includes/Parser.php

   1 <?php
   2
   3 /**
   4  *
   5  * File for Parser and related classes
   6  *
   7  * @addtogroup Parser
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * preprocess()
  24  *   removes HTML comments and expands templates
  25  * cleanSig()
  26  *   Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *   Extracts sections from an article for section editing
  29  *
  30  * Globals used:
  31  *    objects:   $wgLang, $wgContLang
  32  *
  33  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  34  *
  35  * settings:
  36  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  37  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  38  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  39  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @addtogroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  65
  66         // State constants for the definition list colon extraction
  67         const COLON_STATE_TEXT = 0;
  68         const COLON_STATE_TAG = 1;
  69         const COLON_STATE_TAGSTART = 2;
  70         const COLON_STATE_CLOSETAG = 3;
  71         const COLON_STATE_TAGSLASH = 4;
  72         const COLON_STATE_COMMENT = 5;
  73         const COLON_STATE_COMMENTDASH = 6;
  74         const COLON_STATE_COMMENTDASHDASH = 7;
  75
  76         // Flags for preprocessToDom
  77         const PTD_FOR_INCLUSION = 1;
  78
  79         // Allowed values for $this->mOutputType
  80         // Parameter to startExternalParse().
  81         const OT_HTML = 1;
  82         const OT_WIKI = 2;
  83         const OT_PREPROCESS = 3;
  84         const OT_MSG = 3;
  85
  86         /**#@+
  87          * @private
  88          */
  89         # Persistent:
  90         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  91                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerSuffix, $mMarkerIndex,
  92                 $mExtLinkBracketedRegex, $mPreprocessor, $mDefaultStripList, $mVarCache, $mConf;
  93
  94
  95         # Cleared with clearState():
  96         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  97         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  98         var $mInterwikiLinkHolders, $mLinkHolders;
  99         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 100         var $mTplExpandCache; // empty-frame expansion cache
 101         var $mTplRedirCache, $mTplDomCache, $mHeadings;
 102
 103         # Temporary
 104         # These are variables reset at least once per parse regardless of $clearState
 105         var $mOptions,      // ParserOptions object
 106                 $mTitle,        // Title context, used for self-link rendering and similar things
 107                 $mOutputType,   // Output type, one of the OT_xxx constants
 108                 $ot,            // Shortcut alias, see setOutputType()
 109                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 110                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 111                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 112
 113         /**#@-*/
 114
 115         /**
 116          * Constructor
 117          *
 118          * @public
 119          */
 120         function __construct( $conf = array() ) {
 121                 $this->mConf = $conf;
 122                 $this->mTagHooks = array();
 123                 $this->mTransparentTagHooks = array();
 124                 $this->mFunctionHooks = array();
 125                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 126                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery' );
 127                 $this->mMarkerSuffix = "-QINU\x7f";
 128                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 129                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 130                 $this->mVarCache = array();
 131                 if ( isset( $conf['preprocessorClass'] ) ) {
 132                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 133                 } else {
 134                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 135                 }
 136                 $this->mMarkerIndex = 0;
 137                 $this->mFirstCall = true;
 138         }
 139
 140         /**
 141          * Do various kinds of initialisation on the first call of the parser
 142          */
 143         function firstCallInit() {
 144                 if ( !$this->mFirstCall ) {
 145                         return;
 146                 }
 147                 $this->mFirstCall = false;
 148
 149                 wfProfileIn( __METHOD__ );
 150                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 151
 152                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 153
 154                 # Syntax for arguments (see self::setFunctionHook):
 155                 #  "name for lookup in localized magic words array",
 156                 #  function callback,
 157                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
 158                 #    instead of {{#int:...}})
 159                 $this->setFunctionHook( 'int',              array( 'CoreParserFunctions', 'intFunction'      ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'ns',               array( 'CoreParserFunctions', 'ns'               ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'urlencode',        array( 'CoreParserFunctions', 'urlencode'        ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'lcfirst',          array( 'CoreParserFunctions', 'lcfirst'          ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'ucfirst',          array( 'CoreParserFunctions', 'ucfirst'          ), SFH_NO_HASH );
 164                 $this->setFunctionHook( 'lc',               array( 'CoreParserFunctions', 'lc'               ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'uc',               array( 'CoreParserFunctions', 'uc'               ), SFH_NO_HASH );
 166                 $this->setFunctionHook( 'localurl',         array( 'CoreParserFunctions', 'localurl'         ), SFH_NO_HASH );
 167                 $this->setFunctionHook( 'localurle',        array( 'CoreParserFunctions', 'localurle'        ), SFH_NO_HASH );
 168                 $this->setFunctionHook( 'fullurl',          array( 'CoreParserFunctions', 'fullurl'          ), SFH_NO_HASH );
 169                 $this->setFunctionHook( 'fullurle',         array( 'CoreParserFunctions', 'fullurle'         ), SFH_NO_HASH );
 170                 $this->setFunctionHook( 'formatnum',        array( 'CoreParserFunctions', 'formatnum'        ), SFH_NO_HASH );
 171                 $this->setFunctionHook( 'grammar',          array( 'CoreParserFunctions', 'grammar'          ), SFH_NO_HASH );
 172                 $this->setFunctionHook( 'plural',           array( 'CoreParserFunctions', 'plural'           ), SFH_NO_HASH );
 173                 $this->setFunctionHook( 'numberofpages',    array( 'CoreParserFunctions', 'numberofpages'    ), SFH_NO_HASH );
 174                 $this->setFunctionHook( 'numberofusers',    array( 'CoreParserFunctions', 'numberofusers'    ), SFH_NO_HASH );
 175                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 176                 $this->setFunctionHook( 'numberoffiles',    array( 'CoreParserFunctions', 'numberoffiles'    ), SFH_NO_HASH );
 177                 $this->setFunctionHook( 'numberofadmins',   array( 'CoreParserFunctions', 'numberofadmins'   ), SFH_NO_HASH );
 178                 $this->setFunctionHook( 'numberofedits',    array( 'CoreParserFunctions', 'numberofedits'    ), SFH_NO_HASH );
 179                 $this->setFunctionHook( 'language',         array( 'CoreParserFunctions', 'language'         ), SFH_NO_HASH );
 180                 $this->setFunctionHook( 'padleft',          array( 'CoreParserFunctions', 'padleft'          ), SFH_NO_HASH );
 181                 $this->setFunctionHook( 'padright',         array( 'CoreParserFunctions', 'padright'         ), SFH_NO_HASH );
 182                 $this->setFunctionHook( 'anchorencode',     array( 'CoreParserFunctions', 'anchorencode'     ), SFH_NO_HASH );
 183                 $this->setFunctionHook( 'special',          array( 'CoreParserFunctions', 'special'          ) );
 184                 $this->setFunctionHook( 'defaultsort',      array( 'CoreParserFunctions', 'defaultsort'      ), SFH_NO_HASH );
 185                 $this->setFunctionHook( 'filepath',         array( 'CoreParserFunctions', 'filepath'         ), SFH_NO_HASH );
 186                 $this->setFunctionHook( 'tag',              array( 'CoreParserFunctions', 'tagObj'           ), SFH_OBJECT_ARGS );
 187
 188                 if ( $wgAllowDisplayTitle ) {
 189                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 190                 }
 191                 if ( $wgAllowSlowParserFunctions ) {
 192                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 193                 }
 194
 195                 $this->initialiseVariables();
 196
 197                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 198                 wfProfileOut( __METHOD__ );
 199         }
 200
 201         /**
 202          * Clear Parser state
 203          *
 204          * @private
 205          */
 206         function clearState() {
 207                 wfProfileIn( __METHOD__ );
 208                 if ( $this->mFirstCall ) {
 209                         $this->firstCallInit();
 210                 }
 211                 $this->mOutput = new ParserOutput;
 212                 $this->mAutonumber = 0;
 213                 $this->mLastSection = '';
 214                 $this->mDTopen = false;
 215                 $this->mIncludeCount = array();
 216                 $this->mStripState = new StripState;
 217                 $this->mArgStack = false;
 218                 $this->mInPre = false;
 219                 $this->mInterwikiLinkHolders = array(
 220                         'texts' => array(),
 221                         'titles' => array()
 222                 );
 223                 $this->mLinkHolders = array(
 224                         'namespaces' => array(),
 225                         'dbkeys' => array(),
 226                         'queries' => array(),
 227                         'texts' => array(),
 228                         'titles' => array()
 229                 );
 230                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 231
 232                 /**
 233                  * Prefix for temporary replacement strings for the multipass parser.
 234                  * \x07 should never appear in input as it's disallowed in XML.
 235                  * Using it at the front also gives us a little extra robustness
 236                  * since it shouldn't match when butted up against identifier-like
 237                  * string constructs.
 238                  *
 239                  * Must not consist of all title characters, or else it will change
 240                  * the behaviour of <nowiki> in a link.
 241                  */
 242                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 243                 # Changed to \x7f to allow XML double-parsing -- TS
 244                 $this->mUniqPrefix = "\x7fUNIQ" . Parser::getRandomString();
 245
 246
 247                 # Clear these on every parse, bug 4549
 248                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 249
 250                 $this->mShowToc = true;
 251                 $this->mForceTocPosition = false;
 252                 $this->mIncludeSizes = array(
 253                         'post-expand' => 0,
 254                         'arg' => 0,
 255                 );
 256                 $this->mPPNodeCount = 0;
 257                 $this->mDefaultSort = false;
 258                 $this->mHeadings = array();
 259
 260                 # Fix cloning
 261                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 262                         $this->mPreprocessor = null;
 263                 }
 264
 265                 wfRunHooks( 'ParserClearState', array( &$this ) );
 266                 wfProfileOut( __METHOD__ );
 267         }
 268
 269         function setOutputType( $ot ) {
 270                 $this->mOutputType = $ot;
 271                 // Shortcut alias
 272                 $this->ot = array(
 273                         'html' => $ot == self::OT_HTML,
 274                         'wiki' => $ot == self::OT_WIKI,
 275                         'pre' => $ot == self::OT_PREPROCESS,
 276                 );
 277         }
 278
 279         /**
 280          * Set the context title
 281          */
 282         function setTitle( $t ) {
 283                 if ( !$t || $t instanceof FakeTitle ) {
 284                         $t = Title::newFromText( 'NO TITLE' );
 285                 }
 286                 if ( strval( $t->getFragment() ) !== '' ) {
 287                         # Strip the fragment to avoid various odd effects
 288                         $this->mTitle = clone $t;
 289                         $this->mTitle->setFragment( '' );
 290                 } else {
 291                         $this->mTitle = $t;
 292                 }
 293         }
 294
 295         /**
 296          * Accessor for mUniqPrefix.
 297          *
 298          * @public
 299          */
 300         function uniqPrefix() {
 301                 if( !isset( $this->mUniqPrefix ) ) {
 302                         // @fixme this is probably *horribly wrong*
 303                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 304                         // if this is called for a parser cache hit, the parser may not
 305                         // have ever been initialized in the first place.
 306                         // Not really sure what the heck is supposed to be going on here.
 307                         return '';
 308                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 309                 }
 310                 return $this->mUniqPrefix;
 311         }
 312
 313         /**
 314          * Convert wikitext to HTML
 315          * Do not call this function recursively.
 316          *
 317          * @param string $text Text we want to parse
 318          * @param Title &$title A title object
 319          * @param array $options
 320          * @param boolean $linestart
 321          * @param boolean $clearState
 322          * @param int $revid number to pass in {{REVISIONID}}
 323          * @return ParserOutput a ParserOutput
 324          */
 325         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 326                 /**
 327                  * First pass--just handle <nowiki> sections, pass the rest off
 328                  * to internalParse() which does all the real work.
 329                  */
 330
 331                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 332                 $fname = 'Parser::parse-' . wfGetCaller();
 333                 wfProfileIn( __METHOD__ );
 334                 wfProfileIn( $fname );
 335
 336                 if ( $clearState ) {
 337                         $this->clearState();
 338                 }
 339
 340                 $this->mOptions = $options;
 341                 $this->setTitle( $title );
 342                 $oldRevisionId = $this->mRevisionId;
 343                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 344                 if( $revid !== null ) {
 345                         $this->mRevisionId = $revid;
 346                         $this->mRevisionTimestamp = null;
 347                 }
 348                 $this->setOutputType( self::OT_HTML );
 349                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 350                 # No more strip!
 351                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 352                 $text = $this->internalParse( $text );
 353                 $text = $this->mStripState->unstripGeneral( $text );
 354
 355                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 356                 $fixtags = array(
 357                         # french spaces, last one Guillemet-left
 358                         # only if there is something before the space
 359                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 360                         # french spaces, Guillemet-right
 361                         '/(\\302\\253) /' => '\\1&nbsp;',
 362                 );
 363                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 364
 365                 # only once and last
 366                 $text = $this->doBlockLevels( $text, $linestart );
 367
 368                 $this->replaceLinkHolders( $text );
 369
 370                 # the position of the parserConvert() call should not be changed. it
 371                 # assumes that the links are all replaced and the only thing left
 372                 # is the <nowiki> mark.
 373                 # Side-effects: this calls $this->mOutput->setTitleText()
 374                 $text = $wgContLang->parserConvert( $text, $this );
 375
 376                 $text = $this->mStripState->unstripNoWiki( $text );
 377
 378                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 379
 380 //!JF Move to its own function
 381
 382                 $uniq_prefix = $this->mUniqPrefix;
 383                 $matches = array();
 384                 $elements = array_keys( $this->mTransparentTagHooks );
 385                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 386
 387                 foreach( $matches as $marker => $data ) {
 388                         list( $element, $content, $params, $tag ) = $data;
 389                         $tagName = strtolower( $element );
 390                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 391                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 392                                         array( $content, $params, $this ) );
 393                         } else {
 394                                 $output = $tag;
 395                         }
 396                         $this->mStripState->general->setPair( $marker, $output );
 397                 }
 398                 $text = $this->mStripState->unstripGeneral( $text );
 399
 400                 $text = Sanitizer::normalizeCharReferences( $text );
 401
 402                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 403                         $text = Parser::tidy($text);
 404                 } else {
 405                         # attempt to sanitize at least some nesting problems
 406                         # (bug #2702 and quite a few others)
 407                         $tidyregs = array(
 408                                 # ''Something [http://www.cool.com cool''] -->
 409                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 410                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 411                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 412                                 # fix up an anchor inside another anchor, only
 413                                 # at least for a single single nested link (bug 3695)
 414                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 415                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 416                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 417                                 # contains a div, so fix it up here; replace
 418                                 # div with escaped text
 419                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 420                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 421                                 # remove empty italic or bold tag pairs, some
 422                                 # introduced by rules above
 423                                 '/<([bi])><\/\\1>/' => '',
 424                         );
 425
 426                         $text = preg_replace(
 427                                 array_keys( $tidyregs ),
 428                                 array_values( $tidyregs ),
 429                                 $text );
 430                 }
 431
 432                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 433
 434                 # Information on include size limits, for the benefit of users who try to skirt them
 435                 if ( $this->mOptions->getEnableLimitReport() ) {
 436                         $max = $this->mOptions->getMaxIncludeSize();
 437                         $limitReport =
 438                                 "NewPP limit report\n" .
 439                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 440                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 441                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 442                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 443                         $text .= "\n<!-- \n$limitReport-->\n";
 444                 }
 445                 $this->mOutput->setText( $text );
 446                 $this->mRevisionId = $oldRevisionId;
 447                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 448                 wfProfileOut( $fname );
 449                 wfProfileOut( __METHOD__ );
 450
 451                 return $this->mOutput;
 452         }
 453
 454         /**
 455          * Recursive parser entry point that can be called from an extension tag
 456          * hook.
 457          */
 458         function recursiveTagParse( $text ) {
 459                 wfProfileIn( __METHOD__ );
 460                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 461                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 462                 $text = $this->internalParse( $text );
 463                 wfProfileOut( __METHOD__ );
 464                 return $text;
 465         }
 466
 467         /**
 468          * Expand templates and variables in the text, producing valid, static wikitext.
 469          * Also removes comments.
 470          */
 471         function preprocess( $text, $title, $options, $revid = null ) {
 472                 wfProfileIn( __METHOD__ );
 473                 $this->clearState();
 474                 $this->setOutputType( self::OT_PREPROCESS );
 475                 $this->mOptions = $options;
 476                 $this->setTitle( $title );
 477                 if( $revid !== null ) {
 478                         $this->mRevisionId = $revid;
 479                 }
 480                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 481                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 482                 $text = $this->replaceVariables( $text );
 483                 $text = $this->mStripState->unstripBoth( $text );
 484                 wfProfileOut( __METHOD__ );
 485                 return $text;
 486         }
 487
 488         /**
 489          * Get a random string
 490          *
 491          * @private
 492          * @static
 493          */
 494         function getRandomString() {
 495                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 496         }
 497
 498         function &getTitle() { return $this->mTitle; }
 499         function getOptions() { return $this->mOptions; }
 500
 501         function getFunctionLang() {
 502                 global $wgLang, $wgContLang;
 503                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 504         }
 505
 506         /**
 507          * Get a preprocessor object
 508          */
 509         function getPreprocessor() {
 510                 if ( !isset( $this->mPreprocessor ) ) {
 511                         $class = $this->mPreprocessorClass;
 512                         $this->mPreprocessor = new $class( $this );
 513                 }
 514                 return $this->mPreprocessor;
 515         }
 516
 517         /**
 518          * Replaces all occurrences of HTML-style comments and the given tags
 519          * in the text with a random marker and returns the next text. The output
 520          * parameter $matches will be an associative array filled with data in
 521          * the form:
 522          *   'UNIQ-xxxxx' => array(
 523          *     'element',
 524          *     'tag content',
 525          *     array( 'param' => 'x' ),
 526          *     '<element param="x">tag content</element>' ) )
 527          *
 528          * @param $elements list of element names. Comments are always extracted.
 529          * @param $text Source text string.
 530          * @param $uniq_prefix
 531          *
 532          * @public
 533          * @static
 534          */
 535         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 536                 static $n = 1;
 537                 $stripped = '';
 538                 $matches = array();
 539
 540                 $taglist = implode( '|', $elements );
 541                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 542
 543                 while ( '' != $text ) {
 544                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 545                         $stripped .= $p[0];
 546                         if( count( $p ) < 5 ) {
 547                                 break;
 548                         }
 549                         if( count( $p ) > 5 ) {
 550                                 // comment
 551                                 $element    = $p[4];
 552                                 $attributes = '';
 553                                 $close      = '';
 554                                 $inside     = $p[5];
 555                         } else {
 556                                 // tag
 557                                 $element    = $p[1];
 558                                 $attributes = $p[2];
 559                                 $close      = $p[3];
 560                                 $inside     = $p[4];
 561                         }
 562
 563                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
 564                         $stripped .= $marker;
 565
 566                         if ( $close === '/>' ) {
 567                                 // Empty element tag, <tag />
 568                                 $content = null;
 569                                 $text = $inside;
 570                                 $tail = null;
 571                         } else {
 572                                 if( $element == '!--' ) {
 573                                         $end = '/(-->)/';
 574                                 } else {
 575                                         $end = "/(<\\/$element\\s*>)/i";
 576                                 }
 577                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 578                                 $content = $q[0];
 579                                 if( count( $q ) < 3 ) {
 580                                         # No end tag -- let it run out to the end of the text.
 581                                         $tail = '';
 582                                         $text = '';
 583                                 } else {
 584                                         $tail = $q[1];
 585                                         $text = $q[2];
 586                                 }
 587                         }
 588
 589                         $matches[$marker] = array( $element,
 590                                 $content,
 591                                 Sanitizer::decodeTagAttributes( $attributes ),
 592                                 "<$element$attributes$close$content$tail" );
 593                 }
 594                 return $stripped;
 595         }
 596
 597         /**
 598          * Get a list of strippable XML-like elements
 599          */
 600         function getStripList() {
 601                 global $wgRawHtml;
 602                 $elements = $this->mStripList;
 603                 if( $wgRawHtml ) {
 604                         $elements[] = 'html';
 605                 }
 606                 if( $this->mOptions->getUseTeX() ) {
 607                         $elements[] = 'math';
 608                 }
 609                 return $elements;
 610         }
 611
 612         /**
 613          * @deprecated use replaceVariables
 614          */
 615         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 616                 return $text;
 617         }
 618
 619         /**
 620          * Restores pre, math, and other extensions removed by strip()
 621          *
 622          * always call unstripNoWiki() after this one
 623          * @private
 624          * @deprecated use $this->mStripState->unstrip()
 625          */
 626         function unstrip( $text, $state ) {
 627                 return $state->unstripGeneral( $text );
 628         }
 629
 630         /**
 631          * Always call this after unstrip() to preserve the order
 632          *
 633          * @private
 634          * @deprecated use $this->mStripState->unstrip()
 635          */
 636         function unstripNoWiki( $text, $state ) {
 637                 return $state->unstripNoWiki( $text );
 638         }
 639
 640         /**
 641          * @deprecated use $this->mStripState->unstripBoth()
 642          */
 643         function unstripForHTML( $text ) {
 644                 return $this->mStripState->unstripBoth( $text );
 645         }
 646
 647         /**
 648          * Add an item to the strip state
 649          * Returns the unique tag which must be inserted into the stripped text
 650          * The tag will be replaced with the original text in unstrip()
 651          *
 652          * @private
 653          */
 654         function insertStripItem( $text ) {
 655                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-{$this->mMarkerSuffix}";
 656                 $this->mMarkerIndex++;
 657                 $this->mStripState->general->setPair( $rnd, $text );
 658                 return $rnd;
 659         }
 660
 661         /**
 662          * Interface with html tidy, used if $wgUseTidy = true.
 663          * If tidy isn't able to correct the markup, the original will be
 664          * returned in all its glory with a warning comment appended.
 665          *
 666          * Either the external tidy program or the in-process tidy extension
 667          * will be used depending on availability. Override the default
 668          * $wgTidyInternal setting to disable the internal if it's not working.
 669          *
 670          * @param string $text Hideous HTML input
 671          * @return string Corrected HTML output
 672          * @public
 673          * @static
 674          */
 675         function tidy( $text ) {
 676                 global $wgTidyInternal;
 677                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 678 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 679 '<head><title>test</title></head><body>'.$text.'</body></html>';
 680                 if( $wgTidyInternal ) {
 681                         $correctedtext = Parser::internalTidy( $wrappedtext );
 682                 } else {
 683                         $correctedtext = Parser::externalTidy( $wrappedtext );
 684                 }
 685                 if( is_null( $correctedtext ) ) {
 686                         wfDebug( "Tidy error detected!\n" );
 687                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 688                 }
 689                 return $correctedtext;
 690         }
 691
 692         /**
 693          * Spawn an external HTML tidy process and get corrected markup back from it.
 694          *
 695          * @private
 696          * @static
 697          */
 698         function externalTidy( $text ) {
 699                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 700                 $fname = 'Parser::externalTidy';
 701                 wfProfileIn( $fname );
 702
 703                 $cleansource = '';
 704                 $opts = ' -utf8';
 705
 706                 $descriptorspec = array(
 707                         0 => array('pipe', 'r'),
 708                         1 => array('pipe', 'w'),
 709                         2 => array('file', wfGetNull(), 'a')
 710                 );
 711                 $pipes = array();
 712                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 713                 if (is_resource($process)) {
 714                         // Theoretically, this style of communication could cause a deadlock
 715                         // here. If the stdout buffer fills up, then writes to stdin could
 716                         // block. This doesn't appear to happen with tidy, because tidy only
 717                         // writes to stdout after it's finished reading from stdin. Search
 718                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 719                         fwrite($pipes[0], $text);
 720                         fclose($pipes[0]);
 721                         while (!feof($pipes[1])) {
 722                                 $cleansource .= fgets($pipes[1], 1024);
 723                         }
 724                         fclose($pipes[1]);
 725                         proc_close($process);
 726                 }
 727
 728                 wfProfileOut( $fname );
 729
 730                 if( $cleansource == '' && $text != '') {
 731                         // Some kind of error happened, so we couldn't get the corrected text.
 732                         // Just give up; we'll use the source text and append a warning.
 733                         return null;
 734                 } else {
 735                         return $cleansource;
 736                 }
 737         }
 738
 739         /**
 740          * Use the HTML tidy PECL extension to use the tidy library in-process,
 741          * saving the overhead of spawning a new process.
 742          *
 743          * 'pear install tidy' should be able to compile the extension module.
 744          *
 745          * @private
 746          * @static
 747          */
 748         function internalTidy( $text ) {
 749                 global $wgTidyConf, $IP, $wgDebugTidy;
 750                 $fname = 'Parser::internalTidy';
 751                 wfProfileIn( $fname );
 752
 753                 $tidy = new tidy;
 754                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 755                 $tidy->cleanRepair();
 756                 if( $tidy->getStatus() == 2 ) {
 757                         // 2 is magic number for fatal error
 758                         // http://www.php.net/manual/en/function.tidy-get-status.php
 759                         $cleansource = null;
 760                 } else {
 761                         $cleansource = tidy_get_output( $tidy );
 762                 }
 763                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 764                         $cleansource .= "<!--\nTidy reports:\n" .
 765                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 766                                 "\n-->";
 767                 }
 768
 769                 wfProfileOut( $fname );
 770                 return $cleansource;
 771         }
 772
 773         /**
 774          * parse the wiki syntax used to render tables
 775          *
 776          * @private
 777          */
 778         function doTableStuff ( $text ) {
 779                 $fname = 'Parser::doTableStuff';
 780                 wfProfileIn( $fname );
 781
 782                 $lines = explode ( "\n" , $text );
 783                 $td_history = array (); // Is currently a td tag open?
 784                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 785                 $tr_history = array (); // Is currently a tr tag open?
 786                 $tr_attributes = array (); // history of tr attributes
 787                 $has_opened_tr = array(); // Did this table open a <tr> element?
 788                 $indent_level = 0; // indent level of the table
 789                 foreach ( $lines as $key => $line )
 790                 {
 791                         $line = trim ( $line );
 792
 793                         if( $line == '' ) { // empty line, go to next line
 794                                 continue;
 795                         }
 796                         $first_character = $line{0};
 797                         $matches = array();
 798
 799                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 800                                 // First check if we are starting a new table
 801                                 $indent_level = strlen( $matches[1] );
 802
 803                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 804                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 805
 806                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 807                                 array_push ( $td_history , false );
 808                                 array_push ( $last_tag_history , '' );
 809                                 array_push ( $tr_history , false );
 810                                 array_push ( $tr_attributes , '' );
 811                                 array_push ( $has_opened_tr , false );
 812                         } else if ( count ( $td_history ) == 0 ) {
 813                                 // Don't do any of the following
 814                                 continue;
 815                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 816                                 // We are ending a table
 817                                 $line = '</table>' . substr ( $line , 2 );
 818                                 $last_tag = array_pop ( $last_tag_history );
 819
 820                                 if ( !array_pop ( $has_opened_tr ) ) {
 821                                         $line = "<tr><td></td></tr>{$line}";
 822                                 }
 823
 824                                 if ( array_pop ( $tr_history ) ) {
 825                                         $line = "</tr>{$line}";
 826                                 }
 827
 828                                 if ( array_pop ( $td_history ) ) {
 829                                         $line = "</{$last_tag}>{$line}";
 830                                 }
 831                                 array_pop ( $tr_attributes );
 832                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 833                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 834                                 // Now we have a table row
 835                                 $line = preg_replace( '#^\|-+#', '', $line );
 836
 837                                 // Whats after the tag is now only attributes
 838                                 $attributes = $this->mStripState->unstripBoth( $line );
 839                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 840                                 array_pop ( $tr_attributes );
 841                                 array_push ( $tr_attributes , $attributes );
 842
 843                                 $line = '';
 844                                 $last_tag = array_pop ( $last_tag_history );
 845                                 array_pop ( $has_opened_tr );
 846                                 array_push ( $has_opened_tr , true );
 847
 848                                 if ( array_pop ( $tr_history ) ) {
 849                                         $line = '</tr>';
 850                                 }
 851
 852                                 if ( array_pop ( $td_history ) ) {
 853                                         $line = "</{$last_tag}>{$line}";
 854                                 }
 855
 856                                 $lines[$key] = $line;
 857                                 array_push ( $tr_history , false );
 858                                 array_push ( $td_history , false );
 859                                 array_push ( $last_tag_history , '' );
 860                         }
 861                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 862                                 // This might be cell elements, td, th or captions
 863                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 864                                         $first_character = '+';
 865                                         $line = substr ( $line , 1 );
 866                                 }
 867
 868                                 $line = substr ( $line , 1 );
 869
 870                                 if ( $first_character == '!' ) {
 871                                         $line = str_replace ( '!!' , '||' , $line );
 872                                 }
 873
 874                                 // Split up multiple cells on the same line.
 875                                 // FIXME : This can result in improper nesting of tags processed
 876                                 // by earlier parser steps, but should avoid splitting up eg
 877                                 // attribute values containing literal "||".
 878                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 879
 880                                 $lines[$key] = '';
 881
 882                                 // Loop through each table cell
 883                                 foreach ( $cells as $cell )
 884                                 {
 885                                         $previous = '';
 886                                         if ( $first_character != '+' )
 887                                         {
 888                                                 $tr_after = array_pop ( $tr_attributes );
 889                                                 if ( !array_pop ( $tr_history ) ) {
 890                                                         $previous = "<tr{$tr_after}>\n";
 891                                                 }
 892                                                 array_push ( $tr_history , true );
 893                                                 array_push ( $tr_attributes , '' );
 894                                                 array_pop ( $has_opened_tr );
 895                                                 array_push ( $has_opened_tr , true );
 896                                         }
 897
 898                                         $last_tag = array_pop ( $last_tag_history );
 899
 900                                         if ( array_pop ( $td_history ) ) {
 901                                                 $previous = "</{$last_tag}>{$previous}";
 902                                         }
 903
 904                                         if ( $first_character == '|' ) {
 905                                                 $last_tag = 'td';
 906                                         } else if ( $first_character == '!' ) {
 907                                                 $last_tag = 'th';
 908                                         } else if ( $first_character == '+' ) {
 909                                                 $last_tag = 'caption';
 910                                         } else {
 911                                                 $last_tag = '';
 912                                         }
 913
 914                                         array_push ( $last_tag_history , $last_tag );
 915
 916                                         // A cell could contain both parameters and data
 917                                         $cell_data = explode ( '|' , $cell , 2 );
 918
 919                                         // Bug 553: Note that a '|' inside an invalid link should not
 920                                         // be mistaken as delimiting cell parameters
 921                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 922                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 923                                         } else if ( count ( $cell_data ) == 1 )
 924                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 925                                         else {
 926                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 927                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 928                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 929                                         }
 930
 931                                         $lines[$key] .= $cell;
 932                                         array_push ( $td_history , true );
 933                                 }
 934                         }
 935                 }
 936
 937                 // Closing open td, tr && table
 938                 while ( count ( $td_history ) > 0 )
 939                 {
 940                         if ( array_pop ( $td_history ) ) {
 941                                 $lines[] = '</td>' ;
 942                         }
 943                         if ( array_pop ( $tr_history ) ) {
 944                                 $lines[] = '</tr>' ;
 945                         }
 946                         if ( !array_pop ( $has_opened_tr ) ) {
 947                                 $lines[] = "<tr><td></td></tr>" ;
 948                         }
 949
 950                         $lines[] = '</table>' ;
 951                 }
 952
 953                 $output = implode ( "\n" , $lines ) ;
 954
 955                 // special case: don't return empty table
 956                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 957                         $output = '';
 958                 }
 959
 960                 wfProfileOut( $fname );
 961
 962                 return $output;
 963         }
 964
 965         /**
 966          * Helper function for parse() that transforms wiki markup into
 967          * HTML. Only called for $mOutputType == self::OT_HTML.
 968          *
 969          * @private
 970          */
 971         function internalParse( $text ) {
 972                 $isMain = true;
 973                 $fname = 'Parser::internalParse';
 974                 wfProfileIn( $fname );
 975
 976                 # Hook to suspend the parser in this state
 977                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 978                         wfProfileOut( $fname );
 979                         return $text ;
 980                 }
 981
 982                 $text = $this->replaceVariables( $text );
 983                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 984                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 985
 986                 // Tables need to come after variable replacement for things to work
 987                 // properly; putting them before other transformations should keep
 988                 // exciting things like link expansions from showing up in surprising
 989                 // places.
 990                 $text = $this->doTableStuff( $text );
 991
 992                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 993
 994                 $text = $this->stripToc( $text );
 995                 $this->stripNoGallery( $text );
 996                 $text = $this->doHeadings( $text );
 997                 if($this->mOptions->getUseDynamicDates()) {
 998                         $df =& DateFormatter::getInstance();
 999                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1000                 }
1001                 $text = $this->doAllQuotes( $text );
1002                 $text = $this->replaceInternalLinks( $text );
1003                 $text = $this->replaceExternalLinks( $text );
1004
1005                 # replaceInternalLinks may sometimes leave behind
1006                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1007                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1008
1009                 $text = $this->doMagicLinks( $text );
1010                 $text = $this->formatHeadings( $text, $isMain );
1011
1012                 wfProfileOut( $fname );
1013                 return $text;
1014         }
1015
1016         /**
1017          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1018          * magic external links.
1019          *
1020          * @private
1021          */
1022         function doMagicLinks( $text ) {
1023                 wfProfileIn( __METHOD__ );
1024                 $text = preg_replace_callback(
1025                         '!(?:                           # Start cases
1026                             <a.*?</a> |                 # Skip link text
1027                             <.*?> |                     # Skip stuff inside HTML elements
1028                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1029                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1030                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1031                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1032                                      [0-9Xx]                 # check digit
1033                                    \b)
1034                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1035                 wfProfileOut( __METHOD__ );
1036                 return $text;
1037         }
1038
1039         function magicLinkCallback( $m ) {
1040                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1041                         # Skip HTML element
1042                         return $m[0];
1043                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1044                         $isbn = $m[2];
1045                         $num = strtr( $isbn, array(
1046                                 '-' => '',
1047                                 ' ' => '',
1048                                 'x' => 'X',
1049                         ));
1050                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1051                         $text = '<a href="' .
1052                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1053                                 "\" class=\"internal\">ISBN $isbn</a>";
1054                 } else {
1055                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1056                                 $keyword = 'RFC';
1057                                 $urlmsg = 'rfcurl';
1058                                 $id = $m[1];
1059                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1060                                 $keyword = 'PMID';
1061                                 $urlmsg = 'pubmedurl';
1062                                 $id = $m[1];
1063                         } else {
1064                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1065                                         substr($m[0], 0, 20 ) . '"' );
1066                         }
1067
1068                         $url = wfMsg( $urlmsg, $id);
1069                         $sk = $this->mOptions->getSkin();
1070                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1071                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1072                 }
1073                 return $text;
1074         }
1075
1076         /**
1077          * Parse headers and return html
1078          *
1079          * @private
1080          */
1081         function doHeadings( $text ) {
1082                 $fname = 'Parser::doHeadings';
1083                 wfProfileIn( $fname );
1084                 for ( $i = 6; $i >= 1; --$i ) {
1085                         $h = str_repeat( '=', $i );
1086                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1087                           "<h$i>\\1</h$i>", $text );
1088                 }
1089                 wfProfileOut( $fname );
1090                 return $text;
1091         }
1092
1093         /**
1094          * Replace single quotes with HTML markup
1095          * @private
1096          * @return string the altered text
1097          */
1098         function doAllQuotes( $text ) {
1099                 $fname = 'Parser::doAllQuotes';
1100                 wfProfileIn( $fname );
1101                 $outtext = '';
1102                 $lines = explode( "\n", $text );
1103                 foreach ( $lines as $line ) {
1104                         $outtext .= $this->doQuotes ( $line ) . "\n";
1105                 }
1106                 $outtext = substr($outtext, 0,-1);
1107                 wfProfileOut( $fname );
1108                 return $outtext;
1109         }
1110
1111         /**
1112          * Helper function for doAllQuotes()
1113          */
1114         public function doQuotes( $text ) {
1115                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1116                 if ( count( $arr ) == 1 )
1117                         return $text;
1118                 else
1119                 {
1120                         # First, do some preliminary work. This may shift some apostrophes from
1121                         # being mark-up to being text. It also counts the number of occurrences
1122                         # of bold and italics mark-ups.
1123                         $i = 0;
1124                         $numbold = 0;
1125                         $numitalics = 0;
1126                         foreach ( $arr as $r )
1127                         {
1128                                 if ( ( $i % 2 ) == 1 )
1129                                 {
1130                                         # If there are ever four apostrophes, assume the first is supposed to
1131                                         # be text, and the remaining three constitute mark-up for bold text.
1132                                         if ( strlen( $arr[$i] ) == 4 )
1133                                         {
1134                                                 $arr[$i-1] .= "'";
1135                                                 $arr[$i] = "'''";
1136                                         }
1137                                         # If there are more than 5 apostrophes in a row, assume they're all
1138                                         # text except for the last 5.
1139                                         else if ( strlen( $arr[$i] ) > 5 )
1140                                         {
1141                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1142                                                 $arr[$i] = "'''''";
1143                                         }
1144                                         # Count the number of occurrences of bold and italics mark-ups.
1145                                         # We are not counting sequences of five apostrophes.
1146                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1147                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1148                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1149                                 }
1150                                 $i++;
1151                         }
1152
1153                         # If there is an odd number of both bold and italics, it is likely
1154                         # that one of the bold ones was meant to be an apostrophe followed
1155                         # by italics. Which one we cannot know for certain, but it is more
1156                         # likely to be one that has a single-letter word before it.
1157                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1158                         {
1159                                 $i = 0;
1160                                 $firstsingleletterword = -1;
1161                                 $firstmultiletterword = -1;
1162                                 $firstspace = -1;
1163                                 foreach ( $arr as $r )
1164                                 {
1165                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1166                                         {
1167                                                 $x1 = substr ($arr[$i-1], -1);
1168                                                 $x2 = substr ($arr[$i-1], -2, 1);
1169                                                 if ($x1 == ' ') {
1170                                                         if ($firstspace == -1) $firstspace = $i;
1171                                                 } else if ($x2 == ' ') {
1172                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1173                                                 } else {
1174                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1175                                                 }
1176                                         }
1177                                         $i++;
1178                                 }
1179
1180                                 # If there is a single-letter word, use it!
1181                                 if ($firstsingleletterword > -1)
1182                                 {
1183                                         $arr [ $firstsingleletterword ] = "''";
1184                                         $arr [ $firstsingleletterword-1 ] .= "'";
1185                                 }
1186                                 # If not, but there's a multi-letter word, use that one.
1187                                 else if ($firstmultiletterword > -1)
1188                                 {
1189                                         $arr [ $firstmultiletterword ] = "''";
1190                                         $arr [ $firstmultiletterword-1 ] .= "'";
1191                                 }
1192                                 # ... otherwise use the first one that has neither.
1193                                 # (notice that it is possible for all three to be -1 if, for example,
1194                                 # there is only one pentuple-apostrophe in the line)
1195                                 else if ($firstspace > -1)
1196                                 {
1197                                         $arr [ $firstspace ] = "''";
1198                                         $arr [ $firstspace-1 ] .= "'";
1199                                 }
1200                         }
1201
1202                         # Now let's actually convert our apostrophic mush to HTML!
1203                         $output = '';
1204                         $buffer = '';
1205                         $state = '';
1206                         $i = 0;
1207                         foreach ($arr as $r)
1208                         {
1209                                 if (($i % 2) == 0)
1210                                 {
1211                                         if ($state == 'both')
1212                                                 $buffer .= $r;
1213                                         else
1214                                                 $output .= $r;
1215                                 }
1216                                 else
1217                                 {
1218                                         if (strlen ($r) == 2)
1219                                         {
1220                                                 if ($state == 'i')
1221                                                 { $output .= '</i>'; $state = ''; }
1222                                                 else if ($state == 'bi')
1223                                                 { $output .= '</i>'; $state = 'b'; }
1224                                                 else if ($state == 'ib')
1225                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1226                                                 else if ($state == 'both')
1227                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1228                                                 else # $state can be 'b' or ''
1229                                                 { $output .= '<i>'; $state .= 'i'; }
1230                                         }
1231                                         else if (strlen ($r) == 3)
1232                                         {
1233                                                 if ($state == 'b')
1234                                                 { $output .= '</b>'; $state = ''; }
1235                                                 else if ($state == 'bi')
1236                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1237                                                 else if ($state == 'ib')
1238                                                 { $output .= '</b>'; $state = 'i'; }
1239                                                 else if ($state == 'both')
1240                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1241                                                 else # $state can be 'i' or ''
1242                                                 { $output .= '<b>'; $state .= 'b'; }
1243                                         }
1244                                         else if (strlen ($r) == 5)
1245                                         {
1246                                                 if ($state == 'b')
1247                                                 { $output .= '</b><i>'; $state = 'i'; }
1248                                                 else if ($state == 'i')
1249                                                 { $output .= '</i><b>'; $state = 'b'; }
1250                                                 else if ($state == 'bi')
1251                                                 { $output .= '</i></b>'; $state = ''; }
1252                                                 else if ($state == 'ib')
1253                                                 { $output .= '</b></i>'; $state = ''; }
1254                                                 else if ($state == 'both')
1255                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1256                                                 else # ($state == '')
1257                                                 { $buffer = ''; $state = 'both'; }
1258                                         }
1259                                 }
1260                                 $i++;
1261                         }
1262                         # Now close all remaining tags.  Notice that the order is important.
1263                         if ($state == 'b' || $state == 'ib')
1264                                 $output .= '</b>';
1265                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1266                                 $output .= '</i>';
1267                         if ($state == 'bi')
1268                                 $output .= '</b>';
1269                         # There might be lonely ''''', so make sure we have a buffer
1270                         if ($state == 'both' && $buffer)
1271                                 $output .= '<b><i>'.$buffer.'</i></b>';
1272                         return $output;
1273                 }
1274         }
1275
1276         /**
1277          * Replace external links
1278          *
1279          * Note: this is all very hackish and the order of execution matters a lot.
1280          * Make sure to run maintenance/parserTests.php if you change this code.
1281          *
1282          * @private
1283          */
1284         function replaceExternalLinks( $text ) {
1285                 global $wgContLang;
1286                 $fname = 'Parser::replaceExternalLinks';
1287                 wfProfileIn( $fname );
1288
1289                 $sk = $this->mOptions->getSkin();
1290
1291                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1292
1293                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1294
1295                 $i = 0;
1296                 while ( $i<count( $bits ) ) {
1297                         $url = $bits[$i++];
1298                         $protocol = $bits[$i++];
1299                         $text = $bits[$i++];
1300                         $trail = $bits[$i++];
1301
1302                         # The characters '<' and '>' (which were escaped by
1303                         # removeHTMLtags()) should not be included in
1304                         # URLs, per RFC 2396.
1305                         $m2 = array();
1306                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1307                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1308                                 $url = substr($url, 0, $m2[0][1]);
1309                         }
1310
1311                         # If the link text is an image URL, replace it with an <img> tag
1312                         # This happened by accident in the original parser, but some people used it extensively
1313                         $img = $this->maybeMakeExternalImage( $text );
1314                         if ( $img !== false ) {
1315                                 $text = $img;
1316                         }
1317
1318                         $dtrail = '';
1319
1320                         # Set linktype for CSS - if URL==text, link is essentially free
1321                         $linktype = ($text == $url) ? 'free' : 'text';
1322
1323                         # No link text, e.g. [http://domain.tld/some.link]
1324                         if ( $text == '' ) {
1325                                 # Autonumber if allowed. See bug #5918
1326                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1327                                         $text = '[' . ++$this->mAutonumber . ']';
1328                                         $linktype = 'autonumber';
1329                                 } else {
1330                                         # Otherwise just use the URL
1331                                         $text = htmlspecialchars( $url );
1332                                         $linktype = 'free';
1333                                 }
1334                         } else {
1335                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1336                                 # Check for trail
1337                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1338                         }
1339
1340                         $text = $wgContLang->markNoConversion($text);
1341
1342                         $url = Sanitizer::cleanUrl( $url );
1343
1344                         # Process the trail (i.e. everything after this link up until start of the next link),
1345                         # replacing any non-bracketed links
1346                         $trail = $this->replaceFreeExternalLinks( $trail );
1347
1348                         # Use the encoded URL
1349                         # This means that users can paste URLs directly into the text
1350                         # Funny characters like &ouml; aren't valid in URLs anyway
1351                         # This was changed in August 2004
1352                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1353
1354                         # Register link in the output object.
1355                         # Replace unnecessary URL escape codes with the referenced character
1356                         # This prevents spammers from hiding links from the filters
1357                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1358                         $this->mOutput->addExternalLink( $pasteurized );
1359                 }
1360
1361                 wfProfileOut( $fname );
1362                 return $s;
1363         }
1364
1365         /**
1366          * Replace anything that looks like a URL with a link
1367          * @private
1368          */
1369         function replaceFreeExternalLinks( $text ) {
1370                 global $wgContLang;
1371                 $fname = 'Parser::replaceFreeExternalLinks';
1372                 wfProfileIn( $fname );
1373
1374                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1375                 $s = array_shift( $bits );
1376                 $i = 0;
1377
1378                 $sk = $this->mOptions->getSkin();
1379
1380                 while ( $i < count( $bits ) ){
1381                         $protocol = $bits[$i++];
1382                         $remainder = $bits[$i++];
1383
1384                         $m = array();
1385                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1386                                 # Found some characters after the protocol that look promising
1387                                 $url = $protocol . $m[1];
1388                                 $trail = $m[2];
1389
1390                                 # special case: handle urls as url args:
1391                                 # http://www.example.com/foo?=http://www.example.com/bar
1392                                 if(strlen($trail) == 0 &&
1393                                         isset($bits[$i]) &&
1394                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1395                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1396                                 {
1397                                         # add protocol, arg
1398                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1399                                         $i += 2;
1400                                         $trail = $m[2];
1401                                 }
1402
1403                                 # The characters '<' and '>' (which were escaped by
1404                                 # removeHTMLtags()) should not be included in
1405                                 # URLs, per RFC 2396.
1406                                 $m2 = array();
1407                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1408                                         $trail = substr($url, $m2[0][1]) . $trail;
1409                                         $url = substr($url, 0, $m2[0][1]);
1410                                 }
1411
1412                                 # Move trailing punctuation to $trail
1413                                 $sep = ',;\.:!?';
1414                                 # If there is no left bracket, then consider right brackets fair game too
1415                                 if ( strpos( $url, '(' ) === false ) {
1416                                         $sep .= ')';
1417                                 }
1418
1419                                 $numSepChars = strspn( strrev( $url ), $sep );
1420                                 if ( $numSepChars ) {
1421                                         $trail = substr( $url, -$numSepChars ) . $trail;
1422                                         $url = substr( $url, 0, -$numSepChars );
1423                                 }
1424
1425                                 $url = Sanitizer::cleanUrl( $url );
1426
1427                                 # Is this an external image?
1428                                 $text = $this->maybeMakeExternalImage( $url );
1429                                 if ( $text === false ) {
1430                                         # Not an image, make a link
1431                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1432                                         # Register it in the output object...
1433                                         # Replace unnecessary URL escape codes with their equivalent characters
1434                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1435                                         $this->mOutput->addExternalLink( $pasteurized );
1436                                 }
1437                                 $s .= $text . $trail;
1438                         } else {
1439                                 $s .= $protocol . $remainder;
1440                         }
1441                 }
1442                 wfProfileOut( $fname );
1443                 return $s;
1444         }
1445
1446         /**
1447          * Replace unusual URL escape codes with their equivalent characters
1448          * @param string
1449          * @return string
1450          * @static
1451          * @todo  This can merge genuinely required bits in the path or query string,
1452          *        breaking legit URLs. A proper fix would treat the various parts of
1453          *        the URL differently; as a workaround, just use the output for
1454          *        statistical records, not for actual linking/output.
1455          */
1456         static function replaceUnusualEscapes( $url ) {
1457                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1458                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1459         }
1460
1461         /**
1462          * Callback function used in replaceUnusualEscapes().
1463          * Replaces unusual URL escape codes with their equivalent character
1464          * @static
1465          * @private
1466          */
1467         private static function replaceUnusualEscapesCallback( $matches ) {
1468                 $char = urldecode( $matches[0] );
1469                 $ord = ord( $char );
1470                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1471                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1472                         // No, shouldn't be escaped
1473                         return $char;
1474                 } else {
1475                         // Yes, leave it escaped
1476                         return $matches[0];
1477                 }
1478         }
1479
1480         /**
1481          * make an image if it's allowed, either through the global
1482          * option or through the exception
1483          * @private
1484          */
1485         function maybeMakeExternalImage( $url ) {
1486                 $sk = $this->mOptions->getSkin();
1487                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1488                 $imagesexception = !empty($imagesfrom);
1489                 $text = false;
1490                 if ( $this->mOptions->getAllowExternalImages()
1491                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1492                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1493                                 # Image found
1494                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1495                         }
1496                 }
1497                 return $text;
1498         }
1499
1500         /**
1501          * Process [[ ]] wikilinks
1502          *
1503          * @private
1504          */
1505         function replaceInternalLinks( $s ) {
1506                 global $wgContLang;
1507                 static $fname = 'Parser::replaceInternalLinks' ;
1508
1509                 wfProfileIn( $fname );
1510
1511                 wfProfileIn( $fname.'-setup' );
1512                 static $tc = FALSE;
1513                 # the % is needed to support urlencoded titles as well
1514                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1515
1516                 $sk = $this->mOptions->getSkin();
1517
1518                 #split the entire text string on occurences of [[
1519                 $a = explode( '[[', ' ' . $s );
1520                 #get the first element (all text up to first [[), and remove the space we added
1521                 $s = array_shift( $a );
1522                 $s = substr( $s, 1 );
1523
1524                 # Match a link having the form [[namespace:link|alternate]]trail
1525                 static $e1 = FALSE;
1526                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1527                 # Match cases where there is no "]]", which might still be images
1528                 static $e1_img = FALSE;
1529                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1530
1531                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1532                 $e2 = null;
1533                 if ( $useLinkPrefixExtension ) {
1534                         # Match the end of a line for a word that's not followed by whitespace,
1535                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1536                         $e2 = wfMsgForContent( 'linkprefix' );
1537                 }
1538
1539                 if( is_null( $this->mTitle ) ) {
1540                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1541                 }
1542                 $nottalk = !$this->mTitle->isTalkPage();
1543
1544                 if ( $useLinkPrefixExtension ) {
1545                         $m = array();
1546                         if ( preg_match( $e2, $s, $m ) ) {
1547                                 $first_prefix = $m[2];
1548                         } else {
1549                                 $first_prefix = false;
1550                         }
1551                 } else {
1552                         $prefix = '';
1553                 }
1554
1555                 if($wgContLang->hasVariants()) {
1556                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1557                 } else {
1558                         $selflink = array($this->mTitle->getPrefixedText());
1559                 }
1560                 $useSubpages = $this->areSubpagesAllowed();
1561                 wfProfileOut( $fname.'-setup' );
1562
1563                 # Loop for each link
1564                 for ($k = 0; isset( $a[$k] ); $k++) {
1565                         $line = $a[$k];
1566                         if ( $useLinkPrefixExtension ) {
1567                                 wfProfileIn( $fname.'-prefixhandling' );
1568                                 if ( preg_match( $e2, $s, $m ) ) {
1569                                         $prefix = $m[2];
1570                                         $s = $m[1];
1571                                 } else {
1572                                         $prefix='';
1573                                 }
1574                                 # first link
1575                                 if($first_prefix) {
1576                                         $prefix = $first_prefix;
1577                                         $first_prefix = false;
1578                                 }
1579                                 wfProfileOut( $fname.'-prefixhandling' );
1580                         }
1581
1582                         $might_be_img = false;
1583
1584                         wfProfileIn( "$fname-e1" );
1585                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1586                                 $text = $m[2];
1587                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1588                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1589                                 # the real problem is with the $e1 regex
1590                                 # See bug 1300.
1591                                 #
1592                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1593                                 # and no image is in sight. See bug 2095.
1594                                 #
1595                                 if( $text !== '' &&
1596                                         substr( $m[3], 0, 1 ) === ']' &&
1597                                         strpos($text, '[') !== false
1598                                 )
1599                                 {
1600                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1601                                         $m[3] = substr( $m[3], 1 );
1602                                 }
1603                                 # fix up urlencoded title texts
1604                                 if( strpos( $m[1], '%' ) !== false ) {
1605                                         # Should anchors '#' also be rejected?
1606                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1607                                 }
1608                                 $trail = $m[3];
1609                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1610                                 $might_be_img = true;
1611                                 $text = $m[2];
1612                                 if ( strpos( $m[1], '%' ) !== false ) {
1613                                         $m[1] = urldecode($m[1]);
1614                                 }
1615                                 $trail = "";
1616                         } else { # Invalid form; output directly
1617                                 $s .= $prefix . '[[' . $line ;
1618                                 wfProfileOut( "$fname-e1" );
1619                                 continue;
1620                         }
1621                         wfProfileOut( "$fname-e1" );
1622                         wfProfileIn( "$fname-misc" );
1623
1624                         # Don't allow internal links to pages containing
1625                         # PROTO: where PROTO is a valid URL protocol; these
1626                         # should be external links.
1627                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1628                                 $s .= $prefix . '[[' . $line ;
1629                                 continue;
1630                         }
1631
1632                         # Make subpage if necessary
1633                         if( $useSubpages ) {
1634                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1635                         } else {
1636                                 $link = $m[1];
1637                         }
1638
1639                         $noforce = (substr($m[1], 0, 1) != ':');
1640                         if (!$noforce) {
1641                                 # Strip off leading ':'
1642                                 $link = substr($link, 1);
1643                         }
1644
1645                         wfProfileOut( "$fname-misc" );
1646                         wfProfileIn( "$fname-title" );
1647                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1648                         if( !$nt ) {
1649                                 $s .= $prefix . '[[' . $line;
1650                                 wfProfileOut( "$fname-title" );
1651                                 continue;
1652                         }
1653
1654                         $ns = $nt->getNamespace();
1655                         $iw = $nt->getInterWiki();
1656                         wfProfileOut( "$fname-title" );
1657
1658                         if ($might_be_img) { # if this is actually an invalid link
1659                                 wfProfileIn( "$fname-might_be_img" );
1660                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1661                                         $found = false;
1662                                         while (isset ($a[$k+1]) ) {
1663                                                 #look at the next 'line' to see if we can close it there
1664                                                 $spliced = array_splice( $a, $k + 1, 1 );
1665                                                 $next_line = array_shift( $spliced );
1666                                                 $m = explode( ']]', $next_line, 3 );
1667                                                 if ( count( $m ) == 3 ) {
1668                                                         # the first ]] closes the inner link, the second the image
1669                                                         $found = true;
1670                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1671                                                         $trail = $m[2];
1672                                                         break;
1673                                                 } elseif ( count( $m ) == 2 ) {
1674                                                         #if there's exactly one ]] that's fine, we'll keep looking
1675                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1676                                                 } else {
1677                                                         #if $next_line is invalid too, we need look no further
1678                                                         $text .= '[[' . $next_line;
1679                                                         break;
1680                                                 }
1681                                         }
1682                                         if ( !$found ) {
1683                                                 # we couldn't find the end of this imageLink, so output it raw
1684                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1685                                                 $text = $this->replaceInternalLinks($text);
1686                                                 $s .= "{$prefix}[[$link|$text";
1687                                                 # note: no $trail, because without an end, there *is* no trail
1688                                                 wfProfileOut( "$fname-might_be_img" );
1689                                                 continue;
1690                                         }
1691                                 } else { #it's not an image, so output it raw
1692                                         $s .= "{$prefix}[[$link|$text";
1693                                         # note: no $trail, because without an end, there *is* no trail
1694                                         wfProfileOut( "$fname-might_be_img" );
1695                                         continue;
1696                                 }
1697                                 wfProfileOut( "$fname-might_be_img" );
1698                         }
1699
1700                         $wasblank = ( '' == $text );
1701                         if( $wasblank ) $text = $link;
1702
1703                         # Link not escaped by : , create the various objects
1704                         if( $noforce ) {
1705
1706                                 # Interwikis
1707                                 wfProfileIn( "$fname-interwiki" );
1708                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1709                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1710                                         $s = rtrim($s . $prefix);
1711                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1712                                         wfProfileOut( "$fname-interwiki" );
1713                                         continue;
1714                                 }
1715                                 wfProfileOut( "$fname-interwiki" );
1716
1717                                 if ( $ns == NS_IMAGE ) {
1718                                         wfProfileIn( "$fname-image" );
1719                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1720                                                 # recursively parse links inside the image caption
1721                                                 # actually, this will parse them in any other parameters, too,
1722                                                 # but it might be hard to fix that, and it doesn't matter ATM
1723                                                 $text = $this->replaceExternalLinks($text);
1724                                                 $text = $this->replaceInternalLinks($text);
1725
1726                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1727                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1728                                                 $this->mOutput->addImage( $nt->getDBkey() );
1729
1730                                                 wfProfileOut( "$fname-image" );
1731                                                 continue;
1732                                         } else {
1733                                                 # We still need to record the image's presence on the page
1734                                                 $this->mOutput->addImage( $nt->getDBkey() );
1735                                         }
1736                                         wfProfileOut( "$fname-image" );
1737
1738                                 }
1739
1740                                 if ( $ns == NS_CATEGORY ) {
1741                                         wfProfileIn( "$fname-category" );
1742                                         $s = rtrim($s . "\n"); # bug 87
1743
1744                                         if ( $wasblank ) {
1745                                                 $sortkey = $this->getDefaultSort();
1746                                         } else {
1747                                                 $sortkey = $text;
1748                                         }
1749                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1750                                         $sortkey = str_replace( "\n", '', $sortkey );
1751                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1752                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1753
1754                                         /**
1755                                          * Strip the whitespace Category links produce, see bug 87
1756                                          * @todo We might want to use trim($tmp, "\n") here.
1757                                          */
1758                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1759
1760                                         wfProfileOut( "$fname-category" );
1761                                         continue;
1762                                 }
1763                         }
1764
1765                         # Self-link checking
1766                         if( $nt->getFragment() === '' ) {
1767                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1768                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1769                                         continue;
1770                                 }
1771                         }
1772
1773                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1774                         if( $ns == NS_MEDIA ) {
1775                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1776                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1777                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1778                                 $this->mOutput->addImage( $nt->getDBkey() );
1779                                 continue;
1780                         } elseif( $ns == NS_SPECIAL ) {
1781                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1782                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1783                                 } else {
1784                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1785                                 }
1786                                 continue;
1787                         } elseif( $ns == NS_IMAGE ) {
1788                                 $img = wfFindFile( $nt );
1789                                 if( $img ) {
1790                                         // Force a blue link if the file exists; may be a remote
1791                                         // upload on the shared repository, and we want to see its
1792                                         // auto-generated page.
1793                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1794                                         $this->mOutput->addLink( $nt );
1795                                         continue;
1796                                 }
1797                         }
1798                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1799                 }
1800                 wfProfileOut( $fname );
1801                 return $s;
1802         }
1803
1804         /**
1805          * Make a link placeholder. The text returned can be later resolved to a real link with
1806          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1807          * parsing of interwiki links, and secondly to allow all existence checks and
1808          * article length checks (for stub links) to be bundled into a single query.
1809          *
1810          */
1811         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1812                 wfProfileIn( __METHOD__ );
1813                 if ( ! is_object($nt) ) {
1814                         # Fail gracefully
1815                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1816                 } else {
1817                         # Separate the link trail from the rest of the link
1818                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1819
1820                         if ( $nt->isExternal() ) {
1821                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1822                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1823                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1824                         } else {
1825                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1826                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1827                                 $this->mLinkHolders['queries'][] = $query;
1828                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1829                                 $this->mLinkHolders['titles'][] = $nt;
1830
1831                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1832                         }
1833                 }
1834                 wfProfileOut( __METHOD__ );
1835                 return $retVal;
1836         }
1837
1838         /**
1839          * Render a forced-blue link inline; protect against double expansion of
1840          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1841          * Since this little disaster has to split off the trail text to avoid
1842          * breaking URLs in the following text without breaking trails on the
1843          * wiki links, it's been made into a horrible function.
1844          *
1845          * @param Title $nt
1846          * @param string $text
1847          * @param string $query
1848          * @param string $trail
1849          * @param string $prefix
1850          * @return string HTML-wikitext mix oh yuck
1851          */
1852         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1853                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1854                 $sk = $this->mOptions->getSkin();
1855                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1856                 return $this->armorLinks( $link ) . $trail;
1857         }
1858
1859         /**
1860          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1861          * going to go through further parsing steps before inline URL expansion.
1862          *
1863          * In particular this is important when using action=render, which causes
1864          * full URLs to be included.
1865          *
1866          * Oh man I hate our multi-layer parser!
1867          *
1868          * @param string more-or-less HTML
1869          * @return string less-or-more HTML with NOPARSE bits
1870          */
1871         function armorLinks( $text ) {
1872                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1873                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1874         }
1875
1876         /**
1877          * Return true if subpage links should be expanded on this page.
1878          * @return bool
1879          */
1880         function areSubpagesAllowed() {
1881                 # Some namespaces don't allow subpages
1882                 global $wgNamespacesWithSubpages;
1883                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1884         }
1885
1886         /**
1887          * Handle link to subpage if necessary
1888          * @param string $target the source of the link
1889          * @param string &$text the link text, modified as necessary
1890          * @return string the full name of the link
1891          * @private
1892          */
1893         function maybeDoSubpageLink($target, &$text) {
1894                 # Valid link forms:
1895                 # Foobar -- normal
1896                 # :Foobar -- override special treatment of prefix (images, language links)
1897                 # /Foobar -- convert to CurrentPage/Foobar
1898                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1899                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1900                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1901
1902                 $fname = 'Parser::maybeDoSubpageLink';
1903                 wfProfileIn( $fname );
1904                 $ret = $target; # default return value is no change
1905
1906                 # Some namespaces don't allow subpages,
1907                 # so only perform processing if subpages are allowed
1908                 if( $this->areSubpagesAllowed() ) {
1909                         $hash = strpos( $target, '#' );
1910                         if( $hash !== false ) {
1911                                 $suffix = substr( $target, $hash );
1912                                 $target = substr( $target, 0, $hash );
1913                         } else {
1914                                 $suffix = '';
1915                         }
1916                         # bug 7425
1917                         $target = trim( $target );
1918                         # Look at the first character
1919                         if( $target != '' && $target{0} == '/' ) {
1920                                 # / at end means we don't want the slash to be shown
1921                                 $m = array();
1922                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1923                                 if( $trailingSlashes ) {
1924                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1925                                 } else {
1926                                         $noslash = substr( $target, 1 );
1927                                 }
1928
1929                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1930                                 if( '' === $text ) {
1931                                         $text = $target . $suffix;
1932                                 } # this might be changed for ugliness reasons
1933                         } else {
1934                                 # check for .. subpage backlinks
1935                                 $dotdotcount = 0;
1936                                 $nodotdot = $target;
1937                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1938                                         ++$dotdotcount;
1939                                         $nodotdot = substr( $nodotdot, 3 );
1940                                 }
1941                                 if($dotdotcount > 0) {
1942                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1943                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1944                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1945                                                 # / at the end means don't show full path
1946                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1947                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1948                                                         if( '' === $text ) {
1949                                                                 $text = $nodotdot . $suffix;
1950                                                         }
1951                                                 }
1952                                                 $nodotdot = trim( $nodotdot );
1953                                                 if( $nodotdot != '' ) {
1954                                                         $ret .= '/' . $nodotdot;
1955                                                 }
1956                                                 $ret .= $suffix;
1957                                         }
1958                                 }
1959                         }
1960                 }
1961
1962                 wfProfileOut( $fname );
1963                 return $ret;
1964         }
1965
1966         /**#@+
1967          * Used by doBlockLevels()
1968          * @private
1969          */
1970         /* private */ function closeParagraph() {
1971                 $result = '';
1972                 if ( '' != $this->mLastSection ) {
1973                         $result = '</' . $this->mLastSection  . ">\n";
1974                 }
1975                 $this->mInPre = false;
1976                 $this->mLastSection = '';
1977                 return $result;
1978         }
1979         # getCommon() returns the length of the longest common substring
1980         # of both arguments, starting at the beginning of both.
1981         #
1982         /* private */ function getCommon( $st1, $st2 ) {
1983                 $fl = strlen( $st1 );
1984                 $shorter = strlen( $st2 );
1985                 if ( $fl < $shorter ) { $shorter = $fl; }
1986
1987                 for ( $i = 0; $i < $shorter; ++$i ) {
1988                         if ( $st1{$i} != $st2{$i} ) { break; }
1989                 }
1990                 return $i;
1991         }
1992         # These next three functions open, continue, and close the list
1993         # element appropriate to the prefix character passed into them.
1994         #
1995         /* private */ function openList( $char ) {
1996                 $result = $this->closeParagraph();
1997
1998                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1999                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
2000                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
2001                 else if ( ';' == $char ) {
2002                         $result .= '<dl><dt>';
2003                         $this->mDTopen = true;
2004                 }
2005                 else { $result = '<!-- ERR 1 -->'; }
2006
2007                 return $result;
2008         }
2009
2010         /* private */ function nextItem( $char ) {
2011                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2012                 else if ( ':' == $char || ';' == $char ) {
2013                         $close = '</dd>';
2014                         if ( $this->mDTopen ) { $close = '</dt>'; }
2015                         if ( ';' == $char ) {
2016                                 $this->mDTopen = true;
2017                                 return $close . '<dt>';
2018                         } else {
2019                                 $this->mDTopen = false;
2020                                 return $close . '<dd>';
2021                         }
2022                 }
2023                 return '<!-- ERR 2 -->';
2024         }
2025
2026         /* private */ function closeList( $char ) {
2027                 if ( '*' == $char ) { $text = '</li></ul>'; }
2028                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2029                 else if ( ':' == $char ) {
2030                         if ( $this->mDTopen ) {
2031                                 $this->mDTopen = false;
2032                                 $text = '</dt></dl>';
2033                         } else {
2034                                 $text = '</dd></dl>';
2035                         }
2036                 }
2037                 else {  return '<!-- ERR 3 -->'; }
2038                 return $text."\n";
2039         }
2040         /**#@-*/
2041
2042         /**
2043          * Make lists from lines starting with ':', '*', '#', etc.
2044          *
2045          * @private
2046          * @return string the lists rendered as HTML
2047          */
2048         function doBlockLevels( $text, $linestart ) {
2049                 $fname = 'Parser::doBlockLevels';
2050                 wfProfileIn( $fname );
2051
2052                 # Parsing through the text line by line.  The main thing
2053                 # happening here is handling of block-level elements p, pre,
2054                 # and making lists from lines starting with * # : etc.
2055                 #
2056                 $textLines = explode( "\n", $text );
2057
2058                 $lastPrefix = $output = '';
2059                 $this->mDTopen = $inBlockElem = false;
2060                 $prefixLength = 0;
2061                 $paragraphStack = false;
2062
2063                 if ( !$linestart ) {
2064                         $output .= array_shift( $textLines );
2065                 }
2066                 foreach ( $textLines as $oLine ) {
2067                         $lastPrefixLength = strlen( $lastPrefix );
2068                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2069                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2070                         if ( !$this->mInPre ) {
2071                                 # Multiple prefixes may abut each other for nested lists.
2072                                 $prefixLength = strspn( $oLine, '*#:;' );
2073                                 $pref = substr( $oLine, 0, $prefixLength );
2074
2075                                 # eh?
2076                                 $pref2 = str_replace( ';', ':', $pref );
2077                                 $t = substr( $oLine, $prefixLength );
2078                                 $this->mInPre = !empty($preOpenMatch);
2079                         } else {
2080                                 # Don't interpret any other prefixes in preformatted text
2081                                 $prefixLength = 0;
2082                                 $pref = $pref2 = '';
2083                                 $t = $oLine;
2084                         }
2085
2086                         # List generation
2087                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2088                                 # Same as the last item, so no need to deal with nesting or opening stuff
2089                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2090                                 $paragraphStack = false;
2091
2092                                 if ( substr( $pref, -1 ) == ';') {
2093                                         # The one nasty exception: definition lists work like this:
2094                                         # ; title : definition text
2095                                         # So we check for : in the remainder text to split up the
2096                                         # title and definition, without b0rking links.
2097                                         $term = $t2 = '';
2098                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2099                                                 $t = $t2;
2100                                                 $output .= $term . $this->nextItem( ':' );
2101                                         }
2102                                 }
2103                         } elseif( $prefixLength || $lastPrefixLength ) {
2104                                 # Either open or close a level...
2105                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2106                                 $paragraphStack = false;
2107
2108                                 while( $commonPrefixLength < $lastPrefixLength ) {
2109                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2110                                         --$lastPrefixLength;
2111                                 }
2112                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2113                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2114                                 }
2115                                 while ( $prefixLength > $commonPrefixLength ) {
2116                                         $char = substr( $pref, $commonPrefixLength, 1 );
2117                                         $output .= $this->openList( $char );
2118
2119                                         if ( ';' == $char ) {
2120                                                 # FIXME: This is dupe of code above
2121                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2122                                                         $t = $t2;
2123                                                         $output .= $term . $this->nextItem( ':' );
2124                                                 }
2125                                         }
2126                                         ++$commonPrefixLength;
2127                                 }
2128                                 $lastPrefix = $pref2;
2129                         }
2130                         if( 0 == $prefixLength ) {
2131                                 wfProfileIn( "$fname-paragraph" );
2132                                 # No prefix (not in list)--go to paragraph mode
2133                                 // XXX: use a stack for nestable elements like span, table and div
2134                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2135                                 $closematch = preg_match(
2136                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2137                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2138                                 if ( $openmatch or $closematch ) {
2139                                         $paragraphStack = false;
2140                                         # TODO bug 5718: paragraph closed
2141                                         $output .= $this->closeParagraph();
2142                                         if ( $preOpenMatch and !$preCloseMatch ) {
2143                                                 $this->mInPre = true;
2144                                         }
2145                                         if ( $closematch ) {
2146                                                 $inBlockElem = false;
2147                                         } else {
2148                                                 $inBlockElem = true;
2149                                         }
2150                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2151                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2152                                                 // pre
2153                                                 if ($this->mLastSection != 'pre') {
2154                                                         $paragraphStack = false;
2155                                                         $output .= $this->closeParagraph().'<pre>';
2156                                                         $this->mLastSection = 'pre';
2157                                                 }
2158                                                 $t = substr( $t, 1 );
2159                                         } else {
2160                                                 // paragraph
2161                                                 if ( '' == trim($t) ) {
2162                                                         if ( $paragraphStack ) {
2163                                                                 $output .= $paragraphStack.'<br />';
2164                                                                 $paragraphStack = false;
2165                                                                 $this->mLastSection = 'p';
2166                                                         } else {
2167                                                                 if ($this->mLastSection != 'p' ) {
2168                                                                         $output .= $this->closeParagraph();
2169                                                                         $this->mLastSection = '';
2170                                                                         $paragraphStack = '<p>';
2171                                                                 } else {
2172                                                                         $paragraphStack = '</p><p>';
2173                                                                 }
2174                                                         }
2175                                                 } else {
2176                                                         if ( $paragraphStack ) {
2177                                                                 $output .= $paragraphStack;
2178                                                                 $paragraphStack = false;
2179                                                                 $this->mLastSection = 'p';
2180                                                         } else if ($this->mLastSection != 'p') {
2181                                                                 $output .= $this->closeParagraph().'<p>';
2182                                                                 $this->mLastSection = 'p';
2183                                                         }
2184                                                 }
2185                                         }
2186                                 }
2187                                 wfProfileOut( "$fname-paragraph" );
2188                         }
2189                         // somewhere above we forget to get out of pre block (bug 785)
2190                         if($preCloseMatch && $this->mInPre) {
2191                                 $this->mInPre = false;
2192                         }
2193                         if ($paragraphStack === false) {
2194                                 $output .= $t."\n";
2195                         }
2196                 }
2197                 while ( $prefixLength ) {
2198                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2199                         --$prefixLength;
2200                 }
2201                 if ( '' != $this->mLastSection ) {
2202                         $output .= '</' . $this->mLastSection . '>';
2203                         $this->mLastSection = '';
2204                 }
2205
2206                 wfProfileOut( $fname );
2207                 return $output;
2208         }
2209
2210         /**
2211          * Split up a string on ':', ignoring any occurences inside tags
2212          * to prevent illegal overlapping.
2213          * @param string $str the string to split
2214          * @param string &$before set to everything before the ':'
2215          * @param string &$after set to everything after the ':'
2216          * return string the position of the ':', or false if none found
2217          */
2218         function findColonNoLinks($str, &$before, &$after) {
2219                 $fname = 'Parser::findColonNoLinks';
2220                 wfProfileIn( $fname );
2221
2222                 $pos = strpos( $str, ':' );
2223                 if( $pos === false ) {
2224                         // Nothing to find!
2225                         wfProfileOut( $fname );
2226                         return false;
2227                 }
2228
2229                 $lt = strpos( $str, '<' );
2230                 if( $lt === false || $lt > $pos ) {
2231                         // Easy; no tag nesting to worry about
2232                         $before = substr( $str, 0, $pos );
2233                         $after = substr( $str, $pos+1 );
2234                         wfProfileOut( $fname );
2235                         return $pos;
2236                 }
2237
2238                 // Ugly state machine to walk through avoiding tags.
2239                 $state = self::COLON_STATE_TEXT;
2240                 $stack = 0;
2241                 $len = strlen( $str );
2242                 for( $i = 0; $i < $len; $i++ ) {
2243                         $c = $str{$i};
2244
2245                         switch( $state ) {
2246                         // (Using the number is a performance hack for common cases)
2247                         case 0: // self::COLON_STATE_TEXT:
2248                                 switch( $c ) {
2249                                 case "<":
2250                                         // Could be either a <start> tag or an </end> tag
2251                                         $state = self::COLON_STATE_TAGSTART;
2252                                         break;
2253                                 case ":":
2254                                         if( $stack == 0 ) {
2255                                                 // We found it!
2256                                                 $before = substr( $str, 0, $i );
2257                                                 $after = substr( $str, $i + 1 );
2258                                                 wfProfileOut( $fname );
2259                                                 return $i;
2260                                         }
2261                                         // Embedded in a tag; don't break it.
2262                                         break;
2263                                 default:
2264                                         // Skip ahead looking for something interesting
2265                                         $colon = strpos( $str, ':', $i );
2266                                         if( $colon === false ) {
2267                                                 // Nothing else interesting
2268                                                 wfProfileOut( $fname );
2269                                                 return false;
2270                                         }
2271                                         $lt = strpos( $str, '<', $i );
2272                                         if( $stack === 0 ) {
2273                                                 if( $lt === false || $colon < $lt ) {
2274                                                         // We found it!
2275                                                         $before = substr( $str, 0, $colon );
2276                                                         $after = substr( $str, $colon + 1 );
2277                                                         wfProfileOut( $fname );
2278                                                         return $i;
2279                                                 }
2280                                         }
2281                                         if( $lt === false ) {
2282                                                 // Nothing else interesting to find; abort!
2283                                                 // We're nested, but there's no close tags left. Abort!
2284                                                 break 2;
2285                                         }
2286                                         // Skip ahead to next tag start
2287                                         $i = $lt;
2288                                         $state = self::COLON_STATE_TAGSTART;
2289                                 }
2290                                 break;
2291                         case 1: // self::COLON_STATE_TAG:
2292                                 // In a <tag>
2293                                 switch( $c ) {
2294                                 case ">":
2295                                         $stack++;
2296                                         $state = self::COLON_STATE_TEXT;
2297                                         break;
2298                                 case "/":
2299                                         // Slash may be followed by >?
2300                                         $state = self::COLON_STATE_TAGSLASH;
2301                                         break;
2302                                 default:
2303                                         // ignore
2304                                 }
2305                                 break;
2306                         case 2: // self::COLON_STATE_TAGSTART:
2307                                 switch( $c ) {
2308                                 case "/":
2309                                         $state = self::COLON_STATE_CLOSETAG;
2310                                         break;
2311                                 case "!":
2312                                         $state = self::COLON_STATE_COMMENT;
2313                                         break;
2314                                 case ">":
2315                                         // Illegal early close? This shouldn't happen D:
2316                                         $state = self::COLON_STATE_TEXT;
2317                                         break;
2318                                 default:
2319                                         $state = self::COLON_STATE_TAG;
2320                                 }
2321                                 break;
2322                         case 3: // self::COLON_STATE_CLOSETAG:
2323                                 // In a </tag>
2324                                 if( $c == ">" ) {
2325                                         $stack--;
2326                                         if( $stack < 0 ) {
2327                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2328                                                 wfProfileOut( $fname );
2329                                                 return false;
2330                                         }
2331                                         $state = self::COLON_STATE_TEXT;
2332                                 }
2333                                 break;
2334                         case self::COLON_STATE_TAGSLASH:
2335                                 if( $c == ">" ) {
2336                                         // Yes, a self-closed tag <blah/>
2337                                         $state = self::COLON_STATE_TEXT;
2338                                 } else {
2339                                         // Probably we're jumping the gun, and this is an attribute
2340                                         $state = self::COLON_STATE_TAG;
2341                                 }
2342                                 break;
2343                         case 5: // self::COLON_STATE_COMMENT:
2344                                 if( $c == "-" ) {
2345                                         $state = self::COLON_STATE_COMMENTDASH;
2346                                 }
2347                                 break;
2348                         case self::COLON_STATE_COMMENTDASH:
2349                                 if( $c == "-" ) {
2350                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2351                                 } else {
2352                                         $state = self::COLON_STATE_COMMENT;
2353                                 }
2354                                 break;
2355                         case self::COLON_STATE_COMMENTDASHDASH:
2356                                 if( $c == ">" ) {
2357                                         $state = self::COLON_STATE_TEXT;
2358                                 } else {
2359                                         $state = self::COLON_STATE_COMMENT;
2360                                 }
2361                                 break;
2362                         default:
2363                                 throw new MWException( "State machine error in $fname" );
2364                         }
2365                 }
2366                 if( $stack > 0 ) {
2367                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2368                         return false;
2369                 }
2370                 wfProfileOut( $fname );
2371                 return false;
2372         }
2373
2374         /**
2375          * Return value of a magic variable (like PAGENAME)
2376          *
2377          * @private
2378          */
2379         function getVariableValue( $index ) {
2380                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2381
2382                 /**
2383                  * Some of these require message or data lookups and can be
2384                  * expensive to check many times.
2385                  */
2386                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2387                         if ( isset( $this->mVarCache[$index] ) ) {
2388                                 return $this->mVarCache[$index];
2389                         }
2390                 }
2391
2392                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2393                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2394
2395                 # Use the time zone
2396                 global $wgLocaltimezone;
2397                 if ( isset( $wgLocaltimezone ) ) {
2398                         $oldtz = getenv( 'TZ' );
2399                         putenv( 'TZ='.$wgLocaltimezone );
2400                 }
2401
2402                 wfSuppressWarnings(); // E_STRICT system time bitching
2403                 $localTimestamp = date( 'YmdHis', $ts );
2404                 $localMonth = date( 'm', $ts );
2405                 $localMonthName = date( 'n', $ts );
2406                 $localDay = date( 'j', $ts );
2407                 $localDay2 = date( 'd', $ts );
2408                 $localDayOfWeek = date( 'w', $ts );
2409                 $localWeek = date( 'W', $ts );
2410                 $localYear = date( 'Y', $ts );
2411                 $localHour = date( 'H', $ts );
2412                 if ( isset( $wgLocaltimezone ) ) {
2413                         putenv( 'TZ='.$oldtz );
2414                 }
2415                 wfRestoreWarnings();
2416
2417                 switch ( $index ) {
2418                         case 'currentmonth':
2419                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2420                         case 'currentmonthname':
2421                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2422                         case 'currentmonthnamegen':
2423                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2424                         case 'currentmonthabbrev':
2425                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2426                         case 'currentday':
2427                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2428                         case 'currentday2':
2429                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2430                         case 'localmonth':
2431                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth );
2432                         case 'localmonthname':
2433                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( $localMonthName );
2434                         case 'localmonthnamegen':
2435                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2436                         case 'localmonthabbrev':
2437                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2438                         case 'localday':
2439                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay );
2440                         case 'localday2':
2441                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay2 );
2442                         case 'pagename':
2443                                 return wfEscapeWikiText( $this->mTitle->getText() );
2444                         case 'pagenamee':
2445                                 return $this->mTitle->getPartialURL();
2446                         case 'fullpagename':
2447                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2448                         case 'fullpagenamee':
2449                                 return $this->mTitle->getPrefixedURL();
2450                         case 'subpagename':
2451                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2452                         case 'subpagenamee':
2453                                 return $this->mTitle->getSubpageUrlForm();
2454                         case 'basepagename':
2455                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2456                         case 'basepagenamee':
2457                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2458                         case 'talkpagename':
2459                                 if( $this->mTitle->canTalk() ) {
2460                                         $talkPage = $this->mTitle->getTalkPage();
2461                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2462                                 } else {
2463                                         return '';
2464                                 }
2465                         case 'talkpagenamee':
2466                                 if( $this->mTitle->canTalk() ) {
2467                                         $talkPage = $this->mTitle->getTalkPage();
2468                                         return $talkPage->getPrefixedUrl();
2469                                 } else {
2470                                         return '';
2471                                 }
2472                         case 'subjectpagename':
2473                                 $subjPage = $this->mTitle->getSubjectPage();
2474                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2475                         case 'subjectpagenamee':
2476                                 $subjPage = $this->mTitle->getSubjectPage();
2477                                 return $subjPage->getPrefixedUrl();
2478                         case 'revisionid':
2479                                 // Let the edit saving system know we should parse the page
2480                                 // *after* a revision ID has been assigned.
2481                                 $this->mOutput->setFlag( 'vary-revision' );
2482                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2483                                 return $this->mRevisionId;
2484                         case 'revisionday':
2485                                 // Let the edit saving system know we should parse the page
2486                                 // *after* a revision ID has been assigned. This is for null edits.
2487                                 $this->mOutput->setFlag( 'vary-revision' );
2488                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2489                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2490                         case 'revisionday2':
2491                                 // Let the edit saving system know we should parse the page
2492                                 // *after* a revision ID has been assigned. This is for null edits.
2493                                 $this->mOutput->setFlag( 'vary-revision' );
2494                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2495                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2496                         case 'revisionmonth':
2497                                 // Let the edit saving system know we should parse the page
2498                                 // *after* a revision ID has been assigned. This is for null edits.
2499                                 $this->mOutput->setFlag( 'vary-revision' );
2500                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2501                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2502                         case 'revisionyear':
2503                                 // Let the edit saving system know we should parse the page
2504                                 // *after* a revision ID has been assigned. This is for null edits.
2505                                 $this->mOutput->setFlag( 'vary-revision' );
2506                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2507                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2508                         case 'revisiontimestamp':
2509                                 // Let the edit saving system know we should parse the page
2510                                 // *after* a revision ID has been assigned. This is for null edits.
2511                                 $this->mOutput->setFlag( 'vary-revision' );
2512                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2513                                 return $this->getRevisionTimestamp();
2514                         case 'namespace':
2515                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2516                         case 'namespacee':
2517                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2518                         case 'talkspace':
2519                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2520                         case 'talkspacee':
2521                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2522                         case 'subjectspace':
2523                                 return $this->mTitle->getSubjectNsText();
2524                         case 'subjectspacee':
2525                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2526                         case 'currentdayname':
2527                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2528                         case 'currentyear':
2529                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2530                         case 'currenttime':
2531                                 return $this->mVarCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2532                         case 'currenthour':
2533                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2534                         case 'currentweek':
2535                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2536                                 // int to remove the padding
2537                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2538                         case 'currentdow':
2539                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2540                         case 'localdayname':
2541                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2542                         case 'localyear':
2543                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localYear, true );
2544                         case 'localtime':
2545                                 return $this->mVarCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2546                         case 'localhour':
2547                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localHour, true );
2548                         case 'localweek':
2549                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2550                                 // int to remove the padding
2551                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2552                         case 'localdow':
2553                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2554                         case 'numberofarticles':
2555                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2556                         case 'numberoffiles':
2557                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2558                         case 'numberofusers':
2559                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2560                         case 'numberofpages':
2561                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2562                         case 'numberofadmins':
2563                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::admins() );
2564                         case 'numberofedits':
2565                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2566                         case 'currenttimestamp':
2567                                 return $this->mVarCache[$index] = wfTimestamp( TS_MW, $ts );
2568                         case 'localtimestamp':
2569                                 return $this->mVarCache[$index] = $localTimestamp;
2570                         case 'currentversion':
2571                                 return $this->mVarCache[$index] = SpecialVersion::getVersion();
2572                         case 'sitename':
2573                                 return $wgSitename;
2574                         case 'server':
2575                                 return $wgServer;
2576                         case 'servername':
2577                                 return $wgServerName;
2578                         case 'scriptpath':
2579                                 return $wgScriptPath;
2580                         case 'directionmark':
2581                                 return $wgContLang->getDirMark();
2582                         case 'contentlanguage':
2583                                 global $wgContLanguageCode;
2584                                 return $wgContLanguageCode;
2585                         default:
2586                                 $ret = null;
2587                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret ) ) )
2588                                         return $ret;
2589                                 else
2590                                         return null;
2591                 }
2592         }
2593
2594         /**
2595          * initialise the magic variables (like CURRENTMONTHNAME)
2596          *
2597          * @private
2598          */
2599         function initialiseVariables() {
2600                 $fname = 'Parser::initialiseVariables';
2601                 wfProfileIn( $fname );
2602                 $variableIDs = MagicWord::getVariableIDs();
2603
2604                 $this->mVariables = new MagicWordArray( $variableIDs );
2605                 wfProfileOut( $fname );
2606         }
2607
2608         /**
2609          * Preprocess some wikitext and return the document tree.
2610          * This is the ghost of replace_variables().
2611          *
2612          * @param string $text The text to parse
2613          * @param integer flags Bitwise combination of:
2614          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2615          *                                     included. Default is to assume a direct page view.
2616          *
2617          * The generated DOM tree must depend only on the input text and the flags.
2618          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2619          *
2620          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2621          * change in the DOM tree for a given text, must be passed through the section identifier
2622          * in the section edit link and thus back to extractSections().
2623          *
2624          * The output of this function is currently only cached in process memory, but a persistent
2625          * cache may be implemented at a later date which takes further advantage of these strict
2626          * dependency requirements.
2627          *
2628          * @private
2629          */
2630         function preprocessToDom ( $text, $flags = 0 ) {
2631                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2632                 return $dom;
2633         }
2634
2635         /*
2636          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2637          */
2638         public static function splitWhitespace( $s ) {
2639                 $ltrimmed = ltrim( $s );
2640                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2641                 $trimmed = rtrim( $ltrimmed );
2642                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2643                 if ( $diff > 0 ) {
2644                         $w2 = substr( $ltrimmed, -$diff );
2645                 } else {
2646                         $w2 = '';
2647                 }
2648                 return array( $w1, $trimmed, $w2 );
2649         }
2650
2651         /**
2652          * Replace magic variables, templates, and template arguments
2653          * with the appropriate text. Templates are substituted recursively,
2654          * taking care to avoid infinite loops.
2655          *
2656          * Note that the substitution depends on value of $mOutputType:
2657          *  self::OT_WIKI: only {{subst:}} templates
2658          *  self::OT_PREPROCESS: templates but not extension tags
2659          *  self::OT_HTML: all templates and extension tags
2660          *
2661          * @param string $tex The text to transform
2662          * @param PPFrame $frame Object describing the arguments passed to the template
2663          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2664          * @private
2665          */
2666         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2667                 # Prevent too big inclusions
2668                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2669                         return $text;
2670                 }
2671
2672                 $fname = __METHOD__;
2673                 wfProfileIn( $fname );
2674
2675                 if ( $frame === false ) {
2676                         $frame = $this->getPreprocessor()->newFrame();
2677                 } elseif ( !( $frame instanceof PPFrame ) ) {
2678                         throw new MWException( __METHOD__ . ' called using the old argument format' );
2679                 }
2680
2681                 $dom = $this->preprocessToDom( $text );
2682                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2683                 $text = $frame->expand( $dom, $flags );
2684
2685                 wfProfileOut( $fname );
2686                 return $text;
2687         }
2688
2689         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2690         static function createAssocArgs( $args ) {
2691                 $assocArgs = array();
2692                 $index = 1;
2693                 foreach( $args as $arg ) {
2694                         $eqpos = strpos( $arg, '=' );
2695                         if ( $eqpos === false ) {
2696                                 $assocArgs[$index++] = $arg;
2697                         } else {
2698                                 $name = trim( substr( $arg, 0, $eqpos ) );
2699                                 $value = trim( substr( $arg, $eqpos+1 ) );
2700                                 if ( $value === false ) {
2701                                         $value = '';
2702                                 }
2703                                 if ( $name !== false ) {
2704                                         $assocArgs[$name] = $value;
2705                                 }
2706                         }
2707                 }
2708
2709                 return $assocArgs;
2710         }
2711
2712         /**
2713          * Return the text of a template, after recursively
2714          * replacing any variables or templates within the template.
2715          *
2716          * @param array $piece The parts of the template
2717          *  $piece['title']: the title, i.e. the part before the |
2718          *  $piece['parts']: the parameter array
2719          *  $piece['lineStart']: whether the brace was at the start of a line
2720          * @param PPFrame The current frame, contains template arguments
2721          * @return string the text of the template
2722          * @private
2723          */
2724         function braceSubstitution( $piece, $frame ) {
2725                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2726                 $fname = __METHOD__;
2727                 wfProfileIn( $fname );
2728                 wfProfileIn( __METHOD__.'-setup' );
2729
2730                 # Flags
2731                 $found = false;             # $text has been filled
2732                 $nowiki = false;            # wiki markup in $text should be escaped
2733                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2734                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2735                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2736                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2737
2738                 # Title object, where $text came from
2739                 $title = NULL;
2740
2741                 # $part1 is the bit before the first |, and must contain only title characters.
2742                 # Various prefixes will be stripped from it later.
2743                 $titleWithSpaces = $frame->expand( $piece['title'] );
2744                 $part1 = trim( $titleWithSpaces );
2745                 $titleText = false;
2746
2747                 # Original title text preserved for various purposes
2748                 $originalTitle = $part1;
2749
2750                 # $args is a list of argument nodes, starting from index 0, not including $part1
2751                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2752                 wfProfileOut( __METHOD__.'-setup' );
2753
2754                 # SUBST
2755                 wfProfileIn( __METHOD__.'-modifiers' );
2756                 if ( !$found ) {
2757                         $mwSubst =& MagicWord::get( 'subst' );
2758                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2759                                 # One of two possibilities is true:
2760                                 # 1) Found SUBST but not in the PST phase
2761                                 # 2) Didn't find SUBST and in the PST phase
2762                                 # In either case, return without further processing
2763                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2764                                 $isLocalObj = true;
2765                                 $found = true;
2766                         }
2767                 }
2768
2769                 # Variables
2770                 if ( !$found && $args->getLength() == 0 ) {
2771                         $id = $this->mVariables->matchStartToEnd( $part1 );
2772                         if ( $id !== false ) {
2773                                 $text = $this->getVariableValue( $id );
2774                                 if (MagicWord::getCacheTTL($id)>-1)
2775                                         $this->mOutput->mContainsOldMagic = true;
2776                                 $found = true;
2777                         }
2778                 }
2779
2780                 # MSG, MSGNW and RAW
2781                 if ( !$found ) {
2782                         # Check for MSGNW:
2783                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2784                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2785                                 $nowiki = true;
2786                         } else {
2787                                 # Remove obsolete MSG:
2788                                 $mwMsg =& MagicWord::get( 'msg' );
2789                                 $mwMsg->matchStartAndRemove( $part1 );
2790                         }
2791
2792                         # Check for RAW:
2793                         $mwRaw =& MagicWord::get( 'raw' );
2794                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2795                                 $forceRawInterwiki = true;
2796                         }
2797                 }
2798                 wfProfileOut( __METHOD__.'-modifiers' );
2799
2800                 # Parser functions
2801                 if ( !$found ) {
2802                         wfProfileIn( __METHOD__ . '-pfunc' );
2803
2804                         $colonPos = strpos( $part1, ':' );
2805                         if ( $colonPos !== false ) {
2806                                 # Case sensitive functions
2807                                 $function = substr( $part1, 0, $colonPos );
2808                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2809                                         $function = $this->mFunctionSynonyms[1][$function];
2810                                 } else {
2811                                         # Case insensitive functions
2812                                         $function = strtolower( $function );
2813                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2814                                                 $function = $this->mFunctionSynonyms[0][$function];
2815                                         } else {
2816                                                 $function = false;
2817                                         }
2818                                 }
2819                                 if ( $function ) {
2820                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2821                                         $initialArgs = array( &$this );
2822                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2823                                         if ( $flags & SFH_OBJECT_ARGS ) {
2824                                                 # Add a frame parameter, and pass the arguments as an array
2825                                                 $allArgs = $initialArgs;
2826                                                 $allArgs[] = $frame;
2827                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2828                                                         $funcArgs[] = $args->item( $i );
2829                                                 }
2830                                                 $allArgs[] = $funcArgs;
2831                                         } else {
2832                                                 # Convert arguments to plain text
2833                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2834                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2835                                                 }
2836                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2837                                         }
2838
2839                                         # Workaround for PHP bug 35229 and similar
2840                                         if ( !is_callable( $callback ) ) {
2841                                                 throw new MWException( "Tag hook for $name is not callable\n" );
2842                                         }
2843                                         $result = call_user_func_array( $callback, $allArgs );
2844                                         $found = true;
2845
2846                                         if ( is_array( $result ) ) {
2847                                                 if ( isset( $result[0] ) ) {
2848                                                         $text = $result[0];
2849                                                         unset( $result[0] );
2850                                                 }
2851
2852                                                 // Extract flags into the local scope
2853                                                 // This allows callers to set flags such as nowiki, found, etc.
2854                                                 extract( $result );
2855                                         } else {
2856                                                 $text = $result;
2857                                         }
2858                                 }
2859                         }
2860                         wfProfileOut( __METHOD__ . '-pfunc' );
2861                 }
2862
2863                 # Finish mangling title and then check for loops.
2864                 # Set $title to a Title object and $titleText to the PDBK
2865                 if ( !$found ) {
2866                         $ns = NS_TEMPLATE;
2867                         # Split the title into page and subpage
2868                         $subpage = '';
2869                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2870                         if ($subpage !== '') {
2871                                 $ns = $this->mTitle->getNamespace();
2872                         }
2873                         $title = Title::newFromText( $part1, $ns );
2874                         if ( $title ) {
2875                                 $titleText = $title->getPrefixedText();
2876                                 # Check for language variants if the template is not found
2877                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2878                                         $wgContLang->findVariantLink($part1, $title);
2879                                 }
2880                                 # Do infinite loop check
2881                                 if ( !$frame->loopCheck( $title ) ) {
2882                                         $found = true;
2883                                         $text = "<span class=\"error\">Template loop detected: [[$titleText]]</span>";
2884                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2885                                 }
2886                                 # Do recursion depth check
2887                                 $limit = $this->mOptions->getMaxTemplateDepth();
2888                                 if ( $frame->depth >= $limit ) {
2889                                         $found = true;
2890                                         $text = "<span class=\"error\">Template recursion depth limit exceeded ($limit)</span>";
2891                                 }
2892                         }
2893                 }
2894
2895                 # Load from database
2896                 if ( !$found && $title ) {
2897                         wfProfileIn( __METHOD__ . '-loadtpl' );
2898                         if ( !$title->isExternal() ) {
2899                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2900                                         $text = SpecialPage::capturePath( $title );
2901                                         if ( is_string( $text ) ) {
2902                                                 $found = true;
2903                                                 $isHTML = true;
2904                                                 $this->disableCache();
2905                                         }
2906                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2907                                         $found = false; //access denied
2908                                         wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
2909                                 } else {
2910                                         list( $text, $title ) = $this->getTemplateDom( $title );
2911                                         if ( $text !== false ) {
2912                                                 $found = true;
2913                                                 $isChildObj = true;
2914                                         }
2915                                 }
2916
2917                                 # If the title is valid but undisplayable, make a link to it
2918                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2919                                         $text = "[[:$titleText]]";
2920                                         $found = true;
2921                                 }
2922                         } elseif ( $title->isTrans() ) {
2923                                 // Interwiki transclusion
2924                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2925                                         $text = $this->interwikiTransclude( $title, 'render' );
2926                                         $isHTML = true;
2927                                 } else {
2928                                         $text = $this->interwikiTransclude( $title, 'raw' );
2929                                         // Preprocess it like a template
2930                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2931                                         $isChildObj = true;
2932                                 }
2933                                 $found = true;
2934                         }
2935                         wfProfileOut( __METHOD__ . '-loadtpl' );
2936                 }
2937
2938                 # If we haven't found text to substitute by now, we're done
2939                 # Recover the source wikitext and return it
2940                 if ( !$found ) {
2941                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2942                         wfProfileOut( $fname );
2943                         return array( 'object' => $text );
2944                 }
2945
2946                 # Expand DOM-style return values in a child frame
2947                 if ( $isChildObj ) {
2948                         # Clean up argument array
2949                         $newFrame = $frame->newChild( $args, $title );
2950
2951                         if ( $nowiki ) {
2952                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
2953                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
2954                                 # Expansion is eligible for the empty-frame cache
2955                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
2956                                         $text = $this->mTplExpandCache[$titleText];
2957                                 } else {
2958                                         $text = $newFrame->expand( $text );
2959                                         $this->mTplExpandCache[$titleText] = $text;
2960                                 }
2961                         } else {
2962                                 # Uncached expansion
2963                                 $text = $newFrame->expand( $text );
2964                         }
2965                 }
2966                 if ( $isLocalObj && $nowiki ) {
2967                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
2968                         $isLocalObj = false;
2969                 }
2970
2971                 # Replace raw HTML by a placeholder
2972                 # Add a blank line preceding, to prevent it from mucking up
2973                 # immediately preceding headings
2974                 if ( $isHTML ) {
2975                         $text = "\n\n" . $this->insertStripItem( $text );
2976                 }
2977                 # Escape nowiki-style return values
2978                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2979                         $text = wfEscapeWikiText( $text );
2980                 }
2981                 # Bug 529: if the template begins with a table or block-level
2982                 # element, it should be treated as beginning a new line.
2983                 # This behaviour is somewhat controversial.
2984                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
2985                         $text = "\n" . $text;
2986                 }
2987
2988                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
2989                         # Error, oversize inclusion
2990                         $text = "[[$originalTitle]]" .
2991                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
2992                 }
2993
2994                 if ( $isLocalObj ) {
2995                         $ret = array( 'object' => $text );
2996                 } else {
2997                         $ret = array( 'text' => $text );
2998                 }
2999
3000                 wfProfileOut( $fname );
3001                 return $ret;
3002         }
3003
3004         /**
3005          * Get the semi-parsed DOM representation of a template with a given title,
3006          * and its redirect destination title. Cached.
3007          */
3008         function getTemplateDom( $title ) {
3009                 $cacheTitle = $title;
3010                 $titleText = $title->getPrefixedDBkey();
3011
3012                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3013                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3014                         $title = Title::makeTitle( $ns, $dbk );
3015                         $titleText = $title->getPrefixedDBkey();
3016                 }
3017                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3018                         return array( $this->mTplDomCache[$titleText], $title );
3019                 }
3020
3021                 // Cache miss, go to the database
3022                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3023
3024                 if ( $text === false ) {
3025                         $this->mTplDomCache[$titleText] = false;
3026                         return array( false, $title );
3027                 }
3028
3029                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3030                 $this->mTplDomCache[ $titleText ] = $dom;
3031
3032                 if (! $title->equals($cacheTitle)) {
3033                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3034                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3035                 }
3036
3037                 return array( $dom, $title );
3038         }
3039
3040         /**
3041          * Fetch the unparsed text of a template and register a reference to it.
3042          */
3043         function fetchTemplateAndTitle( $title ) {
3044                 $templateCb = $this->mOptions->getTemplateCallback();
3045                 $stuff = call_user_func( $templateCb, $title );
3046                 $text = $stuff['text'];
3047                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3048                 if ( isset( $stuff['deps'] ) ) {
3049                         foreach ( $stuff['deps'] as $dep ) {
3050                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3051                         }
3052                 }
3053                 return array($text,$finalTitle);
3054         }
3055
3056         function fetchTemplate( $title ) {
3057                 $rv = $this->fetchTemplateAndTitle($title);
3058                 return $rv[0];
3059         }
3060
3061         /**
3062          * Static function to get a template
3063          * Can be overridden via ParserOptions::setTemplateCallback().
3064          */
3065         static function statelessFetchTemplate( $title ) {
3066                 $text = $skip = false;
3067                 $finalTitle = $title;
3068                 $deps = array();
3069
3070                 // Loop to fetch the article, with up to 1 redirect
3071                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3072                         # Give extensions a chance to select the revision instead
3073                         $id = false; // Assume current
3074                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3075
3076                         if( $skip ) {
3077                                 $text = false;
3078                                 $deps[] = array(
3079                                         'title' => $title,
3080                                         'page_id' => $title->getArticleID(),
3081                                         'rev_id' => null );
3082                                 break;
3083                         }
3084                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3085                         $rev_id = $rev ? $rev->getId() : 0;
3086
3087                         $deps[] = array(
3088                                 'title' => $title,
3089                                 'page_id' => $title->getArticleID(),
3090                                 'rev_id' => $rev_id );
3091
3092                         if( $rev ) {
3093                                 $text = $rev->getText();
3094                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3095                                 global $wgLang;
3096                                 $message = $wgLang->lcfirst( $title->getText() );
3097                                 $text = wfMsgForContentNoTrans( $message );
3098                                 if( wfEmptyMsg( $message, $text ) ) {
3099                                         $text = false;
3100                                         break;
3101                                 }
3102                         } else {
3103                                 break;
3104                         }
3105                         if ( $text === false ) {
3106                                 break;
3107                         }
3108                         // Redirect?
3109                         $finalTitle = $title;
3110                         $title = Title::newFromRedirect( $text );
3111                 }
3112                 return array(
3113                         'text' => $text,
3114                         'finalTitle' => $finalTitle,
3115                         'deps' => $deps );
3116         }
3117
3118         /**
3119          * Transclude an interwiki link.
3120          */
3121         function interwikiTransclude( $title, $action ) {
3122                 global $wgEnableScaryTranscluding;
3123
3124                 if (!$wgEnableScaryTranscluding)
3125                         return wfMsg('scarytranscludedisabled');
3126
3127                 $url = $title->getFullUrl( "action=$action" );
3128
3129                 if (strlen($url) > 255)
3130                         return wfMsg('scarytranscludetoolong');
3131                 return $this->fetchScaryTemplateMaybeFromCache($url);
3132         }
3133
3134         function fetchScaryTemplateMaybeFromCache($url) {
3135                 global $wgTranscludeCacheExpiry;
3136                 $dbr = wfGetDB(DB_SLAVE);
3137                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3138                                 array('tc_url' => $url));
3139                 if ($obj) {
3140                         $time = $obj->tc_time;
3141                         $text = $obj->tc_contents;
3142                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3143                                 return $text;
3144                         }
3145                 }
3146
3147                 $text = Http::get($url);
3148                 if (!$text)
3149                         return wfMsg('scarytranscludefailed', $url);
3150
3151                 $dbw = wfGetDB(DB_MASTER);
3152                 $dbw->replace('transcache', array('tc_url'), array(
3153                         'tc_url' => $url,
3154                         'tc_time' => time(),
3155                         'tc_contents' => $text));
3156                 return $text;
3157         }
3158
3159
3160         /**
3161          * Triple brace replacement -- used for template arguments
3162          * @private
3163          */
3164         function argSubstitution( $piece, $frame ) {
3165                 wfProfileIn( __METHOD__ );
3166
3167                 $error = false;
3168                 $parts = $piece['parts'];
3169                 $nameWithSpaces = $frame->expand( $piece['title'] );
3170                 $argName = trim( $nameWithSpaces );
3171                 $object = false;
3172                 $text = $frame->getArgument( $argName );
3173                 if (  $text === false && $parts->getLength() > 0
3174                   && (
3175                     $this->ot['html']
3176                     || $this->ot['pre']
3177                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3178                   )
3179                 ) {
3180                         # No match in frame, use the supplied default
3181                         $object = $parts->item( 0 )->getChildren();
3182                 }
3183                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3184                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3185                 }
3186
3187                 if ( $text === false && $object === false ) {
3188                         # No match anywhere
3189                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3190                 }
3191                 if ( $error !== false ) {
3192                         $text .= $error;
3193                 }
3194                 if ( $object !== false ) {
3195                         $ret = array( 'object' => $object );
3196                 } else {
3197                         $ret = array( 'text' => $text );
3198                 }
3199
3200                 wfProfileOut( __METHOD__ );
3201                 return $ret;
3202         }
3203
3204         /**
3205          * Return the text to be used for a given extension tag.
3206          * This is the ghost of strip().
3207          *
3208          * @param array $params Associative array of parameters:
3209          *     name       PPNode for the tag name
3210          *     attr       PPNode for unparsed text where tag attributes are thought to be
3211          *     attributes Optional associative array of parsed attributes
3212          *     inner      Contents of extension element
3213          *     noClose    Original text did not have a close tag
3214          * @param PPFrame $frame
3215          */
3216         function extensionSubstitution( $params, $frame ) {
3217                 global $wgRawHtml, $wgContLang;
3218
3219                 $name = $frame->expand( $params['name'] );
3220                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3221                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3222
3223                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . $this->mMarkerSuffix;
3224
3225                 if ( $this->ot['html'] ) {
3226                         $name = strtolower( $name );
3227
3228                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3229                         if ( isset( $params['attributes'] ) ) {
3230                                 $attributes = $attributes + $params['attributes'];
3231                         }
3232                         switch ( $name ) {
3233                                 case 'html':
3234                                         if( $wgRawHtml ) {
3235                                                 $output = $content;
3236                                                 break;
3237                                         } else {
3238                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3239                                         }
3240                                 case 'nowiki':
3241                                         $output = Xml::escapeTagsOnly( $content );
3242                                         break;
3243                                 case 'math':
3244                                         $output = $wgContLang->armourMath(
3245                                                 MathRenderer::renderMath( $content, $attributes ) );
3246                                         break;
3247                                 case 'gallery':
3248                                         $output = $this->renderImageGallery( $content, $attributes );
3249                                         break;
3250                                 default:
3251                                         if( isset( $this->mTagHooks[$name] ) ) {
3252                                                 # Workaround for PHP bug 35229 and similar
3253                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3254                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3255                                                 }
3256                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3257                                                         array( $content, $attributes, $this ) );
3258                                         } else {
3259                                                 throw new MWException( "Invalid call hook $name" );
3260                                         }
3261                         }
3262                 } else {
3263                         if ( is_null( $attrText ) ) {
3264                                 $attrText = '';
3265                         }
3266                         if ( isset( $params['attributes'] ) ) {
3267                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3268                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3269                                                 htmlspecialchars( $attrValue ) . '"';
3270                                 }
3271                         }
3272                         if ( $content === null ) {
3273                                 $output = "<$name$attrText/>";
3274                         } else {
3275                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3276                                 $output = "<$name$attrText>$content$close";
3277                         }
3278                 }
3279
3280                 if ( $name == 'html' || $name == 'nowiki' ) {
3281                         $this->mStripState->nowiki->setPair( $marker, $output );
3282                 } else {
3283                         $this->mStripState->general->setPair( $marker, $output );
3284                 }
3285                 return $marker;
3286         }
3287
3288         /**
3289          * Increment an include size counter
3290          *
3291          * @param string $type The type of expansion
3292          * @param integer $size The size of the text
3293          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3294          */
3295         function incrementIncludeSize( $type, $size ) {
3296                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3297                         return false;
3298                 } else {
3299                         $this->mIncludeSizes[$type] += $size;
3300                         return true;
3301                 }
3302         }
3303
3304         /**
3305          * Detect __NOGALLERY__ magic word and set a placeholder
3306          */
3307         function stripNoGallery( &$text ) {
3308                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3309                 # do not add TOC
3310                 $mw = MagicWord::get( 'nogallery' );
3311                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3312         }
3313
3314         /**
3315          * Find the first __TOC__ magic word and set a <!--MWTOC-->
3316          * placeholder that will then be replaced by the real TOC in
3317          * ->formatHeadings, this works because at this points real
3318          * comments will have already been discarded by the sanitizer.
3319          *
3320          * Any additional __TOC__ magic words left over will be discarded
3321          * as there can only be one TOC on the page.
3322          */
3323         function stripToc( $text ) {
3324                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3325                 # do not add TOC
3326                 $mw = MagicWord::get( 'notoc' );
3327                 if( $mw->matchAndRemove( $text ) ) {
3328                         $this->mShowToc = false;
3329                 }
3330
3331                 $mw = MagicWord::get( 'toc' );
3332                 if( $mw->match( $text ) ) {
3333                         $this->mShowToc = true;
3334                         $this->mForceTocPosition = true;
3335
3336                         // Set a placeholder. At the end we'll fill it in with the TOC.
3337                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3338
3339                         // Only keep the first one.
3340                         $text = $mw->replace( '', $text );
3341                 }
3342                 return $text;
3343         }
3344
3345         /**
3346          * This function accomplishes several tasks:
3347          * 1) Auto-number headings if that option is enabled
3348          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3349          * 3) Add a Table of contents on the top for users who have enabled the option
3350          * 4) Auto-anchor headings
3351          *
3352          * It loops through all headlines, collects the necessary data, then splits up the
3353          * string and re-inserts the newly formatted headlines.
3354          *
3355          * @param string $text
3356          * @param boolean $isMain
3357          * @private
3358          */
3359         function formatHeadings( $text, $isMain=true ) {
3360                 global $wgMaxTocLevel, $wgContLang;
3361
3362                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3363                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3364                         $showEditLink = 0;
3365                 } else {
3366                         $showEditLink = $this->mOptions->getEditSection();
3367                 }
3368
3369                 # Inhibit editsection links if requested in the page
3370                 $esw =& MagicWord::get( 'noeditsection' );
3371                 if( $esw->matchAndRemove( $text ) ) {
3372                         $showEditLink = 0;
3373                 }
3374
3375                 # Get all headlines for numbering them and adding funky stuff like [edit]
3376                 # links - this is for later, but we need the number of headlines right now
3377                 $matches = array();
3378                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3379
3380                 # if there are fewer than 4 headlines in the article, do not show TOC
3381                 # unless it's been explicitly enabled.
3382                 $enoughToc = $this->mShowToc &&
3383                         (($numMatches >= 4) || $this->mForceTocPosition);
3384
3385                 # Allow user to stipulate that a page should have a "new section"
3386                 # link added via __NEWSECTIONLINK__
3387                 $mw =& MagicWord::get( 'newsectionlink' );
3388                 if( $mw->matchAndRemove( $text ) )
3389                         $this->mOutput->setNewSection( true );
3390
3391                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3392                 # override above conditions and always show TOC above first header
3393                 $mw =& MagicWord::get( 'forcetoc' );
3394                 if ($mw->matchAndRemove( $text ) ) {
3395                         $this->mShowToc = true;
3396                         $enoughToc = true;
3397                 }
3398
3399                 # We need this to perform operations on the HTML
3400                 $sk = $this->mOptions->getSkin();
3401
3402                 # headline counter
3403                 $headlineCount = 0;
3404                 $numVisible = 0;
3405
3406                 # Ugh .. the TOC should have neat indentation levels which can be
3407                 # passed to the skin functions. These are determined here
3408                 $toc = '';
3409                 $full = '';
3410                 $head = array();
3411                 $sublevelCount = array();
3412                 $levelCount = array();
3413                 $toclevel = 0;
3414                 $level = 0;
3415                 $prevlevel = 0;
3416                 $toclevel = 0;
3417                 $prevtoclevel = 0;
3418                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-{$this->mMarkerSuffix}";
3419                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3420                 $tocraw = array();
3421
3422                 foreach( $matches[3] as $headline ) {
3423                         $isTemplate = false;
3424                         $titleText = false;
3425                         $sectionIndex = false;
3426                         $numbering = '';
3427                         $markerMatches = array();
3428                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3429                                 $serial = $markerMatches[1];
3430                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3431                                 $isTemplate = ($titleText != $baseTitleText);
3432                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3433                         }
3434
3435                         if( $toclevel ) {
3436                                 $prevlevel = $level;
3437                                 $prevtoclevel = $toclevel;
3438                         }
3439                         $level = $matches[1][$headlineCount];
3440
3441                         if( $doNumberHeadings || $enoughToc ) {
3442
3443                                 if ( $level > $prevlevel ) {
3444                                         # Increase TOC level
3445                                         $toclevel++;
3446                                         $sublevelCount[$toclevel] = 0;
3447                                         if( $toclevel<$wgMaxTocLevel ) {
3448                                                 $prevtoclevel = $toclevel;
3449                                                 $toc .= $sk->tocIndent();
3450                                                 $numVisible++;
3451                                         }
3452                                 }
3453                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3454                                         # Decrease TOC level, find level to jump to
3455
3456                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3457                                                 # Can only go down to level 1
3458                                                 $toclevel = 1;
3459                                         } else {
3460                                                 for ($i = $toclevel; $i > 0; $i--) {
3461                                                         if ( $levelCount[$i] == $level ) {
3462                                                                 # Found last matching level
3463                                                                 $toclevel = $i;
3464                                                                 break;
3465                                                         }
3466                                                         elseif ( $levelCount[$i] < $level ) {
3467                                                                 # Found first matching level below current level
3468                                                                 $toclevel = $i + 1;
3469                                                                 break;
3470                                                         }
3471                                                 }
3472                                         }
3473                                         if( $toclevel<$wgMaxTocLevel ) {
3474                                                 if($prevtoclevel < $wgMaxTocLevel) {
3475                                                         # Unindent only if the previous toc level was shown :p
3476                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3477                                                 } else {
3478                                                         $toc .= $sk->tocLineEnd();
3479                                                 }
3480                                         }
3481                                 }
3482                                 else {
3483                                         # No change in level, end TOC line
3484                                         if( $toclevel<$wgMaxTocLevel ) {
3485                                                 $toc .= $sk->tocLineEnd();
3486                                         }
3487                                 }
3488
3489                                 $levelCount[$toclevel] = $level;
3490
3491                                 # count number of headlines for each level
3492                                 @$sublevelCount[$toclevel]++;
3493                                 $dot = 0;
3494                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3495                                         if( !empty( $sublevelCount[$i] ) ) {
3496                                                 if( $dot ) {
3497                                                         $numbering .= '.';
3498                                                 }
3499                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3500                                                 $dot = 1;
3501                                         }
3502                                 }
3503                         }
3504
3505                         # The safe header is a version of the header text safe to use for links
3506                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3507                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3508
3509                         # Remove link placeholders by the link text.
3510                         #     <!--LINK number-->
3511                         # turns into
3512                         #     link text with suffix
3513                         $safeHeadline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3514                                                             "\$this->mLinkHolders['texts'][\$1]",
3515                                                             $safeHeadline );
3516                         $safeHeadline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3517                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3518                                                             $safeHeadline );
3519
3520                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3521                         $tocline = preg_replace(
3522                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3523                                 array( '',                          '<$1>'),
3524                                 $safeHeadline
3525                         );
3526                         $tocline = trim( $tocline );
3527
3528                         # For the anchor, strip out HTML-y stuff period
3529                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3530                         $safeHeadline = trim( $safeHeadline );
3531
3532                         # Save headline for section edit hint before it's escaped
3533                         $headlineHint = $safeHeadline;
3534                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3535                         $refers[$headlineCount] = $safeHeadline;
3536
3537                         # count how many in assoc. array so we can track dupes in anchors
3538                         isset( $refers[$safeHeadline] ) ? $refers[$safeHeadline]++ : $refers[$safeHeadline] = 1;
3539                         $refcount[$headlineCount] = $refers[$safeHeadline];
3540
3541                         # Don't number the heading if it is the only one (looks silly)
3542                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3543                                 # the two are different if the line contains a link
3544                                 $headline=$numbering . ' ' . $headline;
3545                         }
3546
3547                         # Create the anchor for linking from the TOC to the section
3548                         $anchor = $safeHeadline;
3549                         if($refcount[$headlineCount] > 1 ) {
3550                                 $anchor .= '_' . $refcount[$headlineCount];
3551                         }
3552                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3553                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3554                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3555                         }
3556                         # give headline the correct <h#> tag
3557                         if( $showEditLink && $sectionIndex !== false ) {
3558                                 if( $isTemplate ) {
3559                                         # Put a T flag in the section identifier, to indicate to extractSections()
3560                                         # that sections inside <includeonly> should be counted.
3561                                         $editlink = $sk->editSectionLinkForOther($titleText, "T-$sectionIndex");
3562                                 } else {
3563                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3564                                 }
3565                         } else {
3566                                 $editlink = '';
3567                         }
3568                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3569
3570                         $headlineCount++;
3571                 }
3572
3573                 $this->mOutput->setSections( $tocraw );
3574
3575                 # Never ever show TOC if no headers
3576                 if( $numVisible < 1 ) {
3577                         $enoughToc = false;
3578                 }
3579
3580                 if( $enoughToc ) {
3581                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3582                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3583                         }
3584                         $toc = $sk->tocList( $toc );
3585                 }
3586
3587                 # split up and insert constructed headlines
3588
3589                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3590                 $i = 0;
3591
3592                 foreach( $blocks as $block ) {
3593                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3594                                 # This is the [edit] link that appears for the top block of text when
3595                                 # section editing is enabled
3596
3597                                 # Disabled because it broke block formatting
3598                                 # For example, a bullet point in the top line
3599                                 # $full .= $sk->editSectionLink(0);
3600                         }
3601                         $full .= $block;
3602                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3603                                 # Top anchor now in skin
3604                                 $full = $full.$toc;
3605                         }
3606
3607                         if( !empty( $head[$i] ) ) {
3608                                 $full .= $head[$i];
3609                         }
3610                         $i++;
3611                 }
3612                 if( $this->mForceTocPosition ) {
3613                         return str_replace( '<!--MWTOC-->', $toc, $full );
3614                 } else {
3615                         return $full;
3616                 }
3617         }
3618
3619         /**
3620          * Transform wiki markup when saving a page by doing \r\n -> \n
3621          * conversion, substitting signatures, {{subst:}} templates, etc.
3622          *
3623          * @param string $text the text to transform
3624          * @param Title &$title the Title object for the current article
3625          * @param User &$user the User object describing the current user
3626          * @param ParserOptions $options parsing options
3627          * @param bool $clearState whether to clear the parser state first
3628          * @return string the altered wiki markup
3629          * @public
3630          */
3631         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3632                 $this->mOptions = $options;
3633                 $this->setTitle( $title );
3634                 $this->setOutputType( self::OT_WIKI );
3635
3636                 if ( $clearState ) {
3637                         $this->clearState();
3638                 }
3639
3640                 $pairs = array(
3641                         "\r\n" => "\n",
3642                 );
3643                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3644                 $text = $this->pstPass2( $text, $user );
3645                 $text = $this->mStripState->unstripBoth( $text );
3646                 return $text;
3647         }
3648
3649         /**
3650          * Pre-save transform helper function
3651          * @private
3652          */
3653         function pstPass2( $text, $user ) {
3654                 global $wgContLang, $wgLocaltimezone;
3655
3656                 /* Note: This is the timestamp saved as hardcoded wikitext to
3657                  * the database, we use $wgContLang here in order to give
3658                  * everyone the same signature and use the default one rather
3659                  * than the one selected in each user's preferences.
3660                  *
3661                  * (see also bug 12815)
3662                  */
3663                 $ts = $this->mOptions->getTimestamp();
3664                 $tz = 'UTC';
3665                 if ( isset( $wgLocaltimezone ) ) {
3666                         $unixts = wfTimestamp( TS_UNIX, $ts );
3667                         $oldtz = getenv( 'TZ' );
3668                         putenv( 'TZ='.$wgLocaltimezone );
3669                         $ts = date( 'YmdHis', $unixts );
3670                         $tz = date( 'T', $unixts );  # might vary on DST changeover!
3671                         putenv( 'TZ='.$oldtz );
3672                 }
3673                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tz)";
3674
3675                 # Variable replacement
3676                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3677                 $text = $this->replaceVariables( $text );
3678
3679                 # Signatures
3680                 $sigText = $this->getUserSig( $user );
3681                 $text = strtr( $text, array(
3682                         '~~~~~' => $d,
3683                         '~~~~' => "$sigText $d",
3684                         '~~~' => $sigText
3685                 ) );
3686
3687                 # Context links: [[|name]] and [[name (context)|]]
3688                 #
3689                 global $wgLegalTitleChars;
3690                 $tc = "[$wgLegalTitleChars]";
3691                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3692
3693                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3694                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3695                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3696
3697                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3698                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3699                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3700
3701                 $t = $this->mTitle->getText();
3702                 $m = array();
3703                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3704                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3705                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3706                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3707                 } else {
3708                         # if there's no context, don't bother duplicating the title
3709                         $text = preg_replace( $p2, '[[\\1]]', $text );
3710                 }
3711
3712                 # Trim trailing whitespace
3713                 $text = rtrim( $text );
3714
3715                 return $text;
3716         }
3717
3718         /**
3719          * Fetch the user's signature text, if any, and normalize to
3720          * validated, ready-to-insert wikitext.
3721          *
3722          * @param User $user
3723          * @return string
3724          * @private
3725          */
3726         function getUserSig( &$user ) {
3727                 global $wgMaxSigChars;
3728
3729                 $username = $user->getName();
3730                 $nickname = $user->getOption( 'nickname' );
3731                 $nickname = $nickname === '' ? $username : $nickname;
3732
3733                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3734                         $nickname = $username;
3735                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3736                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3737                         # Sig. might contain markup; validate this
3738                         if( $this->validateSig( $nickname ) !== false ) {
3739                                 # Validated; clean up (if needed) and return it
3740                                 return $this->cleanSig( $nickname, true );
3741                         } else {
3742                                 # Failed to validate; fall back to the default
3743                                 $nickname = $username;
3744                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3745                         }
3746                 }
3747
3748                 // Make sure nickname doesnt get a sig in a sig
3749                 $nickname = $this->cleanSigInSig( $nickname );
3750
3751                 # If we're still here, make it a link to the user page
3752                 $userText = wfEscapeWikiText( $username );
3753                 $nickText = wfEscapeWikiText( $nickname );
3754                 if ( $user->isAnon() )  {
3755                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3756                 } else {
3757                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3758                 }
3759         }
3760
3761         /**
3762          * Check that the user's signature contains no bad XML
3763          *
3764          * @param string $text
3765          * @return mixed An expanded string, or false if invalid.
3766          */
3767         function validateSig( $text ) {
3768                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3769         }
3770
3771         /**
3772          * Clean up signature text
3773          *
3774          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3775          * 2) Substitute all transclusions
3776          *
3777          * @param string $text
3778          * @param $parsing Whether we're cleaning (preferences save) or parsing
3779          * @return string Signature text
3780          */
3781         function cleanSig( $text, $parsing = false ) {
3782                 if ( !$parsing ) {
3783                         global $wgTitle;
3784                         $this->clearState();
3785                         $this->setTitle( $wgTitle );
3786                         $this->mOptions = new ParserOptions;
3787                         $this->setOutputType = self::OT_PREPROCESS;
3788                 }
3789
3790                 # FIXME: regex doesn't respect extension tags or nowiki
3791                 #  => Move this logic to braceSubstitution()
3792                 $substWord = MagicWord::get( 'subst' );
3793                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3794                 $substText = '{{' . $substWord->getSynonym( 0 );
3795
3796                 $text = preg_replace( $substRegex, $substText, $text );
3797                 $text = $this->cleanSigInSig( $text );
3798                 $dom = $this->preprocessToDom( $text );
3799                 $frame = $this->getPreprocessor()->newFrame();
3800                 $text = $frame->expand( $dom );
3801
3802                 if ( !$parsing ) {
3803                         $text = $this->mStripState->unstripBoth( $text );
3804                 }
3805
3806                 return $text;
3807         }
3808
3809         /**
3810          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3811          * @param string $text
3812          * @return string Signature text with /~{3,5}/ removed
3813          */
3814         function cleanSigInSig( $text ) {
3815                 $text = preg_replace( '/~{3,5}/', '', $text );
3816                 return $text;
3817         }
3818
3819         /**
3820          * Set up some variables which are usually set up in parse()
3821          * so that an external function can call some class members with confidence
3822          * @public
3823          */
3824         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3825                 $this->setTitle( $title );
3826                 $this->mOptions = $options;
3827                 $this->setOutputType( $outputType );
3828                 if ( $clearState ) {
3829                         $this->clearState();
3830                 }
3831         }
3832
3833         /**
3834          * Wrapper for preprocess()
3835          *
3836          * @param string $text the text to preprocess
3837          * @param ParserOptions $options  options
3838          * @return string
3839          * @public
3840          */
3841         function transformMsg( $text, $options ) {
3842                 global $wgTitle;
3843                 static $executing = false;
3844
3845                 $fname = "Parser::transformMsg";
3846
3847                 # Guard against infinite recursion
3848                 if ( $executing ) {
3849                         return $text;
3850                 }
3851                 $executing = true;
3852
3853                 wfProfileIn($fname);
3854                 $text = $this->preprocess( $text, $wgTitle, $options );
3855
3856                 $executing = false;
3857                 wfProfileOut($fname);
3858                 return $text;
3859         }
3860
3861         /**
3862          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3863          * The callback should have the following form:
3864          *    function myParserHook( $text, $params, &$parser ) { ... }
3865          *
3866          * Transform and return $text. Use $parser for any required context, e.g. use
3867          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3868          *
3869          * @public
3870          *
3871          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3872          * @param mixed $callback The callback function (and object) to use for the tag
3873          *
3874          * @return The old value of the mTagHooks array associated with the hook
3875          */
3876         function setHook( $tag, $callback ) {
3877                 $tag = strtolower( $tag );
3878                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3879                 $this->mTagHooks[$tag] = $callback;
3880                 $this->mStripList[] = $tag;
3881
3882                 return $oldVal;
3883         }
3884
3885         function setTransparentTagHook( $tag, $callback ) {
3886                 $tag = strtolower( $tag );
3887                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
3888                 $this->mTransparentTagHooks[$tag] = $callback;
3889
3890                 return $oldVal;
3891         }
3892
3893         /**
3894          * Remove all tag hooks
3895          */
3896         function clearTagHooks() {
3897                 $this->mTagHooks = array();
3898                 $this->mStripList = $this->mDefaultStripList;
3899         }
3900
3901         /**
3902          * Create a function, e.g. {{sum:1|2|3}}
3903          * The callback function should have the form:
3904          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3905          *
3906          * The callback may either return the text result of the function, or an array with the text
3907          * in element 0, and a number of flags in the other elements. The names of the flags are
3908          * specified in the keys. Valid flags are:
3909          *   found                     The text returned is valid, stop processing the template. This
3910          *                             is on by default.
3911          *   nowiki                    Wiki markup in the return value should be escaped
3912          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3913          *
3914          * @public
3915          *
3916          * @param string $id The magic word ID
3917          * @param mixed $callback The callback function (and object) to use
3918          * @param integer $flags a combination of the following flags:
3919          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3920          *
3921          * @return The old callback function for this name, if any
3922          */
3923         function setFunctionHook( $id, $callback, $flags = 0 ) {
3924                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
3925                 $this->mFunctionHooks[$id] = array( $callback, $flags );
3926
3927                 # Add to function cache
3928                 $mw = MagicWord::get( $id );
3929                 if( !$mw )
3930                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3931
3932                 $synonyms = $mw->getSynonyms();
3933                 $sensitive = intval( $mw->isCaseSensitive() );
3934
3935                 foreach ( $synonyms as $syn ) {
3936                         # Case
3937                         if ( !$sensitive ) {
3938                                 $syn = strtolower( $syn );
3939                         }
3940                         # Add leading hash
3941                         if ( !( $flags & SFH_NO_HASH ) ) {
3942                                 $syn = '#' . $syn;
3943                         }
3944                         # Remove trailing colon
3945                         if ( substr( $syn, -1, 1 ) == ':' ) {
3946                                 $syn = substr( $syn, 0, -1 );
3947                         }
3948                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3949                 }
3950                 return $oldVal;
3951         }
3952
3953         /**
3954          * Get all registered function hook identifiers
3955          *
3956          * @return array
3957          */
3958         function getFunctionHooks() {
3959                 return array_keys( $this->mFunctionHooks );
3960         }
3961
3962         /**
3963          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3964          * Placeholders created in Skin::makeLinkObj()
3965          * Returns an array of link CSS classes, indexed by PDBK.
3966          * $options is a bit field, RLH_FOR_UPDATE to select for update
3967          */
3968         function replaceLinkHolders( &$text, $options = 0 ) {
3969                 global $wgUser;
3970                 global $wgContLang;
3971
3972                 $fname = 'Parser::replaceLinkHolders';
3973                 wfProfileIn( $fname );
3974
3975                 $pdbks = array();
3976                 $colours = array();
3977                 $linkcolour_ids = array();
3978                 $sk = $this->mOptions->getSkin();
3979                 $linkCache =& LinkCache::singleton();
3980
3981                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3982                         wfProfileIn( $fname.'-check' );
3983                         $dbr = wfGetDB( DB_SLAVE );
3984                         $page = $dbr->tableName( 'page' );
3985                         $threshold = $wgUser->getOption('stubthreshold');
3986
3987                         # Sort by namespace
3988                         asort( $this->mLinkHolders['namespaces'] );
3989
3990                         # Generate query
3991                         $query = false;
3992                         $current = null;
3993                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3994                                 # Make title object
3995                                 $title = $this->mLinkHolders['titles'][$key];
3996
3997                                 # Skip invalid entries.
3998                                 # Result will be ugly, but prevents crash.
3999                                 if ( is_null( $title ) ) {
4000                                         continue;
4001                                 }
4002                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4003
4004                                 # Check if it's a static known link, e.g. interwiki
4005                                 if ( $title->isAlwaysKnown() ) {
4006                                         $colours[$pdbk] = '';
4007                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4008                                         $colours[$pdbk] = '';
4009                                         $this->mOutput->addLink( $title, $id );
4010                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4011                                         $colours[$pdbk] = 'new';
4012                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
4013                                         $colours[$pdbk] = 'new';
4014                                 } else {
4015                                         # Not in the link cache, add it to the query
4016                                         if ( !isset( $current ) ) {
4017                                                 $current = $ns;
4018                                                 $query =  "SELECT page_id, page_namespace, page_title, page_is_redirect";
4019                                                 if ( $threshold > 0 ) {
4020                                                         $query .= ', page_len';
4021                                                 }
4022                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4023                                         } elseif ( $current != $ns ) {
4024                                                 $current = $ns;
4025                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4026                                         } else {
4027                                                 $query .= ', ';
4028                                         }
4029
4030                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4031                                 }
4032                         }
4033                         if ( $query ) {
4034                                 $query .= '))';
4035                                 if ( $options & RLH_FOR_UPDATE ) {
4036                                         $query .= ' FOR UPDATE';
4037                                 }
4038
4039                                 $res = $dbr->query( $query, $fname );
4040
4041                                 # Fetch data and form into an associative array
4042                                 # non-existent = broken
4043                                 while ( $s = $dbr->fetchObject($res) ) {
4044                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4045                                         $pdbk = $title->getPrefixedDBkey();
4046                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4047                                         $this->mOutput->addLink( $title, $s->page_id );
4048                                         $colours[$pdbk] = $sk->getLinkColour( $s, $threshold );
4049                                         //add id to the extension todolist
4050                                         $linkcolour_ids[$s->page_id] = $pdbk;
4051                                 }
4052                                 //pass an array of page_ids to an extension
4053                                 wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4054                         }
4055                         wfProfileOut( $fname.'-check' );
4056
4057                         # Do a second query for different language variants of links and categories
4058                         if($wgContLang->hasVariants()){
4059                                 $linkBatch = new LinkBatch();
4060                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4061                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4062                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4063
4064                                 $categories = $this->mOutput->getCategoryLinks();
4065
4066                                 // Add variants of links to link batch
4067                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4068                                         $title = $this->mLinkHolders['titles'][$key];
4069                                         if ( is_null( $title ) )
4070                                                 continue;
4071
4072                                         $pdbk = $title->getPrefixedDBkey();
4073                                         $titleText = $title->getText();
4074
4075                                         // generate all variants of the link title text
4076                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4077
4078                                         // if link was not found (in first query), add all variants to query
4079                                         if ( !isset($colours[$pdbk]) ){
4080                                                 foreach($allTextVariants as $textVariant){
4081                                                         if($textVariant != $titleText){
4082                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4083                                                                 if(is_null($variantTitle)) continue;
4084                                                                 $linkBatch->addObj( $variantTitle );
4085                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4086                                                         }
4087                                                 }
4088                                         }
4089                                 }
4090
4091                                 // process categories, check if a category exists in some variant
4092                                 foreach( $categories as $category ){
4093                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4094                                         foreach($variants as $variant){
4095                                                 if($variant != $category){
4096                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4097                                                         if(is_null($variantTitle)) continue;
4098                                                         $linkBatch->addObj( $variantTitle );
4099                                                         $categoryMap[$variant] = $category;
4100                                                 }
4101                                         }
4102                                 }
4103
4104
4105                                 if(!$linkBatch->isEmpty()){
4106                                         // construct query
4107                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4108
4109                                         $variantQuery =  "SELECT page_id, page_namespace, page_title, page_is_redirect";
4110                                         if ( $threshold > 0 ) {
4111                                                 $variantQuery .= ', page_len';
4112                                         }
4113
4114                                         $variantQuery .= " FROM $page WHERE $titleClause";
4115                                         if ( $options & RLH_FOR_UPDATE ) {
4116                                                 $variantQuery .= ' FOR UPDATE';
4117                                         }
4118
4119                                         $varRes = $dbr->query( $variantQuery, $fname );
4120
4121                                         // for each found variants, figure out link holders and replace
4122                                         while ( $s = $dbr->fetchObject($varRes) ) {
4123
4124                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4125                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4126                                                 $vardbk = $variantTitle->getDBkey();
4127
4128                                                 $holderKeys = array();
4129                                                 if(isset($variantMap[$varPdbk])){
4130                                                         $holderKeys = $variantMap[$varPdbk];
4131                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4132                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4133                                                 }
4134
4135                                                 // loop over link holders
4136                                                 foreach($holderKeys as $key){
4137                                                         $title = $this->mLinkHolders['titles'][$key];
4138                                                         if ( is_null( $title ) ) continue;
4139
4140                                                         $pdbk = $title->getPrefixedDBkey();
4141
4142                                                         if(!isset($colours[$pdbk])){
4143                                                                 // found link in some of the variants, replace the link holder data
4144                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4145                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4146
4147                                                                 // set pdbk and colour
4148                                                                 $pdbks[$key] = $varPdbk;
4149                                                                 $colours[$varPdbk] = $sk->getLinkColour( $s, $threshold );
4150                                                                 $linkcolour_ids[$s->page_id] = $pdbk;
4151                                                         }
4152                                                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4153                                                 }
4154
4155                                                 // check if the object is a variant of a category
4156                                                 if(isset($categoryMap[$vardbk])){
4157                                                         $oldkey = $categoryMap[$vardbk];
4158                                                         if($oldkey != $vardbk)
4159                                                                 $varCategories[$oldkey]=$vardbk;
4160                                                 }
4161                                         }
4162
4163                                         // rebuild the categories in original order (if there are replacements)
4164                                         if(count($varCategories)>0){
4165                                                 $newCats = array();
4166                                                 $originalCats = $this->mOutput->getCategories();
4167                                                 foreach($originalCats as $cat => $sortkey){
4168                                                         // make the replacement
4169                                                         if( array_key_exists($cat,$varCategories) )
4170                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4171                                                         else $newCats[$cat] = $sortkey;
4172                                                 }
4173                                                 $this->mOutput->setCategoryLinks($newCats);
4174                                         }
4175                                 }
4176                         }
4177
4178                         # Construct search and replace arrays
4179                         wfProfileIn( $fname.'-construct' );
4180                         $replacePairs = array();
4181                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4182                                 $pdbk = $pdbks[$key];
4183                                 $searchkey = "<!--LINK $key-->";
4184                                 $title = $this->mLinkHolders['titles'][$key];
4185                                 if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] == 'new' ) {
4186                                         $linkCache->addBadLinkObj( $title );
4187                                         $colours[$pdbk] = 'new';
4188                                         $this->mOutput->addLink( $title, 0 );
4189                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4190                                                                         $this->mLinkHolders['texts'][$key],
4191                                                                         $this->mLinkHolders['queries'][$key] );
4192                                 } else {
4193                                         $replacePairs[$searchkey] = $sk->makeColouredLinkObj( $title, $colours[$pdbk],
4194                                                                         $this->mLinkHolders['texts'][$key],
4195                                                                         $this->mLinkHolders['queries'][$key] );
4196                                 }
4197                         }
4198                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4199                         wfProfileOut( $fname.'-construct' );
4200
4201                         # Do the thing
4202                         wfProfileIn( $fname.'-replace' );
4203                         $text = preg_replace_callback(
4204                                 '/(<!--LINK .*?-->)/',
4205                                 $replacer->cb(),
4206                                 $text);
4207
4208                         wfProfileOut( $fname.'-replace' );
4209                 }
4210
4211                 # Now process interwiki link holders
4212                 # This is quite a bit simpler than internal links
4213                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4214                         wfProfileIn( $fname.'-interwiki' );
4215                         # Make interwiki link HTML
4216                         $replacePairs = array();
4217                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4218                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4219                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4220                         }
4221                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4222
4223                         $text = preg_replace_callback(
4224                                 '/<!--IWLINK (.*?)-->/',
4225                                 $replacer->cb(),
4226                                 $text );
4227                         wfProfileOut( $fname.'-interwiki' );
4228                 }
4229
4230                 wfProfileOut( $fname );
4231                 return $colours;
4232         }
4233
4234         /**
4235          * Replace <!--LINK--> link placeholders with plain text of links
4236          * (not HTML-formatted).
4237          * @param string $text
4238          * @return string
4239          */
4240         function replaceLinkHoldersText( $text ) {
4241                 $fname = 'Parser::replaceLinkHoldersText';
4242                 wfProfileIn( $fname );
4243
4244                 $text = preg_replace_callback(
4245                         '/<!--(LINK|IWLINK) (.*?)-->/',
4246                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4247                         $text );
4248
4249                 wfProfileOut( $fname );
4250                 return $text;
4251         }
4252
4253         /**
4254          * @param array $matches
4255          * @return string
4256          * @private
4257          */
4258         function replaceLinkHoldersTextCallback( $matches ) {
4259                 $type = $matches[1];
4260                 $key  = $matches[2];
4261                 if( $type == 'LINK' ) {
4262                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4263                                 return $this->mLinkHolders['texts'][$key];
4264                         }
4265                 } elseif( $type == 'IWLINK' ) {
4266                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4267                                 return $this->mInterwikiLinkHolders['texts'][$key];
4268                         }
4269                 }
4270                 return $matches[0];
4271         }
4272
4273         /**
4274          * Tag hook handler for 'pre'.
4275          */
4276         function renderPreTag( $text, $attribs ) {
4277                 // Backwards-compatibility hack
4278                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4279
4280                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4281                 return wfOpenElement( 'pre', $attribs ) .
4282                         Xml::escapeTagsOnly( $content ) .
4283                         '</pre>';
4284         }
4285
4286         /**
4287          * Renders an image gallery from a text with one line per image.
4288          * text labels may be given by using |-style alternative text. E.g.
4289          *   Image:one.jpg|The number "1"
4290          *   Image:tree.jpg|A tree
4291          * given as text will return the HTML of a gallery with two images,
4292          * labeled 'The number "1"' and
4293          * 'A tree'.
4294          */
4295         function renderImageGallery( $text, $params ) {
4296                 $ig = new ImageGallery();
4297                 $ig->setContextTitle( $this->mTitle );
4298                 $ig->setShowBytes( false );
4299                 $ig->setShowFilename( false );
4300                 $ig->setParser( $this );
4301                 $ig->setHideBadImages();
4302                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4303                 $ig->useSkin( $this->mOptions->getSkin() );
4304                 $ig->mRevisionId = $this->mRevisionId;
4305
4306                 if( isset( $params['caption'] ) ) {
4307                         $caption = $params['caption'];
4308                         $caption = htmlspecialchars( $caption );
4309                         $caption = $this->replaceInternalLinks( $caption );
4310                         $ig->setCaptionHtml( $caption );
4311                 }
4312                 if( isset( $params['perrow'] ) ) {
4313                         $ig->setPerRow( $params['perrow'] );
4314                 }
4315                 if( isset( $params['widths'] ) ) {
4316                         $ig->setWidths( $params['widths'] );
4317                 }
4318                 if( isset( $params['heights'] ) ) {
4319                         $ig->setHeights( $params['heights'] );
4320                 }
4321
4322                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4323
4324                 $lines = explode( "\n", $text );
4325                 foreach ( $lines as $line ) {
4326                         # match lines like these:
4327                         # Image:someimage.jpg|This is some image
4328                         $matches = array();
4329                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4330                         # Skip empty lines
4331                         if ( count( $matches ) == 0 ) {
4332                                 continue;
4333                         }
4334                         $tp = Title::newFromText( $matches[1] );
4335                         $nt =& $tp;
4336                         if( is_null( $nt ) ) {
4337                                 # Bogus title. Ignore these so we don't bomb out later.
4338                                 continue;
4339                         }
4340                         if ( isset( $matches[3] ) ) {
4341                                 $label = $matches[3];
4342                         } else {
4343                                 $label = '';
4344                         }
4345
4346                         $html = $this->recursiveTagParse( trim( $label ) );
4347
4348                         $ig->add( $nt, $html );
4349
4350                         # Only add real images (bug #5586)
4351                         if ( $nt->getNamespace() == NS_IMAGE ) {
4352                                 $this->mOutput->addImage( $nt->getDBkey() );
4353                         }
4354                 }
4355                 return $ig->toHTML();
4356         }
4357
4358         function getImageParams( $handler ) {
4359                 if ( $handler ) {
4360                         $handlerClass = get_class( $handler );
4361                 } else {
4362                         $handlerClass = '';
4363                 }
4364                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4365                         // Initialise static lists
4366                         static $internalParamNames = array(
4367                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4368                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4369                                         'bottom', 'text-bottom' ),
4370                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4371                                         'upright', 'border' ),
4372                         );
4373                         static $internalParamMap;
4374                         if ( !$internalParamMap ) {
4375                                 $internalParamMap = array();
4376                                 foreach ( $internalParamNames as $type => $names ) {
4377                                         foreach ( $names as $name ) {
4378                                                 $magicName = str_replace( '-', '_', "img_$name" );
4379                                                 $internalParamMap[$magicName] = array( $type, $name );
4380                                         }
4381                                 }
4382                         }
4383
4384                         // Add handler params
4385                         $paramMap = $internalParamMap;
4386                         if ( $handler ) {
4387                                 $handlerParamMap = $handler->getParamMap();
4388                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4389                                         $paramMap[$magic] = array( 'handler', $paramName );
4390                                 }
4391                         }
4392                         $this->mImageParams[$handlerClass] = $paramMap;
4393                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4394                 }
4395                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4396         }
4397
4398         /**
4399          * Parse image options text and use it to make an image
4400          */
4401         function makeImage( $title, $options ) {
4402                 # @TODO: let the MediaHandler specify its transform parameters
4403                 #
4404                 # Check if the options text is of the form "options|alt text"
4405                 # Options are:
4406                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4407                 #  * left               no resizing, just left align. label is used for alt= only
4408                 #  * right              same, but right aligned
4409                 #  * none               same, but not aligned
4410                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4411                 #  * center             center the image
4412                 #  * framed             Keep original image size, no magnify-button.
4413                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4414                 #  * upright            reduce width for upright images, rounded to full __0 px
4415                 #  * border             draw a 1px border around the image
4416                 # vertical-align values (no % or length right now):
4417                 #  * baseline
4418                 #  * sub
4419                 #  * super
4420                 #  * top
4421                 #  * text-top
4422                 #  * middle
4423                 #  * bottom
4424                 #  * text-bottom
4425
4426                 $parts = array_map( 'trim', explode( '|', $options) );
4427                 $sk = $this->mOptions->getSkin();
4428
4429                 # Give extensions a chance to select the file revision for us
4430                 $skip = $time = false;
4431                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4432
4433                 if ( $skip ) {
4434                         return $sk->makeLinkObj( $title );
4435                 }
4436
4437                 # Get parameter map
4438                 $file = wfFindFile( $title, $time );
4439                 $handler = $file ? $file->getHandler() : false;
4440
4441                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4442
4443                 # Process the input parameters
4444                 $caption = '';
4445                 $params = array( 'frame' => array(), 'handler' => array(),
4446                         'horizAlign' => array(), 'vertAlign' => array() );
4447                 foreach( $parts as $part ) {
4448                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4449                         if ( isset( $paramMap[$magicName] ) ) {
4450                                 list( $type, $paramName ) = $paramMap[$magicName];
4451                                 $params[$type][$paramName] = $value;
4452
4453                                 // Special case; width and height come in one variable together
4454                                 if( $type == 'handler' && $paramName == 'width' ) {
4455                                         $m = array();
4456                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4457                                                 $params[$type]['width'] = intval( $m[1] );
4458                                                 $params[$type]['height'] = intval( $m[2] );
4459                                         } else {
4460                                                 $params[$type]['width'] = intval( $value );
4461                                         }
4462                                 }
4463                         } else {
4464                                 $caption = $part;
4465                         }
4466                 }
4467
4468                 # Process alignment parameters
4469                 if ( $params['horizAlign'] ) {
4470                         $params['frame']['align'] = key( $params['horizAlign'] );
4471                 }
4472                 if ( $params['vertAlign'] ) {
4473                         $params['frame']['valign'] = key( $params['vertAlign'] );
4474                 }
4475
4476                 # Validate the handler parameters
4477                 if ( $handler ) {
4478                         foreach ( $params['handler'] as $name => $value ) {
4479                                 if ( !$handler->validateParam( $name, $value ) ) {
4480                                         unset( $params['handler'][$name] );
4481                                 }
4482                         }
4483                 }
4484
4485                 # Strip bad stuff out of the alt text
4486                 $alt = $this->replaceLinkHoldersText( $caption );
4487
4488                 # make sure there are no placeholders in thumbnail attributes
4489                 # that are later expanded to html- so expand them now and
4490                 # remove the tags
4491                 $alt = $this->mStripState->unstripBoth( $alt );
4492                 $alt = Sanitizer::stripAllTags( $alt );
4493
4494                 $params['frame']['alt'] = $alt;
4495                 $params['frame']['caption'] = $caption;
4496
4497                 # Linker does the rest
4498                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'] );
4499
4500                 # Give the handler a chance to modify the parser object
4501                 if ( $handler ) {
4502                         $handler->parserTransformHook( $this, $file );
4503                 }
4504
4505                 return $ret;
4506         }
4507
4508         /**
4509          * Set a flag in the output object indicating that the content is dynamic and
4510          * shouldn't be cached.
4511          */
4512         function disableCache() {
4513                 wfDebug( "Parser output marked as uncacheable.\n" );
4514                 $this->mOutput->mCacheTime = -1;
4515         }
4516
4517         /**#@+
4518          * Callback from the Sanitizer for expanding items found in HTML attribute
4519          * values, so they can be safely tested and escaped.
4520          * @param string $text
4521          * @param PPFrame $frame
4522          * @return string
4523          * @private
4524          */
4525         function attributeStripCallback( &$text, $frame = false ) {
4526                 $text = $this->replaceVariables( $text, $frame );
4527                 $text = $this->mStripState->unstripBoth( $text );
4528                 return $text;
4529         }
4530
4531         /**#@-*/
4532
4533         /**#@+
4534          * Accessor/mutator
4535          */
4536         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4537         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4538         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4539         /**#@-*/
4540
4541         /**#@+
4542          * Accessor
4543          */
4544         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4545         /**#@-*/
4546
4547
4548         /**
4549          * Break wikitext input into sections, and either pull or replace
4550          * some particular section's text.
4551          *
4552          * External callers should use the getSection and replaceSection methods.
4553          *
4554          * @param string $text Page wikitext
4555          * @param string $section A section identifier string of the form:
4556          *   <flag1> - <flag2> - ... - <section number>
4557          *
4558          * Currently the only recognised flag is "T", which means the target section number
4559          * was derived during a template inclusion parse, in other words this is a template
4560          * section edit link. If no flags are given, it was an ordinary section edit link.
4561          * This flag is required to avoid a section numbering mismatch when a section is
4562          * enclosed by <includeonly> (bug 6563).
4563          *
4564          * The section number 0 pulls the text before the first heading; other numbers will
4565          * pull the given section along with its lower-level subsections. If the section is
4566          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4567          *
4568          * @param string $mode One of "get" or "replace"
4569          * @param string $newText Replacement text for section data.
4570          * @return string for "get", the extracted section text.
4571          *                for "replace", the whole page with the section replaced.
4572          */
4573         private function extractSections( $text, $section, $mode, $newText='' ) {
4574                 global $wgTitle;
4575                 $this->clearState();
4576                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4577                 $this->mOptions = new ParserOptions;
4578                 $this->setOutputType( self::OT_WIKI );
4579                 $outText = '';
4580                 $frame = $this->getPreprocessor()->newFrame();
4581
4582                 // Process section extraction flags
4583                 $flags = 0;
4584                 $sectionParts = explode( '-', $section );
4585                 $sectionIndex = array_pop( $sectionParts );
4586                 foreach ( $sectionParts as $part ) {
4587                         if ( $part == 'T' ) {
4588                                 $flags |= self::PTD_FOR_INCLUSION;
4589                         }
4590                 }
4591                 // Preprocess the text
4592                 $root = $this->preprocessToDom( $text, $flags );
4593
4594                 // <h> nodes indicate section breaks
4595                 // They can only occur at the top level, so we can find them by iterating the root's children
4596                 $node = $root->getFirstChild();
4597
4598                 // Find the target section
4599                 if ( $sectionIndex == 0 ) {
4600                         // Section zero doesn't nest, level=big
4601                         $targetLevel = 1000;
4602                 } else {
4603             while ( $node ) {
4604                 if ( $node->getName() == 'h' ) {
4605                     $bits = $node->splitHeading();
4606                                         if ( $bits['i'] == $sectionIndex ) {
4607                                         $targetLevel = $bits['level'];
4608                                                 break;
4609                                         }
4610                                 }
4611                                 if ( $mode == 'replace' ) {
4612                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4613                                 }
4614                                 $node = $node->getNextSibling();
4615                         }
4616                 }
4617
4618                 if ( !$node ) {
4619                         // Not found
4620                         if ( $mode == 'get' ) {
4621                                 return $newText;
4622                         } else {
4623                                 return $text;
4624                         }
4625                 }
4626
4627                 // Find the end of the section, including nested sections
4628                 do {
4629                         if ( $node->getName() == 'h' ) {
4630                                 $bits = $node->splitHeading();
4631                                 $curLevel = $bits['level'];
4632                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4633                                         break;
4634                                 }
4635                         }
4636                         if ( $mode == 'get' ) {
4637                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4638                         }
4639                         $node = $node->getNextSibling();
4640                 } while ( $node );
4641
4642                 // Write out the remainder (in replace mode only)
4643                 if ( $mode == 'replace' ) {
4644                         // Output the replacement text
4645                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4646                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4647                         $outText .= $newText . "\n\n";
4648                         while ( $node ) {
4649                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4650                                 $node = $node->getNextSibling();
4651                         }
4652                 }
4653
4654                 if ( is_string( $outText ) ) {
4655                         // Re-insert stripped tags
4656                         $outText = trim( $this->mStripState->unstripBoth( $outText ) );
4657                 }
4658
4659                 return $outText;
4660         }
4661
4662         /**
4663          * This function returns the text of a section, specified by a number ($section).
4664          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4665          * the first section before any such heading (section 0).
4666          *
4667          * If a section contains subsections, these are also returned.
4668          *
4669          * @param string $text text to look in
4670          * @param string $section section identifier
4671          * @param string $deftext default to return if section is not found
4672          * @return string text of the requested section
4673          */
4674         public function getSection( $text, $section, $deftext='' ) {
4675                 return $this->extractSections( $text, $section, "get", $deftext );
4676         }
4677
4678         public function replaceSection( $oldtext, $section, $text ) {
4679                 return $this->extractSections( $oldtext, $section, "replace", $text );
4680         }
4681
4682         /**
4683          * Get the timestamp associated with the current revision, adjusted for
4684          * the default server-local timestamp
4685          */
4686         function getRevisionTimestamp() {
4687                 if ( is_null( $this->mRevisionTimestamp ) ) {
4688                         wfProfileIn( __METHOD__ );
4689                         global $wgContLang;
4690                         $dbr = wfGetDB( DB_SLAVE );
4691                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4692                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4693
4694                         // Normalize timestamp to internal MW format for timezone processing.
4695                         // This has the added side-effect of replacing a null value with
4696                         // the current time, which gives us more sensible behavior for
4697                         // previews.
4698                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4699
4700                         // The cryptic '' timezone parameter tells to use the site-default
4701                         // timezone offset instead of the user settings.
4702                         //
4703                         // Since this value will be saved into the parser cache, served
4704                         // to other users, and potentially even used inside links and such,
4705                         // it needs to be consistent for all visitors.
4706                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4707
4708                         wfProfileOut( __METHOD__ );
4709                 }
4710                 return $this->mRevisionTimestamp;
4711         }
4712
4713         /**
4714          * Mutator for $mDefaultSort
4715          *
4716          * @param $sort New value
4717          */
4718         public function setDefaultSort( $sort ) {
4719                 $this->mDefaultSort = $sort;
4720         }
4721
4722         /**
4723          * Accessor for $mDefaultSort
4724          * Will use the title/prefixed title if none is set
4725          *
4726          * @return string
4727          */
4728         public function getDefaultSort() {
4729                 if( $this->mDefaultSort !== false ) {
4730                         return $this->mDefaultSort;
4731                 } else {
4732                         return $this->mTitle->getNamespace() == NS_CATEGORY
4733                                         ? $this->mTitle->getText()
4734                                         : $this->mTitle->getPrefixedText();
4735                 }
4736         }
4737
4738         /**
4739          * Try to guess the section anchor name based on a wikitext fragment
4740          * presumably extracted from a heading, for example "Header" from
4741          * "== Header ==".
4742          */
4743         public function guessSectionNameFromWikiText( $text ) {
4744                 # Strip out wikitext links(they break the anchor)
4745                 $text = $this->stripSectionName( $text );
4746                 $headline = Sanitizer::decodeCharReferences( $text );
4747                 # strip out HTML
4748                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4749                 $headline = trim( $headline );
4750                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4751                 $replacearray = array(
4752                         '%3A' => ':',
4753                         '%' => '.'
4754                 );
4755                 return str_replace(
4756                         array_keys( $replacearray ),
4757                         array_values( $replacearray ),
4758                         $sectionanchor );
4759         }
4760
4761         /**
4762          * Strips a text string of wikitext for use in a section anchor
4763          *
4764          * Accepts a text string and then removes all wikitext from the
4765          * string and leaves only the resultant text (i.e. the result of
4766          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4767          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4768          * to create valid section anchors by mimicing the output of the
4769          * parser when headings are parsed.
4770          *
4771          * @param $text string Text string to be stripped of wikitext
4772          * for use in a Section anchor
4773          * @return Filtered text string
4774          */
4775         public function stripSectionName( $text ) {
4776                 # Strip internal link markup
4777                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4778                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4779
4780                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4781                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4782                 # on how many empty links there are on the page - need to figure that out.
4783                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4784
4785                 # Parse wikitext quotes (italics & bold)
4786                 $text = $this->doQuotes($text);
4787
4788                 # Strip HTML tags
4789                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4790                 return $text;
4791         }
4792
4793         function srvus( $text ) {
4794                 return $this->testSrvus( $text, $this->mOutputType );
4795         }
4796
4797         /**
4798          * strip/replaceVariables/unstrip for preprocessor regression testing
4799          */
4800         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
4801                 $this->clearState();
4802                 if ( ! ( $title instanceof Title ) ) {
4803                         $title = Title::newFromText( $title );
4804                 }
4805                 $this->mTitle = $title;
4806                 $this->mOptions = $options;
4807                 $this->setOutputType( $outputType );
4808                 $text = $this->replaceVariables( $text );
4809                 $text = $this->mStripState->unstripBoth( $text );
4810                 $text = Sanitizer::removeHTMLtags( $text );
4811                 return $text;
4812         }
4813
4814         function testPst( $text, $title, $options ) {
4815                 global $wgUser;
4816                 if ( ! ( $title instanceof Title ) ) {
4817                         $title = Title::newFromText( $title );
4818                 }
4819                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
4820         }
4821
4822         function testPreprocess( $text, $title, $options ) {
4823                 if ( ! ( $title instanceof Title ) ) {
4824                         $title = Title::newFromText( $title );
4825                 }
4826                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
4827         }
4828
4829         function markerSkipCallback( $s, $callback ) {
4830                 $i = 0;
4831                 $out = '';
4832                 while ( $i < strlen( $s ) ) {
4833                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
4834                         if ( $markerStart === false ) {
4835                                 $out .= call_user_func( $callback, substr( $s, $i ) );
4836                                 break;
4837                         } else {
4838                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
4839                                 $markerEnd = strpos( $s, $this->mMarkerSuffix, $markerStart );
4840                                 if ( $markerEnd === false ) {
4841                                         $out .= substr( $s, $markerStart );
4842                                         break;
4843                                 } else {
4844                                         $markerEnd += strlen( $this->mMarkerSuffix );
4845                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
4846                                         $i = $markerEnd;
4847                                 }
4848                         }
4849                 }
4850                 return $out;
4851         }
4852 }
4853
4854 /**
4855  * @todo document, briefly.
4856  * @addtogroup Parser
4857  */
4858 class StripState {
4859         var $general, $nowiki;
4860
4861         function __construct() {
4862                 $this->general = new ReplacementArray;
4863                 $this->nowiki = new ReplacementArray;
4864         }
4865
4866         function unstripGeneral( $text ) {
4867                 wfProfileIn( __METHOD__ );
4868                 do {
4869                         $oldText = $text;
4870                         $text = $this->general->replace( $text );
4871                 } while ( $text != $oldText );
4872                 wfProfileOut( __METHOD__ );
4873                 return $text;
4874         }
4875
4876         function unstripNoWiki( $text ) {
4877                 wfProfileIn( __METHOD__ );
4878                 do {
4879                         $oldText = $text;
4880                         $text = $this->nowiki->replace( $text );
4881                 } while ( $text != $oldText );
4882                 wfProfileOut( __METHOD__ );
4883                 return $text;
4884         }
4885
4886         function unstripBoth( $text ) {
4887                 wfProfileIn( __METHOD__ );
4888                 do {
4889                         $oldText = $text;
4890                         $text = $this->general->replace( $text );
4891                         $text = $this->nowiki->replace( $text );
4892                 } while ( $text != $oldText );
4893                 wfProfileOut( __METHOD__ );
4894                 return $text;
4895         }
4896 }
4897
4898 /**
4899  * @todo document, briefly.
4900  * @addtogroup Parser
4901  */
4902 class OnlyIncludeReplacer {
4903         var $output = '';
4904
4905         function replace( $matches ) {
4906                 if ( substr( $matches[1], -1 ) == "\n" ) {
4907                         $this->output .= substr( $matches[1], 0, -1 );
4908                 } else {
4909                         $this->output .= $matches[1];
4910                 }
4911         }
4912 }
4913