includes/parser/Parser.php

   1 <?php
   2 /**
   3  * @defgroup Parser Parser
   4  *
   5  * @file
   6  * @ingroup Parser
   7  * File for Parser and related classes
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * preprocess()
  24  *   removes HTML comments and expands templates
  25  * cleanSig()
  26  *   Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *   Extracts sections from an article for section editing
  29  *
  30  * Globals used:
  31  *    objects:   $wgLang, $wgContLang
  32  *
  33  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  34  *
  35  * settings:
  36  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  37  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  38  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  39  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @ingroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  65
  66         // State constants for the definition list colon extraction
  67         const COLON_STATE_TEXT = 0;
  68         const COLON_STATE_TAG = 1;
  69         const COLON_STATE_TAGSTART = 2;
  70         const COLON_STATE_CLOSETAG = 3;
  71         const COLON_STATE_TAGSLASH = 4;
  72         const COLON_STATE_COMMENT = 5;
  73         const COLON_STATE_COMMENTDASH = 6;
  74         const COLON_STATE_COMMENTDASHDASH = 7;
  75
  76         // Flags for preprocessToDom
  77         const PTD_FOR_INCLUSION = 1;
  78
  79         // Allowed values for $this->mOutputType
  80         // Parameter to startExternalParse().
  81         const OT_HTML = 1;
  82         const OT_WIKI = 2;
  83         const OT_PREPROCESS = 3;
  84         const OT_MSG = 3;
  85
  86         // Marker Suffix needs to be accessible staticly.
  87         const MARKER_SUFFIX = "-QINU\x7f";
  88
  89         /**#@+
  90          * @private
  91          */
  92         # Persistent:
  93         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  94                 $mSubstWords, $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerIndex,
  95                 $mPreprocessor, $mExtLinkBracketedRegex, $mUrlProtocols, $mDefaultStripList,
  96                 $mVarCache, $mConf, $mFunctionTagHooks;
  97
  98
  99         # Cleared with clearState():
 100         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 101         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 102         var $mLinkHolders, $mLinkID;
 103         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 104         var $mTplExpandCache; // empty-frame expansion cache
 105         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 106         var $mExpensiveFunctionCount; // number of expensive parser function calls
 107
 108         # Temporary
 109         # These are variables reset at least once per parse regardless of $clearState
 110         var $mOptions,      // ParserOptions object
 111                 $mTitle,        // Title context, used for self-link rendering and similar things
 112                 $mOutputType,   // Output type, one of the OT_xxx constants
 113                 $ot,            // Shortcut alias, see setOutputType()
 114                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 115                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 116                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 117
 118         /**#@-*/
 119
 120         /**
 121          * Constructor
 122          *
 123          * @public
 124          */
 125         function __construct( $conf = array() ) {
 126                 $this->mConf = $conf;
 127                 $this->mTagHooks = array();
 128                 $this->mTransparentTagHooks = array();
 129                 $this->mFunctionHooks = array();
 130                 $this->mFunctionTagHooks = array();
 131                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 132                 $this->mDefaultStripList = $this->mStripList = array();
 133                 $this->mUrlProtocols = wfUrlProtocols();
 134                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 135                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 136                 $this->mVarCache = array();
 137                 if ( isset( $conf['preprocessorClass'] ) ) {
 138                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 139                 } elseif ( extension_loaded( 'domxml' ) ) {
 140                         // PECL extension that conflicts with the core DOM extension (bug 13770)
 141                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 142                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 143                 } elseif ( extension_loaded( 'dom' ) ) {
 144                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 145                 } else {
 146                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 147                 }
 148                 $this->mMarkerIndex = 0;
 149                 $this->mFirstCall = true;
 150         }
 151
 152         /**
 153          * Reduce memory usage to reduce the impact of circular references
 154          */
 155         function __destruct() {
 156                 if ( isset( $this->mLinkHolders ) ) {
 157                         $this->mLinkHolders->__destruct();
 158                 }
 159                 foreach ( $this as $name => $value ) {
 160                         unset( $this->$name );
 161                 }
 162         }
 163
 164         /**
 165          * Do various kinds of initialisation on the first call of the parser
 166          */
 167         function firstCallInit() {
 168                 if ( !$this->mFirstCall ) {
 169                         return;
 170                 }
 171                 $this->mFirstCall = false;
 172
 173                 wfProfileIn( __METHOD__ );
 174
 175                 CoreParserFunctions::register( $this );
 176                 CoreTagHooks::register( $this );
 177                 $this->initialiseVariables();
 178
 179                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 180                 wfProfileOut( __METHOD__ );
 181         }
 182
 183         /**
 184          * Clear Parser state
 185          *
 186          * @private
 187          */
 188         function clearState() {
 189                 wfProfileIn( __METHOD__ );
 190                 if ( $this->mFirstCall ) {
 191                         $this->firstCallInit();
 192                 }
 193                 $this->mOutput = new ParserOutput;
 194                 $this->mAutonumber = 0;
 195                 $this->mLastSection = '';
 196                 $this->mDTopen = false;
 197                 $this->mIncludeCount = array();
 198                 $this->mStripState = new StripState;
 199                 $this->mArgStack = false;
 200                 $this->mInPre = false;
 201                 $this->mLinkHolders = new LinkHolderArray( $this );
 202                 $this->mLinkID = 0;
 203                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 204                 $this->mVarCache = array();
 205
 206                 /**
 207                  * Prefix for temporary replacement strings for the multipass parser.
 208                  * \x07 should never appear in input as it's disallowed in XML.
 209                  * Using it at the front also gives us a little extra robustness
 210                  * since it shouldn't match when butted up against identifier-like
 211                  * string constructs.
 212                  *
 213                  * Must not consist of all title characters, or else it will change
 214                  * the behaviour of <nowiki> in a link.
 215                  */
 216                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 217                 # Changed to \x7f to allow XML double-parsing -- TS
 218                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 219
 220
 221                 # Clear these on every parse, bug 4549
 222                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 223
 224                 $this->mShowToc = true;
 225                 $this->mForceTocPosition = false;
 226                 $this->mIncludeSizes = array(
 227                         'post-expand' => 0,
 228                         'arg' => 0,
 229                 );
 230                 $this->mPPNodeCount = 0;
 231                 $this->mDefaultSort = false;
 232                 $this->mHeadings = array();
 233                 $this->mDoubleUnderscores = array();
 234                 $this->mExpensiveFunctionCount = 0;
 235
 236                 # Fix cloning
 237                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 238                         $this->mPreprocessor = null;
 239                 }
 240
 241                 wfRunHooks( 'ParserClearState', array( &$this ) );
 242                 wfProfileOut( __METHOD__ );
 243         }
 244
 245         function setOutputType( $ot ) {
 246                 $this->mOutputType = $ot;
 247                 // Shortcut alias
 248                 $this->ot = array(
 249                         'html' => $ot == self::OT_HTML,
 250                         'wiki' => $ot == self::OT_WIKI,
 251                         'pre' => $ot == self::OT_PREPROCESS,
 252                 );
 253         }
 254
 255         /**
 256          * Set the context title
 257          */
 258         function setTitle( $t ) {
 259                 if ( !$t || $t instanceof FakeTitle ) {
 260                         $t = Title::newFromText( 'NO TITLE' );
 261                 }
 262
 263                 if ( strval( $t->getFragment() ) !== '' ) {
 264                         # Strip the fragment to avoid various odd effects
 265                         $this->mTitle = clone $t;
 266                         $this->mTitle->setFragment( '' );
 267                 } else {
 268                         $this->mTitle = $t;
 269                 }
 270         }
 271
 272         /**
 273          * Accessor for mUniqPrefix.
 274          *
 275          * @public
 276          */
 277         function uniqPrefix() {
 278                 if( !isset( $this->mUniqPrefix ) ) {
 279                         // @todo Fixme: this is probably *horribly wrong*
 280                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 281                         // if this is called for a parser cache hit, the parser may not
 282                         // have ever been initialized in the first place.
 283                         // Not really sure what the heck is supposed to be going on here.
 284                         return '';
 285                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 286                 }
 287                 return $this->mUniqPrefix;
 288         }
 289
 290         /**
 291          * Convert wikitext to HTML
 292          * Do not call this function recursively.
 293          *
 294          * @param $text String: text we want to parse
 295          * @param $title A title object
 296          * @param $options ParserOptions
 297          * @param $linestart boolean
 298          * @param $clearState boolean
 299          * @param $revid Int: number to pass in {{REVISIONID}}
 300          * @return ParserOutput a ParserOutput
 301          */
 302         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 303                 /**
 304                  * First pass--just handle <nowiki> sections, pass the rest off
 305                  * to internalParse() which does all the real work.
 306                  */
 307
 308                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang, $wgDisableLangConversion;
 309                 $fname = __METHOD__.'-' . wfGetCaller();
 310                 wfProfileIn( __METHOD__ );
 311                 wfProfileIn( $fname );
 312
 313                 if ( $clearState ) {
 314                         $this->clearState();
 315                 }
 316
 317                 $this->mOptions = $options;
 318                 $this->setTitle( $title ); // Page title has to be set for the pre-processor
 319
 320                 $oldRevisionId = $this->mRevisionId;
 321                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 322                 if( $revid !== null ) {
 323                         $this->mRevisionId = $revid;
 324                         $this->mRevisionTimestamp = null;
 325                 }
 326                 $this->setOutputType( self::OT_HTML );
 327                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 328                 # No more strip!
 329                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 330                 $text = $this->internalParse( $text );
 331
 332                 $text = $this->mStripState->unstripGeneral( $text );
 333
 334                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 335                 $fixtags = array(
 336                         # french spaces, last one Guillemet-left
 337                         # only if there is something before the space
 338                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 339                         # french spaces, Guillemet-right
 340                         '/(\\302\\253) /' => '\\1&nbsp;',
 341                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 342                 );
 343                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 344
 345                 $text = $this->doBlockLevels( $text, $linestart );
 346
 347                 $this->replaceLinkHolders( $text );
 348
 349                 // The position of the convert() call should not be changed. it
 350                 // assumes that the links are all replaced and the only thing left
 351                 // is the <nowiki> mark.
 352                 if ( !( $wgDisableLangConversion
 353                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 354                                 || $this->mTitle->isTalkPage()
 355                                 || $this->mTitle->isConversionTable() ) ) {
 356                         $text = $wgContLang->convert( $text );
 357                 }
 358
 359                 // A title may have been set in a conversion rule.
 360                 // Note that if a user tries to set a title in a conversion
 361                 // rule but content conversion was not done, then the parser
 362                 // won't pick it up.  This is probably expected behavior.
 363                 if ( $wgContLang->getConvRuleTitle() ) {
 364                         $this->mOutput->setTitleText( $wgContLang->getConvRuleTitle() );
 365                 }
 366
 367                 $text = $this->mStripState->unstripNoWiki( $text );
 368
 369                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 370
 371 //!JF Move to its own function
 372
 373                 $uniq_prefix = $this->mUniqPrefix;
 374                 $matches = array();
 375                 $elements = array_keys( $this->mTransparentTagHooks );
 376                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 377
 378                 foreach( $matches as $marker => $data ) {
 379                         list( $element, $content, $params, $tag ) = $data;
 380                         $tagName = strtolower( $element );
 381                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 382                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 383                                         array( $content, $params, $this ) );
 384                         } else {
 385                                 $output = $tag;
 386                         }
 387                         $this->mStripState->general->setPair( $marker, $output );
 388                 }
 389                 $text = $this->mStripState->unstripGeneral( $text );
 390
 391                 $text = Sanitizer::normalizeCharReferences( $text );
 392
 393                 if ( ( $wgUseTidy && $this->mOptions->mTidy ) || $wgAlwaysUseTidy ) {
 394                         $text = MWTidy::tidy( $text );
 395                 } else {
 396                         # attempt to sanitize at least some nesting problems
 397                         # (bug #2702 and quite a few others)
 398                         $tidyregs = array(
 399                                 # ''Something [http://www.cool.com cool''] -->
 400                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 401                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 402                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 403                                 # fix up an anchor inside another anchor, only
 404                                 # at least for a single single nested link (bug 3695)
 405                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 406                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 407                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 408                                 # contains a div, so fix it up here; replace
 409                                 # div with escaped text
 410                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 411                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 412                                 # remove empty italic or bold tag pairs, some
 413                                 # introduced by rules above
 414                                 '/<([bi])><\/\\1>/' => '',
 415                         );
 416
 417                         $text = preg_replace(
 418                                 array_keys( $tidyregs ),
 419                                 array_values( $tidyregs ),
 420                                 $text );
 421                 }
 422                 global $wgExpensiveParserFunctionLimit;
 423                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 424                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 425                 }
 426
 427                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 428
 429                 # Information on include size limits, for the benefit of users who try to skirt them
 430                 if ( $this->mOptions->getEnableLimitReport() ) {
 431                         $max = $this->mOptions->getMaxIncludeSize();
 432                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 433                         $limitReport =
 434                                 "NewPP limit report\n" .
 435                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 436                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 437                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 438                                 $PFreport;
 439                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 440                         $text .= "\n<!-- \n$limitReport-->\n";
 441                 }
 442                 $this->mOutput->setText( $text );
 443
 444                 $this->mRevisionId = $oldRevisionId;
 445                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 446                 wfProfileOut( $fname );
 447                 wfProfileOut( __METHOD__ );
 448
 449                 return $this->mOutput;
 450         }
 451
 452         /**
 453          * Recursive parser entry point that can be called from an extension tag
 454          * hook.
 455          *
 456          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 457          *
 458          * @param $text String: text extension wants to have parsed
 459          * @param PPFrame $frame: The frame to use for expanding any template variables
 460          */
 461         function recursiveTagParse( $text, $frame=false ) {
 462                 wfProfileIn( __METHOD__ );
 463                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 464                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 465                 $text = $this->internalParse( $text, false, $frame );
 466                 wfProfileOut( __METHOD__ );
 467                 return $text;
 468         }
 469
 470         /**
 471          * Expand templates and variables in the text, producing valid, static wikitext.
 472          * Also removes comments.
 473          */
 474         function preprocess( $text, $title, $options, $revid = null ) {
 475                 wfProfileIn( __METHOD__ );
 476                 $this->clearState();
 477                 $this->setOutputType( self::OT_PREPROCESS );
 478                 $this->mOptions = $options;
 479                 $this->setTitle( $title );
 480                 if( $revid !== null ) {
 481                         $this->mRevisionId = $revid;
 482                 }
 483                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 484                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 485                 $text = $this->replaceVariables( $text );
 486                 $text = $this->mStripState->unstripBoth( $text );
 487                 wfProfileOut( __METHOD__ );
 488                 return $text;
 489         }
 490
 491         /**
 492          * Get a random string
 493          *
 494          * @private
 495          * @static
 496          */
 497         function getRandomString() {
 498                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 499         }
 500
 501         function &getTitle() { return $this->mTitle; }
 502         function getOptions() { return $this->mOptions; }
 503         function getRevisionId() { return $this->mRevisionId; }
 504         function getOutput() { return $this->mOutput; }
 505         function nextLinkID() { return $this->mLinkID++; }
 506
 507         function getFunctionLang() {
 508                 global $wgLang, $wgContLang;
 509
 510                 $target = $this->mOptions->getTargetLanguage();
 511                 if ( $target !== null ) {
 512                         return $target;
 513                 } else {
 514                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 515                 }
 516         }
 517
 518         /**
 519          * Get a preprocessor object
 520          */
 521         function getPreprocessor() {
 522                 if ( !isset( $this->mPreprocessor ) ) {
 523                         $class = $this->mPreprocessorClass;
 524                         $this->mPreprocessor = new $class( $this );
 525                 }
 526                 return $this->mPreprocessor;
 527         }
 528
 529         /**
 530          * Replaces all occurrences of HTML-style comments and the given tags
 531          * in the text with a random marker and returns the next text. The output
 532          * parameter $matches will be an associative array filled with data in
 533          * the form:
 534          *   'UNIQ-xxxxx' => array(
 535          *     'element',
 536          *     'tag content',
 537          *     array( 'param' => 'x' ),
 538          *     '<element param="x">tag content</element>' ) )
 539          *
 540          * @param $elements list of element names. Comments are always extracted.
 541          * @param $text Source text string.
 542          * @param $uniq_prefix
 543          *
 544          * @public
 545          * @static
 546          */
 547         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 548                 static $n = 1;
 549                 $stripped = '';
 550                 $matches = array();
 551
 552                 $taglist = implode( '|', $elements );
 553                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 554
 555                 while ( $text != '' ) {
 556                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 557                         $stripped .= $p[0];
 558                         if( count( $p ) < 5 ) {
 559                                 break;
 560                         }
 561                         if( count( $p ) > 5 ) {
 562                                 // comment
 563                                 $element    = $p[4];
 564                                 $attributes = '';
 565                                 $close      = '';
 566                                 $inside     = $p[5];
 567                         } else {
 568                                 // tag
 569                                 $element    = $p[1];
 570                                 $attributes = $p[2];
 571                                 $close      = $p[3];
 572                                 $inside     = $p[4];
 573                         }
 574
 575                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 576                         $stripped .= $marker;
 577
 578                         if ( $close === '/>' ) {
 579                                 // Empty element tag, <tag />
 580                                 $content = null;
 581                                 $text = $inside;
 582                                 $tail = null;
 583                         } else {
 584                                 if( $element === '!--' ) {
 585                                         $end = '/(-->)/';
 586                                 } else {
 587                                         $end = "/(<\\/$element\\s*>)/i";
 588                                 }
 589                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 590                                 $content = $q[0];
 591                                 if( count( $q ) < 3 ) {
 592                                         # No end tag -- let it run out to the end of the text.
 593                                         $tail = '';
 594                                         $text = '';
 595                                 } else {
 596                                         $tail = $q[1];
 597                                         $text = $q[2];
 598                                 }
 599                         }
 600
 601                         $matches[$marker] = array( $element,
 602                                 $content,
 603                                 Sanitizer::decodeTagAttributes( $attributes ),
 604                                 "<$element$attributes$close$content$tail" );
 605                 }
 606                 return $stripped;
 607         }
 608
 609         /**
 610          * Get a list of strippable XML-like elements
 611          */
 612         function getStripList() {
 613                 return $this->mStripList;
 614         }
 615
 616         /**
 617          * @deprecated use replaceVariables
 618          */
 619         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 620                 return $text;
 621         }
 622
 623         /**
 624          * Restores pre, math, and other extensions removed by strip()
 625          *
 626          * always call unstripNoWiki() after this one
 627          * @private
 628          * @deprecated use $this->mStripState->unstrip()
 629          */
 630         function unstrip( $text, $state ) {
 631                 return $state->unstripGeneral( $text );
 632         }
 633
 634         /**
 635          * Always call this after unstrip() to preserve the order
 636          *
 637          * @private
 638          * @deprecated use $this->mStripState->unstrip()
 639          */
 640         function unstripNoWiki( $text, $state ) {
 641                 return $state->unstripNoWiki( $text );
 642         }
 643
 644         /**
 645          * @deprecated use $this->mStripState->unstripBoth()
 646          */
 647         function unstripForHTML( $text ) {
 648                 return $this->mStripState->unstripBoth( $text );
 649         }
 650
 651         /**
 652          * Add an item to the strip state
 653          * Returns the unique tag which must be inserted into the stripped text
 654          * The tag will be replaced with the original text in unstrip()
 655          *
 656          * @private
 657          */
 658         function insertStripItem( $text ) {
 659                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 660                 $this->mMarkerIndex++;
 661                 $this->mStripState->general->setPair( $rnd, $text );
 662                 return $rnd;
 663         }
 664
 665         /**
 666          * Interface with html tidy
 667          * @deprecated Use MWTidy::tidy()
 668          */
 669         public static function tidy( $text ) {
 670                 wfDeprecated( __METHOD__ );
 671                 return MWTidy::tidy( $text );
 672         }
 673
 674         /**
 675          * parse the wiki syntax used to render tables
 676          *
 677          * @private
 678          */
 679         function doTableStuff ( $text ) {
 680                 wfProfileIn( __METHOD__ );
 681
 682                 $lines = StringUtils::explode( "\n", $text );
 683                 $out = '';
 684                 $td_history = array (); // Is currently a td tag open?
 685                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 686                 $tr_history = array (); // Is currently a tr tag open?
 687                 $tr_attributes = array (); // history of tr attributes
 688                 $has_opened_tr = array(); // Did this table open a <tr> element?
 689                 $indent_level = 0; // indent level of the table
 690
 691                 foreach ( $lines as $outLine ) {
 692                         $line = trim( $outLine );
 693
 694                         if( $line == '' ) { // empty line, go to next line
 695                                 $out .= $outLine."\n";
 696                                 continue;
 697                         }
 698                         $first_character = $line[0];
 699                         $matches = array();
 700
 701                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 702                                 // First check if we are starting a new table
 703                                 $indent_level = strlen( $matches[1] );
 704
 705                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 706                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 707
 708                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 709                                 array_push( $td_history , false );
 710                                 array_push( $last_tag_history , '' );
 711                                 array_push( $tr_history , false );
 712                                 array_push( $tr_attributes , '' );
 713                                 array_push( $has_opened_tr , false );
 714                         } else if ( count ( $td_history ) == 0 ) {
 715                                 // Don't do any of the following
 716                                 $out .= $outLine."\n";
 717                                 continue;
 718                         } else if ( substr ( $line , 0 , 2 ) === '|}' ) {
 719                                 // We are ending a table
 720                                 $line = '</table>' . substr ( $line , 2 );
 721                                 $last_tag = array_pop ( $last_tag_history );
 722
 723                                 if ( !array_pop ( $has_opened_tr ) ) {
 724                                         $line = "<tr><td></td></tr>{$line}";
 725                                 }
 726
 727                                 if ( array_pop ( $tr_history ) ) {
 728                                         $line = "</tr>{$line}";
 729                                 }
 730
 731                                 if ( array_pop ( $td_history ) ) {
 732                                         $line = "</{$last_tag}>{$line}";
 733                                 }
 734                                 array_pop ( $tr_attributes );
 735                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 736                         } else if ( substr ( $line , 0 , 2 ) === '|-' ) {
 737                                 // Now we have a table row
 738                                 $line = preg_replace( '#^\|-+#', '', $line );
 739
 740                                 // Whats after the tag is now only attributes
 741                                 $attributes = $this->mStripState->unstripBoth( $line );
 742                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
 743                                 array_pop( $tr_attributes );
 744                                 array_push( $tr_attributes, $attributes );
 745
 746                                 $line = '';
 747                                 $last_tag = array_pop ( $last_tag_history );
 748                                 array_pop ( $has_opened_tr );
 749                                 array_push ( $has_opened_tr , true );
 750
 751                                 if ( array_pop ( $tr_history ) ) {
 752                                         $line = '</tr>';
 753                                 }
 754
 755                                 if ( array_pop ( $td_history ) ) {
 756                                         $line = "</{$last_tag}>{$line}";
 757                                 }
 758
 759                                 $outLine = $line;
 760                                 array_push ( $tr_history , false );
 761                                 array_push ( $td_history , false );
 762                                 array_push ( $last_tag_history , '' );
 763                         }
 764                         else if ( $first_character === '|' || $first_character === '!' || substr ( $line , 0 , 2 )  === '|+' ) {
 765                                 // This might be cell elements, td, th or captions
 766                                 if ( substr ( $line , 0 , 2 ) === '|+' ) {
 767                                         $first_character = '+';
 768                                         $line = substr ( $line , 1 );
 769                                 }
 770
 771                                 $line = substr ( $line , 1 );
 772
 773                                 if ( $first_character === '!' ) {
 774                                         $line = str_replace ( '!!' , '||' , $line );
 775                                 }
 776
 777                                 // Split up multiple cells on the same line.
 778                                 // FIXME : This can result in improper nesting of tags processed
 779                                 // by earlier parser steps, but should avoid splitting up eg
 780                                 // attribute values containing literal "||".
 781                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 782
 783                                 $outLine = '';
 784
 785                                 // Loop through each table cell
 786                                 foreach ( $cells as $cell )
 787                                 {
 788                                         $previous = '';
 789                                         if ( $first_character !== '+' )
 790                                         {
 791                                                 $tr_after = array_pop ( $tr_attributes );
 792                                                 if ( !array_pop ( $tr_history ) ) {
 793                                                         $previous = "<tr{$tr_after}>\n";
 794                                                 }
 795                                                 array_push ( $tr_history , true );
 796                                                 array_push ( $tr_attributes , '' );
 797                                                 array_pop ( $has_opened_tr );
 798                                                 array_push ( $has_opened_tr , true );
 799                                         }
 800
 801                                         $last_tag = array_pop ( $last_tag_history );
 802
 803                                         if ( array_pop ( $td_history ) ) {
 804                                                 $previous = "</{$last_tag}>{$previous}";
 805                                         }
 806
 807                                         if ( $first_character === '|' ) {
 808                                                 $last_tag = 'td';
 809                                         } else if ( $first_character === '!' ) {
 810                                                 $last_tag = 'th';
 811                                         } else if ( $first_character === '+' ) {
 812                                                 $last_tag = 'caption';
 813                                         } else {
 814                                                 $last_tag = '';
 815                                         }
 816
 817                                         array_push ( $last_tag_history , $last_tag );
 818
 819                                         // A cell could contain both parameters and data
 820                                         $cell_data = explode ( '|' , $cell , 2 );
 821
 822                                         // Bug 553: Note that a '|' inside an invalid link should not
 823                                         // be mistaken as delimiting cell parameters
 824                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 825                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 826                                         } else if ( count ( $cell_data ) == 1 )
 827                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 828                                         else {
 829                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 830                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 831                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 832                                         }
 833
 834                                         $outLine .= $cell;
 835                                         array_push ( $td_history , true );
 836                                 }
 837                         }
 838                         $out .= $outLine . "\n";
 839                 }
 840
 841                 // Closing open td, tr && table
 842                 while ( count ( $td_history ) > 0 )
 843                 {
 844                         if ( array_pop ( $td_history ) ) {
 845                                 $out .= "</td>\n";
 846                         }
 847                         if ( array_pop ( $tr_history ) ) {
 848                                 $out .= "</tr>\n";
 849                         }
 850                         if ( !array_pop ( $has_opened_tr ) ) {
 851                                 $out .= "<tr><td></td></tr>\n" ;
 852                         }
 853
 854                         $out .= "</table>\n";
 855                 }
 856
 857                 // Remove trailing line-ending (b/c)
 858                 if ( substr( $out, -1 ) === "\n" ) {
 859                         $out = substr( $out, 0, -1 );
 860                 }
 861
 862                 // special case: don't return empty table
 863                 if( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 864                         $out = '';
 865                 }
 866
 867                 wfProfileOut( __METHOD__ );
 868
 869                 return $out;
 870         }
 871
 872         /**
 873          * Helper function for parse() that transforms wiki markup into
 874          * HTML. Only called for $mOutputType == self::OT_HTML.
 875          *
 876          * @private
 877          */
 878         function internalParse( $text, $isMain = true, $frame=false ) {
 879                 wfProfileIn( __METHOD__ );
 880
 881                 $origText = $text;
 882
 883                 # Hook to suspend the parser in this state
 884                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 885                         wfProfileOut( __METHOD__ );
 886                         return $text ;
 887                 }
 888
 889                 // if $frame is provided, then use $frame for replacing any variables
 890                 if ($frame) {
 891                         // use frame depth to infer how include/noinclude tags should be handled
 892                         // depth=0 means this is the top-level document; otherwise it's an included document
 893                         if( !$frame->depth )
 894                                 $flag = 0;
 895                         else
 896                                 $flag = Parser::PTD_FOR_INCLUSION;
 897                         $dom = $this->preprocessToDom( $text, $flag );
 898                         $text = $frame->expand( $dom );
 899                 }
 900                 // if $frame is not provided, then use old-style replaceVariables
 901                 else {
 902                         $text = $this->replaceVariables( $text );
 903                 }
 904
 905                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 906                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 907
 908                 // Tables need to come after variable replacement for things to work
 909                 // properly; putting them before other transformations should keep
 910                 // exciting things like link expansions from showing up in surprising
 911                 // places.
 912                 $text = $this->doTableStuff( $text );
 913
 914                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 915
 916                 $text = $this->doDoubleUnderscore( $text );
 917
 918                 $text = $this->doHeadings( $text );
 919                 if( $this->mOptions->getUseDynamicDates() ) {
 920                         $df = DateFormatter::getInstance();
 921                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 922                 }
 923                 $text = $this->doAllQuotes( $text );
 924                 $text = $this->replaceInternalLinks( $text );
 925                 $text = $this->replaceExternalLinks( $text );
 926
 927                 # replaceInternalLinks may sometimes leave behind
 928                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 929                 $text = str_replace($this->mUniqPrefix.'NOPARSE', '', $text);
 930
 931                 $text = $this->doMagicLinks( $text );
 932                 $text = $this->formatHeadings( $text, $origText, $isMain );
 933
 934                 wfProfileOut( __METHOD__ );
 935                 return $text;
 936         }
 937
 938         /**
 939          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 940          * magic external links.
 941          *
 942          * DML
 943          * @private
 944          */
 945         function doMagicLinks( $text ) {
 946                 wfProfileIn( __METHOD__ );
 947                 $prots = $this->mUrlProtocols;
 948                 $urlChar = self::EXT_LINK_URL_CLASS;
 949                 $text = preg_replace_callback(
 950                         '!(?:                           # Start cases
 951                                 (<a.*?</a>) |               # m[1]: Skip link text
 952                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
 953                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
 954                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
 955                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
 956                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 957                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 958                                     [0-9Xx]                 # check digit
 959                                     \b)
 960                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 961                 wfProfileOut( __METHOD__ );
 962                 return $text;
 963         }
 964
 965         function magicLinkCallback( $m ) {
 966                 if ( isset( $m[1] ) && $m[1] !== '' ) {
 967                         # Skip anchor
 968                         return $m[0];
 969                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
 970                         # Skip HTML element
 971                         return $m[0];
 972                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
 973                         # Free external link
 974                         return $this->makeFreeExternalLink( $m[0] );
 975                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
 976                         # RFC or PMID
 977                         $CssClass = '';
 978                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
 979                                 $keyword = 'RFC';
 980                                 $urlmsg = 'rfcurl';
 981                                 $CssClass = 'mw-magiclink-rfc';
 982                                 $id = $m[4];
 983                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
 984                                 $keyword = 'PMID';
 985                                 $urlmsg = 'pubmedurl';
 986                                 $CssClass = 'mw-magiclink-pmid';
 987                                 $id = $m[4];
 988                         } else {
 989                                 throw new MWException( __METHOD__.': unrecognised match type "' .
 990                                         substr($m[0], 0, 20 ) . '"' );
 991                         }
 992                         $url = wfMsg( $urlmsg, $id);
 993                         $sk = $this->mOptions->getSkin();
 994                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
 995                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
 996                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
 997                         # ISBN
 998                         $isbn = $m[5];
 999                         $num = strtr( $isbn, array(
1000                                 '-' => '',
1001                                 ' ' => '',
1002                                 'x' => 'X',
1003                         ));
1004                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1005                         return'<a href="' .
1006                                 $titleObj->escapeLocalUrl() .
1007                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1008                 } else {
1009                         return $m[0];
1010                 }
1011         }
1012
1013         /**
1014          * Make a free external link, given a user-supplied URL
1015          * @return HTML
1016          * @private
1017          */
1018         function makeFreeExternalLink( $url ) {
1019                 global $wgContLang;
1020                 wfProfileIn( __METHOD__ );
1021
1022                 $sk = $this->mOptions->getSkin();
1023                 $trail = '';
1024
1025                 # The characters '<' and '>' (which were escaped by
1026                 # removeHTMLtags()) should not be included in
1027                 # URLs, per RFC 2396.
1028                 $m2 = array();
1029                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1030                         $trail = substr($url, $m2[0][1]) . $trail;
1031                         $url = substr($url, 0, $m2[0][1]);
1032                 }
1033
1034                 # Move trailing punctuation to $trail
1035                 $sep = ',;\.:!?';
1036                 # If there is no left bracket, then consider right brackets fair game too
1037                 if ( strpos( $url, '(' ) === false ) {
1038                         $sep .= ')';
1039                 }
1040
1041                 $numSepChars = strspn( strrev( $url ), $sep );
1042                 if ( $numSepChars ) {
1043                         $trail = substr( $url, -$numSepChars ) . $trail;
1044                         $url = substr( $url, 0, -$numSepChars );
1045                 }
1046
1047                 $url = Sanitizer::cleanUrl( $url );
1048
1049                 # Is this an external image?
1050                 $text = $this->maybeMakeExternalImage( $url );
1051                 if ( $text === false ) {
1052                         # Not an image, make a link
1053                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1054                                 $this->getExternalLinkAttribs( $url ) );
1055                         # Register it in the output object...
1056                         # Replace unnecessary URL escape codes with their equivalent characters
1057                         $pasteurized = self::replaceUnusualEscapes( $url );
1058                         $this->mOutput->addExternalLink( $pasteurized );
1059                 }
1060                 wfProfileOut( __METHOD__ );
1061                 return $text . $trail;
1062         }
1063
1064
1065         /**
1066          * Parse headers and return html
1067          *
1068          * @private
1069          */
1070         function doHeadings( $text ) {
1071                 wfProfileIn( __METHOD__ );
1072                 for ( $i = 6; $i >= 1; --$i ) {
1073                         $h = str_repeat( '=', $i );
1074                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1075                           "<h$i>\\1</h$i>", $text );
1076                 }
1077                 wfProfileOut( __METHOD__ );
1078                 return $text;
1079         }
1080
1081         /**
1082          * Replace single quotes with HTML markup
1083          * @private
1084          * @return string the altered text
1085          */
1086         function doAllQuotes( $text ) {
1087                 wfProfileIn( __METHOD__ );
1088                 $outtext = '';
1089                 $lines = StringUtils::explode( "\n", $text );
1090                 foreach ( $lines as $line ) {
1091                         $outtext .= $this->doQuotes( $line ) . "\n";
1092                 }
1093                 $outtext = substr($outtext, 0,-1);
1094                 wfProfileOut( __METHOD__ );
1095                 return $outtext;
1096         }
1097
1098         /**
1099          * Helper function for doAllQuotes()
1100          */
1101         public function doQuotes( $text ) {
1102                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1103                 if ( count( $arr ) == 1 )
1104                         return $text;
1105                 else
1106                 {
1107                         # First, do some preliminary work. This may shift some apostrophes from
1108                         # being mark-up to being text. It also counts the number of occurrences
1109                         # of bold and italics mark-ups.
1110                         $i = 0;
1111                         $numbold = 0;
1112                         $numitalics = 0;
1113                         foreach ( $arr as $r )
1114                         {
1115                                 if ( ( $i % 2 ) == 1 )
1116                                 {
1117                                         # If there are ever four apostrophes, assume the first is supposed to
1118                                         # be text, and the remaining three constitute mark-up for bold text.
1119                                         if ( strlen( $arr[$i] ) == 4 )
1120                                         {
1121                                                 $arr[$i-1] .= "'";
1122                                                 $arr[$i] = "'''";
1123                                         }
1124                                         # If there are more than 5 apostrophes in a row, assume they're all
1125                                         # text except for the last 5.
1126                                         else if ( strlen( $arr[$i] ) > 5 )
1127                                         {
1128                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1129                                                 $arr[$i] = "'''''";
1130                                         }
1131                                         # Count the number of occurrences of bold and italics mark-ups.
1132                                         # We are not counting sequences of five apostrophes.
1133                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1134                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1135                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1136                                 }
1137                                 $i++;
1138                         }
1139
1140                         # If there is an odd number of both bold and italics, it is likely
1141                         # that one of the bold ones was meant to be an apostrophe followed
1142                         # by italics. Which one we cannot know for certain, but it is more
1143                         # likely to be one that has a single-letter word before it.
1144                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1145                         {
1146                                 $i = 0;
1147                                 $firstsingleletterword = -1;
1148                                 $firstmultiletterword = -1;
1149                                 $firstspace = -1;
1150                                 foreach ( $arr as $r )
1151                                 {
1152                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1153                                         {
1154                                                 $x1 = substr ($arr[$i-1], -1);
1155                                                 $x2 = substr ($arr[$i-1], -2, 1);
1156                                                 if ($x1 === ' ') {
1157                                                         if ($firstspace == -1) $firstspace = $i;
1158                                                 } else if ($x2 === ' ') {
1159                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1160                                                 } else {
1161                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1162                                                 }
1163                                         }
1164                                         $i++;
1165                                 }
1166
1167                                 # If there is a single-letter word, use it!
1168                                 if ($firstsingleletterword > -1)
1169                                 {
1170                                         $arr [ $firstsingleletterword ] = "''";
1171                                         $arr [ $firstsingleletterword-1 ] .= "'";
1172                                 }
1173                                 # If not, but there's a multi-letter word, use that one.
1174                                 else if ($firstmultiletterword > -1)
1175                                 {
1176                                         $arr [ $firstmultiletterword ] = "''";
1177                                         $arr [ $firstmultiletterword-1 ] .= "'";
1178                                 }
1179                                 # ... otherwise use the first one that has neither.
1180                                 # (notice that it is possible for all three to be -1 if, for example,
1181                                 # there is only one pentuple-apostrophe in the line)
1182                                 else if ($firstspace > -1)
1183                                 {
1184                                         $arr [ $firstspace ] = "''";
1185                                         $arr [ $firstspace-1 ] .= "'";
1186                                 }
1187                         }
1188
1189                         # Now let's actually convert our apostrophic mush to HTML!
1190                         $output = '';
1191                         $buffer = '';
1192                         $state = '';
1193                         $i = 0;
1194                         foreach ($arr as $r)
1195                         {
1196                                 if (($i % 2) == 0)
1197                                 {
1198                                         if ($state === 'both')
1199                                                 $buffer .= $r;
1200                                         else
1201                                                 $output .= $r;
1202                                 }
1203                                 else
1204                                 {
1205                                         if (strlen ($r) == 2)
1206                                         {
1207                                                 if ($state === 'i')
1208                                                 { $output .= '</i>'; $state = ''; }
1209                                                 else if ($state === 'bi')
1210                                                 { $output .= '</i>'; $state = 'b'; }
1211                                                 else if ($state === 'ib')
1212                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1213                                                 else if ($state === 'both')
1214                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1215                                                 else # $state can be 'b' or ''
1216                                                 { $output .= '<i>'; $state .= 'i'; }
1217                                         }
1218                                         else if (strlen ($r) == 3)
1219                                         {
1220                                                 if ($state === 'b')
1221                                                 { $output .= '</b>'; $state = ''; }
1222                                                 else if ($state === 'bi')
1223                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1224                                                 else if ($state === 'ib')
1225                                                 { $output .= '</b>'; $state = 'i'; }
1226                                                 else if ($state === 'both')
1227                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1228                                                 else # $state can be 'i' or ''
1229                                                 { $output .= '<b>'; $state .= 'b'; }
1230                                         }
1231                                         else if (strlen ($r) == 5)
1232                                         {
1233                                                 if ($state === 'b')
1234                                                 { $output .= '</b><i>'; $state = 'i'; }
1235                                                 else if ($state === 'i')
1236                                                 { $output .= '</i><b>'; $state = 'b'; }
1237                                                 else if ($state === 'bi')
1238                                                 { $output .= '</i></b>'; $state = ''; }
1239                                                 else if ($state === 'ib')
1240                                                 { $output .= '</b></i>'; $state = ''; }
1241                                                 else if ($state === 'both')
1242                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1243                                                 else # ($state == '')
1244                                                 { $buffer = ''; $state = 'both'; }
1245                                         }
1246                                 }
1247                                 $i++;
1248                         }
1249                         # Now close all remaining tags.  Notice that the order is important.
1250                         if ($state === 'b' || $state === 'ib')
1251                                 $output .= '</b>';
1252                         if ($state === 'i' || $state === 'bi' || $state === 'ib')
1253                                 $output .= '</i>';
1254                         if ($state === 'bi')
1255                                 $output .= '</b>';
1256                         # There might be lonely ''''', so make sure we have a buffer
1257                         if ($state === 'both' && $buffer)
1258                                 $output .= '<b><i>'.$buffer.'</i></b>';
1259                         return $output;
1260                 }
1261         }
1262
1263         /**
1264          * Replace external links (REL)
1265          *
1266          * Note: this is all very hackish and the order of execution matters a lot.
1267          * Make sure to run maintenance/parserTests.php if you change this code.
1268          *
1269          * @private
1270          */
1271         function replaceExternalLinks( $text ) {
1272                 global $wgContLang;
1273                 wfProfileIn( __METHOD__ );
1274
1275                 $sk = $this->mOptions->getSkin();
1276
1277                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1278                 $s = array_shift( $bits );
1279
1280                 $i = 0;
1281                 while ( $i<count( $bits ) ) {
1282                         $url = $bits[$i++];
1283                         $protocol = $bits[$i++];
1284                         $text = $bits[$i++];
1285                         $trail = $bits[$i++];
1286
1287                         # The characters '<' and '>' (which were escaped by
1288                         # removeHTMLtags()) should not be included in
1289                         # URLs, per RFC 2396.
1290                         $m2 = array();
1291                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1292                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1293                                 $url = substr($url, 0, $m2[0][1]);
1294                         }
1295
1296                         # If the link text is an image URL, replace it with an <img> tag
1297                         # This happened by accident in the original parser, but some people used it extensively
1298                         $img = $this->maybeMakeExternalImage( $text );
1299                         if ( $img !== false ) {
1300                                 $text = $img;
1301                         }
1302
1303                         $dtrail = '';
1304
1305                         # Set linktype for CSS - if URL==text, link is essentially free
1306                         $linktype = ($text === $url) ? 'free' : 'text';
1307
1308                         # No link text, e.g. [http://domain.tld/some.link]
1309                         if ( $text == '' ) {
1310                                 # Autonumber if allowed. See bug #5918
1311                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1312                                         $langObj = $this->getFunctionLang();
1313                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1314                                         $linktype = 'autonumber';
1315                                 } else {
1316                                         # Otherwise just use the URL
1317                                         $text = htmlspecialchars( $url );
1318                                         $linktype = 'free';
1319                                 }
1320                         } else {
1321                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1322                                 # Check for trail
1323                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1324                         }
1325
1326                         $text = $wgContLang->markNoConversion($text);
1327
1328                         $url = Sanitizer::cleanUrl( $url );
1329
1330                         # Use the encoded URL
1331                         # This means that users can paste URLs directly into the text
1332                         # Funny characters like &ouml; aren't valid in URLs anyway
1333                         # This was changed in August 2004
1334                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1335                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1336
1337                         # Register link in the output object.
1338                         # Replace unnecessary URL escape codes with the referenced character
1339                         # This prevents spammers from hiding links from the filters
1340                         $pasteurized = self::replaceUnusualEscapes( $url );
1341                         $this->mOutput->addExternalLink( $pasteurized );
1342                 }
1343
1344                 wfProfileOut( __METHOD__ );
1345                 return $s;
1346         }
1347
1348         /**
1349          * Get an associative array of additional HTML attributes appropriate for a
1350          * particular external link.  This currently may include rel => nofollow
1351          * (depending on configuration, namespace, and the URL's domain) and/or a
1352          * target attribute (depending on configuration).
1353          *
1354          * @param string $url Optional URL, to extract the domain from for rel =>
1355          *   nofollow if appropriate
1356          * @return array Associative array of HTML attributes
1357          */
1358         function getExternalLinkAttribs( $url = false ) {
1359                 $attribs = array();
1360                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1361                 $ns = $this->mTitle->getNamespace();
1362                 if( $wgNoFollowLinks && !in_array($ns, $wgNoFollowNsExceptions) ) {
1363                         $attribs['rel'] = 'nofollow';
1364
1365                         global $wgNoFollowDomainExceptions;
1366                         if ( $wgNoFollowDomainExceptions ) {
1367                                 $bits = wfParseUrl( $url );
1368                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1369                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1370                                                 if( substr( $bits['host'], -strlen( $domain ) )
1371                                                 == $domain ) {
1372                                                         unset( $attribs['rel'] );
1373                                                         break;
1374                                                 }
1375                                         }
1376                                 }
1377                         }
1378                 }
1379                 if ( $this->mOptions->getExternalLinkTarget() ) {
1380                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1381                 }
1382                 return $attribs;
1383         }
1384
1385
1386         /**
1387          * Replace unusual URL escape codes with their equivalent characters
1388          * @param string
1389          * @return string
1390          * @static
1391          * @todo  This can merge genuinely required bits in the path or query string,
1392          *        breaking legit URLs. A proper fix would treat the various parts of
1393          *        the URL differently; as a workaround, just use the output for
1394          *        statistical records, not for actual linking/output.
1395          */
1396         static function replaceUnusualEscapes( $url ) {
1397                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1398                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1399         }
1400
1401         /**
1402          * Callback function used in replaceUnusualEscapes().
1403          * Replaces unusual URL escape codes with their equivalent character
1404          * @static
1405          * @private
1406          */
1407         private static function replaceUnusualEscapesCallback( $matches ) {
1408                 $char = urldecode( $matches[0] );
1409                 $ord = ord( $char );
1410                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1411                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1412                         // No, shouldn't be escaped
1413                         return $char;
1414                 } else {
1415                         // Yes, leave it escaped
1416                         return $matches[0];
1417                 }
1418         }
1419
1420         /**
1421          * make an image if it's allowed, either through the global
1422          * option, through the exception, or through the on-wiki whitelist
1423          * @private
1424          */
1425         function maybeMakeExternalImage( $url ) {
1426                 $sk = $this->mOptions->getSkin();
1427                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1428                 $imagesexception = !empty($imagesfrom);
1429                 $text = false;
1430                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1431                 if( $imagesexception && is_array( $imagesfrom ) ) {
1432                         $imagematch = false;
1433                         foreach( $imagesfrom as $match ) {
1434                                 if( strpos( $url, $match ) === 0 ) {
1435                                         $imagematch = true;
1436                                         break;
1437                                 }
1438                         }
1439                 } elseif( $imagesexception ) {
1440                         $imagematch = (strpos( $url, $imagesfrom ) === 0);
1441                 } else {
1442                         $imagematch = false;
1443                 }
1444                 if ( $this->mOptions->getAllowExternalImages()
1445                      || ( $imagesexception && $imagematch ) ) {
1446                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1447                                 # Image found
1448                                 $text = $sk->makeExternalImage( $url );
1449                         }
1450                 }
1451                 if( !$text && $this->mOptions->getEnableImageWhitelist()
1452                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1453                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1454                         foreach( $whitelist as $entry ) {
1455                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1456                                 if( strpos( $entry, '#' ) === 0 || $entry === '' )
1457                                         continue;
1458                                 if( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1459                                         # Image matches a whitelist entry
1460                                         $text = $sk->makeExternalImage( $url );
1461                                         break;
1462                                 }
1463                         }
1464                 }
1465                 return $text;
1466         }
1467
1468         /**
1469          * Process [[ ]] wikilinks
1470          * @return processed text
1471          *
1472          * @private
1473          */
1474         function replaceInternalLinks( $s ) {
1475                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1476                 return $s;
1477         }
1478
1479         /**
1480          * Process [[ ]] wikilinks (RIL)
1481          * @return LinkHolderArray
1482          *
1483          * @private
1484          */
1485         function replaceInternalLinks2( &$s ) {
1486                 global $wgContLang;
1487
1488                 wfProfileIn( __METHOD__ );
1489
1490                 wfProfileIn( __METHOD__.'-setup' );
1491                 static $tc = FALSE, $e1, $e1_img;
1492                 # the % is needed to support urlencoded titles as well
1493                 if ( !$tc ) {
1494                         $tc = Title::legalChars() . '#%';
1495                         # Match a link having the form [[namespace:link|alternate]]trail
1496                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1497                         # Match cases where there is no "]]", which might still be images
1498                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1499                 }
1500
1501                 $sk = $this->mOptions->getSkin();
1502                 $holders = new LinkHolderArray( $this );
1503
1504                 #split the entire text string on occurences of [[
1505                 $a = StringUtils::explode( '[[', ' ' . $s );
1506                 #get the first element (all text up to first [[), and remove the space we added
1507                 $s = $a->current();
1508                 $a->next();
1509                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1510                 $s = substr( $s, 1 );
1511
1512                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1513                 $e2 = null;
1514                 if ( $useLinkPrefixExtension ) {
1515                         # Match the end of a line for a word that's not followed by whitespace,
1516                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1517                         $e2 = wfMsgForContent( 'linkprefix' );
1518                 }
1519
1520                 if( is_null( $this->mTitle ) ) {
1521                         wfProfileOut( __METHOD__.'-setup' );
1522                         wfProfileOut( __METHOD__ );
1523                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1524                 }
1525                 $nottalk = !$this->mTitle->isTalkPage();
1526
1527                 if ( $useLinkPrefixExtension ) {
1528                         $m = array();
1529                         if ( preg_match( $e2, $s, $m ) ) {
1530                                 $first_prefix = $m[2];
1531                         } else {
1532                                 $first_prefix = false;
1533                         }
1534                 } else {
1535                         $prefix = '';
1536                 }
1537
1538                 if($wgContLang->hasVariants()) {
1539                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1540                 } else {
1541                         $selflink = array($this->mTitle->getPrefixedText());
1542                 }
1543                 $useSubpages = $this->areSubpagesAllowed();
1544                 wfProfileOut( __METHOD__.'-setup' );
1545
1546                 # Loop for each link
1547                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1548                         # Check for excessive memory usage
1549                         if ( $holders->isBig() ) {
1550                                 # Too big
1551                                 # Do the existence check, replace the link holders and clear the array
1552                                 $holders->replace( $s );
1553                                 $holders->clear();
1554                         }
1555
1556                         if ( $useLinkPrefixExtension ) {
1557                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1558                                 if ( preg_match( $e2, $s, $m ) ) {
1559                                         $prefix = $m[2];
1560                                         $s = $m[1];
1561                                 } else {
1562                                         $prefix='';
1563                                 }
1564                                 # first link
1565                                 if($first_prefix) {
1566                                         $prefix = $first_prefix;
1567                                         $first_prefix = false;
1568                                 }
1569                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1570                         }
1571
1572                         $might_be_img = false;
1573
1574                         wfProfileIn( __METHOD__."-e1" );
1575                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1576                                 $text = $m[2];
1577                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1578                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1579                                 # the real problem is with the $e1 regex
1580                                 # See bug 1300.
1581                                 #
1582                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1583                                 # and no image is in sight. See bug 2095.
1584                                 #
1585                                 if( $text !== '' &&
1586                                         substr( $m[3], 0, 1 ) === ']' &&
1587                                         strpos($text, '[') !== false
1588                                 )
1589                                 {
1590                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1591                                         $m[3] = substr( $m[3], 1 );
1592                                 }
1593                                 # fix up urlencoded title texts
1594                                 if( strpos( $m[1], '%' ) !== false ) {
1595                                         # Should anchors '#' also be rejected?
1596                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1597                                 }
1598                                 $trail = $m[3];
1599                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1600                                 $might_be_img = true;
1601                                 $text = $m[2];
1602                                 if ( strpos( $m[1], '%' ) !== false ) {
1603                                         $m[1] = urldecode($m[1]);
1604                                 }
1605                                 $trail = "";
1606                         } else { # Invalid form; output directly
1607                                 $s .= $prefix . '[[' . $line ;
1608                                 wfProfileOut( __METHOD__."-e1" );
1609                                 continue;
1610                         }
1611                         wfProfileOut( __METHOD__."-e1" );
1612                         wfProfileIn( __METHOD__."-misc" );
1613
1614                         # Don't allow internal links to pages containing
1615                         # PROTO: where PROTO is a valid URL protocol; these
1616                         # should be external links.
1617                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1618                                 $s .= $prefix . '[[' . $line ;
1619                                 wfProfileOut( __METHOD__."-misc" );
1620                                 continue;
1621                         }
1622
1623                         # Make subpage if necessary
1624                         if ( $useSubpages ) {
1625                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1626                         } else {
1627                                 $link = $m[1];
1628                         }
1629
1630                         $noforce = (substr( $m[1], 0, 1 ) !== ':');
1631                         if (!$noforce) {
1632                                 # Strip off leading ':'
1633                                 $link = substr( $link, 1 );
1634                         }
1635
1636                         wfProfileOut( __METHOD__."-misc" );
1637                         wfProfileIn( __METHOD__."-title" );
1638                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1639                         if ( $nt === null ) {
1640                                 $s .= $prefix . '[[' . $line;
1641                                 wfProfileOut( __METHOD__."-title" );
1642                                 continue;
1643                         }
1644
1645                         $ns = $nt->getNamespace();
1646                         $iw = $nt->getInterWiki();
1647                         wfProfileOut( __METHOD__."-title" );
1648
1649                         if ( $might_be_img ) { # if this is actually an invalid link
1650                                 wfProfileIn( __METHOD__."-might_be_img" );
1651                                 if ( $ns == NS_FILE && $noforce ) { #but might be an image
1652                                         $found = false;
1653                                         while ( true ) {
1654                                                 #look at the next 'line' to see if we can close it there
1655                                                 $a->next();
1656                                                 $next_line = $a->current();
1657                                                 if ( $next_line === false || $next_line === null ) {
1658                                                         break;
1659                                                 }
1660                                                 $m = explode( ']]', $next_line, 3 );
1661                                                 if ( count( $m ) == 3 ) {
1662                                                         # the first ]] closes the inner link, the second the image
1663                                                         $found = true;
1664                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1665                                                         $trail = $m[2];
1666                                                         break;
1667                                                 } elseif ( count( $m ) == 2 ) {
1668                                                         #if there's exactly one ]] that's fine, we'll keep looking
1669                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1670                                                 } else {
1671                                                         #if $next_line is invalid too, we need look no further
1672                                                         $text .= '[[' . $next_line;
1673                                                         break;
1674                                                 }
1675                                         }
1676                                         if ( !$found ) {
1677                                                 # we couldn't find the end of this imageLink, so output it raw
1678                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1679                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1680                                                 $s .= "{$prefix}[[$link|$text";
1681                                                 # note: no $trail, because without an end, there *is* no trail
1682                                                 wfProfileOut( __METHOD__."-might_be_img" );
1683                                                 continue;
1684                                         }
1685                                 } else { #it's not an image, so output it raw
1686                                         $s .= "{$prefix}[[$link|$text";
1687                                         # note: no $trail, because without an end, there *is* no trail
1688                                         wfProfileOut( __METHOD__."-might_be_img" );
1689                                         continue;
1690                                 }
1691                                 wfProfileOut( __METHOD__."-might_be_img" );
1692                         }
1693
1694                         $wasblank = ( $text  == '' );
1695                         if ( $wasblank ) $text = $link;
1696
1697                         # Link not escaped by : , create the various objects
1698                         if ( $noforce ) {
1699
1700                                 # Interwikis
1701                                 wfProfileIn( __METHOD__."-interwiki" );
1702                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1703                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1704                                         $s = rtrim($s . $prefix);
1705                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1706                                         wfProfileOut( __METHOD__."-interwiki" );
1707                                         continue;
1708                                 }
1709                                 wfProfileOut( __METHOD__."-interwiki" );
1710
1711                                 if ( $ns == NS_FILE ) {
1712                                         wfProfileIn( __METHOD__."-image" );
1713                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1714                                                 if ( $wasblank ) {
1715                                                         # if no parameters were passed, $text
1716                                                         # becomes something like "File:Foo.png",
1717                                                         # which we don't want to pass on to the
1718                                                         # image generator
1719                                                         $text = '';
1720                                                 } else {
1721                                                         # recursively parse links inside the image caption
1722                                                         # actually, this will parse them in any other parameters, too,
1723                                                         # but it might be hard to fix that, and it doesn't matter ATM
1724                                                         $text = $this->replaceExternalLinks($text);
1725                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1726                                                 }
1727                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1728                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1729                                         } else {
1730                                                 $s .= $prefix . $trail;
1731                                         }
1732                                         $this->mOutput->addImage( $nt->getDBkey() );
1733                                         wfProfileOut( __METHOD__."-image" );
1734                                         continue;
1735
1736                                 }
1737
1738                                 if ( $ns == NS_CATEGORY ) {
1739                                         wfProfileIn( __METHOD__."-category" );
1740                                         $s = rtrim($s . "\n"); # bug 87
1741
1742                                         if ( $wasblank ) {
1743                                                 $sortkey = $this->getDefaultSort();
1744                                         } else {
1745                                                 $sortkey = $text;
1746                                         }
1747                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1748                                         $sortkey = str_replace( "\n", '', $sortkey );
1749                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1750                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1751
1752                                         /**
1753                                          * Strip the whitespace Category links produce, see bug 87
1754                                          * @todo We might want to use trim($tmp, "\n") here.
1755                                          */
1756                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1757
1758                                         wfProfileOut( __METHOD__."-category" );
1759                                         continue;
1760                                 }
1761                         }
1762
1763                         # Self-link checking
1764                         if( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1765                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1766                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1767                                         continue;
1768                                 }
1769                         }
1770
1771                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1772                         # FIXME: Should do batch file existence checks, see comment below
1773                         if( $ns == NS_MEDIA ) {
1774                                 wfProfileIn( __METHOD__."-media" );
1775                                 # Give extensions a chance to select the file revision for us
1776                                 $skip = $time = false;
1777                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1778                                 if ( $skip ) {
1779                                         $link = $sk->link( $nt );
1780                                 } else {
1781                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1782                                 }
1783                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1784                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1785                                 $this->mOutput->addImage( $nt->getDBkey() );
1786                                 wfProfileOut( __METHOD__."-media" );
1787                                 continue;
1788                         }
1789
1790                         wfProfileIn( __METHOD__."-always_known" );
1791                         # Some titles, such as valid special pages or files in foreign repos, should
1792                         # be shown as bluelinks even though they're not included in the page table
1793                         #
1794                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1795                         # batch file existence checks for NS_FILE and NS_MEDIA
1796                         if( $iw == '' && $nt->isAlwaysKnown() ) {
1797                                 $this->mOutput->addLink( $nt );
1798                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1799                         } else {
1800                                 # Links will be added to the output link list after checking
1801                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1802                         }
1803                         wfProfileOut( __METHOD__."-always_known" );
1804                 }
1805                 wfProfileOut( __METHOD__ );
1806                 return $holders;
1807         }
1808
1809         /**
1810          * Make a link placeholder. The text returned can be later resolved to a real link with
1811          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1812          * parsing of interwiki links, and secondly to allow all existence checks and
1813          * article length checks (for stub links) to be bundled into a single query.
1814          *
1815          * @deprecated
1816          */
1817         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1818                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1819         }
1820
1821         /**
1822          * Render a forced-blue link inline; protect against double expansion of
1823          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1824          * Since this little disaster has to split off the trail text to avoid
1825          * breaking URLs in the following text without breaking trails on the
1826          * wiki links, it's been made into a horrible function.
1827          *
1828          * @param Title $nt
1829          * @param string $text
1830          * @param string $query
1831          * @param string $trail
1832          * @param string $prefix
1833          * @return string HTML-wikitext mix oh yuck
1834          */
1835         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1836                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1837                 $sk = $this->mOptions->getSkin();
1838                 // FIXME: use link() instead of deprecated makeKnownLinkObj()
1839                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1840                 return $this->armorLinks( $link ) . $trail;
1841         }
1842
1843         /**
1844          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1845          * going to go through further parsing steps before inline URL expansion.
1846          *
1847          * Not needed quite as much as it used to be since free links are a bit
1848          * more sensible these days. But bracketed links are still an issue.
1849          *
1850          * @param string more-or-less HTML
1851          * @return string less-or-more HTML with NOPARSE bits
1852          */
1853         function armorLinks( $text ) {
1854                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1855                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1856         }
1857
1858         /**
1859          * Return true if subpage links should be expanded on this page.
1860          * @return bool
1861          */
1862         function areSubpagesAllowed() {
1863                 # Some namespaces don't allow subpages
1864                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1865         }
1866
1867         /**
1868          * Handle link to subpage if necessary
1869          * @param string $target the source of the link
1870          * @param string &$text the link text, modified as necessary
1871          * @return string the full name of the link
1872          * @private
1873          */
1874         function maybeDoSubpageLink($target, &$text) {
1875                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1876         }
1877
1878         /**#@+
1879          * Used by doBlockLevels()
1880          * @private
1881          */
1882         /* private */ function closeParagraph() {
1883                 $result = '';
1884                 if ( $this->mLastSection != '' ) {
1885                         $result = '</' . $this->mLastSection  . ">\n";
1886                 }
1887                 $this->mInPre = false;
1888                 $this->mLastSection = '';
1889                 return $result;
1890         }
1891         # getCommon() returns the length of the longest common substring
1892         # of both arguments, starting at the beginning of both.
1893         #
1894         /* private */ function getCommon( $st1, $st2 ) {
1895                 $fl = strlen( $st1 );
1896                 $shorter = strlen( $st2 );
1897                 if ( $fl < $shorter ) { $shorter = $fl; }
1898
1899                 for ( $i = 0; $i < $shorter; ++$i ) {
1900                         if ( $st1{$i} != $st2{$i} ) { break; }
1901                 }
1902                 return $i;
1903         }
1904         # These next three functions open, continue, and close the list
1905         # element appropriate to the prefix character passed into them.
1906         #
1907         /* private */ function openList( $char ) {
1908                 $result = $this->closeParagraph();
1909
1910                 if ( '*' === $char ) { $result .= '<ul><li>'; }
1911                 elseif ( '#' === $char ) { $result .= '<ol><li>'; }
1912                 elseif ( ':' === $char ) { $result .= '<dl><dd>'; }
1913                 elseif ( ';' === $char ) {
1914                         $result .= '<dl><dt>';
1915                         $this->mDTopen = true;
1916                 }
1917                 else { $result = '<!-- ERR 1 -->'; }
1918
1919                 return $result;
1920         }
1921
1922         /* private */ function nextItem( $char ) {
1923                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
1924                 elseif ( ':' === $char || ';' === $char ) {
1925                         $close = '</dd>';
1926                         if ( $this->mDTopen ) { $close = '</dt>'; }
1927                         if ( ';' === $char ) {
1928                                 $this->mDTopen = true;
1929                                 return $close . '<dt>';
1930                         } else {
1931                                 $this->mDTopen = false;
1932                                 return $close . '<dd>';
1933                         }
1934                 }
1935                 return '<!-- ERR 2 -->';
1936         }
1937
1938         /* private */ function closeList( $char ) {
1939                 if ( '*' === $char ) { $text = '</li></ul>'; }
1940                 elseif ( '#' === $char ) { $text = '</li></ol>'; }
1941                 elseif ( ':' === $char ) {
1942                         if ( $this->mDTopen ) {
1943                                 $this->mDTopen = false;
1944                                 $text = '</dt></dl>';
1945                         } else {
1946                                 $text = '</dd></dl>';
1947                         }
1948                 }
1949                 else {  return '<!-- ERR 3 -->'; }
1950                 return $text."\n";
1951         }
1952         /**#@-*/
1953
1954         /**
1955          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
1956          *
1957          * @param $linestart bool whether or not this is at the start of a line.
1958          * @private
1959          * @return string the lists rendered as HTML
1960          */
1961         function doBlockLevels( $text, $linestart ) {
1962                 wfProfileIn( __METHOD__ );
1963
1964                 # Parsing through the text line by line.  The main thing
1965                 # happening here is handling of block-level elements p, pre,
1966                 # and making lists from lines starting with * # : etc.
1967                 #
1968                 $textLines = StringUtils::explode( "\n", $text );
1969
1970                 $lastPrefix = $output = '';
1971                 $this->mDTopen = $inBlockElem = false;
1972                 $prefixLength = 0;
1973                 $paragraphStack = false;
1974
1975                 foreach ( $textLines as $oLine ) {
1976                         # Fix up $linestart
1977                         if ( !$linestart ) {
1978                                 $output .= $oLine;
1979                                 $linestart = true;
1980                                 continue;
1981                         }
1982                         // * = ul
1983                         // # = ol
1984                         // ; = dt
1985                         // : = dd
1986
1987                         $lastPrefixLength = strlen( $lastPrefix );
1988                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1989                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1990                         // If not in a <pre> element, scan for and figure out what prefixes are there.
1991                         if ( !$this->mInPre ) {
1992                                 # Multiple prefixes may abut each other for nested lists.
1993                                 $prefixLength = strspn( $oLine, '*#:;' );
1994                                 $prefix = substr( $oLine, 0, $prefixLength );
1995
1996                                 # eh?
1997                                 // ; and : are both from definition-lists, so they're equivalent
1998                                 //  for the purposes of determining whether or not we need to open/close
1999                                 //  elements.
2000                                 $prefix2 = str_replace( ';', ':', $prefix );
2001                                 $t = substr( $oLine, $prefixLength );
2002                                 $this->mInPre = (bool)$preOpenMatch;
2003                         } else {
2004                                 # Don't interpret any other prefixes in preformatted text
2005                                 $prefixLength = 0;
2006                                 $prefix = $prefix2 = '';
2007                                 $t = $oLine;
2008                         }
2009
2010                         # List generation
2011                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2012                                 # Same as the last item, so no need to deal with nesting or opening stuff
2013                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2014                                 $paragraphStack = false;
2015
2016                                 if ( substr( $prefix, -1 ) === ';') {
2017                                         # The one nasty exception: definition lists work like this:
2018                                         # ; title : definition text
2019                                         # So we check for : in the remainder text to split up the
2020                                         # title and definition, without b0rking links.
2021                                         $term = $t2 = '';
2022                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2023                                                 $t = $t2;
2024                                                 $output .= $term . $this->nextItem( ':' );
2025                                         }
2026                                 }
2027                         } elseif( $prefixLength || $lastPrefixLength ) {
2028                                 // We need to open or close prefixes, or both.
2029
2030                                 # Either open or close a level...
2031                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2032                                 $paragraphStack = false;
2033
2034                                 // Close all the prefixes which aren't shared.
2035                                 while( $commonPrefixLength < $lastPrefixLength ) {
2036                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2037                                         --$lastPrefixLength;
2038                                 }
2039
2040                                 // Continue the current prefix if appropriate.
2041                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2042                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2043                                 }
2044
2045                                 // Open prefixes where appropriate.
2046                                 while ( $prefixLength > $commonPrefixLength ) {
2047                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2048                                         $output .= $this->openList( $char );
2049
2050                                         if ( ';' === $char ) {
2051                                                 # FIXME: This is dupe of code above
2052                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2053                                                         $t = $t2;
2054                                                         $output .= $term . $this->nextItem( ':' );
2055                                                 }
2056                                         }
2057                                         ++$commonPrefixLength;
2058                                 }
2059                                 $lastPrefix = $prefix2;
2060                         }
2061
2062                         // If we have no prefixes, go to paragraph mode.
2063                         if( 0 == $prefixLength ) {
2064                                 wfProfileIn( __METHOD__."-paragraph" );
2065                                 # No prefix (not in list)--go to paragraph mode
2066                                 // XXX: use a stack for nestable elements like span, table and div
2067                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2068                                 $closematch = preg_match(
2069                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2070                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2071                                 if ( $openmatch or $closematch ) {
2072                                         $paragraphStack = false;
2073                                         # TODO bug 5718: paragraph closed
2074                                         $output .= $this->closeParagraph();
2075                                         if ( $preOpenMatch and !$preCloseMatch ) {
2076                                                 $this->mInPre = true;
2077                                         }
2078                                         if ( $closematch ) {
2079                                                 $inBlockElem = false;
2080                                         } else {
2081                                                 $inBlockElem = true;
2082                                         }
2083                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2084                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2085                                                 // pre
2086                                                 if ($this->mLastSection !== 'pre') {
2087                                                         $paragraphStack = false;
2088                                                         $output .= $this->closeParagraph().'<pre>';
2089                                                         $this->mLastSection = 'pre';
2090                                                 }
2091                                                 $t = substr( $t, 1 );
2092                                         } else {
2093                                                 // paragraph
2094                                                 if ( trim($t) == '' ) {
2095                                                         if ( $paragraphStack ) {
2096                                                                 $output .= $paragraphStack.'<br />';
2097                                                                 $paragraphStack = false;
2098                                                                 $this->mLastSection = 'p';
2099                                                         } else {
2100                                                                 if ($this->mLastSection !== 'p' ) {
2101                                                                         $output .= $this->closeParagraph();
2102                                                                         $this->mLastSection = '';
2103                                                                         $paragraphStack = '<p>';
2104                                                                 } else {
2105                                                                         $paragraphStack = '</p><p>';
2106                                                                 }
2107                                                         }
2108                                                 } else {
2109                                                         if ( $paragraphStack ) {
2110                                                                 $output .= $paragraphStack;
2111                                                                 $paragraphStack = false;
2112                                                                 $this->mLastSection = 'p';
2113                                                         } else if ($this->mLastSection !== 'p') {
2114                                                                 $output .= $this->closeParagraph().'<p>';
2115                                                                 $this->mLastSection = 'p';
2116                                                         }
2117                                                 }
2118                                         }
2119                                 }
2120                                 wfProfileOut( __METHOD__."-paragraph" );
2121                         }
2122                         // somewhere above we forget to get out of pre block (bug 785)
2123                         if($preCloseMatch && $this->mInPre) {
2124                                 $this->mInPre = false;
2125                         }
2126                         if ($paragraphStack === false) {
2127                                 $output .= $t."\n";
2128                         }
2129                 }
2130                 while ( $prefixLength ) {
2131                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2132                         --$prefixLength;
2133                 }
2134                 if ( $this->mLastSection != '' ) {
2135                         $output .= '</' . $this->mLastSection . '>';
2136                         $this->mLastSection = '';
2137                 }
2138
2139                 wfProfileOut( __METHOD__ );
2140                 return $output;
2141         }
2142
2143         /**
2144          * Split up a string on ':', ignoring any occurences inside tags
2145          * to prevent illegal overlapping.
2146          * @param string $str the string to split
2147          * @param string &$before set to everything before the ':'
2148          * @param string &$after set to everything after the ':'
2149          * return string the position of the ':', or false if none found
2150          */
2151         function findColonNoLinks($str, &$before, &$after) {
2152                 wfProfileIn( __METHOD__ );
2153
2154                 $pos = strpos( $str, ':' );
2155                 if( $pos === false ) {
2156                         // Nothing to find!
2157                         wfProfileOut( __METHOD__ );
2158                         return false;
2159                 }
2160
2161                 $lt = strpos( $str, '<' );
2162                 if( $lt === false || $lt > $pos ) {
2163                         // Easy; no tag nesting to worry about
2164                         $before = substr( $str, 0, $pos );
2165                         $after = substr( $str, $pos+1 );
2166                         wfProfileOut( __METHOD__ );
2167                         return $pos;
2168                 }
2169
2170                 // Ugly state machine to walk through avoiding tags.
2171                 $state = self::COLON_STATE_TEXT;
2172                 $stack = 0;
2173                 $len = strlen( $str );
2174                 for( $i = 0; $i < $len; $i++ ) {
2175                         $c = $str{$i};
2176
2177                         switch( $state ) {
2178                         // (Using the number is a performance hack for common cases)
2179                         case 0: // self::COLON_STATE_TEXT:
2180                                 switch( $c ) {
2181                                 case "<":
2182                                         // Could be either a <start> tag or an </end> tag
2183                                         $state = self::COLON_STATE_TAGSTART;
2184                                         break;
2185                                 case ":":
2186                                         if( $stack == 0 ) {
2187                                                 // We found it!
2188                                                 $before = substr( $str, 0, $i );
2189                                                 $after = substr( $str, $i + 1 );
2190                                                 wfProfileOut( __METHOD__ );
2191                                                 return $i;
2192                                         }
2193                                         // Embedded in a tag; don't break it.
2194                                         break;
2195                                 default:
2196                                         // Skip ahead looking for something interesting
2197                                         $colon = strpos( $str, ':', $i );
2198                                         if( $colon === false ) {
2199                                                 // Nothing else interesting
2200                                                 wfProfileOut( __METHOD__ );
2201                                                 return false;
2202                                         }
2203                                         $lt = strpos( $str, '<', $i );
2204                                         if( $stack === 0 ) {
2205                                                 if( $lt === false || $colon < $lt ) {
2206                                                         // We found it!
2207                                                         $before = substr( $str, 0, $colon );
2208                                                         $after = substr( $str, $colon + 1 );
2209                                                         wfProfileOut( __METHOD__ );
2210                                                         return $i;
2211                                                 }
2212                                         }
2213                                         if( $lt === false ) {
2214                                                 // Nothing else interesting to find; abort!
2215                                                 // We're nested, but there's no close tags left. Abort!
2216                                                 break 2;
2217                                         }
2218                                         // Skip ahead to next tag start
2219                                         $i = $lt;
2220                                         $state = self::COLON_STATE_TAGSTART;
2221                                 }
2222                                 break;
2223                         case 1: // self::COLON_STATE_TAG:
2224                                 // In a <tag>
2225                                 switch( $c ) {
2226                                 case ">":
2227                                         $stack++;
2228                                         $state = self::COLON_STATE_TEXT;
2229                                         break;
2230                                 case "/":
2231                                         // Slash may be followed by >?
2232                                         $state = self::COLON_STATE_TAGSLASH;
2233                                         break;
2234                                 default:
2235                                         // ignore
2236                                 }
2237                                 break;
2238                         case 2: // self::COLON_STATE_TAGSTART:
2239                                 switch( $c ) {
2240                                 case "/":
2241                                         $state = self::COLON_STATE_CLOSETAG;
2242                                         break;
2243                                 case "!":
2244                                         $state = self::COLON_STATE_COMMENT;
2245                                         break;
2246                                 case ">":
2247                                         // Illegal early close? This shouldn't happen D:
2248                                         $state = self::COLON_STATE_TEXT;
2249                                         break;
2250                                 default:
2251                                         $state = self::COLON_STATE_TAG;
2252                                 }
2253                                 break;
2254                         case 3: // self::COLON_STATE_CLOSETAG:
2255                                 // In a </tag>
2256                                 if( $c === ">" ) {
2257                                         $stack--;
2258                                         if( $stack < 0 ) {
2259                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2260                                                 wfProfileOut( __METHOD__ );
2261                                                 return false;
2262                                         }
2263                                         $state = self::COLON_STATE_TEXT;
2264                                 }
2265                                 break;
2266                         case self::COLON_STATE_TAGSLASH:
2267                                 if( $c === ">" ) {
2268                                         // Yes, a self-closed tag <blah/>
2269                                         $state = self::COLON_STATE_TEXT;
2270                                 } else {
2271                                         // Probably we're jumping the gun, and this is an attribute
2272                                         $state = self::COLON_STATE_TAG;
2273                                 }
2274                                 break;
2275                         case 5: // self::COLON_STATE_COMMENT:
2276                                 if( $c === "-" ) {
2277                                         $state = self::COLON_STATE_COMMENTDASH;
2278                                 }
2279                                 break;
2280                         case self::COLON_STATE_COMMENTDASH:
2281                                 if( $c === "-" ) {
2282                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2283                                 } else {
2284                                         $state = self::COLON_STATE_COMMENT;
2285                                 }
2286                                 break;
2287                         case self::COLON_STATE_COMMENTDASHDASH:
2288                                 if( $c === ">" ) {
2289                                         $state = self::COLON_STATE_TEXT;
2290                                 } else {
2291                                         $state = self::COLON_STATE_COMMENT;
2292                                 }
2293                                 break;
2294                         default:
2295                                 throw new MWException( "State machine error in " . __METHOD__ );
2296                         }
2297                 }
2298                 if( $stack > 0 ) {
2299                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2300                         return false;
2301                 }
2302                 wfProfileOut( __METHOD__ );
2303                 return false;
2304         }
2305
2306         /**
2307          * Return value of a magic variable (like PAGENAME)
2308          *
2309          * @private
2310          */
2311         function getVariableValue( $index, $frame=false ) {
2312                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2313                 global $wgScriptPath, $wgStylePath;
2314
2315                 /**
2316                  * Some of these require message or data lookups and can be
2317                  * expensive to check many times.
2318                  */
2319                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2320                         if ( isset( $this->mVarCache[$index] ) ) {
2321                                 return $this->mVarCache[$index];
2322                         }
2323                 }
2324
2325                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2326                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2327
2328                 # Use the time zone
2329                 global $wgLocaltimezone;
2330                 if ( isset( $wgLocaltimezone ) ) {
2331                         $oldtz = date_default_timezone_get();
2332                         date_default_timezone_set( $wgLocaltimezone );
2333                 }
2334
2335                 $localTimestamp = date( 'YmdHis', $ts );
2336                 $localMonth = date( 'm', $ts );
2337                 $localMonth1 = date( 'n', $ts );
2338                 $localMonthName = date( 'n', $ts );
2339                 $localDay = date( 'j', $ts );
2340                 $localDay2 = date( 'd', $ts );
2341                 $localDayOfWeek = date( 'w', $ts );
2342                 $localWeek = date( 'W', $ts );
2343                 $localYear = date( 'Y', $ts );
2344                 $localHour = date( 'H', $ts );
2345                 if ( isset( $wgLocaltimezone ) ) {
2346                         date_default_timezone_set( $oldtz );
2347                 }
2348
2349                 switch ( $index ) {
2350                         case 'currentmonth':
2351                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2352                                 break;
2353                         case 'currentmonth1':
2354                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2355                                 break;
2356                         case 'currentmonthname':
2357                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2358                                 break;
2359                         case 'currentmonthnamegen':
2360                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2361                                 break;
2362                         case 'currentmonthabbrev':
2363                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2364                                 break;
2365                         case 'currentday':
2366                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2367                                 break;
2368                         case 'currentday2':
2369                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2370                                 break;
2371                         case 'localmonth':
2372                                 $value = $wgContLang->formatNum( $localMonth );
2373                                 break;
2374                         case 'localmonth1':
2375                                 $value = $wgContLang->formatNum( $localMonth1 );
2376                                 break;
2377                         case 'localmonthname':
2378                                 $value = $wgContLang->getMonthName( $localMonthName );
2379                                 break;
2380                         case 'localmonthnamegen':
2381                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2382                                 break;
2383                         case 'localmonthabbrev':
2384                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2385                                 break;
2386                         case 'localday':
2387                                 $value = $wgContLang->formatNum( $localDay );
2388                                 break;
2389                         case 'localday2':
2390                                 $value = $wgContLang->formatNum( $localDay2 );
2391                                 break;
2392                         case 'pagename':
2393                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2394                                 break;
2395                         case 'pagenamee':
2396                                 $value = $this->mTitle->getPartialURL();
2397                                 break;
2398                         case 'fullpagename':
2399                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2400                                 break;
2401                         case 'fullpagenamee':
2402                                 $value = $this->mTitle->getPrefixedURL();
2403                                 break;
2404                         case 'subpagename':
2405                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2406                                 break;
2407                         case 'subpagenamee':
2408                                 $value = $this->mTitle->getSubpageUrlForm();
2409                                 break;
2410                         case 'basepagename':
2411                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2412                                 break;
2413                         case 'basepagenamee':
2414                                 $value = wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2415                                 break;
2416                         case 'talkpagename':
2417                                 if( $this->mTitle->canTalk() ) {
2418                                         $talkPage = $this->mTitle->getTalkPage();
2419                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2420                                 } else {
2421                                         $value = '';
2422                                 }
2423                                 break;
2424                         case 'talkpagenamee':
2425                                 if( $this->mTitle->canTalk() ) {
2426                                         $talkPage = $this->mTitle->getTalkPage();
2427                                         $value = $talkPage->getPrefixedUrl();
2428                                 } else {
2429                                         $value = '';
2430                                 }
2431                                 break;
2432                         case 'subjectpagename':
2433                                 $subjPage = $this->mTitle->getSubjectPage();
2434                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2435                                 break;
2436                         case 'subjectpagenamee':
2437                                 $subjPage = $this->mTitle->getSubjectPage();
2438                                 $value = $subjPage->getPrefixedUrl();
2439                                 break;
2440                         case 'revisionid':
2441                                 // Let the edit saving system know we should parse the page
2442                                 // *after* a revision ID has been assigned.
2443                                 $this->mOutput->setFlag( 'vary-revision' );
2444                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2445                                 $value = $this->mRevisionId;
2446                                 break;
2447                         case 'revisionday':
2448                                 // Let the edit saving system know we should parse the page
2449                                 // *after* a revision ID has been assigned. This is for null edits.
2450                                 $this->mOutput->setFlag( 'vary-revision' );
2451                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2452                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2453                                 break;
2454                         case 'revisionday2':
2455                                 // Let the edit saving system know we should parse the page
2456                                 // *after* a revision ID has been assigned. This is for null edits.
2457                                 $this->mOutput->setFlag( 'vary-revision' );
2458                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2459                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2460                                 break;
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                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2467                                 break;
2468                         case 'revisionyear':
2469                                 // Let the edit saving system know we should parse the page
2470                                 // *after* a revision ID has been assigned. This is for null edits.
2471                                 $this->mOutput->setFlag( 'vary-revision' );
2472                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2473                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2474                                 break;
2475                         case 'revisiontimestamp':
2476                                 // Let the edit saving system know we should parse the page
2477                                 // *after* a revision ID has been assigned. This is for null edits.
2478                                 $this->mOutput->setFlag( 'vary-revision' );
2479                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2480                                 $value = $this->getRevisionTimestamp();
2481                                 break;
2482                         case 'revisionuser':
2483                                 // Let the edit saving system know we should parse the page
2484                                 // *after* a revision ID has been assigned. This is for null edits.
2485                                 $this->mOutput->setFlag( 'vary-revision' );
2486                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2487                                 $value = $this->getRevisionUser();
2488                                 break;
2489                         case 'namespace':
2490                                 $value = str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2491                                 break;
2492                         case 'namespacee':
2493                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2494                                 break;
2495                         case 'talkspace':
2496                                 $value = $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2497                                 break;
2498                         case 'talkspacee':
2499                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2500                                 break;
2501                         case 'subjectspace':
2502                                 $value = $this->mTitle->getSubjectNsText();
2503                                 break;
2504                         case 'subjectspacee':
2505                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2506                                 break;
2507                         case 'currentdayname':
2508                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2509                                 break;
2510                         case 'currentyear':
2511                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2512                                 break;
2513                         case 'currenttime':
2514                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2515                                 break;
2516                         case 'currenthour':
2517                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2518                                 break;
2519                         case 'currentweek':
2520                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2521                                 // int to remove the padding
2522                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2523                                 break;
2524                         case 'currentdow':
2525                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2526                                 break;
2527                         case 'localdayname':
2528                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2529                                 break;
2530                         case 'localyear':
2531                                 $value = $wgContLang->formatNum( $localYear, true );
2532                                 break;
2533                         case 'localtime':
2534                                 $value = $wgContLang->time( $localTimestamp, false, false );
2535                                 break;
2536                         case 'localhour':
2537                                 $value = $wgContLang->formatNum( $localHour, true );
2538                                 break;
2539                         case 'localweek':
2540                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2541                                 // int to remove the padding
2542                                 $value = $wgContLang->formatNum( (int)$localWeek );
2543                                 break;
2544                         case 'localdow':
2545                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2546                                 break;
2547                         case 'numberofarticles':
2548                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2549                                 break;
2550                         case 'numberoffiles':
2551                                 $value = $wgContLang->formatNum( SiteStats::images() );
2552                                 break;
2553                         case 'numberofusers':
2554                                 $value = $wgContLang->formatNum( SiteStats::users() );
2555                                 break;
2556                         case 'numberofactiveusers':
2557                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2558                                 break;
2559                         case 'numberofpages':
2560                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2561                                 break;
2562                         case 'numberofadmins':
2563                                 $value = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2564                                 break;
2565                         case 'numberofedits':
2566                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2567                                 break;
2568                         case 'numberofviews':
2569                                 $value = $wgContLang->formatNum( SiteStats::views() );
2570                                 break;
2571                         case 'currenttimestamp':
2572                                 $value = wfTimestamp( TS_MW, $ts );
2573                                 break;
2574                         case 'localtimestamp':
2575                                 $value = $localTimestamp;
2576                                 break;
2577                         case 'currentversion':
2578                                 $value = SpecialVersion::getVersion();
2579                                 break;
2580                         case 'sitename':
2581                                 return $wgSitename;
2582                         case 'server':
2583                                 return $wgServer;
2584                         case 'servername':
2585                                 return $wgServerName;
2586                         case 'scriptpath':
2587                                 return $wgScriptPath;
2588                         case 'stylepath':
2589                                 return $wgStylePath;
2590                         case 'directionmark':
2591                                 return $wgContLang->getDirMark();
2592                         case 'contentlanguage':
2593                                 global $wgContLanguageCode;
2594                                 return $wgContLanguageCode;
2595                         default:
2596                                 $ret = null;
2597                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) )
2598                                         return $ret;
2599                                 else
2600                                         return null;
2601                 }
2602
2603                 if ( $index )
2604                         $this->mVarCache[$index] = $value;
2605
2606                 return $value;
2607         }
2608
2609         /**
2610          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2611          *
2612          * @private
2613          */
2614         function initialiseVariables() {
2615                 wfProfileIn( __METHOD__ );
2616                 $variableIDs = MagicWord::getVariableIDs();
2617                 $substIDs = MagicWord::getSubstIDs();
2618
2619                 $this->mVariables = new MagicWordArray( $variableIDs );
2620                 $this->mSubstWords = new MagicWordArray( $substIDs );
2621                 wfProfileOut( __METHOD__ );
2622         }
2623
2624         /**
2625          * Preprocess some wikitext and return the document tree.
2626          * This is the ghost of replace_variables().
2627          *
2628          * @param string $text The text to parse
2629          * @param integer flags Bitwise combination of:
2630          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2631          *                                     included. Default is to assume a direct page view.
2632          *
2633          * The generated DOM tree must depend only on the input text and the flags.
2634          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2635          *
2636          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2637          * change in the DOM tree for a given text, must be passed through the section identifier
2638          * in the section edit link and thus back to extractSections().
2639          *
2640          * The output of this function is currently only cached in process memory, but a persistent
2641          * cache may be implemented at a later date which takes further advantage of these strict
2642          * dependency requirements.
2643          *
2644          * @private
2645          */
2646         function preprocessToDom ( $text, $flags = 0 ) {
2647                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2648                 return $dom;
2649         }
2650
2651         /*
2652          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2653          */
2654         public static function splitWhitespace( $s ) {
2655                 $ltrimmed = ltrim( $s );
2656                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2657                 $trimmed = rtrim( $ltrimmed );
2658                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2659                 if ( $diff > 0 ) {
2660                         $w2 = substr( $ltrimmed, -$diff );
2661                 } else {
2662                         $w2 = '';
2663                 }
2664                 return array( $w1, $trimmed, $w2 );
2665         }
2666
2667         /**
2668          * Replace magic variables, templates, and template arguments
2669          * with the appropriate text. Templates are substituted recursively,
2670          * taking care to avoid infinite loops.
2671          *
2672          * Note that the substitution depends on value of $mOutputType:
2673          *  self::OT_WIKI: only {{subst:}} templates
2674          *  self::OT_PREPROCESS: templates but not extension tags
2675          *  self::OT_HTML: all templates and extension tags
2676          *
2677          * @param string $tex The text to transform
2678          * @param PPFrame $frame Object describing the arguments passed to the template.
2679          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2680          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2681          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2682          * @private
2683          */
2684         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2685                 # Is there any text? Also, Prevent too big inclusions!
2686                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2687                         return $text;
2688                 }
2689                 wfProfileIn( __METHOD__ );
2690
2691                 if ( $frame === false ) {
2692                         $frame = $this->getPreprocessor()->newFrame();
2693                 } elseif ( !( $frame instanceof PPFrame ) ) {
2694                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2695                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2696                 }
2697
2698                 $dom = $this->preprocessToDom( $text );
2699                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2700                 $text = $frame->expand( $dom, $flags );
2701
2702                 wfProfileOut( __METHOD__ );
2703                 return $text;
2704         }
2705
2706         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2707         static function createAssocArgs( $args ) {
2708                 $assocArgs = array();
2709                 $index = 1;
2710                 foreach( $args as $arg ) {
2711                         $eqpos = strpos( $arg, '=' );
2712                         if ( $eqpos === false ) {
2713                                 $assocArgs[$index++] = $arg;
2714                         } else {
2715                                 $name = trim( substr( $arg, 0, $eqpos ) );
2716                                 $value = trim( substr( $arg, $eqpos+1 ) );
2717                                 if ( $value === false ) {
2718                                         $value = '';
2719                                 }
2720                                 if ( $name !== false ) {
2721                                         $assocArgs[$name] = $value;
2722                                 }
2723                         }
2724                 }
2725
2726                 return $assocArgs;
2727         }
2728
2729         /**
2730          * Warn the user when a parser limitation is reached
2731          * Will warn at most once the user per limitation type
2732          *
2733          * @param string $limitationType, should be one of:
2734          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2735          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2736          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2737          * @params int $current, $max When an explicit limit has been
2738          *       exceeded, provide the values (optional)
2739          */
2740         function limitationWarn( $limitationType, $current=null, $max=null) {
2741                 //does no harm if $current and $max are present but are unnecessary for the message
2742                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2743                 $this->mOutput->addWarning( $warning );
2744                 $this->addTrackingCategory( "$limitationType-category" );
2745         }
2746
2747         /**
2748          * Return the text of a template, after recursively
2749          * replacing any variables or templates within the template.
2750          *
2751          * @param array $piece The parts of the template
2752          *  $piece['title']: the title, i.e. the part before the |
2753          *  $piece['parts']: the parameter array
2754          *  $piece['lineStart']: whether the brace was at the start of a line
2755          * @param PPFrame The current frame, contains template arguments
2756          * @return string the text of the template
2757          * @private
2758          */
2759         function braceSubstitution( $piece, $frame ) {
2760                 global $wgContLang, $wgNonincludableNamespaces;
2761                 wfProfileIn( __METHOD__ );
2762                 wfProfileIn( __METHOD__.'-setup' );
2763
2764                 # Flags
2765                 $found = false;             # $text has been filled
2766                 $nowiki = false;            # wiki markup in $text should be escaped
2767                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2768                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2769                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2770                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2771
2772                 # Title object, where $text came from
2773                 $title = null;
2774
2775                 # $part1 is the bit before the first |, and must contain only title characters.
2776                 # Various prefixes will be stripped from it later.
2777                 $titleWithSpaces = $frame->expand( $piece['title'] );
2778                 $part1 = trim( $titleWithSpaces );
2779                 $titleText = false;
2780
2781                 # Original title text preserved for various purposes
2782                 $originalTitle = $part1;
2783
2784                 # $args is a list of argument nodes, starting from index 0, not including $part1
2785                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2786                 wfProfileOut( __METHOD__.'-setup' );
2787
2788                 # SUBST
2789                 wfProfileIn( __METHOD__.'-modifiers' );
2790                 if ( !$found ) {
2791
2792                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
2793
2794                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
2795                         # Decide whether to expand template or keep wikitext as-is.
2796                         if ( $this->ot['wiki'] )
2797                         {
2798                                 if ( $substMatch === false ) {
2799                                         $literal = true;  # literal when in PST with no prefix
2800                                 } else {
2801                                         $literal = false; # expand when in PST with subst: or safesubst:
2802                                 }
2803                         } else {
2804                                 if ( $substMatch == 'subst' ) {
2805                                         $literal = true;  # literal when not in PST with plain subst:
2806                                 } else {
2807                                         $literal = false; # expand when not in PST with safesubst: or no prefix
2808                                 }
2809                         }
2810                         if ( $literal ) {
2811                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2812                                 $isLocalObj = true;
2813                                 $found = true;
2814                         }
2815                 }
2816
2817                 # Variables
2818                 if ( !$found && $args->getLength() == 0 ) {
2819                         $id = $this->mVariables->matchStartToEnd( $part1 );
2820                         if ( $id !== false ) {
2821                                 $text = $this->getVariableValue( $id, $frame );
2822                                 if (MagicWord::getCacheTTL($id)>-1)
2823                                         $this->mOutput->mContainsOldMagic = true;
2824                                 $found = true;
2825                         }
2826                 }
2827
2828                 # MSG, MSGNW and RAW
2829                 if ( !$found ) {
2830                         # Check for MSGNW:
2831                         $mwMsgnw = MagicWord::get( 'msgnw' );
2832                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2833                                 $nowiki = true;
2834                         } else {
2835                                 # Remove obsolete MSG:
2836                                 $mwMsg = MagicWord::get( 'msg' );
2837                                 $mwMsg->matchStartAndRemove( $part1 );
2838                         }
2839
2840                         # Check for RAW:
2841                         $mwRaw = MagicWord::get( 'raw' );
2842                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2843                                 $forceRawInterwiki = true;
2844                         }
2845                 }
2846                 wfProfileOut( __METHOD__.'-modifiers' );
2847
2848                 # Parser functions
2849                 if ( !$found ) {
2850                         wfProfileIn( __METHOD__ . '-pfunc' );
2851
2852                         $colonPos = strpos( $part1, ':' );
2853                         if ( $colonPos !== false ) {
2854                                 # Case sensitive functions
2855                                 $function = substr( $part1, 0, $colonPos );
2856                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2857                                         $function = $this->mFunctionSynonyms[1][$function];
2858                                 } else {
2859                                         # Case insensitive functions
2860                                         $function = $wgContLang->lc( $function );
2861                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2862                                                 $function = $this->mFunctionSynonyms[0][$function];
2863                                         } else {
2864                                                 $function = false;
2865                                         }
2866                                 }
2867                                 if ( $function ) {
2868                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2869                                         $initialArgs = array( &$this );
2870                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2871                                         if ( $flags & SFH_OBJECT_ARGS ) {
2872                                                 # Add a frame parameter, and pass the arguments as an array
2873                                                 $allArgs = $initialArgs;
2874                                                 $allArgs[] = $frame;
2875                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2876                                                         $funcArgs[] = $args->item( $i );
2877                                                 }
2878                                                 $allArgs[] = $funcArgs;
2879                                         } else {
2880                                                 # Convert arguments to plain text
2881                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2882                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2883                                                 }
2884                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2885                                         }
2886
2887                                         # Workaround for PHP bug 35229 and similar
2888                                         if ( !is_callable( $callback ) ) {
2889                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2890                                                 wfProfileOut( __METHOD__ );
2891                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2892                                         }
2893                                         $result = call_user_func_array( $callback, $allArgs );
2894                                         $found = true;
2895                                         $noparse = true;
2896                                         $preprocessFlags = 0;
2897
2898                                         if ( is_array( $result ) ) {
2899                                                 if ( isset( $result[0] ) ) {
2900                                                         $text = $result[0];
2901                                                         unset( $result[0] );
2902                                                 }
2903
2904                                                 // Extract flags into the local scope
2905                                                 // This allows callers to set flags such as nowiki, found, etc.
2906                                                 extract( $result );
2907                                         } else {
2908                                                 $text = $result;
2909                                         }
2910                                         if ( !$noparse ) {
2911                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2912                                                 $isChildObj = true;
2913                                         }
2914                                 }
2915                         }
2916                         wfProfileOut( __METHOD__ . '-pfunc' );
2917                 }
2918
2919                 # Finish mangling title and then check for loops.
2920                 # Set $title to a Title object and $titleText to the PDBK
2921                 if ( !$found ) {
2922                         $ns = NS_TEMPLATE;
2923                         # Split the title into page and subpage
2924                         $subpage = '';
2925                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2926                         if ($subpage !== '') {
2927                                 $ns = $this->mTitle->getNamespace();
2928                         }
2929                         $title = Title::newFromText( $part1, $ns );
2930                         if ( $title ) {
2931                                 $titleText = $title->getPrefixedText();
2932                                 # Check for language variants if the template is not found
2933                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2934                                         $wgContLang->findVariantLink( $part1, $title, true );
2935                                 }
2936                                 # Do recursion depth check
2937                                 $limit = $this->mOptions->getMaxTemplateDepth();
2938                                 if ( $frame->depth >= $limit ) {
2939                                         $found = true;
2940                                         $text = '<span class="error">' . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit ) . '</span>';
2941                                 }
2942                         }
2943                 }
2944
2945                 # Load from database
2946                 if ( !$found && $title ) {
2947                         wfProfileIn( __METHOD__ . '-loadtpl' );
2948                         if ( !$title->isExternal() ) {
2949                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2950                                         $text = SpecialPage::capturePath( $title );
2951                                         if ( is_string( $text ) ) {
2952                                                 $found = true;
2953                                                 $isHTML = true;
2954                                                 $this->disableCache();
2955                                         }
2956                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2957                                         $found = false; //access denied
2958                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2959                                 } else {
2960                                         list( $text, $title ) = $this->getTemplateDom( $title );
2961                                         if ( $text !== false ) {
2962                                                 $found = true;
2963                                                 $isChildObj = true;
2964                                         }
2965                                 }
2966
2967                                 # If the title is valid but undisplayable, make a link to it
2968                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2969                                         $text = "[[:$titleText]]";
2970                                         $found = true;
2971                                 }
2972                         } elseif ( $title->isTrans() ) {
2973                                 // Interwiki transclusion
2974                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2975                                         $text = $this->interwikiTransclude( $title, 'render' );
2976                                         $isHTML = true;
2977                                 } else {
2978                                         $text = $this->interwikiTransclude( $title, 'raw' );
2979                                         // Preprocess it like a template
2980                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2981                                         $isChildObj = true;
2982                                 }
2983                                 $found = true;
2984                         }
2985
2986                         # Do infinite loop check
2987                         # This has to be done after redirect resolution to avoid infinite loops via redirects
2988                         if ( !$frame->loopCheck( $title ) ) {
2989                                 $found = true;
2990                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
2991                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2992                         }
2993                         wfProfileOut( __METHOD__ . '-loadtpl' );
2994                 }
2995
2996                 # If we haven't found text to substitute by now, we're done
2997                 # Recover the source wikitext and return it
2998                 if ( !$found ) {
2999                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3000                         wfProfileOut( __METHOD__ );
3001                         return array( 'object' => $text );
3002                 }
3003
3004                 # Expand DOM-style return values in a child frame
3005                 if ( $isChildObj ) {
3006                         # Clean up argument array
3007                         $newFrame = $frame->newChild( $args, $title );
3008
3009                         if ( $nowiki ) {
3010                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3011                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3012                                 # Expansion is eligible for the empty-frame cache
3013                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3014                                         $text = $this->mTplExpandCache[$titleText];
3015                                 } else {
3016                                         $text = $newFrame->expand( $text );
3017                                         $this->mTplExpandCache[$titleText] = $text;
3018                                 }
3019                         } else {
3020                                 # Uncached expansion
3021                                 $text = $newFrame->expand( $text );
3022                         }
3023                 }
3024                 if ( $isLocalObj && $nowiki ) {
3025                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3026                         $isLocalObj = false;
3027                 }
3028
3029                 # Replace raw HTML by a placeholder
3030                 # Add a blank line preceding, to prevent it from mucking up
3031                 # immediately preceding headings
3032                 if ( $isHTML ) {
3033                         $text = "\n\n" . $this->insertStripItem( $text );
3034                 }
3035                 # Escape nowiki-style return values
3036                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3037                         $text = wfEscapeWikiText( $text );
3038                 }
3039                 # Bug 529: if the template begins with a table or block-level
3040                 # element, it should be treated as beginning a new line.
3041                 # This behaviour is somewhat controversial.
3042                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3043                         $text = "\n" . $text;
3044                 }
3045
3046                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3047                         # Error, oversize inclusion
3048                         $text = "[[$originalTitle]]" .
3049                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3050                         $this->limitationWarn( 'post-expand-template-inclusion' );
3051                 }
3052
3053                 if ( $isLocalObj ) {
3054                         $ret = array( 'object' => $text );
3055                 } else {
3056                         $ret = array( 'text' => $text );
3057                 }
3058
3059                 wfProfileOut( __METHOD__ );
3060                 return $ret;
3061         }
3062
3063         /**
3064          * Get the semi-parsed DOM representation of a template with a given title,
3065          * and its redirect destination title. Cached.
3066          */
3067         function getTemplateDom( $title ) {
3068                 $cacheTitle = $title;
3069                 $titleText = $title->getPrefixedDBkey();
3070
3071                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3072                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3073                         $title = Title::makeTitle( $ns, $dbk );
3074                         $titleText = $title->getPrefixedDBkey();
3075                 }
3076                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3077                         return array( $this->mTplDomCache[$titleText], $title );
3078                 }
3079
3080                 // Cache miss, go to the database
3081                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3082
3083                 if ( $text === false ) {
3084                         $this->mTplDomCache[$titleText] = false;
3085                         return array( false, $title );
3086                 }
3087
3088                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3089                 $this->mTplDomCache[ $titleText ] = $dom;
3090
3091                 if (! $title->equals($cacheTitle)) {
3092                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3093                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3094                 }
3095
3096                 return array( $dom, $title );
3097         }
3098
3099         /**
3100          * Fetch the unparsed text of a template and register a reference to it.
3101          */
3102         function fetchTemplateAndTitle( $title ) {
3103                 $templateCb = $this->mOptions->getTemplateCallback();
3104                 $stuff = call_user_func( $templateCb, $title, $this );
3105                 $text = $stuff['text'];
3106                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3107                 if ( isset( $stuff['deps'] ) ) {
3108                         foreach ( $stuff['deps'] as $dep ) {
3109                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3110                         }
3111                 }
3112                 return array($text,$finalTitle);
3113         }
3114
3115         function fetchTemplate( $title ) {
3116                 $rv = $this->fetchTemplateAndTitle($title);
3117                 return $rv[0];
3118         }
3119
3120         /**
3121          * Static function to get a template
3122          * Can be overridden via ParserOptions::setTemplateCallback().
3123          */
3124         static function statelessFetchTemplate( $title, $parser=false ) {
3125                 $text = $skip = false;
3126                 $finalTitle = $title;
3127                 $deps = array();
3128
3129                 // Loop to fetch the article, with up to 1 redirect
3130                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3131                         # Give extensions a chance to select the revision instead
3132                         $id = false; // Assume current
3133                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3134
3135                         if( $skip ) {
3136                                 $text = false;
3137                                 $deps[] = array(
3138                                         'title' => $title,
3139                                         'page_id' => $title->getArticleID(),
3140                                         'rev_id' => null );
3141                                 break;
3142                         }
3143                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3144                         $rev_id = $rev ? $rev->getId() : 0;
3145                         // If there is no current revision, there is no page
3146                         if( $id === false && !$rev ) {
3147                                 $linkCache = LinkCache::singleton();
3148                                 $linkCache->addBadLinkObj( $title );
3149                         }
3150
3151                         $deps[] = array(
3152                                 'title' => $title,
3153                                 'page_id' => $title->getArticleID(),
3154                                 'rev_id' => $rev_id );
3155
3156                         if( $rev ) {
3157                                 $text = $rev->getText();
3158                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3159                                 global $wgContLang;
3160                                 $message = $wgContLang->lcfirst( $title->getText() );
3161                                 $text = wfMsgForContentNoTrans( $message );
3162                                 if( wfEmptyMsg( $message, $text ) ) {
3163                                         $text = false;
3164                                         break;
3165                                 }
3166                         } else {
3167                                 break;
3168                         }
3169                         if ( $text === false ) {
3170                                 break;
3171                         }
3172                         // Redirect?
3173                         $finalTitle = $title;
3174                         $title = Title::newFromRedirect( $text );
3175                 }
3176                 return array(
3177                         'text' => $text,
3178                         'finalTitle' => $finalTitle,
3179                         'deps' => $deps );
3180         }
3181
3182         /**
3183          * Transclude an interwiki link.
3184          */
3185         function interwikiTransclude( $title, $action ) {
3186                 global $wgEnableScaryTranscluding;
3187
3188                 if (!$wgEnableScaryTranscluding)
3189                         return wfMsg('scarytranscludedisabled');
3190
3191                 $url = $title->getFullUrl( "action=$action" );
3192
3193                 if (strlen($url) > 255)
3194                         return wfMsg('scarytranscludetoolong');
3195                 return $this->fetchScaryTemplateMaybeFromCache($url);
3196         }
3197
3198         function fetchScaryTemplateMaybeFromCache($url) {
3199                 global $wgTranscludeCacheExpiry;
3200                 $dbr = wfGetDB(DB_SLAVE);
3201                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3202                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3203                                 array('tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3204                 if ($obj) {
3205                         return $obj->tc_contents;
3206                 }
3207
3208                 $text = Http::get($url);
3209                 if (!$text)
3210                         return wfMsg('scarytranscludefailed', $url);
3211
3212                 $dbw = wfGetDB(DB_MASTER);
3213                 $dbw->replace('transcache', array('tc_url'), array(
3214                         'tc_url' => $url,
3215                         'tc_time' => $dbw->timestamp( time() ),
3216                         'tc_contents' => $text));
3217                 return $text;
3218         }
3219
3220
3221         /**
3222          * Triple brace replacement -- used for template arguments
3223          * @private
3224          */
3225         function argSubstitution( $piece, $frame ) {
3226                 wfProfileIn( __METHOD__ );
3227
3228                 $error = false;
3229                 $parts = $piece['parts'];
3230                 $nameWithSpaces = $frame->expand( $piece['title'] );
3231                 $argName = trim( $nameWithSpaces );
3232                 $object = false;
3233                 $text = $frame->getArgument( $argName );
3234                 if (  $text === false && $parts->getLength() > 0
3235                   && (
3236                     $this->ot['html']
3237                     || $this->ot['pre']
3238                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3239                   )
3240                 ) {
3241                         # No match in frame, use the supplied default
3242                         $object = $parts->item( 0 )->getChildren();
3243                 }
3244                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3245                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3246                         $this->limitationWarn( 'post-expand-template-argument' );
3247                 }
3248
3249                 if ( $text === false && $object === false ) {
3250                         # No match anywhere
3251                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3252                 }
3253                 if ( $error !== false ) {
3254                         $text .= $error;
3255                 }
3256                 if ( $object !== false ) {
3257                         $ret = array( 'object' => $object );
3258                 } else {
3259                         $ret = array( 'text' => $text );
3260                 }
3261
3262                 wfProfileOut( __METHOD__ );
3263                 return $ret;
3264         }
3265
3266         /**
3267          * Return the text to be used for a given extension tag.
3268          * This is the ghost of strip().
3269          *
3270          * @param array $params Associative array of parameters:
3271          *     name       PPNode for the tag name
3272          *     attr       PPNode for unparsed text where tag attributes are thought to be
3273          *     attributes Optional associative array of parsed attributes
3274          *     inner      Contents of extension element
3275          *     noClose    Original text did not have a close tag
3276          * @param PPFrame $frame
3277          */
3278         function extensionSubstitution( $params, $frame ) {
3279                 global $wgRawHtml, $wgContLang;
3280
3281                 $name = $frame->expand( $params['name'] );
3282                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3283                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3284                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3285
3286                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3287                         ( $this->ot['html'] || $this->ot['pre'] );
3288                 if ( $isFunctionTag ) {
3289                         $markerType = 'none';
3290                 } else {
3291                         $markerType = 'general';
3292                 }
3293                 if ( $this->ot['html'] || $isFunctionTag ) {
3294                         $name = strtolower( $name );
3295                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3296                         if ( isset( $params['attributes'] ) ) {
3297                                 $attributes = $attributes + $params['attributes'];
3298                         }
3299
3300                         if( isset( $this->mTagHooks[$name] ) ) {
3301                                 # Workaround for PHP bug 35229 and similar
3302                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3303                                         throw new MWException( "Tag hook for $name is not callable\n" );
3304                                 }
3305                                 $output = call_user_func_array( $this->mTagHooks[$name],
3306                                         array( $content, $attributes, $this, $frame ) );
3307                         } elseif( isset( $this->mFunctionTagHooks[$name] ) ) {
3308                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3309                                 if( !is_callable( $callback ) )
3310                                         throw new MWException( "Tag hook for $name is not callable\n" );
3311
3312                                 $output = call_user_func_array( $callback,
3313                                         array( &$this, $frame, $content, $attributes ) );
3314                         } else {
3315                                 $output = '<span class="error">Invalid tag extension name: ' .
3316                                         htmlspecialchars( $name ) . '</span>';
3317                         }
3318
3319                         if ( is_array( $output ) ) {
3320                                 // Extract flags to local scope (to override $markerType)
3321                                 $flags = $output;
3322                                 $output = $flags[0];
3323                                 unset( $flags[0] );
3324                                 extract( $flags );
3325                         }
3326                 } else {
3327                         if ( is_null( $attrText ) ) {
3328                                 $attrText = '';
3329                         }
3330                         if ( isset( $params['attributes'] ) ) {
3331                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3332                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3333                                                 htmlspecialchars( $attrValue ) . '"';
3334                                 }
3335                         }
3336                         if ( $content === null ) {
3337                                 $output = "<$name$attrText/>";
3338                         } else {
3339                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3340                                 $output = "<$name$attrText>$content$close";
3341                         }
3342                 }
3343
3344                 if( $markerType === 'none' ) {
3345                         return $output;
3346                 } elseif ( $markerType === 'nowiki' ) {
3347                         $this->mStripState->nowiki->setPair( $marker, $output );
3348                 } elseif ( $markerType === 'general' ) {
3349                         $this->mStripState->general->setPair( $marker, $output );
3350                 } else {
3351                         throw new MWException( __METHOD__.': invalid marker type' );
3352                 }
3353                 return $marker;
3354         }
3355
3356         /**
3357          * Increment an include size counter
3358          *
3359          * @param string $type The type of expansion
3360          * @param integer $size The size of the text
3361          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3362          */
3363         function incrementIncludeSize( $type, $size ) {
3364                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3365                         return false;
3366                 } else {
3367                         $this->mIncludeSizes[$type] += $size;
3368                         return true;
3369                 }
3370         }
3371
3372         /**
3373          * Increment the expensive function count
3374          *
3375          * @return boolean False if the limit has been exceeded
3376          */
3377         function incrementExpensiveFunctionCount() {
3378                 global $wgExpensiveParserFunctionLimit;
3379                 $this->mExpensiveFunctionCount++;
3380                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3381                         return true;
3382                 }
3383                 return false;
3384         }
3385
3386         /**
3387          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3388          * Fills $this->mDoubleUnderscores, returns the modified text
3389          */
3390         function doDoubleUnderscore( $text ) {
3391                 wfProfileIn( __METHOD__ );
3392
3393                 // The position of __TOC__ needs to be recorded
3394                 $mw = MagicWord::get( 'toc' );
3395                 if( $mw->match( $text ) ) {
3396                         $this->mShowToc = true;
3397                         $this->mForceTocPosition = true;
3398
3399                         // Set a placeholder. At the end we'll fill it in with the TOC.
3400                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3401
3402                         // Only keep the first one.
3403                         $text = $mw->replace( '', $text );
3404                 }
3405
3406                 // Now match and remove the rest of them
3407                 $mwa = MagicWord::getDoubleUnderscoreArray();
3408                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3409
3410                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3411                         $this->mOutput->mNoGallery = true;
3412                 }
3413                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3414                         $this->mShowToc = false;
3415                 }
3416                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3417                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3418                         $this->addTrackingCategory( 'hidden-category-category' );
3419                 }
3420                 # (bug 8068) Allow control over whether robots index a page.
3421                 #
3422                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3423                 # is not desirable, the last one on the page should win.
3424                 if( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3425                         $this->mOutput->setIndexPolicy( 'noindex' );
3426                         $this->addTrackingCategory( 'noindex-category' );
3427                 }
3428                 if( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ){
3429                         $this->mOutput->setIndexPolicy( 'index' );
3430                         $this->addTrackingCategory( 'index-category' );
3431                 }
3432
3433                 wfProfileOut( __METHOD__ );
3434                 return $text;
3435         }
3436
3437         /**
3438          * Add a tracking category, getting the title from a system message,
3439          * or print a debug message if the title is invalid.
3440          * @param $msg String message key
3441          * @return Bool whether the addition was successful
3442          */
3443         protected function addTrackingCategory( $msg ){
3444                 $cat = wfMsgForContent( $msg );
3445
3446                 # Allow tracking categories to be disabled by setting them to "-"
3447                 if( $cat === '-' ) return false;
3448
3449                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3450                 if ( $containerCategory ) {
3451                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3452                         return true;
3453                 } else {
3454                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3455                         return false;
3456                 }
3457         }
3458
3459         /**
3460          * This function accomplishes several tasks:
3461          * 1) Auto-number headings if that option is enabled
3462          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3463          * 3) Add a Table of contents on the top for users who have enabled the option
3464          * 4) Auto-anchor headings
3465          *
3466          * It loops through all headlines, collects the necessary data, then splits up the
3467          * string and re-inserts the newly formatted headlines.
3468          *
3469          * @param string $text
3470          * @param string $origText Original, untouched wikitext
3471          * @param boolean $isMain
3472          * @private
3473          */
3474         function formatHeadings( $text, $origText, $isMain=true ) {
3475                 global $wgMaxTocLevel, $wgContLang, $wgHtml5, $wgExperimentalHtmlIds;
3476
3477                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3478                 $showEditLink = $this->mOptions->getEditSection();
3479
3480                 // Do not call quickUserCan unless necessary
3481                 if( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3482                         $showEditLink = 0;
3483                 }
3484
3485                 # Inhibit editsection links if requested in the page
3486                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3487                         $showEditLink = 0;
3488                 }
3489
3490                 # Get all headlines for numbering them and adding funky stuff like [edit]
3491                 # links - this is for later, but we need the number of headlines right now
3492                 $matches = array();
3493                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3494
3495                 # if there are fewer than 4 headlines in the article, do not show TOC
3496                 # unless it's been explicitly enabled.
3497                 $enoughToc = $this->mShowToc &&
3498                         (($numMatches >= 4) || $this->mForceTocPosition);
3499
3500                 # Allow user to stipulate that a page should have a "new section"
3501                 # link added via __NEWSECTIONLINK__
3502                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3503                         $this->mOutput->setNewSection( true );
3504                 }
3505
3506                 # Allow user to remove the "new section"
3507                 # link via __NONEWSECTIONLINK__
3508                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3509                         $this->mOutput->hideNewSection( true );
3510                 }
3511
3512                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3513                 # override above conditions and always show TOC above first header
3514                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3515                         $this->mShowToc = true;
3516                         $enoughToc = true;
3517                 }
3518
3519                 # We need this to perform operations on the HTML
3520                 $sk = $this->mOptions->getSkin();
3521
3522                 # headline counter
3523                 $headlineCount = 0;
3524                 $numVisible = 0;
3525
3526                 # Ugh .. the TOC should have neat indentation levels which can be
3527                 # passed to the skin functions. These are determined here
3528                 $toc = '';
3529                 $full = '';
3530                 $head = array();
3531                 $sublevelCount = array();
3532                 $levelCount = array();
3533                 $toclevel = 0;
3534                 $level = 0;
3535                 $prevlevel = 0;
3536                 $toclevel = 0;
3537                 $prevtoclevel = 0;
3538                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3539                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3540                 $oldType = $this->mOutputType;
3541                 $this->setOutputType( self::OT_WIKI );
3542                 $frame = $this->getPreprocessor()->newFrame();
3543                 $root = $this->preprocessToDom( $origText );
3544                 $node = $root->getFirstChild();
3545                 $byteOffset = 0;
3546                 $tocraw = array();
3547
3548                 foreach( $matches[3] as $headline ) {
3549                         $isTemplate = false;
3550                         $titleText = false;
3551                         $sectionIndex = false;
3552                         $numbering = '';
3553                         $markerMatches = array();
3554                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3555                                 $serial = $markerMatches[1];
3556                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3557                                 $isTemplate = ($titleText != $baseTitleText);
3558                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3559                         }
3560
3561                         if( $toclevel ) {
3562                                 $prevlevel = $level;
3563                                 $prevtoclevel = $toclevel;
3564                         }
3565                         $level = $matches[1][$headlineCount];
3566
3567                         if ( $level > $prevlevel ) {
3568                                 # Increase TOC level
3569                                 $toclevel++;
3570                                 $sublevelCount[$toclevel] = 0;
3571                                 if( $toclevel<$wgMaxTocLevel ) {
3572                                         $prevtoclevel = $toclevel;
3573                                         $toc .= $sk->tocIndent();
3574                                         $numVisible++;
3575                                 }
3576                         }
3577                         elseif ( $level < $prevlevel && $toclevel > 1 ) {
3578                                 # Decrease TOC level, find level to jump to
3579
3580                                 for ($i = $toclevel; $i > 0; $i--) {
3581                                         if ( $levelCount[$i] == $level ) {
3582                                                 # Found last matching level
3583                                                 $toclevel = $i;
3584                                                 break;
3585                                         }
3586                                         elseif ( $levelCount[$i] < $level ) {
3587                                                 # Found first matching level below current level
3588                                                 $toclevel = $i + 1;
3589                                                 break;
3590                                         }
3591                                 }
3592                                 if( $i == 0 ) $toclevel = 1;
3593                                 if( $toclevel<$wgMaxTocLevel ) {
3594                                         if($prevtoclevel < $wgMaxTocLevel) {
3595                                                 # Unindent only if the previous toc level was shown :p
3596                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3597                                                 $prevtoclevel = $toclevel;
3598                                         } else {
3599                                                 $toc .= $sk->tocLineEnd();
3600                                         }
3601                                 }
3602                         }
3603                         else {
3604                                 # No change in level, end TOC line
3605                                 if( $toclevel<$wgMaxTocLevel ) {
3606                                         $toc .= $sk->tocLineEnd();
3607                                 }
3608                         }
3609
3610                         $levelCount[$toclevel] = $level;
3611
3612                         # count number of headlines for each level
3613                         @$sublevelCount[$toclevel]++;
3614                         $dot = 0;
3615                         for( $i = 1; $i <= $toclevel; $i++ ) {
3616                                 if( !empty( $sublevelCount[$i] ) ) {
3617                                         if( $dot ) {
3618                                                 $numbering .= '.';
3619                                         }
3620                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3621                                         $dot = 1;
3622                                 }
3623                         }
3624
3625                         # The safe header is a version of the header text safe to use for links
3626                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3627                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3628
3629                         # Remove link placeholders by the link text.
3630                         #     <!--LINK number-->
3631                         # turns into
3632                         #     link text with suffix
3633                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3634
3635                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3636                         $tocline = preg_replace(
3637                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3638                                 array( '',                          '<$1>'),
3639                                 $safeHeadline
3640                         );
3641                         $tocline = trim( $tocline );
3642
3643                         # For the anchor, strip out HTML-y stuff period
3644                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3645                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3646                         $safeHeadline = trim( $safeHeadline );
3647
3648                         # Save headline for section edit hint before it's escaped
3649                         $headlineHint = $safeHeadline;
3650
3651                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
3652                                 # For reverse compatibility, provide an id that's
3653                                 # HTML4-compatible, like we used to.
3654                                 #
3655                                 # It may be worth noting, academically, that it's possible for
3656                                 # the legacy anchor to conflict with a non-legacy headline
3657                                 # anchor on the page.  In this case likely the "correct" thing
3658                                 # would be to either drop the legacy anchors or make sure
3659                                 # they're numbered first.  However, this would require people
3660                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3661                                 # manually, so let's not bother worrying about it.
3662                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3663                                         array( 'noninitial', 'legacy' ) );
3664                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3665
3666                                 if ( $legacyHeadline == $safeHeadline ) {
3667                                         # No reason to have both (in fact, we can't)
3668                                         $legacyHeadline = false;
3669                                 }
3670                         } else {
3671                                 $legacyHeadline = false;
3672                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3673                                         'noninitial' );
3674                         }
3675
3676                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3677                         # Does this apply to Unicode characters?  Because we aren't
3678                         # handling those here.
3679                         $arrayKey = strtolower( $safeHeadline );
3680                         if ( $legacyHeadline === false ) {
3681                                 $legacyArrayKey = false;
3682                         } else {
3683                                 $legacyArrayKey = strtolower( $legacyHeadline );
3684                         }
3685
3686                         # count how many in assoc. array so we can track dupes in anchors
3687                         if ( isset( $refers[$arrayKey] ) ) {
3688                                 $refers[$arrayKey]++;
3689                         } else {
3690                                 $refers[$arrayKey] = 1;
3691                         }
3692                         if ( isset( $refers[$legacyArrayKey] ) ) {
3693                                 $refers[$legacyArrayKey]++;
3694                         } else {
3695                                 $refers[$legacyArrayKey] = 1;
3696                         }
3697
3698                         # Don't number the heading if it is the only one (looks silly)
3699                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3700                                 # the two are different if the line contains a link
3701                                 $headline = $numbering . ' ' . $headline;
3702                         }
3703
3704                         # Create the anchor for linking from the TOC to the section
3705                         $anchor = $safeHeadline;
3706                         $legacyAnchor = $legacyHeadline;
3707                         if ( $refers[$arrayKey] > 1 ) {
3708                                 $anchor .= '_' . $refers[$arrayKey];
3709                         }
3710                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3711                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3712                         }
3713                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3714                                 $toc .= $sk->tocLine($anchor, $tocline,
3715                                         $numbering, $toclevel, ($isTemplate ? false : $sectionIndex));
3716                         }
3717
3718                         # Add the section to the section tree
3719                         # Find the DOM node for this header
3720                         while ( $node && !$isTemplate ) {
3721                                 if ( $node->getName() === 'h' ) {
3722                                         $bits = $node->splitHeading();
3723                                         if ( $bits['i'] == $sectionIndex )
3724                                                 break;
3725                                 }
3726                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3727                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3728                                 $node = $node->getNextSibling();
3729                         }
3730                         $tocraw[] = array(
3731                                 'toclevel' => $toclevel,
3732                                 'level' => $level,
3733                                 'line' => $tocline,
3734                                 'number' => $numbering,
3735                                 'index' => ($isTemplate ? 'T-' : '' ) . $sectionIndex,
3736                                 'fromtitle' => $titleText,
3737                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3738                                 'anchor' => $anchor,
3739                         );
3740
3741                         # give headline the correct <h#> tag
3742                         if( $showEditLink && $sectionIndex !== false ) {
3743                                 if( $isTemplate ) {
3744                                         # Put a T flag in the section identifier, to indicate to extractSections()
3745                                         # that sections inside <includeonly> should be counted.
3746                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3747                                 } else {
3748                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3749                                 }
3750                         } else {
3751                                 $editlink = '';
3752                         }
3753                         $head[$headlineCount] = $sk->makeHeadline( $level,
3754                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3755                                 $editlink, $legacyAnchor );
3756
3757                         $headlineCount++;
3758                 }
3759
3760                 $this->setOutputType( $oldType );
3761
3762                 # Never ever show TOC if no headers
3763                 if( $numVisible < 1 ) {
3764                         $enoughToc = false;
3765                 }
3766
3767                 if( $enoughToc ) {
3768                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3769                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3770                         }
3771                         $toc = $sk->tocList( $toc );
3772                         $this->mOutput->setTOCHTML( $toc );
3773                 }
3774
3775                 if ( $isMain ) {
3776                         $this->mOutput->setSections( $tocraw );
3777                 }
3778
3779                 # split up and insert constructed headlines
3780
3781                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3782                 $i = 0;
3783
3784                 foreach( $blocks as $block ) {
3785                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3786                                 # This is the [edit] link that appears for the top block of text when
3787                                 # section editing is enabled
3788
3789                                 # Disabled because it broke block formatting
3790                                 # For example, a bullet point in the top line
3791                                 # $full .= $sk->editSectionLink(0);
3792                         }
3793                         $full .= $block;
3794                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3795                                 # Top anchor now in skin
3796                                 $full = $full.$toc;
3797                         }
3798
3799                         if( !empty( $head[$i] ) ) {
3800                                 $full .= $head[$i];
3801                         }
3802                         $i++;
3803                 }
3804                 if( $this->mForceTocPosition ) {
3805                         return str_replace( '<!--MWTOC-->', $toc, $full );
3806                 } else {
3807                         return $full;
3808                 }
3809         }
3810
3811         /**
3812          * Merge $tree2 into $tree1 by replacing the section with index
3813          * $section in $tree1 and its descendants with the sections in $tree2.
3814          * Note that in the returned section tree, only the 'index' and
3815          * 'byteoffset' fields are guaranteed to be correct.
3816          * @param $tree1 array Section tree from ParserOutput::getSectons()
3817         *  @param $tree2 array Section tree
3818          * @param $section int Section index
3819          * @param $title Title Title both section trees come from
3820          * @param $len2 int Length of the original wikitext for $tree2
3821          * @return array Merged section tree
3822          */
3823         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3824                 global $wgContLang;
3825                 $newTree = array();
3826                 $targetLevel = false;
3827                 $merged = false;
3828                 $lastLevel = 1;
3829                 $nextIndex = 1;
3830                 $numbering = array( 0 );
3831                 $titletext = $title->getPrefixedDBkey();
3832                 foreach ( $tree1 as $s ) {
3833                         if ( $targetLevel !== false ) {
3834                                 if ( $s['level'] <= $targetLevel )
3835                                         // We've skipped enough
3836                                         $targetLevel = false;
3837                                 else
3838                                         continue;
3839                         }
3840                         if ( $s['index'] != $section ||
3841                                         $s['fromtitle'] != $titletext ) {
3842                                 self::incrementNumbering( $numbering,
3843                                         $s['toclevel'], $lastLevel );
3844
3845                                 // Rewrite index, byteoffset and number
3846                                 if ( $s['fromtitle'] == $titletext ) {
3847                                         $s['index'] = $nextIndex++;
3848                                         if ( $merged )
3849                                                 $s['byteoffset'] += $len2;
3850                                 }
3851                                 $s['number']  = implode( '.', array_map(
3852                                         array( $wgContLang, 'formatnum' ),
3853                                         $numbering ) );
3854                                 $lastLevel = $s['toclevel'];
3855                                 $newTree[] = $s;
3856                         } else {
3857                                 // We're at $section
3858                                 // Insert sections from $tree2 here
3859                                 foreach ( $tree2 as $s2 ) {
3860                                         // Rewrite the fields in $s2
3861                                         // before inserting it
3862                                         $s2['toclevel'] += $s['toclevel'] - 1;
3863                                         $s2['level'] += $s['level'] - 1;
3864                                         $s2['index'] = $nextIndex++;
3865                                         $s2['byteoffset'] += $s['byteoffset'];
3866
3867                                         self::incrementNumbering( $numbering,
3868                                                 $s2['toclevel'], $lastLevel );
3869                                         $s2['number']  = implode( '.', array_map(
3870                                                 array( $wgContLang, 'formatnum' ),
3871                                                 $numbering ) );
3872                                         $lastLevel = $s2['toclevel'];
3873                                         $newTree[] = $s2;
3874                                 }
3875                                 // Skip all descendants of $section in $tree1
3876                                 $targetLevel = $s['level'];
3877                                 $merged = true;
3878                         }
3879                 }
3880                 return $newTree;
3881         }
3882
3883         /**
3884          * Increment a section number. Helper function for mergeSectionTrees()
3885          * @param $number array Array representing a section number
3886          * @param $level int Current TOC level (depth)
3887          * @param $lastLevel int Level of previous TOC entry
3888          */
3889         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3890                 if ( $level > $lastLevel )
3891                         $number[$level - 1] = 1;
3892                 else if ( $level < $lastLevel ) {
3893                         foreach ( $number as $key => $unused )
3894                                 if ( $key >= $level )
3895                                         unset( $number[$key] );
3896                         $number[$level - 1]++;
3897                 } else
3898                         $number[$level - 1]++;
3899         }
3900
3901         /**
3902          * Transform wiki markup when saving a page by doing \r\n -> \n
3903          * conversion, substitting signatures, {{subst:}} templates, etc.
3904          *
3905          * @param string $text the text to transform
3906          * @param Title &$title the Title object for the current article
3907          * @param User $user the User object describing the current user
3908          * @param ParserOptions $options parsing options
3909          * @param bool $clearState whether to clear the parser state first
3910          * @return string the altered wiki markup
3911          * @public
3912          */
3913         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
3914                 $this->mOptions = $options;
3915                 $this->setTitle( $title );
3916                 $this->setOutputType( self::OT_WIKI );
3917
3918                 if ( $clearState ) {
3919                         $this->clearState();
3920                 }
3921
3922                 $pairs = array(
3923                         "\r\n" => "\n",
3924                 );
3925                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3926                 $text = $this->pstPass2( $text, $user );
3927                 $text = $this->mStripState->unstripBoth( $text );
3928                 return $text;
3929         }
3930
3931         /**
3932          * Pre-save transform helper function
3933          * @private
3934          */
3935         function pstPass2( $text, $user ) {
3936                 global $wgContLang, $wgLocaltimezone;
3937
3938                 /* Note: This is the timestamp saved as hardcoded wikitext to
3939                  * the database, we use $wgContLang here in order to give
3940                  * everyone the same signature and use the default one rather
3941                  * than the one selected in each user's preferences.
3942                  *
3943                  * (see also bug 12815)
3944                  */
3945                 $ts = $this->mOptions->getTimestamp();
3946                 if ( isset( $wgLocaltimezone ) ) {
3947                         $tz = $wgLocaltimezone;
3948                 } else {
3949                         $tz = date_default_timezone_get();
3950                 }
3951
3952                 $unixts = wfTimestamp( TS_UNIX, $ts );
3953                 $oldtz = date_default_timezone_get();
3954                 date_default_timezone_set( $tz );
3955                 $ts = date( 'YmdHis', $unixts );
3956                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
3957
3958                 /* Allow translation of timezones trough wiki. date() can return
3959                  * whatever crap the system uses, localised or not, so we cannot
3960                  * ship premade translations.
3961                  */
3962                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
3963                 $value = wfMsgForContent( $key );
3964                 if ( !wfEmptyMsg( $key, $value ) ) $tzMsg = $value;
3965
3966                 date_default_timezone_set( $oldtz );
3967
3968                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
3969
3970                 # Variable replacement
3971                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3972                 $text = $this->replaceVariables( $text );
3973
3974                 # Signatures
3975                 $sigText = $this->getUserSig( $user );
3976                 $text = strtr( $text, array(
3977                         '~~~~~' => $d,
3978                         '~~~~' => "$sigText $d",
3979                         '~~~' => $sigText
3980                 ) );
3981
3982                 # Context links: [[|name]] and [[name (context)|]]
3983                 #
3984                 global $wgLegalTitleChars;
3985                 $tc = "[$wgLegalTitleChars]";
3986                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3987
3988                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3989                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
3990                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3991                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3992
3993                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3994                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3995                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
3996                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3997
3998                 $t = $this->mTitle->getText();
3999                 $m = array();
4000                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4001                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4002                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4003                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4004                 } else {
4005                         # if there's no context, don't bother duplicating the title
4006                         $text = preg_replace( $p2, '[[\\1]]', $text );
4007                 }
4008
4009                 # Trim trailing whitespace
4010                 $text = rtrim( $text );
4011
4012                 return $text;
4013         }
4014
4015         /**
4016          * Fetch the user's signature text, if any, and normalize to
4017          * validated, ready-to-insert wikitext.
4018          * If you have pre-fetched the nickname or the fancySig option, you can
4019          * specify them here to save a database query.
4020          *
4021          * @param User $user
4022          * @return string
4023          */
4024         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4025                 global $wgMaxSigChars;
4026
4027                 $username = $user->getName();
4028
4029                 // If not given, retrieve from the user object.
4030                 if ( $nickname === false )
4031                         $nickname = $user->getOption( 'nickname' );
4032
4033                 if ( is_null( $fancySig ) )
4034                         $fancySig = $user->getBoolOption( 'fancysig' );
4035
4036                 $nickname = $nickname == null ? $username : $nickname;
4037
4038                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4039                         $nickname = $username;
4040                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4041                 } elseif( $fancySig !== false ) {
4042                         # Sig. might contain markup; validate this
4043                         if( $this->validateSig( $nickname ) !== false ) {
4044                                 # Validated; clean up (if needed) and return it
4045                                 return $this->cleanSig( $nickname, true );
4046                         } else {
4047                                 # Failed to validate; fall back to the default
4048                                 $nickname = $username;
4049                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4050                         }
4051                 }
4052
4053                 // Make sure nickname doesnt get a sig in a sig
4054                 $nickname = $this->cleanSigInSig( $nickname );
4055
4056                 # If we're still here, make it a link to the user page
4057                 $userText = wfEscapeWikiText( $username );
4058                 $nickText = wfEscapeWikiText( $nickname );
4059                 if ( $user->isAnon() )  {
4060                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4061                 } else {
4062                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4063                 }
4064         }
4065
4066         /**
4067          * Check that the user's signature contains no bad XML
4068          *
4069          * @param string $text
4070          * @return mixed An expanded string, or false if invalid.
4071          */
4072         function validateSig( $text ) {
4073                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4074         }
4075
4076         /**
4077          * Clean up signature text
4078          *
4079          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4080          * 2) Substitute all transclusions
4081          *
4082          * @param string $text
4083          * @param $parsing Whether we're cleaning (preferences save) or parsing
4084          * @return string Signature text
4085          */
4086         function cleanSig( $text, $parsing = false ) {
4087                 if ( !$parsing ) {
4088                         global $wgTitle;
4089                         $this->clearState();
4090                         $this->setTitle( $wgTitle );
4091                         $this->mOptions = new ParserOptions;
4092                         $this->setOutputType = self::OT_PREPROCESS;
4093                 }
4094
4095                 # Option to disable this feature
4096                 if ( !$this->mOptions->getCleanSignatures() ) {
4097                         return $text;
4098                 }
4099
4100                 # FIXME: regex doesn't respect extension tags or nowiki
4101                 #  => Move this logic to braceSubstitution()
4102                 $substWord = MagicWord::get( 'subst' );
4103                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4104                 $substText = '{{' . $substWord->getSynonym( 0 );
4105
4106                 $text = preg_replace( $substRegex, $substText, $text );
4107                 $text = $this->cleanSigInSig( $text );
4108                 $dom = $this->preprocessToDom( $text );
4109                 $frame = $this->getPreprocessor()->newFrame();
4110                 $text = $frame->expand( $dom );
4111
4112                 if ( !$parsing ) {
4113                         $text = $this->mStripState->unstripBoth( $text );
4114                 }
4115
4116                 return $text;
4117         }
4118
4119         /**
4120          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4121          * @param string $text
4122          * @return string Signature text with /~{3,5}/ removed
4123          */
4124         function cleanSigInSig( $text ) {
4125                 $text = preg_replace( '/~{3,5}/', '', $text );
4126                 return $text;
4127         }
4128
4129         /**
4130          * Set up some variables which are usually set up in parse()
4131          * so that an external function can call some class members with confidence
4132          * @public
4133          */
4134         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4135                 $this->setTitle( $title );
4136                 $this->mOptions = $options;
4137                 $this->setOutputType( $outputType );
4138                 if ( $clearState ) {
4139                         $this->clearState();
4140                 }
4141         }
4142
4143         /**
4144          * Wrapper for preprocess()
4145          *
4146          * @param string $text the text to preprocess
4147          * @param ParserOptions $options  options
4148          * @return string
4149          * @public
4150          */
4151         function transformMsg( $text, $options ) {
4152                 global $wgTitle;
4153                 static $executing = false;
4154
4155                 # Guard against infinite recursion
4156                 if ( $executing ) {
4157                         return $text;
4158                 }
4159                 $executing = true;
4160
4161                 wfProfileIn(__METHOD__);
4162                 $text = $this->preprocess( $text, $wgTitle, $options );
4163
4164                 $executing = false;
4165                 wfProfileOut(__METHOD__);
4166                 return $text;
4167         }
4168
4169         /**
4170          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4171          * The callback should have the following form:
4172          *    function myParserHook( $text, $params, &$parser ) { ... }
4173          *
4174          * Transform and return $text. Use $parser for any required context, e.g. use
4175          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4176          *
4177          * @public
4178          *
4179          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4180          * @param mixed $callback The callback function (and object) to use for the tag
4181          *
4182          * @return The old value of the mTagHooks array associated with the hook
4183          */
4184         function setHook( $tag, $callback ) {
4185                 $tag = strtolower( $tag );
4186                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4187                 $this->mTagHooks[$tag] = $callback;
4188                 if( !in_array( $tag, $this->mStripList ) ) {
4189                         $this->mStripList[] = $tag;
4190                 }
4191
4192                 return $oldVal;
4193         }
4194
4195         function setTransparentTagHook( $tag, $callback ) {
4196                 $tag = strtolower( $tag );
4197                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4198                 $this->mTransparentTagHooks[$tag] = $callback;
4199
4200                 return $oldVal;
4201         }
4202
4203         /**
4204          * Remove all tag hooks
4205          */
4206         function clearTagHooks() {
4207                 $this->mTagHooks = array();
4208                 $this->mStripList = $this->mDefaultStripList;
4209         }
4210
4211         /**
4212          * Create a function, e.g. {{sum:1|2|3}}
4213          * The callback function should have the form:
4214          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4215          *
4216          * Or with SFH_OBJECT_ARGS:
4217          *    function myParserFunction( $parser, $frame, $args ) { ... }
4218          *
4219          * The callback may either return the text result of the function, or an array with the text
4220          * in element 0, and a number of flags in the other elements. The names of the flags are
4221          * specified in the keys. Valid flags are:
4222          *   found                     The text returned is valid, stop processing the template. This
4223          *                             is on by default.
4224          *   nowiki                    Wiki markup in the return value should be escaped
4225          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4226          *
4227          * @public
4228          *
4229          * @param string $id The magic word ID
4230          * @param mixed $callback The callback function (and object) to use
4231          * @param integer $flags a combination of the following flags:
4232          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4233          *
4234          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4235          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4236          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4237          *     the arguments, and to control the way they are expanded.
4238          *
4239          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4240          *     arguments, for instance:
4241          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4242          *
4243          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4244          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4245          *     working if/when this is changed.
4246          *
4247          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4248          *     expansion.
4249          *
4250          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4251          *     about the methods available in PPFrame and PPNode.
4252          *
4253          * @return The old callback function for this name, if any
4254          */
4255         function setFunctionHook( $id, $callback, $flags = 0 ) {
4256                 global $wgContLang;
4257
4258                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4259                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4260
4261                 # Add to function cache
4262                 $mw = MagicWord::get( $id );
4263                 if( !$mw )
4264                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4265
4266                 $synonyms = $mw->getSynonyms();
4267                 $sensitive = intval( $mw->isCaseSensitive() );
4268
4269                 foreach ( $synonyms as $syn ) {
4270                         # Case
4271                         if ( !$sensitive ) {
4272                                 $syn = $wgContLang->lc( $syn );
4273                         }
4274                         # Add leading hash
4275                         if ( !( $flags & SFH_NO_HASH ) ) {
4276                                 $syn = '#' . $syn;
4277                         }
4278                         # Remove trailing colon
4279                         if ( substr( $syn, -1, 1 ) === ':' ) {
4280                                 $syn = substr( $syn, 0, -1 );
4281                         }
4282                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4283                 }
4284                 return $oldVal;
4285         }
4286
4287         /**
4288          * Get all registered function hook identifiers
4289          *
4290          * @return array
4291          */
4292         function getFunctionHooks() {
4293                 return array_keys( $this->mFunctionHooks );
4294         }
4295
4296         /**
4297          * Create a tag function, e.g. <test>some stuff</test>.
4298          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4299          * Unlike parser functions, their content is not preprocessed.
4300          */
4301         function setFunctionTagHook( $tag, $callback, $flags ) {
4302                 $tag = strtolower( $tag );
4303                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4304                         $this->mFunctionTagHooks[$tag] : null;
4305                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4306
4307                 if( !in_array( $tag, $this->mStripList ) ) {
4308                         $this->mStripList[] = $tag;
4309                 }
4310
4311                 return $old;
4312         }
4313
4314         /**
4315          * FIXME: update documentation. makeLinkObj() is deprecated.
4316          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4317          * Placeholders created in Skin::makeLinkObj()
4318          * Returns an array of link CSS classes, indexed by PDBK.
4319          */
4320         function replaceLinkHolders( &$text, $options = 0 ) {
4321                 return $this->mLinkHolders->replace( $text );
4322         }
4323
4324         /**
4325          * Replace <!--LINK--> link placeholders with plain text of links
4326          * (not HTML-formatted).
4327          * @param string $text
4328          * @return string
4329          */
4330         function replaceLinkHoldersText( $text ) {
4331                 return $this->mLinkHolders->replaceText( $text );
4332         }
4333
4334         /**
4335          * Renders an image gallery from a text with one line per image.
4336          * text labels may be given by using |-style alternative text. E.g.
4337          *   Image:one.jpg|The number "1"
4338          *   Image:tree.jpg|A tree
4339          * given as text will return the HTML of a gallery with two images,
4340          * labeled 'The number "1"' and
4341          * 'A tree'.
4342          */
4343         function renderImageGallery( $text, $params ) {
4344                 $ig = new ImageGallery();
4345                 $ig->setContextTitle( $this->mTitle );
4346                 $ig->setShowBytes( false );
4347                 $ig->setShowFilename( false );
4348                 $ig->setParser( $this );
4349                 $ig->setHideBadImages();
4350                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4351                 $ig->useSkin( $this->mOptions->getSkin() );
4352                 $ig->mRevisionId = $this->mRevisionId;
4353
4354                 if( isset( $params['caption'] ) ) {
4355                         $caption = $params['caption'];
4356                         $caption = htmlspecialchars( $caption );
4357                         $caption = $this->replaceInternalLinks( $caption );
4358                         $ig->setCaptionHtml( $caption );
4359                 }
4360                 if( isset( $params['perrow'] ) ) {
4361                         $ig->setPerRow( $params['perrow'] );
4362                 }
4363                 if( isset( $params['widths'] ) ) {
4364                         $ig->setWidths( $params['widths'] );
4365                 }
4366                 if( isset( $params['heights'] ) ) {
4367                         $ig->setHeights( $params['heights'] );
4368                 }
4369
4370                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4371
4372                 $lines = StringUtils::explode( "\n", $text );
4373                 foreach ( $lines as $line ) {
4374                         # match lines like these:
4375                         # Image:someimage.jpg|This is some image
4376                         $matches = array();
4377                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4378                         # Skip empty lines
4379                         if ( count( $matches ) == 0 ) {
4380                                 continue;
4381                         }
4382
4383                         if ( strpos( $matches[0], '%' ) !== false )
4384                                 $matches[1] = urldecode( $matches[1] );
4385                         $tp = Title::newFromText( $matches[1]/*, NS_FILE*/ );
4386                         $nt =& $tp;
4387                         if( is_null( $nt ) ) {
4388                                 # Bogus title. Ignore these so we don't bomb out later.
4389                                 continue;
4390                         }
4391                         if ( isset( $matches[3] ) ) {
4392                                 $label = $matches[3];
4393                         } else {
4394                                 $label = '';
4395                         }
4396
4397                         $html = $this->recursiveTagParse( trim( $label ) );
4398
4399                         $ig->add( $nt, $html );
4400
4401                         # Only add real images (bug #5586)
4402                         if ( $nt->getNamespace() == NS_FILE ) {
4403                                 $this->mOutput->addImage( $nt->getDBkey() );
4404                         }
4405                 }
4406                 return $ig->toHTML();
4407         }
4408
4409         function getImageParams( $handler ) {
4410                 if ( $handler ) {
4411                         $handlerClass = get_class( $handler );
4412                 } else {
4413                         $handlerClass = '';
4414                 }
4415                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4416                         // Initialise static lists
4417                         static $internalParamNames = array(
4418                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4419                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4420                                         'bottom', 'text-bottom' ),
4421                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4422                                         'upright', 'border', 'link', 'alt' ),
4423                         );
4424                         static $internalParamMap;
4425                         if ( !$internalParamMap ) {
4426                                 $internalParamMap = array();
4427                                 foreach ( $internalParamNames as $type => $names ) {
4428                                         foreach ( $names as $name ) {
4429                                                 $magicName = str_replace( '-', '_', "img_$name" );
4430                                                 $internalParamMap[$magicName] = array( $type, $name );
4431                                         }
4432                                 }
4433                         }
4434
4435                         // Add handler params
4436                         $paramMap = $internalParamMap;
4437                         if ( $handler ) {
4438                                 $handlerParamMap = $handler->getParamMap();
4439                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4440                                         $paramMap[$magic] = array( 'handler', $paramName );
4441                                 }
4442                         }
4443                         $this->mImageParams[$handlerClass] = $paramMap;
4444                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4445                 }
4446                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4447         }
4448
4449         /**
4450          * Parse image options text and use it to make an image
4451          * @param Title $title
4452          * @param string $options
4453          * @param LinkHolderArray $holders
4454          */
4455         function makeImage( $title, $options, $holders = false ) {
4456                 # Check if the options text is of the form "options|alt text"
4457                 # Options are:
4458                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4459                 #  * left       no resizing, just left align. label is used for alt= only
4460                 #  * right      same, but right aligned
4461                 #  * none       same, but not aligned
4462                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4463                 #  * center     center the image
4464                 #  * frame      Keep original image size, no magnify-button.
4465                 #  * framed     Same as "frame"
4466                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4467                 #  * upright    reduce width for upright images, rounded to full __0 px
4468                 #  * border     draw a 1px border around the image
4469                 #  * alt        Text for HTML alt attribute (defaults to empty)
4470                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4471                 # vertical-align values (no % or length right now):
4472                 #  * baseline
4473                 #  * sub
4474                 #  * super
4475                 #  * top
4476                 #  * text-top
4477                 #  * middle
4478                 #  * bottom
4479                 #  * text-bottom
4480
4481                 $parts = StringUtils::explode( "|", $options );
4482                 $sk = $this->mOptions->getSkin();
4483
4484                 # Give extensions a chance to select the file revision for us
4485                 $skip = $time = $descQuery = false;
4486                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4487
4488                 if ( $skip ) {
4489                         return $sk->link( $title );
4490                 }
4491
4492                 # Get the file
4493                 $imagename = $title->getDBkey();
4494                 $file = wfFindFile( $title, array( 'time' => $time ) );
4495                 # Get parameter map
4496                 $handler = $file ? $file->getHandler() : false;
4497
4498                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4499
4500                 # Process the input parameters
4501                 $caption = '';
4502                 $params = array( 'frame' => array(), 'handler' => array(),
4503                         'horizAlign' => array(), 'vertAlign' => array() );
4504                 foreach( $parts as $part ) {
4505                         $part = trim( $part );
4506                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4507                         $validated = false;
4508                         if( isset( $paramMap[$magicName] ) ) {
4509                                 list( $type, $paramName ) = $paramMap[$magicName];
4510
4511                                 // Special case; width and height come in one variable together
4512                                 if( $type === 'handler' && $paramName === 'width' ) {
4513                                         $m = array();
4514                                         # (bug 13500) In both cases (width/height and width only),
4515                                         # permit trailing "px" for backward compatibility.
4516                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4517                                                 $width = intval( $m[1] );
4518                                                 $height = intval( $m[2] );
4519                                                 if ( $handler->validateParam( 'width', $width ) ) {
4520                                                         $params[$type]['width'] = $width;
4521                                                         $validated = true;
4522                                                 }
4523                                                 if ( $handler->validateParam( 'height', $height ) ) {
4524                                                         $params[$type]['height'] = $height;
4525                                                         $validated = true;
4526                                                 }
4527                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4528                                                 $width = intval( $value );
4529                                                 if ( $handler->validateParam( 'width', $width ) ) {
4530                                                         $params[$type]['width'] = $width;
4531                                                         $validated = true;
4532                                                 }
4533                                         } // else no validation -- bug 13436
4534                                 } else {
4535                                         if ( $type === 'handler' ) {
4536                                                 # Validate handler parameter
4537                                                 $validated = $handler->validateParam( $paramName, $value );
4538                                         } else {
4539                                                 # Validate internal parameters
4540                                                 switch( $paramName ) {
4541                                                 case 'manualthumb':
4542                                                 case 'alt':
4543                                                         // @todo Fixme: possibly check validity here for
4544                                                         // manualthumb? downstream behavior seems odd with
4545                                                         // missing manual thumbs.
4546                                                         $validated = true;
4547                                                         $value = $this->stripAltText( $value, $holders );
4548                                                         break;
4549                                                 case 'link':
4550                                                         $chars = self::EXT_LINK_URL_CLASS;
4551                                                         $prots = $this->mUrlProtocols;
4552                                                         if ( $value === '' ) {
4553                                                                 $paramName = 'no-link';
4554                                                                 $value = true;
4555                                                                 $validated = true;
4556                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4557                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4558                                                                         $paramName = 'link-url';
4559                                                                         $this->mOutput->addExternalLink( $value );
4560                                                                         $validated = true;
4561                                                                 }
4562                                                         } else {
4563                                                                 $linkTitle = Title::newFromText( $value );
4564                                                                 if ( $linkTitle ) {
4565                                                                         $paramName = 'link-title';
4566                                                                         $value = $linkTitle;
4567                                                                         $this->mOutput->addLink( $linkTitle );
4568                                                                         $validated = true;
4569                                                                 }
4570                                                         }
4571                                                         break;
4572                                                 default:
4573                                                         // Most other things appear to be empty or numeric...
4574                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4575                                                 }
4576                                         }
4577
4578                                         if ( $validated ) {
4579                                                 $params[$type][$paramName] = $value;
4580                                         }
4581                                 }
4582                         }
4583                         if ( !$validated ) {
4584                                 $caption = $part;
4585                         }
4586                 }
4587
4588                 # Process alignment parameters
4589                 if ( $params['horizAlign'] ) {
4590                         $params['frame']['align'] = key( $params['horizAlign'] );
4591                 }
4592                 if ( $params['vertAlign'] ) {
4593                         $params['frame']['valign'] = key( $params['vertAlign'] );
4594                 }
4595
4596                 $params['frame']['caption'] = $caption;
4597
4598                 # Will the image be presented in a frame, with the caption below?
4599                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4600                                  isset( $params['frame']['framed'] ) ||
4601                                  isset( $params['frame']['thumbnail'] ) ||
4602                                  isset( $params['frame']['manualthumb'] );
4603
4604                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4605                 # came to also set the caption, ordinary text after the image -- which
4606                 # makes no sense, because that just repeats the text multiple times in
4607                 # screen readers.  It *also* came to set the title attribute.
4608                 #
4609                 # Now that we have an alt attribute, we should not set the alt text to
4610                 # equal the caption: that's worse than useless, it just repeats the
4611                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4612                 # use the unnamed parameter for alt text as well, just for the time be-
4613                 # ing, if the unnamed param is set and the alt param is not.
4614                 #
4615                 # For the future, we need to figure out if we want to tweak this more,
4616                 # e.g., introducing a title= parameter for the title; ignoring the un-
4617                 # named parameter entirely for images without a caption; adding an ex-
4618                 # plicit caption= parameter and preserving the old magic unnamed para-
4619                 # meter for BC; ...
4620                 if ( $imageIsFramed ) { # Framed image
4621                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4622                                 # No caption or alt text, add the filename as the alt text so
4623                                 # that screen readers at least get some description of the image
4624                                 $params['frame']['alt'] = $title->getText();
4625                         }
4626                         # Do not set $params['frame']['title'] because tooltips don't make sense
4627                         # for framed images
4628                 } else { # Inline image
4629                         if ( !isset( $params['frame']['alt'] ) ) {
4630                                 # No alt text, use the "caption" for the alt text
4631                                 if ( $caption !== '') {
4632                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4633                                 } else {
4634                                         # No caption, fall back to using the filename for the
4635                                         # alt text
4636                                         $params['frame']['alt'] = $title->getText();
4637                                 }
4638                         }
4639                         # Use the "caption" for the tooltip text
4640                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4641                 }
4642
4643                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4644
4645                 # Linker does the rest
4646                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4647
4648                 # Give the handler a chance to modify the parser object
4649                 if ( $handler ) {
4650                         $handler->parserTransformHook( $this, $file );
4651                 }
4652
4653                 return $ret;
4654         }
4655
4656         protected function stripAltText( $caption, $holders ) {
4657                 # Strip bad stuff out of the title (tooltip).  We can't just use
4658                 # replaceLinkHoldersText() here, because if this function is called
4659                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4660                 if ( $holders ) {
4661                         $tooltip = $holders->replaceText( $caption );
4662                 } else {
4663                         $tooltip = $this->replaceLinkHoldersText( $caption );
4664                 }
4665
4666                 # make sure there are no placeholders in thumbnail attributes
4667                 # that are later expanded to html- so expand them now and
4668                 # remove the tags
4669                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4670                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4671
4672                 return $tooltip;
4673         }
4674
4675         /**
4676          * Set a flag in the output object indicating that the content is dynamic and
4677          * shouldn't be cached.
4678          */
4679         function disableCache() {
4680                 wfDebug( "Parser output marked as uncacheable.\n" );
4681                 $this->mOutput->mCacheTime = -1;
4682         }
4683
4684         /**#@+
4685          * Callback from the Sanitizer for expanding items found in HTML attribute
4686          * values, so they can be safely tested and escaped.
4687          * @param string $text
4688          * @param PPFrame $frame
4689          * @return string
4690          * @private
4691          */
4692         function attributeStripCallback( &$text, $frame = false ) {
4693                 $text = $this->replaceVariables( $text, $frame );
4694                 $text = $this->mStripState->unstripBoth( $text );
4695                 return $text;
4696         }
4697
4698         /**#@-*/
4699
4700         /**#@+
4701          * Accessor/mutator
4702          */
4703         function Title( $x = null ) { return wfSetVar( $this->mTitle, $x ); }
4704         function Options( $x = null ) { return wfSetVar( $this->mOptions, $x ); }
4705         function OutputType( $x = null ) { return wfSetVar( $this->mOutputType, $x ); }
4706         /**#@-*/
4707
4708         /**#@+
4709          * Accessor
4710          */
4711         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4712         /**#@-*/
4713
4714
4715         /**
4716          * Break wikitext input into sections, and either pull or replace
4717          * some particular section's text.
4718          *
4719          * External callers should use the getSection and replaceSection methods.
4720          *
4721          * @param string $text Page wikitext
4722          * @param string $section A section identifier string of the form:
4723          *   <flag1> - <flag2> - ... - <section number>
4724          *
4725          * Currently the only recognised flag is "T", which means the target section number
4726          * was derived during a template inclusion parse, in other words this is a template
4727          * section edit link. If no flags are given, it was an ordinary section edit link.
4728          * This flag is required to avoid a section numbering mismatch when a section is
4729          * enclosed by <includeonly> (bug 6563).
4730          *
4731          * The section number 0 pulls the text before the first heading; other numbers will
4732          * pull the given section along with its lower-level subsections. If the section is
4733          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4734          *
4735          * @param string $mode One of "get" or "replace"
4736          * @param string $newText Replacement text for section data.
4737          * @return string for "get", the extracted section text.
4738          *                for "replace", the whole page with the section replaced.
4739          */
4740         private function extractSections( $text, $section, $mode, $newText='' ) {
4741                 global $wgTitle;
4742                 $this->clearState();
4743                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4744                 $this->mOptions = new ParserOptions;
4745                 $this->setOutputType( self::OT_WIKI );
4746                 $outText = '';
4747                 $frame = $this->getPreprocessor()->newFrame();
4748
4749                 // Process section extraction flags
4750                 $flags = 0;
4751                 $sectionParts = explode( '-', $section );
4752                 $sectionIndex = array_pop( $sectionParts );
4753                 foreach ( $sectionParts as $part ) {
4754                         if ( $part === 'T' ) {
4755                                 $flags |= self::PTD_FOR_INCLUSION;
4756                         }
4757                 }
4758                 // Preprocess the text
4759                 $root = $this->preprocessToDom( $text, $flags );
4760
4761                 // <h> nodes indicate section breaks
4762                 // They can only occur at the top level, so we can find them by iterating the root's children
4763                 $node = $root->getFirstChild();
4764
4765                 // Find the target section
4766                 if ( $sectionIndex == 0 ) {
4767                         // Section zero doesn't nest, level=big
4768                         $targetLevel = 1000;
4769                 } else {
4770             while ( $node ) {
4771                 if ( $node->getName() === 'h' ) {
4772                     $bits = $node->splitHeading();
4773                                         if ( $bits['i'] == $sectionIndex ) {
4774                                         $targetLevel = $bits['level'];
4775                                                 break;
4776                                         }
4777                                 }
4778                                 if ( $mode === 'replace' ) {
4779                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4780                                 }
4781                                 $node = $node->getNextSibling();
4782                         }
4783                 }
4784
4785                 if ( !$node ) {
4786                         // Not found
4787                         if ( $mode === 'get' ) {
4788                                 return $newText;
4789                         } else {
4790                                 return $text;
4791                         }
4792                 }
4793
4794                 // Find the end of the section, including nested sections
4795                 do {
4796                         if ( $node->getName() === 'h' ) {
4797                                 $bits = $node->splitHeading();
4798                                 $curLevel = $bits['level'];
4799                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4800                                         break;
4801                                 }
4802                         }
4803                         if ( $mode === 'get' ) {
4804                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4805                         }
4806                         $node = $node->getNextSibling();
4807                 } while ( $node );
4808
4809                 // Write out the remainder (in replace mode only)
4810                 if ( $mode === 'replace' ) {
4811                         // Output the replacement text
4812                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4813                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4814                         // Only add trailing whitespace if there is newText
4815                         if($newText != "") {
4816                                 $outText .= $newText . "\n\n";
4817                         }
4818
4819                         while ( $node ) {
4820                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4821                                 $node = $node->getNextSibling();
4822                         }
4823                 }
4824
4825                 if ( is_string( $outText ) ) {
4826                         // Re-insert stripped tags
4827                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4828                 }
4829
4830                 return $outText;
4831         }
4832
4833         /**
4834          * This function returns the text of a section, specified by a number ($section).
4835          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4836          * the first section before any such heading (section 0).
4837          *
4838          * If a section contains subsections, these are also returned.
4839          *
4840          * @param string $text text to look in
4841          * @param string $section section identifier
4842          * @param string $deftext default to return if section is not found
4843          * @return string text of the requested section
4844          */
4845         public function getSection( $text, $section, $deftext='' ) {
4846                 return $this->extractSections( $text, $section, "get", $deftext );
4847         }
4848
4849         public function replaceSection( $oldtext, $section, $text ) {
4850                 return $this->extractSections( $oldtext, $section, "replace", $text );
4851         }
4852
4853         /**
4854          * Get the timestamp associated with the current revision, adjusted for
4855          * the default server-local timestamp
4856          */
4857         function getRevisionTimestamp() {
4858                 if ( is_null( $this->mRevisionTimestamp ) ) {
4859                         wfProfileIn( __METHOD__ );
4860                         global $wgContLang;
4861                         $dbr = wfGetDB( DB_SLAVE );
4862                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4863                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4864
4865                         // Normalize timestamp to internal MW format for timezone processing.
4866                         // This has the added side-effect of replacing a null value with
4867                         // the current time, which gives us more sensible behavior for
4868                         // previews.
4869                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4870
4871                         // The cryptic '' timezone parameter tells to use the site-default
4872                         // timezone offset instead of the user settings.
4873                         //
4874                         // Since this value will be saved into the parser cache, served
4875                         // to other users, and potentially even used inside links and such,
4876                         // it needs to be consistent for all visitors.
4877                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4878
4879                         wfProfileOut( __METHOD__ );
4880                 }
4881                 return $this->mRevisionTimestamp;
4882         }
4883
4884         /**
4885          * Get the name of the user that edited the last revision
4886          */
4887         function getRevisionUser() {
4888                 // if this template is subst: the revision id will be blank,
4889                 // so just use the current user's name
4890                 if( $this->mRevisionId ) {
4891                         $revision = Revision::newFromId( $this->mRevisionId );
4892                         $revuser = $revision->getUserText();
4893                 } else {
4894                         global $wgUser;
4895                         $revuser = $wgUser->getName();
4896                 }
4897                 return $revuser;
4898         }
4899
4900         /**
4901          * Mutator for $mDefaultSort
4902          *
4903          * @param $sort New value
4904          */
4905         public function setDefaultSort( $sort ) {
4906                 $this->mDefaultSort = $sort;
4907         }
4908
4909         /**
4910          * Accessor for $mDefaultSort
4911          * Will use the title/prefixed title if none is set
4912          *
4913          * @return string
4914          */
4915         public function getDefaultSort() {
4916                 global $wgCategoryPrefixedDefaultSortkey;
4917                 if( $this->mDefaultSort !== false ) {
4918                         return $this->mDefaultSort;
4919                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4920                         !$wgCategoryPrefixedDefaultSortkey) {
4921                         return $this->mTitle->getText();
4922                 } else {
4923                         return $this->mTitle->getPrefixedText();
4924                 }
4925         }
4926
4927         /**
4928          * Accessor for $mDefaultSort
4929          * Unlike getDefaultSort(), will return false if none is set
4930          *
4931          * @return string or false
4932          */
4933         public function getCustomDefaultSort() {
4934                 return $this->mDefaultSort;
4935         }
4936
4937         /**
4938          * Try to guess the section anchor name based on a wikitext fragment
4939          * presumably extracted from a heading, for example "Header" from
4940          * "== Header ==".
4941          */
4942         public function guessSectionNameFromWikiText( $text ) {
4943                 # Strip out wikitext links(they break the anchor)
4944                 $text = $this->stripSectionName( $text );
4945                 $headline = Sanitizer::decodeCharReferences( $text );
4946                 # strip out HTML
4947                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4948                 $headline = trim( $headline );
4949                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4950                 $replacearray = array(
4951                         '%3A' => ':',
4952                         '%' => '.'
4953                 );
4954                 return str_replace(
4955                         array_keys( $replacearray ),
4956                         array_values( $replacearray ),
4957                         $sectionanchor );
4958         }
4959
4960         /**
4961          * Strips a text string of wikitext for use in a section anchor
4962          *
4963          * Accepts a text string and then removes all wikitext from the
4964          * string and leaves only the resultant text (i.e. the result of
4965          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4966          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4967          * to create valid section anchors by mimicing the output of the
4968          * parser when headings are parsed.
4969          *
4970          * @param $text string Text string to be stripped of wikitext
4971          * for use in a Section anchor
4972          * @return Filtered text string
4973          */
4974         public function stripSectionName( $text ) {
4975                 # Strip internal link markup
4976                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4977                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4978
4979                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4980                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4981                 # on how many empty links there are on the page - need to figure that out.
4982                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4983
4984                 # Parse wikitext quotes (italics & bold)
4985                 $text = $this->doQuotes($text);
4986
4987                 # Strip HTML tags
4988                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4989                 return $text;
4990         }
4991
4992         function srvus( $text ) {
4993                 return $this->testSrvus( $text, $this->mOutputType );
4994         }
4995
4996         /**
4997          * strip/replaceVariables/unstrip for preprocessor regression testing
4998          */
4999         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5000                 $this->clearState();
5001                 if ( ! ( $title instanceof Title ) ) {
5002                         $title = Title::newFromText( $title );
5003                 }
5004                 $this->mTitle = $title;
5005                 $this->mOptions = $options;
5006                 $this->setOutputType( $outputType );
5007                 $text = $this->replaceVariables( $text );
5008                 $text = $this->mStripState->unstripBoth( $text );
5009                 $text = Sanitizer::removeHTMLtags( $text );
5010                 return $text;
5011         }
5012
5013         function testPst( $text, $title, $options ) {
5014                 global $wgUser;
5015                 if ( ! ( $title instanceof Title ) ) {
5016                         $title = Title::newFromText( $title );
5017                 }
5018                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5019         }
5020
5021         function testPreprocess( $text, $title, $options ) {
5022                 if ( ! ( $title instanceof Title ) ) {
5023                         $title = Title::newFromText( $title );
5024                 }
5025                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5026         }
5027
5028         function markerSkipCallback( $s, $callback ) {
5029                 $i = 0;
5030                 $out = '';
5031                 while ( $i < strlen( $s ) ) {
5032                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5033                         if ( $markerStart === false ) {
5034                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5035                                 break;
5036                         } else {
5037                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5038                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5039                                 if ( $markerEnd === false ) {
5040                                         $out .= substr( $s, $markerStart );
5041                                         break;
5042                                 } else {
5043                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5044                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5045                                         $i = $markerEnd;
5046                                 }
5047                         }
5048                 }
5049                 return $out;
5050         }
5051
5052         function serialiseHalfParsedText( $text ) {
5053                 $data = array();
5054                 $data['text'] = $text;
5055
5056                 // First, find all strip markers, and store their
5057                 //  data in an array.
5058                 $stripState = new StripState;
5059                 $pos = 0;
5060                 while( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) ) && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) ) {
5061                         $end_pos += strlen( self::MARKER_SUFFIX );
5062                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5063
5064                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5065                                 $replaceArray = $stripState->general;
5066                                 $stripText = $this->mStripState->general->data[$marker];
5067                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5068                                 $replaceArray = $stripState->nowiki;
5069                                 $stripText = $this->mStripState->nowiki->data[$marker];
5070                         } else {
5071                                 throw new MWException( "Hanging strip marker: '$marker'." );
5072                         }
5073
5074                         $replaceArray->setPair( $marker, $stripText );
5075                         $pos = $end_pos;
5076                 }
5077                 $data['stripstate'] = $stripState;
5078
5079                 // Now, find all of our links, and store THEIR
5080                 //  data in an array! :)
5081                 $links = array( 'internal' => array(), 'interwiki' => array() );
5082                 $pos = 0;
5083
5084                 // Internal links
5085                 while( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5086                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5087
5088                         $ns = trim($ns);
5089                         if (empty( $links['internal'][$ns] )) {
5090                                 $links['internal'][$ns] = array();
5091                         }
5092
5093                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5094                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5095                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5096                 }
5097
5098                 $pos = 0;
5099
5100                 // Interwiki links
5101                 while( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5102                         $data = substr( $text, $start_pos );
5103                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5104                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5105                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5106                 }
5107
5108                 $data['linkholder'] = $links;
5109
5110                 return $data;
5111         }
5112
5113         function unserialiseHalfParsedText( $data, $intPrefix = null /* Unique identifying prefix */ ) {
5114                 if (!$intPrefix)
5115                         $intPrefix = $this->getRandomString();
5116
5117                 // First, extract the strip state.
5118                 $stripState = $data['stripstate'];
5119                 $this->mStripState->general->merge( $stripState->general );
5120                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5121
5122                 // Now, extract the text, and renumber links
5123                 $text = $data['text'];
5124                 $links = $data['linkholder'];
5125
5126                 // Internal...
5127                 foreach( $links['internal'] as $ns => $nsLinks ) {
5128                         foreach( $nsLinks as $key => $entry ) {
5129                                 $newKey = $intPrefix . '-' . $key;
5130                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5131
5132                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5133                         }
5134                 }
5135
5136                 // Interwiki...
5137                 foreach( $links['interwiki'] as $key => $entry ) {
5138                         $newKey = "$intPrefix-$key";
5139                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5140
5141                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5142                 }
5143
5144                 // Should be good to go.
5145                 return $text;
5146         }
5147 }
5148
5149 /**
5150  * @todo document, briefly.
5151  * @ingroup Parser
5152  */
5153 class StripState {
5154         var $general, $nowiki;
5155
5156         function __construct() {
5157                 $this->general = new ReplacementArray;
5158                 $this->nowiki = new ReplacementArray;
5159         }
5160
5161         function unstripGeneral( $text ) {
5162                 wfProfileIn( __METHOD__ );
5163                 do {
5164                         $oldText = $text;
5165                         $text = $this->general->replace( $text );
5166                 } while ( $text !== $oldText );
5167                 wfProfileOut( __METHOD__ );
5168                 return $text;
5169         }
5170
5171         function unstripNoWiki( $text ) {
5172                 wfProfileIn( __METHOD__ );
5173                 do {
5174                         $oldText = $text;
5175                         $text = $this->nowiki->replace( $text );
5176                 } while ( $text !== $oldText );
5177                 wfProfileOut( __METHOD__ );
5178                 return $text;
5179         }
5180
5181         function unstripBoth( $text ) {
5182                 wfProfileIn( __METHOD__ );
5183                 do {
5184                         $oldText = $text;
5185                         $text = $this->general->replace( $text );
5186                         $text = $this->nowiki->replace( $text );
5187                 } while ( $text !== $oldText );
5188                 wfProfileOut( __METHOD__ );
5189                 return $text;
5190         }
5191 }
5192
5193 /**
5194  * @todo document, briefly.
5195  * @ingroup Parser
5196  */
5197 class OnlyIncludeReplacer {
5198         var $output = '';
5199
5200         function replace( $matches ) {
5201                 if ( substr( $matches[1], -1 ) === "\n" ) {
5202                         $this->output .= substr( $matches[1], 0, -1 );
5203                 } else {
5204                         $this->output .= $matches[1];
5205                 }
5206         }
5207 }