includes/parser/Parser.php

   1 <?php
   2 /**
   3  * @defgroup Parser Parser
   4  *
   5  * @file
   6  * @ingroup Parser
   7  * File for Parser and related classes
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * preprocess()
  24  *   removes HTML comments and expands templates
  25  * cleanSig()
  26  *   Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *   Extracts sections from an article for section editing
  29  *
  30  * Globals used:
  31  *    objects:   $wgLang, $wgContLang
  32  *
  33  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  34  *
  35  * settings:
  36  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  37  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  38  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  39  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @ingroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  65
  66         // State constants for the definition list colon extraction
  67         const COLON_STATE_TEXT = 0;
  68         const COLON_STATE_TAG = 1;
  69         const COLON_STATE_TAGSTART = 2;
  70         const COLON_STATE_CLOSETAG = 3;
  71         const COLON_STATE_TAGSLASH = 4;
  72         const COLON_STATE_COMMENT = 5;
  73         const COLON_STATE_COMMENTDASH = 6;
  74         const COLON_STATE_COMMENTDASHDASH = 7;
  75
  76         // Flags for preprocessToDom
  77         const PTD_FOR_INCLUSION = 1;
  78
  79         // Allowed values for $this->mOutputType
  80         // Parameter to startExternalParse().
  81         const OT_HTML = 1;
  82         const OT_WIKI = 2;
  83         const OT_PREPROCESS = 3;
  84         const OT_MSG = 3;
  85
  86         // Marker Suffix needs to be accessible staticly.
  87         const MARKER_SUFFIX = "-QINU\x7f";
  88
  89         /**#@+
  90          * @private
  91          */
  92         # Persistent:
  93         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  94                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerIndex, $mPreprocessor,
  95                 $mExtLinkBracketedRegex, $mUrlProtocols, $mDefaultStripList, $mVarCache, $mConf,
  96                 $mFunctionTagHooks;
  97
  98
  99         # Cleared with clearState():
 100         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 101         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 102         var $mLinkHolders, $mLinkID;
 103         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 104         var $mTplExpandCache; // empty-frame expansion cache
 105         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 106         var $mExpensiveFunctionCount; // number of expensive parser function calls
 107
 108         # Temporary
 109         # These are variables reset at least once per parse regardless of $clearState
 110         var $mOptions,      // ParserOptions object
 111                 $mTitle,        // Title context, used for self-link rendering and similar things
 112                 $mOutputType,   // Output type, one of the OT_xxx constants
 113                 $ot,            // Shortcut alias, see setOutputType()
 114                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 115                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 116                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 117
 118         /**#@-*/
 119
 120         /**
 121          * Constructor
 122          *
 123          * @public
 124          */
 125         function __construct( $conf = array() ) {
 126                 $this->mConf = $conf;
 127                 $this->mTagHooks = array();
 128                 $this->mTransparentTagHooks = array();
 129                 $this->mFunctionHooks = array();
 130                 $this->mFunctionTagHooks = array();
 131                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 132                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery' );
 133                 $this->mUrlProtocols = wfUrlProtocols();
 134                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 135                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 136                 $this->mVarCache = array();
 137                 if ( isset( $conf['preprocessorClass'] ) ) {
 138                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 139                 } elseif ( extension_loaded( 'domxml' ) ) {
 140                         // PECL extension that conflicts with the core DOM extension (bug 13770)
 141                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 142                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 143                 } elseif ( extension_loaded( 'dom' ) ) {
 144                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 145                 } else {
 146                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 147                 }
 148                 $this->mMarkerIndex = 0;
 149                 $this->mFirstCall = true;
 150         }
 151
 152         /**
 153          * Reduce memory usage to reduce the impact of circular references
 154          */
 155         function __destruct() {
 156                 if ( isset( $this->mLinkHolders ) ) {
 157                         $this->mLinkHolders->__destruct();
 158                 }
 159                 foreach ( $this as $name => $value ) {
 160                         unset( $this->$name );
 161                 }
 162         }
 163
 164         /**
 165          * Do various kinds of initialisation on the first call of the parser
 166          */
 167         function firstCallInit() {
 168                 if ( !$this->mFirstCall ) {
 169                         return;
 170                 }
 171                 $this->mFirstCall = false;
 172
 173                 wfProfileIn( __METHOD__ );
 174
 175                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 176                 CoreParserFunctions::register( $this );
 177                 $this->initialiseVariables();
 178
 179                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 180                 wfProfileOut( __METHOD__ );
 181         }
 182
 183         /**
 184          * Clear Parser state
 185          *
 186          * @private
 187          */
 188         function clearState() {
 189                 wfProfileIn( __METHOD__ );
 190                 if ( $this->mFirstCall ) {
 191                         $this->firstCallInit();
 192                 }
 193                 $this->mOutput = new ParserOutput;
 194                 $this->mAutonumber = 0;
 195                 $this->mLastSection = '';
 196                 $this->mDTopen = false;
 197                 $this->mIncludeCount = array();
 198                 $this->mStripState = new StripState;
 199                 $this->mArgStack = false;
 200                 $this->mInPre = false;
 201                 $this->mLinkHolders = new LinkHolderArray( $this );
 202                 $this->mLinkID = 0;
 203                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 204
 205                 /**
 206                  * Prefix for temporary replacement strings for the multipass parser.
 207                  * \x07 should never appear in input as it's disallowed in XML.
 208                  * Using it at the front also gives us a little extra robustness
 209                  * since it shouldn't match when butted up against identifier-like
 210                  * string constructs.
 211                  *
 212                  * Must not consist of all title characters, or else it will change
 213                  * the behaviour of <nowiki> in a link.
 214                  */
 215                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 216                 # Changed to \x7f to allow XML double-parsing -- TS
 217                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 218
 219
 220                 # Clear these on every parse, bug 4549
 221                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 222
 223                 $this->mShowToc = true;
 224                 $this->mForceTocPosition = false;
 225                 $this->mIncludeSizes = array(
 226                         'post-expand' => 0,
 227                         'arg' => 0,
 228                 );
 229                 $this->mPPNodeCount = 0;
 230                 $this->mDefaultSort = false;
 231                 $this->mHeadings = array();
 232                 $this->mDoubleUnderscores = array();
 233                 $this->mExpensiveFunctionCount = 0;
 234
 235                 # Fix cloning
 236                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 237                         $this->mPreprocessor = null;
 238                 }
 239
 240                 wfRunHooks( 'ParserClearState', array( &$this ) );
 241                 wfProfileOut( __METHOD__ );
 242         }
 243
 244         function setOutputType( $ot ) {
 245                 $this->mOutputType = $ot;
 246                 // Shortcut alias
 247                 $this->ot = array(
 248                         'html' => $ot == self::OT_HTML,
 249                         'wiki' => $ot == self::OT_WIKI,
 250                         'pre' => $ot == self::OT_PREPROCESS,
 251                 );
 252         }
 253
 254         /**
 255          * Set the context title
 256          */
 257         function setTitle( $t ) {
 258                 if ( !$t || $t instanceof FakeTitle ) {
 259                         $t = Title::newFromText( 'NO TITLE' );
 260                 }
 261                 if ( strval( $t->getFragment() ) !== '' ) {
 262                         # Strip the fragment to avoid various odd effects
 263                         $this->mTitle = clone $t;
 264                         $this->mTitle->setFragment( '' );
 265                 } else {
 266                         $this->mTitle = $t;
 267                 }
 268         }
 269
 270         /**
 271          * Accessor for mUniqPrefix.
 272          *
 273          * @public
 274          */
 275         function uniqPrefix() {
 276                 if( !isset( $this->mUniqPrefix ) ) {
 277                         // @fixme this is probably *horribly wrong*
 278                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 279                         // if this is called for a parser cache hit, the parser may not
 280                         // have ever been initialized in the first place.
 281                         // Not really sure what the heck is supposed to be going on here.
 282                         return '';
 283                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 284                 }
 285                 return $this->mUniqPrefix;
 286         }
 287
 288         /**
 289          * Convert wikitext to HTML
 290          * Do not call this function recursively.
 291          *
 292          * @param $text String: text we want to parse
 293          * @param $title A title object
 294          * @param $options ParserOptions
 295          * @param $linestart boolean
 296          * @param $clearState boolean
 297          * @param $revid Int: number to pass in {{REVISIONID}}
 298          * @return ParserOutput a ParserOutput
 299          */
 300         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 301                 /**
 302                  * First pass--just handle <nowiki> sections, pass the rest off
 303                  * to internalParse() which does all the real work.
 304                  */
 305
 306                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 307                 $fname = __METHOD__.'-' . wfGetCaller();
 308                 wfProfileIn( __METHOD__ );
 309                 wfProfileIn( $fname );
 310
 311                 if ( $clearState ) {
 312                         $this->clearState();
 313                 }
 314
 315                 $this->mOptions = $options;
 316                 $this->setTitle( $title );
 317                 $oldRevisionId = $this->mRevisionId;
 318                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 319                 if( $revid !== null ) {
 320                         $this->mRevisionId = $revid;
 321                         $this->mRevisionTimestamp = null;
 322                 }
 323                 $this->setOutputType( self::OT_HTML );
 324                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 325                 # No more strip!
 326                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 327                 $text = $this->internalParse( $text );
 328                 $text = $this->mStripState->unstripGeneral( $text );
 329
 330                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 331                 $fixtags = array(
 332                         # french spaces, last one Guillemet-left
 333                         # only if there is something before the space
 334                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 335                         # french spaces, Guillemet-right
 336                         '/(\\302\\253) /' => '\\1&nbsp;',
 337                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 338                 );
 339                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 340
 341                 $text = $this->doBlockLevels( $text, $linestart );
 342
 343                 $this->replaceLinkHolders( $text );
 344
 345                 # the position of the parserConvert() call should not be changed. it
 346                 # assumes that the links are all replaced and the only thing left
 347                 # is the <nowiki> mark.
 348                 # Side-effects: this calls $this->mOutput->setTitleText()
 349                 $text = $wgContLang->parserConvert( $text, $this );
 350
 351                 $text = $this->mStripState->unstripNoWiki( $text );
 352
 353                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 354
 355 //!JF Move to its own function
 356
 357                 $uniq_prefix = $this->mUniqPrefix;
 358                 $matches = array();
 359                 $elements = array_keys( $this->mTransparentTagHooks );
 360                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 361
 362                 foreach( $matches as $marker => $data ) {
 363                         list( $element, $content, $params, $tag ) = $data;
 364                         $tagName = strtolower( $element );
 365                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 366                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 367                                         array( $content, $params, $this ) );
 368                         } else {
 369                                 $output = $tag;
 370                         }
 371                         $this->mStripState->general->setPair( $marker, $output );
 372                 }
 373                 $text = $this->mStripState->unstripGeneral( $text );
 374
 375                 $text = Sanitizer::normalizeCharReferences( $text );
 376
 377                 if ( ( $wgUseTidy && $this->mOptions->mTidy ) || $wgAlwaysUseTidy ) {
 378                         $text = MWTidy::tidy( $text );
 379                 } else {
 380                         # attempt to sanitize at least some nesting problems
 381                         # (bug #2702 and quite a few others)
 382                         $tidyregs = array(
 383                                 # ''Something [http://www.cool.com cool''] -->
 384                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 385                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 386                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 387                                 # fix up an anchor inside another anchor, only
 388                                 # at least for a single single nested link (bug 3695)
 389                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 390                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 391                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 392                                 # contains a div, so fix it up here; replace
 393                                 # div with escaped text
 394                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 395                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 396                                 # remove empty italic or bold tag pairs, some
 397                                 # introduced by rules above
 398                                 '/<([bi])><\/\\1>/' => '',
 399                         );
 400
 401                         $text = preg_replace(
 402                                 array_keys( $tidyregs ),
 403                                 array_values( $tidyregs ),
 404                                 $text );
 405                 }
 406                 global $wgExpensiveParserFunctionLimit;
 407                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 408                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 409                 }
 410
 411                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 412
 413                 # Information on include size limits, for the benefit of users who try to skirt them
 414                 if ( $this->mOptions->getEnableLimitReport() ) {
 415                         global $wgExpensiveParserFunctionLimit;
 416                         $max = $this->mOptions->getMaxIncludeSize();
 417                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 418                         $limitReport =
 419                                 "NewPP limit report\n" .
 420                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 421                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 422                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 423                                 $PFreport;
 424                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 425                         $text .= "\n<!-- \n$limitReport-->\n";
 426                 }
 427                 $this->mOutput->setText( $text );
 428                 $this->mRevisionId = $oldRevisionId;
 429                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 430                 wfProfileOut( $fname );
 431                 wfProfileOut( __METHOD__ );
 432
 433                 return $this->mOutput;
 434         }
 435
 436         /**
 437          * Recursive parser entry point that can be called from an extension tag
 438          * hook.
 439          *
 440          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 441          *
 442          * @param $text String: text extension wants to have parsed
 443          * @param PPFrame $frame: The frame to use for expanding any template variables
 444          */
 445         function recursiveTagParse( $text, $frame=false ) {
 446                 wfProfileIn( __METHOD__ );
 447                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 448                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 449                 $text = $this->internalParse( $text, false, $frame );
 450                 wfProfileOut( __METHOD__ );
 451                 return $text;
 452         }
 453
 454         /**
 455          * Expand templates and variables in the text, producing valid, static wikitext.
 456          * Also removes comments.
 457          */
 458         function preprocess( $text, $title, $options, $revid = null ) {
 459                 wfProfileIn( __METHOD__ );
 460                 $this->clearState();
 461                 $this->setOutputType( self::OT_PREPROCESS );
 462                 $this->mOptions = $options;
 463                 $this->setTitle( $title );
 464                 if( $revid !== null ) {
 465                         $this->mRevisionId = $revid;
 466                 }
 467                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 468                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 469                 $text = $this->replaceVariables( $text );
 470                 $text = $this->mStripState->unstripBoth( $text );
 471                 wfProfileOut( __METHOD__ );
 472                 return $text;
 473         }
 474
 475         /**
 476          * Get a random string
 477          *
 478          * @private
 479          * @static
 480          */
 481         function getRandomString() {
 482                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 483         }
 484
 485         function &getTitle() { return $this->mTitle; }
 486         function getOptions() { return $this->mOptions; }
 487         function getRevisionId() { return $this->mRevisionId; }
 488         function getOutput() { return $this->mOutput; }
 489         function nextLinkID() { return $this->mLinkID++; }
 490
 491         function getFunctionLang() {
 492                 global $wgLang, $wgContLang;
 493
 494                 $target = $this->mOptions->getTargetLanguage();
 495                 if ( $target !== null ) {
 496                         return $target;
 497                 } else {
 498                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 499                 }
 500         }
 501
 502         /**
 503          * Get a preprocessor object
 504          */
 505         function getPreprocessor() {
 506                 if ( !isset( $this->mPreprocessor ) ) {
 507                         $class = $this->mPreprocessorClass;
 508                         $this->mPreprocessor = new $class( $this );
 509                 }
 510                 return $this->mPreprocessor;
 511         }
 512
 513         /**
 514          * Replaces all occurrences of HTML-style comments and the given tags
 515          * in the text with a random marker and returns the next text. The output
 516          * parameter $matches will be an associative array filled with data in
 517          * the form:
 518          *   'UNIQ-xxxxx' => array(
 519          *     'element',
 520          *     'tag content',
 521          *     array( 'param' => 'x' ),
 522          *     '<element param="x">tag content</element>' ) )
 523          *
 524          * @param $elements list of element names. Comments are always extracted.
 525          * @param $text Source text string.
 526          * @param $uniq_prefix
 527          *
 528          * @public
 529          * @static
 530          */
 531         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 532                 static $n = 1;
 533                 $stripped = '';
 534                 $matches = array();
 535
 536                 $taglist = implode( '|', $elements );
 537                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 538
 539                 while ( '' != $text ) {
 540                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 541                         $stripped .= $p[0];
 542                         if( count( $p ) < 5 ) {
 543                                 break;
 544                         }
 545                         if( count( $p ) > 5 ) {
 546                                 // comment
 547                                 $element    = $p[4];
 548                                 $attributes = '';
 549                                 $close      = '';
 550                                 $inside     = $p[5];
 551                         } else {
 552                                 // tag
 553                                 $element    = $p[1];
 554                                 $attributes = $p[2];
 555                                 $close      = $p[3];
 556                                 $inside     = $p[4];
 557                         }
 558
 559                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 560                         $stripped .= $marker;
 561
 562                         if ( $close === '/>' ) {
 563                                 // Empty element tag, <tag />
 564                                 $content = null;
 565                                 $text = $inside;
 566                                 $tail = null;
 567                         } else {
 568                                 if( $element === '!--' ) {
 569                                         $end = '/(-->)/';
 570                                 } else {
 571                                         $end = "/(<\\/$element\\s*>)/i";
 572                                 }
 573                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 574                                 $content = $q[0];
 575                                 if( count( $q ) < 3 ) {
 576                                         # No end tag -- let it run out to the end of the text.
 577                                         $tail = '';
 578                                         $text = '';
 579                                 } else {
 580                                         $tail = $q[1];
 581                                         $text = $q[2];
 582                                 }
 583                         }
 584
 585                         $matches[$marker] = array( $element,
 586                                 $content,
 587                                 Sanitizer::decodeTagAttributes( $attributes ),
 588                                 "<$element$attributes$close$content$tail" );
 589                 }
 590                 return $stripped;
 591         }
 592
 593         /**
 594          * Get a list of strippable XML-like elements
 595          */
 596         function getStripList() {
 597                 global $wgRawHtml;
 598                 $elements = $this->mStripList;
 599                 if( $wgRawHtml ) {
 600                         $elements[] = 'html';
 601                 }
 602                 if( $this->mOptions->getUseTeX() ) {
 603                         $elements[] = 'math';
 604                 }
 605                 return $elements;
 606         }
 607
 608         /**
 609          * @deprecated use replaceVariables
 610          */
 611         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 612                 return $text;
 613         }
 614
 615         /**
 616          * Restores pre, math, and other extensions removed by strip()
 617          *
 618          * always call unstripNoWiki() after this one
 619          * @private
 620          * @deprecated use $this->mStripState->unstrip()
 621          */
 622         function unstrip( $text, $state ) {
 623                 return $state->unstripGeneral( $text );
 624         }
 625
 626         /**
 627          * Always call this after unstrip() to preserve the order
 628          *
 629          * @private
 630          * @deprecated use $this->mStripState->unstrip()
 631          */
 632         function unstripNoWiki( $text, $state ) {
 633                 return $state->unstripNoWiki( $text );
 634         }
 635
 636         /**
 637          * @deprecated use $this->mStripState->unstripBoth()
 638          */
 639         function unstripForHTML( $text ) {
 640                 return $this->mStripState->unstripBoth( $text );
 641         }
 642
 643         /**
 644          * Add an item to the strip state
 645          * Returns the unique tag which must be inserted into the stripped text
 646          * The tag will be replaced with the original text in unstrip()
 647          *
 648          * @private
 649          */
 650         function insertStripItem( $text ) {
 651                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 652                 $this->mMarkerIndex++;
 653                 $this->mStripState->general->setPair( $rnd, $text );
 654                 return $rnd;
 655         }
 656
 657         /**
 658          * Interface with html tidy
 659          * @deprecated Use MWTidy::tidy()
 660          */
 661         public static function tidy( $text ) {
 662                 wfDeprecated( __METHOD__ );
 663                 return MWTidy::tidy( $text );
 664         }
 665
 666         /**
 667          * parse the wiki syntax used to render tables
 668          *
 669          * @private
 670          */
 671         function doTableStuff ( $text ) {
 672                 wfProfileIn( __METHOD__ );
 673
 674                 $lines = StringUtils::explode( "\n", $text );
 675                 $out = '';
 676                 $td_history = array (); // Is currently a td tag open?
 677                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 678                 $tr_history = array (); // Is currently a tr tag open?
 679                 $tr_attributes = array (); // history of tr attributes
 680                 $has_opened_tr = array(); // Did this table open a <tr> element?
 681                 $indent_level = 0; // indent level of the table
 682
 683                 foreach ( $lines as $outLine ) {
 684                         $line = trim( $outLine );
 685
 686                         if( $line == '' ) { // empty line, go to next line
 687                                 $out .= $outLine."\n";
 688                                 continue;
 689                         }
 690                         $first_character = $line[0];
 691                         $matches = array();
 692
 693                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 694                                 // First check if we are starting a new table
 695                                 $indent_level = strlen( $matches[1] );
 696
 697                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 698                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 699
 700                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 701                                 array_push ( $td_history , false );
 702                                 array_push ( $last_tag_history , '' );
 703                                 array_push ( $tr_history , false );
 704                                 array_push ( $tr_attributes , '' );
 705                                 array_push ( $has_opened_tr , false );
 706                         } else if ( count ( $td_history ) == 0 ) {
 707                                 // Don't do any of the following
 708                                 $out .= $outLine."\n";
 709                                 continue;
 710                         } else if ( substr ( $line , 0 , 2 ) === '|}' ) {
 711                                 // We are ending a table
 712                                 $line = '</table>' . substr ( $line , 2 );
 713                                 $last_tag = array_pop ( $last_tag_history );
 714
 715                                 if ( !array_pop ( $has_opened_tr ) ) {
 716                                         $line = "<tr><td></td></tr>{$line}";
 717                                 }
 718
 719                                 if ( array_pop ( $tr_history ) ) {
 720                                         $line = "</tr>{$line}";
 721                                 }
 722
 723                                 if ( array_pop ( $td_history ) ) {
 724                                         $line = "</{$last_tag}>{$line}";
 725                                 }
 726                                 array_pop ( $tr_attributes );
 727                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 728                         } else if ( substr ( $line , 0 , 2 ) === '|-' ) {
 729                                 // Now we have a table row
 730                                 $line = preg_replace( '#^\|-+#', '', $line );
 731
 732                                 // Whats after the tag is now only attributes
 733                                 $attributes = $this->mStripState->unstripBoth( $line );
 734                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 735                                 array_pop ( $tr_attributes );
 736                                 array_push ( $tr_attributes , $attributes );
 737
 738                                 $line = '';
 739                                 $last_tag = array_pop ( $last_tag_history );
 740                                 array_pop ( $has_opened_tr );
 741                                 array_push ( $has_opened_tr , true );
 742
 743                                 if ( array_pop ( $tr_history ) ) {
 744                                         $line = '</tr>';
 745                                 }
 746
 747                                 if ( array_pop ( $td_history ) ) {
 748                                         $line = "</{$last_tag}>{$line}";
 749                                 }
 750
 751                                 $outLine = $line;
 752                                 array_push ( $tr_history , false );
 753                                 array_push ( $td_history , false );
 754                                 array_push ( $last_tag_history , '' );
 755                         }
 756                         else if ( $first_character === '|' || $first_character === '!' || substr ( $line , 0 , 2 )  === '|+' ) {
 757                                 // This might be cell elements, td, th or captions
 758                                 if ( substr ( $line , 0 , 2 ) === '|+' ) {
 759                                         $first_character = '+';
 760                                         $line = substr ( $line , 1 );
 761                                 }
 762
 763                                 $line = substr ( $line , 1 );
 764
 765                                 if ( $first_character === '!' ) {
 766                                         $line = str_replace ( '!!' , '||' , $line );
 767                                 }
 768
 769                                 // Split up multiple cells on the same line.
 770                                 // FIXME : This can result in improper nesting of tags processed
 771                                 // by earlier parser steps, but should avoid splitting up eg
 772                                 // attribute values containing literal "||".
 773                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 774
 775                                 $outLine = '';
 776
 777                                 // Loop through each table cell
 778                                 foreach ( $cells as $cell )
 779                                 {
 780                                         $previous = '';
 781                                         if ( $first_character !== '+' )
 782                                         {
 783                                                 $tr_after = array_pop ( $tr_attributes );
 784                                                 if ( !array_pop ( $tr_history ) ) {
 785                                                         $previous = "<tr{$tr_after}>\n";
 786                                                 }
 787                                                 array_push ( $tr_history , true );
 788                                                 array_push ( $tr_attributes , '' );
 789                                                 array_pop ( $has_opened_tr );
 790                                                 array_push ( $has_opened_tr , true );
 791                                         }
 792
 793                                         $last_tag = array_pop ( $last_tag_history );
 794
 795                                         if ( array_pop ( $td_history ) ) {
 796                                                 $previous = "</{$last_tag}>{$previous}";
 797                                         }
 798
 799                                         if ( $first_character === '|' ) {
 800                                                 $last_tag = 'td';
 801                                         } else if ( $first_character === '!' ) {
 802                                                 $last_tag = 'th';
 803                                         } else if ( $first_character === '+' ) {
 804                                                 $last_tag = 'caption';
 805                                         } else {
 806                                                 $last_tag = '';
 807                                         }
 808
 809                                         array_push ( $last_tag_history , $last_tag );
 810
 811                                         // A cell could contain both parameters and data
 812                                         $cell_data = explode ( '|' , $cell , 2 );
 813
 814                                         // Bug 553: Note that a '|' inside an invalid link should not
 815                                         // be mistaken as delimiting cell parameters
 816                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 817                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 818                                         } else if ( count ( $cell_data ) == 1 )
 819                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 820                                         else {
 821                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 822                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 823                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 824                                         }
 825
 826                                         $outLine .= $cell;
 827                                         array_push ( $td_history , true );
 828                                 }
 829                         }
 830                         $out .= $outLine . "\n";
 831                 }
 832
 833                 // Closing open td, tr && table
 834                 while ( count ( $td_history ) > 0 )
 835                 {
 836                         if ( array_pop ( $td_history ) ) {
 837                                 $out .= "</td>\n";
 838                         }
 839                         if ( array_pop ( $tr_history ) ) {
 840                                 $out .= "</tr>\n";
 841                         }
 842                         if ( !array_pop ( $has_opened_tr ) ) {
 843                                 $out .= "<tr><td></td></tr>\n" ;
 844                         }
 845
 846                         $out .= "</table>\n";
 847                 }
 848
 849                 // Remove trailing line-ending (b/c)
 850                 if ( substr( $out, -1 ) === "\n" ) {
 851                         $out = substr( $out, 0, -1 );
 852                 }
 853
 854                 // special case: don't return empty table
 855                 if( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 856                         $out = '';
 857                 }
 858
 859                 wfProfileOut( __METHOD__ );
 860
 861                 return $out;
 862         }
 863
 864         /**
 865          * Helper function for parse() that transforms wiki markup into
 866          * HTML. Only called for $mOutputType == self::OT_HTML.
 867          *
 868          * @private
 869          */
 870         function internalParse( $text, $isMain = true, $frame=false ) {
 871                 wfProfileIn( __METHOD__ );
 872
 873                 $origText = $text;
 874
 875                 # Hook to suspend the parser in this state
 876                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 877                         wfProfileOut( __METHOD__ );
 878                         return $text ;
 879                 }
 880
 881                 // if $frame is provided, then use $frame for replacing any variables
 882                 if ($frame) {
 883                         // use frame depth to infer how include/noinclude tags should be handled
 884                         // depth=0 means this is the top-level document; otherwise it's an included document
 885                         if( !$frame->depth )
 886                                 $flag = 0;
 887                         else
 888                                 $flag = Parser::PTD_FOR_INCLUSION;
 889                         $dom = $this->preprocessToDom( $text, $flag );
 890                         $text = $frame->expand( $dom );
 891                 }
 892                 // if $frame is not provided, then use old-style replaceVariables
 893                 else {
 894                         $text = $this->replaceVariables( $text );
 895                 }
 896
 897                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 898                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 899
 900                 // Tables need to come after variable replacement for things to work
 901                 // properly; putting them before other transformations should keep
 902                 // exciting things like link expansions from showing up in surprising
 903                 // places.
 904                 $text = $this->doTableStuff( $text );
 905
 906                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 907
 908                 $text = $this->doDoubleUnderscore( $text );
 909                 $text = $this->doHeadings( $text );
 910                 if( $this->mOptions->getUseDynamicDates() ) {
 911                         $df = DateFormatter::getInstance();
 912                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 913                 }
 914                 $text = $this->doAllQuotes( $text );
 915                 $text = $this->replaceInternalLinks( $text );
 916                 $text = $this->replaceExternalLinks( $text );
 917
 918                 # replaceInternalLinks may sometimes leave behind
 919                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 920                 $text = str_replace($this->mUniqPrefix.'NOPARSE', '', $text);
 921
 922                 $text = $this->doMagicLinks( $text );
 923                 $text = $this->formatHeadings( $text, $origText, $isMain );
 924
 925                 wfProfileOut( __METHOD__ );
 926                 return $text;
 927         }
 928
 929         /**
 930          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 931          * magic external links.
 932          *
 933          * DML
 934          * @private
 935          */
 936         function doMagicLinks( $text ) {
 937                 wfProfileIn( __METHOD__ );
 938                 $prots = $this->mUrlProtocols;
 939                 $urlChar = self::EXT_LINK_URL_CLASS;
 940                 $text = preg_replace_callback(
 941                         '!(?:                           # Start cases
 942                                 (<a.*?</a>) |               # m[1]: Skip link text
 943                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
 944                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
 945                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
 946                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
 947                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 948                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 949                                     [0-9Xx]                 # check digit
 950                                     \b)
 951                         )!x', array( &$this, 'magicLinkCallback' ), $text );
 952                 wfProfileOut( __METHOD__ );
 953                 return $text;
 954         }
 955
 956         function magicLinkCallback( $m ) {
 957                 if ( isset( $m[1] ) && $m[1] !== '' ) {
 958                         # Skip anchor
 959                         return $m[0];
 960                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
 961                         # Skip HTML element
 962                         return $m[0];
 963                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
 964                         # Free external link
 965                         return $this->makeFreeExternalLink( $m[0] );
 966                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
 967                         # RFC or PMID
 968                         $CssClass = '';
 969                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
 970                                 $keyword = 'RFC';
 971                                 $urlmsg = 'rfcurl';
 972                                 $CssClass = 'mw-magiclink-rfc';
 973                                 $id = $m[4];
 974                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
 975                                 $keyword = 'PMID';
 976                                 $urlmsg = 'pubmedurl';
 977                                 $CssClass = 'mw-magiclink-pmid';
 978                                 $id = $m[4];
 979                         } else {
 980                                 throw new MWException( __METHOD__.': unrecognised match type "' .
 981                                         substr($m[0], 0, 20 ) . '"' );
 982                         }
 983                         $url = wfMsg( $urlmsg, $id);
 984                         $sk = $this->mOptions->getSkin();
 985                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
 986                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
 987                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
 988                         # ISBN
 989                         $isbn = $m[5];
 990                         $num = strtr( $isbn, array(
 991                                 '-' => '',
 992                                 ' ' => '',
 993                                 'x' => 'X',
 994                         ));
 995                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
 996                         return'<a href="' .
 997                                 $titleObj->escapeLocalUrl() .
 998                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
 999                 } else {
1000                         return $m[0];
1001                 }
1002         }
1003
1004         /**
1005          * Make a free external link, given a user-supplied URL
1006          * @return HTML
1007          * @private
1008          */
1009         function makeFreeExternalLink( $url ) {
1010                 global $wgContLang;
1011                 wfProfileIn( __METHOD__ );
1012
1013                 $sk = $this->mOptions->getSkin();
1014                 $trail = '';
1015
1016                 # The characters '<' and '>' (which were escaped by
1017                 # removeHTMLtags()) should not be included in
1018                 # URLs, per RFC 2396.
1019                 $m2 = array();
1020                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1021                         $trail = substr($url, $m2[0][1]) . $trail;
1022                         $url = substr($url, 0, $m2[0][1]);
1023                 }
1024
1025                 # Move trailing punctuation to $trail
1026                 $sep = ',;\.:!?';
1027                 # If there is no left bracket, then consider right brackets fair game too
1028                 if ( strpos( $url, '(' ) === false ) {
1029                         $sep .= ')';
1030                 }
1031
1032                 $numSepChars = strspn( strrev( $url ), $sep );
1033                 if ( $numSepChars ) {
1034                         $trail = substr( $url, -$numSepChars ) . $trail;
1035                         $url = substr( $url, 0, -$numSepChars );
1036                 }
1037
1038                 $url = Sanitizer::cleanUrl( $url );
1039
1040                 # Is this an external image?
1041                 $text = $this->maybeMakeExternalImage( $url );
1042                 if ( $text === false ) {
1043                         # Not an image, make a link
1044                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1045                                 $this->getExternalLinkAttribs( $url ) );
1046                         # Register it in the output object...
1047                         # Replace unnecessary URL escape codes with their equivalent characters
1048                         $pasteurized = self::replaceUnusualEscapes( $url );
1049                         $this->mOutput->addExternalLink( $pasteurized );
1050                 }
1051                 wfProfileOut( __METHOD__ );
1052                 return $text . $trail;
1053         }
1054
1055
1056         /**
1057          * Parse headers and return html
1058          *
1059          * @private
1060          */
1061         function doHeadings( $text ) {
1062                 wfProfileIn( __METHOD__ );
1063                 for ( $i = 6; $i >= 1; --$i ) {
1064                         $h = str_repeat( '=', $i );
1065                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1066                           "<h$i>\\1</h$i>", $text );
1067                 }
1068                 wfProfileOut( __METHOD__ );
1069                 return $text;
1070         }
1071
1072         /**
1073          * Replace single quotes with HTML markup
1074          * @private
1075          * @return string the altered text
1076          */
1077         function doAllQuotes( $text ) {
1078                 wfProfileIn( __METHOD__ );
1079                 $outtext = '';
1080                 $lines = StringUtils::explode( "\n", $text );
1081                 foreach ( $lines as $line ) {
1082                         $outtext .= $this->doQuotes( $line ) . "\n";
1083                 }
1084                 $outtext = substr($outtext, 0,-1);
1085                 wfProfileOut( __METHOD__ );
1086                 return $outtext;
1087         }
1088
1089         /**
1090          * Helper function for doAllQuotes()
1091          */
1092         public function doQuotes( $text ) {
1093                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1094                 if ( count( $arr ) == 1 )
1095                         return $text;
1096                 else
1097                 {
1098                         # First, do some preliminary work. This may shift some apostrophes from
1099                         # being mark-up to being text. It also counts the number of occurrences
1100                         # of bold and italics mark-ups.
1101                         $i = 0;
1102                         $numbold = 0;
1103                         $numitalics = 0;
1104                         foreach ( $arr as $r )
1105                         {
1106                                 if ( ( $i % 2 ) == 1 )
1107                                 {
1108                                         # If there are ever four apostrophes, assume the first is supposed to
1109                                         # be text, and the remaining three constitute mark-up for bold text.
1110                                         if ( strlen( $arr[$i] ) == 4 )
1111                                         {
1112                                                 $arr[$i-1] .= "'";
1113                                                 $arr[$i] = "'''";
1114                                         }
1115                                         # If there are more than 5 apostrophes in a row, assume they're all
1116                                         # text except for the last 5.
1117                                         else if ( strlen( $arr[$i] ) > 5 )
1118                                         {
1119                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1120                                                 $arr[$i] = "'''''";
1121                                         }
1122                                         # Count the number of occurrences of bold and italics mark-ups.
1123                                         # We are not counting sequences of five apostrophes.
1124                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1125                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1126                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1127                                 }
1128                                 $i++;
1129                         }
1130
1131                         # If there is an odd number of both bold and italics, it is likely
1132                         # that one of the bold ones was meant to be an apostrophe followed
1133                         # by italics. Which one we cannot know for certain, but it is more
1134                         # likely to be one that has a single-letter word before it.
1135                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1136                         {
1137                                 $i = 0;
1138                                 $firstsingleletterword = -1;
1139                                 $firstmultiletterword = -1;
1140                                 $firstspace = -1;
1141                                 foreach ( $arr as $r )
1142                                 {
1143                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1144                                         {
1145                                                 $x1 = substr ($arr[$i-1], -1);
1146                                                 $x2 = substr ($arr[$i-1], -2, 1);
1147                                                 if ($x1 === ' ') {
1148                                                         if ($firstspace == -1) $firstspace = $i;
1149                                                 } else if ($x2 === ' ') {
1150                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1151                                                 } else {
1152                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1153                                                 }
1154                                         }
1155                                         $i++;
1156                                 }
1157
1158                                 # If there is a single-letter word, use it!
1159                                 if ($firstsingleletterword > -1)
1160                                 {
1161                                         $arr [ $firstsingleletterword ] = "''";
1162                                         $arr [ $firstsingleletterword-1 ] .= "'";
1163                                 }
1164                                 # If not, but there's a multi-letter word, use that one.
1165                                 else if ($firstmultiletterword > -1)
1166                                 {
1167                                         $arr [ $firstmultiletterword ] = "''";
1168                                         $arr [ $firstmultiletterword-1 ] .= "'";
1169                                 }
1170                                 # ... otherwise use the first one that has neither.
1171                                 # (notice that it is possible for all three to be -1 if, for example,
1172                                 # there is only one pentuple-apostrophe in the line)
1173                                 else if ($firstspace > -1)
1174                                 {
1175                                         $arr [ $firstspace ] = "''";
1176                                         $arr [ $firstspace-1 ] .= "'";
1177                                 }
1178                         }
1179
1180                         # Now let's actually convert our apostrophic mush to HTML!
1181                         $output = '';
1182                         $buffer = '';
1183                         $state = '';
1184                         $i = 0;
1185                         foreach ($arr as $r)
1186                         {
1187                                 if (($i % 2) == 0)
1188                                 {
1189                                         if ($state === 'both')
1190                                                 $buffer .= $r;
1191                                         else
1192                                                 $output .= $r;
1193                                 }
1194                                 else
1195                                 {
1196                                         if (strlen ($r) == 2)
1197                                         {
1198                                                 if ($state === 'i')
1199                                                 { $output .= '</i>'; $state = ''; }
1200                                                 else if ($state === 'bi')
1201                                                 { $output .= '</i>'; $state = 'b'; }
1202                                                 else if ($state === 'ib')
1203                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1204                                                 else if ($state === 'both')
1205                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1206                                                 else # $state can be 'b' or ''
1207                                                 { $output .= '<i>'; $state .= 'i'; }
1208                                         }
1209                                         else if (strlen ($r) == 3)
1210                                         {
1211                                                 if ($state === 'b')
1212                                                 { $output .= '</b>'; $state = ''; }
1213                                                 else if ($state === 'bi')
1214                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1215                                                 else if ($state === 'ib')
1216                                                 { $output .= '</b>'; $state = 'i'; }
1217                                                 else if ($state === 'both')
1218                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1219                                                 else # $state can be 'i' or ''
1220                                                 { $output .= '<b>'; $state .= 'b'; }
1221                                         }
1222                                         else if (strlen ($r) == 5)
1223                                         {
1224                                                 if ($state === 'b')
1225                                                 { $output .= '</b><i>'; $state = 'i'; }
1226                                                 else if ($state === 'i')
1227                                                 { $output .= '</i><b>'; $state = 'b'; }
1228                                                 else if ($state === 'bi')
1229                                                 { $output .= '</i></b>'; $state = ''; }
1230                                                 else if ($state === 'ib')
1231                                                 { $output .= '</b></i>'; $state = ''; }
1232                                                 else if ($state === 'both')
1233                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1234                                                 else # ($state == '')
1235                                                 { $buffer = ''; $state = 'both'; }
1236                                         }
1237                                 }
1238                                 $i++;
1239                         }
1240                         # Now close all remaining tags.  Notice that the order is important.
1241                         if ($state === 'b' || $state === 'ib')
1242                                 $output .= '</b>';
1243                         if ($state === 'i' || $state === 'bi' || $state === 'ib')
1244                                 $output .= '</i>';
1245                         if ($state === 'bi')
1246                                 $output .= '</b>';
1247                         # There might be lonely ''''', so make sure we have a buffer
1248                         if ($state === 'both' && $buffer)
1249                                 $output .= '<b><i>'.$buffer.'</i></b>';
1250                         return $output;
1251                 }
1252         }
1253
1254         /**
1255          * Replace external links (REL)
1256          *
1257          * Note: this is all very hackish and the order of execution matters a lot.
1258          * Make sure to run maintenance/parserTests.php if you change this code.
1259          *
1260          * @private
1261          */
1262         function replaceExternalLinks( $text ) {
1263                 global $wgContLang;
1264                 wfProfileIn( __METHOD__ );
1265
1266                 $sk = $this->mOptions->getSkin();
1267
1268                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1269                 $s = array_shift( $bits );
1270
1271                 $i = 0;
1272                 while ( $i<count( $bits ) ) {
1273                         $url = $bits[$i++];
1274                         $protocol = $bits[$i++];
1275                         $text = $bits[$i++];
1276                         $trail = $bits[$i++];
1277
1278                         # The characters '<' and '>' (which were escaped by
1279                         # removeHTMLtags()) should not be included in
1280                         # URLs, per RFC 2396.
1281                         $m2 = array();
1282                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1283                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1284                                 $url = substr($url, 0, $m2[0][1]);
1285                         }
1286
1287                         # If the link text is an image URL, replace it with an <img> tag
1288                         # This happened by accident in the original parser, but some people used it extensively
1289                         $img = $this->maybeMakeExternalImage( $text );
1290                         if ( $img !== false ) {
1291                                 $text = $img;
1292                         }
1293
1294                         $dtrail = '';
1295
1296                         # Set linktype for CSS - if URL==text, link is essentially free
1297                         $linktype = ($text === $url) ? 'free' : 'text';
1298
1299                         # No link text, e.g. [http://domain.tld/some.link]
1300                         if ( $text == '' ) {
1301                                 # Autonumber if allowed. See bug #5918
1302                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1303                                         $langObj = $this->getFunctionLang();
1304                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1305                                         $linktype = 'autonumber';
1306                                 } else {
1307                                         # Otherwise just use the URL
1308                                         $text = htmlspecialchars( $url );
1309                                         $linktype = 'free';
1310                                 }
1311                         } else {
1312                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1313                                 # Check for trail
1314                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1315                         }
1316
1317                         $text = $wgContLang->markNoConversion($text);
1318
1319                         $url = Sanitizer::cleanUrl( $url );
1320
1321                         # Use the encoded URL
1322                         # This means that users can paste URLs directly into the text
1323                         # Funny characters like &ouml; aren't valid in URLs anyway
1324                         # This was changed in August 2004
1325                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1326                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1327
1328                         # Register link in the output object.
1329                         # Replace unnecessary URL escape codes with the referenced character
1330                         # This prevents spammers from hiding links from the filters
1331                         $pasteurized = self::replaceUnusualEscapes( $url );
1332                         $this->mOutput->addExternalLink( $pasteurized );
1333                 }
1334
1335                 wfProfileOut( __METHOD__ );
1336                 return $s;
1337         }
1338
1339         /**
1340          * Get an associative array of additional HTML attributes appropriate for a
1341          * particular external link.  This currently may include rel => nofollow
1342          * (depending on configuration, namespace, and the URL's domain) and/or a
1343          * target attribute (depending on configuration).
1344          *
1345          * @param string $url Optional URL, to extract the domain from for rel =>
1346          *   nofollow if appropriate
1347          * @return array Associative array of HTML attributes
1348          */
1349         function getExternalLinkAttribs( $url = false ) {
1350                 $attribs = array();
1351                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1352                 $ns = $this->mTitle->getNamespace();
1353                 if( $wgNoFollowLinks && !in_array($ns, $wgNoFollowNsExceptions) ) {
1354                         $attribs['rel'] = 'nofollow';
1355
1356                         global $wgNoFollowDomainExceptions;
1357                         if ( $wgNoFollowDomainExceptions ) {
1358                                 $bits = wfParseUrl( $url );
1359                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1360                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1361                                                 if( substr( $bits['host'], -strlen( $domain ) )
1362                                                 == $domain ) {
1363                                                         unset( $attribs['rel'] );
1364                                                         break;
1365                                                 }
1366                                         }
1367                                 }
1368                         }
1369                 }
1370                 if ( $this->mOptions->getExternalLinkTarget() ) {
1371                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1372                 }
1373                 return $attribs;
1374         }
1375
1376
1377         /**
1378          * Replace unusual URL escape codes with their equivalent characters
1379          * @param string
1380          * @return string
1381          * @static
1382          * @todo  This can merge genuinely required bits in the path or query string,
1383          *        breaking legit URLs. A proper fix would treat the various parts of
1384          *        the URL differently; as a workaround, just use the output for
1385          *        statistical records, not for actual linking/output.
1386          */
1387         static function replaceUnusualEscapes( $url ) {
1388                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1389                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1390         }
1391
1392         /**
1393          * Callback function used in replaceUnusualEscapes().
1394          * Replaces unusual URL escape codes with their equivalent character
1395          * @static
1396          * @private
1397          */
1398         private static function replaceUnusualEscapesCallback( $matches ) {
1399                 $char = urldecode( $matches[0] );
1400                 $ord = ord( $char );
1401                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1402                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1403                         // No, shouldn't be escaped
1404                         return $char;
1405                 } else {
1406                         // Yes, leave it escaped
1407                         return $matches[0];
1408                 }
1409         }
1410
1411         /**
1412          * make an image if it's allowed, either through the global
1413          * option, through the exception, or through the on-wiki whitelist
1414          * @private
1415          */
1416         function maybeMakeExternalImage( $url ) {
1417                 $sk = $this->mOptions->getSkin();
1418                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1419                 $imagesexception = !empty($imagesfrom);
1420                 $text = false;
1421                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1422                 if( $imagesexception && is_array( $imagesfrom ) ) {
1423                         $imagematch = false;
1424                         foreach( $imagesfrom as $match ) {
1425                                 if( strpos( $url, $match ) === 0 ) {
1426                                         $imagematch = true;
1427                                         break;
1428                                 }
1429                         }
1430                 } elseif( $imagesexception ) {
1431                         $imagematch = (strpos( $url, $imagesfrom ) === 0);
1432                 } else {
1433                         $imagematch = false;
1434                 }
1435                 if ( $this->mOptions->getAllowExternalImages()
1436                      || ( $imagesexception && $imagematch ) ) {
1437                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1438                                 # Image found
1439                                 $text = $sk->makeExternalImage( $url );
1440                         }
1441                 }
1442                 if( !$text && $this->mOptions->getEnableImageWhitelist()
1443                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1444                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1445                         foreach( $whitelist as $entry ) {
1446                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1447                                 if( strpos( $entry, '#' ) === 0 || $entry === '' )
1448                                         continue;
1449                                 if( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1450                                         # Image matches a whitelist entry
1451                                         $text = $sk->makeExternalImage( $url );
1452                                         break;
1453                                 }
1454                         }
1455                 }
1456                 return $text;
1457         }
1458
1459         /**
1460          * Process [[ ]] wikilinks
1461          * @return processed text
1462          *
1463          * @private
1464          */
1465         function replaceInternalLinks( $s ) {
1466                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1467                 return $s;
1468         }
1469
1470         /**
1471          * Process [[ ]] wikilinks (RIL)
1472          * @return LinkHolderArray
1473          *
1474          * @private
1475          */
1476         function replaceInternalLinks2( &$s ) {
1477                 global $wgContLang;
1478
1479                 wfProfileIn( __METHOD__ );
1480
1481                 wfProfileIn( __METHOD__.'-setup' );
1482                 static $tc = FALSE, $e1, $e1_img;
1483                 # the % is needed to support urlencoded titles as well
1484                 if ( !$tc ) {
1485                         $tc = Title::legalChars() . '#%';
1486                         # Match a link having the form [[namespace:link|alternate]]trail
1487                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1488                         # Match cases where there is no "]]", which might still be images
1489                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1490                 }
1491
1492                 $sk = $this->mOptions->getSkin();
1493                 $holders = new LinkHolderArray( $this );
1494
1495                 #split the entire text string on occurences of [[
1496                 $a = StringUtils::explode( '[[', ' ' . $s );
1497                 #get the first element (all text up to first [[), and remove the space we added
1498                 $s = $a->current();
1499                 $a->next();
1500                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1501                 $s = substr( $s, 1 );
1502
1503                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1504                 $e2 = null;
1505                 if ( $useLinkPrefixExtension ) {
1506                         # Match the end of a line for a word that's not followed by whitespace,
1507                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1508                         $e2 = wfMsgForContent( 'linkprefix' );
1509                 }
1510
1511                 if( is_null( $this->mTitle ) ) {
1512                         wfProfileOut( __METHOD__.'-setup' );
1513                         wfProfileOut( __METHOD__ );
1514                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1515                 }
1516                 $nottalk = !$this->mTitle->isTalkPage();
1517
1518                 if ( $useLinkPrefixExtension ) {
1519                         $m = array();
1520                         if ( preg_match( $e2, $s, $m ) ) {
1521                                 $first_prefix = $m[2];
1522                         } else {
1523                                 $first_prefix = false;
1524                         }
1525                 } else {
1526                         $prefix = '';
1527                 }
1528
1529                 if($wgContLang->hasVariants()) {
1530                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1531                 } else {
1532                         $selflink = array($this->mTitle->getPrefixedText());
1533                 }
1534                 $useSubpages = $this->areSubpagesAllowed();
1535                 wfProfileOut( __METHOD__.'-setup' );
1536
1537                 # Loop for each link
1538                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1539                         # Check for excessive memory usage
1540                         if ( $holders->isBig() ) {
1541                                 # Too big
1542                                 # Do the existence check, replace the link holders and clear the array
1543                                 $holders->replace( $s );
1544                                 $holders->clear();
1545                         }
1546
1547                         if ( $useLinkPrefixExtension ) {
1548                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1549                                 if ( preg_match( $e2, $s, $m ) ) {
1550                                         $prefix = $m[2];
1551                                         $s = $m[1];
1552                                 } else {
1553                                         $prefix='';
1554                                 }
1555                                 # first link
1556                                 if($first_prefix) {
1557                                         $prefix = $first_prefix;
1558                                         $first_prefix = false;
1559                                 }
1560                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1561                         }
1562
1563                         $might_be_img = false;
1564
1565                         wfProfileIn( __METHOD__."-e1" );
1566                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1567                                 $text = $m[2];
1568                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1569                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1570                                 # the real problem is with the $e1 regex
1571                                 # See bug 1300.
1572                                 #
1573                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1574                                 # and no image is in sight. See bug 2095.
1575                                 #
1576                                 if( $text !== '' &&
1577                                         substr( $m[3], 0, 1 ) === ']' &&
1578                                         strpos($text, '[') !== false
1579                                 )
1580                                 {
1581                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1582                                         $m[3] = substr( $m[3], 1 );
1583                                 }
1584                                 # fix up urlencoded title texts
1585                                 if( strpos( $m[1], '%' ) !== false ) {
1586                                         # Should anchors '#' also be rejected?
1587                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1588                                 }
1589                                 $trail = $m[3];
1590                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1591                                 $might_be_img = true;
1592                                 $text = $m[2];
1593                                 if ( strpos( $m[1], '%' ) !== false ) {
1594                                         $m[1] = urldecode($m[1]);
1595                                 }
1596                                 $trail = "";
1597                         } else { # Invalid form; output directly
1598                                 $s .= $prefix . '[[' . $line ;
1599                                 wfProfileOut( __METHOD__."-e1" );
1600                                 continue;
1601                         }
1602                         wfProfileOut( __METHOD__."-e1" );
1603                         wfProfileIn( __METHOD__."-misc" );
1604
1605                         # Don't allow internal links to pages containing
1606                         # PROTO: where PROTO is a valid URL protocol; these
1607                         # should be external links.
1608                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1609                                 $s .= $prefix . '[[' . $line ;
1610                                 wfProfileOut( __METHOD__."-misc" );
1611                                 continue;
1612                         }
1613
1614                         # Make subpage if necessary
1615                         if ( $useSubpages ) {
1616                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1617                         } else {
1618                                 $link = $m[1];
1619                         }
1620
1621                         $noforce = (substr( $m[1], 0, 1 ) !== ':');
1622                         if (!$noforce) {
1623                                 # Strip off leading ':'
1624                                 $link = substr( $link, 1 );
1625                         }
1626
1627                         wfProfileOut( __METHOD__."-misc" );
1628                         wfProfileIn( __METHOD__."-title" );
1629                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1630                         if ( $nt === NULL ) {
1631                                 $s .= $prefix . '[[' . $line;
1632                                 wfProfileOut( __METHOD__."-title" );
1633                                 continue;
1634                         }
1635
1636                         $ns = $nt->getNamespace();
1637                         $iw = $nt->getInterWiki();
1638                         wfProfileOut( __METHOD__."-title" );
1639
1640                         if ( $might_be_img ) { # if this is actually an invalid link
1641                                 wfProfileIn( __METHOD__."-might_be_img" );
1642                                 if ( $ns == NS_FILE && $noforce ) { #but might be an image
1643                                         $found = false;
1644                                         while ( true ) {
1645                                                 #look at the next 'line' to see if we can close it there
1646                                                 $a->next();
1647                                                 $next_line = $a->current();
1648                                                 if ( $next_line === false || $next_line === null ) {
1649                                                         break;
1650                                                 }
1651                                                 $m = explode( ']]', $next_line, 3 );
1652                                                 if ( count( $m ) == 3 ) {
1653                                                         # the first ]] closes the inner link, the second the image
1654                                                         $found = true;
1655                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1656                                                         $trail = $m[2];
1657                                                         break;
1658                                                 } elseif ( count( $m ) == 2 ) {
1659                                                         #if there's exactly one ]] that's fine, we'll keep looking
1660                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1661                                                 } else {
1662                                                         #if $next_line is invalid too, we need look no further
1663                                                         $text .= '[[' . $next_line;
1664                                                         break;
1665                                                 }
1666                                         }
1667                                         if ( !$found ) {
1668                                                 # we couldn't find the end of this imageLink, so output it raw
1669                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1670                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1671                                                 $s .= "{$prefix}[[$link|$text";
1672                                                 # note: no $trail, because without an end, there *is* no trail
1673                                                 wfProfileOut( __METHOD__."-might_be_img" );
1674                                                 continue;
1675                                         }
1676                                 } else { #it's not an image, so output it raw
1677                                         $s .= "{$prefix}[[$link|$text";
1678                                         # note: no $trail, because without an end, there *is* no trail
1679                                         wfProfileOut( __METHOD__."-might_be_img" );
1680                                         continue;
1681                                 }
1682                                 wfProfileOut( __METHOD__."-might_be_img" );
1683                         }
1684
1685                         $wasblank = ( '' == $text );
1686                         if ( $wasblank ) $text = $link;
1687
1688                         # Link not escaped by : , create the various objects
1689                         if ( $noforce ) {
1690
1691                                 # Interwikis
1692                                 wfProfileIn( __METHOD__."-interwiki" );
1693                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1694                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1695                                         $s = rtrim($s . $prefix);
1696                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1697                                         wfProfileOut( __METHOD__."-interwiki" );
1698                                         continue;
1699                                 }
1700                                 wfProfileOut( __METHOD__."-interwiki" );
1701
1702                                 if ( $ns == NS_FILE ) {
1703                                         wfProfileIn( __METHOD__."-image" );
1704                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1705                                                 if ( $wasblank ) {
1706                                                         # if no parameters were passed, $text
1707                                                         # becomes something like "File:Foo.png",
1708                                                         # which we don't want to pass on to the
1709                                                         # image generator
1710                                                         $text = '';
1711                                                 } else {
1712                                                         # recursively parse links inside the image caption
1713                                                         # actually, this will parse them in any other parameters, too,
1714                                                         # but it might be hard to fix that, and it doesn't matter ATM
1715                                                         $text = $this->replaceExternalLinks($text);
1716                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1717                                                 }
1718                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1719                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1720                                         }
1721                                         $this->mOutput->addImage( $nt->getDBkey() );
1722                                         wfProfileOut( __METHOD__."-image" );
1723                                         continue;
1724
1725                                 }
1726
1727                                 if ( $ns == NS_CATEGORY ) {
1728                                         wfProfileIn( __METHOD__."-category" );
1729                                         $s = rtrim($s . "\n"); # bug 87
1730
1731                                         if ( $wasblank ) {
1732                                                 $sortkey = $this->getDefaultSort();
1733                                         } else {
1734                                                 $sortkey = $text;
1735                                         }
1736                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1737                                         $sortkey = str_replace( "\n", '', $sortkey );
1738                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1739                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1740
1741                                         /**
1742                                          * Strip the whitespace Category links produce, see bug 87
1743                                          * @todo We might want to use trim($tmp, "\n") here.
1744                                          */
1745                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1746
1747                                         wfProfileOut( __METHOD__."-category" );
1748                                         continue;
1749                                 }
1750                         }
1751
1752                         # Self-link checking
1753                         if( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1754                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1755                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1756                                         continue;
1757                                 }
1758                         }
1759
1760                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1761                         # FIXME: Should do batch file existence checks, see comment below
1762                         if( $ns == NS_MEDIA ) {
1763                                 wfProfileIn( __METHOD__."-media" );
1764                                 # Give extensions a chance to select the file revision for us
1765                                 $skip = $time = false;
1766                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1767                                 if ( $skip ) {
1768                                         $link = $sk->link( $nt );
1769                                 } else {
1770                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1771                                 }
1772                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1773                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1774                                 $this->mOutput->addImage( $nt->getDBkey() );
1775                                 wfProfileOut( __METHOD__."-media" );
1776                                 continue;
1777                         }
1778
1779                         wfProfileIn( __METHOD__."-always_known" );
1780                         # Some titles, such as valid special pages or files in foreign repos, should
1781                         # be shown as bluelinks even though they're not included in the page table
1782                         #
1783                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1784                         # batch file existence checks for NS_FILE and NS_MEDIA
1785                         if( $iw == '' && $nt->isAlwaysKnown() ) {
1786                                 $this->mOutput->addLink( $nt );
1787                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1788                         } else {
1789                                 # Links will be added to the output link list after checking
1790                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1791                         }
1792                         wfProfileOut( __METHOD__."-always_known" );
1793                 }
1794                 wfProfileOut( __METHOD__ );
1795                 return $holders;
1796         }
1797
1798         /**
1799          * Make a link placeholder. The text returned can be later resolved to a real link with
1800          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1801          * parsing of interwiki links, and secondly to allow all existence checks and
1802          * article length checks (for stub links) to be bundled into a single query.
1803          *
1804          * @deprecated
1805          */
1806         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1807                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1808         }
1809
1810         /**
1811          * Render a forced-blue link inline; protect against double expansion of
1812          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1813          * Since this little disaster has to split off the trail text to avoid
1814          * breaking URLs in the following text without breaking trails on the
1815          * wiki links, it's been made into a horrible function.
1816          *
1817          * @param Title $nt
1818          * @param string $text
1819          * @param string $query
1820          * @param string $trail
1821          * @param string $prefix
1822          * @return string HTML-wikitext mix oh yuck
1823          */
1824         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1825                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1826                 $sk = $this->mOptions->getSkin();
1827                 // FIXME: use link() instead of deprecated makeKnownLinkObj()
1828                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1829                 return $this->armorLinks( $link ) . $trail;
1830         }
1831
1832         /**
1833          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1834          * going to go through further parsing steps before inline URL expansion.
1835          *
1836          * Not needed quite as much as it used to be since free links are a bit
1837          * more sensible these days. But bracketed links are still an issue.
1838          *
1839          * @param string more-or-less HTML
1840          * @return string less-or-more HTML with NOPARSE bits
1841          */
1842         function armorLinks( $text ) {
1843                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1844                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1845         }
1846
1847         /**
1848          * Return true if subpage links should be expanded on this page.
1849          * @return bool
1850          */
1851         function areSubpagesAllowed() {
1852                 # Some namespaces don't allow subpages
1853                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1854         }
1855
1856         /**
1857          * Handle link to subpage if necessary
1858          * @param string $target the source of the link
1859          * @param string &$text the link text, modified as necessary
1860          * @return string the full name of the link
1861          * @private
1862          */
1863         function maybeDoSubpageLink($target, &$text) {
1864                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1865         }
1866
1867         /**#@+
1868          * Used by doBlockLevels()
1869          * @private
1870          */
1871         /* private */ function closeParagraph() {
1872                 $result = '';
1873                 if ( '' != $this->mLastSection ) {
1874                         $result = '</' . $this->mLastSection  . ">\n";
1875                 }
1876                 $this->mInPre = false;
1877                 $this->mLastSection = '';
1878                 return $result;
1879         }
1880         # getCommon() returns the length of the longest common substring
1881         # of both arguments, starting at the beginning of both.
1882         #
1883         /* private */ function getCommon( $st1, $st2 ) {
1884                 $fl = strlen( $st1 );
1885                 $shorter = strlen( $st2 );
1886                 if ( $fl < $shorter ) { $shorter = $fl; }
1887
1888                 for ( $i = 0; $i < $shorter; ++$i ) {
1889                         if ( $st1{$i} != $st2{$i} ) { break; }
1890                 }
1891                 return $i;
1892         }
1893         # These next three functions open, continue, and close the list
1894         # element appropriate to the prefix character passed into them.
1895         #
1896         /* private */ function openList( $char ) {
1897                 $result = $this->closeParagraph();
1898
1899                 if ( '*' === $char ) { $result .= '<ul><li>'; }
1900                 elseif ( '#' === $char ) { $result .= '<ol><li>'; }
1901                 elseif ( ':' === $char ) { $result .= '<dl><dd>'; }
1902                 elseif ( ';' === $char ) {
1903                         $result .= '<dl><dt>';
1904                         $this->mDTopen = true;
1905                 }
1906                 else { $result = '<!-- ERR 1 -->'; }
1907
1908                 return $result;
1909         }
1910
1911         /* private */ function nextItem( $char ) {
1912                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
1913                 elseif ( ':' === $char || ';' === $char ) {
1914                         $close = '</dd>';
1915                         if ( $this->mDTopen ) { $close = '</dt>'; }
1916                         if ( ';' === $char ) {
1917                                 $this->mDTopen = true;
1918                                 return $close . '<dt>';
1919                         } else {
1920                                 $this->mDTopen = false;
1921                                 return $close . '<dd>';
1922                         }
1923                 }
1924                 return '<!-- ERR 2 -->';
1925         }
1926
1927         /* private */ function closeList( $char ) {
1928                 if ( '*' === $char ) { $text = '</li></ul>'; }
1929                 elseif ( '#' === $char ) { $text = '</li></ol>'; }
1930                 elseif ( ':' === $char ) {
1931                         if ( $this->mDTopen ) {
1932                                 $this->mDTopen = false;
1933                                 $text = '</dt></dl>';
1934                         } else {
1935                                 $text = '</dd></dl>';
1936                         }
1937                 }
1938                 else {  return '<!-- ERR 3 -->'; }
1939                 return $text."\n";
1940         }
1941         /**#@-*/
1942
1943         /**
1944          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
1945          *
1946          * @param $linestart bool whether or not this is at the start of a line.
1947          * @private
1948          * @return string the lists rendered as HTML
1949          */
1950         function doBlockLevels( $text, $linestart ) {
1951                 wfProfileIn( __METHOD__ );
1952
1953                 # Parsing through the text line by line.  The main thing
1954                 # happening here is handling of block-level elements p, pre,
1955                 # and making lists from lines starting with * # : etc.
1956                 #
1957                 $textLines = StringUtils::explode( "\n", $text );
1958
1959                 $lastPrefix = $output = '';
1960                 $this->mDTopen = $inBlockElem = false;
1961                 $prefixLength = 0;
1962                 $paragraphStack = false;
1963
1964                 foreach ( $textLines as $oLine ) {
1965                         # Fix up $linestart
1966                         if ( !$linestart ) {
1967                                 $output .= $oLine;
1968                                 $linestart = true;
1969                                 continue;
1970                         }
1971                         // * = ul
1972                         // # = ol
1973                         // ; = dt
1974                         // : = dd
1975
1976                         $lastPrefixLength = strlen( $lastPrefix );
1977                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
1978                         $preOpenMatch = preg_match('/<pre/i', $oLine );
1979                         // If not in a <pre> element, scan for and figure out what prefixes are there.
1980                         if ( !$this->mInPre ) {
1981                                 # Multiple prefixes may abut each other for nested lists.
1982                                 $prefixLength = strspn( $oLine, '*#:;' );
1983                                 $prefix = substr( $oLine, 0, $prefixLength );
1984
1985                                 # eh?
1986                                 // ; and : are both from definition-lists, so they're equivalent
1987                                 //  for the purposes of determining whether or not we need to open/close
1988                                 //  elements.
1989                                 $prefix2 = str_replace( ';', ':', $prefix );
1990                                 $t = substr( $oLine, $prefixLength );
1991                                 $this->mInPre = (bool)$preOpenMatch;
1992                         } else {
1993                                 # Don't interpret any other prefixes in preformatted text
1994                                 $prefixLength = 0;
1995                                 $prefix = $prefix2 = '';
1996                                 $t = $oLine;
1997                         }
1998
1999                         # List generation
2000                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2001                                 # Same as the last item, so no need to deal with nesting or opening stuff
2002                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2003                                 $paragraphStack = false;
2004
2005                                 if ( substr( $prefix, -1 ) === ';') {
2006                                         # The one nasty exception: definition lists work like this:
2007                                         # ; title : definition text
2008                                         # So we check for : in the remainder text to split up the
2009                                         # title and definition, without b0rking links.
2010                                         $term = $t2 = '';
2011                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2012                                                 $t = $t2;
2013                                                 $output .= $term . $this->nextItem( ':' );
2014                                         }
2015                                 }
2016                         } elseif( $prefixLength || $lastPrefixLength ) {
2017                                 // We need to open or close prefixes, or both.
2018
2019                                 # Either open or close a level...
2020                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2021                                 $paragraphStack = false;
2022
2023                                 // Close all the prefixes which aren't shared.
2024                                 while( $commonPrefixLength < $lastPrefixLength ) {
2025                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2026                                         --$lastPrefixLength;
2027                                 }
2028
2029                                 // Continue the current prefix if appropriate.
2030                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2031                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2032                                 }
2033
2034                                 // Open prefixes where appropriate.
2035                                 while ( $prefixLength > $commonPrefixLength ) {
2036                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2037                                         $output .= $this->openList( $char );
2038
2039                                         if ( ';' === $char ) {
2040                                                 # FIXME: This is dupe of code above
2041                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2042                                                         $t = $t2;
2043                                                         $output .= $term . $this->nextItem( ':' );
2044                                                 }
2045                                         }
2046                                         ++$commonPrefixLength;
2047                                 }
2048                                 $lastPrefix = $prefix2;
2049                         }
2050
2051                         // If we have no prefixes, go to paragraph mode.
2052                         if( 0 == $prefixLength ) {
2053                                 wfProfileIn( __METHOD__."-paragraph" );
2054                                 # No prefix (not in list)--go to paragraph mode
2055                                 // XXX: use a stack for nestable elements like span, table and div
2056                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2057                                 $closematch = preg_match(
2058                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2059                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2060                                 if ( $openmatch or $closematch ) {
2061                                         $paragraphStack = false;
2062                                         # TODO bug 5718: paragraph closed
2063                                         $output .= $this->closeParagraph();
2064                                         if ( $preOpenMatch and !$preCloseMatch ) {
2065                                                 $this->mInPre = true;
2066                                         }
2067                                         if ( $closematch ) {
2068                                                 $inBlockElem = false;
2069                                         } else {
2070                                                 $inBlockElem = true;
2071                                         }
2072                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2073                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2074                                                 // pre
2075                                                 if ($this->mLastSection !== 'pre') {
2076                                                         $paragraphStack = false;
2077                                                         $output .= $this->closeParagraph().'<pre>';
2078                                                         $this->mLastSection = 'pre';
2079                                                 }
2080                                                 $t = substr( $t, 1 );
2081                                         } else {
2082                                                 // paragraph
2083                                                 if ( '' == trim($t) ) {
2084                                                         if ( $paragraphStack ) {
2085                                                                 $output .= $paragraphStack.'<br />';
2086                                                                 $paragraphStack = false;
2087                                                                 $this->mLastSection = 'p';
2088                                                         } else {
2089                                                                 if ($this->mLastSection !== 'p' ) {
2090                                                                         $output .= $this->closeParagraph();
2091                                                                         $this->mLastSection = '';
2092                                                                         $paragraphStack = '<p>';
2093                                                                 } else {
2094                                                                         $paragraphStack = '</p><p>';
2095                                                                 }
2096                                                         }
2097                                                 } else {
2098                                                         if ( $paragraphStack ) {
2099                                                                 $output .= $paragraphStack;
2100                                                                 $paragraphStack = false;
2101                                                                 $this->mLastSection = 'p';
2102                                                         } else if ($this->mLastSection !== 'p') {
2103                                                                 $output .= $this->closeParagraph().'<p>';
2104                                                                 $this->mLastSection = 'p';
2105                                                         }
2106                                                 }
2107                                         }
2108                                 }
2109                                 wfProfileOut( __METHOD__."-paragraph" );
2110                         }
2111                         // somewhere above we forget to get out of pre block (bug 785)
2112                         if($preCloseMatch && $this->mInPre) {
2113                                 $this->mInPre = false;
2114                         }
2115                         if ($paragraphStack === false) {
2116                                 $output .= $t."\n";
2117                         }
2118                 }
2119                 while ( $prefixLength ) {
2120                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2121                         --$prefixLength;
2122                 }
2123                 if ( '' != $this->mLastSection ) {
2124                         $output .= '</' . $this->mLastSection . '>';
2125                         $this->mLastSection = '';
2126                 }
2127
2128                 wfProfileOut( __METHOD__ );
2129                 return $output;
2130         }
2131
2132         /**
2133          * Split up a string on ':', ignoring any occurences inside tags
2134          * to prevent illegal overlapping.
2135          * @param string $str the string to split
2136          * @param string &$before set to everything before the ':'
2137          * @param string &$after set to everything after the ':'
2138          * return string the position of the ':', or false if none found
2139          */
2140         function findColonNoLinks($str, &$before, &$after) {
2141                 wfProfileIn( __METHOD__ );
2142
2143                 $pos = strpos( $str, ':' );
2144                 if( $pos === false ) {
2145                         // Nothing to find!
2146                         wfProfileOut( __METHOD__ );
2147                         return false;
2148                 }
2149
2150                 $lt = strpos( $str, '<' );
2151                 if( $lt === false || $lt > $pos ) {
2152                         // Easy; no tag nesting to worry about
2153                         $before = substr( $str, 0, $pos );
2154                         $after = substr( $str, $pos+1 );
2155                         wfProfileOut( __METHOD__ );
2156                         return $pos;
2157                 }
2158
2159                 // Ugly state machine to walk through avoiding tags.
2160                 $state = self::COLON_STATE_TEXT;
2161                 $stack = 0;
2162                 $len = strlen( $str );
2163                 for( $i = 0; $i < $len; $i++ ) {
2164                         $c = $str{$i};
2165
2166                         switch( $state ) {
2167                         // (Using the number is a performance hack for common cases)
2168                         case 0: // self::COLON_STATE_TEXT:
2169                                 switch( $c ) {
2170                                 case "<":
2171                                         // Could be either a <start> tag or an </end> tag
2172                                         $state = self::COLON_STATE_TAGSTART;
2173                                         break;
2174                                 case ":":
2175                                         if( $stack == 0 ) {
2176                                                 // We found it!
2177                                                 $before = substr( $str, 0, $i );
2178                                                 $after = substr( $str, $i + 1 );
2179                                                 wfProfileOut( __METHOD__ );
2180                                                 return $i;
2181                                         }
2182                                         // Embedded in a tag; don't break it.
2183                                         break;
2184                                 default:
2185                                         // Skip ahead looking for something interesting
2186                                         $colon = strpos( $str, ':', $i );
2187                                         if( $colon === false ) {
2188                                                 // Nothing else interesting
2189                                                 wfProfileOut( __METHOD__ );
2190                                                 return false;
2191                                         }
2192                                         $lt = strpos( $str, '<', $i );
2193                                         if( $stack === 0 ) {
2194                                                 if( $lt === false || $colon < $lt ) {
2195                                                         // We found it!
2196                                                         $before = substr( $str, 0, $colon );
2197                                                         $after = substr( $str, $colon + 1 );
2198                                                         wfProfileOut( __METHOD__ );
2199                                                         return $i;
2200                                                 }
2201                                         }
2202                                         if( $lt === false ) {
2203                                                 // Nothing else interesting to find; abort!
2204                                                 // We're nested, but there's no close tags left. Abort!
2205                                                 break 2;
2206                                         }
2207                                         // Skip ahead to next tag start
2208                                         $i = $lt;
2209                                         $state = self::COLON_STATE_TAGSTART;
2210                                 }
2211                                 break;
2212                         case 1: // self::COLON_STATE_TAG:
2213                                 // In a <tag>
2214                                 switch( $c ) {
2215                                 case ">":
2216                                         $stack++;
2217                                         $state = self::COLON_STATE_TEXT;
2218                                         break;
2219                                 case "/":
2220                                         // Slash may be followed by >?
2221                                         $state = self::COLON_STATE_TAGSLASH;
2222                                         break;
2223                                 default:
2224                                         // ignore
2225                                 }
2226                                 break;
2227                         case 2: // self::COLON_STATE_TAGSTART:
2228                                 switch( $c ) {
2229                                 case "/":
2230                                         $state = self::COLON_STATE_CLOSETAG;
2231                                         break;
2232                                 case "!":
2233                                         $state = self::COLON_STATE_COMMENT;
2234                                         break;
2235                                 case ">":
2236                                         // Illegal early close? This shouldn't happen D:
2237                                         $state = self::COLON_STATE_TEXT;
2238                                         break;
2239                                 default:
2240                                         $state = self::COLON_STATE_TAG;
2241                                 }
2242                                 break;
2243                         case 3: // self::COLON_STATE_CLOSETAG:
2244                                 // In a </tag>
2245                                 if( $c === ">" ) {
2246                                         $stack--;
2247                                         if( $stack < 0 ) {
2248                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2249                                                 wfProfileOut( __METHOD__ );
2250                                                 return false;
2251                                         }
2252                                         $state = self::COLON_STATE_TEXT;
2253                                 }
2254                                 break;
2255                         case self::COLON_STATE_TAGSLASH:
2256                                 if( $c === ">" ) {
2257                                         // Yes, a self-closed tag <blah/>
2258                                         $state = self::COLON_STATE_TEXT;
2259                                 } else {
2260                                         // Probably we're jumping the gun, and this is an attribute
2261                                         $state = self::COLON_STATE_TAG;
2262                                 }
2263                                 break;
2264                         case 5: // self::COLON_STATE_COMMENT:
2265                                 if( $c === "-" ) {
2266                                         $state = self::COLON_STATE_COMMENTDASH;
2267                                 }
2268                                 break;
2269                         case self::COLON_STATE_COMMENTDASH:
2270                                 if( $c === "-" ) {
2271                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2272                                 } else {
2273                                         $state = self::COLON_STATE_COMMENT;
2274                                 }
2275                                 break;
2276                         case self::COLON_STATE_COMMENTDASHDASH:
2277                                 if( $c === ">" ) {
2278                                         $state = self::COLON_STATE_TEXT;
2279                                 } else {
2280                                         $state = self::COLON_STATE_COMMENT;
2281                                 }
2282                                 break;
2283                         default:
2284                                 throw new MWException( "State machine error in " . __METHOD__ );
2285                         }
2286                 }
2287                 if( $stack > 0 ) {
2288                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2289                         return false;
2290                 }
2291                 wfProfileOut( __METHOD__ );
2292                 return false;
2293         }
2294
2295         /**
2296          * Return value of a magic variable (like PAGENAME)
2297          *
2298          * @private
2299          */
2300         function getVariableValue( $index, $frame=false ) {
2301                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2302                 global $wgScriptPath, $wgStylePath;
2303
2304                 /**
2305                  * Some of these require message or data lookups and can be
2306                  * expensive to check many times.
2307                  */
2308                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2309                         if ( isset( $this->mVarCache[$index] ) ) {
2310                                 return $this->mVarCache[$index];
2311                         }
2312                 }
2313
2314                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2315                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2316
2317                 # Use the time zone
2318                 global $wgLocaltimezone;
2319                 if ( isset( $wgLocaltimezone ) ) {
2320                         $oldtz = getenv( 'TZ' );
2321                         putenv( 'TZ='.$wgLocaltimezone );
2322                 }
2323
2324                 wfSuppressWarnings(); // E_STRICT system time bitching
2325                 $localTimestamp = date( 'YmdHis', $ts );
2326                 $localMonth = date( 'm', $ts );
2327                 $localMonth1 = date( 'n', $ts );
2328                 $localMonthName = date( 'n', $ts );
2329                 $localDay = date( 'j', $ts );
2330                 $localDay2 = date( 'd', $ts );
2331                 $localDayOfWeek = date( 'w', $ts );
2332                 $localWeek = date( 'W', $ts );
2333                 $localYear = date( 'Y', $ts );
2334                 $localHour = date( 'H', $ts );
2335                 if ( isset( $wgLocaltimezone ) ) {
2336                         putenv( 'TZ='.$oldtz );
2337                 }
2338                 wfRestoreWarnings();
2339
2340                 switch ( $index ) {
2341                         case 'currentmonth':
2342                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2343                         case 'currentmonth1':
2344                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2345                         case 'currentmonthname':
2346                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2347                         case 'currentmonthnamegen':
2348                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2349                         case 'currentmonthabbrev':
2350                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2351                         case 'currentday':
2352                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2353                         case 'currentday2':
2354                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2355                         case 'localmonth':
2356                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth );
2357                         case 'localmonth1':
2358                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth1 );
2359                         case 'localmonthname':
2360                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( $localMonthName );
2361                         case 'localmonthnamegen':
2362                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2363                         case 'localmonthabbrev':
2364                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2365                         case 'localday':
2366                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay );
2367                         case 'localday2':
2368                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay2 );
2369                         case 'pagename':
2370                                 return wfEscapeWikiText( $this->mTitle->getText() );
2371                         case 'pagenamee':
2372                                 return $this->mTitle->getPartialURL();
2373                         case 'fullpagename':
2374                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2375                         case 'fullpagenamee':
2376                                 return $this->mTitle->getPrefixedURL();
2377                         case 'subpagename':
2378                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2379                         case 'subpagenamee':
2380                                 return $this->mTitle->getSubpageUrlForm();
2381                         case 'basepagename':
2382                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2383                         case 'basepagenamee':
2384                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2385                         case 'talkpagename':
2386                                 if( $this->mTitle->canTalk() ) {
2387                                         $talkPage = $this->mTitle->getTalkPage();
2388                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2389                                 } else {
2390                                         return '';
2391                                 }
2392                         case 'talkpagenamee':
2393                                 if( $this->mTitle->canTalk() ) {
2394                                         $talkPage = $this->mTitle->getTalkPage();
2395                                         return $talkPage->getPrefixedUrl();
2396                                 } else {
2397                                         return '';
2398                                 }
2399                         case 'subjectpagename':
2400                                 $subjPage = $this->mTitle->getSubjectPage();
2401                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2402                         case 'subjectpagenamee':
2403                                 $subjPage = $this->mTitle->getSubjectPage();
2404                                 return $subjPage->getPrefixedUrl();
2405                         case 'revisionid':
2406                                 // Let the edit saving system know we should parse the page
2407                                 // *after* a revision ID has been assigned.
2408                                 $this->mOutput->setFlag( 'vary-revision' );
2409                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2410                                 return $this->mRevisionId;
2411                         case 'revisionday':
2412                                 // Let the edit saving system know we should parse the page
2413                                 // *after* a revision ID has been assigned. This is for null edits.
2414                                 $this->mOutput->setFlag( 'vary-revision' );
2415                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2416                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2417                         case 'revisionday2':
2418                                 // Let the edit saving system know we should parse the page
2419                                 // *after* a revision ID has been assigned. This is for null edits.
2420                                 $this->mOutput->setFlag( 'vary-revision' );
2421                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2422                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2423                         case 'revisionmonth':
2424                                 // Let the edit saving system know we should parse the page
2425                                 // *after* a revision ID has been assigned. This is for null edits.
2426                                 $this->mOutput->setFlag( 'vary-revision' );
2427                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2428                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2429                         case 'revisionyear':
2430                                 // Let the edit saving system know we should parse the page
2431                                 // *after* a revision ID has been assigned. This is for null edits.
2432                                 $this->mOutput->setFlag( 'vary-revision' );
2433                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2434                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2435                         case 'revisiontimestamp':
2436                                 // Let the edit saving system know we should parse the page
2437                                 // *after* a revision ID has been assigned. This is for null edits.
2438                                 $this->mOutput->setFlag( 'vary-revision' );
2439                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2440                                 return $this->getRevisionTimestamp();
2441                         case 'revisionuser':
2442                                 // Let the edit saving system know we should parse the page
2443                                 // *after* a revision ID has been assigned. This is for null edits.
2444                                 $this->mOutput->setFlag( 'vary-revision' );
2445                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2446                                 return $this->getRevisionUser();
2447                         case 'namespace':
2448                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2449                         case 'namespacee':
2450                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2451                         case 'talkspace':
2452                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2453                         case 'talkspacee':
2454                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2455                         case 'subjectspace':
2456                                 return $this->mTitle->getSubjectNsText();
2457                         case 'subjectspacee':
2458                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2459                         case 'currentdayname':
2460                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2461                         case 'currentyear':
2462                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2463                         case 'currenttime':
2464                                 return $this->mVarCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2465                         case 'currenthour':
2466                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2467                         case 'currentweek':
2468                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2469                                 // int to remove the padding
2470                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2471                         case 'currentdow':
2472                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2473                         case 'localdayname':
2474                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2475                         case 'localyear':
2476                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localYear, true );
2477                         case 'localtime':
2478                                 return $this->mVarCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2479                         case 'localhour':
2480                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localHour, true );
2481                         case 'localweek':
2482                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2483                                 // int to remove the padding
2484                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2485                         case 'localdow':
2486                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2487                         case 'numberofarticles':
2488                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2489                         case 'numberoffiles':
2490                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2491                         case 'numberofusers':
2492                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2493                         case 'numberofactiveusers':
2494                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::activeUsers() );
2495                         case 'numberofpages':
2496                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2497                         case 'numberofadmins':
2498                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2499                         case 'numberofedits':
2500                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2501                         case 'numberofviews':
2502                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::views() );
2503                         case 'currenttimestamp':
2504                                 return $this->mVarCache[$index] = wfTimestamp( TS_MW, $ts );
2505                         case 'localtimestamp':
2506                                 return $this->mVarCache[$index] = $localTimestamp;
2507                         case 'currentversion':
2508                                 return $this->mVarCache[$index] = SpecialVersion::getVersion();
2509                         case 'sitename':
2510                                 return $wgSitename;
2511                         case 'server':
2512                                 return $wgServer;
2513                         case 'servername':
2514                                 return $wgServerName;
2515                         case 'scriptpath':
2516                                 return $wgScriptPath;
2517                         case 'stylepath':
2518                                 return $wgStylePath;
2519                         case 'directionmark':
2520                                 return $wgContLang->getDirMark();
2521                         case 'contentlanguage':
2522                                 global $wgContLanguageCode;
2523                                 return $wgContLanguageCode;
2524                         default:
2525                                 $ret = null;
2526                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) )
2527                                         return $ret;
2528                                 else
2529                                         return null;
2530                 }
2531         }
2532
2533         /**
2534          * initialise the magic variables (like CURRENTMONTHNAME)
2535          *
2536          * @private
2537          */
2538         function initialiseVariables() {
2539                 wfProfileIn( __METHOD__ );
2540                 $variableIDs = MagicWord::getVariableIDs();
2541
2542                 $this->mVariables = new MagicWordArray( $variableIDs );
2543                 wfProfileOut( __METHOD__ );
2544         }
2545
2546         /**
2547          * Preprocess some wikitext and return the document tree.
2548          * This is the ghost of replace_variables().
2549          *
2550          * @param string $text The text to parse
2551          * @param integer flags Bitwise combination of:
2552          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2553          *                                     included. Default is to assume a direct page view.
2554          *
2555          * The generated DOM tree must depend only on the input text and the flags.
2556          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2557          *
2558          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2559          * change in the DOM tree for a given text, must be passed through the section identifier
2560          * in the section edit link and thus back to extractSections().
2561          *
2562          * The output of this function is currently only cached in process memory, but a persistent
2563          * cache may be implemented at a later date which takes further advantage of these strict
2564          * dependency requirements.
2565          *
2566          * @private
2567          */
2568         function preprocessToDom ( $text, $flags = 0 ) {
2569                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2570                 return $dom;
2571         }
2572
2573         /*
2574          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2575          */
2576         public static function splitWhitespace( $s ) {
2577                 $ltrimmed = ltrim( $s );
2578                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2579                 $trimmed = rtrim( $ltrimmed );
2580                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2581                 if ( $diff > 0 ) {
2582                         $w2 = substr( $ltrimmed, -$diff );
2583                 } else {
2584                         $w2 = '';
2585                 }
2586                 return array( $w1, $trimmed, $w2 );
2587         }
2588
2589         /**
2590          * Replace magic variables, templates, and template arguments
2591          * with the appropriate text. Templates are substituted recursively,
2592          * taking care to avoid infinite loops.
2593          *
2594          * Note that the substitution depends on value of $mOutputType:
2595          *  self::OT_WIKI: only {{subst:}} templates
2596          *  self::OT_PREPROCESS: templates but not extension tags
2597          *  self::OT_HTML: all templates and extension tags
2598          *
2599          * @param string $tex The text to transform
2600          * @param PPFrame $frame Object describing the arguments passed to the template.
2601          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2602          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2603          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2604          * @private
2605          */
2606         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2607                 # Is there any text? Also, Prevent too big inclusions!
2608                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2609                         return $text;
2610                 }
2611                 wfProfileIn( __METHOD__ );
2612
2613                 if ( $frame === false ) {
2614                         $frame = $this->getPreprocessor()->newFrame();
2615                 } elseif ( !( $frame instanceof PPFrame ) ) {
2616                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2617                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2618                 }
2619
2620                 $dom = $this->preprocessToDom( $text );
2621                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2622                 $text = $frame->expand( $dom, $flags );
2623
2624                 wfProfileOut( __METHOD__ );
2625                 return $text;
2626         }
2627
2628         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2629         static function createAssocArgs( $args ) {
2630                 $assocArgs = array();
2631                 $index = 1;
2632                 foreach( $args as $arg ) {
2633                         $eqpos = strpos( $arg, '=' );
2634                         if ( $eqpos === false ) {
2635                                 $assocArgs[$index++] = $arg;
2636                         } else {
2637                                 $name = trim( substr( $arg, 0, $eqpos ) );
2638                                 $value = trim( substr( $arg, $eqpos+1 ) );
2639                                 if ( $value === false ) {
2640                                         $value = '';
2641                                 }
2642                                 if ( $name !== false ) {
2643                                         $assocArgs[$name] = $value;
2644                                 }
2645                         }
2646                 }
2647
2648                 return $assocArgs;
2649         }
2650
2651         /**
2652          * Warn the user when a parser limitation is reached
2653          * Will warn at most once the user per limitation type
2654          *
2655          * @param string $limitationType, should be one of:
2656          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2657          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2658          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2659          * @params int $current, $max When an explicit limit has been
2660          *       exceeded, provide the values (optional)
2661          */
2662         function limitationWarn( $limitationType, $current=null, $max=null) {
2663                 $msgName = $limitationType . '-warning';
2664                 //does no harm if $current and $max are present but are unnecessary for the message
2665                 $warning = wfMsgExt( $msgName, array( 'parsemag', 'escape' ), $current, $max );
2666                 $this->mOutput->addWarning( $warning );
2667                 $cat = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( $limitationType . '-category' ) );
2668                 if ( $cat ) {
2669                         $this->mOutput->addCategory( $cat->getDBkey(), $this->getDefaultSort() );
2670                 }
2671         }
2672
2673         /**
2674          * Return the text of a template, after recursively
2675          * replacing any variables or templates within the template.
2676          *
2677          * @param array $piece The parts of the template
2678          *  $piece['title']: the title, i.e. the part before the |
2679          *  $piece['parts']: the parameter array
2680          *  $piece['lineStart']: whether the brace was at the start of a line
2681          * @param PPFrame The current frame, contains template arguments
2682          * @return string the text of the template
2683          * @private
2684          */
2685         function braceSubstitution( $piece, $frame ) {
2686                 global $wgContLang, $wgNonincludableNamespaces;
2687                 wfProfileIn( __METHOD__ );
2688                 wfProfileIn( __METHOD__.'-setup' );
2689
2690                 # Flags
2691                 $found = false;             # $text has been filled
2692                 $nowiki = false;            # wiki markup in $text should be escaped
2693                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2694                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2695                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2696                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2697
2698                 # Title object, where $text came from
2699                 $title = NULL;
2700
2701                 # $part1 is the bit before the first |, and must contain only title characters.
2702                 # Various prefixes will be stripped from it later.
2703                 $titleWithSpaces = $frame->expand( $piece['title'] );
2704                 $part1 = trim( $titleWithSpaces );
2705                 $titleText = false;
2706
2707                 # Original title text preserved for various purposes
2708                 $originalTitle = $part1;
2709
2710                 # $args is a list of argument nodes, starting from index 0, not including $part1
2711                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2712                 wfProfileOut( __METHOD__.'-setup' );
2713
2714                 # SUBST
2715                 wfProfileIn( __METHOD__.'-modifiers' );
2716                 if ( !$found ) {
2717                         $mwSubst = MagicWord::get( 'subst' );
2718                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2719                                 # One of two possibilities is true:
2720                                 # 1) Found SUBST but not in the PST phase
2721                                 # 2) Didn't find SUBST and in the PST phase
2722                                 # In either case, return without further processing
2723                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2724                                 $isLocalObj = true;
2725                                 $found = true;
2726                         }
2727                 }
2728
2729                 # Variables
2730                 if ( !$found && $args->getLength() == 0 ) {
2731                         $id = $this->mVariables->matchStartToEnd( $part1 );
2732                         if ( $id !== false ) {
2733                                 $text = $this->getVariableValue( $id, $frame );
2734                                 if (MagicWord::getCacheTTL($id)>-1)
2735                                         $this->mOutput->mContainsOldMagic = true;
2736                                 $found = true;
2737                         }
2738                 }
2739
2740                 # MSG, MSGNW and RAW
2741                 if ( !$found ) {
2742                         # Check for MSGNW:
2743                         $mwMsgnw = MagicWord::get( 'msgnw' );
2744                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2745                                 $nowiki = true;
2746                         } else {
2747                                 # Remove obsolete MSG:
2748                                 $mwMsg = MagicWord::get( 'msg' );
2749                                 $mwMsg->matchStartAndRemove( $part1 );
2750                         }
2751
2752                         # Check for RAW:
2753                         $mwRaw = MagicWord::get( 'raw' );
2754                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2755                                 $forceRawInterwiki = true;
2756                         }
2757                 }
2758                 wfProfileOut( __METHOD__.'-modifiers' );
2759
2760                 # Parser functions
2761                 if ( !$found ) {
2762                         wfProfileIn( __METHOD__ . '-pfunc' );
2763
2764                         $colonPos = strpos( $part1, ':' );
2765                         if ( $colonPos !== false ) {
2766                                 # Case sensitive functions
2767                                 $function = substr( $part1, 0, $colonPos );
2768                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2769                                         $function = $this->mFunctionSynonyms[1][$function];
2770                                 } else {
2771                                         # Case insensitive functions
2772                                         $function = $wgContLang->lc( $function );
2773                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2774                                                 $function = $this->mFunctionSynonyms[0][$function];
2775                                         } else {
2776                                                 $function = false;
2777                                         }
2778                                 }
2779                                 if ( $function ) {
2780                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2781                                         $initialArgs = array( &$this );
2782                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2783                                         if ( $flags & SFH_OBJECT_ARGS ) {
2784                                                 # Add a frame parameter, and pass the arguments as an array
2785                                                 $allArgs = $initialArgs;
2786                                                 $allArgs[] = $frame;
2787                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2788                                                         $funcArgs[] = $args->item( $i );
2789                                                 }
2790                                                 $allArgs[] = $funcArgs;
2791                                         } else {
2792                                                 # Convert arguments to plain text
2793                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2794                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2795                                                 }
2796                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2797                                         }
2798
2799                                         # Workaround for PHP bug 35229 and similar
2800                                         if ( !is_callable( $callback ) ) {
2801                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2802                                                 wfProfileOut( __METHOD__ );
2803                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2804                                         }
2805                                         $result = call_user_func_array( $callback, $allArgs );
2806                                         $found = true;
2807                                         $noparse = true;
2808                                         $preprocessFlags = 0;
2809
2810                                         if ( is_array( $result ) ) {
2811                                                 if ( isset( $result[0] ) ) {
2812                                                         $text = $result[0];
2813                                                         unset( $result[0] );
2814                                                 }
2815
2816                                                 // Extract flags into the local scope
2817                                                 // This allows callers to set flags such as nowiki, found, etc.
2818                                                 extract( $result );
2819                                         } else {
2820                                                 $text = $result;
2821                                         }
2822                                         if ( !$noparse ) {
2823                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2824                                                 $isChildObj = true;
2825                                         }
2826                                 }
2827                         }
2828                         wfProfileOut( __METHOD__ . '-pfunc' );
2829                 }
2830
2831                 # Finish mangling title and then check for loops.
2832                 # Set $title to a Title object and $titleText to the PDBK
2833                 if ( !$found ) {
2834                         $ns = NS_TEMPLATE;
2835                         # Split the title into page and subpage
2836                         $subpage = '';
2837                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2838                         if ($subpage !== '') {
2839                                 $ns = $this->mTitle->getNamespace();
2840                         }
2841                         $title = Title::newFromText( $part1, $ns );
2842                         if ( $title ) {
2843                                 $titleText = $title->getPrefixedText();
2844                                 # Check for language variants if the template is not found
2845                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2846                                         $wgContLang->findVariantLink( $part1, $title, true );
2847                                 }
2848                                 # Do recursion depth check
2849                                 $limit = $this->mOptions->getMaxTemplateDepth();
2850                                 if ( $frame->depth >= $limit ) {
2851                                         $found = true;
2852                                         $text = '<span class="error">' . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit ) . '</span>';
2853                                 }
2854                         }
2855                 }
2856
2857                 # Load from database
2858                 if ( !$found && $title ) {
2859                         wfProfileIn( __METHOD__ . '-loadtpl' );
2860                         if ( !$title->isExternal() ) {
2861                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2862                                         $text = SpecialPage::capturePath( $title );
2863                                         if ( is_string( $text ) ) {
2864                                                 $found = true;
2865                                                 $isHTML = true;
2866                                                 $this->disableCache();
2867                                         }
2868                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2869                                         $found = false; //access denied
2870                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2871                                 } else {
2872                                         list( $text, $title ) = $this->getTemplateDom( $title );
2873                                         if ( $text !== false ) {
2874                                                 $found = true;
2875                                                 $isChildObj = true;
2876                                         }
2877                                 }
2878
2879                                 # If the title is valid but undisplayable, make a link to it
2880                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2881                                         $text = "[[:$titleText]]";
2882                                         $found = true;
2883                                 }
2884                         } elseif ( $title->isTrans() ) {
2885                                 // Interwiki transclusion
2886                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2887                                         $text = $this->interwikiTransclude( $title, 'render' );
2888                                         $isHTML = true;
2889                                 } else {
2890                                         $text = $this->interwikiTransclude( $title, 'raw' );
2891                                         // Preprocess it like a template
2892                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2893                                         $isChildObj = true;
2894                                 }
2895                                 $found = true;
2896                         }
2897
2898                         # Do infinite loop check
2899                         # This has to be done after redirect resolution to avoid infinite loops via redirects
2900                         if ( !$frame->loopCheck( $title ) ) {
2901                                 $found = true;
2902                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
2903                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2904                         }
2905                         wfProfileOut( __METHOD__ . '-loadtpl' );
2906                 }
2907
2908                 # If we haven't found text to substitute by now, we're done
2909                 # Recover the source wikitext and return it
2910                 if ( !$found ) {
2911                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2912                         wfProfileOut( __METHOD__ );
2913                         return array( 'object' => $text );
2914                 }
2915
2916                 # Expand DOM-style return values in a child frame
2917                 if ( $isChildObj ) {
2918                         # Clean up argument array
2919                         $newFrame = $frame->newChild( $args, $title );
2920
2921                         if ( $nowiki ) {
2922                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
2923                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
2924                                 # Expansion is eligible for the empty-frame cache
2925                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
2926                                         $text = $this->mTplExpandCache[$titleText];
2927                                 } else {
2928                                         $text = $newFrame->expand( $text );
2929                                         $this->mTplExpandCache[$titleText] = $text;
2930                                 }
2931                         } else {
2932                                 # Uncached expansion
2933                                 $text = $newFrame->expand( $text );
2934                         }
2935                 }
2936                 if ( $isLocalObj && $nowiki ) {
2937                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
2938                         $isLocalObj = false;
2939                 }
2940
2941                 # Replace raw HTML by a placeholder
2942                 # Add a blank line preceding, to prevent it from mucking up
2943                 # immediately preceding headings
2944                 if ( $isHTML ) {
2945                         $text = "\n\n" . $this->insertStripItem( $text );
2946                 }
2947                 # Escape nowiki-style return values
2948                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2949                         $text = wfEscapeWikiText( $text );
2950                 }
2951                 # Bug 529: if the template begins with a table or block-level
2952                 # element, it should be treated as beginning a new line.
2953                 # This behaviour is somewhat controversial.
2954                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
2955                         $text = "\n" . $text;
2956                 }
2957
2958                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
2959                         # Error, oversize inclusion
2960                         $text = "[[$originalTitle]]" .
2961                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
2962                         $this->limitationWarn( 'post-expand-template-inclusion' );
2963                 }
2964
2965                 if ( $isLocalObj ) {
2966                         $ret = array( 'object' => $text );
2967                 } else {
2968                         $ret = array( 'text' => $text );
2969                 }
2970
2971                 wfProfileOut( __METHOD__ );
2972                 return $ret;
2973         }
2974
2975         /**
2976          * Get the semi-parsed DOM representation of a template with a given title,
2977          * and its redirect destination title. Cached.
2978          */
2979         function getTemplateDom( $title ) {
2980                 $cacheTitle = $title;
2981                 $titleText = $title->getPrefixedDBkey();
2982
2983                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
2984                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
2985                         $title = Title::makeTitle( $ns, $dbk );
2986                         $titleText = $title->getPrefixedDBkey();
2987                 }
2988                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
2989                         return array( $this->mTplDomCache[$titleText], $title );
2990                 }
2991
2992                 // Cache miss, go to the database
2993                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
2994
2995                 if ( $text === false ) {
2996                         $this->mTplDomCache[$titleText] = false;
2997                         return array( false, $title );
2998                 }
2999
3000                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3001                 $this->mTplDomCache[ $titleText ] = $dom;
3002
3003                 if (! $title->equals($cacheTitle)) {
3004                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3005                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3006                 }
3007
3008                 return array( $dom, $title );
3009         }
3010
3011         /**
3012          * Fetch the unparsed text of a template and register a reference to it.
3013          */
3014         function fetchTemplateAndTitle( $title ) {
3015                 $templateCb = $this->mOptions->getTemplateCallback();
3016                 $stuff = call_user_func( $templateCb, $title, $this );
3017                 $text = $stuff['text'];
3018                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3019                 if ( isset( $stuff['deps'] ) ) {
3020                         foreach ( $stuff['deps'] as $dep ) {
3021                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3022                         }
3023                 }
3024                 return array($text,$finalTitle);
3025         }
3026
3027         function fetchTemplate( $title ) {
3028                 $rv = $this->fetchTemplateAndTitle($title);
3029                 return $rv[0];
3030         }
3031
3032         /**
3033          * Static function to get a template
3034          * Can be overridden via ParserOptions::setTemplateCallback().
3035          */
3036         static function statelessFetchTemplate( $title, $parser=false ) {
3037                 $text = $skip = false;
3038                 $finalTitle = $title;
3039                 $deps = array();
3040
3041                 // Loop to fetch the article, with up to 1 redirect
3042                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3043                         # Give extensions a chance to select the revision instead
3044                         $id = false; // Assume current
3045                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3046
3047                         if( $skip ) {
3048                                 $text = false;
3049                                 $deps[] = array(
3050                                         'title' => $title,
3051                                         'page_id' => $title->getArticleID(),
3052                                         'rev_id' => null );
3053                                 break;
3054                         }
3055                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3056                         $rev_id = $rev ? $rev->getId() : 0;
3057                         // If there is no current revision, there is no page
3058                         if( $id === false && !$rev ) {
3059                                 $linkCache = LinkCache::singleton();
3060                                 $linkCache->addBadLinkObj( $title );
3061                         }
3062
3063                         $deps[] = array(
3064                                 'title' => $title,
3065                                 'page_id' => $title->getArticleID(),
3066                                 'rev_id' => $rev_id );
3067
3068                         if( $rev ) {
3069                                 $text = $rev->getText();
3070                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3071                                 global $wgContLang;
3072                                 $message = $wgContLang->lcfirst( $title->getText() );
3073                                 $text = wfMsgForContentNoTrans( $message );
3074                                 if( wfEmptyMsg( $message, $text ) ) {
3075                                         $text = false;
3076                                         break;
3077                                 }
3078                         } else {
3079                                 break;
3080                         }
3081                         if ( $text === false ) {
3082                                 break;
3083                         }
3084                         // Redirect?
3085                         $finalTitle = $title;
3086                         $title = Title::newFromRedirect( $text );
3087                 }
3088                 return array(
3089                         'text' => $text,
3090                         'finalTitle' => $finalTitle,
3091                         'deps' => $deps );
3092         }
3093
3094         /**
3095          * Transclude an interwiki link.
3096          */
3097         function interwikiTransclude( $title, $action ) {
3098                 global $wgEnableScaryTranscluding;
3099
3100                 if (!$wgEnableScaryTranscluding)
3101                         return wfMsg('scarytranscludedisabled');
3102
3103                 $url = $title->getFullUrl( "action=$action" );
3104
3105                 if (strlen($url) > 255)
3106                         return wfMsg('scarytranscludetoolong');
3107                 return $this->fetchScaryTemplateMaybeFromCache($url);
3108         }
3109
3110         function fetchScaryTemplateMaybeFromCache($url) {
3111                 global $wgTranscludeCacheExpiry;
3112                 $dbr = wfGetDB(DB_SLAVE);
3113                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3114                                 array('tc_url' => $url));
3115                 if ($obj) {
3116                         $time = $obj->tc_time;
3117                         $text = $obj->tc_contents;
3118                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3119                                 return $text;
3120                         }
3121                 }
3122
3123                 $text = Http::get($url);
3124                 if (!$text)
3125                         return wfMsg('scarytranscludefailed', $url);
3126
3127                 $dbw = wfGetDB(DB_MASTER);
3128                 $dbw->replace('transcache', array('tc_url'), array(
3129                         'tc_url' => $url,
3130                         'tc_time' => time(),
3131                         'tc_contents' => $text));
3132                 return $text;
3133         }
3134
3135
3136         /**
3137          * Triple brace replacement -- used for template arguments
3138          * @private
3139          */
3140         function argSubstitution( $piece, $frame ) {
3141                 wfProfileIn( __METHOD__ );
3142
3143                 $error = false;
3144                 $parts = $piece['parts'];
3145                 $nameWithSpaces = $frame->expand( $piece['title'] );
3146                 $argName = trim( $nameWithSpaces );
3147                 $object = false;
3148                 $text = $frame->getArgument( $argName );
3149                 if (  $text === false && $parts->getLength() > 0
3150                   && (
3151                     $this->ot['html']
3152                     || $this->ot['pre']
3153                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3154                   )
3155                 ) {
3156                         # No match in frame, use the supplied default
3157                         $object = $parts->item( 0 )->getChildren();
3158                 }
3159                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3160                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3161                         $this->limitationWarn( 'post-expand-template-argument' );
3162                 }
3163
3164                 if ( $text === false && $object === false ) {
3165                         # No match anywhere
3166                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3167                 }
3168                 if ( $error !== false ) {
3169                         $text .= $error;
3170                 }
3171                 if ( $object !== false ) {
3172                         $ret = array( 'object' => $object );
3173                 } else {
3174                         $ret = array( 'text' => $text );
3175                 }
3176
3177                 wfProfileOut( __METHOD__ );
3178                 return $ret;
3179         }
3180
3181         /**
3182          * Return the text to be used for a given extension tag.
3183          * This is the ghost of strip().
3184          *
3185          * @param array $params Associative array of parameters:
3186          *     name       PPNode for the tag name
3187          *     attr       PPNode for unparsed text where tag attributes are thought to be
3188          *     attributes Optional associative array of parsed attributes
3189          *     inner      Contents of extension element
3190          *     noClose    Original text did not have a close tag
3191          * @param PPFrame $frame
3192          */
3193         function extensionSubstitution( $params, $frame ) {
3194                 global $wgRawHtml, $wgContLang;
3195
3196                 $name = $frame->expand( $params['name'] );
3197                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3198                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3199
3200                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3201
3202                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3203                         ( $this->ot['html'] || $this->ot['pre'] );
3204                 if ( $this->ot['html'] || $isFunctionTag ) {
3205                         $name = strtolower( $name );
3206                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3207                         if ( isset( $params['attributes'] ) ) {
3208                                 $attributes = $attributes + $params['attributes'];
3209                         }
3210                         switch ( $name ) {
3211                                 case 'html':
3212                                         if( $wgRawHtml ) {
3213                                                 $output = $content;
3214                                                 break;
3215                                         } else {
3216                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3217                                         }
3218                                 case 'nowiki':
3219                                         $content = strtr($content, array('-{' => '-&#123;', '}-' => '&#125;-'));
3220                                         $output = Xml::escapeTagsOnly( $content );
3221                                         break;
3222                                 case 'math':
3223                                         $output = $wgContLang->armourMath(
3224                                                 MathRenderer::renderMath( $content, $attributes ) );
3225                                         break;
3226                                 case 'gallery':
3227                                         $output = $this->renderImageGallery( $content, $attributes );
3228                                         break;
3229                                 default:
3230                                         if( isset( $this->mTagHooks[$name] ) ) {
3231                                                 # Workaround for PHP bug 35229 and similar
3232                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3233                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3234                                                 }
3235                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3236                                                         array( $content, $attributes, $this, $frame ) );
3237                                         } elseif( isset( $this->mFunctionTagHooks[$name] ) ) {
3238                                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3239                                                 if( !is_callable( $callback ) )
3240                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3241
3242                                                 $output = call_user_func_array( $callback,
3243                                                         array( &$this, $frame, $content, $attributes ) );
3244                                         } else {
3245                                                 $output = '<span class="error">Invalid tag extension name: ' .
3246                                                         htmlspecialchars( $name ) . '</span>';
3247                                         }
3248                         }
3249                 } else {
3250                         if ( is_null( $attrText ) ) {
3251                                 $attrText = '';
3252                         }
3253                         if ( isset( $params['attributes'] ) ) {
3254                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3255                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3256                                                 htmlspecialchars( $attrValue ) . '"';
3257                                 }
3258                         }
3259                         if ( $content === null ) {
3260                                 $output = "<$name$attrText/>";
3261                         } else {
3262                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3263                                 $output = "<$name$attrText>$content$close";
3264                         }
3265                 }
3266
3267                 if( $isFunctionTag ) {
3268                         return $output;
3269                 } elseif ( $name === 'html' || $name === 'nowiki' ) {
3270                         $this->mStripState->nowiki->setPair( $marker, $output );
3271                 } else {
3272                         $this->mStripState->general->setPair( $marker, $output );
3273                 }
3274                 return $marker;
3275         }
3276
3277         /**
3278          * Increment an include size counter
3279          *
3280          * @param string $type The type of expansion
3281          * @param integer $size The size of the text
3282          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3283          */
3284         function incrementIncludeSize( $type, $size ) {
3285                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3286                         return false;
3287                 } else {
3288                         $this->mIncludeSizes[$type] += $size;
3289                         return true;
3290                 }
3291         }
3292
3293         /**
3294          * Increment the expensive function count
3295          *
3296          * @return boolean False if the limit has been exceeded
3297          */
3298         function incrementExpensiveFunctionCount() {
3299                 global $wgExpensiveParserFunctionLimit;
3300                 $this->mExpensiveFunctionCount++;
3301                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3302                         return true;
3303                 }
3304                 return false;
3305         }
3306
3307         /**
3308          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3309          * Fills $this->mDoubleUnderscores, returns the modified text
3310          */
3311         function doDoubleUnderscore( $text ) {
3312                 wfProfileIn( __METHOD__ );
3313                 // The position of __TOC__ needs to be recorded
3314                 $mw = MagicWord::get( 'toc' );
3315                 if( $mw->match( $text ) ) {
3316                         $this->mShowToc = true;
3317                         $this->mForceTocPosition = true;
3318
3319                         // Set a placeholder. At the end we'll fill it in with the TOC.
3320                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3321
3322                         // Only keep the first one.
3323                         $text = $mw->replace( '', $text );
3324                 }
3325
3326                 // Now match and remove the rest of them
3327                 $mwa = MagicWord::getDoubleUnderscoreArray();
3328                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3329
3330                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3331                         $this->mOutput->mNoGallery = true;
3332                 }
3333                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3334                         $this->mShowToc = false;
3335                 }
3336                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3337                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3338
3339                         $containerCategory = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( 'hidden-category-category' ) );
3340                         if ( $containerCategory ) {
3341                                 $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3342                         } else {
3343                                 wfDebug( __METHOD__.": [[MediaWiki:hidden-category-category]] is not a valid title!\n" );
3344                         }
3345                 }
3346                 # (bug 8068) Allow control over whether robots index a page.
3347                 #
3348                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3349                 # is not desirable, the last one on the page should win.
3350                 if( isset( $this->mDoubleUnderscores['noindex'] ) ) {
3351                         $this->mOutput->setIndexPolicy( 'noindex' );
3352                 } elseif( isset( $this->mDoubleUnderscores['index'] ) ) {
3353                         $this->mOutput->setIndexPolicy( 'index' );
3354                 }
3355                 wfProfileOut( __METHOD__ );
3356                 return $text;
3357         }
3358
3359         /**
3360          * This function accomplishes several tasks:
3361          * 1) Auto-number headings if that option is enabled
3362          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3363          * 3) Add a Table of contents on the top for users who have enabled the option
3364          * 4) Auto-anchor headings
3365          *
3366          * It loops through all headlines, collects the necessary data, then splits up the
3367          * string and re-inserts the newly formatted headlines.
3368          *
3369          * @param string $text
3370          * @param string $origText Original, untouched wikitext
3371          * @param boolean $isMain
3372          * @private
3373          */
3374         function formatHeadings( $text, $origText, $isMain=true ) {
3375                 global $wgMaxTocLevel, $wgContLang, $wgEnforceHtmlIds;
3376
3377                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3378                 $showEditLink = $this->mOptions->getEditSection();
3379
3380                 // Do not call quickUserCan unless necessary
3381                 if( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3382                         $showEditLink = 0;
3383                 }
3384
3385                 # Inhibit editsection links if requested in the page
3386                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3387                         $showEditLink = 0;
3388                 }
3389
3390                 # Get all headlines for numbering them and adding funky stuff like [edit]
3391                 # links - this is for later, but we need the number of headlines right now
3392                 $matches = array();
3393                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3394
3395                 # if there are fewer than 4 headlines in the article, do not show TOC
3396                 # unless it's been explicitly enabled.
3397                 $enoughToc = $this->mShowToc &&
3398                         (($numMatches >= 4) || $this->mForceTocPosition);
3399
3400                 # Allow user to stipulate that a page should have a "new section"
3401                 # link added via __NEWSECTIONLINK__
3402                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3403                         $this->mOutput->setNewSection( true );
3404                 }
3405
3406                 # Allow user to remove the "new section"
3407                 # link via __NONEWSECTIONLINK__
3408                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3409                         $this->mOutput->hideNewSection( true );
3410                 }
3411
3412                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3413                 # override above conditions and always show TOC above first header
3414                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3415                         $this->mShowToc = true;
3416                         $enoughToc = true;
3417                 }
3418
3419                 # We need this to perform operations on the HTML
3420                 $sk = $this->mOptions->getSkin();
3421
3422                 # headline counter
3423                 $headlineCount = 0;
3424                 $numVisible = 0;
3425
3426                 # Ugh .. the TOC should have neat indentation levels which can be
3427                 # passed to the skin functions. These are determined here
3428                 $toc = '';
3429                 $full = '';
3430                 $head = array();
3431                 $sublevelCount = array();
3432                 $levelCount = array();
3433                 $toclevel = 0;
3434                 $level = 0;
3435                 $prevlevel = 0;
3436                 $toclevel = 0;
3437                 $prevtoclevel = 0;
3438                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3439                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3440                 $oldType = $this->mOutputType;
3441                 $this->setOutputType( self::OT_WIKI );
3442                 $frame = $this->getPreprocessor()->newFrame();
3443                 $root = $this->preprocessToDom( $origText );
3444                 $node = $root->getFirstChild();
3445                 $byteOffset = 0;
3446                 $tocraw = array();
3447
3448                 foreach( $matches[3] as $headline ) {
3449                         $isTemplate = false;
3450                         $titleText = false;
3451                         $sectionIndex = false;
3452                         $numbering = '';
3453                         $markerMatches = array();
3454                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3455                                 $serial = $markerMatches[1];
3456                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3457                                 $isTemplate = ($titleText != $baseTitleText);
3458                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3459                         }
3460
3461                         if( $toclevel ) {
3462                                 $prevlevel = $level;
3463                                 $prevtoclevel = $toclevel;
3464                         }
3465                         $level = $matches[1][$headlineCount];
3466
3467                         if ( $level > $prevlevel ) {
3468                                 # Increase TOC level
3469                                 $toclevel++;
3470                                 $sublevelCount[$toclevel] = 0;
3471                                 if( $toclevel<$wgMaxTocLevel ) {
3472                                         $prevtoclevel = $toclevel;
3473                                         $toc .= $sk->tocIndent();
3474                                         $numVisible++;
3475                                 }
3476                         }
3477                         elseif ( $level < $prevlevel && $toclevel > 1 ) {
3478                                 # Decrease TOC level, find level to jump to
3479
3480                                 for ($i = $toclevel; $i > 0; $i--) {
3481                                         if ( $levelCount[$i] == $level ) {
3482                                                 # Found last matching level
3483                                                 $toclevel = $i;
3484                                                 break;
3485                                         }
3486                                         elseif ( $levelCount[$i] < $level ) {
3487                                                 # Found first matching level below current level
3488                                                 $toclevel = $i + 1;
3489                                                 break;
3490                                         }
3491                                 }
3492                                 if( $i == 0 ) $toclevel = 1;
3493                                 if( $toclevel<$wgMaxTocLevel ) {
3494                                         if($prevtoclevel < $wgMaxTocLevel) {
3495                                                 # Unindent only if the previous toc level was shown :p
3496                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3497                                                 $prevtoclevel = $toclevel;
3498                                         } else {
3499                                                 $toc .= $sk->tocLineEnd();
3500                                         }
3501                                 }
3502                         }
3503                         else {
3504                                 # No change in level, end TOC line
3505                                 if( $toclevel<$wgMaxTocLevel ) {
3506                                         $toc .= $sk->tocLineEnd();
3507                                 }
3508                         }
3509
3510                         $levelCount[$toclevel] = $level;
3511
3512                         # count number of headlines for each level
3513                         @$sublevelCount[$toclevel]++;
3514                         $dot = 0;
3515                         for( $i = 1; $i <= $toclevel; $i++ ) {
3516                                 if( !empty( $sublevelCount[$i] ) ) {
3517                                         if( $dot ) {
3518                                                 $numbering .= '.';
3519                                         }
3520                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3521                                         $dot = 1;
3522                                 }
3523                         }
3524
3525                         # The safe header is a version of the header text safe to use for links
3526                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3527                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3528
3529                         # Remove link placeholders by the link text.
3530                         #     <!--LINK number-->
3531                         # turns into
3532                         #     link text with suffix
3533                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3534
3535                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3536                         $tocline = preg_replace(
3537                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3538                                 array( '',                          '<$1>'),
3539                                 $safeHeadline
3540                         );
3541                         $tocline = trim( $tocline );
3542
3543                         # For the anchor, strip out HTML-y stuff period
3544                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3545                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3546                         $safeHeadline = trim( $safeHeadline );
3547
3548                         # Save headline for section edit hint before it's escaped
3549                         $headlineHint = $safeHeadline;
3550
3551                         if ( $wgEnforceHtmlIds ) {
3552                                 $legacyHeadline = false;
3553                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3554                                         'noninitial' );
3555                         } else {
3556                                 # For reverse compatibility, provide an id that's
3557                                 # HTML4-compatible, like we used to.
3558                                 #
3559                                 # It may be worth noting, academically, that it's possible for
3560                                 # the legacy anchor to conflict with a non-legacy headline
3561                                 # anchor on the page.  In this case likely the "correct" thing
3562                                 # would be to either drop the legacy anchors or make sure
3563                                 # they're numbered first.  However, this would require people
3564                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3565                                 # manually, so let's not bother worrying about it.
3566                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3567                                         'noninitial' );
3568                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline, 'xml' );
3569
3570                                 if ( $legacyHeadline == $safeHeadline ) {
3571                                         # No reason to have both (in fact, we can't)
3572                                         $legacyHeadline = false;
3573                                 } elseif ( $legacyHeadline != Sanitizer::escapeId(
3574                                 $legacyHeadline, 'xml' ) ) {
3575                                         # The legacy id is invalid XML.  We used to allow this, but
3576                                         # there's no reason to do so anymore.  Backward
3577                                         # compatibility will fail slightly in this case, but it's
3578                                         # no big deal.
3579                                         $legacyHeadline = false;
3580                                 }
3581                         }
3582
3583                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3584                         # Does this apply to Unicode characters?  Because we aren't
3585                         # handling those here.
3586                         $arrayKey = strtolower( $safeHeadline );
3587                         if ( $legacyHeadline === false ) {
3588                                 $legacyArrayKey = false;
3589                         } else {
3590                                 $legacyArrayKey = strtolower( $legacyHeadline );
3591                         }
3592
3593                         # count how many in assoc. array so we can track dupes in anchors
3594                         if ( isset( $refers[$arrayKey] ) ) {
3595                                 $refers[$arrayKey]++;
3596                         } else {
3597                                 $refers[$arrayKey] = 1;
3598                         }
3599                         if ( isset( $refers[$legacyArrayKey] ) ) {
3600                                 $refers[$legacyArrayKey]++;
3601                         } else {
3602                                 $refers[$legacyArrayKey] = 1;
3603                         }
3604
3605                         # Don't number the heading if it is the only one (looks silly)
3606                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3607                                 # the two are different if the line contains a link
3608                                 $headline=$numbering . ' ' . $headline;
3609                         }
3610
3611                         # Create the anchor for linking from the TOC to the section
3612                         $anchor = $safeHeadline;
3613                         $legacyAnchor = $legacyHeadline;
3614                         if ( $refers[$arrayKey] > 1 ) {
3615                                 $anchor .= '_' . $refers[$arrayKey];
3616                         }
3617                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3618                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3619                         }
3620                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3621                                 $toc .= $sk->tocLine($anchor, $tocline,
3622                                         $numbering, $toclevel, ($isTemplate ? false : $sectionIndex));
3623                         }
3624
3625                         # Add the section to the section tree
3626                         # Find the DOM node for this header
3627                         while ( $node && !$isTemplate ) {
3628                                 if ( $node->getName() === 'h' ) {
3629                                         $bits = $node->splitHeading();
3630                                         if ( $bits['i'] == $sectionIndex )
3631                                                 break;
3632                                 }
3633                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3634                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3635                                 $node = $node->getNextSibling();
3636                         }
3637                         $tocraw[] = array(
3638                                 'toclevel' => $toclevel,
3639                                 'level' => $level,
3640                                 'line' => $tocline,
3641                                 'number' => $numbering,
3642                                 'index' => ($isTemplate ? 'T-' : '' ) . $sectionIndex,
3643                                 'fromtitle' => $titleText,
3644                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3645                                 'anchor' => $anchor,
3646                         );
3647
3648                         # give headline the correct <h#> tag
3649                         if( $showEditLink && $sectionIndex !== false ) {
3650                                 if( $isTemplate ) {
3651                                         # Put a T flag in the section identifier, to indicate to extractSections()
3652                                         # that sections inside <includeonly> should be counted.
3653                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3654                                 } else {
3655                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3656                                 }
3657                         } else {
3658                                 $editlink = '';
3659                         }
3660                         $head[$headlineCount] = $sk->makeHeadline( $level,
3661                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3662                                 $editlink, $legacyAnchor );
3663
3664                         $headlineCount++;
3665                 }
3666
3667                 $this->setOutputType( $oldType );
3668
3669                 # Never ever show TOC if no headers
3670                 if( $numVisible < 1 ) {
3671                         $enoughToc = false;
3672                 }
3673
3674                 if( $enoughToc ) {
3675                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3676                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3677                         }
3678                         $toc = $sk->tocList( $toc );
3679                         $this->mOutput->setTOCHTML( $toc );
3680                 }
3681
3682                 if ( $isMain ) {
3683                         $this->mOutput->setSections( $tocraw );
3684                 }
3685
3686                 # split up and insert constructed headlines
3687
3688                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3689                 $i = 0;
3690
3691                 foreach( $blocks as $block ) {
3692                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3693                                 # This is the [edit] link that appears for the top block of text when
3694                                 # section editing is enabled
3695
3696                                 # Disabled because it broke block formatting
3697                                 # For example, a bullet point in the top line
3698                                 # $full .= $sk->editSectionLink(0);
3699                         }
3700                         $full .= $block;
3701                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3702                                 # Top anchor now in skin
3703                                 $full = $full.$toc;
3704                         }
3705
3706                         if( !empty( $head[$i] ) ) {
3707                                 $full .= $head[$i];
3708                         }
3709                         $i++;
3710                 }
3711                 if( $this->mForceTocPosition ) {
3712                         return str_replace( '<!--MWTOC-->', $toc, $full );
3713                 } else {
3714                         return $full;
3715                 }
3716         }
3717
3718         /**
3719          * Merge $tree2 into $tree1 by replacing the section with index
3720          * $section in $tree1 and its descendants with the sections in $tree2.
3721          * Note that in the returned section tree, only the 'index' and
3722          * 'byteoffset' fields are guaranteed to be correct.
3723          * @param $tree1 array Section tree from ParserOutput::getSectons()
3724         *  @param $tree2 array Section tree
3725          * @param $section int Section index
3726          * @param $title Title Title both section trees come from
3727          * @param $len2 int Length of the original wikitext for $tree2
3728          * @return array Merged section tree
3729          */
3730         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3731                 global $wgContLang;
3732                 $newTree = array();
3733                 $targetLevel = false;
3734                 $merged = false;
3735                 $lastLevel = 1;
3736                 $nextIndex = 1;
3737                 $numbering = array( 0 );
3738                 $titletext = $title->getPrefixedDBkey();
3739                 foreach ( $tree1 as $s ) {
3740                         if ( $targetLevel !== false ) {
3741                                 if ( $s['level'] <= $targetLevel )
3742                                         // We've skipped enough
3743                                         $targetLevel = false;
3744                                 else
3745                                         continue;
3746                         }
3747                         if ( $s['index'] != $section ||
3748                                         $s['fromtitle'] != $titletext ) {
3749                                 self::incrementNumbering( $numbering,
3750                                         $s['toclevel'], $lastLevel );
3751
3752                                 // Rewrite index, byteoffset and number
3753                                 if ( $s['fromtitle'] == $titletext ) {
3754                                         $s['index'] = $nextIndex++;
3755                                         if ( $merged )
3756                                                 $s['byteoffset'] += $len2;
3757                                 }
3758                                 $s['number']  = implode( '.', array_map(
3759                                         array( $wgContLang, 'formatnum' ),
3760                                         $numbering ) );
3761                                 $lastLevel = $s['toclevel'];
3762                                 $newTree[] = $s;
3763                         } else {
3764                                 // We're at $section
3765                                 // Insert sections from $tree2 here
3766                                 foreach ( $tree2 as $s2 ) {
3767                                         // Rewrite the fields in $s2
3768                                         // before inserting it
3769                                         $s2['toclevel'] += $s['toclevel'] - 1;
3770                                         $s2['level'] += $s['level'] - 1;
3771                                         $s2['index'] = $nextIndex++;
3772                                         $s2['byteoffset'] += $s['byteoffset'];
3773
3774                                         self::incrementNumbering( $numbering,
3775                                                 $s2['toclevel'], $lastLevel );
3776                                         $s2['number']  = implode( '.', array_map(
3777                                                 array( $wgContLang, 'formatnum' ),
3778                                                 $numbering ) );
3779                                         $lastLevel = $s2['toclevel'];
3780                                         $newTree[] = $s2;
3781                                 }
3782                                 // Skip all descendants of $section in $tree1
3783                                 $targetLevel = $s['level'];
3784                                 $merged = true;
3785                         }
3786                 }
3787                 return $newTree;
3788         }
3789
3790         /**
3791          * Increment a section number. Helper function for mergeSectionTrees()
3792          * @param $number array Array representing a section number
3793          * @param $level int Current TOC level (depth)
3794          * @param $lastLevel int Level of previous TOC entry
3795          */
3796         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3797                 if ( $level > $lastLevel )
3798                         $number[$level - 1] = 1;
3799                 else if ( $level < $lastLevel ) {
3800                         foreach ( $number as $key => $unused )
3801                                 if ( $key >= $level )
3802                                         unset( $number[$key] );
3803                         $number[$level - 1]++;
3804                 } else
3805                         $number[$level - 1]++;
3806         }
3807
3808         /**
3809          * Transform wiki markup when saving a page by doing \r\n -> \n
3810          * conversion, substitting signatures, {{subst:}} templates, etc.
3811          *
3812          * @param string $text the text to transform
3813          * @param Title &$title the Title object for the current article
3814          * @param User $user the User object describing the current user
3815          * @param ParserOptions $options parsing options
3816          * @param bool $clearState whether to clear the parser state first
3817          * @return string the altered wiki markup
3818          * @public
3819          */
3820         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
3821                 $this->mOptions = $options;
3822                 $this->setTitle( $title );
3823                 $this->setOutputType( self::OT_WIKI );
3824
3825                 if ( $clearState ) {
3826                         $this->clearState();
3827                 }
3828
3829                 $pairs = array(
3830                         "\r\n" => "\n",
3831                 );
3832                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3833                 $text = $this->pstPass2( $text, $user );
3834                 $text = $this->mStripState->unstripBoth( $text );
3835                 return $text;
3836         }
3837
3838         /**
3839          * Pre-save transform helper function
3840          * @private
3841          */
3842         function pstPass2( $text, $user ) {
3843                 global $wgContLang, $wgLocaltimezone;
3844
3845                 /* Note: This is the timestamp saved as hardcoded wikitext to
3846                  * the database, we use $wgContLang here in order to give
3847                  * everyone the same signature and use the default one rather
3848                  * than the one selected in each user's preferences.
3849                  *
3850                  * (see also bug 12815)
3851                  */
3852                 $ts = $this->mOptions->getTimestamp();
3853                 $tz = wfMsgForContent( 'timezone-utc' );
3854                 if ( isset( $wgLocaltimezone ) ) {
3855                         $unixts = wfTimestamp( TS_UNIX, $ts );
3856                         $oldtz = getenv( 'TZ' );
3857                         putenv( 'TZ='.$wgLocaltimezone );
3858                         $ts = date( 'YmdHis', $unixts );
3859                         $tz = date( 'T', $unixts );  # might vary on DST changeover!
3860
3861                         /* Allow translation of timezones trough wiki. date() can return
3862                          * whatever crap the system uses, localised or not, so we cannot
3863                          * ship premade translations.
3864                          */
3865                         $key = 'timezone-' . strtolower( trim( $tz ) );
3866                         $value = wfMsgForContent( $key );
3867                         if ( !wfEmptyMsg( $key, $value ) ) $tz = $value;
3868
3869                         putenv( 'TZ='.$oldtz );
3870                 }
3871
3872                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tz)";
3873
3874                 # Variable replacement
3875                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3876                 $text = $this->replaceVariables( $text );
3877
3878                 # Signatures
3879                 $sigText = $this->getUserSig( $user );
3880                 $text = strtr( $text, array(
3881                         '~~~~~' => $d,
3882                         '~~~~' => "$sigText $d",
3883                         '~~~' => $sigText
3884                 ) );
3885
3886                 # Context links: [[|name]] and [[name (context)|]]
3887                 #
3888                 global $wgLegalTitleChars;
3889                 $tc = "[$wgLegalTitleChars]";
3890                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3891
3892                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3893                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
3894                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3895                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3896
3897                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3898                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3899                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
3900                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3901
3902                 $t = $this->mTitle->getText();
3903                 $m = array();
3904                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3905                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3906                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3907                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3908                 } else {
3909                         # if there's no context, don't bother duplicating the title
3910                         $text = preg_replace( $p2, '[[\\1]]', $text );
3911                 }
3912
3913                 # Trim trailing whitespace
3914                 $text = rtrim( $text );
3915
3916                 return $text;
3917         }
3918
3919         /**
3920          * Fetch the user's signature text, if any, and normalize to
3921          * validated, ready-to-insert wikitext.
3922          *
3923          * @param User $user
3924          * @return string
3925          * @private
3926          */
3927         function getUserSig( &$user ) {
3928                 global $wgMaxSigChars;
3929
3930                 $username = $user->getName();
3931                 $nickname = $user->getOption( 'nickname' );
3932                 $nickname = $nickname == null ? $username : $nickname;
3933
3934                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3935                         $nickname = $username;
3936                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3937                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3938                         # Sig. might contain markup; validate this
3939                         if( $this->validateSig( $nickname ) !== false ) {
3940                                 # Validated; clean up (if needed) and return it
3941                                 return $this->cleanSig( $nickname, true );
3942                         } else {
3943                                 # Failed to validate; fall back to the default
3944                                 $nickname = $username;
3945                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
3946                         }
3947                 }
3948
3949                 // Make sure nickname doesnt get a sig in a sig
3950                 $nickname = $this->cleanSigInSig( $nickname );
3951
3952                 # If we're still here, make it a link to the user page
3953                 $userText = wfEscapeWikiText( $username );
3954                 $nickText = wfEscapeWikiText( $nickname );
3955                 if ( $user->isAnon() )  {
3956                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3957                 } else {
3958                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3959                 }
3960         }
3961
3962         /**
3963          * Check that the user's signature contains no bad XML
3964          *
3965          * @param string $text
3966          * @return mixed An expanded string, or false if invalid.
3967          */
3968         function validateSig( $text ) {
3969                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
3970         }
3971
3972         /**
3973          * Clean up signature text
3974          *
3975          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3976          * 2) Substitute all transclusions
3977          *
3978          * @param string $text
3979          * @param $parsing Whether we're cleaning (preferences save) or parsing
3980          * @return string Signature text
3981          */
3982         function cleanSig( $text, $parsing = false ) {
3983                 if ( !$parsing ) {
3984                         global $wgTitle;
3985                         $this->clearState();
3986                         $this->setTitle( $wgTitle );
3987                         $this->mOptions = new ParserOptions;
3988                         $this->setOutputType = self::OT_PREPROCESS;
3989                 }
3990
3991                 # Option to disable this feature
3992                 if ( !$this->mOptions->getCleanSignatures() ) {
3993                         return $text;
3994                 }
3995
3996                 # FIXME: regex doesn't respect extension tags or nowiki
3997                 #  => Move this logic to braceSubstitution()
3998                 $substWord = MagicWord::get( 'subst' );
3999                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4000                 $substText = '{{' . $substWord->getSynonym( 0 );
4001
4002                 $text = preg_replace( $substRegex, $substText, $text );
4003                 $text = $this->cleanSigInSig( $text );
4004                 $dom = $this->preprocessToDom( $text );
4005                 $frame = $this->getPreprocessor()->newFrame();
4006                 $text = $frame->expand( $dom );
4007
4008                 if ( !$parsing ) {
4009                         $text = $this->mStripState->unstripBoth( $text );
4010                 }
4011
4012                 return $text;
4013         }
4014
4015         /**
4016          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4017          * @param string $text
4018          * @return string Signature text with /~{3,5}/ removed
4019          */
4020         function cleanSigInSig( $text ) {
4021                 $text = preg_replace( '/~{3,5}/', '', $text );
4022                 return $text;
4023         }
4024
4025         /**
4026          * Set up some variables which are usually set up in parse()
4027          * so that an external function can call some class members with confidence
4028          * @public
4029          */
4030         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4031                 $this->setTitle( $title );
4032                 $this->mOptions = $options;
4033                 $this->setOutputType( $outputType );
4034                 if ( $clearState ) {
4035                         $this->clearState();
4036                 }
4037         }
4038
4039         /**
4040          * Wrapper for preprocess()
4041          *
4042          * @param string $text the text to preprocess
4043          * @param ParserOptions $options  options
4044          * @return string
4045          * @public
4046          */
4047         function transformMsg( $text, $options ) {
4048                 global $wgTitle;
4049                 static $executing = false;
4050
4051                 # Guard against infinite recursion
4052                 if ( $executing ) {
4053                         return $text;
4054                 }
4055                 $executing = true;
4056
4057                 wfProfileIn(__METHOD__);
4058                 $text = $this->preprocess( $text, $wgTitle, $options );
4059
4060                 $executing = false;
4061                 wfProfileOut(__METHOD__);
4062                 return $text;
4063         }
4064
4065         /**
4066          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4067          * The callback should have the following form:
4068          *    function myParserHook( $text, $params, &$parser ) { ... }
4069          *
4070          * Transform and return $text. Use $parser for any required context, e.g. use
4071          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4072          *
4073          * @public
4074          *
4075          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4076          * @param mixed $callback The callback function (and object) to use for the tag
4077          *
4078          * @return The old value of the mTagHooks array associated with the hook
4079          */
4080         function setHook( $tag, $callback ) {
4081                 $tag = strtolower( $tag );
4082                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4083                 $this->mTagHooks[$tag] = $callback;
4084                 if( !in_array( $tag, $this->mStripList ) ) {
4085                         $this->mStripList[] = $tag;
4086                 }
4087
4088                 return $oldVal;
4089         }
4090
4091         function setTransparentTagHook( $tag, $callback ) {
4092                 $tag = strtolower( $tag );
4093                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4094                 $this->mTransparentTagHooks[$tag] = $callback;
4095
4096                 return $oldVal;
4097         }
4098
4099         /**
4100          * Remove all tag hooks
4101          */
4102         function clearTagHooks() {
4103                 $this->mTagHooks = array();
4104                 $this->mStripList = $this->mDefaultStripList;
4105         }
4106
4107         /**
4108          * Create a function, e.g. {{sum:1|2|3}}
4109          * The callback function should have the form:
4110          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4111          *
4112          * Or with SFH_OBJECT_ARGS:
4113          *    function myParserFunction( $parser, $frame, $args ) { ... }
4114          *
4115          * The callback may either return the text result of the function, or an array with the text
4116          * in element 0, and a number of flags in the other elements. The names of the flags are
4117          * specified in the keys. Valid flags are:
4118          *   found                     The text returned is valid, stop processing the template. This
4119          *                             is on by default.
4120          *   nowiki                    Wiki markup in the return value should be escaped
4121          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4122          *
4123          * @public
4124          *
4125          * @param string $id The magic word ID
4126          * @param mixed $callback The callback function (and object) to use
4127          * @param integer $flags a combination of the following flags:
4128          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4129          *
4130          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4131          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4132          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4133          *     the arguments, and to control the way they are expanded.
4134          *
4135          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4136          *     arguments, for instance:
4137          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4138          *
4139          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4140          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4141          *     working if/when this is changed.
4142          *
4143          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4144          *     expansion.
4145          *
4146          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4147          *     about the methods available in PPFrame and PPNode.
4148          *
4149          * @return The old callback function for this name, if any
4150          */
4151         function setFunctionHook( $id, $callback, $flags = 0 ) {
4152                 global $wgContLang;
4153
4154                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4155                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4156
4157                 # Add to function cache
4158                 $mw = MagicWord::get( $id );
4159                 if( !$mw )
4160                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4161
4162                 $synonyms = $mw->getSynonyms();
4163                 $sensitive = intval( $mw->isCaseSensitive() );
4164
4165                 foreach ( $synonyms as $syn ) {
4166                         # Case
4167                         if ( !$sensitive ) {
4168                                 $syn = $wgContLang->lc( $syn );
4169                         }
4170                         # Add leading hash
4171                         if ( !( $flags & SFH_NO_HASH ) ) {
4172                                 $syn = '#' . $syn;
4173                         }
4174                         # Remove trailing colon
4175                         if ( substr( $syn, -1, 1 ) === ':' ) {
4176                                 $syn = substr( $syn, 0, -1 );
4177                         }
4178                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4179                 }
4180                 return $oldVal;
4181         }
4182
4183         /**
4184          * Get all registered function hook identifiers
4185          *
4186          * @return array
4187          */
4188         function getFunctionHooks() {
4189                 return array_keys( $this->mFunctionHooks );
4190         }
4191
4192         /**
4193          * Create a tag function, e.g. <test>some stuff</test>.
4194          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4195          * Unlike parser functions, their content is not preprocessed.
4196          */
4197         function setFunctionTagHook( $tag, $callback, $flags ) {
4198                 $tag = strtolower( $tag );
4199                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4200                         $this->mFunctionTagHooks[$tag] : null;
4201                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4202
4203                 if( !in_array( $tag, $this->mStripList ) ) {
4204                         $this->mStripList[] = $tag;
4205                 }
4206
4207                 return $old;
4208         }
4209
4210         /**
4211          * FIXME: update documentation. makeLinkObj() is deprecated.
4212          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4213          * Placeholders created in Skin::makeLinkObj()
4214          * Returns an array of link CSS classes, indexed by PDBK.
4215          */
4216         function replaceLinkHolders( &$text, $options = 0 ) {
4217                 return $this->mLinkHolders->replace( $text );
4218         }
4219
4220         /**
4221          * Replace <!--LINK--> link placeholders with plain text of links
4222          * (not HTML-formatted).
4223          * @param string $text
4224          * @return string
4225          */
4226         function replaceLinkHoldersText( $text ) {
4227                 return $this->mLinkHolders->replaceText( $text );
4228         }
4229
4230         /**
4231          * Tag hook handler for 'pre'.
4232          */
4233         function renderPreTag( $text, $attribs ) {
4234                 // Backwards-compatibility hack
4235                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4236
4237                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4238                 return Xml::openElement( 'pre', $attribs ) .
4239                         Xml::escapeTagsOnly( $content ) .
4240                         '</pre>';
4241         }
4242
4243         /**
4244          * Renders an image gallery from a text with one line per image.
4245          * text labels may be given by using |-style alternative text. E.g.
4246          *   Image:one.jpg|The number "1"
4247          *   Image:tree.jpg|A tree
4248          * given as text will return the HTML of a gallery with two images,
4249          * labeled 'The number "1"' and
4250          * 'A tree'.
4251          */
4252         function renderImageGallery( $text, $params ) {
4253                 $ig = new ImageGallery();
4254                 $ig->setContextTitle( $this->mTitle );
4255                 $ig->setShowBytes( false );
4256                 $ig->setShowFilename( false );
4257                 $ig->setParser( $this );
4258                 $ig->setHideBadImages();
4259                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4260                 $ig->useSkin( $this->mOptions->getSkin() );
4261                 $ig->mRevisionId = $this->mRevisionId;
4262
4263                 if( isset( $params['caption'] ) ) {
4264                         $caption = $params['caption'];
4265                         $caption = htmlspecialchars( $caption );
4266                         $caption = $this->replaceInternalLinks( $caption );
4267                         $ig->setCaptionHtml( $caption );
4268                 }
4269                 if( isset( $params['perrow'] ) ) {
4270                         $ig->setPerRow( $params['perrow'] );
4271                 }
4272                 if( isset( $params['widths'] ) ) {
4273                         $ig->setWidths( $params['widths'] );
4274                 }
4275                 if( isset( $params['heights'] ) ) {
4276                         $ig->setHeights( $params['heights'] );
4277                 }
4278
4279                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4280
4281                 $lines = StringUtils::explode( "\n", $text );
4282                 foreach ( $lines as $line ) {
4283                         # match lines like these:
4284                         # Image:someimage.jpg|This is some image
4285                         $matches = array();
4286                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4287                         # Skip empty lines
4288                         if ( count( $matches ) == 0 ) {
4289                                 continue;
4290                         }
4291
4292                         if ( strpos( $matches[0], '%' ) !== false )
4293                                 $matches[1] = urldecode( $matches[1] );
4294                         $tp = Title::newFromText( $matches[1]/*, NS_FILE*/ );
4295                         $nt =& $tp;
4296                         if( is_null( $nt ) ) {
4297                                 # Bogus title. Ignore these so we don't bomb out later.
4298                                 continue;
4299                         }
4300                         if ( isset( $matches[3] ) ) {
4301                                 $label = $matches[3];
4302                         } else {
4303                                 $label = '';
4304                         }
4305
4306                         $html = $this->recursiveTagParse( trim( $label ) );
4307
4308                         $ig->add( $nt, $html );
4309
4310                         # Only add real images (bug #5586)
4311                         if ( $nt->getNamespace() == NS_FILE ) {
4312                                 $this->mOutput->addImage( $nt->getDBkey() );
4313                         }
4314                 }
4315                 return $ig->toHTML();
4316         }
4317
4318         function getImageParams( $handler ) {
4319                 if ( $handler ) {
4320                         $handlerClass = get_class( $handler );
4321                 } else {
4322                         $handlerClass = '';
4323                 }
4324                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4325                         // Initialise static lists
4326                         static $internalParamNames = array(
4327                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4328                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4329                                         'bottom', 'text-bottom' ),
4330                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4331                                         'upright', 'border', 'link', 'alt' ),
4332                         );
4333                         static $internalParamMap;
4334                         if ( !$internalParamMap ) {
4335                                 $internalParamMap = array();
4336                                 foreach ( $internalParamNames as $type => $names ) {
4337                                         foreach ( $names as $name ) {
4338                                                 $magicName = str_replace( '-', '_', "img_$name" );
4339                                                 $internalParamMap[$magicName] = array( $type, $name );
4340                                         }
4341                                 }
4342                         }
4343
4344                         // Add handler params
4345                         $paramMap = $internalParamMap;
4346                         if ( $handler ) {
4347                                 $handlerParamMap = $handler->getParamMap();
4348                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4349                                         $paramMap[$magic] = array( 'handler', $paramName );
4350                                 }
4351                         }
4352                         $this->mImageParams[$handlerClass] = $paramMap;
4353                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4354                 }
4355                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4356         }
4357
4358         /**
4359          * Parse image options text and use it to make an image
4360          * @param Title $title
4361          * @param string $options
4362          * @param LinkHolderArray $holders
4363          */
4364         function makeImage( $title, $options, $holders = false ) {
4365                 # Check if the options text is of the form "options|alt text"
4366                 # Options are:
4367                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4368                 #  * left       no resizing, just left align. label is used for alt= only
4369                 #  * right      same, but right aligned
4370                 #  * none       same, but not aligned
4371                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4372                 #  * center     center the image
4373                 #  * frame      Keep original image size, no magnify-button.
4374                 #  * framed     Same as "frame"
4375                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4376                 #  * upright    reduce width for upright images, rounded to full __0 px
4377                 #  * border     draw a 1px border around the image
4378                 #  * alt        Text for HTML alt attribute (defaults to empty)
4379                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4380                 # vertical-align values (no % or length right now):
4381                 #  * baseline
4382                 #  * sub
4383                 #  * super
4384                 #  * top
4385                 #  * text-top
4386                 #  * middle
4387                 #  * bottom
4388                 #  * text-bottom
4389
4390                 $parts = StringUtils::explode( "|", $options );
4391                 $sk = $this->mOptions->getSkin();
4392
4393                 # Give extensions a chance to select the file revision for us
4394                 $skip = $time = $descQuery = false;
4395                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4396
4397                 if ( $skip ) {
4398                         return $sk->link( $title );
4399                 }
4400
4401                 # Get the file
4402                 $imagename = $title->getDBkey();
4403                 $file = wfFindFile( $title, array( 'time' => $time ) );
4404                 # Get parameter map
4405                 $handler = $file ? $file->getHandler() : false;
4406
4407                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4408
4409                 # Process the input parameters
4410                 $caption = '';
4411                 $params = array( 'frame' => array(), 'handler' => array(),
4412                         'horizAlign' => array(), 'vertAlign' => array() );
4413                 foreach( $parts as $part ) {
4414                         $part = trim( $part );
4415                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4416                         $validated = false;
4417                         if( isset( $paramMap[$magicName] ) ) {
4418                                 list( $type, $paramName ) = $paramMap[$magicName];
4419
4420                                 // Special case; width and height come in one variable together
4421                                 if( $type === 'handler' && $paramName === 'width' ) {
4422                                         $m = array();
4423                                         # (bug 13500) In both cases (width/height and width only),
4424                                         # permit trailing "px" for backward compatibility.
4425                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4426                                                 $width = intval( $m[1] );
4427                                                 $height = intval( $m[2] );
4428                                                 if ( $handler->validateParam( 'width', $width ) ) {
4429                                                         $params[$type]['width'] = $width;
4430                                                         $validated = true;
4431                                                 }
4432                                                 if ( $handler->validateParam( 'height', $height ) ) {
4433                                                         $params[$type]['height'] = $height;
4434                                                         $validated = true;
4435                                                 }
4436                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4437                                                 $width = intval( $value );
4438                                                 if ( $handler->validateParam( 'width', $width ) ) {
4439                                                         $params[$type]['width'] = $width;
4440                                                         $validated = true;
4441                                                 }
4442                                         } // else no validation -- bug 13436
4443                                 } else {
4444                                         if ( $type === 'handler' ) {
4445                                                 # Validate handler parameter
4446                                                 $validated = $handler->validateParam( $paramName, $value );
4447                                         } else {
4448                                                 # Validate internal parameters
4449                                                 switch( $paramName ) {
4450                                                 case 'manualthumb':
4451                                                 case 'alt':
4452                                                         // @fixme - possibly check validity here for
4453                                                         // manualthumb? downstream behavior seems odd with
4454                                                         // missing manual thumbs.
4455                                                         $validated = true;
4456                                                         $value = $this->stripAltText( $value, $holders );
4457                                                         break;
4458                                                 case 'link':
4459                                                         $chars = self::EXT_LINK_URL_CLASS;
4460                                                         $prots = $this->mUrlProtocols;
4461                                                         if ( $value === '' ) {
4462                                                                 $paramName = 'no-link';
4463                                                                 $value = true;
4464                                                                 $validated = true;
4465                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4466                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4467                                                                         $paramName = 'link-url';
4468                                                                         $this->mOutput->addExternalLink( $value );
4469                                                                         $validated = true;
4470                                                                 }
4471                                                         } else {
4472                                                                 $linkTitle = Title::newFromText( $value );
4473                                                                 if ( $linkTitle ) {
4474                                                                         $paramName = 'link-title';
4475                                                                         $value = $linkTitle;
4476                                                                         $this->mOutput->addLink( $linkTitle );
4477                                                                         $validated = true;
4478                                                                 }
4479                                                         }
4480                                                         break;
4481                                                 default:
4482                                                         // Most other things appear to be empty or numeric...
4483                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4484                                                 }
4485                                         }
4486
4487                                         if ( $validated ) {
4488                                                 $params[$type][$paramName] = $value;
4489                                         }
4490                                 }
4491                         }
4492                         if ( !$validated ) {
4493                                 $caption = $part;
4494                         }
4495                 }
4496
4497                 # Process alignment parameters
4498                 if ( $params['horizAlign'] ) {
4499                         $params['frame']['align'] = key( $params['horizAlign'] );
4500                 }
4501                 if ( $params['vertAlign'] ) {
4502                         $params['frame']['valign'] = key( $params['vertAlign'] );
4503                 }
4504
4505                 $params['frame']['caption'] = $caption;
4506
4507                 # Will the image be presented in a frame, with the caption below?
4508                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4509                                  isset( $params['frame']['framed'] ) ||
4510                                  isset( $params['frame']['thumbnail'] ) ||
4511                                  isset( $params['frame']['manualthumb'] );
4512
4513                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4514                 # came to also set the caption, ordinary text after the image -- which
4515                 # makes no sense, because that just repeats the text multiple times in
4516                 # screen readers.  It *also* came to set the title attribute.
4517                 #
4518                 # Now that we have an alt attribute, we should not set the alt text to
4519                 # equal the caption: that's worse than useless, it just repeats the
4520                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4521                 # use the unnamed parameter for alt text as well, just for the time be-
4522                 # ing, if the unnamed param is set and the alt param is not.
4523                 #
4524                 # For the future, we need to figure out if we want to tweak this more,
4525                 # e.g., introducing a title= parameter for the title; ignoring the un-
4526                 # named parameter entirely for images without a caption; adding an ex-
4527                 # plicit caption= parameter and preserving the old magic unnamed para-
4528                 # meter for BC; ...
4529                 if ( $imageIsFramed ) { # Framed image
4530                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4531                                 # No caption or alt text, add the filename as the alt text so
4532                                 # that screen readers at least get some description of the image
4533                                 $params['frame']['alt'] = $title->getText();
4534                         }
4535                         # Do not set $params['frame']['title'] because tooltips don't make sense
4536                         # for framed images
4537                 } else { # Inline image
4538                         if ( !isset( $params['frame']['alt'] ) ) {
4539                                 # No alt text, use the "caption" for the alt text
4540                                 if ( $caption !== '') {
4541                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4542                                 } else {
4543                                         # No caption, fall back to using the filename for the
4544                                         # alt text
4545                                         $params['frame']['alt'] = $title->getText();
4546                                 }
4547                         }
4548                         # Use the "caption" for the tooltip text
4549                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4550                 }
4551
4552                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4553
4554                 # Linker does the rest
4555                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4556
4557                 # Give the handler a chance to modify the parser object
4558                 if ( $handler ) {
4559                         $handler->parserTransformHook( $this, $file );
4560                 }
4561
4562                 return $ret;
4563         }
4564
4565         protected function stripAltText( $caption, $holders ) {
4566                 # Strip bad stuff out of the title (tooltip).  We can't just use
4567                 # replaceLinkHoldersText() here, because if this function is called
4568                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4569                 if ( $holders ) {
4570                         $tooltip = $holders->replaceText( $caption );
4571                 } else {
4572                         $tooltip = $this->replaceLinkHoldersText( $caption );
4573                 }
4574
4575                 # make sure there are no placeholders in thumbnail attributes
4576                 # that are later expanded to html- so expand them now and
4577                 # remove the tags
4578                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4579                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4580
4581                 return $tooltip;
4582         }
4583
4584         /**
4585          * Set a flag in the output object indicating that the content is dynamic and
4586          * shouldn't be cached.
4587          */
4588         function disableCache() {
4589                 wfDebug( "Parser output marked as uncacheable.\n" );
4590                 $this->mOutput->mCacheTime = -1;
4591         }
4592
4593         /**#@+
4594          * Callback from the Sanitizer for expanding items found in HTML attribute
4595          * values, so they can be safely tested and escaped.
4596          * @param string $text
4597          * @param PPFrame $frame
4598          * @return string
4599          * @private
4600          */
4601         function attributeStripCallback( &$text, $frame = false ) {
4602                 $text = $this->replaceVariables( $text, $frame );
4603                 $text = $this->mStripState->unstripBoth( $text );
4604                 return $text;
4605         }
4606
4607         /**#@-*/
4608
4609         /**#@+
4610          * Accessor/mutator
4611          */
4612         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4613         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4614         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4615         /**#@-*/
4616
4617         /**#@+
4618          * Accessor
4619          */
4620         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4621         /**#@-*/
4622
4623
4624         /**
4625          * Break wikitext input into sections, and either pull or replace
4626          * some particular section's text.
4627          *
4628          * External callers should use the getSection and replaceSection methods.
4629          *
4630          * @param string $text Page wikitext
4631          * @param string $section A section identifier string of the form:
4632          *   <flag1> - <flag2> - ... - <section number>
4633          *
4634          * Currently the only recognised flag is "T", which means the target section number
4635          * was derived during a template inclusion parse, in other words this is a template
4636          * section edit link. If no flags are given, it was an ordinary section edit link.
4637          * This flag is required to avoid a section numbering mismatch when a section is
4638          * enclosed by <includeonly> (bug 6563).
4639          *
4640          * The section number 0 pulls the text before the first heading; other numbers will
4641          * pull the given section along with its lower-level subsections. If the section is
4642          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4643          *
4644          * @param string $mode One of "get" or "replace"
4645          * @param string $newText Replacement text for section data.
4646          * @return string for "get", the extracted section text.
4647          *                for "replace", the whole page with the section replaced.
4648          */
4649         private function extractSections( $text, $section, $mode, $newText='' ) {
4650                 global $wgTitle;
4651                 $this->clearState();
4652                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4653                 $this->mOptions = new ParserOptions;
4654                 $this->setOutputType( self::OT_WIKI );
4655                 $outText = '';
4656                 $frame = $this->getPreprocessor()->newFrame();
4657
4658                 // Process section extraction flags
4659                 $flags = 0;
4660                 $sectionParts = explode( '-', $section );
4661                 $sectionIndex = array_pop( $sectionParts );
4662                 foreach ( $sectionParts as $part ) {
4663                         if ( $part === 'T' ) {
4664                                 $flags |= self::PTD_FOR_INCLUSION;
4665                         }
4666                 }
4667                 // Preprocess the text
4668                 $root = $this->preprocessToDom( $text, $flags );
4669
4670                 // <h> nodes indicate section breaks
4671                 // They can only occur at the top level, so we can find them by iterating the root's children
4672                 $node = $root->getFirstChild();
4673
4674                 // Find the target section
4675                 if ( $sectionIndex == 0 ) {
4676                         // Section zero doesn't nest, level=big
4677                         $targetLevel = 1000;
4678                 } else {
4679             while ( $node ) {
4680                 if ( $node->getName() === 'h' ) {
4681                     $bits = $node->splitHeading();
4682                                         if ( $bits['i'] == $sectionIndex ) {
4683                                         $targetLevel = $bits['level'];
4684                                                 break;
4685                                         }
4686                                 }
4687                                 if ( $mode === 'replace' ) {
4688                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4689                                 }
4690                                 $node = $node->getNextSibling();
4691                         }
4692                 }
4693
4694                 if ( !$node ) {
4695                         // Not found
4696                         if ( $mode === 'get' ) {
4697                                 return $newText;
4698                         } else {
4699                                 return $text;
4700                         }
4701                 }
4702
4703                 // Find the end of the section, including nested sections
4704                 do {
4705                         if ( $node->getName() === 'h' ) {
4706                                 $bits = $node->splitHeading();
4707                                 $curLevel = $bits['level'];
4708                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4709                                         break;
4710                                 }
4711                         }
4712                         if ( $mode === 'get' ) {
4713                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4714                         }
4715                         $node = $node->getNextSibling();
4716                 } while ( $node );
4717
4718                 // Write out the remainder (in replace mode only)
4719                 if ( $mode === 'replace' ) {
4720                         // Output the replacement text
4721                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4722                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4723                         // Only add trailing whitespace if there is newText
4724                         if($newText != "") {
4725                                 $outText .= $newText . "\n\n";
4726                         }
4727
4728                         while ( $node ) {
4729                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4730                                 $node = $node->getNextSibling();
4731                         }
4732                 }
4733
4734                 if ( is_string( $outText ) ) {
4735                         // Re-insert stripped tags
4736                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4737                 }
4738
4739                 return $outText;
4740         }
4741
4742         /**
4743          * This function returns the text of a section, specified by a number ($section).
4744          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4745          * the first section before any such heading (section 0).
4746          *
4747          * If a section contains subsections, these are also returned.
4748          *
4749          * @param string $text text to look in
4750          * @param string $section section identifier
4751          * @param string $deftext default to return if section is not found
4752          * @return string text of the requested section
4753          */
4754         public function getSection( $text, $section, $deftext='' ) {
4755                 return $this->extractSections( $text, $section, "get", $deftext );
4756         }
4757
4758         public function replaceSection( $oldtext, $section, $text ) {
4759                 return $this->extractSections( $oldtext, $section, "replace", $text );
4760         }
4761
4762         /**
4763          * Get the timestamp associated with the current revision, adjusted for
4764          * the default server-local timestamp
4765          */
4766         function getRevisionTimestamp() {
4767                 if ( is_null( $this->mRevisionTimestamp ) ) {
4768                         wfProfileIn( __METHOD__ );
4769                         global $wgContLang;
4770                         $dbr = wfGetDB( DB_SLAVE );
4771                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4772                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4773
4774                         // Normalize timestamp to internal MW format for timezone processing.
4775                         // This has the added side-effect of replacing a null value with
4776                         // the current time, which gives us more sensible behavior for
4777                         // previews.
4778                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4779
4780                         // The cryptic '' timezone parameter tells to use the site-default
4781                         // timezone offset instead of the user settings.
4782                         //
4783                         // Since this value will be saved into the parser cache, served
4784                         // to other users, and potentially even used inside links and such,
4785                         // it needs to be consistent for all visitors.
4786                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4787
4788                         wfProfileOut( __METHOD__ );
4789                 }
4790                 return $this->mRevisionTimestamp;
4791         }
4792
4793         /**
4794          * Get the name of the user that edited the last revision
4795          */
4796         function getRevisionUser() {
4797                 // if this template is subst: the revision id will be blank,
4798                 // so just use the current user's name
4799                 if( $this->mRevisionId ) {
4800                         $revision = Revision::newFromId( $this->mRevisionId );
4801                         $revuser = $revision->getUserText();
4802                 } else {
4803                         global $wgUser;
4804                         $revuser = $wgUser->getName();
4805                 }
4806                 return $revuser;
4807         }
4808
4809         /**
4810          * Mutator for $mDefaultSort
4811          *
4812          * @param $sort New value
4813          */
4814         public function setDefaultSort( $sort ) {
4815                 $this->mDefaultSort = $sort;
4816         }
4817
4818         /**
4819          * Accessor for $mDefaultSort
4820          * Will use the title/prefixed title if none is set
4821          *
4822          * @return string
4823          */
4824         public function getDefaultSort() {
4825                 global $wgCategoryPrefixedDefaultSortkey;
4826                 if( $this->mDefaultSort !== false ) {
4827                         return $this->mDefaultSort;
4828                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4829                         !$wgCategoryPrefixedDefaultSortkey) {
4830                         return $this->mTitle->getText();
4831                 } else {
4832                         return $this->mTitle->getPrefixedText();
4833                 }
4834         }
4835
4836         /**
4837          * Accessor for $mDefaultSort
4838          * Unlike getDefaultSort(), will return false if none is set
4839          *
4840          * @return string or false
4841          */
4842         public function getCustomDefaultSort() {
4843                 return $this->mDefaultSort;
4844         }
4845
4846         /**
4847          * Try to guess the section anchor name based on a wikitext fragment
4848          * presumably extracted from a heading, for example "Header" from
4849          * "== Header ==".
4850          */
4851         public function guessSectionNameFromWikiText( $text ) {
4852                 # Strip out wikitext links(they break the anchor)
4853                 $text = $this->stripSectionName( $text );
4854                 $headline = Sanitizer::decodeCharReferences( $text );
4855                 # strip out HTML
4856                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4857                 $headline = trim( $headline );
4858                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4859                 $replacearray = array(
4860                         '%3A' => ':',
4861                         '%' => '.'
4862                 );
4863                 return str_replace(
4864                         array_keys( $replacearray ),
4865                         array_values( $replacearray ),
4866                         $sectionanchor );
4867         }
4868
4869         /**
4870          * Strips a text string of wikitext for use in a section anchor
4871          *
4872          * Accepts a text string and then removes all wikitext from the
4873          * string and leaves only the resultant text (i.e. the result of
4874          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4875          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4876          * to create valid section anchors by mimicing the output of the
4877          * parser when headings are parsed.
4878          *
4879          * @param $text string Text string to be stripped of wikitext
4880          * for use in a Section anchor
4881          * @return Filtered text string
4882          */
4883         public function stripSectionName( $text ) {
4884                 # Strip internal link markup
4885                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4886                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4887
4888                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4889                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4890                 # on how many empty links there are on the page - need to figure that out.
4891                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4892
4893                 # Parse wikitext quotes (italics & bold)
4894                 $text = $this->doQuotes($text);
4895
4896                 # Strip HTML tags
4897                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4898                 return $text;
4899         }
4900
4901         function srvus( $text ) {
4902                 return $this->testSrvus( $text, $this->mOutputType );
4903         }
4904
4905         /**
4906          * strip/replaceVariables/unstrip for preprocessor regression testing
4907          */
4908         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
4909                 $this->clearState();
4910                 if ( ! ( $title instanceof Title ) ) {
4911                         $title = Title::newFromText( $title );
4912                 }
4913                 $this->mTitle = $title;
4914                 $this->mOptions = $options;
4915                 $this->setOutputType( $outputType );
4916                 $text = $this->replaceVariables( $text );
4917                 $text = $this->mStripState->unstripBoth( $text );
4918                 $text = Sanitizer::removeHTMLtags( $text );
4919                 return $text;
4920         }
4921
4922         function testPst( $text, $title, $options ) {
4923                 global $wgUser;
4924                 if ( ! ( $title instanceof Title ) ) {
4925                         $title = Title::newFromText( $title );
4926                 }
4927                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
4928         }
4929
4930         function testPreprocess( $text, $title, $options ) {
4931                 if ( ! ( $title instanceof Title ) ) {
4932                         $title = Title::newFromText( $title );
4933                 }
4934                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
4935         }
4936
4937         function markerSkipCallback( $s, $callback ) {
4938                 $i = 0;
4939                 $out = '';
4940                 while ( $i < strlen( $s ) ) {
4941                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
4942                         if ( $markerStart === false ) {
4943                                 $out .= call_user_func( $callback, substr( $s, $i ) );
4944                                 break;
4945                         } else {
4946                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
4947                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
4948                                 if ( $markerEnd === false ) {
4949                                         $out .= substr( $s, $markerStart );
4950                                         break;
4951                                 } else {
4952                                         $markerEnd += strlen( self::MARKER_SUFFIX );
4953                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
4954                                         $i = $markerEnd;
4955                                 }
4956                         }
4957                 }
4958                 return $out;
4959         }
4960
4961         function serialiseHalfParsedText( $text ) {
4962                 $data = array();
4963                 $data['text'] = $text;
4964
4965                 // First, find all strip markers, and store their
4966                 //  data in an array.
4967                 $stripState = new StripState;
4968                 $pos = 0;
4969                 while( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) ) && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) ) {
4970                         $end_pos += strlen( self::MARKER_SUFFIX );
4971                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
4972
4973                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
4974                                 $replaceArray = $stripState->general;
4975                                 $stripText = $this->mStripState->general->data[$marker];
4976                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
4977                                 $replaceArray = $stripState->nowiki;
4978                                 $stripText = $this->mStripState->nowiki->data[$marker];
4979                         } else {
4980                                 throw new MWException( "Hanging strip marker: '$marker'." );
4981                         }
4982
4983                         $replaceArray->setPair( $marker, $stripText );
4984                         $pos = $end_pos;
4985                 }
4986                 $data['stripstate'] = $stripState;
4987
4988                 // Now, find all of our links, and store THEIR
4989                 //  data in an array! :)
4990                 $links = array( 'internal' => array(), 'interwiki' => array() );
4991                 $pos = 0;
4992
4993                 // Internal links
4994                 while( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
4995                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
4996
4997                         $ns = trim($ns);
4998                         if (empty( $links['internal'][$ns] )) {
4999                                 $links['internal'][$ns] = array();
5000                         }
5001
5002                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5003                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5004                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5005                 }
5006
5007                 $pos = 0;
5008
5009                 // Interwiki links
5010                 while( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5011                         $data = substr( $text, $start_pos );
5012                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5013                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5014                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5015                 }
5016
5017                 $data['linkholder'] = $links;
5018
5019                 return $data;
5020         }
5021
5022         function unserialiseHalfParsedText( $data, $intPrefix = null /* Unique identifying prefix */ ) {
5023                 if (!$intPrefix)
5024                         $intPrefix = $this->getRandomString();
5025
5026                 // First, extract the strip state.
5027                 $stripState = $data['stripstate'];
5028                 $this->mStripState->general->merge( $stripState->general );
5029                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5030
5031                 // Now, extract the text, and renumber links
5032                 $text = $data['text'];
5033                 $links = $data['linkholder'];
5034
5035                 // Internal...
5036                 foreach( $links['internal'] as $ns => $nsLinks ) {
5037                         foreach( $nsLinks as $key => $entry ) {
5038                                 $newKey = $intPrefix . '-' . $key;
5039                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5040
5041                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5042                         }
5043                 }
5044
5045                 // Interwiki...
5046                 foreach( $links['interwiki'] as $key => $entry ) {
5047                         $newKey = "$intPrefix-$key";
5048                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5049
5050                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5051                 }
5052
5053                 // Should be good to go.
5054                 return $text;
5055         }
5056 }
5057
5058 /**
5059  * @todo document, briefly.
5060  * @ingroup Parser
5061  */
5062 class StripState {
5063         var $general, $nowiki;
5064
5065         function __construct() {
5066                 $this->general = new ReplacementArray;
5067                 $this->nowiki = new ReplacementArray;
5068         }
5069
5070         function unstripGeneral( $text ) {
5071                 wfProfileIn( __METHOD__ );
5072                 do {
5073                         $oldText = $text;
5074                         $text = $this->general->replace( $text );
5075                 } while ( $text !== $oldText );
5076                 wfProfileOut( __METHOD__ );
5077                 return $text;
5078         }
5079
5080         function unstripNoWiki( $text ) {
5081                 wfProfileIn( __METHOD__ );
5082                 do {
5083                         $oldText = $text;
5084                         $text = $this->nowiki->replace( $text );
5085                 } while ( $text !== $oldText );
5086                 wfProfileOut( __METHOD__ );
5087                 return $text;
5088         }
5089
5090         function unstripBoth( $text ) {
5091                 wfProfileIn( __METHOD__ );
5092                 do {
5093                         $oldText = $text;
5094                         $text = $this->general->replace( $text );
5095                         $text = $this->nowiki->replace( $text );
5096                 } while ( $text !== $oldText );
5097                 wfProfileOut( __METHOD__ );
5098                 return $text;
5099         }
5100 }
5101
5102 /**
5103  * @todo document, briefly.
5104  * @ingroup Parser
5105  */
5106 class OnlyIncludeReplacer {
5107         var $output = '';
5108
5109         function replace( $matches ) {
5110                 if ( substr( $matches[1], -1 ) === "\n" ) {
5111                         $this->output .= substr( $matches[1], 0, -1 );
5112                 } else {
5113                         $this->output .= $matches[1];
5114                 }
5115         }
5116 }