includes/Parser.php

   1 <?php
   2
   3 /**
   4  *
   5  * File for Parser and related classes
   6  *
   7  * @addtogroup Parser
   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  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @addtogroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/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         /**#@+
  87          * @private
  88          */
  89         # Persistent:
  90         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  91                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerSuffix, $mMarkerIndex,
  92                 $mExtLinkBracketedRegex, $mPreprocessor, $mDefaultStripList, $mVarCache, $mConf;
  93
  94
  95         # Cleared with clearState():
  96         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  97         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  98         var $mInterwikiLinkHolders, $mLinkHolders;
  99         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 100         var $mTplExpandCache; // empty-frame expansion cache
 101         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 102
 103         # Temporary
 104         # These are variables reset at least once per parse regardless of $clearState
 105         var $mOptions,      // ParserOptions object
 106                 $mTitle,        // Title context, used for self-link rendering and similar things
 107                 $mOutputType,   // Output type, one of the OT_xxx constants
 108                 $ot,            // Shortcut alias, see setOutputType()
 109                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 110                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 111                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 112
 113         /**#@-*/
 114
 115         /**
 116          * Constructor
 117          *
 118          * @public
 119          */
 120         function __construct( $conf = array() ) {
 121                 $this->mConf = $conf;
 122                 $this->mTagHooks = array();
 123                 $this->mTransparentTagHooks = array();
 124                 $this->mFunctionHooks = array();
 125                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 126                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery' );
 127                 $this->mMarkerSuffix = "-QINU\x7f";
 128                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 129                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 130                 $this->mVarCache = array();
 131                 if ( isset( $conf['preprocessorClass'] ) ) {
 132                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 133                 } else {
 134                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 135                 }
 136                 $this->mMarkerIndex = 0;
 137                 $this->mFirstCall = true;
 138         }
 139
 140         /**
 141          * Do various kinds of initialisation on the first call of the parser
 142          */
 143         function firstCallInit() {
 144                 if ( !$this->mFirstCall ) {
 145                         return;
 146                 }
 147                 $this->mFirstCall = false;
 148
 149                 wfProfileIn( __METHOD__ );
 150
 151                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 152                 CoreParserFunctions::register( $this );
 153                 $this->initialiseVariables();
 154
 155                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 156                 wfProfileOut( __METHOD__ );
 157         }
 158
 159         /**
 160          * Clear Parser state
 161          *
 162          * @private
 163          */
 164         function clearState() {
 165                 wfProfileIn( __METHOD__ );
 166                 if ( $this->mFirstCall ) {
 167                         $this->firstCallInit();
 168                 }
 169                 $this->mOutput = new ParserOutput;
 170                 $this->mAutonumber = 0;
 171                 $this->mLastSection = '';
 172                 $this->mDTopen = false;
 173                 $this->mIncludeCount = array();
 174                 $this->mStripState = new StripState;
 175                 $this->mArgStack = false;
 176                 $this->mInPre = false;
 177                 $this->mInterwikiLinkHolders = array(
 178                         'texts' => array(),
 179                         'titles' => array()
 180                 );
 181                 $this->mLinkHolders = array(
 182                         'namespaces' => array(),
 183                         'dbkeys' => array(),
 184                         'queries' => array(),
 185                         'texts' => array(),
 186                         'titles' => array()
 187                 );
 188                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 189
 190                 /**
 191                  * Prefix for temporary replacement strings for the multipass parser.
 192                  * \x07 should never appear in input as it's disallowed in XML.
 193                  * Using it at the front also gives us a little extra robustness
 194                  * since it shouldn't match when butted up against identifier-like
 195                  * string constructs.
 196                  *
 197                  * Must not consist of all title characters, or else it will change
 198                  * the behaviour of <nowiki> in a link.
 199                  */
 200                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 201                 # Changed to \x7f to allow XML double-parsing -- TS
 202                 $this->mUniqPrefix = "\x7fUNIQ" . Parser::getRandomString();
 203
 204
 205                 # Clear these on every parse, bug 4549
 206                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 207
 208                 $this->mShowToc = true;
 209                 $this->mForceTocPosition = false;
 210                 $this->mIncludeSizes = array(
 211                         'post-expand' => 0,
 212                         'arg' => 0,
 213                 );
 214                 $this->mPPNodeCount = 0;
 215                 $this->mDefaultSort = false;
 216                 $this->mHeadings = array();
 217                 $this->mDoubleUnderscores = array();
 218
 219                 # Fix cloning
 220                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 221                         $this->mPreprocessor = null;
 222                 }
 223
 224                 wfRunHooks( 'ParserClearState', array( &$this ) );
 225                 wfProfileOut( __METHOD__ );
 226         }
 227
 228         function setOutputType( $ot ) {
 229                 $this->mOutputType = $ot;
 230                 // Shortcut alias
 231                 $this->ot = array(
 232                         'html' => $ot == self::OT_HTML,
 233                         'wiki' => $ot == self::OT_WIKI,
 234                         'pre' => $ot == self::OT_PREPROCESS,
 235                 );
 236         }
 237
 238         /**
 239          * Set the context title
 240          */
 241         function setTitle( $t ) {
 242                 if ( !$t || $t instanceof FakeTitle ) {
 243                         $t = Title::newFromText( 'NO TITLE' );
 244                 }
 245                 if ( strval( $t->getFragment() ) !== '' ) {
 246                         # Strip the fragment to avoid various odd effects
 247                         $this->mTitle = clone $t;
 248                         $this->mTitle->setFragment( '' );
 249                 } else {
 250                         $this->mTitle = $t;
 251                 }
 252         }
 253
 254         /**
 255          * Accessor for mUniqPrefix.
 256          *
 257          * @public
 258          */
 259         function uniqPrefix() {
 260                 if( !isset( $this->mUniqPrefix ) ) {
 261                         // @fixme this is probably *horribly wrong*
 262                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 263                         // if this is called for a parser cache hit, the parser may not
 264                         // have ever been initialized in the first place.
 265                         // Not really sure what the heck is supposed to be going on here.
 266                         return '';
 267                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 268                 }
 269                 return $this->mUniqPrefix;
 270         }
 271
 272         /**
 273          * Convert wikitext to HTML
 274          * Do not call this function recursively.
 275          *
 276          * @param string $text Text we want to parse
 277          * @param Title &$title A title object
 278          * @param array $options
 279          * @param boolean $linestart
 280          * @param boolean $clearState
 281          * @param int $revid number to pass in {{REVISIONID}}
 282          * @return ParserOutput a ParserOutput
 283          */
 284         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 285                 /**
 286                  * First pass--just handle <nowiki> sections, pass the rest off
 287                  * to internalParse() which does all the real work.
 288                  */
 289
 290                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 291                 $fname = 'Parser::parse-' . wfGetCaller();
 292                 wfProfileIn( __METHOD__ );
 293                 wfProfileIn( $fname );
 294
 295                 if ( $clearState ) {
 296                         $this->clearState();
 297                 }
 298
 299                 $this->mOptions = $options;
 300                 $this->setTitle( $title );
 301                 $oldRevisionId = $this->mRevisionId;
 302                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 303                 if( $revid !== null ) {
 304                         $this->mRevisionId = $revid;
 305                         $this->mRevisionTimestamp = null;
 306                 }
 307                 $this->setOutputType( self::OT_HTML );
 308                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 309                 # No more strip!
 310                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 311                 $text = $this->internalParse( $text );
 312                 $text = $this->mStripState->unstripGeneral( $text );
 313
 314                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 315                 $fixtags = array(
 316                         # french spaces, last one Guillemet-left
 317                         # only if there is something before the space
 318                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 319                         # french spaces, Guillemet-right
 320                         '/(\\302\\253) /' => '\\1&nbsp;',
 321                         '/&nbsp;(!important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 322                 );
 323                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 324
 325                 # only once and last
 326                 $text = $this->doBlockLevels( $text, $linestart );
 327
 328                 $this->replaceLinkHolders( $text );
 329
 330                 # the position of the parserConvert() call should not be changed. it
 331                 # assumes that the links are all replaced and the only thing left
 332                 # is the <nowiki> mark.
 333                 # Side-effects: this calls $this->mOutput->setTitleText()
 334                 $text = $wgContLang->parserConvert( $text, $this );
 335
 336                 $text = $this->mStripState->unstripNoWiki( $text );
 337
 338                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 339
 340 //!JF Move to its own function
 341
 342                 $uniq_prefix = $this->mUniqPrefix;
 343                 $matches = array();
 344                 $elements = array_keys( $this->mTransparentTagHooks );
 345                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 346
 347                 foreach( $matches as $marker => $data ) {
 348                         list( $element, $content, $params, $tag ) = $data;
 349                         $tagName = strtolower( $element );
 350                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 351                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 352                                         array( $content, $params, $this ) );
 353                         } else {
 354                                 $output = $tag;
 355                         }
 356                         $this->mStripState->general->setPair( $marker, $output );
 357                 }
 358                 $text = $this->mStripState->unstripGeneral( $text );
 359
 360                 $text = Sanitizer::normalizeCharReferences( $text );
 361
 362                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 363                         $text = Parser::tidy($text);
 364                 } else {
 365                         # attempt to sanitize at least some nesting problems
 366                         # (bug #2702 and quite a few others)
 367                         $tidyregs = array(
 368                                 # ''Something [http://www.cool.com cool''] -->
 369                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 370                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 371                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 372                                 # fix up an anchor inside another anchor, only
 373                                 # at least for a single single nested link (bug 3695)
 374                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 375                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 376                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 377                                 # contains a div, so fix it up here; replace
 378                                 # div with escaped text
 379                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 380                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 381                                 # remove empty italic or bold tag pairs, some
 382                                 # introduced by rules above
 383                                 '/<([bi])><\/\\1>/' => '',
 384                         );
 385
 386                         $text = preg_replace(
 387                                 array_keys( $tidyregs ),
 388                                 array_values( $tidyregs ),
 389                                 $text );
 390                 }
 391
 392                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 393
 394                 # Information on include size limits, for the benefit of users who try to skirt them
 395                 if ( $this->mOptions->getEnableLimitReport() ) {
 396                         $max = $this->mOptions->getMaxIncludeSize();
 397                         $limitReport =
 398                                 "NewPP limit report\n" .
 399                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 400                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 401                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 402                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 403                         $text .= "\n<!-- \n$limitReport-->\n";
 404                 }
 405                 $this->mOutput->setText( $text );
 406                 $this->mRevisionId = $oldRevisionId;
 407                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 408                 wfProfileOut( $fname );
 409                 wfProfileOut( __METHOD__ );
 410
 411                 return $this->mOutput;
 412         }
 413
 414         /**
 415          * Recursive parser entry point that can be called from an extension tag
 416          * hook.
 417          */
 418         function recursiveTagParse( $text ) {
 419                 wfProfileIn( __METHOD__ );
 420                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 421                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 422                 $text = $this->internalParse( $text );
 423                 wfProfileOut( __METHOD__ );
 424                 return $text;
 425         }
 426
 427         /**
 428          * Expand templates and variables in the text, producing valid, static wikitext.
 429          * Also removes comments.
 430          */
 431         function preprocess( $text, $title, $options, $revid = null ) {
 432                 wfProfileIn( __METHOD__ );
 433                 $this->clearState();
 434                 $this->setOutputType( self::OT_PREPROCESS );
 435                 $this->mOptions = $options;
 436                 $this->setTitle( $title );
 437                 if( $revid !== null ) {
 438                         $this->mRevisionId = $revid;
 439                 }
 440                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 441                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 442                 $text = $this->replaceVariables( $text );
 443                 $text = $this->mStripState->unstripBoth( $text );
 444                 wfProfileOut( __METHOD__ );
 445                 return $text;
 446         }
 447
 448         /**
 449          * Get a random string
 450          *
 451          * @private
 452          * @static
 453          */
 454         function getRandomString() {
 455                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 456         }
 457
 458         function &getTitle() { return $this->mTitle; }
 459         function getOptions() { return $this->mOptions; }
 460
 461         function getFunctionLang() {
 462                 global $wgLang, $wgContLang;
 463
 464                 $target = $this->mOptions->getTargetLanguage();
 465                 if ( $target !== null ) {
 466                         return $target;
 467                 } else {
 468                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 469                 }
 470         }
 471
 472         /**
 473          * Get a preprocessor object
 474          */
 475         function getPreprocessor() {
 476                 if ( !isset( $this->mPreprocessor ) ) {
 477                         $class = $this->mPreprocessorClass;
 478                         $this->mPreprocessor = new $class( $this );
 479                 }
 480                 return $this->mPreprocessor;
 481         }
 482
 483         /**
 484          * Replaces all occurrences of HTML-style comments and the given tags
 485          * in the text with a random marker and returns the next text. The output
 486          * parameter $matches will be an associative array filled with data in
 487          * the form:
 488          *   'UNIQ-xxxxx' => array(
 489          *     'element',
 490          *     'tag content',
 491          *     array( 'param' => 'x' ),
 492          *     '<element param="x">tag content</element>' ) )
 493          *
 494          * @param $elements list of element names. Comments are always extracted.
 495          * @param $text Source text string.
 496          * @param $uniq_prefix
 497          *
 498          * @public
 499          * @static
 500          */
 501         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 502                 static $n = 1;
 503                 $stripped = '';
 504                 $matches = array();
 505
 506                 $taglist = implode( '|', $elements );
 507                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 508
 509                 while ( '' != $text ) {
 510                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 511                         $stripped .= $p[0];
 512                         if( count( $p ) < 5 ) {
 513                                 break;
 514                         }
 515                         if( count( $p ) > 5 ) {
 516                                 // comment
 517                                 $element    = $p[4];
 518                                 $attributes = '';
 519                                 $close      = '';
 520                                 $inside     = $p[5];
 521                         } else {
 522                                 // tag
 523                                 $element    = $p[1];
 524                                 $attributes = $p[2];
 525                                 $close      = $p[3];
 526                                 $inside     = $p[4];
 527                         }
 528
 529                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
 530                         $stripped .= $marker;
 531
 532                         if ( $close === '/>' ) {
 533                                 // Empty element tag, <tag />
 534                                 $content = null;
 535                                 $text = $inside;
 536                                 $tail = null;
 537                         } else {
 538                                 if( $element == '!--' ) {
 539                                         $end = '/(-->)/';
 540                                 } else {
 541                                         $end = "/(<\\/$element\\s*>)/i";
 542                                 }
 543                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 544                                 $content = $q[0];
 545                                 if( count( $q ) < 3 ) {
 546                                         # No end tag -- let it run out to the end of the text.
 547                                         $tail = '';
 548                                         $text = '';
 549                                 } else {
 550                                         $tail = $q[1];
 551                                         $text = $q[2];
 552                                 }
 553                         }
 554
 555                         $matches[$marker] = array( $element,
 556                                 $content,
 557                                 Sanitizer::decodeTagAttributes( $attributes ),
 558                                 "<$element$attributes$close$content$tail" );
 559                 }
 560                 return $stripped;
 561         }
 562
 563         /**
 564          * Get a list of strippable XML-like elements
 565          */
 566         function getStripList() {
 567                 global $wgRawHtml;
 568                 $elements = $this->mStripList;
 569                 if( $wgRawHtml ) {
 570                         $elements[] = 'html';
 571                 }
 572                 if( $this->mOptions->getUseTeX() ) {
 573                         $elements[] = 'math';
 574                 }
 575                 return $elements;
 576         }
 577
 578         /**
 579          * @deprecated use replaceVariables
 580          */
 581         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 582                 return $text;
 583         }
 584
 585         /**
 586          * Restores pre, math, and other extensions removed by strip()
 587          *
 588          * always call unstripNoWiki() after this one
 589          * @private
 590          * @deprecated use $this->mStripState->unstrip()
 591          */
 592         function unstrip( $text, $state ) {
 593                 return $state->unstripGeneral( $text );
 594         }
 595
 596         /**
 597          * Always call this after unstrip() to preserve the order
 598          *
 599          * @private
 600          * @deprecated use $this->mStripState->unstrip()
 601          */
 602         function unstripNoWiki( $text, $state ) {
 603                 return $state->unstripNoWiki( $text );
 604         }
 605
 606         /**
 607          * @deprecated use $this->mStripState->unstripBoth()
 608          */
 609         function unstripForHTML( $text ) {
 610                 return $this->mStripState->unstripBoth( $text );
 611         }
 612
 613         /**
 614          * Add an item to the strip state
 615          * Returns the unique tag which must be inserted into the stripped text
 616          * The tag will be replaced with the original text in unstrip()
 617          *
 618          * @private
 619          */
 620         function insertStripItem( $text ) {
 621                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-{$this->mMarkerSuffix}";
 622                 $this->mMarkerIndex++;
 623                 $this->mStripState->general->setPair( $rnd, $text );
 624                 return $rnd;
 625         }
 626
 627         /**
 628          * Interface with html tidy, used if $wgUseTidy = true.
 629          * If tidy isn't able to correct the markup, the original will be
 630          * returned in all its glory with a warning comment appended.
 631          *
 632          * Either the external tidy program or the in-process tidy extension
 633          * will be used depending on availability. Override the default
 634          * $wgTidyInternal setting to disable the internal if it's not working.
 635          *
 636          * @param string $text Hideous HTML input
 637          * @return string Corrected HTML output
 638          * @public
 639          * @static
 640          */
 641         function tidy( $text ) {
 642                 global $wgTidyInternal;
 643                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 644 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 645 '<head><title>test</title></head><body>'.$text.'</body></html>';
 646                 if( $wgTidyInternal ) {
 647                         $correctedtext = Parser::internalTidy( $wrappedtext );
 648                 } else {
 649                         $correctedtext = Parser::externalTidy( $wrappedtext );
 650                 }
 651                 if( is_null( $correctedtext ) ) {
 652                         wfDebug( "Tidy error detected!\n" );
 653                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 654                 }
 655                 return $correctedtext;
 656         }
 657
 658         /**
 659          * Spawn an external HTML tidy process and get corrected markup back from it.
 660          *
 661          * @private
 662          * @static
 663          */
 664         function externalTidy( $text ) {
 665                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 666                 $fname = 'Parser::externalTidy';
 667                 wfProfileIn( $fname );
 668
 669                 $cleansource = '';
 670                 $opts = ' -utf8';
 671
 672                 $descriptorspec = array(
 673                         0 => array('pipe', 'r'),
 674                         1 => array('pipe', 'w'),
 675                         2 => array('file', wfGetNull(), 'a')
 676                 );
 677                 $pipes = array();
 678                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 679                 if (is_resource($process)) {
 680                         // Theoretically, this style of communication could cause a deadlock
 681                         // here. If the stdout buffer fills up, then writes to stdin could
 682                         // block. This doesn't appear to happen with tidy, because tidy only
 683                         // writes to stdout after it's finished reading from stdin. Search
 684                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 685                         fwrite($pipes[0], $text);
 686                         fclose($pipes[0]);
 687                         while (!feof($pipes[1])) {
 688                                 $cleansource .= fgets($pipes[1], 1024);
 689                         }
 690                         fclose($pipes[1]);
 691                         proc_close($process);
 692                 }
 693
 694                 wfProfileOut( $fname );
 695
 696                 if( $cleansource == '' && $text != '') {
 697                         // Some kind of error happened, so we couldn't get the corrected text.
 698                         // Just give up; we'll use the source text and append a warning.
 699                         return null;
 700                 } else {
 701                         return $cleansource;
 702                 }
 703         }
 704
 705         /**
 706          * Use the HTML tidy PECL extension to use the tidy library in-process,
 707          * saving the overhead of spawning a new process.
 708          *
 709          * 'pear install tidy' should be able to compile the extension module.
 710          *
 711          * @private
 712          * @static
 713          */
 714         function internalTidy( $text ) {
 715                 global $wgTidyConf, $IP, $wgDebugTidy;
 716                 $fname = 'Parser::internalTidy';
 717                 wfProfileIn( $fname );
 718
 719                 $tidy = new tidy;
 720                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 721                 $tidy->cleanRepair();
 722                 if( $tidy->getStatus() == 2 ) {
 723                         // 2 is magic number for fatal error
 724                         // http://www.php.net/manual/en/function.tidy-get-status.php
 725                         $cleansource = null;
 726                 } else {
 727                         $cleansource = tidy_get_output( $tidy );
 728                 }
 729                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 730                         $cleansource .= "<!--\nTidy reports:\n" .
 731                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 732                                 "\n-->";
 733                 }
 734
 735                 wfProfileOut( $fname );
 736                 return $cleansource;
 737         }
 738
 739         /**
 740          * parse the wiki syntax used to render tables
 741          *
 742          * @private
 743          */
 744         function doTableStuff ( $text ) {
 745                 $fname = 'Parser::doTableStuff';
 746                 wfProfileIn( $fname );
 747
 748                 $lines = explode ( "\n" , $text );
 749                 $td_history = array (); // Is currently a td tag open?
 750                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 751                 $tr_history = array (); // Is currently a tr tag open?
 752                 $tr_attributes = array (); // history of tr attributes
 753                 $has_opened_tr = array(); // Did this table open a <tr> element?
 754                 $indent_level = 0; // indent level of the table
 755                 foreach ( $lines as $key => $line )
 756                 {
 757                         $line = trim ( $line );
 758
 759                         if( $line == '' ) { // empty line, go to next line
 760                                 continue;
 761                         }
 762                         $first_character = $line{0};
 763                         $matches = array();
 764
 765                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 766                                 // First check if we are starting a new table
 767                                 $indent_level = strlen( $matches[1] );
 768
 769                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 770                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 771
 772                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 773                                 array_push ( $td_history , false );
 774                                 array_push ( $last_tag_history , '' );
 775                                 array_push ( $tr_history , false );
 776                                 array_push ( $tr_attributes , '' );
 777                                 array_push ( $has_opened_tr , false );
 778                         } else if ( count ( $td_history ) == 0 ) {
 779                                 // Don't do any of the following
 780                                 continue;
 781                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 782                                 // We are ending a table
 783                                 $line = '</table>' . substr ( $line , 2 );
 784                                 $last_tag = array_pop ( $last_tag_history );
 785
 786                                 if ( !array_pop ( $has_opened_tr ) ) {
 787                                         $line = "<tr><td></td></tr>{$line}";
 788                                 }
 789
 790                                 if ( array_pop ( $tr_history ) ) {
 791                                         $line = "</tr>{$line}";
 792                                 }
 793
 794                                 if ( array_pop ( $td_history ) ) {
 795                                         $line = "</{$last_tag}>{$line}";
 796                                 }
 797                                 array_pop ( $tr_attributes );
 798                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 799                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 800                                 // Now we have a table row
 801                                 $line = preg_replace( '#^\|-+#', '', $line );
 802
 803                                 // Whats after the tag is now only attributes
 804                                 $attributes = $this->mStripState->unstripBoth( $line );
 805                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 806                                 array_pop ( $tr_attributes );
 807                                 array_push ( $tr_attributes , $attributes );
 808
 809                                 $line = '';
 810                                 $last_tag = array_pop ( $last_tag_history );
 811                                 array_pop ( $has_opened_tr );
 812                                 array_push ( $has_opened_tr , true );
 813
 814                                 if ( array_pop ( $tr_history ) ) {
 815                                         $line = '</tr>';
 816                                 }
 817
 818                                 if ( array_pop ( $td_history ) ) {
 819                                         $line = "</{$last_tag}>{$line}";
 820                                 }
 821
 822                                 $lines[$key] = $line;
 823                                 array_push ( $tr_history , false );
 824                                 array_push ( $td_history , false );
 825                                 array_push ( $last_tag_history , '' );
 826                         }
 827                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 828                                 // This might be cell elements, td, th or captions
 829                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 830                                         $first_character = '+';
 831                                         $line = substr ( $line , 1 );
 832                                 }
 833
 834                                 $line = substr ( $line , 1 );
 835
 836                                 if ( $first_character == '!' ) {
 837                                         $line = str_replace ( '!!' , '||' , $line );
 838                                 }
 839
 840                                 // Split up multiple cells on the same line.
 841                                 // FIXME : This can result in improper nesting of tags processed
 842                                 // by earlier parser steps, but should avoid splitting up eg
 843                                 // attribute values containing literal "||".
 844                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 845
 846                                 $lines[$key] = '';
 847
 848                                 // Loop through each table cell
 849                                 foreach ( $cells as $cell )
 850                                 {
 851                                         $previous = '';
 852                                         if ( $first_character != '+' )
 853                                         {
 854                                                 $tr_after = array_pop ( $tr_attributes );
 855                                                 if ( !array_pop ( $tr_history ) ) {
 856                                                         $previous = "<tr{$tr_after}>\n";
 857                                                 }
 858                                                 array_push ( $tr_history , true );
 859                                                 array_push ( $tr_attributes , '' );
 860                                                 array_pop ( $has_opened_tr );
 861                                                 array_push ( $has_opened_tr , true );
 862                                         }
 863
 864                                         $last_tag = array_pop ( $last_tag_history );
 865
 866                                         if ( array_pop ( $td_history ) ) {
 867                                                 $previous = "</{$last_tag}>{$previous}";
 868                                         }
 869
 870                                         if ( $first_character == '|' ) {
 871                                                 $last_tag = 'td';
 872                                         } else if ( $first_character == '!' ) {
 873                                                 $last_tag = 'th';
 874                                         } else if ( $first_character == '+' ) {
 875                                                 $last_tag = 'caption';
 876                                         } else {
 877                                                 $last_tag = '';
 878                                         }
 879
 880                                         array_push ( $last_tag_history , $last_tag );
 881
 882                                         // A cell could contain both parameters and data
 883                                         $cell_data = explode ( '|' , $cell , 2 );
 884
 885                                         // Bug 553: Note that a '|' inside an invalid link should not
 886                                         // be mistaken as delimiting cell parameters
 887                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 888                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 889                                         } else if ( count ( $cell_data ) == 1 )
 890                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 891                                         else {
 892                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 893                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 894                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 895                                         }
 896
 897                                         $lines[$key] .= $cell;
 898                                         array_push ( $td_history , true );
 899                                 }
 900                         }
 901                 }
 902
 903                 // Closing open td, tr && table
 904                 while ( count ( $td_history ) > 0 )
 905                 {
 906                         if ( array_pop ( $td_history ) ) {
 907                                 $lines[] = '</td>' ;
 908                         }
 909                         if ( array_pop ( $tr_history ) ) {
 910                                 $lines[] = '</tr>' ;
 911                         }
 912                         if ( !array_pop ( $has_opened_tr ) ) {
 913                                 $lines[] = "<tr><td></td></tr>" ;
 914                         }
 915
 916                         $lines[] = '</table>' ;
 917                 }
 918
 919                 $output = implode ( "\n" , $lines ) ;
 920
 921                 // special case: don't return empty table
 922                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 923                         $output = '';
 924                 }
 925
 926                 wfProfileOut( $fname );
 927
 928                 return $output;
 929         }
 930
 931         /**
 932          * Helper function for parse() that transforms wiki markup into
 933          * HTML. Only called for $mOutputType == self::OT_HTML.
 934          *
 935          * @private
 936          */
 937         function internalParse( $text ) {
 938                 $isMain = true;
 939                 $fname = 'Parser::internalParse';
 940                 wfProfileIn( $fname );
 941
 942                 # Hook to suspend the parser in this state
 943                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 944                         wfProfileOut( $fname );
 945                         return $text ;
 946                 }
 947
 948                 $text = $this->replaceVariables( $text );
 949                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 950                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 951
 952                 // Tables need to come after variable replacement for things to work
 953                 // properly; putting them before other transformations should keep
 954                 // exciting things like link expansions from showing up in surprising
 955                 // places.
 956                 $text = $this->doTableStuff( $text );
 957
 958                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 959
 960                 $text = $this->doDoubleUnderscore( $text );
 961                 $text = $this->doHeadings( $text );
 962                 if($this->mOptions->getUseDynamicDates()) {
 963                         $df =& DateFormatter::getInstance();
 964                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 965                 }
 966                 $text = $this->doAllQuotes( $text );
 967                 $text = $this->replaceInternalLinks( $text );
 968                 $text = $this->replaceExternalLinks( $text );
 969
 970                 # replaceInternalLinks may sometimes leave behind
 971                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 972                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 973
 974                 $text = $this->doMagicLinks( $text );
 975                 $text = $this->formatHeadings( $text, $isMain );
 976
 977                 wfProfileOut( $fname );
 978                 return $text;
 979         }
 980
 981         /**
 982          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 983          * magic external links.
 984          *
 985          * @private
 986          */
 987         function doMagicLinks( $text ) {
 988                 wfProfileIn( __METHOD__ );
 989                 $text = preg_replace_callback(
 990                         '!(?:                           # Start cases
 991                             <a.*?</a> |                 # Skip link text
 992                             <.*?> |                     # Skip stuff inside HTML elements
 993                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
 994                             ISBN\s+(\b                  # ISBN, capture number as m[2]
 995                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 996                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 997                                      [0-9Xx]                 # check digit
 998                                    \b)
 999                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1000                 wfProfileOut( __METHOD__ );
1001                 return $text;
1002         }
1003
1004         function magicLinkCallback( $m ) {
1005                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1006                         # Skip HTML element
1007                         return $m[0];
1008                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1009                         $isbn = $m[2];
1010                         $num = strtr( $isbn, array(
1011                                 '-' => '',
1012                                 ' ' => '',
1013                                 'x' => 'X',
1014                         ));
1015                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1016                         $text = '<a href="' .
1017                                 $titleObj->escapeLocalUrl() .
1018                                 "\" class=\"internal\">ISBN $isbn</a>";
1019                 } else {
1020                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1021                                 $keyword = 'RFC';
1022                                 $urlmsg = 'rfcurl';
1023                                 $id = $m[1];
1024                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1025                                 $keyword = 'PMID';
1026                                 $urlmsg = 'pubmedurl';
1027                                 $id = $m[1];
1028                         } else {
1029                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1030                                         substr($m[0], 0, 20 ) . '"' );
1031                         }
1032
1033                         $url = wfMsg( $urlmsg, $id);
1034                         $sk = $this->mOptions->getSkin();
1035                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1036                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1037                 }
1038                 return $text;
1039         }
1040
1041         /**
1042          * Parse headers and return html
1043          *
1044          * @private
1045          */
1046         function doHeadings( $text ) {
1047                 $fname = 'Parser::doHeadings';
1048                 wfProfileIn( $fname );
1049                 for ( $i = 6; $i >= 1; --$i ) {
1050                         $h = str_repeat( '=', $i );
1051                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1052                           "<h$i>\\1</h$i>", $text );
1053                 }
1054                 wfProfileOut( $fname );
1055                 return $text;
1056         }
1057
1058         /**
1059          * Replace single quotes with HTML markup
1060          * @private
1061          * @return string the altered text
1062          */
1063         function doAllQuotes( $text ) {
1064                 $fname = 'Parser::doAllQuotes';
1065                 wfProfileIn( $fname );
1066                 $outtext = '';
1067                 $lines = explode( "\n", $text );
1068                 foreach ( $lines as $line ) {
1069                         $outtext .= $this->doQuotes ( $line ) . "\n";
1070                 }
1071                 $outtext = substr($outtext, 0,-1);
1072                 wfProfileOut( $fname );
1073                 return $outtext;
1074         }
1075
1076         /**
1077          * Helper function for doAllQuotes()
1078          */
1079         public function doQuotes( $text ) {
1080                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1081                 if ( count( $arr ) == 1 )
1082                         return $text;
1083                 else
1084                 {
1085                         # First, do some preliminary work. This may shift some apostrophes from
1086                         # being mark-up to being text. It also counts the number of occurrences
1087                         # of bold and italics mark-ups.
1088                         $i = 0;
1089                         $numbold = 0;
1090                         $numitalics = 0;
1091                         foreach ( $arr as $r )
1092                         {
1093                                 if ( ( $i % 2 ) == 1 )
1094                                 {
1095                                         # If there are ever four apostrophes, assume the first is supposed to
1096                                         # be text, and the remaining three constitute mark-up for bold text.
1097                                         if ( strlen( $arr[$i] ) == 4 )
1098                                         {
1099                                                 $arr[$i-1] .= "'";
1100                                                 $arr[$i] = "'''";
1101                                         }
1102                                         # If there are more than 5 apostrophes in a row, assume they're all
1103                                         # text except for the last 5.
1104                                         else if ( strlen( $arr[$i] ) > 5 )
1105                                         {
1106                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1107                                                 $arr[$i] = "'''''";
1108                                         }
1109                                         # Count the number of occurrences of bold and italics mark-ups.
1110                                         # We are not counting sequences of five apostrophes.
1111                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1112                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1113                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1114                                 }
1115                                 $i++;
1116                         }
1117
1118                         # If there is an odd number of both bold and italics, it is likely
1119                         # that one of the bold ones was meant to be an apostrophe followed
1120                         # by italics. Which one we cannot know for certain, but it is more
1121                         # likely to be one that has a single-letter word before it.
1122                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1123                         {
1124                                 $i = 0;
1125                                 $firstsingleletterword = -1;
1126                                 $firstmultiletterword = -1;
1127                                 $firstspace = -1;
1128                                 foreach ( $arr as $r )
1129                                 {
1130                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1131                                         {
1132                                                 $x1 = substr ($arr[$i-1], -1);
1133                                                 $x2 = substr ($arr[$i-1], -2, 1);
1134                                                 if ($x1 == ' ') {
1135                                                         if ($firstspace == -1) $firstspace = $i;
1136                                                 } else if ($x2 == ' ') {
1137                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1138                                                 } else {
1139                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1140                                                 }
1141                                         }
1142                                         $i++;
1143                                 }
1144
1145                                 # If there is a single-letter word, use it!
1146                                 if ($firstsingleletterword > -1)
1147                                 {
1148                                         $arr [ $firstsingleletterword ] = "''";
1149                                         $arr [ $firstsingleletterword-1 ] .= "'";
1150                                 }
1151                                 # If not, but there's a multi-letter word, use that one.
1152                                 else if ($firstmultiletterword > -1)
1153                                 {
1154                                         $arr [ $firstmultiletterword ] = "''";
1155                                         $arr [ $firstmultiletterword-1 ] .= "'";
1156                                 }
1157                                 # ... otherwise use the first one that has neither.
1158                                 # (notice that it is possible for all three to be -1 if, for example,
1159                                 # there is only one pentuple-apostrophe in the line)
1160                                 else if ($firstspace > -1)
1161                                 {
1162                                         $arr [ $firstspace ] = "''";
1163                                         $arr [ $firstspace-1 ] .= "'";
1164                                 }
1165                         }
1166
1167                         # Now let's actually convert our apostrophic mush to HTML!
1168                         $output = '';
1169                         $buffer = '';
1170                         $state = '';
1171                         $i = 0;
1172                         foreach ($arr as $r)
1173                         {
1174                                 if (($i % 2) == 0)
1175                                 {
1176                                         if ($state == 'both')
1177                                                 $buffer .= $r;
1178                                         else
1179                                                 $output .= $r;
1180                                 }
1181                                 else
1182                                 {
1183                                         if (strlen ($r) == 2)
1184                                         {
1185                                                 if ($state == 'i')
1186                                                 { $output .= '</i>'; $state = ''; }
1187                                                 else if ($state == 'bi')
1188                                                 { $output .= '</i>'; $state = 'b'; }
1189                                                 else if ($state == 'ib')
1190                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1191                                                 else if ($state == 'both')
1192                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1193                                                 else # $state can be 'b' or ''
1194                                                 { $output .= '<i>'; $state .= 'i'; }
1195                                         }
1196                                         else if (strlen ($r) == 3)
1197                                         {
1198                                                 if ($state == 'b')
1199                                                 { $output .= '</b>'; $state = ''; }
1200                                                 else if ($state == 'bi')
1201                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1202                                                 else if ($state == 'ib')
1203                                                 { $output .= '</b>'; $state = 'i'; }
1204                                                 else if ($state == 'both')
1205                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1206                                                 else # $state can be 'i' or ''
1207                                                 { $output .= '<b>'; $state .= 'b'; }
1208                                         }
1209                                         else if (strlen ($r) == 5)
1210                                         {
1211                                                 if ($state == 'b')
1212                                                 { $output .= '</b><i>'; $state = 'i'; }
1213                                                 else if ($state == 'i')
1214                                                 { $output .= '</i><b>'; $state = 'b'; }
1215                                                 else if ($state == 'bi')
1216                                                 { $output .= '</i></b>'; $state = ''; }
1217                                                 else if ($state == 'ib')
1218                                                 { $output .= '</b></i>'; $state = ''; }
1219                                                 else if ($state == 'both')
1220                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1221                                                 else # ($state == '')
1222                                                 { $buffer = ''; $state = 'both'; }
1223                                         }
1224                                 }
1225                                 $i++;
1226                         }
1227                         # Now close all remaining tags.  Notice that the order is important.
1228                         if ($state == 'b' || $state == 'ib')
1229                                 $output .= '</b>';
1230                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1231                                 $output .= '</i>';
1232                         if ($state == 'bi')
1233                                 $output .= '</b>';
1234                         # There might be lonely ''''', so make sure we have a buffer
1235                         if ($state == 'both' && $buffer)
1236                                 $output .= '<b><i>'.$buffer.'</i></b>';
1237                         return $output;
1238                 }
1239         }
1240
1241         /**
1242          * Replace external links
1243          *
1244          * Note: this is all very hackish and the order of execution matters a lot.
1245          * Make sure to run maintenance/parserTests.php if you change this code.
1246          *
1247          * @private
1248          */
1249         function replaceExternalLinks( $text ) {
1250                 global $wgContLang;
1251                 $fname = 'Parser::replaceExternalLinks';
1252                 wfProfileIn( $fname );
1253
1254                 $sk = $this->mOptions->getSkin();
1255
1256                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1257
1258                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1259
1260                 $i = 0;
1261                 while ( $i<count( $bits ) ) {
1262                         $url = $bits[$i++];
1263                         $protocol = $bits[$i++];
1264                         $text = $bits[$i++];
1265                         $trail = $bits[$i++];
1266
1267                         # The characters '<' and '>' (which were escaped by
1268                         # removeHTMLtags()) should not be included in
1269                         # URLs, per RFC 2396.
1270                         $m2 = array();
1271                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1272                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1273                                 $url = substr($url, 0, $m2[0][1]);
1274                         }
1275
1276                         # If the link text is an image URL, replace it with an <img> tag
1277                         # This happened by accident in the original parser, but some people used it extensively
1278                         $img = $this->maybeMakeExternalImage( $text );
1279                         if ( $img !== false ) {
1280                                 $text = $img;
1281                         }
1282
1283                         $dtrail = '';
1284
1285                         # Set linktype for CSS - if URL==text, link is essentially free
1286                         $linktype = ($text == $url) ? 'free' : 'text';
1287
1288                         # No link text, e.g. [http://domain.tld/some.link]
1289                         if ( $text == '' ) {
1290                                 # Autonumber if allowed. See bug #5918
1291                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1292                                         $text = '[' . ++$this->mAutonumber . ']';
1293                                         $linktype = 'autonumber';
1294                                 } else {
1295                                         # Otherwise just use the URL
1296                                         $text = htmlspecialchars( $url );
1297                                         $linktype = 'free';
1298                                 }
1299                         } else {
1300                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1301                                 # Check for trail
1302                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1303                         }
1304
1305                         $text = $wgContLang->markNoConversion($text);
1306
1307                         $url = Sanitizer::cleanUrl( $url );
1308
1309                         # Process the trail (i.e. everything after this link up until start of the next link),
1310                         # replacing any non-bracketed links
1311                         $trail = $this->replaceFreeExternalLinks( $trail );
1312
1313                         # Use the encoded URL
1314                         # This means that users can paste URLs directly into the text
1315                         # Funny characters like &ouml; aren't valid in URLs anyway
1316                         # This was changed in August 2004
1317                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1318
1319                         # Register link in the output object.
1320                         # Replace unnecessary URL escape codes with the referenced character
1321                         # This prevents spammers from hiding links from the filters
1322                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1323                         $this->mOutput->addExternalLink( $pasteurized );
1324                 }
1325
1326                 wfProfileOut( $fname );
1327                 return $s;
1328         }
1329
1330         /**
1331          * Replace anything that looks like a URL with a link
1332          * @private
1333          */
1334         function replaceFreeExternalLinks( $text ) {
1335                 global $wgContLang;
1336                 $fname = 'Parser::replaceFreeExternalLinks';
1337                 wfProfileIn( $fname );
1338
1339                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1340                 $s = array_shift( $bits );
1341                 $i = 0;
1342
1343                 $sk = $this->mOptions->getSkin();
1344
1345                 while ( $i < count( $bits ) ){
1346                         $protocol = $bits[$i++];
1347                         $remainder = $bits[$i++];
1348
1349                         $m = array();
1350                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1351                                 # Found some characters after the protocol that look promising
1352                                 $url = $protocol . $m[1];
1353                                 $trail = $m[2];
1354
1355                                 # special case: handle urls as url args:
1356                                 # http://www.example.com/foo?=http://www.example.com/bar
1357                                 if(strlen($trail) == 0 &&
1358                                         isset($bits[$i]) &&
1359                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1360                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1361                                 {
1362                                         # add protocol, arg
1363                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1364                                         $i += 2;
1365                                         $trail = $m[2];
1366                                 }
1367
1368                                 # The characters '<' and '>' (which were escaped by
1369                                 # removeHTMLtags()) should not be included in
1370                                 # URLs, per RFC 2396.
1371                                 $m2 = array();
1372                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1373                                         $trail = substr($url, $m2[0][1]) . $trail;
1374                                         $url = substr($url, 0, $m2[0][1]);
1375                                 }
1376
1377                                 # Move trailing punctuation to $trail
1378                                 $sep = ',;\.:!?';
1379                                 # If there is no left bracket, then consider right brackets fair game too
1380                                 if ( strpos( $url, '(' ) === false ) {
1381                                         $sep .= ')';
1382                                 }
1383
1384                                 $numSepChars = strspn( strrev( $url ), $sep );
1385                                 if ( $numSepChars ) {
1386                                         $trail = substr( $url, -$numSepChars ) . $trail;
1387                                         $url = substr( $url, 0, -$numSepChars );
1388                                 }
1389
1390                                 $url = Sanitizer::cleanUrl( $url );
1391
1392                                 # Is this an external image?
1393                                 $text = $this->maybeMakeExternalImage( $url );
1394                                 if ( $text === false ) {
1395                                         # Not an image, make a link
1396                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1397                                         # Register it in the output object...
1398                                         # Replace unnecessary URL escape codes with their equivalent characters
1399                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1400                                         $this->mOutput->addExternalLink( $pasteurized );
1401                                 }
1402                                 $s .= $text . $trail;
1403                         } else {
1404                                 $s .= $protocol . $remainder;
1405                         }
1406                 }
1407                 wfProfileOut( $fname );
1408                 return $s;
1409         }
1410
1411         /**
1412          * Replace unusual URL escape codes with their equivalent characters
1413          * @param string
1414          * @return string
1415          * @static
1416          * @todo  This can merge genuinely required bits in the path or query string,
1417          *        breaking legit URLs. A proper fix would treat the various parts of
1418          *        the URL differently; as a workaround, just use the output for
1419          *        statistical records, not for actual linking/output.
1420          */
1421         static function replaceUnusualEscapes( $url ) {
1422                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1423                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1424         }
1425
1426         /**
1427          * Callback function used in replaceUnusualEscapes().
1428          * Replaces unusual URL escape codes with their equivalent character
1429          * @static
1430          * @private
1431          */
1432         private static function replaceUnusualEscapesCallback( $matches ) {
1433                 $char = urldecode( $matches[0] );
1434                 $ord = ord( $char );
1435                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1436                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1437                         // No, shouldn't be escaped
1438                         return $char;
1439                 } else {
1440                         // Yes, leave it escaped
1441                         return $matches[0];
1442                 }
1443         }
1444
1445         /**
1446          * make an image if it's allowed, either through the global
1447          * option or through the exception
1448          * @private
1449          */
1450         function maybeMakeExternalImage( $url ) {
1451                 $sk = $this->mOptions->getSkin();
1452                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1453                 $imagesexception = !empty($imagesfrom);
1454                 $text = false;
1455                 if ( $this->mOptions->getAllowExternalImages()
1456                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1457                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1458                                 # Image found
1459                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1460                         }
1461                 }
1462                 return $text;
1463         }
1464
1465         /**
1466          * Process [[ ]] wikilinks
1467          *
1468          * @private
1469          */
1470         function replaceInternalLinks( $s ) {
1471                 global $wgContLang;
1472                 static $fname = 'Parser::replaceInternalLinks' ;
1473
1474                 wfProfileIn( $fname );
1475
1476                 wfProfileIn( $fname.'-setup' );
1477                 static $tc = FALSE;
1478                 # the % is needed to support urlencoded titles as well
1479                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1480
1481                 $sk = $this->mOptions->getSkin();
1482
1483                 #split the entire text string on occurences of [[
1484                 $a = explode( '[[', ' ' . $s );
1485                 #get the first element (all text up to first [[), and remove the space we added
1486                 $s = array_shift( $a );
1487                 $s = substr( $s, 1 );
1488
1489                 # Match a link having the form [[namespace:link|alternate]]trail
1490                 static $e1 = FALSE;
1491                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1492                 # Match cases where there is no "]]", which might still be images
1493                 static $e1_img = FALSE;
1494                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1495
1496                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1497                 $e2 = null;
1498                 if ( $useLinkPrefixExtension ) {
1499                         # Match the end of a line for a word that's not followed by whitespace,
1500                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1501                         $e2 = wfMsgForContent( 'linkprefix' );
1502                 }
1503
1504                 if( is_null( $this->mTitle ) ) {
1505                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1506                 }
1507                 $nottalk = !$this->mTitle->isTalkPage();
1508
1509                 if ( $useLinkPrefixExtension ) {
1510                         $m = array();
1511                         if ( preg_match( $e2, $s, $m ) ) {
1512                                 $first_prefix = $m[2];
1513                         } else {
1514                                 $first_prefix = false;
1515                         }
1516                 } else {
1517                         $prefix = '';
1518                 }
1519
1520                 if($wgContLang->hasVariants()) {
1521                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1522                 } else {
1523                         $selflink = array($this->mTitle->getPrefixedText());
1524                 }
1525                 $useSubpages = $this->areSubpagesAllowed();
1526                 wfProfileOut( $fname.'-setup' );
1527
1528                 # Loop for each link
1529                 for ($k = 0; isset( $a[$k] ); $k++) {
1530                         $line = $a[$k];
1531                         if ( $useLinkPrefixExtension ) {
1532                                 wfProfileIn( $fname.'-prefixhandling' );
1533                                 if ( preg_match( $e2, $s, $m ) ) {
1534                                         $prefix = $m[2];
1535                                         $s = $m[1];
1536                                 } else {
1537                                         $prefix='';
1538                                 }
1539                                 # first link
1540                                 if($first_prefix) {
1541                                         $prefix = $first_prefix;
1542                                         $first_prefix = false;
1543                                 }
1544                                 wfProfileOut( $fname.'-prefixhandling' );
1545                         }
1546
1547                         $might_be_img = false;
1548
1549                         wfProfileIn( "$fname-e1" );
1550                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1551                                 $text = $m[2];
1552                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1553                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1554                                 # the real problem is with the $e1 regex
1555                                 # See bug 1300.
1556                                 #
1557                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1558                                 # and no image is in sight. See bug 2095.
1559                                 #
1560                                 if( $text !== '' &&
1561                                         substr( $m[3], 0, 1 ) === ']' &&
1562                                         strpos($text, '[') !== false
1563                                 )
1564                                 {
1565                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1566                                         $m[3] = substr( $m[3], 1 );
1567                                 }
1568                                 # fix up urlencoded title texts
1569                                 if( strpos( $m[1], '%' ) !== false ) {
1570                                         # Should anchors '#' also be rejected?
1571                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1572                                 }
1573                                 $trail = $m[3];
1574                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1575                                 $might_be_img = true;
1576                                 $text = $m[2];
1577                                 if ( strpos( $m[1], '%' ) !== false ) {
1578                                         $m[1] = urldecode($m[1]);
1579                                 }
1580                                 $trail = "";
1581                         } else { # Invalid form; output directly
1582                                 $s .= $prefix . '[[' . $line ;
1583                                 wfProfileOut( "$fname-e1" );
1584                                 continue;
1585                         }
1586                         wfProfileOut( "$fname-e1" );
1587                         wfProfileIn( "$fname-misc" );
1588
1589                         # Don't allow internal links to pages containing
1590                         # PROTO: where PROTO is a valid URL protocol; these
1591                         # should be external links.
1592                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1593                                 $s .= $prefix . '[[' . $line ;
1594                                 continue;
1595                         }
1596
1597                         # Make subpage if necessary
1598                         if( $useSubpages ) {
1599                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1600                         } else {
1601                                 $link = $m[1];
1602                         }
1603
1604                         $noforce = (substr($m[1], 0, 1) != ':');
1605                         if (!$noforce) {
1606                                 # Strip off leading ':'
1607                                 $link = substr($link, 1);
1608                         }
1609
1610                         wfProfileOut( "$fname-misc" );
1611                         wfProfileIn( "$fname-title" );
1612                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1613                         if( !$nt ) {
1614                                 $s .= $prefix . '[[' . $line;
1615                                 wfProfileOut( "$fname-title" );
1616                                 continue;
1617                         }
1618
1619                         $ns = $nt->getNamespace();
1620                         $iw = $nt->getInterWiki();
1621                         wfProfileOut( "$fname-title" );
1622
1623                         if ($might_be_img) { # if this is actually an invalid link
1624                                 wfProfileIn( "$fname-might_be_img" );
1625                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1626                                         $found = false;
1627                                         while (isset ($a[$k+1]) ) {
1628                                                 #look at the next 'line' to see if we can close it there
1629                                                 $spliced = array_splice( $a, $k + 1, 1 );
1630                                                 $next_line = array_shift( $spliced );
1631                                                 $m = explode( ']]', $next_line, 3 );
1632                                                 if ( count( $m ) == 3 ) {
1633                                                         # the first ]] closes the inner link, the second the image
1634                                                         $found = true;
1635                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1636                                                         $trail = $m[2];
1637                                                         break;
1638                                                 } elseif ( count( $m ) == 2 ) {
1639                                                         #if there's exactly one ]] that's fine, we'll keep looking
1640                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1641                                                 } else {
1642                                                         #if $next_line is invalid too, we need look no further
1643                                                         $text .= '[[' . $next_line;
1644                                                         break;
1645                                                 }
1646                                         }
1647                                         if ( !$found ) {
1648                                                 # we couldn't find the end of this imageLink, so output it raw
1649                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1650                                                 $text = $this->replaceInternalLinks($text);
1651                                                 $s .= "{$prefix}[[$link|$text";
1652                                                 # note: no $trail, because without an end, there *is* no trail
1653                                                 wfProfileOut( "$fname-might_be_img" );
1654                                                 continue;
1655                                         }
1656                                 } else { #it's not an image, so output it raw
1657                                         $s .= "{$prefix}[[$link|$text";
1658                                         # note: no $trail, because without an end, there *is* no trail
1659                                         wfProfileOut( "$fname-might_be_img" );
1660                                         continue;
1661                                 }
1662                                 wfProfileOut( "$fname-might_be_img" );
1663                         }
1664
1665                         $wasblank = ( '' == $text );
1666                         if( $wasblank ) $text = $link;
1667
1668                         # Link not escaped by : , create the various objects
1669                         if( $noforce ) {
1670
1671                                 # Interwikis
1672                                 wfProfileIn( "$fname-interwiki" );
1673                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1674                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1675                                         $s = rtrim($s . $prefix);
1676                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1677                                         wfProfileOut( "$fname-interwiki" );
1678                                         continue;
1679                                 }
1680                                 wfProfileOut( "$fname-interwiki" );
1681
1682                                 if ( $ns == NS_IMAGE ) {
1683                                         wfProfileIn( "$fname-image" );
1684                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1685                                                 # recursively parse links inside the image caption
1686                                                 # actually, this will parse them in any other parameters, too,
1687                                                 # but it might be hard to fix that, and it doesn't matter ATM
1688                                                 $text = $this->replaceExternalLinks($text);
1689                                                 $text = $this->replaceInternalLinks($text);
1690
1691                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1692                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1693                                                 $this->mOutput->addImage( $nt->getDBkey() );
1694
1695                                                 wfProfileOut( "$fname-image" );
1696                                                 continue;
1697                                         } else {
1698                                                 # We still need to record the image's presence on the page
1699                                                 $this->mOutput->addImage( $nt->getDBkey() );
1700                                         }
1701                                         wfProfileOut( "$fname-image" );
1702
1703                                 }
1704
1705                                 if ( $ns == NS_CATEGORY ) {
1706                                         wfProfileIn( "$fname-category" );
1707                                         $s = rtrim($s . "\n"); # bug 87
1708
1709                                         if ( $wasblank ) {
1710                                                 $sortkey = $this->getDefaultSort();
1711                                         } else {
1712                                                 $sortkey = $text;
1713                                         }
1714                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1715                                         $sortkey = str_replace( "\n", '', $sortkey );
1716                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1717                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1718
1719                                         /**
1720                                          * Strip the whitespace Category links produce, see bug 87
1721                                          * @todo We might want to use trim($tmp, "\n") here.
1722                                          */
1723                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1724
1725                                         wfProfileOut( "$fname-category" );
1726                                         continue;
1727                                 }
1728                         }
1729
1730                         # Self-link checking
1731                         if( $nt->getFragment() === '' ) {
1732                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1733                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1734                                         continue;
1735                                 }
1736                         }
1737
1738                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1739                         if( $ns == NS_MEDIA ) {
1740                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1741                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1742                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1743                                 $this->mOutput->addImage( $nt->getDBkey() );
1744                                 continue;
1745                         } elseif( $ns == NS_SPECIAL ) {
1746                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1747                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1748                                 } else {
1749                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1750                                 }
1751                                 continue;
1752                         } elseif( $ns == NS_IMAGE ) {
1753                                 $img = wfFindFile( $nt );
1754                                 if( $img ) {
1755                                         // Force a blue link if the file exists; may be a remote
1756                                         // upload on the shared repository, and we want to see its
1757                                         // auto-generated page.
1758                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1759                                         $this->mOutput->addLink( $nt );
1760                                         continue;
1761                                 }
1762                         }
1763                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1764                 }
1765                 wfProfileOut( $fname );
1766                 return $s;
1767         }
1768
1769         /**
1770          * Make a link placeholder. The text returned can be later resolved to a real link with
1771          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1772          * parsing of interwiki links, and secondly to allow all existence checks and
1773          * article length checks (for stub links) to be bundled into a single query.
1774          *
1775          */
1776         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1777                 wfProfileIn( __METHOD__ );
1778                 if ( ! is_object($nt) ) {
1779                         # Fail gracefully
1780                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1781                 } else {
1782                         # Separate the link trail from the rest of the link
1783                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1784
1785                         if ( $nt->isExternal() ) {
1786                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1787                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1788                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1789                         } else {
1790                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1791                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1792                                 $this->mLinkHolders['queries'][] = $query;
1793                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1794                                 $this->mLinkHolders['titles'][] = $nt;
1795
1796                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1797                         }
1798                 }
1799                 wfProfileOut( __METHOD__ );
1800                 return $retVal;
1801         }
1802
1803         /**
1804          * Render a forced-blue link inline; protect against double expansion of
1805          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1806          * Since this little disaster has to split off the trail text to avoid
1807          * breaking URLs in the following text without breaking trails on the
1808          * wiki links, it's been made into a horrible function.
1809          *
1810          * @param Title $nt
1811          * @param string $text
1812          * @param string $query
1813          * @param string $trail
1814          * @param string $prefix
1815          * @return string HTML-wikitext mix oh yuck
1816          */
1817         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1818                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1819                 $sk = $this->mOptions->getSkin();
1820                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1821                 return $this->armorLinks( $link ) . $trail;
1822         }
1823
1824         /**
1825          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1826          * going to go through further parsing steps before inline URL expansion.
1827          *
1828          * In particular this is important when using action=render, which causes
1829          * full URLs to be included.
1830          *
1831          * Oh man I hate our multi-layer parser!
1832          *
1833          * @param string more-or-less HTML
1834          * @return string less-or-more HTML with NOPARSE bits
1835          */
1836         function armorLinks( $text ) {
1837                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1838                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1839         }
1840
1841         /**
1842          * Return true if subpage links should be expanded on this page.
1843          * @return bool
1844          */
1845         function areSubpagesAllowed() {
1846                 # Some namespaces don't allow subpages
1847                 global $wgNamespacesWithSubpages;
1848                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1849         }
1850
1851         /**
1852          * Handle link to subpage if necessary
1853          * @param string $target the source of the link
1854          * @param string &$text the link text, modified as necessary
1855          * @return string the full name of the link
1856          * @private
1857          */
1858         function maybeDoSubpageLink($target, &$text) {
1859                 # Valid link forms:
1860                 # Foobar -- normal
1861                 # :Foobar -- override special treatment of prefix (images, language links)
1862                 # /Foobar -- convert to CurrentPage/Foobar
1863                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1864                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1865                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1866
1867                 $fname = 'Parser::maybeDoSubpageLink';
1868                 wfProfileIn( $fname );
1869                 $ret = $target; # default return value is no change
1870
1871                 # Some namespaces don't allow subpages,
1872                 # so only perform processing if subpages are allowed
1873                 if( $this->areSubpagesAllowed() ) {
1874                         $hash = strpos( $target, '#' );
1875                         if( $hash !== false ) {
1876                                 $suffix = substr( $target, $hash );
1877                                 $target = substr( $target, 0, $hash );
1878                         } else {
1879                                 $suffix = '';
1880                         }
1881                         # bug 7425
1882                         $target = trim( $target );
1883                         # Look at the first character
1884                         if( $target != '' && $target{0} == '/' ) {
1885                                 # / at end means we don't want the slash to be shown
1886                                 $m = array();
1887                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1888                                 if( $trailingSlashes ) {
1889                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1890                                 } else {
1891                                         $noslash = substr( $target, 1 );
1892                                 }
1893
1894                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1895                                 if( '' === $text ) {
1896                                         $text = $target . $suffix;
1897                                 } # this might be changed for ugliness reasons
1898                         } else {
1899                                 # check for .. subpage backlinks
1900                                 $dotdotcount = 0;
1901                                 $nodotdot = $target;
1902                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1903                                         ++$dotdotcount;
1904                                         $nodotdot = substr( $nodotdot, 3 );
1905                                 }
1906                                 if($dotdotcount > 0) {
1907                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1908                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1909                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1910                                                 # / at the end means don't show full path
1911                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1912                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1913                                                         if( '' === $text ) {
1914                                                                 $text = $nodotdot . $suffix;
1915                                                         }
1916                                                 }
1917                                                 $nodotdot = trim( $nodotdot );
1918                                                 if( $nodotdot != '' ) {
1919                                                         $ret .= '/' . $nodotdot;
1920                                                 }
1921                                                 $ret .= $suffix;
1922                                         }
1923                                 }
1924                         }
1925                 }
1926
1927                 wfProfileOut( $fname );
1928                 return $ret;
1929         }
1930
1931         /**#@+
1932          * Used by doBlockLevels()
1933          * @private
1934          */
1935         /* private */ function closeParagraph() {
1936                 $result = '';
1937                 if ( '' != $this->mLastSection ) {
1938                         $result = '</' . $this->mLastSection  . ">\n";
1939                 }
1940                 $this->mInPre = false;
1941                 $this->mLastSection = '';
1942                 return $result;
1943         }
1944         # getCommon() returns the length of the longest common substring
1945         # of both arguments, starting at the beginning of both.
1946         #
1947         /* private */ function getCommon( $st1, $st2 ) {
1948                 $fl = strlen( $st1 );
1949                 $shorter = strlen( $st2 );
1950                 if ( $fl < $shorter ) { $shorter = $fl; }
1951
1952                 for ( $i = 0; $i < $shorter; ++$i ) {
1953                         if ( $st1{$i} != $st2{$i} ) { break; }
1954                 }
1955                 return $i;
1956         }
1957         # These next three functions open, continue, and close the list
1958         # element appropriate to the prefix character passed into them.
1959         #
1960         /* private */ function openList( $char ) {
1961                 $result = $this->closeParagraph();
1962
1963                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1964                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1965                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1966                 else if ( ';' == $char ) {
1967                         $result .= '<dl><dt>';
1968                         $this->mDTopen = true;
1969                 }
1970                 else { $result = '<!-- ERR 1 -->'; }
1971
1972                 return $result;
1973         }
1974
1975         /* private */ function nextItem( $char ) {
1976                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1977                 else if ( ':' == $char || ';' == $char ) {
1978                         $close = '</dd>';
1979                         if ( $this->mDTopen ) { $close = '</dt>'; }
1980                         if ( ';' == $char ) {
1981                                 $this->mDTopen = true;
1982                                 return $close . '<dt>';
1983                         } else {
1984                                 $this->mDTopen = false;
1985                                 return $close . '<dd>';
1986                         }
1987                 }
1988                 return '<!-- ERR 2 -->';
1989         }
1990
1991         /* private */ function closeList( $char ) {
1992                 if ( '*' == $char ) { $text = '</li></ul>'; }
1993                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1994                 else if ( ':' == $char ) {
1995                         if ( $this->mDTopen ) {
1996                                 $this->mDTopen = false;
1997                                 $text = '</dt></dl>';
1998                         } else {
1999                                 $text = '</dd></dl>';
2000                         }
2001                 }
2002                 else {  return '<!-- ERR 3 -->'; }
2003                 return $text."\n";
2004         }
2005         /**#@-*/
2006
2007         /**
2008          * Make lists from lines starting with ':', '*', '#', etc.
2009          *
2010          * @private
2011          * @return string the lists rendered as HTML
2012          */
2013         function doBlockLevels( $text, $linestart ) {
2014                 $fname = 'Parser::doBlockLevels';
2015                 wfProfileIn( $fname );
2016
2017                 # Parsing through the text line by line.  The main thing
2018                 # happening here is handling of block-level elements p, pre,
2019                 # and making lists from lines starting with * # : etc.
2020                 #
2021                 $textLines = explode( "\n", $text );
2022
2023                 $lastPrefix = $output = '';
2024                 $this->mDTopen = $inBlockElem = false;
2025                 $prefixLength = 0;
2026                 $paragraphStack = false;
2027
2028                 if ( !$linestart ) {
2029                         $output .= array_shift( $textLines );
2030                 }
2031                 foreach ( $textLines as $oLine ) {
2032                         $lastPrefixLength = strlen( $lastPrefix );
2033                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2034                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2035                         if ( !$this->mInPre ) {
2036                                 # Multiple prefixes may abut each other for nested lists.
2037                                 $prefixLength = strspn( $oLine, '*#:;' );
2038                                 $pref = substr( $oLine, 0, $prefixLength );
2039
2040                                 # eh?
2041                                 $pref2 = str_replace( ';', ':', $pref );
2042                                 $t = substr( $oLine, $prefixLength );
2043                                 $this->mInPre = !empty($preOpenMatch);
2044                         } else {
2045                                 # Don't interpret any other prefixes in preformatted text
2046                                 $prefixLength = 0;
2047                                 $pref = $pref2 = '';
2048                                 $t = $oLine;
2049                         }
2050
2051                         # List generation
2052                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2053                                 # Same as the last item, so no need to deal with nesting or opening stuff
2054                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2055                                 $paragraphStack = false;
2056
2057                                 if ( substr( $pref, -1 ) == ';') {
2058                                         # The one nasty exception: definition lists work like this:
2059                                         # ; title : definition text
2060                                         # So we check for : in the remainder text to split up the
2061                                         # title and definition, without b0rking links.
2062                                         $term = $t2 = '';
2063                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2064                                                 $t = $t2;
2065                                                 $output .= $term . $this->nextItem( ':' );
2066                                         }
2067                                 }
2068                         } elseif( $prefixLength || $lastPrefixLength ) {
2069                                 # Either open or close a level...
2070                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2071                                 $paragraphStack = false;
2072
2073                                 while( $commonPrefixLength < $lastPrefixLength ) {
2074                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2075                                         --$lastPrefixLength;
2076                                 }
2077                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2078                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2079                                 }
2080                                 while ( $prefixLength > $commonPrefixLength ) {
2081                                         $char = substr( $pref, $commonPrefixLength, 1 );
2082                                         $output .= $this->openList( $char );
2083
2084                                         if ( ';' == $char ) {
2085                                                 # FIXME: This is dupe of code above
2086                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2087                                                         $t = $t2;
2088                                                         $output .= $term . $this->nextItem( ':' );
2089                                                 }
2090                                         }
2091                                         ++$commonPrefixLength;
2092                                 }
2093                                 $lastPrefix = $pref2;
2094                         }
2095                         if( 0 == $prefixLength ) {
2096                                 wfProfileIn( "$fname-paragraph" );
2097                                 # No prefix (not in list)--go to paragraph mode
2098                                 // XXX: use a stack for nestable elements like span, table and div
2099                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2100                                 $closematch = preg_match(
2101                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2102                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2103                                 if ( $openmatch or $closematch ) {
2104                                         $paragraphStack = false;
2105                                         # TODO bug 5718: paragraph closed
2106                                         $output .= $this->closeParagraph();
2107                                         if ( $preOpenMatch and !$preCloseMatch ) {
2108                                                 $this->mInPre = true;
2109                                         }
2110                                         if ( $closematch ) {
2111                                                 $inBlockElem = false;
2112                                         } else {
2113                                                 $inBlockElem = true;
2114                                         }
2115                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2116                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2117                                                 // pre
2118                                                 if ($this->mLastSection != 'pre') {
2119                                                         $paragraphStack = false;
2120                                                         $output .= $this->closeParagraph().'<pre>';
2121                                                         $this->mLastSection = 'pre';
2122                                                 }
2123                                                 $t = substr( $t, 1 );
2124                                         } else {
2125                                                 // paragraph
2126                                                 if ( '' == trim($t) ) {
2127                                                         if ( $paragraphStack ) {
2128                                                                 $output .= $paragraphStack.'<br />';
2129                                                                 $paragraphStack = false;
2130                                                                 $this->mLastSection = 'p';
2131                                                         } else {
2132                                                                 if ($this->mLastSection != 'p' ) {
2133                                                                         $output .= $this->closeParagraph();
2134                                                                         $this->mLastSection = '';
2135                                                                         $paragraphStack = '<p>';
2136                                                                 } else {
2137                                                                         $paragraphStack = '</p><p>';
2138                                                                 }
2139                                                         }
2140                                                 } else {
2141                                                         if ( $paragraphStack ) {
2142                                                                 $output .= $paragraphStack;
2143                                                                 $paragraphStack = false;
2144                                                                 $this->mLastSection = 'p';
2145                                                         } else if ($this->mLastSection != 'p') {
2146                                                                 $output .= $this->closeParagraph().'<p>';
2147                                                                 $this->mLastSection = 'p';
2148                                                         }
2149                                                 }
2150                                         }
2151                                 }
2152                                 wfProfileOut( "$fname-paragraph" );
2153                         }
2154                         // somewhere above we forget to get out of pre block (bug 785)
2155                         if($preCloseMatch && $this->mInPre) {
2156                                 $this->mInPre = false;
2157                         }
2158                         if ($paragraphStack === false) {
2159                                 $output .= $t."\n";
2160                         }
2161                 }
2162                 while ( $prefixLength ) {
2163                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2164                         --$prefixLength;
2165                 }
2166                 if ( '' != $this->mLastSection ) {
2167                         $output .= '</' . $this->mLastSection . '>';
2168                         $this->mLastSection = '';
2169                 }
2170
2171                 wfProfileOut( $fname );
2172                 return $output;
2173         }
2174
2175         /**
2176          * Split up a string on ':', ignoring any occurences inside tags
2177          * to prevent illegal overlapping.
2178          * @param string $str the string to split
2179          * @param string &$before set to everything before the ':'
2180          * @param string &$after set to everything after the ':'
2181          * return string the position of the ':', or false if none found
2182          */
2183         function findColonNoLinks($str, &$before, &$after) {
2184                 $fname = 'Parser::findColonNoLinks';
2185                 wfProfileIn( $fname );
2186
2187                 $pos = strpos( $str, ':' );
2188                 if( $pos === false ) {
2189                         // Nothing to find!
2190                         wfProfileOut( $fname );
2191                         return false;
2192                 }
2193
2194                 $lt = strpos( $str, '<' );
2195                 if( $lt === false || $lt > $pos ) {
2196                         // Easy; no tag nesting to worry about
2197                         $before = substr( $str, 0, $pos );
2198                         $after = substr( $str, $pos+1 );
2199                         wfProfileOut( $fname );
2200                         return $pos;
2201                 }
2202
2203                 // Ugly state machine to walk through avoiding tags.
2204                 $state = self::COLON_STATE_TEXT;
2205                 $stack = 0;
2206                 $len = strlen( $str );
2207                 for( $i = 0; $i < $len; $i++ ) {
2208                         $c = $str{$i};
2209
2210                         switch( $state ) {
2211                         // (Using the number is a performance hack for common cases)
2212                         case 0: // self::COLON_STATE_TEXT:
2213                                 switch( $c ) {
2214                                 case "<":
2215                                         // Could be either a <start> tag or an </end> tag
2216                                         $state = self::COLON_STATE_TAGSTART;
2217                                         break;
2218                                 case ":":
2219                                         if( $stack == 0 ) {
2220                                                 // We found it!
2221                                                 $before = substr( $str, 0, $i );
2222                                                 $after = substr( $str, $i + 1 );
2223                                                 wfProfileOut( $fname );
2224                                                 return $i;
2225                                         }
2226                                         // Embedded in a tag; don't break it.
2227                                         break;
2228                                 default:
2229                                         // Skip ahead looking for something interesting
2230                                         $colon = strpos( $str, ':', $i );
2231                                         if( $colon === false ) {
2232                                                 // Nothing else interesting
2233                                                 wfProfileOut( $fname );
2234                                                 return false;
2235                                         }
2236                                         $lt = strpos( $str, '<', $i );
2237                                         if( $stack === 0 ) {
2238                                                 if( $lt === false || $colon < $lt ) {
2239                                                         // We found it!
2240                                                         $before = substr( $str, 0, $colon );
2241                                                         $after = substr( $str, $colon + 1 );
2242                                                         wfProfileOut( $fname );
2243                                                         return $i;
2244                                                 }
2245                                         }
2246                                         if( $lt === false ) {
2247                                                 // Nothing else interesting to find; abort!
2248                                                 // We're nested, but there's no close tags left. Abort!
2249                                                 break 2;
2250                                         }
2251                                         // Skip ahead to next tag start
2252                                         $i = $lt;
2253                                         $state = self::COLON_STATE_TAGSTART;
2254                                 }
2255                                 break;
2256                         case 1: // self::COLON_STATE_TAG:
2257                                 // In a <tag>
2258                                 switch( $c ) {
2259                                 case ">":
2260                                         $stack++;
2261                                         $state = self::COLON_STATE_TEXT;
2262                                         break;
2263                                 case "/":
2264                                         // Slash may be followed by >?
2265                                         $state = self::COLON_STATE_TAGSLASH;
2266                                         break;
2267                                 default:
2268                                         // ignore
2269                                 }
2270                                 break;
2271                         case 2: // self::COLON_STATE_TAGSTART:
2272                                 switch( $c ) {
2273                                 case "/":
2274                                         $state = self::COLON_STATE_CLOSETAG;
2275                                         break;
2276                                 case "!":
2277                                         $state = self::COLON_STATE_COMMENT;
2278                                         break;
2279                                 case ">":
2280                                         // Illegal early close? This shouldn't happen D:
2281                                         $state = self::COLON_STATE_TEXT;
2282                                         break;
2283                                 default:
2284                                         $state = self::COLON_STATE_TAG;
2285                                 }
2286                                 break;
2287                         case 3: // self::COLON_STATE_CLOSETAG:
2288                                 // In a </tag>
2289                                 if( $c == ">" ) {
2290                                         $stack--;
2291                                         if( $stack < 0 ) {
2292                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2293                                                 wfProfileOut( $fname );
2294                                                 return false;
2295                                         }
2296                                         $state = self::COLON_STATE_TEXT;
2297                                 }
2298                                 break;
2299                         case self::COLON_STATE_TAGSLASH:
2300                                 if( $c == ">" ) {
2301                                         // Yes, a self-closed tag <blah/>
2302                                         $state = self::COLON_STATE_TEXT;
2303                                 } else {
2304                                         // Probably we're jumping the gun, and this is an attribute
2305                                         $state = self::COLON_STATE_TAG;
2306                                 }
2307                                 break;
2308                         case 5: // self::COLON_STATE_COMMENT:
2309                                 if( $c == "-" ) {
2310                                         $state = self::COLON_STATE_COMMENTDASH;
2311                                 }
2312                                 break;
2313                         case self::COLON_STATE_COMMENTDASH:
2314                                 if( $c == "-" ) {
2315                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2316                                 } else {
2317                                         $state = self::COLON_STATE_COMMENT;
2318                                 }
2319                                 break;
2320                         case self::COLON_STATE_COMMENTDASHDASH:
2321                                 if( $c == ">" ) {
2322                                         $state = self::COLON_STATE_TEXT;
2323                                 } else {
2324                                         $state = self::COLON_STATE_COMMENT;
2325                                 }
2326                                 break;
2327                         default:
2328                                 throw new MWException( "State machine error in $fname" );
2329                         }
2330                 }
2331                 if( $stack > 0 ) {
2332                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2333                         return false;
2334                 }
2335                 wfProfileOut( $fname );
2336                 return false;
2337         }
2338
2339         /**
2340          * Return value of a magic variable (like PAGENAME)
2341          *
2342          * @private
2343          */
2344         function getVariableValue( $index ) {
2345                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2346
2347                 /**
2348                  * Some of these require message or data lookups and can be
2349                  * expensive to check many times.
2350                  */
2351                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2352                         if ( isset( $this->mVarCache[$index] ) ) {
2353                                 return $this->mVarCache[$index];
2354                         }
2355                 }
2356
2357                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2358                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2359
2360                 # Use the time zone
2361                 global $wgLocaltimezone;
2362                 if ( isset( $wgLocaltimezone ) ) {
2363                         $oldtz = getenv( 'TZ' );
2364                         putenv( 'TZ='.$wgLocaltimezone );
2365                 }
2366
2367                 wfSuppressWarnings(); // E_STRICT system time bitching
2368                 $localTimestamp = date( 'YmdHis', $ts );
2369                 $localMonth = date( 'm', $ts );
2370                 $localMonthName = date( 'n', $ts );
2371                 $localDay = date( 'j', $ts );
2372                 $localDay2 = date( 'd', $ts );
2373                 $localDayOfWeek = date( 'w', $ts );
2374                 $localWeek = date( 'W', $ts );
2375                 $localYear = date( 'Y', $ts );
2376                 $localHour = date( 'H', $ts );
2377                 if ( isset( $wgLocaltimezone ) ) {
2378                         putenv( 'TZ='.$oldtz );
2379                 }
2380                 wfRestoreWarnings();
2381
2382                 switch ( $index ) {
2383                         case 'currentmonth':
2384                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2385                         case 'currentmonthname':
2386                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2387                         case 'currentmonthnamegen':
2388                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2389                         case 'currentmonthabbrev':
2390                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2391                         case 'currentday':
2392                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2393                         case 'currentday2':
2394                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2395                         case 'localmonth':
2396                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth );
2397                         case 'localmonthname':
2398                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( $localMonthName );
2399                         case 'localmonthnamegen':
2400                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2401                         case 'localmonthabbrev':
2402                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2403                         case 'localday':
2404                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay );
2405                         case 'localday2':
2406                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay2 );
2407                         case 'pagename':
2408                                 return wfEscapeWikiText( $this->mTitle->getText() );
2409                         case 'pagenamee':
2410                                 return $this->mTitle->getPartialURL();
2411                         case 'fullpagename':
2412                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2413                         case 'fullpagenamee':
2414                                 return $this->mTitle->getPrefixedURL();
2415                         case 'subpagename':
2416                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2417                         case 'subpagenamee':
2418                                 return $this->mTitle->getSubpageUrlForm();
2419                         case 'basepagename':
2420                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2421                         case 'basepagenamee':
2422                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2423                         case 'talkpagename':
2424                                 if( $this->mTitle->canTalk() ) {
2425                                         $talkPage = $this->mTitle->getTalkPage();
2426                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2427                                 } else {
2428                                         return '';
2429                                 }
2430                         case 'talkpagenamee':
2431                                 if( $this->mTitle->canTalk() ) {
2432                                         $talkPage = $this->mTitle->getTalkPage();
2433                                         return $talkPage->getPrefixedUrl();
2434                                 } else {
2435                                         return '';
2436                                 }
2437                         case 'subjectpagename':
2438                                 $subjPage = $this->mTitle->getSubjectPage();
2439                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2440                         case 'subjectpagenamee':
2441                                 $subjPage = $this->mTitle->getSubjectPage();
2442                                 return $subjPage->getPrefixedUrl();
2443                         case 'revisionid':
2444                                 // Let the edit saving system know we should parse the page
2445                                 // *after* a revision ID has been assigned.
2446                                 $this->mOutput->setFlag( 'vary-revision' );
2447                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2448                                 return $this->mRevisionId;
2449                         case 'revisionday':
2450                                 // Let the edit saving system know we should parse the page
2451                                 // *after* a revision ID has been assigned. This is for null edits.
2452                                 $this->mOutput->setFlag( 'vary-revision' );
2453                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2454                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2455                         case 'revisionday2':
2456                                 // Let the edit saving system know we should parse the page
2457                                 // *after* a revision ID has been assigned. This is for null edits.
2458                                 $this->mOutput->setFlag( 'vary-revision' );
2459                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2460                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2461                         case 'revisionmonth':
2462                                 // Let the edit saving system know we should parse the page
2463                                 // *after* a revision ID has been assigned. This is for null edits.
2464                                 $this->mOutput->setFlag( 'vary-revision' );
2465                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2466                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2467                         case 'revisionyear':
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__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2472                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2473                         case 'revisiontimestamp':
2474                                 // Let the edit saving system know we should parse the page
2475                                 // *after* a revision ID has been assigned. This is for null edits.
2476                                 $this->mOutput->setFlag( 'vary-revision' );
2477                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2478                                 return $this->getRevisionTimestamp();
2479                         case 'namespace':
2480                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2481                         case 'namespacee':
2482                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2483                         case 'talkspace':
2484                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2485                         case 'talkspacee':
2486                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2487                         case 'subjectspace':
2488                                 return $this->mTitle->getSubjectNsText();
2489                         case 'subjectspacee':
2490                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2491                         case 'currentdayname':
2492                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2493                         case 'currentyear':
2494                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2495                         case 'currenttime':
2496                                 return $this->mVarCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2497                         case 'currenthour':
2498                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2499                         case 'currentweek':
2500                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2501                                 // int to remove the padding
2502                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2503                         case 'currentdow':
2504                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2505                         case 'localdayname':
2506                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2507                         case 'localyear':
2508                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localYear, true );
2509                         case 'localtime':
2510                                 return $this->mVarCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2511                         case 'localhour':
2512                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localHour, true );
2513                         case 'localweek':
2514                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2515                                 // int to remove the padding
2516                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2517                         case 'localdow':
2518                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2519                         case 'numberofarticles':
2520                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2521                         case 'numberoffiles':
2522                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2523                         case 'numberofusers':
2524                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2525                         case 'numberofpages':
2526                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2527                         case 'numberofadmins':
2528                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::admins() );
2529                         case 'numberofedits':
2530                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2531                         case 'currenttimestamp':
2532                                 return $this->mVarCache[$index] = wfTimestamp( TS_MW, $ts );
2533                         case 'localtimestamp':
2534                                 return $this->mVarCache[$index] = $localTimestamp;
2535                         case 'currentversion':
2536                                 return $this->mVarCache[$index] = SpecialVersion::getVersion();
2537                         case 'sitename':
2538                                 return $wgSitename;
2539                         case 'server':
2540                                 return $wgServer;
2541                         case 'servername':
2542                                 return $wgServerName;
2543                         case 'scriptpath':
2544                                 return $wgScriptPath;
2545                         case 'directionmark':
2546                                 return $wgContLang->getDirMark();
2547                         case 'contentlanguage':
2548                                 global $wgContLanguageCode;
2549                                 return $wgContLanguageCode;
2550                         default:
2551                                 $ret = null;
2552                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret ) ) )
2553                                         return $ret;
2554                                 else
2555                                         return null;
2556                 }
2557         }
2558
2559         /**
2560          * initialise the magic variables (like CURRENTMONTHNAME)
2561          *
2562          * @private
2563          */
2564         function initialiseVariables() {
2565                 $fname = 'Parser::initialiseVariables';
2566                 wfProfileIn( $fname );
2567                 $variableIDs = MagicWord::getVariableIDs();
2568
2569                 $this->mVariables = new MagicWordArray( $variableIDs );
2570                 wfProfileOut( $fname );
2571         }
2572
2573         /**
2574          * Preprocess some wikitext and return the document tree.
2575          * This is the ghost of replace_variables().
2576          *
2577          * @param string $text The text to parse
2578          * @param integer flags Bitwise combination of:
2579          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2580          *                                     included. Default is to assume a direct page view.
2581          *
2582          * The generated DOM tree must depend only on the input text and the flags.
2583          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2584          *
2585          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2586          * change in the DOM tree for a given text, must be passed through the section identifier
2587          * in the section edit link and thus back to extractSections().
2588          *
2589          * The output of this function is currently only cached in process memory, but a persistent
2590          * cache may be implemented at a later date which takes further advantage of these strict
2591          * dependency requirements.
2592          *
2593          * @private
2594          */
2595         function preprocessToDom ( $text, $flags = 0 ) {
2596                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2597                 return $dom;
2598         }
2599
2600         /*
2601          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2602          */
2603         public static function splitWhitespace( $s ) {
2604                 $ltrimmed = ltrim( $s );
2605                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2606                 $trimmed = rtrim( $ltrimmed );
2607                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2608                 if ( $diff > 0 ) {
2609                         $w2 = substr( $ltrimmed, -$diff );
2610                 } else {
2611                         $w2 = '';
2612                 }
2613                 return array( $w1, $trimmed, $w2 );
2614         }
2615
2616         /**
2617          * Replace magic variables, templates, and template arguments
2618          * with the appropriate text. Templates are substituted recursively,
2619          * taking care to avoid infinite loops.
2620          *
2621          * Note that the substitution depends on value of $mOutputType:
2622          *  self::OT_WIKI: only {{subst:}} templates
2623          *  self::OT_PREPROCESS: templates but not extension tags
2624          *  self::OT_HTML: all templates and extension tags
2625          *
2626          * @param string $tex The text to transform
2627          * @param PPFrame $frame Object describing the arguments passed to the template
2628          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2629          * @private
2630          */
2631         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2632                 # Prevent too big inclusions
2633                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2634                         return $text;
2635                 }
2636
2637                 $fname = __METHOD__;
2638                 wfProfileIn( $fname );
2639
2640                 if ( $frame === false ) {
2641                         $frame = $this->getPreprocessor()->newFrame();
2642                 } elseif ( !( $frame instanceof PPFrame ) ) {
2643                         throw new MWException( __METHOD__ . ' called using the old argument format' );
2644                 }
2645
2646                 $dom = $this->preprocessToDom( $text );
2647                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2648                 $text = $frame->expand( $dom, $flags );
2649
2650                 wfProfileOut( $fname );
2651                 return $text;
2652         }
2653
2654         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2655         static function createAssocArgs( $args ) {
2656                 $assocArgs = array();
2657                 $index = 1;
2658                 foreach( $args as $arg ) {
2659                         $eqpos = strpos( $arg, '=' );
2660                         if ( $eqpos === false ) {
2661                                 $assocArgs[$index++] = $arg;
2662                         } else {
2663                                 $name = trim( substr( $arg, 0, $eqpos ) );
2664                                 $value = trim( substr( $arg, $eqpos+1 ) );
2665                                 if ( $value === false ) {
2666                                         $value = '';
2667                                 }
2668                                 if ( $name !== false ) {
2669                                         $assocArgs[$name] = $value;
2670                                 }
2671                         }
2672                 }
2673
2674                 return $assocArgs;
2675         }
2676
2677         /**
2678          * Return the text of a template, after recursively
2679          * replacing any variables or templates within the template.
2680          *
2681          * @param array $piece The parts of the template
2682          *  $piece['title']: the title, i.e. the part before the |
2683          *  $piece['parts']: the parameter array
2684          *  $piece['lineStart']: whether the brace was at the start of a line
2685          * @param PPFrame The current frame, contains template arguments
2686          * @return string the text of the template
2687          * @private
2688          */
2689         function braceSubstitution( $piece, $frame ) {
2690                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2691                 $fname = __METHOD__;
2692                 wfProfileIn( $fname );
2693                 wfProfileIn( __METHOD__.'-setup' );
2694
2695                 # Flags
2696                 $found = false;             # $text has been filled
2697                 $nowiki = false;            # wiki markup in $text should be escaped
2698                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2699                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2700                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2701                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2702
2703                 # Title object, where $text came from
2704                 $title = NULL;
2705
2706                 # $part1 is the bit before the first |, and must contain only title characters.
2707                 # Various prefixes will be stripped from it later.
2708                 $titleWithSpaces = $frame->expand( $piece['title'] );
2709                 $part1 = trim( $titleWithSpaces );
2710                 $titleText = false;
2711
2712                 # Original title text preserved for various purposes
2713                 $originalTitle = $part1;
2714
2715                 # $args is a list of argument nodes, starting from index 0, not including $part1
2716                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2717                 wfProfileOut( __METHOD__.'-setup' );
2718
2719                 # SUBST
2720                 wfProfileIn( __METHOD__.'-modifiers' );
2721                 if ( !$found ) {
2722                         $mwSubst =& MagicWord::get( 'subst' );
2723                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2724                                 # One of two possibilities is true:
2725                                 # 1) Found SUBST but not in the PST phase
2726                                 # 2) Didn't find SUBST and in the PST phase
2727                                 # In either case, return without further processing
2728                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2729                                 $isLocalObj = true;
2730                                 $found = true;
2731                         }
2732                 }
2733
2734                 # Variables
2735                 if ( !$found && $args->getLength() == 0 ) {
2736                         $id = $this->mVariables->matchStartToEnd( $part1 );
2737                         if ( $id !== false ) {
2738                                 $text = $this->getVariableValue( $id );
2739                                 if (MagicWord::getCacheTTL($id)>-1)
2740                                         $this->mOutput->mContainsOldMagic = true;
2741                                 $found = true;
2742                         }
2743                 }
2744
2745                 # MSG, MSGNW and RAW
2746                 if ( !$found ) {
2747                         # Check for MSGNW:
2748                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2749                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2750                                 $nowiki = true;
2751                         } else {
2752                                 # Remove obsolete MSG:
2753                                 $mwMsg =& MagicWord::get( 'msg' );
2754                                 $mwMsg->matchStartAndRemove( $part1 );
2755                         }
2756
2757                         # Check for RAW:
2758                         $mwRaw =& MagicWord::get( 'raw' );
2759                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2760                                 $forceRawInterwiki = true;
2761                         }
2762                 }
2763                 wfProfileOut( __METHOD__.'-modifiers' );
2764
2765                 # Parser functions
2766                 if ( !$found ) {
2767                         wfProfileIn( __METHOD__ . '-pfunc' );
2768
2769                         $colonPos = strpos( $part1, ':' );
2770                         if ( $colonPos !== false ) {
2771                                 # Case sensitive functions
2772                                 $function = substr( $part1, 0, $colonPos );
2773                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2774                                         $function = $this->mFunctionSynonyms[1][$function];
2775                                 } else {
2776                                         # Case insensitive functions
2777                                         $function = strtolower( $function );
2778                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2779                                                 $function = $this->mFunctionSynonyms[0][$function];
2780                                         } else {
2781                                                 $function = false;
2782                                         }
2783                                 }
2784                                 if ( $function ) {
2785                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2786                                         $initialArgs = array( &$this );
2787                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2788                                         if ( $flags & SFH_OBJECT_ARGS ) {
2789                                                 # Add a frame parameter, and pass the arguments as an array
2790                                                 $allArgs = $initialArgs;
2791                                                 $allArgs[] = $frame;
2792                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2793                                                         $funcArgs[] = $args->item( $i );
2794                                                 }
2795                                                 $allArgs[] = $funcArgs;
2796                                         } else {
2797                                                 # Convert arguments to plain text
2798                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2799                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2800                                                 }
2801                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2802                                         }
2803
2804                                         # Workaround for PHP bug 35229 and similar
2805                                         if ( !is_callable( $callback ) ) {
2806                                                 throw new MWException( "Tag hook for $name is not callable\n" );
2807                                         }
2808                                         $result = call_user_func_array( $callback, $allArgs );
2809                                         $found = true;
2810
2811                                         if ( is_array( $result ) ) {
2812                                                 if ( isset( $result[0] ) ) {
2813                                                         $text = $result[0];
2814                                                         unset( $result[0] );
2815                                                 }
2816
2817                                                 // Extract flags into the local scope
2818                                                 // This allows callers to set flags such as nowiki, found, etc.
2819                                                 extract( $result );
2820                                         } else {
2821                                                 $text = $result;
2822                                         }
2823                                 }
2824                         }
2825                         wfProfileOut( __METHOD__ . '-pfunc' );
2826                 }
2827
2828                 # Finish mangling title and then check for loops.
2829                 # Set $title to a Title object and $titleText to the PDBK
2830                 if ( !$found ) {
2831                         $ns = NS_TEMPLATE;
2832                         # Split the title into page and subpage
2833                         $subpage = '';
2834                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2835                         if ($subpage !== '') {
2836                                 $ns = $this->mTitle->getNamespace();
2837                         }
2838                         $title = Title::newFromText( $part1, $ns );
2839                         if ( $title ) {
2840                                 $titleText = $title->getPrefixedText();
2841                                 # Check for language variants if the template is not found
2842                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2843                                         $wgContLang->findVariantLink($part1, $title);
2844                                 }
2845                                 # Do infinite loop check
2846                                 if ( !$frame->loopCheck( $title ) ) {
2847                                         $found = true;
2848                                         $text = "<span class=\"error\">Template loop detected: [[$titleText]]</span>";
2849                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2850                                 }
2851                                 # Do recursion depth check
2852                                 $limit = $this->mOptions->getMaxTemplateDepth();
2853                                 if ( $frame->depth >= $limit ) {
2854                                         $found = true;
2855                                         $text = "<span class=\"error\">Template recursion depth limit exceeded ($limit)</span>";
2856                                 }
2857                         }
2858                 }
2859
2860                 # Load from database
2861                 if ( !$found && $title ) {
2862                         wfProfileIn( __METHOD__ . '-loadtpl' );
2863                         if ( !$title->isExternal() ) {
2864                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2865                                         $text = SpecialPage::capturePath( $title );
2866                                         if ( is_string( $text ) ) {
2867                                                 $found = true;
2868                                                 $isHTML = true;
2869                                                 $this->disableCache();
2870                                         }
2871                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2872                                         $found = false; //access denied
2873                                         wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
2874                                 } else {
2875                                         list( $text, $title ) = $this->getTemplateDom( $title );
2876                                         if ( $text !== false ) {
2877                                                 $found = true;
2878                                                 $isChildObj = true;
2879                                         }
2880                                 }
2881
2882                                 # If the title is valid but undisplayable, make a link to it
2883                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2884                                         $text = "[[:$titleText]]";
2885                                         $found = true;
2886                                 }
2887                         } elseif ( $title->isTrans() ) {
2888                                 // Interwiki transclusion
2889                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2890                                         $text = $this->interwikiTransclude( $title, 'render' );
2891                                         $isHTML = true;
2892                                 } else {
2893                                         $text = $this->interwikiTransclude( $title, 'raw' );
2894                                         // Preprocess it like a template
2895                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2896                                         $isChildObj = true;
2897                                 }
2898                                 $found = true;
2899                         }
2900                         wfProfileOut( __METHOD__ . '-loadtpl' );
2901                 }
2902
2903                 # If we haven't found text to substitute by now, we're done
2904                 # Recover the source wikitext and return it
2905                 if ( !$found ) {
2906                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2907                         wfProfileOut( $fname );
2908                         return array( 'object' => $text );
2909                 }
2910
2911                 # Expand DOM-style return values in a child frame
2912                 if ( $isChildObj ) {
2913                         # Clean up argument array
2914                         $newFrame = $frame->newChild( $args, $title );
2915
2916                         if ( $nowiki ) {
2917                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
2918                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
2919                                 # Expansion is eligible for the empty-frame cache
2920                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
2921                                         $text = $this->mTplExpandCache[$titleText];
2922                                 } else {
2923                                         $text = $newFrame->expand( $text );
2924                                         $this->mTplExpandCache[$titleText] = $text;
2925                                 }
2926                         } else {
2927                                 # Uncached expansion
2928                                 $text = $newFrame->expand( $text );
2929                         }
2930                 }
2931                 if ( $isLocalObj && $nowiki ) {
2932                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
2933                         $isLocalObj = false;
2934                 }
2935
2936                 # Replace raw HTML by a placeholder
2937                 # Add a blank line preceding, to prevent it from mucking up
2938                 # immediately preceding headings
2939                 if ( $isHTML ) {
2940                         $text = "\n\n" . $this->insertStripItem( $text );
2941                 }
2942                 # Escape nowiki-style return values
2943                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2944                         $text = wfEscapeWikiText( $text );
2945                 }
2946                 # Bug 529: if the template begins with a table or block-level
2947                 # element, it should be treated as beginning a new line.
2948                 # This behaviour is somewhat controversial.
2949                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
2950                         $text = "\n" . $text;
2951                 }
2952
2953                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
2954                         # Error, oversize inclusion
2955                         $text = "[[$originalTitle]]" .
2956                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
2957                 }
2958
2959                 if ( $isLocalObj ) {
2960                         $ret = array( 'object' => $text );
2961                 } else {
2962                         $ret = array( 'text' => $text );
2963                 }
2964
2965                 wfProfileOut( $fname );
2966                 return $ret;
2967         }
2968
2969         /**
2970          * Get the semi-parsed DOM representation of a template with a given title,
2971          * and its redirect destination title. Cached.
2972          */
2973         function getTemplateDom( $title ) {
2974                 $cacheTitle = $title;
2975                 $titleText = $title->getPrefixedDBkey();
2976
2977                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
2978                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
2979                         $title = Title::makeTitle( $ns, $dbk );
2980                         $titleText = $title->getPrefixedDBkey();
2981                 }
2982                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
2983                         return array( $this->mTplDomCache[$titleText], $title );
2984                 }
2985
2986                 // Cache miss, go to the database
2987                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
2988
2989                 if ( $text === false ) {
2990                         $this->mTplDomCache[$titleText] = false;
2991                         return array( false, $title );
2992                 }
2993
2994                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2995                 $this->mTplDomCache[ $titleText ] = $dom;
2996
2997                 if (! $title->equals($cacheTitle)) {
2998                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
2999                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3000                 }
3001
3002                 return array( $dom, $title );
3003         }
3004
3005         /**
3006          * Fetch the unparsed text of a template and register a reference to it.
3007          */
3008         function fetchTemplateAndTitle( $title ) {
3009                 $templateCb = $this->mOptions->getTemplateCallback();
3010                 $stuff = call_user_func( $templateCb, $title );
3011                 $text = $stuff['text'];
3012                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3013                 if ( isset( $stuff['deps'] ) ) {
3014                         foreach ( $stuff['deps'] as $dep ) {
3015                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3016                         }
3017                 }
3018                 return array($text,$finalTitle);
3019         }
3020
3021         function fetchTemplate( $title ) {
3022                 $rv = $this->fetchTemplateAndTitle($title);
3023                 return $rv[0];
3024         }
3025
3026         /**
3027          * Static function to get a template
3028          * Can be overridden via ParserOptions::setTemplateCallback().
3029          */
3030         static function statelessFetchTemplate( $title ) {
3031                 $text = $skip = false;
3032                 $finalTitle = $title;
3033                 $deps = array();
3034
3035                 // Loop to fetch the article, with up to 1 redirect
3036                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3037                         # Give extensions a chance to select the revision instead
3038                         $id = false; // Assume current
3039                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3040
3041                         if( $skip ) {
3042                                 $text = false;
3043                                 $deps[] = array(
3044                                         'title' => $title,
3045                                         'page_id' => $title->getArticleID(),
3046                                         'rev_id' => null );
3047                                 break;
3048                         }
3049                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3050                         $rev_id = $rev ? $rev->getId() : 0;
3051
3052                         $deps[] = array(
3053                                 'title' => $title,
3054                                 'page_id' => $title->getArticleID(),
3055                                 'rev_id' => $rev_id );
3056
3057                         if( $rev ) {
3058                                 $text = $rev->getText();
3059                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3060                                 global $wgLang;
3061                                 $message = $wgLang->lcfirst( $title->getText() );
3062                                 $text = wfMsgForContentNoTrans( $message );
3063                                 if( wfEmptyMsg( $message, $text ) ) {
3064                                         $text = false;
3065                                         break;
3066                                 }
3067                         } else {
3068                                 break;
3069                         }
3070                         if ( $text === false ) {
3071                                 break;
3072                         }
3073                         // Redirect?
3074                         $finalTitle = $title;
3075                         $title = Title::newFromRedirect( $text );
3076                 }
3077                 return array(
3078                         'text' => $text,
3079                         'finalTitle' => $finalTitle,
3080                         'deps' => $deps );
3081         }
3082
3083         /**
3084          * Transclude an interwiki link.
3085          */
3086         function interwikiTransclude( $title, $action ) {
3087                 global $wgEnableScaryTranscluding;
3088
3089                 if (!$wgEnableScaryTranscluding)
3090                         return wfMsg('scarytranscludedisabled');
3091
3092                 $url = $title->getFullUrl( "action=$action" );
3093
3094                 if (strlen($url) > 255)
3095                         return wfMsg('scarytranscludetoolong');
3096                 return $this->fetchScaryTemplateMaybeFromCache($url);
3097         }
3098
3099         function fetchScaryTemplateMaybeFromCache($url) {
3100                 global $wgTranscludeCacheExpiry;
3101                 $dbr = wfGetDB(DB_SLAVE);
3102                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3103                                 array('tc_url' => $url));
3104                 if ($obj) {
3105                         $time = $obj->tc_time;
3106                         $text = $obj->tc_contents;
3107                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3108                                 return $text;
3109                         }
3110                 }
3111
3112                 $text = Http::get($url);
3113                 if (!$text)
3114                         return wfMsg('scarytranscludefailed', $url);
3115
3116                 $dbw = wfGetDB(DB_MASTER);
3117                 $dbw->replace('transcache', array('tc_url'), array(
3118                         'tc_url' => $url,
3119                         'tc_time' => time(),
3120                         'tc_contents' => $text));
3121                 return $text;
3122         }
3123
3124
3125         /**
3126          * Triple brace replacement -- used for template arguments
3127          * @private
3128          */
3129         function argSubstitution( $piece, $frame ) {
3130                 wfProfileIn( __METHOD__ );
3131
3132                 $error = false;
3133                 $parts = $piece['parts'];
3134                 $nameWithSpaces = $frame->expand( $piece['title'] );
3135                 $argName = trim( $nameWithSpaces );
3136                 $object = false;
3137                 $text = $frame->getArgument( $argName );
3138                 if (  $text === false && $parts->getLength() > 0
3139                   && (
3140                     $this->ot['html']
3141                     || $this->ot['pre']
3142                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3143                   )
3144                 ) {
3145                         # No match in frame, use the supplied default
3146                         $object = $parts->item( 0 )->getChildren();
3147                 }
3148                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3149                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3150                 }
3151
3152                 if ( $text === false && $object === false ) {
3153                         # No match anywhere
3154                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3155                 }
3156                 if ( $error !== false ) {
3157                         $text .= $error;
3158                 }
3159                 if ( $object !== false ) {
3160                         $ret = array( 'object' => $object );
3161                 } else {
3162                         $ret = array( 'text' => $text );
3163                 }
3164
3165                 wfProfileOut( __METHOD__ );
3166                 return $ret;
3167         }
3168
3169         /**
3170          * Return the text to be used for a given extension tag.
3171          * This is the ghost of strip().
3172          *
3173          * @param array $params Associative array of parameters:
3174          *     name       PPNode for the tag name
3175          *     attr       PPNode for unparsed text where tag attributes are thought to be
3176          *     attributes Optional associative array of parsed attributes
3177          *     inner      Contents of extension element
3178          *     noClose    Original text did not have a close tag
3179          * @param PPFrame $frame
3180          */
3181         function extensionSubstitution( $params, $frame ) {
3182                 global $wgRawHtml, $wgContLang;
3183
3184                 $name = $frame->expand( $params['name'] );
3185                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3186                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3187
3188                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . $this->mMarkerSuffix;
3189
3190                 if ( $this->ot['html'] ) {
3191                         $name = strtolower( $name );
3192
3193                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3194                         if ( isset( $params['attributes'] ) ) {
3195                                 $attributes = $attributes + $params['attributes'];
3196                         }
3197                         switch ( $name ) {
3198                                 case 'html':
3199                                         if( $wgRawHtml ) {
3200                                                 $output = $content;
3201                                                 break;
3202                                         } else {
3203                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3204                                         }
3205                                 case 'nowiki':
3206                                         $output = Xml::escapeTagsOnly( $content );
3207                                         break;
3208                                 case 'math':
3209                                         $output = $wgContLang->armourMath(
3210                                                 MathRenderer::renderMath( $content, $attributes ) );
3211                                         break;
3212                                 case 'gallery':
3213                                         $output = $this->renderImageGallery( $content, $attributes );
3214                                         break;
3215                                 default:
3216                                         if( isset( $this->mTagHooks[$name] ) ) {
3217                                                 # Workaround for PHP bug 35229 and similar
3218                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3219                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3220                                                 }
3221                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3222                                                         array( $content, $attributes, $this ) );
3223                                         } else {
3224                                                 throw new MWException( "Invalid call hook $name" );
3225                                         }
3226                         }
3227                 } else {
3228                         if ( is_null( $attrText ) ) {
3229                                 $attrText = '';
3230                         }
3231                         if ( isset( $params['attributes'] ) ) {
3232                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3233                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3234                                                 htmlspecialchars( $attrValue ) . '"';
3235                                 }
3236                         }
3237                         if ( $content === null ) {
3238                                 $output = "<$name$attrText/>";
3239                         } else {
3240                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3241                                 $output = "<$name$attrText>$content$close";
3242                         }
3243                 }
3244
3245                 if ( $name == 'html' || $name == 'nowiki' ) {
3246                         $this->mStripState->nowiki->setPair( $marker, $output );
3247                 } else {
3248                         $this->mStripState->general->setPair( $marker, $output );
3249                 }
3250                 return $marker;
3251         }
3252
3253         /**
3254          * Increment an include size counter
3255          *
3256          * @param string $type The type of expansion
3257          * @param integer $size The size of the text
3258          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3259          */
3260         function incrementIncludeSize( $type, $size ) {
3261                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3262                         return false;
3263                 } else {
3264                         $this->mIncludeSizes[$type] += $size;
3265                         return true;
3266                 }
3267         }
3268
3269         /**
3270          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3271          * Fills $this->mDoubleUnderscores, returns the modified text
3272          */
3273         function doDoubleUnderscore( $text ) {
3274                 // The position of __TOC__ needs to be recorded
3275                 $mw = MagicWord::get( 'toc' );
3276                 if( $mw->match( $text ) ) {
3277                         $this->mShowToc = true;
3278                         $this->mForceTocPosition = true;
3279
3280                         // Set a placeholder. At the end we'll fill it in with the TOC.
3281                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3282
3283                         // Only keep the first one.
3284                         $text = $mw->replace( '', $text );
3285                 }
3286
3287                 // Now match and remove the rest of them
3288                 $mwa = MagicWord::getDoubleUnderscoreArray();
3289                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3290
3291                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3292                         $this->mOutput->mNoGallery = true;
3293                 }
3294                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3295                         $this->mShowToc = false;
3296                 }
3297                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3298                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3299
3300                         $containerCategory = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( 'hidden-category-category' ) );
3301                         if ( $containerCategory ) {
3302                                 $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3303                         } else {
3304                                 wfDebug( __METHOD__.": [[MediaWiki:hidden-category-category]] is not a valid title!\n" );
3305                         }
3306                 }
3307                 return $text;
3308         }
3309
3310         /**
3311          * This function accomplishes several tasks:
3312          * 1) Auto-number headings if that option is enabled
3313          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3314          * 3) Add a Table of contents on the top for users who have enabled the option
3315          * 4) Auto-anchor headings
3316          *
3317          * It loops through all headlines, collects the necessary data, then splits up the
3318          * string and re-inserts the newly formatted headlines.
3319          *
3320          * @param string $text
3321          * @param boolean $isMain
3322          * @private
3323          */
3324         function formatHeadings( $text, $isMain=true ) {
3325                 global $wgMaxTocLevel, $wgContLang;
3326
3327                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3328                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3329                         $showEditLink = 0;
3330                 } else {
3331                         $showEditLink = $this->mOptions->getEditSection();
3332                 }
3333
3334                 # Inhibit editsection links if requested in the page
3335                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
3336                         $showEditLink = 0;
3337                 }
3338
3339                 # Get all headlines for numbering them and adding funky stuff like [edit]
3340                 # links - this is for later, but we need the number of headlines right now
3341                 $matches = array();
3342                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3343
3344                 # if there are fewer than 4 headlines in the article, do not show TOC
3345                 # unless it's been explicitly enabled.
3346                 $enoughToc = $this->mShowToc &&
3347                         (($numMatches >= 4) || $this->mForceTocPosition);
3348
3349                 # Allow user to stipulate that a page should have a "new section"
3350                 # link added via __NEWSECTIONLINK__
3351                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3352                         $this->mOutput->setNewSection( true );
3353                 }
3354
3355                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3356                 # override above conditions and always show TOC above first header
3357                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3358                         $this->mShowToc = true;
3359                         $enoughToc = true;
3360                 }
3361
3362                 # We need this to perform operations on the HTML
3363                 $sk = $this->mOptions->getSkin();
3364
3365                 # headline counter
3366                 $headlineCount = 0;
3367                 $numVisible = 0;
3368
3369                 # Ugh .. the TOC should have neat indentation levels which can be
3370                 # passed to the skin functions. These are determined here
3371                 $toc = '';
3372                 $full = '';
3373                 $head = array();
3374                 $sublevelCount = array();
3375                 $levelCount = array();
3376                 $toclevel = 0;
3377                 $level = 0;
3378                 $prevlevel = 0;
3379                 $toclevel = 0;
3380                 $prevtoclevel = 0;
3381                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-{$this->mMarkerSuffix}";
3382                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3383                 $tocraw = array();
3384
3385                 foreach( $matches[3] as $headline ) {
3386                         $isTemplate = false;
3387                         $titleText = false;
3388                         $sectionIndex = false;
3389                         $numbering = '';
3390                         $markerMatches = array();
3391                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3392                                 $serial = $markerMatches[1];
3393                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3394                                 $isTemplate = ($titleText != $baseTitleText);
3395                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3396                         }
3397
3398                         if( $toclevel ) {
3399                                 $prevlevel = $level;
3400                                 $prevtoclevel = $toclevel;
3401                         }
3402                         $level = $matches[1][$headlineCount];
3403
3404                         if( $doNumberHeadings || $enoughToc ) {
3405
3406                                 if ( $level > $prevlevel ) {
3407                                         # Increase TOC level
3408                                         $toclevel++;
3409                                         $sublevelCount[$toclevel] = 0;
3410                                         if( $toclevel<$wgMaxTocLevel ) {
3411                                                 $prevtoclevel = $toclevel;
3412                                                 $toc .= $sk->tocIndent();
3413                                                 $numVisible++;
3414                                         }
3415                                 }
3416                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3417                                         # Decrease TOC level, find level to jump to
3418
3419                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3420                                                 # Can only go down to level 1
3421                                                 $toclevel = 1;
3422                                         } else {
3423                                                 for ($i = $toclevel; $i > 0; $i--) {
3424                                                         if ( $levelCount[$i] == $level ) {
3425                                                                 # Found last matching level
3426                                                                 $toclevel = $i;
3427                                                                 break;
3428                                                         }
3429                                                         elseif ( $levelCount[$i] < $level ) {
3430                                                                 # Found first matching level below current level
3431                                                                 $toclevel = $i + 1;
3432                                                                 break;
3433                                                         }
3434                                                 }
3435                                         }
3436                                         if( $toclevel<$wgMaxTocLevel ) {
3437                                                 if($prevtoclevel < $wgMaxTocLevel) {
3438                                                         # Unindent only if the previous toc level was shown :p
3439                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3440                                                 } else {
3441                                                         $toc .= $sk->tocLineEnd();
3442                                                 }
3443                                         }
3444                                 }
3445                                 else {
3446                                         # No change in level, end TOC line
3447                                         if( $toclevel<$wgMaxTocLevel ) {
3448                                                 $toc .= $sk->tocLineEnd();
3449                                         }
3450                                 }
3451
3452                                 $levelCount[$toclevel] = $level;
3453
3454                                 # count number of headlines for each level
3455                                 @$sublevelCount[$toclevel]++;
3456                                 $dot = 0;
3457                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3458                                         if( !empty( $sublevelCount[$i] ) ) {
3459                                                 if( $dot ) {
3460                                                         $numbering .= '.';
3461                                                 }
3462                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3463                                                 $dot = 1;
3464                                         }
3465                                 }
3466                         }
3467
3468                         # The safe header is a version of the header text safe to use for links
3469                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3470                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3471
3472                         # Remove link placeholders by the link text.
3473                         #     <!--LINK number-->
3474                         # turns into
3475                         #     link text with suffix
3476                         $safeHeadline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3477                                                             "\$this->mLinkHolders['texts'][\$1]",
3478                                                             $safeHeadline );
3479                         $safeHeadline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3480                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3481                                                             $safeHeadline );
3482
3483                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3484                         $tocline = preg_replace(
3485                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3486                                 array( '',                          '<$1>'),
3487                                 $safeHeadline
3488                         );
3489                         $tocline = trim( $tocline );
3490
3491                         # For the anchor, strip out HTML-y stuff period
3492                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3493                         $safeHeadline = trim( $safeHeadline );
3494
3495                         # Save headline for section edit hint before it's escaped
3496                         $headlineHint = $safeHeadline;
3497                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3498                         # HTML names must be case-insensitively unique (bug 10721)
3499                         $arrayKey = strtolower( $safeHeadline );
3500
3501                         # XXX : Is $refers[$headlineCount] ever accessed, actually ?
3502                         $refers[$headlineCount] = $safeHeadline;
3503
3504                         # count how many in assoc. array so we can track dupes in anchors
3505                         isset( $refers[$arrayKey] ) ? $refers[$arrayKey]++ : $refers[$arrayKey] = 1;
3506                         $refcount[$headlineCount] = $refers[$arrayKey];
3507
3508                         # Don't number the heading if it is the only one (looks silly)
3509                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3510                                 # the two are different if the line contains a link
3511                                 $headline=$numbering . ' ' . $headline;
3512                         }
3513
3514                         # Create the anchor for linking from the TOC to the section
3515                         $anchor = $safeHeadline;
3516                         if($refcount[$headlineCount] > 1 ) {
3517                                 $anchor .= '_' . $refcount[$headlineCount];
3518                         }
3519                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3520                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3521                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3522                         }
3523                         # give headline the correct <h#> tag
3524                         if( $showEditLink && $sectionIndex !== false ) {
3525                                 if( $isTemplate ) {
3526                                         # Put a T flag in the section identifier, to indicate to extractSections()
3527                                         # that sections inside <includeonly> should be counted.
3528                                         $editlink = $sk->editSectionLinkForOther($titleText, "T-$sectionIndex");
3529                                 } else {
3530                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3531                                 }
3532                         } else {
3533                                 $editlink = '';
3534                         }
3535                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3536
3537                         $headlineCount++;
3538                 }
3539
3540                 $this->mOutput->setSections( $tocraw );
3541
3542                 # Never ever show TOC if no headers
3543                 if( $numVisible < 1 ) {
3544                         $enoughToc = false;
3545                 }
3546
3547                 if( $enoughToc ) {
3548                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3549                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3550                         }
3551                         $toc = $sk->tocList( $toc );
3552                 }
3553
3554                 # split up and insert constructed headlines
3555
3556                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3557                 $i = 0;
3558
3559                 foreach( $blocks as $block ) {
3560                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3561                                 # This is the [edit] link that appears for the top block of text when
3562                                 # section editing is enabled
3563
3564                                 # Disabled because it broke block formatting
3565                                 # For example, a bullet point in the top line
3566                                 # $full .= $sk->editSectionLink(0);
3567                         }
3568                         $full .= $block;
3569                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3570                                 # Top anchor now in skin
3571                                 $full = $full.$toc;
3572                         }
3573
3574                         if( !empty( $head[$i] ) ) {
3575                                 $full .= $head[$i];
3576                         }
3577                         $i++;
3578                 }
3579                 if( $this->mForceTocPosition ) {
3580                         return str_replace( '<!--MWTOC-->', $toc, $full );
3581                 } else {
3582                         return $full;
3583                 }
3584         }
3585
3586         /**
3587          * Transform wiki markup when saving a page by doing \r\n -> \n
3588          * conversion, substitting signatures, {{subst:}} templates, etc.
3589          *
3590          * @param string $text the text to transform
3591          * @param Title &$title the Title object for the current article
3592          * @param User &$user the User object describing the current user
3593          * @param ParserOptions $options parsing options
3594          * @param bool $clearState whether to clear the parser state first
3595          * @return string the altered wiki markup
3596          * @public
3597          */
3598         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3599                 $this->mOptions = $options;
3600                 $this->setTitle( $title );
3601                 $this->setOutputType( self::OT_WIKI );
3602
3603                 if ( $clearState ) {
3604                         $this->clearState();
3605                 }
3606
3607                 $pairs = array(
3608                         "\r\n" => "\n",
3609                 );
3610                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3611                 $text = $this->pstPass2( $text, $user );
3612                 $text = $this->mStripState->unstripBoth( $text );
3613                 return $text;
3614         }
3615
3616         /**
3617          * Pre-save transform helper function
3618          * @private
3619          */
3620         function pstPass2( $text, $user ) {
3621                 global $wgContLang, $wgLocaltimezone;
3622
3623                 /* Note: This is the timestamp saved as hardcoded wikitext to
3624                  * the database, we use $wgContLang here in order to give
3625                  * everyone the same signature and use the default one rather
3626                  * than the one selected in each user's preferences.
3627                  *
3628                  * (see also bug 12815)
3629                  */
3630                 $ts = $this->mOptions->getTimestamp();
3631                 $tz = 'UTC';
3632                 if ( isset( $wgLocaltimezone ) ) {
3633                         $unixts = wfTimestamp( TS_UNIX, $ts );
3634                         $oldtz = getenv( 'TZ' );
3635                         putenv( 'TZ='.$wgLocaltimezone );
3636                         $ts = date( 'YmdHis', $unixts );
3637                         $tz = date( 'T', $unixts );  # might vary on DST changeover!
3638                         putenv( 'TZ='.$oldtz );
3639                 }
3640                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tz)";
3641
3642                 # Variable replacement
3643                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3644                 $text = $this->replaceVariables( $text );
3645
3646                 # Signatures
3647                 $sigText = $this->getUserSig( $user );
3648                 $text = strtr( $text, array(
3649                         '~~~~~' => $d,
3650                         '~~~~' => "$sigText $d",
3651                         '~~~' => $sigText
3652                 ) );
3653
3654                 # Context links: [[|name]] and [[name (context)|]]
3655                 #
3656                 global $wgLegalTitleChars;
3657                 $tc = "[$wgLegalTitleChars]";
3658                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3659
3660                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3661                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3662                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3663
3664                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3665                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3666                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3667
3668                 $t = $this->mTitle->getText();
3669                 $m = array();
3670                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3671                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3672                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3673                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3674                 } else {
3675                         # if there's no context, don't bother duplicating the title
3676                         $text = preg_replace( $p2, '[[\\1]]', $text );
3677                 }
3678
3679                 # Trim trailing whitespace
3680                 $text = rtrim( $text );
3681
3682                 return $text;
3683         }
3684
3685         /**
3686          * Fetch the user's signature text, if any, and normalize to
3687          * validated, ready-to-insert wikitext.
3688          *
3689          * @param User $user
3690          * @return string
3691          * @private
3692          */
3693         function getUserSig( &$user ) {
3694                 global $wgMaxSigChars;
3695
3696                 $username = $user->getName();
3697                 $nickname = $user->getOption( 'nickname' );
3698                 $nickname = $nickname === '' ? $username : $nickname;
3699
3700                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3701                         $nickname = $username;
3702                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3703                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3704                         # Sig. might contain markup; validate this
3705                         if( $this->validateSig( $nickname ) !== false ) {
3706                                 # Validated; clean up (if needed) and return it
3707                                 return $this->cleanSig( $nickname, true );
3708                         } else {
3709                                 # Failed to validate; fall back to the default
3710                                 $nickname = $username;
3711                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3712                         }
3713                 }
3714
3715                 // Make sure nickname doesnt get a sig in a sig
3716                 $nickname = $this->cleanSigInSig( $nickname );
3717
3718                 # If we're still here, make it a link to the user page
3719                 $userText = wfEscapeWikiText( $username );
3720                 $nickText = wfEscapeWikiText( $nickname );
3721                 if ( $user->isAnon() )  {
3722                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3723                 } else {
3724                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3725                 }
3726         }
3727
3728         /**
3729          * Check that the user's signature contains no bad XML
3730          *
3731          * @param string $text
3732          * @return mixed An expanded string, or false if invalid.
3733          */
3734         function validateSig( $text ) {
3735                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3736         }
3737
3738         /**
3739          * Clean up signature text
3740          *
3741          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3742          * 2) Substitute all transclusions
3743          *
3744          * @param string $text
3745          * @param $parsing Whether we're cleaning (preferences save) or parsing
3746          * @return string Signature text
3747          */
3748         function cleanSig( $text, $parsing = false ) {
3749                 if ( !$parsing ) {
3750                         global $wgTitle;
3751                         $this->clearState();
3752                         $this->setTitle( $wgTitle );
3753                         $this->mOptions = new ParserOptions;
3754                         $this->setOutputType = self::OT_PREPROCESS;
3755                 }
3756
3757                 # FIXME: regex doesn't respect extension tags or nowiki
3758                 #  => Move this logic to braceSubstitution()
3759                 $substWord = MagicWord::get( 'subst' );
3760                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3761                 $substText = '{{' . $substWord->getSynonym( 0 );
3762
3763                 $text = preg_replace( $substRegex, $substText, $text );
3764                 $text = $this->cleanSigInSig( $text );
3765                 $dom = $this->preprocessToDom( $text );
3766                 $frame = $this->getPreprocessor()->newFrame();
3767                 $text = $frame->expand( $dom );
3768
3769                 if ( !$parsing ) {
3770                         $text = $this->mStripState->unstripBoth( $text );
3771                 }
3772
3773                 return $text;
3774         }
3775
3776         /**
3777          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3778          * @param string $text
3779          * @return string Signature text with /~{3,5}/ removed
3780          */
3781         function cleanSigInSig( $text ) {
3782                 $text = preg_replace( '/~{3,5}/', '', $text );
3783                 return $text;
3784         }
3785
3786         /**
3787          * Set up some variables which are usually set up in parse()
3788          * so that an external function can call some class members with confidence
3789          * @public
3790          */
3791         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3792                 $this->setTitle( $title );
3793                 $this->mOptions = $options;
3794                 $this->setOutputType( $outputType );
3795                 if ( $clearState ) {
3796                         $this->clearState();
3797                 }
3798         }
3799
3800         /**
3801          * Wrapper for preprocess()
3802          *
3803          * @param string $text the text to preprocess
3804          * @param ParserOptions $options  options
3805          * @return string
3806          * @public
3807          */
3808         function transformMsg( $text, $options ) {
3809                 global $wgTitle;
3810                 static $executing = false;
3811
3812                 $fname = "Parser::transformMsg";
3813
3814                 # Guard against infinite recursion
3815                 if ( $executing ) {
3816                         return $text;
3817                 }
3818                 $executing = true;
3819
3820                 wfProfileIn($fname);
3821                 $text = $this->preprocess( $text, $wgTitle, $options );
3822
3823                 $executing = false;
3824                 wfProfileOut($fname);
3825                 return $text;
3826         }
3827
3828         /**
3829          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3830          * The callback should have the following form:
3831          *    function myParserHook( $text, $params, &$parser ) { ... }
3832          *
3833          * Transform and return $text. Use $parser for any required context, e.g. use
3834          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3835          *
3836          * @public
3837          *
3838          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3839          * @param mixed $callback The callback function (and object) to use for the tag
3840          *
3841          * @return The old value of the mTagHooks array associated with the hook
3842          */
3843         function setHook( $tag, $callback ) {
3844                 $tag = strtolower( $tag );
3845                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3846                 $this->mTagHooks[$tag] = $callback;
3847                 if( !in_array( $tag, $this->mStripList ) ) {
3848                         $this->mStripList[] = $tag;
3849                 }
3850
3851                 return $oldVal;
3852         }
3853
3854         function setTransparentTagHook( $tag, $callback ) {
3855                 $tag = strtolower( $tag );
3856                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
3857                 $this->mTransparentTagHooks[$tag] = $callback;
3858
3859                 return $oldVal;
3860         }
3861
3862         /**
3863          * Remove all tag hooks
3864          */
3865         function clearTagHooks() {
3866                 $this->mTagHooks = array();
3867                 $this->mStripList = $this->mDefaultStripList;
3868         }
3869
3870         /**
3871          * Create a function, e.g. {{sum:1|2|3}}
3872          * The callback function should have the form:
3873          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3874          *
3875          * The callback may either return the text result of the function, or an array with the text
3876          * in element 0, and a number of flags in the other elements. The names of the flags are
3877          * specified in the keys. Valid flags are:
3878          *   found                     The text returned is valid, stop processing the template. This
3879          *                             is on by default.
3880          *   nowiki                    Wiki markup in the return value should be escaped
3881          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3882          *
3883          * @public
3884          *
3885          * @param string $id The magic word ID
3886          * @param mixed $callback The callback function (and object) to use
3887          * @param integer $flags a combination of the following flags:
3888          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3889          *
3890          * @return The old callback function for this name, if any
3891          */
3892         function setFunctionHook( $id, $callback, $flags = 0 ) {
3893                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
3894                 $this->mFunctionHooks[$id] = array( $callback, $flags );
3895
3896                 # Add to function cache
3897                 $mw = MagicWord::get( $id );
3898                 if( !$mw )
3899                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3900
3901                 $synonyms = $mw->getSynonyms();
3902                 $sensitive = intval( $mw->isCaseSensitive() );
3903
3904                 foreach ( $synonyms as $syn ) {
3905                         # Case
3906                         if ( !$sensitive ) {
3907                                 $syn = strtolower( $syn );
3908                         }
3909                         # Add leading hash
3910                         if ( !( $flags & SFH_NO_HASH ) ) {
3911                                 $syn = '#' . $syn;
3912                         }
3913                         # Remove trailing colon
3914                         if ( substr( $syn, -1, 1 ) == ':' ) {
3915                                 $syn = substr( $syn, 0, -1 );
3916                         }
3917                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3918                 }
3919                 return $oldVal;
3920         }
3921
3922         /**
3923          * Get all registered function hook identifiers
3924          *
3925          * @return array
3926          */
3927         function getFunctionHooks() {
3928                 return array_keys( $this->mFunctionHooks );
3929         }
3930
3931         /**
3932          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3933          * Placeholders created in Skin::makeLinkObj()
3934          * Returns an array of link CSS classes, indexed by PDBK.
3935          * $options is a bit field, RLH_FOR_UPDATE to select for update
3936          */
3937         function replaceLinkHolders( &$text, $options = 0 ) {
3938                 global $wgUser;
3939                 global $wgContLang;
3940
3941                 $fname = 'Parser::replaceLinkHolders';
3942                 wfProfileIn( $fname );
3943
3944                 $pdbks = array();
3945                 $colours = array();
3946                 $linkcolour_ids = array();
3947                 $sk = $this->mOptions->getSkin();
3948                 $linkCache =& LinkCache::singleton();
3949
3950                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3951                         wfProfileIn( $fname.'-check' );
3952                         $dbr = wfGetDB( DB_SLAVE );
3953                         $page = $dbr->tableName( 'page' );
3954                         $threshold = $wgUser->getOption('stubthreshold');
3955
3956                         # Sort by namespace
3957                         asort( $this->mLinkHolders['namespaces'] );
3958
3959                         # Generate query
3960                         $query = false;
3961                         $current = null;
3962                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3963                                 # Make title object
3964                                 $title = $this->mLinkHolders['titles'][$key];
3965
3966                                 # Skip invalid entries.
3967                                 # Result will be ugly, but prevents crash.
3968                                 if ( is_null( $title ) ) {
3969                                         continue;
3970                                 }
3971                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3972
3973                                 # Check if it's a static known link, e.g. interwiki
3974                                 if ( $title->isAlwaysKnown() ) {
3975                                         $colours[$pdbk] = '';
3976                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3977                                         $colours[$pdbk] = '';
3978                                         $this->mOutput->addLink( $title, $id );
3979                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3980                                         $colours[$pdbk] = 'new';
3981                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
3982                                         $colours[$pdbk] = 'new';
3983                                 } else {
3984                                         # Not in the link cache, add it to the query
3985                                         if ( !isset( $current ) ) {
3986                                                 $current = $ns;
3987                                                 $query =  "SELECT page_id, page_namespace, page_title, page_is_redirect";
3988                                                 if ( $threshold > 0 ) {
3989                                                         $query .= ', page_len';
3990                                                 }
3991                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3992                                         } elseif ( $current != $ns ) {
3993                                                 $current = $ns;
3994                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
3995                                         } else {
3996                                                 $query .= ', ';
3997                                         }
3998
3999                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4000                                 }
4001                         }
4002                         if ( $query ) {
4003                                 $query .= '))';
4004                                 if ( $options & RLH_FOR_UPDATE ) {
4005                                         $query .= ' FOR UPDATE';
4006                                 }
4007
4008                                 $res = $dbr->query( $query, $fname );
4009
4010                                 # Fetch data and form into an associative array
4011                                 # non-existent = broken
4012                                 while ( $s = $dbr->fetchObject($res) ) {
4013                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4014                                         $pdbk = $title->getPrefixedDBkey();
4015                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4016                                         $this->mOutput->addLink( $title, $s->page_id );
4017                                         $colours[$pdbk] = $sk->getLinkColour( $s, $threshold );
4018                                         //add id to the extension todolist
4019                                         $linkcolour_ids[$s->page_id] = $pdbk;
4020                                 }
4021                                 //pass an array of page_ids to an extension
4022                                 wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4023                         }
4024                         wfProfileOut( $fname.'-check' );
4025
4026                         # Do a second query for different language variants of links and categories
4027                         if($wgContLang->hasVariants()){
4028                                 $linkBatch = new LinkBatch();
4029                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4030                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4031                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4032
4033                                 $categories = $this->mOutput->getCategoryLinks();
4034
4035                                 // Add variants of links to link batch
4036                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4037                                         $title = $this->mLinkHolders['titles'][$key];
4038                                         if ( is_null( $title ) )
4039                                                 continue;
4040
4041                                         $pdbk = $title->getPrefixedDBkey();
4042                                         $titleText = $title->getText();
4043
4044                                         // generate all variants of the link title text
4045                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4046
4047                                         // if link was not found (in first query), add all variants to query
4048                                         if ( !isset($colours[$pdbk]) ){
4049                                                 foreach($allTextVariants as $textVariant){
4050                                                         if($textVariant != $titleText){
4051                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4052                                                                 if(is_null($variantTitle)) continue;
4053                                                                 $linkBatch->addObj( $variantTitle );
4054                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4055                                                         }
4056                                                 }
4057                                         }
4058                                 }
4059
4060                                 // process categories, check if a category exists in some variant
4061                                 foreach( $categories as $category ){
4062                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4063                                         foreach($variants as $variant){
4064                                                 if($variant != $category){
4065                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4066                                                         if(is_null($variantTitle)) continue;
4067                                                         $linkBatch->addObj( $variantTitle );
4068                                                         $categoryMap[$variant] = $category;
4069                                                 }
4070                                         }
4071                                 }
4072
4073
4074                                 if(!$linkBatch->isEmpty()){
4075                                         // construct query
4076                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4077
4078                                         $variantQuery =  "SELECT page_id, page_namespace, page_title, page_is_redirect";
4079                                         if ( $threshold > 0 ) {
4080                                                 $variantQuery .= ', page_len';
4081                                         }
4082
4083                                         $variantQuery .= " FROM $page WHERE $titleClause";
4084                                         if ( $options & RLH_FOR_UPDATE ) {
4085                                                 $variantQuery .= ' FOR UPDATE';
4086                                         }
4087
4088                                         $varRes = $dbr->query( $variantQuery, $fname );
4089
4090                                         // for each found variants, figure out link holders and replace
4091                                         while ( $s = $dbr->fetchObject($varRes) ) {
4092
4093                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4094                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4095                                                 $vardbk = $variantTitle->getDBkey();
4096
4097                                                 $holderKeys = array();
4098                                                 if(isset($variantMap[$varPdbk])){
4099                                                         $holderKeys = $variantMap[$varPdbk];
4100                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4101                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4102                                                 }
4103
4104                                                 // loop over link holders
4105                                                 foreach($holderKeys as $key){
4106                                                         $title = $this->mLinkHolders['titles'][$key];
4107                                                         if ( is_null( $title ) ) continue;
4108
4109                                                         $pdbk = $title->getPrefixedDBkey();
4110
4111                                                         if(!isset($colours[$pdbk])){
4112                                                                 // found link in some of the variants, replace the link holder data
4113                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4114                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4115
4116                                                                 // set pdbk and colour
4117                                                                 $pdbks[$key] = $varPdbk;
4118                                                                 $colours[$varPdbk] = $sk->getLinkColour( $s, $threshold );
4119                                                                 $linkcolour_ids[$s->page_id] = $pdbk;
4120                                                         }
4121                                                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4122                                                 }
4123
4124                                                 // check if the object is a variant of a category
4125                                                 if(isset($categoryMap[$vardbk])){
4126                                                         $oldkey = $categoryMap[$vardbk];
4127                                                         if($oldkey != $vardbk)
4128                                                                 $varCategories[$oldkey]=$vardbk;
4129                                                 }
4130                                         }
4131
4132                                         // rebuild the categories in original order (if there are replacements)
4133                                         if(count($varCategories)>0){
4134                                                 $newCats = array();
4135                                                 $originalCats = $this->mOutput->getCategories();
4136                                                 foreach($originalCats as $cat => $sortkey){
4137                                                         // make the replacement
4138                                                         if( array_key_exists($cat,$varCategories) )
4139                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4140                                                         else $newCats[$cat] = $sortkey;
4141                                                 }
4142                                                 $this->mOutput->setCategoryLinks($newCats);
4143                                         }
4144                                 }
4145                         }
4146
4147                         # Construct search and replace arrays
4148                         wfProfileIn( $fname.'-construct' );
4149                         $replacePairs = array();
4150                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4151                                 $pdbk = $pdbks[$key];
4152                                 $searchkey = "<!--LINK $key-->";
4153                                 $title = $this->mLinkHolders['titles'][$key];
4154                                 if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] == 'new' ) {
4155                                         $linkCache->addBadLinkObj( $title );
4156                                         $colours[$pdbk] = 'new';
4157                                         $this->mOutput->addLink( $title, 0 );
4158                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4159                                                                         $this->mLinkHolders['texts'][$key],
4160                                                                         $this->mLinkHolders['queries'][$key] );
4161                                 } else {
4162                                         $replacePairs[$searchkey] = $sk->makeColouredLinkObj( $title, $colours[$pdbk],
4163                                                                         $this->mLinkHolders['texts'][$key],
4164                                                                         $this->mLinkHolders['queries'][$key] );
4165                                 }
4166                         }
4167                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4168                         wfProfileOut( $fname.'-construct' );
4169
4170                         # Do the thing
4171                         wfProfileIn( $fname.'-replace' );
4172                         $text = preg_replace_callback(
4173                                 '/(<!--LINK .*?-->)/',
4174                                 $replacer->cb(),
4175                                 $text);
4176
4177                         wfProfileOut( $fname.'-replace' );
4178                 }
4179
4180                 # Now process interwiki link holders
4181                 # This is quite a bit simpler than internal links
4182                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4183                         wfProfileIn( $fname.'-interwiki' );
4184                         # Make interwiki link HTML
4185                         $replacePairs = array();
4186                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4187                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4188                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4189                         }
4190                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4191
4192                         $text = preg_replace_callback(
4193                                 '/<!--IWLINK (.*?)-->/',
4194                                 $replacer->cb(),
4195                                 $text );
4196                         wfProfileOut( $fname.'-interwiki' );
4197                 }
4198
4199                 wfProfileOut( $fname );
4200                 return $colours;
4201         }
4202
4203         /**
4204          * Replace <!--LINK--> link placeholders with plain text of links
4205          * (not HTML-formatted).
4206          * @param string $text
4207          * @return string
4208          */
4209         function replaceLinkHoldersText( $text ) {
4210                 $fname = 'Parser::replaceLinkHoldersText';
4211                 wfProfileIn( $fname );
4212
4213                 $text = preg_replace_callback(
4214                         '/<!--(LINK|IWLINK) (.*?)-->/',
4215                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4216                         $text );
4217
4218                 wfProfileOut( $fname );
4219                 return $text;
4220         }
4221
4222         /**
4223          * @param array $matches
4224          * @return string
4225          * @private
4226          */
4227         function replaceLinkHoldersTextCallback( $matches ) {
4228                 $type = $matches[1];
4229                 $key  = $matches[2];
4230                 if( $type == 'LINK' ) {
4231                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4232                                 return $this->mLinkHolders['texts'][$key];
4233                         }
4234                 } elseif( $type == 'IWLINK' ) {
4235                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4236                                 return $this->mInterwikiLinkHolders['texts'][$key];
4237                         }
4238                 }
4239                 return $matches[0];
4240         }
4241
4242         /**
4243          * Tag hook handler for 'pre'.
4244          */
4245         function renderPreTag( $text, $attribs ) {
4246                 // Backwards-compatibility hack
4247                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4248
4249                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4250                 return wfOpenElement( 'pre', $attribs ) .
4251                         Xml::escapeTagsOnly( $content ) .
4252                         '</pre>';
4253         }
4254
4255         /**
4256          * Renders an image gallery from a text with one line per image.
4257          * text labels may be given by using |-style alternative text. E.g.
4258          *   Image:one.jpg|The number "1"
4259          *   Image:tree.jpg|A tree
4260          * given as text will return the HTML of a gallery with two images,
4261          * labeled 'The number "1"' and
4262          * 'A tree'.
4263          */
4264         function renderImageGallery( $text, $params ) {
4265                 $ig = new ImageGallery();
4266                 $ig->setContextTitle( $this->mTitle );
4267                 $ig->setShowBytes( false );
4268                 $ig->setShowFilename( false );
4269                 $ig->setParser( $this );
4270                 $ig->setHideBadImages();
4271                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4272                 $ig->useSkin( $this->mOptions->getSkin() );
4273                 $ig->mRevisionId = $this->mRevisionId;
4274
4275                 if( isset( $params['caption'] ) ) {
4276                         $caption = $params['caption'];
4277                         $caption = htmlspecialchars( $caption );
4278                         $caption = $this->replaceInternalLinks( $caption );
4279                         $ig->setCaptionHtml( $caption );
4280                 }
4281                 if( isset( $params['perrow'] ) ) {
4282                         $ig->setPerRow( $params['perrow'] );
4283                 }
4284                 if( isset( $params['widths'] ) ) {
4285                         $ig->setWidths( $params['widths'] );
4286                 }
4287                 if( isset( $params['heights'] ) ) {
4288                         $ig->setHeights( $params['heights'] );
4289                 }
4290
4291                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4292
4293                 $lines = explode( "\n", $text );
4294                 foreach ( $lines as $line ) {
4295                         # match lines like these:
4296                         # Image:someimage.jpg|This is some image
4297                         $matches = array();
4298                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4299                         # Skip empty lines
4300                         if ( count( $matches ) == 0 ) {
4301                                 continue;
4302                         }
4303                         $tp = Title::newFromText( $matches[1] );
4304                         $nt =& $tp;
4305                         if( is_null( $nt ) ) {
4306                                 # Bogus title. Ignore these so we don't bomb out later.
4307                                 continue;
4308                         }
4309                         if ( isset( $matches[3] ) ) {
4310                                 $label = $matches[3];
4311                         } else {
4312                                 $label = '';
4313                         }
4314
4315                         $html = $this->recursiveTagParse( trim( $label ) );
4316
4317                         $ig->add( $nt, $html );
4318
4319                         # Only add real images (bug #5586)
4320                         if ( $nt->getNamespace() == NS_IMAGE ) {
4321                                 $this->mOutput->addImage( $nt->getDBkey() );
4322                         }
4323                 }
4324                 return $ig->toHTML();
4325         }
4326
4327         function getImageParams( $handler ) {
4328                 if ( $handler ) {
4329                         $handlerClass = get_class( $handler );
4330                 } else {
4331                         $handlerClass = '';
4332                 }
4333                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4334                         // Initialise static lists
4335                         static $internalParamNames = array(
4336                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4337                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4338                                         'bottom', 'text-bottom' ),
4339                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4340                                         'upright', 'border' ),
4341                         );
4342                         static $internalParamMap;
4343                         if ( !$internalParamMap ) {
4344                                 $internalParamMap = array();
4345                                 foreach ( $internalParamNames as $type => $names ) {
4346                                         foreach ( $names as $name ) {
4347                                                 $magicName = str_replace( '-', '_', "img_$name" );
4348                                                 $internalParamMap[$magicName] = array( $type, $name );
4349                                         }
4350                                 }
4351                         }
4352
4353                         // Add handler params
4354                         $paramMap = $internalParamMap;
4355                         if ( $handler ) {
4356                                 $handlerParamMap = $handler->getParamMap();
4357                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4358                                         $paramMap[$magic] = array( 'handler', $paramName );
4359                                 }
4360                         }
4361                         $this->mImageParams[$handlerClass] = $paramMap;
4362                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4363                 }
4364                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4365         }
4366
4367         /**
4368          * Parse image options text and use it to make an image
4369          */
4370         function makeImage( $title, $options ) {
4371                 # @TODO: let the MediaHandler specify its transform parameters
4372                 #
4373                 # Check if the options text is of the form "options|alt text"
4374                 # Options are:
4375                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4376                 #  * left               no resizing, just left align. label is used for alt= only
4377                 #  * right              same, but right aligned
4378                 #  * none               same, but not aligned
4379                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4380                 #  * center             center the image
4381                 #  * framed             Keep original image size, no magnify-button.
4382                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4383                 #  * upright            reduce width for upright images, rounded to full __0 px
4384                 #  * border             draw a 1px border around the image
4385                 # vertical-align values (no % or length right now):
4386                 #  * baseline
4387                 #  * sub
4388                 #  * super
4389                 #  * top
4390                 #  * text-top
4391                 #  * middle
4392                 #  * bottom
4393                 #  * text-bottom
4394
4395                 $parts = array_map( 'trim', explode( '|', $options) );
4396                 $sk = $this->mOptions->getSkin();
4397
4398                 # Give extensions a chance to select the file revision for us
4399                 $skip = $time = false;
4400                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4401
4402                 if ( $skip ) {
4403                         return $sk->makeLinkObj( $title );
4404                 }
4405
4406                 # Get parameter map
4407                 $file = wfFindFile( $title, $time );
4408                 $handler = $file ? $file->getHandler() : false;
4409
4410                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4411
4412                 # Process the input parameters
4413                 $caption = '';
4414                 $params = array( 'frame' => array(), 'handler' => array(),
4415                         'horizAlign' => array(), 'vertAlign' => array() );
4416                 foreach( $parts as $part ) {
4417                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4418                         if ( isset( $paramMap[$magicName] ) ) {
4419                                 list( $type, $paramName ) = $paramMap[$magicName];
4420                                 $params[$type][$paramName] = $value;
4421
4422                                 // Special case; width and height come in one variable together
4423                                 if( $type == 'handler' && $paramName == 'width' ) {
4424                                         $m = array();
4425                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4426                                                 $params[$type]['width'] = intval( $m[1] );
4427                                                 $params[$type]['height'] = intval( $m[2] );
4428                                         } else {
4429                                                 $params[$type]['width'] = intval( $value );
4430                                         }
4431                                 }
4432                         } else {
4433                                 $caption = $part;
4434                         }
4435                 }
4436
4437                 # Process alignment parameters
4438                 if ( $params['horizAlign'] ) {
4439                         $params['frame']['align'] = key( $params['horizAlign'] );
4440                 }
4441                 if ( $params['vertAlign'] ) {
4442                         $params['frame']['valign'] = key( $params['vertAlign'] );
4443                 }
4444
4445                 # Validate the handler parameters
4446                 if ( $handler ) {
4447                         foreach ( $params['handler'] as $name => $value ) {
4448                                 if ( !$handler->validateParam( $name, $value ) ) {
4449                                         unset( $params['handler'][$name] );
4450                                 }
4451                         }
4452                 }
4453
4454                 # Strip bad stuff out of the alt text
4455                 $alt = $this->replaceLinkHoldersText( $caption );
4456
4457                 # make sure there are no placeholders in thumbnail attributes
4458                 # that are later expanded to html- so expand them now and
4459                 # remove the tags
4460                 $alt = $this->mStripState->unstripBoth( $alt );
4461                 $alt = Sanitizer::stripAllTags( $alt );
4462
4463                 $params['frame']['alt'] = $alt;
4464                 $params['frame']['caption'] = $caption;
4465
4466                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4467
4468                 # Linker does the rest
4469                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time );
4470
4471                 # Give the handler a chance to modify the parser object
4472                 if ( $handler ) {
4473                         $handler->parserTransformHook( $this, $file );
4474                 }
4475
4476                 return $ret;
4477         }
4478
4479         /**
4480          * Set a flag in the output object indicating that the content is dynamic and
4481          * shouldn't be cached.
4482          */
4483         function disableCache() {
4484                 wfDebug( "Parser output marked as uncacheable.\n" );
4485                 $this->mOutput->mCacheTime = -1;
4486         }
4487
4488         /**#@+
4489          * Callback from the Sanitizer for expanding items found in HTML attribute
4490          * values, so they can be safely tested and escaped.
4491          * @param string $text
4492          * @param PPFrame $frame
4493          * @return string
4494          * @private
4495          */
4496         function attributeStripCallback( &$text, $frame = false ) {
4497                 $text = $this->replaceVariables( $text, $frame );
4498                 $text = $this->mStripState->unstripBoth( $text );
4499                 return $text;
4500         }
4501
4502         /**#@-*/
4503
4504         /**#@+
4505          * Accessor/mutator
4506          */
4507         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4508         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4509         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4510         /**#@-*/
4511
4512         /**#@+
4513          * Accessor
4514          */
4515         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4516         /**#@-*/
4517
4518
4519         /**
4520          * Break wikitext input into sections, and either pull or replace
4521          * some particular section's text.
4522          *
4523          * External callers should use the getSection and replaceSection methods.
4524          *
4525          * @param string $text Page wikitext
4526          * @param string $section A section identifier string of the form:
4527          *   <flag1> - <flag2> - ... - <section number>
4528          *
4529          * Currently the only recognised flag is "T", which means the target section number
4530          * was derived during a template inclusion parse, in other words this is a template
4531          * section edit link. If no flags are given, it was an ordinary section edit link.
4532          * This flag is required to avoid a section numbering mismatch when a section is
4533          * enclosed by <includeonly> (bug 6563).
4534          *
4535          * The section number 0 pulls the text before the first heading; other numbers will
4536          * pull the given section along with its lower-level subsections. If the section is
4537          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4538          *
4539          * @param string $mode One of "get" or "replace"
4540          * @param string $newText Replacement text for section data.
4541          * @return string for "get", the extracted section text.
4542          *                for "replace", the whole page with the section replaced.
4543          */
4544         private function extractSections( $text, $section, $mode, $newText='' ) {
4545                 global $wgTitle;
4546                 $this->clearState();
4547                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4548                 $this->mOptions = new ParserOptions;
4549                 $this->setOutputType( self::OT_WIKI );
4550                 $outText = '';
4551                 $frame = $this->getPreprocessor()->newFrame();
4552
4553                 // Process section extraction flags
4554                 $flags = 0;
4555                 $sectionParts = explode( '-', $section );
4556                 $sectionIndex = array_pop( $sectionParts );
4557                 foreach ( $sectionParts as $part ) {
4558                         if ( $part == 'T' ) {
4559                                 $flags |= self::PTD_FOR_INCLUSION;
4560                         }
4561                 }
4562                 // Preprocess the text
4563                 $root = $this->preprocessToDom( $text, $flags );
4564
4565                 // <h> nodes indicate section breaks
4566                 // They can only occur at the top level, so we can find them by iterating the root's children
4567                 $node = $root->getFirstChild();
4568
4569                 // Find the target section
4570                 if ( $sectionIndex == 0 ) {
4571                         // Section zero doesn't nest, level=big
4572                         $targetLevel = 1000;
4573                 } else {
4574             while ( $node ) {
4575                 if ( $node->getName() == 'h' ) {
4576                     $bits = $node->splitHeading();
4577                                         if ( $bits['i'] == $sectionIndex ) {
4578                                         $targetLevel = $bits['level'];
4579                                                 break;
4580                                         }
4581                                 }
4582                                 if ( $mode == 'replace' ) {
4583                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4584                                 }
4585                                 $node = $node->getNextSibling();
4586                         }
4587                 }
4588
4589                 if ( !$node ) {
4590                         // Not found
4591                         if ( $mode == 'get' ) {
4592                                 return $newText;
4593                         } else {
4594                                 return $text;
4595                         }
4596                 }
4597
4598                 // Find the end of the section, including nested sections
4599                 do {
4600                         if ( $node->getName() == 'h' ) {
4601                                 $bits = $node->splitHeading();
4602                                 $curLevel = $bits['level'];
4603                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4604                                         break;
4605                                 }
4606                         }
4607                         if ( $mode == 'get' ) {
4608                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4609                         }
4610                         $node = $node->getNextSibling();
4611                 } while ( $node );
4612
4613                 // Write out the remainder (in replace mode only)
4614                 if ( $mode == 'replace' ) {
4615                         // Output the replacement text
4616                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4617                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4618                         $outText .= $newText . "\n\n";
4619                         while ( $node ) {
4620                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4621                                 $node = $node->getNextSibling();
4622                         }
4623                 }
4624
4625                 if ( is_string( $outText ) ) {
4626                         // Re-insert stripped tags
4627                         $outText = trim( $this->mStripState->unstripBoth( $outText ) );
4628                 }
4629
4630                 return $outText;
4631         }
4632
4633         /**
4634          * This function returns the text of a section, specified by a number ($section).
4635          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4636          * the first section before any such heading (section 0).
4637          *
4638          * If a section contains subsections, these are also returned.
4639          *
4640          * @param string $text text to look in
4641          * @param string $section section identifier
4642          * @param string $deftext default to return if section is not found
4643          * @return string text of the requested section
4644          */
4645         public function getSection( $text, $section, $deftext='' ) {
4646                 return $this->extractSections( $text, $section, "get", $deftext );
4647         }
4648
4649         public function replaceSection( $oldtext, $section, $text ) {
4650                 return $this->extractSections( $oldtext, $section, "replace", $text );
4651         }
4652
4653         /**
4654          * Get the timestamp associated with the current revision, adjusted for
4655          * the default server-local timestamp
4656          */
4657         function getRevisionTimestamp() {
4658                 if ( is_null( $this->mRevisionTimestamp ) ) {
4659                         wfProfileIn( __METHOD__ );
4660                         global $wgContLang;
4661                         $dbr = wfGetDB( DB_SLAVE );
4662                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4663                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4664
4665                         // Normalize timestamp to internal MW format for timezone processing.
4666                         // This has the added side-effect of replacing a null value with
4667                         // the current time, which gives us more sensible behavior for
4668                         // previews.
4669                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4670
4671                         // The cryptic '' timezone parameter tells to use the site-default
4672                         // timezone offset instead of the user settings.
4673                         //
4674                         // Since this value will be saved into the parser cache, served
4675                         // to other users, and potentially even used inside links and such,
4676                         // it needs to be consistent for all visitors.
4677                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4678
4679                         wfProfileOut( __METHOD__ );
4680                 }
4681                 return $this->mRevisionTimestamp;
4682         }
4683
4684         /**
4685          * Mutator for $mDefaultSort
4686          *
4687          * @param $sort New value
4688          */
4689         public function setDefaultSort( $sort ) {
4690                 $this->mDefaultSort = $sort;
4691         }
4692
4693         /**
4694          * Accessor for $mDefaultSort
4695          * Will use the title/prefixed title if none is set
4696          *
4697          * @return string
4698          */
4699         public function getDefaultSort() {
4700                 if( $this->mDefaultSort !== false ) {
4701                         return $this->mDefaultSort;
4702                 } else {
4703                         return $this->mTitle->getNamespace() == NS_CATEGORY
4704                                         ? $this->mTitle->getText()
4705                                         : $this->mTitle->getPrefixedText();
4706                 }
4707         }
4708
4709         /**
4710          * Try to guess the section anchor name based on a wikitext fragment
4711          * presumably extracted from a heading, for example "Header" from
4712          * "== Header ==".
4713          */
4714         public function guessSectionNameFromWikiText( $text ) {
4715                 # Strip out wikitext links(they break the anchor)
4716                 $text = $this->stripSectionName( $text );
4717                 $headline = Sanitizer::decodeCharReferences( $text );
4718                 # strip out HTML
4719                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4720                 $headline = trim( $headline );
4721                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4722                 $replacearray = array(
4723                         '%3A' => ':',
4724                         '%' => '.'
4725                 );
4726                 return str_replace(
4727                         array_keys( $replacearray ),
4728                         array_values( $replacearray ),
4729                         $sectionanchor );
4730         }
4731
4732         /**
4733          * Strips a text string of wikitext for use in a section anchor
4734          *
4735          * Accepts a text string and then removes all wikitext from the
4736          * string and leaves only the resultant text (i.e. the result of
4737          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4738          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4739          * to create valid section anchors by mimicing the output of the
4740          * parser when headings are parsed.
4741          *
4742          * @param $text string Text string to be stripped of wikitext
4743          * for use in a Section anchor
4744          * @return Filtered text string
4745          */
4746         public function stripSectionName( $text ) {
4747                 # Strip internal link markup
4748                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4749                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4750
4751                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4752                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4753                 # on how many empty links there are on the page - need to figure that out.
4754                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4755
4756                 # Parse wikitext quotes (italics & bold)
4757                 $text = $this->doQuotes($text);
4758
4759                 # Strip HTML tags
4760                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4761                 return $text;
4762         }
4763
4764         function srvus( $text ) {
4765                 return $this->testSrvus( $text, $this->mOutputType );
4766         }
4767
4768         /**
4769          * strip/replaceVariables/unstrip for preprocessor regression testing
4770          */
4771         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
4772                 $this->clearState();
4773                 if ( ! ( $title instanceof Title ) ) {
4774                         $title = Title::newFromText( $title );
4775                 }
4776                 $this->mTitle = $title;
4777                 $this->mOptions = $options;
4778                 $this->setOutputType( $outputType );
4779                 $text = $this->replaceVariables( $text );
4780                 $text = $this->mStripState->unstripBoth( $text );
4781                 $text = Sanitizer::removeHTMLtags( $text );
4782                 return $text;
4783         }
4784
4785         function testPst( $text, $title, $options ) {
4786                 global $wgUser;
4787                 if ( ! ( $title instanceof Title ) ) {
4788                         $title = Title::newFromText( $title );
4789                 }
4790                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
4791         }
4792
4793         function testPreprocess( $text, $title, $options ) {
4794                 if ( ! ( $title instanceof Title ) ) {
4795                         $title = Title::newFromText( $title );
4796                 }
4797                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
4798         }
4799
4800         function markerSkipCallback( $s, $callback ) {
4801                 $i = 0;
4802                 $out = '';
4803                 while ( $i < strlen( $s ) ) {
4804                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
4805                         if ( $markerStart === false ) {
4806                                 $out .= call_user_func( $callback, substr( $s, $i ) );
4807                                 break;
4808                         } else {
4809                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
4810                                 $markerEnd = strpos( $s, $this->mMarkerSuffix, $markerStart );
4811                                 if ( $markerEnd === false ) {
4812                                         $out .= substr( $s, $markerStart );
4813                                         break;
4814                                 } else {
4815                                         $markerEnd += strlen( $this->mMarkerSuffix );
4816                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
4817                                         $i = $markerEnd;
4818                                 }
4819                         }
4820                 }
4821                 return $out;
4822         }
4823 }
4824
4825 /**
4826  * @todo document, briefly.
4827  * @addtogroup Parser
4828  */
4829 class StripState {
4830         var $general, $nowiki;
4831
4832         function __construct() {
4833                 $this->general = new ReplacementArray;
4834                 $this->nowiki = new ReplacementArray;
4835         }
4836
4837         function unstripGeneral( $text ) {
4838                 wfProfileIn( __METHOD__ );
4839                 do {
4840                         $oldText = $text;
4841                         $text = $this->general->replace( $text );
4842                 } while ( $text != $oldText );
4843                 wfProfileOut( __METHOD__ );
4844                 return $text;
4845         }
4846
4847         function unstripNoWiki( $text ) {
4848                 wfProfileIn( __METHOD__ );
4849                 do {
4850                         $oldText = $text;
4851                         $text = $this->nowiki->replace( $text );
4852                 } while ( $text != $oldText );
4853                 wfProfileOut( __METHOD__ );
4854                 return $text;
4855         }
4856
4857         function unstripBoth( $text ) {
4858                 wfProfileIn( __METHOD__ );
4859                 do {
4860                         $oldText = $text;
4861                         $text = $this->general->replace( $text );
4862                         $text = $this->nowiki->replace( $text );
4863                 } while ( $text != $oldText );
4864                 wfProfileOut( __METHOD__ );
4865                 return $text;
4866         }
4867 }
4868
4869 /**
4870  * @todo document, briefly.
4871  * @addtogroup Parser
4872  */
4873 class OnlyIncludeReplacer {
4874         var $output = '';
4875
4876         function replace( $matches ) {
4877                 if ( substr( $matches[1], -1 ) == "\n" ) {
4878                         $this->output .= substr( $matches[1], 0, -1 );
4879                 } else {
4880                         $this->output .= $matches[1];
4881                 }
4882         }
4883 }
4884