includes/parser/Parser.php

   1 <?php
   2 /**
   3  * @defgroup Parser Parser
   4  *
   5  * @file
   6  * @ingroup Parser
   7  * File for Parser and related classes
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *     produces HTML output
  21  * preSaveTransform().
  22  *     produces altered wiki markup.
  23  * preprocess()
  24  *     removes HTML comments and expands templates
  25  * cleanSig() / cleanSigInSig()
  26  *     Cleans a signature before saving it to preferences
  27  * getSection()
  28  *     Return the content of a section from an article for section editing
  29  * replaceSection()
  30  *     Replaces a section by number inside an article
  31  * getPreloadText()
  32  *     Removes <noinclude> sections, and <includeonly> tags.
  33  *
  34  * Globals used:
  35  *    objects:   $wgLang, $wgContLang
  36  *
  37  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  38  *
  39  * settings:
  40  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  41  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  42  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  43  *  $wgMaxArticleSize*
  44  *
  45  *  * only within ParserOptions
  46  * </pre>
  47  *
  48  * @ingroup Parser
  49  */
  50 class Parser {
  51         /**
  52          * Update this version number when the ParserOutput format
  53          * changes in an incompatible way, so the parser cache
  54          * can automatically discard old data.
  55          */
  56         const VERSION = '1.6.4';
  57
  58         # Flags for Parser::setFunctionHook
  59         # Also available as global constants from Defines.php
  60         const SFH_NO_HASH = 1;
  61         const SFH_OBJECT_ARGS = 2;
  62
  63         # Constants needed for external link processing
  64         # Everything except bracket, space, or control characters
  65         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  66         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  67                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  68
  69         # State constants for the definition list colon extraction
  70         const COLON_STATE_TEXT = 0;
  71         const COLON_STATE_TAG = 1;
  72         const COLON_STATE_TAGSTART = 2;
  73         const COLON_STATE_CLOSETAG = 3;
  74         const COLON_STATE_TAGSLASH = 4;
  75         const COLON_STATE_COMMENT = 5;
  76         const COLON_STATE_COMMENTDASH = 6;
  77         const COLON_STATE_COMMENTDASHDASH = 7;
  78
  79         # Flags for preprocessToDom
  80         const PTD_FOR_INCLUSION = 1;
  81
  82         # Allowed values for $this->mOutputType
  83         # Parameter to startExternalParse().
  84         const OT_HTML = 1; # like parse()
  85         const OT_WIKI = 2; # like preSaveTransform()
  86         const OT_PREPROCESS = 3; # like preprocess()
  87         const OT_MSG = 3;
  88         const OT_PLAIN = 4; # like extractSections() - portions of the original are returned unchanged.
  89
  90         # Marker Suffix needs to be accessible staticly.
  91         const MARKER_SUFFIX = "-QINU\x7f";
  92
  93         # Persistent:
  94         var $mTagHooks = array();
  95         var $mTransparentTagHooks = array();
  96         var $mFunctionHooks = array();
  97         var $mFunctionSynonyms = array( 0 => array(), 1 => array() );
  98         var $mFunctionTagHooks = array();
  99         var $mStripList  = array();
 100         var $mDefaultStripList  = array();
 101         var $mVarCache = array();
 102         var $mImageParams = array();
 103         var $mImageParamsMagicArray = array();
 104         var $mMarkerIndex = 0;
 105         var $mFirstCall = true;
 106         var $mVariables, $mSubstWords; # Initialised by initialiseVariables()
 107         var $mConf, $mPreprocessor, $mExtLinkBracketedRegex, $mUrlProtocols; # Initialised in constructor
 108
 109
 110         # Cleared with clearState():
 111         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 112         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 113         var $mLinkHolders, $mLinkID;
 114         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 115         var $mTplExpandCache; # empty-frame expansion cache
 116         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 117         var $mExpensiveFunctionCount; # number of expensive parser function calls
 118         var $mUser; # User object; only used when doing pre-save transform
 119
 120         # Temporary
 121         # These are variables reset at least once per parse regardless of $clearState
 122         var $mOptions;      # ParserOptions object
 123         var $mTitle;        # Title context, used for self-link rendering and similar things
 124         var $mOutputType;   # Output type, one of the OT_xxx constants
 125         var $ot;            # Shortcut alias, see setOutputType()
 126         var $mRevisionObject; # The revision object of the specified revision ID
 127         var $mRevisionId;   # ID to display in {{REVISIONID}} tags
 128         var $mRevisionTimestamp; # The timestamp of the specified revision ID
 129         var $mRevisionUser; # Userto display in {{REVISIONUSER}} tag
 130         var $mRevIdForTs;   # The revision ID which was used to fetch the timestamp
 131
 132         /**
 133          * Constructor
 134          *
 135          * @public
 136          */
 137         function __construct( $conf = array() ) {
 138                 $this->mConf = $conf;
 139                 $this->mUrlProtocols = wfUrlProtocols();
 140                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 141                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x00-\\x08\\x0a-\\x1F]*?)\]/S';
 142                 if ( isset( $conf['preprocessorClass'] ) ) {
 143                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 144                 } elseif ( extension_loaded( 'domxml' ) ) {
 145                         # PECL extension that conflicts with the core DOM extension (bug 13770)
 146                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 147                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 148                 } elseif ( extension_loaded( 'dom' ) ) {
 149                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 150                 } else {
 151                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 152                 }
 153         }
 154
 155         /**
 156          * Reduce memory usage to reduce the impact of circular references
 157          */
 158         function __destruct() {
 159                 if ( isset( $this->mLinkHolders ) ) {
 160                         $this->mLinkHolders->__destruct();
 161                 }
 162                 foreach ( $this as $name => $value ) {
 163                         unset( $this->$name );
 164                 }
 165         }
 166
 167         /**
 168          * Do various kinds of initialisation on the first call of the parser
 169          */
 170         function firstCallInit() {
 171                 if ( !$this->mFirstCall ) {
 172                         return;
 173                 }
 174                 $this->mFirstCall = false;
 175
 176                 wfProfileIn( __METHOD__ );
 177
 178                 CoreParserFunctions::register( $this );
 179                 CoreTagHooks::register( $this );
 180                 $this->initialiseVariables();
 181
 182                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 183                 wfProfileOut( __METHOD__ );
 184         }
 185
 186         /**
 187          * Clear Parser state
 188          *
 189          * @private
 190          */
 191         function clearState() {
 192                 wfProfileIn( __METHOD__ );
 193                 if ( $this->mFirstCall ) {
 194                         $this->firstCallInit();
 195                 }
 196                 $this->mOutput = new ParserOutput;
 197                 $this->mOptions->registerWatcher( array( $this->mOutput, 'recordOption' ) );
 198                 $this->mAutonumber = 0;
 199                 $this->mLastSection = '';
 200                 $this->mDTopen = false;
 201                 $this->mIncludeCount = array();
 202                 $this->mStripState = new StripState;
 203                 $this->mArgStack = false;
 204                 $this->mInPre = false;
 205                 $this->mLinkHolders = new LinkHolderArray( $this );
 206                 $this->mLinkID = 0;
 207                 $this->mRevisionObject = $this->mRevisionTimestamp =
 208                         $this->mRevisionId = $this->mRevisionUser = null;
 209                 $this->mVarCache = array();
 210                 $this->mUser = null;
 211
 212                 /**
 213                  * Prefix for temporary replacement strings for the multipass parser.
 214                  * \x07 should never appear in input as it's disallowed in XML.
 215                  * Using it at the front also gives us a little extra robustness
 216                  * since it shouldn't match when butted up against identifier-like
 217                  * string constructs.
 218                  *
 219                  * Must not consist of all title characters, or else it will change
 220                  * the behaviour of <nowiki> in a link.
 221                  */
 222                 # $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 223                 # Changed to \x7f to allow XML double-parsing -- TS
 224                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 225
 226
 227                 # Clear these on every parse, bug 4549
 228                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 229
 230                 $this->mShowToc = true;
 231                 $this->mForceTocPosition = false;
 232                 $this->mIncludeSizes = array(
 233                         'post-expand' => 0,
 234                         'arg' => 0,
 235                 );
 236                 $this->mPPNodeCount = 0;
 237                 $this->mDefaultSort = false;
 238                 $this->mHeadings = array();
 239                 $this->mDoubleUnderscores = array();
 240                 $this->mExpensiveFunctionCount = 0;
 241
 242                 # Fix cloning
 243                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 244                         $this->mPreprocessor = null;
 245                 }
 246
 247                 wfRunHooks( 'ParserClearState', array( &$this ) );
 248                 wfProfileOut( __METHOD__ );
 249         }
 250
 251         /**
 252          * Convert wikitext to HTML
 253          * Do not call this function recursively.
 254          *
 255          * @param $text String: text we want to parse
 256          * @param $title A title object
 257          * @param $options ParserOptions
 258          * @param $linestart boolean
 259          * @param $clearState boolean
 260          * @param $revid Int: number to pass in {{REVISIONID}}
 261          * @return ParserOutput a ParserOutput
 262          */
 263         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 264                 /**
 265                  * First pass--just handle <nowiki> sections, pass the rest off
 266                  * to internalParse() which does all the real work.
 267                  */
 268
 269                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang, $wgDisableLangConversion, $wgDisableTitleConversion;
 270                 $fname = __METHOD__.'-' . wfGetCaller();
 271                 wfProfileIn( __METHOD__ );
 272                 wfProfileIn( $fname );
 273
 274                 $this->mOptions = $options;
 275                 if ( $clearState ) {
 276                         $this->clearState();
 277                 }
 278
 279                 $this->setTitle( $title ); # Page title has to be set for the pre-processor
 280
 281                 $oldRevisionId = $this->mRevisionId;
 282                 $oldRevisionObject = $this->mRevisionObject;
 283                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 284                 $oldRevisionUser = $this->mRevisionUser;
 285                 if ( $revid !== null ) {
 286                         $this->mRevisionId = $revid;
 287                         $this->mRevisionObject = null;
 288                         $this->mRevisionTimestamp = null;
 289                         $this->mRevisionUser = null;
 290                 }
 291                 $this->setOutputType( self::OT_HTML );
 292                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 293                 # No more strip!
 294                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 295                 $text = $this->internalParse( $text );
 296
 297                 $text = $this->mStripState->unstripGeneral( $text );
 298
 299                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 300                 $fixtags = array(
 301                         # french spaces, last one Guillemet-left
 302                         # only if there is something before the space
 303                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&#160;\\2',
 304                         # french spaces, Guillemet-right
 305                         '/(\\302\\253) /' => '\\1&#160;',
 306                         '/&#160;(!\s*important)/' => ' \\1', # Beware of CSS magic word !important, bug #11874.
 307                 );
 308                 $text = preg_replace( array_keys( $fixtags ), array_values( $fixtags ), $text );
 309
 310                 $text = $this->doBlockLevels( $text, $linestart );
 311
 312                 $this->replaceLinkHolders( $text );
 313
 314                 /**
 315                  * The page doesn't get language converted if
 316                  * a) It's disabled
 317                  * b) Content isn't converted
 318                  * c) It's a conversion table
 319                  */
 320                 if ( !( $wgDisableLangConversion
 321                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 322                                 || $this->mTitle->isConversionTable() ) ) {
 323
 324                         # The position of the convert() call should not be changed. it
 325                         # assumes that the links are all replaced and the only thing left
 326                         # is the <nowiki> mark.
 327
 328                         $text = $wgContLang->convert( $text );
 329                 }
 330
 331                 /**
 332                  * A converted title will be provided in the output object if title and
 333                  * content conversion are enabled, the article text does not contain
 334                  * a conversion-suppressing double-underscore tag, and no
 335                  * {{DISPLAYTITLE:...}} is present. DISPLAYTITLE takes precedence over
 336                  * automatic link conversion.
 337                  */
 338                 if ( !( $wgDisableLangConversion
 339                                 || $wgDisableTitleConversion
 340                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 341                                 || isset( $this->mDoubleUnderscores['notitleconvert'] )
 342                                 || $this->mOutput->getDisplayTitle() !== false ) )
 343                 {
 344                         $convruletitle = $wgContLang->getConvRuleTitle();
 345                         if ( $convruletitle ) {
 346                                 $this->mOutput->setTitleText( $convruletitle );
 347                         } else {
 348                                 $titleText = $wgContLang->convertTitle( $title );
 349                                 $this->mOutput->setTitleText( $titleText );
 350                         }
 351                 }
 352
 353                 $text = $this->mStripState->unstripNoWiki( $text );
 354
 355                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 356
 357 //!JF Move to its own function
 358
 359                 $uniq_prefix = $this->mUniqPrefix;
 360                 $matches = array();
 361                 $elements = array_keys( $this->mTransparentTagHooks );
 362                 $text = $this->extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 363
 364                 foreach ( $matches as $marker => $data ) {
 365                         list( $element, $content, $params, $tag ) = $data;
 366                         $tagName = strtolower( $element );
 367                         if ( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 368                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName], array( $content, $params, $this ) );
 369                         } else {
 370                                 $output = $tag;
 371                         }
 372                         $this->mStripState->general->setPair( $marker, $output );
 373                 }
 374                 $text = $this->mStripState->unstripGeneral( $text );
 375
 376                 $text = Sanitizer::normalizeCharReferences( $text );
 377
 378                 if ( ( $wgUseTidy && $this->mOptions->getTidy() ) || $wgAlwaysUseTidy ) {
 379                         $text = MWTidy::tidy( $text );
 380                 } else {
 381                         # attempt to sanitize at least some nesting problems
 382                         # (bug #2702 and quite a few others)
 383                         $tidyregs = array(
 384                                 # ''Something [http://www.cool.com cool''] -->
 385                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 386                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 387                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 388                                 # fix up an anchor inside another anchor, only
 389                                 # at least for a single single nested link (bug 3695)
 390                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 391                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 392                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 393                                 # contains a div, so fix it up here; replace
 394                                 # div with escaped text
 395                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 396                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 397                                 # remove empty italic or bold tag pairs, some
 398                                 # introduced by rules above
 399                                 '/<([bi])><\/\\1>/' => '',
 400                         );
 401
 402                         $text = preg_replace(
 403                                 array_keys( $tidyregs ),
 404                                 array_values( $tidyregs ),
 405                                 $text );
 406                 }
 407                 global $wgExpensiveParserFunctionLimit;
 408                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 409                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 410                 }
 411
 412                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 413
 414                 # Information on include size limits, for the benefit of users who try to skirt them
 415                 if ( $this->mOptions->getEnableLimitReport() ) {
 416                         $max = $this->mOptions->getMaxIncludeSize();
 417                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 418                         $limitReport =
 419                                 "NewPP limit report\n" .
 420                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->getMaxPPNodeCount()}\n" .
 421                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 422                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 423                                 $PFreport;
 424                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 425                         $text .= "\n<!-- \n$limitReport-->\n";
 426                 }
 427                 $this->mOutput->setText( $text );
 428
 429                 $this->mRevisionId = $oldRevisionId;
 430                 $this->mRevisionObject = $oldRevisionObject;
 431                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 432                 $this->mRevisionUser = $oldRevisionUser;
 433                 wfProfileOut( $fname );
 434                 wfProfileOut( __METHOD__ );
 435
 436                 return $this->mOutput;
 437         }
 438
 439         /**
 440          * Recursive parser entry point that can be called from an extension tag
 441          * hook.
 442          *
 443          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 444          *
 445          * @param $text String: text extension wants to have parsed
 446          * @param $frame PPFrame: The frame to use for expanding any template variables
 447          */
 448         function recursiveTagParse( $text, $frame=false ) {
 449                 wfProfileIn( __METHOD__ );
 450                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 451                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 452                 $text = $this->internalParse( $text, false, $frame );
 453                 wfProfileOut( __METHOD__ );
 454                 return $text;
 455         }
 456
 457         /**
 458          * Expand templates and variables in the text, producing valid, static wikitext.
 459          * Also removes comments.
 460          */
 461         function preprocess( $text, $title, $options, $revid = null ) {
 462                 wfProfileIn( __METHOD__ );
 463                 $this->mOptions = $options;
 464                 $this->clearState();
 465                 $this->setOutputType( self::OT_PREPROCESS );
 466                 $this->setTitle( $title );
 467                 if ( $revid !== null ) {
 468                         $this->mRevisionId = $revid;
 469                 }
 470                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 471                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 472                 $text = $this->replaceVariables( $text );
 473                 $text = $this->mStripState->unstripBoth( $text );
 474                 wfProfileOut( __METHOD__ );
 475                 return $text;
 476         }
 477
 478         /**
 479          * Process the wikitext for the ?preload= feature. (bug 5210)
 480          *
 481          * <noinclude>, <includeonly> etc. are parsed as for template transclusion,
 482          * comments, templates, arguments, tags hooks and parser functions are untouched.
 483          */
 484         public function getPreloadText( $text, $title, $options ) {
 485                 # Parser (re)initialisation
 486                 $this->mOptions = $options;
 487                 $this->clearState();
 488                 $this->setOutputType( self::OT_PLAIN );
 489                 $this->setTitle( $title );
 490
 491                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 492                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
 493                 return $this->getPreprocessor()->newFrame()->expand( $dom, $flags );
 494         }
 495
 496         /**
 497          * Get a random string
 498          *
 499          * @private
 500          * @static
 501          */
 502         static private function getRandomString() {
 503                 return dechex( mt_rand( 0, 0x7fffffff ) ) . dechex( mt_rand( 0, 0x7fffffff ) );
 504         }
 505
 506         /**
 507          * Set the current user.
 508          * Should only be used when doing pre-save transform.
 509          *
 510          * @param $user Mixed: User object or null (to reset)
 511          */
 512         function setUser( $user ) {
 513                 $this->mUser = $user;
 514         }
 515
 516         /**
 517          * Accessor for mUniqPrefix.
 518          *
 519          * @return String
 520          */
 521         public function uniqPrefix() {
 522                 if ( !isset( $this->mUniqPrefix ) ) {
 523                         # @todo Fixme: this is probably *horribly wrong*
 524                         # LanguageConverter seems to want $wgParser's uniqPrefix, however
 525                         # if this is called for a parser cache hit, the parser may not
 526                         # have ever been initialized in the first place.
 527                         # Not really sure what the heck is supposed to be going on here.
 528                         return '';
 529                         # throw new MWException( "Accessing uninitialized mUniqPrefix" );
 530                 }
 531                 return $this->mUniqPrefix;
 532         }
 533
 534         /**
 535          * Set the context title
 536          */
 537         function setTitle( $t ) {
 538                 if ( !$t || $t instanceof FakeTitle ) {
 539                         $t = Title::newFromText( 'NO TITLE' );
 540                 }
 541
 542                 if ( strval( $t->getFragment() ) !== '' ) {
 543                         # Strip the fragment to avoid various odd effects
 544                         $this->mTitle = clone $t;
 545                         $this->mTitle->setFragment( '' );
 546                 } else {
 547                         $this->mTitle = $t;
 548                 }
 549         }
 550
 551         /**
 552          * Accessor for the Title object
 553          *
 554          * @return Title object
 555          */
 556         function getTitle() {
 557                 return $this->mTitle;
 558         }
 559
 560         /**
 561          * Accessor/mutator for the Title object
 562          *
 563          * @param $x New Title object or null to just get the current one
 564          * @return Title object
 565          */
 566         function Title( $x = null ) {
 567                 return wfSetVar( $this->mTitle, $x );
 568         }
 569
 570         /**
 571          * Set the output type
 572          *
 573          * @param $ot Integer: new value
 574          */
 575         function setOutputType( $ot ) {
 576                 $this->mOutputType = $ot;
 577                 # Shortcut alias
 578                 $this->ot = array(
 579                         'html' => $ot == self::OT_HTML,
 580                         'wiki' => $ot == self::OT_WIKI,
 581                         'pre' => $ot == self::OT_PREPROCESS,
 582                         'plain' => $ot == self::OT_PLAIN,
 583                 );
 584         }
 585
 586         /**
 587          * Accessor/mutator for the output type
 588          *
 589          * @param $x New value or null to just get the current one
 590          * @return Integer
 591          */
 592         function OutputType( $x = null ) {
 593                 return wfSetVar( $this->mOutputType, $x );
 594         }
 595
 596         /**
 597          * Get the ParserOutput object
 598          *
 599          * @return ParserOutput object
 600          */
 601         function getOutput() {
 602                 return $this->mOutput;
 603         }
 604
 605         /**
 606          * Get the ParserOptions object
 607          *
 608          * @return ParserOptions object
 609          */
 610         function getOptions() {
 611                 return $this->mOptions;
 612         }
 613
 614         /**
 615          * Accessor/mutator for the ParserOptions object
 616          *
 617          * @param $x New value or null to just get the current one
 618          * @return Current ParserOptions object
 619          */
 620         function Options( $x = null ) {
 621                 return wfSetVar( $this->mOptions, $x );
 622         }
 623
 624         function nextLinkID() {
 625                 return $this->mLinkID++;
 626         }
 627
 628         function getFunctionLang() {
 629                 global $wgLang, $wgContLang;
 630
 631                 $target = $this->mOptions->getTargetLanguage();
 632                 if ( $target !== null ) {
 633                         return $target;
 634                 } else {
 635                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 636                 }
 637         }
 638
 639         /**
 640          * Get a User object either from $this->mUser, if set, or from the
 641          * ParserOptions object otherwise
 642          *
 643          * @return User object
 644          */
 645         function getUser() {
 646                 if ( !is_null( $this->mUser ) ) {
 647                         return $this->mUser;
 648                 }
 649                 return $this->mOptions->getUser();
 650         }
 651
 652         /**
 653          * Get a preprocessor object
 654          *
 655          * @return Preprocessor instance
 656          */
 657         function getPreprocessor() {
 658                 if ( !isset( $this->mPreprocessor ) ) {
 659                         $class = $this->mPreprocessorClass;
 660                         $this->mPreprocessor = new $class( $this );
 661                 }
 662                 return $this->mPreprocessor;
 663         }
 664
 665         /**
 666          * Replaces all occurrences of HTML-style comments and the given tags
 667          * in the text with a random marker and returns the next text. The output
 668          * parameter $matches will be an associative array filled with data in
 669          * the form:
 670          *   'UNIQ-xxxxx' => array(
 671          *     'element',
 672          *     'tag content',
 673          *     array( 'param' => 'x' ),
 674          *     '<element param="x">tag content</element>' ) )
 675          *
 676          * @param $elements list of element names. Comments are always extracted.
 677          * @param $text Source text string.
 678          * @param $matches Out parameter, Array: extracted tags
 679          * @param $uniq_prefix
 680          * @return String: stripped text
 681          *
 682          * @static
 683          */
 684         public function extractTagsAndParams( $elements, $text, &$matches, $uniq_prefix = '' ) {
 685                 static $n = 1;
 686                 $stripped = '';
 687                 $matches = array();
 688
 689                 $taglist = implode( '|', $elements );
 690                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 691
 692                 while ( $text != '' ) {
 693                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 694                         $stripped .= $p[0];
 695                         if ( count( $p ) < 5 ) {
 696                                 break;
 697                         }
 698                         if ( count( $p ) > 5 ) {
 699                                 # comment
 700                                 $element    = $p[4];
 701                                 $attributes = '';
 702                                 $close      = '';
 703                                 $inside     = $p[5];
 704                         } else {
 705                                 # tag
 706                                 $element    = $p[1];
 707                                 $attributes = $p[2];
 708                                 $close      = $p[3];
 709                                 $inside     = $p[4];
 710                         }
 711
 712                         $marker = "$uniq_prefix-$element-" . sprintf( '%08X', $n++ ) . self::MARKER_SUFFIX;
 713                         $stripped .= $marker;
 714
 715                         if ( $close === '/>' ) {
 716                                 # Empty element tag, <tag />
 717                                 $content = null;
 718                                 $text = $inside;
 719                                 $tail = null;
 720                         } else {
 721                                 if ( $element === '!--' ) {
 722                                         $end = '/(-->)/';
 723                                 } else {
 724                                         $end = "/(<\\/$element\\s*>)/i";
 725                                 }
 726                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 727                                 $content = $q[0];
 728                                 if ( count( $q ) < 3 ) {
 729                                         # No end tag -- let it run out to the end of the text.
 730                                         $tail = '';
 731                                         $text = '';
 732                                 } else {
 733                                         $tail = $q[1];
 734                                         $text = $q[2];
 735                                 }
 736                         }
 737
 738                         $matches[$marker] = array( $element,
 739                                 $content,
 740                                 Sanitizer::decodeTagAttributes( $attributes ),
 741                                 "<$element$attributes$close$content$tail" );
 742                 }
 743                 return $stripped;
 744         }
 745
 746         /**
 747          * Get a list of strippable XML-like elements
 748          */
 749         function getStripList() {
 750                 return $this->mStripList;
 751         }
 752
 753         /**
 754          * @deprecated use replaceVariables
 755          */
 756         function strip( $text, $state, $stripcomments = false , $dontstrip = array() ) {
 757                 return $text;
 758         }
 759
 760         /**
 761          * Restores pre, math, and other extensions removed by strip()
 762          *
 763          * always call unstripNoWiki() after this one
 764          * @private
 765          * @deprecated use $this->mStripState->unstrip()
 766          */
 767         function unstrip( $text, $state ) {
 768                 return $state->unstripGeneral( $text );
 769         }
 770
 771         /**
 772          * Always call this after unstrip() to preserve the order
 773          *
 774          * @private
 775          * @deprecated use $this->mStripState->unstrip()
 776          */
 777         function unstripNoWiki( $text, $state ) {
 778                 return $state->unstripNoWiki( $text );
 779         }
 780
 781         /**
 782          * @deprecated use $this->mStripState->unstripBoth()
 783          */
 784         function unstripForHTML( $text ) {
 785                 return $this->mStripState->unstripBoth( $text );
 786         }
 787
 788         /**
 789          * Add an item to the strip state
 790          * Returns the unique tag which must be inserted into the stripped text
 791          * The tag will be replaced with the original text in unstrip()
 792          *
 793          * @private
 794          */
 795         function insertStripItem( $text ) {
 796                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 797                 $this->mMarkerIndex++;
 798                 $this->mStripState->general->setPair( $rnd, $text );
 799                 return $rnd;
 800         }
 801
 802         /**
 803          * Interface with html tidy
 804          * @deprecated Use MWTidy::tidy()
 805          */
 806         public static function tidy( $text ) {
 807                 wfDeprecated( __METHOD__ );
 808                 return MWTidy::tidy( $text );
 809         }
 810
 811         /**
 812          * parse the wiki syntax used to render tables
 813          *
 814          * @private
 815          */
 816         function doTableStuff( $text ) {
 817                 wfProfileIn( __METHOD__ );
 818
 819                 $lines = StringUtils::explode( "\n", $text );
 820                 $out = '';
 821                 $td_history = array(); # Is currently a td tag open?
 822                 $last_tag_history = array(); # Save history of last lag activated (td, th or caption)
 823                 $tr_history = array(); # Is currently a tr tag open?
 824                 $tr_attributes = array(); # history of tr attributes
 825                 $has_opened_tr = array(); # Did this table open a <tr> element?
 826                 $indent_level = 0; # indent level of the table
 827
 828                 # Keep pulling lines off the front of the array until they're all gone.
 829                 # we want to be able to push lines back on to the front of the stream,
 830                 # but StringUtils::explode() returns funky optimised Iterators which don't
 831                 # support insertion.  So maintain a separate buffer and draw on that first if
 832                 # there's anything in it
 833                 $extraLines = array();
 834                 $lines->rewind();
 835                 do {
 836                         if( $extraLines ){
 837                                 $outLine = array_shift( $extraLines );
 838                         } elseif( $lines->valid() ) {
 839                                 $outLine = $lines->current();
 840                                 $lines->next();
 841                         } else {
 842                                 break;
 843                         }
 844                         $line = trim( $outLine );
 845
 846                         if ( $line === '' ) { # empty line, go to next line
 847                                 $out .= $outLine."\n";
 848                                 continue;
 849                         }
 850
 851                         $first_character = $line[0];
 852                         $matches = array();
 853
 854                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 855                                 # First check if we are starting a new table
 856                                 $indent_level = strlen( $matches[1] );
 857
 858                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 859                                 $attributes = Sanitizer::fixTagAttributes( $attributes , 'table' );
 860
 861                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 862                                 array_push( $td_history , false );
 863                                 array_push( $last_tag_history , '' );
 864                                 array_push( $tr_history , false );
 865                                 array_push( $tr_attributes , '' );
 866                                 array_push( $has_opened_tr , false );
 867                         } elseif ( count( $td_history ) == 0 ) {
 868                                 # Don't do any of the following
 869                                 $out .= $outLine."\n";
 870                                 continue;
 871                         } elseif ( substr( $line , 0 , 2 ) === '|}' ) {
 872                                 # We are ending a table
 873                                 $line = '</table>' . substr( $line , 2 );
 874                                 $last_tag = array_pop( $last_tag_history );
 875
 876                                 if ( !array_pop( $has_opened_tr ) ) {
 877                                         $line = "<tr><td></td></tr>{$line}";
 878                                 }
 879
 880                                 if ( array_pop( $tr_history ) ) {
 881                                         $line = "</tr>{$line}";
 882                                 }
 883
 884                                 if ( array_pop( $td_history ) ) {
 885                                         $line = "</{$last_tag}>{$line}";
 886                                 }
 887                                 array_pop( $tr_attributes );
 888                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 889                         } elseif ( substr( $line , 0 , 2 ) === '|-' ) {
 890                                 # Now we have a table row
 891                                 $line = preg_replace( '#^\|-+#', '', $line );
 892
 893                                 # Whats after the tag is now only attributes
 894                                 $attributes = $this->mStripState->unstripBoth( $line );
 895                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
 896                                 array_pop( $tr_attributes );
 897                                 array_push( $tr_attributes, $attributes );
 898
 899                                 $line = '';
 900                                 $last_tag = array_pop( $last_tag_history );
 901                                 array_pop( $has_opened_tr );
 902                                 array_push( $has_opened_tr , true );
 903
 904                                 if ( array_pop( $tr_history ) ) {
 905                                         $line = '</tr>';
 906                                 }
 907
 908                                 if ( array_pop( $td_history ) ) {
 909                                         $line = "</{$last_tag}>{$line}";
 910                                 }
 911
 912                                 $outLine = $line;
 913                                 array_push( $tr_history , false );
 914                                 array_push( $td_history , false );
 915                                 array_push( $last_tag_history , '' );
 916                         } elseif ( $first_character === '|' || $first_character === '!' || substr( $line , 0 , 2 )  === '|+' ) {
 917                                 # This might be cell elements, td, th or captions
 918                                 if ( substr( $line , 0 , 2 ) === '|+' ) {
 919                                         $first_character = '|+';
 920                                 }
 921
 922                                 $line = substr( $line , strlen( $first_character ) );
 923
 924                                 if ( $first_character === '!' ) {
 925                                         $line = str_replace( '!!' , '||' , $line );
 926                                 }
 927
 928                                 # Split up multiple cells on the same line.
 929                                 # FIXME : This can result in improper nesting of tags processed
 930                                 # by earlier parser steps, but should avoid splitting up eg
 931                                 # attribute values containing literal "||".
 932                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 933                                 $cell = array_shift( $cells );
 934
 935                                 # Inject cells back into the stream to be dealt with later
 936                                 # TODO: really we should do the whole thing as a stream...
 937                                 # but that would be too much like a sensible implementation :P
 938                                 if( count( $cells ) ){
 939                                         foreach( array_reverse( $cells ) as $extraCell ){
 940                                                 array_unshift( $extraLines, $first_character . $extraCell );
 941                                         }
 942                                 }
 943
 944                                 $outLine = '';
 945
 946                                 $previous = '';
 947                                 if ( $first_character !== '|+' ) {
 948                                         $tr_after = array_pop( $tr_attributes );
 949                                         if ( !array_pop( $tr_history ) ) {
 950                                                 $previous = "<tr{$tr_after}>\n";
 951                                         }
 952                                         array_push( $tr_history , true );
 953                                         array_push( $tr_attributes , '' );
 954                                         array_pop( $has_opened_tr );
 955                                         array_push( $has_opened_tr , true );
 956                                 }
 957
 958                                 $last_tag = array_pop( $last_tag_history );
 959
 960                                 if ( array_pop( $td_history ) ) {
 961                                         $previous = "</{$last_tag}>\n{$previous}";
 962                                 }
 963
 964                                 if ( $first_character === '|' ) {
 965                                         $last_tag = 'td';
 966                                 } elseif ( $first_character === '!' ) {
 967                                         $last_tag = 'th';
 968                                 } elseif ( $first_character === '|+' ) {
 969                                         $last_tag = 'caption';
 970                                 } else {
 971                                         $last_tag = '';
 972                                 }
 973
 974                                 array_push( $last_tag_history , $last_tag );
 975
 976                                 # A cell could contain both parameters and data... but the pipe could
 977                                 # also be the start of a nested table, or a raw pipe inside an invalid
 978                                 # link (bug 553).
 979                                 $cell_data = preg_split( '/(?<!\{)\|/', $cell, 2 );
 980
 981                                 # Bug 553: a '|' inside an invalid link should not
 982                                 # be mistaken as delimiting cell parameters
 983                                 if ( strpos( $cell_data[0], '[[' ) !== false ) {
 984                                         $data = $cell;
 985                                         $cell = "{$previous}<{$last_tag}>";
 986                                 } elseif ( count( $cell_data ) == 1 ) {
 987                                         $cell = "{$previous}<{$last_tag}>";
 988                                         $data = $cell_data[0];
 989                                 } else {
 990                                         $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 991                                         $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 992                                         $cell = "{$previous}<{$last_tag}{$attributes}>";
 993                                         $data = $cell_data[1];
 994                                 }
 995
 996                                 # Bug 529: the start of a table cell should be a linestart context for
 997                                 # processing other block markup, including nested tables.  The original
 998                                 # implementation of this was to add a newline before every brace construct,
 999                                 # which broke all manner of other things.  Instead, push the contents
1000                                 # of the cell back into the stream and come back to it later.  But don't
1001                                 # do that if the first line is empty, or you may get extra whitespace
1002                                 if( $data ){
1003                                         array_unshift( $extraLines, trim( $data ) );
1004                                 }
1005
1006                                 $outLine .= $cell;
1007                                 array_push( $td_history , true );
1008                         }
1009                         $out .= $outLine . "\n";
1010                 } while( $lines->valid() || count( $extraLines ) );
1011
1012                 # Closing open td, tr && table
1013                 while ( count( $td_history ) > 0 ) {
1014                         if ( array_pop( $td_history ) ) {
1015                                 $out .= "</td>\n";
1016                         }
1017                         if ( array_pop( $tr_history ) ) {
1018                                 $out .= "</tr>\n";
1019                         }
1020                         if ( !array_pop( $has_opened_tr ) ) {
1021                                 $out .= "<tr><td></td></tr>\n" ;
1022                         }
1023
1024                         $out .= "</table>\n";
1025                 }
1026
1027                 # Remove trailing line-ending (b/c)
1028                 if ( substr( $out, -1 ) === "\n" ) {
1029                         $out = substr( $out, 0, -1 );
1030                 }
1031
1032                 # special case: don't return empty table
1033                 if ( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
1034                         $out = '';
1035                 }
1036
1037                 wfProfileOut( __METHOD__ );
1038
1039                 return $out;
1040         }
1041
1042         /**
1043          * Helper function for parse() that transforms wiki markup into
1044          * HTML. Only called for $mOutputType == self::OT_HTML.
1045          *
1046          * @private
1047          */
1048         function internalParse( $text, $isMain = true, $frame=false ) {
1049                 wfProfileIn( __METHOD__ );
1050
1051                 $origText = $text;
1052
1053                 # Hook to suspend the parser in this state
1054                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
1055                         wfProfileOut( __METHOD__ );
1056                         return $text ;
1057                 }
1058
1059                 # if $frame is provided, then use $frame for replacing any variables
1060                 if ( $frame ) {
1061                         # use frame depth to infer how include/noinclude tags should be handled
1062                         # depth=0 means this is the top-level document; otherwise it's an included document
1063                         if ( !$frame->depth ) {
1064                                 $flag = 0;
1065                         } else {
1066                                 $flag = Parser::PTD_FOR_INCLUSION;
1067                         }
1068                         $dom = $this->preprocessToDom( $text, $flag );
1069                         $text = $frame->expand( $dom );
1070                 } else {
1071                         # if $frame is not provided, then use old-style replaceVariables
1072                         $text = $this->replaceVariables( $text );
1073                 }
1074
1075                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
1076                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
1077
1078                 # Tables need to come after variable replacement for things to work
1079                 # properly; putting them before other transformations should keep
1080                 # exciting things like link expansions from showing up in surprising
1081                 # places.
1082                 $text = $this->doTableStuff( $text );
1083
1084                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1085
1086                 $text = $this->doDoubleUnderscore( $text );
1087
1088                 $text = $this->doHeadings( $text );
1089                 if ( $this->mOptions->getUseDynamicDates() ) {
1090                         $df = DateFormatter::getInstance();
1091                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1092                 }
1093                 $text = $this->replaceInternalLinks( $text );
1094                 $text = $this->doAllQuotes( $text );
1095                 $text = $this->replaceExternalLinks( $text );
1096
1097                 # replaceInternalLinks may sometimes leave behind
1098                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1099                 $text = str_replace( $this->mUniqPrefix.'NOPARSE', '', $text );
1100
1101                 $text = $this->doMagicLinks( $text );
1102                 $text = $this->formatHeadings( $text, $origText, $isMain );
1103
1104                 wfProfileOut( __METHOD__ );
1105                 return $text;
1106         }
1107
1108         /**
1109          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1110          * magic external links.
1111          *
1112          * DML
1113          * @private
1114          */
1115         function doMagicLinks( $text ) {
1116                 wfProfileIn( __METHOD__ );
1117                 $prots = $this->mUrlProtocols;
1118                 $urlChar = self::EXT_LINK_URL_CLASS;
1119                 $text = preg_replace_callback(
1120                         '!(?:                           # Start cases
1121                                 (<a[ \t\r\n>].*?</a>) |     # m[1]: Skip link text
1122                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
1123                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
1124                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
1125                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
1126                                         (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1127                                         (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1128                                         [0-9Xx]                 # check digit
1129                                         \b)
1130                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1131                 wfProfileOut( __METHOD__ );
1132                 return $text;
1133         }
1134
1135         function magicLinkCallback( $m ) {
1136                 if ( isset( $m[1] ) && $m[1] !== '' ) {
1137                         # Skip anchor
1138                         return $m[0];
1139                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
1140                         # Skip HTML element
1141                         return $m[0];
1142                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
1143                         # Free external link
1144                         return $this->makeFreeExternalLink( $m[0] );
1145                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
1146                         # RFC or PMID
1147                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1148                                 $keyword = 'RFC';
1149                                 $urlmsg = 'rfcurl';
1150                                 $CssClass = 'mw-magiclink-rfc';
1151                                 $id = $m[4];
1152                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1153                                 $keyword = 'PMID';
1154                                 $urlmsg = 'pubmedurl';
1155                                 $CssClass = 'mw-magiclink-pmid';
1156                                 $id = $m[4];
1157                         } else {
1158                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1159                                         substr( $m[0], 0, 20 ) . '"' );
1160                         }
1161                         $url = wfMsgForContent( $urlmsg, $id);
1162                         $sk = $this->mOptions->getSkin( $this->mTitle );
1163                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
1164                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1165                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1166                         # ISBN
1167                         $isbn = $m[5];
1168                         $num = strtr( $isbn, array(
1169                                 '-' => '',
1170                                 ' ' => '',
1171                                 'x' => 'X',
1172                         ));
1173                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1174                         return'<a href="' .
1175                                 $titleObj->escapeLocalUrl() .
1176                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1177                 } else {
1178                         return $m[0];
1179                 }
1180         }
1181
1182         /**
1183          * Make a free external link, given a user-supplied URL
1184          * @return HTML
1185          * @private
1186          */
1187         function makeFreeExternalLink( $url ) {
1188                 global $wgContLang;
1189                 wfProfileIn( __METHOD__ );
1190
1191                 $sk = $this->mOptions->getSkin( $this->mTitle );
1192                 $trail = '';
1193
1194                 # The characters '<' and '>' (which were escaped by
1195                 # removeHTMLtags()) should not be included in
1196                 # URLs, per RFC 2396.
1197                 $m2 = array();
1198                 if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1199                         $trail = substr( $url, $m2[0][1] ) . $trail;
1200                         $url = substr( $url, 0, $m2[0][1] );
1201                 }
1202
1203                 # Move trailing punctuation to $trail
1204                 $sep = ',;\.:!?';
1205                 # If there is no left bracket, then consider right brackets fair game too
1206                 if ( strpos( $url, '(' ) === false ) {
1207                         $sep .= ')';
1208                 }
1209
1210                 $numSepChars = strspn( strrev( $url ), $sep );
1211                 if ( $numSepChars ) {
1212                         $trail = substr( $url, -$numSepChars ) . $trail;
1213                         $url = substr( $url, 0, -$numSepChars );
1214                 }
1215
1216                 $url = Sanitizer::cleanUrl( $url );
1217
1218                 # Is this an external image?
1219                 $text = $this->maybeMakeExternalImage( $url );
1220                 if ( $text === false ) {
1221                         # Not an image, make a link
1222                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1223                                 $this->getExternalLinkAttribs( $url ) );
1224                         # Register it in the output object...
1225                         # Replace unnecessary URL escape codes with their equivalent characters
1226                         $pasteurized = self::replaceUnusualEscapes( $url );
1227                         $this->mOutput->addExternalLink( $pasteurized );
1228                 }
1229                 wfProfileOut( __METHOD__ );
1230                 return $text . $trail;
1231         }
1232
1233
1234         /**
1235          * Parse headers and return html
1236          *
1237          * @private
1238          */
1239         function doHeadings( $text ) {
1240                 wfProfileIn( __METHOD__ );
1241                 for ( $i = 6; $i >= 1; --$i ) {
1242                         $h = str_repeat( '=', $i );
1243                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1244                           "<h$i>\\1</h$i>", $text );
1245                 }
1246                 wfProfileOut( __METHOD__ );
1247                 return $text;
1248         }
1249
1250         /**
1251          * Replace single quotes with HTML markup
1252          * @private
1253          * @return string the altered text
1254          */
1255         function doAllQuotes( $text ) {
1256                 wfProfileIn( __METHOD__ );
1257                 $outtext = '';
1258                 $lines = StringUtils::explode( "\n", $text );
1259                 foreach ( $lines as $line ) {
1260                         $outtext .= $this->doQuotes( $line ) . "\n";
1261                 }
1262                 $outtext = substr( $outtext, 0,-1 );
1263                 wfProfileOut( __METHOD__ );
1264                 return $outtext;
1265         }
1266
1267         /**
1268          * Helper function for doAllQuotes()
1269          */
1270         public function doQuotes( $text ) {
1271                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1272                 if ( count( $arr ) == 1 ) {
1273                         return $text;
1274                 } else {
1275                         # First, do some preliminary work. This may shift some apostrophes from
1276                         # being mark-up to being text. It also counts the number of occurrences
1277                         # of bold and italics mark-ups.
1278                         $numbold = 0;
1279                         $numitalics = 0;
1280                         for ( $i = 0; $i < count( $arr ); $i++ ) {
1281                                 if ( ( $i % 2 ) == 1 ) {
1282                                         # If there are ever four apostrophes, assume the first is supposed to
1283                                         # be text, and the remaining three constitute mark-up for bold text.
1284                                         if ( strlen( $arr[$i] ) == 4 ) {
1285                                                 $arr[$i-1] .= "'";
1286                                                 $arr[$i] = "'''";
1287                                         } elseif ( strlen( $arr[$i] ) > 5 ) {
1288                                                 # If there are more than 5 apostrophes in a row, assume they're all
1289                                                 # text except for the last 5.
1290                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1291                                                 $arr[$i] = "'''''";
1292                                         }
1293                                         # Count the number of occurrences of bold and italics mark-ups.
1294                                         # We are not counting sequences of five apostrophes.
1295                                         if ( strlen( $arr[$i] ) == 2 ) {
1296                                                 $numitalics++;
1297                                         } elseif ( strlen( $arr[$i] ) == 3 ) {
1298                                                 $numbold++;
1299                                         } elseif ( strlen( $arr[$i] ) == 5 ) {
1300                                                 $numitalics++;
1301                                                 $numbold++;
1302                                         }
1303                                 }
1304                         }
1305
1306                         # If there is an odd number of both bold and italics, it is likely
1307                         # that one of the bold ones was meant to be an apostrophe followed
1308                         # by italics. Which one we cannot know for certain, but it is more
1309                         # likely to be one that has a single-letter word before it.
1310                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) ) {
1311                                 $i = 0;
1312                                 $firstsingleletterword = -1;
1313                                 $firstmultiletterword = -1;
1314                                 $firstspace = -1;
1315                                 foreach ( $arr as $r ) {
1316                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) ) {
1317                                                 $x1 = substr( $arr[$i-1], -1 );
1318                                                 $x2 = substr( $arr[$i-1], -2, 1 );
1319                                                 if ( $x1 === ' ' ) {
1320                                                         if ( $firstspace == -1 ) {
1321                                                                 $firstspace = $i;
1322                                                         }
1323                                                 } elseif ( $x2 === ' ') {
1324                                                         if ( $firstsingleletterword == -1 ) {
1325                                                                 $firstsingleletterword = $i;
1326                                                         }
1327                                                 } else {
1328                                                         if ( $firstmultiletterword == -1 ) {
1329                                                                 $firstmultiletterword = $i;
1330                                                         }
1331                                                 }
1332                                         }
1333                                         $i++;
1334                                 }
1335
1336                                 # If there is a single-letter word, use it!
1337                                 if ( $firstsingleletterword > -1 ) {
1338                                         $arr[$firstsingleletterword] = "''";
1339                                         $arr[$firstsingleletterword-1] .= "'";
1340                                 } elseif ( $firstmultiletterword > -1 ) {
1341                                         # If not, but there's a multi-letter word, use that one.
1342                                         $arr[$firstmultiletterword] = "''";
1343                                         $arr[$firstmultiletterword-1] .= "'";
1344                                 } elseif ( $firstspace > -1 ) {
1345                                         # ... otherwise use the first one that has neither.
1346                                         # (notice that it is possible for all three to be -1 if, for example,
1347                                         # there is only one pentuple-apostrophe in the line)
1348                                         $arr[$firstspace] = "''";
1349                                         $arr[$firstspace-1] .= "'";
1350                                 }
1351                         }
1352
1353                         # Now let's actually convert our apostrophic mush to HTML!
1354                         $output = '';
1355                         $buffer = '';
1356                         $state = '';
1357                         $i = 0;
1358                         foreach ( $arr as $r ) {
1359                                 if ( ( $i % 2 ) == 0 ) {
1360                                         if ( $state === 'both' ) {
1361                                                 $buffer .= $r;
1362                                         } else {
1363                                                 $output .= $r;
1364                                         }
1365                                 } else {
1366                                         if ( strlen( $r ) == 2 ) {
1367                                                 if ( $state === 'i' ) {
1368                                                         $output .= '</i>'; $state = '';
1369                                                 } elseif ( $state === 'bi' ) {
1370                                                         $output .= '</i>'; $state = 'b';
1371                                                 } elseif ( $state === 'ib' ) {
1372                                                         $output .= '</b></i><b>'; $state = 'b';
1373                                                 } elseif ( $state === 'both' ) {
1374                                                         $output .= '<b><i>'.$buffer.'</i>'; $state = 'b';
1375                                                 } else { # $state can be 'b' or ''
1376                                                         $output .= '<i>'; $state .= 'i';
1377                                                 }
1378                                         } elseif ( strlen( $r ) == 3 ) {
1379                                                 if ( $state === 'b' ) {
1380                                                         $output .= '</b>'; $state = '';
1381                                                 } elseif ( $state === 'bi' ) {
1382                                                         $output .= '</i></b><i>'; $state = 'i';
1383                                                 } elseif ( $state === 'ib' ) {
1384                                                         $output .= '</b>'; $state = 'i';
1385                                                 } elseif ( $state === 'both' ) {
1386                                                         $output .= '<i><b>'.$buffer.'</b>'; $state = 'i';
1387                                                 } else { # $state can be 'i' or ''
1388                                                         $output .= '<b>'; $state .= 'b';
1389                                                 }
1390                                         } elseif ( strlen( $r ) == 5 ) {
1391                                                 if ( $state === 'b' ) {
1392                                                         $output .= '</b><i>'; $state = 'i';
1393                                                 } elseif ( $state === 'i' ) {
1394                                                         $output .= '</i><b>'; $state = 'b';
1395                                                 } elseif ( $state === 'bi' ) {
1396                                                         $output .= '</i></b>'; $state = '';
1397                                                 } elseif ( $state === 'ib' ) {
1398                                                         $output .= '</b></i>'; $state = '';
1399                                                 } elseif ( $state === 'both' ) {
1400                                                         $output .= '<i><b>'.$buffer.'</b></i>'; $state = '';
1401                                                 } else { # ($state == '')
1402                                                         $buffer = ''; $state = 'both';
1403                                                 }
1404                                         }
1405                                 }
1406                                 $i++;
1407                         }
1408                         # Now close all remaining tags.  Notice that the order is important.
1409                         if ( $state === 'b' || $state === 'ib' ) {
1410                                 $output .= '</b>';
1411                         }
1412                         if ( $state === 'i' || $state === 'bi' || $state === 'ib' ) {
1413                                 $output .= '</i>';
1414                         }
1415                         if ( $state === 'bi' ) {
1416                                 $output .= '</b>';
1417                         }
1418                         # There might be lonely ''''', so make sure we have a buffer
1419                         if ( $state === 'both' && $buffer ) {
1420                                 $output .= '<b><i>'.$buffer.'</i></b>';
1421                         }
1422                         return $output;
1423                 }
1424         }
1425
1426         /**
1427          * Replace external links (REL)
1428          *
1429          * Note: this is all very hackish and the order of execution matters a lot.
1430          * Make sure to run maintenance/parserTests.php if you change this code.
1431          *
1432          * @private
1433          */
1434         function replaceExternalLinks( $text ) {
1435                 global $wgContLang;
1436                 wfProfileIn( __METHOD__ );
1437
1438                 $sk = $this->mOptions->getSkin( $this->mTitle );
1439
1440                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1441                 $s = array_shift( $bits );
1442
1443                 $i = 0;
1444                 while ( $i<count( $bits ) ) {
1445                         $url = $bits[$i++];
1446                         $protocol = $bits[$i++];
1447                         $text = $bits[$i++];
1448                         $trail = $bits[$i++];
1449
1450                         # The characters '<' and '>' (which were escaped by
1451                         # removeHTMLtags()) should not be included in
1452                         # URLs, per RFC 2396.
1453                         $m2 = array();
1454                         if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1455                                 $text = substr( $url, $m2[0][1] ) . ' ' . $text;
1456                                 $url = substr( $url, 0, $m2[0][1] );
1457                         }
1458
1459                         # If the link text is an image URL, replace it with an <img> tag
1460                         # This happened by accident in the original parser, but some people used it extensively
1461                         $img = $this->maybeMakeExternalImage( $text );
1462                         if ( $img !== false ) {
1463                                 $text = $img;
1464                         }
1465
1466                         $dtrail = '';
1467
1468                         # Set linktype for CSS - if URL==text, link is essentially free
1469                         $linktype = ( $text === $url ) ? 'free' : 'text';
1470
1471                         # No link text, e.g. [http://domain.tld/some.link]
1472                         if ( $text == '' ) {
1473                                 # Autonumber if allowed. See bug #5918
1474                                 if ( strpos( wfUrlProtocols(), substr( $protocol, 0, strpos( $protocol, ':' ) ) ) !== false ) {
1475                                         $langObj = $this->getFunctionLang();
1476                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1477                                         $linktype = 'autonumber';
1478                                 } else {
1479                                         # Otherwise just use the URL
1480                                         $text = htmlspecialchars( $url );
1481                                         $linktype = 'free';
1482                                 }
1483                         } else {
1484                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1485                                 # Check for trail
1486                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1487                         }
1488
1489                         $text = $wgContLang->markNoConversion( $text );
1490
1491                         $url = Sanitizer::cleanUrl( $url );
1492
1493                         # Use the encoded URL
1494                         # This means that users can paste URLs directly into the text
1495                         # Funny characters like ö aren't valid in URLs anyway
1496                         # This was changed in August 2004
1497                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1498                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1499
1500                         # Register link in the output object.
1501                         # Replace unnecessary URL escape codes with the referenced character
1502                         # This prevents spammers from hiding links from the filters
1503                         $pasteurized = self::replaceUnusualEscapes( $url );
1504                         $this->mOutput->addExternalLink( $pasteurized );
1505                 }
1506
1507                 wfProfileOut( __METHOD__ );
1508                 return $s;
1509         }
1510
1511         /**
1512          * Get an associative array of additional HTML attributes appropriate for a
1513          * particular external link.  This currently may include rel => nofollow
1514          * (depending on configuration, namespace, and the URL's domain) and/or a
1515          * target attribute (depending on configuration).
1516          *
1517          * @param $url String: optional URL, to extract the domain from for rel =>
1518          *   nofollow if appropriate
1519          * @return Array: associative array of HTML attributes
1520          */
1521         function getExternalLinkAttribs( $url = false ) {
1522                 $attribs = array();
1523                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1524                 $ns = $this->mTitle->getNamespace();
1525                 if ( $wgNoFollowLinks && !in_array( $ns, $wgNoFollowNsExceptions ) ) {
1526                         $attribs['rel'] = 'nofollow';
1527
1528                         global $wgNoFollowDomainExceptions;
1529                         if ( $wgNoFollowDomainExceptions ) {
1530                                 $bits = wfParseUrl( $url );
1531                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1532                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1533                                                 if ( substr( $bits['host'], -strlen( $domain ) ) == $domain ) {
1534                                                         unset( $attribs['rel'] );
1535                                                         break;
1536                                                 }
1537                                         }
1538                                 }
1539                         }
1540                 }
1541                 if ( $this->mOptions->getExternalLinkTarget() ) {
1542                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1543                 }
1544                 return $attribs;
1545         }
1546
1547
1548         /**
1549          * Replace unusual URL escape codes with their equivalent characters
1550          *
1551          * @param $url String
1552          * @return String
1553          *
1554          * @todo  This can merge genuinely required bits in the path or query string,
1555          *        breaking legit URLs. A proper fix would treat the various parts of
1556          *        the URL differently; as a workaround, just use the output for
1557          *        statistical records, not for actual linking/output.
1558          */
1559         static function replaceUnusualEscapes( $url ) {
1560                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1561                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1562         }
1563
1564         /**
1565          * Callback function used in replaceUnusualEscapes().
1566          * Replaces unusual URL escape codes with their equivalent character
1567          */
1568         private static function replaceUnusualEscapesCallback( $matches ) {
1569                 $char = urldecode( $matches[0] );
1570                 $ord = ord( $char );
1571                 # Is it an unsafe or HTTP reserved character according to RFC 1738?
1572                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1573                         # No, shouldn't be escaped
1574                         return $char;
1575                 } else {
1576                         # Yes, leave it escaped
1577                         return $matches[0];
1578                 }
1579         }
1580
1581         /**
1582          * make an image if it's allowed, either through the global
1583          * option, through the exception, or through the on-wiki whitelist
1584          * @private
1585          */
1586         function maybeMakeExternalImage( $url ) {
1587                 $sk = $this->mOptions->getSkin( $this->mTitle );
1588                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1589                 $imagesexception = !empty( $imagesfrom );
1590                 $text = false;
1591                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1592                 if ( $imagesexception && is_array( $imagesfrom ) ) {
1593                         $imagematch = false;
1594                         foreach ( $imagesfrom as $match ) {
1595                                 if ( strpos( $url, $match ) === 0 ) {
1596                                         $imagematch = true;
1597                                         break;
1598                                 }
1599                         }
1600                 } elseif ( $imagesexception ) {
1601                         $imagematch = ( strpos( $url, $imagesfrom ) === 0 );
1602                 } else {
1603                         $imagematch = false;
1604                 }
1605                 if ( $this->mOptions->getAllowExternalImages()
1606                          || ( $imagesexception && $imagematch ) ) {
1607                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1608                                 # Image found
1609                                 $text = $sk->makeExternalImage( $url );
1610                         }
1611                 }
1612                 if ( !$text && $this->mOptions->getEnableImageWhitelist()
1613                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1614                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1615                         foreach ( $whitelist as $entry ) {
1616                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1617                                 if ( strpos( $entry, '#' ) === 0 || $entry === '' ) {
1618                                         continue;
1619                                 }
1620                                 if ( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1621                                         # Image matches a whitelist entry
1622                                         $text = $sk->makeExternalImage( $url );
1623                                         break;
1624                                 }
1625                         }
1626                 }
1627                 return $text;
1628         }
1629
1630         /**
1631          * Process [[ ]] wikilinks
1632          * @return String: processed text
1633          *
1634          * @private
1635          */
1636         function replaceInternalLinks( $s ) {
1637                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1638                 return $s;
1639         }
1640
1641         /**
1642          * Process [[ ]] wikilinks (RIL)
1643          * @return LinkHolderArray
1644          *
1645          * @private
1646          */
1647         function replaceInternalLinks2( &$s ) {
1648                 global $wgContLang;
1649
1650                 wfProfileIn( __METHOD__ );
1651
1652                 wfProfileIn( __METHOD__.'-setup' );
1653                 static $tc = FALSE, $e1, $e1_img;
1654                 # the % is needed to support urlencoded titles as well
1655                 if ( !$tc ) {
1656                         $tc = Title::legalChars() . '#%';
1657                         # Match a link having the form [[namespace:link|alternate]]trail
1658                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1659                         # Match cases where there is no "]]", which might still be images
1660                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1661                 }
1662
1663                 $sk = $this->mOptions->getSkin( $this->mTitle );
1664                 $holders = new LinkHolderArray( $this );
1665
1666                 # split the entire text string on occurences of [[
1667                 $a = StringUtils::explode( '[[', ' ' . $s );
1668                 # get the first element (all text up to first [[), and remove the space we added
1669                 $s = $a->current();
1670                 $a->next();
1671                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1672                 $s = substr( $s, 1 );
1673
1674                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1675                 $e2 = null;
1676                 if ( $useLinkPrefixExtension ) {
1677                         # Match the end of a line for a word that's not followed by whitespace,
1678                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1679                         $e2 = wfMsgForContent( 'linkprefix' );
1680                 }
1681
1682                 if ( is_null( $this->mTitle ) ) {
1683                         wfProfileOut( __METHOD__.'-setup' );
1684                         wfProfileOut( __METHOD__ );
1685                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1686                 }
1687                 $nottalk = !$this->mTitle->isTalkPage();
1688
1689                 if ( $useLinkPrefixExtension ) {
1690                         $m = array();
1691                         if ( preg_match( $e2, $s, $m ) ) {
1692                                 $first_prefix = $m[2];
1693                         } else {
1694                                 $first_prefix = false;
1695                         }
1696                 } else {
1697                         $prefix = '';
1698                 }
1699
1700                 if ( $wgContLang->hasVariants() ) {
1701                         $selflink = $wgContLang->autoConvertToAllVariants( $this->mTitle->getPrefixedText() );
1702                 } else {
1703                         $selflink = array( $this->mTitle->getPrefixedText() );
1704                 }
1705                 $useSubpages = $this->areSubpagesAllowed();
1706                 wfProfileOut( __METHOD__.'-setup' );
1707
1708                 # Loop for each link
1709                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1710                         # Check for excessive memory usage
1711                         if ( $holders->isBig() ) {
1712                                 # Too big
1713                                 # Do the existence check, replace the link holders and clear the array
1714                                 $holders->replace( $s );
1715                                 $holders->clear();
1716                         }
1717
1718                         if ( $useLinkPrefixExtension ) {
1719                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1720                                 if ( preg_match( $e2, $s, $m ) ) {
1721                                         $prefix = $m[2];
1722                                         $s = $m[1];
1723                                 } else {
1724                                         $prefix='';
1725                                 }
1726                                 # first link
1727                                 if ( $first_prefix ) {
1728                                         $prefix = $first_prefix;
1729                                         $first_prefix = false;
1730                                 }
1731                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1732                         }
1733
1734                         $might_be_img = false;
1735
1736                         wfProfileIn( __METHOD__."-e1" );
1737                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1738                                 $text = $m[2];
1739                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1740                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1741                                 # the real problem is with the $e1 regex
1742                                 # See bug 1300.
1743                                 #
1744                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1745                                 # and no image is in sight. See bug 2095.
1746                                 #
1747                                 if ( $text !== '' &&
1748                                         substr( $m[3], 0, 1 ) === ']' &&
1749                                         strpos( $text, '[' ) !== false
1750                                 )
1751                                 {
1752                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1753                                         $m[3] = substr( $m[3], 1 );
1754                                 }
1755                                 # fix up urlencoded title texts
1756                                 if ( strpos( $m[1], '%' ) !== false ) {
1757                                         # Should anchors '#' also be rejected?
1758                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), rawurldecode( $m[1] ) );
1759                                 }
1760                                 $trail = $m[3];
1761                         } elseif ( preg_match( $e1_img, $line, $m ) ) { # Invalid, but might be an image with a link in its caption
1762                                 $might_be_img = true;
1763                                 $text = $m[2];
1764                                 if ( strpos( $m[1], '%' ) !== false ) {
1765                                         $m[1] = rawurldecode( $m[1] );
1766                                 }
1767                                 $trail = "";
1768                         } else { # Invalid form; output directly
1769                                 $s .= $prefix . '[[' . $line ;
1770                                 wfProfileOut( __METHOD__."-e1" );
1771                                 continue;
1772                         }
1773                         wfProfileOut( __METHOD__."-e1" );
1774                         wfProfileIn( __METHOD__."-misc" );
1775
1776                         # Don't allow internal links to pages containing
1777                         # PROTO: where PROTO is a valid URL protocol; these
1778                         # should be external links.
1779                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1780                                 $s .= $prefix . '[[' . $line ;
1781                                 wfProfileOut( __METHOD__."-misc" );
1782                                 continue;
1783                         }
1784
1785                         # Make subpage if necessary
1786                         if ( $useSubpages ) {
1787                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1788                         } else {
1789                                 $link = $m[1];
1790                         }
1791
1792                         $noforce = ( substr( $m[1], 0, 1 ) !== ':' );
1793                         if ( !$noforce ) {
1794                                 # Strip off leading ':'
1795                                 $link = substr( $link, 1 );
1796                         }
1797
1798                         wfProfileOut( __METHOD__."-misc" );
1799                         wfProfileIn( __METHOD__."-title" );
1800                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1801                         if ( $nt === null ) {
1802                                 $s .= $prefix . '[[' . $line;
1803                                 wfProfileOut( __METHOD__."-title" );
1804                                 continue;
1805                         }
1806
1807                         $ns = $nt->getNamespace();
1808                         $iw = $nt->getInterWiki();
1809                         wfProfileOut( __METHOD__."-title" );
1810
1811                         if ( $might_be_img ) { # if this is actually an invalid link
1812                                 wfProfileIn( __METHOD__."-might_be_img" );
1813                                 if ( $ns == NS_FILE && $noforce ) { # but might be an image
1814                                         $found = false;
1815                                         while ( true ) {
1816                                                 # look at the next 'line' to see if we can close it there
1817                                                 $a->next();
1818                                                 $next_line = $a->current();
1819                                                 if ( $next_line === false || $next_line === null ) {
1820                                                         break;
1821                                                 }
1822                                                 $m = explode( ']]', $next_line, 3 );
1823                                                 if ( count( $m ) == 3 ) {
1824                                                         # the first ]] closes the inner link, the second the image
1825                                                         $found = true;
1826                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1827                                                         $trail = $m[2];
1828                                                         break;
1829                                                 } elseif ( count( $m ) == 2 ) {
1830                                                         # if there's exactly one ]] that's fine, we'll keep looking
1831                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1832                                                 } else {
1833                                                         # if $next_line is invalid too, we need look no further
1834                                                         $text .= '[[' . $next_line;
1835                                                         break;
1836                                                 }
1837                                         }
1838                                         if ( !$found ) {
1839                                                 # we couldn't find the end of this imageLink, so output it raw
1840                                                 # but don't ignore what might be perfectly normal links in the text we've examined
1841                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1842                                                 $s .= "{$prefix}[[$link|$text";
1843                                                 # note: no $trail, because without an end, there *is* no trail
1844                                                 wfProfileOut( __METHOD__."-might_be_img" );
1845                                                 continue;
1846                                         }
1847                                 } else { # it's not an image, so output it raw
1848                                         $s .= "{$prefix}[[$link|$text";
1849                                         # note: no $trail, because without an end, there *is* no trail
1850                                         wfProfileOut( __METHOD__."-might_be_img" );
1851                                         continue;
1852                                 }
1853                                 wfProfileOut( __METHOD__."-might_be_img" );
1854                         }
1855
1856                         $wasblank = ( $text  == '' );
1857                         if ( $wasblank ) {
1858                                 $text = $link;
1859                         } else {
1860                                 # Bug 4598 madness. Handle the quotes only if they come from the alternate part
1861                                 # [[Lista d''e paise d''o munno]] -> <a href="...">Lista d''e paise d''o munno</a>
1862                                 # [[Criticism of Harry Potter|Criticism of ''Harry Potter'']]
1863                                 #    -> <a href="Criticism of Harry Potter">Criticism of <i>Harry Potter</i></a>
1864                                 $text = $this->doQuotes( $text );
1865                         }
1866
1867                         # Link not escaped by : , create the various objects
1868                         if ( $noforce ) {
1869
1870                                 # Interwikis
1871                                 wfProfileIn( __METHOD__."-interwiki" );
1872                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1873                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1874                                         $s = rtrim( $s . $prefix );
1875                                         $s .= trim( $trail, "\n" ) == '' ? '': $prefix . $trail;
1876                                         wfProfileOut( __METHOD__."-interwiki" );
1877                                         continue;
1878                                 }
1879                                 wfProfileOut( __METHOD__."-interwiki" );
1880
1881                                 if ( $ns == NS_FILE ) {
1882                                         wfProfileIn( __METHOD__."-image" );
1883                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1884                                                 if ( $wasblank ) {
1885                                                         # if no parameters were passed, $text
1886                                                         # becomes something like "File:Foo.png",
1887                                                         # which we don't want to pass on to the
1888                                                         # image generator
1889                                                         $text = '';
1890                                                 } else {
1891                                                         # recursively parse links inside the image caption
1892                                                         # actually, this will parse them in any other parameters, too,
1893                                                         # but it might be hard to fix that, and it doesn't matter ATM
1894                                                         $text = $this->replaceExternalLinks( $text );
1895                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1896                                                 }
1897                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1898                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1899                                         } else {
1900                                                 $s .= $prefix . $trail;
1901                                         }
1902                                         $this->mOutput->addImage( $nt->getDBkey() );
1903                                         wfProfileOut( __METHOD__."-image" );
1904                                         continue;
1905
1906                                 }
1907
1908                                 if ( $ns == NS_CATEGORY ) {
1909                                         wfProfileIn( __METHOD__."-category" );
1910                                         $s = rtrim( $s . "\n" ); # bug 87
1911
1912                                         if ( $wasblank ) {
1913                                                 $sortkey = $this->getDefaultSort();
1914                                         } else {
1915                                                 $sortkey = $text;
1916                                         }
1917                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1918                                         $sortkey = str_replace( "\n", '', $sortkey );
1919                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1920                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1921
1922                                         /**
1923                                          * Strip the whitespace Category links produce, see bug 87
1924                                          * @todo We might want to use trim($tmp, "\n") here.
1925                                          */
1926                                         $s .= trim( $prefix . $trail, "\n" ) == '' ? '' : $prefix . $trail;
1927
1928                                         wfProfileOut( __METHOD__."-category" );
1929                                         continue;
1930                                 }
1931                         }
1932
1933                         # Self-link checking
1934                         if ( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1935                                 if ( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1936                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1937                                         continue;
1938                                 }
1939                         }
1940
1941                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1942                         # FIXME: Should do batch file existence checks, see comment below
1943                         if ( $ns == NS_MEDIA ) {
1944                                 wfProfileIn( __METHOD__."-media" );
1945                                 # Give extensions a chance to select the file revision for us
1946                                 $skip = $time = false;
1947                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1948                                 if ( $skip ) {
1949                                         $link = $sk->link( $nt );
1950                                 } else {
1951                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1952                                 }
1953                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1954                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1955                                 $this->mOutput->addImage( $nt->getDBkey() );
1956                                 wfProfileOut( __METHOD__."-media" );
1957                                 continue;
1958                         }
1959
1960                         wfProfileIn( __METHOD__."-always_known" );
1961                         # Some titles, such as valid special pages or files in foreign repos, should
1962                         # be shown as bluelinks even though they're not included in the page table
1963                         #
1964                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1965                         # batch file existence checks for NS_FILE and NS_MEDIA
1966                         if ( $iw == '' && $nt->isAlwaysKnown() ) {
1967                                 $this->mOutput->addLink( $nt );
1968                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1969                         } else {
1970                                 # Links will be added to the output link list after checking
1971                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1972                         }
1973                         wfProfileOut( __METHOD__."-always_known" );
1974                 }
1975                 wfProfileOut( __METHOD__ );
1976                 return $holders;
1977         }
1978
1979         /**
1980          * Make a link placeholder. The text returned can be later resolved to a real link with
1981          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1982          * parsing of interwiki links, and secondly to allow all existence checks and
1983          * article length checks (for stub links) to be bundled into a single query.
1984          *
1985          * @deprecated
1986          */
1987         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1988                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1989         }
1990
1991         /**
1992          * Render a forced-blue link inline; protect against double expansion of
1993          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1994          * Since this little disaster has to split off the trail text to avoid
1995          * breaking URLs in the following text without breaking trails on the
1996          * wiki links, it's been made into a horrible function.
1997          *
1998          * @param $nt Title
1999          * @param $text String
2000          * @param $query String
2001          * @param $trail String
2002          * @param $prefix String
2003          * @return String: HTML-wikitext mix oh yuck
2004          */
2005         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2006                 list( $inside, $trail ) = Linker::splitTrail( $trail );
2007                 $sk = $this->mOptions->getSkin( $this->mTitle );
2008                 # FIXME: use link() instead of deprecated makeKnownLinkObj()
2009                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
2010                 return $this->armorLinks( $link ) . $trail;
2011         }
2012
2013         /**
2014          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
2015          * going to go through further parsing steps before inline URL expansion.
2016          *
2017          * Not needed quite as much as it used to be since free links are a bit
2018          * more sensible these days. But bracketed links are still an issue.
2019          *
2020          * @param $text String: more-or-less HTML
2021          * @return String: less-or-more HTML with NOPARSE bits
2022          */
2023         function armorLinks( $text ) {
2024                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
2025                         "{$this->mUniqPrefix}NOPARSE$1", $text );
2026         }
2027
2028         /**
2029          * Return true if subpage links should be expanded on this page.
2030          * @return Boolean
2031          */
2032         function areSubpagesAllowed() {
2033                 # Some namespaces don't allow subpages
2034                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
2035         }
2036
2037         /**
2038          * Handle link to subpage if necessary
2039          *
2040          * @param $target String: the source of the link
2041          * @param &$text String: the link text, modified as necessary
2042          * @return string the full name of the link
2043          * @private
2044          */
2045         function maybeDoSubpageLink( $target, &$text ) {
2046                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
2047         }
2048
2049         /**#@+
2050          * Used by doBlockLevels()
2051          * @private
2052          */
2053         function closeParagraph() {
2054                 $result = '';
2055                 if ( $this->mLastSection != '' ) {
2056                         $result = '</' . $this->mLastSection  . ">\n";
2057                 }
2058                 $this->mInPre = false;
2059                 $this->mLastSection = '';
2060                 return $result;
2061         }
2062
2063         /**
2064          * getCommon() returns the length of the longest common substring
2065          * of both arguments, starting at the beginning of both.
2066          * @private
2067          */
2068         function getCommon( $st1, $st2 ) {
2069                 $fl = strlen( $st1 );
2070                 $shorter = strlen( $st2 );
2071                 if ( $fl < $shorter ) {
2072                         $shorter = $fl;
2073                 }
2074
2075                 for ( $i = 0; $i < $shorter; ++$i ) {
2076                         if ( $st1{$i} != $st2{$i} ) {
2077                                 break;
2078                         }
2079                 }
2080                 return $i;
2081         }
2082
2083         /**
2084          * These next three functions open, continue, and close the list
2085          * element appropriate to the prefix character passed into them.
2086          * @private
2087          */
2088         function openList( $char ) {
2089                 $result = $this->closeParagraph();
2090
2091                 if ( '*' === $char ) {
2092                         $result .= '<ul><li>';
2093                 } elseif ( '#' === $char ) {
2094                         $result .= '<ol><li>';
2095                 } elseif ( ':' === $char ) {
2096                         $result .= '<dl><dd>';
2097                 } elseif ( ';' === $char ) {
2098                         $result .= '<dl><dt>';
2099                         $this->mDTopen = true;
2100                 } else {
2101                         $result = '<!-- ERR 1 -->';
2102                 }
2103
2104                 return $result;
2105         }
2106
2107         /**
2108          * TODO: document
2109          * @param $char String
2110          * @private
2111          */
2112         function nextItem( $char ) {
2113                 if ( '*' === $char || '#' === $char ) {
2114                         return '</li><li>';
2115                 } elseif ( ':' === $char || ';' === $char ) {
2116                         $close = '</dd>';
2117                         if ( $this->mDTopen ) {
2118                                 $close = '</dt>';
2119                         }
2120                         if ( ';' === $char ) {
2121                                 $this->mDTopen = true;
2122                                 return $close . '<dt>';
2123                         } else {
2124                                 $this->mDTopen = false;
2125                                 return $close . '<dd>';
2126                         }
2127                 }
2128                 return '<!-- ERR 2 -->';
2129         }
2130
2131         /**
2132          * TODO: document
2133          * @param $char String
2134          * @private
2135          */
2136         function closeList( $char ) {
2137                 if ( '*' === $char ) {
2138                         $text = '</li></ul>';
2139                 } elseif ( '#' === $char ) {
2140                         $text = '</li></ol>';
2141                 } elseif ( ':' === $char ) {
2142                         if ( $this->mDTopen ) {
2143                                 $this->mDTopen = false;
2144                                 $text = '</dt></dl>';
2145                         } else {
2146                                 $text = '</dd></dl>';
2147                         }
2148                 } else {
2149                         return '<!-- ERR 3 -->';
2150                 }
2151                 return $text."\n";
2152         }
2153         /**#@-*/
2154
2155         /**
2156          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
2157          *
2158          * @param $text String
2159          * @param $linestart Boolean: whether or not this is at the start of a line.
2160          * @private
2161          * @return string the lists rendered as HTML
2162          */
2163         function doBlockLevels( $text, $linestart ) {
2164                 wfProfileIn( __METHOD__ );
2165
2166                 # Parsing through the text line by line.  The main thing
2167                 # happening here is handling of block-level elements p, pre,
2168                 # and making lists from lines starting with * # : etc.
2169                 #
2170                 $textLines = StringUtils::explode( "\n", $text );
2171
2172                 $lastPrefix = $output = '';
2173                 $this->mDTopen = $inBlockElem = false;
2174                 $prefixLength = 0;
2175                 $paragraphStack = false;
2176
2177                 foreach ( $textLines as $oLine ) {
2178                         # Fix up $linestart
2179                         if ( !$linestart ) {
2180                                 $output .= $oLine;
2181                                 $linestart = true;
2182                                 continue;
2183                         }
2184                         # * = ul
2185                         # # = ol
2186                         # ; = dt
2187                         # : = dd
2188
2189                         $lastPrefixLength = strlen( $lastPrefix );
2190                         $preCloseMatch = preg_match( '/<\\/pre/i', $oLine );
2191                         $preOpenMatch = preg_match( '/<pre/i', $oLine );
2192                         # If not in a <pre> element, scan for and figure out what prefixes are there.
2193                         if ( !$this->mInPre ) {
2194                                 # Multiple prefixes may abut each other for nested lists.
2195                                 $prefixLength = strspn( $oLine, '*#:;' );
2196                                 $prefix = substr( $oLine, 0, $prefixLength );
2197
2198                                 # eh?
2199                                 # ; and : are both from definition-lists, so they're equivalent
2200                                 #  for the purposes of determining whether or not we need to open/close
2201                                 #  elements.
2202                                 $prefix2 = str_replace( ';', ':', $prefix );
2203                                 $t = substr( $oLine, $prefixLength );
2204                                 $this->mInPre = (bool)$preOpenMatch;
2205                         } else {
2206                                 # Don't interpret any other prefixes in preformatted text
2207                                 $prefixLength = 0;
2208                                 $prefix = $prefix2 = '';
2209                                 $t = $oLine;
2210                         }
2211
2212                         # List generation
2213                         if ( $prefixLength && $lastPrefix === $prefix2 ) {
2214                                 # Same as the last item, so no need to deal with nesting or opening stuff
2215                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2216                                 $paragraphStack = false;
2217
2218                                 if ( substr( $prefix, -1 ) === ';') {
2219                                         # The one nasty exception: definition lists work like this:
2220                                         # ; title : definition text
2221                                         # So we check for : in the remainder text to split up the
2222                                         # title and definition, without b0rking links.
2223                                         $term = $t2 = '';
2224                                         if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2225                                                 $t = $t2;
2226                                                 $output .= $term . $this->nextItem( ':' );
2227                                         }
2228                                 }
2229                         } elseif ( $prefixLength || $lastPrefixLength ) {
2230                                 # We need to open or close prefixes, or both.
2231
2232                                 # Either open or close a level...
2233                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2234                                 $paragraphStack = false;
2235
2236                                 # Close all the prefixes which aren't shared.
2237                                 while ( $commonPrefixLength < $lastPrefixLength ) {
2238                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2239                                         --$lastPrefixLength;
2240                                 }
2241
2242                                 # Continue the current prefix if appropriate.
2243                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2244                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2245                                 }
2246
2247                                 # Open prefixes where appropriate.
2248                                 while ( $prefixLength > $commonPrefixLength ) {
2249                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2250                                         $output .= $this->openList( $char );
2251
2252                                         if ( ';' === $char ) {
2253                                                 # FIXME: This is dupe of code above
2254                                                 if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2255                                                         $t = $t2;
2256                                                         $output .= $term . $this->nextItem( ':' );
2257                                                 }
2258                                         }
2259                                         ++$commonPrefixLength;
2260                                 }
2261                                 $lastPrefix = $prefix2;
2262                         }
2263
2264                         # If we have no prefixes, go to paragraph mode.
2265                         if ( 0 == $prefixLength ) {
2266                                 wfProfileIn( __METHOD__."-paragraph" );
2267                                 # No prefix (not in list)--go to paragraph mode
2268                                 # XXX: use a stack for nestable elements like span, table and div
2269                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2270                                 $closematch = preg_match(
2271                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2272                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2273                                 if ( $openmatch or $closematch ) {
2274
2275                                         $paragraphStack = false;
2276                                         # TODO bug 5718: paragraph closed
2277                                         $output .= $this->closeParagraph();
2278                                         if ( $preOpenMatch and !$preCloseMatch ) {
2279                                                 $this->mInPre = true;
2280                                         }
2281                                         $inBlockElem = !$closematch;
2282                                 } elseif ( !$inBlockElem && !$this->mInPre ) {
2283                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' || trim( $t ) != '' ) ) {
2284                                                 # pre
2285                                                 if ( $this->mLastSection !== 'pre' ) {
2286                                                         $paragraphStack = false;
2287                                                         $output .= $this->closeParagraph().'<pre>';
2288                                                         $this->mLastSection = 'pre';
2289                                                 }
2290                                                 $t = substr( $t, 1 );
2291                                         } else {
2292                                                 # paragraph
2293                                                 if ( trim( $t ) === '' ) {
2294                                                         if ( $paragraphStack ) {
2295                                                                 $output .= $paragraphStack.'<br />';
2296                                                                 $paragraphStack = false;
2297                                                                 $this->mLastSection = 'p';
2298                                                         } else {
2299                                                                 if ( $this->mLastSection !== 'p' ) {
2300                                                                         $output .= $this->closeParagraph();
2301                                                                         $this->mLastSection = '';
2302                                                                         $paragraphStack = '<p>';
2303                                                                 } else {
2304                                                                         $paragraphStack = '</p><p>';
2305                                                                 }
2306                                                         }
2307                                                 } else {
2308                                                         if ( $paragraphStack ) {
2309                                                                 $output .= $paragraphStack;
2310                                                                 $paragraphStack = false;
2311                                                                 $this->mLastSection = 'p';
2312                                                         } elseif ( $this->mLastSection !== 'p' ) {
2313                                                                 $output .= $this->closeParagraph().'<p>';
2314                                                                 $this->mLastSection = 'p';
2315                                                         }
2316                                                 }
2317                                         }
2318                                 }
2319                                 wfProfileOut( __METHOD__."-paragraph" );
2320                         }
2321                         # somewhere above we forget to get out of pre block (bug 785)
2322                         if ( $preCloseMatch && $this->mInPre ) {
2323                                 $this->mInPre = false;
2324                         }
2325                         if ( $paragraphStack === false ) {
2326                                 $output .= $t."\n";
2327                         }
2328                 }
2329                 while ( $prefixLength ) {
2330                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2331                         --$prefixLength;
2332                 }
2333                 if ( $this->mLastSection != '' ) {
2334                         $output .= '</' . $this->mLastSection . '>';
2335                         $this->mLastSection = '';
2336                 }
2337
2338                 wfProfileOut( __METHOD__ );
2339                 return $output;
2340         }
2341
2342         /**
2343          * Split up a string on ':', ignoring any occurences inside tags
2344          * to prevent illegal overlapping.
2345          *
2346          * @param $str String: the string to split
2347          * @param &$before String: set to everything before the ':'
2348          * @param &$after String: set to everything after the ':'
2349          * return String: the position of the ':', or false if none found
2350          */
2351         function findColonNoLinks( $str, &$before, &$after ) {
2352                 wfProfileIn( __METHOD__ );
2353
2354                 $pos = strpos( $str, ':' );
2355                 if ( $pos === false ) {
2356                         # Nothing to find!
2357                         wfProfileOut( __METHOD__ );
2358                         return false;
2359                 }
2360
2361                 $lt = strpos( $str, '<' );
2362                 if ( $lt === false || $lt > $pos ) {
2363                         # Easy; no tag nesting to worry about
2364                         $before = substr( $str, 0, $pos );
2365                         $after = substr( $str, $pos+1 );
2366                         wfProfileOut( __METHOD__ );
2367                         return $pos;
2368                 }
2369
2370                 # Ugly state machine to walk through avoiding tags.
2371                 $state = self::COLON_STATE_TEXT;
2372                 $stack = 0;
2373                 $len = strlen( $str );
2374                 for( $i = 0; $i < $len; $i++ ) {
2375                         $c = $str{$i};
2376
2377                         switch( $state ) {
2378                         # (Using the number is a performance hack for common cases)
2379                         case 0: # self::COLON_STATE_TEXT:
2380                                 switch( $c ) {
2381                                 case "<":
2382                                         # Could be either a <start> tag or an </end> tag
2383                                         $state = self::COLON_STATE_TAGSTART;
2384                                         break;
2385                                 case ":":
2386                                         if ( $stack == 0 ) {
2387                                                 # We found it!
2388                                                 $before = substr( $str, 0, $i );
2389                                                 $after = substr( $str, $i + 1 );
2390                                                 wfProfileOut( __METHOD__ );
2391                                                 return $i;
2392                                         }
2393                                         # Embedded in a tag; don't break it.
2394                                         break;
2395                                 default:
2396                                         # Skip ahead looking for something interesting
2397                                         $colon = strpos( $str, ':', $i );
2398                                         if ( $colon === false ) {
2399                                                 # Nothing else interesting
2400                                                 wfProfileOut( __METHOD__ );
2401                                                 return false;
2402                                         }
2403                                         $lt = strpos( $str, '<', $i );
2404                                         if ( $stack === 0 ) {
2405                                                 if ( $lt === false || $colon < $lt ) {
2406                                                         # We found it!
2407                                                         $before = substr( $str, 0, $colon );
2408                                                         $after = substr( $str, $colon + 1 );
2409                                                         wfProfileOut( __METHOD__ );
2410                                                         return $i;
2411                                                 }
2412                                         }
2413                                         if ( $lt === false ) {
2414                                                 # Nothing else interesting to find; abort!
2415                                                 # We're nested, but there's no close tags left. Abort!
2416                                                 break 2;
2417                                         }
2418                                         # Skip ahead to next tag start
2419                                         $i = $lt;
2420                                         $state = self::COLON_STATE_TAGSTART;
2421                                 }
2422                                 break;
2423                         case 1: # self::COLON_STATE_TAG:
2424                                 # In a <tag>
2425                                 switch( $c ) {
2426                                 case ">":
2427                                         $stack++;
2428                                         $state = self::COLON_STATE_TEXT;
2429                                         break;
2430                                 case "/":
2431                                         # Slash may be followed by >?
2432                                         $state = self::COLON_STATE_TAGSLASH;
2433                                         break;
2434                                 default:
2435                                         # ignore
2436                                 }
2437                                 break;
2438                         case 2: # self::COLON_STATE_TAGSTART:
2439                                 switch( $c ) {
2440                                 case "/":
2441                                         $state = self::COLON_STATE_CLOSETAG;
2442                                         break;
2443                                 case "!":
2444                                         $state = self::COLON_STATE_COMMENT;
2445                                         break;
2446                                 case ">":
2447                                         # Illegal early close? This shouldn't happen D:
2448                                         $state = self::COLON_STATE_TEXT;
2449                                         break;
2450                                 default:
2451                                         $state = self::COLON_STATE_TAG;
2452                                 }
2453                                 break;
2454                         case 3: # self::COLON_STATE_CLOSETAG:
2455                                 # In a </tag>
2456                                 if ( $c === ">" ) {
2457                                         $stack--;
2458                                         if ( $stack < 0 ) {
2459                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2460                                                 wfProfileOut( __METHOD__ );
2461                                                 return false;
2462                                         }
2463                                         $state = self::COLON_STATE_TEXT;
2464                                 }
2465                                 break;
2466                         case self::COLON_STATE_TAGSLASH:
2467                                 if ( $c === ">" ) {
2468                                         # Yes, a self-closed tag <blah/>
2469                                         $state = self::COLON_STATE_TEXT;
2470                                 } else {
2471                                         # Probably we're jumping the gun, and this is an attribute
2472                                         $state = self::COLON_STATE_TAG;
2473                                 }
2474                                 break;
2475                         case 5: # self::COLON_STATE_COMMENT:
2476                                 if ( $c === "-" ) {
2477                                         $state = self::COLON_STATE_COMMENTDASH;
2478                                 }
2479                                 break;
2480                         case self::COLON_STATE_COMMENTDASH:
2481                                 if ( $c === "-" ) {
2482                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2483                                 } else {
2484                                         $state = self::COLON_STATE_COMMENT;
2485                                 }
2486                                 break;
2487                         case self::COLON_STATE_COMMENTDASHDASH:
2488                                 if ( $c === ">" ) {
2489                                         $state = self::COLON_STATE_TEXT;
2490                                 } else {
2491                                         $state = self::COLON_STATE_COMMENT;
2492                                 }
2493                                 break;
2494                         default:
2495                                 throw new MWException( "State machine error in " . __METHOD__ );
2496                         }
2497                 }
2498                 if ( $stack > 0 ) {
2499                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2500                         return false;
2501                 }
2502                 wfProfileOut( __METHOD__ );
2503                 return false;
2504         }
2505
2506         /**
2507          * Return value of a magic variable (like PAGENAME)
2508          *
2509          * @private
2510          */
2511         function getVariableValue( $index, $frame=false ) {
2512                 global $wgContLang, $wgSitename, $wgServer;
2513                 global $wgArticlePath, $wgScriptPath, $wgStylePath;
2514
2515                 /**
2516                  * Some of these require message or data lookups and can be
2517                  * expensive to check many times.
2518                  */
2519                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2520                         if ( isset( $this->mVarCache[$index] ) ) {
2521                                 return $this->mVarCache[$index];
2522                         }
2523                 }
2524
2525                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2526                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2527
2528                 # Use the time zone
2529                 global $wgLocaltimezone;
2530                 if ( isset( $wgLocaltimezone ) ) {
2531                         $oldtz = date_default_timezone_get();
2532                         date_default_timezone_set( $wgLocaltimezone );
2533                 }
2534
2535                 $localTimestamp = date( 'YmdHis', $ts );
2536                 $localMonth = date( 'm', $ts );
2537                 $localMonth1 = date( 'n', $ts );
2538                 $localMonthName = date( 'n', $ts );
2539                 $localDay = date( 'j', $ts );
2540                 $localDay2 = date( 'd', $ts );
2541                 $localDayOfWeek = date( 'w', $ts );
2542                 $localWeek = date( 'W', $ts );
2543                 $localYear = date( 'Y', $ts );
2544                 $localHour = date( 'H', $ts );
2545                 if ( isset( $wgLocaltimezone ) ) {
2546                         date_default_timezone_set( $oldtz );
2547                 }
2548
2549                 switch ( $index ) {
2550                         case 'currentmonth':
2551                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2552                                 break;
2553                         case 'currentmonth1':
2554                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2555                                 break;
2556                         case 'currentmonthname':
2557                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2558                                 break;
2559                         case 'currentmonthnamegen':
2560                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2561                                 break;
2562                         case 'currentmonthabbrev':
2563                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2564                                 break;
2565                         case 'currentday':
2566                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2567                                 break;
2568                         case 'currentday2':
2569                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2570                                 break;
2571                         case 'localmonth':
2572                                 $value = $wgContLang->formatNum( $localMonth );
2573                                 break;
2574                         case 'localmonth1':
2575                                 $value = $wgContLang->formatNum( $localMonth1 );
2576                                 break;
2577                         case 'localmonthname':
2578                                 $value = $wgContLang->getMonthName( $localMonthName );
2579                                 break;
2580                         case 'localmonthnamegen':
2581                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2582                                 break;
2583                         case 'localmonthabbrev':
2584                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2585                                 break;
2586                         case 'localday':
2587                                 $value = $wgContLang->formatNum( $localDay );
2588                                 break;
2589                         case 'localday2':
2590                                 $value = $wgContLang->formatNum( $localDay2 );
2591                                 break;
2592                         case 'pagename':
2593                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2594                                 break;
2595                         case 'pagenamee':
2596                                 $value = wfEscapeWikiText( $this->mTitle->getPartialURL() );
2597                                 break;
2598                         case 'fullpagename':
2599                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2600                                 break;
2601                         case 'fullpagenamee':
2602                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedURL() );
2603                                 break;
2604                         case 'subpagename':
2605                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2606                                 break;
2607                         case 'subpagenamee':
2608                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageUrlForm() );
2609                                 break;
2610                         case 'basepagename':
2611                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2612                                 break;
2613                         case 'basepagenamee':
2614                                 $value = wfEscapeWikiText( wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) ) );
2615                                 break;
2616                         case 'talkpagename':
2617                                 if ( $this->mTitle->canTalk() ) {
2618                                         $talkPage = $this->mTitle->getTalkPage();
2619                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2620                                 } else {
2621                                         $value = '';
2622                                 }
2623                                 break;
2624                         case 'talkpagenamee':
2625                                 if ( $this->mTitle->canTalk() ) {
2626                                         $talkPage = $this->mTitle->getTalkPage();
2627                                         $value = wfEscapeWikiText( $talkPage->getPrefixedUrl() );
2628                                 } else {
2629                                         $value = '';
2630                                 }
2631                                 break;
2632                         case 'subjectpagename':
2633                                 $subjPage = $this->mTitle->getSubjectPage();
2634                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2635                                 break;
2636                         case 'subjectpagenamee':
2637                                 $subjPage = $this->mTitle->getSubjectPage();
2638                                 $value = wfEscapeWikiText( $subjPage->getPrefixedUrl() );
2639                                 break;
2640                         case 'revisionid':
2641                                 # Let the edit saving system know we should parse the page
2642                                 # *after* a revision ID has been assigned.
2643                                 $this->mOutput->setFlag( 'vary-revision' );
2644                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2645                                 $value = $this->mRevisionId;
2646                                 break;
2647                         case 'revisionday':
2648                                 # Let the edit saving system know we should parse the page
2649                                 # *after* a revision ID has been assigned. This is for null edits.
2650                                 $this->mOutput->setFlag( 'vary-revision' );
2651                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2652                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2653                                 break;
2654                         case 'revisionday2':
2655                                 # Let the edit saving system know we should parse the page
2656                                 # *after* a revision ID has been assigned. This is for null edits.
2657                                 $this->mOutput->setFlag( 'vary-revision' );
2658                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2659                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2660                                 break;
2661                         case 'revisionmonth':
2662                                 # Let the edit saving system know we should parse the page
2663                                 # *after* a revision ID has been assigned. This is for null edits.
2664                                 $this->mOutput->setFlag( 'vary-revision' );
2665                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2666                                 $value = substr( $this->getRevisionTimestamp(), 4, 2 );
2667                                 break;
2668                         case 'revisionmonth1':
2669                                 # Let the edit saving system know we should parse the page
2670                                 # *after* a revision ID has been assigned. This is for null edits.
2671                                 $this->mOutput->setFlag( 'vary-revision' );
2672                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH1}} used, setting vary-revision...\n" );
2673                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2674                                 break;
2675                         case 'revisionyear':
2676                                 # Let the edit saving system know we should parse the page
2677                                 # *after* a revision ID has been assigned. This is for null edits.
2678                                 $this->mOutput->setFlag( 'vary-revision' );
2679                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2680                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2681                                 break;
2682                         case 'revisiontimestamp':
2683                                 # Let the edit saving system know we should parse the page
2684                                 # *after* a revision ID has been assigned. This is for null edits.
2685                                 $this->mOutput->setFlag( 'vary-revision' );
2686                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2687                                 $value = $this->getRevisionTimestamp();
2688                                 break;
2689                         case 'revisionuser':
2690                                 # Let the edit saving system know we should parse the page
2691                                 # *after* a revision ID has been assigned. This is for null edits.
2692                                 $this->mOutput->setFlag( 'vary-revision' );
2693                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2694                                 $value = $this->getRevisionUser();
2695                                 break;
2696                         case 'namespace':
2697                                 $value = str_replace( '_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2698                                 break;
2699                         case 'namespacee':
2700                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2701                                 break;
2702                         case 'talkspace':
2703                                 $value = $this->mTitle->canTalk() ? str_replace( '_',' ',$this->mTitle->getTalkNsText() ) : '';
2704                                 break;
2705                         case 'talkspacee':
2706                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2707                                 break;
2708                         case 'subjectspace':
2709                                 $value = $this->mTitle->getSubjectNsText();
2710                                 break;
2711                         case 'subjectspacee':
2712                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2713                                 break;
2714                         case 'currentdayname':
2715                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2716                                 break;
2717                         case 'currentyear':
2718                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2719                                 break;
2720                         case 'currenttime':
2721                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2722                                 break;
2723                         case 'currenthour':
2724                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2725                                 break;
2726                         case 'currentweek':
2727                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2728                                 # int to remove the padding
2729                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2730                                 break;
2731                         case 'currentdow':
2732                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2733                                 break;
2734                         case 'localdayname':
2735                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2736                                 break;
2737                         case 'localyear':
2738                                 $value = $wgContLang->formatNum( $localYear, true );
2739                                 break;
2740                         case 'localtime':
2741                                 $value = $wgContLang->time( $localTimestamp, false, false );
2742                                 break;
2743                         case 'localhour':
2744                                 $value = $wgContLang->formatNum( $localHour, true );
2745                                 break;
2746                         case 'localweek':
2747                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2748                                 # int to remove the padding
2749                                 $value = $wgContLang->formatNum( (int)$localWeek );
2750                                 break;
2751                         case 'localdow':
2752                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2753                                 break;
2754                         case 'numberofarticles':
2755                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2756                                 break;
2757                         case 'numberoffiles':
2758                                 $value = $wgContLang->formatNum( SiteStats::images() );
2759                                 break;
2760                         case 'numberofusers':
2761                                 $value = $wgContLang->formatNum( SiteStats::users() );
2762                                 break;
2763                         case 'numberofactiveusers':
2764                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2765                                 break;
2766                         case 'numberofpages':
2767                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2768                                 break;
2769                         case 'numberofadmins':
2770                                 $value = $wgContLang->formatNum( SiteStats::numberingroup( 'sysop' ) );
2771                                 break;
2772                         case 'numberofedits':
2773                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2774                                 break;
2775                         case 'numberofviews':
2776                                 $value = $wgContLang->formatNum( SiteStats::views() );
2777                                 break;
2778                         case 'currenttimestamp':
2779                                 $value = wfTimestamp( TS_MW, $ts );
2780                                 break;
2781                         case 'localtimestamp':
2782                                 $value = $localTimestamp;
2783                                 break;
2784                         case 'currentversion':
2785                                 $value = SpecialVersion::getVersion();
2786                                 break;
2787                         case 'articlepath':
2788                                 return $wgArticlePath;
2789                         case 'sitename':
2790                                 return $wgSitename;
2791                         case 'server':
2792                                 return $wgServer;
2793                         case 'servername':
2794                                 wfSuppressWarnings(); # May give an E_WARNING in PHP < 5.3.3
2795                                 $serverName = parse_url( $wgServer, PHP_URL_HOST );
2796                                 wfRestoreWarnings();
2797                                 return $serverName ? $serverName : $wgServer;
2798                         case 'scriptpath':
2799                                 return $wgScriptPath;
2800                         case 'stylepath':
2801                                 return $wgStylePath;
2802                         case 'directionmark':
2803                                 return $wgContLang->getDirMark();
2804                         case 'contentlanguage':
2805                                 global $wgLanguageCode;
2806                                 return $wgLanguageCode;
2807                         default:
2808                                 $ret = null;
2809                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) ) {
2810                                         return $ret;
2811                                 } else {
2812                                         return null;
2813                                 }
2814                 }
2815
2816                 if ( $index )
2817                         $this->mVarCache[$index] = $value;
2818
2819                 return $value;
2820         }
2821
2822         /**
2823          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2824          *
2825          * @private
2826          */
2827         function initialiseVariables() {
2828                 wfProfileIn( __METHOD__ );
2829                 $variableIDs = MagicWord::getVariableIDs();
2830                 $substIDs = MagicWord::getSubstIDs();
2831
2832                 $this->mVariables = new MagicWordArray( $variableIDs );
2833                 $this->mSubstWords = new MagicWordArray( $substIDs );
2834                 wfProfileOut( __METHOD__ );
2835         }
2836
2837         /**
2838          * Preprocess some wikitext and return the document tree.
2839          * This is the ghost of replace_variables().
2840          *
2841          * @param $text String: The text to parse
2842          * @param $flags Integer: bitwise combination of:
2843          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2844          *                                     included. Default is to assume a direct page view.
2845          *
2846          * The generated DOM tree must depend only on the input text and the flags.
2847          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2848          *
2849          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2850          * change in the DOM tree for a given text, must be passed through the section identifier
2851          * in the section edit link and thus back to extractSections().
2852          *
2853          * The output of this function is currently only cached in process memory, but a persistent
2854          * cache may be implemented at a later date which takes further advantage of these strict
2855          * dependency requirements.
2856          *
2857          * @private
2858          */
2859         function preprocessToDom( $text, $flags = 0 ) {
2860                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2861                 return $dom;
2862         }
2863
2864         /**
2865          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2866          */
2867         public static function splitWhitespace( $s ) {
2868                 $ltrimmed = ltrim( $s );
2869                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2870                 $trimmed = rtrim( $ltrimmed );
2871                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2872                 if ( $diff > 0 ) {
2873                         $w2 = substr( $ltrimmed, -$diff );
2874                 } else {
2875                         $w2 = '';
2876                 }
2877                 return array( $w1, $trimmed, $w2 );
2878         }
2879
2880         /**
2881          * Replace magic variables, templates, and template arguments
2882          * with the appropriate text. Templates are substituted recursively,
2883          * taking care to avoid infinite loops.
2884          *
2885          * Note that the substitution depends on value of $mOutputType:
2886          *  self::OT_WIKI: only {{subst:}} templates
2887          *  self::OT_PREPROCESS: templates but not extension tags
2888          *  self::OT_HTML: all templates and extension tags
2889          *
2890          * @param $text String: the text to transform
2891          * @param $frame PPFrame Object describing the arguments passed to the template.
2892          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2893          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2894          * @param $argsOnly Boolean: only do argument (triple-brace) expansion, not double-brace expansion
2895          * @private
2896          */
2897         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2898                 # Is there any text? Also, Prevent too big inclusions!
2899                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2900                         return $text;
2901                 }
2902                 wfProfileIn( __METHOD__ );
2903
2904                 if ( $frame === false ) {
2905                         $frame = $this->getPreprocessor()->newFrame();
2906                 } elseif ( !( $frame instanceof PPFrame ) ) {
2907                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2908                         $frame = $this->getPreprocessor()->newCustomFrame( $frame );
2909                 }
2910
2911                 $dom = $this->preprocessToDom( $text );
2912                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2913                 $text = $frame->expand( $dom, $flags );
2914
2915                 wfProfileOut( __METHOD__ );
2916                 return $text;
2917         }
2918
2919         # Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2920         static function createAssocArgs( $args ) {
2921                 $assocArgs = array();
2922                 $index = 1;
2923                 foreach ( $args as $arg ) {
2924                         $eqpos = strpos( $arg, '=' );
2925                         if ( $eqpos === false ) {
2926                                 $assocArgs[$index++] = $arg;
2927                         } else {
2928                                 $name = trim( substr( $arg, 0, $eqpos ) );
2929                                 $value = trim( substr( $arg, $eqpos+1 ) );
2930                                 if ( $value === false ) {
2931                                         $value = '';
2932                                 }
2933                                 if ( $name !== false ) {
2934                                         $assocArgs[$name] = $value;
2935                                 }
2936                         }
2937                 }
2938
2939                 return $assocArgs;
2940         }
2941
2942         /**
2943          * Warn the user when a parser limitation is reached
2944          * Will warn at most once the user per limitation type
2945          *
2946          * @param $limitationType String: should be one of:
2947          *   'expensive-parserfunction' (corresponding messages:
2948          *       'expensive-parserfunction-warning',
2949          *       'expensive-parserfunction-category')
2950          *   'post-expand-template-argument' (corresponding messages:
2951          *       'post-expand-template-argument-warning',
2952          *       'post-expand-template-argument-category')
2953          *   'post-expand-template-inclusion' (corresponding messages:
2954          *       'post-expand-template-inclusion-warning',
2955          *       'post-expand-template-inclusion-category')
2956          * @param $current Current value
2957          * @param $max Maximum allowed, when an explicit limit has been
2958          *       exceeded, provide the values (optional)
2959          */
2960         function limitationWarn( $limitationType, $current=null, $max=null) {
2961                 # does no harm if $current and $max are present but are unnecessary for the message
2962                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2963                 $this->mOutput->addWarning( $warning );
2964                 $this->addTrackingCategory( "$limitationType-category" );
2965         }
2966
2967         /**
2968          * Return the text of a template, after recursively
2969          * replacing any variables or templates within the template.
2970          *
2971          * @param $piece Array: the parts of the template
2972          *  $piece['title']: the title, i.e. the part before the |
2973          *  $piece['parts']: the parameter array
2974          *  $piece['lineStart']: whether the brace was at the start of a line
2975          * @param $frame PPFrame The current frame, contains template arguments
2976          * @return String: the text of the template
2977          * @private
2978          */
2979         function braceSubstitution( $piece, $frame ) {
2980                 global $wgContLang, $wgNonincludableNamespaces;
2981                 wfProfileIn( __METHOD__ );
2982                 wfProfileIn( __METHOD__.'-setup' );
2983
2984                 # Flags
2985                 $found = false;             # $text has been filled
2986                 $nowiki = false;            # wiki markup in $text should be escaped
2987                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2988                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2989                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2990                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2991
2992                 # Title object, where $text came from
2993                 $title = null;
2994
2995                 # $part1 is the bit before the first |, and must contain only title characters.
2996                 # Various prefixes will be stripped from it later.
2997                 $titleWithSpaces = $frame->expand( $piece['title'] );
2998                 $part1 = trim( $titleWithSpaces );
2999                 $titleText = false;
3000
3001                 # Original title text preserved for various purposes
3002                 $originalTitle = $part1;
3003
3004                 # $args is a list of argument nodes, starting from index 0, not including $part1
3005                 # *** FIXME if piece['parts'] is null then the call to getLength() below won't work b/c this $args isn't an object
3006                 $args = ( null == $piece['parts'] ) ? array() : $piece['parts'];
3007                 wfProfileOut( __METHOD__.'-setup' );
3008
3009                 # SUBST
3010                 wfProfileIn( __METHOD__.'-modifiers' );
3011                 if ( !$found ) {
3012
3013                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
3014
3015                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
3016                         # Decide whether to expand template or keep wikitext as-is.
3017                         if ( $this->ot['wiki'] ) {
3018                                 if ( $substMatch === false ) {
3019                                         $literal = true;  # literal when in PST with no prefix
3020                                 } else {
3021                                         $literal = false; # expand when in PST with subst: or safesubst:
3022                                 }
3023                         } else {
3024                                 if ( $substMatch == 'subst' ) {
3025                                         $literal = true;  # literal when not in PST with plain subst:
3026                                 } else {
3027                                         $literal = false; # expand when not in PST with safesubst: or no prefix
3028                                 }
3029                         }
3030                         if ( $literal ) {
3031                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3032                                 $isLocalObj = true;
3033                                 $found = true;
3034                         }
3035                 }
3036
3037                 # Variables
3038                 if ( !$found && $args->getLength() == 0 ) {
3039                         $id = $this->mVariables->matchStartToEnd( $part1 );
3040                         if ( $id !== false ) {
3041                                 $text = $this->getVariableValue( $id, $frame );
3042                                 if ( MagicWord::getCacheTTL( $id ) > -1 ) {
3043                                         $this->mOutput->updateCacheExpiry( MagicWord::getCacheTTL( $id ) );
3044                                 }
3045                                 $found = true;
3046                         }
3047                 }
3048
3049                 # MSG, MSGNW and RAW
3050                 if ( !$found ) {
3051                         # Check for MSGNW:
3052                         $mwMsgnw = MagicWord::get( 'msgnw' );
3053                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3054                                 $nowiki = true;
3055                         } else {
3056                                 # Remove obsolete MSG:
3057                                 $mwMsg = MagicWord::get( 'msg' );
3058                                 $mwMsg->matchStartAndRemove( $part1 );
3059                         }
3060
3061                         # Check for RAW:
3062                         $mwRaw = MagicWord::get( 'raw' );
3063                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3064                                 $forceRawInterwiki = true;
3065                         }
3066                 }
3067                 wfProfileOut( __METHOD__.'-modifiers' );
3068
3069                 # Parser functions
3070                 if ( !$found ) {
3071                         wfProfileIn( __METHOD__ . '-pfunc' );
3072
3073                         $colonPos = strpos( $part1, ':' );
3074                         if ( $colonPos !== false ) {
3075                                 # Case sensitive functions
3076                                 $function = substr( $part1, 0, $colonPos );
3077                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3078                                         $function = $this->mFunctionSynonyms[1][$function];
3079                                 } else {
3080                                         # Case insensitive functions
3081                                         $function = $wgContLang->lc( $function );
3082                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3083                                                 $function = $this->mFunctionSynonyms[0][$function];
3084                                         } else {
3085                                                 $function = false;
3086                                         }
3087                                 }
3088                                 if ( $function ) {
3089                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
3090                                         $initialArgs = array( &$this );
3091                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
3092                                         if ( $flags & SFH_OBJECT_ARGS ) {
3093                                                 # Add a frame parameter, and pass the arguments as an array
3094                                                 $allArgs = $initialArgs;
3095                                                 $allArgs[] = $frame;
3096                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
3097                                                         $funcArgs[] = $args->item( $i );
3098                                                 }
3099                                                 $allArgs[] = $funcArgs;
3100                                         } else {
3101                                                 # Convert arguments to plain text
3102                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
3103                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
3104                                                 }
3105                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
3106                                         }
3107
3108                                         # Workaround for PHP bug 35229 and similar
3109                                         if ( !is_callable( $callback ) ) {
3110                                                 wfProfileOut( __METHOD__ . '-pfunc' );
3111                                                 wfProfileOut( __METHOD__ );
3112                                                 throw new MWException( "Tag hook for $function is not callable\n" );
3113                                         }
3114                                         $result = call_user_func_array( $callback, $allArgs );
3115                                         $found = true;
3116                                         $noparse = true;
3117                                         $preprocessFlags = 0;
3118
3119                                         if ( is_array( $result ) ) {
3120                                                 if ( isset( $result[0] ) ) {
3121                                                         $text = $result[0];
3122                                                         unset( $result[0] );
3123                                                 }
3124
3125                                                 # Extract flags into the local scope
3126                                                 # This allows callers to set flags such as nowiki, found, etc.
3127                                                 extract( $result );
3128                                         } else {
3129                                                 $text = $result;
3130                                         }
3131                                         if ( !$noparse ) {
3132                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
3133                                                 $isChildObj = true;
3134                                         }
3135                                 }
3136                         }
3137                         wfProfileOut( __METHOD__ . '-pfunc' );
3138                 }
3139
3140                 # Finish mangling title and then check for loops.
3141                 # Set $title to a Title object and $titleText to the PDBK
3142                 if ( !$found ) {
3143                         $ns = NS_TEMPLATE;
3144                         # Split the title into page and subpage
3145                         $subpage = '';
3146                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3147                         if ( $subpage !== '' ) {
3148                                 $ns = $this->mTitle->getNamespace();
3149                         }
3150                         $title = Title::newFromText( $part1, $ns );
3151                         if ( $title ) {
3152                                 $titleText = $title->getPrefixedText();
3153                                 # Check for language variants if the template is not found
3154                                 if ( $wgContLang->hasVariants() && $title->getArticleID() == 0 ) {
3155                                         $wgContLang->findVariantLink( $part1, $title, true );
3156                                 }
3157                                 # Do recursion depth check
3158                                 $limit = $this->mOptions->getMaxTemplateDepth();
3159                                 if ( $frame->depth >= $limit ) {
3160                                         $found = true;
3161                                         $text = '<span class="error">'
3162                                                 . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit )
3163                                                 . '</span>';
3164                                 }
3165                         }
3166                 }
3167
3168                 # Load from database
3169                 if ( !$found && $title ) {
3170                         wfProfileIn( __METHOD__ . '-loadtpl' );
3171                         if ( !$title->isExternal() ) {
3172                                 if ( $title->getNamespace() == NS_SPECIAL
3173                                         && $this->mOptions->getAllowSpecialInclusion()
3174                                         && $this->ot['html'] )
3175                                 {
3176                                         $text = SpecialPage::capturePath( $title );
3177                                         if ( is_string( $text ) ) {
3178                                                 $found = true;
3179                                                 $isHTML = true;
3180                                                 $this->disableCache();
3181                                         }
3182                                 } elseif ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3183                                         $found = false; # access denied
3184                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
3185                                 } else {
3186                                         list( $text, $title ) = $this->getTemplateDom( $title );
3187                                         if ( $text !== false ) {
3188                                                 $found = true;
3189                                                 $isChildObj = true;
3190                                         }
3191                                 }
3192
3193                                 # If the title is valid but undisplayable, make a link to it
3194                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3195                                         $text = "[[:$titleText]]";
3196                                         $found = true;
3197                                 }
3198                         } elseif ( $title->isTrans() ) {
3199                                 # Interwiki transclusion
3200                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3201                                         $text = $this->interwikiTransclude( $title, 'render' );
3202                                         $isHTML = true;
3203                                 } else {
3204                                         $text = $this->interwikiTransclude( $title, 'raw' );
3205                                         # Preprocess it like a template
3206                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3207                                         $isChildObj = true;
3208                                 }
3209                                 $found = true;
3210                         }
3211
3212                         # Do infinite loop check
3213                         # This has to be done after redirect resolution to avoid infinite loops via redirects
3214                         if ( !$frame->loopCheck( $title ) ) {
3215                                 $found = true;
3216                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
3217                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
3218                         }
3219                         wfProfileOut( __METHOD__ . '-loadtpl' );
3220                 }
3221
3222                 # If we haven't found text to substitute by now, we're done
3223                 # Recover the source wikitext and return it
3224                 if ( !$found ) {
3225                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3226                         wfProfileOut( __METHOD__ );
3227                         return array( 'object' => $text );
3228                 }
3229
3230                 # Expand DOM-style return values in a child frame
3231                 if ( $isChildObj ) {
3232                         # Clean up argument array
3233                         $newFrame = $frame->newChild( $args, $title );
3234
3235                         if ( $nowiki ) {
3236                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3237                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3238                                 # Expansion is eligible for the empty-frame cache
3239                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3240                                         $text = $this->mTplExpandCache[$titleText];
3241                                 } else {
3242                                         $text = $newFrame->expand( $text );
3243                                         $this->mTplExpandCache[$titleText] = $text;
3244                                 }
3245                         } else {
3246                                 # Uncached expansion
3247                                 $text = $newFrame->expand( $text );
3248                         }
3249                 }
3250                 if ( $isLocalObj && $nowiki ) {
3251                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3252                         $isLocalObj = false;
3253                 }
3254
3255                 # Replace raw HTML by a placeholder
3256                 # Add a blank line preceding, to prevent it from mucking up
3257                 # immediately preceding headings
3258                 if ( $isHTML ) {
3259                         $text = "\n\n" . $this->insertStripItem( $text );
3260                 } elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3261                         # Escape nowiki-style return values
3262                         $text = wfEscapeWikiText( $text );
3263                 } elseif ( is_string( $text )
3264                         && !$piece['lineStart']
3265                         && preg_match( '/^{\\|/', $text ) )
3266                 {
3267                         # Bug 529: if the template begins with a table, it should be treated as
3268                         # beginning a new line.  This previously handled other block-level elements
3269                         # such as #, :, etc, but these have many false-positives (bug 12974).
3270                         $text = "\n" . $text;
3271                 }
3272
3273                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3274                         # Error, oversize inclusion
3275                         if ( $titleText !== false ) {
3276                                 # Make a working, properly escaped link if possible (bug 23588)
3277                                 $text = "[[:$titleText]]";
3278                         } else {
3279                                 # This will probably not be a working link, but at least it may
3280                                 # provide some hint of where the problem is
3281                                 preg_replace( '/^:/', '', $originalTitle );
3282                                 $text = "[[:$originalTitle]]";
3283                         }
3284                         $text .= $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3285                         $this->limitationWarn( 'post-expand-template-inclusion' );
3286                 }
3287
3288                 if ( $isLocalObj ) {
3289                         $ret = array( 'object' => $text );
3290                 } else {
3291                         $ret = array( 'text' => $text );
3292                 }
3293
3294                 wfProfileOut( __METHOD__ );
3295                 return $ret;
3296         }
3297
3298         /**
3299          * Get the semi-parsed DOM representation of a template with a given title,
3300          * and its redirect destination title. Cached.
3301          */
3302         function getTemplateDom( $title ) {
3303                 $cacheTitle = $title;
3304                 $titleText = $title->getPrefixedDBkey();
3305
3306                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3307                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3308                         $title = Title::makeTitle( $ns, $dbk );
3309                         $titleText = $title->getPrefixedDBkey();
3310                 }
3311                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3312                         return array( $this->mTplDomCache[$titleText], $title );
3313                 }
3314
3315                 # Cache miss, go to the database
3316                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3317
3318                 if ( $text === false ) {
3319                         $this->mTplDomCache[$titleText] = false;
3320                         return array( false, $title );
3321                 }
3322
3323                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3324                 $this->mTplDomCache[ $titleText ] = $dom;
3325
3326                 if ( !$title->equals( $cacheTitle ) ) {
3327                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3328                                 array( $title->getNamespace(), $title->getDBkey() );
3329                 }
3330
3331                 return array( $dom, $title );
3332         }
3333
3334         /**
3335          * Fetch the unparsed text of a template and register a reference to it.
3336          */
3337         function fetchTemplateAndTitle( $title ) {
3338                 $templateCb = $this->mOptions->getTemplateCallback(); # Defaults to Parser::statelessFetchTemplate()
3339                 $stuff = call_user_func( $templateCb, $title, $this );
3340                 $text = $stuff['text'];
3341                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3342                 if ( isset( $stuff['deps'] ) ) {
3343                         foreach ( $stuff['deps'] as $dep ) {
3344                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3345                         }
3346                 }
3347                 return array( $text, $finalTitle );
3348         }
3349
3350         function fetchTemplate( $title ) {
3351                 $rv = $this->fetchTemplateAndTitle( $title );
3352                 return $rv[0];
3353         }
3354
3355         /**
3356          * Static function to get a template
3357          * Can be overridden via ParserOptions::setTemplateCallback().
3358          */
3359         static function statelessFetchTemplate( $title, $parser=false ) {
3360                 $text = $skip = false;
3361                 $finalTitle = $title;
3362                 $deps = array();
3363
3364                 # Loop to fetch the article, with up to 1 redirect
3365                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3366                         # Give extensions a chance to select the revision instead
3367                         $id = false; # Assume current
3368                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3369
3370                         if ( $skip ) {
3371                                 $text = false;
3372                                 $deps[] = array(
3373                                         'title' => $title,
3374                                         'page_id' => $title->getArticleID(),
3375                                         'rev_id' => null );
3376                                 break;
3377                         }
3378                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3379                         $rev_id = $rev ? $rev->getId() : 0;
3380                         # If there is no current revision, there is no page
3381                         if ( $id === false && !$rev ) {
3382                                 $linkCache = LinkCache::singleton();
3383                                 $linkCache->addBadLinkObj( $title );
3384                         }
3385
3386                         $deps[] = array(
3387                                 'title' => $title,
3388                                 'page_id' => $title->getArticleID(),
3389                                 'rev_id' => $rev_id );
3390
3391                         if ( $rev ) {
3392                                 $text = $rev->getText();
3393                         } elseif ( $title->getNamespace() == NS_MEDIAWIKI ) {
3394                                 global $wgContLang;
3395                                 $message = wfMessage( $wgContLang->lcfirst( $title->getText() ) )->inContentLanguage();
3396                                 if ( !$message->exists() ) {
3397                                         $text = false;
3398                                         break;
3399                                 }
3400                                 $text = $message->plain();
3401                         } else {
3402                                 break;
3403                         }
3404                         if ( $text === false ) {
3405                                 break;
3406                         }
3407                         # Redirect?
3408                         $finalTitle = $title;
3409                         $title = Title::newFromRedirect( $text );
3410                 }
3411                 return array(
3412                         'text' => $text,
3413                         'finalTitle' => $finalTitle,
3414                         'deps' => $deps );
3415         }
3416
3417         /**
3418          * Transclude an interwiki link.
3419          */
3420         function interwikiTransclude( $title, $action ) {
3421                 global $wgEnableScaryTranscluding;
3422
3423                 if ( !$wgEnableScaryTranscluding ) {
3424                         return wfMsgForContent('scarytranscludedisabled');
3425                 }
3426
3427                 $url = $title->getFullUrl( "action=$action" );
3428
3429                 if ( strlen( $url ) > 255 ) {
3430                         return wfMsgForContent( 'scarytranscludetoolong' );
3431                 }
3432                 return $this->fetchScaryTemplateMaybeFromCache( $url );
3433         }
3434
3435         function fetchScaryTemplateMaybeFromCache( $url ) {
3436                 global $wgTranscludeCacheExpiry;
3437                 $dbr = wfGetDB( DB_SLAVE );
3438                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3439                 $obj = $dbr->selectRow( 'transcache', array('tc_time', 'tc_contents' ),
3440                                 array( 'tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3441                 if ( $obj ) {
3442                         return $obj->tc_contents;
3443                 }
3444
3445                 $text = Http::get( $url );
3446                 if ( !$text ) {
3447                         return wfMsgForContent( 'scarytranscludefailed', $url );
3448                 }
3449
3450                 $dbw = wfGetDB( DB_MASTER );
3451                 $dbw->replace( 'transcache', array('tc_url'), array(
3452                         'tc_url' => $url,
3453                         'tc_time' => $dbw->timestamp( time() ),
3454                         'tc_contents' => $text)
3455                 );
3456                 return $text;
3457         }
3458
3459
3460         /**
3461          * Triple brace replacement -- used for template arguments
3462          * @private
3463          */
3464         function argSubstitution( $piece, $frame ) {
3465                 wfProfileIn( __METHOD__ );
3466
3467                 $error = false;
3468                 $parts = $piece['parts'];
3469                 $nameWithSpaces = $frame->expand( $piece['title'] );
3470                 $argName = trim( $nameWithSpaces );
3471                 $object = false;
3472                 $text = $frame->getArgument( $argName );
3473                 if (  $text === false && $parts->getLength() > 0
3474                   && (
3475                         $this->ot['html']
3476                         || $this->ot['pre']
3477                         || ( $this->ot['wiki'] && $frame->isTemplate() )
3478                   )
3479                 ) {
3480                         # No match in frame, use the supplied default
3481                         $object = $parts->item( 0 )->getChildren();
3482                 }
3483                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3484                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3485                         $this->limitationWarn( 'post-expand-template-argument' );
3486                 }
3487
3488                 if ( $text === false && $object === false ) {
3489                         # No match anywhere
3490                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3491                 }
3492                 if ( $error !== false ) {
3493                         $text .= $error;
3494                 }
3495                 if ( $object !== false ) {
3496                         $ret = array( 'object' => $object );
3497                 } else {
3498                         $ret = array( 'text' => $text );
3499                 }
3500
3501                 wfProfileOut( __METHOD__ );
3502                 return $ret;
3503         }
3504
3505         /**
3506          * Return the text to be used for a given extension tag.
3507          * This is the ghost of strip().
3508          *
3509          * @param $params Associative array of parameters:
3510          *     name       PPNode for the tag name
3511          *     attr       PPNode for unparsed text where tag attributes are thought to be
3512          *     attributes Optional associative array of parsed attributes
3513          *     inner      Contents of extension element
3514          *     noClose    Original text did not have a close tag
3515          * @param $frame PPFrame
3516          */
3517         function extensionSubstitution( $params, $frame ) {
3518                 $name = $frame->expand( $params['name'] );
3519                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3520                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3521                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf( '%08X', $this->mMarkerIndex++ ) . self::MARKER_SUFFIX;
3522
3523                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3524                         ( $this->ot['html'] || $this->ot['pre'] );
3525                 if ( $isFunctionTag ) {
3526                         $markerType = 'none';
3527                 } else {
3528                         $markerType = 'general';
3529                 }
3530                 if ( $this->ot['html'] || $isFunctionTag ) {
3531                         $name = strtolower( $name );
3532                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3533                         if ( isset( $params['attributes'] ) ) {
3534                                 $attributes = $attributes + $params['attributes'];
3535                         }
3536
3537                         if ( isset( $this->mTagHooks[$name] ) ) {
3538                                 # Workaround for PHP bug 35229 and similar
3539                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3540                                         throw new MWException( "Tag hook for $name is not callable\n" );
3541                                 }
3542                                 $output = call_user_func_array( $this->mTagHooks[$name],
3543                                         array( $content, $attributes, $this, $frame ) );
3544                         } elseif ( isset( $this->mFunctionTagHooks[$name] ) ) {
3545                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3546                                 if ( !is_callable( $callback ) ) {
3547                                         throw new MWException( "Tag hook for $name is not callable\n" );
3548                                 }
3549
3550                                 $output = call_user_func_array( $callback, array( &$this, $frame, $content, $attributes ) );
3551                         } else {
3552                                 $output = '<span class="error">Invalid tag extension name: ' .
3553                                         htmlspecialchars( $name ) . '</span>';
3554                         }
3555
3556                         if ( is_array( $output ) ) {
3557                                 # Extract flags to local scope (to override $markerType)
3558                                 $flags = $output;
3559                                 $output = $flags[0];
3560                                 unset( $flags[0] );
3561                                 extract( $flags );
3562                         }
3563                 } else {
3564                         if ( is_null( $attrText ) ) {
3565                                 $attrText = '';
3566                         }
3567                         if ( isset( $params['attributes'] ) ) {
3568                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3569                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3570                                                 htmlspecialchars( $attrValue ) . '"';
3571                                 }
3572                         }
3573                         if ( $content === null ) {
3574                                 $output = "<$name$attrText/>";
3575                         } else {
3576                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3577                                 $output = "<$name$attrText>$content$close";
3578                         }
3579                 }
3580
3581                 if ( $markerType === 'none' ) {
3582                         return $output;
3583                 } elseif ( $markerType === 'nowiki' ) {
3584                         $this->mStripState->nowiki->setPair( $marker, $output );
3585                 } elseif ( $markerType === 'general' ) {
3586                         $this->mStripState->general->setPair( $marker, $output );
3587                 } else {
3588                         throw new MWException( __METHOD__.': invalid marker type' );
3589                 }
3590                 return $marker;
3591         }
3592
3593         /**
3594          * Increment an include size counter
3595          *
3596          * @param $type String: the type of expansion
3597          * @param $size Integer: the size of the text
3598          * @return Boolean: false if this inclusion would take it over the maximum, true otherwise
3599          */
3600         function incrementIncludeSize( $type, $size ) {
3601                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3602                         return false;
3603                 } else {
3604                         $this->mIncludeSizes[$type] += $size;
3605                         return true;
3606                 }
3607         }
3608
3609         /**
3610          * Increment the expensive function count
3611          *
3612          * @return Boolean: false if the limit has been exceeded
3613          */
3614         function incrementExpensiveFunctionCount() {
3615                 global $wgExpensiveParserFunctionLimit;
3616                 $this->mExpensiveFunctionCount++;
3617                 if ( $this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit ) {
3618                         return true;
3619                 }
3620                 return false;
3621         }
3622
3623         /**
3624          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3625          * Fills $this->mDoubleUnderscores, returns the modified text
3626          */
3627         function doDoubleUnderscore( $text ) {
3628                 wfProfileIn( __METHOD__ );
3629
3630                 # The position of __TOC__ needs to be recorded
3631                 $mw = MagicWord::get( 'toc' );
3632                 if ( $mw->match( $text ) ) {
3633                         $this->mShowToc = true;
3634                         $this->mForceTocPosition = true;
3635
3636                         # Set a placeholder. At the end we'll fill it in with the TOC.
3637                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3638
3639                         # Only keep the first one.
3640                         $text = $mw->replace( '', $text );
3641                 }
3642
3643                 # Now match and remove the rest of them
3644                 $mwa = MagicWord::getDoubleUnderscoreArray();
3645                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3646
3647                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3648                         $this->mOutput->mNoGallery = true;
3649                 }
3650                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3651                         $this->mShowToc = false;
3652                 }
3653                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3654                         $this->addTrackingCategory( 'hidden-category-category' );
3655                 }
3656                 # (bug 8068) Allow control over whether robots index a page.
3657                 #
3658                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3659                 # is not desirable, the last one on the page should win.
3660                 if ( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3661                         $this->mOutput->setIndexPolicy( 'noindex' );
3662                         $this->addTrackingCategory( 'noindex-category' );
3663                 }
3664                 if ( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ) {
3665                         $this->mOutput->setIndexPolicy( 'index' );
3666                         $this->addTrackingCategory( 'index-category' );
3667                 }
3668
3669                 # Cache all double underscores in the database
3670                 foreach ( $this->mDoubleUnderscores as $key => $val ) {
3671                         $this->mOutput->setProperty( $key, '' );
3672                 }
3673
3674                 wfProfileOut( __METHOD__ );
3675                 return $text;
3676         }
3677
3678         /**
3679          * Add a tracking category, getting the title from a system message,
3680          * or print a debug message if the title is invalid.
3681          *
3682          * @param $msg String: message key
3683          * @return Boolean: whether the addition was successful
3684          */
3685         protected function addTrackingCategory( $msg ) {
3686                 $cat = wfMsgForContent( $msg );
3687
3688                 # Allow tracking categories to be disabled by setting them to "-"
3689                 if ( $cat === '-' ) {
3690                         return false;
3691                 }
3692
3693                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3694                 if ( $containerCategory ) {
3695                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3696                         return true;
3697                 } else {
3698                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3699                         return false;
3700                 }
3701         }
3702
3703         /**
3704          * This function accomplishes several tasks:
3705          * 1) Auto-number headings if that option is enabled
3706          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3707          * 3) Add a Table of contents on the top for users who have enabled the option
3708          * 4) Auto-anchor headings
3709          *
3710          * It loops through all headlines, collects the necessary data, then splits up the
3711          * string and re-inserts the newly formatted headlines.
3712          *
3713          * @param $text String
3714          * @param $origText String: original, untouched wikitext
3715          * @param $isMain Boolean
3716          * @private
3717          */
3718         function formatHeadings( $text, $origText, $isMain=true ) {
3719                 global $wgMaxTocLevel, $wgContLang, $wgHtml5, $wgExperimentalHtmlIds;
3720
3721                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3722
3723                 # Inhibit editsection links if requested in the page
3724                 if ( isset( $this->mDoubleUnderscores['noeditsection'] ) ) {
3725                         $showEditLink = 0;
3726                 } else {
3727                         $showEditLink = $this->mOptions->getEditSection();
3728                 }
3729                 if ( $showEditLink ) {
3730                         $this->mOutput->setEditSectionTokens( true );
3731                 }
3732
3733                 # Get all headlines for numbering them and adding funky stuff like [edit]
3734                 # links - this is for later, but we need the number of headlines right now
3735                 $matches = array();
3736                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3737
3738                 # if there are fewer than 4 headlines in the article, do not show TOC
3739                 # unless it's been explicitly enabled.
3740                 $enoughToc = $this->mShowToc &&
3741                         ( ( $numMatches >= 4 ) || $this->mForceTocPosition );
3742
3743                 # Allow user to stipulate that a page should have a "new section"
3744                 # link added via __NEWSECTIONLINK__
3745                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3746                         $this->mOutput->setNewSection( true );
3747                 }
3748
3749                 # Allow user to remove the "new section"
3750                 # link via __NONEWSECTIONLINK__
3751                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3752                         $this->mOutput->hideNewSection( true );
3753                 }
3754
3755                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3756                 # override above conditions and always show TOC above first header
3757                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3758                         $this->mShowToc = true;
3759                         $enoughToc = true;
3760                 }
3761
3762                 # We need this to perform operations on the HTML
3763                 $sk = $this->mOptions->getSkin( $this->mTitle );
3764
3765                 # headline counter
3766                 $headlineCount = 0;
3767                 $numVisible = 0;
3768
3769                 # Ugh .. the TOC should have neat indentation levels which can be
3770                 # passed to the skin functions. These are determined here
3771                 $toc = '';
3772                 $full = '';
3773                 $head = array();
3774                 $sublevelCount = array();
3775                 $levelCount = array();
3776                 $level = 0;
3777                 $prevlevel = 0;
3778                 $toclevel = 0;
3779                 $prevtoclevel = 0;
3780                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3781                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3782                 $oldType = $this->mOutputType;
3783                 $this->setOutputType( self::OT_WIKI );
3784                 $frame = $this->getPreprocessor()->newFrame();
3785                 $root = $this->preprocessToDom( $origText );
3786                 $node = $root->getFirstChild();
3787                 $byteOffset = 0;
3788                 $tocraw = array();
3789                 $refers = array();
3790
3791                 foreach ( $matches[3] as $headline ) {
3792                         $isTemplate = false;
3793                         $titleText = false;
3794                         $sectionIndex = false;
3795                         $numbering = '';
3796                         $markerMatches = array();
3797                         if ( preg_match("/^$markerRegex/", $headline, $markerMatches ) ) {
3798                                 $serial = $markerMatches[1];
3799                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3800                                 $isTemplate = ( $titleText != $baseTitleText );
3801                                 $headline = preg_replace( "/^$markerRegex/", "", $headline );
3802                         }
3803
3804                         if ( $toclevel ) {
3805                                 $prevlevel = $level;
3806                         }
3807                         $level = $matches[1][$headlineCount];
3808
3809                         if ( $level > $prevlevel ) {
3810                                 # Increase TOC level
3811                                 $toclevel++;
3812                                 $sublevelCount[$toclevel] = 0;
3813                                 if ( $toclevel<$wgMaxTocLevel ) {
3814                                         $prevtoclevel = $toclevel;
3815                                         $toc .= $sk->tocIndent();
3816                                         $numVisible++;
3817                                 }
3818                         } elseif ( $level < $prevlevel && $toclevel > 1 ) {
3819                                 # Decrease TOC level, find level to jump to
3820
3821                                 for ( $i = $toclevel; $i > 0; $i-- ) {
3822                                         if ( $levelCount[$i] == $level ) {
3823                                                 # Found last matching level
3824                                                 $toclevel = $i;
3825                                                 break;
3826                                         } elseif ( $levelCount[$i] < $level ) {
3827                                                 # Found first matching level below current level
3828                                                 $toclevel = $i + 1;
3829                                                 break;
3830                                         }
3831                                 }
3832                                 if ( $i == 0 ) {
3833                                         $toclevel = 1;
3834                                 }
3835                                 if ( $toclevel<$wgMaxTocLevel ) {
3836                                         if ( $prevtoclevel < $wgMaxTocLevel ) {
3837                                                 # Unindent only if the previous toc level was shown :p
3838                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3839                                                 $prevtoclevel = $toclevel;
3840                                         } else {
3841                                                 $toc .= $sk->tocLineEnd();
3842                                         }
3843                                 }
3844                         } else {
3845                                 # No change in level, end TOC line
3846                                 if ( $toclevel<$wgMaxTocLevel ) {
3847                                         $toc .= $sk->tocLineEnd();
3848                                 }
3849                         }
3850
3851                         $levelCount[$toclevel] = $level;
3852
3853                         # count number of headlines for each level
3854                         @$sublevelCount[$toclevel]++;
3855                         $dot = 0;
3856                         for( $i = 1; $i <= $toclevel; $i++ ) {
3857                                 if ( !empty( $sublevelCount[$i] ) ) {
3858                                         if ( $dot ) {
3859                                                 $numbering .= '.';
3860                                         }
3861                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3862                                         $dot = 1;
3863                                 }
3864                         }
3865
3866                         # The safe header is a version of the header text safe to use for links
3867                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3868                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3869
3870                         # Remove link placeholders by the link text.
3871                         #     <!--LINK number-->
3872                         # turns into
3873                         #     link text with suffix
3874                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3875
3876                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3877                         $tocline = preg_replace(
3878                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3879                                 array( '',                          '<$1>' ),
3880                                 $safeHeadline
3881                         );
3882                         $tocline = trim( $tocline );
3883
3884                         # For the anchor, strip out HTML-y stuff period
3885                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3886                         $safeHeadline = Sanitizer::normalizeSectionNameWhitespace( $safeHeadline );
3887
3888                         # Save headline for section edit hint before it's escaped
3889                         $headlineHint = $safeHeadline;
3890
3891                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
3892                                 # For reverse compatibility, provide an id that's
3893                                 # HTML4-compatible, like we used to.
3894                                 #
3895                                 # It may be worth noting, academically, that it's possible for
3896                                 # the legacy anchor to conflict with a non-legacy headline
3897                                 # anchor on the page.  In this case likely the "correct" thing
3898                                 # would be to either drop the legacy anchors or make sure
3899                                 # they're numbered first.  However, this would require people
3900                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3901                                 # manually, so let's not bother worrying about it.
3902                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3903                                         array( 'noninitial', 'legacy' ) );
3904                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3905
3906                                 if ( $legacyHeadline == $safeHeadline ) {
3907                                         # No reason to have both (in fact, we can't)
3908                                         $legacyHeadline = false;
3909                                 }
3910                         } else {
3911                                 $legacyHeadline = false;
3912                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3913                                         'noninitial' );
3914                         }
3915
3916                         # HTML names must be case-insensitively unique (bug 10721).
3917                         # This does not apply to Unicode characters per
3918                         # http://dev.w3.org/html5/spec/infrastructure.html#case-sensitivity-and-string-comparison
3919                         # FIXME: We may be changing them depending on the current locale.
3920                         $arrayKey = strtolower( $safeHeadline );
3921                         if ( $legacyHeadline === false ) {
3922                                 $legacyArrayKey = false;
3923                         } else {
3924                                 $legacyArrayKey = strtolower( $legacyHeadline );
3925                         }
3926
3927                         # count how many in assoc. array so we can track dupes in anchors
3928                         if ( isset( $refers[$arrayKey] ) ) {
3929                                 $refers[$arrayKey]++;
3930                         } else {
3931                                 $refers[$arrayKey] = 1;
3932                         }
3933                         if ( isset( $refers[$legacyArrayKey] ) ) {
3934                                 $refers[$legacyArrayKey]++;
3935                         } else {
3936                                 $refers[$legacyArrayKey] = 1;
3937                         }
3938
3939                         # Don't number the heading if it is the only one (looks silly)
3940                         if ( $doNumberHeadings && count( $matches[3] ) > 1) {
3941                                 # the two are different if the line contains a link
3942                                 $headline = $numbering . ' ' . $headline;
3943                         }
3944
3945                         # Create the anchor for linking from the TOC to the section
3946                         $anchor = $safeHeadline;
3947                         $legacyAnchor = $legacyHeadline;
3948                         if ( $refers[$arrayKey] > 1 ) {
3949                                 $anchor .= '_' . $refers[$arrayKey];
3950                         }
3951                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3952                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3953                         }
3954                         if ( $enoughToc && ( !isset( $wgMaxTocLevel ) || $toclevel < $wgMaxTocLevel ) ) {
3955                                 $toc .= $sk->tocLine( $anchor, $tocline,
3956                                         $numbering, $toclevel, ( $isTemplate ? false : $sectionIndex ) );
3957                         }
3958
3959                         # Add the section to the section tree
3960                         # Find the DOM node for this header
3961                         while ( $node && !$isTemplate ) {
3962                                 if ( $node->getName() === 'h' ) {
3963                                         $bits = $node->splitHeading();
3964                                         if ( $bits['i'] == $sectionIndex ) {
3965                                                 break;
3966                                         }
3967                                 }
3968                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3969                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3970                                 $node = $node->getNextSibling();
3971                         }
3972                         $tocraw[] = array(
3973                                 'toclevel' => $toclevel,
3974                                 'level' => $level,
3975                                 'line' => $tocline,
3976                                 'number' => $numbering,
3977                                 'index' => ( $isTemplate ? 'T-' : '' ) . $sectionIndex,
3978                                 'fromtitle' => $titleText,
3979                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3980                                 'anchor' => $anchor,
3981                         );
3982
3983                         # give headline the correct <h#> tag
3984                         if ( $showEditLink && $sectionIndex !== false ) {
3985                                 // Output edit section links as markers with styles that can be customized by skins
3986                                 if ( $isTemplate ) {
3987                                         # Put a T flag in the section identifier, to indicate to extractSections()
3988                                         # that sections inside <includeonly> should be counted.
3989                                         $editlinkArgs = array( $titleText, "T-$sectionIndex"/*, null */ );
3990                                 } else {
3991                                         $editlinkArgs = array( $this->mTitle->getPrefixedText(), $sectionIndex, $headlineHint );
3992                                 }
3993                                 // We use a bit of pesudo-xml for editsection markers. The language converter is run later on
3994                                 // Using a UNIQ style marker leads to the converter screwing up the tokens when it converts stuff
3995                                 // And trying to insert strip tags fails too. At this point all real inputted tags have already been escaped
3996                                 // so we don't have to worry about a user trying to input one of these markers directly.
3997                                 // We use a page and section attribute to stop the language converter from converting these important bits
3998                                 // of data, but put the headline hint inside a content block because the language converter is supposed to
3999                                 // be able to convert that piece of data.
4000                                 $editlink = '<editsection page="' . htmlspecialchars($editlinkArgs[0]);
4001                                 $editlink .= '" section="' . htmlspecialchars($editlinkArgs[1]) .'"';
4002                                 if ( isset($editlinkArgs[2]) ) {
4003                                         $editlink .= '>' . $editlinkArgs[2] . '</editsection>';
4004                                 } else {
4005                                         $editlink .= '/>';
4006                                 }
4007                         } else {
4008                                 $editlink = '';
4009                         }
4010                         $head[$headlineCount] = $sk->makeHeadline( $level,
4011                                 $matches['attrib'][$headlineCount], $anchor, $headline,
4012                                 $editlink, $legacyAnchor );
4013
4014                         $headlineCount++;
4015                 }
4016
4017                 $this->setOutputType( $oldType );
4018
4019                 # Never ever show TOC if no headers
4020                 if ( $numVisible < 1 ) {
4021                         $enoughToc = false;
4022                 }
4023
4024                 if ( $enoughToc ) {
4025                         if ( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
4026                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
4027                         }
4028                         $toc = $sk->tocList( $toc );
4029                         $this->mOutput->setTOCHTML( $toc );
4030                 }
4031
4032                 if ( $isMain ) {
4033                         $this->mOutput->setSections( $tocraw );
4034                 }
4035
4036                 # split up and insert constructed headlines
4037
4038                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
4039                 $i = 0;
4040
4041                 foreach ( $blocks as $block ) {
4042                         if ( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
4043                                 # This is the [edit] link that appears for the top block of text when
4044                                 # section editing is enabled
4045
4046                                 # Disabled because it broke block formatting
4047                                 # For example, a bullet point in the top line
4048                                 # $full .= $sk->editSectionLink(0);
4049                         }
4050                         $full .= $block;
4051                         if ( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
4052                                 # Top anchor now in skin
4053                                 $full = $full.$toc;
4054                         }
4055
4056                         if ( !empty( $head[$i] ) ) {
4057                                 $full .= $head[$i];
4058                         }
4059                         $i++;
4060                 }
4061                 if ( $this->mForceTocPosition ) {
4062                         return str_replace( '<!--MWTOC-->', $toc, $full );
4063                 } else {
4064                         return $full;
4065                 }
4066         }
4067
4068         /**
4069          * Transform wiki markup when saving a page by doing \r\n -> \n
4070          * conversion, substitting signatures, {{subst:}} templates, etc.
4071          *
4072          * @param $text String: the text to transform
4073          * @param $title Title: the Title object for the current article
4074          * @param $user User: the User object describing the current user
4075          * @param $options ParserOptions: parsing options
4076          * @param $clearState Boolean: whether to clear the parser state first
4077          * @return String: the altered wiki markup
4078          */
4079         public function preSaveTransform( $text, Title $title, User $user, ParserOptions $options, $clearState = true ) {
4080                 $this->mOptions = $options;
4081                 $this->setTitle( $title );
4082                 $this->setUser( $user );
4083                 $this->setOutputType( self::OT_WIKI );
4084
4085                 if ( $clearState ) {
4086                         $this->clearState();
4087                 }
4088
4089                 $pairs = array(
4090                         "\r\n" => "\n",
4091                 );
4092                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
4093                 if( $options->getPreSaveTransform() ) {
4094                         $text = $this->pstPass2( $text, $user );
4095                 }
4096                 $text = $this->mStripState->unstripBoth( $text );
4097
4098                 $this->setUser( null ); #Reset
4099
4100                 return $text;
4101         }
4102
4103         /**
4104          * Pre-save transform helper function
4105          * @private
4106          */
4107         function pstPass2( $text, $user ) {
4108                 global $wgContLang, $wgLocaltimezone;
4109
4110                 # Note: This is the timestamp saved as hardcoded wikitext to
4111                 # the database, we use $wgContLang here in order to give
4112                 # everyone the same signature and use the default one rather
4113                 # than the one selected in each user's preferences.
4114                 # (see also bug 12815)
4115                 $ts = $this->mOptions->getTimestamp();
4116                 if ( isset( $wgLocaltimezone ) ) {
4117                         $tz = $wgLocaltimezone;
4118                 } else {
4119                         $tz = date_default_timezone_get();
4120                 }
4121
4122                 $unixts = wfTimestamp( TS_UNIX, $ts );
4123                 $oldtz = date_default_timezone_get();
4124                 date_default_timezone_set( $tz );
4125                 $ts = date( 'YmdHis', $unixts );
4126                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
4127
4128                 # Allow translation of timezones through wiki. date() can return
4129                 # whatever crap the system uses, localised or not, so we cannot
4130                 # ship premade translations.
4131                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
4132                 $msg = wfMessage( $key )->inContentLanguage();
4133                 if ( $msg->exists() ) {
4134                         $tzMsg = $msg->text();
4135                 }
4136
4137                 date_default_timezone_set( $oldtz );
4138
4139                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4140
4141                 # Variable replacement
4142                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4143                 $text = $this->replaceVariables( $text );
4144
4145                 # Signatures
4146                 $sigText = $this->getUserSig( $user );
4147                 $text = strtr( $text, array(
4148                         '~~~~~' => $d,
4149                         '~~~~' => "$sigText $d",
4150                         '~~~' => $sigText
4151                 ) );
4152
4153                 # Context links: [[|name]] and [[name (context)|]]
4154                 global $wgLegalTitleChars;
4155                 $tc = "[$wgLegalTitleChars]";
4156                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4157
4158                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
4159                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
4160                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4161                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4162
4163                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4164                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4165                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4166                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4167
4168                 $t = $this->mTitle->getText();
4169                 $m = array();
4170                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4171                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4172                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4173                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4174                 } else {
4175                         # if there's no context, don't bother duplicating the title
4176                         $text = preg_replace( $p2, '[[\\1]]', $text );
4177                 }
4178
4179                 # Trim trailing whitespace
4180                 $text = rtrim( $text );
4181
4182                 return $text;
4183         }
4184
4185         /**
4186          * Fetch the user's signature text, if any, and normalize to
4187          * validated, ready-to-insert wikitext.
4188          * If you have pre-fetched the nickname or the fancySig option, you can
4189          * specify them here to save a database query.
4190          *
4191          * @param $user User
4192          * @param $nickname String: nickname to use or false to use user's default nickname
4193          * @param $fancySig Boolean: whether the nicknname is the complete signature
4194          *                  or null to use default value
4195          * @return string
4196          */
4197         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4198                 global $wgMaxSigChars;
4199
4200                 $username = $user->getName();
4201
4202                 # If not given, retrieve from the user object.
4203                 if ( $nickname === false )
4204                         $nickname = $user->getOption( 'nickname' );
4205
4206                 if ( is_null( $fancySig ) ) {
4207                         $fancySig = $user->getBoolOption( 'fancysig' );
4208                 }
4209
4210                 $nickname = $nickname == null ? $username : $nickname;
4211
4212                 if ( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4213                         $nickname = $username;
4214                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4215                 } elseif ( $fancySig !== false ) {
4216                         # Sig. might contain markup; validate this
4217                         if ( $this->validateSig( $nickname ) !== false ) {
4218                                 # Validated; clean up (if needed) and return it
4219                                 return $this->cleanSig( $nickname, true );
4220                         } else {
4221                                 # Failed to validate; fall back to the default
4222                                 $nickname = $username;
4223                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4224                         }
4225                 }
4226
4227                 # Make sure nickname doesnt get a sig in a sig
4228                 $nickname = $this->cleanSigInSig( $nickname );
4229
4230                 # If we're still here, make it a link to the user page
4231                 $userText = wfEscapeWikiText( $username );
4232                 $nickText = wfEscapeWikiText( $nickname );
4233                 if ( $user->isAnon() )  {
4234                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4235                 } else {
4236                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4237                 }
4238         }
4239
4240         /**
4241          * Check that the user's signature contains no bad XML
4242          *
4243          * @param $text String
4244          * @return mixed An expanded string, or false if invalid.
4245          */
4246         function validateSig( $text ) {
4247                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4248         }
4249
4250         /**
4251          * Clean up signature text
4252          *
4253          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4254          * 2) Substitute all transclusions
4255          *
4256          * @param $text String
4257          * @param $parsing Whether we're cleaning (preferences save) or parsing
4258          * @return String: signature text
4259          */
4260         function cleanSig( $text, $parsing = false ) {
4261                 if ( !$parsing ) {
4262                         global $wgTitle;
4263                         $this->mOptions = new ParserOptions;
4264                         $this->clearState();
4265                         $this->setTitle( $wgTitle );
4266                         $this->setOutputType = self::OT_PREPROCESS;
4267                 }
4268
4269                 # Option to disable this feature
4270                 if ( !$this->mOptions->getCleanSignatures() ) {
4271                         return $text;
4272                 }
4273
4274                 # FIXME: regex doesn't respect extension tags or nowiki
4275                 #  => Move this logic to braceSubstitution()
4276                 $substWord = MagicWord::get( 'subst' );
4277                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4278                 $substText = '{{' . $substWord->getSynonym( 0 );
4279
4280                 $text = preg_replace( $substRegex, $substText, $text );
4281                 $text = $this->cleanSigInSig( $text );
4282                 $dom = $this->preprocessToDom( $text );
4283                 $frame = $this->getPreprocessor()->newFrame();
4284                 $text = $frame->expand( $dom );
4285
4286                 if ( !$parsing ) {
4287                         $text = $this->mStripState->unstripBoth( $text );
4288                 }
4289
4290                 return $text;
4291         }
4292
4293         /**
4294          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4295          *
4296          * @param $text String
4297          * @return String: signature text with /~{3,5}/ removed
4298          */
4299         function cleanSigInSig( $text ) {
4300                 $text = preg_replace( '/~{3,5}/', '', $text );
4301                 return $text;
4302         }
4303
4304         /**
4305          * Set up some variables which are usually set up in parse()
4306          * so that an external function can call some class members with confidence
4307          */
4308         public function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4309                 $this->setTitle( $title );
4310                 $this->mOptions = $options;
4311                 $this->setOutputType( $outputType );
4312                 if ( $clearState ) {
4313                         $this->clearState();
4314                 }
4315         }
4316
4317         /**
4318          * Wrapper for preprocess()
4319          *
4320          * @param $text String: the text to preprocess
4321          * @param $options ParserOptions: options
4322          * @return String
4323          */
4324         public function transformMsg( $text, $options ) {
4325                 global $wgTitle;
4326                 static $executing = false;
4327
4328                 # Guard against infinite recursion
4329                 if ( $executing ) {
4330                         return $text;
4331                 }
4332                 $executing = true;
4333
4334                 wfProfileIn( __METHOD__ );
4335                 $text = $this->preprocess( $text, $wgTitle, $options );
4336
4337                 $executing = false;
4338                 wfProfileOut( __METHOD__ );
4339                 return $text;
4340         }
4341
4342         /**
4343          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4344          * The callback should have the following form:
4345          *    function myParserHook( $text, $params, $parser ) { ... }
4346          *
4347          * Transform and return $text. Use $parser for any required context, e.g. use
4348          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4349          *
4350          * @param $tag Mixed: the tag to use, e.g. 'hook' for <hook>
4351          * @param $callback Mixed: the callback function (and object) to use for the tag
4352          * @return The old value of the mTagHooks array associated with the hook
4353          */
4354         public function setHook( $tag, $callback ) {
4355                 $tag = strtolower( $tag );
4356                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) throw new MWException( "Invalid character {$m[0]} in setHook('$tag', ...) call" );
4357                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4358                 $this->mTagHooks[$tag] = $callback;
4359                 if ( !in_array( $tag, $this->mStripList ) ) {
4360                         $this->mStripList[] = $tag;
4361                 }
4362
4363                 return $oldVal;
4364         }
4365
4366         function setTransparentTagHook( $tag, $callback ) {
4367                 $tag = strtolower( $tag );
4368                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) throw new MWException( "Invalid character {$m[0]} in setTransparentHook('$tag', ...) call" );
4369                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4370                 $this->mTransparentTagHooks[$tag] = $callback;
4371
4372                 return $oldVal;
4373         }
4374
4375         /**
4376          * Remove all tag hooks
4377          */
4378         function clearTagHooks() {
4379                 $this->mTagHooks = array();
4380                 $this->mStripList = $this->mDefaultStripList;
4381         }
4382
4383         /**
4384          * Create a function, e.g. {{sum:1|2|3}}
4385          * The callback function should have the form:
4386          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4387          *
4388          * Or with SFH_OBJECT_ARGS:
4389          *    function myParserFunction( $parser, $frame, $args ) { ... }
4390          *
4391          * The callback may either return the text result of the function, or an array with the text
4392          * in element 0, and a number of flags in the other elements. The names of the flags are
4393          * specified in the keys. Valid flags are:
4394          *   found                     The text returned is valid, stop processing the template. This
4395          *                             is on by default.
4396          *   nowiki                    Wiki markup in the return value should be escaped
4397          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4398          *
4399          * @param $id String: The magic word ID
4400          * @param $callback Mixed: the callback function (and object) to use
4401          * @param $flags Integer: a combination of the following flags:
4402          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4403          *
4404          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4405          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4406          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4407          *     the arguments, and to control the way they are expanded.
4408          *
4409          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4410          *     arguments, for instance:
4411          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4412          *
4413          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4414          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4415          *     working if/when this is changed.
4416          *
4417          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4418          *     expansion.
4419          *
4420          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4421          *     about the methods available in PPFrame and PPNode.
4422          *
4423          * @return The old callback function for this name, if any
4424          */
4425         public function setFunctionHook( $id, $callback, $flags = 0 ) {
4426                 global $wgContLang;
4427
4428                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4429                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4430
4431                 # Add to function cache
4432                 $mw = MagicWord::get( $id );
4433                 if ( !$mw )
4434                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4435
4436                 $synonyms = $mw->getSynonyms();
4437                 $sensitive = intval( $mw->isCaseSensitive() );
4438
4439                 foreach ( $synonyms as $syn ) {
4440                         # Case
4441                         if ( !$sensitive ) {
4442                                 $syn = $wgContLang->lc( $syn );
4443                         }
4444                         # Add leading hash
4445                         if ( !( $flags & SFH_NO_HASH ) ) {
4446                                 $syn = '#' . $syn;
4447                         }
4448                         # Remove trailing colon
4449                         if ( substr( $syn, -1, 1 ) === ':' ) {
4450                                 $syn = substr( $syn, 0, -1 );
4451                         }
4452                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4453                 }
4454                 return $oldVal;
4455         }
4456
4457         /**
4458          * Get all registered function hook identifiers
4459          *
4460          * @return Array
4461          */
4462         function getFunctionHooks() {
4463                 return array_keys( $this->mFunctionHooks );
4464         }
4465
4466         /**
4467          * Create a tag function, e.g. <test>some stuff</test>.
4468          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4469          * Unlike parser functions, their content is not preprocessed.
4470          */
4471         function setFunctionTagHook( $tag, $callback, $flags ) {
4472                 $tag = strtolower( $tag );
4473                 if ( preg_match( '/[<>\r\n]/', $tag, $m ) ) throw new MWException( "Invalid character {$m[0]} in setFunctionTagHook('$tag', ...) call" );
4474                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4475                         $this->mFunctionTagHooks[$tag] : null;
4476                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4477
4478                 if ( !in_array( $tag, $this->mStripList ) ) {
4479                         $this->mStripList[] = $tag;
4480                 }
4481
4482                 return $old;
4483         }
4484
4485         /**
4486          * FIXME: update documentation. makeLinkObj() is deprecated.
4487          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4488          * Placeholders created in Skin::makeLinkObj()
4489          * Returns an array of link CSS classes, indexed by PDBK.
4490          */
4491         function replaceLinkHolders( &$text, $options = 0 ) {
4492                 return $this->mLinkHolders->replace( $text );
4493         }
4494
4495         /**
4496          * Replace <!--LINK--> link placeholders with plain text of links
4497          * (not HTML-formatted).
4498          *
4499          * @param $text String
4500          * @return String
4501          */
4502         function replaceLinkHoldersText( $text ) {
4503                 return $this->mLinkHolders->replaceText( $text );
4504         }
4505
4506         /**
4507          * Renders an image gallery from a text with one line per image.
4508          * text labels may be given by using |-style alternative text. E.g.
4509          *   Image:one.jpg|The number "1"
4510          *   Image:tree.jpg|A tree
4511          * given as text will return the HTML of a gallery with two images,
4512          * labeled 'The number "1"' and
4513          * 'A tree'.
4514          */
4515         function renderImageGallery( $text, $params ) {
4516                 $ig = new ImageGallery();
4517                 $ig->setContextTitle( $this->mTitle );
4518                 $ig->setShowBytes( false );
4519                 $ig->setShowFilename( false );
4520                 $ig->setParser( $this );
4521                 $ig->setHideBadImages();
4522                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4523                 $ig->useSkin( $this->mOptions->getSkin( $this->mTitle ) );
4524                 $ig->mRevisionId = $this->mRevisionId;
4525
4526                 if ( isset( $params['showfilename'] ) ) {
4527                         $ig->setShowFilename( true );
4528                 } else {
4529                         $ig->setShowFilename( false );
4530                 }
4531                 if ( isset( $params['caption'] ) ) {
4532                         $caption = $params['caption'];
4533                         $caption = htmlspecialchars( $caption );
4534                         $caption = $this->replaceInternalLinks( $caption );
4535                         $ig->setCaptionHtml( $caption );
4536                 }
4537                 if ( isset( $params['perrow'] ) ) {
4538                         $ig->setPerRow( $params['perrow'] );
4539                 }
4540                 if ( isset( $params['widths'] ) ) {
4541                         $ig->setWidths( $params['widths'] );
4542                 }
4543                 if ( isset( $params['heights'] ) ) {
4544                         $ig->setHeights( $params['heights'] );
4545                 }
4546
4547                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4548
4549                 $lines = StringUtils::explode( "\n", $text );
4550                 foreach ( $lines as $line ) {
4551                         # match lines like these:
4552                         # Image:someimage.jpg|This is some image
4553                         $matches = array();
4554                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4555                         # Skip empty lines
4556                         if ( count( $matches ) == 0 ) {
4557                                 continue;
4558                         }
4559
4560                         if ( strpos( $matches[0], '%' ) !== false ) {
4561                                 $matches[1] = rawurldecode( $matches[1] );
4562                         }
4563                         $tp = Title::newFromText( $matches[1], NS_FILE );
4564                         $nt =& $tp;
4565                         if ( is_null( $nt ) ) {
4566                                 # Bogus title. Ignore these so we don't bomb out later.
4567                                 continue;
4568                         }
4569                         if ( isset( $matches[3] ) ) {
4570                                 $label = $matches[3];
4571                         } else {
4572                                 $label = '';
4573                         }
4574
4575                         $html = $this->recursiveTagParse( trim( $label ) );
4576
4577                         $ig->add( $nt, $html );
4578
4579                         # Only add real images (bug #5586)
4580                         if ( $nt->getNamespace() == NS_FILE ) {
4581                                 $this->mOutput->addImage( $nt->getDBkey() );
4582                         }
4583                 }
4584                 return $ig->toHTML();
4585         }
4586
4587         function getImageParams( $handler ) {
4588                 if ( $handler ) {
4589                         $handlerClass = get_class( $handler );
4590                 } else {
4591                         $handlerClass = '';
4592                 }
4593                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4594                         # Initialise static lists
4595                         static $internalParamNames = array(
4596                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4597                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4598                                         'bottom', 'text-bottom' ),
4599                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4600                                         'upright', 'border', 'link', 'alt' ),
4601                         );
4602                         static $internalParamMap;
4603                         if ( !$internalParamMap ) {
4604                                 $internalParamMap = array();
4605                                 foreach ( $internalParamNames as $type => $names ) {
4606                                         foreach ( $names as $name ) {
4607                                                 $magicName = str_replace( '-', '_', "img_$name" );
4608                                                 $internalParamMap[$magicName] = array( $type, $name );
4609                                         }
4610                                 }
4611                         }
4612
4613                         # Add handler params
4614                         $paramMap = $internalParamMap;
4615                         if ( $handler ) {
4616                                 $handlerParamMap = $handler->getParamMap();
4617                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4618                                         $paramMap[$magic] = array( 'handler', $paramName );
4619                                 }
4620                         }
4621                         $this->mImageParams[$handlerClass] = $paramMap;
4622                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4623                 }
4624                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4625         }
4626
4627         /**
4628          * Parse image options text and use it to make an image
4629          *
4630          * @param $title Title
4631          * @param $options String
4632          * @param $holders LinkHolderArray
4633          */
4634         function makeImage( $title, $options, $holders = false ) {
4635                 # Check if the options text is of the form "options|alt text"
4636                 # Options are:
4637                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4638                 #  * left       no resizing, just left align. label is used for alt= only
4639                 #  * right      same, but right aligned
4640                 #  * none       same, but not aligned
4641                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4642                 #  * center     center the image
4643                 #  * frame      Keep original image size, no magnify-button.
4644                 #  * framed     Same as "frame"
4645                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4646                 #  * upright    reduce width for upright images, rounded to full __0 px
4647                 #  * border     draw a 1px border around the image
4648                 #  * alt        Text for HTML alt attribute (defaults to empty)
4649                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4650                 # vertical-align values (no % or length right now):
4651                 #  * baseline
4652                 #  * sub
4653                 #  * super
4654                 #  * top
4655                 #  * text-top
4656                 #  * middle
4657                 #  * bottom
4658                 #  * text-bottom
4659
4660                 $parts = StringUtils::explode( "|", $options );
4661                 $sk = $this->mOptions->getSkin( $this->mTitle );
4662
4663                 # Give extensions a chance to select the file revision for us
4664                 $skip = $time = $descQuery = false;
4665                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4666
4667                 if ( $skip ) {
4668                         return $sk->link( $title );
4669                 }
4670
4671                 # Get the file
4672                 $file = wfFindFile( $title, array( 'time' => $time ) );
4673                 # Get parameter map
4674                 $handler = $file ? $file->getHandler() : false;
4675
4676                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4677
4678                 # Process the input parameters
4679                 $caption = '';
4680                 $params = array( 'frame' => array(), 'handler' => array(),
4681                         'horizAlign' => array(), 'vertAlign' => array() );
4682                 foreach ( $parts as $part ) {
4683                         $part = trim( $part );
4684                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4685                         $validated = false;
4686                         if ( isset( $paramMap[$magicName] ) ) {
4687                                 list( $type, $paramName ) = $paramMap[$magicName];
4688
4689                                 # Special case; width and height come in one variable together
4690                                 if ( $type === 'handler' && $paramName === 'width' ) {
4691                                         $m = array();
4692                                         # (bug 13500) In both cases (width/height and width only),
4693                                         # permit trailing "px" for backward compatibility.
4694                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4695                                                 $width = intval( $m[1] );
4696                                                 $height = intval( $m[2] );
4697                                                 if ( $handler->validateParam( 'width', $width ) ) {
4698                                                         $params[$type]['width'] = $width;
4699                                                         $validated = true;
4700                                                 }
4701                                                 if ( $handler->validateParam( 'height', $height ) ) {
4702                                                         $params[$type]['height'] = $height;
4703                                                         $validated = true;
4704                                                 }
4705                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4706                                                 $width = intval( $value );
4707                                                 if ( $handler->validateParam( 'width', $width ) ) {
4708                                                         $params[$type]['width'] = $width;
4709                                                         $validated = true;
4710                                                 }
4711                                         } # else no validation -- bug 13436
4712                                 } else {
4713                                         if ( $type === 'handler' ) {
4714                                                 # Validate handler parameter
4715                                                 $validated = $handler->validateParam( $paramName, $value );
4716                                         } else {
4717                                                 # Validate internal parameters
4718                                                 switch( $paramName ) {
4719                                                 case 'manualthumb':
4720                                                 case 'alt':
4721                                                         # @todo Fixme: possibly check validity here for
4722                                                         # manualthumb? downstream behavior seems odd with
4723                                                         # missing manual thumbs.
4724                                                         $validated = true;
4725                                                         $value = $this->stripAltText( $value, $holders );
4726                                                         break;
4727                                                 case 'link':
4728                                                         $chars = self::EXT_LINK_URL_CLASS;
4729                                                         $prots = $this->mUrlProtocols;
4730                                                         if ( $value === '' ) {
4731                                                                 $paramName = 'no-link';
4732                                                                 $value = true;
4733                                                                 $validated = true;
4734                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4735                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4736                                                                         $paramName = 'link-url';
4737                                                                         $this->mOutput->addExternalLink( $value );
4738                                                                         if ( $this->mOptions->getExternalLinkTarget() ) {
4739                                                                                 $params[$type]['link-target'] = $this->mOptions->getExternalLinkTarget();
4740                                                                         }
4741                                                                         $validated = true;
4742                                                                 }
4743                                                         } else {
4744                                                                 $linkTitle = Title::newFromText( $value );
4745                                                                 if ( $linkTitle ) {
4746                                                                         $paramName = 'link-title';
4747                                                                         $value = $linkTitle;
4748                                                                         $this->mOutput->addLink( $linkTitle );
4749                                                                         $validated = true;
4750                                                                 }
4751                                                         }
4752                                                         break;
4753                                                 default:
4754                                                         # Most other things appear to be empty or numeric...
4755                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4756                                                 }
4757                                         }
4758
4759                                         if ( $validated ) {
4760                                                 $params[$type][$paramName] = $value;
4761                                         }
4762                                 }
4763                         }
4764                         if ( !$validated ) {
4765                                 $caption = $part;
4766                         }
4767                 }
4768
4769                 # Process alignment parameters
4770                 if ( $params['horizAlign'] ) {
4771                         $params['frame']['align'] = key( $params['horizAlign'] );
4772                 }
4773                 if ( $params['vertAlign'] ) {
4774                         $params['frame']['valign'] = key( $params['vertAlign'] );
4775                 }
4776
4777                 $params['frame']['caption'] = $caption;
4778
4779                 # Will the image be presented in a frame, with the caption below?
4780                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4781                                                  isset( $params['frame']['framed'] ) ||
4782                                                  isset( $params['frame']['thumbnail'] ) ||
4783                                                  isset( $params['frame']['manualthumb'] );
4784
4785                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4786                 # came to also set the caption, ordinary text after the image -- which
4787                 # makes no sense, because that just repeats the text multiple times in
4788                 # screen readers.  It *also* came to set the title attribute.
4789                 #
4790                 # Now that we have an alt attribute, we should not set the alt text to
4791                 # equal the caption: that's worse than useless, it just repeats the
4792                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4793                 # use the unnamed parameter for alt text as well, just for the time be-
4794                 # ing, if the unnamed param is set and the alt param is not.
4795                 #
4796                 # For the future, we need to figure out if we want to tweak this more,
4797                 # e.g., introducing a title= parameter for the title; ignoring the un-
4798                 # named parameter entirely for images without a caption; adding an ex-
4799                 # plicit caption= parameter and preserving the old magic unnamed para-
4800                 # meter for BC; ...
4801                 if ( $imageIsFramed ) { # Framed image
4802                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4803                                 # No caption or alt text, add the filename as the alt text so
4804                                 # that screen readers at least get some description of the image
4805                                 $params['frame']['alt'] = $title->getText();
4806                         }
4807                         # Do not set $params['frame']['title'] because tooltips don't make sense
4808                         # for framed images
4809                 } else { # Inline image
4810                         if ( !isset( $params['frame']['alt'] ) ) {
4811                                 # No alt text, use the "caption" for the alt text
4812                                 if ( $caption !== '') {
4813                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4814                                 } else {
4815                                         # No caption, fall back to using the filename for the
4816                                         # alt text
4817                                         $params['frame']['alt'] = $title->getText();
4818                                 }
4819                         }
4820                         # Use the "caption" for the tooltip text
4821                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4822                 }
4823
4824                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4825
4826                 # Linker does the rest
4827                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery, $this->mOptions->getThumbSize() );
4828
4829                 # Give the handler a chance to modify the parser object
4830                 if ( $handler ) {
4831                         $handler->parserTransformHook( $this, $file );
4832                 }
4833
4834                 return $ret;
4835         }
4836
4837         protected function stripAltText( $caption, $holders ) {
4838                 # Strip bad stuff out of the title (tooltip).  We can't just use
4839                 # replaceLinkHoldersText() here, because if this function is called
4840                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4841                 if ( $holders ) {
4842                         $tooltip = $holders->replaceText( $caption );
4843                 } else {
4844                         $tooltip = $this->replaceLinkHoldersText( $caption );
4845                 }
4846
4847                 # make sure there are no placeholders in thumbnail attributes
4848                 # that are later expanded to html- so expand them now and
4849                 # remove the tags
4850                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4851                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4852
4853                 return $tooltip;
4854         }
4855
4856         /**
4857          * Set a flag in the output object indicating that the content is dynamic and
4858          * shouldn't be cached.
4859          */
4860         function disableCache() {
4861                 wfDebug( "Parser output marked as uncacheable.\n" );
4862                 $this->mOutput->setCacheTime( -1 ); // old style, for compatibility
4863                 $this->mOutput->updateCacheExpiry( 0 ); // new style, for consistency
4864         }
4865
4866         /**
4867          * Callback from the Sanitizer for expanding items found in HTML attribute
4868          * values, so they can be safely tested and escaped.
4869          *
4870          * @param $text String
4871          * @param $frame PPFrame
4872          * @return String
4873          * @private
4874          */
4875         function attributeStripCallback( &$text, $frame = false ) {
4876                 $text = $this->replaceVariables( $text, $frame );
4877                 $text = $this->mStripState->unstripBoth( $text );
4878                 return $text;
4879         }
4880
4881         /**
4882          * Accessor
4883          */
4884         function getTags() {
4885                 return array_merge( array_keys( $this->mTransparentTagHooks ), array_keys( $this->mTagHooks ) );
4886         }
4887
4888         /**
4889          * Break wikitext input into sections, and either pull or replace
4890          * some particular section's text.
4891          *
4892          * External callers should use the getSection and replaceSection methods.
4893          *
4894          * @param $text String: Page wikitext
4895          * @param $section String: a section identifier string of the form:
4896          *   <flag1> - <flag2> - ... - <section number>
4897          *
4898          * Currently the only recognised flag is "T", which means the target section number
4899          * was derived during a template inclusion parse, in other words this is a template
4900          * section edit link. If no flags are given, it was an ordinary section edit link.
4901          * This flag is required to avoid a section numbering mismatch when a section is
4902          * enclosed by <includeonly> (bug 6563).
4903          *
4904          * The section number 0 pulls the text before the first heading; other numbers will
4905          * pull the given section along with its lower-level subsections. If the section is
4906          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4907          *
4908          * @param $mode String: one of "get" or "replace"
4909          * @param $newText String: replacement text for section data.
4910          * @return String: for "get", the extracted section text.
4911          *                 for "replace", the whole page with the section replaced.
4912          */
4913         private function extractSections( $text, $section, $mode, $newText='' ) {
4914                 global $wgTitle;
4915                 $this->mOptions = new ParserOptions;
4916                 $this->clearState();
4917                 $this->setTitle( $wgTitle ); # not generally used but removes an ugly failure mode
4918                 $this->setOutputType( self::OT_PLAIN );
4919                 $outText = '';
4920                 $frame = $this->getPreprocessor()->newFrame();
4921
4922                 # Process section extraction flags
4923                 $flags = 0;
4924                 $sectionParts = explode( '-', $section );
4925                 $sectionIndex = array_pop( $sectionParts );
4926                 foreach ( $sectionParts as $part ) {
4927                         if ( $part === 'T' ) {
4928                                 $flags |= self::PTD_FOR_INCLUSION;
4929                         }
4930                 }
4931                 # Preprocess the text
4932                 $root = $this->preprocessToDom( $text, $flags );
4933
4934                 # <h> nodes indicate section breaks
4935                 # They can only occur at the top level, so we can find them by iterating the root's children
4936                 $node = $root->getFirstChild();
4937
4938                 # Find the target section
4939                 if ( $sectionIndex == 0 ) {
4940                         # Section zero doesn't nest, level=big
4941                         $targetLevel = 1000;
4942                 } else {
4943                         while ( $node ) {
4944                                 if ( $node->getName() === 'h' ) {
4945                                         $bits = $node->splitHeading();
4946                                         if ( $bits['i'] == $sectionIndex ) {
4947                                                 $targetLevel = $bits['level'];
4948                                                 break;
4949                                         }
4950                                 }
4951                                 if ( $mode === 'replace' ) {
4952                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4953                                 }
4954                                 $node = $node->getNextSibling();
4955                         }
4956                 }
4957
4958                 if ( !$node ) {
4959                         # Not found
4960                         if ( $mode === 'get' ) {
4961                                 return $newText;
4962                         } else {
4963                                 return $text;
4964                         }
4965                 }
4966
4967                 # Find the end of the section, including nested sections
4968                 do {
4969                         if ( $node->getName() === 'h' ) {
4970                                 $bits = $node->splitHeading();
4971                                 $curLevel = $bits['level'];
4972                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4973                                         break;
4974                                 }
4975                         }
4976                         if ( $mode === 'get' ) {
4977                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4978                         }
4979                         $node = $node->getNextSibling();
4980                 } while ( $node );
4981
4982                 # Write out the remainder (in replace mode only)
4983                 if ( $mode === 'replace' ) {
4984                         # Output the replacement text
4985                         # Add two newlines on -- trailing whitespace in $newText is conventionally
4986                         # stripped by the editor, so we need both newlines to restore the paragraph gap
4987                         # Only add trailing whitespace if there is newText
4988                         if ( $newText != "" ) {
4989                                 $outText .= $newText . "\n\n";
4990                         }
4991
4992                         while ( $node ) {
4993                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4994                                 $node = $node->getNextSibling();
4995                         }
4996                 }
4997
4998                 if ( is_string( $outText ) ) {
4999                         # Re-insert stripped tags
5000                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
5001                 }
5002
5003                 return $outText;
5004         }
5005
5006         /**
5007          * This function returns the text of a section, specified by a number ($section).
5008          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5009          * the first section before any such heading (section 0).
5010          *
5011          * If a section contains subsections, these are also returned.
5012          *
5013          * @param $text String: text to look in
5014          * @param $section String: section identifier
5015          * @param $deftext String: default to return if section is not found
5016          * @return string text of the requested section
5017          */
5018         public function getSection( $text, $section, $deftext='' ) {
5019                 return $this->extractSections( $text, $section, "get", $deftext );
5020         }
5021
5022         /**
5023          * This function returns $oldtext after the content of the section
5024          * specified by $section has been replaced with $text.
5025          *
5026          * @param $text String: former text of the article
5027          * @param $section Numeric: section identifier
5028          * @param $text String: replacing text
5029          * #return String: modified text
5030          */
5031         public function replaceSection( $oldtext, $section, $text ) {
5032                 return $this->extractSections( $oldtext, $section, "replace", $text );
5033         }
5034
5035         /**
5036          * Get the ID of the revision we are parsing
5037          *
5038          * @return Mixed: integer or null
5039          */
5040         function getRevisionId() {
5041                 return $this->mRevisionId;
5042         }
5043
5044         /**
5045          * Get the revision object for $this->mRevisionId
5046          *
5047          * @return either a Revision object or null
5048          */
5049         protected function getRevisionObject() {
5050                 if ( !is_null( $this->mRevisionObject ) ) {
5051                         return $this->mRevisionObject;
5052                 }
5053                 if ( is_null( $this->mRevisionId ) ) {
5054                         return null;
5055                 }
5056
5057                 $this->mRevisionObject = Revision::newFromId( $this->mRevisionId );
5058                 return $this->mRevisionObject;
5059         }
5060
5061         /**
5062          * Get the timestamp associated with the current revision, adjusted for
5063          * the default server-local timestamp
5064          */
5065         function getRevisionTimestamp() {
5066                 if ( is_null( $this->mRevisionTimestamp ) ) {
5067                         wfProfileIn( __METHOD__ );
5068
5069                         $revObject = $this->getRevisionObject();
5070                         $timestamp = $revObject ? $revObject->getTimestamp() : false;
5071
5072                         if( $timestamp !== false ) {
5073                                 global $wgContLang;
5074
5075                                 # The cryptic '' timezone parameter tells to use the site-default
5076                                 # timezone offset instead of the user settings.
5077                                 #
5078                                 # Since this value will be saved into the parser cache, served
5079                                 # to other users, and potentially even used inside links and such,
5080                                 # it needs to be consistent for all visitors.
5081                                 $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5082                         }
5083
5084                         wfProfileOut( __METHOD__ );
5085                 }
5086                 return $this->mRevisionTimestamp;
5087         }
5088
5089         /**
5090          * Get the name of the user that edited the last revision
5091          *
5092          * @return String: user name
5093          */
5094         function getRevisionUser() {
5095                 if( is_null( $this->mRevisionUser ) ) {
5096                         $revObject = $this->getRevisionObject();
5097
5098                         # if this template is subst: the revision id will be blank,
5099                         # so just use the current user's name
5100                         if( $revObject ) {
5101                                 $this->mRevisionUser = $revObject->getUserText();
5102                         } elseif( $this->ot['wiki'] || $this->mOptions->getIsPreview() ) {
5103                                 $this->mRevisionUser = $this->getUser()->getName();
5104                         }
5105                 }
5106                 return $this->mRevisionUser;
5107         }
5108
5109         /**
5110          * Mutator for $mDefaultSort
5111          *
5112          * @param $sort New value
5113          */
5114         public function setDefaultSort( $sort ) {
5115                 $this->mDefaultSort = $sort;
5116                 $this->mOutput->setProperty( 'defaultsort', $sort );
5117         }
5118
5119         /**
5120          * Accessor for $mDefaultSort
5121          * Will use the title/prefixed title if none is set
5122          *
5123          * @return string
5124          */
5125         public function getDefaultSort() {
5126                 if ( $this->mDefaultSort !== false ) {
5127                         return $this->mDefaultSort;
5128                 } else {
5129                         return $this->mTitle->getCategorySortkey();
5130                 }
5131         }
5132
5133         /**
5134          * Accessor for $mDefaultSort
5135          * Unlike getDefaultSort(), will return false if none is set
5136          *
5137          * @return string or false
5138          */
5139         public function getCustomDefaultSort() {
5140                 return $this->mDefaultSort;
5141         }
5142
5143         /**
5144          * Try to guess the section anchor name based on a wikitext fragment
5145          * presumably extracted from a heading, for example "Header" from
5146          * "== Header ==".
5147          */
5148         public function guessSectionNameFromWikiText( $text ) {
5149                 # Strip out wikitext links(they break the anchor)
5150                 $text = $this->stripSectionName( $text );
5151                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5152                 return '#' . Sanitizer::escapeId( $text, 'noninitial' );
5153         }
5154
5155         /**
5156          * Same as guessSectionNameFromWikiText(), but produces legacy anchors
5157          * instead.  For use in redirects, since IE6 interprets Redirect: headers
5158          * as something other than UTF-8 (apparently?), resulting in breakage.
5159          *
5160          * @param $text String: The section name
5161          * @return string An anchor
5162          */
5163         public function guessLegacySectionNameFromWikiText( $text ) {
5164                 # Strip out wikitext links(they break the anchor)
5165                 $text = $this->stripSectionName( $text );
5166                 $text = Sanitizer::normalizeSectionNameWhitespace( $text );
5167                 return '#' . Sanitizer::escapeId( $text, array( 'noninitial', 'legacy' ) );
5168         }
5169
5170         /**
5171          * Strips a text string of wikitext for use in a section anchor
5172          *
5173          * Accepts a text string and then removes all wikitext from the
5174          * string and leaves only the resultant text (i.e. the result of
5175          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5176          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5177          * to create valid section anchors by mimicing the output of the
5178          * parser when headings are parsed.
5179          *
5180          * @param $text String: text string to be stripped of wikitext
5181          * for use in a Section anchor
5182          * @return Filtered text string
5183          */
5184         public function stripSectionName( $text ) {
5185                 # Strip internal link markup
5186                 $text = preg_replace( '/\[\[:?([^[|]+)\|([^[]+)\]\]/', '$2', $text );
5187                 $text = preg_replace( '/\[\[:?([^[]+)\|?\]\]/', '$1', $text );
5188
5189                 # Strip external link markup (FIXME: Not Tolerant to blank link text
5190                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5191                 # on how many empty links there are on the page - need to figure that out.
5192                 $text = preg_replace( '/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/', '$2', $text );
5193
5194                 # Parse wikitext quotes (italics & bold)
5195                 $text = $this->doQuotes( $text );
5196
5197                 # Strip HTML tags
5198                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5199                 return $text;
5200         }
5201
5202         /**
5203          * strip/replaceVariables/unstrip for preprocessor regression testing
5204          */
5205         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5206                 $this->mOptions = $options;
5207                 $this->clearState();
5208                 if ( !$title instanceof Title ) {
5209                         $title = Title::newFromText( $title );
5210                 }
5211                 $this->mTitle = $title;
5212                 $this->setOutputType( $outputType );
5213                 $text = $this->replaceVariables( $text );
5214                 $text = $this->mStripState->unstripBoth( $text );
5215                 $text = Sanitizer::removeHTMLtags( $text );
5216                 return $text;
5217         }
5218
5219         function testPst( $text, $title, $options ) {
5220                 global $wgUser;
5221                 if ( !$title instanceof Title ) {
5222                         $title = Title::newFromText( $title );
5223                 }
5224                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5225         }
5226
5227         function testPreprocess( $text, $title, $options ) {
5228                 if ( !$title instanceof Title ) {
5229                         $title = Title::newFromText( $title );
5230                 }
5231                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5232         }
5233
5234         function markerSkipCallback( $s, $callback ) {
5235                 $i = 0;
5236                 $out = '';
5237                 while ( $i < strlen( $s ) ) {
5238                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5239                         if ( $markerStart === false ) {
5240                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5241                                 break;
5242                         } else {
5243                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5244                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5245                                 if ( $markerEnd === false ) {
5246                                         $out .= substr( $s, $markerStart );
5247                                         break;
5248                                 } else {
5249                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5250                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5251                                         $i = $markerEnd;
5252                                 }
5253                         }
5254                 }
5255                 return $out;
5256         }
5257
5258         function serialiseHalfParsedText( $text ) {
5259                 $data = array();
5260                 $data['text'] = $text;
5261
5262                 # First, find all strip markers, and store their
5263                 #  data in an array.
5264                 $stripState = new StripState;
5265                 $pos = 0;
5266                 while ( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) )
5267                         && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) )
5268                 {
5269                         $end_pos += strlen( self::MARKER_SUFFIX );
5270                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5271
5272                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5273                                 $replaceArray = $stripState->general;
5274                                 $stripText = $this->mStripState->general->data[$marker];
5275                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5276                                 $replaceArray = $stripState->nowiki;
5277                                 $stripText = $this->mStripState->nowiki->data[$marker];
5278                         } else {
5279                                 throw new MWException( "Hanging strip marker: '$marker'." );
5280                         }
5281
5282                         $replaceArray->setPair( $marker, $stripText );
5283                         $pos = $end_pos;
5284                 }
5285                 $data['stripstate'] = $stripState;
5286
5287                 # Now, find all of our links, and store THEIR
5288                 #  data in an array! :)
5289                 $links = array( 'internal' => array(), 'interwiki' => array() );
5290                 $pos = 0;
5291
5292                 # Internal links
5293                 while ( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5294                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5295
5296                         $ns = trim( $ns );
5297                         if ( empty( $links['internal'][$ns] ) ) {
5298                                 $links['internal'][$ns] = array();
5299                         }
5300
5301                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5302                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5303                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5304                 }
5305
5306                 $pos = 0;
5307
5308                 # Interwiki links
5309                 while ( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5310                         $data = substr( $text, $start_pos );
5311                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5312                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5313                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5314                 }
5315
5316                 $data['linkholder'] = $links;
5317
5318                 return $data;
5319         }
5320
5321         /**
5322          * TODO: document
5323          * @param $data Array
5324          * @param $intPrefix String unique identifying prefix
5325          * @return String
5326          */
5327         function unserialiseHalfParsedText( $data, $intPrefix = null ) {
5328                 if ( !$intPrefix ) {
5329                         $intPrefix = self::getRandomString();
5330                 }
5331
5332                 # First, extract the strip state.
5333                 $stripState = $data['stripstate'];
5334                 $this->mStripState->general->merge( $stripState->general );
5335                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5336
5337                 # Now, extract the text, and renumber links
5338                 $text = $data['text'];
5339                 $links = $data['linkholder'];
5340
5341                 # Internal...
5342                 foreach ( $links['internal'] as $ns => $nsLinks ) {
5343                         foreach ( $nsLinks as $key => $entry ) {
5344                                 $newKey = $intPrefix . '-' . $key;
5345                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5346
5347                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5348                         }
5349                 }
5350
5351                 # Interwiki...
5352                 foreach ( $links['interwiki'] as $key => $entry ) {
5353                         $newKey = "$intPrefix-$key";
5354                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5355
5356                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5357                 }
5358
5359                 # Should be good to go.
5360                 return $text;
5361         }
5362 }
5363
5364 /**
5365  * @todo document, briefly.
5366  * @ingroup Parser
5367  */
5368 class StripState {
5369         var $general, $nowiki;
5370
5371         function __construct() {
5372                 $this->general = new ReplacementArray;
5373                 $this->nowiki = new ReplacementArray;
5374         }
5375
5376         function unstripGeneral( $text ) {
5377                 wfProfileIn( __METHOD__ );
5378                 do {
5379                         $oldText = $text;
5380                         $text = $this->general->replace( $text );
5381                 } while ( $text !== $oldText );
5382                 wfProfileOut( __METHOD__ );
5383                 return $text;
5384         }
5385
5386         function unstripNoWiki( $text ) {
5387                 wfProfileIn( __METHOD__ );
5388                 do {
5389                         $oldText = $text;
5390                         $text = $this->nowiki->replace( $text );
5391                 } while ( $text !== $oldText );
5392                 wfProfileOut( __METHOD__ );
5393                 return $text;
5394         }
5395
5396         function unstripBoth( $text ) {
5397                 wfProfileIn( __METHOD__ );
5398                 do {
5399                         $oldText = $text;
5400                         $text = $this->general->replace( $text );
5401                         $text = $this->nowiki->replace( $text );
5402                 } while ( $text !== $oldText );
5403                 wfProfileOut( __METHOD__ );
5404                 return $text;
5405         }
5406 }
5407
5408 /**
5409  * @todo document, briefly.
5410  * @ingroup Parser
5411  */
5412 class OnlyIncludeReplacer {
5413         var $output = '';
5414
5415         function replace( $matches ) {
5416                 if ( substr( $matches[1], -1 ) === "\n" ) {
5417                         $this->output .= substr( $matches[1], 0, -1 );
5418                 } else {
5419                         $this->output .= $matches[1];
5420                 }
5421         }
5422 }