDayOfWeek = date( 'w', $ts );
2358                 $localWeek = date( 'W', $ts );
2359                 $localYear = date( 'Y', $ts );
2360                 $localHour = date( 'H', $ts );
2361                 if ( isset( $wgLocaltimezone ) ) {
2362                         date_default_timezone_set( $oldtz );
2363                 }
2364
2365                 switch ( $index ) {
2366                         case 'currentmonth':
2367                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2368                                 break;
2369                         case 'currentmonth1':
2370                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2371                                 break;
2372                         case 'currentmonthname':
2373                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2374                                 break;
2375                         case 'currentmonthnamegen':
2376                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2377                                 break;
2378                         case 'currentmonthabbrev':
2379                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2380                                 break;
2381                         case 'currentday':
2382                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2383                                 break;
2384                         case 'currentday2':
2385                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2386                                 break;
2387                         case 'localmonth':
2388                                 $value = $wgContLang->formatNum( $localMonth );
2389                                 break;
2390                         case 'localmonth1':
2391                                 $value = $wgContLang->formatNum( $localMonth1 );
2392                                 break;
2393                         case 'localmonthname':
2394                                 $value = $wgContLang->getMonthName( $localMonthName );
2395                                 break;
2396                         case 'localmonthnamegen':
2397                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2398                                 break;
2399                         case 'localmonthabbrev':
2400                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2401                                 break;
2402                         case 'localday':
2403                                 $value = $wgContLang->formatNum( $localDay );
2404                                 break;
2405                         case 'localday2':
2406                                 $value = $wgContLang->formatNum( $localDay2 );
2407                                 break;
2408                         case 'pagename':
2409                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2410                                 break;
2411                         case 'pagenamee':
2412                                 $value = $this->mTitle->getPartialURL();
2413                                 break;
2414                         case 'fullpagename':
2415                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2416                                 break;
2417                         case 'fullpagenamee':
2418                                 $value = $this->mTitle->getPrefixedURL();
2419                                 break;
2420                         case 'subpagename':
2421                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2422                                 break;
2423                         case 'subpagenamee':
2424                                 $value = $this->mTitle->getSubpageUrlForm();
2425                                 break;
2426                         case 'basepagename':
2427                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2428                                 break;
2429                         case 'basepagenamee':
2430                                 $value = wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2431                                 break;
2432                         case 'talkpagename':
2433                                 if( $this->mTitle->canTalk() ) {
2434                                         $talkPage = $this->mTitle->getTalkPage();
2435                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2436                                 } else {
2437                                         $value = '';
2438                                 }
2439                                 break;
2440                         case 'talkpagenamee':
2441                                 if( $this->mTitle->canTalk() ) {
2442                                         $talkPage = $this->mTitle->getTalkPage();
2443                                         $value = $talkPage->getPrefixedUrl();
2444                                 } else {
2445                                         $value = '';
2446                                 }
2447                                 break;
2448                         case 'subjectpagename':
2449                                 $subjPage = $this->mTitle->getSubjectPage();
2450                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2451                                 break;
2452                         case 'subjectpagenamee':
2453                                 $subjPage = $this->mTitle->getSubjectPage();
2454                                 $value = $subjPage->getPrefixedUrl();
2455                                 break;
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                                 $value = $this->mRevisionId;
2462                                 break;
2463                         case 'revisionday':
2464                                 // Let the edit saving system know we should parse the page
2465                                 // *after* a revision ID has been assigned. This is for null edits.
2466                                 $this->mOutput->setFlag( 'vary-revision' );
2467                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2468                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2469                                 break;
2470                         case 'revisionday2':
2471                                 // Let the edit saving system know we should parse the page
2472                                 // *after* a revision ID has been assigned. This is for null edits.
2473                                 $this->mOutput->setFlag( 'vary-revision' );
2474                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2475                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2476                                 break;
2477                         case 'revisionmonth':
2478                                 // Let the edit saving system know we should parse the page
2479                                 // *after* a revision ID has been assigned. This is for null edits.
2480                                 $this->mOutput->setFlag( 'vary-revision' );
2481                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2482                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2483                                 break;
2484                         case 'revisionyear':
2485                                 // Let the edit saving system know we should parse the page
2486                                 // *after* a revision ID has been assigned. This is for null edits.
2487                                 $this->mOutput->setFlag( 'vary-revision' );
2488                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2489                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2490                                 break;
2491                         case 'revisiontimestamp':
2492                                 // Let the edit saving system know we should parse the page
2493                                 // *after* a revision ID has been assigned. This is for null edits.
2494                                 $this->mOutput->setFlag( 'vary-revision' );
2495                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2496                                 $value = $this->getRevisionTimestamp();
2497                                 break;
2498                         case 'revisionuser':
2499                                 // Let the edit saving system know we should parse the page
2500                                 // *after* a revision ID has been assigned. This is for null edits.
2501                                 $this->mOutput->setFlag( 'vary-revision' );
2502                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2503                                 $value = $this->getRevisionUser();
2504                                 break;
2505                         case 'namespace':
2506                                 $value = str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2507                                 break;
2508                         case 'namespacee':
2509                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2510                                 break;
2511                         case 'talkspace':
2512                                 $value = $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2513                                 break;
2514                         case 'talkspacee':
2515                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2516                                 break;
2517                         case 'subjectspace':
2518                                 $value = $this->mTitle->getSubjectNsText();
2519                                 break;
2520                         case 'subjectspacee':
2521                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2522                                 break;
2523                         case 'currentdayname':
2524                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2525                                 break;
2526                         case 'currentyear':
2527                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2528                                 break;
2529                         case 'currenttime':
2530                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2531                                 break;
2532                         case 'currenthour':
2533                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2534                                 break;
2535                         case 'currentweek':
2536                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2537                                 // int to remove the padding
2538                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2539                                 break;
2540                         case 'currentdow':
2541                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2542                                 break;
2543                         case 'localdayname':
2544                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2545                                 break;
2546                         case 'localyear':
2547                                 $value = $wgContLang->formatNum( $localYear, true );
2548                                 break;
2549                         case 'localtime':
2550                                 $value = $wgContLang->time( $localTimestamp, false, false );
2551                                 break;
2552                         case 'localhour':
2553                                 $value = $wgContLang->formatNum( $localHour, true );
2554                                 break;
2555                         case 'localweek':
2556                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2557                                 // int to remove the padding
2558                                 $value = $wgContLang->formatNum( (int)$localWeek );
2559                                 break;
2560                         case 'localdow':
2561                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2562                                 break;
2563                         case 'numberofarticles':
2564                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2565                                 break;
2566                         case 'numberoffiles':
2567                                 $value = $wgContLang->formatNum( SiteStats::images() );
2568                                 break;
2569                         case 'numberofusers':
2570                                 $value = $wgContLang->formatNum( SiteStats::users() );
2571                                 break;
2572                         case 'numberofactiveusers':
2573                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2574                                 break;
2575                         case 'numberofpages':
2576                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2577                                 break;
2578                         case 'numberofadmins':
2579                                 $value = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2580                                 break;
2581                         case 'numberofedits':
2582                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2583                                 break;
2584                         case 'numberofviews':
2585                                 $value = $wgContLang->formatNum( SiteStats::views() );
2586                                 break;
2587                         case 'currenttimestamp':
2588                                 $value = wfTimestamp( TS_MW, $ts );
2589                                 break;
2590                         case 'localtimestamp':
2591                                 $value = $localTimestamp;
2592                                 break;
2593                         case 'currentversion':
2594                                 $value = SpecialVersion::getVersion();
2595                                 break;
2596                         case 'sitename':
2597                                 return $wgSitename;
2598                         case 'server':
2599                                 return $wgServer;
2600                         case 'servername':
2601                                 return $wgServerName;
2602                         case 'scriptpath':
2603                                 return $wgScriptPath;
2604                         case 'stylepath':
2605                                 return $wgStylePath;
2606                         case 'directionmark':
2607                                 return $wgContLang->getDirMark();
2608                         case 'contentlanguage':
2609                                 global $wgContLanguageCode;
2610                                 return $wgContLanguageCode;
2611                         default:
2612                                 $ret = null;
2613                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) )
2614                                         return $ret;
2615                                 else
2616                                         return null;
2617                 }
2618
2619                 if ( $index )
2620                         $this->mVarCache[$index] = $value;
2621
2622                 return $value;
2623         }
2624
2625         /**
2626          * initialise the magic variables (like CURRENTMONTHNAME)
2627          *
2628          * @private
2629          */
2630         function initialiseVariables() {
2631                 wfProfileIn( __METHOD__ );
2632                 $variableIDs = MagicWord::getVariableIDs();
2633
2634                 $this->mVariables = new MagicWordArray( $variableIDs );
2635                 wfProfileOut( __METHOD__ );
2636         }
2637
2638         /**
2639          * Preprocess some wikitext and return the document tree.
2640          * This is the ghost of replace_variables().
2641          *
2642          * @param string $text The text to parse
2643          * @param integer flags Bitwise combination of:
2644          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2645          *                                     included. Default is to assume a direct page view.
2646          *
2647          * The generated DOM tree must depend only on the input text and the flags.
2648          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2649          *
2650          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2651          * change in the DOM tree for a given text, must be passed through the section identifier
2652          * in the section edit link and thus back to extractSections().
2653          *
2654          * The output of this function is currently only cached in process memory, but a persistent
2655          * cache may be implemented at a later date which takes further advantage of these strict
2656          * dependency requirements.
2657          *
2658          * @private
2659          */
2660         function preprocessToDom ( $text, $flags = 0 ) {
2661                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2662                 return $dom;
2663         }
2664
2665         /*
2666          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2667          */
2668         public static function splitWhitespace( $s ) {
2669                 $ltrimmed = ltrim( $s );
2670                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2671                 $trimmed = rtrim( $ltrimmed );
2672                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2673                 if ( $diff > 0 ) {
2674                         $w2 = substr( $ltrimmed, -$diff );
2675                 } else {
2676                         $w2 = '';
2677                 }
2678                 return array( $w1, $trimmed, $w2 );
2679         }
2680
2681         /**
2682          * Replace magic variables, templates, and template arguments
2683          * with the appropriate text. Templates are substituted recursively,
2684          * taking care to avoid infinite loops.
2685          *
2686          * Note that the substitution depends on value of $mOutputType:
2687          *  self::OT_WIKI: only {{subst:}} templates
2688          *  self::OT_PREPROCESS: templates but not extension tags
2689          *  self::OT_HTML: all templates and extension tags
2690          *
2691          * @param string $tex The text to transform
2692          * @param PPFrame $frame Object describing the arguments passed to the template.
2693          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2694          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2695          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2696          * @private
2697          */
2698         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2699                 # Is there any text? Also, Prevent too big inclusions!
2700                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2701                         return $text;
2702                 }
2703                 wfProfileIn( __METHOD__ );
2704
2705                 if ( $frame === false ) {
2706                         $frame = $this->getPreprocessor()->newFrame();
2707                 } elseif ( !( $frame instanceof PPFrame ) ) {
2708                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2709                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2710                 }
2711
2712                 $dom = $this->preprocessToDom( $text );
2713                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2714                 $text = $frame->expand( $dom, $flags );
2715
2716                 wfProfileOut( __METHOD__ );
2717                 return $text;
2718         }
2719
2720         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2721         static function createAssocArgs( $args ) {
2722                 $assocArgs = array();
2723                 $index = 1;
2724                 foreach( $args as $arg ) {
2725                         $eqpos = strpos( $arg, '=' );
2726                         if ( $eqpos === false ) {
2727                                 $assocArgs[$index++] = $arg;
2728                         } else {
2729                                 $name = trim( substr( $arg, 0, $eqpos ) );
2730                                 $value = trim( substr( $arg, $eqpos+1 ) );
2731                                 if ( $value === false ) {
2732                                         $value = '';
2733                                 }
2734                                 if ( $name !== false ) {
2735                                         $assocArgs[$name] = $value;
2736                                 }
2737                         }
2738                 }
2739
2740                 return $assocArgs;
2741         }
2742
2743         /**
2744          * Warn the user when a parser limitation is reached
2745          * Will warn at most once the user per limitation type
2746          *
2747          * @param string $limitationType, should be one of:
2748          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2749          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2750          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2751          * @params int $current, $max When an explicit limit has been
2752          *       exceeded, provide the values (optional)
2753          */
2754         function limitationWarn( $limitationType, $current=null, $max=null) {
2755                 //does no harm if $current and $max are present but are unnecessary for the message
2756                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2757                 $this->mOutput->addWarning( $warning );
2758                 $this->addTrackingCategory( "$limitationType-category" );
2759         }
2760
2761         /**
2762          * Return the text of a template, after recursively
2763          * replacing any variables or templates within the template.
2764          *
2765          * @param array $piece The parts of the template
2766          *  $piece['title']: the title, i.e. the part before the |
2767          *  $piece['parts']: the parameter array
2768          *  $piece['lineStart']: whether the brace was at the start of a line
2769          * @param PPFrame The current frame, contains template arguments
2770          * @return string the text of the template
2771          * @private
2772          */
2773         function braceSubstitution( $piece, $frame ) {
2774                 global $wgContLang, $wgNonincludableNamespaces;
2775                 wfProfileIn( __METHOD__ );
2776                 wfProfileIn( __METHOD__.'-setup' );
2777
2778                 # Flags
2779                 $found = false;             # $text has been filled
2780                 $nowiki = false;            # wiki markup in $text should be escaped
2781                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2782                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2783                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2784                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2785
2786                 # Title object, where $text came from
2787                 $title = null;
2788
2789                 # $part1 is the bit before the first |, and must contain only title characters.
2790                 # Various prefixes will be stripped from it later.
2791                 $titleWithSpaces = $frame->expand( $piece['title'] );
2792                 $part1 = trim( $titleWithSpaces );
2793                 $titleText = false;
2794
2795                 # Original title text preserved for various purposes
2796                 $originalTitle = $part1;
2797
2798                 # $args is a list of argument nodes, starting from index 0, not including $part1
2799                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2800                 wfProfileOut( __METHOD__.'-setup' );
2801
2802                 # SUBST
2803                 wfProfileIn( __METHOD__.'-modifiers' );
2804                 if ( !$found ) {
2805                         $mwSubst = MagicWord::get( 'subst' );
2806                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2807                                 # One of two possibilities is true:
2808                                 # 1) Found SUBST but not in the PST phase
2809                                 # 2) Didn't find SUBST and in the PST phase
2810                                 # In either case, return without further processing
2811                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2812                                 $isLocalObj = true;
2813                                 $found = true;
2814                         }
2815                 }
2816
2817                 # Variables
2818                 if ( !$found && $args->getLength() == 0 ) {
2819                         $id = $this->mVariables->matchStartToEnd( $part1 );
2820                         if ( $id !== false ) {
2821                                 $text = $this->getVariableValue( $id, $frame );
2822                                 if (MagicWord::getCacheTTL($id)>-1)
2823                                         $this->mOutput->mContainsOldMagic = true;
2824                                 $found = true;
2825                         }
2826                 }
2827
2828                 # MSG, MSGNW and RAW
2829                 if ( !$found ) {
2830                         # Check for MSGNW:
2831                         $mwMsgnw = MagicWord::get( 'msgnw' );
2832                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2833                                 $nowiki = true;
2834                         } else {
2835                                 # Remove obsolete MSG:
2836                                 $mwMsg = MagicWord::get( 'msg' );
2837                                 $mwMsg->matchStartAndRemove( $part1 );
2838                         }
2839
2840                         # Check for RAW:
2841                         $mwRaw = MagicWord::get( 'raw' );
2842                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2843                                 $forceRawInterwiki = true;
2844                         }
2845                 }
2846                 wfProfileOut( __METHOD__.'-modifiers' );
2847
2848                 # Parser functions
2849                 if ( !$found ) {
2850                         wfProfileIn( __METHOD__ . '-pfunc' );
2851
2852                         $colonPos = strpos( $part1, ':' );
2853                         if ( $colonPos !== false ) {
2854                                 # Case sensitive functions
2855                                 $function = substr( $part1, 0, $colonPos );
2856                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2857                                         $function = $this->mFunctionSynonyms[1][$function];
2858                                 } else {
2859                                         # Case insensitive functions
2860                                         $function = $wgContLang->lc( $function );
2861                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2862                                                 $function = $this->mFunctionSynonyms[0][$function];
2863                                         } else {
2864                                                 $function = false;
2865                                         }
2866                                 }
2867                                 if ( $function ) {
2868                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2869                                         $initialArgs = array( &$this );
2870                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2871                                         if ( $flags & SFH_OBJECT_ARGS ) {
2872                                                 # Add a frame parameter, and pass the arguments as an array
2873                                                 $allArgs = $initialArgs;
2874                                                 $allArgs[] = $frame;
2875                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2876                                                         $funcArgs[] = $args->item( $i );
2877                                                 }
2878                                                 $allArgs[] = $funcArgs;
2879                                         } else {
2880                                                 # Convert arguments to plain text
2881                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2882                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2883                                                 }
2884                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2885                                         }
2886
2887                                         # Workaround for PHP bug 35229 and similar
2888                                         if ( !is_callable( $callback ) ) {
2889                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2890                                                 wfProfileOut( __METHOD__ );
2891                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2892                                         }
2893                                         $result = call_user_func_array( $callback, $allArgs );
2894                                         $found = true;
2895                                         $noparse = true;
2896                                         $preprocessFlags = 0;
2897
2898                                         if ( is_array( $result ) ) {
2899                                                 if ( isset( $result[0] ) ) {
2900                                                         $text = $result[0];
2901                                                         unset( $result[0] );
2902                                                 }
2903
2904                                                 // Extract flags into the local scope
2905                                                 // This allows callers to set flags such as nowiki, found, etc.
2906                                                 extract( $result );
2907                                         } else {
2908                                                 $text = $result;
2909                                         }
2910                                         if ( !$noparse ) {
2911                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2912                                                 $isChildObj = true;
2913                                         }
2914                                 }
2915                         }
2916                         wfProfileOut( __METHOD__ . '-pfunc' );
2917                 }
2918
2919                 # Finish mangling title and then check for loops.
2920                 # Set $title to a Title object and $titleText to the PDBK
2921                 if ( !$found ) {
2922                         $ns = NS_TEMPLATE;
2923                         # Split the title into page and subpage
2924                         $subpage = '';
2925                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2926                         if ($subpage !== '') {
2927                                 $ns = $this->mTitle->getNamespace();
2928                         }
2929                         $title = Title::newFromText( $part1, $ns );
2930                         if ( $title ) {
2931                                 $titleText = $title->getPrefixedText();
2932                                 # Check for language variants if the template is not found
2933                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2934                                         $wgContLang->findVariantLink( $part1, $title, true );
2935                                 }
2936                                 # Do recursion depth check
2937                                 $limit = $this->mOptions->getMaxTemplateDepth();
2938                                 if ( $frame->depth >= $limit ) {
2939                                         $found = true;
2940                                         $text = '<span class="error">' . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit ) . '</span>';
2941                                 }
2942                         }
2943                 }
2944
2945                 # Load from database
2946                 if ( !$found && $title ) {
2947                         wfProfileIn( __METHOD__ . '-loadtpl' );
2948                         if ( !$title->isExternal() ) {
2949                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2950                                         $text = SpecialPage::capturePath( $title );
2951                                         if ( is_string( $text ) ) {
2952                                                 $found = true;
2953                                                 $isHTML = true;
2954                                                 $this->disableCache();
2955                                         }
2956                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2957                                         $found = false; //access denied
2958                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2959                                 } else {
2960                                         list( $text, $title ) = $this->getTemplateDom( $title );
2961                                         if ( $text !== false ) {
2962                                                 $found = true;
2963                                                 $isChildObj = true;
2964                                         }
2965                                 }
2966
2967                                 # If the title is valid but undisplayable, make a link to it
2968                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2969                                         $text = "[[:$titleText]]";
2970                                         $found = true;
2971                                 }
2972                         } elseif ( $title->isTrans() ) {
2973                                 // Interwiki transclusion
2974                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2975                                         $text = $this->interwikiTransclude( $title, 'render' );
2976                                         $isHTML = true;
2977                                 } else {
2978                                         $text = $this->interwikiTransclude( $title, 'raw' );
2979                                         // Preprocess it like a template
2980                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2981                                         $isChildObj = true;
2982                                 }
2983                                 $found = true;
2984                         }
2985
2986                         # Do infinite loop check
2987                         # This has to be done after redirect resolution to avoid infinite loops via redirects
2988                         if ( !$frame->loopCheck( $title ) ) {
2989                                 $found = true;
2990                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
2991                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2992                         }
2993                         wfProfileOut( __METHOD__ . '-loadtpl' );
2994                 }
2995
2996                 # If we haven't found text to substitute by now, we're done
2997                 # Recover the source wikitext and return it
2998                 if ( !$found ) {
2999                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3000                         wfProfileOut( __METHOD__ );
3001                         return array( 'object' => $text );
3002                 }
3003
3004                 # Expand DOM-style return values in a child frame
3005                 if ( $isChildObj ) {
3006                         # Clean up argument array
3007                         $newFrame = $frame->newChild( $args, $title );
3008
3009                         if ( $nowiki ) {
3010                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3011                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3012                                 # Expansion is eligible for the empty-frame cache
3013                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3014                                         $text = $this->mTplExpandCache[$titleText];
3015                                 } else {
3016                                         $text = $newFrame->expand( $text );
3017                                         $this->mTplExpandCache[$titleText] = $text;
3018                                 }
3019                         } else {
3020                                 # Uncached expansion
3021                                 $text = $newFrame->expand( $text );
3022                         }
3023                 }
3024                 if ( $isLocalObj && $nowiki ) {
3025                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3026                         $isLocalObj = false;
3027                 }
3028
3029                 # Replace raw HTML by a placeholder
3030                 # Add a blank line preceding, to prevent it from mucking up
3031                 # immediately preceding headings
3032                 if ( $isHTML ) {
3033                         $text = "\n\n" . $this->insertStripItem( $text );
3034                 }
3035                 # Escape nowiki-style return values
3036                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3037                         $text = wfEscapeWikiText( $text );
3038                 }
3039                 # Bug 529: if the template begins with a table or block-level
3040                 # element, it should be treated as beginning a new line.
3041                 # This behaviour is somewhat controversial.
3042                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3043                         $text = "\n" . $text;
3044                 }
3045
3046                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3047                         # Error, oversize inclusion
3048                         $text = "[[$originalTitle]]" .
3049                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3050                         $this->limitationWarn( 'post-expand-template-inclusion' );
3051                 }
3052
3053                 if ( $isLocalObj ) {
3054                         $ret = array( 'object' => $text );
3055                 } else {
3056                         $ret = array( 'text' => $text );
3057                 }
3058
3059                 wfProfileOut( __METHOD__ );
3060                 return $ret;
3061         }
3062
3063         /**
3064          * Get the semi-parsed DOM representation of a template with a given title,
3065          * and its redirect destination title. Cached.
3066          */
3067         function getTemplateDom( $title ) {
3068                 $cacheTitle = $title;
3069                 $titleText = $title->getPrefixedDBkey();
3070
3071                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3072                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3073                         $title = Title::makeTitle( $ns, $dbk );
3074                         $titleText = $title->getPrefixedDBkey();
3075                 }
3076                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3077                         return array( $this->mTplDomCache[$titleText], $title );
3078                 }
3079
3080                 // Cache miss, go to the database
3081                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3082
3083                 if ( $text === false ) {
3084                         $this->mTplDomCache[$titleText] = false;
3085                         return array( false, $title );
3086                 }
3087
3088                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3089                 $this->mTplDomCache[ $titleText ] = $dom;
3090
3091                 if (! $title->equals($cacheTitle)) {
3092                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3093                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3094                 }
3095
3096                 return array( $dom, $title );
3097         }
3098
3099         /**
3100          * Fetch the unparsed text of a template and register a reference to it.
3101          */
3102         function fetchTemplateAndTitle( $title ) {
3103                 $templateCb = $this->mOptions->getTemplateCallback();
3104                 $stuff = call_user_func( $templateCb, $title, $this );
3105                 $text = $stuff['text'];
3106                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3107                 if ( isset( $stuff['deps'] ) ) {
3108                         foreach ( $stuff['deps'] as $dep ) {
3109                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3110                         }
3111                 }
3112                 return array($text,$finalTitle);
3113         }
3114
3115         function fetchTemplate( $title ) {
3116                 $rv = $this->fetchTemplateAndTitle($title);
3117                 return $rv[0];
3118         }
3119
3120         /**
3121          * Static function to get a template
3122          * Can be overridden via ParserOptions::setTemplateCallback().
3123          */
3124         static function statelessFetchTemplate( $title, $parser=false ) {
3125                 $text = $skip = false;
3126                 $finalTitle = $title;
3127                 $deps = array();
3128
3129                 // Loop to fetch the article, with up to 1 redirect
3130                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3131                         # Give extensions a chance to select the revision instead
3132                         $id = false; // Assume current
3133                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3134
3135                         if( $skip ) {
3136                                 $text = false;
3137                                 $deps[] = array(
3138                                         'title' => $title,
3139                                         'page_id' => $title->getArticleID(),
3140                                         'rev_id' => null );
3141                                 break;
3142                         }
3143                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3144                         $rev_id = $rev ? $rev->getId() : 0;
3145                         // If there is no current revision, there is no page
3146                         if( $id === false && !$rev ) {
3147                                 $linkCache = LinkCache::singleton();
3148                                 $linkCache->addBadLinkObj( $title );
3149                         }
3150
3151                         $deps[] = array(
3152                                 'title' => $title,
3153                                 'page_id' => $title->getArticleID(),
3154                                 'rev_id' => $rev_id );
3155
3156                         if( $rev ) {
3157                                 $text = $rev->getText();
3158                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3159                                 global $wgContLang;
3160                                 $message = $wgContLang->lcfirst( $title->getText() );
3161                                 $text = wfMsgForContentNoTrans( $message );
3162                                 if( wfEmptyMsg( $message, $text ) ) {
3163                                         $text = false;
3164                                         break;
3165                                 }
3166                         } else {
3167                                 break;
3168                         }
3169                         if ( $text === false ) {
3170                                 break;
3171                         }
3172                         // Redirect?
3173                         $finalTitle = $title;
3174                         $title = Title::newFromRedirect( $text );
3175                 }
3176                 return array(
3177                         'text' => $text,
3178                         'finalTitle' => $finalTitle,
3179                         'deps' => $deps );
3180         }
3181
3182         /**
3183          * Transclude an interwiki link.
3184          */
3185         function interwikiTransclude( $title, $action ) {
3186                 global $wgEnableScaryTranscluding;
3187
3188                 if (!$wgEnableScaryTranscluding)
3189                         return wfMsg('scarytranscludedisabled');
3190
3191                 $url = $title->getFullUrl( "action=$action" );
3192
3193                 if (strlen($url) > 255)
3194                         return wfMsg('scarytranscludetoolong');
3195                 return $this->fetchScaryTemplateMaybeFromCache($url);
3196         }
3197
3198         function fetchScaryTemplateMaybeFromCache($url) {
3199                 global $wgTranscludeCacheExpiry;
3200                 $dbr = wfGetDB(DB_SLAVE);
3201                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3202                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3203                                 array('tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3204                 if ($obj) {
3205                         return $obj->tc_contents;
3206                 }
3207
3208                 $text = Http::get($url);
3209                 if (!$text)
3210                         return wfMsg('scarytranscludefailed', $url);
3211
3212                 $dbw = wfGetDB(DB_MASTER);
3213                 $dbw->replace('transcache', array('tc_url'), array(
3214                         'tc_url' => $url,
3215                         'tc_time' => $dbw->timestamp( time() ),
3216                         'tc_contents' => $text));
3217                 return $text;
3218         }
3219
3220
3221         /**
3222          * Triple brace replacement -- used for template arguments
3223          * @private
3224          */
3225         function argSubstitution( $piece, $frame ) {
3226                 wfProfileIn( __METHOD__ );
3227
3228                 $error = false;
3229                 $parts = $piece['parts'];
3230                 $nameWithSpaces = $frame->expand( $piece['title'] );
3231                 $argName = trim( $nameWithSpaces );
3232                 $object = false;
3233                 $text = $frame->getArgument( $argName );
3234                 if (  $text === false && $parts->getLength() > 0
3235                   && (
3236                     $this->ot['html']
3237                     || $this->ot['pre']
3238                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3239                   )
3240                 ) {
3241                         # No match in frame, use the supplied default
3242                         $object = $parts->item( 0 )->getChildren();
3243                 }
3244                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3245                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3246                         $this->limitationWarn( 'post-expand-template-argument' );
3247                 }
3248
3249                 if ( $text === false && $object === false ) {
3250                         # No match anywhere
3251                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3252                 }
3253                 if ( $error !== false ) {
3254                         $text .= $error;
3255                 }
3256                 if ( $object !== false ) {
3257                         $ret = array( 'object' => $object );
3258                 } else {
3259                         $ret = array( 'text' => $text );
3260                 }
3261
3262                 wfProfileOut( __METHOD__ );
3263                 return $ret;
3264         }
3265
3266         /**
3267          * Return the text to be used for a given extension tag.
3268          * This is the ghost of strip().
3269          *
3270          * @param array $params Associative array of parameters:
3271          *     name       PPNode for the tag name
3272          *     attr       PPNode for unparsed text where tag attributes are thought to be
3273          *     attributes Optional associative array of parsed attributes
3274          *     inner      Contents of extension element
3275          *     noClose    Original text did not have a close tag
3276          * @param PPFrame $frame
3277          */
3278         function extensionSubstitution( $params, $frame ) {
3279                 global $wgRawHtml, $wgContLang;
3280
3281                 $name = $frame->expand( $params['name'] );
3282                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3283                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3284
3285                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3286
3287                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3288                         ( $this->ot['html'] || $this->ot['pre'] );
3289                 if ( $this->ot['html'] || $isFunctionTag ) {
3290                         $name = strtolower( $name );
3291                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3292                         if ( isset( $params['attributes'] ) ) {
3293                                 $attributes = $attributes + $params['attributes'];
3294                         }
3295                         switch ( $name ) {
3296                                 case 'html':
3297                                         if( $wgRawHtml ) {
3298                                                 $output = $content;
3299                                                 break;
3300                                         } else {
3301                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3302                                         }
3303                                 case 'nowiki':
3304                                         $content = strtr($content, array('-{' => '-&#123;', '}-' => '&#125;-'));
3305                                         $output = Xml::escapeTagsOnly( $content );
3306                                         break;
3307                                 case 'gallery':
3308                                         $output = $this->renderImageGallery( $content, $attributes );
3309                                         break;
3310                                 case 'a':
3311                                         $output = $this->renderHyperlink( $content, $attributes, $frame );
3312                                         break;
3313                                 case 'math':
3314                                         if ( $this->mOptions->getUseTeX() ) {
3315                                                 $output = $wgContLang->armourMath(
3316                                                         MathRenderer::renderMath( $content, $attributes ) );
3317                                                 break;
3318                                         }
3319                                         /* else let a tag hook handle it (bug 21222) */
3320                                 default:
3321                                         if( isset( $this->mTagHooks[$name] ) ) {
3322                                                 # Workaround for PHP bug 35229 and similar
3323                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3324                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3325                                                 }
3326                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3327                                                         array( $content, $attributes, $this, $frame ) );
3328                                         } elseif( isset( $this->mFunctionTagHooks[$name] ) ) {
3329                                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3330                                                 if( !is_callable( $callback ) )
3331                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3332
3333                                                 $output = call_user_func_array( $callback,
3334                                                         array( &$this, $frame, $content, $attributes ) );
3335                                         } else {
3336                                                 $output = '<span class="error">Invalid tag extension name: ' .
3337                                                         htmlspecialchars( $name ) . '</span>';
3338                                         }
3339                         }
3340                 } else {
3341                         if ( is_null( $attrText ) ) {
3342                                 $attrText = '';
3343                         }
3344                         if ( isset( $params['attributes'] ) ) {
3345                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3346                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3347                                                 htmlspecialchars( $attrValue ) . '"';
3348                                 }
3349                         }
3350                         if ( $content === null ) {
3351                                 $output = "<$name$attrText/>";
3352                         } else {
3353                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3354                                 $output = "<$name$attrText>$content$close";
3355                         }
3356                 }
3357
3358                 if( $isFunctionTag ) {
3359                         return $output;
3360                 } elseif ( $name === 'html' || $name === 'nowiki' ) {
3361                         $this->mStripState->nowiki->setPair( $marker, $output );
3362                 } else {
3363                         $this->mStripState->general->setPair( $marker, $output );
3364                 }
3365                 return $marker;
3366         }
3367
3368         /**
3369          * Increment an include size counter
3370          *
3371          * @param string $type The type of expansion
3372          * @param integer $size The size of the text
3373          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3374          */
3375         function incrementIncludeSize( $type, $size ) {
3376                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3377                         return false;
3378                 } else {
3379                         $this->mIncludeSizes[$type] += $size;
3380                         return true;
3381                 }
3382         }
3383
3384         /**
3385          * Increment the expensive function count
3386          *
3387          * @return boolean False if the limit has been exceeded
3388          */
3389         function incrementExpensiveFunctionCount() {
3390                 global $wgExpensiveParserFunctionLimit;
3391                 $this->mExpensiveFunctionCount++;
3392                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3393                         return true;
3394                 }
3395                 return false;
3396         }
3397
3398         /**
3399          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3400          * Fills $this->mDoubleUnderscores, returns the modified text
3401          */
3402         function doDoubleUnderscore( $text ) {
3403                 global $wgDisableLangConversion;
3404                 wfProfileIn( __METHOD__ );
3405
3406                 // The position of __TOC__ needs to be recorded
3407                 $mw = MagicWord::get( 'toc' );
3408                 if( $mw->match( $text ) ) {
3409                         $this->mShowToc = true;
3410                         $this->mForceTocPosition = true;
3411
3412                         // Set a placeholder. At the end we'll fill it in with the TOC.
3413                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3414
3415                         // Only keep the first one.
3416                         $text = $mw->replace( '', $text );
3417                 }
3418
3419                 // Now match and remove the rest of them
3420                 $mwa = MagicWord::getDoubleUnderscoreArray();
3421                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3422
3423                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3424                         $this->mOutput->mNoGallery = true;
3425                 }
3426                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3427                         $this->mShowToc = false;
3428                 }
3429                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3430                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3431                         $this->addTrackingCategory( 'hidden-category-category' );
3432                 }
3433                 # (bug 8068) Allow control over whether robots index a page.
3434                 #
3435                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3436                 # is not desirable, the last one on the page should win.
3437                 if( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3438                         $this->mOutput->setIndexPolicy( 'noindex' );
3439                         $this->addTrackingCategory( 'noindex-category' );
3440                 }
3441                 if( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ){
3442                         $this->mOutput->setIndexPolicy( 'index' );
3443                         $this->addTrackingCategory( 'index-category' );
3444                 }
3445
3446                 if ( !$wgDisableLangConversion ) {
3447                         if( isset( $this->mDoubleUnderscores['notitleconvert'] ) ){
3448                                 $this->mDoTitleConvert = false;
3449                         }
3450
3451                         // Don't convert talk pages
3452                         if( isset( $this->mDoubleUnderscores['nocontentconvert'] )
3453                                 && !$this->mTitle->isTalkPage() ){
3454                                 $this->mDoContentConvert = false;
3455                         }
3456                 }
3457
3458                 wfProfileOut( __METHOD__ );
3459                 return $text;
3460         }
3461
3462         /**
3463          * Add a tracking category, getting the title from a system message,
3464          * or print a debug message if the title is invalid.
3465          * @param $msg String message key
3466          * @return Bool whether the addition was successful
3467          */
3468         protected function addTrackingCategory( $msg ){
3469                 $cat = wfMsgForContent( $msg );
3470
3471                 # Allow tracking categories to be disabled by setting them to "-"
3472                 if( $cat === '-' ) return false;
3473
3474                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3475                 if ( $containerCategory ) {
3476                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3477                         return true;
3478                 } else {
3479                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3480                         return false;
3481                 }
3482         }
3483
3484         /**
3485          * This function accomplishes several tasks:
3486          * 1) Auto-number headings if that option is enabled
3487          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3488          * 3) Add a Table of contents on the top for users who have enabled the option
3489          * 4) Auto-anchor headings
3490          *
3491          * It loops through all headlines, collects the necessary data, then splits up the
3492          * string and re-inserts the newly formatted headlines.
3493          *
3494          * @param string $text
3495          * @param string $origText Original, untouched wikitext
3496          * @param boolean $isMain
3497          * @private
3498          */
3499         function formatHeadings( $text, $origText, $isMain=true ) {
3500                 global $wgMaxTocLevel, $wgContLang, $wgEnforceHtmlIds;
3501
3502                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3503                 $showEditLink = $this->mOptions->getEditSection();
3504
3505                 // Do not call quickUserCan unless necessary
3506                 if( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3507                         $showEditLink = 0;
3508                 }
3509
3510                 # Inhibit editsection links if requested in the page
3511                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3512                         $showEditLink = 0;
3513                 }
3514
3515                 # Get all headlines for numbering them and adding funky stuff like [edit]
3516                 # links - this is for later, but we need the number of headlines right now
3517                 $matches = array();
3518                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3519
3520                 # if there are fewer than 4 headlines in the article, do not show TOC
3521                 # unless it's been explicitly enabled.
3522                 $enoughToc = $this->mShowToc &&
3523                         (($numMatches >= 4) || $this->mForceTocPosition);
3524
3525                 # Allow user to stipulate that a page should have a "new section"
3526                 # link added via __NEWSECTIONLINK__
3527                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3528                         $this->mOutput->setNewSection( true );
3529                 }
3530
3531                 # Allow user to remove the "new section"
3532                 # link via __NONEWSECTIONLINK__
3533                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3534                         $this->mOutput->hideNewSection( true );
3535                 }
3536
3537                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3538                 # override above conditions and always show TOC above first header
3539                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3540                         $this->mShowToc = true;
3541                         $enoughToc = true;
3542                 }
3543
3544                 # We need this to perform operations on the HTML
3545                 $sk = $this->mOptions->getSkin();
3546
3547                 # headline counter
3548                 $headlineCount = 0;
3549                 $numVisible = 0;
3550
3551                 # Ugh .. the TOC should have neat indentation levels which can be
3552                 # passed to the skin functions. These are determined here
3553                 $toc = '';
3554                 $full = '';
3555                 $head = array();
3556                 $sublevelCount = array();
3557                 $levelCount = array();
3558                 $toclevel = 0;
3559                 $level = 0;
3560                 $prevlevel = 0;
3561                 $toclevel = 0;
3562                 $prevtoclevel = 0;
3563                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3564                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3565                 $oldType = $this->mOutputType;
3566                 $this->setOutputType( self::OT_WIKI );
3567                 $frame = $this->getPreprocessor()->newFrame();
3568                 $root = $this->preprocessToDom( $origText );
3569                 $node = $root->getFirstChild();
3570                 $byteOffset = 0;
3571                 $tocraw = array();
3572
3573                 foreach( $matches[3] as $headline ) {
3574                         $isTemplate = false;
3575                         $titleText = false;
3576                         $sectionIndex = false;
3577                         $numbering = '';
3578                         $markerMatches = array();
3579                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3580                                 $serial = $markerMatches[1];
3581                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3582                                 $isTemplate = ($titleText != $baseTitleText);
3583                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3584                         }
3585
3586                         if( $toclevel ) {
3587                                 $prevlevel = $level;
3588                                 $prevtoclevel = $toclevel;
3589                         }
3590                         $level = $matches[1][$headlineCount];
3591
3592                         if ( $level > $prevlevel ) {
3593                                 # Increase TOC level
3594                                 $toclevel++;
3595                                 $sublevelCount[$toclevel] = 0;
3596                                 if( $toclevel<$wgMaxTocLevel ) {
3597                                         $prevtoclevel = $toclevel;
3598                                         $toc .= $sk->tocIndent();
3599                                         $numVisible++;
3600                                 }
3601                         }
3602                         elseif ( $level < $prevlevel && $toclevel > 1 ) {
3603                                 # Decrease TOC level, find level to jump to
3604
3605                                 for ($i = $toclevel; $i > 0; $i--) {
3606                                         if ( $levelCount[$i] == $level ) {
3607                                                 # Found last matching level
3608                                                 $toclevel = $i;
3609                                                 break;
3610                                         }
3611                                         elseif ( $levelCount[$i] < $level ) {
3612                                                 # Found first matching level below current level
3613                                                 $toclevel = $i + 1;
3614                                                 break;
3615                                         }
3616                                 }
3617                                 if( $i == 0 ) $toclevel = 1;
3618                                 if( $toclevel<$wgMaxTocLevel ) {
3619                                         if($prevtoclevel < $wgMaxTocLevel) {
3620                                                 # Unindent only if the previous toc level was shown :p
3621                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3622                                                 $prevtoclevel = $toclevel;
3623                                         } else {
3624                                                 $toc .= $sk->tocLineEnd();
3625                                         }
3626                                 }
3627                         }
3628                         else {
3629                                 # No change in level, end TOC line
3630                                 if( $toclevel<$wgMaxTocLevel ) {
3631                                         $toc .= $sk->tocLineEnd();
3632                                 }
3633                         }
3634
3635                         $levelCount[$toclevel] = $level;
3636
3637                         # count number of headlines for each level
3638                         @$sublevelCount[$toclevel]++;
3639                         $dot = 0;
3640                         for( $i = 1; $i <= $toclevel; $i++ ) {
3641                                 if( !empty( $sublevelCount[$i] ) ) {
3642                                         if( $dot ) {
3643                                                 $numbering .= '.';
3644                                         }
3645                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3646                                         $dot = 1;
3647                                 }
3648                         }
3649
3650                         # The safe header is a version of the header text safe to use for links
3651                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3652                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3653
3654                         # Remove link placeholders by the link text.
3655                         #     <!--LINK number-->
3656                         # turns into
3657                         #     link text with suffix
3658                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3659
3660                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3661                         $tocline = preg_replace(
3662                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3663                                 array( '',                          '<$1>'),
3664                                 $safeHeadline
3665                         );
3666                         $tocline = trim( $tocline );
3667
3668                         # For the anchor, strip out HTML-y stuff period
3669                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3670                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3671                         $safeHeadline = trim( $safeHeadline );
3672
3673                         # Save headline for section edit hint before it's escaped
3674                         $headlineHint = $safeHeadline;
3675
3676                         if ( $wgEnforceHtmlIds ) {
3677                                 $legacyHeadline = false;
3678                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3679                                         'noninitial' );
3680                         } else {
3681                                 # For reverse compatibility, provide an id that's
3682                                 # HTML4-compatible, like we used to.
3683                                 #
3684                                 # It may be worth noting, academically, that it's possible for
3685                                 # the legacy anchor to conflict with a non-legacy headline
3686                                 # anchor on the page.  In this case likely the "correct" thing
3687                                 # would be to either drop the legacy anchors or make sure
3688                                 # they're numbered first.  However, this would require people
3689                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3690                                 # manually, so let's not bother worrying about it.
3691                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3692                                         'noninitial' );
3693                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline, 'xml' );
3694
3695                                 if ( $legacyHeadline == $safeHeadline ) {
3696                                         # No reason to have both (in fact, we can't)
3697                                         $legacyHeadline = false;
3698                                 } elseif ( $legacyHeadline != Sanitizer::escapeId(
3699                                 $legacyHeadline, 'xml' ) ) {
3700                                         # The legacy id is invalid XML.  We used to allow this, but
3701                                         # there's no reason to do so anymore.  Backward
3702                                         # compatibility will fail slightly in this case, but it's
3703                                         # no big deal.
3704                                         $legacyHeadline = false;
3705                                 }
3706                         }
3707
3708                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3709                         # Does this apply to Unicode characters?  Because we aren't
3710                         # handling those here.
3711                         $arrayKey = strtolower( $safeHeadline );
3712                         if ( $legacyHeadline === false ) {
3713                                 $legacyArrayKey = false;
3714                         } else {
3715                                 $legacyArrayKey = strtolower( $legacyHeadline );
3716                         }
3717
3718                         # count how many in assoc. array so we can track dupes in anchors
3719                         if ( isset( $refers[$arrayKey] ) ) {
3720                                 $refers[$arrayKey]++;
3721                         } else {
3722                                 $refers[$arrayKey] = 1;
3723                         }
3724                         if ( isset( $refers[$legacyArrayKey] ) ) {
3725                                 $refers[$legacyArrayKey]++;
3726                         } else {
3727                                 $refers[$legacyArrayKey] = 1;
3728                         }
3729
3730                         # Don't number the heading if it is the only one (looks silly)
3731                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3732                                 # the two are different if the line contains a link
3733                                 $headline=$numbering . ' ' . $headline;
3734                         }
3735
3736                         # Create the anchor for linking from the TOC to the section
3737                         $anchor = $safeHeadline;
3738                         $legacyAnchor = $legacyHeadline;
3739                         if ( $refers[$arrayKey] > 1 ) {
3740                                 $anchor .= '_' . $refers[$arrayKey];
3741                         }
3742                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3743                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3744                         }
3745                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3746                                 $toc .= $sk->tocLine($anchor, $tocline,
3747                                         $numbering, $toclevel, ($isTemplate ? false : $sectionIndex));
3748                         }
3749
3750                         # Add the section to the section tree
3751                         # Find the DOM node for this header
3752                         while ( $node && !$isTemplate ) {
3753                                 if ( $node->getName() === 'h' ) {
3754                                         $bits = $node->splitHeading();
3755                                         if ( $bits['i'] == $sectionIndex )
3756                                                 break;
3757                                 }
3758                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3759                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3760                                 $node = $node->getNextSibling();
3761                         }
3762                         $tocraw[] = array(
3763                                 'toclevel' => $toclevel,
3764                                 'level' => $level,
3765                                 'line' => $tocline,
3766                                 'number' => $numbering,
3767                                 'index' => ($isTemplate ? 'T-' : '' ) . $sectionIndex,
3768                                 'fromtitle' => $titleText,
3769                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3770                                 'anchor' => $anchor,
3771                         );
3772
3773                         # give headline the correct <h#> tag
3774                         if( $showEditLink && $sectionIndex !== false ) {
3775                                 if( $isTemplate ) {
3776                                         # Put a T flag in the section identifier, to indicate to extractSections()
3777                                         # that sections inside <includeonly> should be counted.
3778                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3779                                 } else {
3780                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3781                                 }
3782                         } else {
3783                                 $editlink = '';
3784                         }
3785                         $head[$headlineCount] = $sk->makeHeadline( $level,
3786                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3787                                 $editlink, $legacyAnchor );
3788
3789                         $headlineCount++;
3790                 }
3791
3792                 $this->setOutputType( $oldType );
3793
3794                 # Never ever show TOC if no headers
3795                 if( $numVisible < 1 ) {
3796                         $enoughToc = false;
3797                 }
3798
3799                 if( $enoughToc ) {
3800                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3801                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3802                         }
3803                         $toc = $sk->tocList( $toc );
3804                         $this->mOutput->setTOCHTML( $toc );
3805                 }
3806
3807                 if ( $isMain ) {
3808                         $this->mOutput->setSections( $tocraw );
3809                 }
3810
3811                 # split up and insert constructed headlines
3812
3813                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3814                 $i = 0;
3815
3816                 foreach( $blocks as $block ) {
3817                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3818                                 # This is the [edit] link that appears for the top block of text when
3819                                 # section editing is enabled
3820
3821                                 # Disabled because it broke block formatting
3822                                 # For example, a bullet point in the top line
3823                                 # $full .= $sk->editSectionLink(0);
3824                         }
3825                         $full .= $block;
3826                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3827                                 # Top anchor now in skin
3828                                 $full = $full.$toc;
3829                         }
3830
3831                         if( !empty( $head[$i] ) ) {
3832                                 $full .= $head[$i];
3833                         }
3834                         $i++;
3835                 }
3836                 if( $this->mForceTocPosition ) {
3837                         return str_replace( '<!--MWTOC-->', $toc, $full );
3838                 } else {
3839                         return $full;
3840                 }
3841         }
3842
3843         /**
3844          * Merge $tree2 into $tree1 by replacing the section with index
3845          * $section in $tree1 and its descendants with the sections in $tree2.
3846          * Note that in the returned section tree, only the 'index' and
3847          * 'byteoffset' fields are guaranteed to be correct.
3848          * @param $tree1 array Section tree from ParserOutput::getSectons()
3849         *  @param $tree2 array Section tree
3850          * @param $section int Section index
3851          * @param $title Title Title both section trees come from
3852          * @param $len2 int Length of the original wikitext for $tree2
3853          * @return array Merged section tree
3854          */
3855         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3856                 global $wgContLang;
3857                 $newTree = array();
3858                 $targetLevel = false;
3859                 $merged = false;
3860                 $lastLevel = 1;
3861                 $nextIndex = 1;
3862                 $numbering = array( 0 );
3863                 $titletext = $title->getPrefixedDBkey();
3864                 foreach ( $tree1 as $s ) {
3865                         if ( $targetLevel !== false ) {
3866                                 if ( $s['level'] <= $targetLevel )
3867                                         // We've skipped enough
3868                                         $targetLevel = false;
3869                                 else
3870                                         continue;
3871                         }
3872                         if ( $s['index'] != $section ||
3873                                         $s['fromtitle'] != $titletext ) {
3874                                 self::incrementNumbering( $numbering,
3875                                         $s['toclevel'], $lastLevel );
3876
3877                                 // Rewrite index, byteoffset and number
3878                                 if ( $s['fromtitle'] == $titletext ) {
3879                                         $s['index'] = $nextIndex++;
3880                                         if ( $merged )
3881                                                 $s['byteoffset'] += $len2;
3882                                 }
3883                                 $s['number']  = implode( '.', array_map(
3884                                         array( $wgContLang, 'formatnum' ),
3885                                         $numbering ) );
3886                                 $lastLevel = $s['toclevel'];
3887                                 $newTree[] = $s;
3888                         } else {
3889                                 // We're at $section
3890                                 // Insert sections from $tree2 here
3891                                 foreach ( $tree2 as $s2 ) {
3892                                         // Rewrite the fields in $s2
3893                                         // before inserting it
3894                                         $s2['toclevel'] += $s['toclevel'] - 1;
3895                                         $s2['level'] += $s['level'] - 1;
3896                                         $s2['index'] = $nextIndex++;
3897                                         $s2['byteoffset'] += $s['byteoffset'];
3898
3899                                         self::incrementNumbering( $numbering,
3900                                                 $s2['toclevel'], $lastLevel );
3901                                         $s2['number']  = implode( '.', array_map(
3902                                                 array( $wgContLang, 'formatnum' ),
3903                                                 $numbering ) );
3904                                         $lastLevel = $s2['toclevel'];
3905                                         $newTree[] = $s2;
3906                                 }
3907                                 // Skip all descendants of $section in $tree1
3908                                 $targetLevel = $s['level'];
3909                                 $merged = true;
3910                         }
3911                 }
3912                 return $newTree;
3913         }
3914
3915         /**
3916          * Increment a section number. Helper function for mergeSectionTrees()
3917          * @param $number array Array representing a section number
3918          * @param $level int Current TOC level (depth)
3919          * @param $lastLevel int Level of previous TOC entry
3920          */
3921         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3922                 if ( $level > $lastLevel )
3923                         $number[$level - 1] = 1;
3924                 else if ( $level < $lastLevel ) {
3925                         foreach ( $number as $key => $unused )
3926                                 if ( $key >= $level )
3927                                         unset( $number[$key] );
3928                         $number[$level - 1]++;
3929                 } else
3930                         $number[$level - 1]++;
3931         }
3932
3933         /**
3934          * Transform wiki markup when saving a page by doing \r\n -> \n
3935          * conversion, substitting signatures, {{subst:}} templates, etc.
3936          *
3937          * @param string $text the text to transform
3938          * @param Title &$title the Title object for the current article
3939          * @param User $user the User object describing the current user
3940          * @param ParserOptions $options parsing options
3941          * @param bool $clearState whether to clear the parser state first
3942          * @return string the altered wiki markup
3943          * @public
3944          */
3945         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
3946                 $this->mOptions = $options;
3947                 $this->setTitle( $title );
3948                 $this->setOutputType( self::OT_WIKI );
3949
3950                 if ( $clearState ) {
3951                         $this->clearState();
3952                 }
3953
3954                 $pairs = array(
3955                         "\r\n" => "\n",
3956                 );
3957                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3958                 $text = $this->pstPass2( $text, $user );
3959                 $text = $this->mStripState->unstripBoth( $text );
3960                 return $text;
3961         }
3962
3963         /**
3964          * Pre-save transform helper function
3965          * @private
3966          */
3967         function pstPass2( $text, $user ) {
3968                 global $wgContLang, $wgLocaltimezone;
3969
3970                 /* Note: This is the timestamp saved as hardcoded wikitext to
3971                  * the database, we use $wgContLang here in order to give
3972                  * everyone the same signature and use the default one rather
3973                  * than the one selected in each user's preferences.
3974                  *
3975                  * (see also bug 12815)
3976                  */
3977                 $ts = $this->mOptions->getTimestamp();
3978                 if ( isset( $wgLocaltimezone ) ) {
3979                         $tz = $wgLocaltimezone;
3980                 } else {
3981                         $tz = date_default_timezone_get();
3982                 }
3983
3984                 $unixts = wfTimestamp( TS_UNIX, $ts );
3985                 $oldtz = date_default_timezone_get();
3986                 date_default_timezone_set( $tz );
3987                 $ts = date( 'YmdHis', $unixts );
3988                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
3989
3990                 /* Allow translation of timezones trough wiki. date() can return
3991                  * whatever crap the system uses, localised or not, so we cannot
3992                  * ship premade translations.
3993                  */
3994                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
3995                 $value = wfMsgForContent( $key );
3996                 if ( !wfEmptyMsg( $key, $value ) ) $tzMsg = $value;
3997
3998                 date_default_timezone_set( $oldtz );
3999
4000                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4001
4002                 # Variable replacement
4003                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4004                 $text = $this->replaceVariables( $text );
4005
4006                 # Signatures
4007                 $sigText = $this->getUserSig( $user );
4008                 $text = strtr( $text, array(
4009                         '~~~~~' => $d,
4010                         '~~~~' => "$sigText $d",
4011                         '~~~' => $sigText
4012                 ) );
4013
4014                 # Context links: [[|name]] and [[name (context)|]]
4015                 #
4016                 global $wgLegalTitleChars;
4017                 $tc = "[$wgLegalTitleChars]";
4018                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4019
4020                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
4021                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
4022                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4023                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4024
4025                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4026                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4027                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4028                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4029
4030                 $t = $this->mTitle->getText();
4031                 $m = array();
4032                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4033                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4034                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4035                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4036                 } else {
4037                         # if there's no context, don't bother duplicating the title
4038                         $text = preg_replace( $p2, '[[\\1]]', $text );
4039                 }
4040
4041                 # Trim trailing whitespace
4042                 $text = rtrim( $text );
4043
4044                 return $text;
4045         }
4046
4047         /**
4048          * Fetch the user's signature text, if any, and normalize to
4049          * validated, ready-to-insert wikitext.
4050          * If you have pre-fetched the nickname or the fancySig option, you can
4051          * specify them here to save a database query.
4052          *
4053          * @param User $user
4054          * @return string
4055          */
4056         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4057                 global $wgMaxSigChars;
4058
4059                 $username = $user->getName();
4060
4061                 // If not given, retrieve from the user object.
4062                 if ( $nickname === false )
4063                         $nickname = $user->getOption( 'nickname' );
4064
4065                 if ( is_null( $fancySig ) )
4066                         $fancySig = $user->getBoolOption( 'fancysig' );
4067
4068                 $nickname = $nickname == null ? $username : $nickname;
4069
4070                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4071                         $nickname = $username;
4072                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4073                 } elseif( $fancySig !== false ) {
4074                         # Sig. might contain markup; validate this
4075                         if( $this->validateSig( $nickname ) !== false ) {
4076                                 # Validated; clean up (if needed) and return it
4077                                 return $this->cleanSig( $nickname, true );
4078                         } else {
4079                                 # Failed to validate; fall back to the default
4080                                 $nickname = $username;
4081                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4082                         }
4083                 }
4084
4085                 // Make sure nickname doesnt get a sig in a sig
4086                 $nickname = $this->cleanSigInSig( $nickname );
4087
4088                 # If we're still here, make it a link to the user page
4089                 $userText = wfEscapeWikiText( $username );
4090                 $nickText = wfEscapeWikiText( $nickname );
4091                 if ( $user->isAnon() )  {
4092                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4093                 } else {
4094                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4095                 }
4096         }
4097
4098         /**
4099          * Check that the user's signature contains no bad XML
4100          *
4101          * @param string $text
4102          * @return mixed An expanded string, or false if invalid.
4103          */
4104         function validateSig( $text ) {
4105                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4106         }
4107
4108         /**
4109          * Clean up signature text
4110          *
4111          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4112          * 2) Substitute all transclusions
4113          *
4114          * @param string $text
4115          * @param $parsing Whether we're cleaning (preferences save) or parsing
4116          * @return string Signature text
4117          */
4118         function cleanSig( $text, $parsing = false ) {
4119                 if ( !$parsing ) {
4120                         global $wgTitle;
4121                         $this->clearState();
4122                         $this->setTitle( $wgTitle );
4123                         $this->mOptions = new ParserOptions;
4124                         $this->setOutputType = self::OT_PREPROCESS;
4125                 }
4126
4127                 # Option to disable this feature
4128                 if ( !$this->mOptions->getCleanSignatures() ) {
4129                         return $text;
4130                 }
4131
4132                 # FIXME: regex doesn't respect extension tags or nowiki
4133                 #  => Move this logic to braceSubstitution()
4134                 $substWord = MagicWord::get( 'subst' );
4135                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4136                 $substText = '{{' . $substWord->getSynonym( 0 );
4137
4138                 $text = preg_replace( $substRegex, $substText, $text );
4139                 $text = $this->cleanSigInSig( $text );
4140                 $dom = $this->preprocessToDom( $text );
4141                 $frame = $this->getPreprocessor()->newFrame();
4142                 $text = $frame->expand( $dom );
4143
4144                 if ( !$parsing ) {
4145                         $text = $this->mStripState->unstripBoth( $text );
4146                 }
4147
4148                 return $text;
4149         }
4150
4151         /**
4152          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4153          * @param string $text
4154          * @return string Signature text with /~{3,5}/ removed
4155          */
4156         function cleanSigInSig( $text ) {
4157                 $text = preg_replace( '/~{3,5}/', '', $text );
4158                 return $text;
4159         }
4160
4161         /**
4162          * Set up some variables which are usually set up in parse()
4163          * so that an external function can call some class members with confidence
4164          * @public
4165          */
4166         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4167                 $this->setTitle( $title );
4168                 $this->mOptions = $options;
4169                 $this->setOutputType( $outputType );
4170                 if ( $clearState ) {
4171                         $this->clearState();
4172                 }
4173         }
4174
4175         /**
4176          * Wrapper for preprocess()
4177          *
4178          * @param string $text the text to preprocess
4179          * @param ParserOptions $options  options
4180          * @return string
4181          * @public
4182          */
4183         function transformMsg( $text, $options ) {
4184                 global $wgTitle;
4185                 static $executing = false;
4186
4187                 # Guard against infinite recursion
4188                 if ( $executing ) {
4189                         return $text;
4190                 }
4191                 $executing = true;
4192
4193                 wfProfileIn(__METHOD__);
4194                 $text = $this->preprocess( $text, $wgTitle, $options );
4195
4196                 $executing = false;
4197                 wfProfileOut(__METHOD__);
4198                 return $text;
4199         }
4200
4201         /**
4202          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4203          * The callback should have the following form:
4204          *    function myParserHook( $text, $params, &$parser ) { ... }
4205          *
4206          * Transform and return $text. Use $parser for any required context, e.g. use
4207          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4208          *
4209          * @public
4210          *
4211          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4212          * @param mixed $callback The callback function (and object) to use for the tag
4213          *
4214          * @return The old value of the mTagHooks array associated with the hook
4215          */
4216         function setHook( $tag, $callback ) {
4217                 $tag = strtolower( $tag );
4218                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4219                 $this->mTagHooks[$tag] = $callback;
4220                 if( !in_array( $tag, $this->mStripList ) ) {
4221                         $this->mStripList[] = $tag;
4222                 }
4223
4224                 return $oldVal;
4225         }
4226
4227         function setTransparentTagHook( $tag, $callback ) {
4228                 $tag = strtolower( $tag );
4229                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4230                 $this->mTransparentTagHooks[$tag] = $callback;
4231
4232                 return $oldVal;
4233         }
4234
4235         /**
4236          * Remove all tag hooks
4237          */
4238         function clearTagHooks() {
4239                 $this->mTagHooks = array();
4240                 $this->mStripList = $this->mDefaultStripList;
4241         }
4242
4243         /**
4244          * Create a function, e.g. {{sum:1|2|3}}
4245          * The callback function should have the form:
4246          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4247          *
4248          * Or with SFH_OBJECT_ARGS:
4249          *    function myParserFunction( $parser, $frame, $args ) { ... }
4250          *
4251          * The callback may either return the text result of the function, or an array with the text
4252          * in element 0, and a number of flags in the other elements. The names of the flags are
4253          * specified in the keys. Valid flags are:
4254          *   found                     The text returned is valid, stop processing the template. This
4255          *                             is on by default.
4256          *   nowiki                    Wiki markup in the return value should be escaped
4257          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4258          *
4259          * @public
4260          *
4261          * @param string $id The magic word ID
4262          * @param mixed $callback The callback function (and object) to use
4263          * @param integer $flags a combination of the following flags:
4264          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4265          *
4266          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4267          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4268          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4269          *     the arguments, and to control the way they are expanded.
4270          *
4271          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4272          *     arguments, for instance:
4273          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4274          *
4275          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4276          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4277          *     working if/when this is changed.
4278          *
4279          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4280          *     expansion.
4281          *
4282          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4283          *     about the methods available in PPFrame and PPNode.
4284          *
4285          * @return The old callback function for this name, if any
4286          */
4287         function setFunctionHook( $id, $callback, $flags = 0 ) {
4288                 global $wgContLang;
4289
4290                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4291                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4292
4293                 # Add to function cache
4294                 $mw = MagicWord::get( $id );
4295                 if( !$mw )
4296                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4297
4298                 $synonyms = $mw->getSynonyms();
4299                 $sensitive = intval( $mw->isCaseSensitive() );
4300
4301                 foreach ( $synonyms as $syn ) {
4302                         # Case
4303                         if ( !$sensitive ) {
4304                                 $syn = $wgContLang->lc( $syn );
4305                         }
4306                         # Add leading hash
4307                         if ( !( $flags & SFH_NO_HASH ) ) {
4308                                 $syn = '#' . $syn;
4309                         }
4310                         # Remove trailing colon
4311                         if ( substr( $syn, -1, 1 ) === ':' ) {
4312                                 $syn = substr( $syn, 0, -1 );
4313                         }
4314                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4315                 }
4316                 return $oldVal;
4317         }
4318
4319         /**
4320          * Get all registered function hook identifiers
4321          *
4322          * @return array
4323          */
4324         function getFunctionHooks() {
4325                 return array_keys( $this->mFunctionHooks );
4326         }
4327
4328         /**
4329          * Create a tag function, e.g. <test>some stuff</test>.
4330          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4331          * Unlike parser functions, their content is not preprocessed.
4332          */
4333         function setFunctionTagHook( $tag, $callback, $flags ) {
4334                 $tag = strtolower( $tag );
4335                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4336                         $this->mFunctionTagHooks[$tag] : null;
4337                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4338
4339                 if( !in_array( $tag, $this->mStripList ) ) {
4340                         $this->mStripList[] = $tag;
4341                 }
4342
4343                 return $old;
4344         }
4345
4346         /**
4347          * FIXME: update documentation. makeLinkObj() is deprecated.
4348          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4349          * Placeholders created in Skin::makeLinkObj()
4350          * Returns an array of link CSS classes, indexed by PDBK.
4351          */
4352         function replaceLinkHolders( &$text, $options = 0 ) {
4353                 return $this->mLinkHolders->replace( $text );
4354         }
4355
4356         /**
4357          * Replace <!--LINK--> link placeholders with plain text of links
4358          * (not HTML-formatted).
4359          * @param string $text
4360          * @return string
4361          */
4362         function replaceLinkHoldersText( $text ) {
4363                 return $this->mLinkHolders->replaceText( $text );
4364         }
4365
4366         /**
4367          * Tag hook handler for 'pre'.
4368          */
4369         function renderPreTag( $text, $attribs ) {
4370                 // Backwards-compatibility hack
4371                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4372
4373                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4374                 return Xml::openElement( 'pre', $attribs ) .
4375                         Xml::escapeTagsOnly( $content ) .
4376                         '</pre>';
4377         }
4378
4379         /**
4380         * Tag hook handler for 'a'. Renders a HTML &lt;a&gt; tag, allowing most attributes, filtering href against
4381         * allowed protocols and spam blacklist.
4382         **/
4383         function renderHyperlink( $text, $params, $frame = false ) {
4384                 foreach ( $params as $name => $value ) {
4385                         $params[ $name ] = $this->replaceVariables( $value, $frame );
4386                 }
4387
4388                 $whitelist = Sanitizer::attributeWhitelist( 'a' );
4389                 $params = Sanitizer::validateAttributes( $params, $whitelist );
4390
4391                 $content = $this->recursiveTagParse( trim( $text ), $frame );
4392
4393                 if ( isset( $params[ 'href' ] ) ) {
4394                         $href = $params[ 'href' ];
4395                         $this->mOutput->addExternalLink( $href );
4396                         unset( $params[ 'href' ] );
4397                 } else {
4398                         # Non-link <a> tag
4399                         return Xml::openElement( 'a', $params ) . $content . Xml::closeElement( 'a' );
4400                 }
4401
4402                 $sk = $this->mOptions->getSkin();
4403                 $html = $sk->makeExternalLink( $href, $content, false, '', $params );
4404
4405                 return $html;
4406         }
4407
4408         /**
4409          * Renders an image gallery from a text with one line per image.
4410          * text labels may be given by using |-style alternative text. E.g.
4411          *   Image:one.jpg|The number "1"
4412          *   Image:tree.jpg|A tree
4413          * given as text will return the HTML of a gallery with two images,
4414          * labeled 'The number "1"' and
4415          * 'A tree'.
4416          */
4417         function renderImageGallery( $text, $params ) {
4418                 $ig = new ImageGallery();
4419                 $ig->setContextTitle( $this->mTitle );
4420                 $ig->setShowBytes( false );
4421                 $ig->setShowFilename( false );
4422                 $ig->setParser( $this );
4423                 $ig->setHideBadImages();
4424                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4425                 $ig->useSkin( $this->mOptions->getSkin() );
4426                 $ig->mRevisionId = $this->mRevisionId;
4427
4428                 if( isset( $params['caption'] ) ) {
4429                         $caption = $params['caption'];
4430                         $caption = htmlspecialchars( $caption );
4431                         $caption = $this->replaceInternalLinks( $caption );
4432                         $ig->setCaptionHtml( $caption );
4433                 }
4434                 if( isset( $params['perrow'] ) ) {
4435                         $ig->setPerRow( $params['perrow'] );
4436                 }
4437                 if( isset( $params['widths'] ) ) {
4438                         $ig->setWidths( $params['widths'] );
4439                 }
4440                 if( isset( $params['heights'] ) ) {
4441                         $ig->setHeights( $params['heights'] );
4442                 }
4443
4444                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4445
4446                 $lines = StringUtils::explode( "\n", $text );
4447                 foreach ( $lines as $line ) {
4448                         # match lines like these:
4449                         # Image:someimage.jpg|This is some image
4450                         $matches = array();
4451                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4452                         # Skip empty lines
4453                         if ( count( $matches ) == 0 ) {
4454                                 continue;
4455                         }
4456
4457                         if ( strpos( $matches[0], '%' ) !== false )
4458                                 $matches[1] = urldecode( $matches[1] );
4459                         $tp = Title::newFromText( $matches[1]/*, NS_FILE*/ );
4460                         $nt =& $tp;
4461                         if( is_null( $nt ) ) {
4462                                 # Bogus title. Ignore these so we don't bomb out later.
4463                                 continue;
4464                         }
4465                         if ( isset( $matches[3] ) ) {
4466                                 $label = $matches[3];
4467                         } else {
4468                                 $label = '';
4469                         }
4470
4471                         $html = $this->recursiveTagParse( trim( $label ) );
4472
4473                         $ig->add( $nt, $html );
4474
4475                         # Only add real images (bug #5586)
4476                         if ( $nt->getNamespace() == NS_FILE ) {
4477                                 $this->mOutput->addImage( $nt->getDBkey() );
4478                         }
4479                 }
4480                 return $ig->toHTML();
4481         }
4482
4483         function getImageParams( $handler ) {
4484                 if ( $handler ) {
4485                         $handlerClass = get_class( $handler );
4486                 } else {
4487                         $handlerClass = '';
4488                 }
4489                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4490                         // Initialise static lists
4491                         static $internalParamNames = array(
4492                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4493                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4494                                         'bottom', 'text-bottom' ),
4495                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4496                                         'upright', 'border', 'link', 'alt' ),
4497                         );
4498                         static $internalParamMap;
4499                         if ( !$internalParamMap ) {
4500                                 $internalParamMap = array();
4501                                 foreach ( $internalParamNames as $type => $names ) {
4502                                         foreach ( $names as $name ) {
4503                                                 $magicName = str_replace( '-', '_', "img_$name" );
4504                                                 $internalParamMap[$magicName] = array( $type, $name );
4505                                         }
4506                                 }
4507                         }
4508
4509                         // Add handler params
4510                         $paramMap = $internalParamMap;
4511                         if ( $handler ) {
4512                                 $handlerParamMap = $handler->getParamMap();
4513                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4514                                         $paramMap[$magic] = array( 'handler', $paramName );
4515                                 }
4516                         }
4517                         $this->mImageParams[$handlerClass] = $paramMap;
4518                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4519                 }
4520                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4521         }
4522
4523         /**
4524          * Parse image options text and use it to make an image
4525          * @param Title $title
4526          * @param string $options
4527          * @param LinkHolderArray $holders
4528          */
4529         function makeImage( $title, $options, $holders = false ) {
4530                 # Check if the options text is of the form "options|alt text"
4531                 # Options are:
4532                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4533                 #  * left       no resizing, just left align. label is used for alt= only
4534                 #  * right      same, but right aligned
4535                 #  * none       same, but not aligned
4536                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4537                 #  * center     center the image
4538                 #  * frame      Keep original image size, no magnify-button.
4539                 #  * framed     Same as "frame"
4540                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4541                 #  * upright    reduce width for upright images, rounded to full __0 px
4542                 #  * border     draw a 1px border around the image
4543                 #  * alt        Text for HTML alt attribute (defaults to empty)
4544                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4545                 # vertical-align values (no % or length right now):
4546                 #  * baseline
4547                 #  * sub
4548                 #  * super
4549                 #  * top
4550                 #  * text-top
4551                 #  * middle
4552                 #  * bottom
4553                 #  * text-bottom
4554
4555                 $parts = StringUtils::explode( "|", $options );
4556                 $sk = $this->mOptions->getSkin();
4557
4558                 # Give extensions a chance to select the file revision for us
4559                 $skip = $time = $descQuery = false;
4560                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4561
4562                 if ( $skip ) {
4563                         return $sk->link( $title );
4564                 }
4565
4566                 # Get the file
4567                 $imagename = $title->getDBkey();
4568                 $file = wfFindFile( $title, array( 'time' => $time ) );
4569                 # Get parameter map
4570                 $handler = $file ? $file->getHandler() : false;
4571
4572                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4573
4574                 # Process the input parameters
4575                 $caption = '';
4576                 $params = array( 'frame' => array(), 'handler' => array(),
4577                         'horizAlign' => array(), 'vertAlign' => array() );
4578                 foreach( $parts as $part ) {
4579                         $part = trim( $part );
4580                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4581                         $validated = false;
4582                         if( isset( $paramMap[$magicName] ) ) {
4583                                 list( $type, $paramName ) = $paramMap[$magicName];
4584
4585                                 // Special case; width and height come in one variable together
4586                                 if( $type === 'handler' && $paramName === 'width' ) {
4587                                         $m = array();
4588                                         # (bug 13500) In both cases (width/height and width only),
4589                                         # permit trailing "px" for backward compatibility.
4590                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4591                                                 $width = intval( $m[1] );
4592                                                 $height = intval( $m[2] );
4593                                                 if ( $handler->validateParam( 'width', $width ) ) {
4594                                                         $params[$type]['width'] = $width;
4595                                                         $validated = true;
4596                                                 }
4597                                                 if ( $handler->validateParam( 'height', $height ) ) {
4598                                                         $params[$type]['height'] = $height;
4599                                                         $validated = true;
4600                                                 }
4601                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4602                                                 $width = intval( $value );
4603                                                 if ( $handler->validateParam( 'width', $width ) ) {
4604                                                         $params[$type]['width'] = $width;
4605                                                         $validated = true;
4606                                                 }
4607                                         } // else no validation -- bug 13436
4608                                 } else {
4609                                         if ( $type === 'handler' ) {
4610                                                 # Validate handler parameter
4611                                                 $validated = $handler->validateParam( $paramName, $value );
4612                                         } else {
4613                                                 # Validate internal parameters
4614                                                 switch( $paramName ) {
4615                                                 case 'manualthumb':
4616                                                 case 'alt':
4617                                                         // @todo Fixme: possibly check validity here for
4618                                                         // manualthumb? downstream behavior seems odd with
4619                                                         // missing manual thumbs.
4620                                                         $validated = true;
4621                                                         $value = $this->stripAltText( $value, $holders );
4622                                                         break;
4623                                                 case 'link':
4624                                                         $chars = self::EXT_LINK_URL_CLASS;
4625                                                         $prots = $this->mUrlProtocols;
4626                                                         if ( $value === '' ) {
4627                                                                 $paramName = 'no-link';
4628                                                                 $value = true;
4629                                                                 $validated = true;
4630                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4631                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4632                                                                         $paramName = 'link-url';
4633                                                                         $this->mOutput->addExternalLink( $value );
4634                                                                         $validated = true;
4635                                                                 }
4636                                                         } else {
4637                                                                 $linkTitle = Title::newFromText( $value );
4638                                                                 if ( $linkTitle ) {
4639                                                                         $paramName = 'link-title';
4640                                                                         $value = $linkTitle;
4641                                                                         $this->mOutput->addLink( $linkTitle );
4642                                                                         $validated = true;
4643                                                                 }
4644                                                         }
4645                                                         break;
4646                                                 default:
4647                                                         // Most other things appear to be empty or numeric...
4648                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4649                                                 }
4650                                         }
4651
4652                                         if ( $validated ) {
4653                                                 $params[$type][$paramName] = $value;
4654                                         }
4655                                 }
4656                         }
4657                         if ( !$validated ) {
4658                                 $caption = $part;
4659                         }
4660                 }
4661
4662                 # Process alignment parameters
4663                 if ( $params['horizAlign'] ) {
4664                         $params['frame']['align'] = key( $params['horizAlign'] );
4665                 }
4666                 if ( $params['vertAlign'] ) {
4667                         $params['frame']['valign'] = key( $params['vertAlign'] );
4668                 }
4669
4670                 $params['frame']['caption'] = $caption;
4671
4672                 # Will the image be presented in a frame, with the caption below?
4673                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4674                                  isset( $params['frame']['framed'] ) ||
4675                                  isset( $params['frame']['thumbnail'] ) ||
4676                                  isset( $params['frame']['manualthumb'] );
4677
4678                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4679                 # came to also set the caption, ordinary text after the image -- which
4680                 # makes no sense, because that just repeats the text multiple times in
4681                 # screen readers.  It *also* came to set the title attribute.
4682                 #
4683                 # Now that we have an alt attribute, we should not set the alt text to
4684                 # equal the caption: that's worse than useless, it just repeats the
4685                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4686                 # use the unnamed parameter for alt text as well, just for the time be-
4687                 # ing, if the unnamed param is set and the alt param is not.
4688                 #
4689                 # For the future, we need to figure out if we want to tweak this more,
4690                 # e.g., introducing a title= parameter for the title; ignoring the un-
4691                 # named parameter entirely for images without a caption; adding an ex-
4692                 # plicit caption= parameter and preserving the old magic unnamed para-
4693                 # meter for BC; ...
4694                 if ( $imageIsFramed ) { # Framed image
4695                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4696                                 # No caption or alt text, add the filename as the alt text so
4697                                 # that screen readers at least get some description of the image
4698                                 $params['frame']['alt'] = $title->getText();
4699                         }
4700                         # Do not set $params['frame']['title'] because tooltips don't make sense
4701                         # for framed images
4702                 } else { # Inline image
4703                         if ( !isset( $params['frame']['alt'] ) ) {
4704                                 # No alt text, use the "caption" for the alt text
4705                                 if ( $caption !== '') {
4706                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4707                                 } else {
4708                                         # No caption, fall back to using the filename for the
4709                                         # alt text
4710                                         $params['frame']['alt'] = $title->getText();
4711                                 }
4712                         }
4713                         # Use the "caption" for the tooltip text
4714                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4715                 }
4716
4717                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4718
4719                 # Linker does the rest
4720                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4721
4722                 # Give the handler a chance to modify the parser object
4723                 if ( $handler ) {
4724                         $handler->parserTransformHook( $this, $file );
4725                 }
4726
4727                 return $ret;
4728         }
4729
4730         protected function stripAltText( $caption, $holders ) {
4731                 # Strip bad stuff out of the title (tooltip).  We can't just use
4732                 # replaceLinkHoldersText() here, because if this function is called
4733                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4734                 if ( $holders ) {
4735                         $tooltip = $holders->replaceText( $caption );
4736                 } else {
4737                         $tooltip = $this->replaceLinkHoldersText( $caption );
4738                 }
4739
4740                 # make sure there are no placeholders in thumbnail attributes
4741                 # that are later expanded to html- so expand them now and
4742                 # remove the tags
4743                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4744                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4745
4746                 return $tooltip;
4747         }
4748
4749         /**
4750          * Set a flag in the output object indicating that the content is dynamic and
4751          * shouldn't be cached.
4752          */
4753         function disableCache() {
4754                 wfDebug( "Parser output marked as uncacheable.\n" );
4755                 $this->mOutput->mCacheTime = -1;
4756         }
4757
4758         /**#@+
4759          * Callback from the Sanitizer for expanding items found in HTML attribute
4760          * values, so they can be safely tested and escaped.
4761          * @param string $text
4762          * @param PPFrame $frame
4763          * @return string
4764          * @private
4765          */
4766         function attributeStripCallback( &$text, $frame = false ) {
4767                 $text = $this->replaceVariables( $text, $frame );
4768                 $text = $this->mStripState->unstripBoth( $text );
4769                 return $text;
4770         }
4771
4772         /**#@-*/
4773
4774         /**#@+
4775          * Accessor/mutator
4776          */
4777         function Title( $x = null ) { return wfSetVar( $this->mTitle, $x ); }
4778         function Options( $x = null ) { return wfSetVar( $this->mOptions, $x ); }
4779         function OutputType( $x = null ) { return wfSetVar( $this->mOutputType, $x ); }
4780         /**#@-*/
4781
4782         /**#@+
4783          * Accessor
4784          */
4785         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4786         /**#@-*/
4787
4788
4789         /**
4790          * Break wikitext input into sections, and either pull or replace
4791          * some particular section's text.
4792          *
4793          * External callers should use the getSection and replaceSection methods.
4794          *
4795          * @param string $text Page wikitext
4796          * @param string $section A section identifier string of the form:
4797          *   <flag1> - <flag2> - ... - <section number>
4798          *
4799          * Currently the only recognised flag is "T", which means the target section number
4800          * was derived during a template inclusion parse, in other words this is a template
4801          * section edit link. If no flags are given, it was an ordinary section edit link.
4802          * This flag is required to avoid a section numbering mismatch when a section is
4803          * enclosed by <includeonly> (bug 6563).
4804          *
4805          * The section number 0 pulls the text before the first heading; other numbers will
4806          * pull the given section along with its lower-level subsections. If the section is
4807          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4808          *
4809          * @param string $mode One of "get" or "replace"
4810          * @param string $newText Replacement text for section data.
4811          * @return string for "get", the extracted section text.
4812          *                for "replace", the whole page with the section replaced.
4813          */
4814         private function extractSections( $text, $section, $mode, $newText='' ) {
4815                 global $wgTitle;
4816                 $this->clearState();
4817                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4818                 $this->mOptions = new ParserOptions;
4819                 $this->setOutputType( self::OT_WIKI );
4820                 $outText = '';
4821                 $frame = $this->getPreprocessor()->newFrame();
4822
4823                 // Process section extraction flags
4824                 $flags = 0;
4825                 $sectionParts = explode( '-', $section );
4826                 $sectionIndex = array_pop( $sectionParts );
4827                 foreach ( $sectionParts as $part ) {
4828                         if ( $part === 'T' ) {
4829                                 $flags |= self::PTD_FOR_INCLUSION;
4830                         }
4831                 }
4832                 // Preprocess the text
4833                 $root = $this->preprocessToDom( $text, $flags );
4834
4835                 // <h> nodes indicate section breaks
4836                 // They can only occur at the top level, so we can find them by iterating the root's children
4837                 $node = $root->getFirstChild();
4838
4839                 // Find the target section
4840                 if ( $sectionIndex == 0 ) {
4841                         // Section zero doesn't nest, level=big
4842                         $targetLevel = 1000;
4843                 } else {
4844             while ( $node ) {
4845                 if ( $node->getName() === 'h' ) {
4846                     $bits = $node->splitHeading();
4847                                         if ( $bits['i'] == $sectionIndex ) {
4848                                         $targetLevel = $bits['level'];
4849                                                 break;
4850                                         }
4851                                 }
4852                                 if ( $mode === 'replace' ) {
4853                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4854                                 }
4855                                 $node = $node->getNextSibling();
4856                         }
4857                 }
4858
4859                 if ( !$node ) {
4860                         // Not found
4861                         if ( $mode === 'get' ) {
4862                                 return $newText;
4863                         } else {
4864                                 return $text;
4865                         }
4866                 }
4867
4868                 // Find the end of the section, including nested sections
4869                 do {
4870                         if ( $node->getName() === 'h' ) {
4871                                 $bits = $node->splitHeading();
4872                                 $curLevel = $bits['level'];
4873                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4874                                         break;
4875                                 }
4876                         }
4877                         if ( $mode === 'get' ) {
4878                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4879                         }
4880                         $node = $node->getNextSibling();
4881                 } while ( $node );
4882
4883                 // Write out the remainder (in replace mode only)
4884                 if ( $mode === 'replace' ) {
4885                         // Output the replacement text
4886                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4887                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4888                         // Only add trailing whitespace if there is newText
4889                         if($newText != "") {
4890                                 $outText .= $newText . "\n\n";
4891                         }
4892
4893                         while ( $node ) {
4894                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4895                                 $node = $node->getNextSibling();
4896                         }
4897                 }
4898
4899                 if ( is_string( $outText ) ) {
4900                         // Re-insert stripped tags
4901                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4902                 }
4903
4904                 return $outText;
4905         }
4906
4907         /**
4908          * This function returns the text of a section, specified by a number ($section).
4909          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4910          * the first section before any such heading (section 0).
4911          *
4912          * If a section contains subsections, these are also returned.
4913          *
4914          * @param string $text text to look in
4915          * @param string $section section identifier
4916          * @param string $deftext default to return if section is not found
4917          * @return string text of the requested section
4918          */
4919         public function getSection( $text, $section, $deftext='' ) {
4920                 return $this->extractSections( $text, $section, "get", $deftext );
4921         }
4922
4923         public function replaceSection( $oldtext, $section, $text ) {
4924                 return $this->extractSections( $oldtext, $section, "replace", $text );
4925         }
4926
4927         /**
4928          * Get the timestamp associated with the current revision, adjusted for
4929          * the default server-local timestamp
4930          */
4931         function getRevisionTimestamp() {
4932                 if ( is_null( $this->mRevisionTimestamp ) ) {
4933                         wfProfileIn( __METHOD__ );
4934                         global $wgContLang;
4935                         $dbr = wfGetDB( DB_SLAVE );
4936                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4937                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4938
4939                         // Normalize timestamp to internal MW format for timezone processing.
4940                         // This has the added side-effect of replacing a null value with
4941                         // the current time, which gives us more sensible behavior for
4942                         // previews.
4943                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4944
4945                         // The cryptic '' timezone parameter tells to use the site-default
4946                         // timezone offset instead of the user settings.
4947                         //
4948                         // Since this value will be saved into the parser cache, served
4949                         // to other users, and potentially even used inside links and such,
4950                         // it needs to be consistent for all visitors.
4951                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4952
4953                         wfProfileOut( __METHOD__ );
4954                 }
4955                 return $this->mRevisionTimestamp;
4956         }
4957
4958         /**
4959          * Get the name of the user that edited the last revision
4960          */
4961         function getRevisionUser() {
4962                 // if this template is subst: the revision id will be blank,
4963                 // so just use the current user's name
4964                 if( $this->mRevisionId ) {
4965                         $revision = Revision::newFromId( $this->mRevisionId );
4966                         $revuser = $revision->getUserText();
4967                 } else {
4968                         global $wgUser;
4969                         $revuser = $wgUser->getName();
4970                 }
4971                 return $revuser;
4972         }
4973
4974         /**
4975          * Mutator for $mDefaultSort
4976          *
4977          * @param $sort New value
4978          */
4979         public function setDefaultSort( $sort ) {
4980                 $this->mDefaultSort = $sort;
4981         }
4982
4983         /**
4984          * Accessor for $mDefaultSort
4985          * Will use the title/prefixed title if none is set
4986          *
4987          * @return string
4988          */
4989         public function getDefaultSort() {
4990                 global $wgCategoryPrefixedDefaultSortkey;
4991                 if( $this->mDefaultSort !== false ) {
4992                         return $this->mDefaultSort;
4993                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4994                         !$wgCategoryPrefixedDefaultSortkey) {
4995                         return $this->mTitle->getText();
4996                 } else {
4997                         return $this->mTitle->getPrefixedText();
4998                 }
4999         }
5000
5001         /**
5002          * Accessor for $mDefaultSort
5003          * Unlike getDefaultSort(), will return false if none is set
5004          *
5005          * @return string or false
5006          */
5007         public function getCustomDefaultSort() {
5008                 return $this->mDefaultSort;
5009         }
5010
5011         /**
5012          * Try to guess the section anchor name based on a wikitext fragment
5013          * presumably extracted from a heading, for example "Header" from
5014          * "== Header ==".
5015          */
5016         public function guessSectionNameFromWikiText( $text ) {
5017                 # Strip out wikitext links(they break the anchor)
5018                 $text = $this->stripSectionName( $text );
5019                 $headline = Sanitizer::decodeCharReferences( $text );
5020                 # strip out HTML
5021                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
5022                 $headline = trim( $headline );
5023                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
5024                 $replacearray = array(
5025                         '%3A' => ':',
5026                         '%' => '.'
5027                 );
5028                 return str_replace(
5029                         array_keys( $replacearray ),
5030                         array_values( $replacearray ),
5031                         $sectionanchor );
5032         }
5033
5034         /**
5035          * Strips a text string of wikitext for use in a section anchor
5036          *
5037          * Accepts a text string and then removes all wikitext from the
5038          * string and leaves only the resultant text (i.e. the result of
5039          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5040          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5041          * to create valid section anchors by mimicing the output of the
5042          * parser when headings are parsed.
5043          *
5044          * @param $text string Text string to be stripped of wikitext
5045          * for use in a Section anchor
5046          * @return Filtered text string
5047          */
5048         public function stripSectionName( $text ) {
5049                 # Strip internal link markup
5050                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
5051                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
5052
5053                 # Strip external link markup (FIXME: Not Tolerant to blank link text
5054                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5055                 # on how many empty links there are on the page - need to figure that out.
5056                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
5057
5058                 # Parse wikitext quotes (italics & bold)
5059                 $text = $this->doQuotes($text);
5060
5061                 # Strip HTML tags
5062                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5063                 return $text;
5064         }
5065
5066         function srvus( $text ) {
5067                 return $this->testSrvus( $text, $this->mOutputType );
5068         }
5069
5070         /**
5071          * strip/replaceVariables/unstrip for preprocessor regression testing
5072          */
5073         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5074                 $this->clearState();
5075                 if ( ! ( $title instanceof Title ) ) {
5076                         $title = Title::newFromText( $title );
5077                 }
5078                 $this->mTitle = $title;
5079                 $this->mOptions = $options;
5080                 $this->setOutputType( $outputType );
5081                 $text = $this->replaceVariables( $text );
5082                 $text = $this->mStripState->unstripBoth( $text );
5083                 $text = Sanitizer::removeHTMLtags( $text );
5084                 return $text;
5085         }
5086
5087         function testPst( $text, $title, $options ) {
5088                 global $wgUser;
5089                 if ( ! ( $title instanceof Title ) ) {
5090                         $title = Title::newFromText( $title );
5091                 }
5092                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5093         }
5094
5095         function testPreprocess( $text, $title, $options ) {
5096                 if ( ! ( $title instanceof Title ) ) {
5097                         $title = Title::newFromText( $title );
5098                 }
5099                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5100         }
5101
5102         function markerSkipCallback( $s, $callback ) {
5103                 $i = 0;
5104                 $out = '';
5105                 while ( $i < strlen( $s ) ) {
5106                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5107                         if ( $markerStart === false ) {
5108                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5109                                 break;
5110                         } else {
5111                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5112                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5113                                 if ( $markerEnd === false ) {
5114                                         $out .= substr( $s, $markerStart );
5115                                         break;
5116                                 } else {
5117                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5118                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5119                                         $i = $markerEnd;
5120                                 }
5121                         }
5122                 }
5123                 return $out;
5124         }
5125
5126         function serialiseHalfParsedText( $text ) {
5127                 $data = array();
5128                 $data['text'] = $text;
5129
5130                 // First, find all strip markers, and store their
5131                 //  data in an array.
5132                 $stripState = new StripState;
5133                 $pos = 0;
5134                 while( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) ) && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) ) {
5135                         $end_pos += strlen( self::MARKER_SUFFIX );
5136                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5137
5138                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5139                                 $replaceArray = $stripState->general;
5140                                 $stripText = $this->mStripState->general->data[$marker];
5141                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5142                                 $replaceArray = $stripState->nowiki;
5143                                 $stripText = $this->mStripState->nowiki->data[$marker];
5144                         } else {
5145                                 throw new MWException( "Hanging strip marker: '$marker'." );
5146                         }
5147
5148                         $replaceArray->setPair( $marker, $stripText );
5149                         $pos = $end_pos;
5150                 }
5151                 $data['stripstate'] = $stripState;
5152
5153                 // Now, find all of our links, and store THEIR
5154                 //  data in an array! :)
5155                 $links = array( 'internal' => array(), 'interwiki' => array() );
5156                 $pos = 0;
5157
5158                 // Internal links
5159                 while( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5160                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5161
5162                         $ns = trim($ns);
5163                         if (empty( $links['internal'][$ns] )) {
5164                                 $links['internal'][$ns] = array();
5165                         }
5166
5167                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5168                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5169                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5170                 }
5171
5172                 $pos = 0;
5173
5174                 // Interwiki links
5175                 while( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5176                         $data = substr( $text, $start_pos );
5177                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5178                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5179                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5180                 }
5181
5182                 $data['linkholder'] = $links;
5183
5184                 return $data;
5185         }
5186
5187         function unserialiseHalfParsedText( $data, $intPrefix = null /* Unique identifying prefix */ ) {
5188                 if (!$intPrefix)
5189                         $intPrefix = $this->getRandomString();
5190
5191                 // First, extract the strip state.
5192                 $stripState = $data['stripstate'];
5193                 $this->mStripState->general->merge( $stripState->general );
5194                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5195
5196                 // Now, extract the text, and renumber links
5197                 $text = $data['text'];
5198                 $links = $data['linkholder'];
5199
5200                 // Internal...
5201                 foreach( $links['internal'] as $ns => $nsLinks ) {
5202                         foreach( $nsLinks as $key => $entry ) {
5203                                 $newKey = $intPrefix . '-' . $key;
5204                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5205
5206                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5207                         }
5208                 }
5209
5210                 // Interwiki...
5211                 foreach( $links['interwiki'] as $key => $entry ) {
5212                         $newKey = "$intPrefix-$key";
5213                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5214
5215                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5216                 }
5217
5218                 // Should be good to go.
5219                 return $text;
5220         }
5221 }
5222
5223 /**
5224  * @todo document, briefly.
5225  * @ingroup Parser
5226  */
5227 class StripState {
5228         var $general, $nowiki;
5229
5230         function __construct() {
5231                 $this->general = new ReplacementArray;
5232                 $this->nowiki = new ReplacementArray;
5233         }
5234
5235         function unstripGeneral( $text ) {
5236                 wfProfileIn( __METHOD__ );
5237                 do {
5238                         $oldText = $text;
5239                         $text = $this->general->replace( $text );
5240                 } while ( $text !== $oldText );
5241                 wfProfileOut( __METHOD__ );
5242                 return $text;
5243         }
5244
5245         function unstripNoWiki( $text ) {
5246                 wfProfileIn( __METHOD__ );
5247                 do {
5248                         $oldText = $text;
5249                         $text = $this->nowiki->replace( $text );
5250                 } while ( $text !== $oldText );
5251                 wfProfileOut( __METHOD__ );
5252                 return $text;
5253         }
5254
5255         function unstripBoth( $text ) {
5256                 wfProfileIn( __METHOD__ );
5257                 do {
5258                         $oldText = $text;
5259                         $text = $this->general->replace( $text );
5260                         $text = $this->nowiki->replace( $text );
5261                 } while ( $text !== $oldText );
5262                 wfProfileOut( __METHOD__ );
5263                 return $text;
5264         }
5265 }
5266
5267 /**
5268  * @todo document, briefly.
5269  * @ingroup Parser
5270  */
5271 class OnlyIncludeReplacer {
5272         var $output = '';
5273
5274         function replace( $matches ) {
5275                 if ( substr( $matches[1], -1 ) === "\n" ) {
5276                         $this->output .= substr( $matches[1], 0, -1 );
5277                 } else {
5278                         $this->output .= $matches[1];
5279                 }
5280         }
5281 }