includes/parser/Parser.php

   1 <?php
   2 /**
   3  * PHP parser that converts wiki markup to HTML.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Parser
  22  */
  23
  24 /**
  25  * @defgroup Parser Parser
  26  */
  27
  28 /**
  29  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  30  * syntax, such as "[[link]]" for making links), and provides a one-way
  31  * transformation of that wiki markup it into XHTML output / markup
  32  * (which in turn the browser understands, and can display).
  33  *
  34  * There are seven main entry points into the Parser class:
  35  *
  36  * - Parser::parse()
  37  *     produces HTML output
  38  * - Parser::preSaveTransform().
  39  *     produces altered wiki markup.
  40  * - Parser::preprocess()
  41  *     removes HTML comments and expands templates
  42  * - Parser::cleanSig() and Parser::cleanSigInSig()
  43  *     Cleans a signature before saving it to preferences
  44  * - Parser::getSection()
  45  *     Return the content of a section from an article for section editing
  46  * - Parser::replaceSection()
  47  *     Replaces a section by number inside an article
  48  * - Parser::getPreloadText()
  49  *     Removes <noinclude> sections, and <includeonly> tags.
  50  *
  51  * Globals used:
  52  *    object: $wgContLang
  53  *
  54  * @warning $wgUser or $wgTitle or $wgRequest or $wgLang. Keep them away!
  55  *
  56  * @par Settings:
  57  * $wgLocaltimezone
  58  * $wgNamespacesWithSubpages
  59  *
  60  * @par Settings only within ParserOptions:
  61  * $wgAllowExternalImages
  62  * $wgAllowSpecialInclusion
  63  * $wgInterwikiMagic
  64  * $wgMaxArticleSize
  65  *
  66  * @ingroup Parser
  67  */
  68 class Parser {
  69         /**
  70          * Update this version number when the ParserOutput format
  71          * changes in an incompatible way, so the parser cache
  72          * can automatically discard old data.
  73          */
  74         const VERSION = '1.6.4';
  75
  76         /**
  77          * Update this version number when the output of serialiseHalfParsedText()
  78          * changes in an incompatible way
  79          */
  80         const HALF_PARSED_VERSION = 2;
  81
  82         # Flags for Parser::setFunctionHook
  83         # Also available as global constants from Defines.php
  84         const SFH_NO_HASH = 1;
  85         const SFH_OBJECT_ARGS = 2;
  86
  87         # Constants needed for external link processing
  88         # Everything except bracket, space, or control characters
  89         # \p{Zs} is unicode 'separator, space' category. It covers the space 0x20
  90         # as well as U+3000 is IDEOGRAPHIC SPACE for bug 19052
  91         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F\p{Zs}]';
  92         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F\p{Zs}]+)
  93                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sxu';
  94
  95         # State constants for the definition list colon extraction
  96         const COLON_STATE_TEXT = 0;
  97         const COLON_STATE_TAG = 1;
  98         const COLON_STATE_TAGSTART = 2;
  99         const COLON_STATE_CLOSETAG = 3;
 100         const COLON_STATE_TAGSLASH = 4;
 101         const COLON_STATE_COMMENT = 5;
 102         const COLON_STATE_COMMENTDASH = 6;
 103         const COLON_STATE_COMMENTDASHDASH = 7;
 104
 105         # Flags for preprocessToDom
 106         const PTD_FOR_INCLUSION = 1;
 107
 108         # Allowed values for $this->mOutputType
 109         # Parameter to startExternalParse().
 110         const OT_HTML = 1; # like parse()
 111         const OT_WIKI = 2; # like preSaveTransform()
 112         const OT_PREPROCESS = 3; # like preprocess()
 113         const OT_MSG = 3;
 114         const OT_PLAIN = 4; # like extractSections() - portions of the original are returned unchanged.
 115
 116         # Marker Suffix needs to be accessible staticly.
 117         const MARKER_SUFFIX = "-QINU\x7f";
 118
 119         # Persistent:
 120         var $mTagHooks = array();
 121         var $mTransparentTagHooks = array();
 122         var $mFunctionHooks = array();
 123         var $mFunctionSynonyms = array( 0 => array(), 1 => array() );
 124         var $mFunctionTagHooks = array();
 125         var $mStripList = array();
 126         var $mDefaultStripList = array();
 127         var $mVarCache = array();
 128         var $mImageParams = array();
 129         var $mImageParamsMagicArray = array();
 130         var $mMarkerIndex = 0;
 131         var $mFirstCall = true;
 132
 133         # Initialised by initialiseVariables()
 134
 135         /**
 136          * @var MagicWordArray
 137          */
 138         var $mVariables;
 139
 140         /**
 141          * @var MagicWordArray
 142          */
 143         var $mSubstWords;
 144         var $mConf, $mPreprocessor, $mExtLinkBracketedRegex, $mUrlProtocols; # Initialised in constructor
 145
 146         # Cleared with clearState():
 147         /**
 148          * @var ParserOutput
 149          */
 150         var $mOutput;
 151         var $mAutonumber, $mDTopen;
 152
 153         /**
 154          * @var StripState
 155          */
 156         var $mStripState;
 157
 158         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 159         /**
 160          * @var LinkHolderArray
 161          */
 162         var $mLinkHolders;
 163
 164         var $mLinkID;
 165         var $mIncludeSizes, $mPPNodeCount, $mGeneratedPPNodeCount, $mHighestExpansionDepth;
 166         var $mDefaultSort;
 167         var $mTplExpandCache; # empty-frame expansion cache
 168         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 169         var $mExpensiveFunctionCount; # number of expensive parser function calls
 170         var $mShowToc, $mForceTocPosition;
 171
 172         /**
 173          * @var User
 174          */
 175         var $mUser; # User object; only used when doing pre-save transform
 176
 177         # Temporary
 178         # These are variables reset at least once per parse regardless of $clearState
 179
 180         /**
 181          * @var ParserOptions
 182          */
 183         var $mOptions;
 184
 185         /**
 186          * @var Title
 187          */
 188         var $mTitle;        # Title context, used for self-link rendering and similar things
 189         var $mOutputType;   # Output type, one of the OT_xxx constants
 190         var $ot;            # Shortcut alias, see setOutputType()
 191         var $mRevisionObject; # The revision object of the specified revision ID
 192         var $mRevisionId;   # ID to display in {{REVISIONID}} tags
 193         var $mRevisionTimestamp; # The timestamp of the specified revision ID
 194         var $mRevisionUser; # User to display in {{REVISIONUSER}} tag
 195         var $mRevIdForTs;   # The revision ID which was used to fetch the timestamp
 196
 197         /**
 198          * @var string
 199          */
 200         var $mUniqPrefix;
 201
 202         /**
 203          * @var Array with the language name of each language link (i.e. the
 204          * interwiki prefix) in the key, value arbitrary. Used to avoid sending
 205          * duplicate language links to the ParserOutput.
 206          */
 207         var $mLangLinkLanguages;
 208
 209         /**
 210          * Constructor
 211          *
 212          * @param $conf array
 213          */
 214         public function __construct( $conf = array() ) {
 215                 $this->mConf = $conf;
 216                 $this->mUrlProtocols = wfUrlProtocols();
 217                 $this->mExtLinkBracketedRegex = '/\[(((?i)' . $this->mUrlProtocols . ')' .
 218                         self::EXT_LINK_URL_CLASS . '+)\p{Zs}*([^\]\\x00-\\x08\\x0a-\\x1F]*?)\]/Su';
 219                 if ( isset( $conf['preprocessorClass'] ) ) {
 220                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 221                 } elseif ( defined( 'MW_COMPILED' ) ) {
 222                         # Preprocessor_Hash is much faster than Preprocessor_DOM in compiled mode
 223                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 224                 } elseif ( extension_loaded( 'domxml' ) ) {
 225                         # PECL extension that conflicts with the core DOM extension (bug 13770)
 226                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 227                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 228                 } elseif ( extension_loaded( 'dom' ) ) {
 229                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 230                 } else {
 231                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 232                 }
 233                 wfDebug( __CLASS__ . ": using preprocessor: {$this->mPreprocessorClass}\n" );
 234         }
 235
 236         /**
 237          * Reduce memory usage to reduce the impact of circular references
 238          */
 239         function __destruct() {
 240                 if ( isset( $this->mLinkHolders ) ) {
 241                         unset( $this->mLinkHolders );
 242                 }
 243                 foreach ( $this as $name => $value ) {
 244                         unset( $this->$name );
 245                 }
 246         }
 247
 248         /**
 249          * Allow extensions to clean up when the parser is cloned
 250          */
 251         function __clone() {
 252                 wfRunHooks( 'ParserCloned', array( $this ) );
 253         }
 254
 255         /**
 256          * Do various kinds of initialisation on the first call of the parser
 257          */
 258         function firstCallInit() {
 259                 if ( !$this->mFirstCall ) {
 260                         return;
 261                 }
 262                 $this->mFirstCall = false;
 263
 264                 wfProfileIn( __METHOD__ );
 265
 266                 CoreParserFunctions::register( $this );
 267                 CoreTagHooks::register( $this );
 268                 $this->initialiseVariables();
 269
 270                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 271                 wfProfileOut( __METHOD__ );
 272         }
 273
 274         /**
 275          * Clear Parser state
 276          *
 277          * @private
 278          */
 279         function clearState() {
 280                 wfProfileIn( __METHOD__ );
 281                 if ( $this->mFirstCall ) {
 282                         $this->firstCallInit();
 283                 }
 284                 $this->mOutput = new ParserOutput;
 285                 $this->mOptions->registerWatcher( array( $this->mOutput, 'recordOption' ) );
 286                 $this->mAutonumber = 0;
 287                 $this->mLastSection = '';
 288                 $this->mDTopen = false;
 289                 $this->mIncludeCount = array();
 290                 $this->mArgStack = false;
 291                 $this->mInPre = false;
 292                 $this->mLinkHolders = new LinkHolderArray( $this );
 293                 $this->mLinkID = 0;
 294                 $this->mRevisionObject = $this->mRevisionTimestamp =
 295                         $this->mRevisionId = $this->mRevisionUser = null;
 296                 $this->mVarCache = array();
 297                 $this->mUser = null;
 298                 $this->mLangLinkLanguages = array();
 299
 300                 /**
 301                  * Prefix for temporary replacement strings for the multipass parser.
 302                  * \x07 should never appear in input as it's disallowed in XML.
 303                  * Using it at the front also gives us a little extra robustness
 304                  * since it shouldn't match when butted up against identifier-like
 305                  * string constructs.
 306                  *
 307                  * Must not consist of all title characters, or else it will change
 308                  * the behavior of <nowiki> in a link.
 309                  */
 310                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 311                 $this->mStripState = new StripState( $this->mUniqPrefix );
 312
 313                 # Clear these on every parse, bug 4549
 314                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 315
 316                 $this->mShowToc = true;
 317                 $this->mForceTocPosition = false;
 318                 $this->mIncludeSizes = array(
 319                         'post-expand' => 0,
 320                         'arg' => 0,
 321                 );
 322                 $this->mPPNodeCount = 0;
 323                 $this->mGeneratedPPNodeCount = 0;
 324                 $this->mHighestExpansionDepth = 0;
 325                 $this->mDefaultSort = false;
 326                 $this->mHeadings = array();
 327                 $this->mDoubleUnderscores = array();
 328                 $this->mExpensiveFunctionCount = 0;
 329
 330                 # Fix cloning
 331                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 332                         $this->mPreprocessor = null;
 333                 }
 334
 335                 wfRunHooks( 'ParserClearState', array( &$this ) );
 336                 wfProfileOut( __METHOD__ );
 337         }
 338
 339         /**
 340          * Convert wikitext to HTML
 341          * Do not call this function recursively.
 342          *
 343          * @param string $text text we want to parse
 344          * @param $title Title object
 345          * @param $options ParserOptions
 346          * @param $linestart boolean
 347          * @param $clearState boolean
 348          * @param int $revid number to pass in {{REVISIONID}}
 349          * @return ParserOutput a ParserOutput
 350          */
 351         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 352                 /**
 353                  * First pass--just handle <nowiki> sections, pass the rest off
 354                  * to internalParse() which does all the real work.
 355                  */
 356
 357                 global $wgUseTidy, $wgAlwaysUseTidy;
 358                 $fname = __METHOD__ . '-' . wfGetCaller();
 359                 wfProfileIn( __METHOD__ );
 360                 wfProfileIn( $fname );
 361
 362                 $this->startParse( $title, $options, self::OT_HTML, $clearState );
 363
 364                 # Remove the strip marker tag prefix from the input, if present.
 365                 if ( $clearState ) {
 366                         $text = str_replace( $this->mUniqPrefix, '', $text );
 367                 }
 368
 369                 $oldRevisionId = $this->mRevisionId;
 370                 $oldRevisionObject = $this->mRevisionObject;
 371                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 372                 $oldRevisionUser = $this->mRevisionUser;
 373                 if ( $revid !== null ) {
 374                         $this->mRevisionId = $revid;
 375                         $this->mRevisionObject = null;
 376                         $this->mRevisionTimestamp = null;
 377                         $this->mRevisionUser = null;
 378                 }
 379
 380                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 381                 # No more strip!
 382                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 383                 $text = $this->internalParse( $text );
 384                 wfRunHooks( 'ParserAfterParse', array( &$this, &$text, &$this->mStripState ) );
 385
 386                 $text = $this->mStripState->unstripGeneral( $text );
 387
 388                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 389                 $fixtags = array(
 390                         # french spaces, last one Guillemet-left
 391                         # only if there is something before the space
 392                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&#160;',
 393                         # french spaces, Guillemet-right
 394                         '/(\\302\\253) /' => '\\1&#160;',
 395                         '/&#160;(!\s*important)/' => ' \\1', # Beware of CSS magic word !important, bug #11874.
 396                 );
 397                 $text = preg_replace( array_keys( $fixtags ), array_values( $fixtags ), $text );
 398
 399                 $text = $this->doBlockLevels( $text, $linestart );
 400
 401                 $this->replaceLinkHolders( $text );
 402
 403                 /**
 404                  * The input doesn't get language converted if
 405                  * a) It's disabled
 406                  * b) Content isn't converted
 407                  * c) It's a conversion table
 408                  * d) it is an interface message (which is in the user language)
 409                  */
 410                 if ( !( $options->getDisableContentConversion()
 411                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] ) ) )
 412                 {
 413                         if ( !$this->mOptions->getInterfaceMessage() ) {
 414                                 # The position of the convert() call should not be changed. it
 415                                 # assumes that the links are all replaced and the only thing left
 416                                 # is the <nowiki> mark.
 417                                 $text = $this->getConverterLanguage()->convert( $text );
 418                         }
 419                 }
 420
 421                 /**
 422                  * A converted title will be provided in the output object if title and
 423                  * content conversion are enabled, the article text does not contain
 424                  * a conversion-suppressing double-underscore tag, and no
 425                  * {{DISPLAYTITLE:...}} is present. DISPLAYTITLE takes precedence over
 426                  * automatic link conversion.
 427                  */
 428                 if ( !( $options->getDisableTitleConversion()
 429                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 430                                 || isset( $this->mDoubleUnderscores['notitleconvert'] )
 431                                 || $this->mOutput->getDisplayTitle() !== false ) )
 432                 {
 433                         $convruletitle = $this->getConverterLanguage()->getConvRuleTitle();
 434                         if ( $convruletitle ) {
 435                                 $this->mOutput->setTitleText( $convruletitle );
 436                         } else {
 437                                 $titleText = $this->getConverterLanguage()->convertTitle( $title );
 438                                 $this->mOutput->setTitleText( $titleText );
 439                         }
 440                 }
 441
 442                 $text = $this->mStripState->unstripNoWiki( $text );
 443
 444                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 445
 446                 $text = $this->replaceTransparentTags( $text );
 447                 $text = $this->mStripState->unstripGeneral( $text );
 448
 449                 $text = Sanitizer::normalizeCharReferences( $text );
 450
 451                 if ( ( $wgUseTidy && $this->mOptions->getTidy() ) || $wgAlwaysUseTidy ) {
 452                         $text = MWTidy::tidy( $text );
 453                 } else {
 454                         # attempt to sanitize at least some nesting problems
 455                         # (bug #2702 and quite a few others)
 456                         $tidyregs = array(
 457                                 # ''Something [http://www.cool.com cool''] -->
 458                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 459                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 460                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 461                                 # fix up an anchor inside another anchor, only
 462                                 # at least for a single single nested link (bug 3695)
 463                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 464                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 465                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 466                                 # contains a div, so fix it up here; replace
 467                                 # div with escaped text
 468                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 469                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 470                                 # remove empty italic or bold tag pairs, some
 471                                 # introduced by rules above
 472                                 '/<([bi])><\/\\1>/' => '',
 473                         );
 474
 475                         $text = preg_replace(
 476                                 array_keys( $tidyregs ),
 477                                 array_values( $tidyregs ),
 478                                 $text );
 479                 }
 480
 481                 if ( $this->mExpensiveFunctionCount > $this->mOptions->getExpensiveParserFunctionLimit() ) {
 482                         $this->limitationWarn( 'expensive-parserfunction',
 483                                 $this->mExpensiveFunctionCount,
 484                                 $this->mOptions->getExpensiveParserFunctionLimit()
 485                         );
 486                 }
 487
 488                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 489
 490                 # Information on include size limits, for the benefit of users who try to skirt them
 491                 if ( $this->mOptions->getEnableLimitReport() ) {
 492                         $max = $this->mOptions->getMaxIncludeSize();
 493                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/{$this->mOptions->getExpensiveParserFunctionLimit()}\n";
 494                         $limitReport =
 495                                 "NewPP limit report\n" .
 496                                 "Preprocessor visited node count: {$this->mPPNodeCount}/{$this->mOptions->getMaxPPNodeCount()}\n" .
 497                                 "Preprocessor generated node count: " .
 498                                         "{$this->mGeneratedPPNodeCount}/{$this->mOptions->getMaxGeneratedPPNodeCount()}\n" .
 499                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 500                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n" .
 501                                 "Highest expansion depth: {$this->mHighestExpansionDepth}/{$this->mOptions->getMaxPPExpandDepth()}\n" .
 502                                 $PFreport;
 503                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 504
 505                         // Sanitize for comment. Note '‐' in the replacement is U+2010,
 506                         // which looks much like the problematic '-'.
 507                         $limitReport = str_replace( array( '-', '&' ), array( '‐', '&amp;' ), $limitReport );
 508
 509                         $text .= "\n<!-- \n$limitReport-->\n";
 510
 511                         if ( $this->mGeneratedPPNodeCount > $this->mOptions->getMaxGeneratedPPNodeCount() / 10 ) {
 512                                 wfDebugLog( 'generated-pp-node-count', $this->mGeneratedPPNodeCount . ' ' .
 513                                         $this->mTitle->getPrefixedDBkey() );
 514                         }
 515                 }
 516                 $this->mOutput->setText( $text );
 517
 518                 $this->mRevisionId = $oldRevisionId;
 519                 $this->mRevisionObject = $oldRevisionObject;
 520                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 521                 $this->mRevisionUser = $oldRevisionUser;
 522                 wfProfileOut( $fname );
 523                 wfProfileOut( __METHOD__ );
 524
 525                 return $this->mOutput;
 526         }
 527
 528         /**
 529          * Recursive parser entry point that can be called from an extension tag
 530          * hook.
 531          *
 532          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 533          *
 534          * @param string $text text extension wants to have parsed
 535          * @param $frame PPFrame: The frame to use for expanding any template variables
 536          *
 537          * @return string
 538          */
 539         function recursiveTagParse( $text, $frame = false ) {
 540                 wfProfileIn( __METHOD__ );
 541                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 542                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 543                 $text = $this->internalParse( $text, false, $frame );
 544                 wfProfileOut( __METHOD__ );
 545                 return $text;
 546         }
 547
 548         /**
 549          * Expand templates and variables in the text, producing valid, static wikitext.
 550          * Also removes comments.
 551          * @return mixed|string
 552          */
 553         function preprocess( $text, Title $title = null, ParserOptions $options, $revid = null ) {
 554                 wfProfileIn( __METHOD__ );
 555                 $this->startParse( $title, $options, self::OT_PREPROCESS, true );
 556                 if ( $revid !== null ) {
 557                         $this->mRevisionId = $revid;
 558                 }
 559                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 560                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 561                 $text = $this->replaceVariables( $text );
 562                 $text = $this->mStripState->unstripBoth( $text );
 563                 wfProfileOut( __METHOD__ );
 564                 return $text;
 565         }
 566
 567         /**
 568          * Recursive parser entry point that can be called from an extension tag
 569          * hook.
 570          *
 571          * @param string $text text to be expanded
 572          * @param $frame PPFrame: The frame to use for expanding any template variables
 573          * @return String
 574          * @since 1.19
 575          */
 576         public function recursivePreprocess( $text, $frame = false ) {
 577                 wfProfileIn( __METHOD__ );
 578                 $text = $this->replaceVariables( $text, $frame );
 579                 $text = $this->mStripState->unstripBoth( $text );
 580                 wfProfileOut( __METHOD__ );
 581                 return $text;
 582         }
 583
 584         /**
 585          * Process the wikitext for the "?preload=" feature. (bug 5210)
 586          *
 587          * "<noinclude>", "<includeonly>" etc. are parsed as for template
 588          * transclusion, comments, templates, arguments, tags hooks and parser
 589          * functions are untouched.
 590          *
 591          * @param $text String
 592          * @param $title Title
 593          * @param $options ParserOptions
 594          * @return String
 595          */
 596         public function getPreloadText( $text, Title $title, ParserOptions $options ) {
 597                 # Parser (re)initialisation
 598                 $this->startParse( $title, $options, self::OT_PLAIN, true );
 599
 600                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 601                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
 602                 $text = $this->getPreprocessor()->newFrame()->expand( $dom, $flags );
 603                 $text = $this->mStripState->unstripBoth( $text );
 604                 return $text;
 605         }
 606
 607         /**
 608          * Get a random string
 609          *
 610          * @return string
 611          */
 612         public static function getRandomString() {
 613                 return wfRandomString( 16 );
 614         }
 615
 616         /**
 617          * Set the current user.
 618          * Should only be used when doing pre-save transform.
 619          *
 620          * @param $user Mixed: User object or null (to reset)
 621          */
 622         function setUser( $user ) {
 623                 $this->mUser = $user;
 624         }
 625
 626         /**
 627          * Accessor for mUniqPrefix.
 628          *
 629          * @return String
 630          */
 631         public function uniqPrefix() {
 632                 if ( !isset( $this->mUniqPrefix ) ) {
 633                         # @todo FIXME: This is probably *horribly wrong*
 634                         # LanguageConverter seems to want $wgParser's uniqPrefix, however
 635                         # if this is called for a parser cache hit, the parser may not
 636                         # have ever been initialized in the first place.
 637                         # Not really sure what the heck is supposed to be going on here.
 638                         return '';
 639                         # throw new MWException( "Accessing uninitialized mUniqPrefix" );
 640                 }
 641                 return $this->mUniqPrefix;
 642         }
 643
 644         /**
 645          * Set the context title
 646          *
 647          * @param $t Title
 648          */
 649         function setTitle( $t ) {
 650                 if ( !$t || $t instanceof FakeTitle ) {
 651                         $t = Title::newFromText( 'NO TITLE' );
 652                 }
 653
 654                 if ( strval( $t->getFragment() ) !== '' ) {
 655                         # Strip the fragment to avoid various odd effects
 656                         $this->mTitle = clone $t;
 657                         $this->mTitle->setFragment( '' );
 658                 } else {
 659                         $this->mTitle = $t;
 660                 }
 661         }
 662
 663         /**
 664          * Accessor for the Title object
 665          *
 666          * @return Title object
 667          */
 668         function getTitle() {
 669                 return $this->mTitle;
 670         }
 671
 672         /**
 673          * Accessor/mutator for the Title object
 674          *
 675          * @param $x Title object or null to just get the current one
 676          * @return Title object
 677          */
 678         function Title( $x = null ) {
 679                 return wfSetVar( $this->mTitle, $x );
 680         }
 681
 682         /**
 683          * Set the output type
 684          *
 685          * @param $ot Integer: new value
 686          */
 687         function setOutputType( $ot ) {
 688                 $this->mOutputType = $ot;
 689                 # Shortcut alias
 690                 $this->ot = array(
 691                         'html' => $ot == self::OT_HTML,
 692                         'wiki' => $ot == self::OT_WIKI,
 693                         'pre' => $ot == self::OT_PREPROCESS,
 694                         'plain' => $ot == self::OT_PLAIN,
 695                 );
 696         }
 697
 698         /**
 699          * Accessor/mutator for the output type
 700          *
 701          * @param int|null $x New value or null to just get the current one
 702          * @return Integer
 703          */
 704         function OutputType( $x = null ) {
 705                 return wfSetVar( $this->mOutputType, $x );
 706         }
 707
 708         /**
 709          * Get the ParserOutput object
 710          *
 711          * @return ParserOutput object
 712          */
 713         function getOutput() {
 714                 return $this->mOutput;
 715         }
 716
 717         /**
 718          * Get the ParserOptions object
 719          *
 720          * @return ParserOptions object
 721          */
 722         function getOptions() {
 723                 return $this->mOptions;
 724         }
 725
 726         /**
 727          * Accessor/mutator for the ParserOptions object
 728          *
 729          * @param $x ParserOptions New value or null to just get the current one
 730          * @return ParserOptions Current ParserOptions object
 731          */
 732         function Options( $x = null ) {
 733                 return wfSetVar( $this->mOptions, $x );
 734         }
 735
 736         /**
 737          * @return int
 738          */
 739         function nextLinkID() {
 740                 return $this->mLinkID++;
 741         }
 742
 743         /**
 744          * @param $id int
 745          */
 746         function setLinkID( $id ) {
 747                 $this->mLinkID = $id;
 748         }
 749
 750         /**
 751          * Get a language object for use in parser functions such as {{FORMATNUM:}}
 752          * @return Language
 753          */
 754         function getFunctionLang() {
 755                 return $this->getTargetLanguage();
 756         }
 757
 758         /**
 759          * Get the target language for the content being parsed. This is usually the
 760          * language that the content is in.
 761          *
 762          * @since 1.19
 763          *
 764          * @throws MWException
 765          * @return Language|null
 766          */
 767         public function getTargetLanguage() {
 768                 $target = $this->mOptions->getTargetLanguage();
 769
 770                 if ( $target !== null ) {
 771                         return $target;
 772                 } elseif( $this->mOptions->getInterfaceMessage() ) {
 773                         return $this->mOptions->getUserLangObj();
 774                 } elseif( is_null( $this->mTitle ) ) {
 775                         throw new MWException( __METHOD__ . ': $this->mTitle is null' );
 776                 }
 777
 778                 return $this->mTitle->getPageLanguage();
 779         }
 780
 781         /**
 782          * Get the language object for language conversion
 783          */
 784         function getConverterLanguage() {
 785                 return $this->getTargetLanguage();
 786         }
 787
 788         /**
 789          * Get a User object either from $this->mUser, if set, or from the
 790          * ParserOptions object otherwise
 791          *
 792          * @return User object
 793          */
 794         function getUser() {
 795                 if ( !is_null( $this->mUser ) ) {
 796                         return $this->mUser;
 797                 }
 798                 return $this->mOptions->getUser();
 799         }
 800
 801         /**
 802          * Get a preprocessor object
 803          *
 804          * @return Preprocessor instance
 805          */
 806         function getPreprocessor() {
 807                 if ( !isset( $this->mPreprocessor ) ) {
 808                         $class = $this->mPreprocessorClass;
 809                         $this->mPreprocessor = new $class( $this );
 810                 }
 811                 return $this->mPreprocessor;
 812         }
 813
 814         /**
 815          * Replaces all occurrences of HTML-style comments and the given tags
 816          * in the text with a random marker and returns the next text. The output
 817          * parameter $matches will be an associative array filled with data in
 818          * the form:
 819          *
 820          * @code
 821          *   'UNIQ-xxxxx' => array(
 822          *     'element',
 823          *     'tag content',
 824          *     array( 'param' => 'x' ),
 825          *     '<element param="x">tag content</element>' ) )
 826          * @endcode
 827          *
 828          * @param array $elements list of element names. Comments are always extracted.
 829          * @param string $text Source text string.
 830          * @param array $matches Out parameter, Array: extracted tags
 831          * @param $uniq_prefix string
 832          * @return String: stripped text
 833          */
 834         public static function extractTagsAndParams( $elements, $text, &$matches, $uniq_prefix = '' ) {
 835                 static $n = 1;
 836                 $stripped = '';
 837                 $matches = array();
 838
 839                 $taglist = implode( '|', $elements );
 840                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 841
 842                 while ( $text != '' ) {
 843                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 844                         $stripped .= $p[0];
 845                         if ( count( $p ) < 5 ) {
 846                                 break;
 847                         }
 848                         if ( count( $p ) > 5 ) {
 849                                 # comment
 850                                 $element = $p[4];
 851                                 $attributes = '';
 852                                 $close = '';
 853                                 $inside = $p[5];
 854                         } else {
 855                                 # tag
 856                                 $element = $p[1];
 857                                 $attributes = $p[2];
 858                                 $close = $p[3];
 859                                 $inside = $p[4];
 860                         }
 861
 862                         $marker = "$uniq_prefix-$element-" . sprintf( '%08X', $n++ ) . self::MARKER_SUFFIX;
 863                         $stripped .= $marker;
 864
 865                         if ( $close === '/>' ) {
 866                                 # Empty element tag, <tag />
 867                                 $content = null;
 868                                 $text = $inside;
 869                                 $tail = null;
 870                         } else {
 871                                 if ( $element === '!--' ) {
 872                                         $end = '/(-->)/';
 873                                 } else {
 874                                         $end = "/(<\\/$element\\s*>)/i";
 875                                 }
 876                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 877                                 $content = $q[0];
 878                                 if ( count( $q ) < 3 ) {
 879                                         # No end tag -- let it run out to the end of the text.
 880                                         $tail = '';
 881                                         $text = '';
 882                                 } else {
 883                                         $tail = $q[1];
 884                                         $text = $q[2];
 885                                 }
 886                         }
 887
 888                         $matches[$marker] = array( $element,
 889                                 $content,
 890                                 Sanitizer::decodeTagAttributes( $attributes ),
 891                                 "<$element$attributes$close$content$tail" );
 892                 }
 893                 return $stripped;
 894         }
 895
 896         /**
 897          * Get a list of strippable XML-like elements
 898          *
 899          * @return array
 900          */
 901         function getStripList() {
 902                 return $this->mStripList;
 903         }
 904
 905         /**
 906          * Add an item to the strip state
 907          * Returns the unique tag which must be inserted into the stripped text
 908          * The tag will be replaced with the original text in unstrip()
 909          *
 910          * @param $text string
 911          *
 912          * @return string
 913          */
 914         function insertStripItem( $text ) {
 915                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 916                 $this->mMarkerIndex++;
 917                 $this->mStripState->addGeneral( $rnd, $text );
 918                 return $rnd;
 919         }
 920
 921         /**
 922          * parse the wiki syntax used to render tables
 923          *
 924          * @private
 925          * @return string
 926          */
 927         function doTableStuff( $text ) {
 928                 wfProfileIn( __METHOD__ );
 929
 930                 $lines = StringUtils::explode( "\n", $text );
 931                 $out = '';
 932                 $td_history = array(); # Is currently a td tag open?
 933                 $last_tag_history = array(); # Save history of last lag activated (td, th or caption)
 934                 $tr_history = array(); # Is currently a tr tag open?
 935                 $tr_attributes = array(); # history of tr attributes
 936                 $has_opened_tr = array(); # Did this table open a <tr> element?
 937                 $indent_level = 0; # indent level of the table
 938
 939                 foreach ( $lines as $outLine ) {
 940                         $line = trim( $outLine );
 941
 942                         if ( $line === '' ) { # empty line, go to next line
 943                                 $out .= $outLine . "\n";
 944                                 continue;
 945                         }
 946
 947                         $first_character = $line[0];
 948                         $matches = array();
 949
 950                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line, $matches ) ) {
 951                                 # First check if we are starting a new table
 952                                 $indent_level = strlen( $matches[1] );
 953
 954                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 955                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'table' );
 956
 957                                 $outLine = str_repeat( '<dl><dd>', $indent_level ) . "<table{$attributes}>";
 958                                 array_push( $td_history, false );
 959                                 array_push( $last_tag_history, '' );
 960                                 array_push( $tr_history, false );
 961                                 array_push( $tr_attributes, '' );
 962                                 array_push( $has_opened_tr, false );
 963                         } elseif ( count( $td_history ) == 0 ) {
 964                                 # Don't do any of the following
 965                                 $out .= $outLine . "\n";
 966                                 continue;
 967                         } elseif ( substr( $line, 0, 2 ) === '|}' ) {
 968                                 # We are ending a table
 969                                 $line = '</table>' . substr( $line, 2 );
 970                                 $last_tag = array_pop( $last_tag_history );
 971
 972                                 if ( !array_pop( $has_opened_tr ) ) {
 973                                         $line = "<tr><td></td></tr>{$line}";
 974                                 }
 975
 976                                 if ( array_pop( $tr_history ) ) {
 977                                         $line = "</tr>{$line}";
 978                                 }
 979
 980                                 if ( array_pop( $td_history ) ) {
 981                                         $line = "</{$last_tag}>{$line}";
 982                                 }
 983                                 array_pop( $tr_attributes );
 984                                 $outLine = $line . str_repeat( '</dd></dl>', $indent_level );
 985                         } elseif ( substr( $line, 0, 2 ) === '|-' ) {
 986                                 # Now we have a table row
 987                                 $line = preg_replace( '#^\|-+#', '', $line );
 988
 989                                 # Whats after the tag is now only attributes
 990                                 $attributes = $this->mStripState->unstripBoth( $line );
 991                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
 992                                 array_pop( $tr_attributes );
 993                                 array_push( $tr_attributes, $attributes );
 994
 995                                 $line = '';
 996                                 $last_tag = array_pop( $last_tag_history );
 997                                 array_pop( $has_opened_tr );
 998                                 array_push( $has_opened_tr, true );
 999
1000                                 if ( array_pop( $tr_history ) ) {
1001                                         $line = '</tr>';
1002                                 }
1003
1004                                 if ( array_pop( $td_history ) ) {
1005                                         $line = "</{$last_tag}>{$line}";
1006                                 }
1007
1008                                 $outLine = $line;
1009                                 array_push( $tr_history, false );
1010                                 array_push( $td_history, false );
1011                                 array_push( $last_tag_history, '' );
1012                         } elseif ( $first_character === '|' || $first_character === '!' || substr( $line, 0, 2 ) === '|+' ) {
1013                                 # This might be cell elements, td, th or captions
1014                                 if ( substr( $line, 0, 2 ) === '|+' ) {
1015                                         $first_character = '+';
1016                                         $line = substr( $line, 1 );
1017                                 }
1018
1019                                 $line = substr( $line, 1 );
1020
1021                                 if ( $first_character === '!' ) {
1022                                         $line = str_replace( '!!', '||', $line );
1023                                 }
1024
1025                                 # Split up multiple cells on the same line.
1026                                 # FIXME : This can result in improper nesting of tags processed
1027                                 # by earlier parser steps, but should avoid splitting up eg
1028                                 # attribute values containing literal "||".
1029                                 $cells = StringUtils::explodeMarkup( '||', $line );
1030
1031                                 $outLine = '';
1032
1033                                 # Loop through each table cell
1034                                 foreach ( $cells as $cell ) {
1035                                         $previous = '';
1036                                         if ( $first_character !== '+' ) {
1037                                                 $tr_after = array_pop( $tr_attributes );
1038                                                 if ( !array_pop( $tr_history ) ) {
1039                                                         $previous = "<tr{$tr_after}>\n";
1040                                                 }
1041                                                 array_push( $tr_history, true );
1042                                                 array_push( $tr_attributes, '' );
1043                                                 array_pop( $has_opened_tr );
1044                                                 array_push( $has_opened_tr, true );
1045                                         }
1046
1047                                         $last_tag = array_pop( $last_tag_history );
1048
1049                                         if ( array_pop( $td_history ) ) {
1050                                                 $previous = "</{$last_tag}>\n{$previous}";
1051                                         }
1052
1053                                         if ( $first_character === '|' ) {
1054                                                 $last_tag = 'td';
1055                                         } elseif ( $first_character === '!' ) {
1056                                                 $last_tag = 'th';
1057                                         } elseif ( $first_character === '+' ) {
1058                                                 $last_tag = 'caption';
1059                                         } else {
1060                                                 $last_tag = '';
1061                                         }
1062
1063                                         array_push( $last_tag_history, $last_tag );
1064
1065                                         # A cell could contain both parameters and data
1066                                         $cell_data = explode( '|', $cell, 2 );
1067
1068                                         # Bug 553: Note that a '|' inside an invalid link should not
1069                                         # be mistaken as delimiting cell parameters
1070                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
1071                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
1072                                         } elseif ( count( $cell_data ) == 1 ) {
1073                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
1074                                         } else {
1075                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
1076                                                 $attributes = Sanitizer::fixTagAttributes( $attributes, $last_tag );
1077                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
1078                                         }
1079
1080                                         $outLine .= $cell;
1081                                         array_push( $td_history, true );
1082                                 }
1083                         }
1084                         $out .= $outLine . "\n";
1085                 }
1086
1087                 # Closing open td, tr && table
1088                 while ( count( $td_history ) > 0 ) {
1089                         if ( array_pop( $td_history ) ) {
1090                                 $out .= "</td>\n";
1091                         }
1092                         if ( array_pop( $tr_history ) ) {
1093                                 $out .= "</tr>\n";
1094                         }
1095                         if ( !array_pop( $has_opened_tr ) ) {
1096                                 $out .= "<tr><td></td></tr>\n";
1097                         }
1098
1099                         $out .= "</table>\n";
1100                 }
1101
1102                 # Remove trailing line-ending (b/c)
1103                 if ( substr( $out, -1 ) === "\n" ) {
1104                         $out = substr( $out, 0, -1 );
1105                 }
1106
1107                 # special case: don't return empty table
1108                 if ( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
1109                         $out = '';
1110                 }
1111
1112                 wfProfileOut( __METHOD__ );
1113
1114                 return $out;
1115         }
1116
1117         /**
1118          * Helper function for parse() that transforms wiki markup into
1119          * HTML. Only called for $mOutputType == self::OT_HTML.
1120          *
1121          * @private
1122          *
1123          * @param $text string
1124          * @param $isMain bool
1125          * @param $frame bool
1126          *
1127          * @return string
1128          */
1129         function internalParse( $text, $isMain = true, $frame = false ) {
1130                 wfProfileIn( __METHOD__ );
1131
1132                 $origText = $text;
1133
1134                 # Hook to suspend the parser in this state
1135                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
1136                         wfProfileOut( __METHOD__ );
1137                         return $text;
1138                 }
1139
1140                 # if $frame is provided, then use $frame for replacing any variables
1141                 if ( $frame ) {
1142                         # use frame depth to infer how include/noinclude tags should be handled
1143                         # depth=0 means this is the top-level document; otherwise it's an included document
1144                         if ( !$frame->depth ) {
1145                                 $flag = 0;
1146                         } else {
1147                                 $flag = Parser::PTD_FOR_INCLUSION;
1148                         }
1149                         $dom = $this->preprocessToDom( $text, $flag );
1150                         $text = $frame->expand( $dom );
1151                 } else {
1152                         # if $frame is not provided, then use old-style replaceVariables
1153                         $text = $this->replaceVariables( $text );
1154                 }
1155
1156                 wfRunHooks( 'InternalParseBeforeSanitize', array( &$this, &$text, &$this->mStripState ) );
1157                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
1158                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
1159
1160                 # Tables need to come after variable replacement for things to work
1161                 # properly; putting them before other transformations should keep
1162                 # exciting things like link expansions from showing up in surprising
1163                 # places.
1164                 $text = $this->doTableStuff( $text );
1165
1166                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1167
1168                 $text = $this->doDoubleUnderscore( $text );
1169
1170                 $text = $this->doHeadings( $text );
1171                 $text = $this->replaceInternalLinks( $text );
1172                 $text = $this->doAllQuotes( $text );
1173                 $text = $this->replaceExternalLinks( $text );
1174
1175                 # replaceInternalLinks may sometimes leave behind
1176                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1177                 $text = str_replace( $this->mUniqPrefix . 'NOPARSE', '', $text );
1178
1179                 $text = $this->doMagicLinks( $text );
1180                 $text = $this->formatHeadings( $text, $origText, $isMain );
1181
1182                 wfProfileOut( __METHOD__ );
1183                 return $text;
1184         }
1185
1186         /**
1187          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1188          * magic external links.
1189          *
1190          * DML
1191          * @private
1192          *
1193          * @param $text string
1194          *
1195          * @return string
1196          */
1197         function doMagicLinks( $text ) {
1198                 wfProfileIn( __METHOD__ );
1199                 $prots = wfUrlProtocolsWithoutProtRel();
1200                 $urlChar = self::EXT_LINK_URL_CLASS;
1201                 $text = preg_replace_callback(
1202                         '!(?:                           # Start cases
1203                                 (<a[ \t\r\n>].*?</a>) |     # m[1]: Skip link text
1204                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
1205                                 (\\b(?i:$prots)$urlChar+) |  # m[3]: Free external links" . '
1206                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
1207                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
1208                                         (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1209                                         (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1210                                         [0-9Xx]                 # check digit
1211                                         \b)
1212                         )!xu', array( &$this, 'magicLinkCallback' ), $text );
1213                 wfProfileOut( __METHOD__ );
1214                 return $text;
1215         }
1216
1217         /**
1218          * @throws MWException
1219          * @param $m array
1220          * @return HTML|string
1221          */
1222         function magicLinkCallback( $m ) {
1223                 if ( isset( $m[1] ) && $m[1] !== '' ) {
1224                         # Skip anchor
1225                         return $m[0];
1226                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
1227                         # Skip HTML element
1228                         return $m[0];
1229                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
1230                         # Free external link
1231                         return $this->makeFreeExternalLink( $m[0] );
1232                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
1233                         # RFC or PMID
1234                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1235                                 $keyword = 'RFC';
1236                                 $urlmsg = 'rfcurl';
1237                                 $CssClass = 'mw-magiclink-rfc';
1238                                 $id = $m[4];
1239                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1240                                 $keyword = 'PMID';
1241                                 $urlmsg = 'pubmedurl';
1242                                 $CssClass = 'mw-magiclink-pmid';
1243                                 $id = $m[4];
1244                         } else {
1245                                 throw new MWException( __METHOD__ . ': unrecognised match type "' .
1246                                         substr( $m[0], 0, 20 ) . '"' );
1247                         }
1248                         $url = wfMessage( $urlmsg, $id )->inContentLanguage()->text();
1249                         return Linker::makeExternalLink( $url, "{$keyword} {$id}", true, $CssClass );
1250                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1251                         # ISBN
1252                         $isbn = $m[5];
1253                         $num = strtr( $isbn, array(
1254                                 '-' => '',
1255                                 ' ' => '',
1256                                 'x' => 'X',
1257                         ));
1258                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1259                         return'<a href="' .
1260                                 htmlspecialchars( $titleObj->getLocalURL() ) .
1261                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1262                 } else {
1263                         return $m[0];
1264                 }
1265         }
1266
1267         /**
1268          * Make a free external link, given a user-supplied URL
1269          *
1270          * @param $url string
1271          *
1272          * @return string HTML
1273          * @private
1274          */
1275         function makeFreeExternalLink( $url ) {
1276                 wfProfileIn( __METHOD__ );
1277
1278                 $trail = '';
1279
1280                 # The characters '<' and '>' (which were escaped by
1281                 # removeHTMLtags()) should not be included in
1282                 # URLs, per RFC 2396.
1283                 $m2 = array();
1284                 if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1285                         $trail = substr( $url, $m2[0][1] ) . $trail;
1286                         $url = substr( $url, 0, $m2[0][1] );
1287                 }
1288
1289                 # Move trailing punctuation to $trail
1290                 $sep = ',;\.:!?';
1291                 # If there is no left bracket, then consider right brackets fair game too
1292                 if ( strpos( $url, '(' ) === false ) {
1293                         $sep .= ')';
1294                 }
1295
1296                 $numSepChars = strspn( strrev( $url ), $sep );
1297                 if ( $numSepChars ) {
1298                         $trail = substr( $url, -$numSepChars ) . $trail;
1299                         $url = substr( $url, 0, -$numSepChars );
1300                 }
1301
1302                 $url = Sanitizer::cleanUrl( $url );
1303
1304                 # Is this an external image?
1305                 $text = $this->maybeMakeExternalImage( $url );
1306                 if ( $text === false ) {
1307                         # Not an image, make a link
1308                         $text = Linker::makeExternalLink( $url,
1309                                 $this->getConverterLanguage()->markNoConversion( $url, true ),
1310                                 true, 'free',
1311                                 $this->getExternalLinkAttribs( $url ) );
1312                         # Register it in the output object...
1313                         # Replace unnecessary URL escape codes with their equivalent characters
1314                         $pasteurized = self::replaceUnusualEscapes( $url );
1315                         $this->mOutput->addExternalLink( $pasteurized );
1316                 }
1317                 wfProfileOut( __METHOD__ );
1318                 return $text . $trail;
1319         }
1320
1321         /**
1322          * Parse headers and return html
1323          *
1324          * @private
1325          *
1326          * @param $text string
1327          *
1328          * @return string
1329          */
1330         function doHeadings( $text ) {
1331                 wfProfileIn( __METHOD__ );
1332                 for ( $i = 6; $i >= 1; --$i ) {
1333                         $h = str_repeat( '=', $i );
1334                         $text = preg_replace( "/^$h(.+)$h\\s*$/m", "<h$i>\\1</h$i>", $text );
1335                 }
1336                 wfProfileOut( __METHOD__ );
1337                 return $text;
1338         }
1339
1340         /**
1341          * Replace single quotes with HTML markup
1342          * @private
1343          *
1344          * @param $text string
1345          *
1346          * @return string the altered text
1347          */
1348         function doAllQuotes( $text ) {
1349                 wfProfileIn( __METHOD__ );
1350                 $outtext = '';
1351                 $lines = StringUtils::explode( "\n", $text );
1352                 foreach ( $lines as $line ) {
1353                         $outtext .= $this->doQuotes( $line ) . "\n";
1354                 }
1355                 $outtext = substr( $outtext, 0, -1 );
1356                 wfProfileOut( __METHOD__ );
1357                 return $outtext;
1358         }
1359
1360         /**
1361          * Helper function for doAllQuotes()
1362          *
1363          * @param $text string
1364          *
1365          * @return string
1366          */
1367         public function doQuotes( $text ) {
1368                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1369                 if ( count( $arr ) == 1 ) {
1370                         return $text;
1371                 } else {
1372                         # First, do some preliminary work. This may shift some apostrophes from
1373                         # being mark-up to being text. It also counts the number of occurrences
1374                         # of bold and italics mark-ups.
1375                         $numbold = 0;
1376                         $numitalics = 0;
1377                         for ( $i = 0; $i < count( $arr ); $i++ ) {
1378                                 if ( ( $i % 2 ) == 1 ) {
1379                                         # If there are ever four apostrophes, assume the first is supposed to
1380                                         # be text, and the remaining three constitute mark-up for bold text.
1381                                         if ( strlen( $arr[$i] ) == 4 ) {
1382                                                 $arr[$i - 1] .= "'";
1383                                                 $arr[$i] = "'''";
1384                                         } elseif ( strlen( $arr[$i] ) > 5 ) {
1385                                                 # If there are more than 5 apostrophes in a row, assume they're all
1386                                                 # text except for the last 5.
1387                                                 $arr[$i - 1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1388                                                 $arr[$i] = "'''''";
1389                                         }
1390                                         # Count the number of occurrences of bold and italics mark-ups.
1391                                         # We are not counting sequences of five apostrophes.
1392                                         if ( strlen( $arr[$i] ) == 2 ) {
1393                                                 $numitalics++;
1394                                         } elseif ( strlen( $arr[$i] ) == 3 ) {
1395                                                 $numbold++;
1396                                         } elseif ( strlen( $arr[$i] ) == 5 ) {
1397                                                 $numitalics++;
1398                                                 $numbold++;
1399                                         }
1400                                 }
1401                         }
1402
1403                         # If there is an odd number of both bold and italics, it is likely
1404                         # that one of the bold ones was meant to be an apostrophe followed
1405                         # by italics. Which one we cannot know for certain, but it is more
1406                         # likely to be one that has a single-letter word before it.
1407                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) ) {
1408                                 $i = 0;
1409                                 $firstsingleletterword = -1;
1410                                 $firstmultiletterword = -1;
1411                                 $firstspace = -1;
1412                                 foreach ( $arr as $r ) {
1413                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) ) {
1414                                                 $x1 = substr( $arr[$i - 1], -1 );
1415                                                 $x2 = substr( $arr[$i - 1], -2, 1 );
1416                                                 if ( $x1 === ' ' ) {
1417                                                         if ( $firstspace == -1 ) {
1418                                                                 $firstspace = $i;
1419                                                         }
1420                                                 } elseif ( $x2 === ' ' ) {
1421                                                         if ( $firstsingleletterword == -1 ) {
1422                                                                 $firstsingleletterword = $i;
1423                                                         }
1424                                                 } else {
1425                                                         if ( $firstmultiletterword == -1 ) {
1426                                                                 $firstmultiletterword = $i;
1427                                                         }
1428                                                 }
1429                                         }
1430                                         $i++;
1431                                 }
1432
1433                                 # If there is a single-letter word, use it!
1434                                 if ( $firstsingleletterword > -1 ) {
1435                                         $arr[$firstsingleletterword] = "''";
1436                                         $arr[$firstsingleletterword - 1] .= "'";
1437                                 } elseif ( $firstmultiletterword > -1 ) {
1438                                         # If not, but there's a multi-letter word, use that one.
1439                                         $arr[$firstmultiletterword] = "''";
1440                                         $arr[$firstmultiletterword - 1] .= "'";
1441                                 } elseif ( $firstspace > -1 ) {
1442                                         # ... otherwise use the first one that has neither.
1443                                         # (notice that it is possible for all three to be -1 if, for example,
1444                                         # there is only one pentuple-apostrophe in the line)
1445                                         $arr[$firstspace] = "''";
1446                                         $arr[$firstspace - 1] .= "'";
1447                                 }
1448                         }
1449
1450                         # Now let's actually convert our apostrophic mush to HTML!
1451                         $output = '';
1452                         $buffer = '';
1453                         $state = '';
1454                         $i = 0;
1455                         foreach ( $arr as $r ) {
1456                                 if ( ( $i % 2 ) == 0 ) {
1457                                         if ( $state === 'both' ) {
1458                                                 $buffer .= $r;
1459                                         } else {
1460                                                 $output .= $r;
1461                                         }
1462                                 } else {
1463                                         if ( strlen( $r ) == 2 ) {
1464                                                 if ( $state === 'i' ) {
1465                                                         $output .= '</i>'; $state = '';
1466                                                 } elseif ( $state === 'bi' ) {
1467                                                         $output .= '</i>'; $state = 'b';
1468                                                 } elseif ( $state === 'ib' ) {
1469                                                         $output .= '</b></i><b>'; $state = 'b';
1470                                                 } elseif ( $state === 'both' ) {
1471                                                         $output .= '<b><i>' . $buffer . '</i>'; $state = 'b';
1472                                                 } else { # $state can be 'b' or ''
1473                                                         $output .= '<i>'; $state .= 'i';
1474                                                 }
1475                                         } elseif ( strlen( $r ) == 3 ) {
1476                                                 if ( $state === 'b' ) {
1477                                                         $output .= '</b>'; $state = '';
1478                                                 } elseif ( $state === 'bi' ) {
1479                                                         $output .= '</i></b><i>'; $state = 'i';
1480                                                 } elseif ( $state === 'ib' ) {
1481                                                         $output .= '</b>'; $state = 'i';
1482                                                 } elseif ( $state === 'both' ) {
1483                                                         $output .= '<i><b>' . $buffer . '</b>'; $state = 'i';
1484                                                 } else { # $state can be 'i' or ''
1485                                                         $output .= '<b>'; $state .= 'b';
1486                                                 }
1487                                         } elseif ( strlen( $r ) == 5 ) {
1488                                                 if ( $state === 'b' ) {
1489                                                         $output .= '</b><i>'; $state = 'i';
1490                                                 } elseif ( $state === 'i' ) {
1491                                                         $output .= '</i><b>'; $state = 'b';
1492                                                 } elseif ( $state === 'bi' ) {
1493                                                         $output .= '</i></b>'; $state = '';
1494                                                 } elseif ( $state === 'ib' ) {
1495                                                         $output .= '</b></i>'; $state = '';
1496                                                 } elseif ( $state === 'both' ) {
1497                                                         $output .= '<i><b>' . $buffer . '</b></i>'; $state = '';
1498                                                 } else { # ($state == '')
1499                                                         $buffer = ''; $state = 'both';
1500                                                 }
1501                                         }
1502                                 }
1503                                 $i++;
1504                         }
1505                         # Now close all remaining tags.  Notice that the order is important.
1506                         if ( $state === 'b' || $state === 'ib' ) {
1507                                 $output .= '</b>';
1508                         }
1509                         if ( $state === 'i' || $state === 'bi' || $state === 'ib' ) {
1510                                 $output .= '</i>';
1511                         }
1512                         if ( $state === 'bi' ) {
1513                                 $output .= '</b>';
1514                         }
1515                         # There might be lonely ''''', so make sure we have a buffer
1516                         if ( $state === 'both' && $buffer ) {
1517                                 $output .= '<b><i>' . $buffer . '</i></b>';
1518                         }
1519                         return $output;
1520                 }
1521         }
1522
1523         /**
1524          * Replace external links (REL)
1525          *
1526          * Note: this is all very hackish and the order of execution matters a lot.
1527          * Make sure to run maintenance/parserTests.php if you change this code.
1528          *
1529          * @private
1530          *
1531          * @param $text string
1532          *
1533          * @throws MWException
1534          * @return string
1535          */
1536         function replaceExternalLinks( $text ) {
1537                 wfProfileIn( __METHOD__ );
1538
1539                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1540                 if ( $bits === false ) {
1541                         wfProfileOut( __METHOD__ );
1542                         throw new MWException( "PCRE needs to be compiled with --enable-unicode-properties in order for MediaWiki to function" );
1543                 }
1544                 $s = array_shift( $bits );
1545
1546                 $i = 0;
1547                 while ( $i < count( $bits ) ) {
1548                         $url = $bits[$i++];
1549                         $i++; // protocol
1550                         $text = $bits[$i++];
1551                         $trail = $bits[$i++];
1552
1553                         # The characters '<' and '>' (which were escaped by
1554                         # removeHTMLtags()) should not be included in
1555                         # URLs, per RFC 2396.
1556                         $m2 = array();
1557                         if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1558                                 $text = substr( $url, $m2[0][1] ) . ' ' . $text;
1559                                 $url = substr( $url, 0, $m2[0][1] );
1560                         }
1561
1562                         # If the link text is an image URL, replace it with an <img> tag
1563                         # This happened by accident in the original parser, but some people used it extensively
1564                         $img = $this->maybeMakeExternalImage( $text );
1565                         if ( $img !== false ) {
1566                                 $text = $img;
1567                         }
1568
1569                         $dtrail = '';
1570
1571                         # Set linktype for CSS - if URL==text, link is essentially free
1572                         $linktype = ( $text === $url ) ? 'free' : 'text';
1573
1574                         # No link text, e.g. [http://domain.tld/some.link]
1575                         if ( $text == '' ) {
1576                                 # Autonumber
1577                                 $langObj = $this->getTargetLanguage();
1578                                 $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1579                                 $linktype = 'autonumber';
1580                         } else {
1581                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1582                                 # Check for trail
1583                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1584                         }
1585
1586                         $text = $this->getConverterLanguage()->markNoConversion( $text );
1587
1588                         $url = Sanitizer::cleanUrl( $url );
1589
1590                         # Use the encoded URL
1591                         # This means that users can paste URLs directly into the text
1592                         # Funny characters like ö aren't valid in URLs anyway
1593                         # This was changed in August 2004
1594                         $s .= Linker::makeExternalLink( $url, $text, false, $linktype,
1595                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1596
1597                         # Register link in the output object.
1598                         # Replace unnecessary URL escape codes with the referenced character
1599                         # This prevents spammers from hiding links from the filters
1600                         $pasteurized = self::replaceUnusualEscapes( $url );
1601                         $this->mOutput->addExternalLink( $pasteurized );
1602                 }
1603
1604                 wfProfileOut( __METHOD__ );
1605                 return $s;
1606         }
1607         /**
1608          * Get the rel attribute for a particular external link.
1609          *
1610          * @since 1.21
1611          * @param string|bool $url optional URL, to extract the domain from for rel =>
1612          *   nofollow if appropriate
1613          * @param $title Title optional Title, for wgNoFollowNsExceptions lookups
1614          * @return string|null rel attribute for $url
1615          */
1616         public static function getExternalLinkRel( $url = false, $title = null ) {
1617                 global $wgNoFollowLinks, $wgNoFollowNsExceptions, $wgNoFollowDomainExceptions;
1618                 $ns = $title ? $title->getNamespace() : false;
1619                 if ( $wgNoFollowLinks && !in_array( $ns, $wgNoFollowNsExceptions ) &&
1620                                 !wfMatchesDomainList( $url, $wgNoFollowDomainExceptions ) )
1621                 {
1622                         return 'nofollow';
1623                 }
1624                 return null;
1625         }
1626         /**
1627          * Get an associative array of additional HTML attributes appropriate for a
1628          * particular external link.  This currently may include rel => nofollow
1629          * (depending on configuration, namespace, and the URL's domain) and/or a
1630          * target attribute (depending on configuration).
1631          *
1632          * @param string|bool $url optional URL, to extract the domain from for rel =>
1633          *   nofollow if appropriate
1634          * @return Array associative array of HTML attributes
1635          */
1636         function getExternalLinkAttribs( $url = false ) {
1637                 $attribs = array();
1638                 $attribs['rel'] = self::getExternalLinkRel( $url, $this->mTitle );
1639
1640                 if ( $this->mOptions->getExternalLinkTarget() ) {
1641                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1642                 }
1643                 return $attribs;
1644         }
1645
1646         /**
1647          * Replace unusual URL escape codes with their equivalent characters
1648          *
1649          * @param $url String
1650          * @return String
1651          *
1652          * @todo  This can merge genuinely required bits in the path or query string,
1653          *        breaking legit URLs. A proper fix would treat the various parts of
1654          *        the URL differently; as a workaround, just use the output for
1655          *        statistical records, not for actual linking/output.
1656          */
1657         static function replaceUnusualEscapes( $url ) {
1658                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1659                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1660         }
1661
1662         /**
1663          * Callback function used in replaceUnusualEscapes().
1664          * Replaces unusual URL escape codes with their equivalent character
1665          *
1666          * @param $matches array
1667          *
1668          * @return string
1669          */
1670         private static function replaceUnusualEscapesCallback( $matches ) {
1671                 $char = urldecode( $matches[0] );
1672                 $ord = ord( $char );
1673                 # Is it an unsafe or HTTP reserved character according to RFC 1738?
1674                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1675                         # No, shouldn't be escaped
1676                         return $char;
1677                 } else {
1678                         # Yes, leave it escaped
1679                         return $matches[0];
1680                 }
1681         }
1682
1683         /**
1684          * make an image if it's allowed, either through the global
1685          * option, through the exception, or through the on-wiki whitelist
1686          * @private
1687          *
1688          * $param $url string
1689          *
1690          * @return string
1691          */
1692         function maybeMakeExternalImage( $url ) {
1693                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1694                 $imagesexception = !empty( $imagesfrom );
1695                 $text = false;
1696                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1697                 if ( $imagesexception && is_array( $imagesfrom ) ) {
1698                         $imagematch = false;
1699                         foreach ( $imagesfrom as $match ) {
1700                                 if ( strpos( $url, $match ) === 0 ) {
1701                                         $imagematch = true;
1702                                         break;
1703                                 }
1704                         }
1705                 } elseif ( $imagesexception ) {
1706                         $imagematch = ( strpos( $url, $imagesfrom ) === 0 );
1707                 } else {
1708                         $imagematch = false;
1709                 }
1710                 if ( $this->mOptions->getAllowExternalImages()
1711                          || ( $imagesexception && $imagematch ) ) {
1712                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1713                                 # Image found
1714                                 $text = Linker::makeExternalImage( $url );
1715                         }
1716                 }
1717                 if ( !$text && $this->mOptions->getEnableImageWhitelist()
1718                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1719                         $whitelist = explode( "\n", wfMessage( 'external_image_whitelist' )->inContentLanguage()->text() );
1720                         foreach ( $whitelist as $entry ) {
1721                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1722                                 if ( strpos( $entry, '#' ) === 0 || $entry === '' ) {
1723                                         continue;
1724                                 }
1725                                 if ( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1726                                         # Image matches a whitelist entry
1727                                         $text = Linker::makeExternalImage( $url );
1728                                         break;
1729                                 }
1730                         }
1731                 }
1732                 return $text;
1733         }
1734
1735         /**
1736          * Process [[ ]] wikilinks
1737          *
1738          * @param $s string
1739          *
1740          * @return String: processed text
1741          *
1742          * @private
1743          */
1744         function replaceInternalLinks( $s ) {
1745                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1746                 return $s;
1747         }
1748
1749         /**
1750          * Process [[ ]] wikilinks (RIL)
1751          * @param $s
1752          * @throws MWException
1753          * @return LinkHolderArray
1754          *
1755          * @private
1756          */
1757         function replaceInternalLinks2( &$s ) {
1758                 wfProfileIn( __METHOD__ );
1759
1760                 wfProfileIn( __METHOD__ . '-setup' );
1761                 static $tc = false, $e1, $e1_img;
1762                 # the % is needed to support urlencoded titles as well
1763                 if ( !$tc ) {
1764                         $tc = Title::legalChars() . '#%';
1765                         # Match a link having the form [[namespace:link|alternate]]trail
1766                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1767                         # Match cases where there is no "]]", which might still be images
1768                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1769                 }
1770
1771                 $holders = new LinkHolderArray( $this );
1772
1773                 # split the entire text string on occurrences of [[
1774                 $a = StringUtils::explode( '[[', ' ' . $s );
1775                 # get the first element (all text up to first [[), and remove the space we added
1776                 $s = $a->current();
1777                 $a->next();
1778                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1779                 $s = substr( $s, 1 );
1780
1781                 $useLinkPrefixExtension = $this->getTargetLanguage()->linkPrefixExtension();
1782                 $e2 = null;
1783                 if ( $useLinkPrefixExtension ) {
1784                         # Match the end of a line for a word that's not followed by whitespace,
1785                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1786                         $e2 = wfMessage( 'linkprefix' )->inContentLanguage()->text();
1787                 }
1788
1789                 if ( is_null( $this->mTitle ) ) {
1790                         wfProfileOut( __METHOD__ . '-setup' );
1791                         wfProfileOut( __METHOD__ );
1792                         throw new MWException( __METHOD__ . ": \$this->mTitle is null\n" );
1793                 }
1794                 $nottalk = !$this->mTitle->isTalkPage();
1795
1796                 if ( $useLinkPrefixExtension ) {
1797                         $m = array();
1798                         if ( preg_match( $e2, $s, $m ) ) {
1799                                 $first_prefix = $m[2];
1800                         } else {
1801                                 $first_prefix = false;
1802                         }
1803                 } else {
1804                         $prefix = '';
1805                 }
1806
1807                 $useSubpages = $this->areSubpagesAllowed();
1808                 wfProfileOut( __METHOD__ . '-setup' );
1809
1810                 # Loop for each link
1811                 for ( ; $line !== false && $line !== null; $a->next(), $line = $a->current() ) {
1812                         # Check for excessive memory usage
1813                         if ( $holders->isBig() ) {
1814                                 # Too big
1815                                 # Do the existence check, replace the link holders and clear the array
1816                                 $holders->replace( $s );
1817                                 $holders->clear();
1818                         }
1819
1820                         if ( $useLinkPrefixExtension ) {
1821                                 wfProfileIn( __METHOD__ . '-prefixhandling' );
1822                                 if ( preg_match( $e2, $s, $m ) ) {
1823                                         $prefix = $m[2];
1824                                         $s = $m[1];
1825                                 } else {
1826                                         $prefix = '';
1827                                 }
1828                                 # first link
1829                                 if ( $first_prefix ) {
1830                                         $prefix = $first_prefix;
1831                                         $first_prefix = false;
1832                                 }
1833                                 wfProfileOut( __METHOD__ . '-prefixhandling' );
1834                         }
1835
1836                         $might_be_img = false;
1837
1838                         wfProfileIn( __METHOD__ . "-e1" );
1839                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1840                                 $text = $m[2];
1841                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1842                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1843                                 # the real problem is with the $e1 regex
1844                                 # See bug 1300.
1845                                 #
1846                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1847                                 # and no image is in sight. See bug 2095.
1848                                 #
1849                                 if ( $text !== '' &&
1850                                         substr( $m[3], 0, 1 ) === ']' &&
1851                                         strpos( $text, '[' ) !== false
1852                                 )
1853                                 {
1854                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1855                                         $m[3] = substr( $m[3], 1 );
1856                                 }
1857                                 # fix up urlencoded title texts
1858                                 if ( strpos( $m[1], '%' ) !== false ) {
1859                                         # Should anchors '#' also be rejected?
1860                                         $m[1] = str_replace( array( '<', '>' ), array( '&lt;', '&gt;' ), rawurldecode( $m[1] ) );
1861                                 }
1862                                 $trail = $m[3];
1863                         } elseif ( preg_match( $e1_img, $line, $m ) ) { # Invalid, but might be an image with a link in its caption
1864                                 $might_be_img = true;
1865                                 $text = $m[2];
1866                                 if ( strpos( $m[1], '%' ) !== false ) {
1867                                         $m[1] = rawurldecode( $m[1] );
1868                                 }
1869                                 $trail = "";
1870                         } else { # Invalid form; output directly
1871                                 $s .= $prefix . '[[' . $line;
1872                                 wfProfileOut( __METHOD__ . "-e1" );
1873                                 continue;
1874                         }
1875                         wfProfileOut( __METHOD__ . "-e1" );
1876                         wfProfileIn( __METHOD__ . "-misc" );
1877
1878                         # Don't allow internal links to pages containing
1879                         # PROTO: where PROTO is a valid URL protocol; these
1880                         # should be external links.
1881                         if ( preg_match( '/^(?i:' . $this->mUrlProtocols . ')/', $m[1] ) ) {
1882                                 $s .= $prefix . '[[' . $line;
1883                                 wfProfileOut( __METHOD__ . "-misc" );
1884                                 continue;
1885                         }
1886
1887                         # Make subpage if necessary
1888                         if ( $useSubpages ) {
1889                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1890                         } else {
1891                                 $link = $m[1];
1892                         }
1893
1894                         $noforce = ( substr( $m[1], 0, 1 ) !== ':' );
1895                         if ( !$noforce ) {
1896                                 # Strip off leading ':'
1897                                 $link = substr( $link, 1 );
1898                         }
1899
1900                         wfProfileOut( __METHOD__ . "-misc" );
1901                         wfProfileIn( __METHOD__ . "-title" );
1902                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1903                         if ( $nt === null ) {
1904                                 $s .= $prefix . '[[' . $line;
1905                                 wfProfileOut( __METHOD__ . "-title" );
1906                                 continue;
1907                         }
1908
1909                         $ns = $nt->getNamespace();
1910                         $iw = $nt->getInterWiki();
1911                         wfProfileOut( __METHOD__ . "-title" );
1912
1913                         if ( $might_be_img ) { # if this is actually an invalid link
1914                                 wfProfileIn( __METHOD__ . "-might_be_img" );
1915                                 if ( $ns == NS_FILE && $noforce ) { # but might be an image
1916                                         $found = false;
1917                                         while ( true ) {
1918                                                 # look at the next 'line' to see if we can close it there
1919                                                 $a->next();
1920                                                 $next_line = $a->current();
1921                                                 if ( $next_line === false || $next_line === null ) {
1922                                                         break;
1923                                                 }
1924                                                 $m = explode( ']]', $next_line, 3 );
1925                                                 if ( count( $m ) == 3 ) {
1926                                                         # the first ]] closes the inner link, the second the image
1927                                                         $found = true;
1928                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1929                                                         $trail = $m[2];
1930                                                         break;
1931                                                 } elseif ( count( $m ) == 2 ) {
1932                                                         # if there's exactly one ]] that's fine, we'll keep looking
1933                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1934                                                 } else {
1935                                                         # if $next_line is invalid too, we need look no further
1936                                                         $text .= '[[' . $next_line;
1937                                                         break;
1938                                                 }
1939                                         }
1940                                         if ( !$found ) {
1941                                                 # we couldn't find the end of this imageLink, so output it raw
1942                                                 # but don't ignore what might be perfectly normal links in the text we've examined
1943                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1944                                                 $s .= "{$prefix}[[$link|$text";
1945                                                 # note: no $trail, because without an end, there *is* no trail
1946                                                 wfProfileOut( __METHOD__ . "-might_be_img" );
1947                                                 continue;
1948                                         }
1949                                 } else { # it's not an image, so output it raw
1950                                         $s .= "{$prefix}[[$link|$text";
1951                                         # note: no $trail, because without an end, there *is* no trail
1952                                         wfProfileOut( __METHOD__ . "-might_be_img" );
1953                                         continue;
1954                                 }
1955                                 wfProfileOut( __METHOD__ . "-might_be_img" );
1956                         }
1957
1958                         $wasblank = ( $text == '' );
1959                         if ( $wasblank ) {
1960                                 $text = $link;
1961                         } else {
1962                                 # Bug 4598 madness. Handle the quotes only if they come from the alternate part
1963                                 # [[Lista d''e paise d''o munno]] -> <a href="...">Lista d''e paise d''o munno</a>
1964                                 # [[Criticism of Harry Potter|Criticism of ''Harry Potter'']]
1965                                 #    -> <a href="Criticism of Harry Potter">Criticism of <i>Harry Potter</i></a>
1966                                 $text = $this->doQuotes( $text );
1967                         }
1968
1969                         # Link not escaped by : , create the various objects
1970                         if ( $noforce ) {
1971                                 # Interwikis
1972                                 wfProfileIn( __METHOD__ . "-interwiki" );
1973                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && Language::fetchLanguageName( $iw, null, 'mw' ) ) {
1974                                         // XXX: the above check prevents links to sites with identifiers that are not language codes
1975
1976                                         # Bug 24502: filter duplicates
1977                                         if ( !isset( $this->mLangLinkLanguages[$iw] ) ) {
1978                                                 $this->mLangLinkLanguages[$iw] = true;
1979                                                 $this->mOutput->addLanguageLink( $nt->getFullText() );
1980                                         }
1981
1982                                         $s = rtrim( $s . $prefix );
1983                                         $s .= trim( $trail, "\n" ) == '' ? '': $prefix . $trail;
1984                                         wfProfileOut( __METHOD__ . "-interwiki" );
1985                                         continue;
1986                                 }
1987                                 wfProfileOut( __METHOD__ . "-interwiki" );
1988
1989                                 if ( $ns == NS_FILE ) {
1990                                         wfProfileIn( __METHOD__ . "-image" );
1991                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1992                                                 if ( $wasblank ) {
1993                                                         # if no parameters were passed, $text
1994                                                         # becomes something like "File:Foo.png",
1995                                                         # which we don't want to pass on to the
1996                                                         # image generator
1997                                                         $text = '';
1998                                                 } else {
1999                                                         # recursively parse links inside the image caption
2000                                                         # actually, this will parse them in any other parameters, too,
2001                                                         # but it might be hard to fix that, and it doesn't matter ATM
2002                                                         $text = $this->replaceExternalLinks( $text );
2003                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
2004                                                 }
2005                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
2006                                                 $s .= $prefix . $this->armorLinks(
2007                                                         $this->makeImage( $nt, $text, $holders ) ) . $trail;
2008                                         } else {
2009                                                 $s .= $prefix . $trail;
2010                                         }
2011                                         wfProfileOut( __METHOD__ . "-image" );
2012                                         continue;
2013                                 }
2014
2015                                 if ( $ns == NS_CATEGORY ) {
2016                                         wfProfileIn( __METHOD__ . "-category" );
2017                                         $s = rtrim( $s . "\n" ); # bug 87
2018
2019                                         if ( $wasblank ) {
2020                                                 $sortkey = $this->getDefaultSort();
2021                                         } else {
2022                                                 $sortkey = $text;
2023                                         }
2024                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
2025                                         $sortkey = str_replace( "\n", '', $sortkey );
2026                                         $sortkey = $this->getConverterLanguage()->convertCategoryKey( $sortkey );
2027                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
2028
2029                                         /**
2030                                          * Strip the whitespace Category links produce, see bug 87
2031                                          * @todo We might want to use trim($tmp, "\n") here.
2032                                          */
2033                                         $s .= trim( $prefix . $trail, "\n" ) == '' ? '' : $prefix . $trail;
2034
2035                                         wfProfileOut( __METHOD__ . "-category" );
2036                                         continue;
2037                                 }
2038                         }
2039
2040                         # Self-link checking
2041                         if ( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
2042                                 if ( $nt->equals( $this->mTitle ) || ( !$nt->isKnown() && in_array(
2043                                         $this->mTitle->getPrefixedText(),
2044                                         $this->getConverterLanguage()->autoConvertToAllVariants( $nt->getPrefixedText() ),
2045                                         true
2046                                 ) ) ) {
2047                                         $s .= $prefix . Linker::makeSelfLinkObj( $nt, $text, '', $trail );
2048                                         continue;
2049                                 }
2050                         }
2051
2052                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
2053                         # @todo FIXME: Should do batch file existence checks, see comment below
2054                         if ( $ns == NS_MEDIA ) {
2055                                 wfProfileIn( __METHOD__ . "-media" );
2056                                 # Give extensions a chance to select the file revision for us
2057                                 $options = array();
2058                                 $descQuery = false;
2059                                 wfRunHooks( 'BeforeParserFetchFileAndTitle',
2060                                         array( $this, $nt, &$options, &$descQuery ) );
2061                                 # Fetch and register the file (file title may be different via hooks)
2062                                 list( $file, $nt ) = $this->fetchFileAndTitle( $nt, $options );
2063                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
2064                                 $s .= $prefix . $this->armorLinks(
2065                                         Linker::makeMediaLinkFile( $nt, $file, $text ) ) . $trail;
2066                                 wfProfileOut( __METHOD__ . "-media" );
2067                                 continue;
2068                         }
2069
2070                         wfProfileIn( __METHOD__ . "-always_known" );
2071                         # Some titles, such as valid special pages or files in foreign repos, should
2072                         # be shown as bluelinks even though they're not included in the page table
2073                         #
2074                         # @todo FIXME: isAlwaysKnown() can be expensive for file links; we should really do
2075                         # batch file existence checks for NS_FILE and NS_MEDIA
2076                         if ( $iw == '' && $nt->isAlwaysKnown() ) {
2077                                 $this->mOutput->addLink( $nt );
2078                                 $s .= $this->makeKnownLinkHolder( $nt, $text, array(), $trail, $prefix );
2079                         } else {
2080                                 # Links will be added to the output link list after checking
2081                                 $s .= $holders->makeHolder( $nt, $text, array(), $trail, $prefix );
2082                         }
2083                         wfProfileOut( __METHOD__ . "-always_known" );
2084                 }
2085                 wfProfileOut( __METHOD__ );
2086                 return $holders;
2087         }
2088
2089         /**
2090          * Render a forced-blue link inline; protect against double expansion of
2091          * URLs if we're in a mode that prepends full URL prefixes to internal links.
2092          * Since this little disaster has to split off the trail text to avoid
2093          * breaking URLs in the following text without breaking trails on the
2094          * wiki links, it's been made into a horrible function.
2095          *
2096          * @param $nt Title
2097          * @param $text String
2098          * @param array $query or String
2099          * @param $trail String
2100          * @param $prefix String
2101          * @return String: HTML-wikitext mix oh yuck
2102          */
2103         function makeKnownLinkHolder( $nt, $text = '', $query = array(), $trail = '', $prefix = '' ) {
2104                 list( $inside, $trail ) = Linker::splitTrail( $trail );
2105
2106                 if ( is_string( $query ) ) {
2107                         $query = wfCgiToArray( $query );
2108                 }
2109                 if ( $text == '' ) {
2110                         $text = htmlspecialchars( $nt->getPrefixedText() );
2111                 }
2112
2113                 $link = Linker::linkKnown( $nt, "$prefix$text$inside", array(), $query );
2114
2115                 return $this->armorLinks( $link ) . $trail;
2116         }
2117
2118         /**
2119          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
2120          * going to go through further parsing steps before inline URL expansion.
2121          *
2122          * Not needed quite as much as it used to be since free links are a bit
2123          * more sensible these days. But bracketed links are still an issue.
2124          *
2125          * @param string $text more-or-less HTML
2126          * @return String: less-or-more HTML with NOPARSE bits
2127          */
2128         function armorLinks( $text ) {
2129                 return preg_replace( '/\b((?i)' . $this->mUrlProtocols . ')/',
2130                         "{$this->mUniqPrefix}NOPARSE$1", $text );
2131         }
2132
2133         /**
2134          * Return true if subpage links should be expanded on this page.
2135          * @return Boolean
2136          */
2137         function areSubpagesAllowed() {
2138                 # Some namespaces don't allow subpages
2139                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
2140         }
2141
2142         /**
2143          * Handle link to subpage if necessary
2144          *
2145          * @param string $target the source of the link
2146          * @param &$text String: the link text, modified as necessary
2147          * @return string the full name of the link
2148          * @private
2149          */
2150         function maybeDoSubpageLink( $target, &$text ) {
2151                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
2152         }
2153
2154         /**#@+
2155          * Used by doBlockLevels()
2156          * @private
2157          *
2158          * @return string
2159          */
2160         function closeParagraph() {
2161                 $result = '';
2162                 if ( $this->mLastSection != '' ) {
2163                         $result = '</' . $this->mLastSection . ">\n";
2164                 }
2165                 $this->mInPre = false;
2166                 $this->mLastSection = '';
2167                 return $result;
2168         }
2169
2170         /**
2171          * getCommon() returns the length of the longest common substring
2172          * of both arguments, starting at the beginning of both.
2173          * @private
2174          *
2175          * @param $st1 string
2176          * @param $st2 string
2177          *
2178          * @return int
2179          */
2180         function getCommon( $st1, $st2 ) {
2181                 $fl = strlen( $st1 );
2182                 $shorter = strlen( $st2 );
2183                 if ( $fl < $shorter ) {
2184                         $shorter = $fl;
2185                 }
2186
2187                 for ( $i = 0; $i < $shorter; ++$i ) {
2188                         if ( $st1[$i] != $st2[$i] ) {
2189                                 break;
2190                         }
2191                 }
2192                 return $i;
2193         }
2194
2195         /**
2196          * These next three functions open, continue, and close the list
2197          * element appropriate to the prefix character passed into them.
2198          * @private
2199          *
2200          * @param $char string
2201          *
2202          * @return string
2203          */
2204         function openList( $char ) {
2205                 $result = $this->closeParagraph();
2206
2207                 if ( '*' === $char ) {
2208                         $result .= '<ul><li>';
2209                 } elseif ( '#' === $char ) {
2210                         $result .= '<ol><li>';
2211                 } elseif ( ':' === $char ) {
2212                         $result .= '<dl><dd>';
2213                 } elseif ( ';' === $char ) {
2214                         $result .= '<dl><dt>';
2215                         $this->mDTopen = true;
2216                 } else {
2217                         $result = '<!-- ERR 1 -->';
2218                 }
2219
2220                 return $result;
2221         }
2222
2223         /**
2224          * TODO: document
2225          * @param $char String
2226          * @private
2227          *
2228          * @return string
2229          */
2230         function nextItem( $char ) {
2231                 if ( '*' === $char || '#' === $char ) {
2232                         return '</li><li>';
2233                 } elseif ( ':' === $char || ';' === $char ) {
2234                         $close = '</dd>';
2235                         if ( $this->mDTopen ) {
2236                                 $close = '</dt>';
2237                         }
2238                         if ( ';' === $char ) {
2239                                 $this->mDTopen = true;
2240                                 return $close . '<dt>';
2241                         } else {
2242                                 $this->mDTopen = false;
2243                                 return $close . '<dd>';
2244                         }
2245                 }
2246                 return '<!-- ERR 2 -->';
2247         }
2248
2249         /**
2250          * TODO: document
2251          * @param $char String
2252          * @private
2253          *
2254          * @return string
2255          */
2256         function closeList( $char ) {
2257                 if ( '*' === $char ) {
2258                         $text = '</li></ul>';
2259                 } elseif ( '#' === $char ) {
2260                         $text = '</li></ol>';
2261                 } elseif ( ':' === $char ) {
2262                         if ( $this->mDTopen ) {
2263                                 $this->mDTopen = false;
2264                                 $text = '</dt></dl>';
2265                         } else {
2266                                 $text = '</dd></dl>';
2267                         }
2268                 } else {
2269                         return '<!-- ERR 3 -->';
2270                 }
2271                 return $text . "\n";
2272         }
2273         /**#@-*/
2274
2275         /**
2276          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
2277          *
2278          * @param $text String
2279          * @param $linestart Boolean: whether or not this is at the start of a line.
2280          * @private
2281          * @return string the lists rendered as HTML
2282          */
2283         function doBlockLevels( $text, $linestart ) {
2284                 wfProfileIn( __METHOD__ );
2285
2286                 # Parsing through the text line by line.  The main thing
2287                 # happening here is handling of block-level elements p, pre,
2288                 # and making lists from lines starting with * # : etc.
2289                 #
2290                 $textLines = StringUtils::explode( "\n", $text );
2291
2292                 $lastPrefix = $output = '';
2293                 $this->mDTopen = $inBlockElem = false;
2294                 $prefixLength = 0;
2295                 $paragraphStack = false;
2296
2297                 foreach ( $textLines as $oLine ) {
2298                         # Fix up $linestart
2299                         if ( !$linestart ) {
2300                                 $output .= $oLine;
2301                                 $linestart = true;
2302                                 continue;
2303                         }
2304                         # * = ul
2305                         # # = ol
2306                         # ; = dt
2307                         # : = dd
2308
2309                         $lastPrefixLength = strlen( $lastPrefix );
2310                         $preCloseMatch = preg_match( '/<\\/pre/i', $oLine );
2311                         $preOpenMatch = preg_match( '/<pre/i', $oLine );
2312                         # If not in a <pre> element, scan for and figure out what prefixes are there.
2313                         if ( !$this->mInPre ) {
2314                                 # Multiple prefixes may abut each other for nested lists.
2315                                 $prefixLength = strspn( $oLine, '*#:;' );
2316                                 $prefix = substr( $oLine, 0, $prefixLength );
2317
2318                                 # eh?
2319                                 # ; and : are both from definition-lists, so they're equivalent
2320                                 #  for the purposes of determining whether or not we need to open/close
2321                                 #  elements.
2322                                 $prefix2 = str_replace( ';', ':', $prefix );
2323                                 $t = substr( $oLine, $prefixLength );
2324                                 $this->mInPre = (bool)$preOpenMatch;
2325                         } else {
2326                                 # Don't interpret any other prefixes in preformatted text
2327                                 $prefixLength = 0;
2328                                 $prefix = $prefix2 = '';
2329                                 $t = $oLine;
2330                         }
2331
2332                         # List generation
2333                         if ( $prefixLength && $lastPrefix === $prefix2 ) {
2334                                 # Same as the last item, so no need to deal with nesting or opening stuff
2335                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2336                                 $paragraphStack = false;
2337
2338                                 if ( substr( $prefix, -1 ) === ';' ) {
2339                                         # The one nasty exception: definition lists work like this:
2340                                         # ; title : definition text
2341                                         # So we check for : in the remainder text to split up the
2342                                         # title and definition, without b0rking links.
2343                                         $term = $t2 = '';
2344                                         if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2345                                                 $t = $t2;
2346                                                 $output .= $term . $this->nextItem( ':' );
2347                                         }
2348                                 }
2349                         } elseif ( $prefixLength || $lastPrefixLength ) {
2350                                 # We need to open or close prefixes, or both.
2351
2352                                 # Either open or close a level...
2353                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2354                                 $paragraphStack = false;
2355
2356                                 # Close all the prefixes which aren't shared.
2357                                 while ( $commonPrefixLength < $lastPrefixLength ) {
2358                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength - 1] );
2359                                         --$lastPrefixLength;
2360                                 }
2361
2362                                 # Continue the current prefix if appropriate.
2363                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2364                                         $output .= $this->nextItem( $prefix[$commonPrefixLength - 1] );
2365                                 }
2366
2367                                 # Open prefixes where appropriate.
2368                                 while ( $prefixLength > $commonPrefixLength ) {
2369                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2370                                         $output .= $this->openList( $char );
2371
2372                                         if ( ';' === $char ) {
2373                                                 # @todo FIXME: This is dupe of code above
2374                                                 if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2375                                                         $t = $t2;
2376                                                         $output .= $term . $this->nextItem( ':' );
2377                                                 }
2378                                         }
2379                                         ++$commonPrefixLength;
2380                                 }
2381                                 $lastPrefix = $prefix2;
2382                         }
2383
2384                         # If we have no prefixes, go to paragraph mode.
2385                         if ( 0 == $prefixLength ) {
2386                                 wfProfileIn( __METHOD__ . "-paragraph" );
2387                                 # No prefix (not in list)--go to paragraph mode
2388                                 # XXX: use a stack for nestable elements like span, table and div
2389                                 $openmatch = preg_match( '/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<dl|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2390                                 $closematch = preg_match(
2391                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|' .
2392                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|' . $this->mUniqPrefix . '-pre|<\\/li|<\\/ul|<\\/ol|<\\/dl|<\\/?center)/iS', $t );
2393                                 if ( $openmatch or $closematch ) {
2394                                         $paragraphStack = false;
2395                                         # TODO bug 5718: paragraph closed
2396                                         $output .= $this->closeParagraph();
2397                                         if ( $preOpenMatch and !$preCloseMatch ) {
2398                                                 $this->mInPre = true;
2399                                         }
2400                                         $inBlockElem = !$closematch;
2401                                 } elseif ( !$inBlockElem && !$this->mInPre ) {
2402                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' || trim( $t ) != '' ) ) {
2403                                                 # pre
2404                                                 if ( $this->mLastSection !== 'pre' ) {
2405                                                         $paragraphStack = false;
2406                                                         $output .= $this->closeParagraph() . '<pre>';
2407                                                         $this->mLastSection = 'pre';
2408                                                 }
2409                                                 $t = substr( $t, 1 );
2410                                         } else {
2411                                                 # paragraph
2412                                                 if ( trim( $t ) === '' ) {
2413                                                         if ( $paragraphStack ) {
2414                                                                 $output .= $paragraphStack . '<br />';
2415                                                                 $paragraphStack = false;
2416                                                                 $this->mLastSection = 'p';
2417                                                         } else {
2418                                                                 if ( $this->mLastSection !== 'p' ) {
2419                                                                         $output .= $this->closeParagraph();
2420                                                                         $this->mLastSection = '';
2421                                                                         $paragraphStack = '<p>';
2422                                                                 } else {
2423                                                                         $paragraphStack = '</p><p>';
2424                                                                 }
2425                                                         }
2426                                                 } else {
2427                                                         if ( $paragraphStack ) {
2428                                                                 $output .= $paragraphStack;
2429                                                                 $paragraphStack = false;
2430                                                                 $this->mLastSection = 'p';
2431                                                         } elseif ( $this->mLastSection !== 'p' ) {
2432                                                                 $output .= $this->closeParagraph() . '<p>';
2433                                                                 $this->mLastSection = 'p';
2434                                                         }
2435                                                 }
2436                                         }
2437                                 }
2438                                 wfProfileOut( __METHOD__ . "-paragraph" );
2439                         }
2440                         # somewhere above we forget to get out of pre block (bug 785)
2441                         if ( $preCloseMatch && $this->mInPre ) {
2442                                 $this->mInPre = false;
2443                         }
2444                         if ( $paragraphStack === false ) {
2445                                 $output .= $t . "\n";
2446                         }
2447                 }
2448                 while ( $prefixLength ) {
2449                         $output .= $this->closeList( $prefix2[$prefixLength - 1] );
2450                         --$prefixLength;
2451                 }
2452                 if ( $this->mLastSection != '' ) {
2453                         $output .= '</' . $this->mLastSection . '>';
2454                         $this->mLastSection = '';
2455                 }
2456
2457                 wfProfileOut( __METHOD__ );
2458                 return $output;
2459         }
2460
2461         /**
2462          * Split up a string on ':', ignoring any occurrences inside tags
2463          * to prevent illegal overlapping.
2464          *
2465          * @param string $str the string to split
2466          * @param &$before String set to everything before the ':'
2467          * @param &$after String set to everything after the ':'
2468          * @throws MWException
2469          * @return String the position of the ':', or false if none found
2470          */
2471         function findColonNoLinks( $str, &$before, &$after ) {
2472                 wfProfileIn( __METHOD__ );
2473
2474                 $pos = strpos( $str, ':' );
2475                 if ( $pos === false ) {
2476                         # Nothing to find!
2477                         wfProfileOut( __METHOD__ );
2478                         return false;
2479                 }
2480
2481                 $lt = strpos( $str, '<' );
2482                 if ( $lt === false || $lt > $pos ) {
2483                         # Easy; no tag nesting to worry about
2484                         $before = substr( $str, 0, $pos );
2485                         $after = substr( $str, $pos + 1 );
2486                         wfProfileOut( __METHOD__ );
2487                         return $pos;
2488                 }
2489
2490                 # Ugly state machine to walk through avoiding tags.
2491                 $state = self::COLON_STATE_TEXT;
2492                 $stack = 0;
2493                 $len = strlen( $str );
2494                 for( $i = 0; $i < $len; $i++ ) {
2495                         $c = $str[$i];
2496
2497                         switch( $state ) {
2498                         # (Using the number is a performance hack for common cases)
2499                         case 0: # self::COLON_STATE_TEXT:
2500                                 switch( $c ) {
2501                                 case "<":
2502                                         # Could be either a <start> tag or an </end> tag
2503                                         $state = self::COLON_STATE_TAGSTART;
2504                                         break;
2505                                 case ":":
2506                                         if ( $stack == 0 ) {
2507                                                 # We found it!
2508                                                 $before = substr( $str, 0, $i );
2509                                                 $after = substr( $str, $i + 1 );
2510                                                 wfProfileOut( __METHOD__ );
2511                                                 return $i;
2512                                         }
2513                                         # Embedded in a tag; don't break it.
2514                                         break;
2515                                 default:
2516                                         # Skip ahead looking for something interesting
2517                                         $colon = strpos( $str, ':', $i );
2518                                         if ( $colon === false ) {
2519                                                 # Nothing else interesting
2520                                                 wfProfileOut( __METHOD__ );
2521                                                 return false;
2522                                         }
2523                                         $lt = strpos( $str, '<', $i );
2524                                         if ( $stack === 0 ) {
2525                                                 if ( $lt === false || $colon < $lt ) {
2526                                                         # We found it!
2527                                                         $before = substr( $str, 0, $colon );
2528                                                         $after = substr( $str, $colon + 1 );
2529                                                         wfProfileOut( __METHOD__ );
2530                                                         return $i;
2531                                                 }
2532                                         }
2533                                         if ( $lt === false ) {
2534                                                 # Nothing else interesting to find; abort!
2535                                                 # We're nested, but there's no close tags left. Abort!
2536                                                 break 2;
2537                                         }
2538                                         # Skip ahead to next tag start
2539                                         $i = $lt;
2540                                         $state = self::COLON_STATE_TAGSTART;
2541                                 }
2542                                 break;
2543                         case 1: # self::COLON_STATE_TAG:
2544                                 # In a <tag>
2545                                 switch( $c ) {
2546                                 case ">":
2547                                         $stack++;
2548                                         $state = self::COLON_STATE_TEXT;
2549                                         break;
2550                                 case "/":
2551                                         # Slash may be followed by >?
2552                                         $state = self::COLON_STATE_TAGSLASH;
2553                                         break;
2554                                 default:
2555                                         # ignore
2556                                 }
2557                                 break;
2558                         case 2: # self::COLON_STATE_TAGSTART:
2559                                 switch( $c ) {
2560                                 case "/":
2561                                         $state = self::COLON_STATE_CLOSETAG;
2562                                         break;
2563                                 case "!":
2564                                         $state = self::COLON_STATE_COMMENT;
2565                                         break;
2566                                 case ">":
2567                                         # Illegal early close? This shouldn't happen D:
2568                                         $state = self::COLON_STATE_TEXT;
2569                                         break;
2570                                 default:
2571                                         $state = self::COLON_STATE_TAG;
2572                                 }
2573                                 break;
2574                         case 3: # self::COLON_STATE_CLOSETAG:
2575                                 # In a </tag>
2576                                 if ( $c === ">" ) {
2577                                         $stack--;
2578                                         if ( $stack < 0 ) {
2579                                                 wfDebug( __METHOD__ . ": Invalid input; too many close tags\n" );
2580                                                 wfProfileOut( __METHOD__ );
2581                                                 return false;
2582                                         }
2583                                         $state = self::COLON_STATE_TEXT;
2584                                 }
2585                                 break;
2586                         case self::COLON_STATE_TAGSLASH:
2587                                 if ( $c === ">" ) {
2588                                         # Yes, a self-closed tag <blah/>
2589                                         $state = self::COLON_STATE_TEXT;
2590                                 } else {
2591                                         # Probably we're jumping the gun, and this is an attribute
2592                                         $state = self::COLON_STATE_TAG;
2593                                 }
2594                                 break;
2595                         case 5: # self::COLON_STATE_COMMENT:
2596                                 if ( $c === "-" ) {
2597                                         $state = self::COLON_STATE_COMMENTDASH;
2598                                 }
2599                                 break;
2600                         case self::COLON_STATE_COMMENTDASH:
2601                                 if ( $c === "-" ) {
2602                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2603                                 } else {
2604                                         $state = self::COLON_STATE_COMMENT;
2605                                 }
2606                                 break;
2607                         case self::COLON_STATE_COMMENTDASHDASH:
2608                                 if ( $c === ">" ) {
2609                                         $state = self::COLON_STATE_TEXT;
2610                                 } else {
2611                                         $state = self::COLON_STATE_COMMENT;
2612                                 }
2613                                 break;
2614                         default:
2615                                 wfProfileOut( __METHOD__ );
2616                                 throw new MWException( "State machine error in " . __METHOD__ );
2617                         }
2618                 }
2619                 if ( $stack > 0 ) {
2620                         wfDebug( __METHOD__ . ": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2621                         wfProfileOut( __METHOD__ );
2622                         return false;
2623                 }
2624                 wfProfileOut( __METHOD__ );
2625                 return false;
2626         }
2627
2628         /**
2629          * Return value of a magic variable (like PAGENAME)
2630          *
2631          * @private
2632          *
2633          * @param $index integer
2634          * @param bool|\PPFrame $frame
2635          *
2636          * @throws MWException
2637          * @return string
2638          */
2639         function getVariableValue( $index, $frame = false ) {
2640                 global $wgContLang, $wgSitename, $wgServer;
2641                 global $wgArticlePath, $wgScriptPath, $wgStylePath;
2642
2643                 if ( is_null( $this->mTitle ) ) {
2644                         // If no title set, bad things are going to happen
2645                         // later. Title should always be set since this
2646                         // should only be called in the middle of a parse
2647                         // operation (but the unit-tests do funky stuff)
2648                         throw new MWException( __METHOD__ . ' Should only be '
2649                                 . ' called while parsing (no title set)' );
2650                 }
2651
2652                 /**
2653                  * Some of these require message or data lookups and can be
2654                  * expensive to check many times.
2655                  */
2656                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2657                         if ( isset( $this->mVarCache[$index] ) ) {
2658                                 return $this->mVarCache[$index];
2659                         }
2660                 }
2661
2662                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2663                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2664
2665                 # Use the time zone
2666                 global $wgLocaltimezone;
2667                 if ( isset( $wgLocaltimezone ) ) {
2668                         $oldtz = date_default_timezone_get();
2669                         date_default_timezone_set( $wgLocaltimezone );
2670                 }
2671
2672                 $localTimestamp = date( 'YmdHis', $ts );
2673                 $localMonth = date( 'm', $ts );
2674                 $localMonth1 = date( 'n', $ts );
2675                 $localMonthName = date( 'n', $ts );
2676                 $localDay = date( 'j', $ts );
2677                 $localDay2 = date( 'd', $ts );
2678                 $localDayOfWeek = date( 'w', $ts );
2679                 $localWeek = date( 'W', $ts );
2680                 $localYear = date( 'Y', $ts );
2681                 $localHour = date( 'H', $ts );
2682                 if ( isset( $wgLocaltimezone ) ) {
2683                         date_default_timezone_set( $oldtz );
2684                 }
2685
2686                 $pageLang = $this->getFunctionLang();
2687
2688                 switch ( $index ) {
2689                         case 'currentmonth':
2690                                 $value = $pageLang->formatNum( gmdate( 'm', $ts ) );
2691                                 break;
2692                         case 'currentmonth1':
2693                                 $value = $pageLang->formatNum( gmdate( 'n', $ts ) );
2694                                 break;
2695                         case 'currentmonthname':
2696                                 $value = $pageLang->getMonthName( gmdate( 'n', $ts ) );
2697                                 break;
2698                         case 'currentmonthnamegen':
2699                                 $value = $pageLang->getMonthNameGen( gmdate( 'n', $ts ) );
2700                                 break;
2701                         case 'currentmonthabbrev':
2702                                 $value = $pageLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2703                                 break;
2704                         case 'currentday':
2705                                 $value = $pageLang->formatNum( gmdate( 'j', $ts ) );
2706                                 break;
2707                         case 'currentday2':
2708                                 $value = $pageLang->formatNum( gmdate( 'd', $ts ) );
2709                                 break;
2710                         case 'localmonth':
2711                                 $value = $pageLang->formatNum( $localMonth );
2712                                 break;
2713                         case 'localmonth1':
2714                                 $value = $pageLang->formatNum( $localMonth1 );
2715                                 break;
2716                         case 'localmonthname':
2717                                 $value = $pageLang->getMonthName( $localMonthName );
2718                                 break;
2719                         case 'localmonthnamegen':
2720                                 $value = $pageLang->getMonthNameGen( $localMonthName );
2721                                 break;
2722                         case 'localmonthabbrev':
2723                                 $value = $pageLang->getMonthAbbreviation( $localMonthName );
2724                                 break;
2725                         case 'localday':
2726                                 $value = $pageLang->formatNum( $localDay );
2727                                 break;
2728                         case 'localday2':
2729                                 $value = $pageLang->formatNum( $localDay2 );
2730                                 break;
2731                         case 'pagename':
2732                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2733                                 break;
2734                         case 'pagenamee':
2735                                 $value = wfEscapeWikiText( $this->mTitle->getPartialURL() );
2736                                 break;
2737                         case 'fullpagename':
2738                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2739                                 break;
2740                         case 'fullpagenamee':
2741                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedURL() );
2742                                 break;
2743                         case 'subpagename':
2744                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2745                                 break;
2746                         case 'subpagenamee':
2747                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageUrlForm() );
2748                                 break;
2749                         case 'basepagename':
2750                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2751                                 break;
2752                         case 'basepagenamee':
2753                                 $value = wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) ) );
2754                                 break;
2755                         case 'talkpagename':
2756                                 if ( $this->mTitle->canTalk() ) {
2757                                         $talkPage = $this->mTitle->getTalkPage();
2758                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2759                                 } else {
2760                                         $value = '';
2761                                 }
2762                                 break;
2763                         case 'talkpagenamee':
2764                                 if ( $this->mTitle->canTalk() ) {
2765                                         $talkPage = $this->mTitle->getTalkPage();
2766                                         $value = wfEscapeWikiText( $talkPage->getPrefixedURL() );
2767                                 } else {
2768                                         $value = '';
2769                                 }
2770                                 break;
2771                         case 'subjectpagename':
2772                                 $subjPage = $this->mTitle->getSubjectPage();
2773                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2774                                 break;
2775                         case 'subjectpagenamee':
2776                                 $subjPage = $this->mTitle->getSubjectPage();
2777                                 $value = wfEscapeWikiText( $subjPage->getPrefixedURL() );
2778                                 break;
2779                         case 'pageid': // requested in bug 23427
2780                                 $pageid = $this->getTitle()->getArticleID();
2781                                 if( $pageid == 0 ) {
2782                                         # 0 means the page doesn't exist in the database,
2783                                         # which means the user is previewing a new page.
2784                                         # The vary-revision flag must be set, because the magic word
2785                                         # will have a different value once the page is saved.
2786                                         $this->mOutput->setFlag( 'vary-revision' );
2787                                         wfDebug( __METHOD__ . ": {{PAGEID}} used in a new page, setting vary-revision...\n" );
2788                                 }
2789                                 $value = $pageid ? $pageid : null;
2790                                 break;
2791                         case 'revisionid':
2792                                 # Let the edit saving system know we should parse the page
2793                                 # *after* a revision ID has been assigned.
2794                                 $this->mOutput->setFlag( 'vary-revision' );
2795                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2796                                 $value = $this->mRevisionId;
2797                                 break;
2798                         case 'revisionday':
2799                                 # Let the edit saving system know we should parse the page
2800                                 # *after* a revision ID has been assigned. This is for null edits.
2801                                 $this->mOutput->setFlag( 'vary-revision' );
2802                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2803                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2804                                 break;
2805                         case 'revisionday2':
2806                                 # Let the edit saving system know we should parse the page
2807                                 # *after* a revision ID has been assigned. This is for null edits.
2808                                 $this->mOutput->setFlag( 'vary-revision' );
2809                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2810                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2811                                 break;
2812                         case 'revisionmonth':
2813                                 # Let the edit saving system know we should parse the page
2814                                 # *after* a revision ID has been assigned. This is for null edits.
2815                                 $this->mOutput->setFlag( 'vary-revision' );
2816                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2817                                 $value = substr( $this->getRevisionTimestamp(), 4, 2 );
2818                                 break;
2819                         case 'revisionmonth1':
2820                                 # Let the edit saving system know we should parse the page
2821                                 # *after* a revision ID has been assigned. This is for null edits.
2822                                 $this->mOutput->setFlag( 'vary-revision' );
2823                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH1}} used, setting vary-revision...\n" );
2824                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2825                                 break;
2826                         case 'revisionyear':
2827                                 # Let the edit saving system know we should parse the page
2828                                 # *after* a revision ID has been assigned. This is for null edits.
2829                                 $this->mOutput->setFlag( 'vary-revision' );
2830                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2831                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2832                                 break;
2833                         case 'revisiontimestamp':
2834                                 # Let the edit saving system know we should parse the page
2835                                 # *after* a revision ID has been assigned. This is for null edits.
2836                                 $this->mOutput->setFlag( 'vary-revision' );
2837                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2838                                 $value = $this->getRevisionTimestamp();
2839                                 break;
2840                         case 'revisionuser':
2841                                 # Let the edit saving system know we should parse the page
2842                                 # *after* a revision ID has been assigned. This is for null edits.
2843                                 $this->mOutput->setFlag( 'vary-revision' );
2844                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2845                                 $value = $this->getRevisionUser();
2846                                 break;
2847                         case 'namespace':
2848                                 $value = str_replace( '_', ' ', $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2849                                 break;
2850                         case 'namespacee':
2851                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2852                                 break;
2853                         case 'namespacenumber':
2854                                 $value = $this->mTitle->getNamespace();
2855                                 break;
2856                         case 'talkspace':
2857                                 $value = $this->mTitle->canTalk() ? str_replace( '_', ' ', $this->mTitle->getTalkNsText() ) : '';
2858                                 break;
2859                         case 'talkspacee':
2860                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2861                                 break;
2862                         case 'subjectspace':
2863                                 $value = $this->mTitle->getSubjectNsText();
2864                                 break;
2865                         case 'subjectspacee':
2866                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2867                                 break;
2868                         case 'currentdayname':
2869                                 $value = $pageLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2870                                 break;
2871                         case 'currentyear':
2872                                 $value = $pageLang->formatNum( gmdate( 'Y', $ts ), true );
2873                                 break;
2874                         case 'currenttime':
2875                                 $value = $pageLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2876                                 break;
2877                         case 'currenthour':
2878                                 $value = $pageLang->formatNum( gmdate( 'H', $ts ), true );
2879                                 break;
2880                         case 'currentweek':
2881                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2882                                 # int to remove the padding
2883                                 $value = $pageLang->formatNum( (int)gmdate( 'W', $ts ) );
2884                                 break;
2885                         case 'currentdow':
2886                                 $value = $pageLang->formatNum( gmdate( 'w', $ts ) );
2887                                 break;
2888                         case 'localdayname':
2889                                 $value = $pageLang->getWeekdayName( $localDayOfWeek + 1 );
2890                                 break;
2891                         case 'localyear':
2892                                 $value = $pageLang->formatNum( $localYear, true );
2893                                 break;
2894                         case 'localtime':
2895                                 $value = $pageLang->time( $localTimestamp, false, false );
2896                                 break;
2897                         case 'localhour':
2898                                 $value = $pageLang->formatNum( $localHour, true );
2899                                 break;
2900                         case 'localweek':
2901                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2902                                 # int to remove the padding
2903                                 $value = $pageLang->formatNum( (int)$localWeek );
2904                                 break;
2905                         case 'localdow':
2906                                 $value = $pageLang->formatNum( $localDayOfWeek );
2907                                 break;
2908                         case 'numberofarticles':
2909                                 $value = $pageLang->formatNum( SiteStats::articles() );
2910                                 break;
2911                         case 'numberoffiles':
2912                                 $value = $pageLang->formatNum( SiteStats::images() );
2913                                 break;
2914                         case 'numberofusers':
2915                                 $value = $pageLang->formatNum( SiteStats::users() );
2916                                 break;
2917                         case 'numberofactiveusers':
2918                                 $value = $pageLang->formatNum( SiteStats::activeUsers() );
2919                                 break;
2920                         case 'numberofpages':
2921                                 $value = $pageLang->formatNum( SiteStats::pages() );
2922                                 break;
2923                         case 'numberofadmins':
2924                                 $value = $pageLang->formatNum( SiteStats::numberingroup( 'sysop' ) );
2925                                 break;
2926                         case 'numberofedits':
2927                                 $value = $pageLang->formatNum( SiteStats::edits() );
2928                                 break;
2929                         case 'numberofviews':
2930                                 global $wgDisableCounters;
2931                                 $value = !$wgDisableCounters ? $pageLang->formatNum( SiteStats::views() ) : '';
2932                                 break;
2933                         case 'currenttimestamp':
2934                                 $value = wfTimestamp( TS_MW, $ts );
2935                                 break;
2936                         case 'localtimestamp':
2937                                 $value = $localTimestamp;
2938                                 break;
2939                         case 'currentversion':
2940                                 $value = SpecialVersion::getVersion();
2941                                 break;
2942                         case 'articlepath':
2943                                 return $wgArticlePath;
2944                         case 'sitename':
2945                                 return $wgSitename;
2946                         case 'server':
2947                                 return $wgServer;
2948                         case 'servername':
2949                                 $serverParts = wfParseUrl( $wgServer );
2950                                 return $serverParts && isset( $serverParts['host'] ) ? $serverParts['host'] : $wgServer;
2951                         case 'scriptpath':
2952                                 return $wgScriptPath;
2953                         case 'stylepath':
2954                                 return $wgStylePath;
2955                         case 'directionmark':
2956                                 return $pageLang->getDirMark();
2957                         case 'contentlanguage':
2958                                 global $wgLanguageCode;
2959                                 return $wgLanguageCode;
2960                         default:
2961                                 $ret = null;
2962                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) ) {
2963                                         return $ret;
2964                                 } else {
2965                                         return null;
2966                                 }
2967                 }
2968
2969                 if ( $index ) {
2970                         $this->mVarCache[$index] = $value;
2971                 }
2972
2973                 return $value;
2974         }
2975
2976         /**
2977          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2978          *
2979          * @private
2980          */
2981         function initialiseVariables() {
2982                 wfProfileIn( __METHOD__ );
2983                 $variableIDs = MagicWord::getVariableIDs();
2984                 $substIDs = MagicWord::getSubstIDs();
2985
2986                 $this->mVariables = new MagicWordArray( $variableIDs );
2987                 $this->mSubstWords = new MagicWordArray( $substIDs );
2988                 wfProfileOut( __METHOD__ );
2989         }
2990
2991         /**
2992          * Preprocess some wikitext and return the document tree.
2993          * This is the ghost of replace_variables().
2994          *
2995          * @param string $text The text to parse
2996          * @param $flags Integer: bitwise combination of:
2997          *          self::PTD_FOR_INCLUSION    Handle "<noinclude>" and "<includeonly>" as if the text is being
2998          *                                     included. Default is to assume a direct page view.
2999          *
3000          * The generated DOM tree must depend only on the input text and the flags.
3001          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
3002          *
3003          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
3004          * change in the DOM tree for a given text, must be passed through the section identifier
3005          * in the section edit link and thus back to extractSections().
3006          *
3007          * The output of this function is currently only cached in process memory, but a persistent
3008          * cache may be implemented at a later date which takes further advantage of these strict
3009          * dependency requirements.
3010          *
3011          * @private
3012          *
3013          * @return PPNode
3014          */
3015         function preprocessToDom( $text, $flags = 0 ) {
3016                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
3017                 return $dom;
3018         }
3019
3020         /**
3021          * Return a three-element array: leading whitespace, string contents, trailing whitespace
3022          *
3023          * @param $s string
3024          *
3025          * @return array
3026          */
3027         public static function splitWhitespace( $s ) {
3028                 $ltrimmed = ltrim( $s );
3029                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
3030                 $trimmed = rtrim( $ltrimmed );
3031                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
3032                 if ( $diff > 0 ) {
3033                         $w2 = substr( $ltrimmed, -$diff );
3034                 } else {
3035                         $w2 = '';
3036                 }
3037                 return array( $w1, $trimmed, $w2 );
3038         }
3039
3040         /**
3041          * Replace magic variables, templates, and template arguments
3042          * with the appropriate text. Templates are substituted recursively,
3043          * taking care to avoid infinite loops.
3044          *
3045          * Note that the substitution depends on value of $mOutputType:
3046          *  self::OT_WIKI: only {{subst:}} templates
3047          *  self::OT_PREPROCESS: templates but not extension tags
3048          *  self::OT_HTML: all templates and extension tags
3049          *
3050          * @param string $text the text to transform
3051          * @param $frame PPFrame Object describing the arguments passed to the template.
3052          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
3053          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
3054          * @param $argsOnly Boolean only do argument (triple-brace) expansion, not double-brace expansion
3055          * @private
3056          *
3057          * @return string
3058          */
3059         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
3060                 # Is there any text? Also, Prevent too big inclusions!
3061                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
3062                         return $text;
3063                 }
3064                 wfProfileIn( __METHOD__ );
3065
3066                 if ( $frame === false ) {
3067                         $frame = $this->getPreprocessor()->newFrame();
3068                 } elseif ( !( $frame instanceof PPFrame ) ) {
3069                         wfDebug( __METHOD__ . " called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
3070                         $frame = $this->getPreprocessor()->newCustomFrame( $frame );
3071                 }
3072
3073                 $dom = $this->preprocessToDom( $text );
3074                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
3075                 $text = $frame->expand( $dom, $flags );
3076
3077                 wfProfileOut( __METHOD__ );
3078                 return $text;
3079         }
3080
3081         /**
3082          * Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
3083          *
3084          * @param $args array
3085          *
3086          * @return array
3087          */
3088         static function createAssocArgs( $args ) {
3089                 $assocArgs = array();
3090                 $index = 1;
3091                 foreach ( $args as $arg ) {
3092                         $eqpos = strpos( $arg, '=' );
3093                         if ( $eqpos === false ) {
3094                                 $assocArgs[$index++] = $arg;
3095                         } else {
3096                                 $name = trim( substr( $arg, 0, $eqpos ) );
3097                                 $value = trim( substr( $arg, $eqpos + 1 ) );
3098                                 if ( $value === false ) {
3099                                         $value = '';
3100                                 }
3101                                 if ( $name !== false ) {
3102                                         $assocArgs[$name] = $value;
3103                                 }
3104                         }
3105                 }
3106
3107                 return $assocArgs;
3108         }
3109
3110         /**
3111          * Warn the user when a parser limitation is reached
3112          * Will warn at most once the user per limitation type
3113          *
3114          * @param string $limitationType should be one of:
3115          *   'expensive-parserfunction' (corresponding messages:
3116          *       'expensive-parserfunction-warning',
3117          *       'expensive-parserfunction-category')
3118          *   'post-expand-template-argument' (corresponding messages:
3119          *       'post-expand-template-argument-warning',
3120          *       'post-expand-template-argument-category')
3121          *   'post-expand-template-inclusion' (corresponding messages:
3122          *       'post-expand-template-inclusion-warning',
3123          *       'post-expand-template-inclusion-category')
3124          * @param int|null $current Current value
3125          * @param int|null $max Maximum allowed, when an explicit limit has been
3126          *       exceeded, provide the values (optional)
3127          */
3128         function limitationWarn( $limitationType, $current = '', $max = '' ) {
3129                 # does no harm if $current and $max are present but are unnecessary for the message
3130                 $warning = wfMessage( "$limitationType-warning" )->numParams( $current, $max )
3131                         ->inContentLanguage()->escaped();
3132                 $this->mOutput->addWarning( $warning );
3133                 $this->addTrackingCategory( "$limitationType-category" );
3134         }
3135
3136         /**
3137          * Return the text of a template, after recursively
3138          * replacing any variables or templates within the template.
3139          *
3140          * @param array $piece the parts of the template
3141          *  $piece['title']: the title, i.e. the part before the |
3142          *  $piece['parts']: the parameter array
3143          *  $piece['lineStart']: whether the brace was at the start of a line
3144          * @param $frame PPFrame The current frame, contains template arguments
3145          * @throws MWException
3146          * @return String: the text of the template
3147          * @private
3148          */
3149         function braceSubstitution( $piece, $frame ) {
3150                 wfProfileIn( __METHOD__ );
3151                 wfProfileIn( __METHOD__ . '-setup' );
3152
3153                 # Flags
3154                 $found = false;             # $text has been filled
3155                 $nowiki = false;            # wiki markup in $text should be escaped
3156                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
3157                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
3158                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
3159                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
3160
3161                 # Title object, where $text came from
3162                 $title = false;
3163
3164                 # $part1 is the bit before the first |, and must contain only title characters.
3165                 # Various prefixes will be stripped from it later.
3166                 $titleWithSpaces = $frame->expand( $piece['title'] );
3167                 $part1 = trim( $titleWithSpaces );
3168                 $titleText = false;
3169
3170                 # Original title text preserved for various purposes
3171                 $originalTitle = $part1;
3172
3173                 # $args is a list of argument nodes, starting from index 0, not including $part1
3174                 # @todo FIXME: If piece['parts'] is null then the call to getLength() below won't work b/c this $args isn't an object
3175                 $args = ( null == $piece['parts'] ) ? array() : $piece['parts'];
3176                 wfProfileOut( __METHOD__ . '-setup' );
3177
3178                 $titleProfileIn = null; // profile templates
3179
3180                 # SUBST
3181                 wfProfileIn( __METHOD__ . '-modifiers' );
3182                 if ( !$found ) {
3183
3184                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
3185
3186                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
3187                         # Decide whether to expand template or keep wikitext as-is.
3188                         if ( $this->ot['wiki'] ) {
3189                                 if ( $substMatch === false ) {
3190                                         $literal = true;  # literal when in PST with no prefix
3191                                 } else {
3192                                         $literal = false; # expand when in PST with subst: or safesubst:
3193                                 }
3194                         } else {
3195                                 if ( $substMatch == 'subst' ) {
3196                                         $literal = true;  # literal when not in PST with plain subst:
3197                                 } else {
3198                                         $literal = false; # expand when not in PST with safesubst: or no prefix
3199                                 }
3200                         }
3201                         if ( $literal ) {
3202                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3203                                 $isLocalObj = true;
3204                                 $found = true;
3205                         }
3206                 }
3207
3208                 # Variables
3209                 if ( !$found && $args->getLength() == 0 ) {
3210                         $id = $this->mVariables->matchStartToEnd( $part1 );
3211                         if ( $id !== false ) {
3212                                 $text = $this->getVariableValue( $id, $frame );
3213                                 if ( MagicWord::getCacheTTL( $id ) > -1 ) {
3214                                         $this->mOutput->updateCacheExpiry( MagicWord::getCacheTTL( $id ) );
3215                                 }
3216                                 $found = true;
3217                         }
3218                 }
3219
3220                 # MSG, MSGNW and RAW
3221                 if ( !$found ) {
3222                         # Check for MSGNW:
3223                         $mwMsgnw = MagicWord::get( 'msgnw' );
3224                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3225                                 $nowiki = true;
3226                         } else {
3227                                 # Remove obsolete MSG:
3228                                 $mwMsg = MagicWord::get( 'msg' );
3229                                 $mwMsg->matchStartAndRemove( $part1 );
3230                         }
3231
3232                         # Check for RAW:
3233                         $mwRaw = MagicWord::get( 'raw' );
3234                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3235                                 $forceRawInterwiki = true;
3236                         }
3237                 }
3238                 wfProfileOut( __METHOD__ . '-modifiers' );
3239
3240                 # Parser functions
3241                 if ( !$found ) {
3242                         wfProfileIn( __METHOD__ . '-pfunc' );
3243
3244                         $colonPos = strpos( $part1, ':' );
3245                         if ( $colonPos !== false ) {
3246                                 $func = substr( $part1, 0, $colonPos );
3247                                 $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
3248                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
3249                                         $funcArgs[] = $args->item( $i );
3250                                 }
3251                                 try {
3252                                         $result = $this->callParserFunction( $frame, $func, $funcArgs );
3253                                 } catch ( Exception $ex ) {
3254                                         wfProfileOut( __METHOD__ . '-pfunc' );
3255                                         wfProfileOut( __METHOD__ );
3256                                         throw $ex;
3257                                 }
3258
3259                                 # The interface for parser functions allows for extracting
3260                                 # flags into the local scope. Extract any forwarded flags
3261                                 # here.
3262                                 extract( $result );
3263                         }
3264                         wfProfileOut( __METHOD__ . '-pfunc' );
3265                 }
3266
3267                 # Finish mangling title and then check for loops.
3268                 # Set $title to a Title object and $titleText to the PDBK
3269                 if ( !$found ) {
3270                         $ns = NS_TEMPLATE;
3271                         # Split the title into page and subpage
3272                         $subpage = '';
3273                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3274                         if ( $subpage !== '' ) {
3275                                 $ns = $this->mTitle->getNamespace();
3276                         }
3277                         $title = Title::newFromText( $part1, $ns );
3278                         if ( $title ) {
3279                                 $titleText = $title->getPrefixedText();
3280                                 # Check for language variants if the template is not found
3281                                 if ( $this->getConverterLanguage()->hasVariants() && $title->getArticleID() == 0 ) {
3282                                         $this->getConverterLanguage()->findVariantLink( $part1, $title, true );
3283                                 }
3284                                 # Do recursion depth check
3285                                 $limit = $this->mOptions->getMaxTemplateDepth();
3286                                 if ( $frame->depth >= $limit ) {
3287                                         $found = true;
3288                                         $text = '<span class="error">'
3289                                                 . wfMessage( 'parser-template-recursion-depth-warning' )
3290                                                         ->numParams( $limit )->inContentLanguage()->text()
3291                                                 . '</span>';
3292                                 }
3293                         }
3294                 }
3295
3296                 # Load from database
3297                 if ( !$found && $title ) {
3298                         if ( !Profiler::instance()->isPersistent() ) {
3299                                 # Too many unique items can kill profiling DBs/collectors
3300                                 $titleProfileIn = __METHOD__ . "-title-" . $title->getDBkey();
3301                                 wfProfileIn( $titleProfileIn ); // template in
3302                         }
3303                         wfProfileIn( __METHOD__ . '-loadtpl' );
3304                         if ( !$title->isExternal() ) {
3305                                 if ( $title->isSpecialPage()
3306                                         && $this->mOptions->getAllowSpecialInclusion()
3307                                         && $this->ot['html'] )
3308                                 {
3309                                         // Pass the template arguments as URL parameters.
3310                                         // "uselang" will have no effect since the Language object
3311                                         // is forced to the one defined in ParserOptions.
3312                                         $pageArgs = array();
3313                                         for ( $i = 0; $i < $args->getLength(); $i++ ) {
3314                                                 $bits = $args->item( $i )->splitArg();
3315                                                 if ( strval( $bits['index'] ) === '' ) {
3316                                                         $name = trim( $frame->expand( $bits['name'], PPFrame::STRIP_COMMENTS ) );
3317                                                         $value = trim( $frame->expand( $bits['value'] ) );
3318                                                         $pageArgs[$name] = $value;
3319                                                 }
3320                                         }
3321
3322                                         // Create a new context to execute the special page
3323                                         $context = new RequestContext;
3324                                         $context->setTitle( $title );
3325                                         $context->setRequest( new FauxRequest( $pageArgs ) );
3326                                         $context->setUser( $this->getUser() );
3327                                         $context->setLanguage( $this->mOptions->getUserLangObj() );
3328                                         $ret = SpecialPageFactory::capturePath( $title, $context );
3329                                         if ( $ret ) {
3330                                                 $text = $context->getOutput()->getHTML();
3331                                                 $this->mOutput->addOutputPageMetadata( $context->getOutput() );
3332                                                 $found = true;
3333                                                 $isHTML = true;
3334                                                 $this->disableCache();
3335                                         }
3336                                 } elseif ( MWNamespace::isNonincludable( $title->getNamespace() ) ) {
3337                                         $found = false; # access denied
3338                                         wfDebug( __METHOD__ . ": template inclusion denied for " . $title->getPrefixedDBkey() );
3339                                 } else {
3340                                         list( $text, $title ) = $this->getTemplateDom( $title );
3341                                         if ( $text !== false ) {
3342                                                 $found = true;
3343                                                 $isChildObj = true;
3344                                         }
3345                                 }
3346
3347                                 # If the title is valid but undisplayable, make a link to it
3348                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3349                                         $text = "[[:$titleText]]";
3350                                         $found = true;
3351                                 }
3352                         } elseif ( $title->isTrans() ) {
3353                                 # Interwiki transclusion
3354                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3355                                         $text = $this->interwikiTransclude( $title, 'render' );
3356                                         $isHTML = true;
3357                                 } else {
3358                                         $text = $this->interwikiTransclude( $title, 'raw' );
3359                                         # Preprocess it like a template
3360                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3361                                         $isChildObj = true;
3362                                 }
3363                                 $found = true;
3364                         }
3365
3366                         # Do infinite loop check
3367                         # This has to be done after redirect resolution to avoid infinite loops via redirects
3368                         if ( !$frame->loopCheck( $title ) ) {
3369                                 $found = true;
3370                                 $text = '<span class="error">'
3371                                         . wfMessage( 'parser-template-loop-warning', $titleText )->inContentLanguage()->text()
3372                                         . '</span>';
3373                                 wfDebug( __METHOD__ . ": template loop broken at '$titleText'\n" );
3374                         }
3375                         wfProfileOut( __METHOD__ . '-loadtpl' );
3376                 }
3377
3378                 # If we haven't found text to substitute by now, we're done
3379                 # Recover the source wikitext and return it
3380                 if ( !$found ) {
3381                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3382                         if ( $titleProfileIn ) {
3383                                 wfProfileOut( $titleProfileIn ); // template out
3384                         }
3385                         wfProfileOut( __METHOD__ );
3386                         return array( 'object' => $text );
3387                 }
3388
3389                 # Expand DOM-style return values in a child frame
3390                 if ( $isChildObj ) {
3391                         # Clean up argument array
3392                         $newFrame = $frame->newChild( $args, $title );
3393
3394                         if ( $nowiki ) {
3395                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3396                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3397                                 # Expansion is eligible for the empty-frame cache
3398                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3399                                         $text = $this->mTplExpandCache[$titleText];
3400                                 } else {
3401                                         $text = $newFrame->expand( $text );
3402                                         $this->mTplExpandCache[$titleText] = $text;
3403                                 }
3404                         } else {
3405                                 # Uncached expansion
3406                                 $text = $newFrame->expand( $text );
3407                         }
3408                 }
3409                 if ( $isLocalObj && $nowiki ) {
3410                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3411                         $isLocalObj = false;
3412                 }
3413
3414                 if ( $titleProfileIn ) {
3415                         wfProfileOut( $titleProfileIn ); // template out
3416                 }
3417
3418                 # Replace raw HTML by a placeholder
3419                 if ( $isHTML ) {
3420                         $text = $this->insertStripItem( $text );
3421                 } elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3422                         # Escape nowiki-style return values
3423                         $text = wfEscapeWikiText( $text );
3424                 } elseif ( is_string( $text )
3425                         && !$piece['lineStart']
3426                         && preg_match( '/^(?:{\\||:|;|#|\*)/', $text ) )
3427                 {
3428                         # Bug 529: if the template begins with a table or block-level
3429                         # element, it should be treated as beginning a new line.
3430                         # This behavior is somewhat controversial.
3431                         $text = "\n" . $text;
3432                 }
3433
3434                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3435                         # Error, oversize inclusion
3436                         if ( $titleText !== false ) {
3437                                 # Make a working, properly escaped link if possible (bug 23588)
3438                                 $text = "[[:$titleText]]";
3439                         } else {
3440                                 # This will probably not be a working link, but at least it may
3441                                 # provide some hint of where the problem is
3442                                 preg_replace( '/^:/', '', $originalTitle );
3443                                 $text = "[[:$originalTitle]]";
3444                         }
3445                         $text .= $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3446                         $this->limitationWarn( 'post-expand-template-inclusion' );
3447                 }
3448
3449                 if ( $isLocalObj ) {
3450                         $ret = array( 'object' => $text );
3451                 } else {
3452                         $ret = array( 'text' => $text );
3453                 }
3454
3455                 wfProfileOut( __METHOD__ );
3456                 return $ret;
3457         }
3458
3459         /**
3460          * Call a parser function and return an array with text and flags.
3461          *
3462          * The returned array will always contain a boolean 'found', indicating
3463          * whether the parser function was found or not. It may also contain the
3464          * following:
3465          *  text: string|object, resulting wikitext or PP DOM object
3466          *  isHTML: bool, $text is HTML, armour it against wikitext transformation
3467          *  isChildObj: bool, $text is a DOM node needing expansion in a child frame
3468          *  isLocalObj: bool, $text is a DOM node needing expansion in the current frame
3469          *  nowiki: bool, wiki markup in $text should be escaped
3470          *
3471          * @since 1.21
3472          * @param $frame PPFrame The current frame, contains template arguments
3473          * @param $function string Function name
3474          * @param $args array Arguments to the function
3475          * @return array
3476          */
3477         public function callParserFunction( $frame, $function, array $args = array() ) {
3478                 global $wgContLang;
3479
3480                 wfProfileIn( __METHOD__ );
3481
3482                 # Case sensitive functions
3483                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3484                         $function = $this->mFunctionSynonyms[1][$function];
3485                 } else {
3486                         # Case insensitive functions
3487                         $function = $wgContLang->lc( $function );
3488                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3489                                 $function = $this->mFunctionSynonyms[0][$function];
3490                         } else {
3491                                 wfProfileOut( __METHOD__ );
3492                                 return array( 'found' => false );
3493                         }
3494                 }
3495
3496                 wfProfileIn( __METHOD__ . '-pfunc-' . $function );
3497                 list( $callback, $flags ) = $this->mFunctionHooks[$function];
3498
3499                 # Workaround for PHP bug 35229 and similar
3500                 if ( !is_callable( $callback ) ) {
3501                         wfProfileOut( __METHOD__ . '-pfunc-' . $function );
3502                         wfProfileOut( __METHOD__ );
3503                         throw new MWException( "Tag hook for $function is not callable\n" );
3504                 }
3505
3506                 $allArgs = array( &$this );
3507                 if ( $flags & SFH_OBJECT_ARGS ) {
3508                         # Convert arguments to PPNodes and collect for appending to $allArgs
3509                         $funcArgs = array();
3510                         foreach ( $args as $k => $v ) {
3511                                 if ( $v instanceof PPNode || $k === 0 ) {
3512                                         $funcArgs[] = $v;
3513                                 } else {
3514                                         $funcArgs[] = $this->mPreprocessor->newPartNodeArray( array( $k => $v ) )->item( 0 );
3515                                 }
3516                         }
3517
3518                         # Add a frame parameter, and pass the arguments as an array
3519                         $allArgs[] = $frame;
3520                         $allArgs[] = $funcArgs;
3521                 } else {
3522                         # Convert arguments to plain text and append to $allArgs
3523                         foreach ( $args as $k => $v ) {
3524                                 if ( $v instanceof PPNode ) {
3525                                         $allArgs[] = trim( $frame->expand( $v ) );
3526                                 } elseif ( is_int( $k ) && $k >= 0 ) {
3527                                         $allArgs[] = trim( $v );
3528                                 } else {
3529                                         $allArgs[] = trim( "$k=$v" );
3530                                 }
3531                         }
3532                 }
3533
3534                 $result = call_user_func_array( $callback, $allArgs );
3535
3536                 # The interface for function hooks allows them to return a wikitext
3537                 # string or an array containing the string and any flags. This mungs
3538                 # things around to match what this method should return.
3539                 if ( !is_array( $result ) ) {
3540                         $result = array(
3541                                 'found' => true,
3542                                 'text' => $result,
3543                         );
3544                 } else {
3545                         if ( isset( $result[0] ) && !isset( $result['text'] ) ) {
3546                                 $result['text'] = $result[0];
3547                         }
3548                         unset( $result[0] );
3549                         $result += array(
3550                                 'found' => true,
3551                         );
3552                 }
3553
3554                 $noparse = true;
3555                 $preprocessFlags = 0;
3556                 if ( isset( $result['noparse'] ) ) {
3557                         $noparse = $result['noparse'];
3558                 }
3559                 if ( isset( $result['preprocessFlags'] ) ) {
3560                         $preprocessFlags = $result['preprocessFlags'];
3561                 }
3562
3563                 if ( !$noparse ) {
3564                         $result['text'] = $this->preprocessToDom( $result['text'], $preprocessFlags );
3565                         $result['isChildObj'] = true;
3566                 }
3567                 wfProfileOut( __METHOD__ . '-pfunc-' . $function );
3568                 wfProfileOut( __METHOD__ );
3569
3570                 return $result;
3571         }
3572
3573         /**
3574          * Get the semi-parsed DOM representation of a template with a given title,
3575          * and its redirect destination title. Cached.
3576          *
3577          * @param $title Title
3578          *
3579          * @return array
3580          */
3581         function getTemplateDom( $title ) {
3582                 $cacheTitle = $title;
3583                 $titleText = $title->getPrefixedDBkey();
3584
3585                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3586                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3587                         $title = Title::makeTitle( $ns, $dbk );
3588                         $titleText = $title->getPrefixedDBkey();
3589                 }
3590                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3591                         return array( $this->mTplDomCache[$titleText], $title );
3592                 }
3593
3594                 # Cache miss, go to the database
3595                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3596
3597                 if ( $text === false ) {
3598                         $this->mTplDomCache[$titleText] = false;
3599                         return array( false, $title );
3600                 }
3601
3602                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3603                 $this->mTplDomCache[$titleText] = $dom;
3604
3605                 if ( !$title->equals( $cacheTitle ) ) {
3606                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3607                                 array( $title->getNamespace(), $cdb = $title->getDBkey() );
3608                 }
3609
3610                 return array( $dom, $title );
3611         }
3612
3613         /**
3614          * Fetch the unparsed text of a template and register a reference to it.
3615          * @param Title $title
3616          * @return Array ( string or false, Title )
3617          */
3618         function fetchTemplateAndTitle( $title ) {
3619                 $templateCb = $this->mOptions->getTemplateCallback(); # Defaults to Parser::statelessFetchTemplate()
3620                 $stuff = call_user_func( $templateCb, $title, $this );
3621                 $text = $stuff['text'];
3622                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3623                 if ( isset( $stuff['deps'] ) ) {
3624                         foreach ( $stuff['deps'] as $dep ) {
3625                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3626                         }
3627                 }
3628                 return array( $text, $finalTitle );
3629         }
3630
3631         /**
3632          * Fetch the unparsed text of a template and register a reference to it.
3633          * @param Title $title
3634          * @return mixed string or false
3635          */
3636         function fetchTemplate( $title ) {
3637                 $rv = $this->fetchTemplateAndTitle( $title );
3638                 return $rv[0];
3639         }
3640
3641         /**
3642          * Static function to get a template
3643          * Can be overridden via ParserOptions::setTemplateCallback().
3644          *
3645          * @param $title  Title
3646          * @param $parser Parser
3647          *
3648          * @return array
3649          */
3650         static function statelessFetchTemplate( $title, $parser = false ) {
3651                 $text = $skip = false;
3652                 $finalTitle = $title;
3653                 $deps = array();
3654
3655                 # Loop to fetch the article, with up to 1 redirect
3656                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3657                         # Give extensions a chance to select the revision instead
3658                         $id = false; # Assume current
3659                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle',
3660                                 array( $parser, $title, &$skip, &$id ) );
3661
3662                         if ( $skip ) {
3663                                 $text = false;
3664                                 $deps[] = array(
3665                                         'title'         => $title,
3666                                         'page_id'       => $title->getArticleID(),
3667                                         'rev_id'        => null
3668                                 );
3669                                 break;
3670                         }
3671                         # Get the revision
3672                         $rev = $id
3673                                 ? Revision::newFromId( $id )
3674                                 : Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
3675                         $rev_id = $rev ? $rev->getId() : 0;
3676                         # If there is no current revision, there is no page
3677                         if ( $id === false && !$rev ) {
3678                                 $linkCache = LinkCache::singleton();
3679                                 $linkCache->addBadLinkObj( $title );
3680                         }
3681
3682                         $deps[] = array(
3683                                 'title'         => $title,
3684                                 'page_id'       => $title->getArticleID(),
3685                                 'rev_id'        => $rev_id );
3686                         if ( $rev && !$title->equals( $rev->getTitle() ) ) {
3687                                 # We fetched a rev from a different title; register it too...
3688                                 $deps[] = array(
3689                                         'title'         => $rev->getTitle(),
3690                                         'page_id'       => $rev->getPage(),
3691                                         'rev_id'        => $rev_id );
3692                         }
3693
3694                         if ( $rev ) {
3695                                 $content = $rev->getContent();
3696                                 $text = $content ? $content->getWikitextForTransclusion() : null;
3697
3698                                 if ( $text === false || $text === null ) {
3699                                         $text = false;
3700                                         break;
3701                                 }
3702                         } elseif ( $title->getNamespace() == NS_MEDIAWIKI ) {
3703                                 global $wgContLang;
3704                                 $message = wfMessage( $wgContLang->lcfirst( $title->getText() ) )->inContentLanguage();
3705                                 if ( !$message->exists() ) {
3706                                         $text = false;
3707                                         break;
3708                                 }
3709                                 $content = $message->content();
3710                                 $text = $message->plain();
3711                         } else {
3712                                 break;
3713                         }
3714                         if ( !$content ) {
3715                                 break;
3716                         }
3717                         # Redirect?
3718                         $finalTitle = $title;
3719                         $title = $content->getRedirectTarget();
3720                 }
3721                 return array(
3722                         'text' => $text,
3723                         'finalTitle' => $finalTitle,
3724                         'deps' => $deps );
3725         }
3726
3727         /**
3728          * Fetch a file and its title and register a reference to it.
3729          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3730          * @param Title $title
3731          * @param array $options Array of options to RepoGroup::findFile
3732          * @return File|bool
3733          */
3734         function fetchFile( $title, $options = array() ) {
3735                 $res = $this->fetchFileAndTitle( $title, $options );
3736                 return $res[0];
3737         }
3738
3739         /**
3740          * Fetch a file and its title and register a reference to it.
3741          * If 'broken' is a key in $options then the file will appear as a broken thumbnail.
3742          * @param Title $title
3743          * @param array $options Array of options to RepoGroup::findFile
3744          * @return Array ( File or false, Title of file )
3745          */
3746         function fetchFileAndTitle( $title, $options = array() ) {
3747                 if ( isset( $options['broken'] ) ) {
3748                         $file = false; // broken thumbnail forced by hook
3749                 } elseif ( isset( $options['sha1'] ) ) { // get by (sha1,timestamp)
3750                         $file = RepoGroup::singleton()->findFileFromKey( $options['sha1'], $options );
3751                 } else { // get by (name,timestamp)
3752                         $file = wfFindFile( $title, $options );
3753                 }
3754                 $time = $file ? $file->getTimestamp() : false;
3755                 $sha1 = $file ? $file->getSha1() : false;
3756                 # Register the file as a dependency...
3757                 $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3758                 if ( $file && !$title->equals( $file->getTitle() ) ) {
3759                         # Update fetched file title
3760                         $title = $file->getTitle();
3761                         if ( is_null( $file->getRedirectedTitle() ) ) {
3762                                 # This file was not a redirect, but the title does not match.
3763                                 # Register under the new name because otherwise the link will
3764                                 # get lost.
3765                                 $this->mOutput->addImage( $title->getDBkey(), $time, $sha1 );
3766                         }
3767                 }
3768                 return array( $file, $title );
3769         }
3770
3771         /**
3772          * Transclude an interwiki link.
3773          *
3774          * @param $title Title
3775          * @param $action
3776          *
3777          * @return string
3778          */
3779         function interwikiTransclude( $title, $action ) {
3780                 global $wgEnableScaryTranscluding;
3781
3782                 if ( !$wgEnableScaryTranscluding ) {
3783                         return wfMessage( 'scarytranscludedisabled' )->inContentLanguage()->text();
3784                 }
3785
3786                 $url = $title->getFullURL( "action=$action" );
3787
3788                 if ( strlen( $url ) > 255 ) {
3789                         return wfMessage( 'scarytranscludetoolong' )->inContentLanguage()->text();
3790                 }
3791                 return $this->fetchScaryTemplateMaybeFromCache( $url );
3792         }
3793
3794         /**
3795          * @param $url string
3796          * @return Mixed|String
3797          */
3798         function fetchScaryTemplateMaybeFromCache( $url ) {
3799                 global $wgTranscludeCacheExpiry;
3800                 $dbr = wfGetDB( DB_SLAVE );
3801                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3802                 $obj = $dbr->selectRow( 'transcache', array( 'tc_time', 'tc_contents' ),
3803                                 array( 'tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3804                 if ( $obj ) {
3805                         return $obj->tc_contents;
3806                 }
3807
3808                 $req = MWHttpRequest::factory( $url );
3809                 $status = $req->execute(); // Status object
3810                 if ( $status->isOK() ) {
3811                         $text = $req->getContent();
3812                 } elseif ( $req->getStatus() != 200 ) { // Though we failed to fetch the content, this status is useless.
3813                         return wfMessage( 'scarytranscludefailed-httpstatus', $url, $req->getStatus() /* HTTP status */ )->inContentLanguage()->text();
3814                 } else {
3815                         return wfMessage( 'scarytranscludefailed', $url )->inContentLanguage()->text();
3816                 }
3817
3818                 $dbw = wfGetDB( DB_MASTER );
3819                 $dbw->replace( 'transcache', array( 'tc_url' ), array(
3820                         'tc_url' => $url,
3821                         'tc_time' => $dbw->timestamp( time() ),
3822                         'tc_contents' => $text
3823                 ) );
3824                 return $text;
3825         }
3826
3827         /**
3828          * Triple brace replacement -- used for template arguments
3829          * @private
3830          *
3831          * @param $piece array
3832          * @param $frame PPFrame
3833          *
3834          * @return array
3835          */
3836         function argSubstitution( $piece, $frame ) {
3837                 wfProfileIn( __METHOD__ );
3838
3839                 $error = false;
3840                 $parts = $piece['parts'];
3841                 $nameWithSpaces = $frame->expand( $piece['title'] );
3842                 $argName = trim( $nameWithSpaces );
3843                 $object = false;
3844                 $text = $frame->getArgument( $argName );
3845                 if ( $text === false && $parts->getLength() > 0
3846                   && (
3847                         $this->ot['html']
3848                         || $this->ot['pre']
3849                         || ( $this->ot['wiki'] && $frame->isTemplate() )
3850                   )
3851                 ) {
3852                         # No match in frame, use the supplied default
3853                         $object = $parts->item( 0 )->getChildren();
3854                 }
3855                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3856                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3857                         $this->limitationWarn( 'post-expand-template-argument' );
3858                 }
3859
3860                 if ( $text === false && $object === false ) {
3861                         # No match anywhere
3862                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3863                 }
3864                 if ( $error !== false ) {
3865                         $text .= $error;
3866                 }
3867                 if ( $object !== false ) {
3868                         $ret = array( 'object' => $object );
3869                 } else {
3870                         $ret = array( 'text' => $text );
3871                 }
3872
3873                 wfProfileOut( __METHOD__ );
3874                 return $ret;
3875         }
3876
3877         /**
3878          * Return the text to be used for a given extension tag.
3879          * This is the ghost of strip().
3880          *
3881          * @param array $params Associative array of parameters:
3882          *     name       PPNode for the tag name
3883          *     attr       PPNode for unparsed text where tag attributes are thought to be
3884          *     attributes Optional associative array of parsed attributes
3885          *     inner      Contents of extension element
3886          *     noClose    Original text did not have a close tag
3887          * @param $frame PPFrame
3888          *
3889          * @throws MWException
3890          * @return string
3891          */
3892         function extensionSubstitution( $params, $frame ) {
3893                 $name = $frame->expand( $params['name'] );
3894                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3895                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3896                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf( '%08X', $this->mMarkerIndex++ ) . self::MARKER_SUFFIX;
3897
3898                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower( $name )] ) &&
3899                         ( $this->ot['html'] || $this->ot['pre'] );
3900                 if ( $isFunctionTag ) {
3901                         $markerType = 'none';
3902                 } else {
3903                         $markerType = 'general';
3904                 }
3905                 if ( $this->ot['html'] || $isFunctionTag ) {
3906                         $name = strtolower( $name );
3907                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3908                         if ( isset( $params['attributes'] ) ) {
3909                                 $attributes = $attributes + $params['attributes'];
3910                         }
3911
3912                         if ( isset( $this->mTagHooks[$name] ) ) {
3913                                 # Workaround for PHP bug 35229 and similar
3914                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3915                                         throw new MWException( "Tag hook for $name is not callable\n" );
3916                                 }
3917                                 $output = call_user_func_array( $this->mTagHooks[$name],
3918                                         array( $content, $attributes, $this, $frame ) );
3919                         } elseif ( isset( $this->mFunctionTagHooks[$name] ) ) {
3920                                 list( $callback, ) = $this->mFunctionTagHooks[$name];
3921                                 if ( !is_callable( $callback ) ) {
3922                                         throw new MWException( "Tag hook for $name is not callable\n" );
3923                                 }
3924
3925                                 $output = call_user_func_array( $callback, array( &$this, $frame, $content, $attributes ) );
3926                         } else {
3927                                 $output = '<span class="error">Invalid tag extension name: ' .
3928                                         htmlspecialchars( $name ) . '</span>';
3929                         }
3930
3931                         if ( is_array( $output ) ) {
3932                                 # Extract flags to local scope (to override $markerType)
3933                                 $flags = $output;
3934                                 $output = $flags[0];
3935                                 unset( $flags[0] );
3936                                 extract( $flags );
3937                         }
3938                 } else {
3939                         if ( is_null( $attrText ) ) {
3940                                 $attrText = '';
3941                         }
3942                         if ( isset( $params['attributes'] ) ) {
3943                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3944                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3945                                                 htmlspecialchars( $attrValue ) . '"';
3946                                 }
3947                         }
3948                         if ( $content === null ) {
3949                                 $output = "<$name$attrText/>";
3950                         } else {
3951                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3952                                 $output = "<$name$attrText>$content$close";
3953                         }
3954                 }
3955
3956                 if ( $markerType === 'none' ) {
3957                         return $output;
3958                 } elseif ( $markerType === 'nowiki' ) {
3959                         $this->mStripState->addNoWiki( $marker, $output );
3960                 } elseif ( $markerType === 'general' ) {
3961                         $this->mStripState->addGeneral( $marker, $output );
3962                 } else {
3963                         throw new MWException( __METHOD__ . ': invalid marker type' );
3964                 }
3965                 return $marker;
3966         }
3967
3968         /**
3969          * Increment an include size counter
3970          *
3971          * @param string $type the type of expansion
3972          * @param $size Integer: the size of the text
3973          * @return Boolean: false if this inclusion would take it over the maximum, true otherwise
3974          */
3975         function incrementIncludeSize( $type, $size ) {
3976                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3977                         return false;
3978                 } else {
3979                         $this->mIncludeSizes[$type] += $size;
3980                         return true;
3981                 }
3982         }
3983
3984         /**
3985          * Increment the expensive function count
3986          *
3987          * @return Boolean: false if the limit has been exceeded
3988          */
3989         function incrementExpensiveFunctionCount() {
3990                 $this->mExpensiveFunctionCount++;
3991                 return $this->mExpensiveFunctionCount <= $this->mOptions->getExpensiveParserFunctionLimit();
3992         }
3993
3994         /**
3995          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3996          * Fills $this->mDoubleUnderscores, returns the modified text
3997          *
3998          * @param $text string
3999          *
4000          * @return string
4001          */
4002         function doDoubleUnderscore( $text ) {
4003                 wfProfileIn( __METHOD__ );
4004
4005                 # The position of __TOC__ needs to be recorded
4006                 $mw = MagicWord::get( 'toc' );
4007                 if ( $mw->match( $text ) ) {
4008                         $this->mShowToc = true;
4009                         $this->mForceTocPosition = true;
4010
4011                         # Set a placeholder. At the end we'll fill it in with the TOC.
4012                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
4013
4014                         # Only keep the first one.
4015                         $text = $mw->replace( '', $text );
4016                 }
4017
4018                 # Now match and remove the rest of them
4019                 $mwa = MagicWord::getDoubleUnderscoreArray();
4020                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
4021
4022                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
4023                         $this->mOutput->mNoGallery = true;
4024                 }
4025                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
4026                         $this->mShowToc = false;
4027                 }
4028                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
4029                         $this->addTrackingCategory( 'hidden-category-category' );
4030                 }
4031                 # (bug 8068) Allow control over whether robots index a page.
4032                 #
4033                 # @todo FIXME: Bug 14899: __INDEX__ always overrides __NOINDEX__ here!  This
4034                 # is not desirable, the last one on the page should win.
4035                 if ( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
4036                         $this->mOutput->setIndexPolicy( 'noindex' );
4037                         $this->addTrackingCategory( 'noindex-category' );
4038                 }
4039                 if ( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ) {
4040                         $this->mOutput->setIndexPolicy( 'index' );
4041                         $this->addTrackingCategory( 'index-category' );
4042                 }
4043
4044                 # Cache all double underscores in the database
4045                 foreach ( $this->mDoubleUnderscores as $key => $val ) {
4046                         $this->mOutput->setProperty( $key, '' );
4047                 }
4048
4049                 wfProfileOut( __METHOD__ );
4050                 return $text;
4051         }
4052
4053         /**
4054          * Add a tracking category, getting the title from a system message,
4055          * or print a debug message if the title is invalid.
4056          *
4057          * @param string $msg message key
4058          * @return Boolean: whether the addition was successful
4059          */
4060         public function addTrackingCategory( $msg ) {
4061                 if ( $this->mTitle->getNamespace() === NS_SPECIAL ) {
4062                         wfDebug( __METHOD__ . ": Not adding tracking category $msg to special page!\n" );
4063                         return false;
4064                 }
4065                 // Important to parse with correct title (bug 31469)
4066                 $cat = wfMessage( $msg )
4067                         ->title( $this->getTitle() )
4068                         ->inContentLanguage()
4069                         ->text();
4070
4071                 # Allow tracking categories to be disabled by setting them to "-"
4072                 if ( $cat === '-' ) {
4073                         return false;
4074                 }
4075
4076                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
4077                 if ( $containerCategory ) {
4078                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
4079                         return true;
4080                 } else {
4081                         wfDebug( __METHOD__ . ": [[MediaWiki:$msg]] is not a valid title!\n" );
4082                         return false;
4083                 }
4084         }
4085
4086         /**
4087          * This function accomplishes several tasks:
4088          * 1) Auto-number headings if that option is enabled
4089          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
4090          * 3) Add a Table of contents on the top for users who have enabled the option
4091          * 4) Auto-anchor headings
4092          *
4093          * It loops through all headlines, collects the necessary data, then splits up the
4094          * string and re-inserts the newly formatted headlines.
4095          *
4096          * @param $text String
4097          * @param string $origText original, untouched wikitext
4098          * @param $isMain Boolean
4099          * @return mixed|string
4100          * @private
4101          */
4102         function formatHeadings( $text, $origText, $isMain = true ) {
4103                 global $wgMaxTocLevel, $wgHtml5, $wgExperimentalHtmlIds;
4104
4105                 # Inhibit editsection links if requested in the page
4106                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
4107                         $maybeShowEditLink = $showEditLink = false;
4108                 } else {
4109                         $maybeShowEditLink = true; /* Actual presence will depend on ParserOptions option */
4110                         $showEditLink = $this->mOptions->getEditSection();
4111                 }
4112                 if ( $showEditLink ) {
4113                         $this->mOutput->setEditSectionTokens( true );
4114                 }
4115
4116                 # Get all headlines for numbering them and adding funky stuff like [edit]
4117                 # links - this is for later, but we need the number of headlines right now
4118                 $matches = array();
4119                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?' . '>)\s*(?P<header>[\s\S]*?)\s*<\/H[1-6] *>/i', $text, $matches );
4120
4121                 # if there are fewer than 4 headlines in the article, do not show TOC
4122                 # unless it's been explicitly enabled.
4123                 $enoughToc = $this->mShowToc &&
4124                         ( ( $numMatches >= 4 ) || $this->mForceTocPosition );
4125
4126                 # Allow user to stipulate that a page should have a "new section"
4127                 # link added via __NEWSECTIONLINK__
4128                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
4129                         $this->mOutput->setNewSection( true );
4130                 }
4131
4132                 # Allow user to remove the "new section"
4133                 # link via __NONEWSECTIONLINK__
4134                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
4135                         $this->mOutput->hideNewSection( true );
4136                 }
4137
4138                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
4139                 # override above conditions and always show TOC above first header
4140                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
4141                         $this->mShowToc = true;
4142                         $enoughToc = true;
4143                 }
4144
4145                 # headline counter
4146                 $headlineCount = 0;
4147                 $numVisible = 0;
4148
4149                 # Ugh .. the TOC should have neat indentation levels which can be
4150                 # passed to the skin functions. These are determined here
4151                 $toc = '';
4152                 $full = '';
4153                 $head = array();
4154                 $sublevelCount = array();
4155                 $levelCount = array();
4156                 $level = 0;
4157                 $prevlevel = 0;
4158                 $toclevel = 0;
4159                 $prevtoclevel = 0;
4160                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
4161                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
4162                 $oldType = $this->mOutputType;
4163                 $this->setOutputType( self::OT_WIKI );
4164                 $frame = $this->getPreprocessor()->newFrame();
4165                 $root = $this->preprocessToDom( $origText );
4166                 $node = $root->getFirstChild();
4167                 $byteOffset = 0;
4168                 $tocraw = array();
4169                 $refers = array();
4170
4171                 foreach ( $matches[3] as $headline ) {
4172                         $isTemplate = false;
4173                         $titleText = false;
4174                         $sectionIndex = false;
4175                         $numbering = '';
4176                         $markerMatches = array();
4177                         if ( preg_match( "/^$markerRegex/", $headline, $markerMatches ) ) {
4178                                 $serial = $markerMatches[1];
4179                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
4180                                 $isTemplate = ( $titleText != $baseTitleText );
4181                                 $headline = preg_replace( "/^$markerRegex\\s*/", "", $headline );
4182                         }
4183
4184                         if ( $toclevel ) {
4185                                 $prevlevel = $level;
4186                         }
4187                         $level = $matches[1][$headlineCount];
4188
4189                         if ( $level > $prevlevel ) {
4190                                 # Increase TOC level
4191                                 $toclevel++;
4192                                 $sublevelCount[$toclevel] = 0;
4193                                 if ( $toclevel < $wgMaxTocLevel ) {
4194                                         $prevtoclevel = $toclevel;
4195                                         $toc .= Linker::tocIndent();
4196                                         $numVisible++;
4197                                 }
4198                         } elseif ( $level < $prevlevel && $toclevel > 1 ) {
4199                                 # Decrease TOC level, find level to jump to
4200
4201                                 for ( $i = $toclevel; $i > 0; $i-- ) {
4202                                         if ( $levelCount[$i] == $level ) {
4203                                                 # Found last matching level
4204                                                 $toclevel = $i;
4205                                                 break;
4206                                         } elseif ( $levelCount[$i] < $level ) {
4207                                                 # Found first matching level below current level
4208                                                 $toclevel = $i + 1;
4209                                                 break;
4210                                         }
4211                                 }
4212                                 if ( $i == 0 ) {
4213                                         $toclevel = 1;
4214                                 }
4215                                 if ( $toclevel < $wgMaxTocLevel ) {
4216                                         if ( $prevtoclevel < $wgMaxTocLevel ) {
4217                                                 # Unindent only if the previous toc level was shown :p
4218                                                 $toc .= Linker::tocUnindent( $prevtoclevel - $toclevel );
4219                                                 $prevtoclevel = $toclevel;
4220                                         } else {
4221                                                 $toc .= Linker::tocLineEnd();
4222                                         }
4223                                 }
4224                         } else {
4225                                 # No change in level, end TOC line
4226                                 if ( $toclevel < $wgMaxTocLevel ) {
4227                                         $toc .= Linker::tocLineEnd();
4228                                 }
4229                         }
4230
4231                         $levelCount[$toclevel] = $level;
4232
4233                         # count number of headlines for each level
4234                         $sublevelCount[$toclevel]++;
4235                         $dot = 0;
4236                         for( $i = 1; $i <= $toclevel; $i++ ) {
4237                                 if ( !empty( $sublevelCount[$i] ) ) {
4238                                         if ( $dot ) {
4239                                                 $numbering .= '.';
4240                                         }
4241                                         $numbering .= $this->getTargetLanguage()->formatNum( $sublevelCount[$i] );
4242                                         $dot = 1;
4243                                 }
4244                         }
4245
4246                         # The safe header is a version of the header text safe to use for links
4247
4248                         # Remove link placeholders by the link text.
4249                         #     <!--LINK number-->
4250                         # turns into
4251                         #     link text with suffix
4252                         # Do this before unstrip since link text can contain strip markers
4253                         $safeHeadline = $this->replaceLinkHoldersText( $headline );
4254
4255                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
4256                         $safeHeadline = $this->mStripState->unstripBoth( $safeHeadline );
4257
4258                         # Strip out HTML (first regex removes any tag not allowed)
4259                         # Allowed tags are:
4260                         # * <sup> and <sub> (bug 8393)
4261                         # * <i> (bug 26375)
4262                         # * <b> (r105284)
4263                         # * <span dir="rtl"> and <span dir="ltr"> (bug 35167)
4264                         #
4265                         # We strip any parameter from accepted tags (second regex), except dir="rtl|ltr" from <span>,
4266                         # to allow setting directionality in toc items.
4267                         $tocline = preg_replace(
4268                                 array( '#<(?!/?(span|sup|sub|i|b)(?: [^>]*)?>).*?' . '>#', '#<(/?(?:span(?: dir="(?:rtl|ltr)")?|sup|sub|i|b))(?: .*?)?' . '>#' ),
4269                                 array( '', '<$1>' ),
4270                                 $safeHeadline
4271                         );
4272                         $tocline = trim( $tocline );
4273
4274                         # For the anchor, strip out HTML-y stuff period
4275                         $safeHeadline = preg_replace( '/<.*?' . '>/', '', $safeHeadline );
4276                         $safeHeadline = Sanitizer::normalizeSectionNameWhitespace( $safeHeadline );
4277
4278                         # Save headline for section edit hint before it's escaped
4279                         $headlineHint = $safeHeadline;
4280
4281                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
4282                                 # For reverse compatibility, provide an id that's
4283                                 # HTML4-compatible, like we used to.
4284                                 #
4285                                 # It may be worth noting, academically, that it's possible for
4286                                 # the legacy anchor to conflict with a non-legacy headline
4287                                 # anchor on the page.  In this case likely the "correct" thing
4288                                 # would be to either drop the legacy anchors or make sure
4289                                 # they're numbered first.  However, this would require people
4290                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
4291                                 # manually, so let's not bother worrying about it.
4292                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
4293                                         array( 'noninitial', 'legacy' ) );
4294                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
4295
4296                                 if ( $legacyHeadline == $safeHeadline ) {
4297                                         # No reason to have both (in fact, we can't)
4298                                         $legacyHeadline = false;
4299                                 }
4300                         } else {
4301                                 $legacyHeadline = false;
4302                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
4303                                         'noninitial' );
4304                         }
4305
4306                         # HTML names must be case-insensitively unique (bug 10721).
4307                         # This does not apply to Unicode characters per
4308                         # http://dev.w3.org/html5/spec/infrastructure.html#case-sensitivity-and-string-comparison
4309                         # @todo FIXME: We may be changing them depending on the current locale.
4310                         $arrayKey = strtolower( $safeHeadline );
4311                         if ( $legacyHeadline === false ) {
4312                                 $legacyArrayKey = false;
4313                         } else {
4314                                 $legacyArrayKey = strtolower( $legacyHeadline );
4315                         }
4316
4317                         # count how many in assoc. array so we can track dupes in anchors
4318                         if ( isset( $refers[$arrayKey] ) ) {
4319                                 $refers[$arrayKey]++;
4320                         } else {
4321                                 $refers[$arrayKey] = 1;
4322                         }
4323                         if ( isset( $refers[$legacyArrayKey] ) ) {
4324                                 $refers[$legacyArrayKey]++;
4325                         } else {
4326                                 $refers[$legacyArrayKey] = 1;
4327                         }
4328
4329                         # Don't number the heading if it is the only one (looks silly)
4330                         if ( count( $matches[3] ) > 1 && $this->mOptions->getNumberHeadings() ) {
4331                                 # the two are different if the line contains a link
4332                                 $headline = Html::element( 'span', array( 'class' => 'mw-headline-number' ), $numbering ) . ' ' . $headline;
4333                         }
4334
4335                         # Create the anchor for linking from the TOC to the section
4336                         $anchor = $safeHeadline;
4337                         $legacyAnchor = $legacyHeadline;
4338                         if ( $refers[$arrayKey] > 1 ) {
4339                                 $anchor .= '_' . $refers[$arrayKey];
4340                         }
4341                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
4342                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
4343                         }
4344                         if ( $enoughToc && ( !isset( $wgMaxTocLevel ) || $toclevel < $wgMaxTocLevel ) ) {
4345                                 $toc .= Linker::tocLine( $anchor, $tocline,
4346                                         $numbering, $toclevel, ( $isTemplate ? false : $sectionIndex ) );
4347                         }
4348
4349                         # Add the section to the section tree
4350                         # Find the DOM node for this header
4351                         while ( $node && !$isTemplate ) {
4352                                 if ( $node->getName() === 'h' ) {
4353                                         $bits = $node->splitHeading();
4354                                         if ( $bits['i'] == $sectionIndex ) {
4355                                                 break;
4356                                         }
4357                                 }
4358                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
4359                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
4360                                 $node = $node->getNextSibling();
4361                         }
4362                         $tocraw[] = array(
4363                                 'toclevel' => $toclevel,
4364                                 'level' => $level,
4365                                 'line' => $tocline,
4366                                 'number' => $numbering,
4367                                 'index' => ( $isTemplate ? 'T-' : '' ) . $sectionIndex,
4368                                 'fromtitle' => $titleText,
4369                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
4370                                 'anchor' => $anchor,
4371                         );
4372
4373                         # give headline the correct <h#> tag
4374                         if ( $maybeShowEditLink && $sectionIndex !== false ) {
4375                                 // Output edit section links as markers with styles that can be customized by skins
4376                                 if ( $isTemplate ) {
4377                                         # Put a T flag in the section identifier, to indicate to extractSections()
4378                                         # that sections inside <includeonly> should be counted.
4379                                         $editlinkArgs = array( $titleText, "T-$sectionIndex"/*, null */ );
4380                                 } else {
4381                                         $editlinkArgs = array( $this->mTitle->getPrefixedText(), $sectionIndex, $headlineHint );
4382                                 }
4383                                 // We use a bit of pesudo-xml for editsection markers. The language converter is run later on
4384                                 // Using a UNIQ style marker leads to the converter screwing up the tokens when it converts stuff
4385                                 // And trying to insert strip tags fails too. At this point all real inputted tags have already been escaped
4386                                 // so we don't have to worry about a user trying to input one of these markers directly.
4387                                 // We use a page and section attribute to stop the language converter from converting these important bits
4388                                 // of data, but put the headline hint inside a content block because the language converter is supposed to
4389                                 // be able to convert that piece of data.
4390                                 $editlink = '<mw:editsection page="' . htmlspecialchars( $editlinkArgs[0] );
4391                                 $editlink .= '" section="' . htmlspecialchars( $editlinkArgs[1] ) . '"';
4392                                 if ( isset( $editlinkArgs[2] ) ) {
4393                                         $editlink .= '>' . $editlinkArgs[2] . '</mw:editsection>';
4394                                 } else {
4395                                         $editlink .= '/>';
4396                                 }
4397                         } else {
4398                                 $editlink = '';
4399                         }
4400                         $head[$headlineCount] = Linker::makeHeadline( $level,
4401                                 $matches['attrib'][$headlineCount], $anchor, $headline,
4402                                 $editlink, $legacyAnchor );
4403
4404                         $headlineCount++;
4405                 }
4406
4407                 $this->setOutputType( $oldType );
4408
4409                 # Never ever show TOC if no headers
4410                 if ( $numVisible < 1 ) {
4411                         $enoughToc = false;
4412                 }
4413
4414                 if ( $enoughToc ) {
4415                         if ( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
4416                                 $toc .= Linker::tocUnindent( $prevtoclevel - 1 );
4417                         }
4418                         $toc = Linker::tocList( $toc, $this->mOptions->getUserLangObj() );
4419                         $this->mOutput->setTOCHTML( $toc );
4420                 }
4421
4422                 if ( $isMain ) {
4423                         $this->mOutput->setSections( $tocraw );
4424                 }
4425
4426                 # split up and insert constructed headlines
4427                 $blocks = preg_split( '/<H[1-6].*?' . '>[\s\S]*?<\/H[1-6]>/i', $text );
4428                 $i = 0;
4429
4430                 // build an array of document sections
4431                 $sections = array();
4432                 foreach ( $blocks as $block ) {
4433                         // $head is zero-based, sections aren't.
4434                         if ( empty( $head[$i - 1] ) ) {
4435                                 $sections[$i] = $block;
4436                         } else {
4437                                 $sections[$i] = $head[$i - 1] . $block;
4438                         }
4439
4440                         /**
4441                          * Send a hook, one per section.
4442                          * The idea here is to be able to make section-level DIVs, but to do so in a
4443                          * lower-impact, more correct way than r50769
4444                          *
4445                          * $this : caller
4446                          * $section : the section number
4447                          * &$sectionContent : ref to the content of the section
4448                          * $showEditLinks : boolean describing whether this section has an edit link
4449                          */
4450                         wfRunHooks( 'ParserSectionCreate', array( $this, $i, &$sections[$i], $showEditLink ) );
4451
4452                         $i++;
4453                 }
4454
4455                 if ( $enoughToc && $isMain && !$this->mForceTocPosition ) {
4456                         // append the TOC at the beginning
4457                         // Top anchor now in skin
4458                         $sections[0] = $sections[0] . $toc . "\n";
4459                 }
4460
4461                 $full .= join( '', $sections );
4462
4463                 if ( $this->mForceTocPosition ) {
4464                         return str_replace( '<!--MWTOC-->', $toc, $full );
4465                 } else {
4466                         return $full;
4467                 }
4468         }
4469
4470         /**
4471          * Transform wiki markup when saving a page by doing "\r\n" -> "\n"
4472          * conversion, substitting signatures, {{subst:}} templates, etc.
4473          *
4474          * @param string $text the text to transform
4475          * @param $title Title: the Title object for the current article
4476          * @param $user User: the User object describing the current user
4477          * @param $options ParserOptions: parsing options
4478          * @param $clearState Boolean: whether to clear the parser state first
4479          * @return String: the altered wiki markup
4480          */
4481         public function preSaveTransform( $text, Title $title, User $user, ParserOptions $options, $clearState = true ) {
4482                 $this->startParse( $title, $options, self::OT_WIKI, $clearState );
4483                 $this->setUser( $user );
4484
4485                 $pairs = array(
4486                         "\r\n" => "\n",
4487                 );
4488                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
4489                 if( $options->getPreSaveTransform() ) {
4490                         $text = $this->pstPass2( $text, $user );
4491                 }
4492                 $text = $this->mStripState->unstripBoth( $text );
4493
4494                 $this->setUser( null ); #Reset
4495
4496                 return $text;
4497         }
4498
4499         /**
4500          * Pre-save transform helper function
4501          * @private
4502          *
4503          * @param $text string
4504          * @param $user User
4505          *
4506          * @return string
4507          */
4508         function pstPass2( $text, $user ) {
4509                 global $wgContLang, $wgLocaltimezone;
4510
4511                 # Note: This is the timestamp saved as hardcoded wikitext to
4512                 # the database, we use $wgContLang here in order to give
4513                 # everyone the same signature and use the default one rather
4514                 # than the one selected in each user's preferences.
4515                 # (see also bug 12815)
4516                 $ts = $this->mOptions->getTimestamp();
4517                 if ( isset( $wgLocaltimezone ) ) {
4518                         $tz = $wgLocaltimezone;
4519                 } else {
4520                         $tz = date_default_timezone_get();
4521                 }
4522
4523                 $unixts = wfTimestamp( TS_UNIX, $ts );
4524                 $oldtz = date_default_timezone_get();
4525                 date_default_timezone_set( $tz );
4526                 $ts = date( 'YmdHis', $unixts );
4527                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
4528
4529                 # Allow translation of timezones through wiki. date() can return
4530                 # whatever crap the system uses, localised or not, so we cannot
4531                 # ship premade translations.
4532                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
4533                 $msg = wfMessage( $key )->inContentLanguage();
4534                 if ( $msg->exists() ) {
4535                         $tzMsg = $msg->text();
4536                 }
4537
4538                 date_default_timezone_set( $oldtz );
4539
4540                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4541
4542                 # Variable replacement
4543                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4544                 $text = $this->replaceVariables( $text );
4545
4546                 # This works almost by chance, as the replaceVariables are done before the getUserSig(),
4547                 # which may corrupt this parser instance via its wfMessage()->text() call-
4548
4549                 # Signatures
4550                 $sigText = $this->getUserSig( $user );
4551                 $text = strtr( $text, array(
4552                         '~~~~~' => $d,
4553                         '~~~~' => "$sigText $d",
4554                         '~~~' => $sigText
4555                 ) );
4556
4557                 # Context links ("pipe tricks"): [[|name]] and [[name (context)|]]
4558                 $tc = '[' . Title::legalChars() . ']';
4559                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4560
4561                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\))\\|]]/";                   # [[ns:page (context)|]]
4562                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)( ?（$tc+）)\\|]]/";                           # [[ns:page（context）|]] (double-width brackets, added in r40257)
4563                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( ?\\($tc+\\)|)((?:, |，)$tc+|)\\|]]/";         # [[ns:page (context), context|]] (using either single or double-width comma)
4564                 $p2 = "/\[\[\\|($tc+)]]/";                                              # [[|page]] (reverse pipe trick: add context from page title)
4565
4566                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4567                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4568                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4569                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4570
4571                 $t = $this->mTitle->getText();
4572                 $m = array();
4573                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4574                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4575                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4576                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4577                 } else {
4578                         # if there's no context, don't bother duplicating the title
4579                         $text = preg_replace( $p2, '[[\\1]]', $text );
4580                 }
4581
4582                 # Trim trailing whitespace
4583                 $text = rtrim( $text );
4584
4585                 return $text;
4586         }
4587
4588         /**
4589          * Fetch the user's signature text, if any, and normalize to
4590          * validated, ready-to-insert wikitext.
4591          * If you have pre-fetched the nickname or the fancySig option, you can
4592          * specify them here to save a database query.
4593          * Do not reuse this parser instance after calling getUserSig(),
4594          * as it may have changed if it's the $wgParser.
4595          *
4596          * @param $user User
4597          * @param string|bool $nickname nickname to use or false to use user's default nickname
4598          * @param $fancySig Boolean|null whether the nicknname is the complete signature
4599          *                  or null to use default value
4600          * @return string
4601          */
4602         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4603                 global $wgMaxSigChars;
4604
4605                 $username = $user->getName();
4606
4607                 # If not given, retrieve from the user object.
4608                 if ( $nickname === false )
4609                         $nickname = $user->getOption( 'nickname' );
4610
4611                 if ( is_null( $fancySig ) ) {
4612                         $fancySig = $user->getBoolOption( 'fancysig' );
4613                 }
4614
4615                 $nickname = $nickname == null ? $username : $nickname;
4616
4617                 if ( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4618                         $nickname = $username;
4619                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4620                 } elseif ( $fancySig !== false ) {
4621                         # Sig. might contain markup; validate this
4622                         if ( $this->validateSig( $nickname ) !== false ) {
4623                                 # Validated; clean up (if needed) and return it
4624                                 return $this->cleanSig( $nickname, true );
4625                         } else {
4626                                 # Failed to validate; fall back to the default
4627                                 $nickname = $username;
4628                                 wfDebug( __METHOD__ . ": $username has bad XML tags in signature.\n" );
4629                         }
4630                 }
4631
4632                 # Make sure nickname doesnt get a sig in a sig
4633                 $nickname = self::cleanSigInSig( $nickname );
4634
4635                 # If we're still here, make it a link to the user page
4636                 $userText = wfEscapeWikiText( $username );
4637                 $nickText = wfEscapeWikiText( $nickname );
4638                 $msgName = $user->isAnon() ? 'signature-anon' : 'signature';
4639
4640                 return wfMessage( $msgName, $userText, $nickText )->inContentLanguage()->title( $this->getTitle() )->text();
4641         }
4642
4643         /**
4644          * Check that the user's signature contains no bad XML
4645          *
4646          * @param $text String
4647          * @return mixed An expanded string, or false if invalid.
4648          */
4649         function validateSig( $text ) {
4650                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4651         }
4652
4653         /**
4654          * Clean up signature text
4655          *
4656          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4657          * 2) Substitute all transclusions
4658          *
4659          * @param $text String
4660          * @param bool $parsing Whether we're cleaning (preferences save) or parsing
4661          * @return String: signature text
4662          */
4663         public function cleanSig( $text, $parsing = false ) {
4664                 if ( !$parsing ) {
4665                         global $wgTitle;
4666                         $this->startParse( $wgTitle, new ParserOptions, self::OT_PREPROCESS, true );
4667                 }
4668
4669                 # Option to disable this feature
4670                 if ( !$this->mOptions->getCleanSignatures() ) {
4671                         return $text;
4672                 }
4673
4674                 # @todo FIXME: Regex doesn't respect extension tags or nowiki
4675                 #  => Move this logic to braceSubstitution()
4676                 $substWord = MagicWord::get( 'subst' );
4677                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4678                 $substText = '{{' . $substWord->getSynonym( 0 );
4679
4680                 $text = preg_replace( $substRegex, $substText, $text );
4681                 $text = self::cleanSigInSig( $text );
4682                 $dom = $this->preprocessToDom( $text );
4683                 $frame = $this->getPreprocessor()->newFrame();
4684                 $text = $frame->expand( $dom );
4685
4686                 if ( !$parsing ) {
4687                         $text = $this->mStripState->unstripBoth( $text );
4688                 }
4689
4690                 return $text;
4691         }
4692
4693         /**
4694          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4695          *
4696          * @param $text String
4697          * @return String: signature text with /~{3,5}/ removed
4698          */
4699         public static function cleanSigInSig( $text ) {
4700                 $text = preg_replace( '/~{3,5}/', '', $text );
4701                 return $text;
4702         }
4703
4704         /**
4705          * Set up some variables which are usually set up in parse()
4706          * so that an external function can call some class members with confidence
4707          *
4708          * @param $title Title|null
4709          * @param $options ParserOptions
4710          * @param $outputType
4711          * @param $clearState bool
4712          */
4713         public function startExternalParse( Title $title = null, ParserOptions $options, $outputType, $clearState = true ) {
4714                 $this->startParse( $title, $options, $outputType, $clearState );
4715         }
4716
4717         /**
4718          * @param $title Title|null
4719          * @param $options ParserOptions
4720          * @param $outputType
4721          * @param $clearState bool
4722          */
4723         private function startParse( Title $title = null, ParserOptions $options, $outputType, $clearState = true ) {
4724                 $this->setTitle( $title );
4725                 $this->mOptions = $options;
4726                 $this->setOutputType( $outputType );
4727                 if ( $clearState ) {
4728                         $this->clearState();
4729                 }
4730         }
4731
4732         /**
4733          * Wrapper for preprocess()
4734          *
4735          * @param string $text the text to preprocess
4736          * @param $options ParserOptions: options
4737          * @param $title Title object or null to use $wgTitle
4738          * @return String
4739          */
4740         public function transformMsg( $text, $options, $title = null ) {
4741                 static $executing = false;
4742
4743                 # Guard against infinite recursion
4744                 if ( $executing ) {
4745                         return $text;
4746                 }
4747                 $executing = true;
4748
4749                 wfProfileIn( __METHOD__ );
4750                 if ( !$title ) {
4751                         global $wgTitle;
4752                         $title = $wgTitle;
4753                 }
4754
4755                 $text = $this->preprocess( $text, $title, $options );
4756
4757                 $executing = false;
4758                 wfProfileOut( __METHOD__ );
4759                 return $text;
4760         }
4761
4762         /**
4763          * Create an HTML-style tag, e.g. "<yourtag>special text</yourtag>"
4764          * The callback should have the following form:
4765          *    function myParserHook( $text, $params, $parser, $frame ) { ... }
4766          *
4767          * Transform and return $text. Use $parser for any required context, e.g. use
4768          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4769          *
4770          * Hooks may return extended information by returning an array, of which the
4771          * first numbered element (index 0) must be the return string, and all other
4772          * entries are extracted into local variables within an internal function
4773          * in the Parser class.
4774          *
4775          * This interface (introduced r61913) appears to be undocumented, but
4776          * 'markerName' is used by some core tag hooks to override which strip
4777          * array their results are placed in. **Use great caution if attempting
4778          * this interface, as it is not documented and injudicious use could smash
4779          * private variables.**
4780          *
4781          * @param $tag Mixed: the tag to use, e.g. 'hook' for "<hook>"
4782          * @param $callback Mixed: the callback function (and object) to use for the tag
4783          * @throws MWException
4784          * @return Mixed|null The old value of the mTagHooks array associated with the hook
4785          */
4786         public function setHook( $tag, $callback ) {
4787                 $tag = strtolower( $tag );
4788                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4789                         throw new MWException( "Invalid character {$m[0]} in setHook('$tag', ...) call" );
4790                 }
4791                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4792                 $this->mTagHooks[$tag] = $callback;
4793                 if ( !in_array( $tag, $this->mStripList ) ) {
4794                         $this->mStripList[] = $tag;
4795                 }
4796
4797                 return $oldVal;
4798         }
4799
4800         /**
4801          * As setHook(), but letting the contents be parsed.
4802          *
4803          * Transparent tag hooks are like regular XML-style tag hooks, except they
4804          * operate late in the transformation sequence, on HTML instead of wikitext.
4805          *
4806          * This is probably obsoleted by things dealing with parser frames?
4807          * The only extension currently using it is geoserver.
4808          *
4809          * @since 1.10
4810          * @todo better document or deprecate this
4811          *
4812          * @param $tag Mixed: the tag to use, e.g. 'hook' for "<hook>"
4813          * @param $callback Mixed: the callback function (and object) to use for the tag
4814          * @throws MWException
4815          * @return Mixed|null The old value of the mTagHooks array associated with the hook
4816          */
4817         function setTransparentTagHook( $tag, $callback ) {
4818                 $tag = strtolower( $tag );
4819                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) {
4820                         throw new MWException( "Invalid character {$m[0]} in setTransparentHook('$tag', ...) call" );
4821                 }
4822                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4823                 $this->mTransparentTagHooks[$tag] = $callback;
4824
4825                 return $oldVal;
4826         }
4827
4828         /**
4829          * Remove all tag hooks
4830          */
4831         function clearTagHooks() {
4832                 $this->mTagHooks = array();
4833                 $this->mFunctionTagHooks = array();
4834                 $this->mStripList = $this->mDefaultStripList;
4835         }
4836
4837         /**
4838          * Create a function, e.g. {{sum:1|2|3}}
4839          * The callback function should have the form:
4840          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4841          *
4842          * Or with SFH_OBJECT_ARGS:
4843          *    function myParserFunction( $parser, $frame, $args ) { ... }
4844          *
4845          * The callback may either return the text result of the function, or an array with the text
4846          * in element 0, and a number of flags in the other elements. The names of the flags are
4847          * specified in the keys. Valid flags are:
4848          *   found                     The text returned is valid, stop processing the template. This
4849          *                             is on by default.
4850          *   nowiki                    Wiki markup in the return value should be escaped
4851          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4852          *
4853          * @param string $id The magic word ID
4854          * @param $callback Mixed: the callback function (and object) to use
4855          * @param $flags Integer: a combination of the following flags:
4856          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4857          *
4858          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4859          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4860          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4861          *     the arguments, and to control the way they are expanded.
4862          *
4863          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4864          *     arguments, for instance:
4865          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4866          *
4867          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4868          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4869          *     working if/when this is changed.
4870          *
4871          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4872          *     expansion.
4873          *
4874          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4875          *     about the methods available in PPFrame and PPNode.
4876          *
4877          * @throws MWException
4878          * @return string|callback The old callback function for this name, if any
4879          */
4880         public function setFunctionHook( $id, $callback, $flags = 0 ) {
4881                 global $wgContLang;
4882
4883                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4884                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4885
4886                 # Add to function cache
4887                 $mw = MagicWord::get( $id );
4888                 if ( !$mw )
4889                         throw new MWException( __METHOD__ . '() expecting a magic word identifier.' );
4890
4891                 $synonyms = $mw->getSynonyms();
4892                 $sensitive = intval( $mw->isCaseSensitive() );
4893
4894                 foreach ( $synonyms as $syn ) {
4895                         # Case
4896                         if ( !$sensitive ) {
4897                                 $syn = $wgContLang->lc( $syn );
4898                         }
4899                         # Add leading hash
4900                         if ( !( $flags & SFH_NO_HASH ) ) {
4901                                 $syn = '#' . $syn;
4902                         }
4903                         # Remove trailing colon
4904                         if ( substr( $syn, -1, 1 ) === ':' ) {
4905                                 $syn = substr( $syn, 0, -1 );
4906                         }
4907                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4908                 }
4909                 return $oldVal;
4910         }
4911
4912         /**
4913          * Get all registered function hook identifiers
4914          *
4915          * @return Array
4916          */
4917         function getFunctionHooks() {
4918                 return array_keys( $this->mFunctionHooks );
4919         }
4920
4921         /**
4922          * Create a tag function, e.g. "<test>some stuff</test>".
4923          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4924          * Unlike parser functions, their content is not preprocessed.
4925          * @param $tag
4926          * @param $callback
4927          * @param $flags
4928          * @throws MWException
4929          * @return null
4930          */
4931         function setFunctionTagHook( $tag, $callback, $flags ) {
4932                 $tag = strtolower( $tag );
4933                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) throw new MWException( "Invalid character {$m[0]} in setFunctionTagHook('$tag', ...) call" );
4934                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4935                         $this->mFunctionTagHooks[$tag] : null;
4936                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4937
4938                 if ( !in_array( $tag, $this->mStripList ) ) {
4939                         $this->mStripList[] = $tag;
4940                 }
4941
4942                 return $old;
4943         }
4944
4945         /**
4946          * @todo FIXME: Update documentation. makeLinkObj() is deprecated.
4947          * Replace "<!--LINK-->" link placeholders with actual links, in the buffer
4948          * Placeholders created in Skin::makeLinkObj()
4949          *
4950          * @param $text string
4951          * @param $options int
4952          *
4953          * @return array of link CSS classes, indexed by PDBK.
4954          */
4955         function replaceLinkHolders( &$text, $options = 0 ) {
4956                 return $this->mLinkHolders->replace( $text );
4957         }
4958
4959         /**
4960          * Replace "<!--LINK-->" link placeholders with plain text of links
4961          * (not HTML-formatted).
4962          *
4963          * @param $text String
4964          * @return String
4965          */
4966         function replaceLinkHoldersText( $text ) {
4967                 return $this->mLinkHolders->replaceText( $text );
4968         }
4969
4970         /**
4971          * Renders an image gallery from a text with one line per image.
4972          * text labels may be given by using |-style alternative text. E.g.
4973          *   Image:one.jpg|The number "1"
4974          *   Image:tree.jpg|A tree
4975          * given as text will return the HTML of a gallery with two images,
4976          * labeled 'The number "1"' and
4977          * 'A tree'.
4978          *
4979          * @param string $text
4980          * @param array $params
4981          * @return string HTML
4982          */
4983         function renderImageGallery( $text, $params ) {
4984                 $ig = new ImageGallery();
4985                 $ig->setContextTitle( $this->mTitle );
4986                 $ig->setShowBytes( false );
4987                 $ig->setShowFilename( false );
4988                 $ig->setParser( $this );
4989                 $ig->setHideBadImages();
4990                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4991
4992                 if ( isset( $params['showfilename'] ) ) {
4993                         $ig->setShowFilename( true );
4994                 } else {
4995                         $ig->setShowFilename( false );
4996                 }
4997                 if ( isset( $params['caption'] ) ) {
4998                         $caption = $params['caption'];
4999                         $caption = htmlspecialchars( $caption );
5000                         $caption = $this->replaceInternalLinks( $caption );
5001                         $ig->setCaptionHtml( $caption );
5002                 }
5003                 if ( isset( $params['perrow'] ) ) {
5004                         $ig->setPerRow( $params['perrow'] );
5005                 }
5006                 if ( isset( $params['widths'] ) ) {
5007                         $ig->setWidths( $params['widths'] );
5008                 }
5009                 if ( isset( $params['heights'] ) ) {
5010                         $ig->setHeights( $params['heights'] );
5011                 }
5012
5013                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
5014
5015                 $lines = StringUtils::explode( "\n", $text );
5016                 foreach ( $lines as $line ) {
5017                         # match lines like these:
5018                         # Image:someimage.jpg|This is some image
5019                         $matches = array();
5020                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
5021                         # Skip empty lines
5022                         if ( count( $matches ) == 0 ) {
5023                                 continue;
5024                         }
5025
5026                         if ( strpos( $matches[0], '%' ) !== false ) {
5027                                 $matches[1] = rawurldecode( $matches[1] );
5028                         }
5029                         $title = Title::newFromText( $matches[1], NS_FILE );
5030                         if ( is_null( $title ) ) {
5031                                 # Bogus title. Ignore these so we don't bomb out later.
5032                                 continue;
5033                         }
5034
5035                         $label = '';
5036                         $alt = '';
5037                         $link = '';
5038                         if ( isset( $matches[3] ) ) {
5039                                 // look for an |alt= definition while trying not to break existing
5040                                 // captions with multiple pipes (|) in it, until a more sensible grammar
5041                                 // is defined for images in galleries
5042
5043                                 $matches[3] = $this->recursiveTagParse( trim( $matches[3] ) );
5044                                 $parameterMatches = StringUtils::explode( '|', $matches[3] );
5045                                 $magicWordAlt = MagicWord::get( 'img_alt' );
5046                                 $magicWordLink = MagicWord::get( 'img_link' );
5047
5048                                 foreach ( $parameterMatches as $parameterMatch ) {
5049                                         if ( $match = $magicWordAlt->matchVariableStartToEnd( $parameterMatch ) ) {
5050                                                 $alt = $this->stripAltText( $match, false );
5051                                         }
5052                                         elseif( $match = $magicWordLink->matchVariableStartToEnd( $parameterMatch ) ) {
5053                                                 $linkValue = strip_tags( $this->replaceLinkHoldersText( $match ) );
5054                                                 $chars = self::EXT_LINK_URL_CLASS;
5055                                                 $prots = $this->mUrlProtocols;
5056                                                 //check to see if link matches an absolute url, if not then it must be a wiki link.
5057                                                 if ( preg_match( "/^($prots)$chars+$/u", $linkValue ) ) {
5058                                                         $link = $linkValue;
5059                                                 } else {
5060                                                         $localLinkTitle = Title::newFromText( $linkValue );
5061                                                         if ( $localLinkTitle !== null ) {
5062                                                                 $link = $localLinkTitle->getLocalURL();
5063                                                         }
5064                                                 }
5065                                         }
5066                                         else {
5067                                                 // concatenate all other pipes
5068                                                 $label .= '|' . $parameterMatch;
5069                                         }
5070                                 }
5071                                 // remove the first pipe
5072                                 $label = substr( $label, 1 );
5073                         }
5074
5075                         $ig->add( $title, $label, $alt, $link );
5076                 }
5077                 return $ig->toHTML();
5078         }
5079
5080         /**
5081          * @param $handler
5082          * @return array
5083          */
5084         function getImageParams( $handler ) {
5085                 if ( $handler ) {
5086                         $handlerClass = get_class( $handler );
5087                 } else {
5088                         $handlerClass = '';
5089                 }
5090                 if ( !isset( $this->mImageParams[$handlerClass] ) ) {
5091                         # Initialise static lists
5092                         static $internalParamNames = array(
5093                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
5094                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
5095                                         'bottom', 'text-bottom' ),
5096                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
5097                                         'upright', 'border', 'link', 'alt', 'class' ),
5098                         );
5099                         static $internalParamMap;
5100                         if ( !$internalParamMap ) {
5101                                 $internalParamMap = array();
5102                                 foreach ( $internalParamNames as $type => $names ) {
5103                                         foreach ( $names as $name ) {
5104                                                 $magicName = str_replace( '-', '_', "img_$name" );
5105                                                 $internalParamMap[$magicName] = array( $type, $name );
5106                                         }
5107                                 }
5108                         }
5109
5110                         # Add handler params
5111                         $paramMap = $internalParamMap;
5112                         if ( $handler ) {
5113                                 $handlerParamMap = $handler->getParamMap();
5114                                 foreach ( $handlerParamMap as $magic => $paramName ) {
5115                                         $paramMap[$magic] = array( 'handler', $paramName );
5116                                 }
5117                         }
5118                         $this->mImageParams[$handlerClass] = $paramMap;
5119                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
5120                 }
5121                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
5122         }
5123
5124         /**
5125          * Parse image options text and use it to make an image
5126          *
5127          * @param $title Title
5128          * @param $options String
5129          * @param $holders LinkHolderArray|bool
5130          * @return string HTML
5131          */
5132         function makeImage( $title, $options, $holders = false ) {
5133                 # Check if the options text is of the form "options|alt text"
5134                 # Options are:
5135                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
5136                 #  * left       no resizing, just left align. label is used for alt= only
5137                 #  * right      same, but right aligned
5138                 #  * none       same, but not aligned
5139                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
5140                 #  * center     center the image
5141                 #  * frame      Keep original image size, no magnify-button.
5142                 #  * framed     Same as "frame"
5143                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
5144                 #  * upright    reduce width for upright images, rounded to full __0 px
5145                 #  * border     draw a 1px border around the image
5146                 #  * alt        Text for HTML alt attribute (defaults to empty)
5147                 #  * class      Set a class for img node
5148                 #  * link       Set the target of the image link. Can be external, interwiki, or local
5149                 # vertical-align values (no % or length right now):
5150                 #  * baseline
5151                 #  * sub
5152                 #  * super
5153                 #  * top
5154                 #  * text-top
5155                 #  * middle
5156                 #  * bottom
5157                 #  * text-bottom
5158
5159                 $parts = StringUtils::explode( "|", $options );
5160
5161                 # Give extensions a chance to select the file revision for us
5162                 $options = array();
5163                 $descQuery = false;
5164                 wfRunHooks( 'BeforeParserFetchFileAndTitle',
5165                         array( $this, $title, &$options, &$descQuery ) );
5166                 # Fetch and register the file (file title may be different via hooks)
5167                 list( $file, $title ) = $this->fetchFileAndTitle( $title, $options );
5168
5169                 # Get parameter map
5170                 $handler = $file ? $file->getHandler() : false;
5171
5172                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
5173
5174                 if ( !$file ) {
5175                         $this->addTrackingCategory( 'broken-file-category' );
5176                 }
5177
5178                 # Process the input parameters
5179                 $caption = '';
5180                 $params = array( 'frame' => array(), 'handler' => array(),
5181                         'horizAlign' => array(), 'vertAlign' => array() );
5182                 foreach ( $parts as $part ) {
5183                         $part = trim( $part );
5184                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
5185                         $validated = false;
5186                         if ( isset( $paramMap[$magicName] ) ) {
5187                                 list( $type, $paramName ) = $paramMap[$magicName];
5188
5189                                 # Special case; width and height come in one variable together
5190                                 if ( $type === 'handler' && $paramName === 'width' ) {
5191                                         $parsedWidthParam = $this->parseWidthParam( $value );
5192                                         if( isset( $parsedWidthParam['width'] ) ) {
5193                                                 $width = $parsedWidthParam['width'];
5194                                                 if ( $handler->validateParam( 'width', $width ) ) {
5195                                                         $params[$type]['width'] = $width;
5196                                                         $validated = true;
5197                                                 }
5198                                         }
5199                                         if( isset( $parsedWidthParam['height'] ) ) {
5200                                                 $height = $parsedWidthParam['height'];
5201                                                 if ( $handler->validateParam( 'height', $height ) ) {
5202                                                         $params[$type]['height'] = $height;
5203                                                         $validated = true;
5204                                                 }
5205                                         }
5206                                         # else no validation -- bug 13436
5207                                 } else {
5208                                         if ( $type === 'handler' ) {
5209                                                 # Validate handler parameter
5210                                                 $validated = $handler->validateParam( $paramName, $value );
5211                                         } else {
5212                                                 # Validate internal parameters
5213                                                 switch( $paramName ) {
5214                                                 case 'manualthumb':
5215                                                 case 'alt':
5216                                                 case 'class':
5217                                                         # @todo FIXME: Possibly check validity here for
5218                                                         # manualthumb? downstream behavior seems odd with
5219                                                         # missing manual thumbs.
5220                                                         $validated = true;
5221                                                         $value = $this->stripAltText( $value, $holders );
5222                                                         break;
5223                                                 case 'link':
5224                                                         $chars = self::EXT_LINK_URL_CLASS;
5225                                                         $prots = $this->mUrlProtocols;
5226                                                         if ( $value === '' ) {
5227                                                                 $paramName = 'no-link';
5228                                                                 $value = true;
5229                                                                 $validated = true;
5230                                                         } elseif ( preg_match( "/^(?i)$prots/", $value ) ) {
5231                                                                 if ( preg_match( "/^((?i)$prots)$chars+$/u", $value, $m ) ) {
5232                                                                         $paramName = 'link-url';
5233                                                                         $this->mOutput->addExternalLink( $value );
5234                                                                         if ( $this->mOptions->getExternalLinkTarget() ) {
5235                                                                                 $params[$type]['link-target'] = $this->mOptions->getExternalLinkTarget();
5236                                                                         }
5237                                                                         $validated = true;
5238                                                                 }
5239                                                         } else {
5240                                                                 $linkTitle = Title::newFromText( $value );
5241                                                                 if ( $linkTitle ) {
5242                                                                         $paramName = 'link-title';
5243                                                                         $value = $linkTitle;
5244                                                                         $this->mOutput->addLink( $linkTitle );
5245                                                                         $validated = true;
5246                                                                 }
5247                                                         }
5248                                                         break;
5249                                                 default:
5250                                                         # Most other things appear to be empty or numeric...
5251                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
5252                                                 }
5253                                         }
5254
5255                                         if ( $validated ) {
5256                                                 $params[$type][$paramName] = $value;
5257                                         }
5258                                 }
5259                         }
5260                         if ( !$validated ) {
5261                                 $caption = $part;
5262                         }
5263                 }
5264
5265                 # Process alignment parameters
5266                 if ( $params['horizAlign'] ) {
5267                         $params['frame']['align'] = key( $params['horizAlign'] );
5268                 }
5269                 if ( $params['vertAlign'] ) {
5270                         $params['frame']['valign'] = key( $params['vertAlign'] );
5271                 }
5272
5273                 $params['frame']['caption'] = $caption;
5274
5275                 # Will the image be presented in a frame, with the caption below?
5276                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
5277                                                  isset( $params['frame']['framed'] ) ||
5278                                                  isset( $params['frame']['thumbnail'] ) ||
5279                                                  isset( $params['frame']['manualthumb'] );
5280
5281                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
5282                 # came to also set the caption, ordinary text after the image -- which
5283                 # makes no sense, because that just repeats the text multiple times in
5284                 # screen readers.  It *also* came to set the title attribute.
5285                 #
5286                 # Now that we have an alt attribute, we should not set the alt text to
5287                 # equal the caption: that's worse than useless, it just repeats the
5288                 # text.  This is the framed/thumbnail case.  If there's no caption, we
5289                 # use the unnamed parameter for alt text as well, just for the time be-
5290                 # ing, if the unnamed param is set and the alt param is not.
5291                 #
5292                 # For the future, we need to figure out if we want to tweak this more,
5293                 # e.g., introducing a title= parameter for the title; ignoring the un-
5294                 # named parameter entirely for images without a caption; adding an ex-
5295                 # plicit caption= parameter and preserving the old magic unnamed para-
5296                 # meter for BC; ...
5297                 if ( $imageIsFramed ) { # Framed image
5298                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
5299                                 # No caption or alt text, add the filename as the alt text so
5300                                 # that screen readers at least get some description of the image
5301                                 $params['frame']['alt'] = $title->getText();
5302                         }
5303                         # Do not set $params['frame']['title'] because tooltips don't make sense
5304                         # for framed images
5305                 } else { # Inline image
5306                         if ( !isset( $params['frame']['alt'] ) ) {
5307                                 # No alt text, use the "caption" for the alt text
5308                                 if ( $caption !== '' ) {
5309                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
5310                                 } else {
5311                                         # No caption, fall back to using the filename for the
5312                                         # alt text
5313                                         $params['frame']['alt'] = $title->getText();
5314                                 }
5315                         }
5316                         # Use the "caption" for the tooltip text
5317                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
5318                 }
5319
5320                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params, $this ) );
5321
5322                 # Linker does the rest
5323                 $time = isset( $options['time'] ) ? $options['time'] : false;
5324                 $ret = Linker::makeImageLink( $this, $title, $file, $params['frame'], $params['handler'],
5325                         $time, $descQuery, $this->mOptions->getThumbSize() );
5326
5327                 # Give the handler a chance to modify the parser object
5328                 if ( $handler ) {
5329                         $handler->parserTransformHook( $this, $file );
5330                 }
5331
5332                 return $ret;
5333         }
5334
5335         /**
5336          * @param $caption
5337          * @param $holders LinkHolderArray
5338          * @return mixed|String
5339          */
5340         protected function stripAltText( $caption, $holders ) {
5341                 # Strip bad stuff out of the title (tooltip).  We can't just use
5342                 # replaceLinkHoldersText() here, because if this function is called
5343                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
5344                 if ( $holders ) {
5345                         $tooltip = $holders->replaceText( $caption );
5346                 } else {
5347                         $tooltip = $this->replaceLinkHoldersText( $caption );
5348                 }
5349
5350                 # make sure there are no placeholders in thumbnail attributes
5351                 # that are later expanded to html- so expand them now and
5352                 # remove the tags
5353                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
5354                 $tooltip = Sanitizer::stripAllTags( $tooltip );
5355
5356                 return $tooltip;
5357         }
5358
5359         /**
5360          * Set a flag in the output object indicating that the content is dynamic and
5361          * shouldn't be cached.
5362          */
5363         function disableCache() {
5364                 wfDebug( "Parser output marked as uncacheable.\n" );
5365                 if ( !$this->mOutput ) {
5366                         throw new MWException( __METHOD__ .
5367                                 " can only be called when actually parsing something" );
5368                 }
5369                 $this->mOutput->setCacheTime( -1 ); // old style, for compatibility
5370                 $this->mOutput->updateCacheExpiry( 0 ); // new style, for consistency
5371         }
5372
5373         /**
5374          * Callback from the Sanitizer for expanding items found in HTML attribute
5375          * values, so they can be safely tested and escaped.
5376          *
5377          * @param $text String
5378          * @param $frame PPFrame
5379          * @return String
5380          */
5381         function attributeStripCallback( &$text, $frame = false ) {
5382                 $text = $this->replaceVariables( $text, $frame );
5383                 $text = $this->mStripState->unstripBoth( $text );
5384                 return $text;
5385         }
5386
5387         /**
5388          * Accessor
5389          *
5390          * @return array
5391          */
5392         function getTags() {
5393                 return array_merge( array_keys( $this->mTransparentTagHooks ), array_keys( $this->mTagHooks ), array_keys( $this->mFunctionTagHooks ) );
5394         }
5395
5396         /**
5397          * Replace transparent tags in $text with the values given by the callbacks.
5398          *
5399          * Transparent tag hooks are like regular XML-style tag hooks, except they
5400          * operate late in the transformation sequence, on HTML instead of wikitext.
5401          *
5402          * @param $text string
5403          *
5404          * @return string
5405          */
5406         function replaceTransparentTags( $text ) {
5407                 $matches = array();
5408                 $elements = array_keys( $this->mTransparentTagHooks );
5409                 $text = self::extractTagsAndParams( $elements, $text, $matches, $this->mUniqPrefix );
5410                 $replacements = array();
5411
5412                 foreach ( $matches as $marker => $data ) {
5413                         list( $element, $content, $params, $tag ) = $data;
5414                         $tagName = strtolower( $element );
5415                         if ( isset( $this->mTransparentTagHooks[$tagName] ) ) {
5416                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName], array( $content, $params, $this ) );
5417                         } else {
5418                                 $output = $tag;
5419                         }
5420                         $replacements[$marker] = $output;
5421                 }
5422                 return strtr( $text, $replacements );
5423         }
5424
5425         /**
5426          * Break wikitext input into sections, and either pull or replace
5427          * some particular section's text.
5428          *
5429          * External callers should use the getSection and replaceSection methods.
5430          *
5431          * @param string $text Page wikitext
5432          * @param string $section a section identifier string of the form:
5433          *   "<flag1> - <flag2> - ... - <section number>"
5434          *
5435          * Currently the only recognised flag is "T", which means the target section number
5436          * was derived during a template inclusion parse, in other words this is a template
5437          * section edit link. If no flags are given, it was an ordinary section edit link.
5438          * This flag is required to avoid a section numbering mismatch when a section is
5439          * enclosed by "<includeonly>" (bug 6563).
5440          *
5441          * The section number 0 pulls the text before the first heading; other numbers will
5442          * pull the given section along with its lower-level subsections. If the section is
5443          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
5444          *
5445          * Section 0 is always considered to exist, even if it only contains the empty
5446          * string. If $text is the empty string and section 0 is replaced, $newText is
5447          * returned.
5448          *
5449          * @param string $mode one of "get" or "replace"
5450          * @param string $newText replacement text for section data.
5451          * @return String: for "get", the extracted section text.
5452          *                 for "replace", the whole page with the section replaced.
5453          */
5454         private function extractSections( $text, $section, $mode, $newText = '' ) {
5455                 global $wgTitle; # not generally used but removes an ugly failure mode
5456                 $this->startParse( $wgTitle, new ParserOptions, self::OT_PLAIN, true );
5457                 $outText = '';
5458                 $frame = $this->getPreprocessor()->newFrame();
5459
5460                 # Process section extraction flags
5461                 $flags = 0;
5462                 $sectionParts = explode( '-', $section );
5463                 $sectionIndex = array_pop( $sectionParts );
5464                 foreach ( $sectionParts as $part ) {
5465                         if ( $part === 'T' ) {
5466                                 $flags |= self::PTD_FOR_INCLUSION;
5467                         }
5468                 }
5469
5470                 # Check for empty input
5471                 if ( strval( $text ) === '' ) {
5472                         # Only sections 0 and T-0 exist in an empty document
5473                         if ( $sectionIndex == 0 ) {
5474                                 if ( $mode === 'get' ) {
5475                                         return '';
5476                                 } else {
5477                                         return $newText;
5478                                 }
5479                         } else {
5480                                 if ( $mode === 'get' ) {
5481                                         return $newText;
5482                                 } else {
5483                                         return $text;
5484                                 }
5485                         }
5486                 }
5487
5488                 # Preprocess the text
5489                 $root = $this->preprocessToDom( $text, $flags );
5490
5491                 # <h> nodes indicate section breaks
5492                 # They can only occur at the top level, so we can find them by iterating the root's children
5493                 $node = $root->getFirstChild();
5494
5495                 # Find the target section
5496                 if ( $sectionIndex == 0 ) {
5497                         # Section zero doesn't nest, level=big
5498                         $targetLevel = 1000;
5499                 } else {
5500                         while ( $node ) {
5501                                 if ( $node->getName() === 'h' ) {
5502                                         $bits = $node->splitHeading();
5503                                         if ( $bits['i'] == $sectionIndex ) {
5504                                                 $targetLevel = $bits['level'];
5505                                                 break;
5506                                         }
5507                                 }
5508                                 if ( $mode === 'replace' ) {
5509                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5510                                 }
5511                                 $node = $node->getNextSibling();
5512                         }
5513                 }
5514
5515                 if ( !$node ) {
5516                         # Not found
5517                         if ( $mode === 'get' ) {
5518                                 return $newText;
5519                         } else {
5520                                 return $text;
5521                         }
5522                 }
5523
5524                 # Find the end of the section, including nested sections
5525                 do {
5526                         if ( $node->getName() === 'h' ) {
5527                                 $bits = $node->splitHeading();
5528                                 $curLevel = $bits['level'];
5529                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
5530                                         break;
5531                                 }
5532                         }
5533                         if ( $mode === 'get' ) {
5534                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5535                         }
5536                         $node = $node->getNextSibling();
5537                 } while ( $node );
5538
5539                 # Write out the remainder (in replace mode only)
5540                 if ( $mode === 'replace' ) {
5541                         # Output the replacement text
5542                         # Add two newlines on -- trailing whitespace in $newText is conventionally
5543                         # stripped by the editor, so we need both newlines to restore the paragraph gap
5544                         # Only add trailing whitespace if there is newText
5545                         if ( $newText != "" ) {
5546                                 $outText .= $newText . "\n\n";
5547                         }
5548
5549                         while ( $node ) {
5550                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5551                                 $node = $node->getNextSibling();
5552                         }
5553                 }
5554
5555                 if ( is_string( $outText ) ) {
5556                         # Re-insert stripped tags
5557                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
5558                 }
5559
5560                 return $outText;
5561         }
5562
5563         /**
5564          * This function returns the text of a section, specified by a number ($section).
5565          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5566          * the first section before any such heading (section 0).
5567          *
5568          * If a section contains subsections, these are also returned.
5569          *
5570          * @param string $text text to look in
5571          * @param string $section section identifier
5572          * @param string $deftext default to return if section is not found
5573          * @return string text of the requested section
5574          */
5575         public function getSection( $text, $section, $deftext = '' ) {
5576                 return $this->extractSections( $text, $section, "get", $deftext );
5577         }
5578
5579         /**
5580          * This function returns $oldtext after the content of the section
5581          * specified by $section has been replaced with $text. If the target
5582          * section does not exist, $oldtext is returned unchanged.
5583          *
5584          * @param string $oldtext former text of the article
5585          * @param int $section section identifier
5586          * @param string $text replacing text
5587          * @return String: modified text
5588          */
5589         public function replaceSection( $oldtext, $section, $text ) {
5590                 return $this->extractSections( $oldtext, $section, "replace", $text );
5591         }
5592
5593         /**
5594          * Get the ID of the revision we are parsing
5595          *
5596          * @return Mixed: integer or null
5597          */
5598         function getRevisionId() {
5599                 return $this->mRevisionId;
5600         }
5601
5602         /**
5603          * Get the revision object for $this->mRevisionId
5604          *
5605          * @return Revision|null either a Revision object or null
5606          */
5607         protected function getRevisionObject() {
5608                 if ( !is_null( $this->mRevisionObject ) ) {
5609                         return $this->mRevisionObject;
5610                 }
5611                 if ( is_null( $this->mRevisionId ) ) {
5612                         return null;
5613                 }
5614
5615                 $this->mRevisionObject = Revision::newFromId( $this->mRevisionId );
5616                 return $this->mRevisionObject;
5617         }
5618
5619         /**
5620          * Get the timestamp associated with the current revision, adjusted for
5621          * the default server-local timestamp
5622          */
5623         function getRevisionTimestamp() {
5624                 if ( is_null( $this->mRevisionTimestamp ) ) {
5625                         wfProfileIn( __METHOD__ );
5626
5627                         global $wgContLang;
5628
5629                         $revObject = $this->getRevisionObject();
5630                         $timestamp = $revObject ? $revObject->getTimestamp() : wfTimestampNow();
5631
5632                         # The cryptic '' timezone parameter tells to use the site-default
5633                         # timezone offset instead of the user settings.
5634                         #
5635                         # Since this value will be saved into the parser cache, served
5636                         # to other users, and potentially even used inside links and such,
5637                         # it needs to be consistent for all visitors.
5638                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5639
5640                         wfProfileOut( __METHOD__ );
5641                 }
5642                 return $this->mRevisionTimestamp;
5643         }
5644
5645         /**
5646          * Get the name of the user that edited the last revision
5647          *
5648          * @return String: user name
5649          */
5650         function getRevisionUser() {
5651                 if( is_null( $this->mRevisionUser ) ) {
5652                         $revObject = $this->getRevisionObject();
5653
5654                         # if this template is subst: the revision id will be blank,
5655                         # so just use the current user's name
5656                         if( $revObject ) {
5657                                 $this->mRevisionUser = $revObject->getUserText();
5658                         } elseif( $this->ot['wiki'] || $this->mOptions->getIsPreview() ) {
5659                                 $this->mRevisionUser = $this->getUser()->getName();
5660                         }
5661                 }
5662                 return $this->mRevisionUser;
5663         }
5664
5665         /**
5666          * Mutator for $mDefaultSort
5667          *
5668          * @param string $sort New value
5669          */
5670         public function setDefaultSort( $sort ) {
5671                 $this->mDefaultSort = $sort;
5672                 $this->mOutput->setProperty( 'defaultsort', $sort );
5673         }
5674
5675         /**
5676          * Accessor for $mDefaultSort
5677          * Will use the empty string if none is set.
5678          *
5679          * This value is treated as a prefix, so the
5680          * empty string is equivalent to sorting by
5681          * page name.
5682          *
5683          * @return string
5684          */
5685         public function getDefaultSort() {
5686                 if ( $this->mDefaultSort !== false ) {
5687                         return $this->mDefaultSort;
5688                 } else {
5689                         return '';
5690                 }
5691         }
5692
5693         /**
5694          * Accessor for $mDefaultSort
5695          * Unlike getDefaultSort(), will return false if none is set
5696          *
5697          * @return string or false
5698          */
5699         public function getCustomDefaultSort() {
5700                 return $this->mDefaultSort;
5701         }
5702
5703         /**
5704          * Try to guess the section anchor name based on a wikitext fragment
5705          * presumably extracted from a heading, for example "Header" from
5706          * "== Header ==".
5707          *
5708          * @param $text string
5709          *
5710          * @return string
5711          */
5712         public function guessSectionNameFromWikiText( $text ) {
5713                 # Strip out wikitext links(they break the anchor)
5714                 $text = $this->stripSectionName( $text );
5715                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5716                 return '#' . Sanitizer::escapeId( $text, 'noninitial' );
5717         }
5718
5719         /**
5720          * Same as guessSectionNameFromWikiText(), but produces legacy anchors
5721          * instead.  For use in redirects, since IE6 interprets Redirect: headers
5722          * as something other than UTF-8 (apparently?), resulting in breakage.
5723          *
5724          * @param string $text The section name
5725          * @return string An anchor
5726          */
5727         public function guessLegacySectionNameFromWikiText( $text ) {
5728                 # Strip out wikitext links(they break the anchor)
5729                 $text = $this->stripSectionName( $text );
5730                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5731                 return '#' . Sanitizer::escapeId( $text, array( 'noninitial', 'legacy' ) );
5732         }
5733
5734         /**
5735          * Strips a text string of wikitext for use in a section anchor
5736          *
5737          * Accepts a text string and then removes all wikitext from the
5738          * string and leaves only the resultant text (i.e. the result of
5739          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5740          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5741          * to create valid section anchors by mimicing the output of the
5742          * parser when headings are parsed.
5743          *
5744          * @param string $text text string to be stripped of wikitext
5745          * for use in a Section anchor
5746          * @return string Filtered text string
5747          */
5748         public function stripSectionName( $text ) {
5749                 # Strip internal link markup
5750                 $text = preg_replace( '/\[\[:?([^[|]+)\|([^[]+)\]\]/', '$2', $text );
5751                 $text = preg_replace( '/\[\[:?([^[]+)\|?\]\]/', '$1', $text );
5752
5753                 # Strip external link markup
5754                 # @todo FIXME: Not tolerant to blank link text
5755                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5756                 # on how many empty links there are on the page - need to figure that out.
5757                 $text = preg_replace( '/\[(?i:' . $this->mUrlProtocols . ')([^ ]+?) ([^[]+)\]/', '$2', $text );
5758
5759                 # Parse wikitext quotes (italics & bold)
5760                 $text = $this->doQuotes( $text );
5761
5762                 # Strip HTML tags
5763                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5764                 return $text;
5765         }
5766
5767         /**
5768          * strip/replaceVariables/unstrip for preprocessor regression testing
5769          *
5770          * @param $text string
5771          * @param $title Title
5772          * @param $options ParserOptions
5773          * @param $outputType int
5774          *
5775          * @return string
5776          */
5777         function testSrvus( $text, Title $title, ParserOptions $options, $outputType = self::OT_HTML ) {
5778                 $this->startParse( $title, $options, $outputType, true );
5779
5780                 $text = $this->replaceVariables( $text );
5781                 $text = $this->mStripState->unstripBoth( $text );
5782                 $text = Sanitizer::removeHTMLtags( $text );
5783                 return $text;
5784         }
5785
5786         /**
5787          * @param $text string
5788          * @param $title Title
5789          * @param $options ParserOptions
5790          * @return string
5791          */
5792         function testPst( $text, Title $title, ParserOptions $options ) {
5793                 return $this->preSaveTransform( $text, $title, $options->getUser(), $options );
5794         }
5795
5796         /**
5797          * @param $text
5798          * @param $title Title
5799          * @param $options ParserOptions
5800          * @return string
5801          */
5802         function testPreprocess( $text, Title $title, ParserOptions $options ) {
5803                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5804         }
5805
5806         /**
5807          * Call a callback function on all regions of the given text that are not
5808          * inside strip markers, and replace those regions with the return value
5809          * of the callback. For example, with input:
5810          *
5811          *  aaa<MARKER>bbb
5812          *
5813          * This will call the callback function twice, with 'aaa' and 'bbb'. Those
5814          * two strings will be replaced with the value returned by the callback in
5815          * each case.
5816          *
5817          * @param $s string
5818          * @param $callback
5819          *
5820          * @return string
5821          */
5822         function markerSkipCallback( $s, $callback ) {
5823                 $i = 0;
5824                 $out = '';
5825                 while ( $i < strlen( $s ) ) {
5826                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5827                         if ( $markerStart === false ) {
5828                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5829                                 break;
5830                         } else {
5831                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5832                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5833                                 if ( $markerEnd === false ) {
5834                                         $out .= substr( $s, $markerStart );
5835                                         break;
5836                                 } else {
5837                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5838                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5839                                         $i = $markerEnd;
5840                                 }
5841                         }
5842                 }
5843                 return $out;
5844         }
5845
5846         /**
5847          * Remove any strip markers found in the given text.
5848          *
5849          * @param $text Input string
5850          * @return string
5851          */
5852         function killMarkers( $text ) {
5853                 return $this->mStripState->killMarkers( $text );
5854         }
5855
5856         /**
5857          * Save the parser state required to convert the given half-parsed text to
5858          * HTML. "Half-parsed" in this context means the output of
5859          * recursiveTagParse() or internalParse(). This output has strip markers
5860          * from replaceVariables (extensionSubstitution() etc.), and link
5861          * placeholders from replaceLinkHolders().
5862          *
5863          * Returns an array which can be serialized and stored persistently. This
5864          * array can later be loaded into another parser instance with
5865          * unserializeHalfParsedText(). The text can then be safely incorporated into
5866          * the return value of a parser hook.
5867          *
5868          * @param $text string
5869          *
5870          * @return array
5871          */
5872         function serializeHalfParsedText( $text ) {
5873                 wfProfileIn( __METHOD__ );
5874                 $data = array(
5875                         'text' => $text,
5876                         'version' => self::HALF_PARSED_VERSION,
5877                         'stripState' => $this->mStripState->getSubState( $text ),
5878                         'linkHolders' => $this->mLinkHolders->getSubArray( $text )
5879                 );
5880                 wfProfileOut( __METHOD__ );
5881                 return $data;
5882         }
5883
5884         /**
5885          * Load the parser state given in the $data array, which is assumed to
5886          * have been generated by serializeHalfParsedText(). The text contents is
5887          * extracted from the array, and its markers are transformed into markers
5888          * appropriate for the current Parser instance. This transformed text is
5889          * returned, and can be safely included in the return value of a parser
5890          * hook.
5891          *
5892          * If the $data array has been stored persistently, the caller should first
5893          * check whether it is still valid, by calling isValidHalfParsedText().
5894          *
5895          * @param array $data Serialized data
5896          * @throws MWException
5897          * @return String
5898          */
5899         function unserializeHalfParsedText( $data ) {
5900                 if ( !isset( $data['version'] ) || $data['version'] != self::HALF_PARSED_VERSION ) {
5901                         throw new MWException( __METHOD__ . ': invalid version' );
5902                 }
5903
5904                 # First, extract the strip state.
5905                 $texts = array( $data['text'] );
5906                 $texts = $this->mStripState->merge( $data['stripState'], $texts );
5907
5908                 # Now renumber links
5909                 $texts = $this->mLinkHolders->mergeForeign( $data['linkHolders'], $texts );
5910
5911                 # Should be good to go.
5912                 return $texts[0];
5913         }
5914
5915         /**
5916          * Returns true if the given array, presumed to be generated by
5917          * serializeHalfParsedText(), is compatible with the current version of the
5918          * parser.
5919          *
5920          * @param $data Array
5921          *
5922          * @return bool
5923          */
5924         function isValidHalfParsedText( $data ) {
5925                 return isset( $data['version'] ) && $data['version'] == self::HALF_PARSED_VERSION;
5926         }
5927
5928         /**
5929          * Parsed a width param of imagelink like 300px or 200x300px
5930          *
5931          * @param $value String
5932          *
5933          * @return array
5934          * @since 1.20
5935          */
5936         public function parseWidthParam( $value ) {
5937                 $parsedWidthParam = array();
5938                 if( $value === '' ) {
5939                         return $parsedWidthParam;
5940                 }
5941                 $m = array();
5942                 # (bug 13500) In both cases (width/height and width only),
5943                 # permit trailing "px" for backward compatibility.
5944                 if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
5945                         $width = intval( $m[1] );
5946                         $height = intval( $m[2] );
5947                         $parsedWidthParam['width'] = $width;
5948                         $parsedWidthParam['height'] = $height;
5949                 } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
5950                         $width = intval( $value );
5951                         $parsedWidthParam['width'] = $width;
5952                 }
5953                 return $parsedWidthParam;
5954         }
5955 }