includes/Parser.php

   1 <?php
   2
   3 /**
   4  *
   5  * File for Parser and related classes
   6  *
   7  * @addtogroup Parser
   8  */
   9
  10
  11 /**
  12  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  13  * syntax, such as "[[link]]" for making links), and provides a one-way
  14  * transformation of that wiki markup it into XHTML output / markup
  15  * (which in turn the browser understands, and can display).
  16  *
  17  * <pre>
  18  * There are five main entry points into the Parser class:
  19  * parse()
  20  *   produces HTML output
  21  * preSaveTransform().
  22  *   produces altered wiki markup.
  23  * preprocess()
  24  *   removes HTML comments and expands templates
  25  * cleanSig()
  26  *   Cleans a signature before saving it to preferences
  27  * extractSections()
  28  *   Extracts sections from an article for section editing
  29  *
  30  * Globals used:
  31  *    objects:   $wgLang, $wgContLang
  32  *
  33  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  34  *
  35  * settings:
  36  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  37  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  38  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  39  *  $wgMaxArticleSize*
  40  *
  41  *  * only within ParserOptions
  42  * </pre>
  43  *
  44  * @addtogroup Parser
  45  */
  46 class Parser
  47 {
  48         /**
  49          * Update this version number when the ParserOutput format
  50          * changes in an incompatible way, so the parser cache
  51          * can automatically discard old data.
  52          */
  53         const VERSION = '1.6.4';
  54
  55         # Flags for Parser::setFunctionHook
  56         # Also available as global constants from Defines.php
  57         const SFH_NO_HASH = 1;
  58         const SFH_OBJECT_ARGS = 2;
  59
  60         # Constants needed for external link processing
  61         # Everything except bracket, space, or control characters
  62         const EXT_LINK_URL_CLASS = '[^][<>"\\x00-\\x20\\x7F]';
  63         const EXT_IMAGE_REGEX = '/^(http:\/\/|https:\/\/)([^][<>"\\x00-\\x20\\x7F]+)
  64                 \\/([A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]+)\\.((?i)gif|png|jpg|jpeg)$/Sx';
  65
  66         // State constants for the definition list colon extraction
  67         const COLON_STATE_TEXT = 0;
  68         const COLON_STATE_TAG = 1;
  69         const COLON_STATE_TAGSTART = 2;
  70         const COLON_STATE_CLOSETAG = 3;
  71         const COLON_STATE_TAGSLASH = 4;
  72         const COLON_STATE_COMMENT = 5;
  73         const COLON_STATE_COMMENTDASH = 6;
  74         const COLON_STATE_COMMENTDASHDASH = 7;
  75
  76         // Flags for preprocessToDom
  77         const PTD_FOR_INCLUSION = 1;
  78
  79         /**#@+
  80          * @private
  81          */
  82         # Persistent:
  83         var $mTagHooks, $mTransparentTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables,
  84                 $mImageParams, $mImageParamsMagicArray, $mStripList, $mMarkerSuffix,
  85                 $mExtLinkBracketedRegex;
  86
  87         # Cleared with clearState():
  88         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
  89         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
  90         var $mInterwikiLinkHolders, $mLinkHolders;
  91         var $mIncludeSizes, $mPPNodeCount, $mDefaultSort;
  92         var $mTplExpandCache; // empty-frame expansion cache
  93         var $mTplRedirCache, $mTplDomCache, $mHeadings;
  94
  95         # Temporary
  96         # These are variables reset at least once per parse regardless of $clearState
  97         var $mOptions,      // ParserOptions object
  98                 $mTitle,        // Title context, used for self-link rendering and similar things
  99                 $mOutputType,   // Output type, one of the OT_xxx constants
 100                 $ot,            // Shortcut alias, see setOutputType()
 101                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 102                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 103                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 104
 105         /**#@-*/
 106
 107         /**
 108          * Constructor
 109          *
 110          * @public
 111          */
 112         function __construct( $conf = array() ) {
 113                 $this->mTagHooks = array();
 114                 $this->mTransparentTagHooks = array();
 115                 $this->mFunctionHooks = array();
 116                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 117                 $this->mStripList = array( 'nowiki', 'gallery' );
 118                 $this->mMarkerSuffix = "-QINU\x7f";
 119                 $this->mExtLinkBracketedRegex = '/\[(\b(' . wfUrlProtocols() . ')'.
 120                         '[^][<>"\\x00-\\x20\\x7F]+) *([^\]\\x0a\\x0d]*?)\]/S';
 121                 $this->mFirstCall = true;
 122         }
 123
 124         /**
 125          * Do various kinds of initialisation on the first call of the parser
 126          */
 127         function firstCallInit() {
 128                 if ( !$this->mFirstCall ) {
 129                         return;
 130                 }
 131                 $this->mFirstCall = false;
 132
 133                 wfProfileIn( __METHOD__ );
 134                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 135
 136                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 137
 138                 # Syntax for arguments (see self::setFunctionHook):
 139                 #  "name for lookup in localized magic words array",
 140                 #  function callback,
 141                 #  optional SFH_NO_HASH to omit the hash from calls (e.g. {{int:...}
 142                 #    instead of {{#int:...}})
 143                 $this->setFunctionHook( 'int',              array( 'CoreParserFunctions', 'intFunction'      ), SFH_NO_HASH );
 144                 $this->setFunctionHook( 'ns',               array( 'CoreParserFunctions', 'ns'               ), SFH_NO_HASH );
 145                 $this->setFunctionHook( 'urlencode',        array( 'CoreParserFunctions', 'urlencode'        ), SFH_NO_HASH );
 146                 $this->setFunctionHook( 'lcfirst',          array( 'CoreParserFunctions', 'lcfirst'          ), SFH_NO_HASH );
 147                 $this->setFunctionHook( 'ucfirst',          array( 'CoreParserFunctions', 'ucfirst'          ), SFH_NO_HASH );
 148                 $this->setFunctionHook( 'lc',               array( 'CoreParserFunctions', 'lc'               ), SFH_NO_HASH );
 149                 $this->setFunctionHook( 'uc',               array( 'CoreParserFunctions', 'uc'               ), SFH_NO_HASH );
 150                 $this->setFunctionHook( 'localurl',         array( 'CoreParserFunctions', 'localurl'         ), SFH_NO_HASH );
 151                 $this->setFunctionHook( 'localurle',        array( 'CoreParserFunctions', 'localurle'        ), SFH_NO_HASH );
 152                 $this->setFunctionHook( 'fullurl',          array( 'CoreParserFunctions', 'fullurl'          ), SFH_NO_HASH );
 153                 $this->setFunctionHook( 'fullurle',         array( 'CoreParserFunctions', 'fullurle'         ), SFH_NO_HASH );
 154                 $this->setFunctionHook( 'formatnum',        array( 'CoreParserFunctions', 'formatnum'        ), SFH_NO_HASH );
 155                 $this->setFunctionHook( 'grammar',          array( 'CoreParserFunctions', 'grammar'          ), SFH_NO_HASH );
 156                 $this->setFunctionHook( 'plural',           array( 'CoreParserFunctions', 'plural'           ), SFH_NO_HASH );
 157                 $this->setFunctionHook( 'numberofpages',    array( 'CoreParserFunctions', 'numberofpages'    ), SFH_NO_HASH );
 158                 $this->setFunctionHook( 'numberofusers',    array( 'CoreParserFunctions', 'numberofusers'    ), SFH_NO_HASH );
 159                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'numberoffiles',    array( 'CoreParserFunctions', 'numberoffiles'    ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'numberofadmins',   array( 'CoreParserFunctions', 'numberofadmins'   ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'numberofedits',    array( 'CoreParserFunctions', 'numberofedits'    ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'language',         array( 'CoreParserFunctions', 'language'         ), SFH_NO_HASH );
 164                 $this->setFunctionHook( 'padleft',          array( 'CoreParserFunctions', 'padleft'          ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'padright',         array( 'CoreParserFunctions', 'padright'         ), SFH_NO_HASH );
 166                 $this->setFunctionHook( 'anchorencode',     array( 'CoreParserFunctions', 'anchorencode'     ), SFH_NO_HASH );
 167                 $this->setFunctionHook( 'special',          array( 'CoreParserFunctions', 'special'          ) );
 168                 $this->setFunctionHook( 'defaultsort',      array( 'CoreParserFunctions', 'defaultsort'      ), SFH_NO_HASH );
 169                 $this->setFunctionHook( 'filepath',         array( 'CoreParserFunctions', 'filepath'         ), SFH_NO_HASH );
 170                 $this->setFunctionHook( 'tag',              array( 'CoreParserFunctions', 'tagObj'           ), SFH_OBJECT_ARGS );
 171
 172                 if ( $wgAllowDisplayTitle ) {
 173                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 174                 }
 175                 if ( $wgAllowSlowParserFunctions ) {
 176                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 177                 }
 178
 179                 $this->initialiseVariables();
 180
 181                 wfRunHooks( 'ParserFirstCallInit', array( &$this ) );
 182                 wfProfileOut( __METHOD__ );
 183         }
 184
 185         /**
 186          * Clear Parser state
 187          *
 188          * @private
 189          */
 190         function clearState() {
 191                 wfProfileIn( __METHOD__ );
 192                 if ( $this->mFirstCall ) {
 193                         $this->firstCallInit();
 194                 }
 195                 $this->mOutput = new ParserOutput;
 196                 $this->mAutonumber = 0;
 197                 $this->mLastSection = '';
 198                 $this->mDTopen = false;
 199                 $this->mIncludeCount = array();
 200                 $this->mStripState = new StripState;
 201                 $this->mArgStack = false;
 202                 $this->mInPre = false;
 203                 $this->mInterwikiLinkHolders = array(
 204                         'texts' => array(),
 205                         'titles' => array()
 206                 );
 207                 $this->mLinkHolders = array(
 208                         'namespaces' => array(),
 209                         'dbkeys' => array(),
 210                         'queries' => array(),
 211                         'texts' => array(),
 212                         'titles' => array()
 213                 );
 214                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 215
 216                 /**
 217                  * Prefix for temporary replacement strings for the multipass parser.
 218                  * \x07 should never appear in input as it's disallowed in XML.
 219                  * Using it at the front also gives us a little extra robustness
 220                  * since it shouldn't match when butted up against identifier-like
 221                  * string constructs.
 222                  *
 223                  * Must not consist of all title characters, or else it will change
 224                  * the behaviour of <nowiki> in a link.
 225                  */
 226                 #$this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 227                 $this->mUniqPrefix = "\x7fUNIQ" . Parser::getRandomString();
 228
 229                 # Clear these on every parse, bug 4549
 230                 $this->mTplExpandCache = $this->mTplRedirCache = $this->mTplDomCache = array();
 231
 232                 $this->mShowToc = true;
 233                 $this->mForceTocPosition = false;
 234                 $this->mIncludeSizes = array(
 235                         'post-expand' => 0,
 236                         'arg' => 0,
 237                 );
 238                 $this->mPPNodeCount = 0;
 239                 $this->mDefaultSort = false;
 240                 $this->mHeadings = array();
 241
 242                 wfRunHooks( 'ParserClearState', array( &$this ) );
 243                 wfProfileOut( __METHOD__ );
 244         }
 245
 246         function setOutputType( $ot ) {
 247                 $this->mOutputType = $ot;
 248                 // Shortcut alias
 249                 $this->ot = array(
 250                         'html' => $ot == OT_HTML,
 251                         'wiki' => $ot == OT_WIKI,
 252                         'pre' => $ot == OT_PREPROCESS,
 253                 );
 254         }
 255
 256         /**
 257          * Set the context title
 258          */
 259         function setTitle( $t ) {
 260                 if ( !$t || $t instanceof FakeTitle ) {
 261                         $t = Title::newFromText( 'NO TITLE' );
 262                 }
 263                 if ( strval( $t->getFragment() ) !== '' ) {
 264                         # Strip the fragment to avoid various odd effects
 265                         $this->mTitle = clone $t;
 266                         $this->mTitle->setFragment( '' );
 267                 } else {
 268                         $this->mTitle = $t;
 269                 }
 270         }
 271
 272         /**
 273          * Accessor for mUniqPrefix.
 274          *
 275          * @public
 276          */
 277         function uniqPrefix() {
 278                 if( !isset( $this->mUniqPrefix ) ) {
 279                         // @fixme this is probably *horribly wrong*
 280                         // LanguageConverter seems to want $wgParser's uniqPrefix, however
 281                         // if this is called for a parser cache hit, the parser may not
 282                         // have ever been initialized in the first place.
 283                         // Not really sure what the heck is supposed to be going on here.
 284                         return '';
 285                         //throw new MWException( "Accessing uninitialized mUniqPrefix" );
 286                 }
 287                 return $this->mUniqPrefix;
 288         }
 289
 290         /**
 291          * Convert wikitext to HTML
 292          * Do not call this function recursively.
 293          *
 294          * @param string $text Text we want to parse
 295          * @param Title &$title A title object
 296          * @param array $options
 297          * @param boolean $linestart
 298          * @param boolean $clearState
 299          * @param int $revid number to pass in {{REVISIONID}}
 300          * @return ParserOutput a ParserOutput
 301          */
 302         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 303                 /**
 304                  * First pass--just handle <nowiki> sections, pass the rest off
 305                  * to internalParse() which does all the real work.
 306                  */
 307
 308                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 309                 $fname = 'Parser::parse-' . wfGetCaller();
 310                 wfProfileIn( __METHOD__ );
 311                 wfProfileIn( $fname );
 312
 313                 if ( $clearState ) {
 314                         $this->clearState();
 315                 }
 316
 317                 $this->mOptions = $options;
 318                 $this->setTitle( $title );
 319                 $oldRevisionId = $this->mRevisionId;
 320                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 321                 if( $revid !== null ) {
 322                         $this->mRevisionId = $revid;
 323                         $this->mRevisionTimestamp = null;
 324                 }
 325                 $this->setOutputType( OT_HTML );
 326                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 327                 # No more strip!
 328                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 329                 $text = $this->internalParse( $text );
 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                 );
 340                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 341
 342                 # only once and last
 343                 $text = $this->doBlockLevels( $text, $linestart );
 344
 345                 $this->replaceLinkHolders( $text );
 346
 347                 # the position of the parserConvert() call should not be changed. it
 348                 # assumes that the links are all replaced and the only thing left
 349                 # is the <nowiki> mark.
 350                 # Side-effects: this calls $this->mOutput->setTitleText()
 351                 $text = $wgContLang->parserConvert( $text, $this );
 352
 353                 $text = $this->mStripState->unstripNoWiki( $text );
 354
 355                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 356
 357 //!JF Move to its own function
 358
 359                 $uniq_prefix = $this->mUniqPrefix;
 360                 $matches = array();
 361                 $elements = array_keys( $this->mTransparentTagHooks );
 362                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 363
 364                 foreach( $matches as $marker => $data ) {
 365                         list( $element, $content, $params, $tag ) = $data;
 366                         $tagName = strtolower( $element );
 367                         if( isset( $this->mTransparentTagHooks[$tagName] ) ) {
 368                                 $output = call_user_func_array( $this->mTransparentTagHooks[$tagName],
 369                                         array( $content, $params, $this ) );
 370                         } else {
 371                                 $output = $tag;
 372                         }
 373                         $this->mStripState->general->setPair( $marker, $output );
 374                 }
 375                 $text = $this->mStripState->unstripGeneral( $text );
 376
 377                 $text = Sanitizer::normalizeCharReferences( $text );
 378
 379                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 380                         $text = Parser::tidy($text);
 381                 } else {
 382                         # attempt to sanitize at least some nesting problems
 383                         # (bug #2702 and quite a few others)
 384                         $tidyregs = array(
 385                                 # ''Something [http://www.cool.com cool''] -->
 386                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 387                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 388                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 389                                 # fix up an anchor inside another anchor, only
 390                                 # at least for a single single nested link (bug 3695)
 391                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 392                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 393                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 394                                 # contains a div, so fix it up here; replace
 395                                 # div with escaped text
 396                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 397                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 398                                 # remove empty italic or bold tag pairs, some
 399                                 # introduced by rules above
 400                                 '/<([bi])><\/\\1>/' => '',
 401                         );
 402
 403                         $text = preg_replace(
 404                                 array_keys( $tidyregs ),
 405                                 array_values( $tidyregs ),
 406                                 $text );
 407                 }
 408
 409                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 410
 411                 # Information on include size limits, for the benefit of users who try to skirt them
 412                 if ( $this->mOptions->getEnableLimitReport() ) {
 413                         $max = $this->mOptions->getMaxIncludeSize();
 414                         $limitReport =
 415                                 "NewPP limit report\n" .
 416                                 "Preprocessor node count: {$this->mPPNodeCount}/{$this->mOptions->mMaxPPNodeCount}\n" .
 417                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']}/$max bytes\n" .
 418                                 "Template argument size: {$this->mIncludeSizes['arg']}/$max bytes\n";
 419                         wfRunHooks( 'ParserLimitReport', array( $this, &$limitReport ) );
 420                         $text .= "\n<!-- \n$limitReport-->\n";
 421                 }
 422                 $this->mOutput->setText( $text );
 423                 $this->mRevisionId = $oldRevisionId;
 424                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 425                 wfProfileOut( $fname );
 426                 wfProfileOut( __METHOD__ );
 427
 428                 return $this->mOutput;
 429         }
 430
 431         /**
 432          * Recursive parser entry point that can be called from an extension tag
 433          * hook.
 434          */
 435         function recursiveTagParse( $text ) {
 436                 wfProfileIn( __METHOD__ );
 437                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 438                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 439                 $text = $this->internalParse( $text );
 440                 wfProfileOut( __METHOD__ );
 441                 return $text;
 442         }
 443
 444         /**
 445          * Expand templates and variables in the text, producing valid, static wikitext.
 446          * Also removes comments.
 447          */
 448         function preprocess( $text, $title, $options, $revid = null ) {
 449                 wfProfileIn( __METHOD__ );
 450                 $this->clearState();
 451                 $this->setOutputType( OT_PREPROCESS );
 452                 $this->mOptions = $options;
 453                 $this->setTitle( $title );
 454                 if( $revid !== null ) {
 455                         $this->mRevisionId = $revid;
 456                 }
 457                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 458                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 459                 $text = $this->replaceVariables( $text );
 460                 $text = $this->mStripState->unstripBoth( $text );
 461                 wfProfileOut( __METHOD__ );
 462                 return $text;
 463         }
 464
 465         /**
 466          * Get a random string
 467          *
 468          * @private
 469          * @static
 470          */
 471         function getRandomString() {
 472                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 473         }
 474
 475         function &getTitle() { return $this->mTitle; }
 476         function getOptions() { return $this->mOptions; }
 477
 478         function getFunctionLang() {
 479                 global $wgLang, $wgContLang;
 480                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 481         }
 482
 483         /**
 484          * Replaces all occurrences of HTML-style comments and the given tags
 485          * in the text with a random marker and returns teh next text. The output
 486          * parameter $matches will be an associative array filled with data in
 487          * the form:
 488          *   'UNIQ-xxxxx' => array(
 489          *     'element',
 490          *     'tag content',
 491          *     array( 'param' => 'x' ),
 492          *     '<element param="x">tag content</element>' ) )
 493          *
 494          * @param $elements list of element names. Comments are always extracted.
 495          * @param $text Source text string.
 496          * @param $uniq_prefix
 497          *
 498          * @public
 499          * @static
 500          */
 501         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 502                 static $n = 1;
 503                 $stripped = '';
 504                 $matches = array();
 505
 506                 $taglist = implode( '|', $elements );
 507                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 508
 509                 while ( '' != $text ) {
 510                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 511                         $stripped .= $p[0];
 512                         if( count( $p ) < 5 ) {
 513                                 break;
 514                         }
 515                         if( count( $p ) > 5 ) {
 516                                 // comment
 517                                 $element    = $p[4];
 518                                 $attributes = '';
 519                                 $close      = '';
 520                                 $inside     = $p[5];
 521                         } else {
 522                                 // tag
 523                                 $element    = $p[1];
 524                                 $attributes = $p[2];
 525                                 $close      = $p[3];
 526                                 $inside     = $p[4];
 527                         }
 528
 529                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
 530                         $stripped .= $marker;
 531
 532                         if ( $close === '/>' ) {
 533                                 // Empty element tag, <tag />
 534                                 $content = null;
 535                                 $text = $inside;
 536                                 $tail = null;
 537                         } else {
 538                                 if( $element == '!--' ) {
 539                                         $end = '/(-->)/';
 540                                 } else {
 541                                         $end = "/(<\\/$element\\s*>)/i";
 542                                 }
 543                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 544                                 $content = $q[0];
 545                                 if( count( $q ) < 3 ) {
 546                                         # No end tag -- let it run out to the end of the text.
 547                                         $tail = '';
 548                                         $text = '';
 549                                 } else {
 550                                         $tail = $q[1];
 551                                         $text = $q[2];
 552                                 }
 553                         }
 554
 555                         $matches[$marker] = array( $element,
 556                                 $content,
 557                                 Sanitizer::decodeTagAttributes( $attributes ),
 558                                 "<$element$attributes$close$content$tail" );
 559                 }
 560                 return $stripped;
 561         }
 562
 563         /**
 564          * Get a list of strippable XML-like elements
 565          */
 566         function getStripList() {
 567                 global $wgRawHtml;
 568                 $elements = $this->mStripList;
 569                 if( $wgRawHtml ) {
 570                         $elements[] = 'html';
 571                 }
 572                 if( $this->mOptions->getUseTeX() ) {
 573                         $elements[] = 'math';
 574                 }
 575                 return $elements;
 576         }
 577
 578         /**
 579          * @deprecated use replaceVariables
 580          */
 581         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 582                 return $text;
 583         }
 584
 585         /**
 586          * Restores pre, math, and other extensions removed by strip()
 587          *
 588          * always call unstripNoWiki() after this one
 589          * @private
 590          * @deprecated use $this->mStripState->unstrip()
 591          */
 592         function unstrip( $text, $state ) {
 593                 return $state->unstripGeneral( $text );
 594         }
 595
 596         /**
 597          * Always call this after unstrip() to preserve the order
 598          *
 599          * @private
 600          * @deprecated use $this->mStripState->unstrip()
 601          */
 602         function unstripNoWiki( $text, $state ) {
 603                 return $state->unstripNoWiki( $text );
 604         }
 605
 606         /**
 607          * @deprecated use $this->mStripState->unstripBoth()
 608          */
 609         function unstripForHTML( $text ) {
 610                 return $this->mStripState->unstripBoth( $text );
 611         }
 612
 613         /**
 614          * Add an item to the strip state
 615          * Returns the unique tag which must be inserted into the stripped text
 616          * The tag will be replaced with the original text in unstrip()
 617          *
 618          * @private
 619          */
 620         function insertStripItem( $text ) {
 621                 static $n = 0;
 622                 $rnd = "{$this->mUniqPrefix}-item-$n-{$this->mMarkerSuffix}";
 623                 ++$n;
 624                 $this->mStripState->general->setPair( $rnd, $text );
 625                 return $rnd;
 626         }
 627
 628         /**
 629          * Interface with html tidy, used if $wgUseTidy = true.
 630          * If tidy isn't able to correct the markup, the original will be
 631          * returned in all its glory with a warning comment appended.
 632          *
 633          * Either the external tidy program or the in-process tidy extension
 634          * will be used depending on availability. Override the default
 635          * $wgTidyInternal setting to disable the internal if it's not working.
 636          *
 637          * @param string $text Hideous HTML input
 638          * @return string Corrected HTML output
 639          * @public
 640          * @static
 641          */
 642         function tidy( $text ) {
 643                 global $wgTidyInternal;
 644                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 645 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 646 '<head><title>test</title></head><body>'.$text.'</body></html>';
 647                 if( $wgTidyInternal ) {
 648                         $correctedtext = Parser::internalTidy( $wrappedtext );
 649                 } else {
 650                         $correctedtext = Parser::externalTidy( $wrappedtext );
 651                 }
 652                 if( is_null( $correctedtext ) ) {
 653                         wfDebug( "Tidy error detected!\n" );
 654                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 655                 }
 656                 return $correctedtext;
 657         }
 658
 659         /**
 660          * Spawn an external HTML tidy process and get corrected markup back from it.
 661          *
 662          * @private
 663          * @static
 664          */
 665         function externalTidy( $text ) {
 666                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 667                 $fname = 'Parser::externalTidy';
 668                 wfProfileIn( $fname );
 669
 670                 $cleansource = '';
 671                 $opts = ' -utf8';
 672
 673                 $descriptorspec = array(
 674                         0 => array('pipe', 'r'),
 675                         1 => array('pipe', 'w'),
 676                         2 => array('file', wfGetNull(), 'a')
 677                 );
 678                 $pipes = array();
 679                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 680                 if (is_resource($process)) {
 681                         // Theoretically, this style of communication could cause a deadlock
 682                         // here. If the stdout buffer fills up, then writes to stdin could
 683                         // block. This doesn't appear to happen with tidy, because tidy only
 684                         // writes to stdout after it's finished reading from stdin. Search
 685                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 686                         fwrite($pipes[0], $text);
 687                         fclose($pipes[0]);
 688                         while (!feof($pipes[1])) {
 689                                 $cleansource .= fgets($pipes[1], 1024);
 690                         }
 691                         fclose($pipes[1]);
 692                         proc_close($process);
 693                 }
 694
 695                 wfProfileOut( $fname );
 696
 697                 if( $cleansource == '' && $text != '') {
 698                         // Some kind of error happened, so we couldn't get the corrected text.
 699                         // Just give up; we'll use the source text and append a warning.
 700                         return null;
 701                 } else {
 702                         return $cleansource;
 703                 }
 704         }
 705
 706         /**
 707          * Use the HTML tidy PECL extension to use the tidy library in-process,
 708          * saving the overhead of spawning a new process.
 709          *
 710          * 'pear install tidy' should be able to compile the extension module.
 711          *
 712          * @private
 713          * @static
 714          */
 715         function internalTidy( $text ) {
 716                 global $wgTidyConf, $IP, $wgDebugTidy;
 717                 $fname = 'Parser::internalTidy';
 718                 wfProfileIn( $fname );
 719
 720                 $tidy = new tidy;
 721                 $tidy->parseString( $text, $wgTidyConf, 'utf8' );
 722                 $tidy->cleanRepair();
 723                 if( $tidy->getStatus() == 2 ) {
 724                         // 2 is magic number for fatal error
 725                         // http://www.php.net/manual/en/function.tidy-get-status.php
 726                         $cleansource = null;
 727                 } else {
 728                         $cleansource = tidy_get_output( $tidy );
 729                 }
 730                 if ( $wgDebugTidy && $tidy->getStatus() > 0 ) {
 731                         $cleansource .= "<!--\nTidy reports:\n" .
 732                                 str_replace( '-->', '--&gt;', $tidy->errorBuffer ) .
 733                                 "\n-->";
 734                 }
 735
 736                 wfProfileOut( $fname );
 737                 return $cleansource;
 738         }
 739
 740         /**
 741          * parse the wiki syntax used to render tables
 742          *
 743          * @private
 744          */
 745         function doTableStuff ( $text ) {
 746                 $fname = 'Parser::doTableStuff';
 747                 wfProfileIn( $fname );
 748
 749                 $lines = explode ( "\n" , $text );
 750                 $td_history = array (); // Is currently a td tag open?
 751                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 752                 $tr_history = array (); // Is currently a tr tag open?
 753                 $tr_attributes = array (); // history of tr attributes
 754                 $has_opened_tr = array(); // Did this table open a <tr> element?
 755                 $indent_level = 0; // indent level of the table
 756                 foreach ( $lines as $key => $line )
 757                 {
 758                         $line = trim ( $line );
 759
 760                         if( $line == '' ) { // empty line, go to next line
 761                                 continue;
 762                         }
 763                         $first_character = $line{0};
 764                         $matches = array();
 765
 766                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 767                                 // First check if we are starting a new table
 768                                 $indent_level = strlen( $matches[1] );
 769
 770                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 771                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 772
 773                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 774                                 array_push ( $td_history , false );
 775                                 array_push ( $last_tag_history , '' );
 776                                 array_push ( $tr_history , false );
 777                                 array_push ( $tr_attributes , '' );
 778                                 array_push ( $has_opened_tr , false );
 779                         } else if ( count ( $td_history ) == 0 ) {
 780                                 // Don't do any of the following
 781                                 continue;
 782                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 783                                 // We are ending a table
 784                                 $line = '</table>' . substr ( $line , 2 );
 785                                 $last_tag = array_pop ( $last_tag_history );
 786
 787                                 if ( !array_pop ( $has_opened_tr ) ) {
 788                                         $line = "<tr><td></td></tr>{$line}";
 789                                 }
 790
 791                                 if ( array_pop ( $tr_history ) ) {
 792                                         $line = "</tr>{$line}";
 793                                 }
 794
 795                                 if ( array_pop ( $td_history ) ) {
 796                                         $line = "</{$last_tag}>{$line}";
 797                                 }
 798                                 array_pop ( $tr_attributes );
 799                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 800                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 801                                 // Now we have a table row
 802                                 $line = preg_replace( '#^\|-+#', '', $line );
 803
 804                                 // Whats after the tag is now only attributes
 805                                 $attributes = $this->mStripState->unstripBoth( $line );
 806                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 807                                 array_pop ( $tr_attributes );
 808                                 array_push ( $tr_attributes , $attributes );
 809
 810                                 $line = '';
 811                                 $last_tag = array_pop ( $last_tag_history );
 812                                 array_pop ( $has_opened_tr );
 813                                 array_push ( $has_opened_tr , true );
 814
 815                                 if ( array_pop ( $tr_history ) ) {
 816                                         $line = '</tr>';
 817                                 }
 818
 819                                 if ( array_pop ( $td_history ) ) {
 820                                         $line = "</{$last_tag}>{$line}";
 821                                 }
 822
 823                                 $lines[$key] = $line;
 824                                 array_push ( $tr_history , false );
 825                                 array_push ( $td_history , false );
 826                                 array_push ( $last_tag_history , '' );
 827                         }
 828                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 829                                 // This might be cell elements, td, th or captions
 830                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 831                                         $first_character = '+';
 832                                         $line = substr ( $line , 1 );
 833                                 }
 834
 835                                 $line = substr ( $line , 1 );
 836
 837                                 if ( $first_character == '!' ) {
 838                                         $line = str_replace ( '!!' , '||' , $line );
 839                                 }
 840
 841                                 // Split up multiple cells on the same line.
 842                                 // FIXME : This can result in improper nesting of tags processed
 843                                 // by earlier parser steps, but should avoid splitting up eg
 844                                 // attribute values containing literal "||".
 845                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 846
 847                                 $lines[$key] = '';
 848
 849                                 // Loop through each table cell
 850                                 foreach ( $cells as $cell )
 851                                 {
 852                                         $previous = '';
 853                                         if ( $first_character != '+' )
 854                                         {
 855                                                 $tr_after = array_pop ( $tr_attributes );
 856                                                 if ( !array_pop ( $tr_history ) ) {
 857                                                         $previous = "<tr{$tr_after}>\n";
 858                                                 }
 859                                                 array_push ( $tr_history , true );
 860                                                 array_push ( $tr_attributes , '' );
 861                                                 array_pop ( $has_opened_tr );
 862                                                 array_push ( $has_opened_tr , true );
 863                                         }
 864
 865                                         $last_tag = array_pop ( $last_tag_history );
 866
 867                                         if ( array_pop ( $td_history ) ) {
 868                                                 $previous = "</{$last_tag}>{$previous}";
 869                                         }
 870
 871                                         if ( $first_character == '|' ) {
 872                                                 $last_tag = 'td';
 873                                         } else if ( $first_character == '!' ) {
 874                                                 $last_tag = 'th';
 875                                         } else if ( $first_character == '+' ) {
 876                                                 $last_tag = 'caption';
 877                                         } else {
 878                                                 $last_tag = '';
 879                                         }
 880
 881                                         array_push ( $last_tag_history , $last_tag );
 882
 883                                         // A cell could contain both parameters and data
 884                                         $cell_data = explode ( '|' , $cell , 2 );
 885
 886                                         // Bug 553: Note that a '|' inside an invalid link should not
 887                                         // be mistaken as delimiting cell parameters
 888                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 889                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 890                                         } else if ( count ( $cell_data ) == 1 )
 891                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 892                                         else {
 893                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 894                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 895                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 896                                         }
 897
 898                                         $lines[$key] .= $cell;
 899                                         array_push ( $td_history , true );
 900                                 }
 901                         }
 902                 }
 903
 904                 // Closing open td, tr && table
 905                 while ( count ( $td_history ) > 0 )
 906                 {
 907                         if ( array_pop ( $td_history ) ) {
 908                                 $lines[] = '</td>' ;
 909                         }
 910                         if ( array_pop ( $tr_history ) ) {
 911                                 $lines[] = '</tr>' ;
 912                         }
 913                         if ( !array_pop ( $has_opened_tr ) ) {
 914                                 $lines[] = "<tr><td></td></tr>" ;
 915                         }
 916
 917                         $lines[] = '</table>' ;
 918                 }
 919
 920                 $output = implode ( "\n" , $lines ) ;
 921
 922                 // special case: don't return empty table
 923                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 924                         $output = '';
 925                 }
 926
 927                 wfProfileOut( $fname );
 928
 929                 return $output;
 930         }
 931
 932         /**
 933          * Helper function for parse() that transforms wiki markup into
 934          * HTML. Only called for $mOutputType == OT_HTML.
 935          *
 936          * @private
 937          */
 938         function internalParse( $text ) {
 939                 $isMain = true;
 940                 $fname = 'Parser::internalParse';
 941                 wfProfileIn( $fname );
 942
 943                 # Hook to suspend the parser in this state
 944                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 945                         wfProfileOut( $fname );
 946                         return $text ;
 947                 }
 948
 949                 $text = $this->replaceVariables( $text );
 950                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ), false, array_keys( $this->mTransparentTagHooks ) );
 951                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
 952
 953                 // Tables need to come after variable replacement for things to work
 954                 // properly; putting them before other transformations should keep
 955                 // exciting things like link expansions from showing up in surprising
 956                 // places.
 957                 $text = $this->doTableStuff( $text );
 958
 959                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
 960
 961                 $text = $this->stripToc( $text );
 962                 $this->stripNoGallery( $text );
 963                 $text = $this->doHeadings( $text );
 964                 if($this->mOptions->getUseDynamicDates()) {
 965                         $df =& DateFormatter::getInstance();
 966                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
 967                 }
 968                 $text = $this->doAllQuotes( $text );
 969                 $text = $this->replaceInternalLinks( $text );
 970                 $text = $this->replaceExternalLinks( $text );
 971
 972                 # replaceInternalLinks may sometimes leave behind
 973                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
 974                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
 975
 976                 $text = $this->doMagicLinks( $text );
 977                 $text = $this->formatHeadings( $text, $isMain );
 978
 979                 wfProfileOut( $fname );
 980                 return $text;
 981         }
 982
 983         /**
 984          * Replace special strings like "ISBN xxx" and "RFC xxx" with
 985          * magic external links.
 986          *
 987          * @private
 988          */
 989         function doMagicLinks( $text ) {
 990                 wfProfileIn( __METHOD__ );
 991                 $text = preg_replace_callback(
 992                         '!(?:                           # Start cases
 993                             <a.*?</a> |                 # Skip link text
 994                             <.*?> |                     # Skip stuff inside HTML elements
 995                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
 996                             ISBN\s+(\b                  # ISBN, capture number as m[2]
 997                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
 998                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
 999                                      [0-9Xx]                 # check digit
1000                                    \b)
1001                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1002                 wfProfileOut( __METHOD__ );
1003                 return $text;
1004         }
1005
1006         function magicLinkCallback( $m ) {
1007                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1008                         # Skip HTML element
1009                         return $m[0];
1010                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1011                         $isbn = $m[2];
1012                         $num = strtr( $isbn, array(
1013                                 '-' => '',
1014                                 ' ' => '',
1015                                 'x' => 'X',
1016                         ));
1017                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1018                         $text = '<a href="' .
1019                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1020                                 "\" class=\"internal\">ISBN $isbn</a>";
1021                 } else {
1022                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1023                                 $keyword = 'RFC';
1024                                 $urlmsg = 'rfcurl';
1025                                 $id = $m[1];
1026                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1027                                 $keyword = 'PMID';
1028                                 $urlmsg = 'pubmedurl';
1029                                 $id = $m[1];
1030                         } else {
1031                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1032                                         substr($m[0], 0, 20 ) . '"' );
1033                         }
1034
1035                         $url = wfMsg( $urlmsg, $id);
1036                         $sk = $this->mOptions->getSkin();
1037                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1038                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1039                 }
1040                 return $text;
1041         }
1042
1043         /**
1044          * Parse headers and return html
1045          *
1046          * @private
1047          */
1048         function doHeadings( $text ) {
1049                 $fname = 'Parser::doHeadings';
1050                 wfProfileIn( $fname );
1051                 for ( $i = 6; $i >= 1; --$i ) {
1052                         $h = str_repeat( '=', $i );
1053                         $text = preg_replace( "/^$h(.+)$h\\s*$/m",
1054                           "<h$i>\\1</h$i>", $text );
1055                 }
1056                 wfProfileOut( $fname );
1057                 return $text;
1058         }
1059
1060         /**
1061          * Replace single quotes with HTML markup
1062          * @private
1063          * @return string the altered text
1064          */
1065         function doAllQuotes( $text ) {
1066                 $fname = 'Parser::doAllQuotes';
1067                 wfProfileIn( $fname );
1068                 $outtext = '';
1069                 $lines = explode( "\n", $text );
1070                 foreach ( $lines as $line ) {
1071                         $outtext .= $this->doQuotes ( $line ) . "\n";
1072                 }
1073                 $outtext = substr($outtext, 0,-1);
1074                 wfProfileOut( $fname );
1075                 return $outtext;
1076         }
1077
1078         /**
1079          * Helper function for doAllQuotes()
1080          */
1081         public function doQuotes( $text ) {
1082                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1083                 if ( count( $arr ) == 1 )
1084                         return $text;
1085                 else
1086                 {
1087                         # First, do some preliminary work. This may shift some apostrophes from
1088                         # being mark-up to being text. It also counts the number of occurrences
1089                         # of bold and italics mark-ups.
1090                         $i = 0;
1091                         $numbold = 0;
1092                         $numitalics = 0;
1093                         foreach ( $arr as $r )
1094                         {
1095                                 if ( ( $i % 2 ) == 1 )
1096                                 {
1097                                         # If there are ever four apostrophes, assume the first is supposed to
1098                                         # be text, and the remaining three constitute mark-up for bold text.
1099                                         if ( strlen( $arr[$i] ) == 4 )
1100                                         {
1101                                                 $arr[$i-1] .= "'";
1102                                                 $arr[$i] = "'''";
1103                                         }
1104                                         # If there are more than 5 apostrophes in a row, assume they're all
1105                                         # text except for the last 5.
1106                                         else if ( strlen( $arr[$i] ) > 5 )
1107                                         {
1108                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1109                                                 $arr[$i] = "'''''";
1110                                         }
1111                                         # Count the number of occurrences of bold and italics mark-ups.
1112                                         # We are not counting sequences of five apostrophes.
1113                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1114                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1115                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1116                                 }
1117                                 $i++;
1118                         }
1119
1120                         # If there is an odd number of both bold and italics, it is likely
1121                         # that one of the bold ones was meant to be an apostrophe followed
1122                         # by italics. Which one we cannot know for certain, but it is more
1123                         # likely to be one that has a single-letter word before it.
1124                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1125                         {
1126                                 $i = 0;
1127                                 $firstsingleletterword = -1;
1128                                 $firstmultiletterword = -1;
1129                                 $firstspace = -1;
1130                                 foreach ( $arr as $r )
1131                                 {
1132                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1133                                         {
1134                                                 $x1 = substr ($arr[$i-1], -1);
1135                                                 $x2 = substr ($arr[$i-1], -2, 1);
1136                                                 if ($x1 == ' ') {
1137                                                         if ($firstspace == -1) $firstspace = $i;
1138                                                 } else if ($x2 == ' ') {
1139                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1140                                                 } else {
1141                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1142                                                 }
1143                                         }
1144                                         $i++;
1145                                 }
1146
1147                                 # If there is a single-letter word, use it!
1148                                 if ($firstsingleletterword > -1)
1149                                 {
1150                                         $arr [ $firstsingleletterword ] = "''";
1151                                         $arr [ $firstsingleletterword-1 ] .= "'";
1152                                 }
1153                                 # If not, but there's a multi-letter word, use that one.
1154                                 else if ($firstmultiletterword > -1)
1155                                 {
1156                                         $arr [ $firstmultiletterword ] = "''";
1157                                         $arr [ $firstmultiletterword-1 ] .= "'";
1158                                 }
1159                                 # ... otherwise use the first one that has neither.
1160                                 # (notice that it is possible for all three to be -1 if, for example,
1161                                 # there is only one pentuple-apostrophe in the line)
1162                                 else if ($firstspace > -1)
1163                                 {
1164                                         $arr [ $firstspace ] = "''";
1165                                         $arr [ $firstspace-1 ] .= "'";
1166                                 }
1167                         }
1168
1169                         # Now let's actually convert our apostrophic mush to HTML!
1170                         $output = '';
1171                         $buffer = '';
1172                         $state = '';
1173                         $i = 0;
1174                         foreach ($arr as $r)
1175                         {
1176                                 if (($i % 2) == 0)
1177                                 {
1178                                         if ($state == 'both')
1179                                                 $buffer .= $r;
1180                                         else
1181                                                 $output .= $r;
1182                                 }
1183                                 else
1184                                 {
1185                                         if (strlen ($r) == 2)
1186                                         {
1187                                                 if ($state == 'i')
1188                                                 { $output .= '</i>'; $state = ''; }
1189                                                 else if ($state == 'bi')
1190                                                 { $output .= '</i>'; $state = 'b'; }
1191                                                 else if ($state == 'ib')
1192                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1193                                                 else if ($state == 'both')
1194                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1195                                                 else # $state can be 'b' or ''
1196                                                 { $output .= '<i>'; $state .= 'i'; }
1197                                         }
1198                                         else if (strlen ($r) == 3)
1199                                         {
1200                                                 if ($state == 'b')
1201                                                 { $output .= '</b>'; $state = ''; }
1202                                                 else if ($state == 'bi')
1203                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1204                                                 else if ($state == 'ib')
1205                                                 { $output .= '</b>'; $state = 'i'; }
1206                                                 else if ($state == 'both')
1207                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1208                                                 else # $state can be 'i' or ''
1209                                                 { $output .= '<b>'; $state .= 'b'; }
1210                                         }
1211                                         else if (strlen ($r) == 5)
1212                                         {
1213                                                 if ($state == 'b')
1214                                                 { $output .= '</b><i>'; $state = 'i'; }
1215                                                 else if ($state == 'i')
1216                                                 { $output .= '</i><b>'; $state = 'b'; }
1217                                                 else if ($state == 'bi')
1218                                                 { $output .= '</i></b>'; $state = ''; }
1219                                                 else if ($state == 'ib')
1220                                                 { $output .= '</b></i>'; $state = ''; }
1221                                                 else if ($state == 'both')
1222                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1223                                                 else # ($state == '')
1224                                                 { $buffer = ''; $state = 'both'; }
1225                                         }
1226                                 }
1227                                 $i++;
1228                         }
1229                         # Now close all remaining tags.  Notice that the order is important.
1230                         if ($state == 'b' || $state == 'ib')
1231                                 $output .= '</b>';
1232                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1233                                 $output .= '</i>';
1234                         if ($state == 'bi')
1235                                 $output .= '</b>';
1236                         # There might be lonely ''''', so make sure we have a buffer
1237                         if ($state == 'both' && $buffer)
1238                                 $output .= '<b><i>'.$buffer.'</i></b>';
1239                         return $output;
1240                 }
1241         }
1242
1243         /**
1244          * Replace external links
1245          *
1246          * Note: this is all very hackish and the order of execution matters a lot.
1247          * Make sure to run maintenance/parserTests.php if you change this code.
1248          *
1249          * @private
1250          */
1251         function replaceExternalLinks( $text ) {
1252                 global $wgContLang;
1253                 $fname = 'Parser::replaceExternalLinks';
1254                 wfProfileIn( $fname );
1255
1256                 $sk = $this->mOptions->getSkin();
1257
1258                 $bits = preg_split( $this->mExtLinkBracketedRegex, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1259
1260                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1261
1262                 $i = 0;
1263                 while ( $i<count( $bits ) ) {
1264                         $url = $bits[$i++];
1265                         $protocol = $bits[$i++];
1266                         $text = $bits[$i++];
1267                         $trail = $bits[$i++];
1268
1269                         # The characters '<' and '>' (which were escaped by
1270                         # removeHTMLtags()) should not be included in
1271                         # URLs, per RFC 2396.
1272                         $m2 = array();
1273                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1274                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1275                                 $url = substr($url, 0, $m2[0][1]);
1276                         }
1277
1278                         # If the link text is an image URL, replace it with an <img> tag
1279                         # This happened by accident in the original parser, but some people used it extensively
1280                         $img = $this->maybeMakeExternalImage( $text );
1281                         if ( $img !== false ) {
1282                                 $text = $img;
1283                         }
1284
1285                         $dtrail = '';
1286
1287                         # Set linktype for CSS - if URL==text, link is essentially free
1288                         $linktype = ($text == $url) ? 'free' : 'text';
1289
1290                         # No link text, e.g. [http://domain.tld/some.link]
1291                         if ( $text == '' ) {
1292                                 # Autonumber if allowed. See bug #5918
1293                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1294                                         $text = '[' . ++$this->mAutonumber . ']';
1295                                         $linktype = 'autonumber';
1296                                 } else {
1297                                         # Otherwise just use the URL
1298                                         $text = htmlspecialchars( $url );
1299                                         $linktype = 'free';
1300                                 }
1301                         } else {
1302                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1303                                 # Check for trail
1304                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1305                         }
1306
1307                         $text = $wgContLang->markNoConversion($text);
1308
1309                         $url = Sanitizer::cleanUrl( $url );
1310
1311                         # Process the trail (i.e. everything after this link up until start of the next link),
1312                         # replacing any non-bracketed links
1313                         $trail = $this->replaceFreeExternalLinks( $trail );
1314
1315                         # Use the encoded URL
1316                         # This means that users can paste URLs directly into the text
1317                         # Funny characters like &ouml; aren't valid in URLs anyway
1318                         # This was changed in August 2004
1319                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1320
1321                         # Register link in the output object.
1322                         # Replace unnecessary URL escape codes with the referenced character
1323                         # This prevents spammers from hiding links from the filters
1324                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1325                         $this->mOutput->addExternalLink( $pasteurized );
1326                 }
1327
1328                 wfProfileOut( $fname );
1329                 return $s;
1330         }
1331
1332         /**
1333          * Replace anything that looks like a URL with a link
1334          * @private
1335          */
1336         function replaceFreeExternalLinks( $text ) {
1337                 global $wgContLang;
1338                 $fname = 'Parser::replaceFreeExternalLinks';
1339                 wfProfileIn( $fname );
1340
1341                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1342                 $s = array_shift( $bits );
1343                 $i = 0;
1344
1345                 $sk = $this->mOptions->getSkin();
1346
1347                 while ( $i < count( $bits ) ){
1348                         $protocol = $bits[$i++];
1349                         $remainder = $bits[$i++];
1350
1351                         $m = array();
1352                         if ( preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1353                                 # Found some characters after the protocol that look promising
1354                                 $url = $protocol . $m[1];
1355                                 $trail = $m[2];
1356
1357                                 # special case: handle urls as url args:
1358                                 # http://www.example.com/foo?=http://www.example.com/bar
1359                                 if(strlen($trail) == 0 &&
1360                                         isset($bits[$i]) &&
1361                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1362                                         preg_match( '/^('.self::EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1363                                 {
1364                                         # add protocol, arg
1365                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1366                                         $i += 2;
1367                                         $trail = $m[2];
1368                                 }
1369
1370                                 # The characters '<' and '>' (which were escaped by
1371                                 # removeHTMLtags()) should not be included in
1372                                 # URLs, per RFC 2396.
1373                                 $m2 = array();
1374                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1375                                         $trail = substr($url, $m2[0][1]) . $trail;
1376                                         $url = substr($url, 0, $m2[0][1]);
1377                                 }
1378
1379                                 # Move trailing punctuation to $trail
1380                                 $sep = ',;\.:!?';
1381                                 # If there is no left bracket, then consider right brackets fair game too
1382                                 if ( strpos( $url, '(' ) === false ) {
1383                                         $sep .= ')';
1384                                 }
1385
1386                                 $numSepChars = strspn( strrev( $url ), $sep );
1387                                 if ( $numSepChars ) {
1388                                         $trail = substr( $url, -$numSepChars ) . $trail;
1389                                         $url = substr( $url, 0, -$numSepChars );
1390                                 }
1391
1392                                 $url = Sanitizer::cleanUrl( $url );
1393
1394                                 # Is this an external image?
1395                                 $text = $this->maybeMakeExternalImage( $url );
1396                                 if ( $text === false ) {
1397                                         # Not an image, make a link
1398                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1399                                         # Register it in the output object...
1400                                         # Replace unnecessary URL escape codes with their equivalent characters
1401                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1402                                         $this->mOutput->addExternalLink( $pasteurized );
1403                                 }
1404                                 $s .= $text . $trail;
1405                         } else {
1406                                 $s .= $protocol . $remainder;
1407                         }
1408                 }
1409                 wfProfileOut( $fname );
1410                 return $s;
1411         }
1412
1413         /**
1414          * Replace unusual URL escape codes with their equivalent characters
1415          * @param string
1416          * @return string
1417          * @static
1418          * @todo  This can merge genuinely required bits in the path or query string,
1419          *        breaking legit URLs. A proper fix would treat the various parts of
1420          *        the URL differently; as a workaround, just use the output for
1421          *        statistical records, not for actual linking/output.
1422          */
1423         static function replaceUnusualEscapes( $url ) {
1424                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1425                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1426         }
1427
1428         /**
1429          * Callback function used in replaceUnusualEscapes().
1430          * Replaces unusual URL escape codes with their equivalent character
1431          * @static
1432          * @private
1433          */
1434         private static function replaceUnusualEscapesCallback( $matches ) {
1435                 $char = urldecode( $matches[0] );
1436                 $ord = ord( $char );
1437                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1438                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1439                         // No, shouldn't be escaped
1440                         return $char;
1441                 } else {
1442                         // Yes, leave it escaped
1443                         return $matches[0];
1444                 }
1445         }
1446
1447         /**
1448          * make an image if it's allowed, either through the global
1449          * option or through the exception
1450          * @private
1451          */
1452         function maybeMakeExternalImage( $url ) {
1453                 $sk = $this->mOptions->getSkin();
1454                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1455                 $imagesexception = !empty($imagesfrom);
1456                 $text = false;
1457                 if ( $this->mOptions->getAllowExternalImages()
1458                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1459                         if ( preg_match( self::EXT_IMAGE_REGEX, $url ) ) {
1460                                 # Image found
1461                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1462                         }
1463                 }
1464                 return $text;
1465         }
1466
1467         /**
1468          * Process [[ ]] wikilinks
1469          *
1470          * @private
1471          */
1472         function replaceInternalLinks( $s ) {
1473                 global $wgContLang;
1474                 static $fname = 'Parser::replaceInternalLinks' ;
1475
1476                 wfProfileIn( $fname );
1477
1478                 wfProfileIn( $fname.'-setup' );
1479                 static $tc = FALSE;
1480                 # the % is needed to support urlencoded titles as well
1481                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1482
1483                 $sk = $this->mOptions->getSkin();
1484
1485                 #split the entire text string on occurences of [[
1486                 $a = explode( '[[', ' ' . $s );
1487                 #get the first element (all text up to first [[), and remove the space we added
1488                 $s = array_shift( $a );
1489                 $s = substr( $s, 1 );
1490
1491                 # Match a link having the form [[namespace:link|alternate]]trail
1492                 static $e1 = FALSE;
1493                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1494                 # Match cases where there is no "]]", which might still be images
1495                 static $e1_img = FALSE;
1496                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1497
1498                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1499                 $e2 = null;
1500                 if ( $useLinkPrefixExtension ) {
1501                         # Match the end of a line for a word that's not followed by whitespace,
1502                         # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1503                         $e2 = wfMsgForContent( 'linkprefix' );
1504                 }
1505
1506                 if( is_null( $this->mTitle ) ) {
1507                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1508                 }
1509                 $nottalk = !$this->mTitle->isTalkPage();
1510
1511                 if ( $useLinkPrefixExtension ) {
1512                         $m = array();
1513                         if ( preg_match( $e2, $s, $m ) ) {
1514                                 $first_prefix = $m[2];
1515                         } else {
1516                                 $first_prefix = false;
1517                         }
1518                 } else {
1519                         $prefix = '';
1520                 }
1521
1522                 if($wgContLang->hasVariants()) {
1523                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1524                 } else {
1525                         $selflink = array($this->mTitle->getPrefixedText());
1526                 }
1527                 $useSubpages = $this->areSubpagesAllowed();
1528                 wfProfileOut( $fname.'-setup' );
1529
1530                 # Loop for each link
1531                 for ($k = 0; isset( $a[$k] ); $k++) {
1532                         $line = $a[$k];
1533                         if ( $useLinkPrefixExtension ) {
1534                                 wfProfileIn( $fname.'-prefixhandling' );
1535                                 if ( preg_match( $e2, $s, $m ) ) {
1536                                         $prefix = $m[2];
1537                                         $s = $m[1];
1538                                 } else {
1539                                         $prefix='';
1540                                 }
1541                                 # first link
1542                                 if($first_prefix) {
1543                                         $prefix = $first_prefix;
1544                                         $first_prefix = false;
1545                                 }
1546                                 wfProfileOut( $fname.'-prefixhandling' );
1547                         }
1548
1549                         $might_be_img = false;
1550
1551                         wfProfileIn( "$fname-e1" );
1552                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1553                                 $text = $m[2];
1554                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1555                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1556                                 # the real problem is with the $e1 regex
1557                                 # See bug 1300.
1558                                 #
1559                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1560                                 # and no image is in sight. See bug 2095.
1561                                 #
1562                                 if( $text !== '' &&
1563                                         substr( $m[3], 0, 1 ) === ']' &&
1564                                         strpos($text, '[') !== false
1565                                 )
1566                                 {
1567                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1568                                         $m[3] = substr( $m[3], 1 );
1569                                 }
1570                                 # fix up urlencoded title texts
1571                                 if( strpos( $m[1], '%' ) !== false ) {
1572                                         # Should anchors '#' also be rejected?
1573                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1574                                 }
1575                                 $trail = $m[3];
1576                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1577                                 $might_be_img = true;
1578                                 $text = $m[2];
1579                                 if ( strpos( $m[1], '%' ) !== false ) {
1580                                         $m[1] = urldecode($m[1]);
1581                                 }
1582                                 $trail = "";
1583                         } else { # Invalid form; output directly
1584                                 $s .= $prefix . '[[' . $line ;
1585                                 wfProfileOut( "$fname-e1" );
1586                                 continue;
1587                         }
1588                         wfProfileOut( "$fname-e1" );
1589                         wfProfileIn( "$fname-misc" );
1590
1591                         # Don't allow internal links to pages containing
1592                         # PROTO: where PROTO is a valid URL protocol; these
1593                         # should be external links.
1594                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1595                                 $s .= $prefix . '[[' . $line ;
1596                                 continue;
1597                         }
1598
1599                         # Make subpage if necessary
1600                         if( $useSubpages ) {
1601                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1602                         } else {
1603                                 $link = $m[1];
1604                         }
1605
1606                         $noforce = (substr($m[1], 0, 1) != ':');
1607                         if (!$noforce) {
1608                                 # Strip off leading ':'
1609                                 $link = substr($link, 1);
1610                         }
1611
1612                         wfProfileOut( "$fname-misc" );
1613                         wfProfileIn( "$fname-title" );
1614                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1615                         if( !$nt ) {
1616                                 $s .= $prefix . '[[' . $line;
1617                                 wfProfileOut( "$fname-title" );
1618                                 continue;
1619                         }
1620
1621                         $ns = $nt->getNamespace();
1622                         $iw = $nt->getInterWiki();
1623                         wfProfileOut( "$fname-title" );
1624
1625                         if ($might_be_img) { # if this is actually an invalid link
1626                                 wfProfileIn( "$fname-might_be_img" );
1627                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1628                                         $found = false;
1629                                         while (isset ($a[$k+1]) ) {
1630                                                 #look at the next 'line' to see if we can close it there
1631                                                 $spliced = array_splice( $a, $k + 1, 1 );
1632                                                 $next_line = array_shift( $spliced );
1633                                                 $m = explode( ']]', $next_line, 3 );
1634                                                 if ( count( $m ) == 3 ) {
1635                                                         # the first ]] closes the inner link, the second the image
1636                                                         $found = true;
1637                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1638                                                         $trail = $m[2];
1639                                                         break;
1640                                                 } elseif ( count( $m ) == 2 ) {
1641                                                         #if there's exactly one ]] that's fine, we'll keep looking
1642                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1643                                                 } else {
1644                                                         #if $next_line is invalid too, we need look no further
1645                                                         $text .= '[[' . $next_line;
1646                                                         break;
1647                                                 }
1648                                         }
1649                                         if ( !$found ) {
1650                                                 # we couldn't find the end of this imageLink, so output it raw
1651                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1652                                                 $text = $this->replaceInternalLinks($text);
1653                                                 $s .= "{$prefix}[[$link|$text";
1654                                                 # note: no $trail, because without an end, there *is* no trail
1655                                                 wfProfileOut( "$fname-might_be_img" );
1656                                                 continue;
1657                                         }
1658                                 } else { #it's not an image, so output it raw
1659                                         $s .= "{$prefix}[[$link|$text";
1660                                         # note: no $trail, because without an end, there *is* no trail
1661                                         wfProfileOut( "$fname-might_be_img" );
1662                                         continue;
1663                                 }
1664                                 wfProfileOut( "$fname-might_be_img" );
1665                         }
1666
1667                         $wasblank = ( '' == $text );
1668                         if( $wasblank ) $text = $link;
1669
1670                         # Link not escaped by : , create the various objects
1671                         if( $noforce ) {
1672
1673                                 # Interwikis
1674                                 wfProfileIn( "$fname-interwiki" );
1675                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1676                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1677                                         $s = rtrim($s . $prefix);
1678                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1679                                         wfProfileOut( "$fname-interwiki" );
1680                                         continue;
1681                                 }
1682                                 wfProfileOut( "$fname-interwiki" );
1683
1684                                 if ( $ns == NS_IMAGE ) {
1685                                         wfProfileIn( "$fname-image" );
1686                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1687                                                 # recursively parse links inside the image caption
1688                                                 # actually, this will parse them in any other parameters, too,
1689                                                 # but it might be hard to fix that, and it doesn't matter ATM
1690                                                 $text = $this->replaceExternalLinks($text);
1691                                                 $text = $this->replaceInternalLinks($text);
1692
1693                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1694                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1695                                                 $this->mOutput->addImage( $nt->getDBkey() );
1696
1697                                                 wfProfileOut( "$fname-image" );
1698                                                 continue;
1699                                         } else {
1700                                                 # We still need to record the image's presence on the page
1701                                                 $this->mOutput->addImage( $nt->getDBkey() );
1702                                         }
1703                                         wfProfileOut( "$fname-image" );
1704
1705                                 }
1706
1707                                 if ( $ns == NS_CATEGORY ) {
1708                                         wfProfileIn( "$fname-category" );
1709                                         $s = rtrim($s . "\n"); # bug 87
1710
1711                                         if ( $wasblank ) {
1712                                                 $sortkey = $this->getDefaultSort();
1713                                         } else {
1714                                                 $sortkey = $text;
1715                                         }
1716                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1717                                         $sortkey = str_replace( "\n", '', $sortkey );
1718                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1719                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1720
1721                                         /**
1722                                          * Strip the whitespace Category links produce, see bug 87
1723                                          * @todo We might want to use trim($tmp, "\n") here.
1724                                          */
1725                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1726
1727                                         wfProfileOut( "$fname-category" );
1728                                         continue;
1729                                 }
1730                         }
1731
1732                         # Self-link checking
1733                         if( $nt->getFragment() === '' ) {
1734                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1735                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1736                                         continue;
1737                                 }
1738                         }
1739
1740                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1741                         if( $ns == NS_MEDIA ) {
1742                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1743                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1744                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1745                                 $this->mOutput->addImage( $nt->getDBkey() );
1746                                 continue;
1747                         } elseif( $ns == NS_SPECIAL ) {
1748                                 if( SpecialPage::exists( $nt->getDBkey() ) ) {
1749                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1750                                 } else {
1751                                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1752                                 }
1753                                 continue;
1754                         } elseif( $ns == NS_IMAGE ) {
1755                                 $img = wfFindFile( $nt );
1756                                 if( $img ) {
1757                                         // Force a blue link if the file exists; may be a remote
1758                                         // upload on the shared repository, and we want to see its
1759                                         // auto-generated page.
1760                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1761                                         $this->mOutput->addLink( $nt );
1762                                         continue;
1763                                 }
1764                         }
1765                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1766                 }
1767                 wfProfileOut( $fname );
1768                 return $s;
1769         }
1770
1771         /**
1772          * Make a link placeholder. The text returned can be later resolved to a real link with
1773          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1774          * parsing of interwiki links, and secondly to allow all existence checks and
1775          * article length checks (for stub links) to be bundled into a single query.
1776          *
1777          */
1778         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1779                 wfProfileIn( __METHOD__ );
1780                 if ( ! is_object($nt) ) {
1781                         # Fail gracefully
1782                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1783                 } else {
1784                         # Separate the link trail from the rest of the link
1785                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1786
1787                         if ( $nt->isExternal() ) {
1788                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1789                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1790                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1791                         } else {
1792                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1793                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1794                                 $this->mLinkHolders['queries'][] = $query;
1795                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1796                                 $this->mLinkHolders['titles'][] = $nt;
1797
1798                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1799                         }
1800                 }
1801                 wfProfileOut( __METHOD__ );
1802                 return $retVal;
1803         }
1804
1805         /**
1806          * Render a forced-blue link inline; protect against double expansion of
1807          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1808          * Since this little disaster has to split off the trail text to avoid
1809          * breaking URLs in the following text without breaking trails on the
1810          * wiki links, it's been made into a horrible function.
1811          *
1812          * @param Title $nt
1813          * @param string $text
1814          * @param string $query
1815          * @param string $trail
1816          * @param string $prefix
1817          * @return string HTML-wikitext mix oh yuck
1818          */
1819         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1820                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1821                 $sk = $this->mOptions->getSkin();
1822                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1823                 return $this->armorLinks( $link ) . $trail;
1824         }
1825
1826         /**
1827          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1828          * going to go through further parsing steps before inline URL expansion.
1829          *
1830          * In particular this is important when using action=render, which causes
1831          * full URLs to be included.
1832          *
1833          * Oh man I hate our multi-layer parser!
1834          *
1835          * @param string more-or-less HTML
1836          * @return string less-or-more HTML with NOPARSE bits
1837          */
1838         function armorLinks( $text ) {
1839                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1840                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1841         }
1842
1843         /**
1844          * Return true if subpage links should be expanded on this page.
1845          * @return bool
1846          */
1847         function areSubpagesAllowed() {
1848                 # Some namespaces don't allow subpages
1849                 global $wgNamespacesWithSubpages;
1850                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1851         }
1852
1853         /**
1854          * Handle link to subpage if necessary
1855          * @param string $target the source of the link
1856          * @param string &$text the link text, modified as necessary
1857          * @return string the full name of the link
1858          * @private
1859          */
1860         function maybeDoSubpageLink($target, &$text) {
1861                 # Valid link forms:
1862                 # Foobar -- normal
1863                 # :Foobar -- override special treatment of prefix (images, language links)
1864                 # /Foobar -- convert to CurrentPage/Foobar
1865                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1866                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1867                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1868
1869                 $fname = 'Parser::maybeDoSubpageLink';
1870                 wfProfileIn( $fname );
1871                 $ret = $target; # default return value is no change
1872
1873                 # Some namespaces don't allow subpages,
1874                 # so only perform processing if subpages are allowed
1875                 if( $this->areSubpagesAllowed() ) {
1876                         $hash = strpos( $target, '#' );
1877                         if( $hash !== false ) {
1878                                 $suffix = substr( $target, $hash );
1879                                 $target = substr( $target, 0, $hash );
1880                         } else {
1881                                 $suffix = '';
1882                         }
1883                         # bug 7425
1884                         $target = trim( $target );
1885                         # Look at the first character
1886                         if( $target != '' && $target{0} == '/' ) {
1887                                 # / at end means we don't want the slash to be shown
1888                                 $m = array();
1889                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1890                                 if( $trailingSlashes ) {
1891                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1892                                 } else {
1893                                         $noslash = substr( $target, 1 );
1894                                 }
1895
1896                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash) . $suffix;
1897                                 if( '' === $text ) {
1898                                         $text = $target . $suffix;
1899                                 } # this might be changed for ugliness reasons
1900                         } else {
1901                                 # check for .. subpage backlinks
1902                                 $dotdotcount = 0;
1903                                 $nodotdot = $target;
1904                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1905                                         ++$dotdotcount;
1906                                         $nodotdot = substr( $nodotdot, 3 );
1907                                 }
1908                                 if($dotdotcount > 0) {
1909                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1910                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1911                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1912                                                 # / at the end means don't show full path
1913                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1914                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1915                                                         if( '' === $text ) {
1916                                                                 $text = $nodotdot . $suffix;
1917                                                         }
1918                                                 }
1919                                                 $nodotdot = trim( $nodotdot );
1920                                                 if( $nodotdot != '' ) {
1921                                                         $ret .= '/' . $nodotdot;
1922                                                 }
1923                                                 $ret .= $suffix;
1924                                         }
1925                                 }
1926                         }
1927                 }
1928
1929                 wfProfileOut( $fname );
1930                 return $ret;
1931         }
1932
1933         /**#@+
1934          * Used by doBlockLevels()
1935          * @private
1936          */
1937         /* private */ function closeParagraph() {
1938                 $result = '';
1939                 if ( '' != $this->mLastSection ) {
1940                         $result = '</' . $this->mLastSection  . ">\n";
1941                 }
1942                 $this->mInPre = false;
1943                 $this->mLastSection = '';
1944                 return $result;
1945         }
1946         # getCommon() returns the length of the longest common substring
1947         # of both arguments, starting at the beginning of both.
1948         #
1949         /* private */ function getCommon( $st1, $st2 ) {
1950                 $fl = strlen( $st1 );
1951                 $shorter = strlen( $st2 );
1952                 if ( $fl < $shorter ) { $shorter = $fl; }
1953
1954                 for ( $i = 0; $i < $shorter; ++$i ) {
1955                         if ( $st1{$i} != $st2{$i} ) { break; }
1956                 }
1957                 return $i;
1958         }
1959         # These next three functions open, continue, and close the list
1960         # element appropriate to the prefix character passed into them.
1961         #
1962         /* private */ function openList( $char ) {
1963                 $result = $this->closeParagraph();
1964
1965                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1966                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1967                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1968                 else if ( ';' == $char ) {
1969                         $result .= '<dl><dt>';
1970                         $this->mDTopen = true;
1971                 }
1972                 else { $result = '<!-- ERR 1 -->'; }
1973
1974                 return $result;
1975         }
1976
1977         /* private */ function nextItem( $char ) {
1978                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
1979                 else if ( ':' == $char || ';' == $char ) {
1980                         $close = '</dd>';
1981                         if ( $this->mDTopen ) { $close = '</dt>'; }
1982                         if ( ';' == $char ) {
1983                                 $this->mDTopen = true;
1984                                 return $close . '<dt>';
1985                         } else {
1986                                 $this->mDTopen = false;
1987                                 return $close . '<dd>';
1988                         }
1989                 }
1990                 return '<!-- ERR 2 -->';
1991         }
1992
1993         /* private */ function closeList( $char ) {
1994                 if ( '*' == $char ) { $text = '</li></ul>'; }
1995                 else if ( '#' == $char ) { $text = '</li></ol>'; }
1996                 else if ( ':' == $char ) {
1997                         if ( $this->mDTopen ) {
1998                                 $this->mDTopen = false;
1999                                 $text = '</dt></dl>';
2000                         } else {
2001                                 $text = '</dd></dl>';
2002                         }
2003                 }
2004                 else {  return '<!-- ERR 3 -->'; }
2005                 return $text."\n";
2006         }
2007         /**#@-*/
2008
2009         /**
2010          * Make lists from lines starting with ':', '*', '#', etc.
2011          *
2012          * @private
2013          * @return string the lists rendered as HTML
2014          */
2015         function doBlockLevels( $text, $linestart ) {
2016                 $fname = 'Parser::doBlockLevels';
2017                 wfProfileIn( $fname );
2018
2019                 # Parsing through the text line by line.  The main thing
2020                 # happening here is handling of block-level elements p, pre,
2021                 # and making lists from lines starting with * # : etc.
2022                 #
2023                 $textLines = explode( "\n", $text );
2024
2025                 $lastPrefix = $output = '';
2026                 $this->mDTopen = $inBlockElem = false;
2027                 $prefixLength = 0;
2028                 $paragraphStack = false;
2029
2030                 if ( !$linestart ) {
2031                         $output .= array_shift( $textLines );
2032                 }
2033                 foreach ( $textLines as $oLine ) {
2034                         $lastPrefixLength = strlen( $lastPrefix );
2035                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2036                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2037                         if ( !$this->mInPre ) {
2038                                 # Multiple prefixes may abut each other for nested lists.
2039                                 $prefixLength = strspn( $oLine, '*#:;' );
2040                                 $pref = substr( $oLine, 0, $prefixLength );
2041
2042                                 # eh?
2043                                 $pref2 = str_replace( ';', ':', $pref );
2044                                 $t = substr( $oLine, $prefixLength );
2045                                 $this->mInPre = !empty($preOpenMatch);
2046                         } else {
2047                                 # Don't interpret any other prefixes in preformatted text
2048                                 $prefixLength = 0;
2049                                 $pref = $pref2 = '';
2050                                 $t = $oLine;
2051                         }
2052
2053                         # List generation
2054                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2055                                 # Same as the last item, so no need to deal with nesting or opening stuff
2056                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2057                                 $paragraphStack = false;
2058
2059                                 if ( substr( $pref, -1 ) == ';') {
2060                                         # The one nasty exception: definition lists work like this:
2061                                         # ; title : definition text
2062                                         # So we check for : in the remainder text to split up the
2063                                         # title and definition, without b0rking links.
2064                                         $term = $t2 = '';
2065                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2066                                                 $t = $t2;
2067                                                 $output .= $term . $this->nextItem( ':' );
2068                                         }
2069                                 }
2070                         } elseif( $prefixLength || $lastPrefixLength ) {
2071                                 # Either open or close a level...
2072                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2073                                 $paragraphStack = false;
2074
2075                                 while( $commonPrefixLength < $lastPrefixLength ) {
2076                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2077                                         --$lastPrefixLength;
2078                                 }
2079                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2080                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2081                                 }
2082                                 while ( $prefixLength > $commonPrefixLength ) {
2083                                         $char = substr( $pref, $commonPrefixLength, 1 );
2084                                         $output .= $this->openList( $char );
2085
2086                                         if ( ';' == $char ) {
2087                                                 # FIXME: This is dupe of code above
2088                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2089                                                         $t = $t2;
2090                                                         $output .= $term . $this->nextItem( ':' );
2091                                                 }
2092                                         }
2093                                         ++$commonPrefixLength;
2094                                 }
2095                                 $lastPrefix = $pref2;
2096                         }
2097                         if( 0 == $prefixLength ) {
2098                                 wfProfileIn( "$fname-paragraph" );
2099                                 # No prefix (not in list)--go to paragraph mode
2100                                 // XXX: use a stack for nestable elements like span, table and div
2101                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2102                                 $closematch = preg_match(
2103                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2104                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2105                                 if ( $openmatch or $closematch ) {
2106                                         $paragraphStack = false;
2107                                         # TODO bug 5718: paragraph closed
2108                                         $output .= $this->closeParagraph();
2109                                         if ( $preOpenMatch and !$preCloseMatch ) {
2110                                                 $this->mInPre = true;
2111                                         }
2112                                         if ( $closematch ) {
2113                                                 $inBlockElem = false;
2114                                         } else {
2115                                                 $inBlockElem = true;
2116                                         }
2117                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2118                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2119                                                 // pre
2120                                                 if ($this->mLastSection != 'pre') {
2121                                                         $paragraphStack = false;
2122                                                         $output .= $this->closeParagraph().'<pre>';
2123                                                         $this->mLastSection = 'pre';
2124                                                 }
2125                                                 $t = substr( $t, 1 );
2126                                         } else {
2127                                                 // paragraph
2128                                                 if ( '' == trim($t) ) {
2129                                                         if ( $paragraphStack ) {
2130                                                                 $output .= $paragraphStack.'<br />';
2131                                                                 $paragraphStack = false;
2132                                                                 $this->mLastSection = 'p';
2133                                                         } else {
2134                                                                 if ($this->mLastSection != 'p' ) {
2135                                                                         $output .= $this->closeParagraph();
2136                                                                         $this->mLastSection = '';
2137                                                                         $paragraphStack = '<p>';
2138                                                                 } else {
2139                                                                         $paragraphStack = '</p><p>';
2140                                                                 }
2141                                                         }
2142                                                 } else {
2143                                                         if ( $paragraphStack ) {
2144                                                                 $output .= $paragraphStack;
2145                                                                 $paragraphStack = false;
2146                                                                 $this->mLastSection = 'p';
2147                                                         } else if ($this->mLastSection != 'p') {
2148                                                                 $output .= $this->closeParagraph().'<p>';
2149                                                                 $this->mLastSection = 'p';
2150                                                         }
2151                                                 }
2152                                         }
2153                                 }
2154                                 wfProfileOut( "$fname-paragraph" );
2155                         }
2156                         // somewhere above we forget to get out of pre block (bug 785)
2157                         if($preCloseMatch && $this->mInPre) {
2158                                 $this->mInPre = false;
2159                         }
2160                         if ($paragraphStack === false) {
2161                                 $output .= $t."\n";
2162                         }
2163                 }
2164                 while ( $prefixLength ) {
2165                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2166                         --$prefixLength;
2167                 }
2168                 if ( '' != $this->mLastSection ) {
2169                         $output .= '</' . $this->mLastSection . '>';
2170                         $this->mLastSection = '';
2171                 }
2172
2173                 wfProfileOut( $fname );
2174                 return $output;
2175         }
2176
2177         /**
2178          * Split up a string on ':', ignoring any occurences inside tags
2179          * to prevent illegal overlapping.
2180          * @param string $str the string to split
2181          * @param string &$before set to everything before the ':'
2182          * @param string &$after set to everything after the ':'
2183          * return string the position of the ':', or false if none found
2184          */
2185         function findColonNoLinks($str, &$before, &$after) {
2186                 $fname = 'Parser::findColonNoLinks';
2187                 wfProfileIn( $fname );
2188
2189                 $pos = strpos( $str, ':' );
2190                 if( $pos === false ) {
2191                         // Nothing to find!
2192                         wfProfileOut( $fname );
2193                         return false;
2194                 }
2195
2196                 $lt = strpos( $str, '<' );
2197                 if( $lt === false || $lt > $pos ) {
2198                         // Easy; no tag nesting to worry about
2199                         $before = substr( $str, 0, $pos );
2200                         $after = substr( $str, $pos+1 );
2201                         wfProfileOut( $fname );
2202                         return $pos;
2203                 }
2204
2205                 // Ugly state machine to walk through avoiding tags.
2206                 $state = self::COLON_STATE_TEXT;
2207                 $stack = 0;
2208                 $len = strlen( $str );
2209                 for( $i = 0; $i < $len; $i++ ) {
2210                         $c = $str{$i};
2211
2212                         switch( $state ) {
2213                         // (Using the number is a performance hack for common cases)
2214                         case 0: // self::COLON_STATE_TEXT:
2215                                 switch( $c ) {
2216                                 case "<":
2217                                         // Could be either a <start> tag or an </end> tag
2218                                         $state = self::COLON_STATE_TAGSTART;
2219                                         break;
2220                                 case ":":
2221                                         if( $stack == 0 ) {
2222                                                 // We found it!
2223                                                 $before = substr( $str, 0, $i );
2224                                                 $after = substr( $str, $i + 1 );
2225                                                 wfProfileOut( $fname );
2226                                                 return $i;
2227                                         }
2228                                         // Embedded in a tag; don't break it.
2229                                         break;
2230                                 default:
2231                                         // Skip ahead looking for something interesting
2232                                         $colon = strpos( $str, ':', $i );
2233                                         if( $colon === false ) {
2234                                                 // Nothing else interesting
2235                                                 wfProfileOut( $fname );
2236                                                 return false;
2237                                         }
2238                                         $lt = strpos( $str, '<', $i );
2239                                         if( $stack === 0 ) {
2240                                                 if( $lt === false || $colon < $lt ) {
2241                                                         // We found it!
2242                                                         $before = substr( $str, 0, $colon );
2243                                                         $after = substr( $str, $colon + 1 );
2244                                                         wfProfileOut( $fname );
2245                                                         return $i;
2246                                                 }
2247                                         }
2248                                         if( $lt === false ) {
2249                                                 // Nothing else interesting to find; abort!
2250                                                 // We're nested, but there's no close tags left. Abort!
2251                                                 break 2;
2252                                         }
2253                                         // Skip ahead to next tag start
2254                                         $i = $lt;
2255                                         $state = self::COLON_STATE_TAGSTART;
2256                                 }
2257                                 break;
2258                         case 1: // self::COLON_STATE_TAG:
2259                                 // In a <tag>
2260                                 switch( $c ) {
2261                                 case ">":
2262                                         $stack++;
2263                                         $state = self::COLON_STATE_TEXT;
2264                                         break;
2265                                 case "/":
2266                                         // Slash may be followed by >?
2267                                         $state = self::COLON_STATE_TAGSLASH;
2268                                         break;
2269                                 default:
2270                                         // ignore
2271                                 }
2272                                 break;
2273                         case 2: // self::COLON_STATE_TAGSTART:
2274                                 switch( $c ) {
2275                                 case "/":
2276                                         $state = self::COLON_STATE_CLOSETAG;
2277                                         break;
2278                                 case "!":
2279                                         $state = self::COLON_STATE_COMMENT;
2280                                         break;
2281                                 case ">":
2282                                         // Illegal early close? This shouldn't happen D:
2283                                         $state = self::COLON_STATE_TEXT;
2284                                         break;
2285                                 default:
2286                                         $state = self::COLON_STATE_TAG;
2287                                 }
2288                                 break;
2289                         case 3: // self::COLON_STATE_CLOSETAG:
2290                                 // In a </tag>
2291                                 if( $c == ">" ) {
2292                                         $stack--;
2293                                         if( $stack < 0 ) {
2294                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2295                                                 wfProfileOut( $fname );
2296                                                 return false;
2297                                         }
2298                                         $state = self::COLON_STATE_TEXT;
2299                                 }
2300                                 break;
2301                         case self::COLON_STATE_TAGSLASH:
2302                                 if( $c == ">" ) {
2303                                         // Yes, a self-closed tag <blah/>
2304                                         $state = self::COLON_STATE_TEXT;
2305                                 } else {
2306                                         // Probably we're jumping the gun, and this is an attribute
2307                                         $state = self::COLON_STATE_TAG;
2308                                 }
2309                                 break;
2310                         case 5: // self::COLON_STATE_COMMENT:
2311                                 if( $c == "-" ) {
2312                                         $state = self::COLON_STATE_COMMENTDASH;
2313                                 }
2314                                 break;
2315                         case self::COLON_STATE_COMMENTDASH:
2316                                 if( $c == "-" ) {
2317                                         $state = self::COLON_STATE_COMMENTDASHDASH;
2318                                 } else {
2319                                         $state = self::COLON_STATE_COMMENT;
2320                                 }
2321                                 break;
2322                         case self::COLON_STATE_COMMENTDASHDASH:
2323                                 if( $c == ">" ) {
2324                                         $state = self::COLON_STATE_TEXT;
2325                                 } else {
2326                                         $state = self::COLON_STATE_COMMENT;
2327                                 }
2328                                 break;
2329                         default:
2330                                 throw new MWException( "State machine error in $fname" );
2331                         }
2332                 }
2333                 if( $stack > 0 ) {
2334                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2335                         return false;
2336                 }
2337                 wfProfileOut( $fname );
2338                 return false;
2339         }
2340
2341         /**
2342          * Return value of a magic variable (like PAGENAME)
2343          *
2344          * @private
2345          */
2346         function getVariableValue( $index ) {
2347                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2348
2349                 /**
2350                  * Some of these require message or data lookups and can be
2351                  * expensive to check many times.
2352                  */
2353                 static $varCache = array();
2354                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2355                         if ( isset( $varCache[$index] ) ) {
2356                                 return $varCache[$index];
2357                         }
2358                 }
2359
2360                 $ts = time();
2361                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2362
2363                 # Use the time zone
2364                 global $wgLocaltimezone;
2365                 if ( isset( $wgLocaltimezone ) ) {
2366                         $oldtz = getenv( 'TZ' );
2367                         putenv( 'TZ='.$wgLocaltimezone );
2368                 }
2369
2370                 wfSuppressWarnings(); // E_STRICT system time bitching
2371                 $localTimestamp = date( 'YmdHis', $ts );
2372                 $localMonth = date( 'm', $ts );
2373                 $localMonthName = date( 'n', $ts );
2374                 $localDay = date( 'j', $ts );
2375                 $localDay2 = date( 'd', $ts );
2376                 $localDayOfWeek = date( 'w', $ts );
2377                 $localWeek = date( 'W', $ts );
2378                 $localYear = date( 'Y', $ts );
2379                 $localHour = date( 'H', $ts );
2380                 if ( isset( $wgLocaltimezone ) ) {
2381                         putenv( 'TZ='.$oldtz );
2382                 }
2383                 wfRestoreWarnings();
2384
2385                 switch ( $index ) {
2386                         case 'currentmonth':
2387                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'm', $ts ) );
2388                         case 'currentmonthname':
2389                                 return $varCache[$index] = $wgContLang->getMonthName( gmdate( 'n', $ts ) );
2390                         case 'currentmonthnamegen':
2391                                 return $varCache[$index] = $wgContLang->getMonthNameGen( gmdate( 'n', $ts ) );
2392                         case 'currentmonthabbrev':
2393                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( gmdate( 'n', $ts ) );
2394                         case 'currentday':
2395                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'j', $ts ) );
2396                         case 'currentday2':
2397                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'd', $ts ) );
2398                         case 'localmonth':
2399                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2400                         case 'localmonthname':
2401                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2402                         case 'localmonthnamegen':
2403                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2404                         case 'localmonthabbrev':
2405                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2406                         case 'localday':
2407                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2408                         case 'localday2':
2409                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2410                         case 'pagename':
2411                                 return wfEscapeWikiText( $this->mTitle->getText() );
2412                         case 'pagenamee':
2413                                 return $this->mTitle->getPartialURL();
2414                         case 'fullpagename':
2415                                 return wfEscapeWikiText( $this->mTitle->getPrefixedText() );
2416                         case 'fullpagenamee':
2417                                 return $this->mTitle->getPrefixedURL();
2418                         case 'subpagename':
2419                                 return wfEscapeWikiText( $this->mTitle->getSubpageText() );
2420                         case 'subpagenamee':
2421                                 return $this->mTitle->getSubpageUrlForm();
2422                         case 'basepagename':
2423                                 return wfEscapeWikiText( $this->mTitle->getBaseText() );
2424                         case 'basepagenamee':
2425                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2426                         case 'talkpagename':
2427                                 if( $this->mTitle->canTalk() ) {
2428                                         $talkPage = $this->mTitle->getTalkPage();
2429                                         return wfEscapeWikiText( $talkPage->getPrefixedText() );
2430                                 } else {
2431                                         return '';
2432                                 }
2433                         case 'talkpagenamee':
2434                                 if( $this->mTitle->canTalk() ) {
2435                                         $talkPage = $this->mTitle->getTalkPage();
2436                                         return $talkPage->getPrefixedUrl();
2437                                 } else {
2438                                         return '';
2439                                 }
2440                         case 'subjectpagename':
2441                                 $subjPage = $this->mTitle->getSubjectPage();
2442                                 return wfEscapeWikiText( $subjPage->getPrefixedText() );
2443                         case 'subjectpagenamee':
2444                                 $subjPage = $this->mTitle->getSubjectPage();
2445                                 return $subjPage->getPrefixedUrl();
2446                         case 'revisionid':
2447                                 // Let the edit saving system know we should parse the page
2448                                 // *after* a revision ID has been assigned.
2449                                 $this->mOutput->setFlag( 'vary-revision' );
2450                                 wfDebug( __METHOD__ . ": {{REVISIONID}} used, setting vary-revision...\n" );
2451                                 return $this->mRevisionId;
2452                         case 'revisionday':
2453                                 // Let the edit saving system know we should parse the page
2454                                 // *after* a revision ID has been assigned. This is for null edits.
2455                                 $this->mOutput->setFlag( 'vary-revision' );
2456                                 wfDebug( __METHOD__ . ": {{REVISIONDAY}} used, setting vary-revision...\n" );
2457                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2458                         case 'revisionday2':
2459                                 // Let the edit saving system know we should parse the page
2460                                 // *after* a revision ID has been assigned. This is for null edits.
2461                                 $this->mOutput->setFlag( 'vary-revision' );
2462                                 wfDebug( __METHOD__ . ": {{REVISIONDAY2}} used, setting vary-revision...\n" );
2463                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2464                         case 'revisionmonth':
2465                                 // Let the edit saving system know we should parse the page
2466                                 // *after* a revision ID has been assigned. This is for null edits.
2467                                 $this->mOutput->setFlag( 'vary-revision' );
2468                                 wfDebug( __METHOD__ . ": {{REVISIONMONTH}} used, setting vary-revision...\n" );
2469                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2470                         case 'revisionyear':
2471                                 // Let the edit saving system know we should parse the page
2472                                 // *after* a revision ID has been assigned. This is for null edits.
2473                                 $this->mOutput->setFlag( 'vary-revision' );
2474                                 wfDebug( __METHOD__ . ": {{REVISIONYEAR}} used, setting vary-revision...\n" );
2475                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2476                         case 'revisiontimestamp':
2477                                 // Let the edit saving system know we should parse the page
2478                                 // *after* a revision ID has been assigned. This is for null edits.
2479                                 $this->mOutput->setFlag( 'vary-revision' );
2480                                 wfDebug( __METHOD__ . ": {{REVISIONTIMESTAMP}} used, setting vary-revision...\n" );
2481                                 return $this->getRevisionTimestamp();
2482                         case 'namespace':
2483                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2484                         case 'namespacee':
2485                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2486                         case 'talkspace':
2487                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2488                         case 'talkspacee':
2489                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2490                         case 'subjectspace':
2491                                 return $this->mTitle->getSubjectNsText();
2492                         case 'subjectspacee':
2493                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2494                         case 'currentdayname':
2495                                 return $varCache[$index] = $wgContLang->getWeekdayName( gmdate( 'w', $ts ) + 1 );
2496                         case 'currentyear':
2497                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'Y', $ts ), true );
2498                         case 'currenttime':
2499                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2500                         case 'currenthour':
2501                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'H', $ts ), true );
2502                         case 'currentweek':
2503                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2504                                 // int to remove the padding
2505                                 return $varCache[$index] = $wgContLang->formatNum( (int)gmdate( 'W', $ts ) );
2506                         case 'currentdow':
2507                                 return $varCache[$index] = $wgContLang->formatNum( gmdate( 'w', $ts ) );
2508                         case 'localdayname':
2509                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2510                         case 'localyear':
2511                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2512                         case 'localtime':
2513                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2514                         case 'localhour':
2515                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2516                         case 'localweek':
2517                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2518                                 // int to remove the padding
2519                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2520                         case 'localdow':
2521                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2522                         case 'numberofarticles':
2523                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2524                         case 'numberoffiles':
2525                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2526                         case 'numberofusers':
2527                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2528                         case 'numberofpages':
2529                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2530                         case 'numberofadmins':
2531                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::admins() );
2532                         case 'numberofedits':
2533                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::edits() );
2534                         case 'currenttimestamp':
2535                                 return $varCache[$index] = wfTimestampNow();
2536                         case 'localtimestamp':
2537                                 return $varCache[$index] = $localTimestamp;
2538                         case 'currentversion':
2539                                 return $varCache[$index] = SpecialVersion::getVersion();
2540                         case 'sitename':
2541                                 return $wgSitename;
2542                         case 'server':
2543                                 return $wgServer;
2544                         case 'servername':
2545                                 return $wgServerName;
2546                         case 'scriptpath':
2547                                 return $wgScriptPath;
2548                         case 'directionmark':
2549                                 return $wgContLang->getDirMark();
2550                         case 'contentlanguage':
2551                                 global $wgContLanguageCode;
2552                                 return $wgContLanguageCode;
2553                         default:
2554                                 $ret = null;
2555                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2556                                         return $ret;
2557                                 else
2558                                         return null;
2559                 }
2560         }
2561
2562         /**
2563          * initialise the magic variables (like CURRENTMONTHNAME)
2564          *
2565          * @private
2566          */
2567         function initialiseVariables() {
2568                 $fname = 'Parser::initialiseVariables';
2569                 wfProfileIn( $fname );
2570                 $variableIDs = MagicWord::getVariableIDs();
2571
2572                 $this->mVariables = new MagicWordArray( $variableIDs );
2573                 wfProfileOut( $fname );
2574         }
2575
2576         /**
2577          * Preprocess some wikitext and return the document tree.
2578          * This is the ghost of replace_variables().
2579          *
2580          * @param string $text The text to parse
2581          * @param integer flags Bitwise combination of:
2582          *          self::PTD_FOR_INCLUSION    Handle <noinclude>/<includeonly> as if the text is being
2583          *                                     included. Default is to assume a direct page view.
2584          *
2585          * The generated DOM tree must depend only on the input text and the flags.
2586          * The DOM tree must be the same in OT_HTML and OT_WIKI mode, to avoid a regression of bug 4899.
2587          *
2588          * Any flag added to the $flags parameter here, or any other parameter liable to cause a
2589          * change in the DOM tree for a given text, must be passed through the section identifier
2590          * in the section edit link and thus back to extractSections().
2591          *
2592          * The output of this function is currently only cached in process memory, but a persistent
2593          * cache may be implemented at a later date which takes further advantage of these strict
2594          * dependency requirements.
2595          *
2596          * @private
2597          */
2598         function preprocessToDom ( $text, $flags = 0 ) {
2599                 wfProfileIn( __METHOD__ );
2600                 wfProfileIn( __METHOD__.'-makexml' );
2601
2602                 $rules = array(
2603                         '{' => array(
2604                                 'end' => '}',
2605                                 'names' => array(
2606                                         2 => 'template',
2607                                         3 => 'tplarg',
2608                                 ),
2609                                 'min' => 2,
2610                                 'max' => 3,
2611                         ),
2612                         '[' => array(
2613                                 'end' => ']',
2614                                 'names' => array( 2 => null ),
2615                                 'min' => 2,
2616                                 'max' => 2,
2617                         )
2618                 );
2619
2620                 $forInclusion = $flags & self::PTD_FOR_INCLUSION;
2621
2622                 $xmlishElements = $this->getStripList();
2623                 $enableOnlyinclude = false;
2624                 if ( $forInclusion ) {
2625                         $ignoredTags = array( 'includeonly', '/includeonly' );
2626                         $ignoredElements = array( 'noinclude' );
2627                         $xmlishElements[] = 'noinclude';
2628                         if ( strpos( $text, '<onlyinclude>' ) !== false && strpos( $text, '</onlyinclude>' ) !== false ) {
2629                                 $enableOnlyinclude = true;
2630                         }
2631                 } else {
2632                         $ignoredTags = array( 'noinclude', '/noinclude', 'onlyinclude', '/onlyinclude' );
2633                         $ignoredElements = array( 'includeonly' );
2634                         $xmlishElements[] = 'includeonly';
2635                 }
2636                 $xmlishRegex = implode( '|', array_merge( $xmlishElements, $ignoredTags ) );
2637
2638                 // Use "A" modifier (anchored) instead of "^", because ^ doesn't work with an offset
2639                 $elementsRegex = "~($xmlishRegex)(?:\s|\/>|>)|(!--)~iA";
2640
2641                 $stack = new PPDStack;
2642
2643                 $searchBase = '[{<';
2644                 $revText = strrev( $text ); // For fast reverse searches
2645
2646                 $i = 0;                     # Input pointer, starts out pointing to a pseudo-newline before the start
2647                 $accum =& $stack->getAccum();   # Current text accumulator
2648                 $accum = '<root>';
2649                 $findEquals = false;            # True to find equals signs in arguments
2650                 $findPipe = false;              # True to take notice of pipe characters
2651                 $headingIndex = 1;
2652                 $inHeading = false;        # True if $i is inside a possible heading
2653                 $noMoreGT = false;         # True if there are no more greater-than (>) signs right of $i
2654                 $findOnlyinclude = $enableOnlyinclude; # True to ignore all input up to the next <onlyinclude>
2655                 $fakeLineStart = true;     # Do a line-start run without outputting an LF character
2656
2657                 while ( true ) {
2658                         if ( $findOnlyinclude ) {
2659                                 // Ignore all input up to the next <onlyinclude>
2660                                 $startPos = strpos( $text, '<onlyinclude>', $i );
2661                                 if ( $startPos === false ) {
2662                                         // Ignored section runs to the end
2663                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i ) ) . '</ignore>';
2664                                         break;
2665                                 }
2666                                 $tagEndPos = $startPos + strlen( '<onlyinclude>' ); // past-the-end
2667                                 $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i, $tagEndPos - $i ) ) . '</ignore>';
2668                                 $i = $tagEndPos;
2669                                 $findOnlyinclude = false;
2670                         }
2671
2672                         if ( $fakeLineStart ) {
2673                                 $found = 'line-start';
2674                                 $curChar = '';
2675                         } else {
2676                                 # Find next opening brace, closing brace or pipe
2677                                 $search = $searchBase;
2678                                 if ( $stack->top === false ) {
2679                                         $currentClosing = '';
2680                                 } else {
2681                                         $currentClosing = $stack->top->close;
2682                                         $search .= $currentClosing;
2683                                 }
2684                                 if ( $findPipe ) {
2685                                         $search .= '|';
2686                                 }
2687                                 if ( $findEquals ) {
2688                                         // First equals will be for the template
2689                                         $search .= '=';
2690                                 } else {
2691                                         // Look for headings
2692                                         // We can't look for headings when $findEquals is true, because the ambiguity
2693                                         // between template name/value separators and heading starts would be unresolved
2694                                         // until the closing double-brace is found. This would mean either infinite
2695                                         // backtrack, or creating and updating two separate tree structures until the
2696                                         // end of the ambiguity -- one tree structure assuming a heading, and the other
2697                                         // assuming a template argument.
2698                                         //
2699                                         // Easier to just break some section edit links.
2700                                         $search .= "\n";
2701                                 }
2702                                 $rule = null;
2703                                 # Output literal section, advance input counter
2704                                 $literalLength = strcspn( $text, $search, $i );
2705                                 if ( $literalLength > 0 ) {
2706                                         $accum .= htmlspecialchars( substr( $text, $i, $literalLength ) );
2707                                         $i += $literalLength;
2708                                 }
2709                                 if ( $i >= strlen( $text ) ) {
2710                                         if ( $currentClosing == "\n" ) {
2711                                                 // Do a past-the-end run to finish off the heading
2712                                                 $curChar = '';
2713                                                 $found = 'line-end';
2714                                         } else {
2715                                                 # All done
2716                                                 break;
2717                                         }
2718                                 } else {
2719                                         $curChar = $text[$i];
2720                                         if ( $curChar == '|' ) {
2721                                                 $found = 'pipe';
2722                                         } elseif ( $curChar == '=' ) {
2723                                                 $found = 'equals';
2724                                         } elseif ( $curChar == '<' ) {
2725                                                 $found = 'angle';
2726                                         } elseif ( $curChar == "\n" ) {
2727                                                 if ( $inHeading ) {
2728                                                         $found = 'line-end';
2729                                                 } else {
2730                                                         $found = 'line-start';
2731                                                 }
2732                                         } elseif ( $curChar == $currentClosing ) {
2733                                                 $found = 'close';
2734                                         } elseif ( isset( $rules[$curChar] ) ) {
2735                                                 $found = 'open';
2736                                                 $rule = $rules[$curChar];
2737                                         } else {
2738                                                 # Some versions of PHP have a strcspn which stops on null characters
2739                                                 # Ignore and continue
2740                                                 ++$i;
2741                                                 continue;
2742                                         }
2743                                 }
2744                         }
2745
2746                         if ( $found == 'angle' ) {
2747                                 $matches = false;
2748                                 // Handle </onlyinclude>
2749                                 if ( $enableOnlyinclude && substr( $text, $i, strlen( '</onlyinclude>' ) ) == '</onlyinclude>' ) {
2750                                         $findOnlyinclude = true;
2751                                         continue;
2752                                 }
2753
2754                                 // Determine element name
2755                                 if ( !preg_match( $elementsRegex, $text, $matches, 0, $i + 1 ) ) {
2756                                         // Element name missing or not listed
2757                                         $accum .= '&lt;';
2758                                         ++$i;
2759                                         continue;
2760                                 }
2761                                 // Handle comments
2762                                 if ( isset( $matches[2] ) && $matches[2] == '!--' ) {
2763                                         // To avoid leaving blank lines, when a comment is both preceded
2764                                         // and followed by a newline (ignoring spaces), trim leading and
2765                                         // trailing spaces and one of the newlines.
2766
2767                                         // Find the end
2768                                         $endPos = strpos( $text, '-->', $i + 4 );
2769                                         if ( $endPos === false ) {
2770                                                 // Unclosed comment in input, runs to end
2771                                                 $inner = substr( $text, $i );
2772                                                 $accum .= '<comment>' . htmlspecialchars( $inner ) . '</comment>';
2773                                                 $i = strlen( $text );
2774                                         } else {
2775                                                 // Search backwards for leading whitespace
2776                                                 $wsStart = $i ? ( $i - strspn( $revText, ' ', strlen( $text ) - $i ) ) : 0;
2777                                                 // Search forwards for trailing whitespace
2778                                                 // $wsEnd will be the position of the last space
2779                                                 $wsEnd = $endPos + 2 + strspn( $text, ' ', $endPos + 3 );
2780                                                 // Eat the line if possible
2781                                                 // TODO: This could theoretically be done if $wsStart == 0, i.e. for comments at
2782                                                 // the overall start. That's not how Sanitizer::removeHTMLcomments() does it, but
2783                                                 // it's a possible beneficial b/c break.
2784                                                 if ( $wsStart > 0 && substr( $text, $wsStart - 1, 1 ) == "\n"
2785                                                         && substr( $text, $wsEnd + 1, 1 ) == "\n" )
2786                                                 {
2787                                                         $startPos = $wsStart;
2788                                                         $endPos = $wsEnd + 1;
2789                                                         // Remove leading whitespace from the end of the accumulator
2790                                                         // Sanity check first though
2791                                                         $wsLength = $i - $wsStart;
2792                                                         if ( $wsLength > 0 && substr( $accum, -$wsLength ) === str_repeat( ' ', $wsLength ) ) {
2793                                                                 $accum = substr( $accum, 0, -$wsLength );
2794                                                         }
2795                                                         // Do a line-start run next time to look for headings after the comment,
2796                                                         // but only if stack->top===false, because headings don't exist at deeper levels.
2797                                                         if ( $stack->top === false ) {
2798                                                                 $fakeLineStart = true;
2799                                                         }
2800                                                 } else {
2801                                                         // No line to eat, just take the comment itself
2802                                                         $startPos = $i;
2803                                                         $endPos += 2;
2804                                                 }
2805
2806                                                 $i = $endPos + 1;
2807                                                 $inner = substr( $text, $startPos, $endPos - $startPos + 1 );
2808                                                 $accum .= '<comment>' . htmlspecialchars( $inner ) . '</comment>';
2809                                         }
2810                                         continue;
2811                                 }
2812                                 $name = $matches[1];
2813                                 $attrStart = $i + strlen( $name ) + 1;
2814
2815                                 // Find end of tag
2816                                 $tagEndPos = $noMoreGT ? false : strpos( $text, '>', $attrStart );
2817                                 if ( $tagEndPos === false ) {
2818                                         // Infinite backtrack
2819                                         // Disable tag search to prevent worst-case O(N^2) performance
2820                                         $noMoreGT = true;
2821                                         $accum .= '&lt;';
2822                                         ++$i;
2823                                         continue;
2824                                 }
2825
2826                                 // Handle ignored tags
2827                                 if ( in_array( $name, $ignoredTags ) ) {
2828                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $i, $tagEndPos - $i + 1 ) ) . '</ignore>';
2829                                         $i = $tagEndPos + 1;
2830                                         continue;
2831                                 }
2832
2833                                 $tagStartPos = $i;
2834                                 if ( $text[$tagEndPos-1] == '/' ) {
2835                                         $attrEnd = $tagEndPos - 1;
2836                                         $inner = null;
2837                                         $i = $tagEndPos + 1;
2838                                         $close = '';
2839                                 } else {
2840                                         $attrEnd = $tagEndPos;
2841                                         // Find closing tag
2842                                         if ( preg_match( "/<\/$name\s*>/i", $text, $matches, PREG_OFFSET_CAPTURE, $tagEndPos + 1 ) ) {
2843                                                 $inner = substr( $text, $tagEndPos + 1, $matches[0][1] - $tagEndPos - 1 );
2844                                                 $i = $matches[0][1] + strlen( $matches[0][0] );
2845                                                 $close = '<close>' . htmlspecialchars( $matches[0][0] ) . '</close>';
2846                                         } else {
2847                                                 // No end tag -- let it run out to the end of the text.
2848                                                 $inner = substr( $text, $tagEndPos + 1 );
2849                                                 $i = strlen( $text );
2850                                                 $close = '';
2851                                         }
2852                                 }
2853                                 // <includeonly> and <noinclude> just become <ignore> tags
2854                                 if ( in_array( $name, $ignoredElements ) ) {
2855                                         $accum .= '<ignore>' . htmlspecialchars( substr( $text, $tagStartPos, $i - $tagStartPos ) )
2856                                                 . '</ignore>';
2857                                         continue;
2858                                 }
2859
2860                                 $accum .= '<ext>';
2861                                 if ( $attrEnd <= $attrStart ) {
2862                                         $attr = '';
2863                                 } else {
2864                                         $attr = substr( $text, $attrStart, $attrEnd - $attrStart );
2865                                 }
2866                                 $accum .= '<name>' . htmlspecialchars( $name ) . '</name>' .
2867                                         // Note that the attr element contains the whitespace between name and attribute,
2868                                         // this is necessary for precise reconstruction during pre-save transform.
2869                                         '<attr>' . htmlspecialchars( $attr ) . '</attr>';
2870                                 if ( $inner !== null ) {
2871                                         $accum .= '<inner>' . htmlspecialchars( $inner ) . '</inner>';
2872                                 }
2873                                 $accum .= $close . '</ext>';
2874                         }
2875
2876                         elseif ( $found == 'line-start' ) {
2877                                 // Is this the start of a heading?
2878                                 // Line break belongs before the heading element in any case
2879                                 if ( $fakeLineStart ) {
2880                                         $fakeLineStart = false;
2881                                 } else {
2882                                         $accum .= $curChar;
2883                                         $i++;
2884                                 }
2885
2886                                 $count = strspn( $text, '=', $i, 6 );
2887                                 if ( $count > 0 ) {
2888                                         $piece = array(
2889                                                 'open' => "\n",
2890                                                 'close' => "\n",
2891                                                 'parts' => array( str_repeat( '=', $count ) ),
2892                                                 'startPos' => $i,
2893                                                 'count' => $count );
2894                                         $stack->push( $piece );
2895                                         $accum =& $stack->getAccum();
2896                                         extract( $stack->getFlags() );
2897                                         $i += $count;
2898                                 }
2899                         }
2900
2901                         elseif ( $found == 'line-end' ) {
2902                                 $piece = $stack->top;
2903                                 // A heading must be open, otherwise \n wouldn't have been in the search list
2904                                 assert( $piece->open == "\n" );
2905                                 // Search back through the input to see if it has a proper close
2906                                 // Do this using the reversed string since the other solutions (end anchor, etc.) are inefficient
2907                                 $m = false;
2908                                 $count = $piece->count;
2909                                 if ( preg_match( "/\s*(={{$count}})/A", $revText, $m, 0, strlen( $text ) - $i ) ) {
2910                                         if ( $i - strlen( $m[0] ) == $piece->startPos ) {
2911                                                 // This is just a single string of equals signs on its own line
2912                                                 // Replicate the doHeadings behaviour /={count}(.+)={count}/
2913                                                 if ( $count < 3 ) {
2914                                                         $count = 0;
2915                                                 } elseif ( $count % 2 ) {
2916                                                         $count = ( $count - 1 ) / 2;
2917                                                 } else {
2918                                                         $count = $count / 2 - 1;
2919                                                 }
2920                                         } else {
2921                                                 $count = min( strlen( $m[1] ), $count );
2922                                         }
2923                                         if ( $count > 0 ) {
2924                                                 // Normal match, output <h>
2925                                                 $element = "<h level=\"$count\" i=\"$headingIndex\">$accum</h>";
2926                                                 $headingIndex++;
2927                                         } else {
2928                                                 // Single equals sign on its own line, count=0
2929                                                 $element = $accum;
2930                                         }
2931                                 } else {
2932                                         // No match, no <h>, just pass down the inner text
2933                                         $element = $accum;
2934                                 }
2935                                 // Unwind the stack
2936                                 $stack->pop();
2937                                 $accum =& $stack->getAccum();
2938                                 extract( $stack->getFlags() );
2939
2940                                 // Append the result to the enclosing accumulator
2941                                 $accum .= $element;
2942                                 // Note that we do NOT increment the input pointer.
2943                                 // This is because the closing linebreak could be the opening linebreak of
2944                                 // another heading. Infinite loops are avoided because the next iteration MUST
2945                                 // hit the heading open case above, which unconditionally increments the
2946                                 // input pointer.
2947                         }
2948
2949                         elseif ( $found == 'open' ) {
2950                                 # count opening brace characters
2951                                 $count = strspn( $text, $curChar, $i );
2952
2953                                 # we need to add to stack only if opening brace count is enough for one of the rules
2954                                 if ( $count >= $rule['min'] ) {
2955                                         # Add it to the stack
2956                                         $piece = array(
2957                                                 'open' => $curChar,
2958                                                 'close' => $rule['end'],
2959                                                 'count' => $count,
2960                                                 'parts' => array( '' ),
2961                                                 'eqpos' => array(),
2962                                                 'lineStart' => ($i > 0 && $text[$i-1] == "\n"),
2963                                         );
2964
2965                                         $stack->push( $piece );
2966                                         $accum =& $stack->getAccum();
2967                                         extract( $stack->getFlags() );
2968                                 } else {
2969                                         # Add literal brace(s)
2970                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
2971                                 }
2972                                 $i += $count;
2973                         }
2974
2975                         elseif ( $found == 'close' ) {
2976                                 $piece = $stack->top;
2977                                 # lets check if there are enough characters for closing brace
2978                                 $maxCount = $piece->count;
2979                                 $count = strspn( $text, $curChar, $i, $maxCount );
2980
2981                                 # check for maximum matching characters (if there are 5 closing
2982                                 # characters, we will probably need only 3 - depending on the rules)
2983                                 $matchingCount = 0;
2984                                 $rule = $rules[$piece->open];
2985                                 if ( $count > $rule['max'] ) {
2986                                         # The specified maximum exists in the callback array, unless the caller
2987                                         # has made an error
2988                                         $matchingCount = $rule['max'];
2989                                 } else {
2990                                         # Count is less than the maximum
2991                                         # Skip any gaps in the callback array to find the true largest match
2992                                         # Need to use array_key_exists not isset because the callback can be null
2993                                         $matchingCount = $count;
2994                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $rule['names'] ) ) {
2995                                                 --$matchingCount;
2996                                         }
2997                                 }
2998
2999                                 if ($matchingCount <= 0) {
3000                                         # No matching element found in callback array
3001                                         # Output a literal closing brace and continue
3002                                         $accum .= htmlspecialchars( str_repeat( $curChar, $count ) );
3003                                         $i += $count;
3004                                         continue;
3005                                 }
3006                                 $name = $rule['names'][$matchingCount];
3007                                 if ( $name === null ) {
3008                                         // No element, just literal text
3009                                         $element = str_repeat( $piece->open, $matchingCount ) .
3010                                                 implode( '|', $piece->parts ) .
3011                                                 str_repeat( $rule['end'], $matchingCount );
3012                                 } else {
3013                                         # Create XML element
3014                                         # Note: $parts is already XML, does not need to be encoded further
3015                                         $parts = $piece->parts;
3016                                         $title = $parts[0];
3017                                         unset( $parts[0] );
3018
3019                                         # The invocation is at the start of the line if lineStart is set in
3020                                         # the stack, and all opening brackets are used up.
3021                                         if ( $maxCount == $matchingCount && !empty( $piece->lineStart ) ) {
3022                                                 $attr = ' lineStart="1"';
3023                                         } else {
3024                                                 $attr = '';
3025                                         }
3026
3027                                         $element = "<$name$attr>";
3028                                         $element .= "<title>$title</title>";
3029                                         $argIndex = 1;
3030                                         foreach ( $parts as $partIndex => $part ) {
3031                                                 if ( isset( $piece->eqpos[$partIndex] ) ) {
3032                                                         $eqpos = $piece->eqpos[$partIndex];
3033                                                         $argName = substr( $part, 0, $eqpos );
3034                                                         $argValue = substr( $part, $eqpos + 1 );
3035                                                         $element .= "<part><name>$argName</name>=<value>$argValue</value></part>";
3036                                                 } else {
3037                                                         $element .= "<part><name index=\"$argIndex\" /><value>$part</value></part>";
3038                                                         $argIndex++;
3039                                                 }
3040                                         }
3041                                         $element .= "</$name>";
3042                                 }
3043
3044                                 # Advance input pointer
3045                                 $i += $matchingCount;
3046
3047                                 # Unwind the stack
3048                                 $stack->pop();
3049                                 $accum =& $stack->getAccum();
3050
3051                                 # Re-add the old stack element if it still has unmatched opening characters remaining
3052                                 if ($matchingCount < $piece->count) {
3053                                         $piece->parts = array( '' );
3054                                         $piece->count -= $matchingCount;
3055                                         $piece->eqpos = array();
3056                                         # do we still qualify for any callback with remaining count?
3057                                         $names = $rules[$piece->open]['names'];
3058                                         $skippedBraces = 0;
3059                                         $enclosingAccum =& $accum;
3060                                         while ( $piece->count ) {
3061                                                 if ( array_key_exists( $piece->count, $names ) ) {
3062                                                         $stack->push( $piece );
3063                                                         $accum =& $stack->getAccum();
3064                                                         break;
3065                                                 }
3066                                                 --$piece->count;
3067                                                 $skippedBraces ++;
3068                                         }
3069                                         $enclosingAccum .= str_repeat( $piece->open, $skippedBraces );
3070                                 }
3071
3072                                 extract( $stack->getFlags() );
3073
3074                                 # Add XML element to the enclosing accumulator
3075                                 $accum .= $element;
3076                         }
3077
3078                         elseif ( $found == 'pipe' ) {
3079                                 $findEquals = true; // shortcut for getFlags()
3080                                 $stack->top->addPart();
3081                                 $accum =& $stack->getAccum();
3082                                 ++$i;
3083                         }
3084
3085                         elseif ( $found == 'equals' ) {
3086                                 $findEquals = false; // shortcut for getFlags()
3087                                 $partsCount = count( $stack->top->parts );
3088                                 $stack->top->eqpos[$partsCount - 1] = strlen( $accum );
3089                                 $accum .= '=';
3090                                 ++$i;
3091                         }
3092                 }
3093
3094                 # Output any remaining unclosed brackets
3095                 foreach ( $stack->stack as $piece ) {
3096                         if ( $piece->open == "\n" ) {
3097                                 $stack->topAccum .= $piece->parts[0];
3098                         } else {
3099                                 $stack->topAccum .= str_repeat( $piece->open, $piece->count ) . implode( '|', $piece->parts );
3100                         }
3101                 }
3102                 $stack->topAccum .= '</root>';
3103                 $xml = $stack->topAccum;
3104
3105                 wfProfileOut( __METHOD__.'-makexml' );
3106                 wfProfileIn( __METHOD__.'-loadXML' );
3107                 $dom = new DOMDocument;
3108                 wfSuppressWarnings();
3109                 $result = $dom->loadXML( $xml );
3110                 wfRestoreWarnings();
3111                 if ( !$result ) {
3112                         // Try running the XML through UtfNormal to get rid of invalid characters
3113                         $xml = UtfNormal::cleanUp( $xml );
3114                         $result = $dom->loadXML( $xml );
3115                         if ( !$result ) {
3116                                 throw new MWException( __METHOD__.' generated invalid XML' );
3117                         }
3118                 }
3119                 wfProfileOut( __METHOD__.'-loadXML' );
3120                 wfProfileOut( __METHOD__ );
3121                 return $dom;
3122         }
3123
3124         /*
3125          * Return a three-element array: leading whitespace, string contents, trailing whitespace
3126          */
3127         public static function splitWhitespace( $s ) {
3128                 $ltrimmed = ltrim( $s );
3129                 $w1 = substr( $s, 0, strlen( $s ) - strlen( $ltrimmed ) );
3130                 $trimmed = rtrim( $ltrimmed );
3131                 $diff = strlen( $ltrimmed ) - strlen( $trimmed );
3132                 if ( $diff > 0 ) {
3133                         $w2 = substr( $ltrimmed, -$diff );
3134                 } else {
3135                         $w2 = '';
3136                 }
3137                 return array( $w1, $trimmed, $w2 );
3138         }
3139
3140         /**
3141          * Replace magic variables, templates, and template arguments
3142          * with the appropriate text. Templates are substituted recursively,
3143          * taking care to avoid infinite loops.
3144          *
3145          * Note that the substitution depends on value of $mOutputType:
3146          *  OT_WIKI: only {{subst:}} templates
3147          *  OT_PREPROCESS: templates but not extension tags
3148          *  OT_HTML: all templates and extension tags
3149          *
3150          * @param string $tex The text to transform
3151          * @param PPFrame $frame Object describing the arguments passed to the template
3152          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
3153          * @private
3154          */
3155         function replaceVariables( $text, $frame = false, $argsOnly = false ) {
3156                 # Prevent too big inclusions
3157                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
3158                         return $text;
3159                 }
3160
3161                 $fname = __METHOD__;
3162                 wfProfileIn( $fname );
3163
3164                 if ( $frame === false ) {
3165                         $frame = new PPFrame( $this );
3166                 } elseif ( !( $frame instanceof PPFrame ) ) {
3167                         throw new MWException( __METHOD__ . ' called using the old argument format' );
3168                 }
3169
3170                 $dom = $this->preprocessToDom( $text );
3171                 $flags = $argsOnly ? PPFrame::NO_TEMPLATES : 0;
3172                 $text = $frame->expand( $dom, $flags );
3173
3174                 wfProfileOut( $fname );
3175                 return $text;
3176         }
3177
3178         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
3179         static function createAssocArgs( $args ) {
3180                 $assocArgs = array();
3181                 $index = 1;
3182                 foreach( $args as $arg ) {
3183                         $eqpos = strpos( $arg, '=' );
3184                         if ( $eqpos === false ) {
3185                                 $assocArgs[$index++] = $arg;
3186                         } else {
3187                                 $name = trim( substr( $arg, 0, $eqpos ) );
3188                                 $value = trim( substr( $arg, $eqpos+1 ) );
3189                                 if ( $value === false ) {
3190                                         $value = '';
3191                                 }
3192                                 if ( $name !== false ) {
3193                                         $assocArgs[$name] = $value;
3194                                 }
3195                         }
3196                 }
3197
3198                 return $assocArgs;
3199         }
3200
3201         /**
3202          * Return the text of a template, after recursively
3203          * replacing any variables or templates within the template.
3204          *
3205          * @param array $piece The parts of the template
3206          *  $piece['text']: matched text
3207          *  $piece['title']: the title, i.e. the part before the |
3208          *  $piece['parts']: the parameter array
3209          * @param PPFrame The current frame, contains template arguments
3210          * @return string the text of the template
3211          * @private
3212          */
3213         function braceSubstitution( $piece, $frame ) {
3214                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
3215                 $fname = __METHOD__;
3216                 wfProfileIn( $fname );
3217                 wfProfileIn( __METHOD__.'-setup' );
3218
3219                 # Flags
3220                 $found = false;             # $text has been filled
3221                 $nowiki = false;            # wiki markup in $text should be escaped
3222                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
3223                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
3224                 $isDOM = false;             # $text is a DOM node needing expansion
3225
3226                 # Title object, where $text came from
3227                 $title = NULL;
3228
3229                 # $part1 is the bit before the first |, and must contain only title characters.
3230                 # Various prefixes will be stripped from it later.
3231                 $titleWithSpaces = $frame->expand( $piece['title'] );
3232                 $part1 = trim( $titleWithSpaces );
3233                 $titleText = false;
3234
3235                 # Original title text preserved for various purposes
3236                 $originalTitle = $part1;
3237
3238                 # $args is a list of argument nodes, starting from index 0, not including $part1
3239                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
3240                 wfProfileOut( __METHOD__.'-setup' );
3241
3242                 # SUBST
3243                 wfProfileIn( __METHOD__.'-modifiers' );
3244                 if ( !$found ) {
3245                         $mwSubst =& MagicWord::get( 'subst' );
3246                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
3247                                 # One of two possibilities is true:
3248                                 # 1) Found SUBST but not in the PST phase
3249                                 # 2) Didn't find SUBST and in the PST phase
3250                                 # In either case, return without further processing
3251                                 $text = '{{' . $frame->implode( '|', $titleWithSpaces, $args ) . '}}';
3252                                 $found = true;
3253                         }
3254                 }
3255
3256                 # Variables
3257                 if ( !$found && $args->length == 0 ) {
3258                         $id = $this->mVariables->matchStartToEnd( $part1 );
3259                         if ( $id !== false ) {
3260                                 $text = $this->getVariableValue( $id );
3261                                 if (MagicWord::getCacheTTL($id)>-1)
3262                                         $this->mOutput->mContainsOldMagic = true;
3263                                 $found = true;
3264                         }
3265                 }
3266
3267                 # MSG, MSGNW and RAW
3268                 if ( !$found ) {
3269                         # Check for MSGNW:
3270                         $mwMsgnw =& MagicWord::get( 'msgnw' );
3271                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
3272                                 $nowiki = true;
3273                         } else {
3274                                 # Remove obsolete MSG:
3275                                 $mwMsg =& MagicWord::get( 'msg' );
3276                                 $mwMsg->matchStartAndRemove( $part1 );
3277                         }
3278
3279                         # Check for RAW:
3280                         $mwRaw =& MagicWord::get( 'raw' );
3281                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
3282                                 $forceRawInterwiki = true;
3283                         }
3284                 }
3285                 wfProfileOut( __METHOD__.'-modifiers' );
3286
3287                 # Parser functions
3288                 if ( !$found ) {
3289                         wfProfileIn( __METHOD__ . '-pfunc' );
3290
3291                         $colonPos = strpos( $part1, ':' );
3292                         if ( $colonPos !== false ) {
3293                                 # Case sensitive functions
3294                                 $function = substr( $part1, 0, $colonPos );
3295                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
3296                                         $function = $this->mFunctionSynonyms[1][$function];
3297                                 } else {
3298                                         # Case insensitive functions
3299                                         $function = strtolower( $function );
3300                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
3301                                                 $function = $this->mFunctionSynonyms[0][$function];
3302                                         } else {
3303                                                 $function = false;
3304                                         }
3305                                 }
3306                                 if ( $function ) {
3307                                         list( $callback, $flags ) = $this->mFunctionHooks[$function];
3308                                         $initialArgs = array( &$this );
3309                                         $funcArgs = array( trim( substr( $part1, $colonPos + 1 ) ) );
3310                                         if ( $flags & SFH_OBJECT_ARGS ) {
3311                                                 # Add a frame parameter, and pass the arguments as an array
3312                                                 $allArgs = $initialArgs;
3313                                                 $allArgs[] = $frame;
3314                                                 foreach ( $args as $arg ) {
3315                                                         $funcArgs[] = $arg;
3316                                                 }
3317                                                 $allArgs[] = $funcArgs;
3318                                         } else {
3319                                                 # Convert arguments to plain text
3320                                                 foreach ( $args as $arg ) {
3321                                                         $funcArgs[] = trim( $frame->expand( $arg ) );
3322                                                 }
3323                                                 $allArgs = array_merge( $initialArgs, $funcArgs );
3324                                         }
3325
3326                                         $result = call_user_func_array( $callback, $allArgs );
3327                                         $found = true;
3328
3329                                         if ( is_array( $result ) ) {
3330                                                 if ( isset( $result[0] ) ) {
3331                                                         $text = $result[0];
3332                                                         unset( $result[0] );
3333                                                 }
3334
3335                                                 // Extract flags into the local scope
3336                                                 // This allows callers to set flags such as nowiki, found, etc.
3337                                                 extract( $result );
3338                                         } else {
3339                                                 $text = $result;
3340                                         }
3341                                 }
3342                         }
3343                         wfProfileOut( __METHOD__ . '-pfunc' );
3344                 }
3345
3346                 # Finish mangling title and then check for loops.
3347                 # Set $title to a Title object and $titleText to the PDBK
3348                 if ( !$found ) {
3349                         $ns = NS_TEMPLATE;
3350                         # Split the title into page and subpage
3351                         $subpage = '';
3352                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3353                         if ($subpage !== '') {
3354                                 $ns = $this->mTitle->getNamespace();
3355                         }
3356                         $title = Title::newFromText( $part1, $ns );
3357                         if ( $title ) {
3358                                 $titleText = $title->getPrefixedText();
3359                                 # Check for language variants if the template is not found
3360                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3361                                         $wgContLang->findVariantLink($part1, $title);
3362                                 }
3363                                 # Do infinite loop check
3364                                 if ( !$frame->loopCheck( $title ) ) {
3365                                         $found = true;
3366                                         $text = "<span class=\"error\">Template loop detected: [[$titleText]]</span>";
3367                                         wfDebug( __METHOD__.": template loop broken at '$titleText'\n" );
3368                                 }
3369                                 # Do recursion depth check
3370                                 $limit = $this->mOptions->getMaxTemplateDepth();
3371                                 if ( $frame->depth >= $limit ) {
3372                                         $found = true;
3373                                         $text = "<span class=\"error\">Template recursion depth limit exceeded ($limit)</span>";
3374                                 }
3375                         }
3376                 }
3377
3378                 # Load from database
3379                 if ( !$found && $title ) {
3380                         wfProfileIn( __METHOD__ . '-loadtpl' );
3381                         if ( !$title->isExternal() ) {
3382                                 if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3383                                         $text = SpecialPage::capturePath( $title );
3384                                         if ( is_string( $text ) ) {
3385                                                 $found = true;
3386                                                 $isHTML = true;
3387                                                 $this->disableCache();
3388                                         }
3389                                 } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3390                                         $found = false; //access denied
3391                                         wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3392                                 } else {
3393                                         list( $text, $title ) = $this->getTemplateDom( $title );
3394                                         if ( $text !== false ) {
3395                                                 $found = true;
3396                                                 $isDOM = true;
3397                                         }
3398                                 }
3399
3400                                 # If the title is valid but undisplayable, make a link to it
3401                                 if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3402                                         $text = "[[:$titleText]]";
3403                                         $found = true;
3404                                 }
3405                         } elseif ( $title->isTrans() ) {
3406                                 // Interwiki transclusion
3407                                 if ( $this->ot['html'] && !$forceRawInterwiki ) {
3408                                         $text = $this->interwikiTransclude( $title, 'render' );
3409                                         $isHTML = true;
3410                                 } else {
3411                                         $text = $this->interwikiTransclude( $title, 'raw' );
3412                                         // Preprocess it like a template
3413                                         $text = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3414                                         $isDOM = true;
3415                                 }
3416                                 $found = true;
3417                         }
3418                         wfProfileOut( __METHOD__ . '-loadtpl' );
3419                 }
3420
3421                 # If we haven't found text to substitute by now, we're done
3422                 # Recover the source wikitext and return it
3423                 if ( !$found ) {
3424                         $text = '{{' . $frame->implode( '|', $titleWithSpaces, $args ) . '}}';
3425                         wfProfileOut( $fname );
3426                         return $text;
3427                 }
3428
3429                 # Expand DOM-style return values in a child frame
3430                 if ( $isDOM ) {
3431                         # Clean up argument array
3432                         $newFrame = $frame->newChild( $args, $title );
3433
3434                         if ( $titleText !== false && $newFrame->isEmpty() ) {
3435                                 # Expansion is eligible for the empty-frame cache
3436                                 if ( isset( $this->mTplExpandCache[$titleText] ) ) {
3437                                         $text = $this->mTplExpandCache[$titleText];
3438                                 } else {
3439                                         $text = $newFrame->expand( $text );
3440                                         $this->mTplExpandCache[$titleText] = $text;
3441                                 }
3442                         } else {
3443                                 # Uncached expansion
3444                                 $text = $newFrame->expand( $text );
3445                         }
3446                 }
3447
3448                 # Replace raw HTML by a placeholder
3449                 # Add a blank line preceding, to prevent it from mucking up
3450                 # immediately preceding headings
3451                 if ( $isHTML ) {
3452                         $text = "\n\n" . $this->insertStripItem( $text );
3453                 }
3454                 # Escape nowiki-style return values
3455                 elseif ( $nowiki && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3456                         $text = wfEscapeWikiText( $text );
3457                 }
3458                 # Bug 529: if the template begins with a table or block-level
3459                 # element, it should be treated as beginning a new line.
3460                 # This behaviour is somewhat controversial.
3461                 elseif ( !$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3462                         $text = "\n" . $text;
3463                 }
3464
3465                 if ( !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3466                         # Error, oversize inclusion
3467                         $text = "[[$originalTitle]]" .
3468                                 $this->insertStripItem( '<!-- WARNING: template omitted, post-expand include size too large -->' );
3469                 }
3470
3471                 wfProfileOut( $fname );
3472                 return $text;
3473         }
3474
3475         /**
3476          * Get the semi-parsed DOM representation of a template with a given title,
3477          * and its redirect destination title. Cached.
3478          */
3479         function getTemplateDom( $title ) {
3480                 $cacheTitle = $title;
3481                 $titleText = $title->getPrefixedDBkey();
3482
3483                 if ( isset( $this->mTplRedirCache[$titleText] ) ) {
3484                         list( $ns, $dbk ) = $this->mTplRedirCache[$titleText];
3485                         $title = Title::makeTitle( $ns, $dbk );
3486                         $titleText = $title->getPrefixedDBkey();
3487                 }
3488                 if ( isset( $this->mTplDomCache[$titleText] ) ) {
3489                         return array( $this->mTplDomCache[$titleText], $title );
3490                 }
3491
3492                 // Cache miss, go to the database
3493                 list( $text, $title ) = $this->fetchTemplateAndTitle( $title );
3494
3495                 if ( $text === false ) {
3496                         $this->mTplDomCache[$titleText] = false;
3497                         return array( false, $title );
3498                 }
3499
3500                 $dom = $this->preprocessToDom( $text, self::PTD_FOR_INCLUSION );
3501                 $this->mTplDomCache[ $titleText ] = $dom;
3502
3503                 if (! $title->equals($cacheTitle)) {
3504                         $this->mTplRedirCache[$cacheTitle->getPrefixedDBkey()] =
3505                                 array( $title->getNamespace(),$cdb = $title->getDBkey() );
3506                 }
3507
3508                 return array( $dom, $title );
3509         }
3510
3511         /**
3512          * Fetch the unparsed text of a template and register a reference to it.
3513          */
3514         function fetchTemplateAndTitle( $title ) {
3515                 $templateCb = $this->mOptions->getTemplateCallback();
3516                 $stuff = call_user_func( $templateCb, $title );
3517                 $text = $stuff['text'];
3518                 $finalTitle = isset( $stuff['finalTitle'] ) ? $stuff['finalTitle'] : $title;
3519                 if ( isset( $stuff['deps'] ) ) {
3520                         foreach ( $stuff['deps'] as $dep ) {
3521                                 $this->mOutput->addTemplate( $dep['title'], $dep['page_id'], $dep['rev_id'] );
3522                         }
3523                 }
3524                 return array($text,$finalTitle);
3525         }
3526
3527         function fetchTemplate( $title ) {
3528                 $rv = $this->fetchTemplateAndTitle($title);
3529                 return $rv[0];
3530         }
3531
3532         /**
3533          * Static function to get a template
3534          * Can be overridden via ParserOptions::setTemplateCallback().
3535          */
3536         static function statelessFetchTemplate( $title ) {
3537                 $text = $skip = false;
3538                 $finalTitle = $title;
3539                 $deps = array();
3540
3541                 // Loop to fetch the article, with up to 1 redirect
3542                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3543                         # Give extensions a chance to select the revision instead
3544                         $id = false; // Assume current
3545                         wfRunHooks( 'BeforeParserFetchTemplateAndtitle', array( false, &$title, &$skip, &$id ) );
3546
3547                         if( $skip ) {
3548                                 $text = false;
3549                                 $deps[] = array(
3550                                         'title' => $title,
3551                                         'page_id' => $title->getArticleID(),
3552                                         'rev_id' => null );
3553                                 break;
3554                         }
3555                         $rev = $id ? Revision::newFromId( $id ) : Revision::newFromTitle( $title );
3556                         $rev_id = $rev ? $rev->getId() : 0;
3557
3558                         $deps[] = array(
3559                                 'title' => $title,
3560                                 'page_id' => $title->getArticleID(),
3561                                 'rev_id' => $rev_id );
3562
3563                         if( $rev ) {
3564                                 $text = $rev->getText();
3565                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3566                                 global $wgLang;
3567                                 $message = $wgLang->lcfirst( $title->getText() );
3568                                 $text = wfMsgForContentNoTrans( $message );
3569                                 if( wfEmptyMsg( $message, $text ) ) {
3570                                         $text = false;
3571                                         break;
3572                                 }
3573                         } else {
3574                                 break;
3575                         }
3576                         if ( $text === false ) {
3577                                 break;
3578                         }
3579                         // Redirect?
3580                         $finalTitle = $title;
3581                         $title = Title::newFromRedirect( $text );
3582                 }
3583                 return array(
3584                         'text' => $text,
3585                         'finalTitle' => $finalTitle,
3586                         'deps' => $deps );
3587         }
3588
3589         /**
3590          * Transclude an interwiki link.
3591          */
3592         function interwikiTransclude( $title, $action ) {
3593                 global $wgEnableScaryTranscluding;
3594
3595                 if (!$wgEnableScaryTranscluding)
3596                         return wfMsg('scarytranscludedisabled');
3597
3598                 $url = $title->getFullUrl( "action=$action" );
3599
3600                 if (strlen($url) > 255)
3601                         return wfMsg('scarytranscludetoolong');
3602                 return $this->fetchScaryTemplateMaybeFromCache($url);
3603         }
3604
3605         function fetchScaryTemplateMaybeFromCache($url) {
3606                 global $wgTranscludeCacheExpiry;
3607                 $dbr = wfGetDB(DB_SLAVE);
3608                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3609                                 array('tc_url' => $url));
3610                 if ($obj) {
3611                         $time = $obj->tc_time;
3612                         $text = $obj->tc_contents;
3613                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3614                                 return $text;
3615                         }
3616                 }
3617
3618                 $text = Http::get($url);
3619                 if (!$text)
3620                         return wfMsg('scarytranscludefailed', $url);
3621
3622                 $dbw = wfGetDB(DB_MASTER);
3623                 $dbw->replace('transcache', array('tc_url'), array(
3624                         'tc_url' => $url,
3625                         'tc_time' => time(),
3626                         'tc_contents' => $text));
3627                 return $text;
3628         }
3629
3630
3631         /**
3632          * Triple brace replacement -- used for template arguments
3633          * @private
3634          */
3635         function argSubstitution( $piece, $frame ) {
3636                 wfProfileIn( __METHOD__ );
3637
3638                 $error = false;
3639                 $parts = $piece['parts'];
3640                 $nameWithSpaces = $frame->expand( $piece['title'] );
3641                 $argName = trim( $nameWithSpaces );
3642
3643                 $text = $frame->getArgument( $argName );
3644                 if (  $text === false && ( $this->ot['html'] || $this->ot['pre'] ) && $parts->length > 0 ) {
3645                         # No match in frame, use the supplied default
3646                         $text = $frame->expand( $parts->item( 0 ) );
3647                 }
3648                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3649                         $error = '<!-- WARNING: argument omitted, expansion size too large -->';
3650                 }
3651
3652                 if ( $text === false ) {
3653                         # No match anywhere
3654                         $text = '{{{' . $frame->implode( '|', $nameWithSpaces, $parts ) . '}}}';
3655                 }
3656                 if ( $error !== false ) {
3657                         $text .= $error;
3658                 }
3659
3660                 wfProfileOut( __METHOD__ );
3661                 return $text;
3662         }
3663
3664         /**
3665          * Return the text to be used for a given extension tag.
3666          * This is the ghost of strip().
3667          *
3668          * @param array $params Associative array of parameters:
3669          *     name       DOMNode for the tag name
3670          *     attr       DOMNode for unparsed text where tag attributes are thought to be
3671          *     attributes Optional associative array of parsed attributes
3672          *     inner      Contents of extension element
3673          *     noClose    Original text did not have a close tag
3674          * @param PPFrame $frame
3675          */
3676         function extensionSubstitution( $params, $frame ) {
3677                 global $wgRawHtml, $wgContLang;
3678                 static $n = 1;
3679
3680                 $name = $frame->expand( $params['name'] );
3681                 $attrText = !isset( $params['attr'] ) ? null : $frame->expand( $params['attr'] );
3682                 $content = !isset( $params['inner'] ) ? null : $frame->expand( $params['inner'] );
3683
3684                 $marker = "{$this->mUniqPrefix}-$name-" . sprintf('%08X', $n++) . $this->mMarkerSuffix;
3685
3686                 if ( $this->ot['html'] ) {
3687                         $name = strtolower( $name );
3688
3689                         $attributes = Sanitizer::decodeTagAttributes( $attrText );
3690                         if ( isset( $params['attributes'] ) ) {
3691                                 $attributes = $attributes + $params['attributes'];
3692                         }
3693                         switch ( $name ) {
3694                                 case 'html':
3695                                         if( $wgRawHtml ) {
3696                                                 $output = $content;
3697                                                 break;
3698                                         } else {
3699                                                 throw new MWException( '<html> extension tag encountered unexpectedly' );
3700                                         }
3701                                 case 'nowiki':
3702                                         $output = Xml::escapeTagsOnly( $content );
3703                                         break;
3704                                 case 'math':
3705                                         $output = $wgContLang->armourMath(
3706                                                 MathRenderer::renderMath( $content, $attributes ) );
3707                                         break;
3708                                 case 'gallery':
3709                                         $output = $this->renderImageGallery( $content, $attributes );
3710                                         break;
3711                                 default:
3712                                         if( isset( $this->mTagHooks[$name] ) ) {
3713                                                 $output = call_user_func_array( $this->mTagHooks[$name],
3714                                                         array( $content, $attributes, $this ) );
3715                                         } else {
3716                                                 throw new MWException( "Invalid call hook $name" );
3717                                         }
3718                         }
3719                 } else {
3720                         if ( is_null( $attrText ) ) {
3721                                 $attrText = '';
3722                         }
3723                         if ( isset( $params['attributes'] ) ) {
3724                                 foreach ( $params['attributes'] as $attrName => $attrValue ) {
3725                                         $attrText .= ' ' . htmlspecialchars( $attrName ) . '="' .
3726                                                 htmlspecialchars( $attrValue ) . '"';
3727                                 }
3728                         }
3729                         if ( $content === null ) {
3730                                 $output = "<$name$attrText/>";
3731                         } else {
3732                                 $close = is_null( $params['close'] ) ? '' : $frame->expand( $params['close'] );
3733                                 $output = "<$name$attrText>$content$close";
3734                         }
3735                 }
3736
3737                 if ( $name == 'html' || $name == 'nowiki' ) {
3738                         $this->mStripState->nowiki->setPair( $marker, $output );
3739                 } else {
3740                         $this->mStripState->general->setPair( $marker, $output );
3741                 }
3742                 return $marker;
3743         }
3744
3745         /**
3746          * Increment an include size counter
3747          *
3748          * @param string $type The type of expansion
3749          * @param integer $size The size of the text
3750          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3751          */
3752         function incrementIncludeSize( $type, $size ) {
3753                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize( $type ) ) {
3754                         return false;
3755                 } else {
3756                         $this->mIncludeSizes[$type] += $size;
3757                         return true;
3758                 }
3759         }
3760
3761         /**
3762          * Detect __NOGALLERY__ magic word and set a placeholder
3763          */
3764         function stripNoGallery( &$text ) {
3765                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3766                 # do not add TOC
3767                 $mw = MagicWord::get( 'nogallery' );
3768                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3769         }
3770
3771         /**
3772          * Find the first __TOC__ magic word and set a <!--MWTOC-->
3773          * placeholder that will then be replaced by the real TOC in
3774          * ->formatHeadings, this works because at this points real
3775          * comments will have already been discarded by the sanitizer.
3776          *
3777          * Any additional __TOC__ magic words left over will be discarded
3778          * as there can only be one TOC on the page.
3779          */
3780         function stripToc( $text ) {
3781                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3782                 # do not add TOC
3783                 $mw = MagicWord::get( 'notoc' );
3784                 if( $mw->matchAndRemove( $text ) ) {
3785                         $this->mShowToc = false;
3786                 }
3787
3788                 $mw = MagicWord::get( 'toc' );
3789                 if( $mw->match( $text ) ) {
3790                         $this->mShowToc = true;
3791                         $this->mForceTocPosition = true;
3792
3793                         // Set a placeholder. At the end we'll fill it in with the TOC.
3794                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3795
3796                         // Only keep the first one.
3797                         $text = $mw->replace( '', $text );
3798                 }
3799                 return $text;
3800         }
3801
3802         /**
3803          * This function accomplishes several tasks:
3804          * 1) Auto-number headings if that option is enabled
3805          * 2) Add an [edit] link to sections for users who have enabled the option and can edit the page
3806          * 3) Add a Table of contents on the top for users who have enabled the option
3807          * 4) Auto-anchor headings
3808          *
3809          * It loops through all headlines, collects the necessary data, then splits up the
3810          * string and re-inserts the newly formatted headlines.
3811          *
3812          * @param string $text
3813          * @param boolean $isMain
3814          * @private
3815          */
3816         function formatHeadings( $text, $isMain=true ) {
3817                 global $wgMaxTocLevel, $wgContLang;
3818
3819                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3820                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3821                         $showEditLink = 0;
3822                 } else {
3823                         $showEditLink = $this->mOptions->getEditSection();
3824                 }
3825
3826                 # Inhibit editsection links if requested in the page
3827                 $esw =& MagicWord::get( 'noeditsection' );
3828                 if( $esw->matchAndRemove( $text ) ) {
3829                         $showEditLink = 0;
3830                 }
3831
3832                 # Get all headlines for numbering them and adding funky stuff like [edit]
3833                 # links - this is for later, but we need the number of headlines right now
3834                 $matches = array();
3835                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3836
3837                 # if there are fewer than 4 headlines in the article, do not show TOC
3838                 # unless it's been explicitly enabled.
3839                 $enoughToc = $this->mShowToc &&
3840                         (($numMatches >= 4) || $this->mForceTocPosition);
3841
3842                 # Allow user to stipulate that a page should have a "new section"
3843                 # link added via __NEWSECTIONLINK__
3844                 $mw =& MagicWord::get( 'newsectionlink' );
3845                 if( $mw->matchAndRemove( $text ) )
3846                         $this->mOutput->setNewSection( true );
3847
3848                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3849                 # override above conditions and always show TOC above first header
3850                 $mw =& MagicWord::get( 'forcetoc' );
3851                 if ($mw->matchAndRemove( $text ) ) {
3852                         $this->mShowToc = true;
3853                         $enoughToc = true;
3854                 }
3855
3856                 # We need this to perform operations on the HTML
3857                 $sk = $this->mOptions->getSkin();
3858
3859                 # headline counter
3860                 $headlineCount = 0;
3861                 $numVisible = 0;
3862
3863                 # Ugh .. the TOC should have neat indentation levels which can be
3864                 # passed to the skin functions. These are determined here
3865                 $toc = '';
3866                 $full = '';
3867                 $head = array();
3868                 $sublevelCount = array();
3869                 $levelCount = array();
3870                 $toclevel = 0;
3871                 $level = 0;
3872                 $prevlevel = 0;
3873                 $toclevel = 0;
3874                 $prevtoclevel = 0;
3875                 $markerRegex = "{$this->mUniqPrefix}-h-(\d+)-{$this->mMarkerSuffix}";
3876                 $baseTitleText = $this->mTitle->getPrefixedDBkey();
3877                 $tocraw = array();
3878
3879                 foreach( $matches[3] as $headline ) {
3880                         $isTemplate = false;
3881                         $titleText = false;
3882                         $sectionIndex = false;
3883                         $numbering = '';
3884                         $markerMatches = array();
3885                         if (preg_match("/^$markerRegex/", $headline, $markerMatches)) {
3886                                 $serial = $markerMatches[1];
3887                                 list( $titleText, $sectionIndex ) = $this->mHeadings[$serial];
3888                                 $isTemplate = ($titleText != $baseTitleText);
3889                                 $headline = preg_replace("/^$markerRegex/", "", $headline);
3890                         }
3891
3892                         if( $toclevel ) {
3893                                 $prevlevel = $level;
3894                                 $prevtoclevel = $toclevel;
3895                         }
3896                         $level = $matches[1][$headlineCount];
3897
3898                         if( $doNumberHeadings || $enoughToc ) {
3899
3900                                 if ( $level > $prevlevel ) {
3901                                         # Increase TOC level
3902                                         $toclevel++;
3903                                         $sublevelCount[$toclevel] = 0;
3904                                         if( $toclevel<$wgMaxTocLevel ) {
3905                                                 $prevtoclevel = $toclevel;
3906                                                 $toc .= $sk->tocIndent();
3907                                                 $numVisible++;
3908                                         }
3909                                 }
3910                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3911                                         # Decrease TOC level, find level to jump to
3912
3913                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3914                                                 # Can only go down to level 1
3915                                                 $toclevel = 1;
3916                                         } else {
3917                                                 for ($i = $toclevel; $i > 0; $i--) {
3918                                                         if ( $levelCount[$i] == $level ) {
3919                                                                 # Found last matching level
3920                                                                 $toclevel = $i;
3921                                                                 break;
3922                                                         }
3923                                                         elseif ( $levelCount[$i] < $level ) {
3924                                                                 # Found first matching level below current level
3925                                                                 $toclevel = $i + 1;
3926                                                                 break;
3927                                                         }
3928                                                 }
3929                                         }
3930                                         if( $toclevel<$wgMaxTocLevel ) {
3931                                                 if($prevtoclevel < $wgMaxTocLevel) {
3932                                                         # Unindent only if the previous toc level was shown :p
3933                                                         $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3934                                                 } else {
3935                                                         $toc .= $sk->tocLineEnd();
3936                                                 }
3937                                         }
3938                                 }
3939                                 else {
3940                                         # No change in level, end TOC line
3941                                         if( $toclevel<$wgMaxTocLevel ) {
3942                                                 $toc .= $sk->tocLineEnd();
3943                                         }
3944                                 }
3945
3946                                 $levelCount[$toclevel] = $level;
3947
3948                                 # count number of headlines for each level
3949                                 @$sublevelCount[$toclevel]++;
3950                                 $dot = 0;
3951                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3952                                         if( !empty( $sublevelCount[$i] ) ) {
3953                                                 if( $dot ) {
3954                                                         $numbering .= '.';
3955                                                 }
3956                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3957                                                 $dot = 1;
3958                                         }
3959                                 }
3960                         }
3961
3962                         # The safe header is a version of the header text safe to use for links
3963                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3964                         $safeHeadline = $this->mStripState->unstripBoth( $headline );
3965
3966                         # Remove link placeholders by the link text.
3967                         #     <!--LINK number-->
3968                         # turns into
3969                         #     link text with suffix
3970                         $safeHeadline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3971                                                             "\$this->mLinkHolders['texts'][\$1]",
3972                                                             $safeHeadline );
3973                         $safeHeadline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3974                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3975                                                             $safeHeadline );
3976
3977                         # Strip out HTML (other than plain <sup> and <sub>: bug 8393)
3978                         $tocline = preg_replace(
3979                                 array( '#<(?!/?(sup|sub)).*?'.'>#', '#<(/?(sup|sub)).*?'.'>#' ),
3980                                 array( '',                          '<$1>'),
3981                                 $safeHeadline
3982                         );
3983                         $tocline = trim( $tocline );
3984
3985                         # For the anchor, strip out HTML-y stuff period
3986                         $safeHeadline = preg_replace( '/<.*?'.'>/', '', $safeHeadline );
3987                         $safeHeadline = trim( $safeHeadline );
3988
3989                         # Save headline for section edit hint before it's escaped
3990                         $headlineHint = $safeHeadline;
3991                         $safeHeadline = Sanitizer::escapeId( $safeHeadline );
3992                         $refers[$headlineCount] = $safeHeadline;
3993
3994                         # count how many in assoc. array so we can track dupes in anchors
3995                         isset( $refers[$safeHeadline] ) ? $refers[$safeHeadline]++ : $refers[$safeHeadline] = 1;
3996                         $refcount[$headlineCount] = $refers[$safeHeadline];
3997
3998                         # Don't number the heading if it is the only one (looks silly)
3999                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
4000                                 # the two are different if the line contains a link
4001                                 $headline=$numbering . ' ' . $headline;
4002                         }
4003
4004                         # Create the anchor for linking from the TOC to the section
4005                         $anchor = $safeHeadline;
4006                         if($refcount[$headlineCount] > 1 ) {
4007                                 $anchor .= '_' . $refcount[$headlineCount];
4008                         }
4009                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
4010                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
4011                                 $tocraw[] = array( 'toclevel' => $toclevel, 'level' => $level, 'line' => $tocline, 'number' => $numbering );
4012                         }
4013                         # give headline the correct <h#> tag
4014                         if( $showEditLink && $sectionIndex !== false ) {
4015                                 if( $isTemplate ) {
4016                                         # Put a T flag in the section identifier, to indicate to extractSections()
4017                                         # that sections inside <includeonly> should be counted.
4018                                         $editlink = $sk->editSectionLinkForOther($titleText, "T-$sectionIndex");
4019                                 } else {
4020                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionIndex, $headlineHint);
4021                                 }
4022                         } else {
4023                                 $editlink = '';
4024                         }
4025                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
4026
4027                         $headlineCount++;
4028                 }
4029
4030                 $this->mOutput->setSections( $tocraw );
4031
4032                 # Never ever show TOC if no headers
4033                 if( $numVisible < 1 ) {
4034                         $enoughToc = false;
4035                 }
4036
4037                 if( $enoughToc ) {
4038                         if( $prevtoclevel > 0 && $prevtoclevel < $wgMaxTocLevel ) {
4039                                 $toc .= $sk->tocUnindent( $prevtoclevel - 1 );
4040                         }
4041                         $toc = $sk->tocList( $toc );
4042                 }
4043
4044                 # split up and insert constructed headlines
4045
4046                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
4047                 $i = 0;
4048
4049                 foreach( $blocks as $block ) {
4050                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
4051                                 # This is the [edit] link that appears for the top block of text when
4052                                 # section editing is enabled
4053
4054                                 # Disabled because it broke block formatting
4055                                 # For example, a bullet point in the top line
4056                                 # $full .= $sk->editSectionLink(0);
4057                         }
4058                         $full .= $block;
4059                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
4060                                 # Top anchor now in skin
4061                                 $full = $full.$toc;
4062                         }
4063
4064                         if( !empty( $head[$i] ) ) {
4065                                 $full .= $head[$i];
4066                         }
4067                         $i++;
4068                 }
4069                 if( $this->mForceTocPosition ) {
4070                         return str_replace( '<!--MWTOC-->', $toc, $full );
4071                 } else {
4072                         return $full;
4073                 }
4074         }
4075
4076         /**
4077          * Transform wiki markup when saving a page by doing \r\n -> \n
4078          * conversion, substitting signatures, {{subst:}} templates, etc.
4079          *
4080          * @param string $text the text to transform
4081          * @param Title &$title the Title object for the current article
4082          * @param User &$user the User object describing the current user
4083          * @param ParserOptions $options parsing options
4084          * @param bool $clearState whether to clear the parser state first
4085          * @return string the altered wiki markup
4086          * @public
4087          */
4088         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
4089                 $this->mOptions = $options;
4090                 $this->setTitle( $title );
4091                 $this->setOutputType( OT_WIKI );
4092
4093                 if ( $clearState ) {
4094                         $this->clearState();
4095                 }
4096
4097                 $pairs = array(
4098                         "\r\n" => "\n",
4099                 );
4100                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
4101                 $text = $this->pstPass2( $text, $user );
4102                 $text = $this->mStripState->unstripBoth( $text );
4103                 return $text;
4104         }
4105
4106         /**
4107          * Pre-save transform helper function
4108          * @private
4109          */
4110         function pstPass2( $text, $user ) {
4111                 global $wgContLang, $wgLocaltimezone;
4112
4113                 /* Note: This is the timestamp saved as hardcoded wikitext to
4114                  * the database, we use $wgContLang here in order to give
4115                  * everyone the same signature and use the default one rather
4116                  * than the one selected in each user's preferences.
4117                  */
4118                 if ( isset( $wgLocaltimezone ) ) {
4119                         $oldtz = getenv( 'TZ' );
4120                         putenv( 'TZ='.$wgLocaltimezone );
4121                 }
4122                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
4123                   ' (' . date( 'T' ) . ')';
4124                 if ( isset( $wgLocaltimezone ) ) {
4125                         putenv( 'TZ='.$oldtz );
4126                 }
4127
4128                 # Variable replacement
4129                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
4130                 $text = $this->replaceVariables( $text );
4131
4132                 # Strip out <nowiki> etc. added via replaceVariables
4133                 #$text = $this->strip( $text, $this->mStripState, false, array( 'gallery' ) );
4134
4135                 # Signatures
4136                 $sigText = $this->getUserSig( $user );
4137                 $text = strtr( $text, array(
4138                         '~~~~~' => $d,
4139                         '~~~~' => "$sigText $d",
4140                         '~~~' => $sigText
4141                 ) );
4142
4143                 # Context links: [[|name]] and [[name (context)|]]
4144                 #
4145                 global $wgLegalTitleChars;
4146                 $tc = "[$wgLegalTitleChars]";
4147                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
4148
4149                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
4150                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
4151                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
4152
4153                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
4154                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
4155                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
4156
4157                 $t = $this->mTitle->getText();
4158                 $m = array();
4159                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
4160                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4161                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
4162                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
4163                 } else {
4164                         # if there's no context, don't bother duplicating the title
4165                         $text = preg_replace( $p2, '[[\\1]]', $text );
4166                 }
4167
4168                 # Trim trailing whitespace
4169                 $text = rtrim( $text );
4170
4171                 return $text;
4172         }
4173
4174         /**
4175          * Fetch the user's signature text, if any, and normalize to
4176          * validated, ready-to-insert wikitext.
4177          *
4178          * @param User $user
4179          * @return string
4180          * @private
4181          */
4182         function getUserSig( &$user ) {
4183                 global $wgMaxSigChars;
4184
4185                 $username = $user->getName();
4186                 $nickname = $user->getOption( 'nickname' );
4187                 $nickname = $nickname === '' ? $username : $nickname;
4188
4189                 if( mb_strlen( $nickname ) > $wgMaxSigChars ) {
4190                         $nickname = $username;
4191                         wfDebug( __METHOD__ . ": $username has overlong signature.\n" );
4192                 } elseif( $user->getBoolOption( 'fancysig' ) !== false ) {
4193                         # Sig. might contain markup; validate this
4194                         if( $this->validateSig( $nickname ) !== false ) {
4195                                 # Validated; clean up (if needed) and return it
4196                                 return $this->cleanSig( $nickname, true );
4197                         } else {
4198                                 # Failed to validate; fall back to the default
4199                                 $nickname = $username;
4200                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
4201                         }
4202                 }
4203
4204                 // Make sure nickname doesnt get a sig in a sig
4205                 $nickname = $this->cleanSigInSig( $nickname );
4206
4207                 # If we're still here, make it a link to the user page
4208                 $userText = wfEscapeWikiText( $username );
4209                 $nickText = wfEscapeWikiText( $nickname );
4210                 if ( $user->isAnon() )  {
4211                         return wfMsgExt( 'signature-anon', array( 'content', 'parsemag' ), $userText, $nickText );
4212                 } else {
4213                         return wfMsgExt( 'signature', array( 'content', 'parsemag' ), $userText, $nickText );
4214                 }
4215         }
4216
4217         /**
4218          * Check that the user's signature contains no bad XML
4219          *
4220          * @param string $text
4221          * @return mixed An expanded string, or false if invalid.
4222          */
4223         function validateSig( $text ) {
4224                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
4225         }
4226
4227         /**
4228          * Clean up signature text
4229          *
4230          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
4231          * 2) Substitute all transclusions
4232          *
4233          * @param string $text
4234          * @param $parsing Whether we're cleaning (preferences save) or parsing
4235          * @return string Signature text
4236          */
4237         function cleanSig( $text, $parsing = false ) {
4238                 if ( !$parsing ) {
4239                         global $wgTitle;
4240                         $this->clearState();
4241                         $this->setTitle( $wgTitle );
4242                         $this->mOptions = new ParserOptions;
4243                         $this->setOutputType = OT_PREPROCESS;
4244                 }
4245
4246                 # FIXME: regex doesn't respect extension tags or nowiki
4247                 #  => Move this logic to braceSubstitution()
4248                 $substWord = MagicWord::get( 'subst' );
4249                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
4250                 $substText = '{{' . $substWord->getSynonym( 0 );
4251
4252                 $text = preg_replace( $substRegex, $substText, $text );
4253                 $text = $this->cleanSigInSig( $text );
4254                 $dom = $this->preprocessToDom( $text );
4255                 $frame = new PPFrame( $this );
4256                 $text = $frame->expand( $dom->documentElement );
4257
4258                 if ( !$parsing ) {
4259                         $text = $this->mStripState->unstripBoth( $text );
4260                 }
4261
4262                 return $text;
4263         }
4264
4265         /**
4266          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
4267          * @param string $text
4268          * @return string Signature text with /~{3,5}/ removed
4269          */
4270         function cleanSigInSig( $text ) {
4271                 $text = preg_replace( '/~{3,5}/', '', $text );
4272                 return $text;
4273         }
4274
4275         /**
4276          * Set up some variables which are usually set up in parse()
4277          * so that an external function can call some class members with confidence
4278          * @public
4279          */
4280         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
4281                 $this->setTitle( $title );
4282                 $this->mOptions = $options;
4283                 $this->setOutputType( $outputType );
4284                 if ( $clearState ) {
4285                         $this->clearState();
4286                 }
4287         }
4288
4289         /**
4290          * Wrapper for preprocess()
4291          *
4292          * @param string $text the text to preprocess
4293          * @param ParserOptions $options  options
4294          * @return string
4295          * @public
4296          */
4297         function transformMsg( $text, $options ) {
4298                 global $wgTitle;
4299                 static $executing = false;
4300
4301                 $fname = "Parser::transformMsg";
4302
4303                 # Guard against infinite recursion
4304                 if ( $executing ) {
4305                         return $text;
4306                 }
4307                 $executing = true;
4308
4309                 wfProfileIn($fname);
4310                 $text = $this->preprocess( $text, $wgTitle, $options );
4311
4312                 $executing = false;
4313                 wfProfileOut($fname);
4314                 return $text;
4315         }
4316
4317         /**
4318          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
4319          * The callback should have the following form:
4320          *    function myParserHook( $text, $params, &$parser ) { ... }
4321          *
4322          * Transform and return $text. Use $parser for any required context, e.g. use
4323          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
4324          *
4325          * @public
4326          *
4327          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
4328          * @param mixed $callback The callback function (and object) to use for the tag
4329          *
4330          * @return The old value of the mTagHooks array associated with the hook
4331          */
4332         function setHook( $tag, $callback ) {
4333                 $tag = strtolower( $tag );
4334                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
4335                 $this->mTagHooks[$tag] = $callback;
4336                 $this->mStripList[] = $tag;
4337
4338                 return $oldVal;
4339         }
4340
4341         function setTransparentTagHook( $tag, $callback ) {
4342                 $tag = strtolower( $tag );
4343                 $oldVal = isset( $this->mTransparentTagHooks[$tag] ) ? $this->mTransparentTagHooks[$tag] : null;
4344                 $this->mTransparentTagHooks[$tag] = $callback;
4345
4346                 return $oldVal;
4347         }
4348
4349         /**
4350          * Create a function, e.g. {{sum:1|2|3}}
4351          * The callback function should have the form:
4352          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
4353          *
4354          * The callback may either return the text result of the function, or an array with the text
4355          * in element 0, and a number of flags in the other elements. The names of the flags are
4356          * specified in the keys. Valid flags are:
4357          *   found                     The text returned is valid, stop processing the template. This
4358          *                             is on by default.
4359          *   nowiki                    Wiki markup in the return value should be escaped
4360          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
4361          *
4362          * @public
4363          *
4364          * @param string $id The magic word ID
4365          * @param mixed $callback The callback function (and object) to use
4366          * @param integer $flags a combination of the following flags:
4367          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
4368          *
4369          * @return The old callback function for this name, if any
4370          */
4371         function setFunctionHook( $id, $callback, $flags = 0 ) {
4372                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id][0] : null;
4373                 $this->mFunctionHooks[$id] = array( $callback, $flags );
4374
4375                 # Add to function cache
4376                 $mw = MagicWord::get( $id );
4377                 if( !$mw )
4378                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
4379
4380                 $synonyms = $mw->getSynonyms();
4381                 $sensitive = intval( $mw->isCaseSensitive() );
4382
4383                 foreach ( $synonyms as $syn ) {
4384                         # Case
4385                         if ( !$sensitive ) {
4386                                 $syn = strtolower( $syn );
4387                         }
4388                         # Add leading hash
4389                         if ( !( $flags & SFH_NO_HASH ) ) {
4390                                 $syn = '#' . $syn;
4391                         }
4392                         # Remove trailing colon
4393                         if ( substr( $syn, -1, 1 ) == ':' ) {
4394                                 $syn = substr( $syn, 0, -1 );
4395                         }
4396                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
4397                 }
4398                 return $oldVal;
4399         }
4400
4401         /**
4402          * Get all registered function hook identifiers
4403          *
4404          * @return array
4405          */
4406         function getFunctionHooks() {
4407                 return array_keys( $this->mFunctionHooks );
4408         }
4409
4410         /**
4411          * Replace <!--LINK--> link placeholders with actual links, in the buffer
4412          * Placeholders created in Skin::makeLinkObj()
4413          * Returns an array of link CSS classes, indexed by PDBK.
4414          * $options is a bit field, RLH_FOR_UPDATE to select for update
4415          */
4416         function replaceLinkHolders( &$text, $options = 0 ) {
4417                 global $wgUser;
4418                 global $wgContLang;
4419
4420                 $fname = 'Parser::replaceLinkHolders';
4421                 wfProfileIn( $fname );
4422
4423                 $pdbks = array();
4424                 $colours = array();
4425                 $linkcolour_ids = array();
4426                 $sk = $this->mOptions->getSkin();
4427                 $linkCache =& LinkCache::singleton();
4428
4429                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
4430                         wfProfileIn( $fname.'-check' );
4431                         $dbr = wfGetDB( DB_SLAVE );
4432                         $page = $dbr->tableName( 'page' );
4433                         $threshold = $wgUser->getOption('stubthreshold');
4434
4435                         # Sort by namespace
4436                         asort( $this->mLinkHolders['namespaces'] );
4437
4438                         # Generate query
4439                         $query = false;
4440                         $current = null;
4441                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4442                                 # Make title object
4443                                 $title = $this->mLinkHolders['titles'][$key];
4444
4445                                 # Skip invalid entries.
4446                                 # Result will be ugly, but prevents crash.
4447                                 if ( is_null( $title ) ) {
4448                                         continue;
4449                                 }
4450                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4451
4452                                 # Check if it's a static known link, e.g. interwiki
4453                                 if ( $title->isAlwaysKnown() ) {
4454                                         $colours[$pdbk] = '';
4455                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4456                                         $colours[$pdbk] = '';
4457                                         $this->mOutput->addLink( $title, $id );
4458                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4459                                         $colours[$pdbk] = 'new';
4460                                 } elseif ( $title->getNamespace() == NS_SPECIAL && !SpecialPage::exists( $pdbk ) ) {
4461                                         $colours[$pdbk] = 'new';
4462                                 } else {
4463                                         # Not in the link cache, add it to the query
4464                                         if ( !isset( $current ) ) {
4465                                                 $current = $ns;
4466                                                 $query =  "SELECT page_id, page_namespace, page_title";
4467                                                 if ( $threshold > 0 ) {
4468                                                         $query .= ', page_len, page_is_redirect';
4469                                                 }
4470                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4471                                         } elseif ( $current != $ns ) {
4472                                                 $current = $ns;
4473                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4474                                         } else {
4475                                                 $query .= ', ';
4476                                         }
4477
4478                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4479                                 }
4480                         }
4481                         if ( $query ) {
4482                                 $query .= '))';
4483                                 if ( $options & RLH_FOR_UPDATE ) {
4484                                         $query .= ' FOR UPDATE';
4485                                 }
4486
4487                                 $res = $dbr->query( $query, $fname );
4488
4489                                 # Fetch data and form into an associative array
4490                                 # non-existent = broken
4491                                 while ( $s = $dbr->fetchObject($res) ) {
4492                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4493                                         $pdbk = $title->getPrefixedDBkey();
4494                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4495                                         $this->mOutput->addLink( $title, $s->page_id );
4496                                         $colours[$pdbk] = $sk->getLinkColour( $s, $threshold );
4497                                         //add id to the extension todolist
4498                                         $linkcolour_ids[$s->page_id] = $pdbk;
4499                                 }
4500                                 //pass an array of page_ids to an extension
4501                                 wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4502                         }
4503                         wfProfileOut( $fname.'-check' );
4504
4505                         # Do a second query for different language variants of links and categories
4506                         if($wgContLang->hasVariants()){
4507                                 $linkBatch = new LinkBatch();
4508                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4509                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4510                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4511
4512                                 $categories = $this->mOutput->getCategoryLinks();
4513
4514                                 // Add variants of links to link batch
4515                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4516                                         $title = $this->mLinkHolders['titles'][$key];
4517                                         if ( is_null( $title ) )
4518                                                 continue;
4519
4520                                         $pdbk = $title->getPrefixedDBkey();
4521                                         $titleText = $title->getText();
4522
4523                                         // generate all variants of the link title text
4524                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4525
4526                                         // if link was not found (in first query), add all variants to query
4527                                         if ( !isset($colours[$pdbk]) ){
4528                                                 foreach($allTextVariants as $textVariant){
4529                                                         if($textVariant != $titleText){
4530                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4531                                                                 if(is_null($variantTitle)) continue;
4532                                                                 $linkBatch->addObj( $variantTitle );
4533                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4534                                                         }
4535                                                 }
4536                                         }
4537                                 }
4538
4539                                 // process categories, check if a category exists in some variant
4540                                 foreach( $categories as $category ){
4541                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4542                                         foreach($variants as $variant){
4543                                                 if($variant != $category){
4544                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4545                                                         if(is_null($variantTitle)) continue;
4546                                                         $linkBatch->addObj( $variantTitle );
4547                                                         $categoryMap[$variant] = $category;
4548                                                 }
4549                                         }
4550                                 }
4551
4552
4553                                 if(!$linkBatch->isEmpty()){
4554                                         // construct query
4555                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4556
4557                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4558                                         if ( $threshold > 0 ) {
4559                                                 $variantQuery .= ', page_len, page_is_redirect';
4560                                         }
4561
4562                                         $variantQuery .= " FROM $page WHERE $titleClause";
4563                                         if ( $options & RLH_FOR_UPDATE ) {
4564                                                 $variantQuery .= ' FOR UPDATE';
4565                                         }
4566
4567                                         $varRes = $dbr->query( $variantQuery, $fname );
4568
4569                                         // for each found variants, figure out link holders and replace
4570                                         while ( $s = $dbr->fetchObject($varRes) ) {
4571
4572                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4573                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4574                                                 $vardbk = $variantTitle->getDBkey();
4575
4576                                                 $holderKeys = array();
4577                                                 if(isset($variantMap[$varPdbk])){
4578                                                         $holderKeys = $variantMap[$varPdbk];
4579                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4580                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4581                                                 }
4582
4583                                                 // loop over link holders
4584                                                 foreach($holderKeys as $key){
4585                                                         $title = $this->mLinkHolders['titles'][$key];
4586                                                         if ( is_null( $title ) ) continue;
4587
4588                                                         $pdbk = $title->getPrefixedDBkey();
4589
4590                                                         if(!isset($colours[$pdbk])){
4591                                                                 // found link in some of the variants, replace the link holder data
4592                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4593                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4594
4595                                                                 // set pdbk and colour
4596                                                                 $pdbks[$key] = $varPdbk;
4597                                                                 $colours[$varPdbk] = $sk->getLinkColour( $s, $threshold );
4598                                                                 $linkcolour_ids[$s->page_id] = $pdbk;
4599                                                         }
4600                                                         wfRunHooks( 'GetLinkColours', array( $linkcolour_ids, &$colours ) );
4601                                                 }
4602
4603                                                 // check if the object is a variant of a category
4604                                                 if(isset($categoryMap[$vardbk])){
4605                                                         $oldkey = $categoryMap[$vardbk];
4606                                                         if($oldkey != $vardbk)
4607                                                                 $varCategories[$oldkey]=$vardbk;
4608                                                 }
4609                                         }
4610
4611                                         // rebuild the categories in original order (if there are replacements)
4612                                         if(count($varCategories)>0){
4613                                                 $newCats = array();
4614                                                 $originalCats = $this->mOutput->getCategories();
4615                                                 foreach($originalCats as $cat => $sortkey){
4616                                                         // make the replacement
4617                                                         if( array_key_exists($cat,$varCategories) )
4618                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4619                                                         else $newCats[$cat] = $sortkey;
4620                                                 }
4621                                                 $this->mOutput->setCategoryLinks($newCats);
4622                                         }
4623                                 }
4624                         }
4625
4626                         # Construct search and replace arrays
4627                         wfProfileIn( $fname.'-construct' );
4628                         $replacePairs = array();
4629                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4630                                 $pdbk = $pdbks[$key];
4631                                 $searchkey = "<!--LINK $key-->";
4632                                 $title = $this->mLinkHolders['titles'][$key];
4633                                 if ( !isset( $colours[$pdbk] ) || $colours[$pdbk] == 'new' ) {
4634                                         $linkCache->addBadLinkObj( $title );
4635                                         $colours[$pdbk] = 'new';
4636                                         $this->mOutput->addLink( $title, 0 );
4637                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4638                                                                         $this->mLinkHolders['texts'][$key],
4639                                                                         $this->mLinkHolders['queries'][$key] );
4640                                 } else {
4641                                         $replacePairs[$searchkey] = $sk->makeColouredLinkObj( $title, $colours[$pdbk],
4642                                                                         $this->mLinkHolders['texts'][$key],
4643                                                                         $this->mLinkHolders['queries'][$key] );
4644                                 }
4645                         }
4646                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4647                         wfProfileOut( $fname.'-construct' );
4648
4649                         # Do the thing
4650                         wfProfileIn( $fname.'-replace' );
4651                         $text = preg_replace_callback(
4652                                 '/(<!--LINK .*?-->)/',
4653                                 $replacer->cb(),
4654                                 $text);
4655
4656                         wfProfileOut( $fname.'-replace' );
4657                 }
4658
4659                 # Now process interwiki link holders
4660                 # This is quite a bit simpler than internal links
4661                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4662                         wfProfileIn( $fname.'-interwiki' );
4663                         # Make interwiki link HTML
4664                         $replacePairs = array();
4665                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4666                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4667                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4668                         }
4669                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4670
4671                         $text = preg_replace_callback(
4672                                 '/<!--IWLINK (.*?)-->/',
4673                                 $replacer->cb(),
4674                                 $text );
4675                         wfProfileOut( $fname.'-interwiki' );
4676                 }
4677
4678                 wfProfileOut( $fname );
4679                 return $colours;
4680         }
4681
4682         /**
4683          * Replace <!--LINK--> link placeholders with plain text of links
4684          * (not HTML-formatted).
4685          * @param string $text
4686          * @return string
4687          */
4688         function replaceLinkHoldersText( $text ) {
4689                 $fname = 'Parser::replaceLinkHoldersText';
4690                 wfProfileIn( $fname );
4691
4692                 $text = preg_replace_callback(
4693                         '/<!--(LINK|IWLINK) (.*?)-->/',
4694                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4695                         $text );
4696
4697                 wfProfileOut( $fname );
4698                 return $text;
4699         }
4700
4701         /**
4702          * @param array $matches
4703          * @return string
4704          * @private
4705          */
4706         function replaceLinkHoldersTextCallback( $matches ) {
4707                 $type = $matches[1];
4708                 $key  = $matches[2];
4709                 if( $type == 'LINK' ) {
4710                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4711                                 return $this->mLinkHolders['texts'][$key];
4712                         }
4713                 } elseif( $type == 'IWLINK' ) {
4714                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4715                                 return $this->mInterwikiLinkHolders['texts'][$key];
4716                         }
4717                 }
4718                 return $matches[0];
4719         }
4720
4721         /**
4722          * Tag hook handler for 'pre'.
4723          */
4724         function renderPreTag( $text, $attribs ) {
4725                 // Backwards-compatibility hack
4726                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4727
4728                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4729                 return wfOpenElement( 'pre', $attribs ) .
4730                         Xml::escapeTagsOnly( $content ) .
4731                         '</pre>';
4732         }
4733
4734         /**
4735          * Renders an image gallery from a text with one line per image.
4736          * text labels may be given by using |-style alternative text. E.g.
4737          *   Image:one.jpg|The number "1"
4738          *   Image:tree.jpg|A tree
4739          * given as text will return the HTML of a gallery with two images,
4740          * labeled 'The number "1"' and
4741          * 'A tree'.
4742          */
4743         function renderImageGallery( $text, $params ) {
4744                 $ig = new ImageGallery();
4745                 $ig->setContextTitle( $this->mTitle );
4746                 $ig->setShowBytes( false );
4747                 $ig->setShowFilename( false );
4748                 $ig->setParser( $this );
4749                 $ig->setHideBadImages();
4750                 $ig->setAttributes( Sanitizer::validateTagAttributes( $params, 'table' ) );
4751                 $ig->useSkin( $this->mOptions->getSkin() );
4752                 $ig->mRevisionId = $this->mRevisionId;
4753
4754                 if( isset( $params['caption'] ) ) {
4755                         $caption = $params['caption'];
4756                         $caption = htmlspecialchars( $caption );
4757                         $caption = $this->replaceInternalLinks( $caption );
4758                         $ig->setCaptionHtml( $caption );
4759                 }
4760                 if( isset( $params['perrow'] ) ) {
4761                         $ig->setPerRow( $params['perrow'] );
4762                 }
4763                 if( isset( $params['widths'] ) ) {
4764                         $ig->setWidths( $params['widths'] );
4765                 }
4766                 if( isset( $params['heights'] ) ) {
4767                         $ig->setHeights( $params['heights'] );
4768                 }
4769
4770                 wfRunHooks( 'BeforeParserrenderImageGallery', array( &$this, &$ig ) );
4771
4772                 $lines = explode( "\n", $text );
4773                 foreach ( $lines as $line ) {
4774                         # match lines like these:
4775                         # Image:someimage.jpg|This is some image
4776                         $matches = array();
4777                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4778                         # Skip empty lines
4779                         if ( count( $matches ) == 0 ) {
4780                                 continue;
4781                         }
4782                         $tp = Title::newFromText( $matches[1] );
4783                         $nt =& $tp;
4784                         if( is_null( $nt ) ) {
4785                                 # Bogus title. Ignore these so we don't bomb out later.
4786                                 continue;
4787                         }
4788                         if ( isset( $matches[3] ) ) {
4789                                 $label = $matches[3];
4790                         } else {
4791                                 $label = '';
4792                         }
4793
4794                         $html = $this->recursiveTagParse( trim( $label ) );
4795
4796                         $ig->add( $nt, $html );
4797
4798                         # Only add real images (bug #5586)
4799                         if ( $nt->getNamespace() == NS_IMAGE ) {
4800                                 $this->mOutput->addImage( $nt->getDBkey() );
4801                         }
4802                 }
4803                 return $ig->toHTML();
4804         }
4805
4806         function getImageParams( $handler ) {
4807                 if ( $handler ) {
4808                         $handlerClass = get_class( $handler );
4809                 } else {
4810                         $handlerClass = '';
4811                 }
4812                 if ( !isset( $this->mImageParams[$handlerClass]  ) ) {
4813                         // Initialise static lists
4814                         static $internalParamNames = array(
4815                                 'horizAlign' => array( 'left', 'right', 'center', 'none' ),
4816                                 'vertAlign' => array( 'baseline', 'sub', 'super', 'top', 'text-top', 'middle',
4817                                         'bottom', 'text-bottom' ),
4818                                 'frame' => array( 'thumbnail', 'manualthumb', 'framed', 'frameless',
4819                                         'upright', 'border' ),
4820                         );
4821                         static $internalParamMap;
4822                         if ( !$internalParamMap ) {
4823                                 $internalParamMap = array();
4824                                 foreach ( $internalParamNames as $type => $names ) {
4825                                         foreach ( $names as $name ) {
4826                                                 $magicName = str_replace( '-', '_', "img_$name" );
4827                                                 $internalParamMap[$magicName] = array( $type, $name );
4828                                         }
4829                                 }
4830                         }
4831
4832                         // Add handler params
4833                         $paramMap = $internalParamMap;
4834                         if ( $handler ) {
4835                                 $handlerParamMap = $handler->getParamMap();
4836                                 foreach ( $handlerParamMap as $magic => $paramName ) {
4837                                         $paramMap[$magic] = array( 'handler', $paramName );
4838                                 }
4839                         }
4840                         $this->mImageParams[$handlerClass] = $paramMap;
4841                         $this->mImageParamsMagicArray[$handlerClass] = new MagicWordArray( array_keys( $paramMap ) );
4842                 }
4843                 return array( $this->mImageParams[$handlerClass], $this->mImageParamsMagicArray[$handlerClass] );
4844         }
4845
4846         /**
4847          * Parse image options text and use it to make an image
4848          */
4849         function makeImage( $title, $options ) {
4850                 # @TODO: let the MediaHandler specify its transform parameters
4851                 #
4852                 # Check if the options text is of the form "options|alt text"
4853                 # Options are:
4854                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4855                 #  * left               no resizing, just left align. label is used for alt= only
4856                 #  * right              same, but right aligned
4857                 #  * none               same, but not aligned
4858                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4859                 #  * center             center the image
4860                 #  * framed             Keep original image size, no magnify-button.
4861                 #  * frameless          like 'thumb' but without a frame. Keeps user preferences for width
4862                 #  * upright            reduce width for upright images, rounded to full __0 px
4863                 #  * border             draw a 1px border around the image
4864                 # vertical-align values (no % or length right now):
4865                 #  * baseline
4866                 #  * sub
4867                 #  * super
4868                 #  * top
4869                 #  * text-top
4870                 #  * middle
4871                 #  * bottom
4872                 #  * text-bottom
4873
4874                 $parts = array_map( 'trim', explode( '|', $options) );
4875                 $sk = $this->mOptions->getSkin();
4876
4877                 # Give extensions a chance to select the file revision for us
4878                 $skip = $time = false;
4879                 wfRunHooks( 'BeforeParserMakeImageLinkObj', array( &$this, &$title, &$skip, &$time ) );
4880
4881                 if ( $skip ) {
4882                         return $sk->makeLinkObj( $title );
4883                 }
4884
4885                 # Get parameter map
4886                 $file = wfFindFile( $title, $time );
4887                 $handler = $file ? $file->getHandler() : false;
4888
4889                 list( $paramMap, $mwArray ) = $this->getImageParams( $handler );
4890
4891                 # Process the input parameters
4892                 $caption = '';
4893                 $params = array( 'frame' => array(), 'handler' => array(),
4894                         'horizAlign' => array(), 'vertAlign' => array() );
4895                 foreach( $parts as $part ) {
4896                         list( $magicName, $value ) = $mwArray->matchVariableStartToEnd( $part );
4897                         if ( isset( $paramMap[$magicName] ) ) {
4898                                 list( $type, $paramName ) = $paramMap[$magicName];
4899                                 $params[$type][$paramName] = $value;
4900
4901                                 // Special case; width and height come in one variable together
4902                                 if( $type == 'handler' && $paramName == 'width' ) {
4903                                         $m = array();
4904                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $value, $m ) ) {
4905                                                 $params[$type]['width'] = intval( $m[1] );
4906                                                 $params[$type]['height'] = intval( $m[2] );
4907                                         } else {
4908                                                 $params[$type]['width'] = intval( $value );
4909                                         }
4910                                 }
4911                         } else {
4912                                 $caption = $part;
4913                         }
4914                 }
4915
4916                 # Process alignment parameters
4917                 if ( $params['horizAlign'] ) {
4918                         $params['frame']['align'] = key( $params['horizAlign'] );
4919                 }
4920                 if ( $params['vertAlign'] ) {
4921                         $params['frame']['valign'] = key( $params['vertAlign'] );
4922                 }
4923
4924                 # Validate the handler parameters
4925                 if ( $handler ) {
4926                         foreach ( $params['handler'] as $name => $value ) {
4927                                 if ( !$handler->validateParam( $name, $value ) ) {
4928                                         unset( $params['handler'][$name] );
4929                                 }
4930                         }
4931                 }
4932
4933                 # Strip bad stuff out of the alt text
4934                 $alt = $this->replaceLinkHoldersText( $caption );
4935
4936                 # make sure there are no placeholders in thumbnail attributes
4937                 # that are later expanded to html- so expand them now and
4938                 # remove the tags
4939                 $alt = $this->mStripState->unstripBoth( $alt );
4940                 $alt = Sanitizer::stripAllTags( $alt );
4941
4942                 $params['frame']['alt'] = $alt;
4943                 $params['frame']['caption'] = $caption;
4944
4945                 # Linker does the rest
4946                 $ret = $sk->makeImageLink2( $title, $file, $params['frame'], $params['handler'] );
4947
4948                 # Give the handler a chance to modify the parser object
4949                 if ( $handler ) {
4950                         $handler->parserTransformHook( $this, $file );
4951                 }
4952
4953                 return $ret;
4954         }
4955
4956         /**
4957          * Set a flag in the output object indicating that the content is dynamic and
4958          * shouldn't be cached.
4959          */
4960         function disableCache() {
4961                 wfDebug( "Parser output marked as uncacheable.\n" );
4962                 $this->mOutput->mCacheTime = -1;
4963         }
4964
4965         /**#@+
4966          * Callback from the Sanitizer for expanding items found in HTML attribute
4967          * values, so they can be safely tested and escaped.
4968          * @param string $text
4969          * @param PPFrame $frame
4970          * @return string
4971          * @private
4972          */
4973         function attributeStripCallback( &$text, $frame = false ) {
4974                 $text = $this->replaceVariables( $text, $frame );
4975                 $text = $this->mStripState->unstripBoth( $text );
4976                 return $text;
4977         }
4978
4979         /**#@-*/
4980
4981         /**#@+
4982          * Accessor/mutator
4983          */
4984         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4985         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4986         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4987         /**#@-*/
4988
4989         /**#@+
4990          * Accessor
4991          */
4992         function getTags() { return array_merge( array_keys($this->mTransparentTagHooks), array_keys( $this->mTagHooks ) ); }
4993         /**#@-*/
4994
4995
4996         /**
4997          * Break wikitext input into sections, and either pull or replace
4998          * some particular section's text.
4999          *
5000          * External callers should use the getSection and replaceSection methods.
5001          *
5002          * @param string $text Page wikitext
5003          * @param string $section A section identifier string of the form:
5004          *   <flag1> - <flag2> - ... - <section number>
5005          *
5006          * Currently the only recognised flag is "T", which means the target section number
5007          * was derived during a template inclusion parse, in other words this is a template
5008          * section edit link. If no flags are given, it was an ordinary section edit link.
5009          * This flag is required to avoid a section numbering mismatch when a section is
5010          * enclosed by <includeonly> (bug 6563).
5011          *
5012          * The section number 0 pulls the text before the first heading; other numbers will
5013          * pull the given section along with its lower-level subsections. If the section is
5014          * not found, $mode=get will return $newtext, and $mode=replace will return $text.
5015          *
5016          * @param string $mode One of "get" or "replace"
5017          * @param string $newText Replacement text for section data.
5018          * @return string for "get", the extracted section text.
5019          *                for "replace", the whole page with the section replaced.
5020          */
5021         private function extractSections( $text, $section, $mode, $newText='' ) {
5022                 global $wgTitle;
5023                 $this->clearState();
5024                 $this->setTitle( $wgTitle ); // not generally used but removes an ugly failure mode
5025                 $this->mOptions = new ParserOptions;
5026                 $this->setOutputType( OT_WIKI );
5027                 $curIndex = 0;
5028                 $outText = '';
5029                 $frame = new PPFrame( $this );
5030
5031                 // Process section extraction flags
5032                 $flags = 0;
5033                 $sectionParts = explode( '-', $section );
5034                 $sectionIndex = array_pop( $sectionParts );
5035                 foreach ( $sectionParts as $part ) {
5036                         if ( $part == 'T' ) {
5037                                 $flags |= self::PTD_FOR_INCLUSION;
5038                         }
5039                 }
5040                 // Preprocess the text
5041                 $dom = $this->preprocessToDom( $text, $flags );
5042                 $root = $dom->documentElement;
5043
5044                 // <h> nodes indicate section breaks
5045                 // They can only occur at the top level, so we can find them by iterating the root's children
5046                 $node = $root->firstChild;
5047
5048                 // Find the target section
5049                 if ( $sectionIndex == 0 ) {
5050                         // Section zero doesn't nest, level=big
5051                         $targetLevel = 1000;
5052                 } else {
5053                         while ( $node ) {
5054                                 if ( $node->nodeName == 'h' ) {
5055                                         if ( $curIndex + 1 == $sectionIndex ) {
5056                                                 break;
5057                                         }
5058                                         $curIndex++;
5059                                 }
5060                                 if ( $mode == 'replace' ) {
5061                                         $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5062                                 }
5063                                 $node = $node->nextSibling;
5064                         }
5065                         if ( $node ) {
5066                                 $targetLevel = $node->getAttribute( 'level' );
5067                         }
5068                 }
5069
5070                 if ( !$node ) {
5071                         // Not found
5072                         if ( $mode == 'get' ) {
5073                                 return $newText;
5074                         } else {
5075                                 return $text;
5076                         }
5077                 }
5078
5079                 // Find the end of the section, including nested sections
5080                 do {
5081                         if ( $node->nodeName == 'h' ) {
5082                                 $curIndex++;
5083                                 $curLevel = $node->getAttribute( 'level' );
5084                                 if ( $curIndex != $sectionIndex && $curLevel <= $targetLevel ) {
5085                                         break;
5086                                 }
5087                         }
5088                         if ( $mode == 'get' ) {
5089                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5090                         }
5091                         $node = $node->nextSibling;
5092                 } while ( $node );
5093
5094                 // Write out the remainder (in replace mode only)
5095                 if ( $mode == 'replace' ) {
5096                         // Output the replacement text
5097                         // Add two newlines on -- trailing whitespace in $newText is conventionally
5098                         // stripped by the editor, so we need both newlines to restore the paragraph gap
5099                         $outText .= $newText . "\n\n";
5100                         while ( $node ) {
5101                                 $outText .= $frame->expand( $node, PPFrame::RECOVER_ORIG );
5102                                 $node = $node->nextSibling;
5103                         }
5104                 }
5105
5106                 if ( is_string( $outText ) ) {
5107                         // Re-insert stripped tags
5108                         $outText = trim( $this->mStripState->unstripBoth( $outText ) );
5109                 }
5110
5111                 return $outText;
5112         }
5113
5114         /**
5115          * This function returns the text of a section, specified by a number ($section).
5116          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
5117          * the first section before any such heading (section 0).
5118          *
5119          * If a section contains subsections, these are also returned.
5120          *
5121          * @param string $text text to look in
5122          * @param string $section section identifier
5123          * @param string $deftext default to return if section is not found
5124          * @return string text of the requested section
5125          */
5126         public function getSection( $text, $section, $deftext='' ) {
5127                 return $this->extractSections( $text, $section, "get", $deftext );
5128         }
5129
5130         public function replaceSection( $oldtext, $section, $text ) {
5131                 return $this->extractSections( $oldtext, $section, "replace", $text );
5132         }
5133
5134         /**
5135          * Get the timestamp associated with the current revision, adjusted for
5136          * the default server-local timestamp
5137          */
5138         function getRevisionTimestamp() {
5139                 if ( is_null( $this->mRevisionTimestamp ) ) {
5140                         wfProfileIn( __METHOD__ );
5141                         global $wgContLang;
5142                         $dbr = wfGetDB( DB_SLAVE );
5143                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
5144                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
5145
5146                         // Normalize timestamp to internal MW format for timezone processing.
5147                         // This has the added side-effect of replacing a null value with
5148                         // the current time, which gives us more sensible behavior for
5149                         // previews.
5150                         $timestamp = wfTimestamp( TS_MW, $timestamp );
5151
5152                         // The cryptic '' timezone parameter tells to use the site-default
5153                         // timezone offset instead of the user settings.
5154                         //
5155                         // Since this value will be saved into the parser cache, served
5156                         // to other users, and potentially even used inside links and such,
5157                         // it needs to be consistent for all visitors.
5158                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
5159
5160                         wfProfileOut( __METHOD__ );
5161                 }
5162                 return $this->mRevisionTimestamp;
5163         }
5164
5165         /**
5166          * Mutator for $mDefaultSort
5167          *
5168          * @param $sort New value
5169          */
5170         public function setDefaultSort( $sort ) {
5171                 $this->mDefaultSort = $sort;
5172         }
5173
5174         /**
5175          * Accessor for $mDefaultSort
5176          * Will use the title/prefixed title if none is set
5177          *
5178          * @return string
5179          */
5180         public function getDefaultSort() {
5181                 if( $this->mDefaultSort !== false ) {
5182                         return $this->mDefaultSort;
5183                 } else {
5184                         return $this->mTitle->getNamespace() == NS_CATEGORY
5185                                         ? $this->mTitle->getText()
5186                                         : $this->mTitle->getPrefixedText();
5187                 }
5188         }
5189
5190         /**
5191          * Try to guess the section anchor name based on a wikitext fragment
5192          * presumably extracted from a heading, for example "Header" from
5193          * "== Header ==".
5194          */
5195         public function guessSectionNameFromWikiText( $text ) {
5196                 # Strip out wikitext links(they break the anchor)
5197                 $text = $this->stripSectionName( $text );
5198                 $headline = Sanitizer::decodeCharReferences( $text );
5199                 # strip out HTML
5200                 $headline = StringUtils::delimiterReplace( '<', '>', '', $headline );
5201                 $headline = trim( $headline );
5202                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
5203                 $replacearray = array(
5204                         '%3A' => ':',
5205                         '%' => '.'
5206                 );
5207                 return str_replace(
5208                         array_keys( $replacearray ),
5209                         array_values( $replacearray ),
5210                         $sectionanchor );
5211         }
5212
5213         /**
5214          * Strips a text string of wikitext for use in a section anchor
5215          *
5216          * Accepts a text string and then removes all wikitext from the
5217          * string and leaves only the resultant text (i.e. the result of
5218          * [[User:WikiSysop|Sysop]] would be "Sysop" and the result of
5219          * [[User:WikiSysop]] would be "User:WikiSysop") - this is intended
5220          * to create valid section anchors by mimicing the output of the
5221          * parser when headings are parsed.
5222          *
5223          * @param $text string Text string to be stripped of wikitext
5224          * for use in a Section anchor
5225          * @return Filtered text string
5226          */
5227         public function stripSectionName( $text ) {
5228                 # Strip internal link markup
5229                 $text = preg_replace('/\[\[:?([^[|]+)\|([^[]+)\]\]/','$2',$text);
5230                 $text = preg_replace('/\[\[:?([^[]+)\|?\]\]/','$1',$text);
5231
5232                 # Strip external link markup (FIXME: Not Tolerant to blank link text
5233                 # I.E. [http://www.mediawiki.org] will render as [1] or something depending
5234                 # on how many empty links there are on the page - need to figure that out.
5235                 $text = preg_replace('/\[(?:' . wfUrlProtocols() . ')([^ ]+?) ([^[]+)\]/','$2',$text);
5236
5237                 # Parse wikitext quotes (italics & bold)
5238                 $text = $this->doQuotes($text);
5239
5240                 # Strip HTML tags
5241                 $text = StringUtils::delimiterReplace( '<', '>', '', $text );
5242                 return $text;
5243         }
5244
5245         /**
5246          * strip/replaceVariables/unstrip for preprocessor regression testing
5247          */
5248         function srvus( $text ) {
5249                 $text = $this->replaceVariables( $text );
5250                 $text = $this->mStripState->unstripBoth( $text );
5251                 $text = Sanitizer::removeHTMLtags( $text );
5252                 return $text;
5253         }
5254 }
5255
5256 /**
5257  * @todo document, briefly.
5258  * @addtogroup Parser
5259  */
5260 class StripState {
5261         var $general, $nowiki;
5262
5263         function __construct() {
5264                 $this->general = new ReplacementArray;
5265                 $this->nowiki = new ReplacementArray;
5266         }
5267
5268         function unstripGeneral( $text ) {
5269                 wfProfileIn( __METHOD__ );
5270                 do {
5271                         $oldText = $text;
5272                         $text = $this->general->replace( $text );
5273                 } while ( $text != $oldText );
5274                 wfProfileOut( __METHOD__ );
5275                 return $text;
5276         }
5277
5278         function unstripNoWiki( $text ) {
5279                 wfProfileIn( __METHOD__ );
5280                 do {
5281                         $oldText = $text;
5282                         $text = $this->nowiki->replace( $text );
5283                 } while ( $text != $oldText );
5284                 wfProfileOut( __METHOD__ );
5285                 return $text;
5286         }
5287
5288         function unstripBoth( $text ) {
5289                 wfProfileIn( __METHOD__ );
5290                 do {
5291                         $oldText = $text;
5292                         $text = $this->general->replace( $text );
5293                         $text = $this->nowiki->replace( $text );
5294                 } while ( $text != $oldText );
5295                 wfProfileOut( __METHOD__ );
5296                 return $text;
5297         }
5298 }
5299
5300 /**
5301  * @todo document, briefly.
5302  * @addtogroup Parser
5303  */
5304 class OnlyIncludeReplacer {
5305         var $output = '';
5306
5307         function replace( $matches ) {
5308                 if ( substr( $matches[1], -1 ) == "\n" ) {
5309                         $this->output .= substr( $matches[1], 0, -1 );
5310                 } else {
5311                         $this->output .= $matches[1];
5312                 }
5313         }
5314 }
5315
5316 /**
5317  * An expansion frame, used as a context to expand the result of preprocessToDom()
5318  */
5319 class PPFrame {
5320         var $parser, $title;
5321         var $titleCache;
5322
5323         /**
5324          * Hashtable listing templates which are disallowed for expansion in this frame,
5325          * having been encountered previously in parent frames.
5326          */
5327         var $loopCheckHash;
5328
5329         /**
5330          * Recursion depth of this frame, top = 0
5331          */
5332         var $depth;
5333
5334         const NO_ARGS = 1;
5335         const NO_TEMPLATES = 2;
5336         const STRIP_COMMENTS = 4;
5337         const NO_IGNORE = 8;
5338
5339         const RECOVER_ORIG = 11;
5340
5341         /**
5342          * Construct a new preprocessor frame.
5343          * @param Parser $parser The parent parser
5344          * @param Title $title The context title, or false if there isn't one
5345          */
5346         function __construct( $parser ) {
5347                 $this->parser = $parser;
5348                 $this->title = $parser->mTitle;
5349                 $this->titleCache = array( $this->title ? $this->title->getPrefixedDBkey() : false );
5350                 $this->loopCheckHash = array();
5351                 $this->depth = 0;
5352         }
5353
5354         /**
5355          * Create a new child frame
5356          * $args is optionally a DOMNodeList containing the template arguments
5357          */
5358         function newChild( $args = false, $title = false ) {
5359                 $namedArgs = array();
5360                 $numberedArgs = array();
5361                 if ( $title === false ) {
5362                         $title = $this->title;
5363                 }
5364                 if ( $args !== false ) {
5365                         $xpath = false;
5366                         foreach ( $args as $arg ) {
5367                                 if ( !$xpath ) {
5368                                         $xpath = new DOMXPath( $arg->ownerDocument );
5369                                 }
5370
5371                                 $nameNodes = $xpath->query( 'name', $arg );
5372                                 $value = $xpath->query( 'value', $arg );
5373                                 if ( $nameNodes->item( 0 )->hasAttributes() ) {
5374                                         // Numbered parameter
5375                                         $index = $nameNodes->item( 0 )->attributes->getNamedItem( 'index' )->textContent;
5376                                         $numberedArgs[$index] = $value->item( 0 );
5377                                         unset( $namedArgs[$index] );
5378                                 } else {
5379                                         // Named parameter
5380                                         $name = trim( $this->expand( $nameNodes->item( 0 ), PPFrame::STRIP_COMMENTS ) );
5381                                         $namedArgs[$name] = $value->item( 0 );
5382                                         unset( $numberedArgs[$name] );
5383                                 }
5384                         }
5385                 }
5386                 return new PPTemplateFrame( $this->parser, $this, $numberedArgs, $namedArgs, $title );
5387         }
5388
5389         /**
5390          * Expand a DOMNode describing a preprocessed document into plain wikitext,
5391          * using the current context
5392          * @param $root the node
5393          */
5394         function expand( $root, $flags = 0 ) {
5395                 if ( is_string( $root ) ) {
5396                         return $root;
5397                 }
5398
5399                 if ( ++$this->parser->mPPNodeCount > $this->parser->mOptions->mMaxPPNodeCount )
5400                 {
5401                         return '<span class="error">Node-count limit exceeded</span>';
5402                 }
5403
5404                 if ( is_array( $root ) || $root instanceof DOMNodeList ) {
5405                         $s = '';
5406                         foreach ( $root as $node ) {
5407                                 $s .= $this->expand( $node, $flags );
5408                         }
5409                 } elseif ( $root instanceof DOMNode ) {
5410                         if ( $root->nodeType == XML_TEXT_NODE ) {
5411                                 $s = $root->nodeValue;
5412                         } elseif ( $root->nodeName == 'template' ) {
5413                                 # Double-brace expansion
5414                                 $xpath = new DOMXPath( $root->ownerDocument );
5415                                 $titles = $xpath->query( 'title', $root );
5416                                 $title = $titles->item( 0 );
5417                                 $parts = $xpath->query( 'part', $root );
5418                                 if ( $flags & self::NO_TEMPLATES ) {
5419                                         $s = '{{' . $this->implodeWithFlags( '|', $flags, $title, $parts ) . '}}';
5420                                 } else {
5421                                         $lineStart = $root->getAttribute( 'lineStart' );
5422                                         $params = array(
5423                                                 'title' => $title,
5424                                                 'parts' => $parts,
5425                                                 'lineStart' => $lineStart,
5426                                                 'text' => 'FIXME' );
5427                                         $s = $this->parser->braceSubstitution( $params, $this );
5428                                 }
5429                         } elseif ( $root->nodeName == 'tplarg' ) {
5430                                 # Triple-brace expansion
5431                                 $xpath = new DOMXPath( $root->ownerDocument );
5432                                 $titles = $xpath->query( 'title', $root );
5433                                 $title = $titles->item( 0 );
5434                                 $parts = $xpath->query( 'part', $root );
5435                                 if ( $flags & self::NO_ARGS ) {
5436                                         $s = '{{{' . $this->implodeWithFlags( '|', $flags, $title, $parts ) . '}}}';
5437                                 } else {
5438                                         $params = array( 'title' => $title, 'parts' => $parts, 'text' => 'FIXME' );
5439                                         $s = $this->parser->argSubstitution( $params, $this );
5440                                 }
5441                         } elseif ( $root->nodeName == 'comment' ) {
5442                                 # HTML-style comment
5443                                 if ( $this->parser->ot['html']
5444                                         || ( $this->parser->ot['pre'] && $this->parser->mOptions->getRemoveComments() )
5445                                         || ( $flags & self::STRIP_COMMENTS ) )
5446                                 {
5447                                         $s = '';
5448                                 } else {
5449                                         $s = $root->textContent;
5450                                 }
5451                         } elseif ( $root->nodeName == 'ignore' ) {
5452                                 # Output suppression used by <includeonly> etc.
5453                                 # OT_WIKI will only respect <ignore> in substed templates.
5454                                 # The other output types respect it unless NO_IGNORE is set.
5455                                 # extractSections() sets NO_IGNORE and so never respects it.
5456                                 if ( ( !isset( $this->parent ) && $this->parser->ot['wiki'] ) || ( $flags & self::NO_IGNORE ) ) {
5457                                         $s = $root->textContent;
5458                                 } else {
5459                                         $s = '';
5460                                 }
5461                         } elseif ( $root->nodeName == 'ext' ) {
5462                                 # Extension tag
5463                                 $xpath = new DOMXPath( $root->ownerDocument );
5464                                 $names = $xpath->query( 'name', $root );
5465                                 $attrs = $xpath->query( 'attr', $root );
5466                                 $inners = $xpath->query( 'inner', $root );
5467                                 $closes = $xpath->query( 'close', $root );
5468                                 $params = array(
5469                                         'name' => $names->item( 0 ),
5470                                         'attr' => $attrs->length > 0 ? $attrs->item( 0 ) : null,
5471                                         'inner' => $inners->length > 0 ? $inners->item( 0 ) : null,
5472                                         'close' => $closes->length > 0 ? $closes->item( 0 ) : null,
5473                                 );
5474                                 $s = $this->parser->extensionSubstitution( $params, $this );
5475                         } elseif ( $root->nodeName == 'h' ) {
5476                                 # Heading
5477                                 $s = $this->expand( $root->childNodes, $flags );
5478
5479                                 if ( $this->parser->ot['html'] ) {
5480                                         # Insert heading index marker
5481                                         $headingIndex = $root->getAttribute( 'i' );
5482                                         $titleText = $this->title->getPrefixedDBkey();
5483                                         $this->parser->mHeadings[] = array( $titleText, $headingIndex );
5484                                         $serial = count( $this->parser->mHeadings ) - 1;
5485                                         $marker = "{$this->parser->mUniqPrefix}-h-$serial-{$this->parser->mMarkerSuffix}";
5486                                         $count = $root->getAttribute( 'level' );
5487                                         $s = substr( $s, 0, $count ) . $marker . substr( $s, $count );
5488                                         $this->parser->mStripState->general->setPair( $marker, '' );
5489                                 }
5490                         } else {
5491                                 # Generic recursive expansion
5492                                 $s = '';
5493                                 for ( $node = $root->firstChild; $node; $node = $node->nextSibling ) {
5494                                         if ( $node->nodeType == XML_TEXT_NODE ) {
5495                                                 $s .= $node->nodeValue;
5496                                         } elseif ( $node->nodeType == XML_ELEMENT_NODE ) {
5497                                                 $s .= $this->expand( $node, $flags );
5498                                         }
5499                                 }
5500                         }
5501                 } else {
5502                         throw new MWException( __METHOD__.': Invalid parameter type' );
5503                 }
5504                 return $s;
5505         }
5506
5507         function implodeWithFlags( $sep, $flags /*, ... */ ) {
5508                 $args = array_slice( func_get_args(), 2 );
5509
5510                 $first = true;
5511                 $s = '';
5512                 foreach ( $args as $root ) {
5513                         if ( !is_array( $root ) && !( $root instanceof DOMNodeList ) ) {
5514                                 $root = array( $root );
5515                         }
5516                         foreach ( $root as $node ) {
5517                                 if ( $first ) {
5518                                         $first = false;
5519                                 } else {
5520                                         $s .= $sep;
5521                                 }
5522                                 $s .= $this->expand( $node, $flags );
5523                         }
5524                 }
5525                 return $s;
5526         }
5527
5528         function implode( $sep /*, ... */ ) {
5529                 $args = func_get_args();
5530                 $args = array_merge( array_slice( $args, 0, 1 ), array( 0 ), array_slice( $args, 1 ) );
5531                 return call_user_func_array( array( $this, 'implodeWithFlags' ), $args );
5532         }
5533
5534         /**
5535          * Split an <arg> or <template> node into a three-element array:
5536          *    DOMNode name, string index and DOMNode value
5537          */
5538         function splitBraceNode( $node ) {
5539                 $xpath = new DOMXPath( $node->ownerDocument );
5540                 $names = $xpath->query( 'name', $node );
5541                 $values = $xpath->query( 'value', $node );
5542                 if ( !$names->length || !$values->length ) {
5543                         throw new MWException( 'Invalid brace node passed to ' . __METHOD__ );
5544                 }
5545                 $name = $names->item( 0 );
5546                 $index = $name->getAttribute( 'index' );
5547                 return array( $name, $index, $values->item( 0 ) );
5548         }
5549
5550         /**
5551          * Split an <ext> node into an associative array containing name, attr, inner and close
5552          * All values in the resulting array are DOMNodes. Inner and close are optional.
5553          */
5554         function splitExtNode( $node ) {
5555                 $xpath = new DOMXPath( $node->ownerDocument );
5556                 $names = $xpath->query( 'name', $node );
5557                 $attrs = $xpath->query( 'attr', $node );
5558                 $inners = $xpath->query( 'inner', $node );
5559                 $closes = $xpath->query( 'close', $node );
5560                 if ( !$names->length || !$attrs->length ) {
5561                         throw new MWException( 'Invalid ext node passed to ' . __METHOD__ );
5562                 }
5563                 $parts = array(
5564                         'name' => $names->item( 0 ),
5565                         'attr' => $attrs->item( 0 ) );
5566                 if ( $inners->length ) {
5567                         $parts['inner'] = $inners->item( 0 );
5568                 }
5569                 if ( $closes->length ) {
5570                         $parts['close'] = $closes->item( 0 );
5571                 }
5572                 return $parts;
5573         }
5574
5575         function __toString() {
5576                 return 'frame{}';
5577         }
5578
5579         function getPDBK( $level = false ) {
5580                 if ( $level === false ) {
5581                         return $this->title->getPrefixedDBkey();
5582                 } else {
5583                         return isset( $this->titleCache[$level] ) ? $this->titleCache[$level] : false;
5584                 }
5585         }
5586
5587         /**
5588          * Returns true if there are no arguments in this frame
5589          */
5590         function isEmpty() {
5591                 return true;
5592         }
5593
5594         function getArgument( $name ) {
5595                 return false;
5596         }
5597
5598         /**
5599          * Returns true if the infinite loop check is OK, false if a loop is detected
5600          */
5601         function loopCheck( $title ) {
5602                 return !isset( $this->loopCheckHash[$title->getPrefixedDBkey()] );
5603         }
5604 }
5605
5606 /**
5607  * Expansion frame with template arguments
5608  */
5609 class PPTemplateFrame extends PPFrame {
5610         var $numberedArgs, $namedArgs, $parent;
5611         var $numberedExpansionCache, $namedExpansionCache;
5612
5613         function __construct( $parser, $parent = false, $numberedArgs = array(), $namedArgs = array(), $title = false ) {
5614                 $this->parser = $parser;
5615                 $this->parent = $parent;
5616                 $this->numberedArgs = $numberedArgs;
5617                 $this->namedArgs = $namedArgs;
5618                 $this->title = $title;
5619                 $pdbk = $title ? $title->getPrefixedDBkey() : false;
5620                 $this->titleCache = $parent->titleCache;
5621                 $this->titleCache[] = $pdbk;
5622                 $this->loopCheckHash = /*clone*/ $parent->loopCheckHash;
5623                 if ( $pdbk !== false ) {
5624                         $this->loopCheckHash[$pdbk] = true;
5625                 }
5626                 $this->depth = $parent->depth + 1;
5627                 $this->numberedExpansionCache = $this->namedExpansionCache = array();
5628         }
5629
5630         function __toString() {
5631                 $s = 'tplframe{';
5632                 $first = true;
5633                 $args = $this->numberedArgs + $this->namedArgs;
5634                 foreach ( $args as $name => $value ) {
5635                         if ( $first ) {
5636                                 $first = false;
5637                         } else {
5638                                 $s .= ', ';
5639                         }
5640                         $s .= "\"$name\":\"" .
5641                                 str_replace( '"', '\\"', $value->ownerDocument->saveXML( $value ) ) . '"';
5642                 }
5643                 $s .= '}';
5644                 return $s;
5645         }
5646         /**
5647          * Returns true if there are no arguments in this frame
5648          */
5649         function isEmpty() {
5650                 return !count( $this->numberedArgs ) && !count( $this->namedArgs );
5651         }
5652
5653         function getNumberedArgument( $index ) {
5654                 if ( !isset( $this->numberedArgs[$index] ) ) {
5655                         return false;
5656                 }
5657                 if ( !isset( $this->numberedExpansionCache[$index] ) ) {
5658                         # No trimming for unnamed arguments
5659                         $this->numberedExpansionCache[$index] = $this->parent->expand( $this->numberedArgs[$index], self::STRIP_COMMENTS );
5660                 }
5661                 return $this->numberedExpansionCache[$index];
5662         }
5663
5664         function getNamedArgument( $name ) {
5665                 if ( !isset( $this->namedArgs[$name] ) ) {
5666                         return false;
5667                 }
5668                 if ( !isset( $this->namedExpansionCache[$name] ) ) {
5669                         # Trim named arguments post-expand, for backwards compatibility
5670                         $this->namedExpansionCache[$name] = trim(
5671                                 $this->parent->expand( $this->namedArgs[$name], self::STRIP_COMMENTS ) );
5672                 }
5673                 return $this->namedExpansionCache[$name];
5674         }
5675
5676         function getArgument( $name ) {
5677                 $text = $this->getNumberedArgument( $name );
5678                 if ( $text === false ) {
5679                         $text = $this->getNamedArgument( $name );
5680                 }
5681                 return $text;
5682         }
5683 }
5684
5685 /**
5686  * Stack class to help Parser::preprocessToDom()
5687  */
5688 class PPDStack {
5689         var $stack, $topAccum, $top;
5690
5691         function __construct() {
5692                 $this->stack = array();
5693                 $this->topAccum = '';
5694                 $this->top = false;
5695         }
5696
5697         function &getAccum() {
5698                 if ( count( $this->stack ) ) {
5699                         return $this->top->getAccum();
5700                 } else {
5701                         return $this->topAccum;
5702                 }
5703         }
5704
5705         function push( $data ) {
5706                 if ( $data instanceof PPDStackElement ) {
5707                         $this->stack[] = $data;
5708                 } else {
5709                         $this->stack[] = new PPDStackElement( $data );
5710                 }
5711                 $this->top =& $this->stack[ count( $this->stack ) - 1 ];
5712         }
5713
5714         function pop() {
5715                 if ( !count( $this->stack ) ) {
5716                         throw new MWException( __METHOD__.': no elements remaining' );
5717                 }
5718                 $temp = array_pop( $this->stack );
5719                 if ( count( $this->stack ) ) {
5720                         $this->top =& $this->stack[ count( $this->stack ) - 1 ];
5721                 } else {
5722                         $this->top = false;
5723                 }
5724         }
5725
5726         function getFlags() {
5727                 if ( !count( $this->stack ) ) {
5728                         return array(
5729                                 'findEquals' => false,
5730                                 'findPipe' => false,
5731                                 'inHeading' => false,
5732                         );
5733                 } else {
5734                         return $this->top->getFlags();
5735                 }
5736         }
5737 }
5738
5739 class PPDStackElement {
5740         var $open, $close, $count, $parts, $eqpos, $lineStart;
5741
5742         function __construct( $data = array() ) {
5743                 $this->parts = array( '' );
5744                 $this->eqpos = array();
5745
5746                 foreach ( $data as $name => $value ) {
5747                         $this->$name = $value;
5748                 }
5749         }
5750
5751         function &getAccum() {
5752                 return $this->parts[count($this->parts) - 1];
5753         }
5754
5755         function addPart( $s = '' ) {
5756                 $this->parts[] = $s;
5757         }
5758
5759         function getFlags() {
5760                 $partCount = count( $this->parts );
5761                 $findPipe = $this->open != "\n" && $this->open != '[';
5762                 return array(
5763                         'findPipe' => $findPipe,
5764                         'findEquals' => $findPipe && $partCount > 1 && !isset( $this->eqpos[$partCount - 1] ),
5765                         'inHeading' => $this->open == "\n",
5766                 );
5767         }
5768 }