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                 $mSubsts, $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerIndex,
  95                 $mPreprocessor, $mExtLinkBracketedRegex, $mUrlProtocols, $mDefaultStripList,
  96                 $mVarCache, $mConf, $mFunctionTagHooks;
  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();
 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         }
 151
 152         /**
 153          * Reduce memory usage to reduce the impact of circular references
 154          */
 155         function __destruct() {
 156                 if ( isset( $this->mLinkHolders ) ) {
 157                         $this->mLinkHolders->__destruct();
 158                 }
 159                 foreach ( $this as $name => $value ) {
 160                         unset( $this->$name );
 161                 }
 162         }
 163
 164         /**
 165          * Do various kinds of initialisation on the first call of the parser
 166          */
 167         function firstCallInit() {
 168                 if ( !$this->mFirstCall ) {
 169                         return;
 170                 }
 171                 $this->mFirstCall = false;
 172
 173                 wfProfileIn( __METHOD__ );
 174
 175                 CoreParserFunctions::register( $this );
 176                 CoreTagHooks::register( $this );
 177                 $this->initialiseVariables();
 178
 179                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 180                 wfProfileOut( __METHOD__ );
 181         }
 182
 183         /**
 184          * Clear Parser state
 185          *
 186          * @private
 187          */
 188         function clearState() {
 189                 wfProfileIn( __METHOD__ );
 190                 if ( $this->mFirstCall ) {
 191                         $this->firstCallInit();
 192                 }
 193                 $this->mOutput = new ParserOutput;
 194                 $this->mAutonumber = 0;
 195                 $this->mLastSection = '';
 196                 $this->mDTopen = false;
 197                 $this->mIncludeCount = array();
 198                 $this->mStripState = new StripState;
 199                 $this->mArgStack = false;
 200                 $this->mInPre = false;
 201                 $this->mLinkHolders = new LinkHolderArray( $this );
 202                 $this->mLinkID = 0;
 203                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 204                 $this->mVarCache = array();
 205
 206                 /**
 207                  * Prefix for temporary replacement strings for the multipass parser.
 208                  * \x07 should never appear in input as it's disallowed in XML.
 209                  * Using it at the front also gives us a little extra robustness
 210                  * since it shouldn't match when butted up against identifier-like
 211                  * string constructs.
 212                  *
 213                  * Must not consist of all title characters, or else it will change
 214                  * the behaviour of <nowiki> in a link.
 215                  */
 216                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 217                 # Changed to \x7f to allow XML double-parsing -- TS
 218                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 219
 220
 221                 # Clear these on every parse, bug 4549
 222                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 223
 224                 $this->mShowToc = true;
 225                 $this->mForceTocPosition = false;
 226                 $this->mIncludeSizes = array(
 227                         'post-expand' => 0,
 228                         'arg' => 0,
 229                 );
 230                 $this->mPPNodeCount = 0;
 231                 $this->mDefaultSort = false;
 232                 $this->mHeadings = array();
 233                 $this->mDoubleUnderscores = array();
 234                 $this->mExpensiveFunctionCount = 0;
 235
 236                 # Fix cloning
 237                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 238                         $this->mPreprocessor = null;
 239                 }
 240
 241                 wfRunHooks( 'ParserClearState', array( &$this ) );
 242                 wfProfileOut( __METHOD__ );
 243         }
 244
 245         function setOutputType( $ot ) {
 246                 $this->mOutputType = $ot;
 247                 // Shortcut alias
 248                 $this->ot = array(
 249                         'html' => $ot == self::OT_HTML,
 250                         'wiki' => $ot == self::OT_WIKI,
 251                         'pre' => $ot == self::OT_PREPROCESS,
 252                 );
 253         }
 254
 255         /**
 256          * Set the context title
 257          */
 258         function setTitle( $t ) {
 259                 if ( !$t || $t instanceof FakeTitle ) {
 260                         $t = Title::newFromText( 'NO TITLE' );
 261                 }
 262
 263                 if ( strval( $t->getFragment() ) !== '' ) {
 264                         # Strip the fragment to avoid various odd effects
 265                         $this->mTitle = clone $t;
 266                         $this->mTitle->setFragment( '' );
 267                 } else {
 268                         $this->mTitle = $t;
 269                 }
 270         }
 271
 272         /**
 273          * Accessor for mUniqPrefix.
 274          *
 275          * @public
 276          */
 277         function uniqPrefix() {
 278                 if( !isset( $this->mUniqPrefix ) ) {
 279                         // @todo Fixme: this is probably *horribly wrong*
 280                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 281                         // if this is called for a parser cache hit, the parser may not
 282                         // have ever been initialized in the first place.
 283                         // Not really sure what the heck is supposed to be going on here.
 284                         return '';
 285                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 286                 }
 287                 return $this->mUniqPrefix;
 288         }
 289
 290         /**
 291          * Convert wikitext to HTML
 292          * Do not call this function recursively.
 293          *
 294          * @param $text String: text we want to parse
 295          * @param $title A title object
 296          * @param $options ParserOptions
 297          * @param $linestart boolean
 298          * @param $clearState boolean
 299          * @param $revid Int: number to pass in {{REVISIONID}}
 300          * @return ParserOutput a ParserOutput
 301          */
 302         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 303                 /**
 304                  * First pass--just handle <nowiki> sections, pass the rest off
 305                  * to internalParse() which does all the real work.
 306                  */
 307
 308                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang, $wgDisableLangConversion;
 309                 $fname = __METHOD__.'-' . wfGetCaller();
 310                 wfProfileIn( __METHOD__ );
 311                 wfProfileIn( $fname );
 312
 313                 if ( $clearState ) {
 314                         $this->clearState();
 315                 }
 316
 317                 $this->mOptions = $options;
 318                 $this->setTitle( $title ); // Page title has to be set for the pre-processor
 319
 320                 $oldRevisionId = $this->mRevisionId;
 321                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 322                 if( $revid !== null ) {
 323                         $this->mRevisionId = $revid;
 324                         $this->mRevisionTimestamp = null;
 325                 }
 326                 $this->setOutputType( self::OT_HTML );
 327                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 328                 # No more strip!
 329                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 330                 $text = $this->internalParse( $text );
 331
 332                 $text = $this->mStripState->unstripGeneral( $text );
 333
 334                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 335                 $fixtags = array(
 336                         # french spaces, last one Guillemet-left
 337                         # only if there is something before the space
 338                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 339                         # french spaces, Guillemet-right
 340                         '/(\\302\\253) /' => '\\1&nbsp;',
 341                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 342                 );
 343                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 344
 345                 $text = $this->doBlockLevels( $text, $linestart );
 346
 347                 $this->replaceLinkHolders( $text );
 348
 349                 // The position of the convert() call should not be changed. it
 350                 // assumes that the links are all replaced and the only thing left
 351                 // is the <nowiki> mark.
 352                 if ( !( $wgDisableLangConversion
 353                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 354                                 || $this->mTitle->isTalkPage()
 355                                 || $this->mTitle->isConversionTable() ) ) {
 356                         $text = $wgContLang->convert( $text );
 357                 }
 358
 359                 // A title may have been set in a conversion rule.
 360                 // Note that if a user tries to set a title in a conversion
 361                 // rule but content conversion was not done, then the parser
 362                 // won't pick it up.  This is probably expected behavior.
 363                 if ( $wgContLang->getConvRuleTitle() ) {
 364                         $this->mOutput->setTitleText( $wgContLang->getConvRuleTitle() );
 365                 } elseif ( !( $wgDisableLangConversion
 366                                           || isset( $this->mDoubleUnderscores['notitleconvert'] ) ) ) {
 367                         $this->mOutput->setTitleText( $wgContLang->convert( $title->getPrefixedText() ) );
 368                 }
 369
 370                 $text = $this->mStripState->unstripNoWiki( $text );
 371
 372                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 373
 374 //!JF Move to its own function
 375
 376                 $uniq_prefix = $this->mUniqPrefix;
 377                 $matches = array();
 378                 $elements = array_keys( $this->mTransparentTagHooks );
 379                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 380
 381                 foreach( $matches as $marker => $data ) {
 382                         list( $element, $content, $params, $tag ) = $data;
 383                         $tagName = strtolower( $element );
 384                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 385                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 386                                         array( $content, $params, $this ) );
 387                         } else {
 388                                 $output = $tag;
 389                         }
 390                         $this->mStripState->general->setPair( $marker, $output );
 391                 }
 392                 $text = $this->mStripState->unstripGeneral( $text );
 393
 394                 $text = Sanitizer::normalizeCharReferences( $text );
 395
 396                 if ( ( $wgUseTidy && $this->mOptions->mTidy ) || $wgAlwaysUseTidy ) {
 397                         $text = MWTidy::tidy( $text );
 398                 } else {
 399                         # attempt to sanitize at least some nesting problems
 400                         # (bug #2702 and quite a few others)
 401                         $tidyregs = array(
 402                                 # ''Something [http://www.cool.com cool''] -->
 403                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 404                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 405                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 406                                 # fix up an anchor inside another anchor, only
 407                                 # at least for a single single nested link (bug 3695)
 408                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 409                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 410                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 411                                 # contains a div, so fix it up here; replace
 412                                 # div with escaped text
 413                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 414                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 415                                 # remove empty italic or bold tag pairs, some
 416                                 # introduced by rules above
 417                                 '/<([bi])><\/\\1>/' => '',
 418                         );
 419
 420                         $text = preg_replace(
 421                                 array_keys( $tidyregs ),
 422                                 array_values( $tidyregs ),
 423                                 $text );
 424                 }
 425                 global $wgExpensiveParserFunctionLimit;
 426                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 427                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 428                 }
 429
 430                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 431
 432                 # Information on include size limits, for the benefit of users who try to skirt them
 433                 if ( $this->mOptions->getEnableLimitReport() ) {
 434                         global $wgExpensiveParserFunctionLimit;
 435                         $max = $this->mOptions->getMaxIncludeSize();
 436                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 437                         $limitReport =
 438                                 "NewPP limit report\n" .
 439                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 440                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 441                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 442                                 $PFreport;
 443                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 444                         $text .= "\n<!-- \n$limitReport-->\n";
 445                 }
 446                 $this->mOutput->setText( $text );
 447
 448                 $this->mRevisionId = $oldRevisionId;
 449                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 450                 wfProfileOut( $fname );
 451                 wfProfileOut( __METHOD__ );
 452
 453                 return $this->mOutput;
 454         }
 455
 456         /**
 457          * Recursive parser entry point that can be called from an extension tag
 458          * hook.
 459          *
 460          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 461          *
 462          * @param $text String: text extension wants to have parsed
 463          * @param PPFrame $frame: The frame to use for expanding any template variables
 464          */
 465         function recursiveTagParse( $text, $frame=false ) {
 466                 wfProfileIn( __METHOD__ );
 467                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 468                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 469                 $text = $this->internalParse( $text, false, $frame );
 470                 wfProfileOut( __METHOD__ );
 471                 return $text;
 472         }
 473
 474         /**
 475          * Expand templates and variables in the text, producing valid, static wikitext.
 476          * Also removes comments.
 477          */
 478         function preprocess( $text, $title, $options, $revid = null ) {
 479                 wfProfileIn( __METHOD__ );
 480                 $this->clearState();
 481                 $this->setOutputType( self::OT_PREPROCESS );
 482                 $this->mOptions = $options;
 483                 $this->setTitle( $title );
 484                 if( $revid !== null ) {
 485                         $this->mRevisionId = $revid;
 486                 }
 487                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 488                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 489                 $text = $this->replaceVariables( $text );
 490                 $text = $this->mStripState->unstripBoth( $text );
 491                 wfProfileOut( __METHOD__ );
 492                 return $text;
 493         }
 494
 495         /**
 496          * Get the wikitext of a page as though it was transcluded.
 497          *
 498          * Specifically <includeonly> etc. are parsed, redirects are followed, comments
 499          * are removed, but templates arguments and parser functions are untouched.
 500          *
 501          * This is not called by the parser itself, see braceSubstitution for its transclusion.
 502          */
 503         public function getTransclusionText( $title ) {
 504                 list( $text, $title ) = $this->getTemplateDom( $title );
 505                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 506                 return $this->getPreprocessor()->newFrame()->expand( $text, $flags );
 507         }
 508
 509         /**
 510          * Get a random string
 511          *
 512          * @private
 513          * @static
 514          */
 515         function getRandomString() {
 516                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 517         }
 518
 519         function &getTitle() { return $this->mTitle; }
 520         function getOptions() { return $this->mOptions; }
 521         function getRevisionId() { return $this->mRevisionId; }
 522         function getOutput() { return $this->mOutput; }
 523         function nextLinkID() { return $this->mLinkID++; }
 524
 525         function getFunctionLang() {
 526                 global $wgLang, $wgContLang;
 527
 528                 $target = $this->mOptions->getTargetLanguage();
 529                 if ( $target !== null ) {
 530                         return $target;
 531                 } else {
 532                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 533                 }
 534         }
 535
 536         /**
 537          * Get a preprocessor object
 538          */
 539         function getPreprocessor() {
 540                 if ( !isset( $this->mPreprocessor ) ) {
 541                         $class = $this->mPreprocessorClass;
 542                         $this->mPreprocessor = new $class( $this );
 543                 }
 544                 return $this->mPreprocessor;
 545         }
 546
 547         /**
 548          * Replaces all occurrences of HTML-style comments and the given tags
 549          * in the text with a random marker and returns the next text. The output
 550          * parameter $matches will be an associative array filled with data in
 551          * the form:
 552          *   'UNIQ-xxxxx' => array(
 553          *     'element',
 554          *     'tag content',
 555          *     array( 'param' => 'x' ),
 556          *     '<element param="x">tag content</element>' ) )
 557          *
 558          * @param $elements list of element names. Comments are always extracted.
 559          * @param $text Source text string.
 560          * @param $uniq_prefix
 561          *
 562          * @public
 563          * @static
 564          */
 565         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 566                 static $n = 1;
 567                 $stripped = '';
 568                 $matches = array();
 569
 570                 $taglist = implode( '|', $elements );
 571                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 572
 573                 while ( $text != '' ) {
 574                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 575                         $stripped .= $p[0];
 576                         if( count( $p ) < 5 ) {
 577                                 break;
 578                         }
 579                         if( count( $p ) > 5 ) {
 580                                 // comment
 581                                 $element    = $p[4];
 582                                 $attributes = '';
 583                                 $close      = '';
 584                                 $inside     = $p[5];
 585                         } else {
 586                                 // tag
 587                                 $element    = $p[1];
 588                                 $attributes = $p[2];
 589                                 $close      = $p[3];
 590                                 $inside     = $p[4];
 591                         }
 592
 593                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 594                         $stripped .= $marker;
 595
 596                         if ( $close === '/>' ) {
 597                                 // Empty element tag, <tag />
 598                                 $content = null;
 599                                 $text = $inside;
 600                                 $tail = null;
 601                         } else {
 602                                 if( $element === '!--' ) {
 603                                         $end = '/(-->)/';
 604                                 } else {
 605                                         $end = "/(<\\/$element\\s*>)/i";
 606                                 }
 607                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 608                                 $content = $q[0];
 609                                 if( count( $q ) < 3 ) {
 610                                         # No end tag -- let it run out to the end of the text.
 611                                         $tail = '';
 612                                         $text = '';
 613                                 } else {
 614                                         $tail = $q[1];
 615                                         $text = $q[2];
 616                                 }
 617                         }
 618
 619                         $matches[$marker] = array( $element,
 620                                 $content,
 621                                 Sanitizer::decodeTagAttributes( $attributes ),
 622                                 "<$element$attributes$close$content$tail" );
 623                 }
 624                 return $stripped;
 625         }
 626
 627         /**
 628          * Get a list of strippable XML-like elements
 629          */
 630         function getStripList() {
 631                 return $this->mStripList;
 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                                         } else {
1748                                                 $s .= $prefix . $trail;
1749                                         }
1750                                         $this->mOutput->addImage( $nt->getDBkey() );
1751                                         wfProfileOut( __METHOD__."-image" );
1752                                         continue;
1753
1754                                 }
1755
1756                                 if ( $ns == NS_CATEGORY ) {
1757                                         wfProfileIn( __METHOD__."-category" );
1758                                         $s = rtrim($s . "\n"); # bug 87
1759
1760                                         if ( $wasblank ) {
1761                                                 $sortkey = $this->getDefaultSort();
1762                                         } else {
1763                                                 $sortkey = $text;
1764                                         }
1765                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1766                                         $sortkey = str_replace( "\n", '', $sortkey );
1767                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1768                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1769
1770                                         /**
1771                                          * Strip the whitespace Category links produce, see bug 87
1772                                          * @todo We might want to use trim($tmp, "\n") here.
1773                                          */
1774                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1775
1776                                         wfProfileOut( __METHOD__."-category" );
1777                                         continue;
1778                                 }
1779                         }
1780
1781                         # Self-link checking
1782                         if( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1783                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1784                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1785                                         continue;
1786                                 }
1787                         }
1788
1789                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1790                         # FIXME: Should do batch file existence checks, see comment below
1791                         if( $ns == NS_MEDIA ) {
1792                                 wfProfileIn( __METHOD__."-media" );
1793                                 # Give extensions a chance to select the file revision for us
1794                                 $skip = $time = false;
1795                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1796                                 if ( $skip ) {
1797                                         $link = $sk->link( $nt );
1798                                 } else {
1799                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1800                                 }
1801                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1802                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1803                                 $this->mOutput->addImage( $nt->getDBkey() );
1804                                 wfProfileOut( __METHOD__."-media" );
1805                                 continue;
1806                         }
1807
1808                         wfProfileIn( __METHOD__."-always_known" );
1809                         # Some titles, such as valid special pages or files in foreign repos, should
1810                         # be shown as bluelinks even though they're not included in the page table
1811                         #
1812                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1813                         # batch file existence checks for NS_FILE and NS_MEDIA
1814                         if( $iw == '' && $nt->isAlwaysKnown() ) {
1815                                 $this->mOutput->addLink( $nt );
1816                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1817                         } else {
1818                                 # Links will be added to the output link list after checking
1819                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1820                         }
1821                         wfProfileOut( __METHOD__."-always_known" );
1822                 }
1823                 wfProfileOut( __METHOD__ );
1824                 return $holders;
1825         }
1826
1827         /**
1828          * Make a link placeholder. The text returned can be later resolved to a real link with
1829          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1830          * parsing of interwiki links, and secondly to allow all existence checks and
1831          * article length checks (for stub links) to be bundled into a single query.
1832          *
1833          * @deprecated
1834          */
1835         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1836                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1837         }
1838
1839         /**
1840          * Render a forced-blue link inline; protect against double expansion of
1841          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1842          * Since this little disaster has to split off the trail text to avoid
1843          * breaking URLs in the following text without breaking trails on the
1844          * wiki links, it's been made into a horrible function.
1845          *
1846          * @param Title $nt
1847          * @param string $text
1848          * @param string $query
1849          * @param string $trail
1850          * @param string $prefix
1851          * @return string HTML-wikitext mix oh yuck
1852          */
1853         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1854                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1855                 $sk = $this->mOptions->getSkin();
1856                 // FIXME: use link() instead of deprecated makeKnownLinkObj()
1857                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1858                 return $this->armorLinks( $link ) . $trail;
1859         }
1860
1861         /**
1862          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1863          * going to go through further parsing steps before inline URL expansion.
1864          *
1865          * Not needed quite as much as it used to be since free links are a bit
1866          * more sensible these days. But bracketed links are still an issue.
1867          *
1868          * @param string more-or-less HTML
1869          * @return string less-or-more HTML with NOPARSE bits
1870          */
1871         function armorLinks( $text ) {
1872                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1873                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1874         }
1875
1876         /**
1877          * Return true if subpage links should be expanded on this page.
1878          * @return bool
1879          */
1880         function areSubpagesAllowed() {
1881                 # Some namespaces don't allow subpages
1882                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1883         }
1884
1885         /**
1886          * Handle link to subpage if necessary
1887          * @param string $target the source of the link
1888          * @param string &$text the link text, modified as necessary
1889          * @return string the full name of the link
1890          * @private
1891          */
1892         function maybeDoSubpageLink($target, &$text) {
1893                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1894         }
1895
1896         /**#@+
1897          * Used by doBlockLevels()
1898          * @private
1899          */
1900         /* private */ function closeParagraph() {
1901                 $result = '';
1902                 if ( $this->mLastSection != '' ) {
1903                         $result = '</' . $this->mLastSection  . ">\n";
1904                 }
1905                 $this->mInPre = false;
1906                 $this->mLastSection = '';
1907                 return $result;
1908         }
1909         # getCommon() returns the length of the longest common substring
1910         # of both arguments, starting at the beginning of both.
1911         #
1912         /* private */ function getCommon( $st1, $st2 ) {
1913                 $fl = strlen( $st1 );
1914                 $shorter = strlen( $st2 );
1915                 if ( $fl < $shorter ) { $shorter = $fl; }
1916
1917                 for ( $i = 0; $i < $shorter; ++$i ) {
1918                         if ( $st1{$i} != $st2{$i} ) { break; }
1919                 }
1920                 return $i;
1921         }
1922         # These next three functions open, continue, and close the list
1923         # element appropriate to the prefix character passed into them.
1924         #
1925         /* private */ function openList( $char ) {
1926                 $result = $this->closeParagraph();
1927
1928                 if ( '*' === $char ) { $result .= '<ul><li>'; }
1929                 elseif ( '#' === $char ) { $result .= '<ol><li>'; }
1930                 elseif ( ':' === $char ) { $result .= '<dl><dd>'; }
1931                 elseif ( ';' === $char ) {
1932                         $result .= '<dl><dt>';
1933                         $this->mDTopen = true;
1934                 }
1935                 else { $result = '<!-- ERR 1 -->'; }
1936
1937                 return $result;
1938         }
1939
1940         /* private */ function nextItem( $char ) {
1941                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
1942                 elseif ( ':' === $char || ';' === $char ) {
1943                         $close = '</dd>';
1944                         if ( $this->mDTopen ) { $close = '</dt>'; }
1945                         if ( ';' === $char ) {
1946                                 $this->mDTopen = true;
1947                                 return $close . '<dt>';
1948                         } else {
1949                                 $this->mDTopen = false;
1950                                 return $close . '<dd>';
1951                         }
1952                 }
1953                 return '<!-- ERR 2 -->';
1954         }
1955
1956         /* private */ function closeList( $char ) {
1957                 if ( '*' === $char ) { $text = '</li></ul>'; }
1958                 elseif ( '#' === $char ) { $text = '</li></ol>'; }
1959                 elseif ( ':' === $char ) {
1960                         if ( $this->mDTopen ) {
1961                                 $this->mDTopen = false;
1962                                 $text = '</dt></dl>';
1963                         } else {
1964                                 $text = '</dd></dl>';
1965                         }
1966                 }
1967                 else {  return '<!-- ERR 3 -->'; }
1968                 return $text."\n";
1969         }
1970         /**#@-*/
1971
1972         /**
1973          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
1974          *
1975          * @param $linestart bool whether or not this is at the start of a line.
1976          * @private
1977          * @return string the lists rendered as HTML
1978          */
1979         function doBlockLevels( $text, $linestart ) {
1980                 wfProfileIn( __METHOD__ );
1981
1982                 # Parsing through the text line by line.  The main thing
1983                 # happening here is handling of block-level elements p, pre,
1984                 # and making lists from lines starting with * # : etc.
1985                 #
1986                 $textLines = StringUtils::explode( "\n", $text );
1987
1988                 $lastPrefix = $output = '';
1989                 $this->mDTopen = $inBlockElem = false;
1990                 $prefixLength = 0;
1991                 $paragraphStack = false;
1992
1993                 foreach ( $textLines as $oLine ) {
1994                         # Fix up $linestart
1995                         if ( !$linestart ) {
1996                                 $output .= $oLine;
1997                                 $linestart = true;
1998                                 continue;
1999                         }
2000                         // * = ul
2001                         // # = ol
2002                         // ; = dt
2003                         // : = dd
2004
2005                         $lastPrefixLength = strlen( $lastPrefix );
2006                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2007                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2008                         // If not in a <pre> element, scan for and figure out what prefixes are there.
2009                         if ( !$this->mInPre ) {
2010                                 # Multiple prefixes may abut each other for nested lists.
2011                                 $prefixLength = strspn( $oLine, '*#:;' );
2012                                 $prefix = substr( $oLine, 0, $prefixLength );
2013
2014                                 # eh?
2015                                 // ; and : are both from definition-lists, so they're equivalent
2016                                 //  for the purposes of determining whether or not we need to open/close
2017                                 //  elements.
2018                                 $prefix2 = str_replace( ';', ':', $prefix );
2019                                 $t = substr( $oLine, $prefixLength );
2020                                 $this->mInPre = (bool)$preOpenMatch;
2021                         } else {
2022                                 # Don't interpret any other prefixes in preformatted text
2023                                 $prefixLength = 0;
2024                                 $prefix = $prefix2 = '';
2025                                 $t = $oLine;
2026                         }
2027
2028                         # List generation
2029                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2030                                 # Same as the last item, so no need to deal with nesting or opening stuff
2031                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2032                                 $paragraphStack = false;
2033
2034                                 if ( substr( $prefix, -1 ) === ';') {
2035                                         # The one nasty exception: definition lists work like this:
2036                                         # ; title : definition text
2037                                         # So we check for : in the remainder text to split up the
2038                                         # title and definition, without b0rking links.
2039                                         $term = $t2 = '';
2040                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2041                                                 $t = $t2;
2042                                                 $output .= $term . $this->nextItem( ':' );
2043                                         }
2044                                 }
2045                         } elseif( $prefixLength || $lastPrefixLength ) {
2046                                 // We need to open or close prefixes, or both.
2047
2048                                 # Either open or close a level...
2049                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2050                                 $paragraphStack = false;
2051
2052                                 // Close all the prefixes which aren't shared.
2053                                 while( $commonPrefixLength < $lastPrefixLength ) {
2054                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2055                                         --$lastPrefixLength;
2056                                 }
2057
2058                                 // Continue the current prefix if appropriate.
2059                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2060                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2061                                 }
2062
2063                                 // Open prefixes where appropriate.
2064                                 while ( $prefixLength > $commonPrefixLength ) {
2065                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2066                                         $output .= $this->openList( $char );
2067
2068                                         if ( ';' === $char ) {
2069                                                 # FIXME: This is dupe of code above
2070                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2071                                                         $t = $t2;
2072                                                         $output .= $term . $this->nextItem( ':' );
2073                                                 }
2074                                         }
2075                                         ++$commonPrefixLength;
2076                                 }
2077                                 $lastPrefix = $prefix2;
2078                         }
2079
2080                         // If we have no prefixes, go to paragraph mode.
2081                         if( 0 == $prefixLength ) {
2082                                 wfProfileIn( __METHOD__."-paragraph" );
2083                                 # No prefix (not in list)--go to paragraph mode
2084                                 // XXX: use a stack for nestable elements like span, table and div
2085                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2086                                 $closematch = preg_match(
2087                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2088                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2089                                 if ( $openmatch or $closematch ) {
2090                                         $paragraphStack = false;
2091                                         # TODO bug 5718: paragraph closed
2092                                         $output .= $this->closeParagraph();
2093                                         if ( $preOpenMatch and !$preCloseMatch ) {
2094                                                 $this->mInPre = true;
2095                                         }
2096                                         if ( $closematch ) {
2097                                                 $inBlockElem = false;
2098                                         } else {
2099                                                 $inBlockElem = true;
2100                                         }
2101                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2102                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2103                                                 // pre
2104                                                 if ($this->mLastSection !== 'pre') {
2105                                                         $paragraphStack = false;
2106                                                         $output .= $this->closeParagraph().'<pre>';
2107                                                         $this->mLastSection = 'pre';
2108                                                 }
2109                                                 $t = substr( $t, 1 );
2110                                         } else {
2111                                                 // paragraph
2112                                                 if ( trim($t) == '' ) {
2113                                                         if ( $paragraphStack ) {
2114                                                                 $output .= $paragraphStack.'<br />';
2115                                                                 $paragraphStack = false;
2116                                                                 $this->mLastSection = 'p';
2117                                                         } else {
2118                                                                 if ($this->mLastSection !== 'p' ) {
2119                                                                         $output .= $this->closeParagraph();
2120                                                                         $this->mLastSection = '';
2121                                                                         $paragraphStack = '<p>';
2122                                                                 } else {
2123                                                                         $paragraphStack = '</p><p>';
2124                                                                 }
2125                                                         }
2126                                                 } else {
2127                                                         if ( $paragraphStack ) {
2128                                                                 $output .= $paragraphStack;
2129                                                                 $paragraphStack = false;
2130                                                                 $this->mLastSection = 'p';
2131                                                         } else if ($this->mLastSection !== 'p') {
2132                                                                 $output .= $this->closeParagraph().'<p>';
2133                                                                 $this->mLastSection = 'p';
2134                                                         }
2135                                                 }
2136                                         }
2137                                 }
2138                                 wfProfileOut( __METHOD__."-paragraph" );
2139                         }
2140                         // somewhere above we forget to get out of pre block (bug 785)
2141                         if($preCloseMatch && $this->mInPre) {
2142                                 $this->mInPre = false;
2143                         }
2144                         if ($paragraphStack === false) {
2145                                 $output .= $t."\n";
2146                         }
2147                 }
2148                 while ( $prefixLength ) {
2149                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2150                         --$prefixLength;
2151                 }
2152                 if ( $this->mLastSection != '' ) {
2153                         $output .= '</' . $this->mLastSection . '>';
2154                         $this->mLastSection = '';
2155                 }
2156
2157                 wfProfileOut( __METHOD__ );
2158                 return $output;
2159         }
2160
2161         /**
2162          * Split up a string on ':', ignoring any occurences inside tags
2163          * to prevent illegal overlapping.
2164          * @param string $str the string to split
2165          * @param string &$before set to everything before the ':'
2166          * @param string &$after set to everything after the ':'
2167          * return string the position of the ':', or false if none found
2168          */
2169         function findColonNoLinks($str, &$before, &$after) {
2170                 wfProfileIn( __METHOD__ );
2171
2172                 $pos = strpos( $str, ':' );
2173                 if( $pos === false ) {
2174                         // Nothing to find!
2175                         wfProfileOut( __METHOD__ );
2176                         return false;
2177                 }
2178
2179                 $lt = strpos( $str, '<' );
2180                 if( $lt === false || $lt > $pos ) {
2181                         // Easy; no tag nesting to worry about
2182                         $before = substr( $str, 0, $pos );
2183                         $after = substr( $str, $pos+1 );
2184                         wfProfileOut( __METHOD__ );
2185                         return $pos;
2186                 }
2187
2188                 // Ugly state machine to walk through avoiding tags.
2189                 $state = self::COLON_STATE_TEXT;
2190                 $stack = 0;
2191                 $len = strlen( $str );
2192                 for( $i = 0; $i < $len; $i++ ) {
2193                         $c = $str{$i};
2194
2195                         switch( $state ) {
2196                         // (Using the number is a performance hack for common cases)
2197                         case 0: // self::COLON_STATE_TEXT:
2198                                 switch( $c ) {
2199                                 case "<":
2200                                         // Could be either a <start> tag or an </end> tag
2201                                         $state = self::COLON_STATE_TAGSTART;
2202                                         break;
2203                                 case ":":
2204                                         if( $stack == 0 ) {
2205                                                 // We found it!
2206                                                 $before = substr( $str, 0, $i );
2207                                                 $after = substr( $str, $i + 1 );
2208                                                 wfProfileOut( __METHOD__ );
2209                                                 return $i;
2210                                         }
2211                                         // Embedded in a tag; don't break it.
2212                                         break;
2213                                 default:
2214                                         // Skip ahead looking for something interesting
2215                                         $colon = strpos( $str, ':', $i );
2216                                         if( $colon === false ) {
2217                                                 // Nothing else interesting
2218                                                 wfProfileOut( __METHOD__ );
2219                                                 return false;
2220                                         }
2221                                         $lt = strpos( $str, '<', $i );
2222                                         if( $stack === 0 ) {
2223                                                 if( $lt === false || $colon < $lt ) {
2224                                                         // We found it!
2225                                                         $before = substr( $str, 0, $colon );
2226                                                         $after = substr( $str, $colon + 1 );
2227                                                         wfProfileOut( __METHOD__ );
2228                                                         return $i;
2229                                                 }
2230                                         }
2231                                         if( $lt === false ) {
2232                                                 // Nothing else interesting to find; abort!
2233                                                 // We're nested, but there's no close tags left. Abort!
2234                                                 break 2;
2235                                         }
2236                                         // Skip ahead to next tag start
2237                                         $i = $lt;
2238                                         $state = self::COLON_STATE_TAGSTART;
2239                                 }
2240                                 break;
2241                         case 1: // self::COLON_STATE_TAG:
2242                                 // In a <tag>
2243                                 switch( $c ) {
2244                                 case ">":
2245                                         $stack++;
2246                                         $state = self::COLON_STATE_TEXT;
2247                                         break;
2248                                 case "/":
2249                                         // Slash may be followed by >?
2250                                         $state = self::COLON_STATE_TAGSLASH;
2251                                         break;
2252                                 default:
2253                                         // ignore
2254                                 }
2255                                 break;
2256                         case 2: // self::COLON_STATE_TAGSTART:
2257                                 switch( $c ) {
2258                                 case "/":
2259                                         $state = self::COLON_STATE_CLOSETAG;
2260                                         break;
2261                                 case "!":
2262                                         $state = self::COLON_STATE_COMMENT;
2263                                         break;
2264                                 case ">":
2265                                         // Illegal early close? This shouldn't happen D:
2266                                         $state = self::COLON_STATE_TEXT;
2267                                         break;
2268                                 default:
2269                                         $state = self::COLON_STATE_TAG;
2270                                 }
2271                                 break;
2272                         case 3: // self::COLON_STATE_CLOSETAG:
2273                                 // In a </tag>
2274                                 if( $c === ">" ) {
2275                                         $stack--;
2276                                         if( $stack < 0 ) {
2277                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2278                                                 wfProfileOut( __METHOD__ );
2279                                                 return false;
2280                                         }
2281                                         $state = self::COLON_STATE_TEXT;
2282                                 }
2283                                 break;
2284                         case self::COLON_STATE_TAGSLASH:
2285                                 if( $c === ">" ) {
2286                                         // Yes, a self-closed tag <blah/>
2287                                         $state = self::COLON_STATE_TEXT;
2288                                 } else {
2289                                         // Probably we're jumping the gun, and this is an attribute
2290                                         $state = self::COLON_STATE_TAG;
2291                                 }
2292                                 break;
2293                         case 5: // self::COLON_STATE_COMMENT:
2294                                 if( $c === "-" ) {
2295                                         $state = self::COLON_STATE_COMMENTDASH;
2296                                 }
2297                                 break;
2298                         case self::COLON_STATE_COMMENTDASH:
2299                                 if( $c === "-" ) {
2300                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2301                                 } else {
2302                                         $state = self::COLON_STATE_COMMENT;
2303                                 }
2304                                 break;
2305                         case self::COLON_STATE_COMMENTDASHDASH:
2306                                 if( $c === ">" ) {
2307                                         $state = self::COLON_STATE_TEXT;
2308                                 } else {
2309                                         $state = self::COLON_STATE_COMMENT;
2310                                 }
2311                                 break;
2312                         default:
2313                                 throw new MWException( "State machine error in " . __METHOD__ );
2314                         }
2315                 }
2316                 if( $stack > 0 ) {
2317                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2318                         return false;
2319                 }
2320                 wfProfileOut( __METHOD__ );
2321                 return false;
2322         }
2323
2324         /**
2325          * Return value of a magic variable (like PAGENAME)
2326          *
2327          * @private
2328          */
2329         function getVariableValue( $index, $frame=false ) {
2330                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2331                 global $wgScriptPath, $wgStylePath;
2332
2333                 /**
2334                  * Some of these require message or data lookups and can be
2335                  * expensive to check many times.
2336                  */
2337                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2338                         if ( isset( $this->mVarCache[$index] ) ) {
2339                                 return $this->mVarCache[$index];
2340                         }
2341                 }
2342
2343                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2344                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2345
2346                 # Use the time zone
2347                 global $wgLocaltimezone;
2348                 if ( isset( $wgLocaltimezone ) ) {
2349                         $oldtz = date_default_timezone_get();
2350                         date_default_timezone_set( $wgLocaltimezone );
2351                 }
2352
2353                 $localTimestamp = date( 'YmdHis', $ts );
2354                 $localMonth = date( 'm', $ts );
2355                 $localMonth1 = date( 'n', $ts );
2356                 $localMonthName = date( 'n', $ts );
2357                 $localDay = date( 'j', $ts );
2358                 $localDay2 = date( 'd', $ts );
2359                 $localDayOfWeek = date( 'w', $ts );
2360                 $localWeek = date( 'W', $ts );
2361                 $localYear = date( 'Y', $ts );
2362                 $localHour = date( 'H', $ts );
2363                 if ( isset( $wgLocaltimezone ) ) {
2364                         date_default_timezone_set( $oldtz );
2365                 }
2366
2367                 switch ( $index ) {
2368                         case 'currentmonth':
2369                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2370                                 break;
2371                         case 'currentmonth1':
2372                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2373                                 break;
2374                         case 'currentmonthname':
2375                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2376                                 break;
2377                         case 'currentmonthnamegen':
2378                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2379                                 break;
2380                         case 'currentmonthabbrev':
2381                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2382                                 break;
2383                         case 'currentday':
2384                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2385                                 break;
2386                         case 'currentday2':
2387                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2388                                 break;
2389                         case 'localmonth':
2390                                 $value = $wgContLang->formatNum( $localMonth );
2391                                 break;
2392                         case 'localmonth1':
2393                                 $value = $wgContLang->formatNum( $localMonth1 );
2394                                 break;
2395                         case 'localmonthname':
2396                                 $value = $wgContLang->getMonthName( $localMonthName );
2397                                 break;
2398                         case 'localmonthnamegen':
2399                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2400                                 break;
2401                         case 'localmonthabbrev':
2402                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2403                                 break;
2404                         case 'localday':
2405                                 $value = $wgContLang->formatNum( $localDay );
2406                                 break;
2407                         case 'localday2':
2408                                 $value = $wgContLang->formatNum( $localDay2 );
2409                                 break;
2410                         case 'pagename':
2411                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2412                                 break;
2413                         case 'pagenamee':
2414                                 $value = $this->mTitle->getPartialURL();
2415                                 break;
2416                         case 'fullpagename':
2417                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2418                                 break;
2419                         case 'fullpagenamee':
2420                                 $value = $this->mTitle->getPrefixedURL();
2421                                 break;
2422                         case 'subpagename':
2423                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2424                                 break;
2425                         case 'subpagenamee':
2426                                 $value = $this->mTitle->getSubpageUrlForm();
2427                                 break;
2428                         case 'basepagename':
2429                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2430                                 break;
2431                         case 'basepagenamee':
2432                                 $value = wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2433                                 break;
2434                         case 'talkpagename':
2435                                 if( $this->mTitle->canTalk() ) {
2436                                         $talkPage = $this->mTitle->getTalkPage();
2437                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2438                                 } else {
2439                                         $value = '';
2440                                 }
2441                                 break;
2442                         case 'talkpagenamee':
2443                                 if( $this->mTitle->canTalk() ) {
2444                                         $talkPage = $this->mTitle->getTalkPage();
2445                                         $value = $talkPage->getPrefixedUrl();
2446                                 } else {
2447                                         $value = '';
2448                                 }
2449                                 break;
2450                         case 'subjectpagename':
2451                                 $subjPage = $this->mTitle->getSubjectPage();
2452                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2453                                 break;
2454                         case 'subjectpagenamee':
2455                                 $subjPage = $this->mTitle->getSubjectPage();
2456                                 $value = $subjPage->getPrefixedUrl();
2457                                 break;
2458                         case 'revisionid':
2459                                 // Let the edit saving system know we should parse the page
2460                                 // *after* a revision ID has been assigned.
2461                                 $this->mOutput->setFlag( 'vary-revision' );
2462                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2463                                 $value = $this->mRevisionId;
2464                                 break;
2465                         case 'revisionday':
2466                                 // Let the edit saving system know we should parse the page
2467                                 // *after* a revision ID has been assigned. This is for null edits.
2468                                 $this->mOutput->setFlag( 'vary-revision' );
2469                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2470                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2471                                 break;
2472                         case 'revisionday2':
2473                                 // Let the edit saving system know we should parse the page
2474                                 // *after* a revision ID has been assigned. This is for null edits.
2475                                 $this->mOutput->setFlag( 'vary-revision' );
2476                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2477                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2478                                 break;
2479                         case 'revisionmonth':
2480                                 // Let the edit saving system know we should parse the page
2481                                 // *after* a revision ID has been assigned. This is for null edits.
2482                                 $this->mOutput->setFlag( 'vary-revision' );
2483                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2484                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2485                                 break;
2486                         case 'revisionyear':
2487                                 // Let the edit saving system know we should parse the page
2488                                 // *after* a revision ID has been assigned. This is for null edits.
2489                                 $this->mOutput->setFlag( 'vary-revision' );
2490                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2491                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2492                                 break;
2493                         case 'revisiontimestamp':
2494                                 // Let the edit saving system know we should parse the page
2495                                 // *after* a revision ID has been assigned. This is for null edits.
2496                                 $this->mOutput->setFlag( 'vary-revision' );
2497                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2498                                 $value = $this->getRevisionTimestamp();
2499                                 break;
2500                         case 'revisionuser':
2501                                 // Let the edit saving system know we should parse the page
2502                                 // *after* a revision ID has been assigned. This is for null edits.
2503                                 $this->mOutput->setFlag( 'vary-revision' );
2504                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2505                                 $value = $this->getRevisionUser();
2506                                 break;
2507                         case 'namespace':
2508                                 $value = str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2509                                 break;
2510                         case 'namespacee':
2511                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2512                                 break;
2513                         case 'talkspace':
2514                                 $value = $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2515                                 break;
2516                         case 'talkspacee':
2517                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2518                                 break;
2519                         case 'subjectspace':
2520                                 $value = $this->mTitle->getSubjectNsText();
2521                                 break;
2522                         case 'subjectspacee':
2523                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2524                                 break;
2525                         case 'currentdayname':
2526                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2527                                 break;
2528                         case 'currentyear':
2529                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2530                                 break;
2531                         case 'currenttime':
2532                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2533                                 break;
2534                         case 'currenthour':
2535                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2536                                 break;
2537                         case 'currentweek':
2538                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2539                                 // int to remove the padding
2540                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2541                                 break;
2542                         case 'currentdow':
2543                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2544                                 break;
2545                         case 'localdayname':
2546                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2547                                 break;
2548                         case 'localyear':
2549                                 $value = $wgContLang->formatNum( $localYear, true );
2550                                 break;
2551                         case 'localtime':
2552                                 $value = $wgContLang->time( $localTimestamp, false, false );
2553                                 break;
2554                         case 'localhour':
2555                                 $value = $wgContLang->formatNum( $localHour, true );
2556                                 break;
2557                         case 'localweek':
2558                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2559                                 // int to remove the padding
2560                                 $value = $wgContLang->formatNum( (int)$localWeek );
2561                                 break;
2562                         case 'localdow':
2563                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2564                                 break;
2565                         case 'numberofarticles':
2566                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2567                                 break;
2568                         case 'numberoffiles':
2569                                 $value = $wgContLang->formatNum( SiteStats::images() );
2570                                 break;
2571                         case 'numberofusers':
2572                                 $value = $wgContLang->formatNum( SiteStats::users() );
2573                                 break;
2574                         case 'numberofactiveusers':
2575                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2576                                 break;
2577                         case 'numberofpages':
2578                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2579                                 break;
2580                         case 'numberofadmins':
2581                                 $value = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2582                                 break;
2583                         case 'numberofedits':
2584                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2585                                 break;
2586                         case 'numberofviews':
2587                                 $value = $wgContLang->formatNum( SiteStats::views() );
2588                                 break;
2589                         case 'currenttimestamp':
2590                                 $value = wfTimestamp( TS_MW, $ts );
2591                                 break;
2592                         case 'localtimestamp':
2593                                 $value = $localTimestamp;
2594                                 break;
2595                         case 'currentversion':
2596                                 $value = SpecialVersion::getVersion();
2597                                 break;
2598                         case 'sitename':
2599                                 return $wgSitename;
2600                         case 'server':
2601                                 return $wgServer;
2602                         case 'servername':
2603                                 return $wgServerName;
2604                         case 'scriptpath':
2605                                 return $wgScriptPath;
2606                         case 'stylepath':
2607                                 return $wgStylePath;
2608                         case 'directionmark':
2609                                 return $wgContLang->getDirMark();
2610                         case 'contentlanguage':
2611                                 global $wgContLanguageCode;
2612                                 return $wgContLanguageCode;
2613                         default:
2614                                 $ret = null;
2615                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) )
2616                                         return $ret;
2617                                 else
2618                                         return null;
2619                 }
2620
2621                 if ( $index )
2622                         $this->mVarCache[$index] = $value;
2623
2624                 return $value;
2625         }
2626
2627         /**
2628          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2629          *
2630          * @private
2631          */
2632         function initialiseVariables() {
2633                 wfProfileIn( __METHOD__ );
2634                 $variableIDs = MagicWord::getVariableIDs();
2635                 $substIDs = MagicWord::getSubstIDs();
2636
2637                 $this->mVariables = new MagicWordArray( $variableIDs );
2638                 $this->mSubsts = new MagicWordArray( $substIDs );
2639                 wfProfileOut( __METHOD__ );
2640         }
2641
2642         /**
2643          * Preprocess some wikitext and return the document tree.
2644          * This is the ghost of replace_variables().
2645          *
2646          * @param string $text The text to parse
2647          * @param integer flags Bitwise combination of:
2648          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2649          *                                     included. Default is to assume a direct page view.
2650          *
2651          * The generated DOM tree must depend only on the input text and the flags.
2652          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2653          *
2654          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2655          * change in the DOM tree for a given text, must be passed through the section identifier
2656          * in the section edit link and thus back to extractSections().
2657          *
2658          * The output of this function is currently only cached in process memory, but a persistent
2659          * cache may be implemented at a later date which takes further advantage of these strict
2660          * dependency requirements.
2661          *
2662          * @private
2663          */
2664         function preprocessToDom ( $text, $flags = 0 ) {
2665                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2666                 return $dom;
2667         }
2668
2669         /*
2670          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2671          */
2672         public static function splitWhitespace( $s ) {
2673                 $ltrimmed = ltrim( $s );
2674                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2675                 $trimmed = rtrim( $ltrimmed );
2676                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2677                 if ( $diff > 0 ) {
2678                         $w2 = substr( $ltrimmed, -$diff );
2679                 } else {
2680                         $w2 = '';
2681                 }
2682                 return array( $w1, $trimmed, $w2 );
2683         }
2684
2685         /**
2686          * Replace magic variables, templates, and template arguments
2687          * with the appropriate text. Templates are substituted recursively,
2688          * taking care to avoid infinite loops.
2689          *
2690          * Note that the substitution depends on value of $mOutputType:
2691          *  self::OT_WIKI: only {{subst:}} templates
2692          *  self::OT_PREPROCESS: templates but not extension tags
2693          *  self::OT_HTML: all templates and extension tags
2694          *
2695          * @param string $tex The text to transform
2696          * @param PPFrame $frame Object describing the arguments passed to the template.
2697          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2698          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2699          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2700          * @private
2701          */
2702         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2703                 # Is there any text? Also, Prevent too big inclusions!
2704                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2705                         return $text;
2706                 }
2707                 wfProfileIn( __METHOD__ );
2708
2709                 if ( $frame === false ) {
2710                         $frame = $this->getPreprocessor()->newFrame();
2711                 } elseif ( !( $frame instanceof PPFrame ) ) {
2712                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2713                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2714                 }
2715
2716                 $dom = $this->preprocessToDom( $text );
2717                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2718                 $text = $frame->expand( $dom, $flags );
2719
2720                 wfProfileOut( __METHOD__ );
2721                 return $text;
2722         }
2723
2724         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2725         static function createAssocArgs( $args ) {
2726                 $assocArgs = array();
2727                 $index = 1;
2728                 foreach( $args as $arg ) {
2729                         $eqpos = strpos( $arg, '=' );
2730                         if ( $eqpos === false ) {
2731                                 $assocArgs[$index++] = $arg;
2732                         } else {
2733                                 $name = trim( substr( $arg, 0, $eqpos ) );
2734                                 $value = trim( substr( $arg, $eqpos+1 ) );
2735                                 if ( $value === false ) {
2736                                         $value = '';
2737                                 }
2738                                 if ( $name !== false ) {
2739                                         $assocArgs[$name] = $value;
2740                                 }
2741                         }
2742                 }
2743
2744                 return $assocArgs;
2745         }
2746
2747         /**
2748          * Warn the user when a parser limitation is reached
2749          * Will warn at most once the user per limitation type
2750          *
2751          * @param string $limitationType, should be one of:
2752          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2753          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2754          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2755          * @params int $current, $max When an explicit limit has been
2756          *       exceeded, provide the values (optional)
2757          */
2758         function limitationWarn( $limitationType, $current=null, $max=null) {
2759                 //does no harm if $current and $max are present but are unnecessary for the message
2760                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2761                 $this->mOutput->addWarning( $warning );
2762                 $this->addTrackingCategory( "$limitationType-category" );
2763         }
2764
2765         /**
2766          * Return the text of a template, after recursively
2767          * replacing any variables or templates within the template.
2768          *
2769          * @param array $piece The parts of the template
2770          *  $piece['title']: the title, i.e. the part before the |
2771          *  $piece['parts']: the parameter array
2772          *  $piece['lineStart']: whether the brace was at the start of a line
2773          * @param PPFrame The current frame, contains template arguments
2774          * @return string the text of the template
2775          * @private
2776          */
2777         function braceSubstitution( $piece, $frame ) {
2778                 global $wgContLang, $wgNonincludableNamespaces;
2779                 wfProfileIn( __METHOD__ );
2780                 wfProfileIn( __METHOD__.'-setup' );
2781
2782                 # Flags
2783                 $found = false;             # $text has been filled
2784                 $nowiki = false;            # wiki markup in $text should be escaped
2785                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2786                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2787                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2788                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2789
2790                 # Title object, where $text came from
2791                 $title = null;
2792
2793                 # $part1 is the bit before the first |, and must contain only title characters.
2794                 # Various prefixes will be stripped from it later.
2795                 $titleWithSpaces = $frame->expand( $piece['title'] );
2796                 $part1 = trim( $titleWithSpaces );
2797                 $titleText = false;
2798
2799                 # Original title text preserved for various purposes
2800                 $originalTitle = $part1;
2801
2802                 # $args is a list of argument nodes, starting from index 0, not including $part1
2803                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2804                 wfProfileOut( __METHOD__.'-setup' );
2805
2806                 # SUBST
2807                 wfProfileIn( __METHOD__.'-modifiers' );
2808                 if ( !$found ) {
2809
2810                         $substMatch = $this->mSubsts->matchStartAndRemove( $part1 );
2811
2812                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
2813                         # Whether to include depends also on whether we are in the pre-save-transform
2814                         #
2815                         # safesubst || (subst && PST) || (false && !PST) => transclude (skip the if)
2816                         # (false && PST) || (subst && !PST)  => return input (handled by if)
2817                         if ( $substMatch != 'safesubst' && ($substMatch == 'subst' xor $this->ot['wiki']) ) {
2818                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2819                                 $isLocalObj = true;
2820                                 $found = true;
2821                         }
2822                 }
2823
2824                 # Variables
2825                 if ( !$found && $args->getLength() == 0 ) {
2826                         $id = $this->mVariables->matchStartToEnd( $part1 );
2827                         if ( $id !== false ) {
2828                                 $text = $this->getVariableValue( $id, $frame );
2829                                 if (MagicWord::getCacheTTL($id)>-1)
2830                                         $this->mOutput->mContainsOldMagic = true;
2831                                 $found = true;
2832                         }
2833                 }
2834
2835                 # MSG, MSGNW and RAW
2836                 if ( !$found ) {
2837                         # Check for MSGNW:
2838                         $mwMsgnw = MagicWord::get( 'msgnw' );
2839                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2840                                 $nowiki = true;
2841                         } else {
2842                                 # Remove obsolete MSG:
2843                                 $mwMsg = MagicWord::get( 'msg' );
2844                                 $mwMsg->matchStartAndRemove( $part1 );
2845                         }
2846
2847                         # Check for RAW:
2848                         $mwRaw = MagicWord::get( 'raw' );
2849                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2850                                 $forceRawInterwiki = true;
2851                         }
2852                 }
2853                 wfProfileOut( __METHOD__.'-modifiers' );
2854
2855                 # Parser functions
2856                 if ( !$found ) {
2857                         wfProfileIn( __METHOD__ . '-pfunc' );
2858
2859                         $colonPos = strpos( $part1, ':' );
2860                         if ( $colonPos !== false ) {
2861                                 # Case sensitive functions
2862                                 $function = substr( $part1, 0, $colonPos );
2863                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2864                                         $function = $this->mFunctionSynonyms[1][$function];
2865                                 } else {
2866                                         # Case insensitive functions
2867                                         $function = $wgContLang->lc( $function );
2868                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2869                                                 $function = $this->mFunctionSynonyms[0][$function];
2870                                         } else {
2871                                                 $function = false;
2872                                         }
2873                                 }
2874                                 if ( $function ) {
2875                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2876                                         $initialArgs = array( &$this );
2877                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2878                                         if ( $flags & SFH_OBJECT_ARGS ) {
2879                                                 # Add a frame parameter, and pass the arguments as an array
2880                                                 $allArgs = $initialArgs;
2881                                                 $allArgs[] = $frame;
2882                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2883                                                         $funcArgs[] = $args->item( $i );
2884                                                 }
2885                                                 $allArgs[] = $funcArgs;
2886                                         } else {
2887                                                 # Convert arguments to plain text
2888                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2889                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2890                                                 }
2891                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2892                                         }
2893
2894                                         # Workaround for PHP bug 35229 and similar
2895                                         if ( !is_callable( $callback ) ) {
2896                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2897                                                 wfProfileOut( __METHOD__ );
2898                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2899                                         }
2900                                         $result = call_user_func_array( $callback, $allArgs );
2901                                         $found = true;
2902                                         $noparse = true;
2903                                         $preprocessFlags = 0;
2904
2905                                         if ( is_array( $result ) ) {
2906                                                 if ( isset( $result[0] ) ) {
2907                                                         $text = $result[0];
2908                                                         unset( $result[0] );
2909                                                 }
2910
2911                                                 // Extract flags into the local scope
2912                                                 // This allows callers to set flags such as nowiki, found, etc.
2913                                                 extract( $result );
2914                                         } else {
2915                                                 $text = $result;
2916                                         }
2917                                         if ( !$noparse ) {
2918                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2919                                                 $isChildObj = true;
2920                                         }
2921                                 }
2922                         }
2923                         wfProfileOut( __METHOD__ . '-pfunc' );
2924                 }
2925
2926                 # Finish mangling title and then check for loops.
2927                 # Set $title to a Title object and $titleText to the PDBK
2928                 if ( !$found ) {
2929                         $ns = NS_TEMPLATE;
2930                         # Split the title into page and subpage
2931                         $subpage = '';
2932                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2933                         if ($subpage !== '') {
2934                                 $ns = $this->mTitle->getNamespace();
2935                         }
2936                         $title = Title::newFromText( $part1, $ns );
2937                         if ( $title ) {
2938                                 $titleText = $title->getPrefixedText();
2939                                 # Check for language variants if the template is not found
2940                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2941                                         $wgContLang->findVariantLink( $part1, $title, true );
2942                                 }
2943                                 # Do recursion depth check
2944                                 $limit = $this->mOptions->getMaxTemplateDepth();
2945                                 if ( $frame->depth >= $limit ) {
2946                                         $found = true;
2947                                         $text = '<span class="error">' . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit ) . '</span>';
2948                                 }
2949                         }
2950                 }
2951
2952                 # Load from database
2953                 if ( !$found && $title ) {
2954                         wfProfileIn( __METHOD__ . '-loadtpl' );
2955                         if ( !$title->isExternal() ) {
2956                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2957                                         $text = SpecialPage::capturePath( $title );
2958                                         if ( is_string( $text ) ) {
2959                                                 $found = true;
2960                                                 $isHTML = true;
2961                                                 $this->disableCache();
2962                                         }
2963                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2964                                         $found = false; //access denied
2965                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2966                                 } else {
2967                                         list( $text, $title ) = $this->getTemplateDom( $title );
2968                                         if ( $text !== false ) {
2969                                                 $found = true;
2970                                                 $isChildObj = true;
2971                                         }
2972                                 }
2973
2974                                 # If the title is valid but undisplayable, make a link to it
2975                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2976                                         $text = "[[:$titleText]]";
2977                                         $found = true;
2978                                 }
2979                         } elseif ( $title->isTrans() ) {
2980                                 // Interwiki transclusion
2981                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2982                                         $text = $this->interwikiTransclude( $title, 'render' );
2983                                         $isHTML = true;
2984                                 } else {
2985                                         $text = $this->interwikiTransclude( $title, 'raw' );
2986                                         // Preprocess it like a template
2987                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2988                                         $isChildObj = true;
2989                                 }
2990                                 $found = true;
2991                         }
2992
2993                         # Do infinite loop check
2994                         # This has to be done after redirect resolution to avoid infinite loops via redirects
2995                         if ( !$frame->loopCheck( $title ) ) {
2996                                 $found = true;
2997                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
2998                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2999                         }
3000                         wfProfileOut( __METHOD__ . '-loadtpl' );
3001                 }
3002
3003                 # If we haven't found text to substitute by now, we're done
3004                 # Recover the source wikitext and return it
3005                 if ( !$found ) {
3006                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3007                         wfProfileOut( __METHOD__ );
3008                         return array( 'object' => $text );
3009                 }
3010
3011                 # Expand DOM-style return values in a child frame
3012                 if ( $isChildObj ) {
3013                         # Clean up argument array
3014                         $newFrame = $frame->newChild( $args, $title );
3015
3016                         if ( $nowiki ) {
3017                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3018                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3019                                 # Expansion is eligible for the empty-frame cache
3020                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3021                                         $text = $this->mTplExpandCache[$titleText];
3022                                 } else {
3023                                         $text = $newFrame->expand( $text );
3024                                         $this->mTplExpandCache[$titleText] = $text;
3025                                 }
3026                         } else {
3027                                 # Uncached expansion
3028                                 $text = $newFrame->expand( $text );
3029                         }
3030                 }
3031                 if ( $isLocalObj && $nowiki ) {
3032                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3033                         $isLocalObj = false;
3034                 }
3035
3036                 # Replace raw HTML by a placeholder
3037                 # Add a blank line preceding, to prevent it from mucking up
3038                 # immediately preceding headings
3039                 if ( $isHTML ) {
3040                         $text = "\n\n" . $this->insertStripItem( $text );
3041                 }
3042                 # Escape nowiki-style return values
3043                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3044                         $text = wfEscapeWikiText( $text );
3045                 }
3046                 # Bug 529: if the template begins with a table or block-level
3047                 # element, it should be treated as beginning a new line.
3048                 # This behaviour is somewhat controversial.
3049                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3050                         $text = "\n" . $text;
3051                 }
3052
3053                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3054                         # Error, oversize inclusion
3055                         $text = "[[$originalTitle]]" .
3056                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3057                         $this->limitationWarn( 'post-expand-template-inclusion' );
3058                 }
3059
3060                 if ( $isLocalObj ) {
3061                         $ret = array( 'object' => $text );
3062                 } else {
3063                         $ret = array( 'text' => $text );
3064                 }
3065
3066                 wfProfileOut( __METHOD__ );
3067                 return $ret;
3068         }
3069
3070         /**
3071          * Get the semi-parsed DOM representation of a template with a given title,
3072          * and its redirect destination title. Cached.
3073          */
3074         function getTemplateDom( $title ) {
3075                 $cacheTitle = $title;
3076                 $titleText = $title->getPrefixedDBkey();
3077
3078                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3079                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3080                         $title = Title::makeTitle( $ns, $dbk );
3081                         $titleText = $title->getPrefixedDBkey();
3082                 }
3083                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3084                         return array( $this->mTplDomCache[$titleText], $title );
3085                 }
3086
3087                 // Cache miss, go to the database
3088                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3089
3090                 if ( $text === false ) {
3091                         $this->mTplDomCache[$titleText] = false;
3092                         return array( false, $title );
3093                 }
3094
3095                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3096                 $this->mTplDomCache[ $titleText ] = $dom;
3097
3098                 if (! $title->equals($cacheTitle)) {
3099                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3100                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3101                 }
3102
3103                 return array( $dom, $title );
3104         }
3105
3106         /**
3107          * Fetch the unparsed text of a template and register a reference to it.
3108          */
3109         function fetchTemplateAndTitle( $title ) {
3110                 $templateCb = $this->mOptions->getTemplateCallback();
3111                 $stuff = call_user_func( $templateCb, $title, $this );
3112                 $text = $stuff['text'];
3113                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3114                 if ( isset( $stuff['deps'] ) ) {
3115                         foreach ( $stuff['deps'] as $dep ) {
3116                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3117                         }
3118                 }
3119                 return array($text,$finalTitle);
3120         }
3121
3122         function fetchTemplate( $title ) {
3123                 $rv = $this->fetchTemplateAndTitle($title);
3124                 return $rv[0];
3125         }
3126
3127         /**
3128          * Static function to get a template
3129          * Can be overridden via ParserOptions::setTemplateCallback().
3130          */
3131         static function statelessFetchTemplate( $title, $parser=false ) {
3132                 $text = $skip = false;
3133                 $finalTitle = $title;
3134                 $deps = array();
3135
3136                 // Loop to fetch the article, with up to 1 redirect
3137                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3138                         # Give extensions a chance to select the revision instead
3139                         $id = false; // Assume current
3140                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3141
3142                         if( $skip ) {
3143                                 $text = false;
3144                                 $deps[] = array(
3145                                         'title' => $title,
3146                                         'page_id' => $title->getArticleID(),
3147                                         'rev_id' => null );
3148                                 break;
3149                         }
3150                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3151                         $rev_id = $rev ? $rev->getId() : 0;
3152                         // If there is no current revision, there is no page
3153                         if( $id === false && !$rev ) {
3154                                 $linkCache = LinkCache::singleton();
3155                                 $linkCache->addBadLinkObj( $title );
3156                         }
3157
3158                         $deps[] = array(
3159                                 'title' => $title,
3160                                 'page_id' => $title->getArticleID(),
3161                                 'rev_id' => $rev_id );
3162
3163                         if( $rev ) {
3164                                 $text = $rev->getText();
3165                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3166                                 global $wgContLang;
3167                                 $message = $wgContLang->lcfirst( $title->getText() );
3168                                 $text = wfMsgForContentNoTrans( $message );
3169                                 if( wfEmptyMsg( $message, $text ) ) {
3170                                         $text = false;
3171                                         break;
3172                                 }
3173                         } else {
3174                                 break;
3175                         }
3176                         if ( $text === false ) {
3177                                 break;
3178                         }
3179                         // Redirect?
3180                         $finalTitle = $title;
3181                         $title = Title::newFromRedirect( $text );
3182                 }
3183                 return array(
3184                         'text' => $text,
3185                         'finalTitle' => $finalTitle,
3186                         'deps' => $deps );
3187         }
3188
3189         /**
3190          * Transclude an interwiki link.
3191          */
3192         function interwikiTransclude( $title, $action ) {
3193                 global $wgEnableScaryTranscluding;
3194
3195                 if (!$wgEnableScaryTranscluding)
3196                         return wfMsg('scarytranscludedisabled');
3197
3198                 $url = $title->getFullUrl( "action=$action" );
3199
3200                 if (strlen($url) > 255)
3201                         return wfMsg('scarytranscludetoolong');
3202                 return $this->fetchScaryTemplateMaybeFromCache($url);
3203         }
3204
3205         function fetchScaryTemplateMaybeFromCache($url) {
3206                 global $wgTranscludeCacheExpiry;
3207                 $dbr = wfGetDB(DB_SLAVE);
3208                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3209                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3210                                 array('tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3211                 if ($obj) {
3212                         return $obj->tc_contents;
3213                 }
3214
3215                 $text = Http::get($url);
3216                 if (!$text)
3217                         return wfMsg('scarytranscludefailed', $url);
3218
3219                 $dbw = wfGetDB(DB_MASTER);
3220                 $dbw->replace('transcache', array('tc_url'), array(
3221                         'tc_url' => $url,
3222                         'tc_time' => $dbw->timestamp( time() ),
3223                         'tc_contents' => $text));
3224                 return $text;
3225         }
3226
3227
3228         /**
3229          * Triple brace replacement -- used for template arguments
3230          * @private
3231          */
3232         function argSubstitution( $piece, $frame ) {
3233                 wfProfileIn( __METHOD__ );
3234
3235                 $error = false;
3236                 $parts = $piece['parts'];
3237                 $nameWithSpaces = $frame->expand( $piece['title'] );
3238                 $argName = trim( $nameWithSpaces );
3239                 $object = false;
3240                 $text = $frame->getArgument( $argName );
3241                 if (  $text === false && $parts->getLength() > 0
3242                   && (
3243                     $this->ot['html']
3244                     || $this->ot['pre']
3245                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3246                   )
3247                 ) {
3248                         # No match in frame, use the supplied default
3249                         $object = $parts->item( 0 )->getChildren();
3250                 }
3251                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3252                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3253                         $this->limitationWarn( 'post-expand-template-argument' );
3254                 }
3255
3256                 if ( $text === false && $object === false ) {
3257                         # No match anywhere
3258                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3259                 }
3260                 if ( $error !== false ) {
3261                         $text .= $error;
3262                 }
3263                 if ( $object !== false ) {
3264                         $ret = array( 'object' => $object );
3265                 } else {
3266                         $ret = array( 'text' => $text );
3267                 }
3268
3269                 wfProfileOut( __METHOD__ );
3270                 return $ret;
3271         }
3272
3273         /**
3274          * Return the text to be used for a given extension tag.
3275          * This is the ghost of strip().
3276          *
3277          * @param array $params Associative array of parameters:
3278          *     name       PPNode for the tag name
3279          *     attr       PPNode for unparsed text where tag attributes are thought to be
3280          *     attributes Optional associative array of parsed attributes
3281          *     inner      Contents of extension element
3282          *     noClose    Original text did not have a close tag
3283          * @param PPFrame $frame
3284          */
3285         function extensionSubstitution( $params, $frame ) {
3286                 global $wgRawHtml, $wgContLang;
3287
3288                 $name = $frame->expand( $params['name'] );
3289                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3290                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3291                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3292
3293                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3294                         ( $this->ot['html'] || $this->ot['pre'] );
3295                 if ( $isFunctionTag ) {
3296                         $markerType = 'none';
3297                 } else {
3298                         $markerType = 'general';
3299                 }
3300                 if ( $this->ot['html'] || $isFunctionTag ) {
3301                         $name = strtolower( $name );
3302                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3303                         if ( isset( $params['attributes'] ) ) {
3304                                 $attributes = $attributes + $params['attributes'];
3305                         }
3306
3307                         if( isset( $this->mTagHooks[$name] ) ) {
3308                                 # Workaround for PHP bug 35229 and similar
3309                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3310                                         throw new MWException( "Tag hook for $name is not callable\n" );
3311                                 }
3312                                 $output = call_user_func_array( $this->mTagHooks[$name],
3313                                         array( $content, $attributes, $this, $frame ) );
3314                         } elseif( isset( $this->mFunctionTagHooks[$name] ) ) {
3315                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3316                                 if( !is_callable( $callback ) )
3317                                         throw new MWException( "Tag hook for $name is not callable\n" );
3318
3319                                 $output = call_user_func_array( $callback,
3320                                         array( &$this, $frame, $content, $attributes ) );
3321                         } else {
3322                                 $output = '<span class="error">Invalid tag extension name: ' .
3323                                         htmlspecialchars( $name ) . '</span>';
3324                         }
3325
3326                         if ( is_array( $output ) ) {
3327                                 // Extract flags to local scope (to override $markerType)
3328                                 $flags = $output;
3329                                 $output = $flags[0];
3330                                 unset( $flags[0] );
3331                                 extract( $flags );
3332                         }
3333                 } else {
3334                         if ( is_null( $attrText ) ) {
3335                                 $attrText = '';
3336                         }
3337                         if ( isset( $params['attributes'] ) ) {
3338                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3339                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3340                                                 htmlspecialchars( $attrValue ) . '"';
3341                                 }
3342                         }
3343                         if ( $content === null ) {
3344                                 $output = "<$name$attrText/>";
3345                         } else {
3346                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3347                                 $output = "<$name$attrText>$content$close";
3348                         }
3349                 }
3350
3351                 if( $markerType === 'none' ) {
3352                         return $output;
3353                 } elseif ( $markerType === 'nowiki' ) {
3354                         $this->mStripState->nowiki->setPair( $marker, $output );
3355                 } elseif ( $markerType === 'general' ) {
3356                         $this->mStripState->general->setPair( $marker, $output );
3357                 } else {
3358                         throw new MWException( __METHOD__.': invalid marker type' );
3359                 }
3360                 return $marker;
3361         }
3362
3363         /**
3364          * Increment an include size counter
3365          *
3366          * @param string $type The type of expansion
3367          * @param integer $size The size of the text
3368          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3369          */
3370         function incrementIncludeSize( $type, $size ) {
3371                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3372                         return false;
3373                 } else {
3374                         $this->mIncludeSizes[$type] += $size;
3375                         return true;
3376                 }
3377         }
3378
3379         /**
3380          * Increment the expensive function count
3381          *
3382          * @return boolean False if the limit has been exceeded
3383          */
3384         function incrementExpensiveFunctionCount() {
3385                 global $wgExpensiveParserFunctionLimit;
3386                 $this->mExpensiveFunctionCount++;
3387                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3388                         return true;
3389                 }
3390                 return false;
3391         }
3392
3393         /**
3394          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3395          * Fills $this->mDoubleUnderscores, returns the modified text
3396          */
3397         function doDoubleUnderscore( $text ) {
3398                 wfProfileIn( __METHOD__ );
3399
3400                 // The position of __TOC__ needs to be recorded
3401                 $mw = MagicWord::get( 'toc' );
3402                 if( $mw->match( $text ) ) {
3403                         $this->mShowToc = true;
3404                         $this->mForceTocPosition = true;
3405
3406                         // Set a placeholder. At the end we'll fill it in with the TOC.
3407                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3408
3409                         // Only keep the first one.
3410                         $text = $mw->replace( '', $text );
3411                 }
3412
3413                 // Now match and remove the rest of them
3414                 $mwa = MagicWord::getDoubleUnderscoreArray();
3415                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3416
3417                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3418                         $this->mOutput->mNoGallery = true;
3419                 }
3420                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3421                         $this->mShowToc = false;
3422                 }
3423                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3424                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3425                         $this->addTrackingCategory( 'hidden-category-category' );
3426                 }
3427                 # (bug 8068) Allow control over whether robots index a page.
3428                 #
3429                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3430                 # is not desirable, the last one on the page should win.
3431                 if( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3432                         $this->mOutput->setIndexPolicy( 'noindex' );
3433                         $this->addTrackingCategory( 'noindex-category' );
3434                 }
3435                 if( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ){
3436                         $this->mOutput->setIndexPolicy( 'index' );
3437                         $this->addTrackingCategory( 'index-category' );
3438                 }
3439
3440                 wfProfileOut( __METHOD__ );
3441                 return $text;
3442         }
3443
3444         /**
3445          * Add a tracking category, getting the title from a system message,
3446          * or print a debug message if the title is invalid.
3447          * @param $msg String message key
3448          * @return Bool whether the addition was successful
3449          */
3450         protected function addTrackingCategory( $msg ){
3451                 $cat = wfMsgForContent( $msg );
3452
3453                 # Allow tracking categories to be disabled by setting them to "-"
3454                 if( $cat === '-' ) return false;
3455
3456                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3457                 if ( $containerCategory ) {
3458                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3459                         return true;
3460                 } else {
3461                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3462                         return false;
3463                 }
3464         }
3465
3466         /**
3467          * This function accomplishes several tasks:
3468          * 1) Auto-number headings if that option is enabled
3469          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3470          * 3) Add a Table of contents on the top for users who have enabled the option
3471          * 4) Auto-anchor headings
3472          *
3473          * It loops through all headlines, collects the necessary data, then splits up the
3474          * string and re-inserts the newly formatted headlines.
3475          *
3476          * @param string $text
3477          * @param string $origText Original, untouched wikitext
3478          * @param boolean $isMain
3479          * @private
3480          */
3481         function formatHeadings( $text, $origText, $isMain=true ) {
3482                 global $wgMaxTocLevel, $wgContLang, $wgHtml5, $wgExperimentalHtmlIds;
3483
3484                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3485                 $showEditLink = $this->mOptions->getEditSection();
3486
3487                 // Do not call quickUserCan unless necessary
3488                 if( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3489                         $showEditLink = 0;
3490                 }
3491
3492                 # Inhibit editsection links if requested in the page
3493                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3494                         $showEditLink = 0;
3495                 }
3496
3497                 # Get all headlines for numbering them and adding funky stuff like [edit]
3498                 # links - this is for later, but we need the number of headlines right now
3499                 $matches = array();
3500                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3501
3502                 # if there are fewer than 4 headlines in the article, do not show TOC
3503                 # unless it's been explicitly enabled.
3504                 $enoughToc = $this->mShowToc &&
3505                         (($numMatches >= 4) || $this->mForceTocPosition);
3506
3507                 # Allow user to stipulate that a page should have a "new section"
3508                 # link added via __NEWSECTIONLINK__
3509                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3510                         $this->mOutput->setNewSection( true );
3511                 }
3512
3513                 # Allow user to remove the "new section"
3514                 # link via __NONEWSECTIONLINK__
3515                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3516                         $this->mOutput->hideNewSection( true );
3517                 }
3518
3519                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3520                 # override above conditions and always show TOC above first header
3521                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3522                         $this->mShowToc = true;
3523                         $enoughToc = true;
3524                 }
3525
3526                 # We need this to perform operations on the HTML
3527                 $sk = $this->mOptions->getSkin();
3528
3529                 # headline counter
3530                 $headlineCount = 0;
3531                 $numVisible = 0;
3532
3533                 # Ugh .. the TOC should have neat indentation levels which can be
3534                 # passed to the skin functions. These are determined here
3535                 $toc = '';
3536                 $full = '';
3537                 $head = array();
3538                 $sublevelCount = array();
3539                 $levelCount = array();
3540                 $toclevel = 0;
3541                 $level = 0;
3542                 $prevlevel = 0;
3543                 $toclevel = 0;
3544                 $prevtoclevel = 0;
3545                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3546                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3547                 $oldType = $this->mOutputType;
3548                 $this->setOutputType( self::OT_WIKI );
3549                 $frame = $this->getPreprocessor()->newFrame();
3550                 $root = $this->preprocessToDom( $origText );
3551                 $node = $root->getFirstChild();
3552                 $byteOffset = 0;
3553                 $tocraw = array();
3554
3555                 foreach( $matches[3] as $headline ) {
3556                         $isTemplate = false;
3557                         $titleText = false;
3558                         $sectionIndex = false;
3559                         $numbering = '';
3560                         $markerMatches = array();
3561                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3562                                 $serial = $markerMatches[1];
3563                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3564                                 $isTemplate = ($titleText != $baseTitleText);
3565                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3566                         }
3567
3568                         if( $toclevel ) {
3569                                 $prevlevel = $level;
3570                                 $prevtoclevel = $toclevel;
3571                         }
3572                         $level = $matches[1][$headlineCount];
3573
3574                         if ( $level > $prevlevel ) {
3575                                 # Increase TOC level
3576                                 $toclevel++;
3577                                 $sublevelCount[$toclevel] = 0;
3578                                 if( $toclevel<$wgMaxTocLevel ) {
3579                                         $prevtoclevel = $toclevel;
3580                                         $toc .= $sk->tocIndent();
3581                                         $numVisible++;
3582                                 }
3583                         }
3584                         elseif ( $level < $prevlevel && $toclevel > 1 ) {
3585                                 # Decrease TOC level, find level to jump to
3586
3587                                 for ($i = $toclevel; $i > 0; $i--) {
3588                                         if ( $levelCount[$i] == $level ) {
3589                                                 # Found last matching level
3590                                                 $toclevel = $i;
3591                                                 break;
3592                                         }
3593                                         elseif ( $levelCount[$i] < $level ) {
3594                                                 # Found first matching level below current level
3595                                                 $toclevel = $i + 1;
3596                                                 break;
3597                                         }
3598                                 }
3599                                 if( $i == 0 ) $toclevel = 1;
3600                                 if( $toclevel<$wgMaxTocLevel ) {
3601                                         if($prevtoclevel < $wgMaxTocLevel) {
3602                                                 # Unindent only if the previous toc level was shown :p
3603                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3604                                                 $prevtoclevel = $toclevel;
3605                                         } else {
3606                                                 $toc .= $sk->tocLineEnd();
3607                                         }
3608                                 }
3609                         }
3610                         else {
3611                                 # No change in level, end TOC line
3612                                 if( $toclevel<$wgMaxTocLevel ) {
3613                                         $toc .= $sk->tocLineEnd();
3614                                 }
3615                         }
3616
3617                         $levelCount[$toclevel] = $level;
3618
3619                         # count number of headlines for each level
3620                         @$sublevelCount[$toclevel]++;
3621                         $dot = 0;
3622                         for( $i = 1; $i <= $toclevel; $i++ ) {
3623                                 if( !empty( $sublevelCount[$i] ) ) {
3624                                         if( $dot ) {
3625                                                 $numbering .= '.';
3626                                         }
3627                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3628                                         $dot = 1;
3629                                 }
3630                         }
3631
3632                         # The safe header is a version of the header text safe to use for links
3633                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3634                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3635
3636                         # Remove link placeholders by the link text.
3637                         #     <!--LINK number-->
3638                         # turns into
3639                         #     link text with suffix
3640                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3641
3642                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3643                         $tocline = preg_replace(
3644                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3645                                 array( '',                          '<$1>'),
3646                                 $safeHeadline
3647                         );
3648                         $tocline = trim( $tocline );
3649
3650                         # For the anchor, strip out HTML-y stuff period
3651                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3652                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3653                         $safeHeadline = trim( $safeHeadline );
3654
3655                         # Save headline for section edit hint before it's escaped
3656                         $headlineHint = $safeHeadline;
3657
3658                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
3659                                 # For reverse compatibility, provide an id that's
3660                                 # HTML4-compatible, like we used to.
3661                                 #
3662                                 # It may be worth noting, academically, that it's possible for
3663                                 # the legacy anchor to conflict with a non-legacy headline
3664                                 # anchor on the page.  In this case likely the "correct" thing
3665                                 # would be to either drop the legacy anchors or make sure
3666                                 # they're numbered first.  However, this would require people
3667                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3668                                 # manually, so let's not bother worrying about it.
3669                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3670                                         array( 'noninitial', 'legacy' ) );
3671                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3672
3673                                 if ( $legacyHeadline == $safeHeadline ) {
3674                                         # No reason to have both (in fact, we can't)
3675                                         $legacyHeadline = false;
3676                                 }
3677                         } else {
3678                                 $legacyHeadline = false;
3679                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3680                                         'noninitial' );
3681                         }
3682
3683                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3684                         # Does this apply to Unicode characters?  Because we aren't
3685                         # handling those here.
3686                         $arrayKey = strtolower( $safeHeadline );
3687                         if ( $legacyHeadline === false ) {
3688                                 $legacyArrayKey = false;
3689                         } else {
3690                                 $legacyArrayKey = strtolower( $legacyHeadline );
3691                         }
3692
3693                         # count how many in assoc. array so we can track dupes in anchors
3694                         if ( isset( $refers[$arrayKey] ) ) {
3695                                 $refers[$arrayKey]++;
3696                         } else {
3697                                 $refers[$arrayKey] = 1;
3698                         }
3699                         if ( isset( $refers[$legacyArrayKey] ) ) {
3700                                 $refers[$legacyArrayKey]++;
3701                         } else {
3702                                 $refers[$legacyArrayKey] = 1;
3703                         }
3704
3705                         # Don't number the heading if it is the only one (looks silly)
3706                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3707                                 # the two are different if the line contains a link
3708                                 $headline = $numbering . ' ' . $headline;
3709                         }
3710
3711                         # Create the anchor for linking from the TOC to the section
3712                         $anchor = $safeHeadline;
3713                         $legacyAnchor = $legacyHeadline;
3714                         if ( $refers[$arrayKey] > 1 ) {
3715                                 $anchor .= '_' . $refers[$arrayKey];
3716                         }
3717                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3718                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3719                         }
3720                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3721                                 $toc .= $sk->tocLine($anchor, $tocline,
3722                                         $numbering, $toclevel, ($isTemplate ? false : $sectionIndex));
3723                         }
3724
3725                         # Add the section to the section tree
3726                         # Find the DOM node for this header
3727                         while ( $node && !$isTemplate ) {
3728                                 if ( $node->getName() === 'h' ) {
3729                                         $bits = $node->splitHeading();
3730                                         if ( $bits['i'] == $sectionIndex )
3731                                                 break;
3732                                 }
3733                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3734                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3735                                 $node = $node->getNextSibling();
3736                         }
3737                         $tocraw[] = array(
3738                                 'toclevel' => $toclevel,
3739                                 'level' => $level,
3740                                 'line' => $tocline,
3741                                 'number' => $numbering,
3742                                 'index' => ($isTemplate ? 'T-' : '' ) . $sectionIndex,
3743                                 'fromtitle' => $titleText,
3744                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3745                                 'anchor' => $anchor,
3746                         );
3747
3748                         # give headline the correct <h#> tag
3749                         if( $showEditLink && $sectionIndex !== false ) {
3750                                 if( $isTemplate ) {
3751                                         # Put a T flag in the section identifier, to indicate to extractSections()
3752                                         # that sections inside <includeonly> should be counted.
3753                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3754                                 } else {
3755                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3756                                 }
3757                         } else {
3758                                 $editlink = '';
3759                         }
3760                         $head[$headlineCount] = $sk->makeHeadline( $level,
3761                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3762                                 $editlink, $legacyAnchor );
3763
3764                         $headlineCount++;
3765                 }
3766
3767                 $this->setOutputType( $oldType );
3768
3769                 # Never ever show TOC if no headers
3770                 if( $numVisible < 1 ) {
3771                         $enoughToc = false;
3772                 }
3773
3774                 if( $enoughToc ) {
3775                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3776                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3777                         }
3778                         $toc = $sk->tocList( $toc );
3779                         $this->mOutput->setTOCHTML( $toc );
3780                 }
3781
3782                 if ( $isMain ) {
3783                         $this->mOutput->setSections( $tocraw );
3784                 }
3785
3786                 # split up and insert constructed headlines
3787
3788                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3789                 $i = 0;
3790
3791                 foreach( $blocks as $block ) {
3792                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3793                                 # This is the [edit] link that appears for the top block of text when
3794                                 # section editing is enabled
3795
3796                                 # Disabled because it broke block formatting
3797                                 # For example, a bullet point in the top line
3798                                 # $full .= $sk->editSectionLink(0);
3799                         }
3800                         $full .= $block;
3801                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3802                                 # Top anchor now in skin
3803                                 $full = $full.$toc;
3804                         }
3805
3806                         if( !empty( $head[$i] ) ) {
3807                                 $full .= $head[$i];
3808                         }
3809                         $i++;
3810                 }
3811                 if( $this->mForceTocPosition ) {
3812                         return str_replace( '<!--MWTOC-->', $toc, $full );
3813                 } else {
3814                         return $full;
3815                 }
3816         }
3817
3818         /**
3819          * Merge $tree2 into $tree1 by replacing the section with index
3820          * $section in $tree1 and its descendants with the sections in $tree2.
3821          * Note that in the returned section tree, only the 'index' and
3822          * 'byteoffset' fields are guaranteed to be correct.
3823          * @param $tree1 array Section tree from ParserOutput::getSectons()
3824         *  @param $tree2 array Section tree
3825          * @param $section int Section index
3826          * @param $title Title Title both section trees come from
3827          * @param $len2 int Length of the original wikitext for $tree2
3828          * @return array Merged section tree
3829          */
3830         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3831                 global $wgContLang;
3832                 $newTree = array();
3833                 $targetLevel = false;
3834                 $merged = false;
3835                 $lastLevel = 1;
3836                 $nextIndex = 1;
3837                 $numbering = array( 0 );
3838                 $titletext = $title->getPrefixedDBkey();
3839                 foreach ( $tree1 as $s ) {
3840                         if ( $targetLevel !== false ) {
3841                                 if ( $s['level'] <= $targetLevel )
3842                                         // We've skipped enough
3843                                         $targetLevel = false;
3844                                 else
3845                                         continue;
3846                         }
3847                         if ( $s['index'] != $section ||
3848                                         $s['fromtitle'] != $titletext ) {
3849                                 self::incrementNumbering( $numbering,
3850                                         $s['toclevel'], $lastLevel );
3851
3852                                 // Rewrite index, byteoffset and number
3853                                 if ( $s['fromtitle'] == $titletext ) {
3854                                         $s['index'] = $nextIndex++;
3855                                         if ( $merged )
3856                                                 $s['byteoffset'] += $len2;
3857                                 }
3858                                 $s['number']  = implode( '.', array_map(
3859                                         array( $wgContLang, 'formatnum' ),
3860                                         $numbering ) );
3861                                 $lastLevel = $s['toclevel'];
3862                                 $newTree[] = $s;
3863                         } else {
3864                                 // We're at $section
3865                                 // Insert sections from $tree2 here
3866                                 foreach ( $tree2 as $s2 ) {
3867                                         // Rewrite the fields in $s2
3868                                         // before inserting it
3869                                         $s2['toclevel'] += $s['toclevel'] - 1;
3870                                         $s2['level'] += $s['level'] - 1;
3871                                         $s2['index'] = $nextIndex++;
3872                                         $s2['byteoffset'] += $s['byteoffset'];
3873
3874                                         self::incrementNumbering( $numbering,
3875                                                 $s2['toclevel'], $lastLevel );
3876                                         $s2['number']  = implode( '.', array_map(
3877                                                 array( $wgContLang, 'formatnum' ),
3878                                                 $numbering ) );
3879                                         $lastLevel = $s2['toclevel'];
3880                                         $newTree[] = $s2;
3881                                 }
3882                                 // Skip all descendants of $section in $tree1
3883                                 $targetLevel = $s['level'];
3884                                 $merged = true;
3885                         }
3886                 }
3887                 return $newTree;
3888         }
3889
3890         /**
3891          * Increment a section number. Helper function for mergeSectionTrees()
3892          * @param $number array Array representing a section number
3893          * @param $level int Current TOC level (depth)
3894          * @param $lastLevel int Level of previous TOC entry
3895          */
3896         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3897                 if ( $level > $lastLevel )
3898                         $number[$level - 1] = 1;
3899                 else if ( $level < $lastLevel ) {
3900                         foreach ( $number as $key => $unused )
3901                                 if ( $key >= $level )
3902                                         unset( $number[$key] );
3903                         $number[$level - 1]++;
3904                 } else
3905                         $number[$level - 1]++;
3906         }
3907
3908         /**
3909          * Transform wiki markup when saving a page by doing \r\n -> \n
3910          * conversion, substitting signatures, {{subst:}} templates, etc.
3911          *
3912          * @param string $text the text to transform
3913          * @param Title &$title the Title object for the current article
3914          * @param User $user the User object describing the current user
3915          * @param ParserOptions $options parsing options
3916          * @param bool $clearState whether to clear the parser state first
3917          * @return string the altered wiki markup
3918          * @public
3919          */
3920         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
3921                 $this->mOptions = $options;
3922                 $this->setTitle( $title );
3923                 $this->setOutputType( self::OT_WIKI );
3924
3925                 if ( $clearState ) {
3926                         $this->clearState();
3927                 }
3928
3929                 $pairs = array(
3930                         "\r\n" => "\n",
3931                 );
3932                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3933                 $text = $this->pstPass2( $text, $user );
3934                 $text = $this->mStripState->unstripBoth( $text );
3935                 return $text;
3936         }
3937
3938         /**
3939          * Pre-save transform helper function
3940          * @private
3941          */
3942         function pstPass2( $text, $user ) {
3943                 global $wgContLang, $wgLocaltimezone;
3944
3945                 /* Note: This is the timestamp saved as hardcoded wikitext to
3946                  * the database, we use $wgContLang here in order to give
3947                  * everyone the same signature and use the default one rather
3948                  * than the one selected in each user's preferences.
3949                  *
3950                  * (see also bug 12815)
3951                  */
3952                 $ts = $this->mOptions->getTimestamp();
3953                 if ( isset( $wgLocaltimezone ) ) {
3954                         $tz = $wgLocaltimezone;
3955                 } else {
3956                         $tz = date_default_timezone_get();
3957                 }
3958
3959                 $unixts = wfTimestamp( TS_UNIX, $ts );
3960                 $oldtz = date_default_timezone_get();
3961                 date_default_timezone_set( $tz );
3962                 $ts = date( 'YmdHis', $unixts );
3963                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
3964
3965                 /* Allow translation of timezones trough wiki. date() can return
3966                  * whatever crap the system uses, localised or not, so we cannot
3967                  * ship premade translations.
3968                  */
3969                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
3970                 $value = wfMsgForContent( $key );
3971                 if ( !wfEmptyMsg( $key, $value ) ) $tzMsg = $value;
3972
3973                 date_default_timezone_set( $oldtz );
3974
3975                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
3976
3977                 # Variable replacement
3978                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3979                 $text = $this->replaceVariables( $text );
3980
3981                 # Signatures
3982                 $sigText = $this->getUserSig( $user );
3983                 $text = strtr( $text, array(
3984                         '~~~~~' => $d,
3985                         '~~~~' => "$sigText $d",
3986                         '~~~' => $sigText
3987                 ) );
3988
3989                 # Context links: [[|name]] and [[name (context)|]]
3990                 #
3991                 global $wgLegalTitleChars;
3992                 $tc = "[$wgLegalTitleChars]";
3993                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3994
3995                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3996                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
3997                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3998                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3999
4000                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4001                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4002                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4003                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4004
4005                 $t = $this->mTitle->getText();
4006                 $m = array();
4007                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4008                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4009                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4010                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4011                 } else {
4012                         # if there's no context, don't bother duplicating the title
4013                         $text = preg_replace( $p2, '[[\\1]]', $text );
4014                 }
4015
4016                 # Trim trailing whitespace
4017                 $text = rtrim( $text );
4018
4019                 return $text;
4020         }
4021
4022         /**
4023          * Fetch the user's signature text, if any, and normalize to
4024          * validated, ready-to-insert wikitext.
4025          * If you have pre-fetched the nickname or the fancySig option, you can
4026          * specify them here to save a database query.
4027          *
4028          * @param User $user
4029          * @return string
4030          */
4031         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4032                 global $wgMaxSigChars;
4033
4034                 $username = $user->getName();
4035
4036                 // If not given, retrieve from the user object.
4037                 if ( $nickname === false )
4038                         $nickname = $user->getOption( 'nickname' );
4039
4040                 if ( is_null( $fancySig ) )
4041                         $fancySig = $user->getBoolOption( 'fancysig' );
4042
4043                 $nickname = $nickname == null ? $username : $nickname;
4044
4045                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4046                         $nickname = $username;
4047                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4048                 } elseif( $fancySig !== false ) {
4049                         # Sig. might contain markup; validate this
4050                         if( $this->validateSig( $nickname ) !== false ) {
4051                                 # Validated; clean up (if needed) and return it
4052                                 return $this->cleanSig( $nickname, true );
4053                         } else {
4054                                 # Failed to validate; fall back to the default
4055                                 $nickname = $username;
4056                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4057                         }
4058                 }
4059
4060                 // Make sure nickname doesnt get a sig in a sig
4061                 $nickname = $this->cleanSigInSig( $nickname );
4062
4063                 # If we're still here, make it a link to the user page
4064                 $userText = wfEscapeWikiText( $username );
4065                 $nickText = wfEscapeWikiText( $nickname );
4066                 if ( $user->isAnon() )  {
4067                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4068                 } else {
4069                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4070                 }
4071         }
4072
4073         /**
4074          * Check that the user's signature contains no bad XML
4075          *
4076          * @param string $text
4077          * @return mixed An expanded string, or false if invalid.
4078          */
4079         function validateSig( $text ) {
4080                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4081         }
4082
4083         /**
4084          * Clean up signature text
4085          *
4086          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4087          * 2) Substitute all transclusions
4088          *
4089          * @param string $text
4090          * @param $parsing Whether we're cleaning (preferences save) or parsing
4091          * @return string Signature text
4092          */
4093         function cleanSig( $text, $parsing = false ) {
4094                 if ( !$parsing ) {
4095                         global $wgTitle;
4096                         $this->clearState();
4097                         $this->setTitle( $wgTitle );
4098                         $this->mOptions = new ParserOptions;
4099                         $this->setOutputType = self::OT_PREPROCESS;
4100                 }
4101
4102                 # Option to disable this feature
4103                 if ( !$this->mOptions->getCleanSignatures() ) {
4104                         return $text;
4105                 }
4106
4107                 # FIXME: regex doesn't respect extension tags or nowiki
4108                 #  => Move this logic to braceSubstitution()
4109                 $substWord = MagicWord::get( 'subst' );
4110                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4111                 $substText = '{{' . $substWord->getSynonym( 0 );
4112
4113                 $text = preg_replace( $substRegex, $substText, $text );
4114                 $text = $this->cleanSigInSig( $text );
4115                 $dom = $this->preprocessToDom( $text );
4116                 $frame = $this->getPreprocessor()->newFrame();
4117                 $text = $frame->expand( $dom );
4118
4119                 if ( !$parsing ) {
4120                         $text = $this->mStripState->unstripBoth( $text );
4121                 }
4122
4123                 return $text;
4124         }
4125
4126         /**
4127          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4128          * @param string $text
4129          * @return string Signature text with /~{3,5}/ removed
4130          */
4131         function cleanSigInSig( $text ) {
4132                 $text = preg_replace( '/~{3,5}/', '', $text );
4133                 return $text;
4134         }
4135
4136         /**
4137          * Set up some variables which are usually set up in parse()
4138          * so that an external function can call some class members with confidence
4139          * @public
4140          */
4141         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4142                 $this->setTitle( $title );
4143                 $this->mOptions = $options;
4144                 $this->setOutputType( $outputType );
4145                 if ( $clearState ) {
4146                         $this->clearState();
4147                 }
4148         }
4149
4150         /**
4151          * Wrapper for preprocess()
4152          *
4153          * @param string $text the text to preprocess
4154          * @param ParserOptions $options  options
4155          * @return string
4156          * @public
4157          */
4158         function transformMsg( $text, $options ) {
4159                 global $wgTitle;
4160                 static $executing = false;
4161
4162                 # Guard against infinite recursion
4163                 if ( $executing ) {
4164                         return $text;
4165                 }
4166                 $executing = true;
4167
4168                 wfProfileIn(__METHOD__);
4169                 $text = $this->preprocess( $text, $wgTitle, $options );
4170
4171                 $executing = false;
4172                 wfProfileOut(__METHOD__);
4173                 return $text;
4174         }
4175
4176         /**
4177          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4178          * The callback should have the following form:
4179          *    function myParserHook( $text, $params, &$parser ) { ... }
4180          *
4181          * Transform and return $text. Use $parser for any required context, e.g. use
4182          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4183          *
4184          * @public
4185          *
4186          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4187          * @param mixed $callback The callback function (and object) to use for the tag
4188          *
4189          * @return The old value of the mTagHooks array associated with the hook
4190          */
4191         function setHook( $tag, $callback ) {
4192                 $tag = strtolower( $tag );
4193                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4194                 $this->mTagHooks[$tag] = $callback;
4195                 if( !in_array( $tag, $this->mStripList ) ) {
4196                         $this->mStripList[] = $tag;
4197                 }
4198
4199                 return $oldVal;
4200         }
4201
4202         function setTransparentTagHook( $tag, $callback ) {
4203                 $tag = strtolower( $tag );
4204                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4205                 $this->mTransparentTagHooks[$tag] = $callback;
4206
4207                 return $oldVal;
4208         }
4209
4210         /**
4211          * Remove all tag hooks
4212          */
4213         function clearTagHooks() {
4214                 $this->mTagHooks = array();
4215                 $this->mStripList = $this->mDefaultStripList;
4216         }
4217
4218         /**
4219          * Create a function, e.g. {{sum:1|2|3}}
4220          * The callback function should have the form:
4221          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4222          *
4223          * Or with SFH_OBJECT_ARGS:
4224          *    function myParserFunction( $parser, $frame, $args ) { ... }
4225          *
4226          * The callback may either return the text result of the function, or an array with the text
4227          * in element 0, and a number of flags in the other elements. The names of the flags are
4228          * specified in the keys. Valid flags are:
4229          *   found                     The text returned is valid, stop processing the template. This
4230          *                             is on by default.
4231          *   nowiki                    Wiki markup in the return value should be escaped
4232          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4233          *
4234          * @public
4235          *
4236          * @param string $id The magic word ID
4237          * @param mixed $callback The callback function (and object) to use
4238          * @param integer $flags a combination of the following flags:
4239          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4240          *
4241          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4242          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4243          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4244          *     the arguments, and to control the way they are expanded.
4245          *
4246          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4247          *     arguments, for instance:
4248          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4249          *
4250          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4251          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4252          *     working if/when this is changed.
4253          *
4254          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4255          *     expansion.
4256          *
4257          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4258          *     about the methods available in PPFrame and PPNode.
4259          *
4260          * @return The old callback function for this name, if any
4261          */
4262         function setFunctionHook( $id, $callback, $flags = 0 ) {
4263                 global $wgContLang;
4264
4265                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4266                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4267
4268                 # Add to function cache
4269                 $mw = MagicWord::get( $id );
4270                 if( !$mw )
4271                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4272
4273                 $synonyms = $mw->getSynonyms();
4274                 $sensitive = intval( $mw->isCaseSensitive() );
4275
4276                 foreach ( $synonyms as $syn ) {
4277                         # Case
4278                         if ( !$sensitive ) {
4279                                 $syn = $wgContLang->lc( $syn );
4280                         }
4281                         # Add leading hash
4282                         if ( !( $flags & SFH_NO_HASH ) ) {
4283                                 $syn = '#' . $syn;
4284                         }
4285                         # Remove trailing colon
4286                         if ( substr( $syn, -1, 1 ) === ':' ) {
4287                                 $syn = substr( $syn, 0, -1 );
4288                         }
4289                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4290                 }
4291                 return $oldVal;
4292         }
4293
4294         /**
4295          * Get all registered function hook identifiers
4296          *
4297          * @return array
4298          */
4299         function getFunctionHooks() {
4300                 return array_keys( $this->mFunctionHooks );
4301         }
4302
4303         /**
4304          * Create a tag function, e.g. <test>some stuff</test>.
4305          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4306          * Unlike parser functions, their content is not preprocessed.
4307          */
4308         function setFunctionTagHook( $tag, $callback, $flags ) {
4309                 $tag = strtolower( $tag );
4310                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4311                         $this->mFunctionTagHooks[$tag] : null;
4312                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4313
4314                 if( !in_array( $tag, $this->mStripList ) ) {
4315                         $this->mStripList[] = $tag;
4316                 }
4317
4318                 return $old;
4319         }
4320
4321         /**
4322          * FIXME: update documentation. makeLinkObj() is deprecated.
4323          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4324          * Placeholders created in Skin::makeLinkObj()
4325          * Returns an array of link CSS classes, indexed by PDBK.
4326          */
4327         function replaceLinkHolders( &$text, $options = 0 ) {
4328                 return $this->mLinkHolders->replace( $text );
4329         }
4330
4331         /**
4332          * Replace <!--LINK--> link placeholders with plain text of links
4333          * (not HTML-formatted).
4334          * @param string $text
4335          * @return string
4336          */
4337         function replaceLinkHoldersText( $text ) {
4338                 return $this->mLinkHolders->replaceText( $text );
4339         }
4340
4341         /**
4342          * Renders an image gallery from a text with one line per image.
4343          * text labels may be given by using |-style alternative text. E.g.
4344          *   Image:one.jpg|The number "1"
4345          *   Image:tree.jpg|A tree
4346          * given as text will return the HTML of a gallery with two images,
4347          * labeled 'The number "1"' and
4348          * 'A tree'.
4349          */
4350         function renderImageGallery( $text, $params ) {
4351                 $ig = new ImageGallery();
4352                 $ig->setContextTitle( $this->mTitle );
4353                 $ig->setShowBytes( false );
4354                 $ig->setShowFilename( false );
4355                 $ig->setParser( $this );
4356                 $ig->setHideBadImages();
4357                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4358                 $ig->useSkin( $this->mOptions->getSkin() );
4359                 $ig->mRevisionId = $this->mRevisionId;
4360
4361                 if( isset( $params['caption'] ) ) {
4362                         $caption = $params['caption'];
4363                         $caption = htmlspecialchars( $caption );
4364                         $caption = $this->replaceInternalLinks( $caption );
4365                         $ig->setCaptionHtml( $caption );
4366                 }
4367                 if( isset( $params['perrow'] ) ) {
4368                         $ig->setPerRow( $params['perrow'] );
4369                 }
4370                 if( isset( $params['widths'] ) ) {
4371                         $ig->setWidths( $params['widths'] );
4372                 }
4373                 if( isset( $params['heights'] ) ) {
4374                         $ig->setHeights( $params['heights'] );
4375                 }
4376
4377                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4378
4379                 $lines = StringUtils::explode( "\n", $text );
4380                 foreach ( $lines as $line ) {
4381                         # match lines like these:
4382                         # Image:someimage.jpg|This is some image
4383                         $matches = array();
4384                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4385                         # Skip empty lines
4386                         if ( count( $matches ) == 0 ) {
4387                                 continue;
4388                         }
4389
4390                         if ( strpos( $matches[0], '%' ) !== false )
4391                                 $matches[1] = urldecode( $matches[1] );
4392                         $tp = Title::newFromText( $matches[1]/*, NS_FILE*/ );
4393                         $nt =& $tp;
4394                         if( is_null( $nt ) ) {
4395                                 # Bogus title. Ignore these so we don't bomb out later.
4396                                 continue;
4397                         }
4398                         if ( isset( $matches[3] ) ) {
4399                                 $label = $matches[3];
4400                         } else {
4401                                 $label = '';
4402                         }
4403
4404                         $html = $this->recursiveTagParse( trim( $label ) );
4405
4406                         $ig->add( $nt, $html );
4407
4408                         # Only add real images (bug #5586)
4409                         if ( $nt->getNamespace() == NS_FILE ) {
4410                                 $this->mOutput->addImage( $nt->getDBkey() );
4411                         }
4412                 }
4413                 return $ig->toHTML();
4414         }
4415
4416         function getImageParams( $handler ) {
4417                 if ( $handler ) {
4418                         $handlerClass = get_class( $handler );
4419                 } else {
4420                         $handlerClass = '';
4421                 }
4422                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4423                         // Initialise static lists
4424                         static $internalParamNames = array(
4425                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4426                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4427                                         'bottom', 'text-bottom' ),
4428                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4429                                         'upright', 'border', 'link', 'alt' ),
4430                         );
4431                         static $internalParamMap;
4432                         if ( !$internalParamMap ) {
4433                                 $internalParamMap = array();
4434                                 foreach ( $internalParamNames as $type => $names ) {
4435                                         foreach ( $names as $name ) {
4436                                                 $magicName = str_replace( '-', '_', "img_$name" );
4437                                                 $internalParamMap[$magicName] = array( $type, $name );
4438                                         }
4439                                 }
4440                         }
4441
4442                         // Add handler params
4443                         $paramMap = $internalParamMap;
4444                         if ( $handler ) {
4445                                 $handlerParamMap = $handler->getParamMap();
4446                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4447                                         $paramMap[$magic] = array( 'handler', $paramName );
4448                                 }
4449                         }
4450                         $this->mImageParams[$handlerClass] = $paramMap;
4451                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4452                 }
4453                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4454         }
4455
4456         /**
4457          * Parse image options text and use it to make an image
4458          * @param Title $title
4459          * @param string $options
4460          * @param LinkHolderArray $holders
4461          */
4462         function makeImage( $title, $options, $holders = false ) {
4463                 # Check if the options text is of the form "options|alt text"
4464                 # Options are:
4465                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4466                 #  * left       no resizing, just left align. label is used for alt= only
4467                 #  * right      same, but right aligned
4468                 #  * none       same, but not aligned
4469                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4470                 #  * center     center the image
4471                 #  * frame      Keep original image size, no magnify-button.
4472                 #  * framed     Same as "frame"
4473                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4474                 #  * upright    reduce width for upright images, rounded to full __0 px
4475                 #  * border     draw a 1px border around the image
4476                 #  * alt        Text for HTML alt attribute (defaults to empty)
4477                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4478                 # vertical-align values (no % or length right now):
4479                 #  * baseline
4480                 #  * sub
4481                 #  * super
4482                 #  * top
4483                 #  * text-top
4484                 #  * middle
4485                 #  * bottom
4486                 #  * text-bottom
4487
4488                 $parts = StringUtils::explode( "|", $options );
4489                 $sk = $this->mOptions->getSkin();
4490
4491                 # Give extensions a chance to select the file revision for us
4492                 $skip = $time = $descQuery = false;
4493                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4494
4495                 if ( $skip ) {
4496                         return $sk->link( $title );
4497                 }
4498
4499                 # Get the file
4500                 $imagename = $title->getDBkey();
4501                 $file = wfFindFile( $title, array( 'time' => $time ) );
4502                 # Get parameter map
4503                 $handler = $file ? $file->getHandler() : false;
4504
4505                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4506
4507                 # Process the input parameters
4508                 $caption = '';
4509                 $params = array( 'frame' => array(), 'handler' => array(),
4510                         'horizAlign' => array(), 'vertAlign' => array() );
4511                 foreach( $parts as $part ) {
4512                         $part = trim( $part );
4513                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4514                         $validated = false;
4515                         if( isset( $paramMap[$magicName] ) ) {
4516                                 list( $type, $paramName ) = $paramMap[$magicName];
4517
4518                                 // Special case; width and height come in one variable together
4519                                 if( $type === 'handler' && $paramName === 'width' ) {
4520                                         $m = array();
4521                                         # (bug 13500) In both cases (width/height and width only),
4522                                         # permit trailing "px" for backward compatibility.
4523                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4524                                                 $width = intval( $m[1] );
4525                                                 $height = intval( $m[2] );
4526                                                 if ( $handler->validateParam( 'width', $width ) ) {
4527                                                         $params[$type]['width'] = $width;
4528                                                         $validated = true;
4529                                                 }
4530                                                 if ( $handler->validateParam( 'height', $height ) ) {
4531                                                         $params[$type]['height'] = $height;
4532                                                         $validated = true;
4533                                                 }
4534                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4535                                                 $width = intval( $value );
4536                                                 if ( $handler->validateParam( 'width', $width ) ) {
4537                                                         $params[$type]['width'] = $width;
4538                                                         $validated = true;
4539                                                 }
4540                                         } // else no validation -- bug 13436
4541                                 } else {
4542                                         if ( $type === 'handler' ) {
4543                                                 # Validate handler parameter
4544                                                 $validated = $handler->validateParam( $paramName, $value );
4545                                         } else {
4546                                                 # Validate internal parameters
4547                                                 switch( $paramName ) {
4548                                                 case 'manualthumb':
4549                                                 case 'alt':
4550                                                         // @todo Fixme: possibly check validity here for
4551                                                         // manualthumb? downstream behavior seems odd with
4552                                                         // missing manual thumbs.
4553                                                         $validated = true;
4554                                                         $value = $this->stripAltText( $value, $holders );
4555                                                         break;
4556                                                 case 'link':
4557                                                         $chars = self::EXT_LINK_URL_CLASS;
4558                                                         $prots = $this->mUrlProtocols;
4559                                                         if ( $value === '' ) {
4560                                                                 $paramName = 'no-link';
4561                                                                 $value = true;
4562                                                                 $validated = true;
4563                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4564                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4565                                                                         $paramName = 'link-url';
4566                                                                         $this->mOutput->addExternalLink( $value );
4567                                                                         $validated = true;
4568                                                                 }
4569                                                         } else {
4570                                                                 $linkTitle = Title::newFromText( $value );
4571                                                                 if ( $linkTitle ) {
4572                                                                         $paramName = 'link-title';
4573                                                                         $value = $linkTitle;
4574                                                                         $this->mOutput->addLink( $linkTitle );
4575                                                                         $validated = true;
4576                                                                 }
4577                                                         }
4578                                                         break;
4579                                                 default:
4580                                                         // Most other things appear to be empty or numeric...
4581                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4582                                                 }
4583                                         }
4584
4585                                         if ( $validated ) {
4586                                                 $params[$type][$paramName] = $value;
4587                                         }
4588                                 }
4589                         }
4590                         if ( !$validated ) {
4591                                 $caption = $part;
4592                         }
4593                 }
4594
4595                 # Process alignment parameters
4596                 if ( $params['horizAlign'] ) {
4597                         $params['frame']['align'] = key( $params['horizAlign'] );
4598                 }
4599                 if ( $params['vertAlign'] ) {
4600                         $params['frame']['valign'] = key( $params['vertAlign'] );
4601                 }
4602
4603                 $params['frame']['caption'] = $caption;
4604
4605                 # Will the image be presented in a frame, with the caption below?
4606                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4607                                  isset( $params['frame']['framed'] ) ||
4608                                  isset( $params['frame']['thumbnail'] ) ||
4609                                  isset( $params['frame']['manualthumb'] );
4610
4611                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4612                 # came to also set the caption, ordinary text after the image -- which
4613                 # makes no sense, because that just repeats the text multiple times in
4614                 # screen readers.  It *also* came to set the title attribute.
4615                 #
4616                 # Now that we have an alt attribute, we should not set the alt text to
4617                 # equal the caption: that's worse than useless, it just repeats the
4618                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4619                 # use the unnamed parameter for alt text as well, just for the time be-
4620                 # ing, if the unnamed param is set and the alt param is not.
4621                 #
4622                 # For the future, we need to figure out if we want to tweak this more,
4623                 # e.g., introducing a title= parameter for the title; ignoring the un-
4624                 # named parameter entirely for images without a caption; adding an ex-
4625                 # plicit caption= parameter and preserving the old magic unnamed para-
4626                 # meter for BC; ...
4627                 if ( $imageIsFramed ) { # Framed image
4628                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4629                                 # No caption or alt text, add the filename as the alt text so
4630                                 # that screen readers at least get some description of the image
4631                                 $params['frame']['alt'] = $title->getText();
4632                         }
4633                         # Do not set $params['frame']['title'] because tooltips don't make sense
4634                         # for framed images
4635                 } else { # Inline image
4636                         if ( !isset( $params['frame']['alt'] ) ) {
4637                                 # No alt text, use the "caption" for the alt text
4638                                 if ( $caption !== '') {
4639                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4640                                 } else {
4641                                         # No caption, fall back to using the filename for the
4642                                         # alt text
4643                                         $params['frame']['alt'] = $title->getText();
4644                                 }
4645                         }
4646                         # Use the "caption" for the tooltip text
4647                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4648                 }
4649
4650                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4651
4652                 # Linker does the rest
4653                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4654
4655                 # Give the handler a chance to modify the parser object
4656                 if ( $handler ) {
4657                         $handler->parserTransformHook( $this, $file );
4658                 }
4659
4660                 return $ret;
4661         }
4662
4663         protected function stripAltText( $caption, $holders ) {
4664                 # Strip bad stuff out of the title (tooltip).  We can't just use
4665                 # replaceLinkHoldersText() here, because if this function is called
4666                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4667                 if ( $holders ) {
4668                         $tooltip = $holders->replaceText( $caption );
4669                 } else {
4670                         $tooltip = $this->replaceLinkHoldersText( $caption );
4671                 }
4672
4673                 # make sure there are no placeholders in thumbnail attributes
4674                 # that are later expanded to html- so expand them now and
4675                 # remove the tags
4676                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4677                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4678
4679                 return $tooltip;
4680         }
4681
4682         /**
4683          * Set a flag in the output object indicating that the content is dynamic and
4684          * shouldn't be cached.
4685          */
4686         function disableCache() {
4687                 wfDebug( "Parser output marked as uncacheable.\n" );
4688                 $this->mOutput->mCacheTime = -1;
4689         }
4690
4691         /**#@+
4692          * Callback from the Sanitizer for expanding items found in HTML attribute
4693          * values, so they can be safely tested and escaped.
4694          * @param string $text
4695          * @param PPFrame $frame
4696          * @return string
4697          * @private
4698          */
4699         function attributeStripCallback( &$text, $frame = false ) {
4700                 $text = $this->replaceVariables( $text, $frame );
4701                 $text = $this->mStripState->unstripBoth( $text );
4702                 return $text;
4703         }
4704
4705         /**#@-*/
4706
4707         /**#@+
4708          * Accessor/mutator
4709          */
4710         function Title( $x = null ) { return wfSetVar( $this->mTitle, $x ); }
4711         function Options( $x = null ) { return wfSetVar( $this->mOptions, $x ); }
4712         function OutputType( $x = null ) { return wfSetVar( $this->mOutputType, $x ); }
4713         /**#@-*/
4714
4715         /**#@+
4716          * Accessor
4717          */
4718         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4719         /**#@-*/
4720
4721
4722         /**
4723          * Break wikitext input into sections, and either pull or replace
4724          * some particular section's text.
4725          *
4726          * External callers should use the getSection and replaceSection methods.
4727          *
4728          * @param string $text Page wikitext
4729          * @param string $section A section identifier string of the form:
4730          *   <flag1> - <flag2> - ... - <section number>
4731          *
4732          * Currently the only recognised flag is "T", which means the target section number
4733          * was derived during a template inclusion parse, in other words this is a template
4734          * section edit link. If no flags are given, it was an ordinary section edit link.
4735          * This flag is required to avoid a section numbering mismatch when a section is
4736          * enclosed by <includeonly> (bug 6563).
4737          *
4738          * The section number 0 pulls the text before the first heading; other numbers will
4739          * pull the given section along with its lower-level subsections. If the section is
4740          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4741          *
4742          * @param string $mode One of "get" or "replace"
4743          * @param string $newText Replacement text for section data.
4744          * @return string for "get", the extracted section text.
4745          *                for "replace", the whole page with the section replaced.
4746          */
4747         private function extractSections( $text, $section, $mode, $newText='' ) {
4748                 global $wgTitle;
4749                 $this->clearState();
4750                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4751                 $this->mOptions = new ParserOptions;
4752                 $this->setOutputType( self::OT_WIKI );
4753                 $outText = '';
4754                 $frame = $this->getPreprocessor()->newFrame();
4755
4756                 // Process section extraction flags
4757                 $flags = 0;
4758                 $sectionParts = explode( '-', $section );
4759                 $sectionIndex = array_pop( $sectionParts );
4760                 foreach ( $sectionParts as $part ) {
4761                         if ( $part === 'T' ) {
4762                                 $flags |= self::PTD_FOR_INCLUSION;
4763                         }
4764                 }
4765                 // Preprocess the text
4766                 $root = $this->preprocessToDom( $text, $flags );
4767
4768                 // <h> nodes indicate section breaks
4769                 // They can only occur at the top level, so we can find them by iterating the root's children
4770                 $node = $root->getFirstChild();
4771
4772                 // Find the target section
4773                 if ( $sectionIndex == 0 ) {
4774                         // Section zero doesn't nest, level=big
4775                         $targetLevel = 1000;
4776                 } else {
4777             while ( $node ) {
4778                 if ( $node->getName() === 'h' ) {
4779                     $bits = $node->splitHeading();
4780                                         if ( $bits['i'] == $sectionIndex ) {
4781                                         $targetLevel = $bits['level'];
4782                                                 break;
4783                                         }
4784                                 }
4785                                 if ( $mode === 'replace' ) {
4786                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4787                                 }
4788                                 $node = $node->getNextSibling();
4789                         }
4790                 }
4791
4792                 if ( !$node ) {
4793                         // Not found
4794                         if ( $mode === 'get' ) {
4795                                 return $newText;
4796                         } else {
4797                                 return $text;
4798                         }
4799                 }
4800
4801                 // Find the end of the section, including nested sections
4802                 do {
4803                         if ( $node->getName() === 'h' ) {
4804                                 $bits = $node->splitHeading();
4805                                 $curLevel = $bits['level'];
4806                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4807                                         break;
4808                                 }
4809                         }
4810                         if ( $mode === 'get' ) {
4811                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4812                         }
4813                         $node = $node->getNextSibling();
4814                 } while ( $node );
4815
4816                 // Write out the remainder (in replace mode only)
4817                 if ( $mode === 'replace' ) {
4818                         // Output the replacement text
4819                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4820                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4821                         // Only add trailing whitespace if there is newText
4822                         if($newText != "") {
4823                                 $outText .= $newText . "\n\n";
4824                         }
4825
4826                         while ( $node ) {
4827                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4828                                 $node = $node->getNextSibling();
4829                         }
4830                 }
4831
4832                 if ( is_string( $outText ) ) {
4833                         // Re-insert stripped tags
4834                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4835                 }
4836
4837                 return $outText;
4838         }
4839
4840         /**
4841          * This function returns the text of a section, specified by a number ($section).
4842          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4843          * the first section before any such heading (section 0).
4844          *
4845          * If a section contains subsections, these are also returned.
4846          *
4847          * @param string $text text to look in
4848          * @param string $section section identifier
4849          * @param string $deftext default to return if section is not found
4850          * @return string text of the requested section
4851          */
4852         public function getSection( $text, $section, $deftext='' ) {
4853                 return $this->extractSections( $text, $section, "get", $deftext );
4854         }
4855
4856         public function replaceSection( $oldtext, $section, $text ) {
4857                 return $this->extractSections( $oldtext, $section, "replace", $text );
4858         }
4859
4860         /**
4861          * Get the timestamp associated with the current revision, adjusted for
4862          * the default server-local timestamp
4863          */
4864         function getRevisionTimestamp() {
4865                 if ( is_null( $this->mRevisionTimestamp ) ) {
4866                         wfProfileIn( __METHOD__ );
4867                         global $wgContLang;
4868                         $dbr = wfGetDB( DB_SLAVE );
4869                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4870                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4871
4872                         // Normalize timestamp to internal MW format for timezone processing.
4873                         // This has the added side-effect of replacing a null value with
4874                         // the current time, which gives us more sensible behavior for
4875                         // previews.
4876                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4877
4878                         // The cryptic '' timezone parameter tells to use the site-default
4879                         // timezone offset instead of the user settings.
4880                         //
4881                         // Since this value will be saved into the parser cache, served
4882                         // to other users, and potentially even used inside links and such,
4883                         // it needs to be consistent for all visitors.
4884                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4885
4886                         wfProfileOut( __METHOD__ );
4887                 }
4888                 return $this->mRevisionTimestamp;
4889         }
4890
4891         /**
4892          * Get the name of the user that edited the last revision
4893          */
4894         function getRevisionUser() {
4895                 // if this template is subst: the revision id will be blank,
4896                 // so just use the current user's name
4897                 if( $this->mRevisionId ) {
4898                         $revision = Revision::newFromId( $this->mRevisionId );
4899                         $revuser = $revision->getUserText();
4900                 } else {
4901                         global $wgUser;
4902                         $revuser = $wgUser->getName();
4903                 }
4904                 return $revuser;
4905         }
4906
4907         /**
4908          * Mutator for $mDefaultSort
4909          *
4910          * @param $sort New value
4911          */
4912         public function setDefaultSort( $sort ) {
4913                 $this->mDefaultSort = $sort;
4914         }
4915
4916         /**
4917          * Accessor for $mDefaultSort
4918          * Will use the title/prefixed title if none is set
4919          *
4920          * @return string
4921          */
4922         public function getDefaultSort() {
4923                 global $wgCategoryPrefixedDefaultSortkey;
4924                 if( $this->mDefaultSort !== false ) {
4925                         return $this->mDefaultSort;
4926                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4927                         !$wgCategoryPrefixedDefaultSortkey) {
4928                         return $this->mTitle->getText();
4929                 } else {
4930                         return $this->mTitle->getPrefixedText();
4931                 }
4932         }
4933
4934         /**
4935          * Accessor for $mDefaultSort
4936          * Unlike getDefaultSort(), will return false if none is set
4937          *
4938          * @return string or false
4939          */
4940         public function getCustomDefaultSort() {
4941                 return $this->mDefaultSort;
4942         }
4943
4944         /**
4945          * Try to guess the section anchor name based on a wikitext fragment
4946          * presumably extracted from a heading, for example "Header" from
4947          * "== Header ==".
4948          */
4949         public function guessSectionNameFromWikiText( $text ) {
4950                 # Strip out wikitext links(they break the anchor)
4951                 $text = $this->stripSectionName( $text );
4952                 $headline = Sanitizer::decodeCharReferences( $text );
4953                 # strip out HTML
4954                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4955                 $headline = trim( $headline );
4956                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4957                 $replacearray = array(
4958                         '%3A' => ':',
4959                         '%' => '.'
4960                 );
4961                 return str_replace(
4962                         array_keys( $replacearray ),
4963                         array_values( $replacearray ),
4964                         $sectionanchor );
4965         }
4966
4967         /**
4968          * Strips a text string of wikitext for use in a section anchor
4969          *
4970          * Accepts a text string and then removes all wikitext from the
4971          * string and leaves only the resultant text (i.e. the result of
4972          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4973          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4974          * to create valid section anchors by mimicing the output of the
4975          * parser when headings are parsed.
4976          *
4977          * @param $text string Text string to be stripped of wikitext
4978          * for use in a Section anchor
4979          * @return Filtered text string
4980          */
4981         public function stripSectionName( $text ) {
4982                 # Strip internal link markup
4983                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4984                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4985
4986                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4987                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4988                 # on how many empty links there are on the page - need to figure that out.
4989                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4990
4991                 # Parse wikitext quotes (italics & bold)
4992                 $text = $this->doQuotes($text);
4993
4994                 # Strip HTML tags
4995                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4996                 return $text;
4997         }
4998
4999         function srvus( $text ) {
5000                 return $this->testSrvus( $text, $this->mOutputType );
5001         }
5002
5003         /**
5004          * strip/replaceVariables/unstrip for preprocessor regression testing
5005          */
5006         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5007                 $this->clearState();
5008                 if ( ! ( $title instanceof Title ) ) {
5009                         $title = Title::newFromText( $title );
5010                 }
5011                 $this->mTitle = $title;
5012                 $this->mOptions = $options;
5013                 $this->setOutputType( $outputType );
5014                 $text = $this->replaceVariables( $text );
5015                 $text = $this->mStripState->unstripBoth( $text );
5016                 $text = Sanitizer::removeHTMLtags( $text );
5017                 return $text;
5018         }
5019
5020         function testPst( $text, $title, $options ) {
5021                 global $wgUser;
5022                 if ( ! ( $title instanceof Title ) ) {
5023                         $title = Title::newFromText( $title );
5024                 }
5025                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5026         }
5027
5028         function testPreprocess( $text, $title, $options ) {
5029                 if ( ! ( $title instanceof Title ) ) {
5030                         $title = Title::newFromText( $title );
5031                 }
5032                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5033         }
5034
5035         function markerSkipCallback( $s, $callback ) {
5036                 $i = 0;
5037                 $out = '';
5038                 while ( $i < strlen( $s ) ) {
5039                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5040                         if ( $markerStart === false ) {
5041                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5042                                 break;
5043                         } else {
5044                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5045                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5046                                 if ( $markerEnd === false ) {
5047                                         $out .= substr( $s, $markerStart );
5048                                         break;
5049                                 } else {
5050                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5051                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5052                                         $i = $markerEnd;
5053                                 }
5054                         }
5055                 }
5056                 return $out;
5057         }
5058
5059         function serialiseHalfParsedText( $text ) {
5060                 $data = array();
5061                 $data['text'] = $text;
5062
5063                 // First, find all strip markers, and store their
5064                 //  data in an array.
5065                 $stripState = new StripState;
5066                 $pos = 0;
5067                 while( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) ) && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) ) {
5068                         $end_pos += strlen( self::MARKER_SUFFIX );
5069                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5070
5071                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5072                                 $replaceArray = $stripState->general;
5073                                 $stripText = $this->mStripState->general->data[$marker];
5074                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5075                                 $replaceArray = $stripState->nowiki;
5076                                 $stripText = $this->mStripState->nowiki->data[$marker];
5077                         } else {
5078                                 throw new MWException( "Hanging strip marker: '$marker'." );
5079                         }
5080
5081                         $replaceArray->setPair( $marker, $stripText );
5082                         $pos = $end_pos;
5083                 }
5084                 $data['stripstate'] = $stripState;
5085
5086                 // Now, find all of our links, and store THEIR
5087                 //  data in an array! :)
5088                 $links = array( 'internal' => array(), 'interwiki' => array() );
5089                 $pos = 0;
5090
5091                 // Internal links
5092                 while( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5093                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5094
5095                         $ns = trim($ns);
5096                         if (empty( $links['internal'][$ns] )) {
5097                                 $links['internal'][$ns] = array();
5098                         }
5099
5100                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5101                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5102                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5103                 }
5104
5105                 $pos = 0;
5106
5107                 // Interwiki links
5108                 while( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5109                         $data = substr( $text, $start_pos );
5110                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5111                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5112                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5113                 }
5114
5115                 $data['linkholder'] = $links;
5116
5117                 return $data;
5118         }
5119
5120         function unserialiseHalfParsedText( $data, $intPrefix = null /* Unique identifying prefix */ ) {
5121                 if (!$intPrefix)
5122                         $intPrefix = $this->getRandomString();
5123
5124                 // First, extract the strip state.
5125                 $stripState = $data['stripstate'];
5126                 $this->mStripState->general->merge( $stripState->general );
5127                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5128
5129                 // Now, extract the text, and renumber links
5130                 $text = $data['text'];
5131                 $links = $data['linkholder'];
5132
5133                 // Internal...
5134                 foreach( $links['internal'] as $ns => $nsLinks ) {
5135                         foreach( $nsLinks as $key => $entry ) {
5136                                 $newKey = $intPrefix . '-' . $key;
5137                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5138
5139                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5140                         }
5141                 }
5142
5143                 // Interwiki...
5144                 foreach( $links['interwiki'] as $key => $entry ) {
5145                         $newKey = "$intPrefix-$key";
5146                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5147
5148                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5149                 }
5150
5151                 // Should be good to go.
5152                 return $text;
5153         }
5154 }
5155
5156 /**
5157  * @todo document, briefly.
5158  * @ingroup Parser
5159  */
5160 class StripState {
5161         var $general, $nowiki;
5162
5163         function __construct() {
5164                 $this->general = new ReplacementArray;
5165                 $this->nowiki = new ReplacementArray;
5166         }
5167
5168         function unstripGeneral( $text ) {
5169                 wfProfileIn( __METHOD__ );
5170                 do {
5171                         $oldText = $text;
5172                         $text = $this->general->replace( $text );
5173                 } while ( $text !== $oldText );
5174                 wfProfileOut( __METHOD__ );
5175                 return $text;
5176         }
5177
5178         function unstripNoWiki( $text ) {
5179                 wfProfileIn( __METHOD__ );
5180                 do {
5181                         $oldText = $text;
5182                         $text = $this->nowiki->replace( $text );
5183                 } while ( $text !== $oldText );
5184                 wfProfileOut( __METHOD__ );
5185                 return $text;
5186         }
5187
5188         function unstripBoth( $text ) {
5189                 wfProfileIn( __METHOD__ );
5190                 do {
5191                         $oldText = $text;
5192                         $text = $this->general->replace( $text );
5193                         $text = $this->nowiki->replace( $text );
5194                 } while ( $text !== $oldText );
5195                 wfProfileOut( __METHOD__ );
5196                 return $text;
5197         }
5198 }
5199
5200 /**
5201  * @todo document, briefly.
5202  * @ingroup Parser
5203  */
5204 class OnlyIncludeReplacer {
5205         var $output = '';
5206
5207         function replace( $matches ) {
5208                 if ( substr( $matches[1], -1 ) === "\n" ) {
5209                         $this->output .= substr( $matches[1], 0, -1 );
5210                 } else {
5211                         $this->output .= $matches[1];
5212                 }
5213         }
5214 }