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
 504          */
 505         function getTransclusionText( $title ) {
 506                 list($text, $title) = $this->getTemplateDom( $title );
 507                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 508                 return $this->getPreprocessor()->newFrame()->expand( $text, $flags );
 509         }
 510
 511         /**
 512          * Get a random string
 513          *
 514          * @private
 515          * @static
 516          */
 517         function getRandomString() {
 518                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 519         }
 520
 521         function &getTitle() { return $this->mTitle; }
 522         function getOptions() { return $this->mOptions; }
 523         function getRevisionId() { return $this->mRevisionId; }
 524         function getOutput() { return $this->mOutput; }
 525         function nextLinkID() { return $this->mLinkID++; }
 526
 527         function getFunctionLang() {
 528                 global $wgLang, $wgContLang;
 529
 530                 $target = $this->mOptions->getTargetLanguage();
 531                 if ( $target !== null ) {
 532                         return $target;
 533                 } else {
 534                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 535                 }
 536         }
 537
 538         /**
 539          * Get a preprocessor object
 540          */
 541         function getPreprocessor() {
 542                 if ( !isset( $this->mPreprocessor ) ) {
 543                         $class = $this->mPreprocessorClass;
 544                         $this->mPreprocessor = new $class( $this );
 545                 }
 546                 return $this->mPreprocessor;
 547         }
 548
 549         /**
 550          * Replaces all occurrences of HTML-style comments and the given tags
 551          * in the text with a random marker and returns the next text. The output
 552          * parameter $matches will be an associative array filled with data in
 553          * the form:
 554          *   'UNIQ-xxxxx' => array(
 555          *     'element',
 556          *     'tag content',
 557          *     array( 'param' => 'x' ),
 558          *     '<element param="x">tag content</element>' ) )
 559          *
 560          * @param $elements list of element names. Comments are always extracted.
 561          * @param $text Source text string.
 562          * @param $uniq_prefix
 563          *
 564          * @public
 565          * @static
 566          */
 567         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 568                 static $n = 1;
 569                 $stripped = '';
 570                 $matches = array();
 571
 572                 $taglist = implode( '|', $elements );
 573                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 574
 575                 while ( $text != '' ) {
 576                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 577                         $stripped .= $p[0];
 578                         if( count( $p ) < 5 ) {
 579                                 break;
 580                         }
 581                         if( count( $p ) > 5 ) {
 582                                 // comment
 583                                 $element    = $p[4];
 584                                 $attributes = '';
 585                                 $close      = '';
 586                                 $inside     = $p[5];
 587                         } else {
 588                                 // tag
 589                                 $element    = $p[1];
 590                                 $attributes = $p[2];
 591                                 $close      = $p[3];
 592                                 $inside     = $p[4];
 593                         }
 594
 595                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 596                         $stripped .= $marker;
 597
 598                         if ( $close === '/>' ) {
 599                                 // Empty element tag, <tag />
 600                                 $content = null;
 601                                 $text = $inside;
 602                                 $tail = null;
 603                         } else {
 604                                 if( $element === '!--' ) {
 605                                         $end = '/(-->)/';
 606                                 } else {
 607                                         $end = "/(<\\/$element\\s*>)/i";
 608                                 }
 609                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 610                                 $content = $q[0];
 611                                 if( count( $q ) < 3 ) {
 612                                         # No end tag -- let it run out to the end of the text.
 613                                         $tail = '';
 614                                         $text = '';
 615                                 } else {
 616                                         $tail = $q[1];
 617                                         $text = $q[2];
 618                                 }
 619                         }
 620
 621                         $matches[$marker] = array( $element,
 622                                 $content,
 623                                 Sanitizer::decodeTagAttributes( $attributes ),
 624                                 "<$element$attributes$close$content$tail" );
 625                 }
 626                 return $stripped;
 627         }
 628
 629         /**
 630          * Get a list of strippable XML-like elements
 631          */
 632         function getStripList() {
 633                 return $this->mStripList;
 634         }
 635
 636         /**
 637          * @deprecated use replaceVariables
 638          */
 639         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 640                 return $text;
 641         }
 642
 643         /**
 644          * Restores pre, math, and other extensions removed by strip()
 645          *
 646          * always call unstripNoWiki() after this one
 647          * @private
 648          * @deprecated use $this->mStripState->unstrip()
 649          */
 650         function unstrip( $text, $state ) {
 651                 return $state->unstripGeneral( $text );
 652         }
 653
 654         /**
 655          * Always call this after unstrip() to preserve the order
 656          *
 657          * @private
 658          * @deprecated use $this->mStripState->unstrip()
 659          */
 660         function unstripNoWiki( $text, $state ) {
 661                 return $state->unstripNoWiki( $text );
 662         }
 663
 664         /**
 665          * @deprecated use $this->mStripState->unstripBoth()
 666          */
 667         function unstripForHTML( $text ) {
 668                 return $this->mStripState->unstripBoth( $text );
 669         }
 670
 671         /**
 672          * Add an item to the strip state
 673          * Returns the unique tag which must be inserted into the stripped text
 674          * The tag will be replaced with the original text in unstrip()
 675          *
 676          * @private
 677          */
 678         function insertStripItem( $text ) {
 679                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 680                 $this->mMarkerIndex++;
 681                 $this->mStripState->general->setPair( $rnd, $text );
 682                 return $rnd;
 683         }
 684
 685         /**
 686          * Interface with html tidy
 687          * @deprecated Use MWTidy::tidy()
 688          */
 689         public static function tidy( $text ) {
 690                 wfDeprecated( __METHOD__ );
 691                 return MWTidy::tidy( $text );
 692         }
 693
 694         /**
 695          * parse the wiki syntax used to render tables
 696          *
 697          * @private
 698          */
 699         function doTableStuff ( $text ) {
 700                 wfProfileIn( __METHOD__ );
 701
 702                 $lines = StringUtils::explode( "\n", $text );
 703                 $out = '';
 704                 $td_history = array (); // Is currently a td tag open?
 705                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 706                 $tr_history = array (); // Is currently a tr tag open?
 707                 $tr_attributes = array (); // history of tr attributes
 708                 $has_opened_tr = array(); // Did this table open a <tr> element?
 709                 $indent_level = 0; // indent level of the table
 710
 711                 foreach ( $lines as $outLine ) {
 712                         $line = trim( $outLine );
 713
 714                         if( $line == '' ) { // empty line, go to next line
 715                                 $out .= $outLine."\n";
 716                                 continue;
 717                         }
 718                         $first_character = $line[0];
 719                         $matches = array();
 720
 721                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 722                                 // First check if we are starting a new table
 723                                 $indent_level = strlen( $matches[1] );
 724
 725                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 726                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 727
 728                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 729                                 array_push( $td_history , false );
 730                                 array_push( $last_tag_history , '' );
 731                                 array_push( $tr_history , false );
 732                                 array_push( $tr_attributes , '' );
 733                                 array_push( $has_opened_tr , false );
 734                         } else if ( count ( $td_history ) == 0 ) {
 735                                 // Don't do any of the following
 736                                 $out .= $outLine."\n";
 737                                 continue;
 738                         } else if ( substr ( $line , 0 , 2 ) === '|}' ) {
 739                                 // We are ending a table
 740                                 $line = '</table>' . substr ( $line , 2 );
 741                                 $last_tag = array_pop ( $last_tag_history );
 742
 743                                 if ( !array_pop ( $has_opened_tr ) ) {
 744                                         $line = "<tr><td></td></tr>{$line}";
 745                                 }
 746
 747                                 if ( array_pop ( $tr_history ) ) {
 748                                         $line = "</tr>{$line}";
 749                                 }
 750
 751                                 if ( array_pop ( $td_history ) ) {
 752                                         $line = "</{$last_tag}>{$line}";
 753                                 }
 754                                 array_pop ( $tr_attributes );
 755                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 756                         } else if ( substr ( $line , 0 , 2 ) === '|-' ) {
 757                                 // Now we have a table row
 758                                 $line = preg_replace( '#^\|-+#', '', $line );
 759
 760                                 // Whats after the tag is now only attributes
 761                                 $attributes = $this->mStripState->unstripBoth( $line );
 762                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
 763                                 array_pop( $tr_attributes );
 764                                 array_push( $tr_attributes, $attributes );
 765
 766                                 $line = '';
 767                                 $last_tag = array_pop ( $last_tag_history );
 768                                 array_pop ( $has_opened_tr );
 769                                 array_push ( $has_opened_tr , true );
 770
 771                                 if ( array_pop ( $tr_history ) ) {
 772                                         $line = '</tr>';
 773                                 }
 774
 775                                 if ( array_pop ( $td_history ) ) {
 776                                         $line = "</{$last_tag}>{$line}";
 777                                 }
 778
 779                                 $outLine = $line;
 780                                 array_push ( $tr_history , false );
 781                                 array_push ( $td_history , false );
 782                                 array_push ( $last_tag_history , '' );
 783                         }
 784                         else if ( $first_character === '|' || $first_character === '!' || substr ( $line , 0 , 2 )  === '|+' ) {
 785                                 // This might be cell elements, td, th or captions
 786                                 if ( substr ( $line , 0 , 2 ) === '|+' ) {
 787                                         $first_character = '+';
 788                                         $line = substr ( $line , 1 );
 789                                 }
 790
 791                                 $line = substr ( $line , 1 );
 792
 793                                 if ( $first_character === '!' ) {
 794                                         $line = str_replace ( '!!' , '||' , $line );
 795                                 }
 796
 797                                 // Split up multiple cells on the same line.
 798                                 // FIXME : This can result in improper nesting of tags processed
 799                                 // by earlier parser steps, but should avoid splitting up eg
 800                                 // attribute values containing literal "||".
 801                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 802
 803                                 $outLine = '';
 804
 805                                 // Loop through each table cell
 806                                 foreach ( $cells as $cell )
 807                                 {
 808                                         $previous = '';
 809                                         if ( $first_character !== '+' )
 810                                         {
 811                                                 $tr_after = array_pop ( $tr_attributes );
 812                                                 if ( !array_pop ( $tr_history ) ) {
 813                                                         $previous = "<tr{$tr_after}>\n";
 814                                                 }
 815                                                 array_push ( $tr_history , true );
 816                                                 array_push ( $tr_attributes , '' );
 817                                                 array_pop ( $has_opened_tr );
 818                                                 array_push ( $has_opened_tr , true );
 819                                         }
 820
 821                                         $last_tag = array_pop ( $last_tag_history );
 822
 823                                         if ( array_pop ( $td_history ) ) {
 824                                                 $previous = "</{$last_tag}>{$previous}";
 825                                         }
 826
 827                                         if ( $first_character === '|' ) {
 828                                                 $last_tag = 'td';
 829                                         } else if ( $first_character === '!' ) {
 830                                                 $last_tag = 'th';
 831                                         } else if ( $first_character === '+' ) {
 832                                                 $last_tag = 'caption';
 833                                         } else {
 834                                                 $last_tag = '';
 835                                         }
 836
 837                                         array_push ( $last_tag_history , $last_tag );
 838
 839                                         // A cell could contain both parameters and data
 840                                         $cell_data = explode ( '|' , $cell , 2 );
 841
 842                                         // Bug 553: Note that a '|' inside an invalid link should not
 843                                         // be mistaken as delimiting cell parameters
 844                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 845                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 846                                         } else if ( count ( $cell_data ) == 1 )
 847                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 848                                         else {
 849                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 850                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 851                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 852                                         }
 853
 854                                         $outLine .= $cell;
 855                                         array_push ( $td_history , true );
 856                                 }
 857                         }
 858                         $out .= $outLine . "\n";
 859                 }
 860
 861                 // Closing open td, tr && table
 862                 while ( count ( $td_history ) > 0 )
 863                 {
 864                         if ( array_pop ( $td_history ) ) {
 865                                 $out .= "</td>\n";
 866                         }
 867                         if ( array_pop ( $tr_history ) ) {
 868                                 $out .= "</tr>\n";
 869                         }
 870                         if ( !array_pop ( $has_opened_tr ) ) {
 871                                 $out .= "<tr><td></td></tr>\n" ;
 872                         }
 873
 874                         $out .= "</table>\n";
 875                 }
 876
 877                 // Remove trailing line-ending (b/c)
 878                 if ( substr( $out, -1 ) === "\n" ) {
 879                         $out = substr( $out, 0, -1 );
 880                 }
 881
 882                 // special case: don't return empty table
 883                 if( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 884                         $out = '';
 885                 }
 886
 887                 wfProfileOut( __METHOD__ );
 888
 889                 return $out;
 890         }
 891
 892         /**
 893          * Helper function for parse() that transforms wiki markup into
 894          * HTML. Only called for $mOutputType == self::OT_HTML.
 895          *
 896          * @private
 897          */
 898         function internalParse( $text, $isMain = true, $frame=false ) {
 899                 wfProfileIn( __METHOD__ );
 900
 901                 $origText = $text;
 902
 903                 # Hook to suspend the parser in this state
 904                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 905                         wfProfileOut( __METHOD__ );
 906                         return $text ;
 907                 }
 908
 909                 // if $frame is provided, then use $frame for replacing any variables
 910                 if ($frame) {
 911                         // use frame depth to infer how include/noinclude tags should be handled
 912                         // depth=0 means this is the top-level document; otherwise it's an included document
 913                         if( !$frame->depth )
 914                                 $flag = 0;
 915                         else
 916                                 $flag = Parser::PTD_FOR_INCLUSION;
 917                         $dom = $this->preprocessToDom( $text, $flag );
 918                         $text = $frame->expand( $dom );
 919                 }
 920                 // if $frame is not provided, then use old-style replaceVariables
 921                 else {
 922                         $text = $this->replaceVariables( $text );
 923                 }
 924
 925                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 926                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 927
 928                 // Tables need to come after variable replacement for things to work
 929                 // properly; putting them before other transformations should keep
 930                 // exciting things like link expansions from showing up in surprising
 931                 // places.
 932                 $text = $this->doTableStuff( $text );
 933
 934                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 935
 936                 $text = $this->doDoubleUnderscore( $text );
 937
 938                 $text = $this->doHeadings( $text );
 939                 if( $this->mOptions->getUseDynamicDates() ) {
 940                         $df = DateFormatter::getInstance();
 941                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 942                 }
 943                 $text = $this->doAllQuotes( $text );
 944                 $text = $this->replaceInternalLinks( $text );
 945                 $text = $this->replaceExternalLinks( $text );
 946
 947                 # replaceInternalLinks may sometimes leave behind
 948                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 949                 $text = str_replace($this->mUniqPrefix.'NOPARSE', '', $text);
 950
 951                 $text = $this->doMagicLinks( $text );
 952                 $text = $this->formatHeadings( $text, $origText, $isMain );
 953
 954                 wfProfileOut( __METHOD__ );
 955                 return $text;
 956         }
 957
 958         /**
 959          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 960          * magic external links.
 961          *
 962          * DML
 963          * @private
 964          */
 965         function doMagicLinks( $text ) {
 966                 wfProfileIn( __METHOD__ );
 967                 $prots = $this->mUrlProtocols;
 968                 $urlChar = self::EXT_LINK_URL_CLASS;
 969                 $text = preg_replace_callback(
 970                         '!(?:                           # Start cases
 971                                 (<a.*?</a>) |               # m[1]: Skip link text
 972                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
 973                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
 974                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
 975                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
 976                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 977                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 978                                     [0-9Xx]                 # check digit
 979                                     \b)
 980                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 981                 wfProfileOut( __METHOD__ );
 982                 return $text;
 983         }
 984
 985         function magicLinkCallback( $m ) {
 986                 if ( isset( $m[1] ) && $m[1] !== '' ) {
 987                         # Skip anchor
 988                         return $m[0];
 989                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
 990                         # Skip HTML element
 991                         return $m[0];
 992                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
 993                         # Free external link
 994                         return $this->makeFreeExternalLink( $m[0] );
 995                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
 996                         # RFC or PMID
 997                         $CssClass = '';
 998                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
 999                                 $keyword = 'RFC';
1000                                 $urlmsg = 'rfcurl';
1001                                 $CssClass = 'mw-magiclink-rfc';
1002                                 $id = $m[4];
1003                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1004                                 $keyword = 'PMID';
1005                                 $urlmsg = 'pubmedurl';
1006                                 $CssClass = 'mw-magiclink-pmid';
1007                                 $id = $m[4];
1008                         } else {
1009                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1010                                         substr($m[0], 0, 20 ) . '"' );
1011                         }
1012                         $url = wfMsg( $urlmsg, $id);
1013                         $sk = $this->mOptions->getSkin();
1014                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
1015                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1016                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1017                         # ISBN
1018                         $isbn = $m[5];
1019                         $num = strtr( $isbn, array(
1020                                 '-' => '',
1021                                 ' ' => '',
1022                                 'x' => 'X',
1023                         ));
1024                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1025                         return'<a href="' .
1026                                 $titleObj->escapeLocalUrl() .
1027                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1028                 } else {
1029                         return $m[0];
1030                 }
1031         }
1032
1033         /**
1034          * Make a free external link, given a user-supplied URL
1035          * @return HTML
1036          * @private
1037          */
1038         function makeFreeExternalLink( $url ) {
1039                 global $wgContLang;
1040                 wfProfileIn( __METHOD__ );
1041
1042                 $sk = $this->mOptions->getSkin();
1043                 $trail = '';
1044
1045                 # The characters '<' and '>' (which were escaped by
1046                 # removeHTMLtags()) should not be included in
1047                 # URLs, per RFC 2396.
1048                 $m2 = array();
1049                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1050                         $trail = substr($url, $m2[0][1]) . $trail;
1051                         $url = substr($url, 0, $m2[0][1]);
1052                 }
1053
1054                 # Move trailing punctuation to $trail
1055                 $sep = ',;\.:!?';
1056                 # If there is no left bracket, then consider right brackets fair game too
1057                 if ( strpos( $url, '(' ) === false ) {
1058                         $sep .= ')';
1059                 }
1060
1061                 $numSepChars = strspn( strrev( $url ), $sep );
1062                 if ( $numSepChars ) {
1063                         $trail = substr( $url, -$numSepChars ) . $trail;
1064                         $url = substr( $url, 0, -$numSepChars );
1065                 }
1066
1067                 $url = Sanitizer::cleanUrl( $url );
1068
1069                 # Is this an external image?
1070                 $text = $this->maybeMakeExternalImage( $url );
1071                 if ( $text === false ) {
1072                         # Not an image, make a link
1073                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1074                                 $this->getExternalLinkAttribs( $url ) );
1075                         # Register it in the output object...
1076                         # Replace unnecessary URL escape codes with their equivalent characters
1077                         $pasteurized = self::replaceUnusualEscapes( $url );
1078                         $this->mOutput->addExternalLink( $pasteurized );
1079                 }
1080                 wfProfileOut( __METHOD__ );
1081                 return $text . $trail;
1082         }
1083
1084
1085         /**
1086          * Parse headers and return html
1087          *
1088          * @private
1089          */
1090         function doHeadings( $text ) {
1091                 wfProfileIn( __METHOD__ );
1092                 for ( $i = 6; $i >= 1; --$i ) {
1093                         $h = str_repeat( '=', $i );
1094                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1095                           "<h$i>\\1</h$i>", $text );
1096                 }
1097                 wfProfileOut( __METHOD__ );
1098                 return $text;
1099         }
1100
1101         /**
1102          * Replace single quotes with HTML markup
1103          * @private
1104          * @return string the altered text
1105          */
1106         function doAllQuotes( $text ) {
1107                 wfProfileIn( __METHOD__ );
1108                 $outtext = '';
1109                 $lines = StringUtils::explode( "\n", $text );
1110                 foreach ( $lines as $line ) {
1111                         $outtext .= $this->doQuotes( $line ) . "\n";
1112                 }
1113                 $outtext = substr($outtext, 0,-1);
1114                 wfProfileOut( __METHOD__ );
1115                 return $outtext;
1116         }
1117
1118         /**
1119          * Helper function for doAllQuotes()
1120          */
1121         public function doQuotes( $text ) {
1122                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1123                 if ( count( $arr ) == 1 )
1124                         return $text;
1125                 else
1126                 {
1127                         # First, do some preliminary work. This may shift some apostrophes from
1128                         # being mark-up to being text. It also counts the number of occurrences
1129                         # of bold and italics mark-ups.
1130                         $i = 0;
1131                         $numbold = 0;
1132                         $numitalics = 0;
1133                         foreach ( $arr as $r )
1134                         {
1135                                 if ( ( $i % 2 ) == 1 )
1136                                 {
1137                                         # If there are ever four apostrophes, assume the first is supposed to
1138                                         # be text, and the remaining three constitute mark-up for bold text.
1139                                         if ( strlen( $arr[$i] ) == 4 )
1140                                         {
1141                                                 $arr[$i-1] .= "'";
1142                                                 $arr[$i] = "'''";
1143                                         }
1144                                         # If there are more than 5 apostrophes in a row, assume they're all
1145                                         # text except for the last 5.
1146                                         else if ( strlen( $arr[$i] ) > 5 )
1147                                         {
1148                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1149                                                 $arr[$i] = "'''''";
1150                                         }
1151                                         # Count the number of occurrences of bold and italics mark-ups.
1152                                         # We are not counting sequences of five apostrophes.
1153                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1154                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1155                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1156                                 }
1157                                 $i++;
1158                         }
1159
1160                         # If there is an odd number of both bold and italics, it is likely
1161                         # that one of the bold ones was meant to be an apostrophe followed
1162                         # by italics. Which one we cannot know for certain, but it is more
1163                         # likely to be one that has a single-letter word before it.
1164                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1165                         {
1166                                 $i = 0;
1167                                 $firstsingleletterword = -1;
1168                                 $firstmultiletterword = -1;
1169                                 $firstspace = -1;
1170                                 foreach ( $arr as $r )
1171                                 {
1172                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1173                                         {
1174                                                 $x1 = substr ($arr[$i-1], -1);
1175                                                 $x2 = substr ($arr[$i-1], -2, 1);
1176                                                 if ($x1 === ' ') {
1177                                                         if ($firstspace == -1) $firstspace = $i;
1178                                                 } else if ($x2 === ' ') {
1179                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1180                                                 } else {
1181                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1182                                                 }
1183                                         }
1184                                         $i++;
1185                                 }
1186
1187                                 # If there is a single-letter word, use it!
1188                                 if ($firstsingleletterword > -1)
1189                                 {
1190                                         $arr [ $firstsingleletterword ] = "''";
1191                                         $arr [ $firstsingleletterword-1 ] .= "'";
1192                                 }
1193                                 # If not, but there's a multi-letter word, use that one.
1194                                 else if ($firstmultiletterword > -1)
1195                                 {
1196                                         $arr [ $firstmultiletterword ] = "''";
1197                                         $arr [ $firstmultiletterword-1 ] .= "'";
1198                                 }
1199                                 # ... otherwise use the first one that has neither.
1200                                 # (notice that it is possible for all three to be -1 if, for example,
1201                                 # there is only one pentuple-apostrophe in the line)
1202                                 else if ($firstspace > -1)
1203                                 {
1204                                         $arr [ $firstspace ] = "''";
1205                                         $arr [ $firstspace-1 ] .= "'";
1206                                 }
1207                         }
1208
1209                         # Now let's actually convert our apostrophic mush to HTML!
1210                         $output = '';
1211                         $buffer = '';
1212                         $state = '';
1213                         $i = 0;
1214                         foreach ($arr as $r)
1215                         {
1216                                 if (($i % 2) == 0)
1217                                 {
1218                                         if ($state === 'both')
1219                                                 $buffer .= $r;
1220                                         else
1221                                                 $output .= $r;
1222                                 }
1223                                 else
1224                                 {
1225                                         if (strlen ($r) == 2)
1226                                         {
1227                                                 if ($state === 'i')
1228                                                 { $output .= '</i>'; $state = ''; }
1229                                                 else if ($state === 'bi')
1230                                                 { $output .= '</i>'; $state = 'b'; }
1231                                                 else if ($state === 'ib')
1232                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1233                                                 else if ($state === 'both')
1234                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1235                                                 else # $state can be 'b' or ''
1236                                                 { $output .= '<i>'; $state .= 'i'; }
1237                                         }
1238                                         else if (strlen ($r) == 3)
1239                                         {
1240                                                 if ($state === 'b')
1241                                                 { $output .= '</b>'; $state = ''; }
1242                                                 else if ($state === 'bi')
1243                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1244                                                 else if ($state === 'ib')
1245                                                 { $output .= '</b>'; $state = 'i'; }
1246                                                 else if ($state === 'both')
1247                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1248                                                 else # $state can be 'i' or ''
1249                                                 { $output .= '<b>'; $state .= 'b'; }
1250                                         }
1251                                         else if (strlen ($r) == 5)
1252                                         {
1253                                                 if ($state === 'b')
1254                                                 { $output .= '</b><i>'; $state = 'i'; }
1255                                                 else if ($state === 'i')
1256                                                 { $output .= '</i><b>'; $state = 'b'; }
1257                                                 else if ($state === 'bi')
1258                                                 { $output .= '</i></b>'; $state = ''; }
1259                                                 else if ($state === 'ib')
1260                                                 { $output .= '</b></i>'; $state = ''; }
1261                                                 else if ($state === 'both')
1262                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1263                                                 else # ($state == '')
1264                                                 { $buffer = ''; $state = 'both'; }
1265                                         }
1266                                 }
1267                                 $i++;
1268                         }
1269                         # Now close all remaining tags.  Notice that the order is important.
1270                         if ($state === 'b' || $state === 'ib')
1271                                 $output .= '</b>';
1272                         if ($state === 'i' || $state === 'bi' || $state === 'ib')
1273                                 $output .= '</i>';
1274                         if ($state === 'bi')
1275                                 $output .= '</b>';
1276                         # There might be lonely ''''', so make sure we have a buffer
1277                         if ($state === 'both' && $buffer)
1278                                 $output .= '<b><i>'.$buffer.'</i></b>';
1279                         return $output;
1280                 }
1281         }
1282
1283         /**
1284          * Replace external links (REL)
1285          *
1286          * Note: this is all very hackish and the order of execution matters a lot.
1287          * Make sure to run maintenance/parserTests.php if you change this code.
1288          *
1289          * @private
1290          */
1291         function replaceExternalLinks( $text ) {
1292                 global $wgContLang;
1293                 wfProfileIn( __METHOD__ );
1294
1295                 $sk = $this->mOptions->getSkin();
1296
1297                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1298                 $s = array_shift( $bits );
1299
1300                 $i = 0;
1301                 while ( $i<count( $bits ) ) {
1302                         $url = $bits[$i++];
1303                         $protocol = $bits[$i++];
1304                         $text = $bits[$i++];
1305                         $trail = $bits[$i++];
1306
1307                         # The characters '<' and '>' (which were escaped by
1308                         # removeHTMLtags()) should not be included in
1309                         # URLs, per RFC 2396.
1310                         $m2 = array();
1311                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1312                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1313                                 $url = substr($url, 0, $m2[0][1]);
1314                         }
1315
1316                         # If the link text is an image URL, replace it with an <img> tag
1317                         # This happened by accident in the original parser, but some people used it extensively
1318                         $img = $this->maybeMakeExternalImage( $text );
1319                         if ( $img !== false ) {
1320                                 $text = $img;
1321                         }
1322
1323                         $dtrail = '';
1324
1325                         # Set linktype for CSS - if URL==text, link is essentially free
1326                         $linktype = ($text === $url) ? 'free' : 'text';
1327
1328                         # No link text, e.g. [http://domain.tld/some.link]
1329                         if ( $text == '' ) {
1330                                 # Autonumber if allowed. See bug #5918
1331                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1332                                         $langObj = $this->getFunctionLang();
1333                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1334                                         $linktype = 'autonumber';
1335                                 } else {
1336                                         # Otherwise just use the URL
1337                                         $text = htmlspecialchars( $url );
1338                                         $linktype = 'free';
1339                                 }
1340                         } else {
1341                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1342                                 # Check for trail
1343                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1344                         }
1345
1346                         $text = $wgContLang->markNoConversion($text);
1347
1348                         $url = Sanitizer::cleanUrl( $url );
1349
1350                         # Use the encoded URL
1351                         # This means that users can paste URLs directly into the text
1352                         # Funny characters like &ouml; aren't valid in URLs anyway
1353                         # This was changed in August 2004
1354                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1355                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1356
1357                         # Register link in the output object.
1358                         # Replace unnecessary URL escape codes with the referenced character
1359                         # This prevents spammers from hiding links from the filters
1360                         $pasteurized = self::replaceUnusualEscapes( $url );
1361                         $this->mOutput->addExternalLink( $pasteurized );
1362                 }
1363
1364                 wfProfileOut( __METHOD__ );
1365                 return $s;
1366         }
1367
1368         /**
1369          * Get an associative array of additional HTML attributes appropriate for a
1370          * particular external link.  This currently may include rel => nofollow
1371          * (depending on configuration, namespace, and the URL's domain) and/or a
1372          * target attribute (depending on configuration).
1373          *
1374          * @param string $url Optional URL, to extract the domain from for rel =>
1375          *   nofollow if appropriate
1376          * @return array Associative array of HTML attributes
1377          */
1378         function getExternalLinkAttribs( $url = false ) {
1379                 $attribs = array();
1380                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1381                 $ns = $this->mTitle->getNamespace();
1382                 if( $wgNoFollowLinks && !in_array($ns, $wgNoFollowNsExceptions) ) {
1383                         $attribs['rel'] = 'nofollow';
1384
1385                         global $wgNoFollowDomainExceptions;
1386                         if ( $wgNoFollowDomainExceptions ) {
1387                                 $bits = wfParseUrl( $url );
1388                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1389                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1390                                                 if( substr( $bits['host'], -strlen( $domain ) )
1391                                                 == $domain ) {
1392                                                         unset( $attribs['rel'] );
1393                                                         break;
1394                                                 }
1395                                         }
1396                                 }
1397                         }
1398                 }
1399                 if ( $this->mOptions->getExternalLinkTarget() ) {
1400                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1401                 }
1402                 return $attribs;
1403         }
1404
1405
1406         /**
1407          * Replace unusual URL escape codes with their equivalent characters
1408          * @param string
1409          * @return string
1410          * @static
1411          * @todo  This can merge genuinely required bits in the path or query string,
1412          *        breaking legit URLs. A proper fix would treat the various parts of
1413          *        the URL differently; as a workaround, just use the output for
1414          *        statistical records, not for actual linking/output.
1415          */
1416         static function replaceUnusualEscapes( $url ) {
1417                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1418                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1419         }
1420
1421         /**
1422          * Callback function used in replaceUnusualEscapes().
1423          * Replaces unusual URL escape codes with their equivalent character
1424          * @static
1425          * @private
1426          */
1427         private static function replaceUnusualEscapesCallback( $matches ) {
1428                 $char = urldecode( $matches[0] );
1429                 $ord = ord( $char );
1430                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1431                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1432                         // No, shouldn't be escaped
1433                         return $char;
1434                 } else {
1435                         // Yes, leave it escaped
1436                         return $matches[0];
1437                 }
1438         }
1439
1440         /**
1441          * make an image if it's allowed, either through the global
1442          * option, through the exception, or through the on-wiki whitelist
1443          * @private
1444          */
1445         function maybeMakeExternalImage( $url ) {
1446                 $sk = $this->mOptions->getSkin();
1447                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1448                 $imagesexception = !empty($imagesfrom);
1449                 $text = false;
1450                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1451                 if( $imagesexception && is_array( $imagesfrom ) ) {
1452                         $imagematch = false;
1453                         foreach( $imagesfrom as $match ) {
1454                                 if( strpos( $url, $match ) === 0 ) {
1455                                         $imagematch = true;
1456                                         break;
1457                                 }
1458                         }
1459                 } elseif( $imagesexception ) {
1460                         $imagematch = (strpos( $url, $imagesfrom ) === 0);
1461                 } else {
1462                         $imagematch = false;
1463                 }
1464                 if ( $this->mOptions->getAllowExternalImages()
1465                      || ( $imagesexception && $imagematch ) ) {
1466                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1467                                 # Image found
1468                                 $text = $sk->makeExternalImage( $url );
1469                         }
1470                 }
1471                 if( !$text && $this->mOptions->getEnableImageWhitelist()
1472                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1473                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1474                         foreach( $whitelist as $entry ) {
1475                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1476                                 if( strpos( $entry, '#' ) === 0 || $entry === '' )
1477                                         continue;
1478                                 if( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1479                                         # Image matches a whitelist entry
1480                                         $text = $sk->makeExternalImage( $url );
1481                                         break;
1482                                 }
1483                         }
1484                 }
1485                 return $text;
1486         }
1487
1488         /**
1489          * Process [[ ]] wikilinks
1490          * @return processed text
1491          *
1492          * @private
1493          */
1494         function replaceInternalLinks( $s ) {
1495                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1496                 return $s;
1497         }
1498
1499         /**
1500          * Process [[ ]] wikilinks (RIL)
1501          * @return LinkHolderArray
1502          *
1503          * @private
1504          */
1505         function replaceInternalLinks2( &$s ) {
1506                 global $wgContLang;
1507
1508                 wfProfileIn( __METHOD__ );
1509
1510                 wfProfileIn( __METHOD__.'-setup' );
1511                 static $tc = FALSE, $e1, $e1_img;
1512                 # the % is needed to support urlencoded titles as well
1513                 if ( !$tc ) {
1514                         $tc = Title::legalChars() . '#%';
1515                         # Match a link having the form [[namespace:link|alternate]]trail
1516                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1517                         # Match cases where there is no "]]", which might still be images
1518                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1519                 }
1520
1521                 $sk = $this->mOptions->getSkin();
1522                 $holders = new LinkHolderArray( $this );
1523
1524                 #split the entire text string on occurences of [[
1525                 $a = StringUtils::explode( '[[', ' ' . $s );
1526                 #get the first element (all text up to first [[), and remove the space we added
1527                 $s = $a->current();
1528                 $a->next();
1529                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1530                 $s = substr( $s, 1 );
1531
1532                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1533                 $e2 = null;
1534                 if ( $useLinkPrefixExtension ) {
1535                         # Match the end of a line for a word that's not followed by whitespace,
1536                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1537                         $e2 = wfMsgForContent( 'linkprefix' );
1538                 }
1539
1540                 if( is_null( $this->mTitle ) ) {
1541                         wfProfileOut( __METHOD__.'-setup' );
1542                         wfProfileOut( __METHOD__ );
1543                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1544                 }
1545                 $nottalk = !$this->mTitle->isTalkPage();
1546
1547                 if ( $useLinkPrefixExtension ) {
1548                         $m = array();
1549                         if ( preg_match( $e2, $s, $m ) ) {
1550                                 $first_prefix = $m[2];
1551                         } else {
1552                                 $first_prefix = false;
1553                         }
1554                 } else {
1555                         $prefix = '';
1556                 }
1557
1558                 if($wgContLang->hasVariants()) {
1559                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1560                 } else {
1561                         $selflink = array($this->mTitle->getPrefixedText());
1562                 }
1563                 $useSubpages = $this->areSubpagesAllowed();
1564                 wfProfileOut( __METHOD__.'-setup' );
1565
1566                 # Loop for each link
1567                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1568                         # Check for excessive memory usage
1569                         if ( $holders->isBig() ) {
1570                                 # Too big
1571                                 # Do the existence check, replace the link holders and clear the array
1572                                 $holders->replace( $s );
1573                                 $holders->clear();
1574                         }
1575
1576                         if ( $useLinkPrefixExtension ) {
1577                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1578                                 if ( preg_match( $e2, $s, $m ) ) {
1579                                         $prefix = $m[2];
1580                                         $s = $m[1];
1581                                 } else {
1582                                         $prefix='';
1583                                 }
1584                                 # first link
1585                                 if($first_prefix) {
1586                                         $prefix = $first_prefix;
1587                                         $first_prefix = false;
1588                                 }
1589                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1590                         }
1591
1592                         $might_be_img = false;
1593
1594                         wfProfileIn( __METHOD__."-e1" );
1595                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1596                                 $text = $m[2];
1597                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1598                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1599                                 # the real problem is with the $e1 regex
1600                                 # See bug 1300.
1601                                 #
1602                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1603                                 # and no image is in sight. See bug 2095.
1604                                 #
1605                                 if( $text !== '' &&
1606                                         substr( $m[3], 0, 1 ) === ']' &&
1607                                         strpos($text, '[') !== false
1608                                 )
1609                                 {
1610                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1611                                         $m[3] = substr( $m[3], 1 );
1612                                 }
1613                                 # fix up urlencoded title texts
1614                                 if( strpos( $m[1], '%' ) !== false ) {
1615                                         # Should anchors '#' also be rejected?
1616                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1617                                 }
1618                                 $trail = $m[3];
1619                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1620                                 $might_be_img = true;
1621                                 $text = $m[2];
1622                                 if ( strpos( $m[1], '%' ) !== false ) {
1623                                         $m[1] = urldecode($m[1]);
1624                                 }
1625                                 $trail = "";
1626                         } else { # Invalid form; output directly
1627                                 $s .= $prefix . '[[' . $line ;
1628                                 wfProfileOut( __METHOD__."-e1" );
1629                                 continue;
1630                         }
1631                         wfProfileOut( __METHOD__."-e1" );
1632                         wfProfileIn( __METHOD__."-misc" );
1633
1634                         # Don't allow internal links to pages containing
1635                         # PROTO: where PROTO is a valid URL protocol; these
1636                         # should be external links.
1637                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1638                                 $s .= $prefix . '[[' . $line ;
1639                                 wfProfileOut( __METHOD__."-misc" );
1640                                 continue;
1641                         }
1642
1643                         # Make subpage if necessary
1644                         if ( $useSubpages ) {
1645                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1646                         } else {
1647                                 $link = $m[1];
1648                         }
1649
1650                         $noforce = (substr( $m[1], 0, 1 ) !== ':');
1651                         if (!$noforce) {
1652                                 # Strip off leading ':'
1653                                 $link = substr( $link, 1 );
1654                         }
1655
1656                         wfProfileOut( __METHOD__."-misc" );
1657                         wfProfileIn( __METHOD__."-title" );
1658                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1659                         if ( $nt === null ) {
1660                                 $s .= $prefix . '[[' . $line;
1661                                 wfProfileOut( __METHOD__."-title" );
1662                                 continue;
1663                         }
1664
1665                         $ns = $nt->getNamespace();
1666                         $iw = $nt->getInterWiki();
1667                         wfProfileOut( __METHOD__."-title" );
1668
1669                         if ( $might_be_img ) { # if this is actually an invalid link
1670                                 wfProfileIn( __METHOD__."-might_be_img" );
1671                                 if ( $ns == NS_FILE && $noforce ) { #but might be an image
1672                                         $found = false;
1673                                         while ( true ) {
1674                                                 #look at the next 'line' to see if we can close it there
1675                                                 $a->next();
1676                                                 $next_line = $a->current();
1677                                                 if ( $next_line === false || $next_line === null ) {
1678                                                         break;
1679                                                 }
1680                                                 $m = explode( ']]', $next_line, 3 );
1681                                                 if ( count( $m ) == 3 ) {
1682                                                         # the first ]] closes the inner link, the second the image
1683                                                         $found = true;
1684                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1685                                                         $trail = $m[2];
1686                                                         break;
1687                                                 } elseif ( count( $m ) == 2 ) {
1688                                                         #if there's exactly one ]] that's fine, we'll keep looking
1689                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1690                                                 } else {
1691                                                         #if $next_line is invalid too, we need look no further
1692                                                         $text .= '[[' . $next_line;
1693                                                         break;
1694                                                 }
1695                                         }
1696                                         if ( !$found ) {
1697                                                 # we couldn't find the end of this imageLink, so output it raw
1698                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1699                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1700                                                 $s .= "{$prefix}[[$link|$text";
1701                                                 # note: no $trail, because without an end, there *is* no trail
1702                                                 wfProfileOut( __METHOD__."-might_be_img" );
1703                                                 continue;
1704                                         }
1705                                 } else { #it's not an image, so output it raw
1706                                         $s .= "{$prefix}[[$link|$text";
1707                                         # note: no $trail, because without an end, there *is* no trail
1708                                         wfProfileOut( __METHOD__."-might_be_img" );
1709                                         continue;
1710                                 }
1711                                 wfProfileOut( __METHOD__."-might_be_img" );
1712                         }
1713
1714                         $wasblank = ( $text  == '' );
1715                         if ( $wasblank ) $text = $link;
1716
1717                         # Link not escaped by : , create the various objects
1718                         if ( $noforce ) {
1719
1720                                 # Interwikis
1721                                 wfProfileIn( __METHOD__."-interwiki" );
1722                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1723                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1724                                         $s = rtrim($s . $prefix);
1725                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1726                                         wfProfileOut( __METHOD__."-interwiki" );
1727                                         continue;
1728                                 }
1729                                 wfProfileOut( __METHOD__."-interwiki" );
1730
1731                                 if ( $ns == NS_FILE ) {
1732                                         wfProfileIn( __METHOD__."-image" );
1733                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1734                                                 if ( $wasblank ) {
1735                                                         # if no parameters were passed, $text
1736                                                         # becomes something like "File:Foo.png",
1737                                                         # which we don't want to pass on to the
1738                                                         # image generator
1739                                                         $text = '';
1740                                                 } else {
1741                                                         # recursively parse links inside the image caption
1742                                                         # actually, this will parse them in any other parameters, too,
1743                                                         # but it might be hard to fix that, and it doesn't matter ATM
1744                                                         $text = $this->replaceExternalLinks($text);
1745                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1746                                                 }
1747                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1748                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1749                                         } else {
1750                                                 $s .= $prefix . $trail;
1751                                         }
1752                                         $this->mOutput->addImage( $nt->getDBkey() );
1753                                         wfProfileOut( __METHOD__."-image" );
1754                                         continue;
1755
1756                                 }
1757
1758                                 if ( $ns == NS_CATEGORY ) {
1759                                         wfProfileIn( __METHOD__."-category" );
1760                                         $s = rtrim($s . "\n"); # bug 87
1761
1762                                         if ( $wasblank ) {
1763                                                 $sortkey = $this->getDefaultSort();
1764                                         } else {
1765                                                 $sortkey = $text;
1766                                         }
1767                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1768                                         $sortkey = str_replace( "\n", '', $sortkey );
1769                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1770                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1771
1772                                         /**
1773                                          * Strip the whitespace Category links produce, see bug 87
1774                                          * @todo We might want to use trim($tmp, "\n") here.
1775                                          */
1776                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1777
1778                                         wfProfileOut( __METHOD__."-category" );
1779                                         continue;
1780                                 }
1781                         }
1782
1783                         # Self-link checking
1784                         if( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1785                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1786                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1787                                         continue;
1788                                 }
1789                         }
1790
1791                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1792                         # FIXME: Should do batch file existence checks, see comment below
1793                         if( $ns == NS_MEDIA ) {
1794                                 wfProfileIn( __METHOD__."-media" );
1795                                 # Give extensions a chance to select the file revision for us
1796                                 $skip = $time = false;
1797                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1798                                 if ( $skip ) {
1799                                         $link = $sk->link( $nt );
1800                                 } else {
1801                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1802                                 }
1803                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1804                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1805                                 $this->mOutput->addImage( $nt->getDBkey() );
1806                                 wfProfileOut( __METHOD__."-media" );
1807                                 continue;
1808                         }
1809
1810                         wfProfileIn( __METHOD__."-always_known" );
1811                         # Some titles, such as valid special pages or files in foreign repos, should
1812                         # be shown as bluelinks even though they're not included in the page table
1813                         #
1814                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1815                         # batch file existence checks for NS_FILE and NS_MEDIA
1816                         if( $iw == '' && $nt->isAlwaysKnown() ) {
1817                                 $this->mOutput->addLink( $nt );
1818                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1819                         } else {
1820                                 # Links will be added to the output link list after checking
1821                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1822                         }
1823                         wfProfileOut( __METHOD__."-always_known" );
1824                 }
1825                 wfProfileOut( __METHOD__ );
1826                 return $holders;
1827         }
1828
1829         /**
1830          * Make a link placeholder. The text returned can be later resolved to a real link with
1831          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1832          * parsing of interwiki links, and secondly to allow all existence checks and
1833          * article length checks (for stub links) to be bundled into a single query.
1834          *
1835          * @deprecated
1836          */
1837         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1838                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1839         }
1840
1841         /**
1842          * Render a forced-blue link inline; protect against double expansion of
1843          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1844          * Since this little disaster has to split off the trail text to avoid
1845          * breaking URLs in the following text without breaking trails on the
1846          * wiki links, it's been made into a horrible function.
1847          *
1848          * @param Title $nt
1849          * @param string $text
1850          * @param string $query
1851          * @param string $trail
1852          * @param string $prefix
1853          * @return string HTML-wikitext mix oh yuck
1854          */
1855         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1856                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1857                 $sk = $this->mOptions->getSkin();
1858                 // FIXME: use link() instead of deprecated makeKnownLinkObj()
1859                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1860                 return $this->armorLinks( $link ) . $trail;
1861         }
1862
1863         /**
1864          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1865          * going to go through further parsing steps before inline URL expansion.
1866          *
1867          * Not needed quite as much as it used to be since free links are a bit
1868          * more sensible these days. But bracketed links are still an issue.
1869          *
1870          * @param string more-or-less HTML
1871          * @return string less-or-more HTML with NOPARSE bits
1872          */
1873         function armorLinks( $text ) {
1874                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1875                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1876         }
1877
1878         /**
1879          * Return true if subpage links should be expanded on this page.
1880          * @return bool
1881          */
1882         function areSubpagesAllowed() {
1883                 # Some namespaces don't allow subpages
1884                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1885         }
1886
1887         /**
1888          * Handle link to subpage if necessary
1889          * @param string $target the source of the link
1890          * @param string &$text the link text, modified as necessary
1891          * @return string the full name of the link
1892          * @private
1893          */
1894         function maybeDoSubpageLink($target, &$text) {
1895                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1896         }
1897
1898         /**#@+
1899          * Used by doBlockLevels()
1900          * @private
1901          */
1902         /* private */ function closeParagraph() {
1903                 $result = '';
1904                 if ( $this->mLastSection != '' ) {
1905                         $result = '</' . $this->mLastSection  . ">\n";
1906                 }
1907                 $this->mInPre = false;
1908                 $this->mLastSection = '';
1909                 return $result;
1910         }
1911         # getCommon() returns the length of the longest common substring
1912         # of both arguments, starting at the beginning of both.
1913         #
1914         /* private */ function getCommon( $st1, $st2 ) {
1915                 $fl = strlen( $st1 );
1916                 $shorter = strlen( $st2 );
1917                 if ( $fl < $shorter ) { $shorter = $fl; }
1918
1919                 for ( $i = 0; $i < $shorter; ++$i ) {
1920                         if ( $st1{$i} != $st2{$i} ) { break; }
1921                 }
1922                 return $i;
1923         }
1924         # These next three functions open, continue, and close the list
1925         # element appropriate to the prefix character passed into them.
1926         #
1927         /* private */ function openList( $char ) {
1928                 $result = $this->closeParagraph();
1929
1930                 if ( '*' === $char ) { $result .= '<ul><li>'; }
1931                 elseif ( '#' === $char ) { $result .= '<ol><li>'; }
1932                 elseif ( ':' === $char ) { $result .= '<dl><dd>'; }
1933                 elseif ( ';' === $char ) {
1934                         $result .= '<dl><dt>';
1935                         $this->mDTopen = true;
1936                 }
1937                 else { $result = '<!-- ERR 1 -->'; }
1938
1939                 return $result;
1940         }
1941
1942         /* private */ function nextItem( $char ) {
1943                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
1944                 elseif ( ':' === $char || ';' === $char ) {
1945                         $close = '</dd>';
1946                         if ( $this->mDTopen ) { $close = '</dt>'; }
1947                         if ( ';' === $char ) {
1948                                 $this->mDTopen = true;
1949                                 return $close . '<dt>';
1950                         } else {
1951                                 $this->mDTopen = false;
1952                                 return $close . '<dd>';
1953                         }
1954                 }
1955                 return '<!-- ERR 2 -->';
1956         }
1957
1958         /* private */ function closeList( $char ) {
1959                 if ( '*' === $char ) { $text = '</li></ul>'; }
1960                 elseif ( '#' === $char ) { $text = '</li></ol>'; }
1961                 elseif ( ':' === $char ) {
1962                         if ( $this->mDTopen ) {
1963                                 $this->mDTopen = false;
1964                                 $text = '</dt></dl>';
1965                         } else {
1966                                 $text = '</dd></dl>';
1967                         }
1968                 }
1969                 else {  return '<!-- ERR 3 -->'; }
1970                 return $text."\n";
1971         }
1972         /**#@-*/
1973
1974         /**
1975          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
1976          *
1977          * @param $linestart bool whether or not this is at the start of a line.
1978          * @private
1979          * @return string the lists rendered as HTML
1980          */
1981         function doBlockLevels( $text, $linestart ) {
1982                 wfProfileIn( __METHOD__ );
1983
1984                 # Parsing through the text line by line.  The main thing
1985                 # happening here is handling of block-level elements p, pre,
1986                 # and making lists from lines starting with * # : etc.
1987                 #
1988                 $textLines = StringUtils::explode( "\n", $text );
1989
1990                 $lastPrefix = $output = '';
1991                 $this->mDTopen = $inBlockElem = false;
1992                 $prefixLength = 0;
1993                 $paragraphStack = false;
1994
1995                 foreach ( $textLines as $oLine ) {
1996                         # Fix up $linestart
1997                         if ( !$linestart ) {
1998                                 $output .= $oLine;
1999                                 $linestart = true;
2000                                 continue;
2001                         }
2002                         // * = ul
2003                         // # = ol
2004                         // ; = dt
2005                         // : = dd
2006
2007                         $lastPrefixLength = strlen( $lastPrefix );
2008                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2009                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2010                         // If not in a <pre> element, scan for and figure out what prefixes are there.
2011                         if ( !$this->mInPre ) {
2012                                 # Multiple prefixes may abut each other for nested lists.
2013                                 $prefixLength = strspn( $oLine, '*#:;' );
2014                                 $prefix = substr( $oLine, 0, $prefixLength );
2015
2016                                 # eh?
2017                                 // ; and : are both from definition-lists, so they're equivalent
2018                                 //  for the purposes of determining whether or not we need to open/close
2019                                 //  elements.
2020                                 $prefix2 = str_replace( ';', ':', $prefix );
2021                                 $t = substr( $oLine, $prefixLength );
2022                                 $this->mInPre = (bool)$preOpenMatch;
2023                         } else {
2024                                 # Don't interpret any other prefixes in preformatted text
2025                                 $prefixLength = 0;
2026                                 $prefix = $prefix2 = '';
2027                                 $t = $oLine;
2028                         }
2029
2030                         # List generation
2031                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2032                                 # Same as the last item, so no need to deal with nesting or opening stuff
2033                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2034                                 $paragraphStack = false;
2035
2036                                 if ( substr( $prefix, -1 ) === ';') {
2037                                         # The one nasty exception: definition lists work like this:
2038                                         # ; title : definition text
2039                                         # So we check for : in the remainder text to split up the
2040                                         # title and definition, without b0rking links.
2041                                         $term = $t2 = '';
2042                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2043                                                 $t = $t2;
2044                                                 $output .= $term . $this->nextItem( ':' );
2045                                         }
2046                                 }
2047                         } elseif( $prefixLength || $lastPrefixLength ) {
2048                                 // We need to open or close prefixes, or both.
2049
2050                                 # Either open or close a level...
2051                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2052                                 $paragraphStack = false;
2053
2054                                 // Close all the prefixes which aren't shared.
2055                                 while( $commonPrefixLength < $lastPrefixLength ) {
2056                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2057                                         --$lastPrefixLength;
2058                                 }
2059
2060                                 // Continue the current prefix if appropriate.
2061                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2062                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2063                                 }
2064
2065                                 // Open prefixes where appropriate.
2066                                 while ( $prefixLength > $commonPrefixLength ) {
2067                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2068                                         $output .= $this->openList( $char );
2069
2070                                         if ( ';' === $char ) {
2071                                                 # FIXME: This is dupe of code above
2072                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2073                                                         $t = $t2;
2074                                                         $output .= $term . $this->nextItem( ':' );
2075                                                 }
2076                                         }
2077                                         ++$commonPrefixLength;
2078                                 }
2079                                 $lastPrefix = $prefix2;
2080                         }
2081
2082                         // If we have no prefixes, go to paragraph mode.
2083                         if( 0 == $prefixLength ) {
2084                                 wfProfileIn( __METHOD__."-paragraph" );
2085                                 # No prefix (not in list)--go to paragraph mode
2086                                 // XXX: use a stack for nestable elements like span, table and div
2087                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2088                                 $closematch = preg_match(
2089                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2090                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2091                                 if ( $openmatch or $closematch ) {
2092                                         $paragraphStack = false;
2093                                         # TODO bug 5718: paragraph closed
2094                                         $output .= $this->closeParagraph();
2095                                         if ( $preOpenMatch and !$preCloseMatch ) {
2096                                                 $this->mInPre = true;
2097                                         }
2098                                         if ( $closematch ) {
2099                                                 $inBlockElem = false;
2100                                         } else {
2101                                                 $inBlockElem = true;
2102                                         }
2103                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2104                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2105                                                 // pre
2106                                                 if ($this->mLastSection !== 'pre') {
2107                                                         $paragraphStack = false;
2108                                                         $output .= $this->closeParagraph().'<pre>';
2109                                                         $this->mLastSection = 'pre';
2110                                                 }
2111                                                 $t = substr( $t, 1 );
2112                                         } else {
2113                                                 // paragraph
2114                                                 if ( trim($t) == '' ) {
2115                                                         if ( $paragraphStack ) {
2116                                                                 $output .= $paragraphStack.'<br />';
2117                                                                 $paragraphStack = false;
2118                                                                 $this->mLastSection = 'p';
2119                                                         } else {
2120                                                                 if ($this->mLastSection !== 'p' ) {
2121                                                                         $output .= $this->closeParagraph();
2122                                                                         $this->mLastSection = '';
2123                                                                         $paragraphStack = '<p>';
2124                                                                 } else {
2125                                                                         $paragraphStack = '</p><p>';
2126                                                                 }
2127                                                         }
2128                                                 } else {
2129                                                         if ( $paragraphStack ) {
2130                                                                 $output .= $paragraphStack;
2131                                                                 $paragraphStack = false;
2132                                                                 $this->mLastSection = 'p';
2133                                                         } else if ($this->mLastSection !== 'p') {
2134                                                                 $output .= $this->closeParagraph().'<p>';
2135                                                                 $this->mLastSection = 'p';
2136                                                         }
2137                                                 }
2138                                         }
2139                                 }
2140                                 wfProfileOut( __METHOD__."-paragraph" );
2141                         }
2142                         // somewhere above we forget to get out of pre block (bug 785)
2143                         if($preCloseMatch && $this->mInPre) {
2144                                 $this->mInPre = false;
2145                         }
2146                         if ($paragraphStack === false) {
2147                                 $output .= $t."\n";
2148                         }
2149                 }
2150                 while ( $prefixLength ) {
2151                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2152                         --$prefixLength;
2153                 }
2154                 if ( $this->mLastSection != '' ) {
2155                         $output .= '</' . $this->mLastSection . '>';
2156                         $this->mLastSection = '';
2157                 }
2158
2159                 wfProfileOut( __METHOD__ );
2160                 return $output;
2161         }
2162
2163         /**
2164          * Split up a string on ':', ignoring any occurences inside tags
2165          * to prevent illegal overlapping.
2166          * @param string $str the string to split
2167          * @param string &$before set to everything before the ':'
2168          * @param string &$after set to everything after the ':'
2169          * return string the position of the ':', or false if none found
2170          */
2171         function findColonNoLinks($str, &$before, &$after) {
2172                 wfProfileIn( __METHOD__ );
2173
2174                 $pos = strpos( $str, ':' );
2175                 if( $pos === false ) {
2176                         // Nothing to find!
2177                         wfProfileOut( __METHOD__ );
2178                         return false;
2179                 }
2180
2181                 $lt = strpos( $str, '<' );
2182                 if( $lt === false || $lt > $pos ) {
2183                         // Easy; no tag nesting to worry about
2184                         $before = substr( $str, 0, $pos );
2185                         $after = substr( $str, $pos+1 );
2186                         wfProfileOut( __METHOD__ );
2187                         return $pos;
2188                 }
2189
2190                 // Ugly state machine to walk through avoiding tags.
2191                 $state = self::COLON_STATE_TEXT;
2192                 $stack = 0;
2193                 $len = strlen( $str );
2194                 for( $i = 0; $i < $len; $i++ ) {
2195                         $c = $str{$i};
2196
2197                         switch( $state ) {
2198                         // (Using the number is a performance hack for common cases)
2199                         case 0: // self::COLON_STATE_TEXT:
2200                                 switch( $c ) {
2201                                 case "<":
2202                                         // Could be either a <start> tag or an </end> tag
2203                                         $state = self::COLON_STATE_TAGSTART;
2204                                         break;
2205                                 case ":":
2206                                         if( $stack == 0 ) {
2207                                                 // We found it!
2208                                                 $before = substr( $str, 0, $i );
2209                                                 $after = substr( $str, $i + 1 );
2210                                                 wfProfileOut( __METHOD__ );
2211                                                 return $i;
2212                                         }
2213                                         // Embedded in a tag; don't break it.
2214                                         break;
2215                                 default:
2216                                         // Skip ahead looking for something interesting
2217                                         $colon = strpos( $str, ':', $i );
2218                                         if( $colon === false ) {
2219                                                 // Nothing else interesting
2220                                                 wfProfileOut( __METHOD__ );
2221                                                 return false;
2222                                         }
2223                                         $lt = strpos( $str, '<', $i );
2224                                         if( $stack === 0 ) {
2225                                                 if( $lt === false || $colon < $lt ) {
2226                                                         // We found it!
2227                                                         $before = substr( $str, 0, $colon );
2228                                                         $after = substr( $str, $colon + 1 );
2229                                                         wfProfileOut( __METHOD__ );
2230                                                         return $i;
2231                                                 }
2232                                         }
2233                                         if( $lt === false ) {
2234                                                 // Nothing else interesting to find; abort!
2235                                                 // We're nested, but there's no close tags left. Abort!
2236                                                 break 2;
2237                                         }
2238                                         // Skip ahead to next tag start
2239                                         $i = $lt;
2240                                         $state = self::COLON_STATE_TAGSTART;
2241                                 }
2242                                 break;
2243                         case 1: // self::COLON_STATE_TAG:
2244                                 // In a <tag>
2245                                 switch( $c ) {
2246                                 case ">":
2247                                         $stack++;
2248                                         $state = self::COLON_STATE_TEXT;
2249                                         break;
2250                                 case "/":
2251                                         // Slash may be followed by >?
2252                                         $state = self::COLON_STATE_TAGSLASH;
2253                                         break;
2254                                 default:
2255                                         // ignore
2256                                 }
2257                                 break;
2258                         case 2: // self::COLON_STATE_TAGSTART:
2259                                 switch( $c ) {
2260                                 case "/":
2261                                         $state = self::COLON_STATE_CLOSETAG;
2262                                         break;
2263                                 case "!":
2264                                         $state = self::COLON_STATE_COMMENT;
2265                                         break;
2266                                 case ">":
2267                                         // Illegal early close? This shouldn't happen D:
2268                                         $state = self::COLON_STATE_TEXT;
2269                                         break;
2270                                 default:
2271                                         $state = self::COLON_STATE_TAG;
2272                                 }
2273                                 break;
2274                         case 3: // self::COLON_STATE_CLOSETAG:
2275                                 // In a </tag>
2276                                 if( $c === ">" ) {
2277                                         $stack--;
2278                                         if( $stack < 0 ) {
2279                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2280                                                 wfProfileOut( __METHOD__ );
2281                                                 return false;
2282                                         }
2283                                         $state = self::COLON_STATE_TEXT;
2284                                 }
2285                                 break;
2286                         case self::COLON_STATE_TAGSLASH:
2287                                 if( $c === ">" ) {
2288                                         // Yes, a self-closed tag <blah/>
2289                                         $state = self::COLON_STATE_TEXT;
2290                                 } else {
2291                                         // Probably we're jumping the gun, and this is an attribute
2292                                         $state = self::COLON_STATE_TAG;
2293                                 }
2294                                 break;
2295                         case 5: // self::COLON_STATE_COMMENT:
2296                                 if( $c === "-" ) {
2297                                         $state = self::COLON_STATE_COMMENTDASH;
2298                                 }
2299                                 break;
2300                         case self::COLON_STATE_COMMENTDASH:
2301                                 if( $c === "-" ) {
2302                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2303                                 } else {
2304                                         $state = self::COLON_STATE_COMMENT;
2305                                 }
2306                                 break;
2307                         case self::COLON_STATE_COMMENTDASHDASH:
2308                                 if( $c === ">" ) {
2309                                         $state = self::COLON_STATE_TEXT;
2310                                 } else {
2311                                         $state = self::COLON_STATE_COMMENT;
2312                                 }
2313                                 break;
2314                         default:
2315                                 throw new MWException( "State machine error in " . __METHOD__ );
2316                         }
2317                 }
2318                 if( $stack > 0 ) {
2319                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2320                         return false;
2321                 }
2322                 wfProfileOut( __METHOD__ );
2323                 return false;
2324         }
2325
2326         /**
2327          * Return value of a magic variable (like PAGENAME)
2328          *
2329          * @private
2330          */
2331         function getVariableValue( $index, $frame=false ) {
2332                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2333                 global $wgScriptPath, $wgStylePath;
2334
2335                 /**
2336                  * Some of these require message or data lookups and can be
2337                  * expensive to check many times.
2338                  */
2339                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2340                         if ( isset( $this->mVarCache[$index] ) ) {
2341                                 return $this->mVarCache[$index];
2342                         }
2343                 }
2344
2345                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2346                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2347
2348                 # Use the time zone
2349                 global $wgLocaltimezone;
2350                 if ( isset( $wgLocaltimezone ) ) {
2351                         $oldtz = date_default_timezone_get();
2352                         date_default_timezone_set( $wgLocaltimezone );
2353                 }
2354
2355                 $localTimestamp = date( 'YmdHis', $ts );
2356                 $localMonth = date( 'm', $ts );
2357                 $localMonth1 = date( 'n', $ts );
2358                 $localMonthName = date( 'n', $ts );
2359                 $localDay = date( 'j', $ts );
2360                 $localDay2 = date( 'd', $ts );
2361                 $localDayOfWeek = date( 'w', $ts );
2362                 $localWeek = date( 'W', $ts );
2363                 $localYear = date( 'Y', $ts );
2364                 $localHour = date( 'H', $ts );
2365                 if ( isset( $wgLocaltimezone ) ) {
2366                         date_default_timezone_set( $oldtz );
2367                 }
2368
2369                 switch ( $index ) {
2370                         case 'currentmonth':
2371                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2372                                 break;
2373                         case 'currentmonth1':
2374                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2375                                 break;
2376                         case 'currentmonthname':
2377                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2378                                 break;
2379                         case 'currentmonthnamegen':
2380                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2381                                 break;
2382                         case 'currentmonthabbrev':
2383                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2384                                 break;
2385                         case 'currentday':
2386                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2387                                 break;
2388                         case 'currentday2':
2389                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2390                                 break;
2391                         case 'localmonth':
2392                                 $value = $wgContLang->formatNum( $localMonth );
2393                                 break;
2394                         case 'localmonth1':
2395                                 $value = $wgContLang->formatNum( $localMonth1 );
2396                                 break;
2397                         case 'localmonthname':
2398                                 $value = $wgContLang->getMonthName( $localMonthName );
2399                                 break;
2400                         case 'localmonthnamegen':
2401                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2402                                 break;
2403                         case 'localmonthabbrev':
2404                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2405                                 break;
2406                         case 'localday':
2407                                 $value = $wgContLang->formatNum( $localDay );
2408                                 break;
2409                         case 'localday2':
2410                                 $value = $wgContLang->formatNum( $localDay2 );
2411                                 break;
2412                         case 'pagename':
2413                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2414                                 break;
2415                         case 'pagenamee':
2416                                 $value = $this->mTitle->getPartialURL();
2417                                 break;
2418                         case 'fullpagename':
2419                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2420                                 break;
2421                         case 'fullpagenamee':
2422                                 $value = $this->mTitle->getPrefixedURL();
2423                                 break;
2424                         case 'subpagename':
2425                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2426                                 break;
2427                         case 'subpagenamee':
2428                                 $value = $this->mTitle->getSubpageUrlForm();
2429                                 break;
2430                         case 'basepagename':
2431                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2432                                 break;
2433                         case 'basepagenamee':
2434                                 $value = wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2435                                 break;
2436                         case 'talkpagename':
2437                                 if( $this->mTitle->canTalk() ) {
2438                                         $talkPage = $this->mTitle->getTalkPage();
2439                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2440                                 } else {
2441                                         $value = '';
2442                                 }
2443                                 break;
2444                         case 'talkpagenamee':
2445                                 if( $this->mTitle->canTalk() ) {
2446                                         $talkPage = $this->mTitle->getTalkPage();
2447                                         $value = $talkPage->getPrefixedUrl();
2448                                 } else {
2449                                         $value = '';
2450                                 }
2451                                 break;
2452                         case 'subjectpagename':
2453                                 $subjPage = $this->mTitle->getSubjectPage();
2454                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2455                                 break;
2456                         case 'subjectpagenamee':
2457                                 $subjPage = $this->mTitle->getSubjectPage();
2458                                 $value = $subjPage->getPrefixedUrl();
2459                                 break;
2460                         case 'revisionid':
2461                                 // Let the edit saving system know we should parse the page
2462                                 // *after* a revision ID has been assigned.
2463                                 $this->mOutput->setFlag( 'vary-revision' );
2464                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2465                                 $value = $this->mRevisionId;
2466                                 break;
2467                         case 'revisionday':
2468                                 // Let the edit saving system know we should parse the page
2469                                 // *after* a revision ID has been assigned. This is for null edits.
2470                                 $this->mOutput->setFlag( 'vary-revision' );
2471                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2472                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2473                                 break;
2474                         case 'revisionday2':
2475                                 // Let the edit saving system know we should parse the page
2476                                 // *after* a revision ID has been assigned. This is for null edits.
2477                                 $this->mOutput->setFlag( 'vary-revision' );
2478                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2479                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2480                                 break;
2481                         case 'revisionmonth':
2482                                 // Let the edit saving system know we should parse the page
2483                                 // *after* a revision ID has been assigned. This is for null edits.
2484                                 $this->mOutput->setFlag( 'vary-revision' );
2485                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2486                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2487                                 break;
2488                         case 'revisionyear':
2489                                 // Let the edit saving system know we should parse the page
2490                                 // *after* a revision ID has been assigned. This is for null edits.
2491                                 $this->mOutput->setFlag( 'vary-revision' );
2492                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2493                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2494                                 break;
2495                         case 'revisiontimestamp':
2496                                 // Let the edit saving system know we should parse the page
2497                                 // *after* a revision ID has been assigned. This is for null edits.
2498                                 $this->mOutput->setFlag( 'vary-revision' );
2499                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2500                                 $value = $this->getRevisionTimestamp();
2501                                 break;
2502                         case 'revisionuser':
2503                                 // Let the edit saving system know we should parse the page
2504                                 // *after* a revision ID has been assigned. This is for null edits.
2505                                 $this->mOutput->setFlag( 'vary-revision' );
2506                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2507                                 $value = $this->getRevisionUser();
2508                                 break;
2509                         case 'namespace':
2510                                 $value = str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2511                                 break;
2512                         case 'namespacee':
2513                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2514                                 break;
2515                         case 'talkspace':
2516                                 $value = $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2517                                 break;
2518                         case 'talkspacee':
2519                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2520                                 break;
2521                         case 'subjectspace':
2522                                 $value = $this->mTitle->getSubjectNsText();
2523                                 break;
2524                         case 'subjectspacee':
2525                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2526                                 break;
2527                         case 'currentdayname':
2528                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2529                                 break;
2530                         case 'currentyear':
2531                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2532                                 break;
2533                         case 'currenttime':
2534                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2535                                 break;
2536                         case 'currenthour':
2537                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2538                                 break;
2539                         case 'currentweek':
2540                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2541                                 // int to remove the padding
2542                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2543                                 break;
2544                         case 'currentdow':
2545                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2546                                 break;
2547                         case 'localdayname':
2548                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2549                                 break;
2550                         case 'localyear':
2551                                 $value = $wgContLang->formatNum( $localYear, true );
2552                                 break;
2553                         case 'localtime':
2554                                 $value = $wgContLang->time( $localTimestamp, false, false );
2555                                 break;
2556                         case 'localhour':
2557                                 $value = $wgContLang->formatNum( $localHour, true );
2558                                 break;
2559                         case 'localweek':
2560                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2561                                 // int to remove the padding
2562                                 $value = $wgContLang->formatNum( (int)$localWeek );
2563                                 break;
2564                         case 'localdow':
2565                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2566                                 break;
2567                         case 'numberofarticles':
2568                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2569                                 break;
2570                         case 'numberoffiles':
2571                                 $value = $wgContLang->formatNum( SiteStats::images() );
2572                                 break;
2573                         case 'numberofusers':
2574                                 $value = $wgContLang->formatNum( SiteStats::users() );
2575                                 break;
2576                         case 'numberofactiveusers':
2577                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2578                                 break;
2579                         case 'numberofpages':
2580                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2581                                 break;
2582                         case 'numberofadmins':
2583                                 $value = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2584                                 break;
2585                         case 'numberofedits':
2586                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2587                                 break;
2588                         case 'numberofviews':
2589                                 $value = $wgContLang->formatNum( SiteStats::views() );
2590                                 break;
2591                         case 'currenttimestamp':
2592                                 $value = wfTimestamp( TS_MW, $ts );
2593                                 break;
2594                         case 'localtimestamp':
2595                                 $value = $localTimestamp;
2596                                 break;
2597                         case 'currentversion':
2598                                 $value = SpecialVersion::getVersion();
2599                                 break;
2600                         case 'sitename':
2601                                 return $wgSitename;
2602                         case 'server':
2603                                 return $wgServer;
2604                         case 'servername':
2605                                 return $wgServerName;
2606                         case 'scriptpath':
2607                                 return $wgScriptPath;
2608                         case 'stylepath':
2609                                 return $wgStylePath;
2610                         case 'directionmark':
2611                                 return $wgContLang->getDirMark();
2612                         case 'contentlanguage':
2613                                 global $wgContLanguageCode;
2614                                 return $wgContLanguageCode;
2615                         default:
2616                                 $ret = null;
2617                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) )
2618                                         return $ret;
2619                                 else
2620                                         return null;
2621                 }
2622
2623                 if ( $index )
2624                         $this->mVarCache[$index] = $value;
2625
2626                 return $value;
2627         }
2628
2629         /**
2630          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2631          *
2632          * @private
2633          */
2634         function initialiseVariables() {
2635                 wfProfileIn( __METHOD__ );
2636                 $variableIDs = MagicWord::getVariableIDs();
2637                 $substIDs = MagicWord::getSubstIDs();
2638
2639                 $this->mVariables = new MagicWordArray( $variableIDs );
2640                 $this->mSubsts = new MagicWordArray( $substIDs );
2641                 wfProfileOut( __METHOD__ );
2642         }
2643
2644         /**
2645          * Preprocess some wikitext and return the document tree.
2646          * This is the ghost of replace_variables().
2647          *
2648          * @param string $text The text to parse
2649          * @param integer flags Bitwise combination of:
2650          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2651          *                                     included. Default is to assume a direct page view.
2652          *
2653          * The generated DOM tree must depend only on the input text and the flags.
2654          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2655          *
2656          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2657          * change in the DOM tree for a given text, must be passed through the section identifier
2658          * in the section edit link and thus back to extractSections().
2659          *
2660          * The output of this function is currently only cached in process memory, but a persistent
2661          * cache may be implemented at a later date which takes further advantage of these strict
2662          * dependency requirements.
2663          *
2664          * @private
2665          */
2666         function preprocessToDom ( $text, $flags = 0 ) {
2667                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2668                 return $dom;
2669         }
2670
2671         /*
2672          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2673          */
2674         public static function splitWhitespace( $s ) {
2675                 $ltrimmed = ltrim( $s );
2676                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2677                 $trimmed = rtrim( $ltrimmed );
2678                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2679                 if ( $diff > 0 ) {
2680                         $w2 = substr( $ltrimmed, -$diff );
2681                 } else {
2682                         $w2 = '';
2683                 }
2684                 return array( $w1, $trimmed, $w2 );
2685         }
2686
2687         /**
2688          * Replace magic variables, templates, and template arguments
2689          * with the appropriate text. Templates are substituted recursively,
2690          * taking care to avoid infinite loops.
2691          *
2692          * Note that the substitution depends on value of $mOutputType:
2693          *  self::OT_WIKI: only {{subst:}} templates
2694          *  self::OT_PREPROCESS: templates but not extension tags
2695          *  self::OT_HTML: all templates and extension tags
2696          *
2697          * @param string $tex The text to transform
2698          * @param PPFrame $frame Object describing the arguments passed to the template.
2699          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2700          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2701          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2702          * @private
2703          */
2704         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2705                 # Is there any text? Also, Prevent too big inclusions!
2706                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2707                         return $text;
2708                 }
2709                 wfProfileIn( __METHOD__ );
2710
2711                 if ( $frame === false ) {
2712                         $frame = $this->getPreprocessor()->newFrame();
2713                 } elseif ( !( $frame instanceof PPFrame ) ) {
2714                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2715                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2716                 }
2717
2718                 $dom = $this->preprocessToDom( $text );
2719                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2720                 $text = $frame->expand( $dom, $flags );
2721
2722                 wfProfileOut( __METHOD__ );
2723                 return $text;
2724         }
2725
2726         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2727         static function createAssocArgs( $args ) {
2728                 $assocArgs = array();
2729                 $index = 1;
2730                 foreach( $args as $arg ) {
2731                         $eqpos = strpos( $arg, '=' );
2732                         if ( $eqpos === false ) {
2733                                 $assocArgs[$index++] = $arg;
2734                         } else {
2735                                 $name = trim( substr( $arg, 0, $eqpos ) );
2736                                 $value = trim( substr( $arg, $eqpos+1 ) );
2737                                 if ( $value === false ) {
2738                                         $value = '';
2739                                 }
2740                                 if ( $name !== false ) {
2741                                         $assocArgs[$name] = $value;
2742                                 }
2743                         }
2744                 }
2745
2746                 return $assocArgs;
2747         }
2748
2749         /**
2750          * Warn the user when a parser limitation is reached
2751          * Will warn at most once the user per limitation type
2752          *
2753          * @param string $limitationType, should be one of:
2754          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2755          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2756          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2757          * @params int $current, $max When an explicit limit has been
2758          *       exceeded, provide the values (optional)
2759          */
2760         function limitationWarn( $limitationType, $current=null, $max=null) {
2761                 //does no harm if $current and $max are present but are unnecessary for the message
2762                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2763                 $this->mOutput->addWarning( $warning );
2764                 $this->addTrackingCategory( "$limitationType-category" );
2765         }
2766
2767         /**
2768          * Return the text of a template, after recursively
2769          * replacing any variables or templates within the template.
2770          *
2771          * @param array $piece The parts of the template
2772          *  $piece['title']: the title, i.e. the part before the |
2773          *  $piece['parts']: the parameter array
2774          *  $piece['lineStart']: whether the brace was at the start of a line
2775          * @param PPFrame The current frame, contains template arguments
2776          * @return string the text of the template
2777          * @private
2778          */
2779         function braceSubstitution( $piece, $frame ) {
2780                 global $wgContLang, $wgNonincludableNamespaces;
2781                 wfProfileIn( __METHOD__ );
2782                 wfProfileIn( __METHOD__.'-setup' );
2783
2784                 # Flags
2785                 $found = false;             # $text has been filled
2786                 $nowiki = false;            # wiki markup in $text should be escaped
2787                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2788                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2789                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2790                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2791
2792                 # Title object, where $text came from
2793                 $title = null;
2794
2795                 # $part1 is the bit before the first |, and must contain only title characters.
2796                 # Various prefixes will be stripped from it later.
2797                 $titleWithSpaces = $frame->expand( $piece['title'] );
2798                 $part1 = trim( $titleWithSpaces );
2799                 $titleText = false;
2800
2801                 # Original title text preserved for various purposes
2802                 $originalTitle = $part1;
2803
2804                 # $args is a list of argument nodes, starting from index 0, not including $part1
2805                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2806                 wfProfileOut( __METHOD__.'-setup' );
2807
2808                 # SUBST
2809                 wfProfileIn( __METHOD__.'-modifiers' );
2810                 if ( !$found ) {
2811
2812                         $substMatch = $this->mSubsts->matchStartAndRemove( $part1 );
2813
2814                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
2815                         # Whether to include depends also on whether we are in the pre-save-transform
2816                         #
2817                         # safesubst || (subst && PST) || (false && !PST) => transclude (skip the if)
2818                         # (false && PST) || (subst && !PST)  => return input (handled by if)
2819                         if ( $substMatch != 'safesubst' && ($substMatch == 'subst' xor $this->ot['wiki']) ) {
2820                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2821                                 $isLocalObj = true;
2822                                 $found = true;
2823                         }
2824                 }
2825
2826                 # Variables
2827                 if ( !$found && $args->getLength() == 0 ) {
2828                         $id = $this->mVariables->matchStartToEnd( $part1 );
2829                         if ( $id !== false ) {
2830                                 $text = $this->getVariableValue( $id, $frame );
2831                                 if (MagicWord::getCacheTTL($id)>-1)
2832                                         $this->mOutput->mContainsOldMagic = true;
2833                                 $found = true;
2834                         }
2835                 }
2836
2837                 # MSG, MSGNW and RAW
2838                 if ( !$found ) {
2839                         # Check for MSGNW:
2840                         $mwMsgnw = MagicWord::get( 'msgnw' );
2841                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2842                                 $nowiki = true;
2843                         } else {
2844                                 # Remove obsolete MSG:
2845                                 $mwMsg = MagicWord::get( 'msg' );
2846                                 $mwMsg->matchStartAndRemove( $part1 );
2847                         }
2848
2849                         # Check for RAW:
2850                         $mwRaw = MagicWord::get( 'raw' );
2851                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2852                                 $forceRawInterwiki = true;
2853                         }
2854                 }
2855                 wfProfileOut( __METHOD__.'-modifiers' );
2856
2857                 # Parser functions
2858                 if ( !$found ) {
2859                         wfProfileIn( __METHOD__ . '-pfunc' );
2860
2861                         $colonPos = strpos( $part1, ':' );
2862                         if ( $colonPos !== false ) {
2863                                 # Case sensitive functions
2864                                 $function = substr( $part1, 0, $colonPos );
2865                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2866                                         $function = $this->mFunctionSynonyms[1][$function];
2867                                 } else {
2868                                         # Case insensitive functions
2869                                         $function = $wgContLang->lc( $function );
2870                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2871                                                 $function = $this->mFunctionSynonyms[0][$function];
2872                                         } else {
2873                                                 $function = false;
2874                                         }
2875                                 }
2876                                 if ( $function ) {
2877                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2878                                         $initialArgs = array( &$this );
2879                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2880                                         if ( $flags & SFH_OBJECT_ARGS ) {
2881                                                 # Add a frame parameter, and pass the arguments as an array
2882                                                 $allArgs = $initialArgs;
2883                                                 $allArgs[] = $frame;
2884                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2885                                                         $funcArgs[] = $args->item( $i );
2886                                                 }
2887                                                 $allArgs[] = $funcArgs;
2888                                         } else {
2889                                                 # Convert arguments to plain text
2890                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2891                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2892                                                 }
2893                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2894                                         }
2895
2896                                         # Workaround for PHP bug 35229 and similar
2897                                         if ( !is_callable( $callback ) ) {
2898                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2899                                                 wfProfileOut( __METHOD__ );
2900                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2901                                         }
2902                                         $result = call_user_func_array( $callback, $allArgs );
2903                                         $found = true;
2904                                         $noparse = true;
2905                                         $preprocessFlags = 0;
2906
2907                                         if ( is_array( $result ) ) {
2908                                                 if ( isset( $result[0] ) ) {
2909                                                         $text = $result[0];
2910                                                         unset( $result[0] );
2911                                                 }
2912
2913                                                 // Extract flags into the local scope
2914                                                 // This allows callers to set flags such as nowiki, found, etc.
2915                                                 extract( $result );
2916                                         } else {
2917                                                 $text = $result;
2918                                         }
2919                                         if ( !$noparse ) {
2920                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2921                                                 $isChildObj = true;
2922                                         }
2923                                 }
2924                         }
2925                         wfProfileOut( __METHOD__ . '-pfunc' );
2926                 }
2927
2928                 # Finish mangling title and then check for loops.
2929                 # Set $title to a Title object and $titleText to the PDBK
2930                 if ( !$found ) {
2931                         $ns = NS_TEMPLATE;
2932                         # Split the title into page and subpage
2933                         $subpage = '';
2934                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2935                         if ($subpage !== '') {
2936                                 $ns = $this->mTitle->getNamespace();
2937                         }
2938                         $title = Title::newFromText( $part1, $ns );
2939                         if ( $title ) {
2940                                 $titleText = $title->getPrefixedText();
2941                                 # Check for language variants if the template is not found
2942                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2943                                         $wgContLang->findVariantLink( $part1, $title, true );
2944                                 }
2945                                 # Do recursion depth check
2946                                 $limit = $this->mOptions->getMaxTemplateDepth();
2947                                 if ( $frame->depth >= $limit ) {
2948                                         $found = true;
2949                                         $text = '<span class="error">' . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit ) . '</span>';
2950                                 }
2951                         }
2952                 }
2953
2954                 # Load from database
2955                 if ( !$found && $title ) {
2956                         wfProfileIn( __METHOD__ . '-loadtpl' );
2957                         if ( !$title->isExternal() ) {
2958                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2959                                         $text = SpecialPage::capturePath( $title );
2960                                         if ( is_string( $text ) ) {
2961                                                 $found = true;
2962                                                 $isHTML = true;
2963                                                 $this->disableCache();
2964                                         }
2965                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2966                                         $found = false; //access denied
2967                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2968                                 } else {
2969                                         list( $text, $title ) = $this->getTemplateDom( $title );
2970                                         if ( $text !== false ) {
2971                                                 $found = true;
2972                                                 $isChildObj = true;
2973                                         }
2974                                 }
2975
2976                                 # If the title is valid but undisplayable, make a link to it
2977                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2978                                         $text = "[[:$titleText]]";
2979                                         $found = true;
2980                                 }
2981                         } elseif ( $title->isTrans() ) {
2982                                 // Interwiki transclusion
2983                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2984                                         $text = $this->interwikiTransclude( $title, 'render' );
2985                                         $isHTML = true;
2986                                 } else {
2987                                         $text = $this->interwikiTransclude( $title, 'raw' );
2988                                         // Preprocess it like a template
2989                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2990                                         $isChildObj = true;
2991                                 }
2992                                 $found = true;
2993                         }
2994
2995                         # Do infinite loop check
2996                         # This has to be done after redirect resolution to avoid infinite loops via redirects
2997                         if ( !$frame->loopCheck( $title ) ) {
2998                                 $found = true;
2999                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
3000                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
3001                         }
3002                         wfProfileOut( __METHOD__ . '-loadtpl' );
3003                 }
3004
3005                 # If we haven't found text to substitute by now, we're done
3006                 # Recover the source wikitext and return it
3007                 if ( !$found ) {
3008                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3009                         wfProfileOut( __METHOD__ );
3010                         return array( 'object' => $text );
3011                 }
3012
3013                 # Expand DOM-style return values in a child frame
3014                 if ( $isChildObj ) {
3015                         # Clean up argument array
3016                         $newFrame = $frame->newChild( $args, $title );
3017
3018                         if ( $nowiki ) {
3019                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3020                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3021                                 # Expansion is eligible for the empty-frame cache
3022                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3023                                         $text = $this->mTplExpandCache[$titleText];
3024                                 } else {
3025                                         $text = $newFrame->expand( $text );
3026                                         $this->mTplExpandCache[$titleText] = $text;
3027                                 }
3028                         } else {
3029                                 # Uncached expansion
3030                                 $text = $newFrame->expand( $text );
3031                         }
3032                 }
3033                 if ( $isLocalObj && $nowiki ) {
3034                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3035                         $isLocalObj = false;
3036                 }
3037
3038                 # Replace raw HTML by a placeholder
3039                 # Add a blank line preceding, to prevent it from mucking up
3040                 # immediately preceding headings
3041                 if ( $isHTML ) {
3042                         $text = "\n\n" . $this->insertStripItem( $text );
3043                 }
3044                 # Escape nowiki-style return values
3045                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3046                         $text = wfEscapeWikiText( $text );
3047                 }
3048                 # Bug 529: if the template begins with a table or block-level
3049                 # element, it should be treated as beginning a new line.
3050                 # This behaviour is somewhat controversial.
3051                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3052                         $text = "\n" . $text;
3053                 }
3054
3055                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3056                         # Error, oversize inclusion
3057                         $text = "[[$originalTitle]]" .
3058                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3059                         $this->limitationWarn( 'post-expand-template-inclusion' );
3060                 }
3061
3062                 if ( $isLocalObj ) {
3063                         $ret = array( 'object' => $text );
3064                 } else {
3065                         $ret = array( 'text' => $text );
3066                 }
3067
3068                 wfProfileOut( __METHOD__ );
3069                 return $ret;
3070         }
3071
3072         /**
3073          * Get the semi-parsed DOM representation of a template with a given title,
3074          * and its redirect destination title. Cached.
3075          */
3076         function getTemplateDom( $title ) {
3077                 $cacheTitle = $title;
3078                 $titleText = $title->getPrefixedDBkey();
3079
3080                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3081                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3082                         $title = Title::makeTitle( $ns, $dbk );
3083                         $titleText = $title->getPrefixedDBkey();
3084                 }
3085                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3086                         return array( $this->mTplDomCache[$titleText], $title );
3087                 }
3088
3089                 // Cache miss, go to the database
3090                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3091
3092                 if ( $text === false ) {
3093                         $this->mTplDomCache[$titleText] = false;
3094                         return array( false, $title );
3095                 }
3096
3097                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3098                 $this->mTplDomCache[ $titleText ] = $dom;
3099
3100                 if (! $title->equals($cacheTitle)) {
3101                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3102                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3103                 }
3104
3105                 return array( $dom, $title );
3106         }
3107
3108         /**
3109          * Fetch the unparsed text of a template and register a reference to it.
3110          */
3111         function fetchTemplateAndTitle( $title ) {
3112                 $templateCb = $this->mOptions->getTemplateCallback();
3113                 $stuff = call_user_func( $templateCb, $title, $this );
3114                 $text = $stuff['text'];
3115                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3116                 if ( isset( $stuff['deps'] ) ) {
3117                         foreach ( $stuff['deps'] as $dep ) {
3118                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3119                         }
3120                 }
3121                 return array($text,$finalTitle);
3122         }
3123
3124         function fetchTemplate( $title ) {
3125                 $rv = $this->fetchTemplateAndTitle($title);
3126                 return $rv[0];
3127         }
3128
3129         /**
3130          * Static function to get a template
3131          * Can be overridden via ParserOptions::setTemplateCallback().
3132          */
3133         static function statelessFetchTemplate( $title, $parser=false ) {
3134                 $text = $skip = false;
3135                 $finalTitle = $title;
3136                 $deps = array();
3137
3138                 // Loop to fetch the article, with up to 1 redirect
3139                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3140                         # Give extensions a chance to select the revision instead
3141                         $id = false; // Assume current
3142                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3143
3144                         if( $skip ) {
3145                                 $text = false;
3146                                 $deps[] = array(
3147                                         'title' => $title,
3148                                         'page_id' => $title->getArticleID(),
3149                                         'rev_id' => null );
3150                                 break;
3151                         }
3152                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3153                         $rev_id = $rev ? $rev->getId() : 0;
3154                         // If there is no current revision, there is no page
3155                         if( $id === false && !$rev ) {
3156                                 $linkCache = LinkCache::singleton();
3157                                 $linkCache->addBadLinkObj( $title );
3158                         }
3159
3160                         $deps[] = array(
3161                                 'title' => $title,
3162                                 'page_id' => $title->getArticleID(),
3163                                 'rev_id' => $rev_id );
3164
3165                         if( $rev ) {
3166                                 $text = $rev->getText();
3167                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3168                                 global $wgContLang;
3169                                 $message = $wgContLang->lcfirst( $title->getText() );
3170                                 $text = wfMsgForContentNoTrans( $message );
3171                                 if( wfEmptyMsg( $message, $text ) ) {
3172                                         $text = false;
3173                                         break;
3174                                 }
3175                         } else {
3176                                 break;
3177                         }
3178                         if ( $text === false ) {
3179                                 break;
3180                         }
3181                         // Redirect?
3182                         $finalTitle = $title;
3183                         $title = Title::newFromRedirect( $text );
3184                 }
3185                 return array(
3186                         'text' => $text,
3187                         'finalTitle' => $finalTitle,
3188                         'deps' => $deps );
3189         }
3190
3191         /**
3192          * Transclude an interwiki link.
3193          */
3194         function interwikiTransclude( $title, $action ) {
3195                 global $wgEnableScaryTranscluding;
3196
3197                 if (!$wgEnableScaryTranscluding)
3198                         return wfMsg('scarytranscludedisabled');
3199
3200                 $url = $title->getFullUrl( "action=$action" );
3201
3202                 if (strlen($url) > 255)
3203                         return wfMsg('scarytranscludetoolong');
3204                 return $this->fetchScaryTemplateMaybeFromCache($url);
3205         }
3206
3207         function fetchScaryTemplateMaybeFromCache($url) {
3208                 global $wgTranscludeCacheExpiry;
3209                 $dbr = wfGetDB(DB_SLAVE);
3210                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3211                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3212                                 array('tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3213                 if ($obj) {
3214                         return $obj->tc_contents;
3215                 }
3216
3217                 $text = Http::get($url);
3218                 if (!$text)
3219                         return wfMsg('scarytranscludefailed', $url);
3220
3221                 $dbw = wfGetDB(DB_MASTER);
3222                 $dbw->replace('transcache', array('tc_url'), array(
3223                         'tc_url' => $url,
3224                         'tc_time' => $dbw->timestamp( time() ),
3225                         'tc_contents' => $text));
3226                 return $text;
3227         }
3228
3229
3230         /**
3231          * Triple brace replacement -- used for template arguments
3232          * @private
3233          */
3234         function argSubstitution( $piece, $frame ) {
3235                 wfProfileIn( __METHOD__ );
3236
3237                 $error = false;
3238                 $parts = $piece['parts'];
3239                 $nameWithSpaces = $frame->expand( $piece['title'] );
3240                 $argName = trim( $nameWithSpaces );
3241                 $object = false;
3242                 $text = $frame->getArgument( $argName );
3243                 if (  $text === false && $parts->getLength() > 0
3244                   && (
3245                     $this->ot['html']
3246                     || $this->ot['pre']
3247                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3248                   )
3249                 ) {
3250                         # No match in frame, use the supplied default
3251                         $object = $parts->item( 0 )->getChildren();
3252                 }
3253                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3254                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3255                         $this->limitationWarn( 'post-expand-template-argument' );
3256                 }
3257
3258                 if ( $text === false && $object === false ) {
3259                         # No match anywhere
3260                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3261                 }
3262                 if ( $error !== false ) {
3263                         $text .= $error;
3264                 }
3265                 if ( $object !== false ) {
3266                         $ret = array( 'object' => $object );
3267                 } else {
3268                         $ret = array( 'text' => $text );
3269                 }
3270
3271                 wfProfileOut( __METHOD__ );
3272                 return $ret;
3273         }
3274
3275         /**
3276          * Return the text to be used for a given extension tag.
3277          * This is the ghost of strip().
3278          *
3279          * @param array $params Associative array of parameters:
3280          *     name       PPNode for the tag name
3281          *     attr       PPNode for unparsed text where tag attributes are thought to be
3282          *     attributes Optional associative array of parsed attributes
3283          *     inner      Contents of extension element
3284          *     noClose    Original text did not have a close tag
3285          * @param PPFrame $frame
3286          */
3287         function extensionSubstitution( $params, $frame ) {
3288                 global $wgRawHtml, $wgContLang;
3289
3290                 $name = $frame->expand( $params['name'] );
3291                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3292                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3293                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3294
3295                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3296                         ( $this->ot['html'] || $this->ot['pre'] );
3297                 if ( $isFunctionTag ) {
3298                         $markerType = 'none';
3299                 } else {
3300                         $markerType = 'general';
3301                 }
3302                 if ( $this->ot['html'] || $isFunctionTag ) {
3303                         $name = strtolower( $name );
3304                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3305                         if ( isset( $params['attributes'] ) ) {
3306                                 $attributes = $attributes + $params['attributes'];
3307                         }
3308
3309                         if( isset( $this->mTagHooks[$name] ) ) {
3310                                 # Workaround for PHP bug 35229 and similar
3311                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3312                                         throw new MWException( "Tag hook for $name is not callable\n" );
3313                                 }
3314                                 $output = call_user_func_array( $this->mTagHooks[$name],
3315                                         array( $content, $attributes, $this, $frame ) );
3316                         } elseif( isset( $this->mFunctionTagHooks[$name] ) ) {
3317                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3318                                 if( !is_callable( $callback ) )
3319                                         throw new MWException( "Tag hook for $name is not callable\n" );
3320
3321                                 $output = call_user_func_array( $callback,
3322                                         array( &$this, $frame, $content, $attributes ) );
3323                         } else {
3324                                 $output = '<span class="error">Invalid tag extension name: ' .
3325                                         htmlspecialchars( $name ) . '</span>';
3326                         }
3327
3328                         if ( is_array( $output ) ) {
3329                                 // Extract flags to local scope (to override $markerType)
3330                                 $flags = $output;
3331                                 $output = $flags[0];
3332                                 unset( $flags[0] );
3333                                 extract( $flags );
3334                         }
3335                 } else {
3336                         if ( is_null( $attrText ) ) {
3337                                 $attrText = '';
3338                         }
3339                         if ( isset( $params['attributes'] ) ) {
3340                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3341                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3342                                                 htmlspecialchars( $attrValue ) . '"';
3343                                 }
3344                         }
3345                         if ( $content === null ) {
3346                                 $output = "<$name$attrText/>";
3347                         } else {
3348                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3349                                 $output = "<$name$attrText>$content$close";
3350                         }
3351                 }
3352
3353                 if( $markerType === 'none' ) {
3354                         return $output;
3355                 } elseif ( $markerType === 'nowiki' ) {
3356                         $this->mStripState->nowiki->setPair( $marker, $output );
3357                 } elseif ( $markerType === 'general' ) {
3358                         $this->mStripState->general->setPair( $marker, $output );
3359                 } else {
3360                         throw new MWException( __METHOD__.': invalid marker type' );
3361                 }
3362                 return $marker;
3363         }
3364
3365         /**
3366          * Increment an include size counter
3367          *
3368          * @param string $type The type of expansion
3369          * @param integer $size The size of the text
3370          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3371          */
3372         function incrementIncludeSize( $type, $size ) {
3373                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3374                         return false;
3375                 } else {
3376                         $this->mIncludeSizes[$type] += $size;
3377                         return true;
3378                 }
3379         }
3380
3381         /**
3382          * Increment the expensive function count
3383          *
3384          * @return boolean False if the limit has been exceeded
3385          */
3386         function incrementExpensiveFunctionCount() {
3387                 global $wgExpensiveParserFunctionLimit;
3388                 $this->mExpensiveFunctionCount++;
3389                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3390                         return true;
3391                 }
3392                 return false;
3393         }
3394
3395         /**
3396          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3397          * Fills $this->mDoubleUnderscores, returns the modified text
3398          */
3399         function doDoubleUnderscore( $text ) {
3400                 wfProfileIn( __METHOD__ );
3401
3402                 // The position of __TOC__ needs to be recorded
3403                 $mw = MagicWord::get( 'toc' );
3404                 if( $mw->match( $text ) ) {
3405                         $this->mShowToc = true;
3406                         $this->mForceTocPosition = true;
3407
3408                         // Set a placeholder. At the end we'll fill it in with the TOC.
3409                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3410
3411                         // Only keep the first one.
3412                         $text = $mw->replace( '', $text );
3413                 }
3414
3415                 // Now match and remove the rest of them
3416                 $mwa = MagicWord::getDoubleUnderscoreArray();
3417                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3418
3419                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3420                         $this->mOutput->mNoGallery = true;
3421                 }
3422                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3423                         $this->mShowToc = false;
3424                 }
3425                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3426                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3427                         $this->addTrackingCategory( 'hidden-category-category' );
3428                 }
3429                 # (bug 8068) Allow control over whether robots index a page.
3430                 #
3431                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3432                 # is not desirable, the last one on the page should win.
3433                 if( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3434                         $this->mOutput->setIndexPolicy( 'noindex' );
3435                         $this->addTrackingCategory( 'noindex-category' );
3436                 }
3437                 if( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ){
3438                         $this->mOutput->setIndexPolicy( 'index' );
3439                         $this->addTrackingCategory( 'index-category' );
3440                 }
3441
3442                 wfProfileOut( __METHOD__ );
3443                 return $text;
3444         }
3445
3446         /**
3447          * Add a tracking category, getting the title from a system message,
3448          * or print a debug message if the title is invalid.
3449          * @param $msg String message key
3450          * @return Bool whether the addition was successful
3451          */
3452         protected function addTrackingCategory( $msg ){
3453                 $cat = wfMsgForContent( $msg );
3454
3455                 # Allow tracking categories to be disabled by setting them to "-"
3456                 if( $cat === '-' ) return false;
3457
3458                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3459                 if ( $containerCategory ) {
3460                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3461                         return true;
3462                 } else {
3463                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3464                         return false;
3465                 }
3466         }
3467
3468         /**
3469          * This function accomplishes several tasks:
3470          * 1) Auto-number headings if that option is enabled
3471          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3472          * 3) Add a Table of contents on the top for users who have enabled the option
3473          * 4) Auto-anchor headings
3474          *
3475          * It loops through all headlines, collects the necessary data, then splits up the
3476          * string and re-inserts the newly formatted headlines.
3477          *
3478          * @param string $text
3479          * @param string $origText Original, untouched wikitext
3480          * @param boolean $isMain
3481          * @private
3482          */
3483         function formatHeadings( $text, $origText, $isMain=true ) {
3484                 global $wgMaxTocLevel, $wgContLang, $wgHtml5, $wgExperimentalHtmlIds;
3485
3486                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3487                 $showEditLink = $this->mOptions->getEditSection();
3488
3489                 // Do not call quickUserCan unless necessary
3490                 if( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3491                         $showEditLink = 0;
3492                 }
3493
3494                 # Inhibit editsection links if requested in the page
3495                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3496                         $showEditLink = 0;
3497                 }
3498
3499                 # Get all headlines for numbering them and adding funky stuff like [edit]
3500                 # links - this is for later, but we need the number of headlines right now
3501                 $matches = array();
3502                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3503
3504                 # if there are fewer than 4 headlines in the article, do not show TOC
3505                 # unless it's been explicitly enabled.
3506                 $enoughToc = $this->mShowToc &&
3507                         (($numMatches >= 4) || $this->mForceTocPosition);
3508
3509                 # Allow user to stipulate that a page should have a "new section"
3510                 # link added via __NEWSECTIONLINK__
3511                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3512                         $this->mOutput->setNewSection( true );
3513                 }
3514
3515                 # Allow user to remove the "new section"
3516                 # link via __NONEWSECTIONLINK__
3517                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3518                         $this->mOutput->hideNewSection( true );
3519                 }
3520
3521                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3522                 # override above conditions and always show TOC above first header
3523                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3524                         $this->mShowToc = true;
3525                         $enoughToc = true;
3526                 }
3527
3528                 # We need this to perform operations on the HTML
3529                 $sk = $this->mOptions->getSkin();
3530
3531                 # headline counter
3532                 $headlineCount = 0;
3533                 $numVisible = 0;
3534
3535                 # Ugh .. the TOC should have neat indentation levels which can be
3536                 # passed to the skin functions. These are determined here
3537                 $toc = '';
3538                 $full = '';
3539                 $head = array();
3540                 $sublevelCount = array();
3541                 $levelCount = array();
3542                 $toclevel = 0;
3543                 $level = 0;
3544                 $prevlevel = 0;
3545                 $toclevel = 0;
3546                 $prevtoclevel = 0;
3547                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3548                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3549                 $oldType = $this->mOutputType;
3550                 $this->setOutputType( self::OT_WIKI );
3551                 $frame = $this->getPreprocessor()->newFrame();
3552                 $root = $this->preprocessToDom( $origText );
3553                 $node = $root->getFirstChild();
3554                 $byteOffset = 0;
3555                 $tocraw = array();
3556
3557                 foreach( $matches[3] as $headline ) {
3558                         $isTemplate = false;
3559                         $titleText = false;
3560                         $sectionIndex = false;
3561                         $numbering = '';
3562                         $markerMatches = array();
3563                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3564                                 $serial = $markerMatches[1];
3565                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3566                                 $isTemplate = ($titleText != $baseTitleText);
3567                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3568                         }
3569
3570                         if( $toclevel ) {
3571                                 $prevlevel = $level;
3572                                 $prevtoclevel = $toclevel;
3573                         }
3574                         $level = $matches[1][$headlineCount];
3575
3576                         if ( $level > $prevlevel ) {
3577                                 # Increase TOC level
3578                                 $toclevel++;
3579                                 $sublevelCount[$toclevel] = 0;
3580                                 if( $toclevel<$wgMaxTocLevel ) {
3581                                         $prevtoclevel = $toclevel;
3582                                         $toc .= $sk->tocIndent();
3583                                         $numVisible++;
3584                                 }
3585                         }
3586                         elseif ( $level < $prevlevel && $toclevel > 1 ) {
3587                                 # Decrease TOC level, find level to jump to
3588
3589                                 for ($i = $toclevel; $i > 0; $i--) {
3590                                         if ( $levelCount[$i] == $level ) {
3591                                                 # Found last matching level
3592                                                 $toclevel = $i;
3593                                                 break;
3594                                         }
3595                                         elseif ( $levelCount[$i] < $level ) {
3596                                                 # Found first matching level below current level
3597                                                 $toclevel = $i + 1;
3598                                                 break;
3599                                         }
3600                                 }
3601                                 if( $i == 0 ) $toclevel = 1;
3602                                 if( $toclevel<$wgMaxTocLevel ) {
3603                                         if($prevtoclevel < $wgMaxTocLevel) {
3604                                                 # Unindent only if the previous toc level was shown :p
3605                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3606                                                 $prevtoclevel = $toclevel;
3607                                         } else {
3608                                                 $toc .= $sk->tocLineEnd();
3609                                         }
3610                                 }
3611                         }
3612                         else {
3613                                 # No change in level, end TOC line
3614                                 if( $toclevel<$wgMaxTocLevel ) {
3615                                         $toc .= $sk->tocLineEnd();
3616                                 }
3617                         }
3618
3619                         $levelCount[$toclevel] = $level;
3620
3621                         # count number of headlines for each level
3622                         @$sublevelCount[$toclevel]++;
3623                         $dot = 0;
3624                         for( $i = 1; $i <= $toclevel; $i++ ) {
3625                                 if( !empty( $sublevelCount[$i] ) ) {
3626                                         if( $dot ) {
3627                                                 $numbering .= '.';
3628                                         }
3629                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3630                                         $dot = 1;
3631                                 }
3632                         }
3633
3634                         # The safe header is a version of the header text safe to use for links
3635                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3636                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3637
3638                         # Remove link placeholders by the link text.
3639                         #     <!--LINK number-->
3640                         # turns into
3641                         #     link text with suffix
3642                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3643
3644                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3645                         $tocline = preg_replace(
3646                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3647                                 array( '',                          '<$1>'),
3648                                 $safeHeadline
3649                         );
3650                         $tocline = trim( $tocline );
3651
3652                         # For the anchor, strip out HTML-y stuff period
3653                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3654                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3655                         $safeHeadline = trim( $safeHeadline );
3656
3657                         # Save headline for section edit hint before it's escaped
3658                         $headlineHint = $safeHeadline;
3659
3660                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
3661                                 # For reverse compatibility, provide an id that's
3662                                 # HTML4-compatible, like we used to.
3663                                 #
3664                                 # It may be worth noting, academically, that it's possible for
3665                                 # the legacy anchor to conflict with a non-legacy headline
3666                                 # anchor on the page.  In this case likely the "correct" thing
3667                                 # would be to either drop the legacy anchors or make sure
3668                                 # they're numbered first.  However, this would require people
3669                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3670                                 # manually, so let's not bother worrying about it.
3671                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3672                                         array( 'noninitial', 'legacy' ) );
3673                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3674
3675                                 if ( $legacyHeadline == $safeHeadline ) {
3676                                         # No reason to have both (in fact, we can't)
3677                                         $legacyHeadline = false;
3678                                 }
3679                         } else {
3680                                 $legacyHeadline = false;
3681                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3682                                         'noninitial' );
3683                         }
3684
3685                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3686                         # Does this apply to Unicode characters?  Because we aren't
3687                         # handling those here.
3688                         $arrayKey = strtolower( $safeHeadline );
3689                         if ( $legacyHeadline === false ) {
3690                                 $legacyArrayKey = false;
3691                         } else {
3692                                 $legacyArrayKey = strtolower( $legacyHeadline );
3693                         }
3694
3695                         # count how many in assoc. array so we can track dupes in anchors
3696                         if ( isset( $refers[$arrayKey] ) ) {
3697                                 $refers[$arrayKey]++;
3698                         } else {
3699                                 $refers[$arrayKey] = 1;
3700                         }
3701                         if ( isset( $refers[$legacyArrayKey] ) ) {
3702                                 $refers[$legacyArrayKey]++;
3703                         } else {
3704                                 $refers[$legacyArrayKey] = 1;
3705                         }
3706
3707                         # Don't number the heading if it is the only one (looks silly)
3708                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3709                                 # the two are different if the line contains a link
3710                                 $headline = $numbering . ' ' . $headline;
3711                         }
3712
3713                         # Create the anchor for linking from the TOC to the section
3714                         $anchor = $safeHeadline;
3715                         $legacyAnchor = $legacyHeadline;
3716                         if ( $refers[$arrayKey] > 1 ) {
3717                                 $anchor .= '_' . $refers[$arrayKey];
3718                         }
3719                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3720                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3721                         }
3722                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3723                                 $toc .= $sk->tocLine($anchor, $tocline,
3724                                         $numbering, $toclevel, ($isTemplate ? false : $sectionIndex));
3725                         }
3726
3727                         # Add the section to the section tree
3728                         # Find the DOM node for this header
3729                         while ( $node && !$isTemplate ) {
3730                                 if ( $node->getName() === 'h' ) {
3731                                         $bits = $node->splitHeading();
3732                                         if ( $bits['i'] == $sectionIndex )
3733                                                 break;
3734                                 }
3735                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3736                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3737                                 $node = $node->getNextSibling();
3738                         }
3739                         $tocraw[] = array(
3740                                 'toclevel' => $toclevel,
3741                                 'level' => $level,
3742                                 'line' => $tocline,
3743                                 'number' => $numbering,
3744                                 'index' => ($isTemplate ? 'T-' : '' ) . $sectionIndex,
3745                                 'fromtitle' => $titleText,
3746                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3747                                 'anchor' => $anchor,
3748                         );
3749
3750                         # give headline the correct <h#> tag
3751                         if( $showEditLink && $sectionIndex !== false ) {
3752                                 if( $isTemplate ) {
3753                                         # Put a T flag in the section identifier, to indicate to extractSections()
3754                                         # that sections inside <includeonly> should be counted.
3755                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3756                                 } else {
3757                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3758                                 }
3759                         } else {
3760                                 $editlink = '';
3761                         }
3762                         $head[$headlineCount] = $sk->makeHeadline( $level,
3763                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3764                                 $editlink, $legacyAnchor );
3765
3766                         $headlineCount++;
3767                 }
3768
3769                 $this->setOutputType( $oldType );
3770
3771                 # Never ever show TOC if no headers
3772                 if( $numVisible < 1 ) {
3773                         $enoughToc = false;
3774                 }
3775
3776                 if( $enoughToc ) {
3777                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3778                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3779                         }
3780                         $toc = $sk->tocList( $toc );
3781                         $this->mOutput->setTOCHTML( $toc );
3782                 }
3783
3784                 if ( $isMain ) {
3785                         $this->mOutput->setSections( $tocraw );
3786                 }
3787
3788                 # split up and insert constructed headlines
3789
3790                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3791                 $i = 0;
3792
3793                 foreach( $blocks as $block ) {
3794                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3795                                 # This is the [edit] link that appears for the top block of text when
3796                                 # section editing is enabled
3797
3798                                 # Disabled because it broke block formatting
3799                                 # For example, a bullet point in the top line
3800                                 # $full .= $sk->editSectionLink(0);
3801                         }
3802                         $full .= $block;
3803                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3804                                 # Top anchor now in skin
3805                                 $full = $full.$toc;
3806                         }
3807
3808                         if( !empty( $head[$i] ) ) {
3809                                 $full .= $head[$i];
3810                         }
3811                         $i++;
3812                 }
3813                 if( $this->mForceTocPosition ) {
3814                         return str_replace( '<!--MWTOC-->', $toc, $full );
3815                 } else {
3816                         return $full;
3817                 }
3818         }
3819
3820         /**
3821          * Merge $tree2 into $tree1 by replacing the section with index
3822          * $section in $tree1 and its descendants with the sections in $tree2.
3823          * Note that in the returned section tree, only the 'index' and
3824          * 'byteoffset' fields are guaranteed to be correct.
3825          * @param $tree1 array Section tree from ParserOutput::getSectons()
3826         *  @param $tree2 array Section tree
3827          * @param $section int Section index
3828          * @param $title Title Title both section trees come from
3829          * @param $len2 int Length of the original wikitext for $tree2
3830          * @return array Merged section tree
3831          */
3832         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3833                 global $wgContLang;
3834                 $newTree = array();
3835                 $targetLevel = false;
3836                 $merged = false;
3837                 $lastLevel = 1;
3838                 $nextIndex = 1;
3839                 $numbering = array( 0 );
3840                 $titletext = $title->getPrefixedDBkey();
3841                 foreach ( $tree1 as $s ) {
3842                         if ( $targetLevel !== false ) {
3843                                 if ( $s['level'] <= $targetLevel )
3844                                         // We've skipped enough
3845                                         $targetLevel = false;
3846                                 else
3847                                         continue;
3848                         }
3849                         if ( $s['index'] != $section ||
3850                                         $s['fromtitle'] != $titletext ) {
3851                                 self::incrementNumbering( $numbering,
3852                                         $s['toclevel'], $lastLevel );
3853
3854                                 // Rewrite index, byteoffset and number
3855                                 if ( $s['fromtitle'] == $titletext ) {
3856                                         $s['index'] = $nextIndex++;
3857                                         if ( $merged )
3858                                                 $s['byteoffset'] += $len2;
3859                                 }
3860                                 $s['number']  = implode( '.', array_map(
3861                                         array( $wgContLang, 'formatnum' ),
3862                                         $numbering ) );
3863                                 $lastLevel = $s['toclevel'];
3864                                 $newTree[] = $s;
3865                         } else {
3866                                 // We're at $section
3867                                 // Insert sections from $tree2 here
3868                                 foreach ( $tree2 as $s2 ) {
3869                                         // Rewrite the fields in $s2
3870                                         // before inserting it
3871                                         $s2['toclevel'] += $s['toclevel'] - 1;
3872                                         $s2['level'] += $s['level'] - 1;
3873                                         $s2['index'] = $nextIndex++;
3874                                         $s2['byteoffset'] += $s['byteoffset'];
3875
3876                                         self::incrementNumbering( $numbering,
3877                                                 $s2['toclevel'], $lastLevel );
3878                                         $s2['number']  = implode( '.', array_map(
3879                                                 array( $wgContLang, 'formatnum' ),
3880                                                 $numbering ) );
3881                                         $lastLevel = $s2['toclevel'];
3882                                         $newTree[] = $s2;
3883                                 }
3884                                 // Skip all descendants of $section in $tree1
3885                                 $targetLevel = $s['level'];
3886                                 $merged = true;
3887                         }
3888                 }
3889                 return $newTree;
3890         }
3891
3892         /**
3893          * Increment a section number. Helper function for mergeSectionTrees()
3894          * @param $number array Array representing a section number
3895          * @param $level int Current TOC level (depth)
3896          * @param $lastLevel int Level of previous TOC entry
3897          */
3898         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3899                 if ( $level > $lastLevel )
3900                         $number[$level - 1] = 1;
3901                 else if ( $level < $lastLevel ) {
3902                         foreach ( $number as $key => $unused )
3903                                 if ( $key >= $level )
3904                                         unset( $number[$key] );
3905                         $number[$level - 1]++;
3906                 } else
3907                         $number[$level - 1]++;
3908         }
3909
3910         /**
3911          * Transform wiki markup when saving a page by doing \r\n -> \n
3912          * conversion, substitting signatures, {{subst:}} templates, etc.
3913          *
3914          * @param string $text the text to transform
3915          * @param Title &$title the Title object for the current article
3916          * @param User $user the User object describing the current user
3917          * @param ParserOptions $options parsing options
3918          * @param bool $clearState whether to clear the parser state first
3919          * @return string the altered wiki markup
3920          * @public
3921          */
3922         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
3923                 $this->mOptions = $options;
3924                 $this->setTitle( $title );
3925                 $this->setOutputType( self::OT_WIKI );
3926
3927                 if ( $clearState ) {
3928                         $this->clearState();
3929                 }
3930
3931                 $pairs = array(
3932                         "\r\n" => "\n",
3933                 );
3934                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3935                 $text = $this->pstPass2( $text, $user );
3936                 $text = $this->mStripState->unstripBoth( $text );
3937                 return $text;
3938         }
3939
3940         /**
3941          * Pre-save transform helper function
3942          * @private
3943          */
3944         function pstPass2( $text, $user ) {
3945                 global $wgContLang, $wgLocaltimezone;
3946
3947                 /* Note: This is the timestamp saved as hardcoded wikitext to
3948                  * the database, we use $wgContLang here in order to give
3949                  * everyone the same signature and use the default one rather
3950                  * than the one selected in each user's preferences.
3951                  *
3952                  * (see also bug 12815)
3953                  */
3954                 $ts = $this->mOptions->getTimestamp();
3955                 if ( isset( $wgLocaltimezone ) ) {
3956                         $tz = $wgLocaltimezone;
3957                 } else {
3958                         $tz = date_default_timezone_get();
3959                 }
3960
3961                 $unixts = wfTimestamp( TS_UNIX, $ts );
3962                 $oldtz = date_default_timezone_get();
3963                 date_default_timezone_set( $tz );
3964                 $ts = date( 'YmdHis', $unixts );
3965                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
3966
3967                 /* Allow translation of timezones trough wiki. date() can return
3968                  * whatever crap the system uses, localised or not, so we cannot
3969                  * ship premade translations.
3970                  */
3971                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
3972                 $value = wfMsgForContent( $key );
3973                 if ( !wfEmptyMsg( $key, $value ) ) $tzMsg = $value;
3974
3975                 date_default_timezone_set( $oldtz );
3976
3977                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
3978
3979                 # Variable replacement
3980                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3981                 $text = $this->replaceVariables( $text );
3982
3983                 # Signatures
3984                 $sigText = $this->getUserSig( $user );
3985                 $text = strtr( $text, array(
3986                         '~~~~~' => $d,
3987                         '~~~~' => "$sigText $d",
3988                         '~~~' => $sigText
3989                 ) );
3990
3991                 # Context links: [[|name]] and [[name (context)|]]
3992                 #
3993                 global $wgLegalTitleChars;
3994                 $tc = "[$wgLegalTitleChars]";
3995                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3996
3997                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3998                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
3999                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4000                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4001
4002                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4003                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4004                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4005                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4006
4007                 $t = $this->mTitle->getText();
4008                 $m = array();
4009                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4010                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4011                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4012                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4013                 } else {
4014                         # if there's no context, don't bother duplicating the title
4015                         $text = preg_replace( $p2, '[[\\1]]', $text );
4016                 }
4017
4018                 # Trim trailing whitespace
4019                 $text = rtrim( $text );
4020
4021                 return $text;
4022         }
4023
4024         /**
4025          * Fetch the user's signature text, if any, and normalize to
4026          * validated, ready-to-insert wikitext.
4027          * If you have pre-fetched the nickname or the fancySig option, you can
4028          * specify them here to save a database query.
4029          *
4030          * @param User $user
4031          * @return string
4032          */
4033         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4034                 global $wgMaxSigChars;
4035
4036                 $username = $user->getName();
4037
4038                 // If not given, retrieve from the user object.
4039                 if ( $nickname === false )
4040                         $nickname = $user->getOption( 'nickname' );
4041
4042                 if ( is_null( $fancySig ) )
4043                         $fancySig = $user->getBoolOption( 'fancysig' );
4044
4045                 $nickname = $nickname == null ? $username : $nickname;
4046
4047                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4048                         $nickname = $username;
4049                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4050                 } elseif( $fancySig !== false ) {
4051                         # Sig. might contain markup; validate this
4052                         if( $this->validateSig( $nickname ) !== false ) {
4053                                 # Validated; clean up (if needed) and return it
4054                                 return $this->cleanSig( $nickname, true );
4055                         } else {
4056                                 # Failed to validate; fall back to the default
4057                                 $nickname = $username;
4058                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4059                         }
4060                 }
4061
4062                 // Make sure nickname doesnt get a sig in a sig
4063                 $nickname = $this->cleanSigInSig( $nickname );
4064
4065                 # If we're still here, make it a link to the user page
4066                 $userText = wfEscapeWikiText( $username );
4067                 $nickText = wfEscapeWikiText( $nickname );
4068                 if ( $user->isAnon() )  {
4069                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4070                 } else {
4071                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4072                 }
4073         }
4074
4075         /**
4076          * Check that the user's signature contains no bad XML
4077          *
4078          * @param string $text
4079          * @return mixed An expanded string, or false if invalid.
4080          */
4081         function validateSig( $text ) {
4082                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4083         }
4084
4085         /**
4086          * Clean up signature text
4087          *
4088          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4089          * 2) Substitute all transclusions
4090          *
4091          * @param string $text
4092          * @param $parsing Whether we're cleaning (preferences save) or parsing
4093          * @return string Signature text
4094          */
4095         function cleanSig( $text, $parsing = false ) {
4096                 if ( !$parsing ) {
4097                         global $wgTitle;
4098                         $this->clearState();
4099                         $this->setTitle( $wgTitle );
4100                         $this->mOptions = new ParserOptions;
4101                         $this->setOutputType = self::OT_PREPROCESS;
4102                 }
4103
4104                 # Option to disable this feature
4105                 if ( !$this->mOptions->getCleanSignatures() ) {
4106                         return $text;
4107                 }
4108
4109                 # FIXME: regex doesn't respect extension tags or nowiki
4110                 #  => Move this logic to braceSubstitution()
4111                 $substWord = MagicWord::get( 'subst' );
4112                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4113                 $substText = '{{' . $substWord->getSynonym( 0 );
4114
4115                 $text = preg_replace( $substRegex, $substText, $text );
4116                 $text = $this->cleanSigInSig( $text );
4117                 $dom = $this->preprocessToDom( $text );
4118                 $frame = $this->getPreprocessor()->newFrame();
4119                 $text = $frame->expand( $dom );
4120
4121                 if ( !$parsing ) {
4122                         $text = $this->mStripState->unstripBoth( $text );
4123                 }
4124
4125                 return $text;
4126         }
4127
4128         /**
4129          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4130          * @param string $text
4131          * @return string Signature text with /~{3,5}/ removed
4132          */
4133         function cleanSigInSig( $text ) {
4134                 $text = preg_replace( '/~{3,5}/', '', $text );
4135                 return $text;
4136         }
4137
4138         /**
4139          * Set up some variables which are usually set up in parse()
4140          * so that an external function can call some class members with confidence
4141          * @public
4142          */
4143         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4144                 $this->setTitle( $title );
4145                 $this->mOptions = $options;
4146                 $this->setOutputType( $outputType );
4147                 if ( $clearState ) {
4148                         $this->clearState();
4149                 }
4150         }
4151
4152         /**
4153          * Wrapper for preprocess()
4154          *
4155          * @param string $text the text to preprocess
4156          * @param ParserOptions $options  options
4157          * @return string
4158          * @public
4159          */
4160         function transformMsg( $text, $options ) {
4161                 global $wgTitle;
4162                 static $executing = false;
4163
4164                 # Guard against infinite recursion
4165                 if ( $executing ) {
4166                         return $text;
4167                 }
4168                 $executing = true;
4169
4170                 wfProfileIn(__METHOD__);
4171                 $text = $this->preprocess( $text, $wgTitle, $options );
4172
4173                 $executing = false;
4174                 wfProfileOut(__METHOD__);
4175                 return $text;
4176         }
4177
4178         /**
4179          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4180          * The callback should have the following form:
4181          *    function myParserHook( $text, $params, &$parser ) { ... }
4182          *
4183          * Transform and return $text. Use $parser for any required context, e.g. use
4184          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4185          *
4186          * @public
4187          *
4188          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4189          * @param mixed $callback The callback function (and object) to use for the tag
4190          *
4191          * @return The old value of the mTagHooks array associated with the hook
4192          */
4193         function setHook( $tag, $callback ) {
4194                 $tag = strtolower( $tag );
4195                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4196                 $this->mTagHooks[$tag] = $callback;
4197                 if( !in_array( $tag, $this->mStripList ) ) {
4198                         $this->mStripList[] = $tag;
4199                 }
4200
4201                 return $oldVal;
4202         }
4203
4204         function setTransparentTagHook( $tag, $callback ) {
4205                 $tag = strtolower( $tag );
4206                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4207                 $this->mTransparentTagHooks[$tag] = $callback;
4208
4209                 return $oldVal;
4210         }
4211
4212         /**
4213          * Remove all tag hooks
4214          */
4215         function clearTagHooks() {
4216                 $this->mTagHooks = array();
4217                 $this->mStripList = $this->mDefaultStripList;
4218         }
4219
4220         /**
4221          * Create a function, e.g. {{sum:1|2|3}}
4222          * The callback function should have the form:
4223          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4224          *
4225          * Or with SFH_OBJECT_ARGS:
4226          *    function myParserFunction( $parser, $frame, $args ) { ... }
4227          *
4228          * The callback may either return the text result of the function, or an array with the text
4229          * in element 0, and a number of flags in the other elements. The names of the flags are
4230          * specified in the keys. Valid flags are:
4231          *   found                     The text returned is valid, stop processing the template. This
4232          *                             is on by default.
4233          *   nowiki                    Wiki markup in the return value should be escaped
4234          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4235          *
4236          * @public
4237          *
4238          * @param string $id The magic word ID
4239          * @param mixed $callback The callback function (and object) to use
4240          * @param integer $flags a combination of the following flags:
4241          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4242          *
4243          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4244          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4245          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4246          *     the arguments, and to control the way they are expanded.
4247          *
4248          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4249          *     arguments, for instance:
4250          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4251          *
4252          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4253          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4254          *     working if/when this is changed.
4255          *
4256          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4257          *     expansion.
4258          *
4259          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4260          *     about the methods available in PPFrame and PPNode.
4261          *
4262          * @return The old callback function for this name, if any
4263          */
4264         function setFunctionHook( $id, $callback, $flags = 0 ) {
4265                 global $wgContLang;
4266
4267                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4268                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4269
4270                 # Add to function cache
4271                 $mw = MagicWord::get( $id );
4272                 if( !$mw )
4273                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4274
4275                 $synonyms = $mw->getSynonyms();
4276                 $sensitive = intval( $mw->isCaseSensitive() );
4277
4278                 foreach ( $synonyms as $syn ) {
4279                         # Case
4280                         if ( !$sensitive ) {
4281                                 $syn = $wgContLang->lc( $syn );
4282                         }
4283                         # Add leading hash
4284                         if ( !( $flags & SFH_NO_HASH ) ) {
4285                                 $syn = '#' . $syn;
4286                         }
4287                         # Remove trailing colon
4288                         if ( substr( $syn, -1, 1 ) === ':' ) {
4289                                 $syn = substr( $syn, 0, -1 );
4290                         }
4291                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4292                 }
4293                 return $oldVal;
4294         }
4295
4296         /**
4297          * Get all registered function hook identifiers
4298          *
4299          * @return array
4300          */
4301         function getFunctionHooks() {
4302                 return array_keys( $this->mFunctionHooks );
4303         }
4304
4305         /**
4306          * Create a tag function, e.g. <test>some stuff</test>.
4307          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4308          * Unlike parser functions, their content is not preprocessed.
4309          */
4310         function setFunctionTagHook( $tag, $callback, $flags ) {
4311                 $tag = strtolower( $tag );
4312                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4313                         $this->mFunctionTagHooks[$tag] : null;
4314                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4315
4316                 if( !in_array( $tag, $this->mStripList ) ) {
4317                         $this->mStripList[] = $tag;
4318                 }
4319
4320                 return $old;
4321         }
4322
4323         /**
4324          * FIXME: update documentation. makeLinkObj() is deprecated.
4325          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4326          * Placeholders created in Skin::makeLinkObj()
4327          * Returns an array of link CSS classes, indexed by PDBK.
4328          */
4329         function replaceLinkHolders( &$text, $options = 0 ) {
4330                 return $this->mLinkHolders->replace( $text );
4331         }
4332
4333         /**
4334          * Replace <!--LINK--> link placeholders with plain text of links
4335          * (not HTML-formatted).
4336          * @param string $text
4337          * @return string
4338          */
4339         function replaceLinkHoldersText( $text ) {
4340                 return $this->mLinkHolders->replaceText( $text );
4341         }
4342
4343         /**
4344          * Renders an image gallery from a text with one line per image.
4345          * text labels may be given by using |-style alternative text. E.g.
4346          *   Image:one.jpg|The number "1"
4347          *   Image:tree.jpg|A tree
4348          * given as text will return the HTML of a gallery with two images,
4349          * labeled 'The number "1"' and
4350          * 'A tree'.
4351          */
4352         function renderImageGallery( $text, $params ) {
4353                 $ig = new ImageGallery();
4354                 $ig->setContextTitle( $this->mTitle );
4355                 $ig->setShowBytes( false );
4356                 $ig->setShowFilename( false );
4357                 $ig->setParser( $this );
4358                 $ig->setHideBadImages();
4359                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4360                 $ig->useSkin( $this->mOptions->getSkin() );
4361                 $ig->mRevisionId = $this->mRevisionId;
4362
4363                 if( isset( $params['caption'] ) ) {
4364                         $caption = $params['caption'];
4365                         $caption = htmlspecialchars( $caption );
4366                         $caption = $this->replaceInternalLinks( $caption );
4367                         $ig->setCaptionHtml( $caption );
4368                 }
4369                 if( isset( $params['perrow'] ) ) {
4370                         $ig->setPerRow( $params['perrow'] );
4371                 }
4372                 if( isset( $params['widths'] ) ) {
4373                         $ig->setWidths( $params['widths'] );
4374                 }
4375                 if( isset( $params['heights'] ) ) {
4376                         $ig->setHeights( $params['heights'] );
4377                 }
4378
4379                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4380
4381                 $lines = StringUtils::explode( "\n", $text );
4382                 foreach ( $lines as $line ) {
4383                         # match lines like these:
4384                         # Image:someimage.jpg|This is some image
4385                         $matches = array();
4386                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4387                         # Skip empty lines
4388                         if ( count( $matches ) == 0 ) {
4389                                 continue;
4390                         }
4391
4392                         if ( strpos( $matches[0], '%' ) !== false )
4393                                 $matches[1] = urldecode( $matches[1] );
4394                         $tp = Title::newFromText( $matches[1]/*, NS_FILE*/ );
4395                         $nt =& $tp;
4396                         if( is_null( $nt ) ) {
4397                                 # Bogus title. Ignore these so we don't bomb out later.
4398                                 continue;
4399                         }
4400                         if ( isset( $matches[3] ) ) {
4401                                 $label = $matches[3];
4402                         } else {
4403                                 $label = '';
4404                         }
4405
4406                         $html = $this->recursiveTagParse( trim( $label ) );
4407
4408                         $ig->add( $nt, $html );
4409
4410                         # Only add real images (bug #5586)
4411                         if ( $nt->getNamespace() == NS_FILE ) {
4412                                 $this->mOutput->addImage( $nt->getDBkey() );
4413                         }
4414                 }
4415                 return $ig->toHTML();
4416         }
4417
4418         function getImageParams( $handler ) {
4419                 if ( $handler ) {
4420                         $handlerClass = get_class( $handler );
4421                 } else {
4422                         $handlerClass = '';
4423                 }
4424                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4425                         // Initialise static lists
4426                         static $internalParamNames = array(
4427                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4428                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4429                                         'bottom', 'text-bottom' ),
4430                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4431                                         'upright', 'border', 'link', 'alt' ),
4432                         );
4433                         static $internalParamMap;
4434                         if ( !$internalParamMap ) {
4435                                 $internalParamMap = array();
4436                                 foreach ( $internalParamNames as $type => $names ) {
4437                                         foreach ( $names as $name ) {
4438                                                 $magicName = str_replace( '-', '_', "img_$name" );
4439                                                 $internalParamMap[$magicName] = array( $type, $name );
4440                                         }
4441                                 }
4442                         }
4443
4444                         // Add handler params
4445                         $paramMap = $internalParamMap;
4446                         if ( $handler ) {
4447                                 $handlerParamMap = $handler->getParamMap();
4448                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4449                                         $paramMap[$magic] = array( 'handler', $paramName );
4450                                 }
4451                         }
4452                         $this->mImageParams[$handlerClass] = $paramMap;
4453                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4454                 }
4455                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4456         }
4457
4458         /**
4459          * Parse image options text and use it to make an image
4460          * @param Title $title
4461          * @param string $options
4462          * @param LinkHolderArray $holders
4463          */
4464         function makeImage( $title, $options, $holders = false ) {
4465                 # Check if the options text is of the form "options|alt text"
4466                 # Options are:
4467                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4468                 #  * left       no resizing, just left align. label is used for alt= only
4469                 #  * right      same, but right aligned
4470                 #  * none       same, but not aligned
4471                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4472                 #  * center     center the image
4473                 #  * frame      Keep original image size, no magnify-button.
4474                 #  * framed     Same as "frame"
4475                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4476                 #  * upright    reduce width for upright images, rounded to full __0 px
4477                 #  * border     draw a 1px border around the image
4478                 #  * alt        Text for HTML alt attribute (defaults to empty)
4479                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4480                 # vertical-align values (no % or length right now):
4481                 #  * baseline
4482                 #  * sub
4483                 #  * super
4484                 #  * top
4485                 #  * text-top
4486                 #  * middle
4487                 #  * bottom
4488                 #  * text-bottom
4489
4490                 $parts = StringUtils::explode( "|", $options );
4491                 $sk = $this->mOptions->getSkin();
4492
4493                 # Give extensions a chance to select the file revision for us
4494                 $skip = $time = $descQuery = false;
4495                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4496
4497                 if ( $skip ) {
4498                         return $sk->link( $title );
4499                 }
4500
4501                 # Get the file
4502                 $imagename = $title->getDBkey();
4503                 $file = wfFindFile( $title, array( 'time' => $time ) );
4504                 # Get parameter map
4505                 $handler = $file ? $file->getHandler() : false;
4506
4507                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4508
4509                 # Process the input parameters
4510                 $caption = '';
4511                 $params = array( 'frame' => array(), 'handler' => array(),
4512                         'horizAlign' => array(), 'vertAlign' => array() );
4513                 foreach( $parts as $part ) {
4514                         $part = trim( $part );
4515                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4516                         $validated = false;
4517                         if( isset( $paramMap[$magicName] ) ) {
4518                                 list( $type, $paramName ) = $paramMap[$magicName];
4519
4520                                 // Special case; width and height come in one variable together
4521                                 if( $type === 'handler' && $paramName === 'width' ) {
4522                                         $m = array();
4523                                         # (bug 13500) In both cases (width/height and width only),
4524                                         # permit trailing "px" for backward compatibility.
4525                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4526                                                 $width = intval( $m[1] );
4527                                                 $height = intval( $m[2] );
4528                                                 if ( $handler->validateParam( 'width', $width ) ) {
4529                                                         $params[$type]['width'] = $width;
4530                                                         $validated = true;
4531                                                 }
4532                                                 if ( $handler->validateParam( 'height', $height ) ) {
4533                                                         $params[$type]['height'] = $height;
4534                                                         $validated = true;
4535                                                 }
4536                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4537                                                 $width = intval( $value );
4538                                                 if ( $handler->validateParam( 'width', $width ) ) {
4539                                                         $params[$type]['width'] = $width;
4540                                                         $validated = true;
4541                                                 }
4542                                         } // else no validation -- bug 13436
4543                                 } else {
4544                                         if ( $type === 'handler' ) {
4545                                                 # Validate handler parameter
4546                                                 $validated = $handler->validateParam( $paramName, $value );
4547                                         } else {
4548                                                 # Validate internal parameters
4549                                                 switch( $paramName ) {
4550                                                 case 'manualthumb':
4551                                                 case 'alt':
4552                                                         // @todo Fixme: possibly check validity here for
4553                                                         // manualthumb? downstream behavior seems odd with
4554                                                         // missing manual thumbs.
4555                                                         $validated = true;
4556                                                         $value = $this->stripAltText( $value, $holders );
4557                                                         break;
4558                                                 case 'link':
4559                                                         $chars = self::EXT_LINK_URL_CLASS;
4560                                                         $prots = $this->mUrlProtocols;
4561                                                         if ( $value === '' ) {
4562                                                                 $paramName = 'no-link';
4563                                                                 $value = true;
4564                                                                 $validated = true;
4565                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4566                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4567                                                                         $paramName = 'link-url';
4568                                                                         $this->mOutput->addExternalLink( $value );
4569                                                                         $validated = true;
4570                                                                 }
4571                                                         } else {
4572                                                                 $linkTitle = Title::newFromText( $value );
4573                                                                 if ( $linkTitle ) {
4574                                                                         $paramName = 'link-title';
4575                                                                         $value = $linkTitle;
4576                                                                         $this->mOutput->addLink( $linkTitle );
4577                                                                         $validated = true;
4578                                                                 }
4579                                                         }
4580                                                         break;
4581                                                 default:
4582                                                         // Most other things appear to be empty or numeric...
4583                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4584                                                 }
4585                                         }
4586
4587                                         if ( $validated ) {
4588                                                 $params[$type][$paramName] = $value;
4589                                         }
4590                                 }
4591                         }
4592                         if ( !$validated ) {
4593                                 $caption = $part;
4594                         }
4595                 }
4596
4597                 # Process alignment parameters
4598                 if ( $params['horizAlign'] ) {
4599                         $params['frame']['align'] = key( $params['horizAlign'] );
4600                 }
4601                 if ( $params['vertAlign'] ) {
4602                         $params['frame']['valign'] = key( $params['vertAlign'] );
4603                 }
4604
4605                 $params['frame']['caption'] = $caption;
4606
4607                 # Will the image be presented in a frame, with the caption below?
4608                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4609                                  isset( $params['frame']['framed'] ) ||
4610                                  isset( $params['frame']['thumbnail'] ) ||
4611                                  isset( $params['frame']['manualthumb'] );
4612
4613                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4614                 # came to also set the caption, ordinary text after the image -- which
4615                 # makes no sense, because that just repeats the text multiple times in
4616                 # screen readers.  It *also* came to set the title attribute.
4617                 #
4618                 # Now that we have an alt attribute, we should not set the alt text to
4619                 # equal the caption: that's worse than useless, it just repeats the
4620                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4621                 # use the unnamed parameter for alt text as well, just for the time be-
4622                 # ing, if the unnamed param is set and the alt param is not.
4623                 #
4624                 # For the future, we need to figure out if we want to tweak this more,
4625                 # e.g., introducing a title= parameter for the title; ignoring the un-
4626                 # named parameter entirely for images without a caption; adding an ex-
4627                 # plicit caption= parameter and preserving the old magic unnamed para-
4628                 # meter for BC; ...
4629                 if ( $imageIsFramed ) { # Framed image
4630                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4631                                 # No caption or alt text, add the filename as the alt text so
4632                                 # that screen readers at least get some description of the image
4633                                 $params['frame']['alt'] = $title->getText();
4634                         }
4635                         # Do not set $params['frame']['title'] because tooltips don't make sense
4636                         # for framed images
4637                 } else { # Inline image
4638                         if ( !isset( $params['frame']['alt'] ) ) {
4639                                 # No alt text, use the "caption" for the alt text
4640                                 if ( $caption !== '') {
4641                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4642                                 } else {
4643                                         # No caption, fall back to using the filename for the
4644                                         # alt text
4645                                         $params['frame']['alt'] = $title->getText();
4646                                 }
4647                         }
4648                         # Use the "caption" for the tooltip text
4649                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4650                 }
4651
4652                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4653
4654                 # Linker does the rest
4655                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4656
4657                 # Give the handler a chance to modify the parser object
4658                 if ( $handler ) {
4659                         $handler->parserTransformHook( $this, $file );
4660                 }
4661
4662                 return $ret;
4663         }
4664
4665         protected function stripAltText( $caption, $holders ) {
4666                 # Strip bad stuff out of the title (tooltip).  We can't just use
4667                 # replaceLinkHoldersText() here, because if this function is called
4668                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4669                 if ( $holders ) {
4670                         $tooltip = $holders->replaceText( $caption );
4671                 } else {
4672                         $tooltip = $this->replaceLinkHoldersText( $caption );
4673                 }
4674
4675                 # make sure there are no placeholders in thumbnail attributes
4676                 # that are later expanded to html- so expand them now and
4677                 # remove the tags
4678                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4679                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4680
4681                 return $tooltip;
4682         }
4683
4684         /**
4685          * Set a flag in the output object indicating that the content is dynamic and
4686          * shouldn't be cached.
4687          */
4688         function disableCache() {
4689                 wfDebug( "Parser output marked as uncacheable.\n" );
4690                 $this->mOutput->mCacheTime = -1;
4691         }
4692
4693         /**#@+
4694          * Callback from the Sanitizer for expanding items found in HTML attribute
4695          * values, so they can be safely tested and escaped.
4696          * @param string $text
4697          * @param PPFrame $frame
4698          * @return string
4699          * @private
4700          */
4701         function attributeStripCallback( &$text, $frame = false ) {
4702                 $text = $this->replaceVariables( $text, $frame );
4703                 $text = $this->mStripState->unstripBoth( $text );
4704                 return $text;
4705         }
4706
4707         /**#@-*/
4708
4709         /**#@+
4710          * Accessor/mutator
4711          */
4712         function Title( $x = null ) { return wfSetVar( $this->mTitle, $x ); }
4713         function Options( $x = null ) { return wfSetVar( $this->mOptions, $x ); }
4714         function OutputType( $x = null ) { return wfSetVar( $this->mOutputType, $x ); }
4715         /**#@-*/
4716
4717         /**#@+
4718          * Accessor
4719          */
4720         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4721         /**#@-*/
4722
4723
4724         /**
4725          * Break wikitext input into sections, and either pull or replace
4726          * some particular section's text.
4727          *
4728          * External callers should use the getSection and replaceSection methods.
4729          *
4730          * @param string $text Page wikitext
4731          * @param string $section A section identifier string of the form:
4732          *   <flag1> - <flag2> - ... - <section number>
4733          *
4734          * Currently the only recognised flag is "T", which means the target section number
4735          * was derived during a template inclusion parse, in other words this is a template
4736          * section edit link. If no flags are given, it was an ordinary section edit link.
4737          * This flag is required to avoid a section numbering mismatch when a section is
4738          * enclosed by <includeonly> (bug 6563).
4739          *
4740          * The section number 0 pulls the text before the first heading; other numbers will
4741          * pull the given section along with its lower-level subsections. If the section is
4742          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4743          *
4744          * @param string $mode One of "get" or "replace"
4745          * @param string $newText Replacement text for section data.
4746          * @return string for "get", the extracted section text.
4747          *                for "replace", the whole page with the section replaced.
4748          */
4749         private function extractSections( $text, $section, $mode, $newText='' ) {
4750                 global $wgTitle;
4751                 $this->clearState();
4752                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4753                 $this->mOptions = new ParserOptions;
4754                 $this->setOutputType( self::OT_WIKI );
4755                 $outText = '';
4756                 $frame = $this->getPreprocessor()->newFrame();
4757
4758                 // Process section extraction flags
4759                 $flags = 0;
4760                 $sectionParts = explode( '-', $section );
4761                 $sectionIndex = array_pop( $sectionParts );
4762                 foreach ( $sectionParts as $part ) {
4763                         if ( $part === 'T' ) {
4764                                 $flags |= self::PTD_FOR_INCLUSION;
4765                         }
4766                 }
4767                 // Preprocess the text
4768                 $root = $this->preprocessToDom( $text, $flags );
4769
4770                 // <h> nodes indicate section breaks
4771                 // They can only occur at the top level, so we can find them by iterating the root's children
4772                 $node = $root->getFirstChild();
4773
4774                 // Find the target section
4775                 if ( $sectionIndex == 0 ) {
4776                         // Section zero doesn't nest, level=big
4777                         $targetLevel = 1000;
4778                 } else {
4779             while ( $node ) {
4780                 if ( $node->getName() === 'h' ) {
4781                     $bits = $node->splitHeading();
4782                                         if ( $bits['i'] == $sectionIndex ) {
4783                                         $targetLevel = $bits['level'];
4784                                                 break;
4785                                         }
4786                                 }
4787                                 if ( $mode === 'replace' ) {
4788                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4789                                 }
4790                                 $node = $node->getNextSibling();
4791                         }
4792                 }
4793
4794                 if ( !$node ) {
4795                         // Not found
4796                         if ( $mode === 'get' ) {
4797                                 return $newText;
4798                         } else {
4799                                 return $text;
4800                         }
4801                 }
4802
4803                 // Find the end of the section, including nested sections
4804                 do {
4805                         if ( $node->getName() === 'h' ) {
4806                                 $bits = $node->splitHeading();
4807                                 $curLevel = $bits['level'];
4808                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4809                                         break;
4810                                 }
4811                         }
4812                         if ( $mode === 'get' ) {
4813                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4814                         }
4815                         $node = $node->getNextSibling();
4816                 } while ( $node );
4817
4818                 // Write out the remainder (in replace mode only)
4819                 if ( $mode === 'replace' ) {
4820                         // Output the replacement text
4821                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4822                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4823                         // Only add trailing whitespace if there is newText
4824                         if($newText != "") {
4825                                 $outText .= $newText . "\n\n";
4826                         }
4827
4828                         while ( $node ) {
4829                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4830                                 $node = $node->getNextSibling();
4831                         }
4832                 }
4833
4834                 if ( is_string( $outText ) ) {
4835                         // Re-insert stripped tags
4836                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4837                 }
4838
4839                 return $outText;
4840         }
4841
4842         /**
4843          * This function returns the text of a section, specified by a number ($section).
4844          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4845          * the first section before any such heading (section 0).
4846          *
4847          * If a section contains subsections, these are also returned.
4848          *
4849          * @param string $text text to look in
4850          * @param string $section section identifier
4851          * @param string $deftext default to return if section is not found
4852          * @return string text of the requested section
4853          */
4854         public function getSection( $text, $section, $deftext='' ) {
4855                 return $this->extractSections( $text, $section, "get", $deftext );
4856         }
4857
4858         public function replaceSection( $oldtext, $section, $text ) {
4859                 return $this->extractSections( $oldtext, $section, "replace", $text );
4860         }
4861
4862         /**
4863          * Get the timestamp associated with the current revision, adjusted for
4864          * the default server-local timestamp
4865          */
4866         function getRevisionTimestamp() {
4867                 if ( is_null( $this->mRevisionTimestamp ) ) {
4868                         wfProfileIn( __METHOD__ );
4869                         global $wgContLang;
4870                         $dbr = wfGetDB( DB_SLAVE );
4871                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4872                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4873
4874                         // Normalize timestamp to internal MW format for timezone processing.
4875                         // This has the added side-effect of replacing a null value with
4876                         // the current time, which gives us more sensible behavior for
4877                         // previews.
4878                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4879
4880                         // The cryptic '' timezone parameter tells to use the site-default
4881                         // timezone offset instead of the user settings.
4882                         //
4883                         // Since this value will be saved into the parser cache, served
4884                         // to other users, and potentially even used inside links and such,
4885                         // it needs to be consistent for all visitors.
4886                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4887
4888                         wfProfileOut( __METHOD__ );
4889                 }
4890                 return $this->mRevisionTimestamp;
4891         }
4892
4893         /**
4894          * Get the name of the user that edited the last revision
4895          */
4896         function getRevisionUser() {
4897                 // if this template is subst: the revision id will be blank,
4898                 // so just use the current user's name
4899                 if( $this->mRevisionId ) {
4900                         $revision = Revision::newFromId( $this->mRevisionId );
4901                         $revuser = $revision->getUserText();
4902                 } else {
4903                         global $wgUser;
4904                         $revuser = $wgUser->getName();
4905                 }
4906                 return $revuser;
4907         }
4908
4909         /**
4910          * Mutator for $mDefaultSort
4911          *
4912          * @param $sort New value
4913          */
4914         public function setDefaultSort( $sort ) {
4915                 $this->mDefaultSort = $sort;
4916         }
4917
4918         /**
4919          * Accessor for $mDefaultSort
4920          * Will use the title/prefixed title if none is set
4921          *
4922          * @return string
4923          */
4924         public function getDefaultSort() {
4925                 global $wgCategoryPrefixedDefaultSortkey;
4926                 if( $this->mDefaultSort !== false ) {
4927                         return $this->mDefaultSort;
4928                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4929                         !$wgCategoryPrefixedDefaultSortkey) {
4930                         return $this->mTitle->getText();
4931                 } else {
4932                         return $this->mTitle->getPrefixedText();
4933                 }
4934         }
4935
4936         /**
4937          * Accessor for $mDefaultSort
4938          * Unlike getDefaultSort(), will return false if none is set
4939          *
4940          * @return string or false
4941          */
4942         public function getCustomDefaultSort() {
4943                 return $this->mDefaultSort;
4944         }
4945
4946         /**
4947          * Try to guess the section anchor name based on a wikitext fragment
4948          * presumably extracted from a heading, for example "Header" from
4949          * "== Header ==".
4950          */
4951         public function guessSectionNameFromWikiText( $text ) {
4952                 # Strip out wikitext links(they break the anchor)
4953                 $text = $this->stripSectionName( $text );
4954                 $headline = Sanitizer::decodeCharReferences( $text );
4955                 # strip out HTML
4956                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4957                 $headline = trim( $headline );
4958                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4959                 $replacearray = array(
4960                         '%3A' => ':',
4961                         '%' => '.'
4962                 );
4963                 return str_replace(
4964                         array_keys( $replacearray ),
4965                         array_values( $replacearray ),
4966                         $sectionanchor );
4967         }
4968
4969         /**
4970          * Strips a text string of wikitext for use in a section anchor
4971          *
4972          * Accepts a text string and then removes all wikitext from the
4973          * string and leaves only the resultant text (i.e. the result of
4974          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4975          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4976          * to create valid section anchors by mimicing the output of the
4977          * parser when headings are parsed.
4978          *
4979          * @param $text string Text string to be stripped of wikitext
4980          * for use in a Section anchor
4981          * @return Filtered text string
4982          */
4983         public function stripSectionName( $text ) {
4984                 # Strip internal link markup
4985                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4986                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4987
4988                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4989                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4990                 # on how many empty links there are on the page - need to figure that out.
4991                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4992
4993                 # Parse wikitext quotes (italics & bold)
4994                 $text = $this->doQuotes($text);
4995
4996                 # Strip HTML tags
4997                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4998                 return $text;
4999         }
5000
5001         function srvus( $text ) {
5002                 return $this->testSrvus( $text, $this->mOutputType );
5003         }
5004
5005         /**
5006          * strip/replaceVariables/unstrip for preprocessor regression testing
5007          */
5008         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5009                 $this->clearState();
5010                 if ( ! ( $title instanceof Title ) ) {
5011                         $title = Title::newFromText( $title );
5012                 }
5013                 $this->mTitle = $title;
5014                 $this->mOptions = $options;
5015                 $this->setOutputType( $outputType );
5016                 $text = $this->replaceVariables( $text );
5017                 $text = $this->mStripState->unstripBoth( $text );
5018                 $text = Sanitizer::removeHTMLtags( $text );
5019                 return $text;
5020         }
5021
5022         function testPst( $text, $title, $options ) {
5023                 global $wgUser;
5024                 if ( ! ( $title instanceof Title ) ) {
5025                         $title = Title::newFromText( $title );
5026                 }
5027                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5028         }
5029
5030         function testPreprocess( $text, $title, $options ) {
5031                 if ( ! ( $title instanceof Title ) ) {
5032                         $title = Title::newFromText( $title );
5033                 }
5034                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5035         }
5036
5037         function markerSkipCallback( $s, $callback ) {
5038                 $i = 0;
5039                 $out = '';
5040                 while ( $i < strlen( $s ) ) {
5041                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5042                         if ( $markerStart === false ) {
5043                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5044                                 break;
5045                         } else {
5046                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5047                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5048                                 if ( $markerEnd === false ) {
5049                                         $out .= substr( $s, $markerStart );
5050                                         break;
5051                                 } else {
5052                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5053                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5054                                         $i = $markerEnd;
5055                                 }
5056                         }
5057                 }
5058                 return $out;
5059         }
5060
5061         function serialiseHalfParsedText( $text ) {
5062                 $data = array();
5063                 $data['text'] = $text;
5064
5065                 // First, find all strip markers, and store their
5066                 //  data in an array.
5067                 $stripState = new StripState;
5068                 $pos = 0;
5069                 while( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) ) && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) ) {
5070                         $end_pos += strlen( self::MARKER_SUFFIX );
5071                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5072
5073                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5074                                 $replaceArray = $stripState->general;
5075                                 $stripText = $this->mStripState->general->data[$marker];
5076                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5077                                 $replaceArray = $stripState->nowiki;
5078                                 $stripText = $this->mStripState->nowiki->data[$marker];
5079                         } else {
5080                                 throw new MWException( "Hanging strip marker: '$marker'." );
5081                         }
5082
5083                         $replaceArray->setPair( $marker, $stripText );
5084                         $pos = $end_pos;
5085                 }
5086                 $data['stripstate'] = $stripState;
5087
5088                 // Now, find all of our links, and store THEIR
5089                 //  data in an array! :)
5090                 $links = array( 'internal' => array(), 'interwiki' => array() );
5091                 $pos = 0;
5092
5093                 // Internal links
5094                 while( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5095                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5096
5097                         $ns = trim($ns);
5098                         if (empty( $links['internal'][$ns] )) {
5099                                 $links['internal'][$ns] = array();
5100                         }
5101
5102                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5103                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5104                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5105                 }
5106
5107                 $pos = 0;
5108
5109                 // Interwiki links
5110                 while( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5111                         $data = substr( $text, $start_pos );
5112                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5113                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5114                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5115                 }
5116
5117                 $data['linkholder'] = $links;
5118
5119                 return $data;
5120         }
5121
5122         function unserialiseHalfParsedText( $data, $intPrefix = null /* Unique identifying prefix */ ) {
5123                 if (!$intPrefix)
5124                         $intPrefix = $this->getRandomString();
5125
5126                 // First, extract the strip state.
5127                 $stripState = $data['stripstate'];
5128                 $this->mStripState->general->merge( $stripState->general );
5129                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5130
5131                 // Now, extract the text, and renumber links
5132                 $text = $data['text'];
5133                 $links = $data['linkholder'];
5134
5135                 // Internal...
5136                 foreach( $links['internal'] as $ns => $nsLinks ) {
5137                         foreach( $nsLinks as $key => $entry ) {
5138                                 $newKey = $intPrefix . '-' . $key;
5139                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5140
5141                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5142                         }
5143                 }
5144
5145                 // Interwiki...
5146                 foreach( $links['interwiki'] as $key => $entry ) {
5147                         $newKey = "$intPrefix-$key";
5148                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5149
5150                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5151                 }
5152
5153                 // Should be good to go.
5154                 return $text;
5155         }
5156 }
5157
5158 /**
5159  * @todo document, briefly.
5160  * @ingroup Parser
5161  */
5162 class StripState {
5163         var $general, $nowiki;
5164
5165         function __construct() {
5166                 $this->general = new ReplacementArray;
5167                 $this->nowiki = new ReplacementArray;
5168         }
5169
5170         function unstripGeneral( $text ) {
5171                 wfProfileIn( __METHOD__ );
5172                 do {
5173                         $oldText = $text;
5174                         $text = $this->general->replace( $text );
5175                 } while ( $text !== $oldText );
5176                 wfProfileOut( __METHOD__ );
5177                 return $text;
5178         }
5179
5180         function unstripNoWiki( $text ) {
5181                 wfProfileIn( __METHOD__ );
5182                 do {
5183                         $oldText = $text;
5184                         $text = $this->nowiki->replace( $text );
5185                 } while ( $text !== $oldText );
5186                 wfProfileOut( __METHOD__ );
5187                 return $text;
5188         }
5189
5190         function unstripBoth( $text ) {
5191                 wfProfileIn( __METHOD__ );
5192                 do {
5193                         $oldText = $text;
5194                         $text = $this->general->replace( $text );
5195                         $text = $this->nowiki->replace( $text );
5196                 } while ( $text !== $oldText );
5197                 wfProfileOut( __METHOD__ );
5198                 return $text;
5199         }
5200 }
5201
5202 /**
5203  * @todo document, briefly.
5204  * @ingroup Parser
5205  */
5206 class OnlyIncludeReplacer {
5207         var $output = '';
5208
5209         function replace( $matches ) {
5210                 if ( substr( $matches[1], -1 ) === "\n" ) {
5211                         $this->output .= substr( $matches[1], 0, -1 );
5212                 } else {
5213                         $this->output .= $matches[1];
5214                 }
5215         }
5216 }