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
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 100         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101         var $mLinkHolders, $mLinkID;
 102         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 103         var $mTplExpandCache; // empty-frame expansion cache
 104         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 105         var $mExpensiveFunctionCount; // number of expensive parser function calls
 106
 107         # Temporary
 108         # These are variables reset at least once per parse regardless of $clearState
 109         var $mOptions,      // ParserOptions object
 110                 $mTitle,        // Title context, used for self-link rendering and similar things
 111                 $mOutputType,   // Output type, one of the OT_xxx constants
 112                 $ot,            // Shortcut alias, see setOutputType()
 113                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 114                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 115                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 116
 117         /**#@-*/
 118
 119         /**
 120          * Constructor
 121          *
 122          * @public
 123          */
 124         function __construct( $conf = array() ) {
 125                 $this->mConf = $conf;
 126                 $this->mTagHooks = array();
 127                 $this->mTransparentTagHooks = array();
 128                 $this->mFunctionHooks = array();
 129                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 130                 $this->mDefaultStripList = $this->mStripList = array( 'nowiki', 'gallery' );
 131                 $this->mUrlProtocols = wfUrlProtocols();
 132                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 133                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 134                 $this->mVarCache = array();
 135                 if ( isset( $conf['preprocessorClass'] ) ) {
 136                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 137                 } elseif ( extension_loaded( 'domxml' ) ) {
 138                         // PECL extension that conflicts with the core DOM extension (bug 13770)
 139                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 140                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 141                 } elseif ( extension_loaded( 'dom' ) ) {
 142                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 143                 } else {
 144                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 145                 }
 146                 $this->mMarkerIndex = 0;
 147                 $this->mFirstCall = true;
 148         }
 149
 150         /**
 151          * Reduce memory usage to reduce the impact of circular references
 152          */
 153         function __destruct() {
 154                 if ( isset( $this->mLinkHolders ) ) {
 155                         $this->mLinkHolders->__destruct();
 156                 }
 157                 foreach ( $this as $name => $value ) {
 158                         unset( $this->$name );
 159                 }
 160         }
 161
 162         /**
 163          * Do various kinds of initialisation on the first call of the parser
 164          */
 165         function firstCallInit() {
 166                 if ( !$this->mFirstCall ) {
 167                         return;
 168                 }
 169                 $this->mFirstCall = false;
 170
 171                 wfProfileIn( __METHOD__ );
 172
 173                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 174                 CoreParserFunctions::register( $this );
 175                 $this->initialiseVariables();
 176
 177                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 178                 wfProfileOut( __METHOD__ );
 179         }
 180
 181         /**
 182          * Clear Parser state
 183          *
 184          * @private
 185          */
 186         function clearState() {
 187                 wfProfileIn( __METHOD__ );
 188                 if ( $this->mFirstCall ) {
 189                         $this->firstCallInit();
 190                 }
 191                 $this->mOutput = new ParserOutput;
 192                 $this->mAutonumber = 0;
 193                 $this->mLastSection = '';
 194                 $this->mDTopen = false;
 195                 $this->mIncludeCount = array();
 196                 $this->mStripState = new StripState;
 197                 $this->mArgStack = false;
 198                 $this->mInPre = false;
 199                 $this->mLinkHolders = new LinkHolderArray( $this );
 200                 $this->mLinkID = 0;
 201                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 202
 203                 /**
 204                  * Prefix for temporary replacement strings for the multipass parser.
 205                  * \x07 should never appear in input as it's disallowed in XML.
 206                  * Using it at the front also gives us a little extra robustness
 207                  * since it shouldn't match when butted up against identifier-like
 208                  * string constructs.
 209                  *
 210                  * Must not consist of all title characters, or else it will change
 211                  * the behaviour of <nowiki> in a link.
 212                  */
 213                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 214                 # Changed to \x7f to allow XML double-parsing -- TS
 215                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 216
 217
 218                 # Clear these on every parse, bug 4549
 219                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 220
 221                 $this->mShowToc = true;
 222                 $this->mForceTocPosition = false;
 223                 $this->mIncludeSizes = array(
 224                         'post-expand' => 0,
 225                         'arg' => 0,
 226                 );
 227                 $this->mPPNodeCount = 0;
 228                 $this->mDefaultSort = false;
 229                 $this->mHeadings = array();
 230                 $this->mDoubleUnderscores = array();
 231                 $this->mExpensiveFunctionCount = 0;
 232
 233                 # Fix cloning
 234                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 235                         $this->mPreprocessor = null;
 236                 }
 237
 238                 wfRunHooks( 'ParserClearState', array( &$this ) );
 239                 wfProfileOut( __METHOD__ );
 240         }
 241
 242         function setOutputType( $ot ) {
 243                 $this->mOutputType = $ot;
 244                 // Shortcut alias
 245                 $this->ot = array(
 246                         'html' => $ot == self::OT_HTML,
 247                         'wiki' => $ot == self::OT_WIKI,
 248                         'pre' => $ot == self::OT_PREPROCESS,
 249                 );
 250         }
 251
 252         /**
 253          * Set the context title
 254          */
 255         function setTitle( $t ) {
 256                 if ( !$t || $t instanceof FakeTitle ) {
 257                         $t = Title::newFromText( 'NO TITLE' );
 258                 }
 259                 if ( strval( $t->getFragment() ) !== '' ) {
 260                         # Strip the fragment to avoid various odd effects
 261                         $this->mTitle = clone $t;
 262                         $this->mTitle->setFragment( '' );
 263                 } else {
 264                         $this->mTitle = $t;
 265                 }
 266         }
 267
 268         /**
 269          * Accessor for mUniqPrefix.
 270          *
 271          * @public
 272          */
 273         function uniqPrefix() {
 274                 if( !isset( $this->mUniqPrefix ) ) {
 275                         // @fixme this is probably *horribly wrong*
 276                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 277                         // if this is called for a parser cache hit, the parser may not
 278                         // have ever been initialized in the first place.
 279                         // Not really sure what the heck is supposed to be going on here.
 280                         return '';
 281                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 282                 }
 283                 return $this->mUniqPrefix;
 284         }
 285
 286         /**
 287          * Convert wikitext to HTML
 288          * Do not call this function recursively.
 289          *
 290          * @param $text String: text we want to parse
 291          * @param $title A title object
 292          * @param $options ParserOptions
 293          * @param $linestart boolean
 294          * @param $clearState boolean
 295          * @param $revid Int: number to pass in {{REVISIONID}}
 296          * @return ParserOutput a ParserOutput
 297          */
 298         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 299                 /**
 300                  * First pass--just handle <nowiki> sections, pass the rest off
 301                  * to internalParse() which does all the real work.
 302                  */
 303
 304                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 305                 $fname = __METHOD__.'-' . wfGetCaller();
 306                 wfProfileIn( __METHOD__ );
 307                 wfProfileIn( $fname );
 308
 309                 if ( $clearState ) {
 310                         $this->clearState();
 311                 }
 312
 313                 $this->mOptions = $options;
 314                 $this->setTitle( $title );
 315                 $oldRevisionId = $this->mRevisionId;
 316                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 317                 if( $revid !== null ) {
 318                         $this->mRevisionId = $revid;
 319                         $this->mRevisionTimestamp = null;
 320                 }
 321                 $this->setOutputType( self::OT_HTML );
 322                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 323                 # No more strip!
 324                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 325                 $text = $this->internalParse( $text );
 326                 $text = $this->mStripState->unstripGeneral( $text );
 327
 328                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 329                 $fixtags = array(
 330                         # french spaces, last one Guillemet-left
 331                         # only if there is something before the space
 332                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 333                         # french spaces, Guillemet-right
 334                         '/(\\302\\253) /' => '\\1&nbsp;',
 335                         '/&nbsp;(!\s*important)/' => ' \\1', #Beware of CSS magic word !important, bug #11874.
 336                 );
 337                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 338
 339                 $text = $this->doBlockLevels( $text, $linestart );
 340
 341                 $this->replaceLinkHolders( $text );
 342
 343                 # the position of the parserConvert() call should not be changed. it
 344                 # assumes that the links are all replaced and the only thing left
 345                 # is the <nowiki> mark.
 346                 # Side-effects: this calls $this->mOutput->setTitleText()
 347                 $text = $wgContLang->parserConvert( $text, $this );
 348
 349                 $text = $this->mStripState->unstripNoWiki( $text );
 350
 351                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 352
 353 //!JF Move to its own function
 354
 355                 $uniq_prefix = $this->mUniqPrefix;
 356                 $matches = array();
 357                 $elements = array_keys( $this->mTransparentTagHooks );
 358                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 359
 360                 foreach( $matches as $marker => $data ) {
 361                         list( $element, $content, $params, $tag ) = $data;
 362                         $tagName = strtolower( $element );
 363                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 364                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 365                                         array( $content, $params, $this ) );
 366                         } else {
 367                                 $output = $tag;
 368                         }
 369                         $this->mStripState->general->setPair( $marker, $output );
 370                 }
 371                 $text = $this->mStripState->unstripGeneral( $text );
 372
 373                 $text = Sanitizer::normalizeCharReferences( $text );
 374
 375                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 376                         $text = self::tidy($text);
 377                 } else {
 378                         # attempt to sanitize at least some nesting problems
 379                         # (bug #2702 and quite a few others)
 380                         $tidyregs = array(
 381                                 # ''Something [http://www.cool.com cool''] -->
 382                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 383                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 384                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 385                                 # fix up an anchor inside another anchor, only
 386                                 # at least for a single single nested link (bug 3695)
 387                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 388                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 389                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 390                                 # contains a div, so fix it up here; replace
 391                                 # div with escaped text
 392                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 393                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 394                                 # remove empty italic or bold tag pairs, some
 395                                 # introduced by rules above
 396                                 '/<([bi])><\/\\1>/' => '',
 397                         );
 398
 399                         $text = preg_replace(
 400                                 array_keys( $tidyregs ),
 401                                 array_values( $tidyregs ),
 402                                 $text );
 403                 }
 404                 global $wgExpensiveParserFunctionLimit;
 405                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 406                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 407                 }
 408
 409                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 410
 411                 # Information on include size limits, for the benefit of users who try to skirt them
 412                 if ( $this->mOptions->getEnableLimitReport() ) {
 413                         global $wgExpensiveParserFunctionLimit;
 414                         $max = $this->mOptions->getMaxIncludeSize();
 415                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 416                         $limitReport =
 417                                 "NewPP limit report\n" .
 418                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 419                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 420                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 421                                 $PFreport;
 422                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 423                         $text .= "\n<!-- \n$limitReport-->\n";
 424                 }
 425                 $this->mOutput->setText( $text );
 426                 $this->mRevisionId = $oldRevisionId;
 427                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 428                 wfProfileOut( $fname );
 429                 wfProfileOut( __METHOD__ );
 430
 431                 return $this->mOutput;
 432         }
 433
 434         /**
 435          * Recursive parser entry point that can be called from an extension tag
 436          * hook.
 437          */
 438         function recursiveTagParse( $text ) {
 439                 wfProfileIn( __METHOD__ );
 440                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 441                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 442                 $text = $this->internalParse( $text );
 443                 wfProfileOut( __METHOD__ );
 444                 return $text;
 445         }
 446
 447         /**
 448          * Expand templates and variables in the text, producing valid, static wikitext.
 449          * Also removes comments.
 450          */
 451         function preprocess( $text, $title, $options, $revid = null ) {
 452                 wfProfileIn( __METHOD__ );
 453                 $this->clearState();
 454                 $this->setOutputType( self::OT_PREPROCESS );
 455                 $this->mOptions = $options;
 456                 $this->setTitle( $title );
 457                 if( $revid !== null ) {
 458                         $this->mRevisionId = $revid;
 459                 }
 460                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 461                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 462                 $text = $this->replaceVariables( $text );
 463                 $text = $this->mStripState->unstripBoth( $text );
 464                 wfProfileOut( __METHOD__ );
 465                 return $text;
 466         }
 467
 468         /**
 469          * Get a random string
 470          *
 471          * @private
 472          * @static
 473          */
 474         function getRandomString() {
 475                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 476         }
 477
 478         function &getTitle() { return $this->mTitle; }
 479         function getOptions() { return $this->mOptions; }
 480         function getRevisionId() { return $this->mRevisionId; }
 481         function getOutput() { return $this->mOutput; }
 482         function nextLinkID() { return $this->mLinkID++; }
 483
 484         function getFunctionLang() {
 485                 global $wgLang, $wgContLang;
 486
 487                 $target = $this->mOptions->getTargetLanguage();
 488                 if ( $target !== null ) {
 489                         return $target;
 490                 } else {
 491                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 492                 }
 493         }
 494
 495         /**
 496          * Get a preprocessor object
 497          */
 498         function getPreprocessor() {
 499                 if ( !isset( $this->mPreprocessor ) ) {
 500                         $class = $this->mPreprocessorClass;
 501                         $this->mPreprocessor = new $class( $this );
 502                 }
 503                 return $this->mPreprocessor;
 504         }
 505
 506         /**
 507          * Replaces all occurrences of HTML-style comments and the given tags
 508          * in the text with a random marker and returns the next text. The output
 509          * parameter $matches will be an associative array filled with data in
 510          * the form:
 511          *   'UNIQ-xxxxx' => array(
 512          *     'element',
 513          *     'tag content',
 514          *     array( 'param' => 'x' ),
 515          *     '<element param="x">tag content</element>' ) )
 516          *
 517          * @param $elements list of element names. Comments are always extracted.
 518          * @param $text Source text string.
 519          * @param $uniq_prefix
 520          *
 521          * @public
 522          * @static
 523          */
 524         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 525                 static $n = 1;
 526                 $stripped = '';
 527                 $matches = array();
 528
 529                 $taglist = implode( '|', $elements );
 530                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 531
 532                 while ( '' != $text ) {
 533                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 534                         $stripped .= $p[0];
 535                         if( count( $p ) < 5 ) {
 536                                 break;
 537                         }
 538                         if( count( $p ) > 5 ) {
 539                                 // comment
 540                                 $element    = $p[4];
 541                                 $attributes = '';
 542                                 $close      = '';
 543                                 $inside     = $p[5];
 544                         } else {
 545                                 // tag
 546                                 $element    = $p[1];
 547                                 $attributes = $p[2];
 548                                 $close      = $p[3];
 549                                 $inside     = $p[4];
 550                         }
 551
 552                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . self::MARKER_SUFFIX;
 553                         $stripped .= $marker;
 554
 555                         if ( $close === '/>' ) {
 556                                 // Empty element tag, <tag />
 557                                 $content = null;
 558                                 $text = $inside;
 559                                 $tail = null;
 560                         } else {
 561                                 if( $element === '!--' ) {
 562                                         $end = '/(-->)/';
 563                                 } else {
 564                                         $end = "/(<\\/$element\\s*>)/i";
 565                                 }
 566                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 567                                 $content = $q[0];
 568                                 if( count( $q ) < 3 ) {
 569                                         # No end tag -- let it run out to the end of the text.
 570                                         $tail = '';
 571                                         $text = '';
 572                                 } else {
 573                                         $tail = $q[1];
 574                                         $text = $q[2];
 575                                 }
 576                         }
 577
 578                         $matches[$marker] = array( $element,
 579                                 $content,
 580                                 Sanitizer::decodeTagAttributes( $attributes ),
 581                                 "<$element$attributes$close$content$tail" );
 582                 }
 583                 return $stripped;
 584         }
 585
 586         /**
 587          * Get a list of strippable XML-like elements
 588          */
 589         function getStripList() {
 590                 global $wgRawHtml;
 591                 $elements = $this->mStripList;
 592                 if( $wgRawHtml ) {
 593                         $elements[] = 'html';
 594                 }
 595                 if( $this->mOptions->getUseTeX() ) {
 596                         $elements[] = 'math';
 597                 }
 598                 return $elements;
 599         }
 600
 601         /**
 602          * @deprecated use replaceVariables
 603          */
 604         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 605                 return $text;
 606         }
 607
 608         /**
 609          * Restores pre, math, and other extensions removed by strip()
 610          *
 611          * always call unstripNoWiki() after this one
 612          * @private
 613          * @deprecated use $this->mStripState->unstrip()
 614          */
 615         function unstrip( $text, $state ) {
 616                 return $state->unstripGeneral( $text );
 617         }
 618
 619         /**
 620          * Always call this after unstrip() to preserve the order
 621          *
 622          * @private
 623          * @deprecated use $this->mStripState->unstrip()
 624          */
 625         function unstripNoWiki( $text, $state ) {
 626                 return $state->unstripNoWiki( $text );
 627         }
 628
 629         /**
 630          * @deprecated use $this->mStripState->unstripBoth()
 631          */
 632         function unstripForHTML( $text ) {
 633                 return $this->mStripState->unstripBoth( $text );
 634         }
 635
 636         /**
 637          * Add an item to the strip state
 638          * Returns the unique tag which must be inserted into the stripped text
 639          * The tag will be replaced with the original text in unstrip()
 640          *
 641          * @private
 642          */
 643         function insertStripItem( $text ) {
 644                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 645                 $this->mMarkerIndex++;
 646                 $this->mStripState->general->setPair( $rnd, $text );
 647                 return $rnd;
 648         }
 649
 650         /**
 651          * Interface with html tidy, used if $wgUseTidy = true.
 652          * If tidy isn't able to correct the markup, the original will be
 653          * returned in all its glory with a warning comment appended.
 654          *
 655          * Either the external tidy program or the in-process tidy extension
 656          * will be used depending on availability. Override the default
 657          * $wgTidyInternal setting to disable the internal if it's not working.
 658          *
 659          * @param string $text Hideous HTML input
 660          * @return string Corrected HTML output
 661          * @public
 662          * @static
 663          */
 664         function tidy( $text ) {
 665                 global $wgTidyInternal;
 666                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 667 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 668 '<head><title>test</title></head><body>'.$text.'</body></html>';
 669                 if( $wgTidyInternal ) {
 670                         $correctedtext = self::internalTidy( $wrappedtext );
 671                 } else {
 672                         $correctedtext = self::externalTidy( $wrappedtext );
 673                 }
 674                 if( is_null( $correctedtext ) ) {
 675                         wfDebug( "Tidy error detected!\n" );
 676                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 677                 }
 678                 return $correctedtext;
 679         }
 680
 681         /**
 682          * Spawn an external HTML tidy process and get corrected markup back from it.
 683          *
 684          * @private
 685          * @static
 686          */
 687         function externalTidy( $text ) {
 688                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 689                 wfProfileIn( __METHOD__ );
 690
 691                 $cleansource = '';
 692                 $opts = ' -utf8';
 693
 694                 $descriptorspec = array(
 695                         0 => array('pipe', 'r'),
 696                         1 => array('pipe', 'w'),
 697                         2 => array('file', wfGetNull(), 'a')
 698                 );
 699                 $pipes = array();
 700                 if( function_exists('proc_open') ) {
 701                         $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 702                         if (is_resource($process)) {
 703                                 // Theoretically, this style of communication could cause a deadlock
 704                                 // here. If the stdout buffer fills up, then writes to stdin could
 705                                 // block. This doesn't appear to happen with tidy, because tidy only
 706                                 // writes to stdout after it's finished reading from stdin. Search
 707                                 // for tidyParseStdin and tidySaveStdout in console/tidy.c
 708                                 fwrite($pipes[0], $text);
 709                                 fclose($pipes[0]);
 710                                 while (!feof($pipes[1])) {
 711                                         $cleansource .= fgets($pipes[1], 1024);
 712                                 }
 713                                 fclose($pipes[1]);
 714                                 proc_close($process);
 715                         }
 716                 }
 717
 718                 wfProfileOut( __METHOD__ );
 719
 720                 if( $cleansource == '' && $text != '') {
 721                         // Some kind of error happened, so we couldn't get the corrected text.
 722                         // Just give up; we'll use the source text and append a warning.
 723                         return null;
 724                 } else {
 725                         return $cleansource;
 726                 }
 727         }
 728
 729         /**
 730          * Use the HTML tidy PECL extension to use the tidy library in-process,
 731          * saving the overhead of spawning a new process.
 732          *
 733          * 'pear install tidy' should be able to compile the extension module.
 734          *
 735          * @private
 736          * @static
 737          */
 738         function internalTidy( $text ) {
 739                 global $wgTidyConf, $IP, $wgDebugTidy;
 740                 wfProfileIn( __METHOD__ );
 741
 742                 $tidy = new tidy;
 743                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 744                 $tidy->cleanRepair();
 745                 if( $tidy->getStatus() == 2 ) {
 746                         // 2 is magic number for fatal error
 747                         // http://www.php.net/manual/en/function.tidy-get-status.php
 748                         $cleansource = null;
 749                 } else {
 750                         $cleansource = tidy_get_output( $tidy );
 751                 }
 752                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 753                         $cleansource .= "<!--\nTidy reports:\n" .
 754                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 755                                 "\n-->";
 756                 }
 757
 758                 wfProfileOut( __METHOD__ );
 759                 return $cleansource;
 760         }
 761
 762         /**
 763          * parse the wiki syntax used to render tables
 764          *
 765          * @private
 766          */
 767         function doTableStuff ( $text ) {
 768                 wfProfileIn( __METHOD__ );
 769
 770                 $lines = StringUtils::explode( "\n", $text );
 771                 $out = '';
 772                 $td_history = array (); // Is currently a td tag open?
 773                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 774                 $tr_history = array (); // Is currently a tr tag open?
 775                 $tr_attributes = array (); // history of tr attributes
 776                 $has_opened_tr = array(); // Did this table open a <tr> element?
 777                 $indent_level = 0; // indent level of the table
 778
 779                 foreach ( $lines as $outLine ) {
 780                         $line = trim( $outLine );
 781
 782                         if( $line == '' ) { // empty line, go to next line
 783                                 $out .= $outLine."\n";
 784                                 continue;
 785                         }
 786                         $first_character = $line[0];
 787                         $matches = array();
 788
 789                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 790                                 // First check if we are starting a new table
 791                                 $indent_level = strlen( $matches[1] );
 792
 793                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 794                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 795
 796                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 797                                 array_push ( $td_history , false );
 798                                 array_push ( $last_tag_history , '' );
 799                                 array_push ( $tr_history , false );
 800                                 array_push ( $tr_attributes , '' );
 801                                 array_push ( $has_opened_tr , false );
 802                         } else if ( count ( $td_history ) == 0 ) {
 803                                 // Don't do any of the following
 804                                 $out .= $outLine."\n";
 805                                 continue;
 806                         } else if ( substr ( $line , 0 , 2 ) === '|}' ) {
 807                                 // We are ending a table
 808                                 $line = '</table>' . substr ( $line , 2 );
 809                                 $last_tag = array_pop ( $last_tag_history );
 810
 811                                 if ( !array_pop ( $has_opened_tr ) ) {
 812                                         $line = "<tr><td></td></tr>{$line}";
 813                                 }
 814
 815                                 if ( array_pop ( $tr_history ) ) {
 816                                         $line = "</tr>{$line}";
 817                                 }
 818
 819                                 if ( array_pop ( $td_history ) ) {
 820                                         $line = "</{$last_tag}>{$line}";
 821                                 }
 822                                 array_pop ( $tr_attributes );
 823                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 824                         } else if ( substr ( $line , 0 , 2 ) === '|-' ) {
 825                                 // Now we have a table row
 826                                 $line = preg_replace( '#^\|-+#', '', $line );
 827
 828                                 // Whats after the tag is now only attributes
 829                                 $attributes = $this->mStripState->unstripBoth( $line );
 830                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 831                                 array_pop ( $tr_attributes );
 832                                 array_push ( $tr_attributes , $attributes );
 833
 834                                 $line = '';
 835                                 $last_tag = array_pop ( $last_tag_history );
 836                                 array_pop ( $has_opened_tr );
 837                                 array_push ( $has_opened_tr , true );
 838
 839                                 if ( array_pop ( $tr_history ) ) {
 840                                         $line = '</tr>';
 841                                 }
 842
 843                                 if ( array_pop ( $td_history ) ) {
 844                                         $line = "</{$last_tag}>{$line}";
 845                                 }
 846
 847                                 $outLine = $line;
 848                                 array_push ( $tr_history , false );
 849                                 array_push ( $td_history , false );
 850                                 array_push ( $last_tag_history , '' );
 851                         }
 852                         else if ( $first_character === '|' || $first_character === '!' || substr ( $line , 0 , 2 )  === '|+' ) {
 853                                 // This might be cell elements, td, th or captions
 854                                 if ( substr ( $line , 0 , 2 ) === '|+' ) {
 855                                         $first_character = '+';
 856                                         $line = substr ( $line , 1 );
 857                                 }
 858
 859                                 $line = substr ( $line , 1 );
 860
 861                                 if ( $first_character === '!' ) {
 862                                         $line = str_replace ( '!!' , '||' , $line );
 863                                 }
 864
 865                                 // Split up multiple cells on the same line.
 866                                 // FIXME : This can result in improper nesting of tags processed
 867                                 // by earlier parser steps, but should avoid splitting up eg
 868                                 // attribute values containing literal "||".
 869                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 870
 871                                 $outLine = '';
 872
 873                                 // Loop through each table cell
 874                                 foreach ( $cells as $cell )
 875                                 {
 876                                         $previous = '';
 877                                         if ( $first_character !== '+' )
 878                                         {
 879                                                 $tr_after = array_pop ( $tr_attributes );
 880                                                 if ( !array_pop ( $tr_history ) ) {
 881                                                         $previous = "<tr{$tr_after}>\n";
 882                                                 }
 883                                                 array_push ( $tr_history , true );
 884                                                 array_push ( $tr_attributes , '' );
 885                                                 array_pop ( $has_opened_tr );
 886                                                 array_push ( $has_opened_tr , true );
 887                                         }
 888
 889                                         $last_tag = array_pop ( $last_tag_history );
 890
 891                                         if ( array_pop ( $td_history ) ) {
 892                                                 $previous = "</{$last_tag}>{$previous}";
 893                                         }
 894
 895                                         if ( $first_character === '|' ) {
 896                                                 $last_tag = 'td';
 897                                         } else if ( $first_character === '!' ) {
 898                                                 $last_tag = 'th';
 899                                         } else if ( $first_character === '+' ) {
 900                                                 $last_tag = 'caption';
 901                                         } else {
 902                                                 $last_tag = '';
 903                                         }
 904
 905                                         array_push ( $last_tag_history , $last_tag );
 906
 907                                         // A cell could contain both parameters and data
 908                                         $cell_data = explode ( '|' , $cell , 2 );
 909
 910                                         // Bug 553: Note that a '|' inside an invalid link should not
 911                                         // be mistaken as delimiting cell parameters
 912                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 913                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 914                                         } else if ( count ( $cell_data ) == 1 )
 915                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 916                                         else {
 917                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 918                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 919                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 920                                         }
 921
 922                                         $outLine .= $cell;
 923                                         array_push ( $td_history , true );
 924                                 }
 925                         }
 926                         $out .= $outLine . "\n";
 927                 }
 928
 929                 // Closing open td, tr && table
 930                 while ( count ( $td_history ) > 0 )
 931                 {
 932                         if ( array_pop ( $td_history ) ) {
 933                                 $out .= "</td>\n";
 934                         }
 935                         if ( array_pop ( $tr_history ) ) {
 936                                 $out .= "</tr>\n";
 937                         }
 938                         if ( !array_pop ( $has_opened_tr ) ) {
 939                                 $out .= "<tr><td></td></tr>\n" ;
 940                         }
 941
 942                         $out .= "</table>\n";
 943                 }
 944
 945                 // Remove trailing line-ending (b/c)
 946                 if ( substr( $out, -1 ) === "\n" ) {
 947                         $out = substr( $out, 0, -1 );
 948                 }
 949
 950                 // special case: don't return empty table
 951                 if( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 952                         $out = '';
 953                 }
 954
 955                 wfProfileOut( __METHOD__ );
 956
 957                 return $out;
 958         }
 959
 960         /**
 961          * Helper function for parse() that transforms wiki markup into
 962          * HTML. Only called for $mOutputType == self::OT_HTML.
 963          *
 964          * @private
 965          */
 966         function internalParse( $text ) {
 967                 $isMain = true;
 968                 wfProfileIn( __METHOD__ );
 969
 970                 # Hook to suspend the parser in this state
 971                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 972                         wfProfileOut( __METHOD__ );
 973                         return $text ;
 974                 }
 975
 976                 $text = $this->replaceVariables( $text );
 977                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 978                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 979
 980                 // Tables need to come after variable replacement for things to work
 981                 // properly; putting them before other transformations should keep
 982                 // exciting things like link expansions from showing up in surprising
 983                 // places.
 984                 $text = $this->doTableStuff( $text );
 985
 986                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 987
 988                 $text = $this->doDoubleUnderscore( $text );
 989                 $text = $this->doHeadings( $text );
 990                 if($this->mOptions->getUseDynamicDates()) {
 991                         $df = DateFormatter::getInstance();
 992                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 993                 }
 994                 $text = $this->doAllQuotes( $text );
 995                 $text = $this->replaceInternalLinks( $text );
 996                 $text = $this->replaceExternalLinks( $text );
 997
 998                 # replaceInternalLinks may sometimes leave behind
 999                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1000                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1001
1002                 $text = $this->doMagicLinks( $text );
1003                 $text = $this->formatHeadings( $text, $isMain );
1004
1005                 wfProfileOut( __METHOD__ );
1006                 return $text;
1007         }
1008
1009         /**
1010          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1011          * magic external links.
1012          *
1013          * DML
1014          * @private
1015          */
1016         function doMagicLinks( $text ) {
1017                 wfProfileIn( __METHOD__ );
1018                 $prots = $this->mUrlProtocols;
1019                 $urlChar = self::EXT_LINK_URL_CLASS;
1020                 $text = preg_replace_callback(
1021                         '!(?:                           # Start cases
1022                                 (<a.*?</a>) |               # m[1]: Skip link text
1023                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
1024                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
1025                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
1026                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
1027                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1028                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1029                                     [0-9Xx]                 # check digit
1030                                     \b)
1031                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1032                 wfProfileOut( __METHOD__ );
1033                 return $text;
1034         }
1035
1036         function magicLinkCallback( $m ) {
1037                 if ( isset( $m[1] ) && strval( $m[1] ) !== '' ) {
1038                         # Skip anchor
1039                         return $m[0];
1040                 } elseif ( isset( $m[2] ) && strval( $m[2] ) !== '' ) {
1041                         # Skip HTML element
1042                         return $m[0];
1043                 } elseif ( isset( $m[3] ) && strval( $m[3] ) !== '' ) {
1044                         # Free external link
1045                         return $this->makeFreeExternalLink( $m[0] );
1046                 } elseif ( isset( $m[4] ) && strval( $m[4] ) !== '' ) {
1047                         # RFC or PMID
1048                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1049                                 $keyword = 'RFC';
1050                                 $urlmsg = 'rfcurl';
1051                                 $id = $m[4];
1052                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1053                                 $keyword = 'PMID';
1054                                 $urlmsg = 'pubmedurl';
1055                                 $id = $m[4];
1056                         } else {
1057                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1058                                         substr($m[0], 0, 20 ) . '"' );
1059                         }
1060                         $url = wfMsg( $urlmsg, $id);
1061                         $sk = $this->mOptions->getSkin();
1062                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1063                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1064                 } elseif ( isset( $m[5] ) && strval( $m[5] ) !== '' ) {
1065                         # ISBN
1066                         $isbn = $m[5];
1067                         $num = strtr( $isbn, array(
1068                                 '-' => '',
1069                                 ' ' => '',
1070                                 'x' => 'X',
1071                         ));
1072                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1073                         return'<a href="' .
1074                                 $titleObj->escapeLocalUrl() .
1075                                 "\" class=\"internal\">ISBN $isbn</a>";
1076                 } else {
1077                         return $m[0];
1078                 }
1079         }
1080
1081         /**
1082          * Make a free external link, given a user-supplied URL
1083          * @return HTML
1084          * @private
1085          */
1086         function makeFreeExternalLink( $url ) {
1087                 global $wgContLang;
1088                 wfProfileIn( __METHOD__ );
1089
1090                 $sk = $this->mOptions->getSkin();
1091                 $trail = '';
1092
1093                 # The characters '<' and '>' (which were escaped by
1094                 # removeHTMLtags()) should not be included in
1095                 # URLs, per RFC 2396.
1096                 $m2 = array();
1097                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1098                         $trail = substr($url, $m2[0][1]) . $trail;
1099                         $url = substr($url, 0, $m2[0][1]);
1100                 }
1101
1102                 # Move trailing punctuation to $trail
1103                 $sep = ',;\.:!?';
1104                 # If there is no left bracket, then consider right brackets fair game too
1105                 if ( strpos( $url, '(' ) === false ) {
1106                         $sep .= ')';
1107                 }
1108
1109                 $numSepChars = strspn( strrev( $url ), $sep );
1110                 if ( $numSepChars ) {
1111                         $trail = substr( $url, -$numSepChars ) . $trail;
1112                         $url = substr( $url, 0, -$numSepChars );
1113                 }
1114
1115                 $url = Sanitizer::cleanUrl( $url );
1116
1117                 # Is this an external image?
1118                 $text = $this->maybeMakeExternalImage( $url );
1119                 if ( $text === false ) {
1120                         # Not an image, make a link
1121                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1122                                 $this->getExternalLinkAttribs() );
1123                         # Register it in the output object...
1124                         # Replace unnecessary URL escape codes with their equivalent characters
1125                         $pasteurized = self::replaceUnusualEscapes( $url );
1126                         $this->mOutput->addExternalLink( $pasteurized );
1127                 }
1128                 wfProfileOut( __METHOD__ );
1129                 return $text . $trail;
1130         }
1131
1132
1133         /**
1134          * Parse headers and return html
1135          *
1136          * @private
1137          */
1138         function doHeadings( $text ) {
1139                 wfProfileIn( __METHOD__ );
1140                 for ( $i = 6; $i >= 1; --$i ) {
1141                         $h = str_repeat( '=', $i );
1142                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1143                           "<h$i>\\1</h$i>", $text );
1144                 }
1145                 wfProfileOut( __METHOD__ );
1146                 return $text;
1147         }
1148
1149         /**
1150          * Replace single quotes with HTML markup
1151          * @private
1152          * @return string the altered text
1153          */
1154         function doAllQuotes( $text ) {
1155                 wfProfileIn( __METHOD__ );
1156                 $outtext = '';
1157                 $lines = StringUtils::explode( "\n", $text );
1158                 foreach ( $lines as $line ) {
1159                         $outtext .= $this->doQuotes( $line ) . "\n";
1160                 }
1161                 $outtext = substr($outtext, 0,-1);
1162                 wfProfileOut( __METHOD__ );
1163                 return $outtext;
1164         }
1165
1166         /**
1167          * Helper function for doAllQuotes()
1168          */
1169         public function doQuotes( $text ) {
1170                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1171                 if ( count( $arr ) == 1 )
1172                         return $text;
1173                 else
1174                 {
1175                         # First, do some preliminary work. This may shift some apostrophes from
1176                         # being mark-up to being text. It also counts the number of occurrences
1177                         # of bold and italics mark-ups.
1178                         $i = 0;
1179                         $numbold = 0;
1180                         $numitalics = 0;
1181                         foreach ( $arr as $r )
1182                         {
1183                                 if ( ( $i % 2 ) == 1 )
1184                                 {
1185                                         # If there are ever four apostrophes, assume the first is supposed to
1186                                         # be text, and the remaining three constitute mark-up for bold text.
1187                                         if ( strlen( $arr[$i] ) == 4 )
1188                                         {
1189                                                 $arr[$i-1] .= "'";
1190                                                 $arr[$i] = "'''";
1191                                         }
1192                                         # If there are more than 5 apostrophes in a row, assume they're all
1193                                         # text except for the last 5.
1194                                         else if ( strlen( $arr[$i] ) > 5 )
1195                                         {
1196                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1197                                                 $arr[$i] = "'''''";
1198                                         }
1199                                         # Count the number of occurrences of bold and italics mark-ups.
1200                                         # We are not counting sequences of five apostrophes.
1201                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1202                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1203                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1204                                 }
1205                                 $i++;
1206                         }
1207
1208                         # If there is an odd number of both bold and italics, it is likely
1209                         # that one of the bold ones was meant to be an apostrophe followed
1210                         # by italics. Which one we cannot know for certain, but it is more
1211                         # likely to be one that has a single-letter word before it.
1212                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1213                         {
1214                                 $i = 0;
1215                                 $firstsingleletterword = -1;
1216                                 $firstmultiletterword = -1;
1217                                 $firstspace = -1;
1218                                 foreach ( $arr as $r )
1219                                 {
1220                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1221                                         {
1222                                                 $x1 = substr ($arr[$i-1], -1);
1223                                                 $x2 = substr ($arr[$i-1], -2, 1);
1224                                                 if ($x1 === ' ') {
1225                                                         if ($firstspace == -1) $firstspace = $i;
1226                                                 } else if ($x2 === ' ') {
1227                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1228                                                 } else {
1229                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1230                                                 }
1231                                         }
1232                                         $i++;
1233                                 }
1234
1235                                 # If there is a single-letter word, use it!
1236                                 if ($firstsingleletterword > -1)
1237                                 {
1238                                         $arr [ $firstsingleletterword ] = "''";
1239                                         $arr [ $firstsingleletterword-1 ] .= "'";
1240                                 }
1241                                 # If not, but there's a multi-letter word, use that one.
1242                                 else if ($firstmultiletterword > -1)
1243                                 {
1244                                         $arr [ $firstmultiletterword ] = "''";
1245                                         $arr [ $firstmultiletterword-1 ] .= "'";
1246                                 }
1247                                 # ... otherwise use the first one that has neither.
1248                                 # (notice that it is possible for all three to be -1 if, for example,
1249                                 # there is only one pentuple-apostrophe in the line)
1250                                 else if ($firstspace > -1)
1251                                 {
1252                                         $arr [ $firstspace ] = "''";
1253                                         $arr [ $firstspace-1 ] .= "'";
1254                                 }
1255                         }
1256
1257                         # Now let's actually convert our apostrophic mush to HTML!
1258                         $output = '';
1259                         $buffer = '';
1260                         $state = '';
1261                         $i = 0;
1262                         foreach ($arr as $r)
1263                         {
1264                                 if (($i % 2) == 0)
1265                                 {
1266                                         if ($state === 'both')
1267                                                 $buffer .= $r;
1268                                         else
1269                                                 $output .= $r;
1270                                 }
1271                                 else
1272                                 {
1273                                         if (strlen ($r) == 2)
1274                                         {
1275                                                 if ($state === 'i')
1276                                                 { $output .= '</i>'; $state = ''; }
1277                                                 else if ($state === 'bi')
1278                                                 { $output .= '</i>'; $state = 'b'; }
1279                                                 else if ($state === 'ib')
1280                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1281                                                 else if ($state === 'both')
1282                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1283                                                 else # $state can be 'b' or ''
1284                                                 { $output .= '<i>'; $state .= 'i'; }
1285                                         }
1286                                         else if (strlen ($r) == 3)
1287                                         {
1288                                                 if ($state === 'b')
1289                                                 { $output .= '</b>'; $state = ''; }
1290                                                 else if ($state === 'bi')
1291                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1292                                                 else if ($state === 'ib')
1293                                                 { $output .= '</b>'; $state = 'i'; }
1294                                                 else if ($state === 'both')
1295                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1296                                                 else # $state can be 'i' or ''
1297                                                 { $output .= '<b>'; $state .= 'b'; }
1298                                         }
1299                                         else if (strlen ($r) == 5)
1300                                         {
1301                                                 if ($state === 'b')
1302                                                 { $output .= '</b><i>'; $state = 'i'; }
1303                                                 else if ($state === 'i')
1304                                                 { $output .= '</i><b>'; $state = 'b'; }
1305                                                 else if ($state === 'bi')
1306                                                 { $output .= '</i></b>'; $state = ''; }
1307                                                 else if ($state === 'ib')
1308                                                 { $output .= '</b></i>'; $state = ''; }
1309                                                 else if ($state === 'both')
1310                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1311                                                 else # ($state == '')
1312                                                 { $buffer = ''; $state = 'both'; }
1313                                         }
1314                                 }
1315                                 $i++;
1316                         }
1317                         # Now close all remaining tags.  Notice that the order is important.
1318                         if ($state === 'b' || $state === 'ib')
1319                                 $output .= '</b>';
1320                         if ($state === 'i' || $state === 'bi' || $state === 'ib')
1321                                 $output .= '</i>';
1322                         if ($state === 'bi')
1323                                 $output .= '</b>';
1324                         # There might be lonely ''''', so make sure we have a buffer
1325                         if ($state === 'both' && $buffer)
1326                                 $output .= '<b><i>'.$buffer.'</i></b>';
1327                         return $output;
1328                 }
1329         }
1330
1331         /**
1332          * Replace external links (REL)
1333          *
1334          * Note: this is all very hackish and the order of execution matters a lot.
1335          * Make sure to run maintenance/parserTests.php if you change this code.
1336          *
1337          * @private
1338          */
1339         function replaceExternalLinks( $text ) {
1340                 global $wgContLang;
1341                 wfProfileIn( __METHOD__ );
1342
1343                 $sk = $this->mOptions->getSkin();
1344
1345                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1346                 $s = array_shift( $bits );
1347
1348                 $i = 0;
1349                 while ( $i<count( $bits ) ) {
1350                         $url = $bits[$i++];
1351                         $protocol = $bits[$i++];
1352                         $text = $bits[$i++];
1353                         $trail = $bits[$i++];
1354
1355                         # The characters '<' and '>' (which were escaped by
1356                         # removeHTMLtags()) should not be included in
1357                         # URLs, per RFC 2396.
1358                         $m2 = array();
1359                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1360                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1361                                 $url = substr($url, 0, $m2[0][1]);
1362                         }
1363
1364                         # If the link text is an image URL, replace it with an <img> tag
1365                         # This happened by accident in the original parser, but some people used it extensively
1366                         $img = $this->maybeMakeExternalImage( $text );
1367                         if ( $img !== false ) {
1368                                 $text = $img;
1369                         }
1370
1371                         $dtrail = '';
1372
1373                         # Set linktype for CSS - if URL==text, link is essentially free
1374                         $linktype = ($text === $url) ? 'free' : 'text';
1375
1376                         # No link text, e.g. [http://domain.tld/some.link]
1377                         if ( $text == '' ) {
1378                                 # Autonumber if allowed. See bug #5918
1379                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1380                                         $text = '[' . ++$this->mAutonumber . ']';
1381                                         $linktype = 'autonumber';
1382                                 } else {
1383                                         # Otherwise just use the URL
1384                                         $text = htmlspecialchars( $url );
1385                                         $linktype = 'free';
1386                                 }
1387                         } else {
1388                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1389                                 # Check for trail
1390                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1391                         }
1392
1393                         $text = $wgContLang->markNoConversion($text);
1394
1395                         $url = Sanitizer::cleanUrl( $url );
1396
1397                         if ( $this->mOptions->mExternalLinkTarget ) {
1398                                 $attribs = array( 'target' => $this->mOptions->mExternalLinkTarget );
1399                         } else {
1400                                 $attribs = array();
1401                         }
1402
1403                         # Use the encoded URL
1404                         # This means that users can paste URLs directly into the text
1405                         # Funny characters like &ouml; aren't valid in URLs anyway
1406                         # This was changed in August 2004
1407                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->getExternalLinkAttribs() )
1408                                 . $dtrail . $trail;
1409
1410                         # Register link in the output object.
1411                         # Replace unnecessary URL escape codes with the referenced character
1412                         # This prevents spammers from hiding links from the filters
1413                         $pasteurized = self::replaceUnusualEscapes( $url );
1414                         $this->mOutput->addExternalLink( $pasteurized );
1415                 }
1416
1417                 wfProfileOut( __METHOD__ );
1418                 return $s;
1419         }
1420
1421         function getExternalLinkAttribs() {
1422                 $attribs = array();
1423                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1424                 $ns = $this->mTitle->getNamespace();
1425                 if( $wgNoFollowLinks && !in_array($ns, $wgNoFollowNsExceptions) ) {
1426                         $attribs['rel'] = 'nofollow';
1427                 }
1428                 if ( $this->mOptions->getExternalLinkTarget() ) {
1429                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1430                 }
1431                 return $attribs;
1432         }
1433
1434
1435         /**
1436          * Replace unusual URL escape codes with their equivalent characters
1437          * @param string
1438          * @return string
1439          * @static
1440          * @todo  This can merge genuinely required bits in the path or query string,
1441          *        breaking legit URLs. A proper fix would treat the various parts of
1442          *        the URL differently; as a workaround, just use the output for
1443          *        statistical records, not for actual linking/output.
1444          */
1445         static function replaceUnusualEscapes( $url ) {
1446                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1447                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1448         }
1449
1450         /**
1451          * Callback function used in replaceUnusualEscapes().
1452          * Replaces unusual URL escape codes with their equivalent character
1453          * @static
1454          * @private
1455          */
1456         private static function replaceUnusualEscapesCallback( $matches ) {
1457                 $char = urldecode( $matches[0] );
1458                 $ord = ord( $char );
1459                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1460                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1461                         // No, shouldn't be escaped
1462                         return $char;
1463                 } else {
1464                         // Yes, leave it escaped
1465                         return $matches[0];
1466                 }
1467         }
1468
1469         /**
1470          * make an image if it's allowed, either through the global
1471          * option, through the exception, or through the on-wiki whitelist
1472          * @private
1473          */
1474         function maybeMakeExternalImage( $url ) {
1475                 $sk = $this->mOptions->getSkin();
1476                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1477                 $imagesexception = !empty($imagesfrom);
1478                 $text = false;
1479                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1480                 if( $imagesexception && is_array( $imagesfrom ) ) {
1481                         $imagematch = false;
1482                         foreach( $imagesfrom as $match ) {
1483                                 if( strpos( $url, $match ) === 0 ) {
1484                                         $imagematch = true;
1485                                         break;
1486                                 }
1487                         }
1488                 } elseif( $imagesexception ) {
1489                         $imagematch = (strpos( $url, $imagesfrom ) === 0);
1490                 } else {
1491                         $imagematch = false;
1492                 }
1493                 if ( $this->mOptions->getAllowExternalImages()
1494                      || ( $imagesexception && $imagematch ) ) {
1495                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1496                                 # Image found
1497                                 $text = $sk->makeExternalImage( $url );
1498                         }
1499                 }
1500                 if( !$text && $this->mOptions->getEnableImageWhitelist()
1501                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1502                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1503                         foreach( $whitelist as $entry ) {
1504                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1505                                 if( strpos( $entry, '#' ) === 0 || $entry === '' )
1506                                         continue;
1507                                 if( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1508                                         # Image matches a whitelist entry
1509                                         $text = $sk->makeExternalImage( $url );
1510                                         break;
1511                                 }
1512                         }
1513                 }
1514                 return $text;
1515         }
1516
1517         /**
1518          * Process [[ ]] wikilinks
1519          * @return processed text
1520          *
1521          * @private
1522          */
1523         function replaceInternalLinks( $s ) {
1524                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1525                 return $s;
1526         }
1527
1528         /**
1529          * Process [[ ]] wikilinks (RIL)
1530          * @return LinkHolderArray
1531          *
1532          * @private
1533          */
1534         function replaceInternalLinks2( &$s ) {
1535                 global $wgContLang;
1536
1537                 wfProfileIn( __METHOD__ );
1538
1539                 wfProfileIn( __METHOD__.'-setup' );
1540                 static $tc = FALSE, $e1, $e1_img;
1541                 # the % is needed to support urlencoded titles as well
1542                 if ( !$tc ) {
1543                         $tc = Title::legalChars() . '#%';
1544                         # Match a link having the form [[namespace:link|alternate]]trail
1545                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1546                         # Match cases where there is no "]]", which might still be images
1547                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1548                 }
1549
1550                 $sk = $this->mOptions->getSkin();
1551                 $holders = new LinkHolderArray( $this );
1552
1553                 #split the entire text string on occurences of [[
1554                 $a = StringUtils::explode( '[[', ' ' . $s );
1555                 #get the first element (all text up to first [[), and remove the space we added
1556                 $s = $a->current();
1557                 $a->next();
1558                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1559                 $s = substr( $s, 1 );
1560
1561                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1562                 $e2 = null;
1563                 if ( $useLinkPrefixExtension ) {
1564                         # Match the end of a line for a word that's not followed by whitespace,
1565                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1566                         $e2 = wfMsgForContent( 'linkprefix' );
1567                 }
1568
1569                 if( is_null( $this->mTitle ) ) {
1570                         wfProfileOut( __METHOD__.'-setup' );
1571                         wfProfileOut( __METHOD__ );
1572                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1573                 }
1574                 $nottalk = !$this->mTitle->isTalkPage();
1575
1576                 if ( $useLinkPrefixExtension ) {
1577                         $m = array();
1578                         if ( preg_match( $e2, $s, $m ) ) {
1579                                 $first_prefix = $m[2];
1580                         } else {
1581                                 $first_prefix = false;
1582                         }
1583                 } else {
1584                         $prefix = '';
1585                 }
1586
1587                 if($wgContLang->hasVariants()) {
1588                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1589                 } else {
1590                         $selflink = array($this->mTitle->getPrefixedText());
1591                 }
1592                 $useSubpages = $this->areSubpagesAllowed();
1593                 wfProfileOut( __METHOD__.'-setup' );
1594
1595                 # Loop for each link
1596                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1597                         # Check for excessive memory usage
1598                         if ( $holders->isBig() ) {
1599                                 # Too big
1600                                 # Do the existence check, replace the link holders and clear the array
1601                                 $holders->replace( $s );
1602                                 $holders->clear();
1603                         }
1604
1605                         if ( $useLinkPrefixExtension ) {
1606                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1607                                 if ( preg_match( $e2, $s, $m ) ) {
1608                                         $prefix = $m[2];
1609                                         $s = $m[1];
1610                                 } else {
1611                                         $prefix='';
1612                                 }
1613                                 # first link
1614                                 if($first_prefix) {
1615                                         $prefix = $first_prefix;
1616                                         $first_prefix = false;
1617                                 }
1618                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1619                         }
1620
1621                         $might_be_img = false;
1622
1623                         wfProfileIn( __METHOD__."-e1" );
1624                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1625                                 $text = $m[2];
1626                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1627                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1628                                 # the real problem is with the $e1 regex
1629                                 # See bug 1300.
1630                                 #
1631                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1632                                 # and no image is in sight. See bug 2095.
1633                                 #
1634                                 if( $text !== '' &&
1635                                         substr( $m[3], 0, 1 ) === ']' &&
1636                                         strpos($text, '[') !== false
1637                                 )
1638                                 {
1639                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1640                                         $m[3] = substr( $m[3], 1 );
1641                                 }
1642                                 # fix up urlencoded title texts
1643                                 if( strpos( $m[1], '%' ) !== false ) {
1644                                         # Should anchors '#' also be rejected?
1645                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1646                                 }
1647                                 $trail = $m[3];
1648                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1649                                 $might_be_img = true;
1650                                 $text = $m[2];
1651                                 if ( strpos( $m[1], '%' ) !== false ) {
1652                                         $m[1] = urldecode($m[1]);
1653                                 }
1654                                 $trail = "";
1655                         } else { # Invalid form; output directly
1656                                 $s .= $prefix . '[[' . $line ;
1657                                 wfProfileOut( __METHOD__."-e1" );
1658                                 continue;
1659                         }
1660                         wfProfileOut( __METHOD__."-e1" );
1661                         wfProfileIn( __METHOD__."-misc" );
1662
1663                         # Don't allow internal links to pages containing
1664                         # PROTO: where PROTO is a valid URL protocol; these
1665                         # should be external links.
1666                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1667                                 $s .= $prefix . '[[' . $line ;
1668                                 wfProfileOut( __METHOD__."-misc" );
1669                                 continue;
1670                         }
1671
1672                         # Make subpage if necessary
1673                         if( $useSubpages ) {
1674                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1675                         } else {
1676                                 $link = $m[1];
1677                         }
1678
1679                         $noforce = (substr($m[1], 0, 1) !== ':');
1680                         if (!$noforce) {
1681                                 # Strip off leading ':'
1682                                 $link = substr($link, 1);
1683                         }
1684
1685                         wfProfileOut( __METHOD__."-misc" );
1686                         wfProfileIn( __METHOD__."-title" );
1687                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1688                         if( !$nt ) {
1689                                 $s .= $prefix . '[[' . $line;
1690                                 wfProfileOut( __METHOD__."-title" );
1691                                 continue;
1692                         }
1693
1694                         $ns = $nt->getNamespace();
1695                         $iw = $nt->getInterWiki();
1696                         wfProfileOut( __METHOD__."-title" );
1697
1698                         if ($might_be_img) { # if this is actually an invalid link
1699                                 wfProfileIn( __METHOD__."-might_be_img" );
1700                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1701                                         $found = false;
1702                                         while ( true ) {
1703                                                 #look at the next 'line' to see if we can close it there
1704                                                 $a->next();
1705                                                 $next_line = $a->current();
1706                                                 if ( $next_line === false || $next_line === null ) {
1707                                                         break;
1708                                                 }
1709                                                 $m = explode( ']]', $next_line, 3 );
1710                                                 if ( count( $m ) == 3 ) {
1711                                                         # the first ]] closes the inner link, the second the image
1712                                                         $found = true;
1713                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1714                                                         $trail = $m[2];
1715                                                         break;
1716                                                 } elseif ( count( $m ) == 2 ) {
1717                                                         #if there's exactly one ]] that's fine, we'll keep looking
1718                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1719                                                 } else {
1720                                                         #if $next_line is invalid too, we need look no further
1721                                                         $text .= '[[' . $next_line;
1722                                                         break;
1723                                                 }
1724                                         }
1725                                         if ( !$found ) {
1726                                                 # we couldn't find the end of this imageLink, so output it raw
1727                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1728                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1729                                                 $s .= "{$prefix}[[$link|$text";
1730                                                 # note: no $trail, because without an end, there *is* no trail
1731                                                 wfProfileOut( __METHOD__."-might_be_img" );
1732                                                 continue;
1733                                         }
1734                                 } else { #it's not an image, so output it raw
1735                                         $s .= "{$prefix}[[$link|$text";
1736                                         # note: no $trail, because without an end, there *is* no trail
1737                                         wfProfileOut( __METHOD__."-might_be_img" );
1738                                         continue;
1739                                 }
1740                                 wfProfileOut( __METHOD__."-might_be_img" );
1741                         }
1742
1743                         $wasblank = ( '' == $text );
1744                         if( $wasblank ) $text = $link;
1745
1746                         # Link not escaped by : , create the various objects
1747                         if( $noforce ) {
1748
1749                                 # Interwikis
1750                                 wfProfileIn( __METHOD__."-interwiki" );
1751                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1752                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1753                                         $s = rtrim($s . $prefix);
1754                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1755                                         wfProfileOut( __METHOD__."-interwiki" );
1756                                         continue;
1757                                 }
1758                                 wfProfileOut( __METHOD__."-interwiki" );
1759
1760                                 if ( $ns == NS_IMAGE ) {
1761                                         wfProfileIn( __METHOD__."-image" );
1762                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1763                                                 # recursively parse links inside the image caption
1764                                                 # actually, this will parse them in any other parameters, too,
1765                                                 # but it might be hard to fix that, and it doesn't matter ATM
1766                                                 $text = $this->replaceExternalLinks($text);
1767                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1768
1769                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1770                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1771                                         }
1772                                         $this->mOutput->addImage( $nt->getDBkey() );
1773                                         wfProfileOut( __METHOD__."-image" );
1774                                         continue;
1775
1776                                 }
1777
1778                                 if ( $ns == NS_CATEGORY ) {
1779                                         wfProfileIn( __METHOD__."-category" );
1780                                         $s = rtrim($s . "\n"); # bug 87
1781
1782                                         if ( $wasblank ) {
1783                                                 $sortkey = $this->getDefaultSort();
1784                                         } else {
1785                                                 $sortkey = $text;
1786                                         }
1787                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1788                                         $sortkey = str_replace( "\n", '', $sortkey );
1789                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1790                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1791
1792                                         /**
1793                                          * Strip the whitespace Category links produce, see bug 87
1794                                          * @todo We might want to use trim($tmp, "\n") here.
1795                                          */
1796                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1797
1798                                         wfProfileOut( __METHOD__."-category" );
1799                                         continue;
1800                                 }
1801                         }
1802
1803                         # Self-link checking
1804                         if( $nt->getFragment() === '' && $nt->getNamespace() != NS_SPECIAL ) {
1805                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1806                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1807                                         continue;
1808                                 }
1809                         }
1810
1811                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1812                         if( $ns == NS_MEDIA ) {
1813                                 # Give extensions a chance to select the file revision for us
1814                                 $skip = $time = false;
1815                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1816                                 if ( $skip ) {
1817                                         $link = $sk->link( $nt );
1818                                 } else {
1819                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1820                                 }
1821                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1822                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1823                                 $this->mOutput->addImage( $nt->getDBkey() );
1824                                 continue;
1825                         } elseif( $ns == NS_SPECIAL ) {
1826                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1827                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1828                                 } else {
1829                                         $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1830                                 }
1831                                 continue;
1832                         } elseif( $ns == NS_IMAGE ) {
1833                                 $img = wfFindFile( $nt );
1834                                 if( $img ) {
1835                                         // Force a blue link if the file exists; may be a remote
1836                                         // upload on the shared repository, and we want to see its
1837                                         // auto-generated page.
1838                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1839                                         $this->mOutput->addLink( $nt );
1840                                         continue;
1841                                 }
1842                         }
1843                         $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1844                 }
1845                 wfProfileOut( __METHOD__ );
1846                 return $holders;
1847         }
1848
1849         /**
1850          * Make a link placeholder. The text returned can be later resolved to a real link with
1851          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1852          * parsing of interwiki links, and secondly to allow all existence checks and
1853          * article length checks (for stub links) to be bundled into a single query.
1854          *
1855          * @deprecated
1856          */
1857         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1858                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1859         }
1860
1861         /**
1862          * Render a forced-blue link inline; protect against double expansion of
1863          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1864          * Since this little disaster has to split off the trail text to avoid
1865          * breaking URLs in the following text without breaking trails on the
1866          * wiki links, it's been made into a horrible function.
1867          *
1868          * @param Title $nt
1869          * @param string $text
1870          * @param string $query
1871          * @param string $trail
1872          * @param string $prefix
1873          * @return string HTML-wikitext mix oh yuck
1874          */
1875         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1876                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1877                 $sk = $this->mOptions->getSkin();
1878                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1879                 return $this->armorLinks( $link ) . $trail;
1880         }
1881
1882         /**
1883          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1884          * going to go through further parsing steps before inline URL expansion.
1885          *
1886          * Not needed quite as much as it used to be since free links are a bit
1887          * more sensible these days. But bracketed links are still an issue.
1888          *
1889          * @param string more-or-less HTML
1890          * @return string less-or-more HTML with NOPARSE bits
1891          */
1892         function armorLinks( $text ) {
1893                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1894                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1895         }
1896
1897         /**
1898          * Return true if subpage links should be expanded on this page.
1899          * @return bool
1900          */
1901         function areSubpagesAllowed() {
1902                 # Some namespaces don't allow subpages
1903                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1904         }
1905
1906         /**
1907          * Handle link to subpage if necessary
1908          * @param string $target the source of the link
1909          * @param string &$text the link text, modified as necessary
1910          * @return string the full name of the link
1911          * @private
1912          */
1913         function maybeDoSubpageLink($target, &$text) {
1914                 # Valid link forms:
1915                 # Foobar -- normal
1916                 # :Foobar -- override special treatment of prefix (images, language links)
1917                 # /Foobar -- convert to CurrentPage/Foobar
1918                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1919                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1920                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1921
1922                 wfProfileIn( __METHOD__ );
1923                 $ret = $target; # default return value is no change
1924
1925                 # Some namespaces don't allow subpages,
1926                 # so only perform processing if subpages are allowed
1927                 if( $this->areSubpagesAllowed() ) {
1928                         $hash = strpos( $target, '#' );
1929                         if( $hash !== false ) {
1930                                 $suffix = substr( $target, $hash );
1931                                 $target = substr( $target, 0, $hash );
1932                         } else {
1933                                 $suffix = '';
1934                         }
1935                         # bug 7425
1936                         $target = trim( $target );
1937                         # Look at the first character
1938                         if( $target != '' && $target{0} === '/' ) {
1939                                 # / at end means we don't want the slash to be shown
1940                                 $m = array();
1941                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1942                                 if( $trailingSlashes ) {
1943                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1944                                 } else {
1945                                         $noslash = substr( $target, 1 );
1946                                 }
1947
1948                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1949                                 if( '' === $text ) {
1950                                         $text = $target . $suffix;
1951                                 } # this might be changed for ugliness reasons
1952                         } else {
1953                                 # check for .. subpage backlinks
1954                                 $dotdotcount = 0;
1955                                 $nodotdot = $target;
1956                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1957                                         ++$dotdotcount;
1958                                         $nodotdot = substr( $nodotdot, 3 );
1959                                 }
1960                                 if($dotdotcount > 0) {
1961                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1962                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1963                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1964                                                 # / at the end means don't show full path
1965                                                 if( substr( $nodotdot, -1, 1 ) === '/' ) {
1966                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1967                                                         if( '' === $text ) {
1968                                                                 $text = $nodotdot . $suffix;
1969                                                         }
1970                                                 }
1971                                                 $nodotdot = trim( $nodotdot );
1972                                                 if( $nodotdot != '' ) {
1973                                                         $ret .= '/' . $nodotdot;
1974                                                 }
1975                                                 $ret .= $suffix;
1976                                         }
1977                                 }
1978                         }
1979                 }
1980
1981                 wfProfileOut( __METHOD__ );
1982                 return $ret;
1983         }
1984
1985         /**#@+
1986          * Used by doBlockLevels()
1987          * @private
1988          */
1989         /* private */ function closeParagraph() {
1990                 $result = '';
1991                 if ( '' != $this->mLastSection ) {
1992                         $result = '</' . $this->mLastSection  . ">\n";
1993                 }
1994                 $this->mInPre = false;
1995                 $this->mLastSection = '';
1996                 return $result;
1997         }
1998         # getCommon() returns the length of the longest common substring
1999         # of both arguments, starting at the beginning of both.
2000         #
2001         /* private */ function getCommon( $st1, $st2 ) {
2002                 $fl = strlen( $st1 );
2003                 $shorter = strlen( $st2 );
2004                 if ( $fl < $shorter ) { $shorter = $fl; }
2005
2006                 for ( $i = 0; $i < $shorter; ++$i ) {
2007                         if ( $st1{$i} != $st2{$i} ) { break; }
2008                 }
2009                 return $i;
2010         }
2011         # These next three functions open, continue, and close the list
2012         # element appropriate to the prefix character passed into them.
2013         #
2014         /* private */ function openList( $char ) {
2015                 $result = $this->closeParagraph();
2016
2017                 if ( '*' === $char ) { $result .= '<ul><li>'; }
2018                 else if ( '#' === $char ) { $result .= '<ol><li>'; }
2019                 else if ( ':' === $char ) { $result .= '<dl><dd>'; }
2020                 else if ( ';' === $char ) {
2021                         $result .= '<dl><dt>';
2022                         $this->mDTopen = true;
2023                 }
2024                 else { $result = '<!-- ERR 1 -->'; }
2025
2026                 return $result;
2027         }
2028
2029         /* private */ function nextItem( $char ) {
2030                 if ( '*' === $char || '#' === $char ) { return '</li><li>'; }
2031                 else if ( ':' === $char || ';' === $char ) {
2032                         $close = '</dd>';
2033                         if ( $this->mDTopen ) { $close = '</dt>'; }
2034                         if ( ';' === $char ) {
2035                                 $this->mDTopen = true;
2036                                 return $close . '<dt>';
2037                         } else {
2038                                 $this->mDTopen = false;
2039                                 return $close . '<dd>';
2040                         }
2041                 }
2042                 return '<!-- ERR 2 -->';
2043         }
2044
2045         /* private */ function closeList( $char ) {
2046                 if ( '*' === $char ) { $text = '</li></ul>'; }
2047                 else if ( '#' === $char ) { $text = '</li></ol>'; }
2048                 else if ( ':' === $char ) {
2049                         if ( $this->mDTopen ) {
2050                                 $this->mDTopen = false;
2051                                 $text = '</dt></dl>';
2052                         } else {
2053                                 $text = '</dd></dl>';
2054                         }
2055                 }
2056                 else {  return '<!-- ERR 3 -->'; }
2057                 return $text."\n";
2058         }
2059         /**#@-*/
2060
2061         /**
2062          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
2063          *
2064          * @private
2065          * @return string the lists rendered as HTML
2066          */
2067         function doBlockLevels( $text, $linestart ) {
2068                 wfProfileIn( __METHOD__ );
2069
2070                 # Parsing through the text line by line.  The main thing
2071                 # happening here is handling of block-level elements p, pre,
2072                 # and making lists from lines starting with * # : etc.
2073                 #
2074                 $textLines = StringUtils::explode( "\n", $text );
2075
2076                 $lastPrefix = $output = '';
2077                 $this->mDTopen = $inBlockElem = false;
2078                 $prefixLength = 0;
2079                 $paragraphStack = false;
2080
2081                 foreach ( $textLines as $oLine ) {
2082                         # Fix up $linestart
2083                         if ( !$linestart ) {
2084                                 $output .= $oLine;
2085                                 $linestart = true;
2086                                 continue;
2087                         }
2088
2089                         $lastPrefixLength = strlen( $lastPrefix );
2090                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2091                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2092                         if ( !$this->mInPre ) {
2093                                 # Multiple prefixes may abut each other for nested lists.
2094                                 $prefixLength = strspn( $oLine, '*#:;' );
2095                                 $prefix = substr( $oLine, 0, $prefixLength );
2096
2097                                 # eh?
2098                                 $prefix2 = str_replace( ';', ':', $prefix );
2099                                 $t = substr( $oLine, $prefixLength );
2100                                 $this->mInPre = (bool)$preOpenMatch;
2101                         } else {
2102                                 # Don't interpret any other prefixes in preformatted text
2103                                 $prefixLength = 0;
2104                                 $prefix = $prefix2 = '';
2105                                 $t = $oLine;
2106                         }
2107
2108                         # List generation
2109                         if( $prefixLength && $lastPrefix === $prefix2 ) {
2110                                 # Same as the last item, so no need to deal with nesting or opening stuff
2111                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2112                                 $paragraphStack = false;
2113
2114                                 if ( substr( $prefix, -1 ) === ';') {
2115                                         # The one nasty exception: definition lists work like this:
2116                                         # ; title : definition text
2117                                         # So we check for : in the remainder text to split up the
2118                                         # title and definition, without b0rking links.
2119                                         $term = $t2 = '';
2120                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2121                                                 $t = $t2;
2122                                                 $output .= $term . $this->nextItem( ':' );
2123                                         }
2124                                 }
2125                         } elseif( $prefixLength || $lastPrefixLength ) {
2126                                 # Either open or close a level...
2127                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2128                                 $paragraphStack = false;
2129
2130                                 while( $commonPrefixLength < $lastPrefixLength ) {
2131                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2132                                         --$lastPrefixLength;
2133                                 }
2134                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2135                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2136                                 }
2137                                 while ( $prefixLength > $commonPrefixLength ) {
2138                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2139                                         $output .= $this->openList( $char );
2140
2141                                         if ( ';' === $char ) {
2142                                                 # FIXME: This is dupe of code above
2143                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2144                                                         $t = $t2;
2145                                                         $output .= $term . $this->nextItem( ':' );
2146                                                 }
2147                                         }
2148                                         ++$commonPrefixLength;
2149                                 }
2150                                 $lastPrefix = $prefix2;
2151                         }
2152                         if( 0 == $prefixLength ) {
2153                                 wfProfileIn( __METHOD__."-paragraph" );
2154                                 # No prefix (not in list)--go to paragraph mode
2155                                 // XXX: use a stack for nestable elements like span, table and div
2156                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2157                                 $closematch = preg_match(
2158                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2159                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2160                                 if ( $openmatch or $closematch ) {
2161                                         $paragraphStack = false;
2162                                         # TODO bug 5718: paragraph closed
2163                                         $output .= $this->closeParagraph();
2164                                         if ( $preOpenMatch and !$preCloseMatch ) {
2165                                                 $this->mInPre = true;
2166                                         }
2167                                         if ( $closematch ) {
2168                                                 $inBlockElem = false;
2169                                         } else {
2170                                                 $inBlockElem = true;
2171                                         }
2172                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2173                                         if ( ' ' == $t{0} and ( $this->mLastSection === 'pre' or trim($t) != '' ) ) {
2174                                                 // pre
2175                                                 if ($this->mLastSection !== 'pre') {
2176                                                         $paragraphStack = false;
2177                                                         $output .= $this->closeParagraph().'<pre>';
2178                                                         $this->mLastSection = 'pre';
2179                                                 }
2180                                                 $t = substr( $t, 1 );
2181                                         } else {
2182                                                 // paragraph
2183                                                 if ( '' == trim($t) ) {
2184                                                         if ( $paragraphStack ) {
2185                                                                 $output .= $paragraphStack.'<br />';
2186                                                                 $paragraphStack = false;
2187                                                                 $this->mLastSection = 'p';
2188                                                         } else {
2189                                                                 if ($this->mLastSection !== 'p' ) {
2190                                                                         $output .= $this->closeParagraph();
2191                                                                         $this->mLastSection = '';
2192                                                                         $paragraphStack = '<p>';
2193                                                                 } else {
2194                                                                         $paragraphStack = '</p><p>';
2195                                                                 }
2196                                                         }
2197                                                 } else {
2198                                                         if ( $paragraphStack ) {
2199                                                                 $output .= $paragraphStack;
2200                                                                 $paragraphStack = false;
2201                                                                 $this->mLastSection = 'p';
2202                                                         } else if ($this->mLastSection !== 'p') {
2203                                                                 $output .= $this->closeParagraph().'<p>';
2204                                                                 $this->mLastSection = 'p';
2205                                                         }
2206                                                 }
2207                                         }
2208                                 }
2209                                 wfProfileOut( __METHOD__."-paragraph" );
2210                         }
2211                         // somewhere above we forget to get out of pre block (bug 785)
2212                         if($preCloseMatch && $this->mInPre) {
2213                                 $this->mInPre = false;
2214                         }
2215                         if ($paragraphStack === false) {
2216                                 $output .= $t."\n";
2217                         }
2218                 }
2219                 while ( $prefixLength ) {
2220                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2221                         --$prefixLength;
2222                 }
2223                 if ( '' != $this->mLastSection ) {
2224                         $output .= '</' . $this->mLastSection . '>';
2225                         $this->mLastSection = '';
2226                 }
2227
2228                 wfProfileOut( __METHOD__ );
2229                 return $output;
2230         }
2231
2232         /**
2233          * Split up a string on ':', ignoring any occurences inside tags
2234          * to prevent illegal overlapping.
2235          * @param string $str the string to split
2236          * @param string &$before set to everything before the ':'
2237          * @param string &$after set to everything after the ':'
2238          * return string the position of the ':', or false if none found
2239          */
2240         function findColonNoLinks($str, &$before, &$after) {
2241                 wfProfileIn( __METHOD__ );
2242
2243                 $pos = strpos( $str, ':' );
2244                 if( $pos === false ) {
2245                         // Nothing to find!
2246                         wfProfileOut( __METHOD__ );
2247                         return false;
2248                 }
2249
2250                 $lt = strpos( $str, '<' );
2251                 if( $lt === false || $lt > $pos ) {
2252                         // Easy; no tag nesting to worry about
2253                         $before = substr( $str, 0, $pos );
2254                         $after = substr( $str, $pos+1 );
2255                         wfProfileOut( __METHOD__ );
2256                         return $pos;
2257                 }
2258
2259                 // Ugly state machine to walk through avoiding tags.
2260                 $state = self::COLON_STATE_TEXT;
2261                 $stack = 0;
2262                 $len = strlen( $str );
2263                 for( $i = 0; $i < $len; $i++ ) {
2264                         $c = $str{$i};
2265
2266                         switch( $state ) {
2267                         // (Using the number is a performance hack for common cases)
2268                         case 0: // self::COLON_STATE_TEXT:
2269                                 switch( $c ) {
2270                                 case "<":
2271                                         // Could be either a <start> tag or an </end> tag
2272                                         $state = self::COLON_STATE_TAGSTART;
2273                                         break;
2274                                 case ":":
2275                                         if( $stack == 0 ) {
2276                                                 // We found it!
2277                                                 $before = substr( $str, 0, $i );
2278                                                 $after = substr( $str, $i + 1 );
2279                                                 wfProfileOut( __METHOD__ );
2280                                                 return $i;
2281                                         }
2282                                         // Embedded in a tag; don't break it.
2283                                         break;
2284                                 default:
2285                                         // Skip ahead looking for something interesting
2286                                         $colon = strpos( $str, ':', $i );
2287                                         if( $colon === false ) {
2288                                                 // Nothing else interesting
2289                                                 wfProfileOut( __METHOD__ );
2290                                                 return false;
2291                                         }
2292                                         $lt = strpos( $str, '<', $i );
2293                                         if( $stack === 0 ) {
2294                                                 if( $lt === false || $colon < $lt ) {
2295                                                         // We found it!
2296                                                         $before = substr( $str, 0, $colon );
2297                                                         $after = substr( $str, $colon + 1 );
2298                                                         wfProfileOut( __METHOD__ );
2299                                                         return $i;
2300                                                 }
2301                                         }
2302                                         if( $lt === false ) {
2303                                                 // Nothing else interesting to find; abort!
2304                                                 // We're nested, but there's no close tags left. Abort!
2305                                                 break 2;
2306                                         }
2307                                         // Skip ahead to next tag start
2308                                         $i = $lt;
2309                                         $state = self::COLON_STATE_TAGSTART;
2310                                 }
2311                                 break;
2312                         case 1: // self::COLON_STATE_TAG:
2313                                 // In a <tag>
2314                                 switch( $c ) {
2315                                 case ">":
2316                                         $stack++;
2317                                         $state = self::COLON_STATE_TEXT;
2318                                         break;
2319                                 case "/":
2320                                         // Slash may be followed by >?
2321                                         $state = self::COLON_STATE_TAGSLASH;
2322                                         break;
2323                                 default:
2324                                         // ignore
2325                                 }
2326                                 break;
2327                         case 2: // self::COLON_STATE_TAGSTART:
2328                                 switch( $c ) {
2329                                 case "/":
2330                                         $state = self::COLON_STATE_CLOSETAG;
2331                                         break;
2332                                 case "!":
2333                                         $state = self::COLON_STATE_COMMENT;
2334                                         break;
2335                                 case ">":
2336                                         // Illegal early close? This shouldn't happen D:
2337                                         $state = self::COLON_STATE_TEXT;
2338                                         break;
2339                                 default:
2340                                         $state = self::COLON_STATE_TAG;
2341                                 }
2342                                 break;
2343                         case 3: // self::COLON_STATE_CLOSETAG:
2344                                 // In a </tag>
2345                                 if( $c === ">" ) {
2346                                         $stack--;
2347                                         if( $stack < 0 ) {
2348                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2349                                                 wfProfileOut( __METHOD__ );
2350                                                 return false;
2351                                         }
2352                                         $state = self::COLON_STATE_TEXT;
2353                                 }
2354                                 break;
2355                         case self::COLON_STATE_TAGSLASH:
2356                                 if( $c === ">" ) {
2357                                         // Yes, a self-closed tag <blah/>
2358                                         $state = self::COLON_STATE_TEXT;
2359                                 } else {
2360                                         // Probably we're jumping the gun, and this is an attribute
2361                                         $state = self::COLON_STATE_TAG;
2362                                 }
2363                                 break;
2364                         case 5: // self::COLON_STATE_COMMENT:
2365                                 if( $c === "-" ) {
2366                                         $state = self::COLON_STATE_COMMENTDASH;
2367                                 }
2368                                 break;
2369                         case self::COLON_STATE_COMMENTDASH:
2370                                 if( $c === "-" ) {
2371                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2372                                 } else {
2373                                         $state = self::COLON_STATE_COMMENT;
2374                                 }
2375                                 break;
2376                         case self::COLON_STATE_COMMENTDASHDASH:
2377                                 if( $c === ">" ) {
2378                                         $state = self::COLON_STATE_TEXT;
2379                                 } else {
2380                                         $state = self::COLON_STATE_COMMENT;
2381                                 }
2382                                 break;
2383                         default:
2384                                 throw new MWException( "State machine error in " . __METHOD__ );
2385                         }
2386                 }
2387                 if( $stack > 0 ) {
2388                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2389                         return false;
2390                 }
2391                 wfProfileOut( __METHOD__ );
2392                 return false;
2393         }
2394
2395         /**
2396          * Return value of a magic variable (like PAGENAME)
2397          *
2398          * @private
2399          */
2400         function getVariableValue( $index ) {
2401                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2402
2403                 /**
2404                  * Some of these require message or data lookups and can be
2405                  * expensive to check many times.
2406                  */
2407                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2408                         if ( isset( $this->mVarCache[$index] ) ) {
2409                                 return $this->mVarCache[$index];
2410                         }
2411                 }
2412
2413                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2414                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2415
2416                 # Use the time zone
2417                 global $wgLocaltimezone;
2418                 if ( isset( $wgLocaltimezone ) ) {
2419                         $oldtz = getenv( 'TZ' );
2420                         putenv( 'TZ='.$wgLocaltimezone );
2421                 }
2422
2423                 wfSuppressWarnings(); // E_STRICT system time bitching
2424                 $localTimestamp = date( 'YmdHis', $ts );
2425                 $localMonth = date( 'm', $ts );
2426                 $localMonthName = date( 'n', $ts );
2427                 $localDay = date( 'j', $ts );
2428                 $localDay2 = date( 'd', $ts );
2429                 $localDayOfWeek = date( 'w', $ts );
2430                 $localWeek = date( 'W', $ts );
2431                 $localYear = date( 'Y', $ts );
2432                 $localHour = date( 'H', $ts );
2433                 if ( isset( $wgLocaltimezone ) ) {
2434                         putenv( 'TZ='.$oldtz );
2435                 }
2436                 wfRestoreWarnings();
2437
2438                 switch ( $index ) {
2439                         case 'currentmonth':
2440                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2441                         case 'currentmonthname':
2442                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2443                         case 'currentmonthnamegen':
2444                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2445                         case 'currentmonthabbrev':
2446                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2447                         case 'currentday':
2448                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2449                         case 'currentday2':
2450                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2451                         case 'localmonth':
2452                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localMonth );
2453                         case 'localmonthname':
2454                                 return $this->mVarCache[$index] = $wgContLang->getMonthName( $localMonthName );
2455                         case 'localmonthnamegen':
2456                                 return $this->mVarCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2457                         case 'localmonthabbrev':
2458                                 return $this->mVarCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2459                         case 'localday':
2460                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay );
2461                         case 'localday2':
2462                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDay2 );
2463                         case 'pagename':
2464                                 return wfEscapeWikiText( $this->mTitle->getText() );
2465                         case 'pagenamee':
2466                                 return $this->mTitle->getPartialURL();
2467                         case 'fullpagename':
2468                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2469                         case 'fullpagenamee':
2470                                 return $this->mTitle->getPrefixedURL();
2471                         case 'subpagename':
2472                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2473                         case 'subpagenamee':
2474                                 return $this->mTitle->getSubpageUrlForm();
2475                         case 'basepagename':
2476                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2477                         case 'basepagenamee':
2478                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2479                         case 'talkpagename':
2480                                 if( $this->mTitle->canTalk() ) {
2481                                         $talkPage = $this->mTitle->getTalkPage();
2482                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2483                                 } else {
2484                                         return '';
2485                                 }
2486                         case 'talkpagenamee':
2487                                 if( $this->mTitle->canTalk() ) {
2488                                         $talkPage = $this->mTitle->getTalkPage();
2489                                         return $talkPage->getPrefixedUrl();
2490                                 } else {
2491                                         return '';
2492                                 }
2493                         case 'subjectpagename':
2494                                 $subjPage = $this->mTitle->getSubjectPage();
2495                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2496                         case 'subjectpagenamee':
2497                                 $subjPage = $this->mTitle->getSubjectPage();
2498                                 return $subjPage->getPrefixedUrl();
2499                         case 'revisionid':
2500                                 // Let the edit saving system know we should parse the page
2501                                 // *after* a revision ID has been assigned.
2502                                 $this->mOutput->setFlag( 'vary-revision' );
2503                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2504                                 return $this->mRevisionId;
2505                         case 'revisionday':
2506                                 // Let the edit saving system know we should parse the page
2507                                 // *after* a revision ID has been assigned. This is for null edits.
2508                                 $this->mOutput->setFlag( 'vary-revision' );
2509                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2510                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2511                         case 'revisionday2':
2512                                 // Let the edit saving system know we should parse the page
2513                                 // *after* a revision ID has been assigned. This is for null edits.
2514                                 $this->mOutput->setFlag( 'vary-revision' );
2515                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2516                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2517                         case 'revisionmonth':
2518                                 // Let the edit saving system know we should parse the page
2519                                 // *after* a revision ID has been assigned. This is for null edits.
2520                                 $this->mOutput->setFlag( 'vary-revision' );
2521                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2522                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2523                         case 'revisionyear':
2524                                 // Let the edit saving system know we should parse the page
2525                                 // *after* a revision ID has been assigned. This is for null edits.
2526                                 $this->mOutput->setFlag( 'vary-revision' );
2527                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2528                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2529                         case 'revisiontimestamp':
2530                                 // Let the edit saving system know we should parse the page
2531                                 // *after* a revision ID has been assigned. This is for null edits.
2532                                 $this->mOutput->setFlag( 'vary-revision' );
2533                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2534                                 return $this->getRevisionTimestamp();
2535                         case 'namespace':
2536                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2537                         case 'namespacee':
2538                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2539                         case 'talkspace':
2540                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2541                         case 'talkspacee':
2542                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2543                         case 'subjectspace':
2544                                 return $this->mTitle->getSubjectNsText();
2545                         case 'subjectspacee':
2546                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2547                         case 'currentdayname':
2548                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2549                         case 'currentyear':
2550                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2551                         case 'currenttime':
2552                                 return $this->mVarCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2553                         case 'currenthour':
2554                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2555                         case 'currentweek':
2556                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2557                                 // int to remove the padding
2558                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2559                         case 'currentdow':
2560                                 return $this->mVarCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2561                         case 'localdayname':
2562                                 return $this->mVarCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2563                         case 'localyear':
2564                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localYear, true );
2565                         case 'localtime':
2566                                 return $this->mVarCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2567                         case 'localhour':
2568                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localHour, true );
2569                         case 'localweek':
2570                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2571                                 // int to remove the padding
2572                                 return $this->mVarCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2573                         case 'localdow':
2574                                 return $this->mVarCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2575                         case 'numberofarticles':
2576                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2577                         case 'numberoffiles':
2578                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2579                         case 'numberofusers':
2580                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2581                         case 'numberofpages':
2582                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2583                         case 'numberofadmins':
2584                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::numberingroup('sysop') );
2585                         case 'numberofedits':
2586                                 return $this->mVarCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2587                         case 'currenttimestamp':
2588                                 return $this->mVarCache[$index] = wfTimestamp( TS_MW, $ts );
2589                         case 'localtimestamp':
2590                                 return $this->mVarCache[$index] = $localTimestamp;
2591                         case 'currentversion':
2592                                 return $this->mVarCache[$index] = SpecialVersion::getVersion();
2593                         case 'sitename':
2594                                 return $wgSitename;
2595                         case 'server':
2596                                 return $wgServer;
2597                         case 'servername':
2598                                 return $wgServerName;
2599                         case 'scriptpath':
2600                                 return $wgScriptPath;
2601                         case 'directionmark':
2602                                 return $wgContLang->getDirMark();
2603                         case 'contentlanguage':
2604                                 global $wgContLanguageCode;
2605                                 return $wgContLanguageCode;
2606                         default:
2607                                 $ret = null;
2608                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret ) ) )
2609                                         return $ret;
2610                                 else
2611                                         return null;
2612                 }
2613         }
2614
2615         /**
2616          * initialise the magic variables (like CURRENTMONTHNAME)
2617          *
2618          * @private
2619          */
2620         function initialiseVariables() {
2621                 wfProfileIn( __METHOD__ );
2622                 $variableIDs = MagicWord::getVariableIDs();
2623
2624                 $this->mVariables = new MagicWordArray( $variableIDs );
2625                 wfProfileOut( __METHOD__ );
2626         }
2627
2628         /**
2629          * Preprocess some wikitext and return the document tree.
2630          * This is the ghost of replace_variables().
2631          *
2632          * @param string $text The text to parse
2633          * @param integer flags Bitwise combination of:
2634          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2635          *                                     included. Default is to assume a direct page view.
2636          *
2637          * The generated DOM tree must depend only on the input text and the flags.
2638          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2639          *
2640          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2641          * change in the DOM tree for a given text, must be passed through the section identifier
2642          * in the section edit link and thus back to extractSections().
2643          *
2644          * The output of this function is currently only cached in process memory, but a persistent
2645          * cache may be implemented at a later date which takes further advantage of these strict
2646          * dependency requirements.
2647          *
2648          * @private
2649          */
2650         function preprocessToDom ( $text, $flags = 0 ) {
2651                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2652                 return $dom;
2653         }
2654
2655         /*
2656          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2657          */
2658         public static function splitWhitespace( $s ) {
2659                 $ltrimmed = ltrim( $s );
2660                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2661                 $trimmed = rtrim( $ltrimmed );
2662                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2663                 if ( $diff > 0 ) {
2664                         $w2 = substr( $ltrimmed, -$diff );
2665                 } else {
2666                         $w2 = '';
2667                 }
2668                 return array( $w1, $trimmed, $w2 );
2669         }
2670
2671         /**
2672          * Replace magic variables, templates, and template arguments
2673          * with the appropriate text. Templates are substituted recursively,
2674          * taking care to avoid infinite loops.
2675          *
2676          * Note that the substitution depends on value of $mOutputType:
2677          *  self::OT_WIKI: only {{subst:}} templates
2678          *  self::OT_PREPROCESS: templates but not extension tags
2679          *  self::OT_HTML: all templates and extension tags
2680          *
2681          * @param string $tex The text to transform
2682          * @param PPFrame $frame Object describing the arguments passed to the template.
2683          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2684          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2685          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2686          * @private
2687          */
2688         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2689                 # Prevent too big inclusions
2690                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2691                         return $text;
2692                 }
2693
2694                 wfProfileIn( __METHOD__ );
2695
2696                 if ( $frame === false ) {
2697                         $frame = $this->getPreprocessor()->newFrame();
2698                 } elseif ( !( $frame instanceof PPFrame ) ) {
2699                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2700                         $frame = $this->getPreprocessor()->newCustomFrame($frame);
2701                 }
2702
2703                 $dom = $this->preprocessToDom( $text );
2704                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2705                 $text = $frame->expand( $dom, $flags );
2706
2707                 wfProfileOut( __METHOD__ );
2708                 return $text;
2709         }
2710
2711         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2712         static function createAssocArgs( $args ) {
2713                 $assocArgs = array();
2714                 $index = 1;
2715                 foreach( $args as $arg ) {
2716                         $eqpos = strpos( $arg, '=' );
2717                         if ( $eqpos === false ) {
2718                                 $assocArgs[$index++] = $arg;
2719                         } else {
2720                                 $name = trim( substr( $arg, 0, $eqpos ) );
2721                                 $value = trim( substr( $arg, $eqpos+1 ) );
2722                                 if ( $value === false ) {
2723                                         $value = '';
2724                                 }
2725                                 if ( $name !== false ) {
2726                                         $assocArgs[$name] = $value;
2727                                 }
2728                         }
2729                 }
2730
2731                 return $assocArgs;
2732         }
2733
2734         /**
2735          * Warn the user when a parser limitation is reached
2736          * Will warn at most once the user per limitation type
2737          *
2738          * @param string $limitationType, should be one of:
2739          *   'expensive-parserfunction' (corresponding messages: 'expensive-parserfunction-warning', 'expensive-parserfunction-category')
2740          *   'post-expand-template-argument' (corresponding messages: 'post-expand-template-argument-warning', 'post-expand-template-argument-category')
2741          *   'post-expand-template-inclusion' (corresponding messages: 'post-expand-template-inclusion-warning', 'post-expand-template-inclusion-category')
2742          * @params int $current, $max When an explicit limit has been
2743          *       exceeded, provide the values (optional)
2744          */
2745         function limitationWarn( $limitationType, $current=null, $max=null) {
2746                 $msgName = $limitationType . '-warning';
2747                 //does no harm if $current and $max are present but are unnecessary for the message
2748                 $warning = wfMsgExt( $msgName, array( 'parsemag', 'escape' ), $current, $max );
2749                 $this->mOutput->addWarning( $warning );
2750                 $cat = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( $limitationType . '-category' ) );
2751                 if ( $cat ) {
2752                         $this->mOutput->addCategory( $cat->getDBkey(), $this->getDefaultSort() );
2753                 }
2754         }
2755
2756         /**
2757          * Return the text of a template, after recursively
2758          * replacing any variables or templates within the template.
2759          *
2760          * @param array $piece The parts of the template
2761          *  $piece['title']: the title, i.e. the part before the |
2762          *  $piece['parts']: the parameter array
2763          *  $piece['lineStart']: whether the brace was at the start of a line
2764          * @param PPFrame The current frame, contains template arguments
2765          * @return string the text of the template
2766          * @private
2767          */
2768         function braceSubstitution( $piece, $frame ) {
2769                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2770                 wfProfileIn( __METHOD__ );
2771                 wfProfileIn( __METHOD__.'-setup' );
2772
2773                 # Flags
2774                 $found = false;             # $text has been filled
2775                 $nowiki = false;            # wiki markup in $text should be escaped
2776                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2777                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2778                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2779                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2780
2781                 # Title object, where $text came from
2782                 $title = NULL;
2783
2784                 # $part1 is the bit before the first |, and must contain only title characters.
2785                 # Various prefixes will be stripped from it later.
2786                 $titleWithSpaces = $frame->expand( $piece['title'] );
2787                 $part1 = trim( $titleWithSpaces );
2788                 $titleText = false;
2789
2790                 # Original title text preserved for various purposes
2791                 $originalTitle = $part1;
2792
2793                 # $args is a list of argument nodes, starting from index 0, not including $part1
2794                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2795                 wfProfileOut( __METHOD__.'-setup' );
2796
2797                 # SUBST
2798                 wfProfileIn( __METHOD__.'-modifiers' );
2799                 if ( !$found ) {
2800                         $mwSubst = MagicWord::get( 'subst' );
2801                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2802                                 # One of two possibilities is true:
2803                                 # 1) Found SUBST but not in the PST phase
2804                                 # 2) Didn't find SUBST and in the PST phase
2805                                 # In either case, return without further processing
2806                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2807                                 $isLocalObj = true;
2808                                 $found = true;
2809                         }
2810                 }
2811
2812                 # Variables
2813                 if ( !$found && $args->getLength() == 0 ) {
2814                         $id = $this->mVariables->matchStartToEnd( $part1 );
2815                         if ( $id !== false ) {
2816                                 $text = $this->getVariableValue( $id );
2817                                 if (MagicWord::getCacheTTL($id)>-1)
2818                                         $this->mOutput->mContainsOldMagic = true;
2819                                 $found = true;
2820                         }
2821                 }
2822
2823                 # MSG, MSGNW and RAW
2824                 if ( !$found ) {
2825                         # Check for MSGNW:
2826                         $mwMsgnw = MagicWord::get( 'msgnw' );
2827                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2828                                 $nowiki = true;
2829                         } else {
2830                                 # Remove obsolete MSG:
2831                                 $mwMsg = MagicWord::get( 'msg' );
2832                                 $mwMsg->matchStartAndRemove( $part1 );
2833                         }
2834
2835                         # Check for RAW:
2836                         $mwRaw = MagicWord::get( 'raw' );
2837                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2838                                 $forceRawInterwiki = true;
2839                         }
2840                 }
2841                 wfProfileOut( __METHOD__.'-modifiers' );
2842
2843                 # Parser functions
2844                 if ( !$found ) {
2845                         wfProfileIn( __METHOD__ . '-pfunc' );
2846
2847                         $colonPos = strpos( $part1, ':' );
2848                         if ( $colonPos !== false ) {
2849                                 # Case sensitive functions
2850                                 $function = substr( $part1, 0, $colonPos );
2851                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2852                                         $function = $this->mFunctionSynonyms[1][$function];
2853                                 } else {
2854                                         # Case insensitive functions
2855                                         $function = strtolower( $function );
2856                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2857                                                 $function = $this->mFunctionSynonyms[0][$function];
2858                                         } else {
2859                                                 $function = false;
2860                                         }
2861                                 }
2862                                 if ( $function ) {
2863                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2864                                         $initialArgs = array( &$this );
2865                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2866                                         if ( $flags & SFH_OBJECT_ARGS ) {
2867                                                 # Add a frame parameter, and pass the arguments as an array
2868                                                 $allArgs = $initialArgs;
2869                                                 $allArgs[] = $frame;
2870                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2871                                                         $funcArgs[] = $args->item( $i );
2872                                                 }
2873                                                 $allArgs[] = $funcArgs;
2874                                         } else {
2875                                                 # Convert arguments to plain text
2876                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2877                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2878                                                 }
2879                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2880                                         }
2881
2882                                         # Workaround for PHP bug 35229 and similar
2883                                         if ( !is_callable( $callback ) ) {
2884                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2885                                         }
2886                                         $result = call_user_func_array( $callback, $allArgs );
2887                                         $found = true;
2888                                         $noparse = true;
2889                                         $preprocessFlags = 0;
2890
2891                                         if ( is_array( $result ) ) {
2892                                                 if ( isset( $result[0] ) ) {
2893                                                         $text = $result[0];
2894                                                         unset( $result[0] );
2895                                                 }
2896
2897                                                 // Extract flags into the local scope
2898                                                 // This allows callers to set flags such as nowiki, found, etc.
2899                                                 extract( $result );
2900                                         } else {
2901                                                 $text = $result;
2902                                         }
2903                                         if ( !$noparse ) {
2904                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2905                                                 $isChildObj = true;
2906                                         }
2907                                 }
2908                         }
2909                         wfProfileOut( __METHOD__ . '-pfunc' );
2910                 }
2911
2912                 # Finish mangling title and then check for loops.
2913                 # Set $title to a Title object and $titleText to the PDBK
2914                 if ( !$found ) {
2915                         $ns = NS_TEMPLATE;
2916                         # Split the title into page and subpage
2917                         $subpage = '';
2918                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2919                         if ($subpage !== '') {
2920                                 $ns = $this->mTitle->getNamespace();
2921                         }
2922                         $title = Title::newFromText( $part1, $ns );
2923                         if ( $title ) {
2924                                 $titleText = $title->getPrefixedText();
2925                                 # Check for language variants if the template is not found
2926                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
2927                                         $wgContLang->findVariantLink( $part1, $title, true );
2928                                 }
2929                                 # Do infinite loop check
2930                                 if ( !$frame->loopCheck( $title ) ) {
2931                                         $found = true;
2932                                         $text = "<span class=\"error\">Template loop detected: [[$titleText]]</span>";
2933                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
2934                                 }
2935                                 # Do recursion depth check
2936                                 $limit = $this->mOptions->getMaxTemplateDepth();
2937                                 if ( $frame->depth >= $limit ) {
2938                                         $found = true;
2939                                         $text = "<span class=\"error\">Template recursion depth limit exceeded ($limit)</span>";
2940                                 }
2941                         }
2942                 }
2943
2944                 # Load from database
2945                 if ( !$found && $title ) {
2946                         wfProfileIn( __METHOD__ . '-loadtpl' );
2947                         if ( !$title->isExternal() ) {
2948                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
2949                                         $text = SpecialPage::capturePath( $title );
2950                                         if ( is_string( $text ) ) {
2951                                                 $found = true;
2952                                                 $isHTML = true;
2953                                                 $this->disableCache();
2954                                         }
2955                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
2956                                         $found = false; //access denied
2957                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
2958                                 } else {
2959                                         list( $text, $title ) = $this->getTemplateDom( $title );
2960                                         if ( $text !== false ) {
2961                                                 $found = true;
2962                                                 $isChildObj = true;
2963                                         }
2964                                 }
2965
2966                                 # If the title is valid but undisplayable, make a link to it
2967                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
2968                                         $text = "[[:$titleText]]";
2969                                         $found = true;
2970                                 }
2971                         } elseif ( $title->isTrans() ) {
2972                                 // Interwiki transclusion
2973                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
2974                                         $text = $this->interwikiTransclude( $title, 'render' );
2975                                         $isHTML = true;
2976                                 } else {
2977                                         $text = $this->interwikiTransclude( $title, 'raw' );
2978                                         // Preprocess it like a template
2979                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
2980                                         $isChildObj = true;
2981                                 }
2982                                 $found = true;
2983                         }
2984                         wfProfileOut( __METHOD__ . '-loadtpl' );
2985                 }
2986
2987                 # If we haven't found text to substitute by now, we're done
2988                 # Recover the source wikitext and return it
2989                 if ( !$found ) {
2990                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2991                         wfProfileOut( __METHOD__ );
2992                         return array( 'object' => $text );
2993                 }
2994
2995                 # Expand DOM-style return values in a child frame
2996                 if ( $isChildObj ) {
2997                         # Clean up argument array
2998                         $newFrame = $frame->newChild( $args, $title );
2999
3000                         if ( $nowiki ) {
3001                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3002                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3003                                 # Expansion is eligible for the empty-frame cache
3004                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3005                                         $text = $this->mTplExpandCache[$titleText];
3006                                 } else {
3007                                         $text = $newFrame->expand( $text );
3008                                         $this->mTplExpandCache[$titleText] = $text;
3009                                 }
3010                         } else {
3011                                 # Uncached expansion
3012                                 $text = $newFrame->expand( $text );
3013                         }
3014                 }
3015                 if ( $isLocalObj && $nowiki ) {
3016                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3017                         $isLocalObj = false;
3018                 }
3019
3020                 # Replace raw HTML by a placeholder
3021                 # Add a blank line preceding, to prevent it from mucking up
3022                 # immediately preceding headings
3023                 if ( $isHTML ) {
3024                         $text = "\n\n" . $this->insertStripItem( $text );
3025                 }
3026                 # Escape nowiki-style return values
3027                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3028                         $text = wfEscapeWikiText( $text );
3029                 }
3030                 # Bug 529: if the template begins with a table or block-level
3031                 # element, it should be treated as beginning a new line.
3032                 # This behaviour is somewhat controversial.
3033                 elseif ( is_string( $text ) && !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3034                         $text = "\n" . $text;
3035                 }
3036
3037                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3038                         # Error, oversize inclusion
3039                         $text = "[[$originalTitle]]" .
3040                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3041                         $this->limitationWarn( 'post-expand-template-inclusion' );
3042                 }
3043
3044                 if ( $isLocalObj ) {
3045                         $ret = array( 'object' => $text );
3046                 } else {
3047                         $ret = array( 'text' => $text );
3048                 }
3049
3050                 wfProfileOut( __METHOD__ );
3051                 return $ret;
3052         }
3053
3054         /**
3055          * Get the semi-parsed DOM representation of a template with a given title,
3056          * and its redirect destination title. Cached.
3057          */
3058         function getTemplateDom( $title ) {
3059                 $cacheTitle = $title;
3060                 $titleText = $title->getPrefixedDBkey();
3061
3062                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3063                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3064                         $title = Title::makeTitle( $ns, $dbk );
3065                         $titleText = $title->getPrefixedDBkey();
3066                 }
3067                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3068                         return array( $this->mTplDomCache[$titleText], $title );
3069                 }
3070
3071                 // Cache miss, go to the database
3072                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3073
3074                 if ( $text === false ) {
3075                         $this->mTplDomCache[$titleText] = false;
3076                         return array( false, $title );
3077                 }
3078
3079                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3080                 $this->mTplDomCache[ $titleText ] = $dom;
3081
3082                 if (! $title->equals($cacheTitle)) {
3083                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3084                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3085                 }
3086
3087                 return array( $dom, $title );
3088         }
3089
3090         /**
3091          * Fetch the unparsed text of a template and register a reference to it.
3092          */
3093         function fetchTemplateAndTitle( $title ) {
3094                 $templateCb = $this->mOptions->getTemplateCallback();
3095                 $stuff = call_user_func( $templateCb, $title, $this );
3096                 $text = $stuff['text'];
3097                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3098                 if ( isset( $stuff['deps'] ) ) {
3099                         foreach ( $stuff['deps'] as $dep ) {
3100                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3101                         }
3102                 }
3103                 return array($text,$finalTitle);
3104         }
3105
3106         function fetchTemplate( $title ) {
3107                 $rv = $this->fetchTemplateAndTitle($title);
3108                 return $rv[0];
3109         }
3110
3111         /**
3112          * Static function to get a template
3113          * Can be overridden via ParserOptions::setTemplateCallback().
3114          */
3115         static function statelessFetchTemplate( $title, $parser=false ) {
3116                 $text = $skip = false;
3117                 $finalTitle = $title;
3118                 $deps = array();
3119
3120                 // Loop to fetch the article, with up to 1 redirect
3121                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3122                         # Give extensions a chance to select the revision instead
3123                         $id = false; // Assume current
3124                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3125
3126                         if( $skip ) {
3127                                 $text = false;
3128                                 $deps[] = array(
3129                                         'title' => $title,
3130                                         'page_id' => $title->getArticleID(),
3131                                         'rev_id' => null );
3132                                 break;
3133                         }
3134                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3135                         $rev_id = $rev ? $rev->getId() : 0;
3136                         // If there is no current revision, there is no page
3137                         if( $id === false && !$rev ) {
3138                                 $linkCache = LinkCache::singleton();
3139                                 $linkCache->addBadLinkObj( $title );
3140                         }
3141
3142                         $deps[] = array(
3143                                 'title' => $title,
3144                                 'page_id' => $title->getArticleID(),
3145                                 'rev_id' => $rev_id );
3146
3147                         if( $rev ) {
3148                                 $text = $rev->getText();
3149                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3150                                 global $wgLang;
3151                                 $message = $wgLang->lcfirst( $title->getText() );
3152                                 $text = wfMsgForContentNoTrans( $message );
3153                                 if( wfEmptyMsg( $message, $text ) ) {
3154                                         $text = false;
3155                                         break;
3156                                 }
3157                         } else {
3158                                 break;
3159                         }
3160                         if ( $text === false ) {
3161                                 break;
3162                         }
3163                         // Redirect?
3164                         $finalTitle = $title;
3165                         $title = Title::newFromRedirect( $text );
3166                 }
3167                 return array(
3168                         'text' => $text,
3169                         'finalTitle' => $finalTitle,
3170                         'deps' => $deps );
3171         }
3172
3173         /**
3174          * Transclude an interwiki link.
3175          */
3176         function interwikiTransclude( $title, $action ) {
3177                 global $wgEnableScaryTranscluding;
3178
3179                 if (!$wgEnableScaryTranscluding)
3180                         return wfMsg('scarytranscludedisabled');
3181
3182                 $url = $title->getFullUrl( "action=$action" );
3183
3184                 if (strlen($url) > 255)
3185                         return wfMsg('scarytranscludetoolong');
3186                 return $this->fetchScaryTemplateMaybeFromCache($url);
3187         }
3188
3189         function fetchScaryTemplateMaybeFromCache($url) {
3190                 global $wgTranscludeCacheExpiry;
3191                 $dbr = wfGetDB(DB_SLAVE);
3192                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3193                                 array('tc_url' => $url));
3194                 if ($obj) {
3195                         $time = $obj->tc_time;
3196                         $text = $obj->tc_contents;
3197                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3198                                 return $text;
3199                         }
3200                 }
3201
3202                 $text = Http::get($url);
3203                 if (!$text)
3204                         return wfMsg('scarytranscludefailed', $url);
3205
3206                 $dbw = wfGetDB(DB_MASTER);
3207                 $dbw->replace('transcache', array('tc_url'), array(
3208                         'tc_url' => $url,
3209                         'tc_time' => time(),
3210                         'tc_contents' => $text));
3211                 return $text;
3212         }
3213
3214
3215         /**
3216          * Triple brace replacement -- used for template arguments
3217          * @private
3218          */
3219         function argSubstitution( $piece, $frame ) {
3220                 wfProfileIn( __METHOD__ );
3221
3222                 $error = false;
3223                 $parts = $piece['parts'];
3224                 $nameWithSpaces = $frame->expand( $piece['title'] );
3225                 $argName = trim( $nameWithSpaces );
3226                 $object = false;
3227                 $text = $frame->getArgument( $argName );
3228                 if (  $text === false && $parts->getLength() > 0
3229                   && (
3230                     $this->ot['html']
3231                     || $this->ot['pre']
3232                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3233                   )
3234                 ) {
3235                         # No match in frame, use the supplied default
3236                         $object = $parts->item( 0 )->getChildren();
3237                 }
3238                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3239                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3240                         $this->limitationWarn( 'post-expand-template-argument' );
3241                 }
3242
3243                 if ( $text === false && $object === false ) {
3244                         # No match anywhere
3245                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3246                 }
3247                 if ( $error !== false ) {
3248                         $text .= $error;
3249                 }
3250                 if ( $object !== false ) {
3251                         $ret = array( 'object' => $object );
3252                 } else {
3253                         $ret = array( 'text' => $text );
3254                 }
3255
3256                 wfProfileOut( __METHOD__ );
3257                 return $ret;
3258         }
3259
3260         /**
3261          * Return the text to be used for a given extension tag.
3262          * This is the ghost of strip().
3263          *
3264          * @param array $params Associative array of parameters:
3265          *     name       PPNode for the tag name
3266          *     attr       PPNode for unparsed text where tag attributes are thought to be
3267          *     attributes Optional associative array of parsed attributes
3268          *     inner      Contents of extension element
3269          *     noClose    Original text did not have a close tag
3270          * @param PPFrame $frame
3271          */
3272         function extensionSubstitution( $params, $frame ) {
3273                 global $wgRawHtml, $wgContLang;
3274
3275                 $name = $frame->expand( $params['name'] );
3276                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3277                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3278
3279                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $this->mMarkerIndex++) . self::MARKER_SUFFIX;
3280
3281                 if ( $this->ot['html'] ) {
3282                         $name = strtolower( $name );
3283
3284                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3285                         if ( isset( $params['attributes'] ) ) {
3286                                 $attributes = $attributes + $params['attributes'];
3287                         }
3288                         switch ( $name ) {
3289                                 case 'html':
3290                                         if( $wgRawHtml ) {
3291                                                 $output = $content;
3292                                                 break;
3293                                         } else {
3294                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3295                                         }
3296                                 case 'nowiki':
3297                                         $output = Xml::escapeTagsOnly( $content );
3298                                         break;
3299                                 case 'math':
3300                                         $output = $wgContLang->armourMath(
3301                                                 MathRenderer::renderMath( $content, $attributes ) );
3302                                         break;
3303                                 case 'gallery':
3304                                         $output = $this->renderImageGallery( $content, $attributes );
3305                                         break;
3306                                 default:
3307                                         if( isset( $this->mTagHooks[$name] ) ) {
3308                                                 # Workaround for PHP bug 35229 and similar
3309                                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3310                                                         throw new MWException( "Tag hook for $name is not callable\n" );
3311                                                 }
3312                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3313                                                         array( $content, $attributes, $this ) );
3314                                         } else {
3315                                                 $output = '<span class="error">Invalid tag extension name: ' .
3316                                                         htmlspecialchars( $name ) . '</span>';
3317                                         }
3318                         }
3319                 } else {
3320                         if ( is_null( $attrText ) ) {
3321                                 $attrText = '';
3322                         }
3323                         if ( isset( $params['attributes'] ) ) {
3324                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3325                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3326                                                 htmlspecialchars( $attrValue ) . '"';
3327                                 }
3328                         }
3329                         if ( $content === null ) {
3330                                 $output = "<$name$attrText/>";
3331                         } else {
3332                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3333                                 $output = "<$name$attrText>$content$close";
3334                         }
3335                 }
3336
3337                 if ( $name === 'html' || $name === 'nowiki' ) {
3338                         $this->mStripState->nowiki->setPair( $marker, $output );
3339                 } else {
3340                         $this->mStripState->general->setPair( $marker, $output );
3341                 }
3342                 return $marker;
3343         }
3344
3345         /**
3346          * Increment an include size counter
3347          *
3348          * @param string $type The type of expansion
3349          * @param integer $size The size of the text
3350          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3351          */
3352         function incrementIncludeSize( $type, $size ) {
3353                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3354                         return false;
3355                 } else {
3356                         $this->mIncludeSizes[$type] += $size;
3357                         return true;
3358                 }
3359         }
3360
3361         /**
3362          * Increment the expensive function count
3363          *
3364          * @return boolean False if the limit has been exceeded
3365          */
3366         function incrementExpensiveFunctionCount() {
3367                 global $wgExpensiveParserFunctionLimit;
3368                 $this->mExpensiveFunctionCount++;
3369                 if($this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit) {
3370                         return true;
3371                 }
3372                 return false;
3373         }
3374
3375         /**
3376          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3377          * Fills $this->mDoubleUnderscores, returns the modified text
3378          */
3379         function doDoubleUnderscore( $text ) {
3380                 // The position of __TOC__ needs to be recorded
3381                 $mw = MagicWord::get( 'toc' );
3382                 if( $mw->match( $text ) ) {
3383                         $this->mShowToc = true;
3384                         $this->mForceTocPosition = true;
3385
3386                         // Set a placeholder. At the end we'll fill it in with the TOC.
3387                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3388
3389                         // Only keep the first one.
3390                         $text = $mw->replace( '', $text );
3391                 }
3392
3393                 // Now match and remove the rest of them
3394                 $mwa = MagicWord::getDoubleUnderscoreArray();
3395                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3396
3397                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3398                         $this->mOutput->mNoGallery = true;
3399                 }
3400                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3401                         $this->mShowToc = false;
3402                 }
3403                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3404                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3405
3406                         $containerCategory = Title::makeTitleSafe( NS_CATEGORY, wfMsgForContent( 'hidden-category-category' ) );
3407                         if ( $containerCategory ) {
3408                                 $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3409                         } else {
3410                                 wfDebug( __METHOD__.": [[MediaWiki:hidden-category-category]] is not a valid title!\n" );
3411                         }
3412                 }
3413                 # (bug 8068) Allow control over whether robots index a page.
3414                 #
3415                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3416                 # is not desirable, the last one on the page should win.
3417                 if( isset( $this->mDoubleUnderscores['noindex'] ) ) {
3418                         $this->mOutput->setIndexPolicy( 'noindex' );
3419                 } elseif( isset( $this->mDoubleUnderscores['index'] ) ) {
3420                         $this->mOutput->setIndexPolicy( 'index' );
3421                 }
3422
3423                 return $text;
3424         }
3425
3426         /**
3427          * This function accomplishes several tasks:
3428          * 1) Auto-number headings if that option is enabled
3429          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3430          * 3) Add a Table of contents on the top for users who have enabled the option
3431          * 4) Auto-anchor headings
3432          *
3433          * It loops through all headlines, collects the necessary data, then splits up the
3434          * string and re-inserts the newly formatted headlines.
3435          *
3436          * @param string $text
3437          * @param boolean $isMain
3438          * @private
3439          */
3440         function formatHeadings( $text, $isMain=true ) {
3441                 global $wgMaxTocLevel, $wgContLang;
3442
3443                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3444                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3445                         $showEditLink = 0;
3446                 } else {
3447                         $showEditLink = $this->mOptions->getEditSection();
3448                 }
3449
3450                 # Inhibit editsection links if requested in the page
3451                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
3452                         $showEditLink = 0;
3453                 }
3454
3455                 # Get all headlines for numbering them and adding funky stuff like [edit]
3456                 # links - this is for later, but we need the number of headlines right now
3457                 $matches = array();
3458                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3459
3460                 # if there are fewer than 4 headlines in the article, do not show TOC
3461                 # unless it's been explicitly enabled.
3462                 $enoughToc = $this->mShowToc &&
3463                         (($numMatches >= 4) || $this->mForceTocPosition);
3464
3465                 # Allow user to stipulate that a page should have a "new section"
3466                 # link added via __NEWSECTIONLINK__
3467                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3468                         $this->mOutput->setNewSection( true );
3469                 }
3470
3471                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3472                 # override above conditions and always show TOC above first header
3473                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3474                         $this->mShowToc = true;
3475                         $enoughToc = true;
3476                 }
3477
3478                 # We need this to perform operations on the HTML
3479                 $sk = $this->mOptions->getSkin();
3480
3481                 # headline counter
3482                 $headlineCount = 0;
3483                 $numVisible = 0;
3484
3485                 # Ugh .. the TOC should have neat indentation levels which can be
3486                 # passed to the skin functions. These are determined here
3487                 $toc = '';
3488                 $full = '';
3489                 $head = array();
3490                 $sublevelCount = array();
3491                 $levelCount = array();
3492                 $toclevel = 0;
3493                 $level = 0;
3494                 $prevlevel = 0;
3495                 $toclevel = 0;
3496                 $prevtoclevel = 0;
3497                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3498                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3499                 $tocraw = array();
3500
3501                 foreach( $matches[3] as $headline ) {
3502                         $isTemplate = false;
3503                         $titleText = false;
3504                         $sectionIndex = false;
3505                         $numbering = '';
3506                         $markerMatches = array();
3507                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3508                                 $serial = $markerMatches[1];
3509                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3510                                 $isTemplate = ($titleText != $baseTitleText);
3511                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3512                         }
3513
3514                         if( $toclevel ) {
3515                                 $prevlevel = $level;
3516                                 $prevtoclevel = $toclevel;
3517                         }
3518                         $level = $matches[1][$headlineCount];
3519
3520                         if( $doNumberHeadings || $enoughToc ) {
3521
3522                                 if ( $level > $prevlevel ) {
3523                                         # Increase TOC level
3524                                         $toclevel++;
3525                                         $sublevelCount[$toclevel] = 0;
3526                                         if( $toclevel<$wgMaxTocLevel ) {
3527                                                 $prevtoclevel = $toclevel;
3528                                                 $toc .= $sk->tocIndent();
3529                                                 $numVisible++;
3530                                         }
3531                                 }
3532                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3533                                         # Decrease TOC level, find level to jump to
3534
3535                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3536                                                 # Can only go down to level 1
3537                                                 $toclevel = 1;
3538                                         } else {
3539                                                 for ($i = $toclevel; $i > 0; $i--) {
3540                                                         if ( $levelCount[$i] == $level ) {
3541                                                                 # Found last matching level
3542                                                                 $toclevel = $i;
3543                                                                 break;
3544                                                         }
3545                                                         elseif ( $levelCount[$i] < $level ) {
3546                                                                 # Found first matching level below current level
3547                                                                 $toclevel = $i + 1;
3548                                                                 break;
3549                                                         }
3550                                                 }
3551                                         }
3552                                         if( $toclevel<$wgMaxTocLevel ) {
3553                                                 if($prevtoclevel < $wgMaxTocLevel) {
3554                                                         # Unindent only if the previous toc level was shown :p
3555                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3556                                                         $prevtoclevel = $toclevel;
3557                                                 } else {
3558                                                         $toc .= $sk->tocLineEnd();
3559                                                 }
3560                                         }
3561                                 }
3562                                 else {
3563                                         # No change in level, end TOC line
3564                                         if( $toclevel<$wgMaxTocLevel ) {
3565                                                 $toc .= $sk->tocLineEnd();
3566                                         }
3567                                 }
3568
3569                                 $levelCount[$toclevel] = $level;
3570
3571                                 # count number of headlines for each level
3572                                 @$sublevelCount[$toclevel]++;
3573                                 $dot = 0;
3574                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3575                                         if( !empty( $sublevelCount[$i] ) ) {
3576                                                 if( $dot ) {
3577                                                         $numbering .= '.';
3578                                                 }
3579                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3580                                                 $dot = 1;
3581                                         }
3582                                 }
3583                         }
3584
3585                         # The safe header is a version of the header text safe to use for links
3586                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3587                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3588
3589                         # Remove link placeholders by the link text.
3590                         #     <!--LINK number-->
3591                         # turns into
3592                         #     link text with suffix
3593                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3594
3595                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3596                         $tocline = preg_replace(
3597                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3598                                 array( '',                          '<$1>'),
3599                                 $safeHeadline
3600                         );
3601                         $tocline = trim( $tocline );
3602
3603                         # For the anchor, strip out HTML-y stuff period
3604                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3605                         $safeHeadline = trim( $safeHeadline );
3606
3607                         # Save headline for section edit hint before it's escaped
3608                         $headlineHint = $safeHeadline;
3609                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3610                         # HTML names must be case-insensitively unique (bug 10721)
3611                         $arrayKey = strtolower( $safeHeadline );
3612
3613                         # count how many in assoc. array so we can track dupes in anchors
3614                         isset( $refers[$arrayKey] ) ? $refers[$arrayKey]++ : $refers[$arrayKey] = 1;
3615                         $refcount[$headlineCount] = $refers[$arrayKey];
3616
3617                         # Don't number the heading if it is the only one (looks silly)
3618                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3619                                 # the two are different if the line contains a link
3620                                 $headline=$numbering . ' ' . $headline;
3621                         }
3622
3623                         # Create the anchor for linking from the TOC to the section
3624                         $anchor = $safeHeadline;
3625                         if($refcount[$headlineCount] > 1 ) {
3626                                 $anchor .= '_' . $refcount[$headlineCount];
3627                         }
3628                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3629                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3630                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
3631                         }
3632                         # give headline the correct <h#> tag
3633                         if( $showEditLink && $sectionIndex !== false ) {
3634                                 if( $isTemplate ) {
3635                                         # Put a T flag in the section identifier, to indicate to extractSections()
3636                                         # that sections inside <includeonly> should be counted.
3637                                         $editlink = $sk->doEditSectionLink(Title::newFromText( $titleText ), "T-$sectionIndex");
3638                                 } else {
3639                                         $editlink = $sk->doEditSectionLink($this->mTitle, $sectionIndex, $headlineHint);
3640                                 }
3641                         } else {
3642                                 $editlink = '';
3643                         }
3644                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3645
3646                         $headlineCount++;
3647                 }
3648
3649                 $this->mOutput->setSections( $tocraw );
3650
3651                 # Never ever show TOC if no headers
3652                 if( $numVisible < 1 ) {
3653                         $enoughToc = false;
3654                 }
3655
3656                 if( $enoughToc ) {
3657                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3658                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3659                         }
3660                         $toc = $sk->tocList( $toc );
3661                 }
3662
3663                 # split up and insert constructed headlines
3664
3665                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3666                 $i = 0;
3667
3668                 foreach( $blocks as $block ) {
3669                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3670                                 # This is the [edit] link that appears for the top block of text when
3671                                 # section editing is enabled
3672
3673                                 # Disabled because it broke block formatting
3674                                 # For example, a bullet point in the top line
3675                                 # $full .= $sk->editSectionLink(0);
3676                         }
3677                         $full .= $block;
3678                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3679                                 # Top anchor now in skin
3680                                 $full = $full.$toc;
3681                         }
3682
3683                         if( !empty( $head[$i] ) ) {
3684                                 $full .= $head[$i];
3685                         }
3686                         $i++;
3687                 }
3688                 if( $this->mForceTocPosition ) {
3689                         return str_replace( '<!--MWTOC-->', $toc, $full );
3690                 } else {
3691                         return $full;
3692                 }
3693         }
3694
3695         /**
3696          * Transform wiki markup when saving a page by doing \r\n -> \n
3697          * conversion, substitting signatures, {{subst:}} templates, etc.
3698          *
3699          * @param string $text the text to transform
3700          * @param Title &$title the Title object for the current article
3701          * @param User &$user the User object describing the current user
3702          * @param ParserOptions $options parsing options
3703          * @param bool $clearState whether to clear the parser state first
3704          * @return string the altered wiki markup
3705          * @public
3706          */
3707         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3708                 $this->mOptions = $options;
3709                 $this->setTitle( $title );
3710                 $this->setOutputType( self::OT_WIKI );
3711
3712                 if ( $clearState ) {
3713                         $this->clearState();
3714                 }
3715
3716                 $pairs = array(
3717                         "\r\n" => "\n",
3718                 );
3719                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3720                 $text = $this->pstPass2( $text, $user );
3721                 $text = $this->mStripState->unstripBoth( $text );
3722                 return $text;
3723         }
3724
3725         /**
3726          * Pre-save transform helper function
3727          * @private
3728          */
3729         function pstPass2( $text, $user ) {
3730                 global $wgContLang, $wgLocaltimezone;
3731
3732                 /* Note: This is the timestamp saved as hardcoded wikitext to
3733                  * the database, we use $wgContLang here in order to give
3734                  * everyone the same signature and use the default one rather
3735                  * than the one selected in each user's preferences.
3736                  *
3737                  * (see also bug 12815)
3738                  */
3739                 $ts = $this->mOptions->getTimestamp();
3740                 $tz = wfMsgForContent( 'timezone-utc' );
3741                 if ( isset( $wgLocaltimezone ) ) {
3742                         $unixts = wfTimestamp( TS_UNIX, $ts );
3743                         $oldtz = getenv( 'TZ' );
3744                         putenv( 'TZ='.$wgLocaltimezone );
3745                         $ts = date( 'YmdHis', $unixts );
3746                         $tz = date( 'T', $unixts );  # might vary on DST changeover!
3747                         putenv( 'TZ='.$oldtz );
3748                 }
3749
3750                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tz)";
3751
3752                 # Variable replacement
3753                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3754                 $text = $this->replaceVariables( $text );
3755
3756                 # Signatures
3757                 $sigText = $this->getUserSig( $user );
3758                 $text = strtr( $text, array(
3759                         '~~~~~' => $d,
3760                         '~~~~' => "$sigText $d",
3761                         '~~~' => $sigText
3762                 ) );
3763
3764                 # Context links: [[|name]] and [[name (context)|]]
3765                 #
3766                 global $wgLegalTitleChars;
3767                 $tc = "[$wgLegalTitleChars]";
3768                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
3769
3770                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3771                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
3772                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3773                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3774
3775                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3776                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3777                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
3778                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3779
3780                 $t = $this->mTitle->getText();
3781                 $m = array();
3782                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3783                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3784                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3785                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3786                 } else {
3787                         # if there's no context, don't bother duplicating the title
3788                         $text = preg_replace( $p2, '[[\\1]]', $text );
3789                 }
3790
3791                 # Trim trailing whitespace
3792                 $text = rtrim( $text );
3793
3794                 return $text;
3795         }
3796
3797         /**
3798          * Fetch the user's signature text, if any, and normalize to
3799          * validated, ready-to-insert wikitext.
3800          *
3801          * @param User $user
3802          * @return string
3803          * @private
3804          */
3805         function getUserSig( &$user ) {
3806                 global $wgMaxSigChars;
3807
3808                 $username = $user->getName();
3809                 $nickname = $user->getOption( 'nickname' );
3810                 $nickname = $nickname === '' ? $username : $nickname;
3811
3812                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
3813                         $nickname = $username;
3814                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
3815                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
3816                         # Sig. might contain markup; validate this
3817                         if( $this->validateSig( $nickname ) !== false ) {
3818                                 # Validated; clean up (if needed) and return it
3819                                 return $this->cleanSig( $nickname, true );
3820                         } else {
3821                                 # Failed to validate; fall back to the default
3822                                 $nickname = $username;
3823                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
3824                         }
3825                 }
3826
3827                 // Make sure nickname doesnt get a sig in a sig
3828                 $nickname = $this->cleanSigInSig( $nickname );
3829
3830                 # If we're still here, make it a link to the user page
3831                 $userText = wfEscapeWikiText( $username );
3832                 $nickText = wfEscapeWikiText( $nickname );
3833                 if ( $user->isAnon() )  {
3834                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
3835                 } else {
3836                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
3837                 }
3838         }
3839
3840         /**
3841          * Check that the user's signature contains no bad XML
3842          *
3843          * @param string $text
3844          * @return mixed An expanded string, or false if invalid.
3845          */
3846         function validateSig( $text ) {
3847                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
3848         }
3849
3850         /**
3851          * Clean up signature text
3852          *
3853          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3854          * 2) Substitute all transclusions
3855          *
3856          * @param string $text
3857          * @param $parsing Whether we're cleaning (preferences save) or parsing
3858          * @return string Signature text
3859          */
3860         function cleanSig( $text, $parsing = false ) {
3861                 if ( !$parsing ) {
3862                         global $wgTitle;
3863                         $this->clearState();
3864                         $this->setTitle( $wgTitle );
3865                         $this->mOptions = new ParserOptions;
3866                         $this->setOutputType = self::OT_PREPROCESS;
3867                 }
3868
3869                 # Option to disable this feature
3870                 if ( !$this->mOptions->getCleanSignatures() ) {
3871                         return $text;
3872                 }
3873
3874                 # FIXME: regex doesn't respect extension tags or nowiki
3875                 #  => Move this logic to braceSubstitution()
3876                 $substWord = MagicWord::get( 'subst' );
3877                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3878                 $substText = '{{' . $substWord->getSynonym( 0 );
3879
3880                 $text = preg_replace( $substRegex, $substText, $text );
3881                 $text = $this->cleanSigInSig( $text );
3882                 $dom = $this->preprocessToDom( $text );
3883                 $frame = $this->getPreprocessor()->newFrame();
3884                 $text = $frame->expand( $dom );
3885
3886                 if ( !$parsing ) {
3887                         $text = $this->mStripState->unstripBoth( $text );
3888                 }
3889
3890                 return $text;
3891         }
3892
3893         /**
3894          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3895          * @param string $text
3896          * @return string Signature text with /~{3,5}/ removed
3897          */
3898         function cleanSigInSig( $text ) {
3899                 $text = preg_replace( '/~{3,5}/', '', $text );
3900                 return $text;
3901         }
3902
3903         /**
3904          * Set up some variables which are usually set up in parse()
3905          * so that an external function can call some class members with confidence
3906          * @public
3907          */
3908         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3909                 $this->setTitle( $title );
3910                 $this->mOptions = $options;
3911                 $this->setOutputType( $outputType );
3912                 if ( $clearState ) {
3913                         $this->clearState();
3914                 }
3915         }
3916
3917         /**
3918          * Wrapper for preprocess()
3919          *
3920          * @param string $text the text to preprocess
3921          * @param ParserOptions $options  options
3922          * @return string
3923          * @public
3924          */
3925         function transformMsg( $text, $options ) {
3926                 global $wgTitle;
3927                 static $executing = false;
3928
3929                 # Guard against infinite recursion
3930                 if ( $executing ) {
3931                         return $text;
3932                 }
3933                 $executing = true;
3934
3935                 wfProfileIn(__METHOD__);
3936                 $text = $this->preprocess( $text, $wgTitle, $options );
3937
3938                 $executing = false;
3939                 wfProfileOut(__METHOD__);
3940                 return $text;
3941         }
3942
3943         /**
3944          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3945          * The callback should have the following form:
3946          *    function myParserHook( $text, $params, &$parser ) { ... }
3947          *
3948          * Transform and return $text. Use $parser for any required context, e.g. use
3949          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3950          *
3951          * @public
3952          *
3953          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3954          * @param mixed $callback The callback function (and object) to use for the tag
3955          *
3956          * @return The old value of the mTagHooks array associated with the hook
3957          */
3958         function setHook( $tag, $callback ) {
3959                 $tag = strtolower( $tag );
3960                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3961                 $this->mTagHooks[$tag] = $callback;
3962                 if( !in_array( $tag, $this->mStripList ) ) {
3963                         $this->mStripList[] = $tag;
3964                 }
3965
3966                 return $oldVal;
3967         }
3968
3969         function setTransparentTagHook( $tag, $callback ) {
3970                 $tag = strtolower( $tag );
3971                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
3972                 $this->mTransparentTagHooks[$tag] = $callback;
3973
3974                 return $oldVal;
3975         }
3976
3977         /**
3978          * Remove all tag hooks
3979          */
3980         function clearTagHooks() {
3981                 $this->mTagHooks = array();
3982                 $this->mStripList = $this->mDefaultStripList;
3983         }
3984
3985         /**
3986          * Create a function, e.g. {{sum:1|2|3}}
3987          * The callback function should have the form:
3988          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3989          *
3990          * Or with SFH_OBJECT_ARGS:
3991          *    function myParserFunction( $parser, $frame, $args ) { ... }
3992          *
3993          * The callback may either return the text result of the function, or an array with the text
3994          * in element 0, and a number of flags in the other elements. The names of the flags are
3995          * specified in the keys. Valid flags are:
3996          *   found                     The text returned is valid, stop processing the template. This
3997          *                             is on by default.
3998          *   nowiki                    Wiki markup in the return value should be escaped
3999          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4000          *
4001          * @public
4002          *
4003          * @param string $id The magic word ID
4004          * @param mixed $callback The callback function (and object) to use
4005          * @param integer $flags a combination of the following flags:
4006          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4007          *
4008          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4009          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4010          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4011          *     the arguments, and to control the way they are expanded.
4012          *
4013          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4014          *     arguments, for instance:
4015          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4016          *
4017          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4018          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4019          *     working if/when this is changed.
4020          *
4021          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4022          *     expansion.
4023          *
4024          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4025          *     about the methods available in PPFrame and PPNode.
4026          *
4027          * @return The old callback function for this name, if any
4028          */
4029         function setFunctionHook( $id, $callback, $flags = 0 ) {
4030                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4031                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4032
4033                 # Add to function cache
4034                 $mw = MagicWord::get( $id );
4035                 if( !$mw )
4036                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4037
4038                 $synonyms = $mw->getSynonyms();
4039                 $sensitive = intval( $mw->isCaseSensitive() );
4040
4041                 foreach ( $synonyms as $syn ) {
4042                         # Case
4043                         if ( !$sensitive ) {
4044                                 $syn = strtolower( $syn );
4045                         }
4046                         # Add leading hash
4047                         if ( !( $flags & SFH_NO_HASH ) ) {
4048                                 $syn = '#' . $syn;
4049                         }
4050                         # Remove trailing colon
4051                         if ( substr( $syn, -1, 1 ) === ':' ) {
4052                                 $syn = substr( $syn, 0, -1 );
4053                         }
4054                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4055                 }
4056                 return $oldVal;
4057         }
4058
4059         /**
4060          * Get all registered function hook identifiers
4061          *
4062          * @return array
4063          */
4064         function getFunctionHooks() {
4065                 return array_keys( $this->mFunctionHooks );
4066         }
4067
4068         /**
4069          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4070          * Placeholders created in Skin::makeLinkObj()
4071          * Returns an array of link CSS classes, indexed by PDBK.
4072          */
4073         function replaceLinkHolders( &$text, $options = 0 ) {
4074                 return $this->mLinkHolders->replace( $text );
4075         }
4076
4077         /**
4078          * Replace <!--LINK--> link placeholders with plain text of links
4079          * (not HTML-formatted).
4080          * @param string $text
4081          * @return string
4082          */
4083         function replaceLinkHoldersText( $text ) {
4084                 return $this->mLinkHolders->replaceText( $text );
4085         }
4086
4087         /**
4088          * Tag hook handler for 'pre'.
4089          */
4090         function renderPreTag( $text, $attribs ) {
4091                 // Backwards-compatibility hack
4092                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4093
4094                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4095                 return wfOpenElement( 'pre', $attribs ) .
4096                         Xml::escapeTagsOnly( $content ) .
4097                         '</pre>';
4098         }
4099
4100         /**
4101          * Renders an image gallery from a text with one line per image.
4102          * text labels may be given by using |-style alternative text. E.g.
4103          *   Image:one.jpg|The number "1"
4104          *   Image:tree.jpg|A tree
4105          * given as text will return the HTML of a gallery with two images,
4106          * labeled 'The number "1"' and
4107          * 'A tree'.
4108          */
4109         function renderImageGallery( $text, $params ) {
4110                 $ig = new ImageGallery();
4111                 $ig->setContextTitle( $this->mTitle );
4112                 $ig->setShowBytes( false );
4113                 $ig->setShowFilename( false );
4114                 $ig->setParser( $this );
4115                 $ig->setHideBadImages();
4116                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4117                 $ig->useSkin( $this->mOptions->getSkin() );
4118                 $ig->mRevisionId = $this->mRevisionId;
4119
4120                 if( isset( $params['caption'] ) ) {
4121                         $caption = $params['caption'];
4122                         $caption = htmlspecialchars( $caption );
4123                         $caption = $this->replaceInternalLinks( $caption );
4124                         $ig->setCaptionHtml( $caption );
4125                 }
4126                 if( isset( $params['perrow'] ) ) {
4127                         $ig->setPerRow( $params['perrow'] );
4128                 }
4129                 if( isset( $params['widths'] ) ) {
4130                         $ig->setWidths( $params['widths'] );
4131                 }
4132                 if( isset( $params['heights'] ) ) {
4133                         $ig->setHeights( $params['heights'] );
4134                 }
4135
4136                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4137
4138                 $lines = StringUtils::explode( "\n", $text );
4139                 foreach ( $lines as $line ) {
4140                         # match lines like these:
4141                         # Image:someimage.jpg|This is some image
4142                         $matches = array();
4143                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4144                         # Skip empty lines
4145                         if ( count( $matches ) == 0 ) {
4146                                 continue;
4147                         }
4148
4149                         if ( strpos( $matches[0], '%' ) !== false )
4150                                 $matches[1] = urldecode( $matches[1] );
4151                         $tp = Title::newFromText( $matches[1]/*, NS_IMAGE*/ );
4152                         $nt =& $tp;
4153                         if( is_null( $nt ) ) {
4154                                 # Bogus title. Ignore these so we don't bomb out later.
4155                                 continue;
4156                         }
4157                         if ( isset( $matches[3] ) ) {
4158                                 $label = $matches[3];
4159                         } else {
4160                                 $label = '';
4161                         }
4162
4163                         $html = $this->recursiveTagParse( trim( $label ) );
4164
4165                         $ig->add( $nt, $html );
4166
4167                         # Only add real images (bug #5586)
4168                         if ( $nt->getNamespace() == NS_IMAGE ) {
4169                                 $this->mOutput->addImage( $nt->getDBkey() );
4170                         }
4171                 }
4172                 return $ig->toHTML();
4173         }
4174
4175         function getImageParams( $handler ) {
4176                 if ( $handler ) {
4177                         $handlerClass = get_class( $handler );
4178                 } else {
4179                         $handlerClass = '';
4180                 }
4181                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4182                         // Initialise static lists
4183                         static $internalParamNames = array(
4184                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4185                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4186                                         'bottom', 'text-bottom' ),
4187                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4188                                         'upright', 'border' ),
4189                         );
4190                         static $internalParamMap;
4191                         if ( !$internalParamMap ) {
4192                                 $internalParamMap = array();
4193                                 foreach ( $internalParamNames as $type => $names ) {
4194                                         foreach ( $names as $name ) {
4195                                                 $magicName = str_replace( '-', '_', "img_$name" );
4196                                                 $internalParamMap[$magicName] = array( $type, $name );
4197                                         }
4198                                 }
4199                         }
4200
4201                         // Add handler params
4202                         $paramMap = $internalParamMap;
4203                         if ( $handler ) {
4204                                 $handlerParamMap = $handler->getParamMap();
4205                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4206                                         $paramMap[$magic] = array( 'handler', $paramName );
4207                                 }
4208                         }
4209                         $this->mImageParams[$handlerClass] = $paramMap;
4210                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4211                 }
4212                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4213         }
4214
4215         /**
4216          * Parse image options text and use it to make an image
4217          * @param Title $title
4218          * @param string $options
4219          * @param LinkHolderArray $holders
4220          */
4221         function makeImage( $title, $options, $holders = false ) {
4222                 # Check if the options text is of the form "options|alt text"
4223                 # Options are:
4224                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4225                 #  * left               no resizing, just left align. label is used for alt= only
4226                 #  * right              same, but right aligned
4227                 #  * none               same, but not aligned
4228                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4229                 #  * center             center the image
4230                 #  * framed             Keep original image size, no magnify-button.
4231                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4232                 #  * upright            reduce width for upright images, rounded to full __0 px
4233                 #  * border             draw a 1px border around the image
4234                 # vertical-align values (no % or length right now):
4235                 #  * baseline
4236                 #  * sub
4237                 #  * super
4238                 #  * top
4239                 #  * text-top
4240                 #  * middle
4241                 #  * bottom
4242                 #  * text-bottom
4243
4244                 $parts = StringUtils::explode( "|", $options );
4245                 $sk = $this->mOptions->getSkin();
4246
4247                 # Give extensions a chance to select the file revision for us
4248                 $skip = $time = $descQuery = false;
4249                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4250
4251                 if ( $skip ) {
4252                         return $sk->link( $title );
4253                 }
4254
4255                 # Get parameter map
4256                 $file = wfFindFile( $title, $time );
4257                 $handler = $file ? $file->getHandler() : false;
4258
4259                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4260
4261                 # Process the input parameters
4262                 $caption = '';
4263                 $params = array( 'frame' => array(), 'handler' => array(),
4264                         'horizAlign' => array(), 'vertAlign' => array() );
4265                 foreach( $parts as $part ) {
4266                         $part = trim( $part );
4267                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4268                         $validated = false;
4269                         if( isset( $paramMap[$magicName] ) ) {
4270                                 list( $type, $paramName ) = $paramMap[$magicName];
4271
4272                                 // Special case; width and height come in one variable together
4273                                 if( $type === 'handler' && $paramName === 'width' ) {
4274                                         $m = array();
4275                                         # (bug 13500) In both cases (width/height and width only),
4276                                         # permit trailing "px" for backward compatibility.
4277                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4278                                                 $width = intval( $m[1] );
4279                                                 $height = intval( $m[2] );
4280                                                 if ( $handler->validateParam( 'width', $width ) ) {
4281                                                         $params[$type]['width'] = $width;
4282                                                         $validated = true;
4283                                                 }
4284                                                 if ( $handler->validateParam( 'height', $height ) ) {
4285                                                         $params[$type]['height'] = $height;
4286                                                         $validated = true;
4287                                                 }
4288                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4289                                                 $width = intval( $value );
4290                                                 if ( $handler->validateParam( 'width', $width ) ) {
4291                                                         $params[$type]['width'] = $width;
4292                                                         $validated = true;
4293                                                 }
4294                                         } // else no validation -- bug 13436
4295                                 } else {
4296                                         if ( $type === 'handler' ) {
4297                                                 # Validate handler parameter
4298                                                 $validated = $handler->validateParam( $paramName, $value );
4299                                         } else {
4300                                                 # Validate internal parameters
4301                                                 switch( $paramName ) {
4302                                                 case "manualthumb":
4303                                                         /// @fixme - possibly check validity here?
4304                                                         /// downstream behavior seems odd with missing manual thumbs.
4305                                                         $validated = true;
4306                                                         break;
4307                                                 default:
4308                                                         // Most other things appear to be empty or numeric...
4309                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4310                                                 }
4311                                         }
4312
4313                                         if ( $validated ) {
4314                                                 $params[$type][$paramName] = $value;
4315                                         }
4316                                 }
4317                         }
4318                         if ( !$validated ) {
4319                                 $caption = $part;
4320                         }
4321                 }
4322
4323                 # Process alignment parameters
4324                 if ( $params['horizAlign'] ) {
4325                         $params['frame']['align'] = key( $params['horizAlign'] );
4326                 }
4327                 if ( $params['vertAlign'] ) {
4328                         $params['frame']['valign'] = key( $params['vertAlign'] );
4329                 }
4330
4331                 # Strip bad stuff out of the alt text
4332                 # We can't just use replaceLinkHoldersText() here, because if this function
4333                 # is called from replaceInternalLinks2(), mLinkHolders won't be up to date.
4334                 if ( $holders ) {
4335                         $alt = $holders->replaceText( $caption );
4336                 } else {
4337                         $alt = $this->replaceLinkHoldersText( $caption );
4338                 }
4339
4340                 # make sure there are no placeholders in thumbnail attributes
4341                 # that are later expanded to html- so expand them now and
4342                 # remove the tags
4343                 $alt = $this->mStripState->unstripBoth( $alt );
4344                 $alt = Sanitizer::stripAllTags( $alt );
4345
4346                 $params['frame']['alt'] = $alt;
4347                 $params['frame']['caption'] = $caption;
4348
4349                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4350
4351                 # Linker does the rest
4352                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4353
4354                 # Give the handler a chance to modify the parser object
4355                 if ( $handler ) {
4356                         $handler->parserTransformHook( $this, $file );
4357                 }
4358
4359                 return $ret;
4360         }
4361
4362         /**
4363          * Set a flag in the output object indicating that the content is dynamic and
4364          * shouldn't be cached.
4365          */
4366         function disableCache() {
4367                 wfDebug( "Parser output marked as uncacheable.\n" );
4368                 $this->mOutput->mCacheTime = -1;
4369         }
4370
4371         /**#@+
4372          * Callback from the Sanitizer for expanding items found in HTML attribute
4373          * values, so they can be safely tested and escaped.
4374          * @param string $text
4375          * @param PPFrame $frame
4376          * @return string
4377          * @private
4378          */
4379         function attributeStripCallback( &$text, $frame = false ) {
4380                 $text = $this->replaceVariables( $text, $frame );
4381                 $text = $this->mStripState->unstripBoth( $text );
4382                 return $text;
4383         }
4384
4385         /**#@-*/
4386
4387         /**#@+
4388          * Accessor/mutator
4389          */
4390         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4391         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4392         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4393         /**#@-*/
4394
4395         /**#@+
4396          * Accessor
4397          */
4398         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4399         /**#@-*/
4400
4401
4402         /**
4403          * Break wikitext input into sections, and either pull or replace
4404          * some particular section's text.
4405          *
4406          * External callers should use the getSection and replaceSection methods.
4407          *
4408          * @param string $text Page wikitext
4409          * @param string $section A section identifier string of the form:
4410          *   <flag1> - <flag2> - ... - <section number>
4411          *
4412          * Currently the only recognised flag is "T", which means the target section number
4413          * was derived during a template inclusion parse, in other words this is a template
4414          * section edit link. If no flags are given, it was an ordinary section edit link.
4415          * This flag is required to avoid a section numbering mismatch when a section is
4416          * enclosed by <includeonly> (bug 6563).
4417          *
4418          * The section number 0 pulls the text before the first heading; other numbers will
4419          * pull the given section along with its lower-level subsections. If the section is
4420          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4421          *
4422          * @param string $mode One of "get" or "replace"
4423          * @param string $newText Replacement text for section data.
4424          * @return string for "get", the extracted section text.
4425          *                for "replace", the whole page with the section replaced.
4426          */
4427         private function extractSections( $text, $section, $mode, $newText='' ) {
4428                 global $wgTitle;
4429                 $this->clearState();
4430                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
4431                 $this->mOptions = new ParserOptions;
4432                 $this->setOutputType( self::OT_WIKI );
4433                 $outText = '';
4434                 $frame = $this->getPreprocessor()->newFrame();
4435
4436                 // Process section extraction flags
4437                 $flags = 0;
4438                 $sectionParts = explode( '-', $section );
4439                 $sectionIndex = array_pop( $sectionParts );
4440                 foreach ( $sectionParts as $part ) {
4441                         if ( $part === 'T' ) {
4442                                 $flags |= self::PTD_FOR_INCLUSION;
4443                         }
4444                 }
4445                 // Preprocess the text
4446                 $root = $this->preprocessToDom( $text, $flags );
4447
4448                 // <h> nodes indicate section breaks
4449                 // They can only occur at the top level, so we can find them by iterating the root's children
4450                 $node = $root->getFirstChild();
4451
4452                 // Find the target section
4453                 if ( $sectionIndex == 0 ) {
4454                         // Section zero doesn't nest, level=big
4455                         $targetLevel = 1000;
4456                 } else {
4457             while ( $node ) {
4458                 if ( $node->getName() === 'h' ) {
4459                     $bits = $node->splitHeading();
4460                                         if ( $bits['i'] == $sectionIndex ) {
4461                                         $targetLevel = $bits['level'];
4462                                                 break;
4463                                         }
4464                                 }
4465                                 if ( $mode === 'replace' ) {
4466                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4467                                 }
4468                                 $node = $node->getNextSibling();
4469                         }
4470                 }
4471
4472                 if ( !$node ) {
4473                         // Not found
4474                         if ( $mode === 'get' ) {
4475                                 return $newText;
4476                         } else {
4477                                 return $text;
4478                         }
4479                 }
4480
4481                 // Find the end of the section, including nested sections
4482                 do {
4483                         if ( $node->getName() === 'h' ) {
4484                                 $bits = $node->splitHeading();
4485                                 $curLevel = $bits['level'];
4486                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4487                                         break;
4488                                 }
4489                         }
4490                         if ( $mode === 'get' ) {
4491                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4492                         }
4493                         $node = $node->getNextSibling();
4494                 } while ( $node );
4495
4496                 // Write out the remainder (in replace mode only)
4497                 if ( $mode === 'replace' ) {
4498                         // Output the replacement text
4499                         // Add two newlines on -- trailing whitespace in $newText is conventionally
4500                         // stripped by the editor, so we need both newlines to restore the paragraph gap
4501                         $outText .= $newText . "\n\n";
4502                         while ( $node ) {
4503                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4504                                 $node = $node->getNextSibling();
4505                         }
4506                 }
4507
4508                 if ( is_string( $outText ) ) {
4509                         // Re-insert stripped tags
4510                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4511                 }
4512
4513                 return $outText;
4514         }
4515
4516         /**
4517          * This function returns the text of a section, specified by a number ($section).
4518          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4519          * the first section before any such heading (section 0).
4520          *
4521          * If a section contains subsections, these are also returned.
4522          *
4523          * @param string $text text to look in
4524          * @param string $section section identifier
4525          * @param string $deftext default to return if section is not found
4526          * @return string text of the requested section
4527          */
4528         public function getSection( $text, $section, $deftext='' ) {
4529                 return $this->extractSections( $text, $section, "get", $deftext );
4530         }
4531
4532         public function replaceSection( $oldtext, $section, $text ) {
4533                 return $this->extractSections( $oldtext, $section, "replace", $text );
4534         }
4535
4536         /**
4537          * Get the timestamp associated with the current revision, adjusted for
4538          * the default server-local timestamp
4539          */
4540         function getRevisionTimestamp() {
4541                 if ( is_null( $this->mRevisionTimestamp ) ) {
4542                         wfProfileIn( __METHOD__ );
4543                         global $wgContLang;
4544                         $dbr = wfGetDB( DB_SLAVE );
4545                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4546                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4547
4548                         // Normalize timestamp to internal MW format for timezone processing.
4549                         // This has the added side-effect of replacing a null value with
4550                         // the current time, which gives us more sensible behavior for
4551                         // previews.
4552                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4553
4554                         // The cryptic '' timezone parameter tells to use the site-default
4555                         // timezone offset instead of the user settings.
4556                         //
4557                         // Since this value will be saved into the parser cache, served
4558                         // to other users, and potentially even used inside links and such,
4559                         // it needs to be consistent for all visitors.
4560                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4561
4562                         wfProfileOut( __METHOD__ );
4563                 }
4564                 return $this->mRevisionTimestamp;
4565         }
4566
4567         /**
4568          * Mutator for $mDefaultSort
4569          *
4570          * @param $sort New value
4571          */
4572         public function setDefaultSort( $sort ) {
4573                 $this->mDefaultSort = $sort;
4574         }
4575
4576         /**
4577          * Accessor for $mDefaultSort
4578          * Will use the title/prefixed title if none is set
4579          *
4580          * @return string
4581          */
4582         public function getDefaultSort() {
4583                 global $wgCategoryPrefixedDefaultSortkey;
4584                 if( $this->mDefaultSort !== false ) {
4585                         return $this->mDefaultSort;
4586                 } elseif ($this->mTitle->getNamespace() == NS_CATEGORY ||
4587                         !$wgCategoryPrefixedDefaultSortkey) {
4588                         return $this->mTitle->getText();
4589                 } else {
4590                         return $this->mTitle->getPrefixedText();
4591                 }
4592         }
4593
4594         /**
4595          * Try to guess the section anchor name based on a wikitext fragment
4596          * presumably extracted from a heading, for example "Header" from
4597          * "== Header ==".
4598          */
4599         public function guessSectionNameFromWikiText( $text ) {
4600                 # Strip out wikitext links(they break the anchor)
4601                 $text = $this->stripSectionName( $text );
4602                 $headline = Sanitizer::decodeCharReferences( $text );
4603                 # strip out HTML
4604                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
4605                 $headline = trim( $headline );
4606                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
4607                 $replacearray = array(
4608                         '%3A' => ':',
4609                         '%' => '.'
4610                 );
4611                 return str_replace(
4612                         array_keys( $replacearray ),
4613                         array_values( $replacearray ),
4614                         $sectionanchor );
4615         }
4616
4617         /**
4618          * Strips a text string of wikitext for use in a section anchor
4619          *
4620          * Accepts a text string and then removes all wikitext from the
4621          * string and leaves only the resultant text (i.e. the result of
4622          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
4623          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
4624          * to create valid section anchors by mimicing the output of the
4625          * parser when headings are parsed.
4626          *
4627          * @param $text string Text string to be stripped of wikitext
4628          * for use in a Section anchor
4629          * @return Filtered text string
4630          */
4631         public function stripSectionName( $text ) {
4632                 # Strip internal link markup
4633                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
4634                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
4635
4636                 # Strip external link markup (FIXME: Not Tolerant to blank link text
4637                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
4638                 # on how many empty links there are on the page - need to figure that out.
4639                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
4640
4641                 # Parse wikitext quotes (italics & bold)
4642                 $text = $this->doQuotes($text);
4643
4644                 # Strip HTML tags
4645                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
4646                 return $text;
4647         }
4648
4649         function srvus( $text ) {
4650                 return $this->testSrvus( $text, $this->mOutputType );
4651         }
4652
4653         /**
4654          * strip/replaceVariables/unstrip for preprocessor regression testing
4655          */
4656         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
4657                 $this->clearState();
4658                 if ( ! ( $title instanceof Title ) ) {
4659                         $title = Title::newFromText( $title );
4660                 }
4661                 $this->mTitle = $title;
4662                 $this->mOptions = $options;
4663                 $this->setOutputType( $outputType );
4664                 $text = $this->replaceVariables( $text );
4665                 $text = $this->mStripState->unstripBoth( $text );
4666                 $text = Sanitizer::removeHTMLtags( $text );
4667                 return $text;
4668         }
4669
4670         function testPst( $text, $title, $options ) {
4671                 global $wgUser;
4672                 if ( ! ( $title instanceof Title ) ) {
4673                         $title = Title::newFromText( $title );
4674                 }
4675                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
4676         }
4677
4678         function testPreprocess( $text, $title, $options ) {
4679                 if ( ! ( $title instanceof Title ) ) {
4680                         $title = Title::newFromText( $title );
4681                 }
4682                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
4683         }
4684
4685         function markerSkipCallback( $s, $callback ) {
4686                 $i = 0;
4687                 $out = '';
4688                 while ( $i < strlen( $s ) ) {
4689                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
4690                         if ( $markerStart === false ) {
4691                                 $out .= call_user_func( $callback, substr( $s, $i ) );
4692                                 break;
4693                         } else {
4694                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
4695                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
4696                                 if ( $markerEnd === false ) {
4697                                         $out .= substr( $s, $markerStart );
4698                                         break;
4699                                 } else {
4700                                         $markerEnd += strlen( self::MARKER_SUFFIX );
4701                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
4702                                         $i = $markerEnd;
4703                                 }
4704                         }
4705                 }
4706                 return $out;
4707         }
4708 }
4709
4710 /**
4711  * @todo document, briefly.
4712  * @ingroup Parser
4713  */
4714 class StripState {
4715         var $general, $nowiki;
4716
4717         function __construct() {
4718                 $this->general = new ReplacementArray;
4719                 $this->nowiki = new ReplacementArray;
4720         }
4721
4722         function unstripGeneral( $text ) {
4723                 wfProfileIn( __METHOD__ );
4724                 do {
4725                         $oldText = $text;
4726                         $text = $this->general->replace( $text );
4727                 } while ( $text !== $oldText );
4728                 wfProfileOut( __METHOD__ );
4729                 return $text;
4730         }
4731
4732         function unstripNoWiki( $text ) {
4733                 wfProfileIn( __METHOD__ );
4734                 do {
4735                         $oldText = $text;
4736                         $text = $this->nowiki->replace( $text );
4737                 } while ( $text !== $oldText );
4738                 wfProfileOut( __METHOD__ );
4739                 return $text;
4740         }
4741
4742         function unstripBoth( $text ) {
4743                 wfProfileIn( __METHOD__ );
4744                 do {
4745                         $oldText = $text;
4746                         $text = $this->general->replace( $text );
4747                         $text = $this->nowiki->replace( $text );
4748                 } while ( $text !== $oldText );
4749                 wfProfileOut( __METHOD__ );
4750                 return $text;
4751         }
4752 }
4753
4754 /**
4755  * @todo document, briefly.
4756  * @ingroup Parser
4757  */
4758 class OnlyIncludeReplacer {
4759         var $output = '';
4760
4761         function replace( $matches ) {
4762                 if ( substr( $matches[1], -1 ) === "\n" ) {
4763                         $this->output .= substr( $matches[1], 0, -1 );
4764                 } else {
4765                         $this->output .= $matches[1];
4766                 }
4767         }
4768 }