includes/Parser.php

   1 <?php
   2 /**
   3  * File for Parser and related classes
   4  *
   5  * @package MediaWiki
   6  * @subpackage Parser
   7  */
   8
   9 /**
  10  * Update this version number when the ParserOutput format
  11  * changes in an incompatible way, so the parser cache
  12  * can automatically discard old data.
  13  */
  14 define( 'MW_PARSER_VERSION', '1.6.1' );
  15
  16 define( 'RLH_FOR_UPDATE', 1 );
  17
  18 # Allowed values for $mOutputType
  19 define( 'OT_HTML', 1 );
  20 define( 'OT_WIKI', 2 );
  21 define( 'OT_MSG' , 3 );
  22 define( 'OT_PREPROCESS', 4 );
  23
  24 # Flags for setFunctionHook
  25 define( 'SFH_NO_HASH', 1 );
  26
  27 # string parameter for extractTags which will cause it
  28 # to strip HTML comments in addition to regular
  29 # <XML>-style tags. This should not be anything we
  30 # may want to use in wikisyntax
  31 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  32
  33 # Constants needed for external link processing
  34 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  35 # Everything except bracket, space, or control characters
  36 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  37 # Including space, but excluding newlines
  38 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x0a\\x0d]' );
  39 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  40 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  41 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.
  42         EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  43 define( 'EXT_IMAGE_REGEX',
  44         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  45         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  46         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  47 );
  48
  49 // State constants for the definition list colon extraction
  50 define( 'MW_COLON_STATE_TEXT', 0 );
  51 define( 'MW_COLON_STATE_TAG', 1 );
  52 define( 'MW_COLON_STATE_TAGSTART', 2 );
  53 define( 'MW_COLON_STATE_CLOSETAG', 3 );
  54 define( 'MW_COLON_STATE_TAGSLASH', 4 );
  55 define( 'MW_COLON_STATE_COMMENT', 5 );
  56 define( 'MW_COLON_STATE_COMMENTDASH', 6 );
  57 define( 'MW_COLON_STATE_COMMENTDASHDASH', 7 );
  58
  59 /**
  60  * PHP Parser
  61  *
  62  * Processes wiki markup
  63  *
  64  * <pre>
  65  * There are four main entry points into the Parser class:
  66  * parse()
  67  *   produces HTML output
  68  * preSaveTransform().
  69  *   produces altered wiki markup.
  70  * transformMsg()
  71  *   performs brace substitution on MediaWiki messages
  72  * preprocess()
  73  *   removes HTML comments and expands templates
  74  *
  75  * Globals used:
  76  *    objects:   $wgLang, $wgContLang
  77  *
  78  * NOT $wgArticle, $wgUser or $wgTitle. Keep them away!
  79  *
  80  * settings:
  81  *  $wgUseTex*, $wgUseDynamicDates*, $wgInterwikiMagic*,
  82  *  $wgNamespacesWithSubpages, $wgAllowExternalImages*,
  83  *  $wgLocaltimezone, $wgAllowSpecialInclusion*,
  84  *  $wgMaxArticleSize*
  85  *
  86  *  * only within ParserOptions
  87  * </pre>
  88  *
  89  * @package MediaWiki
  90  */
  91 class Parser
  92 {
  93         /**#@+
  94          * @private
  95          */
  96         # Persistent:
  97         var $mTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables;
  98
  99         # Cleared with clearState():
 100         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 101         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 102         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 103         var $mIncludeSizes;
 104         var $mTemplates,        // cache of already loaded templates, avoids
 105                                 // multiple SQL queries for the same string
 106             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 107                                 // in this path. Used for loop detection.
 108
 109         # Temporary
 110         # These are variables reset at least once per parse regardless of $clearState
 111         var $mOptions,      // ParserOptions object
 112                 $mTitle,        // Title context, used for self-link rendering and similar things
 113                 $mOutputType,   // Output type, one of the OT_xxx constants
 114                 $ot,            // Shortcut alias, see setOutputType()
 115                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 116                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 117                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 118
 119         /**#@-*/
 120
 121         /**
 122          * Constructor
 123          *
 124          * @public
 125          */
 126         function Parser() {
 127                 $this->mTagHooks = array();
 128                 $this->mFunctionHooks = array();
 129                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 130                 $this->mFirstCall = true;
 131         }
 132
 133         /**
 134          * Do various kinds of initialisation on the first call of the parser
 135          */
 136         function firstCallInit() {
 137                 if ( !$this->mFirstCall ) {
 138                         return;
 139                 }
 140
 141                 wfProfileIn( __METHOD__ );
 142                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 143
 144                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 145
 146                 $this->setFunctionHook( 'int', array( 'CoreParserFunctions', 'intFunction' ), SFH_NO_HASH );
 147                 $this->setFunctionHook( 'ns', array( 'CoreParserFunctions', 'ns' ), SFH_NO_HASH );
 148                 $this->setFunctionHook( 'urlencode', array( 'CoreParserFunctions', 'urlencode' ), SFH_NO_HASH );
 149                 $this->setFunctionHook( 'lcfirst', array( 'CoreParserFunctions', 'lcfirst' ), SFH_NO_HASH );
 150                 $this->setFunctionHook( 'ucfirst', array( 'CoreParserFunctions', 'ucfirst' ), SFH_NO_HASH );
 151                 $this->setFunctionHook( 'lc', array( 'CoreParserFunctions', 'lc' ), SFH_NO_HASH );
 152                 $this->setFunctionHook( 'uc', array( 'CoreParserFunctions', 'uc' ), SFH_NO_HASH );
 153                 $this->setFunctionHook( 'localurl', array( 'CoreParserFunctions', 'localurl' ), SFH_NO_HASH );
 154                 $this->setFunctionHook( 'localurle', array( 'CoreParserFunctions', 'localurle' ), SFH_NO_HASH );
 155                 $this->setFunctionHook( 'fullurl', array( 'CoreParserFunctions', 'fullurl' ), SFH_NO_HASH );
 156                 $this->setFunctionHook( 'fullurle', array( 'CoreParserFunctions', 'fullurle' ), SFH_NO_HASH );
 157                 $this->setFunctionHook( 'formatnum', array( 'CoreParserFunctions', 'formatnum' ), SFH_NO_HASH );
 158                 $this->setFunctionHook( 'grammar', array( 'CoreParserFunctions', 'grammar' ), SFH_NO_HASH );
 159                 $this->setFunctionHook( 'plural', array( 'CoreParserFunctions', 'plural' ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'numberofpages', array( 'CoreParserFunctions', 'numberofpages' ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'numberofusers', array( 'CoreParserFunctions', 'numberofusers' ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'numberoffiles', array( 'CoreParserFunctions', 'numberoffiles' ), SFH_NO_HASH );
 164                 $this->setFunctionHook( 'numberofadmins', array( 'CoreParserFunctions', 'numberofadmins' ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'language', array( 'CoreParserFunctions', 'language' ), SFH_NO_HASH );
 166                 $this->setFunctionHook( 'padleft', array( 'CoreParserFunctions', 'padleft' ), SFH_NO_HASH );
 167                 $this->setFunctionHook( 'padright', array( 'CoreParserFunctions', 'padright' ), SFH_NO_HASH );
 168                 $this->setFunctionHook( 'anchorencode', array( 'CoreParserFunctions', 'anchorencode' ), SFH_NO_HASH );
 169                 $this->setFunctionHook( 'special', array( 'CoreParserFunctions', 'special' ) );
 170
 171                 if ( $wgAllowDisplayTitle ) {
 172                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 173                 }
 174                 if ( $wgAllowSlowParserFunctions ) {
 175                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 176                 }
 177
 178                 $this->initialiseVariables();
 179                 $this->mFirstCall = false;
 180                 wfProfileOut( __METHOD__ );
 181         }
 182
 183         /**
 184          * Clear Parser state
 185          *
 186          * @private
 187          */
 188         function clearState() {
 189                 wfProfileIn( __METHOD__ );
 190                 if ( $this->mFirstCall ) {
 191                         $this->firstCallInit();
 192                 }
 193                 $this->mOutput = new ParserOutput;
 194                 $this->mAutonumber = 0;
 195                 $this->mLastSection = '';
 196                 $this->mDTopen = false;
 197                 $this->mIncludeCount = array();
 198                 $this->mStripState = new StripState;
 199                 $this->mArgStack = array();
 200                 $this->mInPre = false;
 201                 $this->mInterwikiLinkHolders = array(
 202                         'texts' => array(),
 203                         'titles' => array()
 204                 );
 205                 $this->mLinkHolders = array(
 206                         'namespaces' => array(),
 207                         'dbkeys' => array(),
 208                         'queries' => array(),
 209                         'texts' => array(),
 210                         'titles' => array()
 211                 );
 212                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 213
 214                 /**
 215                  * Prefix for temporary replacement strings for the multipass parser.
 216                  * \x07 should never appear in input as it's disallowed in XML.
 217                  * Using it at the front also gives us a little extra robustness
 218                  * since it shouldn't match when butted up against identifier-like
 219                  * string constructs.
 220                  */
 221                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 222
 223                 # Clear these on every parse, bug 4549
 224                 $this->mTemplates = array();
 225                 $this->mTemplatePath = array();
 226
 227                 $this->mShowToc = true;
 228                 $this->mForceTocPosition = false;
 229                 $this->mIncludeSizes = array(
 230                         'pre-expand' => 0,
 231                         'post-expand' => 0,
 232                         'arg' => 0
 233                 );
 234
 235                 wfRunHooks( 'ParserClearState', array( &$this ) );
 236                 wfProfileOut( __METHOD__ );
 237         }
 238
 239         function setOutputType( $ot ) {
 240                 $this->mOutputType = $ot;
 241                 // Shortcut alias
 242                 $this->ot = array(
 243                         'html' => $ot == OT_HTML,
 244                         'wiki' => $ot == OT_WIKI,
 245                         'msg' => $ot == OT_MSG,
 246                         'pre' => $ot == OT_PREPROCESS,
 247                 );
 248         }
 249
 250         /**
 251          * Accessor for mUniqPrefix.
 252          *
 253          * @public
 254          */
 255         function uniqPrefix() {
 256                 return $this->mUniqPrefix;
 257         }
 258
 259         /**
 260          * Convert wikitext to HTML
 261          * Do not call this function recursively.
 262          *
 263          * @private
 264          * @param string $text Text we want to parse
 265          * @param Title &$title A title object
 266          * @param array $options
 267          * @param boolean $linestart
 268          * @param boolean $clearState
 269          * @param int $revid number to pass in {{REVISIONID}}
 270          * @return ParserOutput a ParserOutput
 271          */
 272         function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 273                 /**
 274                  * First pass--just handle <nowiki> sections, pass the rest off
 275                  * to internalParse() which does all the real work.
 276                  */
 277
 278                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 279                 $fname = 'Parser::parse-' . wfGetCaller();
 280                 wfProfileIn( __METHOD__ );
 281                 wfProfileIn( $fname );
 282
 283                 if ( $clearState ) {
 284                         $this->clearState();
 285                 }
 286
 287                 $this->mOptions = $options;
 288                 $this->mTitle =& $title;
 289                 $oldRevisionId = $this->mRevisionId;
 290                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 291                 if( $revid !== null ) {
 292                         $this->mRevisionId = $revid;
 293                         $this->mRevisionTimestamp = null;
 294                 }
 295                 $this->setOutputType( OT_HTML );
 296                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 297                 $text = $this->strip( $text, $this->mStripState );
 298                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 299                 $text = $this->internalParse( $text );
 300                 $text = $this->mStripState->unstripGeneral( $text );
 301
 302                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 303                 $fixtags = array(
 304                         # french spaces, last one Guillemet-left
 305                         # only if there is something before the space
 306                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 307                         # french spaces, Guillemet-right
 308                         '/(\\302\\253) /' => '\\1&nbsp;',
 309                 );
 310                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 311
 312                 # only once and last
 313                 $text = $this->doBlockLevels( $text, $linestart );
 314
 315                 $this->replaceLinkHolders( $text );
 316
 317                 # the position of the parserConvert() call should not be changed. it
 318                 # assumes that the links are all replaced and the only thing left
 319                 # is the <nowiki> mark.
 320                 # Side-effects: this calls $this->mOutput->setTitleText()
 321                 $text = $wgContLang->parserConvert( $text, $this );
 322
 323                 $text = $this->mStripState->unstripNoWiki( $text );
 324
 325                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 326
 327                 $text = Sanitizer::normalizeCharReferences( $text );
 328
 329                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 330                         $text = Parser::tidy($text);
 331                 } else {
 332                         # attempt to sanitize at least some nesting problems
 333                         # (bug #2702 and quite a few others)
 334                         $tidyregs = array(
 335                                 # ''Something [http://www.cool.com cool''] -->
 336                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 337                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 338                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 339                                 # fix up an anchor inside another anchor, only
 340                                 # at least for a single single nested link (bug 3695)
 341                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 342                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 343                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 344                                 # contains a div, so fix it up here; replace
 345                                 # div with escaped text
 346                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 347                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 348                                 # remove empty italic or bold tag pairs, some
 349                                 # introduced by rules above
 350                                 '/<([bi])><\/\\1>/' => '',
 351                         );
 352
 353                         $text = preg_replace(
 354                                 array_keys( $tidyregs ),
 355                                 array_values( $tidyregs ),
 356                                 $text );
 357                 }
 358
 359                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 360
 361                 # Information on include size limits, for the benefit of users who try to skirt them
 362                 if ( max( $this->mIncludeSizes ) > 1000 ) {
 363                         $max = $this->mOptions->getMaxIncludeSize();
 364                         $text .= "<!-- \n" .
 365                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']} bytes\n" .
 366                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']} bytes\n" .
 367                                 "Template argument size: {$this->mIncludeSizes['arg']} bytes\n" .
 368                                 "Maximum: $max bytes\n" .
 369                                 "-->\n";
 370                 }
 371                 $this->mOutput->setText( $text );
 372                 $this->mRevisionId = $oldRevisionId;
 373                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 374                 wfProfileOut( $fname );
 375                 wfProfileOut( __METHOD__ );
 376
 377                 return $this->mOutput;
 378         }
 379
 380         /**
 381          * Recursive parser entry point that can be called from an extension tag
 382          * hook.
 383          */
 384         function recursiveTagParse( $text ) {
 385                 wfProfileIn( __METHOD__ );
 386                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 387                 $text = $this->strip( $text, $this->mStripState );
 388                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 389                 $text = $this->internalParse( $text );
 390                 wfProfileOut( __METHOD__ );
 391                 return $text;
 392         }
 393
 394         /**
 395          * Expand templates and variables in the text, producing valid, static wikitext.
 396          * Also removes comments.
 397          */
 398         function preprocess( $text, $title, $options ) {
 399                 wfProfileIn( __METHOD__ );
 400                 $this->clearState();
 401                 $this->setOutputType( OT_PREPROCESS );
 402                 $this->mOptions = $options;
 403                 $this->mTitle = $title;
 404                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 405                 $text = $this->strip( $text, $this->mStripState );
 406                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 407                 if ( $this->mOptions->getRemoveComments() ) {
 408                         $text = Sanitizer::removeHTMLcomments( $text );
 409                 }
 410                 $text = $this->replaceVariables( $text );
 411                 $text = $this->mStripState->unstripBoth( $text );
 412                 wfProfileOut( __METHOD__ );
 413                 return $text;
 414         }
 415
 416         /**
 417          * Get a random string
 418          *
 419          * @private
 420          * @static
 421          */
 422         function getRandomString() {
 423                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 424         }
 425
 426         function &getTitle() { return $this->mTitle; }
 427         function getOptions() { return $this->mOptions; }
 428
 429         function getFunctionLang() {
 430                 global $wgLang, $wgContLang;
 431                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 432         }
 433
 434         /**
 435          * Replaces all occurrences of HTML-style comments and the given tags
 436          * in the text with a random marker and returns teh next text. The output
 437          * parameter $matches will be an associative array filled with data in
 438          * the form:
 439          *   'UNIQ-xxxxx' => array(
 440          *     'element',
 441          *     'tag content',
 442          *     array( 'param' => 'x' ),
 443          *     '<element param="x">tag content</element>' ) )
 444          *
 445          * @param $elements list of element names. Comments are always extracted.
 446          * @param $text Source text string.
 447          * @param $uniq_prefix
 448          *
 449          * @private
 450          * @static
 451          */
 452         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 453                 static $n = 1;
 454                 $stripped = '';
 455                 $matches = array();
 456
 457                 $taglist = implode( '|', $elements );
 458                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 459
 460                 while ( '' != $text ) {
 461                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 462                         $stripped .= $p[0];
 463                         if( count( $p ) < 5 ) {
 464                                 break;
 465                         }
 466                         if( count( $p ) > 5 ) {
 467                                 // comment
 468                                 $element    = $p[4];
 469                                 $attributes = '';
 470                                 $close      = '';
 471                                 $inside     = $p[5];
 472                         } else {
 473                                 // tag
 474                                 $element    = $p[1];
 475                                 $attributes = $p[2];
 476                                 $close      = $p[3];
 477                                 $inside     = $p[4];
 478                         }
 479
 480                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . '-QINU';
 481                         $stripped .= $marker;
 482
 483                         if ( $close === '/>' ) {
 484                                 // Empty element tag, <tag />
 485                                 $content = null;
 486                                 $text = $inside;
 487                                 $tail = null;
 488                         } else {
 489                                 if( $element == '!--' ) {
 490                                         $end = '/(-->)/';
 491                                 } else {
 492                                         $end = "/(<\\/$element\\s*>)/i";
 493                                 }
 494                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 495                                 $content = $q[0];
 496                                 if( count( $q ) < 3 ) {
 497                                         # No end tag -- let it run out to the end of the text.
 498                                         $tail = '';
 499                                         $text = '';
 500                                 } else {
 501                                         $tail = $q[1];
 502                                         $text = $q[2];
 503                                 }
 504                         }
 505
 506                         $matches[$marker] = array( $element,
 507                                 $content,
 508                                 Sanitizer::decodeTagAttributes( $attributes ),
 509                                 "<$element$attributes$close$content$tail" );
 510                 }
 511                 return $stripped;
 512         }
 513
 514         /**
 515          * Strips and renders nowiki, pre, math, hiero
 516          * If $render is set, performs necessary rendering operations on plugins
 517          * Returns the text, and fills an array with data needed in unstrip()
 518          *
 519          * @param StripState $state
 520          *
 521          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 522          *  will be stripped in addition to other tags. This is important
 523          *  for section editing, where these comments cause confusion when
 524          *  counting the sections in the wikisource
 525          *
 526          * @param array dontstrip contains tags which should not be stripped;
 527          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 528          *
 529          * @private
 530          */
 531         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 532                 global $wgContLang;
 533                 wfProfileIn( __METHOD__ );
 534                 $render = ($this->mOutputType == OT_HTML);
 535
 536                 $uniq_prefix = $this->mUniqPrefix;
 537                 $commentState = new ReplacementArray;
 538
 539                 $elements = array_merge(
 540                         array( 'nowiki', 'gallery' ),
 541                         array_keys( $this->mTagHooks ) );
 542                 global $wgRawHtml;
 543                 if( $wgRawHtml ) {
 544                         $elements[] = 'html';
 545                 }
 546                 if( $this->mOptions->getUseTeX() ) {
 547                         $elements[] = 'math';
 548                 }
 549
 550                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 551                 foreach ( $elements AS $k => $v ) {
 552                         if ( !in_array ( $v , $dontstrip ) ) continue;
 553                         unset ( $elements[$k] );
 554                 }
 555
 556                 $matches = array();
 557                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 558
 559                 foreach( $matches as $marker => $data ) {
 560                         list( $element, $content, $params, $tag ) = $data;
 561                         if( $render ) {
 562                                 $tagName = strtolower( $element );
 563                                 wfProfileIn( __METHOD__."-render-$tagName" );
 564                                 switch( $tagName ) {
 565                                 case '!--':
 566                                         // Comment
 567                                         if( substr( $tag, -3 ) == '-->' ) {
 568                                                 $output = $tag;
 569                                         } else {
 570                                                 // Unclosed comment in input.
 571                                                 // Close it so later stripping can remove it
 572                                                 $output = "$tag-->";
 573                                         }
 574                                         break;
 575                                 case 'html':
 576                                         if( $wgRawHtml ) {
 577                                                 $output = $content;
 578                                                 break;
 579                                         }
 580                                         // Shouldn't happen otherwise. :)
 581                                 case 'nowiki':
 582                                         $output = Xml::escapeTagsOnly( $content );
 583                                         break;
 584                                 case 'math':
 585                                         $output = $wgContLang->armourMath( MathRenderer::renderMath( $content ) );
 586                                         break;
 587                                 case 'gallery':
 588                                         $output = $this->renderImageGallery( $content, $params );
 589                                         break;
 590                                 default:
 591                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 592                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 593                                                         array( $content, $params, $this ) );
 594                                         } else {
 595                                                 throw new MWException( "Invalid call hook $element" );
 596                                         }
 597                                 }
 598                                 wfProfileOut( __METHOD__."-render-$tagName" );
 599                         } else {
 600                                 // Just stripping tags; keep the source
 601                                 $output = $tag;
 602                         }
 603
 604                         // Unstrip the output, because unstrip() is no longer recursive so
 605                         // it won't do it itself
 606                         $output = $state->unstripBoth( $output );
 607
 608                         if( !$stripcomments && $element == '!--' ) {
 609                                 $commentState->setPair( $marker, $output );
 610                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 611                                 $state->nowiki->setPair( $marker, $output );
 612                         } else {
 613                                 $state->general->setPair( $marker, $output );
 614                         }
 615                 }
 616
 617                 # Unstrip comments unless explicitly told otherwise.
 618                 # (The comments are always stripped prior to this point, so as to
 619                 # not invoke any extension tags / parser hooks contained within
 620                 # a comment.)
 621                 if ( !$stripcomments ) {
 622                         // Put them all back and forget them
 623                         $text = $commentState->replace( $text );
 624                 }
 625
 626                 wfProfileOut( __METHOD__ );
 627                 return $text;
 628         }
 629
 630         /**
 631          * Restores pre, math, and other extensions removed by strip()
 632          *
 633          * always call unstripNoWiki() after this one
 634          * @private
 635          * @deprecated use $this->mStripState->unstrip()
 636          */
 637         function unstrip( $text, $state ) {
 638                 return $state->unstripGeneral( $text );
 639         }
 640
 641         /**
 642          * Always call this after unstrip() to preserve the order
 643          *
 644          * @private
 645          * @deprecated use $this->mStripState->unstrip()
 646          */
 647         function unstripNoWiki( $text, $state ) {
 648                 return $state->unstripNoWiki( $text );
 649         }
 650
 651         /**
 652          * @deprecated use $this->mStripState->unstripBoth()
 653          */
 654         function unstripForHTML( $text ) {
 655                 return $this->mStripState->unstripBoth( $text );
 656         }
 657
 658         /**
 659          * Add an item to the strip state
 660          * Returns the unique tag which must be inserted into the stripped text
 661          * The tag will be replaced with the original text in unstrip()
 662          *
 663          * @private
 664          */
 665         function insertStripItem( $text, &$state ) {
 666                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 667                 $state->general->setPair( $rnd, $text );
 668                 return $rnd;
 669         }
 670
 671         /**
 672          * Interface with html tidy, used if $wgUseTidy = true.
 673          * If tidy isn't able to correct the markup, the original will be
 674          * returned in all its glory with a warning comment appended.
 675          *
 676          * Either the external tidy program or the in-process tidy extension
 677          * will be used depending on availability. Override the default
 678          * $wgTidyInternal setting to disable the internal if it's not working.
 679          *
 680          * @param string $text Hideous HTML input
 681          * @return string Corrected HTML output
 682          * @public
 683          * @static
 684          */
 685         function tidy( $text ) {
 686                 global $wgTidyInternal;
 687                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 688 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 689 '<head><title>test</title></head><body>'.$text.'</body></html>';
 690                 if( $wgTidyInternal ) {
 691                         $correctedtext = Parser::internalTidy( $wrappedtext );
 692                 } else {
 693                         $correctedtext = Parser::externalTidy( $wrappedtext );
 694                 }
 695                 if( is_null( $correctedtext ) ) {
 696                         wfDebug( "Tidy error detected!\n" );
 697                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 698                 }
 699                 return $correctedtext;
 700         }
 701
 702         /**
 703          * Spawn an external HTML tidy process and get corrected markup back from it.
 704          *
 705          * @private
 706          * @static
 707          */
 708         function externalTidy( $text ) {
 709                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 710                 $fname = 'Parser::externalTidy';
 711                 wfProfileIn( $fname );
 712
 713                 $cleansource = '';
 714                 $opts = ' -utf8';
 715
 716                 $descriptorspec = array(
 717                         0 => array('pipe', 'r'),
 718                         1 => array('pipe', 'w'),
 719                         2 => array('file', '/dev/null', 'a')
 720                 );
 721                 $pipes = array();
 722                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 723                 if (is_resource($process)) {
 724                         // Theoretically, this style of communication could cause a deadlock
 725                         // here. If the stdout buffer fills up, then writes to stdin could
 726                         // block. This doesn't appear to happen with tidy, because tidy only
 727                         // writes to stdout after it's finished reading from stdin. Search
 728                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 729                         fwrite($pipes[0], $text);
 730                         fclose($pipes[0]);
 731                         while (!feof($pipes[1])) {
 732                                 $cleansource .= fgets($pipes[1], 1024);
 733                         }
 734                         fclose($pipes[1]);
 735                         proc_close($process);
 736                 }
 737
 738                 wfProfileOut( $fname );
 739
 740                 if( $cleansource == '' && $text != '') {
 741                         // Some kind of error happened, so we couldn't get the corrected text.
 742                         // Just give up; we'll use the source text and append a warning.
 743                         return null;
 744                 } else {
 745                         return $cleansource;
 746                 }
 747         }
 748
 749         /**
 750          * Use the HTML tidy PECL extension to use the tidy library in-process,
 751          * saving the overhead of spawning a new process. Currently written to
 752          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 753          *
 754          * 'pear install tidy' should be able to compile the extension module.
 755          *
 756          * @private
 757          * @static
 758          */
 759         function internalTidy( $text ) {
 760                 global $wgTidyConf;
 761                 $fname = 'Parser::internalTidy';
 762                 wfProfileIn( $fname );
 763
 764                 tidy_load_config( $wgTidyConf );
 765                 tidy_set_encoding( 'utf8' );
 766                 tidy_parse_string( $text );
 767                 tidy_clean_repair();
 768                 if( tidy_get_status() == 2 ) {
 769                         // 2 is magic number for fatal error
 770                         // http://www.php.net/manual/en/function.tidy-get-status.php
 771                         $cleansource = null;
 772                 } else {
 773                         $cleansource = tidy_get_output();
 774                 }
 775                 wfProfileOut( $fname );
 776                 return $cleansource;
 777         }
 778
 779         /**
 780          * parse the wiki syntax used to render tables
 781          *
 782          * @private
 783          */
 784         function doTableStuff ( $text ) {
 785                 $fname = 'Parser::doTableStuff';
 786                 wfProfileIn( $fname );
 787
 788                 $lines = explode ( "\n" , $text );
 789                 $td_history = array (); // Is currently a td tag open?
 790                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 791                 $tr_history = array (); // Is currently a tr tag open?
 792                 $tr_attributes = array (); // history of tr attributes
 793                 $has_opened_tr = array(); // Did this table open a <tr> element?
 794                 $indent_level = 0; // indent level of the table
 795                 foreach ( $lines as $key => $line )
 796                 {
 797                         $line = trim ( $line );
 798
 799                         if( $line == '' ) { // empty line, go to next line
 800                                 continue;
 801                         }
 802                         $first_character = $line{0};
 803                         $matches = array();
 804
 805                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 806                                 // First check if we are starting a new table
 807                                 $indent_level = strlen( $matches[1] );
 808
 809                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 810                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 811
 812                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 813                                 array_push ( $td_history , false );
 814                                 array_push ( $last_tag_history , '' );
 815                                 array_push ( $tr_history , false );
 816                                 array_push ( $tr_attributes , '' );
 817                                 array_push ( $has_opened_tr , false );
 818                         } else if ( count ( $td_history ) == 0 ) {
 819                                 // Don't do any of the following
 820                                 continue;
 821                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 822                                 // We are ending a table
 823                                 $line = '</table>' . substr ( $line , 2 );
 824                                 $last_tag = array_pop ( $last_tag_history );
 825
 826                                 if ( !array_pop ( $has_opened_tr ) ) {
 827                                         $line = "<tr><td></td></tr>{$line}";
 828                                 }
 829
 830                                 if ( array_pop ( $tr_history ) ) {
 831                                         $line = "</tr>{$line}";
 832                                 }
 833
 834                                 if ( array_pop ( $td_history ) ) {
 835                                         $line = "</{$last_tag}>{$line}";
 836                                 }
 837                                 array_pop ( $tr_attributes );
 838                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 839                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 840                                 // Now we have a table row
 841                                 $line = preg_replace( '#^\|-+#', '', $line );
 842
 843                                 // Whats after the tag is now only attributes
 844                                 $attributes = $this->mStripState->unstripBoth( $line );
 845                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 846                                 array_pop ( $tr_attributes );
 847                                 array_push ( $tr_attributes , $attributes );
 848
 849                                 $line = '';
 850                                 $last_tag = array_pop ( $last_tag_history );
 851                                 array_pop ( $has_opened_tr );
 852                                 array_push ( $has_opened_tr , true );
 853
 854                                 if ( array_pop ( $tr_history ) ) {
 855                                         $line = '</tr>';
 856                                 }
 857
 858                                 if ( array_pop ( $td_history ) ) {
 859                                         $line = "</{$last_tag}>{$line}";
 860                                 }
 861
 862                                 $lines[$key] = $line;
 863                                 array_push ( $tr_history , false );
 864                                 array_push ( $td_history , false );
 865                                 array_push ( $last_tag_history , '' );
 866                         }
 867                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 868                                 // This might be cell elements, td, th or captions
 869                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 870                                         $first_character = '+';
 871                                         $line = substr ( $line , 1 );
 872                                 }
 873
 874                                 $line = substr ( $line , 1 );
 875
 876                                 if ( $first_character == '!' ) {
 877                                         $line = str_replace ( '!!' , '||' , $line );
 878                                 }
 879
 880                                 // Split up multiple cells on the same line.
 881                                 // FIXME : This can result in improper nesting of tags processed
 882                                 // by earlier parser steps, but should avoid splitting up eg
 883                                 // attribute values containing literal "||".
 884                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 885
 886                                 $lines[$key] = '';
 887
 888                                 // Loop through each table cell
 889                                 foreach ( $cells as $cell )
 890                                 {
 891                                         $previous = '';
 892                                         if ( $first_character != '+' )
 893                                         {
 894                                                 $tr_after = array_pop ( $tr_attributes );
 895                                                 if ( !array_pop ( $tr_history ) ) {
 896                                                         $previous = "<tr{$tr_after}>\n";
 897                                                 }
 898                                                 array_push ( $tr_history , true );
 899                                                 array_push ( $tr_attributes , '' );
 900                                                 array_pop ( $has_opened_tr );
 901                                                 array_push ( $has_opened_tr , true );
 902                                         }
 903
 904                                         $last_tag = array_pop ( $last_tag_history );
 905
 906                                         if ( array_pop ( $td_history ) ) {
 907                                                 $previous = "</{$last_tag}>{$previous}";
 908                                         }
 909
 910                                         if ( $first_character == '|' ) {
 911                                                 $last_tag = 'td';
 912                                         } else if ( $first_character == '!' ) {
 913                                                 $last_tag = 'th';
 914                                         } else if ( $first_character == '+' ) {
 915                                                 $last_tag = 'caption';
 916                                         } else {
 917                                                 $last_tag = '';
 918                                         }
 919
 920                                         array_push ( $last_tag_history , $last_tag );
 921
 922                                         // A cell could contain both parameters and data
 923                                         $cell_data = explode ( '|' , $cell , 2 );
 924
 925                                         // Bug 553: Note that a '|' inside an invalid link should not
 926                                         // be mistaken as delimiting cell parameters
 927                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 928                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 929                                         } else if ( count ( $cell_data ) == 1 )
 930                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 931                                         else {
 932                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 933                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 934                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 935                                         }
 936
 937                                         $lines[$key] .= $cell;
 938                                         array_push ( $td_history , true );
 939                                 }
 940                         }
 941                 }
 942
 943                 // Closing open td, tr && table
 944                 while ( count ( $td_history ) > 0 )
 945                 {
 946                         if ( array_pop ( $td_history ) ) {
 947                                 $lines[] = '</td>' ;
 948                         }
 949                         if ( array_pop ( $tr_history ) ) {
 950                                 $lines[] = '</tr>' ;
 951                         }
 952                         if ( !array_pop ( $has_opened_tr ) ) {
 953                                 $lines[] = "<tr><td></td></tr>" ;
 954                         }
 955
 956                         $lines[] = '</table>' ;
 957                 }
 958
 959                 $output = implode ( "\n" , $lines ) ;
 960
 961                 // special case: don't return empty table
 962                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 963                         $output = '';
 964                 }
 965
 966                 wfProfileOut( $fname );
 967
 968                 return $output;
 969         }
 970
 971         /**
 972          * Helper function for parse() that transforms wiki markup into
 973          * HTML. Only called for $mOutputType == OT_HTML.
 974          *
 975          * @private
 976          */
 977         function internalParse( $text ) {
 978                 $args = array();
 979                 $isMain = true;
 980                 $fname = 'Parser::internalParse';
 981                 wfProfileIn( $fname );
 982
 983                 # Hook to suspend the parser in this state
 984                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 985                         wfProfileOut( $fname );
 986                         return $text ;
 987                 }
 988
 989                 # Remove <noinclude> tags and <includeonly> sections
 990                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 991                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 992                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
 993
 994                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
 995
 996                 $text = $this->replaceVariables( $text, $args );
 997
 998                 // Tables need to come after variable replacement for things to work
 999                 // properly; putting them before other transformations should keep
1000                 // exciting things like link expansions from showing up in surprising
1001                 // places.
1002                 $text = $this->doTableStuff( $text );
1003
1004                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1005
1006                 $text = $this->stripToc( $text );
1007                 $this->stripNoGallery( $text );
1008                 $text = $this->doHeadings( $text );
1009                 if($this->mOptions->getUseDynamicDates()) {
1010                         $df =& DateFormatter::getInstance();
1011                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1012                 }
1013                 $text = $this->doAllQuotes( $text );
1014                 $text = $this->replaceInternalLinks( $text );
1015                 $text = $this->replaceExternalLinks( $text );
1016
1017                 # replaceInternalLinks may sometimes leave behind
1018                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1019                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1020
1021                 $text = $this->doMagicLinks( $text );
1022                 $text = $this->formatHeadings( $text, $isMain );
1023
1024                 wfProfileOut( $fname );
1025                 return $text;
1026         }
1027
1028         /**
1029          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1030          * magic external links.
1031          *
1032          * @private
1033          */
1034         function &doMagicLinks( &$text ) {
1035                 wfProfileIn( __METHOD__ );
1036                 $text = preg_replace_callback(
1037                         '!(?:                           # Start cases
1038                             <a.*?</a> |                 # Skip link text
1039                             <.*?> |                     # Skip stuff inside HTML elements
1040                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1041                             ISBN\s+(\b[0-9Xx\ \-]+)     # ISBN, capture number as m[2]
1042                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1043                 wfProfileOut( __METHOD__ );
1044                 return $text;
1045         }
1046
1047         function magicLinkCallback( $m ) {
1048                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1049                         # Skip HTML element
1050                         return $m[0];
1051                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1052                         $isbn = $m[2];
1053                         $num = strtr( $isbn, array(
1054                                 '-' => '',
1055                                 ' ' => '',
1056                                 'x' => 'X',
1057                         ));
1058                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1059                         $text = '<a href="' .
1060                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1061                                 "\" class=\"internal\">ISBN $isbn</a>";
1062                 } else {
1063                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1064                                 $keyword = 'RFC';
1065                                 $urlmsg = 'rfcurl';
1066                                 $id = $m[1];
1067                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1068                                 $keyword = 'PMID';
1069                                 $urlmsg = 'pubmedurl';
1070                                 $id = $m[1];
1071                         } else {
1072                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1073                                         substr($m[0], 0, 20 ) . '"' );
1074                         }
1075
1076                         $url = wfMsg( $urlmsg, $id);
1077                         $sk =& $this->mOptions->getSkin();
1078                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1079                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1080                 }
1081                 return $text;
1082         }
1083
1084         /**
1085          * Parse headers and return html
1086          *
1087          * @private
1088          */
1089         function doHeadings( $text ) {
1090                 $fname = 'Parser::doHeadings';
1091                 wfProfileIn( $fname );
1092                 for ( $i = 6; $i >= 1; --$i ) {
1093                         $h = str_repeat( '=', $i );
1094                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1095                           "<h{$i}>\\1</h{$i}>\\2", $text );
1096                 }
1097                 wfProfileOut( $fname );
1098                 return $text;
1099         }
1100
1101         /**
1102          * Replace single quotes with HTML markup
1103          * @private
1104          * @return string the altered text
1105          */
1106         function doAllQuotes( $text ) {
1107                 $fname = 'Parser::doAllQuotes';
1108                 wfProfileIn( $fname );
1109                 $outtext = '';
1110                 $lines = explode( "\n", $text );
1111                 foreach ( $lines as $line ) {
1112                         $outtext .= $this->doQuotes ( $line ) . "\n";
1113                 }
1114                 $outtext = substr($outtext, 0,-1);
1115                 wfProfileOut( $fname );
1116                 return $outtext;
1117         }
1118
1119         /**
1120          * Helper function for doAllQuotes()
1121          * @private
1122          */
1123         function doQuotes( $text ) {
1124                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1125                 if ( count( $arr ) == 1 )
1126                         return $text;
1127                 else
1128                 {
1129                         # First, do some preliminary work. This may shift some apostrophes from
1130                         # being mark-up to being text. It also counts the number of occurrences
1131                         # of bold and italics mark-ups.
1132                         $i = 0;
1133                         $numbold = 0;
1134                         $numitalics = 0;
1135                         foreach ( $arr as $r )
1136                         {
1137                                 if ( ( $i % 2 ) == 1 )
1138                                 {
1139                                         # If there are ever four apostrophes, assume the first is supposed to
1140                                         # be text, and the remaining three constitute mark-up for bold text.
1141                                         if ( strlen( $arr[$i] ) == 4 )
1142                                         {
1143                                                 $arr[$i-1] .= "'";
1144                                                 $arr[$i] = "'''";
1145                                         }
1146                                         # If there are more than 5 apostrophes in a row, assume they're all
1147                                         # text except for the last 5.
1148                                         else if ( strlen( $arr[$i] ) > 5 )
1149                                         {
1150                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1151                                                 $arr[$i] = "'''''";
1152                                         }
1153                                         # Count the number of occurrences of bold and italics mark-ups.
1154                                         # We are not counting sequences of five apostrophes.
1155                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1156                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1157                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1158                                 }
1159                                 $i++;
1160                         }
1161
1162                         # If there is an odd number of both bold and italics, it is likely
1163                         # that one of the bold ones was meant to be an apostrophe followed
1164                         # by italics. Which one we cannot know for certain, but it is more
1165                         # likely to be one that has a single-letter word before it.
1166                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1167                         {
1168                                 $i = 0;
1169                                 $firstsingleletterword = -1;
1170                                 $firstmultiletterword = -1;
1171                                 $firstspace = -1;
1172                                 foreach ( $arr as $r )
1173                                 {
1174                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1175                                         {
1176                                                 $x1 = substr ($arr[$i-1], -1);
1177                                                 $x2 = substr ($arr[$i-1], -2, 1);
1178                                                 if ($x1 == ' ') {
1179                                                         if ($firstspace == -1) $firstspace = $i;
1180                                                 } else if ($x2 == ' ') {
1181                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1182                                                 } else {
1183                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1184                                                 }
1185                                         }
1186                                         $i++;
1187                                 }
1188
1189                                 # If there is a single-letter word, use it!
1190                                 if ($firstsingleletterword > -1)
1191                                 {
1192                                         $arr [ $firstsingleletterword ] = "''";
1193                                         $arr [ $firstsingleletterword-1 ] .= "'";
1194                                 }
1195                                 # If not, but there's a multi-letter word, use that one.
1196                                 else if ($firstmultiletterword > -1)
1197                                 {
1198                                         $arr [ $firstmultiletterword ] = "''";
1199                                         $arr [ $firstmultiletterword-1 ] .= "'";
1200                                 }
1201                                 # ... otherwise use the first one that has neither.
1202                                 # (notice that it is possible for all three to be -1 if, for example,
1203                                 # there is only one pentuple-apostrophe in the line)
1204                                 else if ($firstspace > -1)
1205                                 {
1206                                         $arr [ $firstspace ] = "''";
1207                                         $arr [ $firstspace-1 ] .= "'";
1208                                 }
1209                         }
1210
1211                         # Now let's actually convert our apostrophic mush to HTML!
1212                         $output = '';
1213                         $buffer = '';
1214                         $state = '';
1215                         $i = 0;
1216                         foreach ($arr as $r)
1217                         {
1218                                 if (($i % 2) == 0)
1219                                 {
1220                                         if ($state == 'both')
1221                                                 $buffer .= $r;
1222                                         else
1223                                                 $output .= $r;
1224                                 }
1225                                 else
1226                                 {
1227                                         if (strlen ($r) == 2)
1228                                         {
1229                                                 if ($state == 'i')
1230                                                 { $output .= '</i>'; $state = ''; }
1231                                                 else if ($state == 'bi')
1232                                                 { $output .= '</i>'; $state = 'b'; }
1233                                                 else if ($state == 'ib')
1234                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1235                                                 else if ($state == 'both')
1236                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1237                                                 else # $state can be 'b' or ''
1238                                                 { $output .= '<i>'; $state .= 'i'; }
1239                                         }
1240                                         else if (strlen ($r) == 3)
1241                                         {
1242                                                 if ($state == 'b')
1243                                                 { $output .= '</b>'; $state = ''; }
1244                                                 else if ($state == 'bi')
1245                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1246                                                 else if ($state == 'ib')
1247                                                 { $output .= '</b>'; $state = 'i'; }
1248                                                 else if ($state == 'both')
1249                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1250                                                 else # $state can be 'i' or ''
1251                                                 { $output .= '<b>'; $state .= 'b'; }
1252                                         }
1253                                         else if (strlen ($r) == 5)
1254                                         {
1255                                                 if ($state == 'b')
1256                                                 { $output .= '</b><i>'; $state = 'i'; }
1257                                                 else if ($state == 'i')
1258                                                 { $output .= '</i><b>'; $state = 'b'; }
1259                                                 else if ($state == 'bi')
1260                                                 { $output .= '</i></b>'; $state = ''; }
1261                                                 else if ($state == 'ib')
1262                                                 { $output .= '</b></i>'; $state = ''; }
1263                                                 else if ($state == 'both')
1264                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1265                                                 else # ($state == '')
1266                                                 { $buffer = ''; $state = 'both'; }
1267                                         }
1268                                 }
1269                                 $i++;
1270                         }
1271                         # Now close all remaining tags.  Notice that the order is important.
1272                         if ($state == 'b' || $state == 'ib')
1273                                 $output .= '</b>';
1274                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1275                                 $output .= '</i>';
1276                         if ($state == 'bi')
1277                                 $output .= '</b>';
1278                         if ($state == 'both')
1279                                 $output .= '<b><i>'.$buffer.'</i></b>';
1280                         return $output;
1281                 }
1282         }
1283
1284         /**
1285          * Replace external links
1286          *
1287          * Note: this is all very hackish and the order of execution matters a lot.
1288          * Make sure to run maintenance/parserTests.php if you change this code.
1289          *
1290          * @private
1291          */
1292         function replaceExternalLinks( $text ) {
1293                 global $wgContLang;
1294                 $fname = 'Parser::replaceExternalLinks';
1295                 wfProfileIn( $fname );
1296
1297                 $sk =& $this->mOptions->getSkin();
1298
1299                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1300
1301                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1302
1303                 $i = 0;
1304                 while ( $i<count( $bits ) ) {
1305                         $url = $bits[$i++];
1306                         $protocol = $bits[$i++];
1307                         $text = $bits[$i++];
1308                         $trail = $bits[$i++];
1309
1310                         # The characters '<' and '>' (which were escaped by
1311                         # removeHTMLtags()) should not be included in
1312                         # URLs, per RFC 2396.
1313                         $m2 = array();
1314                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1315                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1316                                 $url = substr($url, 0, $m2[0][1]);
1317                         }
1318
1319                         # If the link text is an image URL, replace it with an <img> tag
1320                         # This happened by accident in the original parser, but some people used it extensively
1321                         $img = $this->maybeMakeExternalImage( $text );
1322                         if ( $img !== false ) {
1323                                 $text = $img;
1324                         }
1325
1326                         $dtrail = '';
1327
1328                         # Set linktype for CSS - if URL==text, link is essentially free
1329                         $linktype = ($text == $url) ? 'free' : 'text';
1330
1331                         # No link text, e.g. [http://domain.tld/some.link]
1332                         if ( $text == '' ) {
1333                                 # Autonumber if allowed. See bug #5918
1334                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1335                                         $text = '[' . ++$this->mAutonumber . ']';
1336                                         $linktype = 'autonumber';
1337                                 } else {
1338                                         # Otherwise just use the URL
1339                                         $text = htmlspecialchars( $url );
1340                                         $linktype = 'free';
1341                                 }
1342                         } else {
1343                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1344                                 # Check for trail
1345                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1346                         }
1347
1348                         $text = $wgContLang->markNoConversion($text);
1349
1350                         $url = Sanitizer::cleanUrl( $url );
1351
1352                         # Process the trail (i.e. everything after this link up until start of the next link),
1353                         # replacing any non-bracketed links
1354                         $trail = $this->replaceFreeExternalLinks( $trail );
1355
1356                         # Use the encoded URL
1357                         # This means that users can paste URLs directly into the text
1358                         # Funny characters like &ouml; aren't valid in URLs anyway
1359                         # This was changed in August 2004
1360                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1361
1362                         # Register link in the output object.
1363                         # Replace unnecessary URL escape codes with the referenced character
1364                         # This prevents spammers from hiding links from the filters
1365                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1366                         $this->mOutput->addExternalLink( $pasteurized );
1367                 }
1368
1369                 wfProfileOut( $fname );
1370                 return $s;
1371         }
1372
1373         /**
1374          * Replace anything that looks like a URL with a link
1375          * @private
1376          */
1377         function replaceFreeExternalLinks( $text ) {
1378                 global $wgContLang;
1379                 $fname = 'Parser::replaceFreeExternalLinks';
1380                 wfProfileIn( $fname );
1381
1382                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1383                 $s = array_shift( $bits );
1384                 $i = 0;
1385
1386                 $sk =& $this->mOptions->getSkin();
1387
1388                 while ( $i < count( $bits ) ){
1389                         $protocol = $bits[$i++];
1390                         $remainder = $bits[$i++];
1391
1392                         $m = array();
1393                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1394                                 # Found some characters after the protocol that look promising
1395                                 $url = $protocol . $m[1];
1396                                 $trail = $m[2];
1397
1398                                 # special case: handle urls as url args:
1399                                 # http://www.example.com/foo?=http://www.example.com/bar
1400                                 if(strlen($trail) == 0 &&
1401                                         isset($bits[$i]) &&
1402                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1403                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1404                                 {
1405                                         # add protocol, arg
1406                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1407                                         $i += 2;
1408                                         $trail = $m[2];
1409                                 }
1410
1411                                 # The characters '<' and '>' (which were escaped by
1412                                 # removeHTMLtags()) should not be included in
1413                                 # URLs, per RFC 2396.
1414                                 $m2 = array();
1415                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1416                                         $trail = substr($url, $m2[0][1]) . $trail;
1417                                         $url = substr($url, 0, $m2[0][1]);
1418                                 }
1419
1420                                 # Move trailing punctuation to $trail
1421                                 $sep = ',;\.:!?';
1422                                 # If there is no left bracket, then consider right brackets fair game too
1423                                 if ( strpos( $url, '(' ) === false ) {
1424                                         $sep .= ')';
1425                                 }
1426
1427                                 $numSepChars = strspn( strrev( $url ), $sep );
1428                                 if ( $numSepChars ) {
1429                                         $trail = substr( $url, -$numSepChars ) . $trail;
1430                                         $url = substr( $url, 0, -$numSepChars );
1431                                 }
1432
1433                                 $url = Sanitizer::cleanUrl( $url );
1434
1435                                 # Is this an external image?
1436                                 $text = $this->maybeMakeExternalImage( $url );
1437                                 if ( $text === false ) {
1438                                         # Not an image, make a link
1439                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1440                                         # Register it in the output object...
1441                                         # Replace unnecessary URL escape codes with their equivalent characters
1442                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1443                                         $this->mOutput->addExternalLink( $pasteurized );
1444                                 }
1445                                 $s .= $text . $trail;
1446                         } else {
1447                                 $s .= $protocol . $remainder;
1448                         }
1449                 }
1450                 wfProfileOut( $fname );
1451                 return $s;
1452         }
1453
1454         /**
1455          * Replace unusual URL escape codes with their equivalent characters
1456          * @param string
1457          * @return string
1458          * @static
1459          * @fixme This can merge genuinely required bits in the path or query string,
1460          *        breaking legit URLs. A proper fix would treat the various parts of
1461          *        the URL differently; as a workaround, just use the output for
1462          *        statistical records, not for actual linking/output.
1463          */
1464         static function replaceUnusualEscapes( $url ) {
1465                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1466                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1467         }
1468
1469         /**
1470          * Callback function used in replaceUnusualEscapes().
1471          * Replaces unusual URL escape codes with their equivalent character
1472          * @static
1473          * @private
1474          */
1475         private static function replaceUnusualEscapesCallback( $matches ) {
1476                 $char = urldecode( $matches[0] );
1477                 $ord = ord( $char );
1478                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1479                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1480                         // No, shouldn't be escaped
1481                         return $char;
1482                 } else {
1483                         // Yes, leave it escaped
1484                         return $matches[0];
1485                 }
1486         }
1487
1488         /**
1489          * make an image if it's allowed, either through the global
1490          * option or through the exception
1491          * @private
1492          */
1493         function maybeMakeExternalImage( $url ) {
1494                 $sk =& $this->mOptions->getSkin();
1495                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1496                 $imagesexception = !empty($imagesfrom);
1497                 $text = false;
1498                 if ( $this->mOptions->getAllowExternalImages()
1499                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1500                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1501                                 # Image found
1502                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1503                         }
1504                 }
1505                 return $text;
1506         }
1507
1508         /**
1509          * Process [[ ]] wikilinks
1510          *
1511          * @private
1512          */
1513         function replaceInternalLinks( $s ) {
1514                 global $wgContLang;
1515                 static $fname = 'Parser::replaceInternalLinks' ;
1516
1517                 wfProfileIn( $fname );
1518
1519                 wfProfileIn( $fname.'-setup' );
1520                 static $tc = FALSE;
1521                 # the % is needed to support urlencoded titles as well
1522                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1523
1524                 $sk =& $this->mOptions->getSkin();
1525
1526                 #split the entire text string on occurences of [[
1527                 $a = explode( '[[', ' ' . $s );
1528                 #get the first element (all text up to first [[), and remove the space we added
1529                 $s = array_shift( $a );
1530                 $s = substr( $s, 1 );
1531
1532                 # Match a link having the form [[namespace:link|alternate]]trail
1533                 static $e1 = FALSE;
1534                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1535                 # Match cases where there is no "]]", which might still be images
1536                 static $e1_img = FALSE;
1537                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1538                 # Match the end of a line for a word that's not followed by whitespace,
1539                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1540                 $e2 = wfMsgForContent( 'linkprefix' );
1541
1542                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1543
1544                 if( is_null( $this->mTitle ) ) {
1545                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1546                 }
1547                 $nottalk = !$this->mTitle->isTalkPage();
1548
1549                 if ( $useLinkPrefixExtension ) {
1550                         $m = array();
1551                         if ( preg_match( $e2, $s, $m ) ) {
1552                                 $first_prefix = $m[2];
1553                         } else {
1554                                 $first_prefix = false;
1555                         }
1556                 } else {
1557                         $prefix = '';
1558                 }
1559
1560                 $selflink = $this->mTitle->getPrefixedText();
1561                 $useSubpages = $this->areSubpagesAllowed();
1562                 wfProfileOut( $fname.'-setup' );
1563
1564                 # Loop for each link
1565                 for ($k = 0; isset( $a[$k] ); $k++) {
1566                         $line = $a[$k];
1567                         if ( $useLinkPrefixExtension ) {
1568                                 wfProfileIn( $fname.'-prefixhandling' );
1569                                 if ( preg_match( $e2, $s, $m ) ) {
1570                                         $prefix = $m[2];
1571                                         $s = $m[1];
1572                                 } else {
1573                                         $prefix='';
1574                                 }
1575                                 # first link
1576                                 if($first_prefix) {
1577                                         $prefix = $first_prefix;
1578                                         $first_prefix = false;
1579                                 }
1580                                 wfProfileOut( $fname.'-prefixhandling' );
1581                         }
1582
1583                         $might_be_img = false;
1584
1585                         wfProfileIn( "$fname-e1" );
1586                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1587                                 $text = $m[2];
1588                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1589                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1590                                 # the real problem is with the $e1 regex
1591                                 # See bug 1300.
1592                                 #
1593                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1594                                 # and no image is in sight. See bug 2095.
1595                                 #
1596                                 if( $text !== '' &&
1597                                         substr( $m[3], 0, 1 ) === ']' &&
1598                                         strpos($text, '[') !== false
1599                                 )
1600                                 {
1601                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1602                                         $m[3] = substr( $m[3], 1 );
1603                                 }
1604                                 # fix up urlencoded title texts
1605                                 if( strpos( $m[1], '%' ) !== false ) {
1606                                         # Should anchors '#' also be rejected?
1607                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1608                                 }
1609                                 $trail = $m[3];
1610                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1611                                 $might_be_img = true;
1612                                 $text = $m[2];
1613                                 if ( strpos( $m[1], '%' ) !== false ) {
1614                                        $m[1] = urldecode($m[1]);
1615                                 }
1616                                 $trail = "";
1617                         } else { # Invalid form; output directly
1618                                 $s .= $prefix . '[[' . $line ;
1619                                 wfProfileOut( "$fname-e1" );
1620                                 continue;
1621                         }
1622                         wfProfileOut( "$fname-e1" );
1623                         wfProfileIn( "$fname-misc" );
1624
1625                         # Don't allow internal links to pages containing
1626                         # PROTO: where PROTO is a valid URL protocol; these
1627                         # should be external links.
1628                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1629                                 $s .= $prefix . '[[' . $line ;
1630                                 continue;
1631                         }
1632
1633                         # Make subpage if necessary
1634                         if( $useSubpages ) {
1635                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1636                         } else {
1637                                 $link = $m[1];
1638                         }
1639
1640                         $noforce = (substr($m[1], 0, 1) != ':');
1641                         if (!$noforce) {
1642                                 # Strip off leading ':'
1643                                 $link = substr($link, 1);
1644                         }
1645
1646                         wfProfileOut( "$fname-misc" );
1647                         wfProfileIn( "$fname-title" );
1648                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1649                         if( !$nt ) {
1650                                 $s .= $prefix . '[[' . $line;
1651                                 wfProfileOut( "$fname-title" );
1652                                 continue;
1653                         }
1654
1655                         $ns = $nt->getNamespace();
1656                         $iw = $nt->getInterWiki();
1657                         wfProfileOut( "$fname-title" );
1658
1659                         if ($might_be_img) { # if this is actually an invalid link
1660                                 wfProfileIn( "$fname-might_be_img" );
1661                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1662                                         $found = false;
1663                                         while (isset ($a[$k+1]) ) {
1664                                                 #look at the next 'line' to see if we can close it there
1665                                                 $spliced = array_splice( $a, $k + 1, 1 );
1666                                                 $next_line = array_shift( $spliced );
1667                                                 $m = explode( ']]', $next_line, 3 );
1668                                                 if ( count( $m ) == 3 ) {
1669                                                         # the first ]] closes the inner link, the second the image
1670                                                         $found = true;
1671                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1672                                                         $trail = $m[2];
1673                                                         break;
1674                                                 } elseif ( count( $m ) == 2 ) {
1675                                                         #if there's exactly one ]] that's fine, we'll keep looking
1676                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1677                                                 } else {
1678                                                         #if $next_line is invalid too, we need look no further
1679                                                         $text .= '[[' . $next_line;
1680                                                         break;
1681                                                 }
1682                                         }
1683                                         if ( !$found ) {
1684                                                 # we couldn't find the end of this imageLink, so output it raw
1685                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1686                                                 $text = $this->replaceInternalLinks($text);
1687                                                 $s .= "{$prefix}[[$link|$text";
1688                                                 # note: no $trail, because without an end, there *is* no trail
1689                                                 wfProfileOut( "$fname-might_be_img" );
1690                                                 continue;
1691                                         }
1692                                 } else { #it's not an image, so output it raw
1693                                         $s .= "{$prefix}[[$link|$text";
1694                                         # note: no $trail, because without an end, there *is* no trail
1695                                         wfProfileOut( "$fname-might_be_img" );
1696                                         continue;
1697                                 }
1698                                 wfProfileOut( "$fname-might_be_img" );
1699                         }
1700
1701                         $wasblank = ( '' == $text );
1702                         if( $wasblank ) $text = $link;
1703
1704                         # Link not escaped by : , create the various objects
1705                         if( $noforce ) {
1706
1707                                 # Interwikis
1708                                 wfProfileIn( "$fname-interwiki" );
1709                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1710                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1711                                         $s = rtrim($s . "\n");
1712                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1713                                         wfProfileOut( "$fname-interwiki" );
1714                                         continue;
1715                                 }
1716                                 wfProfileOut( "$fname-interwiki" );
1717
1718                                 if ( $ns == NS_IMAGE ) {
1719                                         wfProfileIn( "$fname-image" );
1720                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1721                                                 # recursively parse links inside the image caption
1722                                                 # actually, this will parse them in any other parameters, too,
1723                                                 # but it might be hard to fix that, and it doesn't matter ATM
1724                                                 $text = $this->replaceExternalLinks($text);
1725                                                 $text = $this->replaceInternalLinks($text);
1726
1727                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1728                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1729                                                 $this->mOutput->addImage( $nt->getDBkey() );
1730
1731                                                 wfProfileOut( "$fname-image" );
1732                                                 continue;
1733                                         } else {
1734                                                 # We still need to record the image's presence on the page
1735                                                 $this->mOutput->addImage( $nt->getDBkey() );
1736                                         }
1737                                         wfProfileOut( "$fname-image" );
1738
1739                                 }
1740
1741                                 if ( $ns == NS_CATEGORY ) {
1742                                         wfProfileIn( "$fname-category" );
1743                                         $s = rtrim($s . "\n"); # bug 87
1744
1745                                         if ( $wasblank ) {
1746                                                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
1747                                                         $sortkey = $this->mTitle->getText();
1748                                                 } else {
1749                                                         $sortkey = $this->mTitle->getPrefixedText();
1750                                                 }
1751                                         } else {
1752                                                 $sortkey = $text;
1753                                         }
1754                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1755                                         $sortkey = str_replace( "\n", '', $sortkey );
1756                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1757                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1758
1759                                         /**
1760                                          * Strip the whitespace Category links produce, see bug 87
1761                                          * @todo We might want to use trim($tmp, "\n") here.
1762                                          */
1763                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1764
1765                                         wfProfileOut( "$fname-category" );
1766                                         continue;
1767                                 }
1768                         }
1769
1770                         if( ( $nt->getPrefixedText() === $selflink ) &&
1771                             ( $nt->getFragment() === '' ) ) {
1772                                 # Self-links are handled specially; generally de-link and change to bold.
1773                                 $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1774                                 continue;
1775                         }
1776
1777                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1778                         if( $ns == NS_MEDIA ) {
1779                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1780                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1781                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1782                                 $this->mOutput->addImage( $nt->getDBkey() );
1783                                 continue;
1784                         } elseif( $ns == NS_SPECIAL ) {
1785                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1786                                 continue;
1787                         } elseif( $ns == NS_IMAGE ) {
1788                                 $img = new Image( $nt );
1789                                 if( $img->exists() ) {
1790                                         // Force a blue link if the file exists; may be a remote
1791                                         // upload on the shared repository, and we want to see its
1792                                         // auto-generated page.
1793                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1794                                         $this->mOutput->addLink( $nt );
1795                                         continue;
1796                                 }
1797                         }
1798                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1799                 }
1800                 wfProfileOut( $fname );
1801                 return $s;
1802         }
1803
1804         /**
1805          * Make a link placeholder. The text returned can be later resolved to a real link with
1806          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1807          * parsing of interwiki links, and secondly to allow all existence checks and
1808          * article length checks (for stub links) to be bundled into a single query.
1809          *
1810          */
1811         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1812                 wfProfileIn( __METHOD__ );
1813                 if ( ! is_object($nt) ) {
1814                         # Fail gracefully
1815                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1816                 } else {
1817                         # Separate the link trail from the rest of the link
1818                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1819
1820                         if ( $nt->isExternal() ) {
1821                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1822                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1823                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1824                         } else {
1825                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1826                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1827                                 $this->mLinkHolders['queries'][] = $query;
1828                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1829                                 $this->mLinkHolders['titles'][] = $nt;
1830
1831                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1832                         }
1833                 }
1834                 wfProfileOut( __METHOD__ );
1835                 return $retVal;
1836         }
1837
1838         /**
1839          * Render a forced-blue link inline; protect against double expansion of
1840          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1841          * Since this little disaster has to split off the trail text to avoid
1842          * breaking URLs in the following text without breaking trails on the
1843          * wiki links, it's been made into a horrible function.
1844          *
1845          * @param Title $nt
1846          * @param string $text
1847          * @param string $query
1848          * @param string $trail
1849          * @param string $prefix
1850          * @return string HTML-wikitext mix oh yuck
1851          */
1852         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1853                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1854                 $sk =& $this->mOptions->getSkin();
1855                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1856                 return $this->armorLinks( $link ) . $trail;
1857         }
1858
1859         /**
1860          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1861          * going to go through further parsing steps before inline URL expansion.
1862          *
1863          * In particular this is important when using action=render, which causes
1864          * full URLs to be included.
1865          *
1866          * Oh man I hate our multi-layer parser!
1867          *
1868          * @param string more-or-less HTML
1869          * @return string less-or-more HTML with NOPARSE bits
1870          */
1871         function armorLinks( $text ) {
1872                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1873                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1874         }
1875
1876         /**
1877          * Return true if subpage links should be expanded on this page.
1878          * @return bool
1879          */
1880         function areSubpagesAllowed() {
1881                 # Some namespaces don't allow subpages
1882                 global $wgNamespacesWithSubpages;
1883                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1884         }
1885
1886         /**
1887          * Handle link to subpage if necessary
1888          * @param string $target the source of the link
1889          * @param string &$text the link text, modified as necessary
1890          * @return string the full name of the link
1891          * @private
1892          */
1893         function maybeDoSubpageLink($target, &$text) {
1894                 # Valid link forms:
1895                 # Foobar -- normal
1896                 # :Foobar -- override special treatment of prefix (images, language links)
1897                 # /Foobar -- convert to CurrentPage/Foobar
1898                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1899                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1900                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1901
1902                 $fname = 'Parser::maybeDoSubpageLink';
1903                 wfProfileIn( $fname );
1904                 $ret = $target; # default return value is no change
1905
1906                 # bug 7425
1907                 $target = trim( $target );
1908
1909                 # Some namespaces don't allow subpages,
1910                 # so only perform processing if subpages are allowed
1911                 if( $this->areSubpagesAllowed() ) {
1912                         # Look at the first character
1913                         if( $target != '' && $target{0} == '/' ) {
1914                                 # / at end means we don't want the slash to be shown
1915                                 if( substr( $target, -1, 1 ) == '/' ) {
1916                                         $target = substr( $target, 1, -1 );
1917                                         $noslash = $target;
1918                                 } else {
1919                                         $noslash = substr( $target, 1 );
1920                                 }
1921
1922                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1923                                 if( '' === $text ) {
1924                                         $text = $target;
1925                                 } # this might be changed for ugliness reasons
1926                         } else {
1927                                 # check for .. subpage backlinks
1928                                 $dotdotcount = 0;
1929                                 $nodotdot = $target;
1930                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1931                                         ++$dotdotcount;
1932                                         $nodotdot = substr( $nodotdot, 3 );
1933                                 }
1934                                 if($dotdotcount > 0) {
1935                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1936                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1937                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1938                                                 # / at the end means don't show full path
1939                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1940                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1941                                                         if( '' === $text ) {
1942                                                                 $text = $nodotdot;
1943                                                         }
1944                                                 }
1945                                                 $nodotdot = trim( $nodotdot );
1946                                                 if( $nodotdot != '' ) {
1947                                                         $ret .= '/' . $nodotdot;
1948                                                 }
1949                                         }
1950                                 }
1951                         }
1952                 }
1953
1954                 wfProfileOut( $fname );
1955                 return $ret;
1956         }
1957
1958         /**#@+
1959          * Used by doBlockLevels()
1960          * @private
1961          */
1962         /* private */ function closeParagraph() {
1963                 $result = '';
1964                 if ( '' != $this->mLastSection ) {
1965                         $result = '</' . $this->mLastSection  . ">\n";
1966                 }
1967                 $this->mInPre = false;
1968                 $this->mLastSection = '';
1969                 return $result;
1970         }
1971         # getCommon() returns the length of the longest common substring
1972         # of both arguments, starting at the beginning of both.
1973         #
1974         /* private */ function getCommon( $st1, $st2 ) {
1975                 $fl = strlen( $st1 );
1976                 $shorter = strlen( $st2 );
1977                 if ( $fl < $shorter ) { $shorter = $fl; }
1978
1979                 for ( $i = 0; $i < $shorter; ++$i ) {
1980                         if ( $st1{$i} != $st2{$i} ) { break; }
1981                 }
1982                 return $i;
1983         }
1984         # These next three functions open, continue, and close the list
1985         # element appropriate to the prefix character passed into them.
1986         #
1987         /* private */ function openList( $char ) {
1988                 $result = $this->closeParagraph();
1989
1990                 if ( '*' == $char ) { $result .= '<ul><li>'; }
1991                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
1992                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
1993                 else if ( ';' == $char ) {
1994                         $result .= '<dl><dt>';
1995                         $this->mDTopen = true;
1996                 }
1997                 else { $result = '<!-- ERR 1 -->'; }
1998
1999                 return $result;
2000         }
2001
2002         /* private */ function nextItem( $char ) {
2003                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2004                 else if ( ':' == $char || ';' == $char ) {
2005                         $close = '</dd>';
2006                         if ( $this->mDTopen ) { $close = '</dt>'; }
2007                         if ( ';' == $char ) {
2008                                 $this->mDTopen = true;
2009                                 return $close . '<dt>';
2010                         } else {
2011                                 $this->mDTopen = false;
2012                                 return $close . '<dd>';
2013                         }
2014                 }
2015                 return '<!-- ERR 2 -->';
2016         }
2017
2018         /* private */ function closeList( $char ) {
2019                 if ( '*' == $char ) { $text = '</li></ul>'; }
2020                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2021                 else if ( ':' == $char ) {
2022                         if ( $this->mDTopen ) {
2023                                 $this->mDTopen = false;
2024                                 $text = '</dt></dl>';
2025                         } else {
2026                                 $text = '</dd></dl>';
2027                         }
2028                 }
2029                 else {  return '<!-- ERR 3 -->'; }
2030                 return $text."\n";
2031         }
2032         /**#@-*/
2033
2034         /**
2035          * Make lists from lines starting with ':', '*', '#', etc.
2036          *
2037          * @private
2038          * @return string the lists rendered as HTML
2039          */
2040         function doBlockLevels( $text, $linestart ) {
2041                 $fname = 'Parser::doBlockLevels';
2042                 wfProfileIn( $fname );
2043
2044                 # Parsing through the text line by line.  The main thing
2045                 # happening here is handling of block-level elements p, pre,
2046                 # and making lists from lines starting with * # : etc.
2047                 #
2048                 $textLines = explode( "\n", $text );
2049
2050                 $lastPrefix = $output = '';
2051                 $this->mDTopen = $inBlockElem = false;
2052                 $prefixLength = 0;
2053                 $paragraphStack = false;
2054
2055                 if ( !$linestart ) {
2056                         $output .= array_shift( $textLines );
2057                 }
2058                 foreach ( $textLines as $oLine ) {
2059                         $lastPrefixLength = strlen( $lastPrefix );
2060                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2061                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2062                         if ( !$this->mInPre ) {
2063                                 # Multiple prefixes may abut each other for nested lists.
2064                                 $prefixLength = strspn( $oLine, '*#:;' );
2065                                 $pref = substr( $oLine, 0, $prefixLength );
2066
2067                                 # eh?
2068                                 $pref2 = str_replace( ';', ':', $pref );
2069                                 $t = substr( $oLine, $prefixLength );
2070                                 $this->mInPre = !empty($preOpenMatch);
2071                         } else {
2072                                 # Don't interpret any other prefixes in preformatted text
2073                                 $prefixLength = 0;
2074                                 $pref = $pref2 = '';
2075                                 $t = $oLine;
2076                         }
2077
2078                         # List generation
2079                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2080                                 # Same as the last item, so no need to deal with nesting or opening stuff
2081                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2082                                 $paragraphStack = false;
2083
2084                                 if ( substr( $pref, -1 ) == ';') {
2085                                         # The one nasty exception: definition lists work like this:
2086                                         # ; title : definition text
2087                                         # So we check for : in the remainder text to split up the
2088                                         # title and definition, without b0rking links.
2089                                         $term = $t2 = '';
2090                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2091                                                 $t = $t2;
2092                                                 $output .= $term . $this->nextItem( ':' );
2093                                         }
2094                                 }
2095                         } elseif( $prefixLength || $lastPrefixLength ) {
2096                                 # Either open or close a level...
2097                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2098                                 $paragraphStack = false;
2099
2100                                 while( $commonPrefixLength < $lastPrefixLength ) {
2101                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2102                                         --$lastPrefixLength;
2103                                 }
2104                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2105                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2106                                 }
2107                                 while ( $prefixLength > $commonPrefixLength ) {
2108                                         $char = substr( $pref, $commonPrefixLength, 1 );
2109                                         $output .= $this->openList( $char );
2110
2111                                         if ( ';' == $char ) {
2112                                                 # FIXME: This is dupe of code above
2113                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2114                                                         $t = $t2;
2115                                                         $output .= $term . $this->nextItem( ':' );
2116                                                 }
2117                                         }
2118                                         ++$commonPrefixLength;
2119                                 }
2120                                 $lastPrefix = $pref2;
2121                         }
2122                         if( 0 == $prefixLength ) {
2123                                 wfProfileIn( "$fname-paragraph" );
2124                                 # No prefix (not in list)--go to paragraph mode
2125                                 // XXX: use a stack for nestable elements like span, table and div
2126                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/center|<\\/tr|<\\/td|<\\/th)/iS', $t );
2127                                 $closematch = preg_match(
2128                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2129                                         '<td|<th|<div|<\\/div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<center)/iS', $t );
2130                                 if ( $openmatch or $closematch ) {
2131                                         $paragraphStack = false;
2132                                         # TODO bug 5718: paragraph closed
2133                                         $output .= $this->closeParagraph();
2134                                         if ( $preOpenMatch and !$preCloseMatch ) {
2135                                                 $this->mInPre = true;
2136                                         }
2137                                         if ( $closematch ) {
2138                                                 $inBlockElem = false;
2139                                         } else {
2140                                                 $inBlockElem = true;
2141                                         }
2142                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2143                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2144                                                 // pre
2145                                                 if ($this->mLastSection != 'pre') {
2146                                                         $paragraphStack = false;
2147                                                         $output .= $this->closeParagraph().'<pre>';
2148                                                         $this->mLastSection = 'pre';
2149                                                 }
2150                                                 $t = substr( $t, 1 );
2151                                         } else {
2152                                                 // paragraph
2153                                                 if ( '' == trim($t) ) {
2154                                                         if ( $paragraphStack ) {
2155                                                                 $output .= $paragraphStack.'<br />';
2156                                                                 $paragraphStack = false;
2157                                                                 $this->mLastSection = 'p';
2158                                                         } else {
2159                                                                 if ($this->mLastSection != 'p' ) {
2160                                                                         $output .= $this->closeParagraph();
2161                                                                         $this->mLastSection = '';
2162                                                                         $paragraphStack = '<p>';
2163                                                                 } else {
2164                                                                         $paragraphStack = '</p><p>';
2165                                                                 }
2166                                                         }
2167                                                 } else {
2168                                                         if ( $paragraphStack ) {
2169                                                                 $output .= $paragraphStack;
2170                                                                 $paragraphStack = false;
2171                                                                 $this->mLastSection = 'p';
2172                                                         } else if ($this->mLastSection != 'p') {
2173                                                                 $output .= $this->closeParagraph().'<p>';
2174                                                                 $this->mLastSection = 'p';
2175                                                         }
2176                                                 }
2177                                         }
2178                                 }
2179                                 wfProfileOut( "$fname-paragraph" );
2180                         }
2181                         // somewhere above we forget to get out of pre block (bug 785)
2182                         if($preCloseMatch && $this->mInPre) {
2183                                 $this->mInPre = false;
2184                         }
2185                         if ($paragraphStack === false) {
2186                                 $output .= $t."\n";
2187                         }
2188                 }
2189                 while ( $prefixLength ) {
2190                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2191                         --$prefixLength;
2192                 }
2193                 if ( '' != $this->mLastSection ) {
2194                         $output .= '</' . $this->mLastSection . '>';
2195                         $this->mLastSection = '';
2196                 }
2197
2198                 wfProfileOut( $fname );
2199                 return $output;
2200         }
2201
2202         /**
2203          * Split up a string on ':', ignoring any occurences inside tags
2204          * to prevent illegal overlapping.
2205          * @param string $str the string to split
2206          * @param string &$before set to everything before the ':'
2207          * @param string &$after set to everything after the ':'
2208          * return string the position of the ':', or false if none found
2209          */
2210         function findColonNoLinks($str, &$before, &$after) {
2211                 $fname = 'Parser::findColonNoLinks';
2212                 wfProfileIn( $fname );
2213
2214                 $pos = strpos( $str, ':' );
2215                 if( $pos === false ) {
2216                         // Nothing to find!
2217                         wfProfileOut( $fname );
2218                         return false;
2219                 }
2220
2221                 $lt = strpos( $str, '<' );
2222                 if( $lt === false || $lt > $pos ) {
2223                         // Easy; no tag nesting to worry about
2224                         $before = substr( $str, 0, $pos );
2225                         $after = substr( $str, $pos+1 );
2226                         wfProfileOut( $fname );
2227                         return $pos;
2228                 }
2229
2230                 // Ugly state machine to walk through avoiding tags.
2231                 $state = MW_COLON_STATE_TEXT;
2232                 $stack = 0;
2233                 $len = strlen( $str );
2234                 for( $i = 0; $i < $len; $i++ ) {
2235                         $c = $str{$i};
2236
2237                         switch( $state ) {
2238                         // (Using the number is a performance hack for common cases)
2239                         case 0: // MW_COLON_STATE_TEXT:
2240                                 switch( $c ) {
2241                                 case "<":
2242                                         // Could be either a <start> tag or an </end> tag
2243                                         $state = MW_COLON_STATE_TAGSTART;
2244                                         break;
2245                                 case ":":
2246                                         if( $stack == 0 ) {
2247                                                 // We found it!
2248                                                 $before = substr( $str, 0, $i );
2249                                                 $after = substr( $str, $i + 1 );
2250                                                 wfProfileOut( $fname );
2251                                                 return $i;
2252                                         }
2253                                         // Embedded in a tag; don't break it.
2254                                         break;
2255                                 default:
2256                                         // Skip ahead looking for something interesting
2257                                         $colon = strpos( $str, ':', $i );
2258                                         if( $colon === false ) {
2259                                                 // Nothing else interesting
2260                                                 wfProfileOut( $fname );
2261                                                 return false;
2262                                         }
2263                                         $lt = strpos( $str, '<', $i );
2264                                         if( $stack === 0 ) {
2265                                                 if( $lt === false || $colon < $lt ) {
2266                                                         // We found it!
2267                                                         $before = substr( $str, 0, $colon );
2268                                                         $after = substr( $str, $colon + 1 );
2269                                                         wfProfileOut( $fname );
2270                                                         return $i;
2271                                                 }
2272                                         }
2273                                         if( $lt === false ) {
2274                                                 // Nothing else interesting to find; abort!
2275                                                 // We're nested, but there's no close tags left. Abort!
2276                                                 break 2;
2277                                         }
2278                                         // Skip ahead to next tag start
2279                                         $i = $lt;
2280                                         $state = MW_COLON_STATE_TAGSTART;
2281                                 }
2282                                 break;
2283                         case 1: // MW_COLON_STATE_TAG:
2284                                 // In a <tag>
2285                                 switch( $c ) {
2286                                 case ">":
2287                                         $stack++;
2288                                         $state = MW_COLON_STATE_TEXT;
2289                                         break;
2290                                 case "/":
2291                                         // Slash may be followed by >?
2292                                         $state = MW_COLON_STATE_TAGSLASH;
2293                                         break;
2294                                 default:
2295                                         // ignore
2296                                 }
2297                                 break;
2298                         case 2: // MW_COLON_STATE_TAGSTART:
2299                                 switch( $c ) {
2300                                 case "/":
2301                                         $state = MW_COLON_STATE_CLOSETAG;
2302                                         break;
2303                                 case "!":
2304                                         $state = MW_COLON_STATE_COMMENT;
2305                                         break;
2306                                 case ">":
2307                                         // Illegal early close? This shouldn't happen D:
2308                                         $state = MW_COLON_STATE_TEXT;
2309                                         break;
2310                                 default:
2311                                         $state = MW_COLON_STATE_TAG;
2312                                 }
2313                                 break;
2314                         case 3: // MW_COLON_STATE_CLOSETAG:
2315                                 // In a </tag>
2316                                 if( $c == ">" ) {
2317                                         $stack--;
2318                                         if( $stack < 0 ) {
2319                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2320                                                 wfProfileOut( $fname );
2321                                                 return false;
2322                                         }
2323                                         $state = MW_COLON_STATE_TEXT;
2324                                 }
2325                                 break;
2326                         case MW_COLON_STATE_TAGSLASH:
2327                                 if( $c == ">" ) {
2328                                         // Yes, a self-closed tag <blah/>
2329                                         $state = MW_COLON_STATE_TEXT;
2330                                 } else {
2331                                         // Probably we're jumping the gun, and this is an attribute
2332                                         $state = MW_COLON_STATE_TAG;
2333                                 }
2334                                 break;
2335                         case 5: // MW_COLON_STATE_COMMENT:
2336                                 if( $c == "-" ) {
2337                                         $state = MW_COLON_STATE_COMMENTDASH;
2338                                 }
2339                                 break;
2340                         case MW_COLON_STATE_COMMENTDASH:
2341                                 if( $c == "-" ) {
2342                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2343                                 } else {
2344                                         $state = MW_COLON_STATE_COMMENT;
2345                                 }
2346                                 break;
2347                         case MW_COLON_STATE_COMMENTDASHDASH:
2348                                 if( $c == ">" ) {
2349                                         $state = MW_COLON_STATE_TEXT;
2350                                 } else {
2351                                         $state = MW_COLON_STATE_COMMENT;
2352                                 }
2353                                 break;
2354                         default:
2355                                 throw new MWException( "State machine error in $fname" );
2356                         }
2357                 }
2358                 if( $stack > 0 ) {
2359                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2360                         return false;
2361                 }
2362                 wfProfileOut( $fname );
2363                 return false;
2364         }
2365
2366         /**
2367          * Return value of a magic variable (like PAGENAME)
2368          *
2369          * @private
2370          */
2371         function getVariableValue( $index ) {
2372                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2373
2374                 /**
2375                  * Some of these require message or data lookups and can be
2376                  * expensive to check many times.
2377                  */
2378                 static $varCache = array();
2379                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2380                         if ( isset( $varCache[$index] ) ) {
2381                                 return $varCache[$index];
2382                         }
2383                 }
2384
2385                 $ts = time();
2386                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2387
2388                 # Use the time zone
2389                 global $wgLocaltimezone;
2390                 if ( isset( $wgLocaltimezone ) ) {
2391                         $oldtz = getenv( 'TZ' );
2392                         putenv( 'TZ='.$wgLocaltimezone );
2393                 }
2394                 $localTimestamp = date( 'YmdHis', $ts );
2395                 $localMonth = date( 'm', $ts );
2396                 $localMonthName = date( 'n', $ts );
2397                 $localDay = date( 'j', $ts );
2398                 $localDay2 = date( 'd', $ts );
2399                 $localDayOfWeek = date( 'w', $ts );
2400                 $localWeek = date( 'W', $ts );
2401                 $localYear = date( 'Y', $ts );
2402                 $localHour = date( 'H', $ts );
2403                 if ( isset( $wgLocaltimezone ) ) {
2404                         putenv( 'TZ='.$oldtz );
2405                 }
2406
2407                 switch ( $index ) {
2408                         case 'currentmonth':
2409                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2410                         case 'currentmonthname':
2411                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2412                         case 'currentmonthnamegen':
2413                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2414                         case 'currentmonthabbrev':
2415                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2416                         case 'currentday':
2417                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2418                         case 'currentday2':
2419                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2420                         case 'localmonth':
2421                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2422                         case 'localmonthname':
2423                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2424                         case 'localmonthnamegen':
2425                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2426                         case 'localmonthabbrev':
2427                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2428                         case 'localday':
2429                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2430                         case 'localday2':
2431                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2432                         case 'pagename':
2433                                 return $this->mTitle->getText();
2434                         case 'pagenamee':
2435                                 return $this->mTitle->getPartialURL();
2436                         case 'fullpagename':
2437                                 return $this->mTitle->getPrefixedText();
2438                         case 'fullpagenamee':
2439                                 return $this->mTitle->getPrefixedURL();
2440                         case 'subpagename':
2441                                 return $this->mTitle->getSubpageText();
2442                         case 'subpagenamee':
2443                                 return $this->mTitle->getSubpageUrlForm();
2444                         case 'basepagename':
2445                                 return $this->mTitle->getBaseText();
2446                         case 'basepagenamee':
2447                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2448                         case 'talkpagename':
2449                                 if( $this->mTitle->canTalk() ) {
2450                                         $talkPage = $this->mTitle->getTalkPage();
2451                                         return $talkPage->getPrefixedText();
2452                                 } else {
2453                                         return '';
2454                                 }
2455                         case 'talkpagenamee':
2456                                 if( $this->mTitle->canTalk() ) {
2457                                         $talkPage = $this->mTitle->getTalkPage();
2458                                         return $talkPage->getPrefixedUrl();
2459                                 } else {
2460                                         return '';
2461                                 }
2462                         case 'subjectpagename':
2463                                 $subjPage = $this->mTitle->getSubjectPage();
2464                                 return $subjPage->getPrefixedText();
2465                         case 'subjectpagenamee':
2466                                 $subjPage = $this->mTitle->getSubjectPage();
2467                                 return $subjPage->getPrefixedUrl();
2468                         case 'revisionid':
2469                                 return $this->mRevisionId;
2470                         case 'revisionday':
2471                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2472                         case 'revisionday2':
2473                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2474                         case 'revisionmonth':
2475                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2476                         case 'revisionyear':
2477                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2478                         case 'revisiontimestamp':
2479                                 return $this->getRevisionTimestamp();
2480                         case 'namespace':
2481                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2482                         case 'namespacee':
2483                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2484                         case 'talkspace':
2485                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2486                         case 'talkspacee':
2487                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2488                         case 'subjectspace':
2489                                 return $this->mTitle->getSubjectNsText();
2490                         case 'subjectspacee':
2491                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2492                         case 'currentdayname':
2493                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2494                         case 'currentyear':
2495                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2496                         case 'currenttime':
2497                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2498                         case 'currenthour':
2499                                 return $varCache[$index] = $wgContLang->formatNum( date( 'H', $ts ), true );
2500                         case 'currentweek':
2501                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2502                                 // int to remove the padding
2503                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2504                         case 'currentdow':
2505                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2506                         case 'localdayname':
2507                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2508                         case 'localyear':
2509                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2510                         case 'localtime':
2511                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2512                         case 'localhour':
2513                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2514                         case 'localweek':
2515                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2516                                 // int to remove the padding
2517                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2518                         case 'localdow':
2519                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2520                         case 'numberofarticles':
2521                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2522                         case 'numberoffiles':
2523                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2524                         case 'numberofusers':
2525                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2526                         case 'numberofpages':
2527                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2528                         case 'numberofadmins':
2529                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2530                         case 'currenttimestamp':
2531                                 return $varCache[$index] = wfTimestampNow();
2532                         case 'localtimestamp':
2533                                 return $varCache[$index] = $localTimestamp;
2534                         case 'currentversion':
2535                                 return $varCache[$index] = SpecialVersion::getVersion();
2536                         case 'sitename':
2537                                 return $wgSitename;
2538                         case 'server':
2539                                 return $wgServer;
2540                         case 'servername':
2541                                 return $wgServerName;
2542                         case 'scriptpath':
2543                                 return $wgScriptPath;
2544                         case 'directionmark':
2545                                 return $wgContLang->getDirMark();
2546                         case 'contentlanguage':
2547                                 global $wgContLanguageCode;
2548                                 return $wgContLanguageCode;
2549                         default:
2550                                 $ret = null;
2551                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2552                                         return $ret;
2553                                 else
2554                                         return null;
2555                 }
2556         }
2557
2558         /**
2559          * initialise the magic variables (like CURRENTMONTHNAME)
2560          *
2561          * @private
2562          */
2563         function initialiseVariables() {
2564                 $fname = 'Parser::initialiseVariables';
2565                 wfProfileIn( $fname );
2566                 $variableIDs = MagicWord::getVariableIDs();
2567
2568                 $this->mVariables = array();
2569                 foreach ( $variableIDs as $id ) {
2570                         $mw =& MagicWord::get( $id );
2571                         $mw->addToArray( $this->mVariables, $id );
2572                 }
2573                 wfProfileOut( $fname );
2574         }
2575
2576         /**
2577          * parse any parentheses in format ((title|part|part))
2578          * and call callbacks to get a replacement text for any found piece
2579          *
2580          * @param string $text The text to parse
2581          * @param array $callbacks rules in form:
2582          *     '{' => array(                            # opening parentheses
2583          *                                      'end' => '}',   # closing parentheses
2584          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2585          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2586          *                                                                )
2587          *                                      )
2588          *                                      'min' => 2,     # Minimum parenthesis count in cb
2589          *                                      'max' => 3,     # Maximum parenthesis count in cb
2590          * @private
2591          */
2592         function replace_callback ($text, $callbacks) {
2593                 wfProfileIn( __METHOD__ );
2594                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2595                 $lastOpeningBrace = -1;                 # last not closed parentheses
2596
2597                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2598
2599                 $i = 0;
2600                 while ( $i < strlen( $text ) ) {
2601                         # Find next opening brace, closing brace or pipe
2602                         if ( $lastOpeningBrace == -1 ) {
2603                                 $currentClosing = '';
2604                                 $search = $validOpeningBraces;
2605                         } else {
2606                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2607                                 $search = $validOpeningBraces . '|' . $currentClosing;
2608                         }
2609                         $rule = null;
2610                         $i += strcspn( $text, $search, $i );
2611                         if ( $i < strlen( $text ) ) {
2612                                 if ( $text[$i] == '|' ) {
2613                                         $found = 'pipe';
2614                                 } elseif ( $text[$i] == $currentClosing ) {
2615                                         $found = 'close';
2616                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2617                                         $found = 'open';
2618                                         $rule = $callbacks[$text[$i]];
2619                                 } else {
2620                                         # Some versions of PHP have a strcspn which stops on null characters
2621                                         # Ignore and continue
2622                                         ++$i;
2623                                         continue;
2624                                 }
2625                         } else {
2626                                 # All done
2627                                 break;
2628                         }
2629
2630                         if ( $found == 'open' ) {
2631                                 # found opening brace, let's add it to parentheses stack
2632                                 $piece = array('brace' => $text[$i],
2633                                                            'braceEnd' => $rule['end'],
2634                                                            'title' => '',
2635                                                            'parts' => null);
2636
2637                                 # count opening brace characters
2638                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2639                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2640                                 $i += $piece['count'];
2641
2642                                 # we need to add to stack only if opening brace count is enough for one of the rules
2643                                 if ( $piece['count'] >= $rule['min'] ) {
2644                                         $lastOpeningBrace ++;
2645                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2646                                 }
2647                         } elseif ( $found == 'close' ) {
2648                                 # lets check if it is enough characters for closing brace
2649                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2650                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2651
2652                                 # check for maximum matching characters (if there are 5 closing
2653                                 # characters, we will probably need only 3 - depending on the rules)
2654                                 $matchingCount = 0;
2655                                 $matchingCallback = null;
2656                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2657                                 if ( $count > $cbType['max'] ) {
2658                                         # The specified maximum exists in the callback array, unless the caller
2659                                         # has made an error
2660                                         $matchingCount = $cbType['max'];
2661                                 } else {
2662                                         # Count is less than the maximum
2663                                         # Skip any gaps in the callback array to find the true largest match
2664                                         # Need to use array_key_exists not isset because the callback can be null
2665                                         $matchingCount = $count;
2666                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2667                                                 --$matchingCount;
2668                                         }
2669                                 }
2670
2671                                 if ($matchingCount <= 0) {
2672                                         $i += $count;
2673                                         continue;
2674                                 }
2675                                 $matchingCallback = $cbType['cb'][$matchingCount];
2676
2677                                 # let's set a title or last part (if '|' was found)
2678                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2679                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2680                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2681                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2682                                 } else {
2683                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2684                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2685                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2686                                 }
2687
2688                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2689                                 $pieceEnd = $i + $matchingCount;
2690
2691                                 if( is_callable( $matchingCallback ) ) {
2692                                         $cbArgs = array (
2693                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2694                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2695                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2696                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2697                                                                          );
2698                                         # finally we can call a user callback and replace piece of text
2699                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2700                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2701                                         $i = $pieceStart + strlen($replaceWith);
2702                                 } else {
2703                                         # null value for callback means that parentheses should be parsed, but not replaced
2704                                         $i += $matchingCount;
2705                                 }
2706
2707                                 # reset last opening parentheses, but keep it in case there are unused characters
2708                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2709                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2710                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2711                                                            'title' => '',
2712                                                            'parts' => null,
2713                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2714                                 $openingBraceStack[$lastOpeningBrace--] = null;
2715
2716                                 if ($matchingCount < $piece['count']) {
2717                                         $piece['count'] -= $matchingCount;
2718                                         $piece['startAt'] -= $matchingCount;
2719                                         $piece['partStart'] = $piece['startAt'];
2720                                         # do we still qualify for any callback with remaining count?
2721                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2722                                         while ( $piece['count'] ) {
2723                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2724                                                         $lastOpeningBrace++;
2725                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2726                                                         break;
2727                                                 }
2728                                                 --$piece['count'];
2729                                         }
2730                                 }
2731                         } elseif ( $found == 'pipe' ) {
2732                                 # lets set a title if it is a first separator, or next part otherwise
2733                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2734                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2735                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2736                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2737                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2738                                 } else {
2739                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2740                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2741                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2742                                 }
2743                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2744                         }
2745                 }
2746
2747                 wfProfileOut( __METHOD__ );
2748                 return $text;
2749         }
2750
2751         /**
2752          * Replace magic variables, templates, and template arguments
2753          * with the appropriate text. Templates are substituted recursively,
2754          * taking care to avoid infinite loops.
2755          *
2756          * Note that the substitution depends on value of $mOutputType:
2757          *  OT_WIKI: only {{subst:}} templates
2758          *  OT_MSG: only magic variables
2759          *  OT_HTML: all templates and magic variables
2760          *
2761          * @param string $tex The text to transform
2762          * @param array $args Key-value pairs representing template parameters to substitute
2763          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2764          * @private
2765          */
2766         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2767                 # Prevent too big inclusions
2768                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2769                         return $text;
2770                 }
2771
2772                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2773                 wfProfileIn( $fname );
2774
2775                 # This function is called recursively. To keep track of arguments we need a stack:
2776                 array_push( $this->mArgStack, $args );
2777
2778                 $braceCallbacks = array();
2779                 if ( !$argsOnly ) {
2780                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2781                 }
2782                 if ( $this->mOutputType != OT_MSG ) {
2783                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2784                 }
2785                 if ( $braceCallbacks ) {
2786                         $callbacks = array(
2787                                 '{' => array(
2788                                         'end' => '}',
2789                                         'cb' => $braceCallbacks,
2790                                         'min' => $argsOnly ? 3 : 2,
2791                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2792                                 ),
2793                                 '[' => array(
2794                                         'end' => ']',
2795                                         'cb' => array(2=>null),
2796                                         'min' => 2,
2797                                         'max' => 2,
2798                                 )
2799                         );
2800                         $text = $this->replace_callback ($text, $callbacks);
2801
2802                         array_pop( $this->mArgStack );
2803                 }
2804                 wfProfileOut( $fname );
2805                 return $text;
2806         }
2807
2808         /**
2809          * Replace magic variables
2810          * @private
2811          */
2812         function variableSubstitution( $matches ) {
2813                 global $wgContLang;
2814                 $fname = 'Parser::variableSubstitution';
2815                 $varname = $wgContLang->lc($matches[1]);
2816                 wfProfileIn( $fname );
2817                 $skip = false;
2818                 if ( $this->mOutputType == OT_WIKI ) {
2819                         # Do only magic variables prefixed by SUBST
2820                         $mwSubst =& MagicWord::get( 'subst' );
2821                         if (!$mwSubst->matchStartAndRemove( $varname ))
2822                                 $skip = true;
2823                         # Note that if we don't substitute the variable below,
2824                         # we don't remove the {{subst:}} magic word, in case
2825                         # it is a template rather than a magic variable.
2826                 }
2827                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2828                         $id = $this->mVariables[$varname];
2829                         # Now check if we did really match, case sensitive or not
2830                         $mw =& MagicWord::get( $id );
2831                         if ($mw->match($matches[1])) {
2832                                 $text = $this->getVariableValue( $id );
2833                                 $this->mOutput->mContainsOldMagic = true;
2834                         } else {
2835                                 $text = $matches[0];
2836                         }
2837                 } else {
2838                         $text = $matches[0];
2839                 }
2840                 wfProfileOut( $fname );
2841                 return $text;
2842         }
2843
2844         /**
2845          * Return the text of a template, after recursively
2846          * replacing any variables or templates within the template.
2847          *
2848          * @param array $piece The parts of the template
2849          *  $piece['text']: matched text
2850          *  $piece['title']: the title, i.e. the part before the |
2851          *  $piece['parts']: the parameter array
2852          * @return string the text of the template
2853          * @private
2854          */
2855         function braceSubstitution( $piece ) {
2856                 global $wgContLang, $wgLang, $wgAllowDisplayTitle;
2857                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2858                 wfProfileIn( $fname );
2859                 wfProfileIn( __METHOD__.'-setup' );
2860
2861                 # Flags
2862                 $found = false;             # $text has been filled
2863                 $nowiki = false;            # wiki markup in $text should be escaped
2864                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2865                 $noargs = false;            # Don't replace triple-brace arguments in $text
2866                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2867                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2868                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2869                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2870
2871                 # Title object, where $text came from
2872                 $title = NULL;
2873
2874                 $linestart = '';
2875
2876
2877                 # $part1 is the bit before the first |, and must contain only title characters
2878                 # $args is a list of arguments, starting from index 0, not including $part1
2879
2880                 $titleText = $part1 = $piece['title'];
2881                 # If the third subpattern matched anything, it will start with |
2882
2883                 if (null == $piece['parts']) {
2884                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2885                         if ($replaceWith != $piece['text']) {
2886                                 $text = $replaceWith;
2887                                 $found = true;
2888                                 $noparse = true;
2889                                 $noargs = true;
2890                         }
2891                 }
2892
2893                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2894                 wfProfileOut( __METHOD__.'-setup' );
2895
2896                 # SUBST
2897                 wfProfileIn( __METHOD__.'-modifiers' );
2898                 if ( !$found ) {
2899                         $mwSubst =& MagicWord::get( 'subst' );
2900                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2901                                 # One of two possibilities is true:
2902                                 # 1) Found SUBST but not in the PST phase
2903                                 # 2) Didn't find SUBST and in the PST phase
2904                                 # In either case, return without further processing
2905                                 $text = $piece['text'];
2906                                 $found = true;
2907                                 $noparse = true;
2908                                 $noargs = true;
2909                         }
2910                 }
2911
2912                 # MSG, MSGNW and RAW
2913                 if ( !$found ) {
2914                         # Check for MSGNW:
2915                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2916                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2917                                 $nowiki = true;
2918                         } else {
2919                                 # Remove obsolete MSG:
2920                                 $mwMsg =& MagicWord::get( 'msg' );
2921                                 $mwMsg->matchStartAndRemove( $part1 );
2922                         }
2923
2924                         # Check for RAW:
2925                         $mwRaw =& MagicWord::get( 'raw' );
2926                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2927                                 $forceRawInterwiki = true;
2928                         }
2929                 }
2930                 wfProfileOut( __METHOD__.'-modifiers' );
2931
2932                 # Parser functions
2933                 if ( !$found ) {
2934                         wfProfileIn( __METHOD__ . '-pfunc' );
2935
2936                         $colonPos = strpos( $part1, ':' );
2937                         if ( $colonPos !== false ) {
2938                                 # Case sensitive functions
2939                                 $function = substr( $part1, 0, $colonPos );
2940                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2941                                         $function = $this->mFunctionSynonyms[1][$function];
2942                                 } else {
2943                                         # Case insensitive functions
2944                                         $function = strtolower( $function );
2945                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2946                                                 $function = $this->mFunctionSynonyms[0][$function];
2947                                         } else {
2948                                                 $function = false;
2949                                         }
2950                                 }
2951                                 if ( $function ) {
2952                                         $funcArgs = array_map( 'trim', $args );
2953                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2954                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2955                                         $found = true;
2956
2957                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2958                                         //$noargs = true;
2959                                         //$noparse = true;
2960
2961                                         if ( is_array( $result ) ) {
2962                                                 if ( isset( $result[0] ) ) {
2963                                                         $text = $linestart . $result[0];
2964                                                         unset( $result[0] );
2965                                                 }
2966
2967                                                 // Extract flags into the local scope
2968                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
2969                                                 extract( $result );
2970                                         } else {
2971                                                 $text = $linestart . $result;
2972                                         }
2973                                 }
2974                         }
2975                         wfProfileOut( __METHOD__ . '-pfunc' );
2976                 }
2977
2978                 # Template table test
2979
2980                 # Did we encounter this template already? If yes, it is in the cache
2981                 # and we need to check for loops.
2982                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
2983                         $found = true;
2984
2985                         # Infinite loop test
2986                         if ( isset( $this->mTemplatePath[$part1] ) ) {
2987                                 $noparse = true;
2988                                 $noargs = true;
2989                                 $found = true;
2990                                 $text = $linestart .
2991                                         "[[$part1]]<!-- WARNING: template loop detected -->";
2992                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
2993                         } else {
2994                                 # set $text to cached message.
2995                                 $text = $linestart . $this->mTemplates[$piece['title']];
2996                         }
2997                 }
2998
2999                 # Load from database
3000                 $lastPathLevel = $this->mTemplatePath;
3001                 if ( !$found ) {
3002                         wfProfileIn( __METHOD__ . '-loadtpl' );
3003                         $ns = NS_TEMPLATE;
3004                         # declaring $subpage directly in the function call
3005                         # does not work correctly with references and breaks
3006                         # {{/subpage}}-style inclusions
3007                         $subpage = '';
3008                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3009                         if ($subpage !== '') {
3010                                 $ns = $this->mTitle->getNamespace();
3011                         }
3012                         $title = Title::newFromText( $part1, $ns );
3013
3014
3015                         if ( !is_null( $title ) ) {
3016                                 $titleText = $title->getPrefixedText();
3017                                 # Check for language variants if the template is not found
3018                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3019                                         $wgContLang->findVariantLink($part1, $title);
3020                                 }
3021
3022                                 if ( !$title->isExternal() ) {
3023                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3024                                                 $text = SpecialPage::capturePath( $title );
3025                                                 if ( is_string( $text ) ) {
3026                                                         $found = true;
3027                                                         $noparse = true;
3028                                                         $noargs = true;
3029                                                         $isHTML = true;
3030                                                         $this->disableCache();
3031                                                 }
3032                                         } else {
3033                                                 $articleContent = $this->fetchTemplate( $title );
3034                                                 if ( $articleContent !== false ) {
3035                                                         $found = true;
3036                                                         $text = $articleContent;
3037                                                         $replaceHeadings = true;
3038                                                 }
3039                                         }
3040
3041                                         # If the title is valid but undisplayable, make a link to it
3042                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3043                                                 $text = "[[:$titleText]]";
3044                                                 $found = true;
3045                                         }
3046                                 } elseif ( $title->isTrans() ) {
3047                                         // Interwiki transclusion
3048                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3049                                                 $text = $this->interwikiTransclude( $title, 'render' );
3050                                                 $isHTML = true;
3051                                                 $noparse = true;
3052                                         } else {
3053                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3054                                                 $replaceHeadings = true;
3055                                         }
3056                                         $found = true;
3057                                 }
3058
3059                                 # Template cache array insertion
3060                                 # Use the original $piece['title'] not the mangled $part1, so that
3061                                 # modifiers such as RAW: produce separate cache entries
3062                                 if( $found ) {
3063                                         if( $isHTML ) {
3064                                                 // A special page; don't store it in the template cache.
3065                                         } else {
3066                                                 $this->mTemplates[$piece['title']] = $text;
3067                                         }
3068                                         $text = $linestart . $text;
3069                                 }
3070                         }
3071                         wfProfileOut( __METHOD__ . '-loadtpl' );
3072                 }
3073
3074                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3075                         # Error, oversize inclusion
3076                         $text = $linestart .
3077                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3078                         $noparse = true;
3079                         $noargs = true;
3080                 }
3081
3082                 # Recursive parsing, escaping and link table handling
3083                 # Only for HTML output
3084                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3085                         $text = wfEscapeWikiText( $text );
3086                 } elseif ( !$this->ot['msg'] && $found ) {
3087                         if ( $noargs ) {
3088                                 $assocArgs = array();
3089                         } else {
3090                                 # Clean up argument array
3091                                 $assocArgs = array();
3092                                 $index = 1;
3093                                 foreach( $args as $arg ) {
3094                                         $eqpos = strpos( $arg, '=' );
3095                                         if ( $eqpos === false ) {
3096                                                 $assocArgs[$index++] = $arg;
3097                                         } else {
3098                                                 $name = trim( substr( $arg, 0, $eqpos ) );
3099                                                 $value = trim( substr( $arg, $eqpos+1 ) );
3100                                                 if ( $value === false ) {
3101                                                         $value = '';
3102                                                 }
3103                                                 if ( $name !== false ) {
3104                                                         $assocArgs[$name] = $value;
3105                                                 }
3106                                         }
3107                                 }
3108
3109                                 # Add a new element to the templace recursion path
3110                                 $this->mTemplatePath[$part1] = 1;
3111                         }
3112
3113                         if ( !$noparse ) {
3114                                 # If there are any <onlyinclude> tags, only include them
3115                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3116                                         $replacer = new OnlyIncludeReplacer;
3117                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3118                                                 array( &$replacer, 'replace' ), $text );
3119                                         $text = $replacer->output;
3120                                 }
3121                                 # Remove <noinclude> sections and <includeonly> tags
3122                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3123                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3124
3125                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3126                                         # Strip <nowiki>, <pre>, etc.
3127                                         $text = $this->strip( $text, $this->mStripState );
3128                                         if ( $this->ot['html'] ) {
3129                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3130                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3131                                                 $text = Sanitizer::removeHTMLcomments( $text );
3132                                         }
3133                                 }
3134                                 $text = $this->replaceVariables( $text, $assocArgs );
3135
3136                                 # If the template begins with a table or block-level
3137                                 # element, it should be treated as beginning a new line.
3138                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) /*}*/{
3139                                         $text = "\n" . $text;
3140                                 }
3141                         } elseif ( !$noargs ) {
3142                                 # $noparse and !$noargs
3143                                 # Just replace the arguments, not any double-brace items
3144                                 # This is used for rendered interwiki transclusion
3145                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3146                         }
3147                 }
3148                 # Prune lower levels off the recursion check path
3149                 $this->mTemplatePath = $lastPathLevel;
3150
3151                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3152                         # Error, oversize inclusion
3153                         $text = $linestart .
3154                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3155                         $noparse = true;
3156                         $noargs = true;
3157                 }
3158
3159                 if ( !$found ) {
3160                         wfProfileOut( $fname );
3161                         return $piece['text'];
3162                 } else {
3163                         wfProfileIn( __METHOD__ . '-placeholders' );
3164                         if ( $isHTML ) {
3165                                 # Replace raw HTML by a placeholder
3166                                 # Add a blank line preceding, to prevent it from mucking up
3167                                 # immediately preceding headings
3168                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3169                         } else {
3170                                 # replace ==section headers==
3171                                 # XXX this needs to go away once we have a better parser.
3172                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3173                                         if( !is_null( $title ) )
3174                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3175                                         else
3176                                                 $encodedname = base64_encode("");
3177                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3178                                                 PREG_SPLIT_DELIM_CAPTURE);
3179                                         $text = '';
3180                                         $nsec = $headingOffset;
3181                                         for( $i = 0; $i < count($m); $i += 2 ) {
3182                                                 $text .= $m[$i];
3183                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3184                                                 $hl = $m[$i + 1];
3185                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3186                                                         $text .= $hl;
3187                                                         continue;
3188                                                 }
3189                                                 $m2 = array();
3190                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3191                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3192                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3193
3194                                                 $nsec++;
3195                                         }
3196                                 }
3197                         }
3198                         wfProfileOut( __METHOD__ . '-placeholders' );
3199                 }
3200
3201                 # Prune lower levels off the recursion check path
3202                 $this->mTemplatePath = $lastPathLevel;
3203
3204                 if ( !$found ) {
3205                         wfProfileOut( $fname );
3206                         return $piece['text'];
3207                 } else {
3208                         wfProfileOut( $fname );
3209                         return $text;
3210                 }
3211         }
3212
3213         /**
3214          * Fetch the unparsed text of a template and register a reference to it.
3215          */
3216         function fetchTemplate( $title ) {
3217                 $text = false;
3218                 // Loop to fetch the article, with up to 1 redirect
3219                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3220                         $rev = Revision::newFromTitle( $title );
3221                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3222                         if ( !$rev ) {
3223                                 break;
3224                         }
3225                         $text = $rev->getText();
3226                         if ( $text === false ) {
3227                                 break;
3228                         }
3229                         // Redirect?
3230                         $title = Title::newFromRedirect( $text );
3231                 }
3232                 return $text;
3233         }
3234
3235         /**
3236          * Transclude an interwiki link.
3237          */
3238         function interwikiTransclude( $title, $action ) {
3239                 global $wgEnableScaryTranscluding, $wgCanonicalNamespaceNames;
3240
3241                 if (!$wgEnableScaryTranscluding)
3242                         return wfMsg('scarytranscludedisabled');
3243
3244                 // The namespace will actually only be 0 or 10, depending on whether there was a leading :
3245                 // But we'll handle it generally anyway
3246                 if ( $title->getNamespace() ) {
3247                         // Use the canonical namespace, which should work anywhere
3248                         $articleName = $wgCanonicalNamespaceNames[$title->getNamespace()] . ':' . $title->getDBkey();
3249                 } else {
3250                         $articleName = $title->getDBkey();
3251                 }
3252
3253                 $url = str_replace('$1', urlencode($articleName), Title::getInterwikiLink($title->getInterwiki()));
3254                 $url .= "?action=$action";
3255                 if (strlen($url) > 255)
3256                         return wfMsg('scarytranscludetoolong');
3257                 return $this->fetchScaryTemplateMaybeFromCache($url);
3258         }
3259
3260         function fetchScaryTemplateMaybeFromCache($url) {
3261                 global $wgTranscludeCacheExpiry;
3262                 $dbr =& wfGetDB(DB_SLAVE);
3263                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3264                                 array('tc_url' => $url));
3265                 if ($obj) {
3266                         $time = $obj->tc_time;
3267                         $text = $obj->tc_contents;
3268                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3269                                 return $text;
3270                         }
3271                 }
3272
3273                 $text = Http::get($url);
3274                 if (!$text)
3275                         return wfMsg('scarytranscludefailed', $url);
3276
3277                 $dbw =& wfGetDB(DB_MASTER);
3278                 $dbw->replace('transcache', array('tc_url'), array(
3279                         'tc_url' => $url,
3280                         'tc_time' => time(),
3281                         'tc_contents' => $text));
3282                 return $text;
3283         }
3284
3285
3286         /**
3287          * Triple brace replacement -- used for template arguments
3288          * @private
3289          */
3290         function argSubstitution( $matches ) {
3291                 $arg = trim( $matches['title'] );
3292                 $text = $matches['text'];
3293                 $inputArgs = end( $this->mArgStack );
3294
3295                 if ( array_key_exists( $arg, $inputArgs ) ) {
3296                         $text = $inputArgs[$arg];
3297                 } else if (($this->mOutputType == OT_HTML || $this->mOutputType == OT_PREPROCESS ) &&
3298                 null != $matches['parts'] && count($matches['parts']) > 0) {
3299                         $text = $matches['parts'][0];
3300                 }
3301                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3302                         $text = $matches['text'] .
3303                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3304                 }
3305
3306                 return $text;
3307         }
3308
3309         /**
3310          * Increment an include size counter
3311          *
3312          * @param string $type The type of expansion
3313          * @param integer $size The size of the text
3314          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3315          */
3316         function incrementIncludeSize( $type, $size ) {
3317                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3318                         return false;
3319                 } else {
3320                         $this->mIncludeSizes[$type] += $size;
3321                         return true;
3322                 }
3323         }
3324
3325         /**
3326          * Detect __NOGALLERY__ magic word and set a placeholder
3327          */
3328         function stripNoGallery( &$text ) {
3329                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3330                 # do not add TOC
3331                 $mw = MagicWord::get( 'nogallery' );
3332                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3333         }
3334
3335         /**
3336          * Detect __TOC__ magic word and set a placeholder
3337          */
3338         function stripToc( $text ) {
3339                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3340                 # do not add TOC
3341                 $mw = MagicWord::get( 'notoc' );
3342                 if( $mw->matchAndRemove( $text ) ) {
3343                         $this->mShowToc = false;
3344                 }
3345
3346                 $mw = MagicWord::get( 'toc' );
3347                 if( $mw->match( $text ) ) {
3348                         $this->mShowToc = true;
3349                         $this->mForceTocPosition = true;
3350
3351                         // Set a placeholder. At the end we'll fill it in with the TOC.
3352                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3353
3354                         // Only keep the first one.
3355                         $text = $mw->replace( '', $text );
3356                 }
3357                 return $text;
3358         }
3359
3360         /**
3361          * This function accomplishes several tasks:
3362          * 1) Auto-number headings if that option is enabled
3363          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3364          * 3) Add a Table of contents on the top for users who have enabled the option
3365          * 4) Auto-anchor headings
3366          *
3367          * It loops through all headlines, collects the necessary data, then splits up the
3368          * string and re-inserts the newly formatted headlines.
3369          *
3370          * @param string $text
3371          * @param boolean $isMain
3372          * @private
3373          */
3374         function formatHeadings( $text, $isMain=true ) {
3375                 global $wgMaxTocLevel, $wgContLang;
3376
3377                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3378                 if( !$this->mTitle->userCanEdit() ) {
3379                         $showEditLink = 0;
3380                 } else {
3381                         $showEditLink = $this->mOptions->getEditSection();
3382                 }
3383
3384                 # Inhibit editsection links if requested in the page
3385                 $esw =& MagicWord::get( 'noeditsection' );
3386                 if( $esw->matchAndRemove( $text ) ) {
3387                         $showEditLink = 0;
3388                 }
3389
3390                 # Get all headlines for numbering them and adding funky stuff like [edit]
3391                 # links - this is for later, but we need the number of headlines right now
3392                 $matches = array();
3393                 $numMatches = preg_match_all( '/<H([1-6])(.*?'.'>)(.*?)<\/H[1-6] *>/i', $text, $matches );
3394
3395                 # if there are fewer than 4 headlines in the article, do not show TOC
3396                 # unless it's been explicitly enabled.
3397                 $enoughToc = $this->mShowToc &&
3398                         (($numMatches >= 4) || $this->mForceTocPosition);
3399
3400                 # Allow user to stipulate that a page should have a "new section"
3401                 # link added via __NEWSECTIONLINK__
3402                 $mw =& MagicWord::get( 'newsectionlink' );
3403                 if( $mw->matchAndRemove( $text ) )
3404                         $this->mOutput->setNewSection( true );
3405
3406                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3407                 # override above conditions and always show TOC above first header
3408                 $mw =& MagicWord::get( 'forcetoc' );
3409                 if ($mw->matchAndRemove( $text ) ) {
3410                         $this->mShowToc = true;
3411                         $enoughToc = true;
3412                 }
3413
3414                 # Never ever show TOC if no headers
3415                 if( $numMatches < 1 ) {
3416                         $enoughToc = false;
3417                 }
3418
3419                 # We need this to perform operations on the HTML
3420                 $sk =& $this->mOptions->getSkin();
3421
3422                 # headline counter
3423                 $headlineCount = 0;
3424                 $sectionCount = 0; # headlineCount excluding template sections
3425
3426                 # Ugh .. the TOC should have neat indentation levels which can be
3427                 # passed to the skin functions. These are determined here
3428                 $toc = '';
3429                 $full = '';
3430                 $head = array();
3431                 $sublevelCount = array();
3432                 $levelCount = array();
3433                 $toclevel = 0;
3434                 $level = 0;
3435                 $prevlevel = 0;
3436                 $toclevel = 0;
3437                 $prevtoclevel = 0;
3438
3439                 foreach( $matches[3] as $headline ) {
3440                         $istemplate = 0;
3441                         $templatetitle = '';
3442                         $templatesection = 0;
3443                         $numbering = '';
3444                         $mat = array();
3445                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3446                                 $istemplate = 1;
3447                                 $templatetitle = base64_decode($mat[1]);
3448                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3449                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3450                         }
3451
3452                         if( $toclevel ) {
3453                                 $prevlevel = $level;
3454                                 $prevtoclevel = $toclevel;
3455                         }
3456                         $level = $matches[1][$headlineCount];
3457
3458                         if( $doNumberHeadings || $enoughToc ) {
3459
3460                                 if ( $level > $prevlevel ) {
3461                                         # Increase TOC level
3462                                         $toclevel++;
3463                                         $sublevelCount[$toclevel] = 0;
3464                                         if( $toclevel<$wgMaxTocLevel ) {
3465                                                 $toc .= $sk->tocIndent();
3466                                         }
3467                                 }
3468                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3469                                         # Decrease TOC level, find level to jump to
3470
3471                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3472                                                 # Can only go down to level 1
3473                                                 $toclevel = 1;
3474                                         } else {
3475                                                 for ($i = $toclevel; $i > 0; $i--) {
3476                                                         if ( $levelCount[$i] == $level ) {
3477                                                                 # Found last matching level
3478                                                                 $toclevel = $i;
3479                                                                 break;
3480                                                         }
3481                                                         elseif ( $levelCount[$i] < $level ) {
3482                                                                 # Found first matching level below current level
3483                                                                 $toclevel = $i + 1;
3484                                                                 break;
3485                                                         }
3486                                                 }
3487                                         }
3488                                         if( $toclevel<$wgMaxTocLevel ) {
3489                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3490                                         }
3491                                 }
3492                                 else {
3493                                         # No change in level, end TOC line
3494                                         if( $toclevel<$wgMaxTocLevel ) {
3495                                                 $toc .= $sk->tocLineEnd();
3496                                         }
3497                                 }
3498
3499                                 $levelCount[$toclevel] = $level;
3500
3501                                 # count number of headlines for each level
3502                                 @$sublevelCount[$toclevel]++;
3503                                 $dot = 0;
3504                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3505                                         if( !empty( $sublevelCount[$i] ) ) {
3506                                                 if( $dot ) {
3507                                                         $numbering .= '.';
3508                                                 }
3509                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3510                                                 $dot = 1;
3511                                         }
3512                                 }
3513                         }
3514
3515                         # The canonized header is a version of the header text safe to use for links
3516                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3517                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3518
3519                         # Remove link placeholders by the link text.
3520                         #     <!--LINK number-->
3521                         # turns into
3522                         #     link text with suffix
3523                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3524                                                             "\$this->mLinkHolders['texts'][\$1]",
3525                                                             $canonized_headline );
3526                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3527                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3528                                                             $canonized_headline );
3529
3530                         # strip out HTML
3531                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3532                         $tocline = trim( $canonized_headline );
3533                         # Save headline for section edit hint before it's escaped
3534                         $headline_hint = trim( $canonized_headline );
3535                         $canonized_headline = Sanitizer::escapeId( $tocline );
3536                         $refers[$headlineCount] = $canonized_headline;
3537
3538                         # count how many in assoc. array so we can track dupes in anchors
3539                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3540                         $refcount[$headlineCount]=$refers[$canonized_headline];
3541
3542                         # Don't number the heading if it is the only one (looks silly)
3543                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3544                                 # the two are different if the line contains a link
3545                                 $headline=$numbering . ' ' . $headline;
3546                         }
3547
3548                         # Create the anchor for linking from the TOC to the section
3549                         $anchor = $canonized_headline;
3550                         if($refcount[$headlineCount] > 1 ) {
3551                                 $anchor .= '_' . $refcount[$headlineCount];
3552                         }
3553                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3554                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3555                         }
3556                         # give headline the correct <h#> tag
3557                         $head[$headlineCount] = "<a name=\"$anchor\"></a><h".$level.$matches[2][$headlineCount];
3558
3559                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3560                                 if ( empty( $head[$headlineCount] ) ) {
3561                                         $head[$headlineCount] = '';
3562                                 }
3563                                 if( $istemplate )
3564                                         $head[$headlineCount] .= $sk->editSectionLinkForOther($templatetitle, $templatesection);
3565                                 else
3566                                         $head[$headlineCount] .= $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3567                         }
3568                         // Yes, the headline logically goes before the edit section.  Why isn't it there
3569                         // in source?  Ask the CSS people.  The float gets screwed up if you do that.
3570                         // This might be moved to before the editsection at some point so that it will
3571                         // display a bit more prettily without CSS, so please don't rely on the order.
3572                         $head[$headlineCount] .= ' <span class="mw-headline">'.$headline.'</span></h'.$level.'>';
3573
3574                         $headlineCount++;
3575                         if( !$istemplate )
3576                                 $sectionCount++;
3577                 }
3578
3579                 if( $enoughToc ) {
3580                         if( $toclevel<$wgMaxTocLevel ) {
3581                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3582                         }
3583                         $toc = $sk->tocList( $toc );
3584                 }
3585
3586                 # split up and insert constructed headlines
3587
3588                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3589                 $i = 0;
3590
3591                 foreach( $blocks as $block ) {
3592                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3593                                 # This is the [edit] link that appears for the top block of text when
3594                                 # section editing is enabled
3595
3596                                 # Disabled because it broke block formatting
3597                                 # For example, a bullet point in the top line
3598                                 # $full .= $sk->editSectionLink(0);
3599                         }
3600                         $full .= $block;
3601                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3602                                 # Top anchor now in skin
3603                                 $full = $full.$toc;
3604                         }
3605
3606                         if( !empty( $head[$i] ) ) {
3607                                 $full .= $head[$i];
3608                         }
3609                         $i++;
3610                 }
3611                 if( $this->mForceTocPosition ) {
3612                         return str_replace( '<!--MWTOC-->', $toc, $full );
3613                 } else {
3614                         return $full;
3615                 }
3616         }
3617
3618         /**
3619          * Transform wiki markup when saving a page by doing \r\n -> \n
3620          * conversion, substitting signatures, {{subst:}} templates, etc.
3621          *
3622          * @param string $text the text to transform
3623          * @param Title &$title the Title object for the current article
3624          * @param User &$user the User object describing the current user
3625          * @param ParserOptions $options parsing options
3626          * @param bool $clearState whether to clear the parser state first
3627          * @return string the altered wiki markup
3628          * @public
3629          */
3630         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3631                 $this->mOptions = $options;
3632                 $this->mTitle =& $title;
3633                 $this->setOutputType( OT_WIKI );
3634
3635                 if ( $clearState ) {
3636                         $this->clearState();
3637                 }
3638
3639                 $stripState = new StripState;
3640                 $pairs = array(
3641                         "\r\n" => "\n",
3642                 );
3643                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3644                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3645                 $text = $this->pstPass2( $text, $stripState, $user );
3646                 $text = $stripState->unstripBoth( $text );
3647                 return $text;
3648         }
3649
3650         /**
3651          * Pre-save transform helper function
3652          * @private
3653          */
3654         function pstPass2( $text, &$stripState, $user ) {
3655                 global $wgContLang, $wgLocaltimezone;
3656
3657                 /* Note: This is the timestamp saved as hardcoded wikitext to
3658                  * the database, we use $wgContLang here in order to give
3659                  * everyone the same signature and use the default one rather
3660                  * than the one selected in each user's preferences.
3661                  */
3662                 if ( isset( $wgLocaltimezone ) ) {
3663                         $oldtz = getenv( 'TZ' );
3664                         putenv( 'TZ='.$wgLocaltimezone );
3665                 }
3666                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3667                   ' (' . date( 'T' ) . ')';
3668                 if ( isset( $wgLocaltimezone ) ) {
3669                         putenv( 'TZ='.$oldtz );
3670                 }
3671
3672                 # Variable replacement
3673                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3674                 $text = $this->replaceVariables( $text );
3675
3676                 # Strip out <nowiki> etc. added via replaceVariables
3677                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3678
3679                 # Signatures
3680                 $sigText = $this->getUserSig( $user );
3681                 $text = strtr( $text, array(
3682                         '~~~~~' => $d,
3683                         '~~~~' => "$sigText $d",
3684                         '~~~' => $sigText
3685                 ) );
3686
3687                 # Context links: [[|name]] and [[name (context)|]]
3688                 #
3689                 global $wgLegalTitleChars;
3690                 $tc = "[$wgLegalTitleChars]";
3691                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3692
3693                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3694                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3695                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3696
3697                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3698                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3699                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3700
3701                 $t = $this->mTitle->getText();
3702                 $m = array();
3703                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3704                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3705                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3706                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3707                 } else {
3708                         # if there's no context, don't bother duplicating the title
3709                         $text = preg_replace( $p2, '[[\\1]]', $text );
3710                 }
3711
3712                 # Trim trailing whitespace
3713                 # __END__ tag allows for trailing
3714                 # whitespace to be deliberately included
3715                 $text = rtrim( $text );
3716                 $mw =& MagicWord::get( 'end' );
3717                 $mw->matchAndRemove( $text );
3718
3719                 return $text;
3720         }
3721
3722         /**
3723          * Fetch the user's signature text, if any, and normalize to
3724          * validated, ready-to-insert wikitext.
3725          *
3726          * @param User $user
3727          * @return string
3728          * @private
3729          */
3730         function getUserSig( &$user ) {
3731                 $username = $user->getName();
3732                 $nickname = $user->getOption( 'nickname' );
3733                 $nickname = $nickname === '' ? $username : $nickname;
3734
3735                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3736                         # Sig. might contain markup; validate this
3737                         if( $this->validateSig( $nickname ) !== false ) {
3738                                 # Validated; clean up (if needed) and return it
3739                                 return $this->cleanSig( $nickname, true );
3740                         } else {
3741                                 # Failed to validate; fall back to the default
3742                                 $nickname = $username;
3743                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3744                         }
3745                 }
3746
3747                 // Make sure nickname doesnt get a sig in a sig
3748                 $nickname = $this->cleanSigInSig( $nickname );
3749
3750                 # If we're still here, make it a link to the user page
3751                 $userpage = $user->getUserPage();
3752                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3753         }
3754
3755         /**
3756          * Check that the user's signature contains no bad XML
3757          *
3758          * @param string $text
3759          * @return mixed An expanded string, or false if invalid.
3760          */
3761         function validateSig( $text ) {
3762                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3763         }
3764
3765         /**
3766          * Clean up signature text
3767          *
3768          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3769          * 2) Substitute all transclusions
3770          *
3771          * @param string $text
3772          * @param $parsing Whether we're cleaning (preferences save) or parsing
3773          * @return string Signature text
3774          */
3775         function cleanSig( $text, $parsing = false ) {
3776                 global $wgTitle;
3777                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3778
3779                 $substWord = MagicWord::get( 'subst' );
3780                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3781                 $substText = '{{' . $substWord->getSynonym( 0 );
3782
3783                 $text = preg_replace( $substRegex, $substText, $text );
3784                 $text = $this->cleanSigInSig( $text );
3785                 $text = $this->replaceVariables( $text );
3786
3787                 $this->clearState();
3788                 return $text;
3789         }
3790
3791         /**
3792          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3793          * @param string $text
3794          * @return string Signature text with /~{3,5}/ removed
3795          */
3796         function cleanSigInSig( $text ) {
3797                 $text = preg_replace( '/~{3,5}/', '', $text );
3798                 return $text;
3799         }
3800
3801         /**
3802          * Set up some variables which are usually set up in parse()
3803          * so that an external function can call some class members with confidence
3804          * @public
3805          */
3806         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3807                 $this->mTitle =& $title;
3808                 $this->mOptions = $options;
3809                 $this->setOutputType( $outputType );
3810                 if ( $clearState ) {
3811                         $this->clearState();
3812                 }
3813         }
3814
3815         /**
3816          * Transform a MediaWiki message by replacing magic variables.
3817          *
3818          * @param string $text the text to transform
3819          * @param ParserOptions $options  options
3820          * @return string the text with variables substituted
3821          * @public
3822          */
3823         function transformMsg( $text, $options ) {
3824                 global $wgTitle;
3825                 static $executing = false;
3826
3827                 $fname = "Parser::transformMsg";
3828
3829                 # Guard against infinite recursion
3830                 if ( $executing ) {
3831                         return $text;
3832                 }
3833                 $executing = true;
3834
3835                 wfProfileIn($fname);
3836
3837                 if ( $wgTitle ) {
3838                         $this->mTitle = $wgTitle;
3839                 } else {
3840                         $this->mTitle = Title::newFromText('msg');
3841                 }
3842                 $this->mOptions = $options;
3843                 $this->setOutputType( OT_MSG );
3844                 $this->clearState();
3845                 $text = $this->replaceVariables( $text );
3846
3847                 $executing = false;
3848                 wfProfileOut($fname);
3849                 return $text;
3850         }
3851
3852         /**
3853          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3854          * The callback should have the following form:
3855          *    function myParserHook( $text, $params, &$parser ) { ... }
3856          *
3857          * Transform and return $text. Use $parser for any required context, e.g. use
3858          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3859          *
3860          * @public
3861          *
3862          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3863          * @param mixed $callback The callback function (and object) to use for the tag
3864          *
3865          * @return The old value of the mTagHooks array associated with the hook
3866          */
3867         function setHook( $tag, $callback ) {
3868                 $tag = strtolower( $tag );
3869                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3870                 $this->mTagHooks[$tag] = $callback;
3871
3872                 return $oldVal;
3873         }
3874
3875         /**
3876          * Create a function, e.g. {{sum:1|2|3}}
3877          * The callback function should have the form:
3878          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3879          *
3880          * The callback may either return the text result of the function, or an array with the text
3881          * in element 0, and a number of flags in the other elements. The names of the flags are
3882          * specified in the keys. Valid flags are:
3883          *   found                     The text returned is valid, stop processing the template. This
3884          *                             is on by default.
3885          *   nowiki                    Wiki markup in the return value should be escaped
3886          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3887          *   noargs                    Don't replace triple-brace arguments in the return value
3888          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3889          *
3890          * @public
3891          *
3892          * @param string $id The magic word ID
3893          * @param mixed $callback The callback function (and object) to use
3894          * @param integer $flags a combination of the following flags:
3895          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3896          *
3897          * @return The old callback function for this name, if any
3898          */
3899         function setFunctionHook( $id, $callback, $flags = 0 ) {
3900                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
3901                 $this->mFunctionHooks[$id] = $callback;
3902
3903                 # Add to function cache
3904                 $mw = MagicWord::get( $id );
3905                 if( !$mw )
3906                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3907
3908                 $synonyms = $mw->getSynonyms();
3909                 $sensitive = intval( $mw->isCaseSensitive() );
3910
3911                 foreach ( $synonyms as $syn ) {
3912                         # Case
3913                         if ( !$sensitive ) {
3914                                 $syn = strtolower( $syn );
3915                         }
3916                         # Add leading hash
3917                         if ( !( $flags & SFH_NO_HASH ) ) {
3918                                 $syn = '#' . $syn;
3919                         }
3920                         # Remove trailing colon
3921                         if ( substr( $syn, -1, 1 ) == ':' ) {
3922                                 $syn = substr( $syn, 0, -1 );
3923                         }
3924                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3925                 }
3926                 return $oldVal;
3927         }
3928
3929         /**
3930          * Get all registered function hook identifiers
3931          *
3932          * @return array
3933          */
3934         function getFunctionHooks() {
3935                 return array_keys( $this->mFunctionHooks );
3936         }
3937
3938         /**
3939          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3940          * Placeholders created in Skin::makeLinkObj()
3941          * Returns an array of links found, indexed by PDBK:
3942          *  0 - broken
3943          *  1 - normal link
3944          *  2 - stub
3945          * $options is a bit field, RLH_FOR_UPDATE to select for update
3946          */
3947         function replaceLinkHolders( &$text, $options = 0 ) {
3948                 global $wgUser;
3949                 global $wgContLang;
3950
3951                 $fname = 'Parser::replaceLinkHolders';
3952                 wfProfileIn( $fname );
3953
3954                 $pdbks = array();
3955                 $colours = array();
3956                 $sk =& $this->mOptions->getSkin();
3957                 $linkCache =& LinkCache::singleton();
3958
3959                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3960                         wfProfileIn( $fname.'-check' );
3961                         $dbr =& wfGetDB( DB_SLAVE );
3962                         $page = $dbr->tableName( 'page' );
3963                         $threshold = $wgUser->getOption('stubthreshold');
3964
3965                         # Sort by namespace
3966                         asort( $this->mLinkHolders['namespaces'] );
3967
3968                         # Generate query
3969                         $query = false;
3970                         $current = null;
3971                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3972                                 # Make title object
3973                                 $title = $this->mLinkHolders['titles'][$key];
3974
3975                                 # Skip invalid entries.
3976                                 # Result will be ugly, but prevents crash.
3977                                 if ( is_null( $title ) ) {
3978                                         continue;
3979                                 }
3980                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
3981
3982                                 # Check if it's a static known link, e.g. interwiki
3983                                 if ( $title->isAlwaysKnown() ) {
3984                                         $colours[$pdbk] = 1;
3985                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
3986                                         $colours[$pdbk] = 1;
3987                                         $this->mOutput->addLink( $title, $id );
3988                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
3989                                         $colours[$pdbk] = 0;
3990                                 } else {
3991                                         # Not in the link cache, add it to the query
3992                                         if ( !isset( $current ) ) {
3993                                                 $current = $ns;
3994                                                 $query =  "SELECT page_id, page_namespace, page_title";
3995                                                 if ( $threshold > 0 ) {
3996                                                         $query .= ', page_len, page_is_redirect';
3997                                                 }
3998                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
3999                                         } elseif ( $current != $ns ) {
4000                                                 $current = $ns;
4001                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4002                                         } else {
4003                                                 $query .= ', ';
4004                                         }
4005
4006                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4007                                 }
4008                         }
4009                         if ( $query ) {
4010                                 $query .= '))';
4011                                 if ( $options & RLH_FOR_UPDATE ) {
4012                                         $query .= ' FOR UPDATE';
4013                                 }
4014
4015                                 $res = $dbr->query( $query, $fname );
4016
4017                                 # Fetch data and form into an associative array
4018                                 # non-existent = broken
4019                                 # 1 = known
4020                                 # 2 = stub
4021                                 while ( $s = $dbr->fetchObject($res) ) {
4022                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4023                                         $pdbk = $title->getPrefixedDBkey();
4024                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4025                                         $this->mOutput->addLink( $title, $s->page_id );
4026
4027                                         if ( $threshold >  0 ) {
4028                                                 $size = $s->page_len;
4029                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4030                                                         $colours[$pdbk] = 1;
4031                                                 } else {
4032                                                         $colours[$pdbk] = 2;
4033                                                 }
4034                                         } else {
4035                                                 $colours[$pdbk] = 1;
4036                                         }
4037                                 }
4038                         }
4039                         wfProfileOut( $fname.'-check' );
4040
4041                         # Do a second query for different language variants of links and categories
4042                         if($wgContLang->hasVariants()){
4043                                 $linkBatch = new LinkBatch();
4044                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4045                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4046                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4047
4048                                 $categories = $this->mOutput->getCategoryLinks();
4049
4050                                 // Add variants of links to link batch
4051                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4052                                         $title = $this->mLinkHolders['titles'][$key];
4053                                         if ( is_null( $title ) )
4054                                                 continue;
4055
4056                                         $pdbk = $title->getPrefixedDBkey();
4057                                         $titleText = $title->getText();
4058
4059                                         // generate all variants of the link title text
4060                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4061
4062                                         // if link was not found (in first query), add all variants to query
4063                                         if ( !isset($colours[$pdbk]) ){
4064                                                 foreach($allTextVariants as $textVariant){
4065                                                         if($textVariant != $titleText){
4066                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4067                                                                 if(is_null($variantTitle)) continue;
4068                                                                 $linkBatch->addObj( $variantTitle );
4069                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4070                                                         }
4071                                                 }
4072                                         }
4073                                 }
4074
4075                                 // process categories, check if a category exists in some variant
4076                                 foreach( $categories as $category){
4077                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4078                                         foreach($variants as $variant){
4079                                                 $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4080                                                 if(is_null($variantTitle)) continue;
4081                                                 $linkBatch->addObj( $variantTitle );
4082                                                 $categoryMap[$variant] = $category;
4083                                         }
4084                                 }
4085
4086
4087                                 if(!$linkBatch->isEmpty()){
4088                                         // construct query
4089                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4090
4091                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4092                                         if ( $threshold > 0 ) {
4093                                                 $variantQuery .= ', page_len, page_is_redirect';
4094                                         }
4095
4096                                         $variantQuery .= " FROM $page WHERE $titleClause";
4097                                         if ( $options & RLH_FOR_UPDATE ) {
4098                                                 $variantQuery .= ' FOR UPDATE';
4099                                         }
4100
4101                                         $varRes = $dbr->query( $variantQuery, $fname );
4102
4103                                         // for each found variants, figure out link holders and replace
4104                                         while ( $s = $dbr->fetchObject($varRes) ) {
4105
4106                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4107                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4108                                                 $vardbk = $variantTitle->getDBkey();
4109                                                 $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4110                                                 $this->mOutput->addLink( $variantTitle, $s->page_id );
4111
4112                                                 $holderKeys = array();
4113                                                 if(isset($variantMap[$varPdbk]))
4114                                                         $holderKeys = $variantMap[$varPdbk];
4115
4116                                                 // loop over link holders
4117                                                 foreach($holderKeys as $key){
4118                                                         $title = $this->mLinkHolders['titles'][$key];
4119                                                         if ( is_null( $title ) ) continue;
4120
4121                                                         $pdbk = $title->getPrefixedDBkey();
4122
4123                                                         if(!isset($colours[$pdbk])){
4124                                                                 // found link in some of the variants, replace the link holder data
4125                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4126                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4127
4128                                                                 // set pdbk and colour
4129                                                                 $pdbks[$key] = $varPdbk;
4130                                                                 if ( $threshold >  0 ) {
4131                                                                         $size = $s->page_len;
4132                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4133                                                                                 $colours[$varPdbk] = 1;
4134                                                                         } else {
4135                                                                                 $colours[$varPdbk] = 2;
4136                                                                         }
4137                                                                 }
4138                                                                 else {
4139                                                                         $colours[$varPdbk] = 1;
4140                                                                 }
4141                                                         }
4142                                                 }
4143
4144                                                 // check if the object is a variant of a category
4145                                                 if(isset($categoryMap[$vardbk])){
4146                                                         $oldkey = $categoryMap[$vardbk];
4147                                                         if($oldkey != $vardbk)
4148                                                                 $varCategories[$oldkey]=$vardbk;
4149                                                 }
4150                                         }
4151
4152                                         // rebuild the categories in original order (if there are replacements)
4153                                         if(count($varCategories)>0){
4154                                                 $newCats = array();
4155                                                 $originalCats = $this->mOutput->getCategories();
4156                                                 foreach($originalCats as $cat => $sortkey){
4157                                                         // make the replacement
4158                                                         if( array_key_exists($cat,$varCategories) )
4159                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4160                                                         else $newCats[$cat] = $sortkey;
4161                                                 }
4162                                                 $this->mOutput->setCategoryLinks($newCats);
4163                                         }
4164                                 }
4165                         }
4166
4167                         # Construct search and replace arrays
4168                         wfProfileIn( $fname.'-construct' );
4169                         $replacePairs = array();
4170                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4171                                 $pdbk = $pdbks[$key];
4172                                 $searchkey = "<!--LINK $key-->";
4173                                 $title = $this->mLinkHolders['titles'][$key];
4174                                 if ( empty( $colours[$pdbk] ) ) {
4175                                         $linkCache->addBadLinkObj( $title );
4176                                         $colours[$pdbk] = 0;
4177                                         $this->mOutput->addLink( $title, 0 );
4178                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4179                                                                         $this->mLinkHolders['texts'][$key],
4180                                                                         $this->mLinkHolders['queries'][$key] );
4181                                 } elseif ( $colours[$pdbk] == 1 ) {
4182                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4183                                                                         $this->mLinkHolders['texts'][$key],
4184                                                                         $this->mLinkHolders['queries'][$key] );
4185                                 } elseif ( $colours[$pdbk] == 2 ) {
4186                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4187                                                                         $this->mLinkHolders['texts'][$key],
4188                                                                         $this->mLinkHolders['queries'][$key] );
4189                                 }
4190                         }
4191                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4192                         wfProfileOut( $fname.'-construct' );
4193
4194                         # Do the thing
4195                         wfProfileIn( $fname.'-replace' );
4196                         $text = preg_replace_callback(
4197                                 '/(<!--LINK .*?-->)/',
4198                                 $replacer->cb(),
4199                                 $text);
4200
4201                         wfProfileOut( $fname.'-replace' );
4202                 }
4203
4204                 # Now process interwiki link holders
4205                 # This is quite a bit simpler than internal links
4206                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4207                         wfProfileIn( $fname.'-interwiki' );
4208                         # Make interwiki link HTML
4209                         $replacePairs = array();
4210                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4211                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4212                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4213                         }
4214                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4215
4216                         $text = preg_replace_callback(
4217                                 '/<!--IWLINK (.*?)-->/',
4218                                 $replacer->cb(),
4219                                 $text );
4220                         wfProfileOut( $fname.'-interwiki' );
4221                 }
4222
4223                 wfProfileOut( $fname );
4224                 return $colours;
4225         }
4226
4227         /**
4228          * Replace <!--LINK--> link placeholders with plain text of links
4229          * (not HTML-formatted).
4230          * @param string $text
4231          * @return string
4232          */
4233         function replaceLinkHoldersText( $text ) {
4234                 $fname = 'Parser::replaceLinkHoldersText';
4235                 wfProfileIn( $fname );
4236
4237                 $text = preg_replace_callback(
4238                         '/<!--(LINK|IWLINK) (.*?)-->/',
4239                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4240                         $text );
4241
4242                 wfProfileOut( $fname );
4243                 return $text;
4244         }
4245
4246         /**
4247          * @param array $matches
4248          * @return string
4249          * @private
4250          */
4251         function replaceLinkHoldersTextCallback( $matches ) {
4252                 $type = $matches[1];
4253                 $key  = $matches[2];
4254                 if( $type == 'LINK' ) {
4255                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4256                                 return $this->mLinkHolders['texts'][$key];
4257                         }
4258                 } elseif( $type == 'IWLINK' ) {
4259                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4260                                 return $this->mInterwikiLinkHolders['texts'][$key];
4261                         }
4262                 }
4263                 return $matches[0];
4264         }
4265
4266         /**
4267          * Tag hook handler for 'pre'.
4268          */
4269         function renderPreTag( $text, $attribs ) {
4270                 // Backwards-compatibility hack
4271                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4272
4273                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4274                 return wfOpenElement( 'pre', $attribs ) .
4275                         Xml::escapeTagsOnly( $content ) .
4276                         '</pre>';
4277         }
4278
4279         /**
4280          * Renders an image gallery from a text with one line per image.
4281          * text labels may be given by using |-style alternative text. E.g.
4282          *   Image:one.jpg|The number "1"
4283          *   Image:tree.jpg|A tree
4284          * given as text will return the HTML of a gallery with two images,
4285          * labeled 'The number "1"' and
4286          * 'A tree'.
4287          */
4288         function renderImageGallery( $text, $params ) {
4289                 $ig = new ImageGallery();
4290                 $ig->setShowBytes( false );
4291                 $ig->setShowFilename( false );
4292                 $ig->setParsing();
4293                 $ig->useSkin( $this->mOptions->getSkin() );
4294
4295                 if( isset( $params['caption'] ) )
4296                         $ig->setCaption( $params['caption'] );
4297
4298                 $lines = explode( "\n", $text );
4299                 foreach ( $lines as $line ) {
4300                         # match lines like these:
4301                         # Image:someimage.jpg|This is some image
4302                         $matches = array();
4303                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4304                         # Skip empty lines
4305                         if ( count( $matches ) == 0 ) {
4306                                 continue;
4307                         }
4308                         $tp = Title::newFromText( $matches[1] );
4309                         $nt =& $tp;
4310                         if( is_null( $nt ) ) {
4311                                 # Bogus title. Ignore these so we don't bomb out later.
4312                                 continue;
4313                         }
4314                         if ( isset( $matches[3] ) ) {
4315                                 $label = $matches[3];
4316                         } else {
4317                                 $label = '';
4318                         }
4319
4320                         $pout = $this->parse( $label,
4321                                 $this->mTitle,
4322                                 $this->mOptions,
4323                                 false, // Strip whitespace...?
4324                                 false  // Don't clear state!
4325                         );
4326                         $html = $pout->getText();
4327
4328                         $ig->add( new Image( $nt ), $html );
4329
4330                         # Only add real images (bug #5586)
4331                         if ( $nt->getNamespace() == NS_IMAGE ) {
4332                                 $this->mOutput->addImage( $nt->getDBkey() );
4333                         }
4334                 }
4335                 return $ig->toHTML();
4336         }
4337
4338         /**
4339          * Parse image options text and use it to make an image
4340          */
4341         function makeImage( $nt, $options ) {
4342                 global $wgUseImageResize, $wgDjvuRenderer;
4343
4344                 $align = '';
4345
4346                 # Check if the options text is of the form "options|alt text"
4347                 # Options are:
4348                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4349                 #  * left               no resizing, just left align. label is used for alt= only
4350                 #  * right              same, but right aligned
4351                 #  * none               same, but not aligned
4352                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4353                 #  * center             center the image
4354                 #  * framed             Keep original image size, no magnify-button.
4355
4356                 $part = explode( '|', $options);
4357
4358                 $mwThumb  =& MagicWord::get( 'img_thumbnail' );
4359                 $mwManualThumb =& MagicWord::get( 'img_manualthumb' );
4360                 $mwLeft   =& MagicWord::get( 'img_left' );
4361                 $mwRight  =& MagicWord::get( 'img_right' );
4362                 $mwNone   =& MagicWord::get( 'img_none' );
4363                 $mwWidth  =& MagicWord::get( 'img_width' );
4364                 $mwCenter =& MagicWord::get( 'img_center' );
4365                 $mwFramed =& MagicWord::get( 'img_framed' );
4366                 $mwPage   =& MagicWord::get( 'img_page' );
4367                 $caption = '';
4368
4369                 $width = $height = $framed = $thumb = false;
4370                 $page = null;
4371                 $manual_thumb = '' ;
4372
4373                 foreach( $part as $val ) {
4374                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4375                                 $thumb=true;
4376                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4377                                 # use manually specified thumbnail
4378                                 $thumb=true;
4379                                 $manual_thumb = $match;
4380                         } elseif ( ! is_null( $mwRight->matchVariableStartToEnd($val) ) ) {
4381                                 # remember to set an alignment, don't render immediately
4382                                 $align = 'right';
4383                         } elseif ( ! is_null( $mwLeft->matchVariableStartToEnd($val) ) ) {
4384                                 # remember to set an alignment, don't render immediately
4385                                 $align = 'left';
4386                         } elseif ( ! is_null( $mwCenter->matchVariableStartToEnd($val) ) ) {
4387                                 # remember to set an alignment, don't render immediately
4388                                 $align = 'center';
4389                         } elseif ( ! is_null( $mwNone->matchVariableStartToEnd($val) ) ) {
4390                                 # remember to set an alignment, don't render immediately
4391                                 $align = 'none';
4392                         } elseif ( isset( $wgDjvuRenderer ) && $wgDjvuRenderer
4393                                    && ! is_null( $match = $mwPage->matchVariableStartToEnd($val) ) ) {
4394                                 # Select a page in a multipage document
4395                                 $page = $match;
4396                         } elseif ( $wgUseImageResize && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4397                                 wfDebug( "img_width match: $match\n" );
4398                                 # $match is the image width in pixels
4399                                 $m = array();
4400                                 if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4401                                         $width = intval( $m[1] );
4402                                         $height = intval( $m[2] );
4403                                 } else {
4404                                         $width = intval($match);
4405                                 }
4406                         } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4407                                 $framed=true;
4408                         } else {
4409                                 $caption = $val;
4410                         }
4411                 }
4412                 # Strip bad stuff out of the alt text
4413                 $alt = $this->replaceLinkHoldersText( $caption );
4414
4415                 # make sure there are no placeholders in thumbnail attributes
4416                 # that are later expanded to html- so expand them now and
4417                 # remove the tags
4418                 $alt = $this->mStripState->unstripBoth( $alt );
4419                 $alt = Sanitizer::stripAllTags( $alt );
4420
4421                 # Linker does the rest
4422                 $sk =& $this->mOptions->getSkin();
4423                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb, $page );
4424         }
4425
4426         /**
4427          * Set a flag in the output object indicating that the content is dynamic and
4428          * shouldn't be cached.
4429          */
4430         function disableCache() {
4431                 wfDebug( "Parser output marked as uncacheable.\n" );
4432                 $this->mOutput->mCacheTime = -1;
4433         }
4434
4435         /**#@+
4436          * Callback from the Sanitizer for expanding items found in HTML attribute
4437          * values, so they can be safely tested and escaped.
4438          * @param string $text
4439          * @param array $args
4440          * @return string
4441          * @private
4442          */
4443         function attributeStripCallback( &$text, $args ) {
4444                 $text = $this->replaceVariables( $text, $args );
4445                 $text = $this->mStripState->unstripBoth( $text );
4446                 return $text;
4447         }
4448
4449         /**#@-*/
4450
4451         /**#@+
4452          * Accessor/mutator
4453          */
4454         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4455         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4456         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4457         /**#@-*/
4458
4459         /**#@+
4460          * Accessor
4461          */
4462         function getTags() { return array_keys( $this->mTagHooks ); }
4463         /**#@-*/
4464
4465
4466         /**
4467          * Break wikitext input into sections, and either pull or replace
4468          * some particular section's text.
4469          *
4470          * External callers should use the getSection and replaceSection methods.
4471          *
4472          * @param $text Page wikitext
4473          * @param $section Numbered section. 0 pulls the text before the first
4474          *                 heading; other numbers will pull the given section
4475          *                 along with its lower-level subsections.
4476          * @param $mode One of "get" or "replace"
4477          * @param $newtext Replacement text for section data.
4478          * @return string for "get", the extracted section text.
4479          *                for "replace", the whole page with the section replaced.
4480          */
4481         private function extractSections( $text, $section, $mode, $newtext='' ) {
4482                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4483                 # comments to be stripped as well)
4484                 $stripState = new StripState;
4485
4486                 $oldOutputType = $this->mOutputType;
4487                 $oldOptions = $this->mOptions;
4488                 $this->mOptions = new ParserOptions();
4489                 $this->setOutputType( OT_WIKI );
4490
4491                 $striptext = $this->strip( $text, $stripState, true );
4492
4493                 $this->setOutputType( $oldOutputType );
4494                 $this->mOptions = $oldOptions;
4495
4496                 # now that we can be sure that no pseudo-sections are in the source,
4497                 # split it up by section
4498                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4499                 $comment = "(?:$uniq-!--.*?QINU)";
4500                 $secs = preg_split(
4501                 /*
4502                         "/
4503                         ^(
4504                         (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4505                         (?:
4506                                 (=+) # Should this be limited to 6?
4507                                 .+?  # Section title...
4508                                 \\2  # Ending = count must match start
4509                         |
4510                                 ^
4511                                 <h([1-6])\b.*?>
4512                                 .*?
4513                                 <\/h\\3\s*>
4514                         )
4515                         (?:$comment|<\/?noinclude>|\s+)* # Trailing whitespace ok
4516                         )$
4517                         /mix",
4518                 */
4519                         "/
4520                         (
4521                                 ^
4522                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4523                                 (=+) # Should this be limited to 6?
4524                                 .+?  # Section title...
4525                                 \\2  # Ending = count must match start
4526                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4527                                 $
4528                         |
4529                                 <h([1-6])\b.*?>
4530                                 .*?
4531                                 <\/h\\3\s*>
4532                         )
4533                         /mix",
4534                         $striptext, -1,
4535                         PREG_SPLIT_DELIM_CAPTURE);
4536
4537                 if( $mode == "get" ) {
4538                         if( $section == 0 ) {
4539                                 // "Section 0" returns the content before any other section.
4540                                 $rv = $secs[0];
4541                         } else {
4542                                 $rv = "";
4543                         }
4544                 } elseif( $mode == "replace" ) {
4545                         if( $section == 0 ) {
4546                                 $rv = $newtext . "\n\n";
4547                                 $remainder = true;
4548                         } else {
4549                                 $rv = $secs[0];
4550                                 $remainder = false;
4551                         }
4552                 }
4553                 $count = 0;
4554                 $sectionLevel = 0;
4555                 for( $index = 1; $index < count( $secs ); ) {
4556                         $headerLine = $secs[$index++];
4557                         if( $secs[$index] ) {
4558                                 // A wiki header
4559                                 $headerLevel = strlen( $secs[$index++] );
4560                         } else {
4561                                 // An HTML header
4562                                 $index++;
4563                                 $headerLevel = intval( $secs[$index++] );
4564                         }
4565                         $content = $secs[$index++];
4566
4567                         $count++;
4568                         if( $mode == "get" ) {
4569                                 if( $count == $section ) {
4570                                         $rv = $headerLine . $content;
4571                                         $sectionLevel = $headerLevel;
4572                                 } elseif( $count > $section ) {
4573                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4574                                                 $rv .= $headerLine . $content;
4575                                         } else {
4576                                                 // Broke out to a higher-level section
4577                                                 break;
4578                                         }
4579                                 }
4580                         } elseif( $mode == "replace" ) {
4581                                 if( $count < $section ) {
4582                                         $rv .= $headerLine . $content;
4583                                 } elseif( $count == $section ) {
4584                                         $rv .= $newtext . "\n\n";
4585                                         $sectionLevel = $headerLevel;
4586                                 } elseif( $count > $section ) {
4587                                         if( $headerLevel <= $sectionLevel ) {
4588                                                 // Passed the section's sub-parts.
4589                                                 $remainder = true;
4590                                         }
4591                                         if( $remainder ) {
4592                                                 $rv .= $headerLine . $content;
4593                                         }
4594                                 }
4595                         }
4596                 }
4597                 # reinsert stripped tags
4598                 $rv = trim( $stripState->unstripBoth( $rv ) );
4599                 return $rv;
4600         }
4601
4602         /**
4603          * This function returns the text of a section, specified by a number ($section).
4604          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4605          * the first section before any such heading (section 0).
4606          *
4607          * If a section contains subsections, these are also returned.
4608          *
4609          * @param $text String: text to look in
4610          * @param $section Integer: section number
4611          * @return string text of the requested section
4612          */
4613         function getSection( $text, $section ) {
4614                 return $this->extractSections( $text, $section, "get" );
4615         }
4616
4617         function replaceSection( $oldtext, $section, $text ) {
4618                 return $this->extractSections( $oldtext, $section, "replace", $text );
4619         }
4620
4621         /**
4622          * Get the timestamp associated with the current revision, adjusted for
4623          * the default server-local timestamp
4624          */
4625         function getRevisionTimestamp() {
4626                 if ( is_null( $this->mRevisionTimestamp ) ) {
4627                         wfProfileIn( __METHOD__ );
4628                         global $wgContLang;
4629                         $dbr =& wfGetDB( DB_SLAVE );
4630                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4631                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4632
4633                         // Normalize timestamp to internal MW format for timezone processing.
4634                         // This has the added side-effect of replacing a null value with
4635                         // the current time, which gives us more sensible behavior for
4636                         // previews.
4637                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4638
4639                         // The cryptic '' timezone parameter tells to use the site-default
4640                         // timezone offset instead of the user settings.
4641                         //
4642                         // Since this value will be saved into the parser cache, served
4643                         // to other users, and potentially even used inside links and such,
4644                         // it needs to be consistent for all visitors.
4645                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4646
4647                         wfProfileOut( __METHOD__ );
4648                 }
4649                 return $this->mRevisionTimestamp;
4650         }
4651 }
4652
4653 /**
4654  * @todo document
4655  * @package MediaWiki
4656  */
4657 class ParserOutput
4658 {
4659         var $mText,             # The output text
4660                 $mLanguageLinks,    # List of the full text of language links, in the order they appear
4661                 $mCategories,       # Map of category names to sort keys
4662                 $mContainsOldMagic, # Boolean variable indicating if the input contained variables like {{CURRENTDAY}}
4663                 $mCacheTime,        # Time when this object was generated, or -1 for uncacheable. Used in ParserCache.
4664                 $mVersion,          # Compatibility check
4665                 $mTitleText,        # title text of the chosen language variant
4666                 $mLinks,            # 2-D map of NS/DBK to ID for the links in the document. ID=zero for broken.
4667                 $mTemplates,        # 2-D map of NS/DBK to ID for the template references. ID=zero for broken.
4668                 $mImages,           # DB keys of the images used, in the array key only
4669                 $mExternalLinks,    # External link URLs, in the key only
4670                 $mHTMLtitle,            # Display HTML title
4671                 $mSubtitle,                     # Additional subtitle
4672                 $mNewSection,           # Show a new section link?
4673                 $mNoGallery;            # No gallery on category page? (__NOGALLERY__)
4674
4675         function ParserOutput( $text = '', $languageLinks = array(), $categoryLinks = array(),
4676                 $containsOldMagic = false, $titletext = '' )
4677         {
4678                 $this->mText = $text;
4679                 $this->mLanguageLinks = $languageLinks;
4680                 $this->mCategories = $categoryLinks;
4681                 $this->mContainsOldMagic = $containsOldMagic;
4682                 $this->mCacheTime = '';
4683                 $this->mVersion = MW_PARSER_VERSION;
4684                 $this->mTitleText = $titletext;
4685                 $this->mLinks = array();
4686                 $this->mTemplates = array();
4687                 $this->mImages = array();
4688                 $this->mExternalLinks = array();
4689                 $this->mHTMLtitle = "" ;
4690                 $this->mSubtitle = "" ;
4691                 $this->mNewSection = false;
4692                 $this->mNoGallery = false;
4693         }
4694
4695         function getText()                   { return $this->mText; }
4696         function &getLanguageLinks()          { return $this->mLanguageLinks; }
4697         function getCategoryLinks()          { return array_keys( $this->mCategories ); }
4698         function &getCategories()            { return $this->mCategories; }
4699         function getCacheTime()              { return $this->mCacheTime; }
4700         function getTitleText()              { return $this->mTitleText; }
4701         function &getLinks()                 { return $this->mLinks; }
4702         function &getTemplates()             { return $this->mTemplates; }
4703         function &getImages()                { return $this->mImages; }
4704         function &getExternalLinks()         { return $this->mExternalLinks; }
4705         function getNoGallery()              { return $this->mNoGallery; }
4706         function getSubtitle()               { return $this->mSubtitle; }
4707
4708         function containsOldMagic()          { return $this->mContainsOldMagic; }
4709         function setText( $text )            { return wfSetVar( $this->mText, $text ); }
4710         function setLanguageLinks( $ll )     { return wfSetVar( $this->mLanguageLinks, $ll ); }
4711         function setCategoryLinks( $cl )     { return wfSetVar( $this->mCategories, $cl ); }
4712         function setContainsOldMagic( $com ) { return wfSetVar( $this->mContainsOldMagic, $com ); }
4713         function setCacheTime( $t )          { return wfSetVar( $this->mCacheTime, $t ); }
4714         function setTitleText( $t )          { return wfSetVar($this->mTitleText, $t); }
4715         function setSubtitle( $st )          { return wfSetVar( $this->mSubtitle, $st ); }
4716
4717         function addCategory( $c, $sort )    { $this->mCategories[$c] = $sort; }
4718         function addImage( $name )           { $this->mImages[$name] = 1; }
4719         function addLanguageLink( $t )       { $this->mLanguageLinks[] = $t; }
4720         function addExternalLink( $url )     { $this->mExternalLinks[$url] = 1; }
4721
4722         function setNewSection( $value ) {
4723                 $this->mNewSection = (bool)$value;
4724         }
4725         function getNewSection() {
4726                 return (bool)$this->mNewSection;
4727         }
4728
4729         function addLink( $title, $id = null ) {
4730                 $ns = $title->getNamespace();
4731                 $dbk = $title->getDBkey();
4732                 if ( !isset( $this->mLinks[$ns] ) ) {
4733                         $this->mLinks[$ns] = array();
4734                 }
4735                 if ( is_null( $id ) ) {
4736                         $id = $title->getArticleID();
4737                 }
4738                 $this->mLinks[$ns][$dbk] = $id;
4739         }
4740
4741         function addTemplate( $title, $id ) {
4742                 $ns = $title->getNamespace();
4743                 $dbk = $title->getDBkey();
4744                 if ( !isset( $this->mTemplates[$ns] ) ) {
4745                         $this->mTemplates[$ns] = array();
4746                 }
4747                 $this->mTemplates[$ns][$dbk] = $id;
4748         }
4749
4750         /**
4751          * Return true if this cached output object predates the global or
4752          * per-article cache invalidation timestamps, or if it comes from
4753          * an incompatible older version.
4754          *
4755          * @param string $touched the affected article's last touched timestamp
4756          * @return bool
4757          * @public
4758          */
4759         function expired( $touched ) {
4760                 global $wgCacheEpoch;
4761                 return $this->getCacheTime() == -1 || // parser says it's uncacheable
4762                        $this->getCacheTime() < $touched ||
4763                        $this->getCacheTime() <= $wgCacheEpoch ||
4764                        !isset( $this->mVersion ) ||
4765                        version_compare( $this->mVersion, MW_PARSER_VERSION, "lt" );
4766         }
4767 }
4768
4769 /**
4770  * Set options of the Parser
4771  * @todo document
4772  * @package MediaWiki
4773  */
4774 class ParserOptions
4775 {
4776         # All variables are supposed to be private in theory, although in practise this is not the case.
4777         var $mUseTeX;                    # Use texvc to expand <math> tags
4778         var $mUseDynamicDates;           # Use DateFormatter to format dates
4779         var $mInterwikiMagic;            # Interlanguage links are removed and returned in an array
4780         var $mAllowExternalImages;       # Allow external images inline
4781         var $mAllowExternalImagesFrom;   # If not, any exception?
4782         var $mSkin;                      # Reference to the preferred skin
4783         var $mDateFormat;                # Date format index
4784         var $mEditSection;               # Create "edit section" links
4785         var $mNumberHeadings;            # Automatically number headings
4786         var $mAllowSpecialInclusion;     # Allow inclusion of special pages
4787         var $mTidy;                      # Ask for tidy cleanup
4788         var $mInterfaceMessage;          # Which lang to call for PLURAL and GRAMMAR
4789         var $mMaxIncludeSize;            # Maximum size of template expansions, in bytes
4790         var $mRemoveComments;            # Remove HTML comments. ONLY APPLIES TO PREPROCESS OPERATIONS
4791
4792         var $mUser;                      # Stored user object, just used to initialise the skin
4793
4794         function getUseTeX()                        { return $this->mUseTeX; }
4795         function getUseDynamicDates()               { return $this->mUseDynamicDates; }
4796         function getInterwikiMagic()                { return $this->mInterwikiMagic; }
4797         function getAllowExternalImages()           { return $this->mAllowExternalImages; }
4798         function getAllowExternalImagesFrom()       { return $this->mAllowExternalImagesFrom; }
4799         function getEditSection()                   { return $this->mEditSection; }
4800         function getNumberHeadings()                { return $this->mNumberHeadings; }
4801         function getAllowSpecialInclusion()         { return $this->mAllowSpecialInclusion; }
4802         function getTidy()                          { return $this->mTidy; }
4803         function getInterfaceMessage()              { return $this->mInterfaceMessage; }
4804         function getMaxIncludeSize()                { return $this->mMaxIncludeSize; }
4805         function getRemoveComments()                { return $this->mRemoveComments; }
4806
4807         function &getSkin() {
4808                 if ( !isset( $this->mSkin ) ) {
4809                         $this->mSkin = $this->mUser->getSkin();
4810                 }
4811                 return $this->mSkin;
4812         }
4813
4814         function getDateFormat() {
4815                 if ( !isset( $this->mDateFormat ) ) {
4816                         $this->mDateFormat = $this->mUser->getDatePreference();
4817                 }
4818                 return $this->mDateFormat;
4819         }
4820
4821         function setUseTeX( $x )                    { return wfSetVar( $this->mUseTeX, $x ); }
4822         function setUseDynamicDates( $x )           { return wfSetVar( $this->mUseDynamicDates, $x ); }
4823         function setInterwikiMagic( $x )            { return wfSetVar( $this->mInterwikiMagic, $x ); }
4824         function setAllowExternalImages( $x )       { return wfSetVar( $this->mAllowExternalImages, $x ); }
4825         function setAllowExternalImagesFrom( $x )   { return wfSetVar( $this->mAllowExternalImagesFrom, $x ); }
4826         function setDateFormat( $x )                { return wfSetVar( $this->mDateFormat, $x ); }
4827         function setEditSection( $x )               { return wfSetVar( $this->mEditSection, $x ); }
4828         function setNumberHeadings( $x )            { return wfSetVar( $this->mNumberHeadings, $x ); }
4829         function setAllowSpecialInclusion( $x )     { return wfSetVar( $this->mAllowSpecialInclusion, $x ); }
4830         function setTidy( $x )                      { return wfSetVar( $this->mTidy, $x); }
4831         function setSkin( $x )                      { $this->mSkin = $x; }
4832         function setInterfaceMessage( $x )          { return wfSetVar( $this->mInterfaceMessage, $x); }
4833         function setMaxIncludeSize( $x )            { return wfSetVar( $this->mMaxIncludeSize, $x ); }
4834         function setRemoveComments( $x )            { return wfSetVar( $this->mRemoveComments, $x ); }
4835
4836         function ParserOptions( $user = null ) {
4837                 $this->initialiseFromUser( $user );
4838         }
4839
4840         /**
4841          * Get parser options
4842          * @static
4843          */
4844         static function newFromUser( $user ) {
4845                 return new ParserOptions( $user );
4846         }
4847
4848         /** Get user options */
4849         function initialiseFromUser( $userInput ) {
4850                 global $wgUseTeX, $wgUseDynamicDates, $wgInterwikiMagic, $wgAllowExternalImages;
4851                 global $wgAllowExternalImagesFrom, $wgAllowSpecialInclusion, $wgMaxArticleSize;
4852                 $fname = 'ParserOptions::initialiseFromUser';
4853                 wfProfileIn( $fname );
4854                 if ( !$userInput ) {
4855                         global $wgUser;
4856                         if ( isset( $wgUser ) ) {
4857                                 $user = $wgUser;
4858                         } else {
4859                                 $user = new User;
4860                         }
4861                 } else {
4862                         $user =& $userInput;
4863                 }
4864
4865                 $this->mUser = $user;
4866
4867                 $this->mUseTeX = $wgUseTeX;
4868                 $this->mUseDynamicDates = $wgUseDynamicDates;
4869                 $this->mInterwikiMagic = $wgInterwikiMagic;
4870                 $this->mAllowExternalImages = $wgAllowExternalImages;
4871                 $this->mAllowExternalImagesFrom = $wgAllowExternalImagesFrom;
4872                 $this->mSkin = null; # Deferred
4873                 $this->mDateFormat = null; # Deferred
4874                 $this->mEditSection = true;
4875                 $this->mNumberHeadings = $user->getOption( 'numberheadings' );
4876                 $this->mAllowSpecialInclusion = $wgAllowSpecialInclusion;
4877                 $this->mTidy = false;
4878                 $this->mInterfaceMessage = false;
4879                 $this->mMaxIncludeSize = $wgMaxArticleSize * 1024;
4880                 $this->mRemoveComments = true;
4881                 wfProfileOut( $fname );
4882         }
4883 }
4884
4885 class OnlyIncludeReplacer {
4886         var $output = '';
4887
4888         function replace( $matches ) {
4889                 if ( substr( $matches[1], -1 ) == "\n" ) {
4890                         $this->output .= substr( $matches[1], 0, -1 );
4891                 } else {
4892                         $this->output .= $matches[1];
4893                 }
4894         }
4895 }
4896
4897 class StripState {
4898         var $general, $nowiki;
4899
4900         function __construct() {
4901                 $this->general = new ReplacementArray;
4902                 $this->nowiki = new ReplacementArray;
4903         }
4904
4905         function unstripGeneral( $text ) {
4906                 wfProfileIn( __METHOD__ );
4907                 $text = $this->general->replace( $text );
4908                 wfProfileOut( __METHOD__ );
4909                 return $text;
4910         }
4911
4912         function unstripNoWiki( $text ) {
4913                 wfProfileIn( __METHOD__ );
4914                 $text = $this->nowiki->replace( $text );
4915                 wfProfileOut( __METHOD__ );
4916                 return $text;
4917         }
4918
4919         function unstripBoth( $text ) {
4920                 wfProfileIn( __METHOD__ );
4921                 $text = $this->general->replace( $text );
4922                 $text = $this->nowiki->replace( $text );
4923                 wfProfileOut( __METHOD__ );
4924                 return $text;
4925         }
4926 }
4927
4928 ?>