includes/parser/Parser.php

   1 <?php
   2 /**
   3  * @defgroup Parser Parser
   4  *
   5  * @file
   6  * @ingroup Parser
   7  * File for Parser and related classes
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *     produces HTML output
  21  * preSaveTransform().
  22  *     produces altered wiki markup.
  23  * preprocess()
  24  *     removes HTML comments and expands templates
  25  * cleanSig()
  26  *     Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *     Extracts sections from an article for section editing
  29  * getPreloadText()
  30  *     Removes <noinclude> sections, and <includeonly> tags.
  31  *
  32  * Globals used:
  33  *    objects:   $wgLang, $wgContLang
  34  *
  35  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  36  *
  37  * settings:
  38  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  39  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  40  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  41  *  $wgMaxArticleSize*
  42  *
  43  *  * only within ParserOptions
  44  * </pre>
  45  *
  46  * @ingroup Parser
  47  */
  48 class Parser {
  49         /**
  50          * Update this version number when the ParserOutput format
  51          * changes in an incompatible way, so the parser cache
  52          * can automatically discard old data.
  53          */
  54         const VERSION = '1.6.4';
  55
  56         # Flags for Parser::setFunctionHook
  57         # Also available as global constants from Defines.php
  58         const SFH_NO_HASH = 1;
  59         const SFH_OBJECT_ARGS = 2;
  60
  61         # Constants needed for external link processing
  62         # Everything except bracket, space, or control characters
  63         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  64         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  65                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  66
  67         # State constants for the definition list colon extraction
  68         const COLON_STATE_TEXT = 0;
  69         const COLON_STATE_TAG = 1;
  70         const COLON_STATE_TAGSTART = 2;
  71         const COLON_STATE_CLOSETAG = 3;
  72         const COLON_STATE_TAGSLASH = 4;
  73         const COLON_STATE_COMMENT = 5;
  74         const COLON_STATE_COMMENTDASH = 6;
  75         const COLON_STATE_COMMENTDASHDASH = 7;
  76
  77         # Flags for preprocessToDom
  78         const PTD_FOR_INCLUSION = 1;
  79
  80         # Allowed values for $this->mOutputType
  81         # Parameter to startExternalParse().
  82         const OT_HTML = 1; # like parse()
  83         const OT_WIKI = 2; # like preSaveTransform()
  84         const OT_PREPROCESS = 3; # like preprocess()
  85         const OT_MSG = 3;
  86         const OT_PLAIN = 4; # like extractSections() - portions of the original are returned unchanged.
  87
  88         # Marker Suffix needs to be accessible staticly.
  89         const MARKER_SUFFIX = "-QINU\x7f";
  90
  91         # Persistent:
  92         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables;
  93         var $mSubstWords, $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerIndex;
  94         var $mPreprocessor, $mExtLinkBracketedRegex, $mUrlProtocols, $mDefaultStripList;
  95         var $mVarCache, $mConf, $mFunctionTagHooks;
  96
  97
  98         # Cleared with clearState():
  99         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 100         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 101         var $mLinkHolders, $mLinkID;
 102         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
 103         var $mTplExpandCache; # empty-frame expansion cache
 104         var $mTplRedirCache, $mTplDomCache, $mHeadings, $mDoubleUnderscores;
 105         var $mExpensiveFunctionCount; # number of expensive parser function calls
 106
 107         # Temporary
 108         # These are variables reset at least once per parse regardless of $clearState
 109         var $mOptions;      # ParserOptions object
 110         var $mTitle;        # Title context, used for self-link rendering and similar things
 111         var $mOutputType;   # Output type, one of the OT_xxx constants
 112         var $ot;            # Shortcut alias, see setOutputType()
 113         var $mRevisionId;   # ID to display in {{REVISIONID}} tags
 114         var $mRevisionTimestamp; # The timestamp of the specified revision ID
 115         var $mRevIdForTs;   # The revision ID which was used to fetch the timestamp
 116
 117         /**
 118          * Constructor
 119          *
 120          * @public
 121          */
 122         function __construct( $conf = array() ) {
 123                 $this->mConf = $conf;
 124                 $this->mTagHooks = array();
 125                 $this->mTransparentTagHooks = array();
 126                 $this->mFunctionHooks = array();
 127                 $this->mFunctionTagHooks = array();
 128                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 129                 $this->mDefaultStripList = $this->mStripList = array();
 130                 $this->mUrlProtocols = wfUrlProtocols();
 131                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 132                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 133                 $this->mVarCache = array();
 134                 if ( isset( $conf['preprocessorClass'] ) ) {
 135                         $this->mPreprocessorClass = $conf['preprocessorClass'];
 136                 } elseif ( extension_loaded( 'domxml' ) ) {
 137                         # PECL extension that conflicts with the core DOM extension (bug 13770)
 138                         wfDebug( "Warning: you have the obsolete domxml extension for PHP. Please remove it!\n" );
 139                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 140                 } elseif ( extension_loaded( 'dom' ) ) {
 141                         $this->mPreprocessorClass = 'Preprocessor_DOM';
 142                 } else {
 143                         $this->mPreprocessorClass = 'Preprocessor_Hash';
 144                 }
 145                 $this->mMarkerIndex = 0;
 146                 $this->mFirstCall = true;
 147         }
 148
 149         /**
 150          * Reduce memory usage to reduce the impact of circular references
 151          */
 152         function __destruct() {
 153                 if ( isset( $this->mLinkHolders ) ) {
 154                         $this->mLinkHolders->__destruct();
 155                 }
 156                 foreach ( $this as $name => $value ) {
 157                         unset( $this->$name );
 158                 }
 159         }
 160
 161         /**
 162          * Do various kinds of initialisation on the first call of the parser
 163          */
 164         function firstCallInit() {
 165                 if ( !$this->mFirstCall ) {
 166                         return;
 167                 }
 168                 $this->mFirstCall = false;
 169
 170                 wfProfileIn( __METHOD__ );
 171
 172                 CoreParserFunctions::register( $this );
 173                 CoreTagHooks::register( $this );
 174                 $this->initialiseVariables();
 175
 176                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 177                 wfProfileOut( __METHOD__ );
 178         }
 179
 180         /**
 181          * Clear Parser state
 182          *
 183          * @private
 184          */
 185         function clearState() {
 186                 wfProfileIn( __METHOD__ );
 187                 if ( $this->mFirstCall ) {
 188                         $this->firstCallInit();
 189                 }
 190                 $this->mOutput = new ParserOutput;
 191                 $this->mAutonumber = 0;
 192                 $this->mLastSection = '';
 193                 $this->mDTopen = false;
 194                 $this->mIncludeCount = array();
 195                 $this->mStripState = new StripState;
 196                 $this->mArgStack = false;
 197                 $this->mInPre = false;
 198                 $this->mLinkHolders = new LinkHolderArray( $this );
 199                 $this->mLinkID = 0;
 200                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 201                 $this->mVarCache = array();
 202
 203                 /**
 204                  * Prefix for temporary replacement strings for the multipass parser.
 205                  * \x07 should never appear in input as it's disallowed in XML.
 206                  * Using it at the front also gives us a little extra robustness
 207                  * since it shouldn't match when butted up against identifier-like
 208                  * string constructs.
 209                  *
 210                  * Must not consist of all title characters, or else it will change
 211                  * the behaviour of <nowiki> in a link.
 212                  */
 213                 # $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 214                 # Changed to \x7f to allow XML double-parsing -- TS
 215                 $this->mUniqPrefix = "\x7fUNIQ" . self::getRandomString();
 216
 217
 218                 # Clear these on every parse, bug 4549
 219                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 220
 221                 $this->mShowToc = true;
 222                 $this->mForceTocPosition = false;
 223                 $this->mIncludeSizes = array(
 224                         'post-expand' => 0,
 225                         'arg' => 0,
 226                 );
 227                 $this->mPPNodeCount = 0;
 228                 $this->mDefaultSort = false;
 229                 $this->mHeadings = array();
 230                 $this->mDoubleUnderscores = array();
 231                 $this->mExpensiveFunctionCount = 0;
 232
 233                 # Fix cloning
 234                 if ( isset( $this->mPreprocessor ) && $this->mPreprocessor->parser !== $this ) {
 235                         $this->mPreprocessor = null;
 236                 }
 237
 238                 wfRunHooks( 'ParserClearState', array( &$this ) );
 239                 wfProfileOut( __METHOD__ );
 240         }
 241
 242         function setOutputType( $ot ) {
 243                 $this->mOutputType = $ot;
 244                 # Shortcut alias
 245                 $this->ot = array(
 246                         'html' => $ot == self::OT_HTML,
 247                         'wiki' => $ot == self::OT_WIKI,
 248                         'pre' => $ot == self::OT_PREPROCESS,
 249                         'plain' => $ot == self::OT_PLAIN,
 250                 );
 251         }
 252
 253         /**
 254          * Set the context title
 255          */
 256         function setTitle( $t ) {
 257                 if ( !$t || $t instanceof FakeTitle ) {
 258                         $t = Title::newFromText( 'NO TITLE' );
 259                 }
 260
 261                 if ( strval( $t->getFragment() ) !== '' ) {
 262                         # Strip the fragment to avoid various odd effects
 263                         $this->mTitle = clone $t;
 264                         $this->mTitle->setFragment( '' );
 265                 } else {
 266                         $this->mTitle = $t;
 267                 }
 268         }
 269
 270         /**
 271          * Accessor for mUniqPrefix.
 272          *
 273          * @public
 274          */
 275         function uniqPrefix() {
 276                 if ( !isset( $this->mUniqPrefix ) ) {
 277                         # @todo Fixme: this is probably *horribly wrong*
 278                         # LanguageConverter seems to want $wgParser's uniqPrefix, however
 279                         # if this is called for a parser cache hit, the parser may not
 280                         # have ever been initialized in the first place.
 281                         # Not really sure what the heck is supposed to be going on here.
 282                         return '';
 283                         # throw new MWException( "Accessing uninitialized mUniqPrefix" );
 284                 }
 285                 return $this->mUniqPrefix;
 286         }
 287
 288         /**
 289          * Convert wikitext to HTML
 290          * Do not call this function recursively.
 291          *
 292          * @param $text String: text we want to parse
 293          * @param $title A title object
 294          * @param $options ParserOptions
 295          * @param $linestart boolean
 296          * @param $clearState boolean
 297          * @param $revid Int: number to pass in {{REVISIONID}}
 298          * @return ParserOutput a ParserOutput
 299          */
 300         public function parse( $text, Title $title, ParserOptions $options, $linestart = true, $clearState = true, $revid = null ) {
 301                 /**
 302                  * First pass--just handle <nowiki> sections, pass the rest off
 303                  * to internalParse() which does all the real work.
 304                  */
 305
 306                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang, $wgDisableLangConversion, $wgUser, $wgRequest, $wgDisableTitleConversion;
 307                 $fname = __METHOD__.'-' . wfGetCaller();
 308                 wfProfileIn( __METHOD__ );
 309                 wfProfileIn( $fname );
 310
 311                 if ( $clearState ) {
 312                         $this->clearState();
 313                 }
 314
 315                 $this->mOptions = $options;
 316                 $this->setTitle( $title ); # Page title has to be set for the pre-processor
 317
 318                 $oldRevisionId = $this->mRevisionId;
 319                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 320                 if ( $revid !== null ) {
 321                         $this->mRevisionId = $revid;
 322                         $this->mRevisionTimestamp = null;
 323                 }
 324                 $this->setOutputType( self::OT_HTML );
 325                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 326                 # No more strip!
 327                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 328                 $text = $this->internalParse( $text );
 329
 330                 $text = $this->mStripState->unstripGeneral( $text );
 331
 332                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 333                 $fixtags = array(
 334                         # french spaces, last one Guillemet-left
 335                         # only if there is something before the space
 336                         '/(.) (?=\\?|:|;|!|%|\\302\\273)/' => '\\1&nbsp;\\2',
 337                         # french spaces, Guillemet-right
 338                         '/(\\302\\253) /' => '\\1&nbsp;',
 339                         '/&nbsp;(!\s*important)/' => ' \\1', # Beware of CSS magic word !important, bug #11874.
 340                 );
 341                 $text = preg_replace( array_keys( $fixtags ), array_values( $fixtags ), $text );
 342
 343                 $text = $this->doBlockLevels( $text, $linestart );
 344
 345                 $this->replaceLinkHolders( $text );
 346
 347                 /**
 348                  * The page doesn't get language converted if
 349                  * a) It's disabled
 350                  * b) Content isn't converted
 351                  * c) It's a conversion table
 352                  */
 353                 if ( !( $wgDisableLangConversion
 354                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 355                                 || $this->mTitle->isConversionTable() ) ) {
 356
 357                         # The position of the convert() call should not be changed. it
 358                         # assumes that the links are all replaced and the only thing left
 359                         # is the <nowiki> mark.
 360
 361                         $text = $wgContLang->convert( $text );
 362                 }
 363
 364                 /**
 365                  * A page get its title converted except:
 366                  * a) Content convert is globally disabled
 367                  * b) Title convert is globally disabled
 368                  * c) The page is a redirect page
 369                  * d) User request with a "linkconvert" set to "no"
 370                  * e) A "nocontentconvert" magic word has been set
 371                  * f) A "notitleconvert" magic word has been set
 372                  * g) User sets "noconvertlink" in his/her preference
 373                  *
 374                  * Note that if a user tries to set a title in a conversion
 375                  * rule but content conversion was not done, then the parser
 376                  * won't pick it up.  This is probably expected behavior.
 377                  */
 378                 if ( !( $wgDisableContentConversion
 379                                 || $wgDisableTitleConversion
 380                                 || $wgRequest->getText( 'redirect', 'yes' ) == 'no'
 381                                 || $wgRequest->getText( 'linkconvert', 'yes' ) == 'no'
 382                                 || isset( $this->mDoubleUnderscores['nocontentconvert'] )
 383                                 || isset( $this->mDoubleUnderscores['notitleconvert'] )
 384                                 || $wgUser->getOption( 'noconvertlink' ) == 1 ) ) {
 385                         $convruletitle = $wgContLang->getConvRuleTitle();
 386                         if ( $convruletitle ) {
 387                                 $this->mOutput->setTitleText( $convruletitle );
 388                         }
 389                         else {
 390                                 $this->mOutput->setTitleText( $wgContLang->convert( $title->getPrefixedText() ) );
 391                         }
 392                 }
 393
 394                 $text = $this->mStripState->unstripNoWiki( $text );
 395
 396                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 397
 398 //!JF Move to its own function
 399
 400                 $uniq_prefix = $this->mUniqPrefix;
 401                 $matches = array();
 402                 $elements = array_keys( $this->mTransparentTagHooks );
 403                 $text = self::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 404
 405                 foreach ( $matches as $marker => $data ) {
 406                         list( $element, $content, $params, $tag ) = $data;
 407                         $tagName = strtolower( $element );
 408                         if ( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 409                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName], array( $content, $params, $this ) );
 410                         } else {
 411                                 $output = $tag;
 412                         }
 413                         $this->mStripState->general->setPair( $marker, $output );
 414                 }
 415                 $text = $this->mStripState->unstripGeneral( $text );
 416
 417                 $text = Sanitizer::normalizeCharReferences( $text );
 418
 419                 if ( ( $wgUseTidy && $this->mOptions->mTidy ) || $wgAlwaysUseTidy ) {
 420                         $text = MWTidy::tidy( $text );
 421                 } else {
 422                         # attempt to sanitize at least some nesting problems
 423                         # (bug #2702 and quite a few others)
 424                         $tidyregs = array(
 425                                 # ''Something [http://www.cool.com cool''] -->
 426                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 427                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 428                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 429                                 # fix up an anchor inside another anchor, only
 430                                 # at least for a single single nested link (bug 3695)
 431                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 432                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 433                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 434                                 # contains a div, so fix it up here; replace
 435                                 # div with escaped text
 436                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 437                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 438                                 # remove empty italic or bold tag pairs, some
 439                                 # introduced by rules above
 440                                 '/<([bi])><\/\\1>/' => '',
 441                         );
 442
 443                         $text = preg_replace(
 444                                 array_keys( $tidyregs ),
 445                                 array_values( $tidyregs ),
 446                                 $text );
 447                 }
 448                 global $wgExpensiveParserFunctionLimit;
 449                 if ( $this->mExpensiveFunctionCount > $wgExpensiveParserFunctionLimit ) {
 450                         $this->limitationWarn( 'expensive-parserfunction', $this->mExpensiveFunctionCount, $wgExpensiveParserFunctionLimit );
 451                 }
 452
 453                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 454
 455                 # Information on include size limits, for the benefit of users who try to skirt them
 456                 if ( $this->mOptions->getEnableLimitReport() ) {
 457                         $max = $this->mOptions->getMaxIncludeSize();
 458                         $PFreport = "Expensive parser function count: {$this->mExpensiveFunctionCount}/$wgExpensiveParserFunctionLimit\n";
 459                         $limitReport =
 460                                 "NewPP limit report\n" .
 461                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 462                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 463                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n".
 464                                 $PFreport;
 465                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 466                         $text .= "\n<!-- \n$limitReport-->\n";
 467                 }
 468                 $this->mOutput->setText( $text );
 469
 470                 $this->mRevisionId = $oldRevisionId;
 471                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 472                 wfProfileOut( $fname );
 473                 wfProfileOut( __METHOD__ );
 474
 475                 return $this->mOutput;
 476         }
 477
 478         /**
 479          * Recursive parser entry point that can be called from an extension tag
 480          * hook.
 481          *
 482          * If $frame is not provided, then template variables (e.g., {{{1}}}) within $text are not expanded
 483          *
 484          * @param $text String: text extension wants to have parsed
 485          * @param PPFrame $frame: The frame to use for expanding any template variables
 486          */
 487         function recursiveTagParse( $text, $frame=false ) {
 488                 wfProfileIn( __METHOD__ );
 489                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 490                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 491                 $text = $this->internalParse( $text, false, $frame );
 492                 wfProfileOut( __METHOD__ );
 493                 return $text;
 494         }
 495
 496         /**
 497          * Expand templates and variables in the text, producing valid, static wikitext.
 498          * Also removes comments.
 499          */
 500         function preprocess( $text, $title, $options, $revid = null ) {
 501                 wfProfileIn( __METHOD__ );
 502                 $this->clearState();
 503                 $this->setOutputType( self::OT_PREPROCESS );
 504                 $this->mOptions = $options;
 505                 $this->setTitle( $title );
 506                 if ( $revid !== null ) {
 507                         $this->mRevisionId = $revid;
 508                 }
 509                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 510                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 511                 $text = $this->replaceVariables( $text );
 512                 $text = $this->mStripState->unstripBoth( $text );
 513                 wfProfileOut( __METHOD__ );
 514                 return $text;
 515         }
 516
 517         /**
 518          * Process the wikitext for the ?preload= feature. (bug 5210)
 519          *
 520          * <noinclude>, <includeonly> etc. are parsed as for template transclusion,
 521          * comments, templates, arguments, tags hooks and parser functions are untouched.
 522          */
 523         public function getPreloadText( $text, $title, $options ) {
 524                 # Parser (re)initialisation
 525                 $this->clearState();
 526                 $this->setOutputType( self::OT_PLAIN );
 527                 $this->mOptions = $options;
 528                 $this->setTitle( $title );
 529
 530                 $flags = PPFrame::NO_ARGS | PPFrame::NO_TEMPLATES;
 531                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
 532                 return $this->getPreprocessor()->newFrame()->expand( $dom, $flags );
 533         }
 534
 535         /**
 536          * Get a random string
 537          *
 538          * @private
 539          * @static
 540          */
 541         function getRandomString() {
 542                 return dechex( mt_rand( 0, 0x7fffffff ) ) . dechex( mt_rand( 0, 0x7fffffff ) );
 543         }
 544
 545         function &getTitle() { return $this->mTitle; }
 546         function getOptions() { return $this->mOptions; }
 547         function getRevisionId() { return $this->mRevisionId; }
 548         function getOutput() { return $this->mOutput; }
 549         function nextLinkID() { return $this->mLinkID++; }
 550
 551         function getFunctionLang() {
 552                 global $wgLang, $wgContLang;
 553
 554                 $target = $this->mOptions->getTargetLanguage();
 555                 if ( $target !== null ) {
 556                         return $target;
 557                 } else {
 558                         return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 559                 }
 560         }
 561
 562         /**
 563          * Get a preprocessor object
 564          */
 565         function getPreprocessor() {
 566                 if ( !isset( $this->mPreprocessor ) ) {
 567                         $class = $this->mPreprocessorClass;
 568                         $this->mPreprocessor = new $class( $this );
 569                 }
 570                 return $this->mPreprocessor;
 571         }
 572
 573         /**
 574          * Replaces all occurrences of HTML-style comments and the given tags
 575          * in the text with a random marker and returns the next text. The output
 576          * parameter $matches will be an associative array filled with data in
 577          * the form:
 578          *   'UNIQ-xxxxx' => array(
 579          *     'element',
 580          *     'tag content',
 581          *     array( 'param' => 'x' ),
 582          *     '<element param="x">tag content</element>' ) )
 583          *
 584          * @param $elements list of element names. Comments are always extracted.
 585          * @param $text Source text string.
 586          * @param $uniq_prefix
 587          *
 588          * @public
 589          * @static
 590          */
 591         function extractTagsAndParams( $elements, $text, &$matches, $uniq_prefix = '' ) {
 592                 static $n = 1;
 593                 $stripped = '';
 594                 $matches = array();
 595
 596                 $taglist = implode( '|', $elements );
 597                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?" . ">)|<(!--)/i";
 598
 599                 while ( $text != '' ) {
 600                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 601                         $stripped .= $p[0];
 602                         if ( count( $p ) < 5 ) {
 603                                 break;
 604                         }
 605                         if ( count( $p ) > 5 ) {
 606                                 # comment
 607                                 $element    = $p[4];
 608                                 $attributes = '';
 609                                 $close      = '';
 610                                 $inside     = $p[5];
 611                         } else {
 612                                 # tag
 613                                 $element    = $p[1];
 614                                 $attributes = $p[2];
 615                                 $close      = $p[3];
 616                                 $inside     = $p[4];
 617                         }
 618
 619                         $marker = "$uniq_prefix-$element-" . sprintf( '%08X', $n++ ) . self::MARKER_SUFFIX;
 620                         $stripped .= $marker;
 621
 622                         if ( $close === '/>' ) {
 623                                 # Empty element tag, <tag />
 624                                 $content = null;
 625                                 $text = $inside;
 626                                 $tail = null;
 627                         } else {
 628                                 if ( $element === '!--' ) {
 629                                         $end = '/(-->)/';
 630                                 } else {
 631                                         $end = "/(<\\/$element\\s*>)/i";
 632                                 }
 633                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 634                                 $content = $q[0];
 635                                 if ( count( $q ) < 3 ) {
 636                                         # No end tag -- let it run out to the end of the text.
 637                                         $tail = '';
 638                                         $text = '';
 639                                 } else {
 640                                         $tail = $q[1];
 641                                         $text = $q[2];
 642                                 }
 643                         }
 644
 645                         $matches[$marker] = array( $element,
 646                                 $content,
 647                                 Sanitizer::decodeTagAttributes( $attributes ),
 648                                 "<$element$attributes$close$content$tail" );
 649                 }
 650                 return $stripped;
 651         }
 652
 653         /**
 654          * Get a list of strippable XML-like elements
 655          */
 656         function getStripList() {
 657                 return $this->mStripList;
 658         }
 659
 660         /**
 661          * @deprecated use replaceVariables
 662          */
 663         function strip( $text, $state, $stripcomments = false , $dontstrip = array() ) {
 664                 return $text;
 665         }
 666
 667         /**
 668          * Restores pre, math, and other extensions removed by strip()
 669          *
 670          * always call unstripNoWiki() after this one
 671          * @private
 672          * @deprecated use $this->mStripState->unstrip()
 673          */
 674         function unstrip( $text, $state ) {
 675                 return $state->unstripGeneral( $text );
 676         }
 677
 678         /**
 679          * Always call this after unstrip() to preserve the order
 680          *
 681          * @private
 682          * @deprecated use $this->mStripState->unstrip()
 683          */
 684         function unstripNoWiki( $text, $state ) {
 685                 return $state->unstripNoWiki( $text );
 686         }
 687
 688         /**
 689          * @deprecated use $this->mStripState->unstripBoth()
 690          */
 691         function unstripForHTML( $text ) {
 692                 return $this->mStripState->unstripBoth( $text );
 693         }
 694
 695         /**
 696          * Add an item to the strip state
 697          * Returns the unique tag which must be inserted into the stripped text
 698          * The tag will be replaced with the original text in unstrip()
 699          *
 700          * @private
 701          */
 702         function insertStripItem( $text ) {
 703                 $rnd = "{$this->mUniqPrefix}-item-{$this->mMarkerIndex}-" . self::MARKER_SUFFIX;
 704                 $this->mMarkerIndex++;
 705                 $this->mStripState->general->setPair( $rnd, $text );
 706                 return $rnd;
 707         }
 708
 709         /**
 710          * Interface with html tidy
 711          * @deprecated Use MWTidy::tidy()
 712          */
 713         public static function tidy( $text ) {
 714                 wfDeprecated( __METHOD__ );
 715                 return MWTidy::tidy( $text );
 716         }
 717
 718         /**
 719          * parse the wiki syntax used to render tables
 720          *
 721          * @private
 722          */
 723         function doTableStuff( $text ) {
 724                 wfProfileIn( __METHOD__ );
 725
 726                 $lines = StringUtils::explode( "\n", $text );
 727                 $out = '';
 728                 $td_history = array(); # Is currently a td tag open?
 729                 $last_tag_history = array(); # Save history of last lag activated (td, th or caption)
 730                 $tr_history = array(); # Is currently a tr tag open?
 731                 $tr_attributes = array(); # history of tr attributes
 732                 $has_opened_tr = array(); # Did this table open a <tr> element?
 733                 $indent_level = 0; # indent level of the table
 734
 735                 foreach ( $lines as $outLine ) {
 736                         $line = trim( $outLine );
 737
 738                         if ( $line == '' ) { # empty line, go to next line
 739                                 $out .= $outLine."\n";
 740                                 continue;
 741                         }
 742                         $first_character = $line[0];
 743                         $matches = array();
 744
 745                         if ( preg_match( '/^(:*)\{\|(.*)$/', $line , $matches ) ) {
 746                                 # First check if we are starting a new table
 747                                 $indent_level = strlen( $matches[1] );
 748
 749                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 750                                 $attributes = Sanitizer::fixTagAttributes( $attributes , 'table' );
 751
 752                                 $outLine = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 753                                 array_push( $td_history , false );
 754                                 array_push( $last_tag_history , '' );
 755                                 array_push( $tr_history , false );
 756                                 array_push( $tr_attributes , '' );
 757                                 array_push( $has_opened_tr , false );
 758                         } elseif ( count( $td_history ) == 0 ) {
 759                                 # Don't do any of the following
 760                                 $out .= $outLine."\n";
 761                                 continue;
 762                         } elseif ( substr( $line , 0 , 2 ) === '|}' ) {
 763                                 # We are ending a table
 764                                 $line = '</table>' . substr( $line , 2 );
 765                                 $last_tag = array_pop( $last_tag_history );
 766
 767                                 if ( !array_pop( $has_opened_tr ) ) {
 768                                         $line = "<tr><td></td></tr>{$line}";
 769                                 }
 770
 771                                 if ( array_pop( $tr_history ) ) {
 772                                         $line = "</tr>{$line}";
 773                                 }
 774
 775                                 if ( array_pop( $td_history ) ) {
 776                                         $line = "</{$last_tag}>{$line}";
 777                                 }
 778                                 array_pop( $tr_attributes );
 779                                 $outLine = $line . str_repeat( '</dd></dl>' , $indent_level );
 780                         } elseif ( substr( $line , 0 , 2 ) === '|-' ) {
 781                                 # Now we have a table row
 782                                 $line = preg_replace( '#^\|-+#', '', $line );
 783
 784                                 # Whats after the tag is now only attributes
 785                                 $attributes = $this->mStripState->unstripBoth( $line );
 786                                 $attributes = Sanitizer::fixTagAttributes( $attributes, 'tr' );
 787                                 array_pop( $tr_attributes );
 788                                 array_push( $tr_attributes, $attributes );
 789
 790                                 $line = '';
 791                                 $last_tag = array_pop( $last_tag_history );
 792                                 array_pop( $has_opened_tr );
 793                                 array_push( $has_opened_tr , true );
 794
 795                                 if ( array_pop( $tr_history ) ) {
 796                                         $line = '</tr>';
 797                                 }
 798
 799                                 if ( array_pop( $td_history ) ) {
 800                                         $line = "</{$last_tag}>{$line}";
 801                                 }
 802
 803                                 $outLine = $line;
 804                                 array_push( $tr_history , false );
 805                                 array_push( $td_history , false );
 806                                 array_push( $last_tag_history , '' );
 807                         } elseif ( $first_character === '|' || $first_character === '!' || substr( $line , 0 , 2 )  === '|+' ) {
 808                                 # This might be cell elements, td, th or captions
 809                                 if ( substr( $line , 0 , 2 ) === '|+' ) {
 810                                         $first_character = '+';
 811                                         $line = substr( $line , 1 );
 812                                 }
 813
 814                                 $line = substr( $line , 1 );
 815
 816                                 if ( $first_character === '!' ) {
 817                                         $line = str_replace( '!!' , '||' , $line );
 818                                 }
 819
 820                                 # Split up multiple cells on the same line.
 821                                 # FIXME : This can result in improper nesting of tags processed
 822                                 # by earlier parser steps, but should avoid splitting up eg
 823                                 # attribute values containing literal "||".
 824                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 825
 826                                 $outLine = '';
 827
 828                                 # Loop through each table cell
 829                                 foreach ( $cells as $cell ) {
 830                                         $previous = '';
 831                                         if ( $first_character !== '+' ) {
 832                                                 $tr_after = array_pop( $tr_attributes );
 833                                                 if ( !array_pop( $tr_history ) ) {
 834                                                         $previous = "<tr{$tr_after}>\n";
 835                                                 }
 836                                                 array_push( $tr_history , true );
 837                                                 array_push( $tr_attributes , '' );
 838                                                 array_pop( $has_opened_tr );
 839                                                 array_push( $has_opened_tr , true );
 840                                         }
 841
 842                                         $last_tag = array_pop( $last_tag_history );
 843
 844                                         if ( array_pop( $td_history ) ) {
 845                                                 $previous = "</{$last_tag}>{$previous}";
 846                                         }
 847
 848                                         if ( $first_character === '|' ) {
 849                                                 $last_tag = 'td';
 850                                         } elseif ( $first_character === '!' ) {
 851                                                 $last_tag = 'th';
 852                                         } elseif ( $first_character === '+' ) {
 853                                                 $last_tag = 'caption';
 854                                         } else {
 855                                                 $last_tag = '';
 856                                         }
 857
 858                                         array_push( $last_tag_history , $last_tag );
 859
 860                                         # A cell could contain both parameters and data
 861                                         $cell_data = explode( '|' , $cell , 2 );
 862
 863                                         # Bug 553: Note that a '|' inside an invalid link should not
 864                                         # be mistaken as delimiting cell parameters
 865                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 866                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 867                                         } elseif ( count( $cell_data ) == 1 ) {
 868                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 869                                         } else {
 870                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 871                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 872                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 873                                         }
 874
 875                                         $outLine .= $cell;
 876                                         array_push( $td_history , true );
 877                                 }
 878                         }
 879                         $out .= $outLine . "\n";
 880                 }
 881
 882                 # Closing open td, tr && table
 883                 while ( count( $td_history ) > 0 ) {
 884                         if ( array_pop( $td_history ) ) {
 885                                 $out .= "</td>\n";
 886                         }
 887                         if ( array_pop( $tr_history ) ) {
 888                                 $out .= "</tr>\n";
 889                         }
 890                         if ( !array_pop( $has_opened_tr ) ) {
 891                                 $out .= "<tr><td></td></tr>\n" ;
 892                         }
 893
 894                         $out .= "</table>\n";
 895                 }
 896
 897                 # Remove trailing line-ending (b/c)
 898                 if ( substr( $out, -1 ) === "\n" ) {
 899                         $out = substr( $out, 0, -1 );
 900                 }
 901
 902                 # special case: don't return empty table
 903                 if ( $out === "<table>\n<tr><td></td></tr>\n</table>" ) {
 904                         $out = '';
 905                 }
 906
 907                 wfProfileOut( __METHOD__ );
 908
 909                 return $out;
 910         }
 911
 912         /**
 913          * Helper function for parse() that transforms wiki markup into
 914          * HTML. Only called for $mOutputType == self::OT_HTML.
 915          *
 916          * @private
 917          */
 918         function internalParse( $text, $isMain = true, $frame=false ) {
 919                 wfProfileIn( __METHOD__ );
 920
 921                 $origText = $text;
 922
 923                 # Hook to suspend the parser in this state
 924                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 925                         wfProfileOut( __METHOD__ );
 926                         return $text ;
 927                 }
 928
 929                 # if $frame is provided, then use $frame for replacing any variables
 930                 if ( $frame ) {
 931                         # use frame depth to infer how include/noinclude tags should be handled
 932                         # depth=0 means this is the top-level document; otherwise it's an included document
 933                         if ( !$frame->depth ) {
 934                                 $flag = 0;
 935                         } else {
 936                                 $flag = Parser::PTD_FOR_INCLUSION;
 937                         $dom = $this->preprocessToDom( $text, $flag );
 938                         $text = $frame->expand( $dom );
 939                         }
 940                 } else {
 941                         # if $frame is not provided, then use old-style replaceVariables
 942                         $text = $this->replaceVariables( $text );
 943                 }
 944
 945                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 946                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 947
 948                 # Tables need to come after variable replacement for things to work
 949                 # properly; putting them before other transformations should keep
 950                 # exciting things like link expansions from showing up in surprising
 951                 # places.
 952                 $text = $this->doTableStuff( $text );
 953
 954                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 955
 956                 $text = $this->doDoubleUnderscore( $text );
 957
 958                 $text = $this->doHeadings( $text );
 959                 if ( $this->mOptions->getUseDynamicDates() ) {
 960                         $df = DateFormatter::getInstance();
 961                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 962                 }
 963                 $text = $this->doAllQuotes( $text );
 964                 $text = $this->replaceInternalLinks( $text );
 965                 $text = $this->replaceExternalLinks( $text );
 966
 967                 # replaceInternalLinks may sometimes leave behind
 968                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 969                 $text = str_replace( $this->mUniqPrefix.'NOPARSE', '', $text );
 970
 971                 $text = $this->doMagicLinks( $text );
 972                 $text = $this->formatHeadings( $text, $origText, $isMain );
 973
 974                 wfProfileOut( __METHOD__ );
 975                 return $text;
 976         }
 977
 978         /**
 979          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 980          * magic external links.
 981          *
 982          * DML
 983          * @private
 984          */
 985         function doMagicLinks( $text ) {
 986                 wfProfileIn( __METHOD__ );
 987                 $prots = $this->mUrlProtocols;
 988                 $urlChar = self::EXT_LINK_URL_CLASS;
 989                 $text = preg_replace_callback(
 990                         '!(?:                           # Start cases
 991                                 (<a[ \t\r\n>].*?</a>) |     # m[1]: Skip link text
 992                                 (<.*?>) |                   # m[2]: Skip stuff inside HTML elements' . "
 993                                 (\\b(?:$prots)$urlChar+) |  # m[3]: Free external links" . '
 994                                 (?:RFC|PMID)\s+([0-9]+) |   # m[4]: RFC or PMID, capture number
 995                                 ISBN\s+(\b                  # m[5]: ISBN, capture number
 996                                     (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 997                                     (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 998                                     [0-9Xx]                 # check digit
 999                                     \b)
1000                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1001                 wfProfileOut( __METHOD__ );
1002                 return $text;
1003         }
1004
1005         function magicLinkCallback( $m ) {
1006                 if ( isset( $m[1] ) && $m[1] !== '' ) {
1007                         # Skip anchor
1008                         return $m[0];
1009                 } elseif ( isset( $m[2] ) && $m[2] !== '' ) {
1010                         # Skip HTML element
1011                         return $m[0];
1012                 } elseif ( isset( $m[3] ) && $m[3] !== '' ) {
1013                         # Free external link
1014                         return $this->makeFreeExternalLink( $m[0] );
1015                 } elseif ( isset( $m[4] ) && $m[4] !== '' ) {
1016                         # RFC or PMID
1017                         $CssClass = '';
1018                         if ( substr( $m[0], 0, 3 ) === 'RFC' ) {
1019                                 $keyword = 'RFC';
1020                                 $urlmsg = 'rfcurl';
1021                                 $CssClass = 'mw-magiclink-rfc';
1022                                 $id = $m[4];
1023                         } elseif ( substr( $m[0], 0, 4 ) === 'PMID' ) {
1024                                 $keyword = 'PMID';
1025                                 $urlmsg = 'pubmedurl';
1026                                 $CssClass = 'mw-magiclink-pmid';
1027                                 $id = $m[4];
1028                         } else {
1029                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1030                                         substr( $m[0], 0, 20 ) . '"' );
1031                         }
1032                         $url = wfMsg( $urlmsg, $id);
1033                         $sk = $this->mOptions->getSkin();
1034                         $la = $sk->getExternalLinkAttributes( "external $CssClass" );
1035                         return "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1036                 } elseif ( isset( $m[5] ) && $m[5] !== '' ) {
1037                         # ISBN
1038                         $isbn = $m[5];
1039                         $num = strtr( $isbn, array(
1040                                 '-' => '',
1041                                 ' ' => '',
1042                                 'x' => 'X',
1043                         ));
1044                         $titleObj = SpecialPage::getTitleFor( 'Booksources', $num );
1045                         return'<a href="' .
1046                                 $titleObj->escapeLocalUrl() .
1047                                 "\" class=\"internal mw-magiclink-isbn\">ISBN $isbn</a>";
1048                 } else {
1049                         return $m[0];
1050                 }
1051         }
1052
1053         /**
1054          * Make a free external link, given a user-supplied URL
1055          * @return HTML
1056          * @private
1057          */
1058         function makeFreeExternalLink( $url ) {
1059                 global $wgContLang;
1060                 wfProfileIn( __METHOD__ );
1061
1062                 $sk = $this->mOptions->getSkin();
1063                 $trail = '';
1064
1065                 # The characters '<' and '>' (which were escaped by
1066                 # removeHTMLtags()) should not be included in
1067                 # URLs, per RFC 2396.
1068                 $m2 = array();
1069                 if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1070                         $trail = substr( $url, $m2[0][1] ) . $trail;
1071                         $url = substr( $url, 0, $m2[0][1] );
1072                 }
1073
1074                 # Move trailing punctuation to $trail
1075                 $sep = ',;\.:!?';
1076                 # If there is no left bracket, then consider right brackets fair game too
1077                 if ( strpos( $url, '(' ) === false ) {
1078                         $sep .= ')';
1079                 }
1080
1081                 $numSepChars = strspn( strrev( $url ), $sep );
1082                 if ( $numSepChars ) {
1083                         $trail = substr( $url, -$numSepChars ) . $trail;
1084                         $url = substr( $url, 0, -$numSepChars );
1085                 }
1086
1087                 $url = Sanitizer::cleanUrl( $url );
1088
1089                 # Is this an external image?
1090                 $text = $this->maybeMakeExternalImage( $url );
1091                 if ( $text === false ) {
1092                         # Not an image, make a link
1093                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free',
1094                                 $this->getExternalLinkAttribs( $url ) );
1095                         # Register it in the output object...
1096                         # Replace unnecessary URL escape codes with their equivalent characters
1097                         $pasteurized = self::replaceUnusualEscapes( $url );
1098                         $this->mOutput->addExternalLink( $pasteurized );
1099                 }
1100                 wfProfileOut( __METHOD__ );
1101                 return $text . $trail;
1102         }
1103
1104
1105         /**
1106          * Parse headers and return html
1107          *
1108          * @private
1109          */
1110         function doHeadings( $text ) {
1111                 wfProfileIn( __METHOD__ );
1112                 for ( $i = 6; $i >= 1; --$i ) {
1113                         $h = str_repeat( '=', $i );
1114                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1115                           "<h$i>\\1</h$i>", $text );
1116                 }
1117                 wfProfileOut( __METHOD__ );
1118                 return $text;
1119         }
1120
1121         /**
1122          * Replace single quotes with HTML markup
1123          * @private
1124          * @return string the altered text
1125          */
1126         function doAllQuotes( $text ) {
1127                 wfProfileIn( __METHOD__ );
1128                 $outtext = '';
1129                 $lines = StringUtils::explode( "\n", $text );
1130                 foreach ( $lines as $line ) {
1131                         $outtext .= $this->doQuotes( $line ) . "\n";
1132                 }
1133                 $outtext = substr( $outtext, 0,-1 );
1134                 wfProfileOut( __METHOD__ );
1135                 return $outtext;
1136         }
1137
1138         /**
1139          * Helper function for doAllQuotes()
1140          */
1141         public function doQuotes( $text ) {
1142                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1143                 if ( count( $arr ) == 1 ) {
1144                         return $text;
1145                 } else {
1146                         # First, do some preliminary work. This may shift some apostrophes from
1147                         # being mark-up to being text. It also counts the number of occurrences
1148                         # of bold and italics mark-ups.
1149                         $i = 0;
1150                         $numbold = 0;
1151                         $numitalics = 0;
1152                         foreach ( $arr as $r ) {
1153                                 if ( ( $i % 2 ) == 1 ) {
1154                                         # If there are ever four apostrophes, assume the first is supposed to
1155                                         # be text, and the remaining three constitute mark-up for bold text.
1156                                         if ( strlen( $arr[$i] ) == 4 ) {
1157                                                 $arr[$i-1] .= "'";
1158                                                 $arr[$i] = "'''";
1159                                         } elseif ( strlen( $arr[$i] ) > 5 ) {
1160                                                 # If there are more than 5 apostrophes in a row, assume they're all
1161                                                 # text except for the last 5.
1162                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1163                                                 $arr[$i] = "'''''";
1164                                         }
1165                                         # Count the number of occurrences of bold and italics mark-ups.
1166                                         # We are not counting sequences of five apostrophes.
1167                                         if ( strlen( $arr[$i] ) == 2 ) {
1168                                                 $numitalics++;
1169                                         } elseif ( strlen( $arr[$i] ) == 3 ) {
1170                                                 $numbold++;
1171                                         } elseif ( strlen( $arr[$i] ) == 5 ) {
1172                                                 $numitalics++;
1173                                                 $numbold++;
1174                                         }
1175                                 }
1176                                 $i++;
1177                         }
1178
1179                         # If there is an odd number of both bold and italics, it is likely
1180                         # that one of the bold ones was meant to be an apostrophe followed
1181                         # by italics. Which one we cannot know for certain, but it is more
1182                         # likely to be one that has a single-letter word before it.
1183                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) ) {
1184                                 $i = 0;
1185                                 $firstsingleletterword = -1;
1186                                 $firstmultiletterword = -1;
1187                                 $firstspace = -1;
1188                                 foreach ( $arr as $r ) {
1189                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) ) {
1190                                                 $x1 = substr( $arr[$i-1], -1 );
1191                                                 $x2 = substr( $arr[$i-1], -2, 1 );
1192                                                 if ( $x1 === ' ' ) {
1193                                                         if ( $firstspace == -1 ) {
1194                                                                 $firstspace = $i;
1195                                                         }
1196                                                 } elseif ( $x2 === ' ') {
1197                                                         if ( $firstsingleletterword == -1 ) {
1198                                                                 $firstsingleletterword = $i;
1199                                                         }
1200                                                 } else {
1201                                                         if ( $firstmultiletterword == -1 ) {
1202                                                                 $firstmultiletterword = $i;
1203                                                         }
1204                                                 }
1205                                         }
1206                                         $i++;
1207                                 }
1208
1209                                 # If there is a single-letter word, use it!
1210                                 if ( $firstsingleletterword > -1 ) {
1211                                         $arr[$firstsingleletterword] = "''";
1212                                         $arr[$firstsingleletterword-1] .= "'";
1213                                 } elseif ( $firstmultiletterword > -1 ) {
1214                                         # If not, but there's a multi-letter word, use that one.
1215                                         $arr[$firstmultiletterword] = "''";
1216                                         $arr[$firstmultiletterword-1] .= "'";
1217                                 } elseif ( $firstspace > -1 ) {
1218                                         # ... otherwise use the first one that has neither.
1219                                         # (notice that it is possible for all three to be -1 if, for example,
1220                                         # there is only one pentuple-apostrophe in the line)
1221                                         $arr[$firstspace] = "''";
1222                                         $arr[$firstspace-1] .= "'";
1223                                 }
1224                         }
1225
1226                         # Now let's actually convert our apostrophic mush to HTML!
1227                         $output = '';
1228                         $buffer = '';
1229                         $state = '';
1230                         $i = 0;
1231                         foreach ( $arr as $r ) {
1232                                 if ( ( $i % 2 ) == 0 ) {
1233                                         if ( $state === 'both' ) {
1234                                                 $buffer .= $r;
1235                                         } else {
1236                                                 $output .= $r;
1237                                         }
1238                                 } else {
1239                                         if ( strlen( $r ) == 2 ) {
1240                                                 if ( $state === 'i' ) {
1241                                                         $output .= '</i>'; $state = '';
1242                                                 } elseif ( $state === 'bi' ) {
1243                                                         $output .= '</i>'; $state = 'b';
1244                                                 } elseif ( $state === 'ib' ) {
1245                                                         $output .= '</b></i><b>'; $state = 'b';
1246                                                 } elseif ( $state === 'both' ) {
1247                                                         $output .= '<b><i>'.$buffer.'</i>'; $state = 'b';
1248                                                 } else { # $state can be 'b' or ''
1249                                                         $output .= '<i>'; $state .= 'i';
1250                                                 }
1251                                         } elseif ( strlen( $r ) == 3 ) {
1252                                                 if ( $state === 'b' ) {
1253                                                         $output .= '</b>'; $state = '';
1254                                                 } elseif ( $state === 'bi' ) {
1255                                                         $output .= '</i></b><i>'; $state = 'i';
1256                                                 } elseif ( $state === 'ib' ) {
1257                                                         $output .= '</b>'; $state = 'i';
1258                                                 } elseif ( $state === 'both' ) {
1259                                                         $output .= '<i><b>'.$buffer.'</b>'; $state = 'i';
1260                                                 } else { # $state can be 'i' or ''
1261                                                         $output .= '<b>'; $state .= 'b';
1262                                                 }
1263                                         } elseif ( strlen( $r ) == 5 ) {
1264                                                 if ( $state === 'b' ) {
1265                                                         $output .= '</b><i>'; $state = 'i';
1266                                                 } elseif ( $state === 'i' ) {
1267                                                         $output .= '</i><b>'; $state = 'b';
1268                                                 } elseif ( $state === 'bi' ) {
1269                                                         $output .= '</i></b>'; $state = '';
1270                                                 } elseif ( $state === 'ib' ) {
1271                                                         $output .= '</b></i>'; $state = '';
1272                                                 } elseif ( $state === 'both' ) {
1273                                                         $output .= '<i><b>'.$buffer.'</b></i>'; $state = '';
1274                                                 } else { # ($state == '')
1275                                                         $buffer = ''; $state = 'both';
1276                                                 }
1277                                         }
1278                                 }
1279                                 $i++;
1280                         }
1281                         # Now close all remaining tags.  Notice that the order is important.
1282                         if ( $state === 'b' || $state === 'ib' ) {
1283                                 $output .= '</b>';
1284                         }
1285                         if ( $state === 'i' || $state === 'bi' || $state === 'ib' ) {
1286                                 $output .= '</i>';
1287                         }
1288                         if ( $state === 'bi' ) {
1289                                 $output .= '</b>';
1290                         }
1291                         # There might be lonely ''''', so make sure we have a buffer
1292                         if ( $state === 'both' && $buffer ) {
1293                                 $output .= '<b><i>'.$buffer.'</i></b>';
1294                         }
1295                         return $output;
1296                 }
1297         }
1298
1299         /**
1300          * Replace external links (REL)
1301          *
1302          * Note: this is all very hackish and the order of execution matters a lot.
1303          * Make sure to run maintenance/parserTests.php if you change this code.
1304          *
1305          * @private
1306          */
1307         function replaceExternalLinks( $text ) {
1308                 global $wgContLang;
1309                 wfProfileIn( __METHOD__ );
1310
1311                 $sk = $this->mOptions->getSkin();
1312
1313                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1314                 $s = array_shift( $bits );
1315
1316                 $i = 0;
1317                 while ( $i<count( $bits ) ) {
1318                         $url = $bits[$i++];
1319                         $protocol = $bits[$i++];
1320                         $text = $bits[$i++];
1321                         $trail = $bits[$i++];
1322
1323                         # The characters '<' and '>' (which were escaped by
1324                         # removeHTMLtags()) should not be included in
1325                         # URLs, per RFC 2396.
1326                         $m2 = array();
1327                         if ( preg_match( '/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE ) ) {
1328                                 $text = substr( $url, $m2[0][1] ) . ' ' . $text;
1329                                 $url = substr( $url, 0, $m2[0][1] );
1330                         }
1331
1332                         # If the link text is an image URL, replace it with an <img> tag
1333                         # This happened by accident in the original parser, but some people used it extensively
1334                         $img = $this->maybeMakeExternalImage( $text );
1335                         if ( $img !== false ) {
1336                                 $text = $img;
1337                         }
1338
1339                         $dtrail = '';
1340
1341                         # Set linktype for CSS - if URL==text, link is essentially free
1342                         $linktype = ( $text === $url ) ? 'free' : 'text';
1343
1344                         # No link text, e.g. [http://domain.tld/some.link]
1345                         if ( $text == '' ) {
1346                                 # Autonumber if allowed. See bug #5918
1347                                 if ( strpos( wfUrlProtocols(), substr( $protocol, 0, strpos( $protocol, ':' ) ) ) !== false ) {
1348                                         $langObj = $this->getFunctionLang();
1349                                         $text = '[' . $langObj->formatNum( ++$this->mAutonumber ) . ']';
1350                                         $linktype = 'autonumber';
1351                                 } else {
1352                                         # Otherwise just use the URL
1353                                         $text = htmlspecialchars( $url );
1354                                         $linktype = 'free';
1355                                 }
1356                         } else {
1357                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1358                                 # Check for trail
1359                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1360                         }
1361
1362                         $text = $wgContLang->markNoConversion( $text );
1363
1364                         $url = Sanitizer::cleanUrl( $url );
1365
1366                         # Use the encoded URL
1367                         # This means that users can paste URLs directly into the text
1368                         # Funny characters like &ouml; aren't valid in URLs anyway
1369                         # This was changed in August 2004
1370                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype,
1371                                 $this->getExternalLinkAttribs( $url ) ) . $dtrail . $trail;
1372
1373                         # Register link in the output object.
1374                         # Replace unnecessary URL escape codes with the referenced character
1375                         # This prevents spammers from hiding links from the filters
1376                         $pasteurized = self::replaceUnusualEscapes( $url );
1377                         $this->mOutput->addExternalLink( $pasteurized );
1378                 }
1379
1380                 wfProfileOut( __METHOD__ );
1381                 return $s;
1382         }
1383
1384         /**
1385          * Get an associative array of additional HTML attributes appropriate for a
1386          * particular external link.  This currently may include rel => nofollow
1387          * (depending on configuration, namespace, and the URL's domain) and/or a
1388          * target attribute (depending on configuration).
1389          *
1390          * @param string $url Optional URL, to extract the domain from for rel =>
1391          *   nofollow if appropriate
1392          * @return array Associative array of HTML attributes
1393          */
1394         function getExternalLinkAttribs( $url = false ) {
1395                 $attribs = array();
1396                 global $wgNoFollowLinks, $wgNoFollowNsExceptions;
1397                 $ns = $this->mTitle->getNamespace();
1398                 if ( $wgNoFollowLinks && !in_array( $ns, $wgNoFollowNsExceptions ) ) {
1399                         $attribs['rel'] = 'nofollow';
1400
1401                         global $wgNoFollowDomainExceptions;
1402                         if ( $wgNoFollowDomainExceptions ) {
1403                                 $bits = wfParseUrl( $url );
1404                                 if ( is_array( $bits ) && isset( $bits['host'] ) ) {
1405                                         foreach ( $wgNoFollowDomainExceptions as $domain ) {
1406                                                 if ( substr( $bits['host'], -strlen( $domain ) ) == $domain ) {
1407                                                         unset( $attribs['rel'] );
1408                                                         break;
1409                                                 }
1410                                         }
1411                                 }
1412                         }
1413                 }
1414                 if ( $this->mOptions->getExternalLinkTarget() ) {
1415                         $attribs['target'] = $this->mOptions->getExternalLinkTarget();
1416                 }
1417                 return $attribs;
1418         }
1419
1420
1421         /**
1422          * Replace unusual URL escape codes with their equivalent characters
1423          * @param string
1424          * @return string
1425          * @static
1426          * @todo  This can merge genuinely required bits in the path or query string,
1427          *        breaking legit URLs. A proper fix would treat the various parts of
1428          *        the URL differently; as a workaround, just use the output for
1429          *        statistical records, not for actual linking/output.
1430          */
1431         static function replaceUnusualEscapes( $url ) {
1432                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1433                         array( __CLASS__, 'replaceUnusualEscapesCallback' ), $url );
1434         }
1435
1436         /**
1437          * Callback function used in replaceUnusualEscapes().
1438          * Replaces unusual URL escape codes with their equivalent character
1439          * @static
1440          * @private
1441          */
1442         private static function replaceUnusualEscapesCallback( $matches ) {
1443                 $char = urldecode( $matches[0] );
1444                 $ord = ord( $char );
1445                 # Is it an unsafe or HTTP reserved character according to RFC 1738?
1446                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1447                         # No, shouldn't be escaped
1448                         return $char;
1449                 } else {
1450                         # Yes, leave it escaped
1451                         return $matches[0];
1452                 }
1453         }
1454
1455         /**
1456          * make an image if it's allowed, either through the global
1457          * option, through the exception, or through the on-wiki whitelist
1458          * @private
1459          */
1460         function maybeMakeExternalImage( $url ) {
1461                 $sk = $this->mOptions->getSkin();
1462                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1463                 $imagesexception = !empty( $imagesfrom );
1464                 $text = false;
1465                 # $imagesfrom could be either a single string or an array of strings, parse out the latter
1466                 if ( $imagesexception && is_array( $imagesfrom ) ) {
1467                         $imagematch = false;
1468                         foreach ( $imagesfrom as $match ) {
1469                                 if ( strpos( $url, $match ) === 0 ) {
1470                                         $imagematch = true;
1471                                         break;
1472                                 }
1473                         }
1474                 } elseif ( $imagesexception ) {
1475                         $imagematch = ( strpos( $url, $imagesfrom ) === 0 );
1476                 } else {
1477                         $imagematch = false;
1478                 }
1479                 if ( $this->mOptions->getAllowExternalImages()
1480                      || ( $imagesexception && $imagematch ) ) {
1481                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1482                                 # Image found
1483                                 $text = $sk->makeExternalImage( $url );
1484                         }
1485                 }
1486                 if ( !$text && $this->mOptions->getEnableImageWhitelist()
1487                          && preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1488                         $whitelist = explode( "\n", wfMsgForContent( 'external_image_whitelist' ) );
1489                         foreach ( $whitelist as $entry ) {
1490                                 # Sanitize the regex fragment, make it case-insensitive, ignore blank entries/comments
1491                                 if ( strpos( $entry, '#' ) === 0 || $entry === '' ) {
1492                                         continue;
1493                                 }
1494                                 if ( preg_match( '/' . str_replace( '/', '\\/', $entry ) . '/i', $url ) ) {
1495                                         # Image matches a whitelist entry
1496                                         $text = $sk->makeExternalImage( $url );
1497                                         break;
1498                                 }
1499                         }
1500                 }
1501                 return $text;
1502         }
1503
1504         /**
1505          * Process [[ ]] wikilinks
1506          * @return processed text
1507          *
1508          * @private
1509          */
1510         function replaceInternalLinks( $s ) {
1511                 $this->mLinkHolders->merge( $this->replaceInternalLinks2( $s ) );
1512                 return $s;
1513         }
1514
1515         /**
1516          * Process [[ ]] wikilinks (RIL)
1517          * @return LinkHolderArray
1518          *
1519          * @private
1520          */
1521         function replaceInternalLinks2( &$s ) {
1522                 global $wgContLang;
1523
1524                 wfProfileIn( __METHOD__ );
1525
1526                 wfProfileIn( __METHOD__.'-setup' );
1527                 static $tc = FALSE, $e1, $e1_img;
1528                 # the % is needed to support urlencoded titles as well
1529                 if ( !$tc ) {
1530                         $tc = Title::legalChars() . '#%';
1531                         # Match a link having the form [[namespace:link|alternate]]trail
1532                         $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD";
1533                         # Match cases where there is no "]]", which might still be images
1534                         $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD";
1535                 }
1536
1537                 $sk = $this->mOptions->getSkin();
1538                 $holders = new LinkHolderArray( $this );
1539
1540                 # split the entire text string on occurences of [[
1541                 $a = StringUtils::explode( '[[', ' ' . $s );
1542                 # get the first element (all text up to first [[), and remove the space we added
1543                 $s = $a->current();
1544                 $a->next();
1545                 $line = $a->current(); # Workaround for broken ArrayIterator::next() that returns "void"
1546                 $s = substr( $s, 1 );
1547
1548                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1549                 $e2 = null;
1550                 if ( $useLinkPrefixExtension ) {
1551                         # Match the end of a line for a word that's not followed by whitespace,
1552                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1553                         $e2 = wfMsgForContent( 'linkprefix' );
1554                 }
1555
1556                 if ( is_null( $this->mTitle ) ) {
1557                         wfProfileOut( __METHOD__.'-setup' );
1558                         wfProfileOut( __METHOD__ );
1559                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1560                 }
1561                 $nottalk = !$this->mTitle->isTalkPage();
1562
1563                 if ( $useLinkPrefixExtension ) {
1564                         $m = array();
1565                         if ( preg_match( $e2, $s, $m ) ) {
1566                                 $first_prefix = $m[2];
1567                         } else {
1568                                 $first_prefix = false;
1569                         }
1570                 } else {
1571                         $prefix = '';
1572                 }
1573
1574                 if ( $wgContLang->hasVariants() ) {
1575                         $selflink = $wgContLang->convertLinkToAllVariants( $this->mTitle->getPrefixedText() );
1576                 } else {
1577                         $selflink = array( $this->mTitle->getPrefixedText() );
1578                 }
1579                 $useSubpages = $this->areSubpagesAllowed();
1580                 wfProfileOut( __METHOD__.'-setup' );
1581
1582                 # Loop for each link
1583                 for ( ; $line !== false && $line !== null ; $a->next(), $line = $a->current() ) {
1584                         # Check for excessive memory usage
1585                         if ( $holders->isBig() ) {
1586                                 # Too big
1587                                 # Do the existence check, replace the link holders and clear the array
1588                                 $holders->replace( $s );
1589                                 $holders->clear();
1590                         }
1591
1592                         if ( $useLinkPrefixExtension ) {
1593                                 wfProfileIn( __METHOD__.'-prefixhandling' );
1594                                 if ( preg_match( $e2, $s, $m ) ) {
1595                                         $prefix = $m[2];
1596                                         $s = $m[1];
1597                                 } else {
1598                                         $prefix='';
1599                                 }
1600                                 # first link
1601                                 if ( $first_prefix ) {
1602                                         $prefix = $first_prefix;
1603                                         $first_prefix = false;
1604                                 }
1605                                 wfProfileOut( __METHOD__.'-prefixhandling' );
1606                         }
1607
1608                         $might_be_img = false;
1609
1610                         wfProfileIn( __METHOD__."-e1" );
1611                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1612                                 $text = $m[2];
1613                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1614                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1615                                 # the real problem is with the $e1 regex
1616                                 # See bug 1300.
1617                                 #
1618                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1619                                 # and no image is in sight. See bug 2095.
1620                                 #
1621                                 if ( $text !== '' &&
1622                                         substr( $m[3], 0, 1 ) === ']' &&
1623                                         strpos( $text, '[' ) !== false
1624                                 )
1625                                 {
1626                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1627                                         $m[3] = substr( $m[3], 1 );
1628                                 }
1629                                 # fix up urlencoded title texts
1630                                 if ( strpos( $m[1], '%' ) !== false ) {
1631                                         # Should anchors '#' also be rejected?
1632                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode( $m[1] ) );
1633                                 }
1634                                 $trail = $m[3];
1635                         } elseif ( preg_match( $e1_img, $line, $m ) ) { # Invalid, but might be an image with a link in its caption
1636                                 $might_be_img = true;
1637                                 $text = $m[2];
1638                                 if ( strpos( $m[1], '%' ) !== false ) {
1639                                         $m[1] = urldecode( $m[1] );
1640                                 }
1641                                 $trail = "";
1642                         } else { # Invalid form; output directly
1643                                 $s .= $prefix . '[[' . $line ;
1644                                 wfProfileOut( __METHOD__."-e1" );
1645                                 continue;
1646                         }
1647                         wfProfileOut( __METHOD__."-e1" );
1648                         wfProfileIn( __METHOD__."-misc" );
1649
1650                         # Don't allow internal links to pages containing
1651                         # PROTO: where PROTO is a valid URL protocol; these
1652                         # should be external links.
1653                         if ( preg_match( '/^\b(?:' . wfUrlProtocols() . ')/', $m[1] ) ) {
1654                                 $s .= $prefix . '[[' . $line ;
1655                                 wfProfileOut( __METHOD__."-misc" );
1656                                 continue;
1657                         }
1658
1659                         # Make subpage if necessary
1660                         if ( $useSubpages ) {
1661                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1662                         } else {
1663                                 $link = $m[1];
1664                         }
1665
1666                         $noforce = ( substr( $m[1], 0, 1 ) !== ':' );
1667                         if ( !$noforce ) {
1668                                 # Strip off leading ':'
1669                                 $link = substr( $link, 1 );
1670                         }
1671
1672                         wfProfileOut( __METHOD__."-misc" );
1673                         wfProfileIn( __METHOD__."-title" );
1674                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki( $link ) );
1675                         if ( $nt === null ) {
1676                                 $s .= $prefix . '[[' . $line;
1677                                 wfProfileOut( __METHOD__."-title" );
1678                                 continue;
1679                         }
1680
1681                         $ns = $nt->getNamespace();
1682                         $iw = $nt->getInterWiki();
1683                         wfProfileOut( __METHOD__."-title" );
1684
1685                         if ( $might_be_img ) { # if this is actually an invalid link
1686                                 wfProfileIn( __METHOD__."-might_be_img" );
1687                                 if ( $ns == NS_FILE && $noforce ) { # but might be an image
1688                                         $found = false;
1689                                         while ( true ) {
1690                                                 # look at the next 'line' to see if we can close it there
1691                                                 $a->next();
1692                                                 $next_line = $a->current();
1693                                                 if ( $next_line === false || $next_line === null ) {
1694                                                         break;
1695                                                 }
1696                                                 $m = explode( ']]', $next_line, 3 );
1697                                                 if ( count( $m ) == 3 ) {
1698                                                         # the first ]] closes the inner link, the second the image
1699                                                         $found = true;
1700                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1701                                                         $trail = $m[2];
1702                                                         break;
1703                                                 } elseif ( count( $m ) == 2 ) {
1704                                                         # if there's exactly one ]] that's fine, we'll keep looking
1705                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1706                                                 } else {
1707                                                         # if $next_line is invalid too, we need look no further
1708                                                         $text .= '[[' . $next_line;
1709                                                         break;
1710                                                 }
1711                                         }
1712                                         if ( !$found ) {
1713                                                 # we couldn't find the end of this imageLink, so output it raw
1714                                                 # but don't ignore what might be perfectly normal links in the text we've examined
1715                                                 $holders->merge( $this->replaceInternalLinks2( $text ) );
1716                                                 $s .= "{$prefix}[[$link|$text";
1717                                                 # note: no $trail, because without an end, there *is* no trail
1718                                                 wfProfileOut( __METHOD__."-might_be_img" );
1719                                                 continue;
1720                                         }
1721                                 } else { # it's not an image, so output it raw
1722                                         $s .= "{$prefix}[[$link|$text";
1723                                         # note: no $trail, because without an end, there *is* no trail
1724                                         wfProfileOut( __METHOD__."-might_be_img" );
1725                                         continue;
1726                                 }
1727                                 wfProfileOut( __METHOD__."-might_be_img" );
1728                         }
1729
1730                         $wasblank = ( $text  == '' );
1731                         if ( $wasblank ) {
1732                                 $text = $link;
1733                         }
1734
1735                         # Link not escaped by : , create the various objects
1736                         if ( $noforce ) {
1737
1738                                 # Interwikis
1739                                 wfProfileIn( __METHOD__."-interwiki" );
1740                                 if ( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1741                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1742                                         $s = rtrim( $s . $prefix );
1743                                         $s .= trim( $trail, "\n" ) == '' ? '': $prefix . $trail;
1744                                         wfProfileOut( __METHOD__."-interwiki" );
1745                                         continue;
1746                                 }
1747                                 wfProfileOut( __METHOD__."-interwiki" );
1748
1749                                 if ( $ns == NS_FILE ) {
1750                                         wfProfileIn( __METHOD__."-image" );
1751                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1752                                                 if ( $wasblank ) {
1753                                                         # if no parameters were passed, $text
1754                                                         # becomes something like "File:Foo.png",
1755                                                         # which we don't want to pass on to the
1756                                                         # image generator
1757                                                         $text = '';
1758                                                 } else {
1759                                                         # recursively parse links inside the image caption
1760                                                         # actually, this will parse them in any other parameters, too,
1761                                                         # but it might be hard to fix that, and it doesn't matter ATM
1762                                                         $text = $this->replaceExternalLinks( $text );
1763                                                         $holders->merge( $this->replaceInternalLinks2( $text ) );
1764                                                 }
1765                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1766                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text, $holders ) ) . $trail;
1767                                         } else {
1768                                                 $s .= $prefix . $trail;
1769                                         }
1770                                         $this->mOutput->addImage( $nt->getDBkey() );
1771                                         wfProfileOut( __METHOD__."-image" );
1772                                         continue;
1773
1774                                 }
1775
1776                                 if ( $ns == NS_CATEGORY ) {
1777                                         wfProfileIn( __METHOD__."-category" );
1778                                         $s = rtrim( $s . "\n" ); # bug 87
1779
1780                                         if ( $wasblank ) {
1781                                                 $sortkey = $this->getDefaultSort();
1782                                         } else {
1783                                                 $sortkey = $text;
1784                                         }
1785                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1786                                         $sortkey = str_replace( "\n", '', $sortkey );
1787                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1788                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1789
1790                                         /**
1791                                          * Strip the whitespace Category links produce, see bug 87
1792                                          * @todo We might want to use trim($tmp, "\n") here.
1793                                          */
1794                                         $s .= trim( $prefix . $trail, "\n" ) == '' ? '': $prefix . $trail;
1795
1796                                         wfProfileOut( __METHOD__."-category" );
1797                                         continue;
1798                                 }
1799                         }
1800
1801                         # Self-link checking
1802                         if ( $nt->getFragment() === '' && $ns != NS_SPECIAL ) {
1803                                 if ( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1804                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1805                                         continue;
1806                                 }
1807                         }
1808
1809                         # NS_MEDIA is a pseudo-namespace for linking directly to a file
1810                         # FIXME: Should do batch file existence checks, see comment below
1811                         if ( $ns == NS_MEDIA ) {
1812                                 wfProfileIn( __METHOD__."-media" );
1813                                 # Give extensions a chance to select the file revision for us
1814                                 $skip = $time = false;
1815                                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$nt, &$skip, &$time ) );
1816                                 if ( $skip ) {
1817                                         $link = $sk->link( $nt );
1818                                 } else {
1819                                         $link = $sk->makeMediaLinkObj( $nt, $text, $time );
1820                                 }
1821                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1822                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1823                                 $this->mOutput->addImage( $nt->getDBkey() );
1824                                 wfProfileOut( __METHOD__."-media" );
1825                                 continue;
1826                         }
1827
1828                         wfProfileIn( __METHOD__."-always_known" );
1829                         # Some titles, such as valid special pages or files in foreign repos, should
1830                         # be shown as bluelinks even though they're not included in the page table
1831                         #
1832                         # FIXME: isAlwaysKnown() can be expensive for file links; we should really do
1833                         # batch file existence checks for NS_FILE and NS_MEDIA
1834                         if ( $iw == '' && $nt->isAlwaysKnown() ) {
1835                                 $this->mOutput->addLink( $nt );
1836                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1837                         } else {
1838                                 # Links will be added to the output link list after checking
1839                                 $s .= $holders->makeHolder( $nt, $text, '', $trail, $prefix );
1840                         }
1841                         wfProfileOut( __METHOD__."-always_known" );
1842                 }
1843                 wfProfileOut( __METHOD__ );
1844                 return $holders;
1845         }
1846
1847         /**
1848          * Make a link placeholder. The text returned can be later resolved to a real link with
1849          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1850          * parsing of interwiki links, and secondly to allow all existence checks and
1851          * article length checks (for stub links) to be bundled into a single query.
1852          *
1853          * @deprecated
1854          */
1855         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1856                 return $this->mLinkHolders->makeHolder( $nt, $text, $query, $trail, $prefix );
1857         }
1858
1859         /**
1860          * Render a forced-blue link inline; protect against double expansion of
1861          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1862          * Since this little disaster has to split off the trail text to avoid
1863          * breaking URLs in the following text without breaking trails on the
1864          * wiki links, it's been made into a horrible function.
1865          *
1866          * @param Title $nt
1867          * @param string $text
1868          * @param string $query
1869          * @param string $trail
1870          * @param string $prefix
1871          * @return string HTML-wikitext mix oh yuck
1872          */
1873         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1874                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1875                 $sk = $this->mOptions->getSkin();
1876                 # FIXME: use link() instead of deprecated makeKnownLinkObj()
1877                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1878                 return $this->armorLinks( $link ) . $trail;
1879         }
1880
1881         /**
1882          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1883          * going to go through further parsing steps before inline URL expansion.
1884          *
1885          * Not needed quite as much as it used to be since free links are a bit
1886          * more sensible these days. But bracketed links are still an issue.
1887          *
1888          * @param string more-or-less HTML
1889          * @return string less-or-more HTML with NOPARSE bits
1890          */
1891         function armorLinks( $text ) {
1892                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1893                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1894         }
1895
1896         /**
1897          * Return true if subpage links should be expanded on this page.
1898          * @return bool
1899          */
1900         function areSubpagesAllowed() {
1901                 # Some namespaces don't allow subpages
1902                 return MWNamespace::hasSubpages( $this->mTitle->getNamespace() );
1903         }
1904
1905         /**
1906          * Handle link to subpage if necessary
1907          * @param string $target the source of the link
1908          * @param string &$text the link text, modified as necessary
1909          * @return string the full name of the link
1910          * @private
1911          */
1912         function maybeDoSubpageLink( $target, &$text ) {
1913                 return Linker::normalizeSubpageLink( $this->mTitle, $target, $text );
1914         }
1915
1916         /**#@+
1917          * Used by doBlockLevels()
1918          * @private
1919          */
1920         function closeParagraph() {
1921                 $result = '';
1922                 if ( $this->mLastSection != '' ) {
1923                         $result = '</' . $this->mLastSection  . ">\n";
1924                 }
1925                 $this->mInPre = false;
1926                 $this->mLastSection = '';
1927                 return $result;
1928         }
1929         /**
1930          * getCommon() returns the length of the longest common substring
1931          * of both arguments, starting at the beginning of both.
1932          * @private
1933          */
1934         function getCommon( $st1, $st2 ) {
1935                 $fl = strlen( $st1 );
1936                 $shorter = strlen( $st2 );
1937                 if ( $fl < $shorter ) {
1938                         $shorter = $fl;
1939                 }
1940
1941                 for ( $i = 0; $i < $shorter; ++$i ) {
1942                         if ( $st1{$i} != $st2{$i} ) {
1943                                 break;
1944                         }
1945                 }
1946                 return $i;
1947         }
1948         /**
1949          * These next three functions open, continue, and close the list
1950          * element appropriate to the prefix character passed into them.
1951          * @private
1952          */
1953         function openList( $char ) {
1954                 $result = $this->closeParagraph();
1955
1956                 if ( '*' === $char ) {
1957                         $result .= '<ul><li>';
1958                 } elseif ( '#' === $char ) {
1959                         $result .= '<ol><li>';
1960                 } elseif ( ':' === $char ) {
1961                         $result .= '<dl><dd>';
1962                 } elseif ( ';' === $char ) {
1963                         $result .= '<dl><dt>';
1964                         $this->mDTopen = true;
1965                 } else {
1966                         $result = '<!-- ERR 1 -->';
1967                 }
1968
1969                 return $result;
1970         }
1971
1972         /**
1973          * TODO: document
1974          * @param $char String
1975          * @private
1976          */
1977         function nextItem( $char ) {
1978                 if ( '*' === $char || '#' === $char ) {
1979                         return '</li><li>';
1980                 } elseif ( ':' === $char || ';' === $char ) {
1981                         $close = '</dd>';
1982                         if ( $this->mDTopen ) {
1983                                 $close = '</dt>';
1984                         }
1985                         if ( ';' === $char ) {
1986                                 $this->mDTopen = true;
1987                                 return $close . '<dt>';
1988                         } else {
1989                                 $this->mDTopen = false;
1990                                 return $close . '<dd>';
1991                         }
1992                 }
1993                 return '<!-- ERR 2 -->';
1994         }
1995
1996         /**
1997          * TODO: document
1998          * @param $char String
1999          * @private
2000          */
2001         function closeList( $char ) {
2002                 if ( '*' === $char ) {
2003                         $text = '</li></ul>';
2004                 } elseif ( '#' === $char ) {
2005                         $text = '</li></ol>';
2006                 } elseif ( ':' === $char ) {
2007                         if ( $this->mDTopen ) {
2008                                 $this->mDTopen = false;
2009                                 $text = '</dt></dl>';
2010                         } else {
2011                                 $text = '</dd></dl>';
2012                         }
2013                 } else {
2014                         return '<!-- ERR 3 -->';
2015                 }
2016                 return $text."\n";
2017         }
2018         /**#@-*/
2019
2020         /**
2021          * Make lists from lines starting with ':', '*', '#', etc. (DBL)
2022          *
2023          * @param $linestart bool whether or not this is at the start of a line.
2024          * @private
2025          * @return string the lists rendered as HTML
2026          */
2027         function doBlockLevels( $text, $linestart ) {
2028                 wfProfileIn( __METHOD__ );
2029
2030                 # Parsing through the text line by line.  The main thing
2031                 # happening here is handling of block-level elements p, pre,
2032                 # and making lists from lines starting with * # : etc.
2033                 #
2034                 $textLines = StringUtils::explode( "\n", $text );
2035
2036                 $lastPrefix = $output = '';
2037                 $this->mDTopen = $inBlockElem = false;
2038                 $prefixLength = 0;
2039                 $paragraphStack = false;
2040
2041                 foreach ( $textLines as $oLine ) {
2042                         # Fix up $linestart
2043                         if ( !$linestart ) {
2044                                 $output .= $oLine;
2045                                 $linestart = true;
2046                                 continue;
2047                         }
2048                         # * = ul
2049                         # # = ol
2050                         # ; = dt
2051                         # : = dd
2052
2053                         $lastPrefixLength = strlen( $lastPrefix );
2054                         $preCloseMatch = preg_match( '/<\\/pre/i', $oLine );
2055                         $preOpenMatch = preg_match( '/<pre/i', $oLine );
2056                         # If not in a <pre> element, scan for and figure out what prefixes are there.
2057                         if ( !$this->mInPre ) {
2058                                 # Multiple prefixes may abut each other for nested lists.
2059                                 $prefixLength = strspn( $oLine, '*#:;' );
2060                                 $prefix = substr( $oLine, 0, $prefixLength );
2061
2062                                 # eh?
2063                                 # ; and : are both from definition-lists, so they're equivalent
2064                                 #  for the purposes of determining whether or not we need to open/close
2065                                 #  elements.
2066                                 $prefix2 = str_replace( ';', ':', $prefix );
2067                                 $t = substr( $oLine, $prefixLength );
2068                                 $this->mInPre = (bool)$preOpenMatch;
2069                         } else {
2070                                 # Don't interpret any other prefixes in preformatted text
2071                                 $prefixLength = 0;
2072                                 $prefix = $prefix2 = '';
2073                                 $t = $oLine;
2074                         }
2075
2076                         # List generation
2077                         if ( $prefixLength && $lastPrefix === $prefix2 ) {
2078                                 # Same as the last item, so no need to deal with nesting or opening stuff
2079                                 $output .= $this->nextItem( substr( $prefix, -1 ) );
2080                                 $paragraphStack = false;
2081
2082                                 if ( substr( $prefix, -1 ) === ';') {
2083                                         # The one nasty exception: definition lists work like this:
2084                                         # ; title : definition text
2085                                         # So we check for : in the remainder text to split up the
2086                                         # title and definition, without b0rking links.
2087                                         $term = $t2 = '';
2088                                         if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2089                                                 $t = $t2;
2090                                                 $output .= $term . $this->nextItem( ':' );
2091                                         }
2092                                 }
2093                         } elseif ( $prefixLength || $lastPrefixLength ) {
2094                                 # We need to open or close prefixes, or both.
2095
2096                                 # Either open or close a level...
2097                                 $commonPrefixLength = $this->getCommon( $prefix, $lastPrefix );
2098                                 $paragraphStack = false;
2099
2100                                 # Close all the prefixes which aren't shared.
2101                                 while ( $commonPrefixLength < $lastPrefixLength ) {
2102                                         $output .= $this->closeList( $lastPrefix[$lastPrefixLength-1] );
2103                                         --$lastPrefixLength;
2104                                 }
2105
2106                                 # Continue the current prefix if appropriate.
2107                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2108                                         $output .= $this->nextItem( $prefix[$commonPrefixLength-1] );
2109                                 }
2110
2111                                 # Open prefixes where appropriate.
2112                                 while ( $prefixLength > $commonPrefixLength ) {
2113                                         $char = substr( $prefix, $commonPrefixLength, 1 );
2114                                         $output .= $this->openList( $char );
2115
2116                                         if ( ';' === $char ) {
2117                                                 # FIXME: This is dupe of code above
2118                                                 if ( $this->findColonNoLinks( $t, $term, $t2 ) !== false ) {
2119                                                         $t = $t2;
2120                                                         $output .= $term . $this->nextItem( ':' );
2121                                                 }
2122                                         }
2123                                         ++$commonPrefixLength;
2124                                 }
2125                                 $lastPrefix = $prefix2;
2126                         }
2127
2128                         # If we have no prefixes, go to paragraph mode.
2129                         if ( 0 == $prefixLength ) {
2130                                 wfProfileIn( __METHOD__."-paragraph" );
2131                                 # No prefix (not in list)--go to paragraph mode
2132                                 # XXX: use a stack for nestable elements like span, table and div
2133                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2134                                 $closematch = preg_match(
2135                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2136                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2137                                 if ( $openmatch or $closematch ) {
2138                                         $paragraphStack = false;
2139                                         # TODO bug 5718: paragraph closed
2140                                         $output .= $this->closeParagraph();
2141                                         if ( $preOpenMatch and !$preCloseMatch ) {
2142                                                 $this->mInPre = true;
2143                                         }
2144                                         if ( $closematch ) {
2145                                                 $inBlockElem = false;
2146                                         } else {
2147                                                 $inBlockElem = true;
2148                                         }
2149                                 } elseif ( !$inBlockElem && !$this->mInPre ) {
2150                                         if ( ' ' == substr( $t, 0, 1 ) and ( $this->mLastSection === 'pre' || trim( $t ) != '' ) ) {
2151                                                 # pre
2152                                                 if ( $this->mLastSection !== 'pre' ) {
2153                                                         $paragraphStack = false;
2154                                                         $output .= $this->closeParagraph().'<pre>';
2155                                                         $this->mLastSection = 'pre';
2156                                                 }
2157                                                 $t = substr( $t, 1 );
2158                                         } else {
2159                                                 # paragraph
2160                                                 if ( trim( $t ) == '' ) {
2161                                                         if ( $paragraphStack ) {
2162                                                                 $output .= $paragraphStack.'<br />';
2163                                                                 $paragraphStack = false;
2164                                                                 $this->mLastSection = 'p';
2165                                                         } else {
2166                                                                 if ( $this->mLastSection !== 'p' ) {
2167                                                                         $output .= $this->closeParagraph();
2168                                                                         $this->mLastSection = '';
2169                                                                         $paragraphStack = '<p>';
2170                                                                 } else {
2171                                                                         $paragraphStack = '</p><p>';
2172                                                                 }
2173                                                         }
2174                                                 } else {
2175                                                         if ( $paragraphStack ) {
2176                                                                 $output .= $paragraphStack;
2177                                                                 $paragraphStack = false;
2178                                                                 $this->mLastSection = 'p';
2179                                                         } elseif ( $this->mLastSection !== 'p' ) {
2180                                                                 $output .= $this->closeParagraph().'<p>';
2181                                                                 $this->mLastSection = 'p';
2182                                                         }
2183                                                 }
2184                                         }
2185                                 }
2186                                 wfProfileOut( __METHOD__."-paragraph" );
2187                         }
2188                         # somewhere above we forget to get out of pre block (bug 785)
2189                         if ( $preCloseMatch && $this->mInPre ) {
2190                                 $this->mInPre = false;
2191                         }
2192                         if ( $paragraphStack === false ) {
2193                                 $output .= $t."\n";
2194                         }
2195                 }
2196                 while ( $prefixLength ) {
2197                         $output .= $this->closeList( $prefix2[$prefixLength-1] );
2198                         --$prefixLength;
2199                 }
2200                 if ( $this->mLastSection != '' ) {
2201                         $output .= '</' . $this->mLastSection . '>';
2202                         $this->mLastSection = '';
2203                 }
2204
2205                 wfProfileOut( __METHOD__ );
2206                 return $output;
2207         }
2208
2209         /**
2210          * Split up a string on ':', ignoring any occurences inside tags
2211          * to prevent illegal overlapping.
2212          * @param string $str the string to split
2213          * @param string &$before set to everything before the ':'
2214          * @param string &$after set to everything after the ':'
2215          * return string the position of the ':', or false if none found
2216          */
2217         function findColonNoLinks( $str, &$before, &$after ) {
2218                 wfProfileIn( __METHOD__ );
2219
2220                 $pos = strpos( $str, ':' );
2221                 if ( $pos === false ) {
2222                         # Nothing to find!
2223                         wfProfileOut( __METHOD__ );
2224                         return false;
2225                 }
2226
2227                 $lt = strpos( $str, '<' );
2228                 if ( $lt === false || $lt > $pos ) {
2229                         # Easy; no tag nesting to worry about
2230                         $before = substr( $str, 0, $pos );
2231                         $after = substr( $str, $pos+1 );
2232                         wfProfileOut( __METHOD__ );
2233                         return $pos;
2234                 }
2235
2236                 # Ugly state machine to walk through avoiding tags.
2237                 $state = self::COLON_STATE_TEXT;
2238                 $stack = 0;
2239                 $len = strlen( $str );
2240                 for( $i = 0; $i < $len; $i++ ) {
2241                         $c = $str{$i};
2242
2243                         switch( $state ) {
2244                         # (Using the number is a performance hack for common cases)
2245                         case 0: # self::COLON_STATE_TEXT:
2246                                 switch( $c ) {
2247                                 case "<":
2248                                         # Could be either a <start> tag or an </end> tag
2249                                         $state = self::COLON_STATE_TAGSTART;
2250                                         break;
2251                                 case ":":
2252                                         if ( $stack == 0 ) {
2253                                                 # We found it!
2254                                                 $before = substr( $str, 0, $i );
2255                                                 $after = substr( $str, $i + 1 );
2256                                                 wfProfileOut( __METHOD__ );
2257                                                 return $i;
2258                                         }
2259                                         # Embedded in a tag; don't break it.
2260                                         break;
2261                                 default:
2262                                         # Skip ahead looking for something interesting
2263                                         $colon = strpos( $str, ':', $i );
2264                                         if ( $colon === false ) {
2265                                                 # Nothing else interesting
2266                                                 wfProfileOut( __METHOD__ );
2267                                                 return false;
2268                                         }
2269                                         $lt = strpos( $str, '<', $i );
2270                                         if ( $stack === 0 ) {
2271                                                 if ( $lt === false || $colon < $lt ) {
2272                                                         # We found it!
2273                                                         $before = substr( $str, 0, $colon );
2274                                                         $after = substr( $str, $colon + 1 );
2275                                                         wfProfileOut( __METHOD__ );
2276                                                         return $i;
2277                                                 }
2278                                         }
2279                                         if ( $lt === false ) {
2280                                                 # Nothing else interesting to find; abort!
2281                                                 # We're nested, but there's no close tags left. Abort!
2282                                                 break 2;
2283                                         }
2284                                         # Skip ahead to next tag start
2285                                         $i = $lt;
2286                                         $state = self::COLON_STATE_TAGSTART;
2287                                 }
2288                                 break;
2289                         case 1: # self::COLON_STATE_TAG:
2290                                 # In a <tag>
2291                                 switch( $c ) {
2292                                 case ">":
2293                                         $stack++;
2294                                         $state = self::COLON_STATE_TEXT;
2295                                         break;
2296                                 case "/":
2297                                         # Slash may be followed by >?
2298                                         $state = self::COLON_STATE_TAGSLASH;
2299                                         break;
2300                                 default:
2301                                         # ignore
2302                                 }
2303                                 break;
2304                         case 2: # self::COLON_STATE_TAGSTART:
2305                                 switch( $c ) {
2306                                 case "/":
2307                                         $state = self::COLON_STATE_CLOSETAG;
2308                                         break;
2309                                 case "!":
2310                                         $state = self::COLON_STATE_COMMENT;
2311                                         break;
2312                                 case ">":
2313                                         # Illegal early close? This shouldn't happen D:
2314                                         $state = self::COLON_STATE_TEXT;
2315                                         break;
2316                                 default:
2317                                         $state = self::COLON_STATE_TAG;
2318                                 }
2319                                 break;
2320                         case 3: # self::COLON_STATE_CLOSETAG:
2321                                 # In a </tag>
2322                                 if ( $c === ">" ) {
2323                                         $stack--;
2324                                         if ( $stack < 0 ) {
2325                                                 wfDebug( __METHOD__.": Invalid input; too many close tags\n" );
2326                                                 wfProfileOut( __METHOD__ );
2327                                                 return false;
2328                                         }
2329                                         $state = self::COLON_STATE_TEXT;
2330                                 }
2331                                 break;
2332                         case self::COLON_STATE_TAGSLASH:
2333                                 if ( $c === ">" ) {
2334                                         # Yes, a self-closed tag <blah/>
2335                                         $state = self::COLON_STATE_TEXT;
2336                                 } else {
2337                                         # Probably we're jumping the gun, and this is an attribute
2338                                         $state = self::COLON_STATE_TAG;
2339                                 }
2340                                 break;
2341                         case 5: # self::COLON_STATE_COMMENT:
2342                                 if ( $c === "-" ) {
2343                                         $state = self::COLON_STATE_COMMENTDASH;
2344                                 }
2345                                 break;
2346                         case self::COLON_STATE_COMMENTDASH:
2347                                 if ( $c === "-" ) {
2348                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2349                                 } else {
2350                                         $state = self::COLON_STATE_COMMENT;
2351                                 }
2352                                 break;
2353                         case self::COLON_STATE_COMMENTDASHDASH:
2354                                 if ( $c === ">" ) {
2355                                         $state = self::COLON_STATE_TEXT;
2356                                 } else {
2357                                         $state = self::COLON_STATE_COMMENT;
2358                                 }
2359                                 break;
2360                         default:
2361                                 throw new MWException( "State machine error in " . __METHOD__ );
2362                         }
2363                 }
2364                 if ( $stack > 0 ) {
2365                         wfDebug( __METHOD__.": Invalid input; not enough close tags (stack $stack, state $state)\n" );
2366                         return false;
2367                 }
2368                 wfProfileOut( __METHOD__ );
2369                 return false;
2370         }
2371
2372         /**
2373          * Return value of a magic variable (like PAGENAME)
2374          *
2375          * @private
2376          */
2377         function getVariableValue( $index, $frame=false ) {
2378                 global $wgContLang, $wgSitename, $wgServer, $wgServerName;
2379                 global $wgScriptPath, $wgStylePath;
2380
2381                 /**
2382                  * Some of these require message or data lookups and can be
2383                  * expensive to check many times.
2384                  */
2385                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$this->mVarCache ) ) ) {
2386                         if ( isset( $this->mVarCache[$index] ) ) {
2387                                 return $this->mVarCache[$index];
2388                         }
2389                 }
2390
2391                 $ts = wfTimestamp( TS_UNIX, $this->mOptions->getTimestamp() );
2392                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2393
2394                 # Use the time zone
2395                 global $wgLocaltimezone;
2396                 if ( isset( $wgLocaltimezone ) ) {
2397                         $oldtz = date_default_timezone_get();
2398                         date_default_timezone_set( $wgLocaltimezone );
2399                 }
2400
2401                 $localTimestamp = date( 'YmdHis', $ts );
2402                 $localMonth = date( 'm', $ts );
2403                 $localMonth1 = date( 'n', $ts );
2404                 $localMonthName = date( 'n', $ts );
2405                 $localDay = date( 'j', $ts );
2406                 $localDay2 = date( 'd', $ts );
2407                 $localDayOfWeek = date( 'w', $ts );
2408                 $localWeek = date( 'W', $ts );
2409                 $localYear = date( 'Y', $ts );
2410                 $localHour = date( 'H', $ts );
2411                 if ( isset( $wgLocaltimezone ) ) {
2412                         date_default_timezone_set( $oldtz );
2413                 }
2414
2415                 switch ( $index ) {
2416                         case 'currentmonth':
2417                                 $value = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2418                                 break;
2419                         case 'currentmonth1':
2420                                 $value = $wgContLang->formatNum( gmdate( 'n', $ts ) );
2421                                 break;
2422                         case 'currentmonthname':
2423                                 $value = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2424                                 break;
2425                         case 'currentmonthnamegen':
2426                                 $value = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2427                                 break;
2428                         case 'currentmonthabbrev':
2429                                 $value = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2430                                 break;
2431                         case 'currentday':
2432                                 $value = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2433                                 break;
2434                         case 'currentday2':
2435                                 $value = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2436                                 break;
2437                         case 'localmonth':
2438                                 $value = $wgContLang->formatNum( $localMonth );
2439                                 break;
2440                         case 'localmonth1':
2441                                 $value = $wgContLang->formatNum( $localMonth1 );
2442                                 break;
2443                         case 'localmonthname':
2444                                 $value = $wgContLang->getMonthName( $localMonthName );
2445                                 break;
2446                         case 'localmonthnamegen':
2447                                 $value = $wgContLang->getMonthNameGen( $localMonthName );
2448                                 break;
2449                         case 'localmonthabbrev':
2450                                 $value = $wgContLang->getMonthAbbreviation( $localMonthName );
2451                                 break;
2452                         case 'localday':
2453                                 $value = $wgContLang->formatNum( $localDay );
2454                                 break;
2455                         case 'localday2':
2456                                 $value = $wgContLang->formatNum( $localDay2 );
2457                                 break;
2458                         case 'pagename':
2459                                 $value = wfEscapeWikiText( $this->mTitle->getText() );
2460                                 break;
2461                         case 'pagenamee':
2462                                 $value = $this->mTitle->getPartialURL();
2463                                 break;
2464                         case 'fullpagename':
2465                                 $value = wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2466                                 break;
2467                         case 'fullpagenamee':
2468                                 $value = $this->mTitle->getPrefixedURL();
2469                                 break;
2470                         case 'subpagename':
2471                                 $value = wfEscapeWikiText( $this->mTitle->getSubpageText() );
2472                                 break;
2473                         case 'subpagenamee':
2474                                 $value = $this->mTitle->getSubpageUrlForm();
2475                                 break;
2476                         case 'basepagename':
2477                                 $value = wfEscapeWikiText( $this->mTitle->getBaseText() );
2478                                 break;
2479                         case 'basepagenamee':
2480                                 $value = wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2481                                 break;
2482                         case 'talkpagename':
2483                                 if ( $this->mTitle->canTalk() ) {
2484                                         $talkPage = $this->mTitle->getTalkPage();
2485                                         $value = wfEscapeWikiText( $talkPage->getPrefixedText() );
2486                                 } else {
2487                                         $value = '';
2488                                 }
2489                                 break;
2490                         case 'talkpagenamee':
2491                                 if ( $this->mTitle->canTalk() ) {
2492                                         $talkPage = $this->mTitle->getTalkPage();
2493                                         $value = $talkPage->getPrefixedUrl();
2494                                 } else {
2495                                         $value = '';
2496                                 }
2497                                 break;
2498                         case 'subjectpagename':
2499                                 $subjPage = $this->mTitle->getSubjectPage();
2500                                 $value = wfEscapeWikiText( $subjPage->getPrefixedText() );
2501                                 break;
2502                         case 'subjectpagenamee':
2503                                 $subjPage = $this->mTitle->getSubjectPage();
2504                                 $value = $subjPage->getPrefixedUrl();
2505                                 break;
2506                         case 'revisionid':
2507                                 # Let the edit saving system know we should parse the page
2508                                 # *after* a revision ID has been assigned.
2509                                 $this->mOutput->setFlag( 'vary-revision' );
2510                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2511                                 $value = $this->mRevisionId;
2512                                 break;
2513                         case 'revisionday':
2514                                 # Let the edit saving system know we should parse the page
2515                                 # *after* a revision ID has been assigned. This is for null edits.
2516                                 $this->mOutput->setFlag( 'vary-revision' );
2517                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2518                                 $value = intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2519                                 break;
2520                         case 'revisionday2':
2521                                 # Let the edit saving system know we should parse the page
2522                                 # *after* a revision ID has been assigned. This is for null edits.
2523                                 $this->mOutput->setFlag( 'vary-revision' );
2524                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2525                                 $value = substr( $this->getRevisionTimestamp(), 6, 2 );
2526                                 break;
2527                         case 'revisionmonth':
2528                                 # Let the edit saving system know we should parse the page
2529                                 # *after* a revision ID has been assigned. This is for null edits.
2530                                 $this->mOutput->setFlag( 'vary-revision' );
2531                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2532                                 $value = intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2533                                 break;
2534                         case 'revisionyear':
2535                                 # Let the edit saving system know we should parse the page
2536                                 # *after* a revision ID has been assigned. This is for null edits.
2537                                 $this->mOutput->setFlag( 'vary-revision' );
2538                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2539                                 $value = substr( $this->getRevisionTimestamp(), 0, 4 );
2540                                 break;
2541                         case 'revisiontimestamp':
2542                                 # Let the edit saving system know we should parse the page
2543                                 # *after* a revision ID has been assigned. This is for null edits.
2544                                 $this->mOutput->setFlag( 'vary-revision' );
2545                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2546                                 $value = $this->getRevisionTimestamp();
2547                                 break;
2548                         case 'revisionuser':
2549                                 # Let the edit saving system know we should parse the page
2550                                 # *after* a revision ID has been assigned. This is for null edits.
2551                                 $this->mOutput->setFlag( 'vary-revision' );
2552                                 wfDebug( __METHOD__ . ": {{REVISIONUSER}} used, setting vary-revision...\n" );
2553                                 $value = $this->getRevisionUser();
2554                                 break;
2555                         case 'namespace':
2556                                 $value = str_replace( '_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2557                                 break;
2558                         case 'namespacee':
2559                                 $value = wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2560                                 break;
2561                         case 'talkspace':
2562                                 $value = $this->mTitle->canTalk() ? str_replace( '_',' ',$this->mTitle->getTalkNsText() ) : '';
2563                                 break;
2564                         case 'talkspacee':
2565                                 $value = $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2566                                 break;
2567                         case 'subjectspace':
2568                                 $value = $this->mTitle->getSubjectNsText();
2569                                 break;
2570                         case 'subjectspacee':
2571                                 $value = ( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2572                                 break;
2573                         case 'currentdayname':
2574                                 $value = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2575                                 break;
2576                         case 'currentyear':
2577                                 $value = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2578                                 break;
2579                         case 'currenttime':
2580                                 $value = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2581                                 break;
2582                         case 'currenthour':
2583                                 $value = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2584                                 break;
2585                         case 'currentweek':
2586                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2587                                 # int to remove the padding
2588                                 $value = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2589                                 break;
2590                         case 'currentdow':
2591                                 $value = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2592                                 break;
2593                         case 'localdayname':
2594                                 $value = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2595                                 break;
2596                         case 'localyear':
2597                                 $value = $wgContLang->formatNum( $localYear, true );
2598                                 break;
2599                         case 'localtime':
2600                                 $value = $wgContLang->time( $localTimestamp, false, false );
2601                                 break;
2602                         case 'localhour':
2603                                 $value = $wgContLang->formatNum( $localHour, true );
2604                                 break;
2605                         case 'localweek':
2606                                 # @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2607                                 # int to remove the padding
2608                                 $value = $wgContLang->formatNum( (int)$localWeek );
2609                                 break;
2610                         case 'localdow':
2611                                 $value = $wgContLang->formatNum( $localDayOfWeek );
2612                                 break;
2613                         case 'numberofarticles':
2614                                 $value = $wgContLang->formatNum( SiteStats::articles() );
2615                                 break;
2616                         case 'numberoffiles':
2617                                 $value = $wgContLang->formatNum( SiteStats::images() );
2618                                 break;
2619                         case 'numberofusers':
2620                                 $value = $wgContLang->formatNum( SiteStats::users() );
2621                                 break;
2622                         case 'numberofactiveusers':
2623                                 $value = $wgContLang->formatNum( SiteStats::activeUsers() );
2624                                 break;
2625                         case 'numberofpages':
2626                                 $value = $wgContLang->formatNum( SiteStats::pages() );
2627                                 break;
2628                         case 'numberofadmins':
2629                                 $value = $wgContLang->formatNum( SiteStats::numberingroup( 'sysop' ) );
2630                                 break;
2631                         case 'numberofedits':
2632                                 $value = $wgContLang->formatNum( SiteStats::edits() );
2633                                 break;
2634                         case 'numberofviews':
2635                                 $value = $wgContLang->formatNum( SiteStats::views() );
2636                                 break;
2637                         case 'currenttimestamp':
2638                                 $value = wfTimestamp( TS_MW, $ts );
2639                                 break;
2640                         case 'localtimestamp':
2641                                 $value = $localTimestamp;
2642                                 break;
2643                         case 'currentversion':
2644                                 $value = SpecialVersion::getVersion();
2645                                 break;
2646                         case 'sitename':
2647                                 return $wgSitename;
2648                         case 'server':
2649                                 return $wgServer;
2650                         case 'servername':
2651                                 return $wgServerName;
2652                         case 'scriptpath':
2653                                 return $wgScriptPath;
2654                         case 'stylepath':
2655                                 return $wgStylePath;
2656                         case 'directionmark':
2657                                 return $wgContLang->getDirMark();
2658                         case 'contentlanguage':
2659                                 global $wgContLanguageCode;
2660                                 return $wgContLanguageCode;
2661                         default:
2662                                 $ret = null;
2663                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$this->mVarCache, &$index, &$ret, &$frame ) ) ) {
2664                                         return $ret;
2665                                 } else {
2666                                         return null;
2667                                 }
2668                 }
2669
2670                 if ( $index )
2671                         $this->mVarCache[$index] = $value;
2672
2673                 return $value;
2674         }
2675
2676         /**
2677          * initialise the magic variables (like CURRENTMONTHNAME) and substitution modifiers
2678          *
2679          * @private
2680          */
2681         function initialiseVariables() {
2682                 wfProfileIn( __METHOD__ );
2683                 $variableIDs = MagicWord::getVariableIDs();
2684                 $substIDs = MagicWord::getSubstIDs();
2685
2686                 $this->mVariables = new MagicWordArray( $variableIDs );
2687                 $this->mSubstWords = new MagicWordArray( $substIDs );
2688                 wfProfileOut( __METHOD__ );
2689         }
2690
2691         /**
2692          * Preprocess some wikitext and return the document tree.
2693          * This is the ghost of replace_variables().
2694          *
2695          * @param string $text The text to parse
2696          * @param integer flags Bitwise combination of:
2697          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2698          *                                     included. Default is to assume a direct page view.
2699          *
2700          * The generated DOM tree must depend only on the input text and the flags.
2701          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2702          *
2703          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2704          * change in the DOM tree for a given text, must be passed through the section identifier
2705          * in the section edit link and thus back to extractSections().
2706          *
2707          * The output of this function is currently only cached in process memory, but a persistent
2708          * cache may be implemented at a later date which takes further advantage of these strict
2709          * dependency requirements.
2710          *
2711          * @private
2712          */
2713         function preprocessToDom( $text, $flags = 0 ) {
2714                 $dom = $this->getPreprocessor()->preprocessToObj( $text, $flags );
2715                 return $dom;
2716         }
2717
2718         /**
2719          * Return a three-element array: leading whitespace, string contents, trailing whitespace
2720          */
2721         public static function splitWhitespace( $s ) {
2722                 $ltrimmed = ltrim( $s );
2723                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
2724                 $trimmed = rtrim( $ltrimmed );
2725                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
2726                 if ( $diff > 0 ) {
2727                         $w2 = substr( $ltrimmed, -$diff );
2728                 } else {
2729                         $w2 = '';
2730                 }
2731                 return array( $w1, $trimmed, $w2 );
2732         }
2733
2734         /**
2735          * Replace magic variables, templates, and template arguments
2736          * with the appropriate text. Templates are substituted recursively,
2737          * taking care to avoid infinite loops.
2738          *
2739          * Note that the substitution depends on value of $mOutputType:
2740          *  self::OT_WIKI: only {{subst:}} templates
2741          *  self::OT_PREPROCESS: templates but not extension tags
2742          *  self::OT_HTML: all templates and extension tags
2743          *
2744          * @param string $tex The text to transform
2745          * @param PPFrame $frame Object describing the arguments passed to the template.
2746          *        Arguments may also be provided as an associative array, as was the usual case before MW1.12.
2747          *        Providing arguments this way may be useful for extensions wishing to perform variable replacement explicitly.
2748          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2749          * @private
2750          */
2751         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
2752                 # Is there any text? Also, Prevent too big inclusions!
2753                 if ( strlen( $text ) < 1 || strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2754                         return $text;
2755                 }
2756                 wfProfileIn( __METHOD__ );
2757
2758                 if ( $frame === false ) {
2759                         $frame = $this->getPreprocessor()->newFrame();
2760                 } elseif ( !( $frame instanceof PPFrame ) ) {
2761                         wfDebug( __METHOD__." called using plain parameters instead of a PPFrame instance. Creating custom frame.\n" );
2762                         $frame = $this->getPreprocessor()->newCustomFrame( $frame );
2763                 }
2764
2765                 $dom = $this->preprocessToDom( $text );
2766                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
2767                 $text = $frame->expand( $dom, $flags );
2768
2769                 wfProfileOut( __METHOD__ );
2770                 return $text;
2771         }
2772
2773         # Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2774         static function createAssocArgs( $args ) {
2775                 $assocArgs = array();
2776                 $index = 1;
2777                 foreach ( $args as $arg ) {
2778                         $eqpos = strpos( $arg, '=' );
2779                         if ( $eqpos === false ) {
2780                                 $assocArgs[$index++] = $arg;
2781                         } else {
2782                                 $name = trim( substr( $arg, 0, $eqpos ) );
2783                                 $value = trim( substr( $arg, $eqpos+1 ) );
2784                                 if ( $value === false ) {
2785                                         $value = '';
2786                                 }
2787                                 if ( $name !== false ) {
2788                                         $assocArgs[$name] = $value;
2789                                 }
2790                         }
2791                 }
2792
2793                 return $assocArgs;
2794         }
2795
2796         /**
2797          * Warn the user when a parser limitation is reached
2798          * Will warn at most once the user per limitation type
2799          *
2800          * @param string $limitationType, should be one of:
2801          *   'expensive-parserfunction' (corresponding messages:
2802          *       'expensive-parserfunction-warning',
2803          *       'expensive-parserfunction-category')
2804          *   'post-expand-template-argument' (corresponding messages:
2805          *       'post-expand-template-argument-warning',
2806          *       'post-expand-template-argument-category')
2807          *   'post-expand-template-inclusion' (corresponding messages:
2808          *       'post-expand-template-inclusion-warning',
2809          *       'post-expand-template-inclusion-category')
2810          * @params int $current, $max When an explicit limit has been
2811          *       exceeded, provide the values (optional)
2812          */
2813         function limitationWarn( $limitationType, $current=null, $max=null) {
2814                 # does no harm if $current and $max are present but are unnecessary for the message
2815                 $warning = wfMsgExt( "$limitationType-warning", array( 'parsemag', 'escape' ), $current, $max );
2816                 $this->mOutput->addWarning( $warning );
2817                 $this->addTrackingCategory( "$limitationType-category" );
2818         }
2819
2820         /**
2821          * Return the text of a template, after recursively
2822          * replacing any variables or templates within the template.
2823          *
2824          * @param array $piece The parts of the template
2825          *  $piece['title']: the title, i.e. the part before the |
2826          *  $piece['parts']: the parameter array
2827          *  $piece['lineStart']: whether the brace was at the start of a line
2828          * @param PPFrame The current frame, contains template arguments
2829          * @return string the text of the template
2830          * @private
2831          */
2832         function braceSubstitution( $piece, $frame ) {
2833                 global $wgContLang, $wgNonincludableNamespaces;
2834                 wfProfileIn( __METHOD__ );
2835                 wfProfileIn( __METHOD__.'-setup' );
2836
2837                 # Flags
2838                 $found = false;             # $text has been filled
2839                 $nowiki = false;            # wiki markup in $text should be escaped
2840                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2841                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2842                 $isChildObj = false;        # $text is a DOM node needing expansion in a child frame
2843                 $isLocalObj = false;        # $text is a DOM node needing expansion in the current frame
2844
2845                 # Title object, where $text came from
2846                 $title = null;
2847
2848                 # $part1 is the bit before the first |, and must contain only title characters.
2849                 # Various prefixes will be stripped from it later.
2850                 $titleWithSpaces = $frame->expand( $piece['title'] );
2851                 $part1 = trim( $titleWithSpaces );
2852                 $titleText = false;
2853
2854                 # Original title text preserved for various purposes
2855                 $originalTitle = $part1;
2856
2857                 # $args is a list of argument nodes, starting from index 0, not including $part1
2858                 $args = ( null == $piece['parts'] ) ? array() : $piece['parts'];
2859                 wfProfileOut( __METHOD__.'-setup' );
2860
2861                 # SUBST
2862                 wfProfileIn( __METHOD__.'-modifiers' );
2863                 if ( !$found ) {
2864
2865                         $substMatch = $this->mSubstWords->matchStartAndRemove( $part1 );
2866
2867                         # Possibilities for substMatch: "subst", "safesubst" or FALSE
2868                         # Decide whether to expand template or keep wikitext as-is.
2869                         if ( $this->ot['wiki'] ) {
2870                                 if ( $substMatch === false ) {
2871                                         $literal = true;  # literal when in PST with no prefix
2872                                 } else {
2873                                         $literal = false; # expand when in PST with subst: or safesubst:
2874                                 }
2875                         } else {
2876                                 if ( $substMatch == 'subst' ) {
2877                                         $literal = true;  # literal when not in PST with plain subst:
2878                                 } else {
2879                                         $literal = false; # expand when not in PST with safesubst: or no prefix
2880                                 }
2881                         }
2882                         if ( $literal ) {
2883                                 $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
2884                                 $isLocalObj = true;
2885                                 $found = true;
2886                         }
2887                 }
2888
2889                 # Variables
2890                 if ( !$found && $args->getLength() == 0 ) {
2891                         $id = $this->mVariables->matchStartToEnd( $part1 );
2892                         if ( $id !== false ) {
2893                                 $text = $this->getVariableValue( $id, $frame );
2894                                 if ( MagicWord::getCacheTTL( $id ) > -1 ) {
2895                                         $this->mOutput->mContainsOldMagic = true;
2896                                 }
2897                                 $found = true;
2898                         }
2899                 }
2900
2901                 # MSG, MSGNW and RAW
2902                 if ( !$found ) {
2903                         # Check for MSGNW:
2904                         $mwMsgnw = MagicWord::get( 'msgnw' );
2905                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2906                                 $nowiki = true;
2907                         } else {
2908                                 # Remove obsolete MSG:
2909                                 $mwMsg = MagicWord::get( 'msg' );
2910                                 $mwMsg->matchStartAndRemove( $part1 );
2911                         }
2912
2913                         # Check for RAW:
2914                         $mwRaw = MagicWord::get( 'raw' );
2915                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2916                                 $forceRawInterwiki = true;
2917                         }
2918                 }
2919                 wfProfileOut( __METHOD__.'-modifiers' );
2920
2921                 # Parser functions
2922                 if ( !$found ) {
2923                         wfProfileIn( __METHOD__ . '-pfunc' );
2924
2925                         $colonPos = strpos( $part1, ':' );
2926                         if ( $colonPos !== false ) {
2927                                 # Case sensitive functions
2928                                 $function = substr( $part1, 0, $colonPos );
2929                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2930                                         $function = $this->mFunctionSynonyms[1][$function];
2931                                 } else {
2932                                         # Case insensitive functions
2933                                         $function = $wgContLang->lc( $function );
2934                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2935                                                 $function = $this->mFunctionSynonyms[0][$function];
2936                                         } else {
2937                                                 $function = false;
2938                                         }
2939                                 }
2940                                 if ( $function ) {
2941                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
2942                                         $initialArgs = array( &$this );
2943                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
2944                                         if ( $flags & SFH_OBJECT_ARGS ) {
2945                                                 # Add a frame parameter, and pass the arguments as an array
2946                                                 $allArgs = $initialArgs;
2947                                                 $allArgs[] = $frame;
2948                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2949                                                         $funcArgs[] = $args->item( $i );
2950                                                 }
2951                                                 $allArgs[] = $funcArgs;
2952                                         } else {
2953                                                 # Convert arguments to plain text
2954                                                 for ( $i = 0; $i < $args->getLength(); $i++ ) {
2955                                                         $funcArgs[] = trim( $frame->expand( $args->item( $i ) ) );
2956                                                 }
2957                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
2958                                         }
2959
2960                                         # Workaround for PHP bug 35229 and similar
2961                                         if ( !is_callable( $callback ) ) {
2962                                                 wfProfileOut( __METHOD__ . '-pfunc' );
2963                                                 wfProfileOut( __METHOD__ );
2964                                                 throw new MWException( "Tag hook for $function is not callable\n" );
2965                                         }
2966                                         $result = call_user_func_array( $callback, $allArgs );
2967                                         $found = true;
2968                                         $noparse = true;
2969                                         $preprocessFlags = 0;
2970
2971                                         if ( is_array( $result ) ) {
2972                                                 if ( isset( $result[0] ) ) {
2973                                                         $text = $result[0];
2974                                                         unset( $result[0] );
2975                                                 }
2976
2977                                                 # Extract flags into the local scope
2978                                                 # This allows callers to set flags such as nowiki, found, etc.
2979                                                 extract( $result );
2980                                         } else {
2981                                                 $text = $result;
2982                                         }
2983                                         if ( !$noparse ) {
2984                                                 $text = $this->preprocessToDom( $text, $preprocessFlags );
2985                                                 $isChildObj = true;
2986                                         }
2987                                 }
2988                         }
2989                         wfProfileOut( __METHOD__ . '-pfunc' );
2990                 }
2991
2992                 # Finish mangling title and then check for loops.
2993                 # Set $title to a Title object and $titleText to the PDBK
2994                 if ( !$found ) {
2995                         $ns = NS_TEMPLATE;
2996                         # Split the title into page and subpage
2997                         $subpage = '';
2998                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
2999                         if ( $subpage !== '' ) {
3000                                 $ns = $this->mTitle->getNamespace();
3001                         }
3002                         $title = Title::newFromText( $part1, $ns );
3003                         if ( $title ) {
3004                                 $titleText = $title->getPrefixedText();
3005                                 # Check for language variants if the template is not found
3006                                 if ( $wgContLang->hasVariants() && $title->getArticleID() == 0 ) {
3007                                         $wgContLang->findVariantLink( $part1, $title, true );
3008                                 }
3009                                 # Do recursion depth check
3010                                 $limit = $this->mOptions->getMaxTemplateDepth();
3011                                 if ( $frame->depth >= $limit ) {
3012                                         $found = true;
3013                                         $text = '<span class="error">'
3014                                                 . wfMsgForContent( 'parser-template-recursion-depth-warning', $limit )
3015                                                 . '</span>';
3016                                 }
3017                         }
3018                 }
3019
3020                 # Load from database
3021                 if ( !$found && $title ) {
3022                         wfProfileIn( __METHOD__ . '-loadtpl' );
3023                         if ( !$title->isExternal() ) {
3024                                 if ( $title->getNamespace() == NS_SPECIAL
3025                                         && $this->mOptions->getAllowSpecialInclusion()
3026                                         && $this->ot['html'] )
3027                                 {
3028                                         $text = SpecialPage::capturePath( $title );
3029                                         if ( is_string( $text ) ) {
3030                                                 $found = true;
3031                                                 $isHTML = true;
3032                                                 $this->disableCache();
3033                                         }
3034                                 } elseif ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3035                                         $found = false; # access denied
3036                                         wfDebug( __METHOD__.": template inclusion denied for " . $title->getPrefixedDBkey() );
3037                                 } else {
3038                                         list( $text, $title ) = $this->getTemplateDom( $title );
3039                                         if ( $text !== false ) {
3040                                                 $found = true;
3041                                                 $isChildObj = true;
3042                                         }
3043                                 }
3044
3045                                 # If the title is valid but undisplayable, make a link to it
3046                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3047                                         $text = "[[:$titleText]]";
3048                                         $found = true;
3049                                 }
3050                         } elseif ( $title->isTrans() ) {
3051                                 # Interwiki transclusion
3052                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3053                                         $text = $this->interwikiTransclude( $title, 'render' );
3054                                         $isHTML = true;
3055                                 } else {
3056                                         $text = $this->interwikiTransclude( $title, 'raw' );
3057                                         # Preprocess it like a template
3058                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3059                                         $isChildObj = true;
3060                                 }
3061                                 $found = true;
3062                         }
3063
3064                         # Do infinite loop check
3065                         # This has to be done after redirect resolution to avoid infinite loops via redirects
3066                         if ( !$frame->loopCheck( $title ) ) {
3067                                 $found = true;
3068                                 $text = '<span class="error">' . wfMsgForContent( 'parser-template-loop-warning', $titleText ) . '</span>';
3069                                 wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
3070                         }
3071                         wfProfileOut( __METHOD__ . '-loadtpl' );
3072                 }
3073
3074                 # If we haven't found text to substitute by now, we're done
3075                 # Recover the source wikitext and return it
3076                 if ( !$found ) {
3077                         $text = $frame->virtualBracketedImplode( '{{', '|', '}}', $titleWithSpaces, $args );
3078                         wfProfileOut( __METHOD__ );
3079                         return array( 'object' => $text );
3080                 }
3081
3082                 # Expand DOM-style return values in a child frame
3083                 if ( $isChildObj ) {
3084                         # Clean up argument array
3085                         $newFrame = $frame->newChild( $args, $title );
3086
3087                         if ( $nowiki ) {
3088                                 $text = $newFrame->expand( $text, PPFrame::RECOVER_ORIG );
3089                         } elseif ( $titleText !== false && $newFrame->isEmpty() ) {
3090                                 # Expansion is eligible for the empty-frame cache
3091                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3092                                         $text = $this->mTplExpandCache[$titleText];
3093                                 } else {
3094                                         $text = $newFrame->expand( $text );
3095                                         $this->mTplExpandCache[$titleText] = $text;
3096                                 }
3097                         } else {
3098                                 # Uncached expansion
3099                                 $text = $newFrame->expand( $text );
3100                         }
3101                 }
3102                 if ( $isLocalObj && $nowiki ) {
3103                         $text = $frame->expand( $text, PPFrame::RECOVER_ORIG );
3104                         $isLocalObj = false;
3105                 }
3106
3107                 # Replace raw HTML by a placeholder
3108                 # Add a blank line preceding, to prevent it from mucking up
3109                 # immediately preceding headings
3110                 if ( $isHTML ) {
3111                         $text = "\n\n" . $this->insertStripItem( $text );
3112                 } elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3113                         # Escape nowiki-style return values
3114                         $text = wfEscapeWikiText( $text );
3115                 } elseif ( is_string( $text )
3116                         && !$piece['lineStart']
3117                         && preg_match( '/^(?:{\\||:|;|#|\*)/', $text ) )
3118                 {
3119                         # Bug 529: if the template begins with a table or block-level
3120                         # element, it should be treated as beginning a new line.
3121                         # This behaviour is somewhat controversial.
3122                         $text = "\n" . $text;
3123                 }
3124
3125                 if ( is_string( $text ) && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3126                         # Error, oversize inclusion
3127                         $text = "[[$originalTitle]]" .
3128                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3129                         $this->limitationWarn( 'post-expand-template-inclusion' );
3130                 }
3131
3132                 if ( $isLocalObj ) {
3133                         $ret = array( 'object' => $text );
3134                 } else {
3135                         $ret = array( 'text' => $text );
3136                 }
3137
3138                 wfProfileOut( __METHOD__ );
3139                 return $ret;
3140         }
3141
3142         /**
3143          * Get the semi-parsed DOM representation of a template with a given title,
3144          * and its redirect destination title. Cached.
3145          */
3146         function getTemplateDom( $title ) {
3147                 $cacheTitle = $title;
3148                 $titleText = $title->getPrefixedDBkey();
3149
3150                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3151                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3152                         $title = Title::makeTitle( $ns, $dbk );
3153                         $titleText = $title->getPrefixedDBkey();
3154                 }
3155                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3156                         return array( $this->mTplDomCache[$titleText], $title );
3157                 }
3158
3159                 # Cache miss, go to the database
3160                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3161
3162                 if ( $text === false ) {
3163                         $this->mTplDomCache[$titleText] = false;
3164                         return array( false, $title );
3165                 }
3166
3167                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3168                 $this->mTplDomCache[ $titleText ] = $dom;
3169
3170                 if ( !$title->equals( $cacheTitle ) ) {
3171                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3172                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3173                 }
3174
3175                 return array( $dom, $title );
3176         }
3177
3178         /**
3179          * Fetch the unparsed text of a template and register a reference to it.
3180          */
3181         function fetchTemplateAndTitle( $title ) {
3182                 $templateCb = $this->mOptions->getTemplateCallback();
3183                 $stuff = call_user_func( $templateCb, $title, $this );
3184                 $text = $stuff['text'];
3185                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3186                 if ( isset( $stuff['deps'] ) ) {
3187                         foreach ( $stuff['deps'] as $dep ) {
3188                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3189                         }
3190                 }
3191                 return array( $text, $finalTitle );
3192         }
3193
3194         function fetchTemplate( $title ) {
3195                 $rv = $this->fetchTemplateAndTitle( $title );
3196                 return $rv[0];
3197         }
3198
3199         /**
3200          * Static function to get a template
3201          * Can be overridden via ParserOptions::setTemplateCallback().
3202          */
3203         static function statelessFetchTemplate( $title, $parser=false ) {
3204                 $text = $skip = false;
3205                 $finalTitle = $title;
3206                 $deps = array();
3207
3208                 # Loop to fetch the article, with up to 1 redirect
3209                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3210                         # Give extensions a chance to select the revision instead
3211                         $id = false; # Assume current
3212                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( $parser, &$title, &$skip, &$id ) );
3213
3214                         if ( $skip ) {
3215                                 $text = false;
3216                                 $deps[] = array(
3217                                         'title' => $title,
3218                                         'page_id' => $title->getArticleID(),
3219                                         'rev_id' => null );
3220                                 break;
3221                         }
3222                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3223                         $rev_id = $rev ? $rev->getId() : 0;
3224                         # If there is no current revision, there is no page
3225                         if ( $id === false && !$rev ) {
3226                                 $linkCache = LinkCache::singleton();
3227                                 $linkCache->addBadLinkObj( $title );
3228                         }
3229
3230                         $deps[] = array(
3231                                 'title' => $title,
3232                                 'page_id' => $title->getArticleID(),
3233                                 'rev_id' => $rev_id );
3234
3235                         if ( $rev ) {
3236                                 $text = $rev->getText();
3237                         } elseif ( $title->getNamespace() == NS_MEDIAWIKI ) {
3238                                 global $wgContLang;
3239                                 $message = $wgContLang->lcfirst( $title->getText() );
3240                                 $text = wfMsgForContentNoTrans( $message );
3241                                 if ( wfEmptyMsg( $message, $text ) ) {
3242                                         $text = false;
3243                                         break;
3244                                 }
3245                         } else {
3246                                 break;
3247                         }
3248                         if ( $text === false ) {
3249                                 break;
3250                         }
3251                         # Redirect?
3252                         $finalTitle = $title;
3253                         $title = Title::newFromRedirect( $text );
3254                 }
3255                 return array(
3256                         'text' => $text,
3257                         'finalTitle' => $finalTitle,
3258                         'deps' => $deps );
3259         }
3260
3261         /**
3262          * Transclude an interwiki link.
3263          */
3264         function interwikiTransclude( $title, $action ) {
3265                 global $wgEnableScaryTranscluding;
3266
3267                 if ( !$wgEnableScaryTranscluding ) {
3268                         return wfMsg('scarytranscludedisabled');
3269                 }
3270
3271                 $url = $title->getFullUrl( "action=$action" );
3272
3273                 if ( strlen( $url ) > 255 ) {
3274                         return wfMsg( 'scarytranscludetoolong' );
3275                 }
3276                 return $this->fetchScaryTemplateMaybeFromCache( $url );
3277         }
3278
3279         function fetchScaryTemplateMaybeFromCache( $url ) {
3280                 global $wgTranscludeCacheExpiry;
3281                 $dbr = wfGetDB( DB_SLAVE );
3282                 $tsCond = $dbr->timestamp( time() - $wgTranscludeCacheExpiry );
3283                 $obj = $dbr->selectRow( 'transcache', array('tc_time', 'tc_contents' ),
3284                                 array( 'tc_url' => $url, "tc_time >= " . $dbr->addQuotes( $tsCond ) ) );
3285                 if ( $obj ) {
3286                         return $obj->tc_contents;
3287                 }
3288
3289                 $text = Http::get( $url );
3290                 if ( !$text ) {
3291                         return wfMsg( 'scarytranscludefailed', $url );
3292                 }
3293
3294                 $dbw = wfGetDB( DB_MASTER );
3295                 $dbw->replace( 'transcache', array('tc_url'), array(
3296                         'tc_url' => $url,
3297                         'tc_time' => $dbw->timestamp( time() ),
3298                         'tc_contents' => $text)
3299                 );
3300                 return $text;
3301         }
3302
3303
3304         /**
3305          * Triple brace replacement -- used for template arguments
3306          * @private
3307          */
3308         function argSubstitution( $piece, $frame ) {
3309                 wfProfileIn( __METHOD__ );
3310
3311                 $error = false;
3312                 $parts = $piece['parts'];
3313                 $nameWithSpaces = $frame->expand( $piece['title'] );
3314                 $argName = trim( $nameWithSpaces );
3315                 $object = false;
3316                 $text = $frame->getArgument( $argName );
3317                 if (  $text === false && $parts->getLength() > 0
3318                   && (
3319                     $this->ot['html']
3320                     || $this->ot['pre']
3321                     || ( $this->ot['wiki'] && $frame->isTemplate() )
3322                   )
3323                 ) {
3324                         # No match in frame, use the supplied default
3325                         $object = $parts->item( 0 )->getChildren();
3326                 }
3327                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3328                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3329                         $this->limitationWarn( 'post-expand-template-argument' );
3330                 }
3331
3332                 if ( $text === false && $object === false ) {
3333                         # No match anywhere
3334                         $object = $frame->virtualBracketedImplode( '{{{', '|', '}}}', $nameWithSpaces, $parts );
3335                 }
3336                 if ( $error !== false ) {
3337                         $text .= $error;
3338                 }
3339                 if ( $object !== false ) {
3340                         $ret = array( 'object' => $object );
3341                 } else {
3342                         $ret = array( 'text' => $text );
3343                 }
3344
3345                 wfProfileOut( __METHOD__ );
3346                 return $ret;
3347         }
3348
3349         /**
3350          * Return the text to be used for a given extension tag.
3351          * This is the ghost of strip().
3352          *
3353          * @param array $params Associative array of parameters:
3354          *     name       PPNode for the tag name
3355          *     attr       PPNode for unparsed text where tag attributes are thought to be
3356          *     attributes Optional associative array of parsed attributes
3357          *     inner      Contents of extension element
3358          *     noClose    Original text did not have a close tag
3359          * @param PPFrame $frame
3360          */
3361         function extensionSubstitution( $params, $frame ) {
3362                 global $wgRawHtml, $wgContLang;
3363
3364                 $name = $frame->expand( $params['name'] );
3365                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3366                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3367                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf( '%08X', $this->mMarkerIndex++ ) . self::MARKER_SUFFIX;
3368
3369                 $isFunctionTag = isset( $this->mFunctionTagHooks[strtolower($name)] ) &&
3370                         ( $this->ot['html'] || $this->ot['pre'] );
3371                 if ( $isFunctionTag ) {
3372                         $markerType = 'none';
3373                 } else {
3374                         $markerType = 'general';
3375                 }
3376                 if ( $this->ot['html'] || $isFunctionTag ) {
3377                         $name = strtolower( $name );
3378                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3379                         if ( isset( $params['attributes'] ) ) {
3380                                 $attributes = $attributes + $params['attributes'];
3381                         }
3382
3383                         if ( isset( $this->mTagHooks[$name] ) ) {
3384                                 # Workaround for PHP bug 35229 and similar
3385                                 if ( !is_callable( $this->mTagHooks[$name] ) ) {
3386                                         throw new MWException( "Tag hook for $name is not callable\n" );
3387                                 }
3388                                 $output = call_user_func_array( $this->mTagHooks[$name],
3389                                         array( $content, $attributes, $this, $frame ) );
3390                         } elseif ( isset( $this->mFunctionTagHooks[$name] ) ) {
3391                                 list( $callback, $flags ) = $this->mFunctionTagHooks[$name];
3392                                 if ( !is_callable( $callback ) ) {
3393                                         throw new MWException( "Tag hook for $name is not callable\n" );
3394                                 }
3395
3396                                 $output = call_user_func_array( $callback, array( &$this, $frame, $content, $attributes ) );
3397                         } else {
3398                                 $output = '<span class="error">Invalid tag extension name: ' .
3399                                         htmlspecialchars( $name ) . '</span>';
3400                         }
3401
3402                         if ( is_array( $output ) ) {
3403                                 # Extract flags to local scope (to override $markerType)
3404                                 $flags = $output;
3405                                 $output = $flags[0];
3406                                 unset( $flags[0] );
3407                                 extract( $flags );
3408                         }
3409                 } else {
3410                         if ( is_null( $attrText ) ) {
3411                                 $attrText = '';
3412                         }
3413                         if ( isset( $params['attributes'] ) ) {
3414                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3415                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3416                                                 htmlspecialchars( $attrValue ) . '"';
3417                                 }
3418                         }
3419                         if ( $content === null ) {
3420                                 $output = "<$name$attrText/>";
3421                         } else {
3422                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3423                                 $output = "<$name$attrText>$content$close";
3424                         }
3425                 }
3426
3427                 if ( $markerType === 'none' ) {
3428                         return $output;
3429                 } elseif ( $markerType === 'nowiki' ) {
3430                         $this->mStripState->nowiki->setPair( $marker, $output );
3431                 } elseif ( $markerType === 'general' ) {
3432                         $this->mStripState->general->setPair( $marker, $output );
3433                 } else {
3434                         throw new MWException( __METHOD__.': invalid marker type' );
3435                 }
3436                 return $marker;
3437         }
3438
3439         /**
3440          * Increment an include size counter
3441          *
3442          * @param string $type The type of expansion
3443          * @param integer $size The size of the text
3444          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3445          */
3446         function incrementIncludeSize( $type, $size ) {
3447                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3448                         return false;
3449                 } else {
3450                         $this->mIncludeSizes[$type] += $size;
3451                         return true;
3452                 }
3453         }
3454
3455         /**
3456          * Increment the expensive function count
3457          *
3458          * @return boolean False if the limit has been exceeded
3459          */
3460         function incrementExpensiveFunctionCount() {
3461                 global $wgExpensiveParserFunctionLimit;
3462                 $this->mExpensiveFunctionCount++;
3463                 if ( $this->mExpensiveFunctionCount <= $wgExpensiveParserFunctionLimit ) {
3464                         return true;
3465                 }
3466                 return false;
3467         }
3468
3469         /**
3470          * Strip double-underscore items like __NOGALLERY__ and __NOTOC__
3471          * Fills $this->mDoubleUnderscores, returns the modified text
3472          */
3473         function doDoubleUnderscore( $text ) {
3474                 wfProfileIn( __METHOD__ );
3475
3476                 # The position of __TOC__ needs to be recorded
3477                 $mw = MagicWord::get( 'toc' );
3478                 if ( $mw->match( $text ) ) {
3479                         $this->mShowToc = true;
3480                         $this->mForceTocPosition = true;
3481
3482                         # Set a placeholder. At the end we'll fill it in with the TOC.
3483                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3484
3485                         # Only keep the first one.
3486                         $text = $mw->replace( '', $text );
3487                 }
3488
3489                 # Now match and remove the rest of them
3490                 $mwa = MagicWord::getDoubleUnderscoreArray();
3491                 $this->mDoubleUnderscores = $mwa->matchAndRemove( $text );
3492
3493                 if ( isset( $this->mDoubleUnderscores['nogallery'] ) ) {
3494                         $this->mOutput->mNoGallery = true;
3495                 }
3496                 if ( isset( $this->mDoubleUnderscores['notoc'] ) && !$this->mForceTocPosition ) {
3497                         $this->mShowToc = false;
3498                 }
3499                 if ( isset( $this->mDoubleUnderscores['hiddencat'] ) && $this->mTitle->getNamespace() == NS_CATEGORY ) {
3500                         $this->mOutput->setProperty( 'hiddencat', 'y' );
3501                         $this->addTrackingCategory( 'hidden-category-category' );
3502                 }
3503                 # (bug 8068) Allow control over whether robots index a page.
3504                 #
3505                 # FIXME (bug 14899): __INDEX__ always overrides __NOINDEX__ here!  This
3506                 # is not desirable, the last one on the page should win.
3507                 if ( isset( $this->mDoubleUnderscores['noindex'] ) && $this->mTitle->canUseNoindex() ) {
3508                         $this->mOutput->setIndexPolicy( 'noindex' );
3509                         $this->addTrackingCategory( 'noindex-category' );
3510                 }
3511                 if ( isset( $this->mDoubleUnderscores['index'] ) && $this->mTitle->canUseNoindex() ) {
3512                         $this->mOutput->setIndexPolicy( 'index' );
3513                         $this->addTrackingCategory( 'index-category' );
3514                 }
3515
3516                 wfProfileOut( __METHOD__ );
3517                 return $text;
3518         }
3519
3520         /**
3521          * Add a tracking category, getting the title from a system message,
3522          * or print a debug message if the title is invalid.
3523          * @param $msg String message key
3524          * @return Bool whether the addition was successful
3525          */
3526         protected function addTrackingCategory( $msg ) {
3527                 $cat = wfMsgForContent( $msg );
3528
3529                 # Allow tracking categories to be disabled by setting them to "-"
3530                 if ( $cat === '-' ) {
3531                         return false;
3532                 }
3533
3534                 $containerCategory = Title::makeTitleSafe( NS_CATEGORY, $cat );
3535                 if ( $containerCategory ) {
3536                         $this->mOutput->addCategory( $containerCategory->getDBkey(), $this->getDefaultSort() );
3537                         return true;
3538                 } else {
3539                         wfDebug( __METHOD__.": [[MediaWiki:$msg]] is not a valid title!\n" );
3540                         return false;
3541                 }
3542         }
3543
3544         /**
3545          * This function accomplishes several tasks:
3546          * 1) Auto-number headings if that option is enabled
3547          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3548          * 3) Add a Table of contents on the top for users who have enabled the option
3549          * 4) Auto-anchor headings
3550          *
3551          * It loops through all headlines, collects the necessary data, then splits up the
3552          * string and re-inserts the newly formatted headlines.
3553          *
3554          * @param string $text
3555          * @param string $origText Original, untouched wikitext
3556          * @param boolean $isMain
3557          * @private
3558          */
3559         function formatHeadings( $text, $origText, $isMain=true ) {
3560                 global $wgMaxTocLevel, $wgContLang, $wgHtml5, $wgExperimentalHtmlIds;
3561
3562                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3563                 $showEditLink = $this->mOptions->getEditSection();
3564
3565                 # Do not call quickUserCan unless necessary
3566                 if ( $showEditLink && !$this->mTitle->quickUserCan( 'edit' ) ) {
3567                         $showEditLink = 0;
3568                 }
3569
3570                 # Inhibit editsection links if requested in the page
3571                 if ( isset( $this->mDoubleUnderscores['noeditsection'] )  || $this->mOptions->getIsPrintable() ) {
3572                         $showEditLink = 0;
3573                 }
3574
3575                 # Get all headlines for numbering them and adding funky stuff like [edit]
3576                 # links - this is for later, but we need the number of headlines right now
3577                 $matches = array();
3578                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3579
3580                 # if there are fewer than 4 headlines in the article, do not show TOC
3581                 # unless it's been explicitly enabled.
3582                 $enoughToc = $this->mShowToc &&
3583                         ( ( $numMatches >= 4 ) || $this->mForceTocPosition );
3584
3585                 # Allow user to stipulate that a page should have a "new section"
3586                 # link added via __NEWSECTIONLINK__
3587                 if ( isset( $this->mDoubleUnderscores['newsectionlink'] ) ) {
3588                         $this->mOutput->setNewSection( true );
3589                 }
3590
3591                 # Allow user to remove the "new section"
3592                 # link via __NONEWSECTIONLINK__
3593                 if ( isset( $this->mDoubleUnderscores['nonewsectionlink'] ) ) {
3594                         $this->mOutput->hideNewSection( true );
3595                 }
3596
3597                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3598                 # override above conditions and always show TOC above first header
3599                 if ( isset( $this->mDoubleUnderscores['forcetoc'] ) ) {
3600                         $this->mShowToc = true;
3601                         $enoughToc = true;
3602                 }
3603
3604                 # We need this to perform operations on the HTML
3605                 $sk = $this->mOptions->getSkin();
3606
3607                 # headline counter
3608                 $headlineCount = 0;
3609                 $numVisible = 0;
3610
3611                 # Ugh .. the TOC should have neat indentation levels which can be
3612                 # passed to the skin functions. These are determined here
3613                 $toc = '';
3614                 $full = '';
3615                 $head = array();
3616                 $sublevelCount = array();
3617                 $levelCount = array();
3618                 $toclevel = 0;
3619                 $level = 0;
3620                 $prevlevel = 0;
3621                 $toclevel = 0;
3622                 $prevtoclevel = 0;
3623                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-" . self::MARKER_SUFFIX;
3624                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3625                 $oldType = $this->mOutputType;
3626                 $this->setOutputType( self::OT_WIKI );
3627                 $frame = $this->getPreprocessor()->newFrame();
3628                 $root = $this->preprocessToDom( $origText );
3629                 $node = $root->getFirstChild();
3630                 $byteOffset = 0;
3631                 $tocraw = array();
3632
3633                 foreach ( $matches[3] as $headline ) {
3634                         $isTemplate = false;
3635                         $titleText = false;
3636                         $sectionIndex = false;
3637                         $numbering = '';
3638                         $markerMatches = array();
3639                         if ( preg_match("/^$markerRegex/", $headline, $markerMatches ) ) {
3640                                 $serial = $markerMatches[1];
3641                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3642                                 $isTemplate = ( $titleText != $baseTitleText );
3643                                 $headline = preg_replace( "/^$markerRegex/", "", $headline );
3644                         }
3645
3646                         if ( $toclevel ) {
3647                                 $prevlevel = $level;
3648                                 $prevtoclevel = $toclevel;
3649                         }
3650                         $level = $matches[1][$headlineCount];
3651
3652                         if ( $level > $prevlevel ) {
3653                                 # Increase TOC level
3654                                 $toclevel++;
3655                                 $sublevelCount[$toclevel] = 0;
3656                                 if ( $toclevel<$wgMaxTocLevel ) {
3657                                         $prevtoclevel = $toclevel;
3658                                         $toc .= $sk->tocIndent();
3659                                         $numVisible++;
3660                                 }
3661                         } elseif ( $level < $prevlevel && $toclevel > 1 ) {
3662                                 # Decrease TOC level, find level to jump to
3663
3664                                 for ( $i = $toclevel; $i > 0; $i-- ) {
3665                                         if ( $levelCount[$i] == $level ) {
3666                                                 # Found last matching level
3667                                                 $toclevel = $i;
3668                                                 break;
3669                                         } elseif ( $levelCount[$i] < $level ) {
3670                                                 # Found first matching level below current level
3671                                                 $toclevel = $i + 1;
3672                                                 break;
3673                                         }
3674                                 }
3675                                 if ( $i == 0 ) {
3676                                         $toclevel = 1;
3677                                 }
3678                                 if ( $toclevel<$wgMaxTocLevel ) {
3679                                         if ( $prevtoclevel < $wgMaxTocLevel ) {
3680                                                 # Unindent only if the previous toc level was shown :p
3681                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3682                                                 $prevtoclevel = $toclevel;
3683                                         } else {
3684                                                 $toc .= $sk->tocLineEnd();
3685                                         }
3686                                 }
3687                         } else {
3688                                 # No change in level, end TOC line
3689                                 if ( $toclevel<$wgMaxTocLevel ) {
3690                                         $toc .= $sk->tocLineEnd();
3691                                 }
3692                         }
3693
3694                         $levelCount[$toclevel] = $level;
3695
3696                         # count number of headlines for each level
3697                         @$sublevelCount[$toclevel]++;
3698                         $dot = 0;
3699                         for( $i = 1; $i <= $toclevel; $i++ ) {
3700                                 if ( !empty( $sublevelCount[$i] ) ) {
3701                                         if ( $dot ) {
3702                                                 $numbering .= '.';
3703                                         }
3704                                         $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3705                                         $dot = 1;
3706                                 }
3707                         }
3708
3709                         # The safe header is a version of the header text safe to use for links
3710                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3711                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3712
3713                         # Remove link placeholders by the link text.
3714                         #     <!--LINK number-->
3715                         # turns into
3716                         #     link text with suffix
3717                         $safeHeadline = $this->replaceLinkHoldersText( $safeHeadline );
3718
3719                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3720                         $tocline = preg_replace(
3721                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3722                                 array( '',                          '<$1>' ),
3723                                 $safeHeadline
3724                         );
3725                         $tocline = trim( $tocline );
3726
3727                         # For the anchor, strip out HTML-y stuff period
3728                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3729                         $safeHeadline = preg_replace( '/[ _]+/', ' ', $safeHeadline );
3730                         $safeHeadline = trim( $safeHeadline );
3731
3732                         # Save headline for section edit hint before it's escaped
3733                         $headlineHint = $safeHeadline;
3734
3735                         if ( $wgHtml5 && $wgExperimentalHtmlIds ) {
3736                                 # For reverse compatibility, provide an id that's
3737                                 # HTML4-compatible, like we used to.
3738                                 #
3739                                 # It may be worth noting, academically, that it's possible for
3740                                 # the legacy anchor to conflict with a non-legacy headline
3741                                 # anchor on the page.  In this case likely the "correct" thing
3742                                 # would be to either drop the legacy anchors or make sure
3743                                 # they're numbered first.  However, this would require people
3744                                 # to type in section names like "abc_.D7.93.D7.90.D7.A4"
3745                                 # manually, so let's not bother worrying about it.
3746                                 $legacyHeadline = Sanitizer::escapeId( $safeHeadline,
3747                                         array( 'noninitial', 'legacy' ) );
3748                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3749
3750                                 if ( $legacyHeadline == $safeHeadline ) {
3751                                         # No reason to have both (in fact, we can't)
3752                                         $legacyHeadline = false;
3753                                 }
3754                         } else {
3755                                 $legacyHeadline = false;
3756                                 $safeHeadline = Sanitizer::escapeId( $safeHeadline,
3757                                         'noninitial' );
3758                         }
3759
3760                         # HTML names must be case-insensitively unique (bug 10721).  FIXME:
3761                         # Does this apply to Unicode characters?  Because we aren't
3762                         # handling those here.
3763                         $arrayKey = strtolower( $safeHeadline );
3764                         if ( $legacyHeadline === false ) {
3765                                 $legacyArrayKey = false;
3766                         } else {
3767                                 $legacyArrayKey = strtolower( $legacyHeadline );
3768                         }
3769
3770                         # count how many in assoc. array so we can track dupes in anchors
3771                         if ( isset( $refers[$arrayKey] ) ) {
3772                                 $refers[$arrayKey]++;
3773                         } else {
3774                                 $refers[$arrayKey] = 1;
3775                         }
3776                         if ( isset( $refers[$legacyArrayKey] ) ) {
3777                                 $refers[$legacyArrayKey]++;
3778                         } else {
3779                                 $refers[$legacyArrayKey] = 1;
3780                         }
3781
3782                         # Don't number the heading if it is the only one (looks silly)
3783                         if ( $doNumberHeadings && count( $matches[3] ) > 1) {
3784                                 # the two are different if the line contains a link
3785                                 $headline = $numbering . ' ' . $headline;
3786                         }
3787
3788                         # Create the anchor for linking from the TOC to the section
3789                         $anchor = $safeHeadline;
3790                         $legacyAnchor = $legacyHeadline;
3791                         if ( $refers[$arrayKey] > 1 ) {
3792                                 $anchor .= '_' . $refers[$arrayKey];
3793                         }
3794                         if ( $legacyHeadline !== false && $refers[$legacyArrayKey] > 1 ) {
3795                                 $legacyAnchor .= '_' . $refers[$legacyArrayKey];
3796                         }
3797                         if ( $enoughToc && ( !isset( $wgMaxTocLevel ) || $toclevel < $wgMaxTocLevel ) ) {
3798                                 $toc .= $sk->tocLine( $anchor, $tocline,
3799                                         $numbering, $toclevel, ( $isTemplate ? false : $sectionIndex ) );
3800                         }
3801
3802                         # Add the section to the section tree
3803                         # Find the DOM node for this header
3804                         while ( $node && !$isTemplate ) {
3805                                 if ( $node->getName() === 'h' ) {
3806                                         $bits = $node->splitHeading();
3807                                         if ( $bits['i'] == $sectionIndex )
3808                                                 break;
3809                                 }
3810                                 $byteOffset += mb_strlen( $this->mStripState->unstripBoth(
3811                                         $frame->expand( $node, PPFrame::RECOVER_ORIG ) ) );
3812                                 $node = $node->getNextSibling();
3813                         }
3814                         $tocraw[] = array(
3815                                 'toclevel' => $toclevel,
3816                                 'level' => $level,
3817                                 'line' => $tocline,
3818                                 'number' => $numbering,
3819                                 'index' => ( $isTemplate ? 'T-' : '' ) . $sectionIndex,
3820                                 'fromtitle' => $titleText,
3821                                 'byteoffset' => ( $isTemplate ? null : $byteOffset ),
3822                                 'anchor' => $anchor,
3823                         );
3824
3825                         # give headline the correct <h#> tag
3826                         if ( $showEditLink && $sectionIndex !== false ) {
3827                                 if ( $isTemplate ) {
3828                                         # Put a T flag in the section identifier, to indicate to extractSections()
3829                                         # that sections inside <includeonly> should be counted.
3830                                         $editlink = $sk->doEditSectionLink( Title::newFromText( $titleText ), "T-$sectionIndex" );
3831                                 } else {
3832                                         $editlink = $sk->doEditSectionLink( $this->mTitle, $sectionIndex, $headlineHint );
3833                                 }
3834                         } else {
3835                                 $editlink = '';
3836                         }
3837                         $head[$headlineCount] = $sk->makeHeadline( $level,
3838                                 $matches['attrib'][$headlineCount], $anchor, $headline,
3839                                 $editlink, $legacyAnchor );
3840
3841                         $headlineCount++;
3842                 }
3843
3844                 $this->setOutputType( $oldType );
3845
3846                 # Never ever show TOC if no headers
3847                 if ( $numVisible < 1 ) {
3848                         $enoughToc = false;
3849                 }
3850
3851                 if ( $enoughToc ) {
3852                         if ( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
3853                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
3854                         }
3855                         $toc = $sk->tocList( $toc );
3856                         $this->mOutput->setTOCHTML( $toc );
3857                 }
3858
3859                 if ( $isMain ) {
3860                         $this->mOutput->setSections( $tocraw );
3861                 }
3862
3863                 # split up and insert constructed headlines
3864
3865                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3866                 $i = 0;
3867
3868                 foreach ( $blocks as $block ) {
3869                         if ( $showEditLink && $headlineCount > 0 && $i == 0 && $block !== "\n" ) {
3870                                 # This is the [edit] link that appears for the top block of text when
3871                                 # section editing is enabled
3872
3873                                 # Disabled because it broke block formatting
3874                                 # For example, a bullet point in the top line
3875                                 # $full .= $sk->editSectionLink(0);
3876                         }
3877                         $full .= $block;
3878                         if ( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3879                                 # Top anchor now in skin
3880                                 $full = $full.$toc;
3881                         }
3882
3883                         if ( !empty( $head[$i] ) ) {
3884                                 $full .= $head[$i];
3885                         }
3886                         $i++;
3887                 }
3888                 if ( $this->mForceTocPosition ) {
3889                         return str_replace( '<!--MWTOC-->', $toc, $full );
3890                 } else {
3891                         return $full;
3892                 }
3893         }
3894
3895         /**
3896          * Merge $tree2 into $tree1 by replacing the section with index
3897          * $section in $tree1 and its descendants with the sections in $tree2.
3898          * Note that in the returned section tree, only the 'index' and
3899          * 'byteoffset' fields are guaranteed to be correct.
3900          * @param $tree1 array Section tree from ParserOutput::getSectons()
3901         *  @param $tree2 array Section tree
3902          * @param $section int Section index
3903          * @param $title Title Title both section trees come from
3904          * @param $len2 int Length of the original wikitext for $tree2
3905          * @return array Merged section tree
3906          */
3907         public static function mergeSectionTrees( $tree1, $tree2, $section, $title, $len2 ) {
3908                 global $wgContLang;
3909                 $newTree = array();
3910                 $targetLevel = false;
3911                 $merged = false;
3912                 $lastLevel = 1;
3913                 $nextIndex = 1;
3914                 $numbering = array( 0 );
3915                 $titletext = $title->getPrefixedDBkey();
3916                 foreach ( $tree1 as $s ) {
3917                         if ( $targetLevel !== false ) {
3918                                 if ( $s['level'] <= $targetLevel ) {
3919                                         # We've skipped enough
3920                                         $targetLevel = false;
3921                                 } else {
3922                                         continue;
3923                                 }
3924                         }
3925                         if ( $s['index'] != $section ||
3926                                         $s['fromtitle'] != $titletext ) {
3927                                 self::incrementNumbering( $numbering,
3928                                         $s['toclevel'], $lastLevel );
3929
3930                                 # Rewrite index, byteoffset and number
3931                                 if ( $s['fromtitle'] == $titletext ) {
3932                                         $s['index'] = $nextIndex++;
3933                                         if ( $merged ) {
3934                                                 $s['byteoffset'] += $len2;
3935                                         }
3936                                 }
3937                                 $s['number']  = implode( '.', array_map(
3938                                         array( $wgContLang, 'formatnum' ),
3939                                         $numbering ) );
3940                                 $lastLevel = $s['toclevel'];
3941                                 $newTree[] = $s;
3942                         } else {
3943                                 # We're at $section
3944                                 # Insert sections from $tree2 here
3945                                 foreach ( $tree2 as $s2 ) {
3946                                         # Rewrite the fields in $s2
3947                                         # before inserting it
3948                                         $s2['toclevel'] += $s['toclevel'] - 1;
3949                                         $s2['level'] += $s['level'] - 1;
3950                                         $s2['index'] = $nextIndex++;
3951                                         $s2['byteoffset'] += $s['byteoffset'];
3952
3953                                         self::incrementNumbering( $numbering,
3954                                                 $s2['toclevel'], $lastLevel );
3955                                         $s2['number']  = implode( '.', array_map(
3956                                                 array( $wgContLang, 'formatnum' ),
3957                                                 $numbering ) );
3958                                         $lastLevel = $s2['toclevel'];
3959                                         $newTree[] = $s2;
3960                                 }
3961                                 # Skip all descendants of $section in $tree1
3962                                 $targetLevel = $s['level'];
3963                                 $merged = true;
3964                         }
3965                 }
3966                 return $newTree;
3967         }
3968
3969         /**
3970          * Increment a section number. Helper function for mergeSectionTrees()
3971          * @param $number array Array representing a section number
3972          * @param $level int Current TOC level (depth)
3973          * @param $lastLevel int Level of previous TOC entry
3974          */
3975         private static function incrementNumbering( &$number, $level, $lastLevel ) {
3976                 if ( $level > $lastLevel ) {
3977                         $number[$level - 1] = 1;
3978                 } elseif ( $level < $lastLevel ) {
3979                         foreach ( $number as $key => $unused )
3980                                 if ( $key >= $level ) {
3981                                         unset( $number[$key] );
3982                                 }
3983                         $number[$level - 1]++;
3984                 } else {
3985                         $number[$level - 1]++;
3986                 }
3987         }
3988
3989         /**
3990          * Transform wiki markup when saving a page by doing \r\n -> \n
3991          * conversion, substitting signatures, {{subst:}} templates, etc.
3992          *
3993          * @param string $text the text to transform
3994          * @param Title &$title the Title object for the current article
3995          * @param User $user the User object describing the current user
3996          * @param ParserOptions $options parsing options
3997          * @param bool $clearState whether to clear the parser state first
3998          * @return string the altered wiki markup
3999          * @public
4000          */
4001         function preSaveTransform( $text, Title $title, $user, $options, $clearState = true ) {
4002                 $this->mOptions = $options;
4003                 $this->setTitle( $title );
4004                 $this->setOutputType( self::OT_WIKI );
4005
4006                 if ( $clearState ) {
4007                         $this->clearState();
4008                 }
4009
4010                 $pairs = array(
4011                         "\r\n" => "\n",
4012                 );
4013                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
4014                 $text = $this->pstPass2( $text, $user );
4015                 $text = $this->mStripState->unstripBoth( $text );
4016                 return $text;
4017         }
4018
4019         /**
4020          * Pre-save transform helper function
4021          * @private
4022          */
4023         function pstPass2( $text, $user ) {
4024                 global $wgContLang, $wgLocaltimezone;
4025
4026                 # Note: This is the timestamp saved as hardcoded wikitext to
4027                 # the database, we use $wgContLang here in order to give
4028                 # everyone the same signature and use the default one rather
4029                 # than the one selected in each user's preferences.
4030                 # (see also bug 12815)
4031                 $ts = $this->mOptions->getTimestamp();
4032                 if ( isset( $wgLocaltimezone ) ) {
4033                         $tz = $wgLocaltimezone;
4034                 } else {
4035                         $tz = date_default_timezone_get();
4036                 }
4037
4038                 $unixts = wfTimestamp( TS_UNIX, $ts );
4039                 $oldtz = date_default_timezone_get();
4040                 date_default_timezone_set( $tz );
4041                 $ts = date( 'YmdHis', $unixts );
4042                 $tzMsg = date( 'T', $unixts );  # might vary on DST changeover!
4043
4044                 # Allow translation of timezones trough wiki. date() can return
4045                 # whatever crap the system uses, localised or not, so we cannot
4046                 # ship premade translations.
4047                 $key = 'timezone-' . strtolower( trim( $tzMsg ) );
4048                 $value = wfMsgForContent( $key );
4049                 if ( !wfEmptyMsg( $key, $value ) ) {
4050                         $tzMsg = $value;
4051                 }
4052
4053                 date_default_timezone_set( $oldtz );
4054
4055                 $d = $wgContLang->timeanddate( $ts, false, false ) . " ($tzMsg)";
4056
4057                 # Variable replacement
4058                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4059                 $text = $this->replaceVariables( $text );
4060
4061                 # Signatures
4062                 $sigText = $this->getUserSig( $user );
4063                 $text = strtr( $text, array(
4064                         '~~~~~' => $d,
4065                         '~~~~' => "$sigText $d",
4066                         '~~~' => $sigText
4067                 ) );
4068
4069                 # Context links: [[|name]] and [[name (context)|]]
4070                 global $wgLegalTitleChars;
4071                 $tc = "[$wgLegalTitleChars]";
4072                 $nc = '[ _0-9A-Za-z\x80-\xff-]'; # Namespaces can use non-ascii!
4073
4074                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
4075                 $p4 = "/\[\[(:?$nc+:|:|)($tc+?)(（$tc+）)\\|]]/";             # [[ns:page（context）|]]
4076                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4077                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4078
4079                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4080                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4081                 $text = preg_replace( $p4, '[[\\1\\2\\3|\\2]]', $text );
4082                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4083
4084                 $t = $this->mTitle->getText();
4085                 $m = array();
4086                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4087                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4088                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && "$m[1]$m[2]" != '' ) {
4089                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4090                 } else {
4091                         # if there's no context, don't bother duplicating the title
4092                         $text = preg_replace( $p2, '[[\\1]]', $text );
4093                 }
4094
4095                 # Trim trailing whitespace
4096                 $text = rtrim( $text );
4097
4098                 return $text;
4099         }
4100
4101         /**
4102          * Fetch the user's signature text, if any, and normalize to
4103          * validated, ready-to-insert wikitext.
4104          * If you have pre-fetched the nickname or the fancySig option, you can
4105          * specify them here to save a database query.
4106          *
4107          * @param User $user
4108          * @return string
4109          */
4110         function getUserSig( &$user, $nickname = false, $fancySig = null ) {
4111                 global $wgMaxSigChars;
4112
4113                 $username = $user->getName();
4114
4115                 # If not given, retrieve from the user object.
4116                 if ( $nickname === false )
4117                         $nickname = $user->getOption( 'nickname' );
4118
4119                 if ( is_null( $fancySig ) ) {
4120                         $fancySig = $user->getBoolOption( 'fancysig' );
4121                 }
4122
4123                 $nickname = $nickname == null ? $username : $nickname;
4124
4125                 if ( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4126                         $nickname = $username;
4127                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4128                 } elseif ( $fancySig !== false ) {
4129                         # Sig. might contain markup; validate this
4130                         if ( $this->validateSig( $nickname ) !== false ) {
4131                                 # Validated; clean up (if needed) and return it
4132                                 return $this->cleanSig( $nickname, true );
4133                         } else {
4134                                 # Failed to validate; fall back to the default
4135                                 $nickname = $username;
4136                                 wfDebug( __METHOD__.": $username has bad XML tags in signature.\n" );
4137                         }
4138                 }
4139
4140                 # Make sure nickname doesnt get a sig in a sig
4141                 $nickname = $this->cleanSigInSig( $nickname );
4142
4143                 # If we're still here, make it a link to the user page
4144                 $userText = wfEscapeWikiText( $username );
4145                 $nickText = wfEscapeWikiText( $nickname );
4146                 if ( $user->isAnon() )  {
4147                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4148                 } else {
4149                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4150                 }
4151         }
4152
4153         /**
4154          * Check that the user's signature contains no bad XML
4155          *
4156          * @param string $text
4157          * @return mixed An expanded string, or false if invalid.
4158          */
4159         function validateSig( $text ) {
4160                 return( Xml::isWellFormedXmlFragment( $text ) ? $text : false );
4161         }
4162
4163         /**
4164          * Clean up signature text
4165          *
4166          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4167          * 2) Substitute all transclusions
4168          *
4169          * @param string $text
4170          * @param $parsing Whether we're cleaning (preferences save) or parsing
4171          * @return string Signature text
4172          */
4173         function cleanSig( $text, $parsing = false ) {
4174                 if ( !$parsing ) {
4175                         global $wgTitle;
4176                         $this->clearState();
4177                         $this->setTitle( $wgTitle );
4178                         $this->mOptions = new ParserOptions;
4179                         $this->setOutputType = self::OT_PREPROCESS;
4180                 }
4181
4182                 # Option to disable this feature
4183                 if ( !$this->mOptions->getCleanSignatures() ) {
4184                         return $text;
4185                 }
4186
4187                 # FIXME: regex doesn't respect extension tags or nowiki
4188                 #  => Move this logic to braceSubstitution()
4189                 $substWord = MagicWord::get( 'subst' );
4190                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4191                 $substText = '{{' . $substWord->getSynonym( 0 );
4192
4193                 $text = preg_replace( $substRegex, $substText, $text );
4194                 $text = $this->cleanSigInSig( $text );
4195                 $dom = $this->preprocessToDom( $text );
4196                 $frame = $this->getPreprocessor()->newFrame();
4197                 $text = $frame->expand( $dom );
4198
4199                 if ( !$parsing ) {
4200                         $text = $this->mStripState->unstripBoth( $text );
4201                 }
4202
4203                 return $text;
4204         }
4205
4206         /**
4207          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4208          * @param string $text
4209          * @return string Signature text with /~{3,5}/ removed
4210          */
4211         function cleanSigInSig( $text ) {
4212                 $text = preg_replace( '/~{3,5}/', '', $text );
4213                 return $text;
4214         }
4215
4216         /**
4217          * Set up some variables which are usually set up in parse()
4218          * so that an external function can call some class members with confidence
4219          * @public
4220          */
4221         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4222                 $this->setTitle( $title );
4223                 $this->mOptions = $options;
4224                 $this->setOutputType( $outputType );
4225                 if ( $clearState ) {
4226                         $this->clearState();
4227                 }
4228         }
4229
4230         /**
4231          * Wrapper for preprocess()
4232          *
4233          * @param string $text the text to preprocess
4234          * @param ParserOptions $options  options
4235          * @return string
4236          * @public
4237          */
4238         function transformMsg( $text, $options ) {
4239                 global $wgTitle;
4240                 static $executing = false;
4241
4242                 # Guard against infinite recursion
4243                 if ( $executing ) {
4244                         return $text;
4245                 }
4246                 $executing = true;
4247
4248                 wfProfileIn( __METHOD__ );
4249                 $text = $this->preprocess( $text, $wgTitle, $options );
4250
4251                 $executing = false;
4252                 wfProfileOut( __METHOD__ );
4253                 return $text;
4254         }
4255
4256         /**
4257          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4258          * The callback should have the following form:
4259          *    function myParserHook( $text, $params, $parser ) { ... }
4260          *
4261          * Transform and return $text. Use $parser for any required context, e.g. use
4262          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4263          *
4264          * @public
4265          *
4266          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4267          * @param mixed $callback The callback function (and object) to use for the tag
4268          *
4269          * @return The old value of the mTagHooks array associated with the hook
4270          */
4271         function setHook( $tag, $callback ) {
4272                 $tag = strtolower( $tag );
4273                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4274                 $this->mTagHooks[$tag] = $callback;
4275                 if ( !in_array( $tag, $this->mStripList ) ) {
4276                         $this->mStripList[] = $tag;
4277                 }
4278
4279                 return $oldVal;
4280         }
4281
4282         function setTransparentTagHook( $tag, $callback ) {
4283                 $tag = strtolower( $tag );
4284                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4285                 $this->mTransparentTagHooks[$tag] = $callback;
4286
4287                 return $oldVal;
4288         }
4289
4290         /**
4291          * Remove all tag hooks
4292          */
4293         function clearTagHooks() {
4294                 $this->mTagHooks = array();
4295                 $this->mStripList = $this->mDefaultStripList;
4296         }
4297
4298         /**
4299          * Create a function, e.g. {{sum:1|2|3}}
4300          * The callback function should have the form:
4301          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4302          *
4303          * Or with SFH_OBJECT_ARGS:
4304          *    function myParserFunction( $parser, $frame, $args ) { ... }
4305          *
4306          * The callback may either return the text result of the function, or an array with the text
4307          * in element 0, and a number of flags in the other elements. The names of the flags are
4308          * specified in the keys. Valid flags are:
4309          *   found                     The text returned is valid, stop processing the template. This
4310          *                             is on by default.
4311          *   nowiki                    Wiki markup in the return value should be escaped
4312          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4313          *
4314          * @public
4315          *
4316          * @param string $id The magic word ID
4317          * @param mixed $callback The callback function (and object) to use
4318          * @param integer $flags a combination of the following flags:
4319          *     SFH_NO_HASH   No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4320          *
4321          *     SFH_OBJECT_ARGS   Pass the template arguments as PPNode objects instead of text. This
4322          *     allows for conditional expansion of the parse tree, allowing you to eliminate dead
4323          *     branches and thus speed up parsing. It is also possible to analyse the parse tree of
4324          *     the arguments, and to control the way they are expanded.
4325          *
4326          *     The $frame parameter is a PPFrame. This can be used to produce expanded text from the
4327          *     arguments, for instance:
4328          *         $text = isset( $args[0] ) ? $frame->expand( $args[0] ) : '';
4329          *
4330          *     For technical reasons, $args[0] is pre-expanded and will be a string. This may change in
4331          *     future versions. Please call $frame->expand() on it anyway so that your code keeps
4332          *     working if/when this is changed.
4333          *
4334          *     If you want whitespace to be trimmed from $args, you need to do it yourself, post-
4335          *     expansion.
4336          *
4337          *     Please read the documentation in includes/parser/Preprocessor.php for more information
4338          *     about the methods available in PPFrame and PPNode.
4339          *
4340          * @return The old callback function for this name, if any
4341          */
4342         function setFunctionHook( $id, $callback, $flags = 0 ) {
4343                 global $wgContLang;
4344
4345                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4346                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4347
4348                 # Add to function cache
4349                 $mw = MagicWord::get( $id );
4350                 if ( !$mw )
4351                         throw new MWException( __METHOD__.'() expecting a magic word identifier.' );
4352
4353                 $synonyms = $mw->getSynonyms();
4354                 $sensitive = intval( $mw->isCaseSensitive() );
4355
4356                 foreach ( $synonyms as $syn ) {
4357                         # Case
4358                         if ( !$sensitive ) {
4359                                 $syn = $wgContLang->lc( $syn );
4360                         }
4361                         # Add leading hash
4362                         if ( !( $flags & SFH_NO_HASH ) ) {
4363                                 $syn = '#' . $syn;
4364                         }
4365                         # Remove trailing colon
4366                         if ( substr( $syn, -1, 1 ) === ':' ) {
4367                                 $syn = substr( $syn, 0, -1 );
4368                         }
4369                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4370                 }
4371                 return $oldVal;
4372         }
4373
4374         /**
4375          * Get all registered function hook identifiers
4376          *
4377          * @return array
4378          */
4379         function getFunctionHooks() {
4380                 return array_keys( $this->mFunctionHooks );
4381         }
4382
4383         /**
4384          * Create a tag function, e.g. <test>some stuff</test>.
4385          * Unlike tag hooks, tag functions are parsed at preprocessor level.
4386          * Unlike parser functions, their content is not preprocessed.
4387          */
4388         function setFunctionTagHook( $tag, $callback, $flags ) {
4389                 $tag = strtolower( $tag );
4390                 $old = isset( $this->mFunctionTagHooks[$tag] ) ?
4391                         $this->mFunctionTagHooks[$tag] : null;
4392                 $this->mFunctionTagHooks[$tag] = array( $callback, $flags );
4393
4394                 if ( !in_array( $tag, $this->mStripList ) ) {
4395                         $this->mStripList[] = $tag;
4396                 }
4397
4398                 return $old;
4399         }
4400
4401         /**
4402          * FIXME: update documentation. makeLinkObj() is deprecated.
4403          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4404          * Placeholders created in Skin::makeLinkObj()
4405          * Returns an array of link CSS classes, indexed by PDBK.
4406          */
4407         function replaceLinkHolders( &$text, $options = 0 ) {
4408                 return $this->mLinkHolders->replace( $text );
4409         }
4410
4411         /**
4412          * Replace <!--LINK--> link placeholders with plain text of links
4413          * (not HTML-formatted).
4414          * @param string $text
4415          * @return string
4416          */
4417         function replaceLinkHoldersText( $text ) {
4418                 return $this->mLinkHolders->replaceText( $text );
4419         }
4420
4421         /**
4422          * Renders an image gallery from a text with one line per image.
4423          * text labels may be given by using |-style alternative text. E.g.
4424          *   Image:one.jpg|The number "1"
4425          *   Image:tree.jpg|A tree
4426          * given as text will return the HTML of a gallery with two images,
4427          * labeled 'The number "1"' and
4428          * 'A tree'.
4429          */
4430         function renderImageGallery( $text, $params ) {
4431                 $ig = new ImageGallery();
4432                 $ig->setContextTitle( $this->mTitle );
4433                 $ig->setShowBytes( false );
4434                 $ig->setShowFilename( false );
4435                 $ig->setParser( $this );
4436                 $ig->setHideBadImages();
4437                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4438                 $ig->useSkin( $this->mOptions->getSkin() );
4439                 $ig->mRevisionId = $this->mRevisionId;
4440
4441                 if ( isset( $params['showfilename'] ) ) {
4442                         $ig->setShowFilename( true );
4443                 } else {
4444                         $ig->setShowFilename( false );
4445                 }
4446                 if ( isset( $params['caption'] ) ) {
4447                         $caption = $params['caption'];
4448                         $caption = htmlspecialchars( $caption );
4449                         $caption = $this->replaceInternalLinks( $caption );
4450                         $ig->setCaptionHtml( $caption );
4451                 }
4452                 if ( isset( $params['perrow'] ) ) {
4453                         $ig->setPerRow( $params['perrow'] );
4454                 }
4455                 if ( isset( $params['widths'] ) ) {
4456                         $ig->setWidths( $params['widths'] );
4457                 }
4458                 if ( isset( $params['heights'] ) ) {
4459                         $ig->setHeights( $params['heights'] );
4460                 }
4461
4462                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4463
4464                 $lines = StringUtils::explode( "\n", $text );
4465                 foreach ( $lines as $line ) {
4466                         # match lines like these:
4467                         # Image:someimage.jpg|This is some image
4468                         $matches = array();
4469                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4470                         # Skip empty lines
4471                         if ( count( $matches ) == 0 ) {
4472                                 continue;
4473                         }
4474
4475                         if ( strpos( $matches[0], '%' ) !== false ) {
4476                                 $matches[1] = urldecode( $matches[1] );
4477                         }
4478                         $tp = Title::newFromText( $matches[1] );
4479                         $nt =& $tp;
4480                         if ( is_null( $nt ) ) {
4481                                 # Bogus title. Ignore these so we don't bomb out later.
4482                                 continue;
4483                         }
4484                         if ( isset( $matches[3] ) ) {
4485                                 $label = $matches[3];
4486                         } else {
4487                                 $label = '';
4488                         }
4489
4490                         $html = $this->recursiveTagParse( trim( $label ) );
4491
4492                         $ig->add( $nt, $html );
4493
4494                         # Only add real images (bug #5586)
4495                         if ( $nt->getNamespace() == NS_FILE ) {
4496                                 $this->mOutput->addImage( $nt->getDBkey() );
4497                         }
4498                 }
4499                 return $ig->toHTML();
4500         }
4501
4502         function getImageParams( $handler ) {
4503                 if ( $handler ) {
4504                         $handlerClass = get_class( $handler );
4505                 } else {
4506                         $handlerClass = '';
4507                 }
4508                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4509                         # Initialise static lists
4510                         static $internalParamNames = array(
4511                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4512                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4513                                         'bottom', 'text-bottom' ),
4514                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4515                                         'upright', 'border', 'link', 'alt' ),
4516                         );
4517                         static $internalParamMap;
4518                         if ( !$internalParamMap ) {
4519                                 $internalParamMap = array();
4520                                 foreach ( $internalParamNames as $type => $names ) {
4521                                         foreach ( $names as $name ) {
4522                                                 $magicName = str_replace( '-', '_', "img_$name" );
4523                                                 $internalParamMap[$magicName] = array( $type, $name );
4524                                         }
4525                                 }
4526                         }
4527
4528                         # Add handler params
4529                         $paramMap = $internalParamMap;
4530                         if ( $handler ) {
4531                                 $handlerParamMap = $handler->getParamMap();
4532                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4533                                         $paramMap[$magic] = array( 'handler', $paramName );
4534                                 }
4535                         }
4536                         $this->mImageParams[$handlerClass] = $paramMap;
4537                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4538                 }
4539                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4540         }
4541
4542         /**
4543          * Parse image options text and use it to make an image
4544          * @param Title $title
4545          * @param string $options
4546          * @param LinkHolderArray $holders
4547          */
4548         function makeImage( $title, $options, $holders = false ) {
4549                 # Check if the options text is of the form "options|alt text"
4550                 # Options are:
4551                 #  * thumbnail  make a thumbnail with enlarge-icon and caption, alignment depends on lang
4552                 #  * left       no resizing, just left align. label is used for alt= only
4553                 #  * right      same, but right aligned
4554                 #  * none       same, but not aligned
4555                 #  * ___px      scale to ___ pixels width, no aligning. e.g. use in taxobox
4556                 #  * center     center the image
4557                 #  * frame      Keep original image size, no magnify-button.
4558                 #  * framed     Same as "frame"
4559                 #  * frameless  like 'thumb' but without a frame. Keeps user preferences for width
4560                 #  * upright    reduce width for upright images, rounded to full __0 px
4561                 #  * border     draw a 1px border around the image
4562                 #  * alt        Text for HTML alt attribute (defaults to empty)
4563                 #  * link       Set the target of the image link. Can be external, interwiki, or local
4564                 # vertical-align values (no % or length right now):
4565                 #  * baseline
4566                 #  * sub
4567                 #  * super
4568                 #  * top
4569                 #  * text-top
4570                 #  * middle
4571                 #  * bottom
4572                 #  * text-bottom
4573
4574                 $parts = StringUtils::explode( "|", $options );
4575                 $sk = $this->mOptions->getSkin();
4576
4577                 # Give extensions a chance to select the file revision for us
4578                 $skip = $time = $descQuery = false;
4579                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time, &$descQuery ) );
4580
4581                 if ( $skip ) {
4582                         return $sk->link( $title );
4583                 }
4584
4585                 # Get the file
4586                 $imagename = $title->getDBkey();
4587                 $file = wfFindFile( $title, array( 'time' => $time ) );
4588                 # Get parameter map
4589                 $handler = $file ? $file->getHandler() : false;
4590
4591                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4592
4593                 # Process the input parameters
4594                 $caption = '';
4595                 $params = array( 'frame' => array(), 'handler' => array(),
4596                         'horizAlign' => array(), 'vertAlign' => array() );
4597                 foreach ( $parts as $part ) {
4598                         $part = trim( $part );
4599                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4600                         $validated = false;
4601                         if ( isset( $paramMap[$magicName] ) ) {
4602                                 list( $type, $paramName ) = $paramMap[$magicName];
4603
4604                                 # Special case; width and height come in one variable together
4605                                 if ( $type === 'handler' && $paramName === 'width' ) {
4606                                         $m = array();
4607                                         # (bug 13500) In both cases (width/height and width only),
4608                                         # permit trailing "px" for backward compatibility.
4609                                         if ( preg_match( '/^([0-9]*)x([0-9]*)\s*(?:px)?\s*$/', $value, $m ) ) {
4610                                                 $width = intval( $m[1] );
4611                                                 $height = intval( $m[2] );
4612                                                 if ( $handler->validateParam( 'width', $width ) ) {
4613                                                         $params[$type]['width'] = $width;
4614                                                         $validated = true;
4615                                                 }
4616                                                 if ( $handler->validateParam( 'height', $height ) ) {
4617                                                         $params[$type]['height'] = $height;
4618                                                         $validated = true;
4619                                                 }
4620                                         } elseif ( preg_match( '/^[0-9]*\s*(?:px)?\s*$/', $value ) ) {
4621                                                 $width = intval( $value );
4622                                                 if ( $handler->validateParam( 'width', $width ) ) {
4623                                                         $params[$type]['width'] = $width;
4624                                                         $validated = true;
4625                                                 }
4626                                         } # else no validation -- bug 13436
4627                                 } else {
4628                                         if ( $type === 'handler' ) {
4629                                                 # Validate handler parameter
4630                                                 $validated = $handler->validateParam( $paramName, $value );
4631                                         } else {
4632                                                 # Validate internal parameters
4633                                                 switch( $paramName ) {
4634                                                 case 'manualthumb':
4635                                                 case 'alt':
4636                                                         # @todo Fixme: possibly check validity here for
4637                                                         # manualthumb? downstream behavior seems odd with
4638                                                         # missing manual thumbs.
4639                                                         $validated = true;
4640                                                         $value = $this->stripAltText( $value, $holders );
4641                                                         break;
4642                                                 case 'link':
4643                                                         $chars = self::EXT_LINK_URL_CLASS;
4644                                                         $prots = $this->mUrlProtocols;
4645                                                         if ( $value === '' ) {
4646                                                                 $paramName = 'no-link';
4647                                                                 $value = true;
4648                                                                 $validated = true;
4649                                                         } elseif ( preg_match( "/^$prots/", $value ) ) {
4650                                                                 if ( preg_match( "/^($prots)$chars+$/", $value, $m ) ) {
4651                                                                         $paramName = 'link-url';
4652                                                                         $this->mOutput->addExternalLink( $value );
4653                                                                         $validated = true;
4654                                                                 }
4655                                                         } else {
4656                                                                 $linkTitle = Title::newFromText( $value );
4657                                                                 if ( $linkTitle ) {
4658                                                                         $paramName = 'link-title';
4659                                                                         $value = $linkTitle;
4660                                                                         $this->mOutput->addLink( $linkTitle );
4661                                                                         $validated = true;
4662                                                                 }
4663                                                         }
4664                                                         break;
4665                                                 default:
4666                                                         # Most other things appear to be empty or numeric...
4667                                                         $validated = ( $value === false || is_numeric( trim( $value ) ) );
4668                                                 }
4669                                         }
4670
4671                                         if ( $validated ) {
4672                                                 $params[$type][$paramName] = $value;
4673                                         }
4674                                 }
4675                         }
4676                         if ( !$validated ) {
4677                                 $caption = $part;
4678                         }
4679                 }
4680
4681                 # Process alignment parameters
4682                 if ( $params['horizAlign'] ) {
4683                         $params['frame']['align'] = key( $params['horizAlign'] );
4684                 }
4685                 if ( $params['vertAlign'] ) {
4686                         $params['frame']['valign'] = key( $params['vertAlign'] );
4687                 }
4688
4689                 $params['frame']['caption'] = $caption;
4690
4691                 # Will the image be presented in a frame, with the caption below?
4692                 $imageIsFramed = isset( $params['frame']['frame'] ) ||
4693                                  isset( $params['frame']['framed'] ) ||
4694                                  isset( $params['frame']['thumbnail'] ) ||
4695                                  isset( $params['frame']['manualthumb'] );
4696
4697                 # In the old days, [[Image:Foo|text...]] would set alt text.  Later it
4698                 # came to also set the caption, ordinary text after the image -- which
4699                 # makes no sense, because that just repeats the text multiple times in
4700                 # screen readers.  It *also* came to set the title attribute.
4701                 #
4702                 # Now that we have an alt attribute, we should not set the alt text to
4703                 # equal the caption: that's worse than useless, it just repeats the
4704                 # text.  This is the framed/thumbnail case.  If there's no caption, we
4705                 # use the unnamed parameter for alt text as well, just for the time be-
4706                 # ing, if the unnamed param is set and the alt param is not.
4707                 #
4708                 # For the future, we need to figure out if we want to tweak this more,
4709                 # e.g., introducing a title= parameter for the title; ignoring the un-
4710                 # named parameter entirely for images without a caption; adding an ex-
4711                 # plicit caption= parameter and preserving the old magic unnamed para-
4712                 # meter for BC; ...
4713                 if ( $imageIsFramed ) { # Framed image
4714                         if ( $caption === '' && !isset( $params['frame']['alt'] ) ) {
4715                                 # No caption or alt text, add the filename as the alt text so
4716                                 # that screen readers at least get some description of the image
4717                                 $params['frame']['alt'] = $title->getText();
4718                         }
4719                         # Do not set $params['frame']['title'] because tooltips don't make sense
4720                         # for framed images
4721                 } else { # Inline image
4722                         if ( !isset( $params['frame']['alt'] ) ) {
4723                                 # No alt text, use the "caption" for the alt text
4724                                 if ( $caption !== '') {
4725                                         $params['frame']['alt'] = $this->stripAltText( $caption, $holders );
4726                                 } else {
4727                                         # No caption, fall back to using the filename for the
4728                                         # alt text
4729                                         $params['frame']['alt'] = $title->getText();
4730                                 }
4731                         }
4732                         # Use the "caption" for the tooltip text
4733                         $params['frame']['title'] = $this->stripAltText( $caption, $holders );
4734                 }
4735
4736                 wfRunHooks( 'ParserMakeImageParams', array( $title, $file, &$params ) );
4737
4738                 # Linker does the rest
4739                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'], $time, $descQuery );
4740
4741                 # Give the handler a chance to modify the parser object
4742                 if ( $handler ) {
4743                         $handler->parserTransformHook( $this, $file );
4744                 }
4745
4746                 return $ret;
4747         }
4748
4749         protected function stripAltText( $caption, $holders ) {
4750                 # Strip bad stuff out of the title (tooltip).  We can't just use
4751                 # replaceLinkHoldersText() here, because if this function is called
4752                 # from replaceInternalLinks2(), mLinkHolders won't be up-to-date.
4753                 if ( $holders ) {
4754                         $tooltip = $holders->replaceText( $caption );
4755                 } else {
4756                         $tooltip = $this->replaceLinkHoldersText( $caption );
4757                 }
4758
4759                 # make sure there are no placeholders in thumbnail attributes
4760                 # that are later expanded to html- so expand them now and
4761                 # remove the tags
4762                 $tooltip = $this->mStripState->unstripBoth( $tooltip );
4763                 $tooltip = Sanitizer::stripAllTags( $tooltip );
4764
4765                 return $tooltip;
4766         }
4767
4768         /**
4769          * Set a flag in the output object indicating that the content is dynamic and
4770          * shouldn't be cached.
4771          */
4772         function disableCache() {
4773                 wfDebug( "Parser output marked as uncacheable.\n" );
4774                 $this->mOutput->mCacheTime = -1;
4775         }
4776
4777         /**#@+
4778          * Callback from the Sanitizer for expanding items found in HTML attribute
4779          * values, so they can be safely tested and escaped.
4780          * @param string $text
4781          * @param PPFrame $frame
4782          * @return string
4783          * @private
4784          */
4785         function attributeStripCallback( &$text, $frame = false ) {
4786                 $text = $this->replaceVariables( $text, $frame );
4787                 $text = $this->mStripState->unstripBoth( $text );
4788                 return $text;
4789         }
4790
4791         /**#@-*/
4792
4793         /**#@+
4794          * Accessor/mutator
4795          */
4796         function Title( $x = null ) { return wfSetVar( $this->mTitle, $x ); }
4797         function Options( $x = null ) { return wfSetVar( $this->mOptions, $x ); }
4798         function OutputType( $x = null ) { return wfSetVar( $this->mOutputType, $x ); }
4799         /**#@-*/
4800
4801         /**#@+
4802          * Accessor
4803          */
4804         function getTags() {
4805                 return array_merge( array_keys( $this->mTransparentTagHooks ), array_keys( $this->mTagHooks ) );
4806         }
4807         /**#@-*/
4808
4809
4810         /**
4811          * Break wikitext input into sections, and either pull or replace
4812          * some particular section's text.
4813          *
4814          * External callers should use the getSection and replaceSection methods.
4815          *
4816          * @param string $text Page wikitext
4817          * @param string $section A section identifier string of the form:
4818          *   <flag1> - <flag2> - ... - <section number>
4819          *
4820          * Currently the only recognised flag is "T", which means the target section number
4821          * was derived during a template inclusion parse, in other words this is a template
4822          * section edit link. If no flags are given, it was an ordinary section edit link.
4823          * This flag is required to avoid a section numbering mismatch when a section is
4824          * enclosed by <includeonly> (bug 6563).
4825          *
4826          * The section number 0 pulls the text before the first heading; other numbers will
4827          * pull the given section along with its lower-level subsections. If the section is
4828          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
4829          *
4830          * @param string $mode One of "get" or "replace"
4831          * @param string $newText Replacement text for section data.
4832          * @return string for "get", the extracted section text.
4833          *                for "replace", the whole page with the section replaced.
4834          */
4835         private function extractSections( $text, $section, $mode, $newText='' ) {
4836                 global $wgTitle;
4837                 $this->clearState();
4838                 $this->setTitle( $wgTitle ); # not generally used but removes an ugly failure mode
4839                 $this->mOptions = new ParserOptions;
4840                 $this->setOutputType( self::OT_PLAIN );
4841                 $outText = '';
4842                 $frame = $this->getPreprocessor()->newFrame();
4843
4844                 # Process section extraction flags
4845                 $flags = 0;
4846                 $sectionParts = explode( '-', $section );
4847                 $sectionIndex = array_pop( $sectionParts );
4848                 foreach ( $sectionParts as $part ) {
4849                         if ( $part === 'T' ) {
4850                                 $flags |= self::PTD_FOR_INCLUSION;
4851                         }
4852                 }
4853                 # Preprocess the text
4854                 $root = $this->preprocessToDom( $text, $flags );
4855
4856                 # <h> nodes indicate section breaks
4857                 # They can only occur at the top level, so we can find them by iterating the root's children
4858                 $node = $root->getFirstChild();
4859
4860                 # Find the target section
4861                 if ( $sectionIndex == 0 ) {
4862                         # Section zero doesn't nest, level=big
4863                         $targetLevel = 1000;
4864                 } else {
4865             while ( $node ) {
4866                 if ( $node->getName() === 'h' ) {
4867                     $bits = $node->splitHeading();
4868                                         if ( $bits['i'] == $sectionIndex ) {
4869                                         $targetLevel = $bits['level'];
4870                                                 break;
4871                                         }
4872                                 }
4873                                 if ( $mode === 'replace' ) {
4874                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4875                                 }
4876                                 $node = $node->getNextSibling();
4877                         }
4878                 }
4879
4880                 if ( !$node ) {
4881                         # Not found
4882                         if ( $mode === 'get' ) {
4883                                 return $newText;
4884                         } else {
4885                                 return $text;
4886                         }
4887                 }
4888
4889                 # Find the end of the section, including nested sections
4890                 do {
4891                         if ( $node->getName() === 'h' ) {
4892                                 $bits = $node->splitHeading();
4893                                 $curLevel = $bits['level'];
4894                                 if ( $bits['i'] != $sectionIndex && $curLevel <= $targetLevel ) {
4895                                         break;
4896                                 }
4897                         }
4898                         if ( $mode === 'get' ) {
4899                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4900                         }
4901                         $node = $node->getNextSibling();
4902                 } while ( $node );
4903
4904                 # Write out the remainder (in replace mode only)
4905                 if ( $mode === 'replace' ) {
4906                         # Output the replacement text
4907                         # Add two newlines on -- trailing whitespace in $newText is conventionally
4908                         # stripped by the editor, so we need both newlines to restore the paragraph gap
4909                         # Only add trailing whitespace if there is newText
4910                         if ( $newText != "" ) {
4911                                 $outText .= $newText . "\n\n";
4912                         }
4913
4914                         while ( $node ) {
4915                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
4916                                 $node = $node->getNextSibling();
4917                         }
4918                 }
4919
4920                 if ( is_string( $outText ) ) {
4921                         # Re-insert stripped tags
4922                         $outText = rtrim( $this->mStripState->unstripBoth( $outText ) );
4923                 }
4924
4925                 return $outText;
4926         }
4927
4928         /**
4929          * This function returns the text of a section, specified by a number ($section).
4930          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4931          * the first section before any such heading (section 0).
4932          *
4933          * If a section contains subsections, these are also returned.
4934          *
4935          * @param string $text text to look in
4936          * @param string $section section identifier
4937          * @param string $deftext default to return if section is not found
4938          * @return string text of the requested section
4939          */
4940         public function getSection( $text, $section, $deftext='' ) {
4941                 return $this->extractSections( $text, $section, "get", $deftext );
4942         }
4943
4944         public function replaceSection( $oldtext, $section, $text ) {
4945                 return $this->extractSections( $oldtext, $section, "replace", $text );
4946         }
4947
4948         /**
4949          * Get the timestamp associated with the current revision, adjusted for
4950          * the default server-local timestamp
4951          */
4952         function getRevisionTimestamp() {
4953                 if ( is_null( $this->mRevisionTimestamp ) ) {
4954                         wfProfileIn( __METHOD__ );
4955                         global $wgContLang;
4956                         $dbr = wfGetDB( DB_SLAVE );
4957                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4958                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4959
4960                         # Normalize timestamp to internal MW format for timezone processing.
4961                         # This has the added side-effect of replacing a null value with
4962                         # the current time, which gives us more sensible behavior for
4963                         # previews.
4964                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4965
4966                         # The cryptic '' timezone parameter tells to use the site-default
4967                         # timezone offset instead of the user settings.
4968                         #
4969                         # Since this value will be saved into the parser cache, served
4970                         # to other users, and potentially even used inside links and such,
4971                         # it needs to be consistent for all visitors.
4972                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4973
4974                         wfProfileOut( __METHOD__ );
4975                 }
4976                 return $this->mRevisionTimestamp;
4977         }
4978
4979         /**
4980          * Get the name of the user that edited the last revision
4981          */
4982         function getRevisionUser() {
4983                 # if this template is subst: the revision id will be blank,
4984                 # so just use the current user's name
4985                 if ( $this->mRevisionId ) {
4986                         $revision = Revision::newFromId( $this->mRevisionId );
4987                         $revuser = $revision->getUserText();
4988                 } else {
4989                         global $wgUser;
4990                         $revuser = $wgUser->getName();
4991                 }
4992                 return $revuser;
4993         }
4994
4995         /**
4996          * Mutator for $mDefaultSort
4997          *
4998          * @param $sort New value
4999          */
5000         public function setDefaultSort( $sort ) {
5001                 $this->mDefaultSort = $sort;
5002         }
5003
5004         /**
5005          * Accessor for $mDefaultSort
5006          * Will use the title/prefixed title if none is set
5007          *
5008          * @return string
5009          */
5010         public function getDefaultSort() {
5011                 global $wgCategoryPrefixedDefaultSortkey;
5012                 if ( $this->mDefaultSort !== false ) {
5013                         return $this->mDefaultSort;
5014                 } elseif ( $this->mTitle->getNamespace() == NS_CATEGORY ||
5015                         !$wgCategoryPrefixedDefaultSortkey )
5016                 {
5017                         return $this->mTitle->getText();
5018                 } else {
5019                         return $this->mTitle->getPrefixedText();
5020                 }
5021         }
5022
5023         /**
5024          * Accessor for $mDefaultSort
5025          * Unlike getDefaultSort(), will return false if none is set
5026          *
5027          * @return string or false
5028          */
5029         public function getCustomDefaultSort() {
5030                 return $this->mDefaultSort;
5031         }
5032
5033         /**
5034          * Try to guess the section anchor name based on a wikitext fragment
5035          * presumably extracted from a heading, for example "Header" from
5036          * "== Header ==".
5037          */
5038         public function guessSectionNameFromWikiText( $text ) {
5039                 # Strip out wikitext links(they break the anchor)
5040                 $text = $this->stripSectionName( $text );
5041                 $headline = Sanitizer::decodeCharReferences( $text );
5042                 # strip out HTML
5043                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
5044                 $headline = trim( $headline );
5045                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
5046                 $replacearray = array(
5047                         '%3A' => ':',
5048                         '%' => '.'
5049                 );
5050                 return str_replace(
5051                         array_keys( $replacearray ),
5052                         array_values( $replacearray ),
5053                         $sectionanchor );
5054         }
5055
5056         /**
5057          * Strips a text string of wikitext for use in a section anchor
5058          *
5059          * Accepts a text string and then removes all wikitext from the
5060          * string and leaves only the resultant text (i.e. the result of
5061          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5062          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5063          * to create valid section anchors by mimicing the output of the
5064          * parser when headings are parsed.
5065          *
5066          * @param $text string Text string to be stripped of wikitext
5067          * for use in a Section anchor
5068          * @return Filtered text string
5069          */
5070         public function stripSectionName( $text ) {
5071                 # Strip internal link markup
5072                 $text = preg_replace( '/\[\[:?([^[|]+)\|([^[]+)\]\]/', '$2', $text );
5073                 $text = preg_replace( '/\[\[:?([^[]+)\|?\]\]/', '$1', $text );
5074
5075                 # Strip external link markup (FIXME: Not Tolerant to blank link text
5076                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5077                 # on how many empty links there are on the page - need to figure that out.
5078                 $text = preg_replace( '/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/', '$2', $text );
5079
5080                 # Parse wikitext quotes (italics & bold)
5081                 $text = $this->doQuotes( $text );
5082
5083                 # Strip HTML tags
5084                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5085                 return $text;
5086         }
5087
5088         function srvus( $text ) {
5089                 return $this->testSrvus( $text, $this->mOutputType );
5090         }
5091
5092         /**
5093          * strip/replaceVariables/unstrip for preprocessor regression testing
5094          */
5095         function testSrvus( $text, $title, $options, $outputType = self::OT_HTML ) {
5096                 $this->clearState();
5097                 if ( !$title instanceof Title ) {
5098                         $title = Title::newFromText( $title );
5099                 }
5100                 $this->mTitle = $title;
5101                 $this->mOptions = $options;
5102                 $this->setOutputType( $outputType );
5103                 $text = $this->replaceVariables( $text );
5104                 $text = $this->mStripState->unstripBoth( $text );
5105                 $text = Sanitizer::removeHTMLtags( $text );
5106                 return $text;
5107         }
5108
5109         function testPst( $text, $title, $options ) {
5110                 global $wgUser;
5111                 if ( !$title instanceof Title ) {
5112                         $title = Title::newFromText( $title );
5113                 }
5114                 return $this->preSaveTransform( $text, $title, $wgUser, $options );
5115         }
5116
5117         function testPreprocess( $text, $title, $options ) {
5118                 if ( !$title instanceof Title ) {
5119                         $title = Title::newFromText( $title );
5120                 }
5121                 return $this->testSrvus( $text, $title, $options, self::OT_PREPROCESS );
5122         }
5123
5124         function markerSkipCallback( $s, $callback ) {
5125                 $i = 0;
5126                 $out = '';
5127                 while ( $i < strlen( $s ) ) {
5128                         $markerStart = strpos( $s, $this->mUniqPrefix, $i );
5129                         if ( $markerStart === false ) {
5130                                 $out .= call_user_func( $callback, substr( $s, $i ) );
5131                                 break;
5132                         } else {
5133                                 $out .= call_user_func( $callback, substr( $s, $i, $markerStart - $i ) );
5134                                 $markerEnd = strpos( $s, self::MARKER_SUFFIX, $markerStart );
5135                                 if ( $markerEnd === false ) {
5136                                         $out .= substr( $s, $markerStart );
5137                                         break;
5138                                 } else {
5139                                         $markerEnd += strlen( self::MARKER_SUFFIX );
5140                                         $out .= substr( $s, $markerStart, $markerEnd - $markerStart );
5141                                         $i = $markerEnd;
5142                                 }
5143                         }
5144                 }
5145                 return $out;
5146         }
5147
5148         function serialiseHalfParsedText( $text ) {
5149                 $data = array();
5150                 $data['text'] = $text;
5151
5152                 # First, find all strip markers, and store their
5153                 #  data in an array.
5154                 $stripState = new StripState;
5155                 $pos = 0;
5156                 while ( ( $start_pos = strpos( $text, $this->mUniqPrefix, $pos ) )
5157                         && ( $end_pos = strpos( $text, self::MARKER_SUFFIX, $pos ) ) )
5158                 {
5159                         $end_pos += strlen( self::MARKER_SUFFIX );
5160                         $marker = substr( $text, $start_pos, $end_pos-$start_pos );
5161
5162                         if ( !empty( $this->mStripState->general->data[$marker] ) ) {
5163                                 $replaceArray = $stripState->general;
5164                                 $stripText = $this->mStripState->general->data[$marker];
5165                         } elseif ( !empty( $this->mStripState->nowiki->data[$marker] ) ) {
5166                                 $replaceArray = $stripState->nowiki;
5167                                 $stripText = $this->mStripState->nowiki->data[$marker];
5168                         } else {
5169                                 throw new MWException( "Hanging strip marker: '$marker'." );
5170                         }
5171
5172                         $replaceArray->setPair( $marker, $stripText );
5173                         $pos = $end_pos;
5174                 }
5175                 $data['stripstate'] = $stripState;
5176
5177                 # Now, find all of our links, and store THEIR
5178                 #  data in an array! :)
5179                 $links = array( 'internal' => array(), 'interwiki' => array() );
5180                 $pos = 0;
5181
5182                 # Internal links
5183                 while ( ( $start_pos = strpos( $text, '<!--LINK ', $pos ) ) ) {
5184                         list( $ns, $trail ) = explode( ':', substr( $text, $start_pos + strlen( '<!--LINK ' ) ), 2 );
5185
5186                         $ns = trim( $ns );
5187                         if ( empty( $links['internal'][$ns] ) ) {
5188                                 $links['internal'][$ns] = array();
5189                         }
5190
5191                         $key = trim( substr( $trail, 0, strpos( $trail, '-->' ) ) );
5192                         $links['internal'][$ns][] = $this->mLinkHolders->internals[$ns][$key];
5193                         $pos = $start_pos + strlen( "<!--LINK $ns:$key-->" );
5194                 }
5195
5196                 $pos = 0;
5197
5198                 # Interwiki links
5199                 while ( ( $start_pos = strpos( $text, '<!--IWLINK ', $pos ) ) ) {
5200                         $data = substr( $text, $start_pos );
5201                         $key = trim( substr( $data, 0, strpos( $data, '-->' ) ) );
5202                         $links['interwiki'][] = $this->mLinkHolders->interwiki[$key];
5203                         $pos = $start_pos + strlen( "<!--IWLINK $key-->" );
5204                 }
5205
5206                 $data['linkholder'] = $links;
5207
5208                 return $data;
5209         }
5210
5211         /**
5212          * TODO: document
5213          * @param $data Array
5214          * @param $intPrefix String unique identifying prefix
5215          * @return String
5216          */
5217         function unserialiseHalfParsedText( $data, $intPrefix = null ) {
5218                 if ( !$intPrefix ) {
5219                         $intPrefix = $this->getRandomString();
5220                 }
5221
5222                 # First, extract the strip state.
5223                 $stripState = $data['stripstate'];
5224                 $this->mStripState->general->merge( $stripState->general );
5225                 $this->mStripState->nowiki->merge( $stripState->nowiki );
5226
5227                 # Now, extract the text, and renumber links
5228                 $text = $data['text'];
5229                 $links = $data['linkholder'];
5230
5231                 # Internal...
5232                 foreach ( $links['internal'] as $ns => $nsLinks ) {
5233                         foreach ( $nsLinks as $key => $entry ) {
5234                                 $newKey = $intPrefix . '-' . $key;
5235                                 $this->mLinkHolders->internals[$ns][$newKey] = $entry;
5236
5237                                 $text = str_replace( "<!--LINK $ns:$key-->", "<!--LINK $ns:$newKey-->", $text );
5238                         }
5239                 }
5240
5241                 # Interwiki...
5242                 foreach ( $links['interwiki'] as $key => $entry ) {
5243                         $newKey = "$intPrefix-$key";
5244                         $this->mLinkHolders->interwikis[$newKey] = $entry;
5245
5246                         $text = str_replace( "<!--IWLINK $key-->", "<!--IWLINK $newKey-->", $text );
5247                 }
5248
5249                 # Should be good to go.
5250                 return $text;
5251         }
5252 }
5253
5254 /**
5255  * @todo document, briefly.
5256  * @ingroup Parser
5257  */
5258 class StripState {
5259         var $general, $nowiki;
5260
5261         function __construct() {
5262                 $this->general = new ReplacementArray;
5263                 $this->nowiki = new ReplacementArray;
5264         }
5265
5266         function unstripGeneral( $text ) {
5267                 wfProfileIn( __METHOD__ );
5268                 do {
5269                         $oldText = $text;
5270                         $text = $this->general->replace( $text );
5271                 } while ( $text !== $oldText );
5272                 wfProfileOut( __METHOD__ );
5273                 return $text;
5274         }
5275
5276         function unstripNoWiki( $text ) {
5277                 wfProfileIn( __METHOD__ );
5278                 do {
5279                         $oldText = $text;
5280                         $text = $this->nowiki->replace( $text );
5281                 } while ( $text !== $oldText );
5282                 wfProfileOut( __METHOD__ );
5283                 return $text;
5284         }
5285
5286         function unstripBoth( $text ) {
5287                 wfProfileIn( __METHOD__ );
5288                 do {
5289                         $oldText = $text;
5290                         $text = $this->general->replace( $text );
5291                         $text = $this->nowiki->replace( $text );
5292                 } while ( $text !== $oldText );
5293                 wfProfileOut( __METHOD__ );
5294                 return $text;
5295         }
5296 }
5297
5298 /**
5299  * @todo document, briefly.
5300  * @ingroup Parser
5301  */
5302 class OnlyIncludeReplacer {
5303         var $output = '';
5304
5305         function replace( $matches ) {
5306                 if ( substr( $matches[1], -1 ) === "\n" ) {
5307                         $this->output .= substr( $matches[1], 0, -1 );
5308                 } else {
5309                         $this->output .= $matches[1];
5310                 }
5311         }
5312 }