includes/Parser.php

   1 <?php
   2 /**
   3  * File for Parser and related classes
   4  *
   5  * @addtogroup Parser
   6  */
   7
   8 /**
   9  * Update this version number when the ParserOutput format
  10  * changes in an incompatible way, so the parser cache
  11  * can automatically discard old data.
  12  */
  13 define( 'MW_PARSER_VERSION', '1.6.1' );
  14
  15 define( 'RLH_FOR_UPDATE', 1 );
  16
  17 # Allowed values for $mOutputType
  18 define( 'OT_HTML', 1 );
  19 define( 'OT_WIKI', 2 );
  20 define( 'OT_MSG' , 3 );
  21 define( 'OT_PREPROCESS', 4 );
  22
  23 # Flags for setFunctionHook
  24 define( 'SFH_NO_HASH', 1 );
  25
  26 # string parameter for extractTags which will cause it
  27 # to strip HTML comments in addition to regular
  28 # <XML>-style tags. This should not be anything we
  29 # may want to use in wikisyntax
  30 define( 'STRIP_COMMENTS', 'HTMLCommentStrip' );
  31
  32 # Constants needed for external link processing
  33 define( 'HTTP_PROTOCOLS', 'http:\/\/|https:\/\/' );
  34 # Everything except bracket, space, or control characters
  35 define( 'EXT_LINK_URL_CLASS', '[^][<>"\\x00-\\x20\\x7F]' );
  36 # Including space, but excluding newlines
  37 define( 'EXT_LINK_TEXT_CLASS', '[^\]\\x0a\\x0d]' );
  38 define( 'EXT_IMAGE_FNAME_CLASS', '[A-Za-z0-9_.,~%\\-+&;#*?!=()@\\x80-\\xFF]' );
  39 define( 'EXT_IMAGE_EXTENSIONS', 'gif|png|jpg|jpeg' );
  40 define( 'EXT_LINK_BRACKETED',  '/\[(\b(' . wfUrlProtocols() . ')'.
  41         EXT_LINK_URL_CLASS.'+) *('.EXT_LINK_TEXT_CLASS.'*?)\]/S' );
  42 define( 'EXT_IMAGE_REGEX',
  43         '/^('.HTTP_PROTOCOLS.')'.  # Protocol
  44         '('.EXT_LINK_URL_CLASS.'+)\\/'.  # Hostname and path
  45         '('.EXT_IMAGE_FNAME_CLASS.'+)\\.((?i)'.EXT_IMAGE_EXTENSIONS.')$/S' # Filename
  46 );
  47
  48 // State constants for the definition list colon extraction
  49 define( 'MW_COLON_STATE_TEXT', 0 );
  50 define( 'MW_COLON_STATE_TAG', 1 );
  51 define( 'MW_COLON_STATE_TAGSTART', 2 );
  52 define( 'MW_COLON_STATE_CLOSETAG', 3 );
  53 define( 'MW_COLON_STATE_TAGSLASH', 4 );
  54 define( 'MW_COLON_STATE_COMMENT', 5 );
  55 define( 'MW_COLON_STATE_COMMENTDASH', 6 );
  56 define( 'MW_COLON_STATE_COMMENTDASHDASH', 7 );
  57
  58 /**
  59  * PHP Parser - Processes wiki markup (which uses a more user-friendly
  60  * syntax, such as "[[link]]" for making links), and provides a one-way
  61  * transformation of that wiki markup it into XHTML output / markup
  62  * (which in turn the browser understands, and can display).
  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  */
  90 class Parser
  91 {
  92         const VERSION = MW_PARSER_VERSION;
  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, $mDefaultSort;
 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                 $this->setFunctionHook( 'defaultsort', array( 'CoreParserFunctions', 'defaultsort' ), SFH_NO_HASH );
 171
 172                 if ( $wgAllowDisplayTitle ) {
 173                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 174                 }
 175                 if ( $wgAllowSlowParserFunctions ) {
 176                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 177                 }
 178
 179                 $this->initialiseVariables();
 180                 $this->mFirstCall = false;
 181                 wfProfileOut( __METHOD__ );
 182         }
 183
 184         /**
 185          * Clear Parser state
 186          *
 187          * @private
 188          */
 189         function clearState() {
 190                 wfProfileIn( __METHOD__ );
 191                 if ( $this->mFirstCall ) {
 192                         $this->firstCallInit();
 193                 }
 194                 $this->mOutput = new ParserOutput;
 195                 $this->mAutonumber = 0;
 196                 $this->mLastSection = '';
 197                 $this->mDTopen = false;
 198                 $this->mIncludeCount = array();
 199                 $this->mStripState = new StripState;
 200                 $this->mArgStack = array();
 201                 $this->mInPre = false;
 202                 $this->mInterwikiLinkHolders = array(
 203                         'texts' => array(),
 204                         'titles' => array()
 205                 );
 206                 $this->mLinkHolders = array(
 207                         'namespaces' => array(),
 208                         'dbkeys' => array(),
 209                         'queries' => array(),
 210                         'texts' => array(),
 211                         'titles' => array()
 212                 );
 213                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 214
 215                 /**
 216                  * Prefix for temporary replacement strings for the multipass parser.
 217                  * \x07 should never appear in input as it's disallowed in XML.
 218                  * Using it at the front also gives us a little extra robustness
 219                  * since it shouldn't match when butted up against identifier-like
 220                  * string constructs.
 221                  */
 222                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 223
 224                 # Clear these on every parse, bug 4549
 225                 $this->mTemplates = array();
 226                 $this->mTemplatePath = array();
 227
 228                 $this->mShowToc = true;
 229                 $this->mForceTocPosition = false;
 230                 $this->mIncludeSizes = array(
 231                         'pre-expand' => 0,
 232                         'post-expand' => 0,
 233                         'arg' => 0
 234                 );
 235                 $this->mDefaultSort = false;
 236
 237                 wfRunHooks( 'ParserClearState', array( &$this ) );
 238                 wfProfileOut( __METHOD__ );
 239         }
 240
 241         function setOutputType( $ot ) {
 242                 $this->mOutputType = $ot;
 243                 // Shortcut alias
 244                 $this->ot = array(
 245                         'html' => $ot == OT_HTML,
 246                         'wiki' => $ot == OT_WIKI,
 247                         'msg' => $ot == OT_MSG,
 248                         'pre' => $ot == OT_PREPROCESS,
 249                 );
 250         }
 251
 252         /**
 253          * Accessor for mUniqPrefix.
 254          *
 255          * @public
 256          */
 257         function uniqPrefix() {
 258                 return $this->mUniqPrefix;
 259         }
 260
 261         /**
 262          * Convert wikitext to HTML
 263          * Do not call this function recursively.
 264          *
 265          * @param string $text Text we want to parse
 266          * @param Title &$title A title object
 267          * @param array $options
 268          * @param boolean $linestart
 269          * @param boolean $clearState
 270          * @param int $revid number to pass in {{REVISIONID}}
 271          * @return ParserOutput a ParserOutput
 272          */
 273         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 274                 /**
 275                  * First pass--just handle <nowiki> sections, pass the rest off
 276                  * to internalParse() which does all the real work.
 277                  */
 278
 279                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 280                 $fname = 'Parser::parse-' . wfGetCaller();
 281                 wfProfileIn( __METHOD__ );
 282                 wfProfileIn( $fname );
 283
 284                 if ( $clearState ) {
 285                         $this->clearState();
 286                 }
 287
 288                 $this->mOptions = $options;
 289                 $this->mTitle =& $title;
 290                 $oldRevisionId = $this->mRevisionId;
 291                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 292                 if( $revid !== null ) {
 293                         $this->mRevisionId = $revid;
 294                         $this->mRevisionTimestamp = null;
 295                 }
 296                 $this->setOutputType( OT_HTML );
 297                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 298                 $text = $this->strip( $text, $this->mStripState );
 299                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 300                 $text = $this->internalParse( $text );
 301                 $text = $this->mStripState->unstripGeneral( $text );
 302
 303                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 304                 $fixtags = array(
 305                         # french spaces, last one Guillemet-left
 306                         # only if there is something before the space
 307                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 308                         # french spaces, Guillemet-right
 309                         '/(\\302\\253) /' => '\\1&nbsp;',
 310                 );
 311                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 312
 313                 # only once and last
 314                 $text = $this->doBlockLevels( $text, $linestart );
 315
 316                 $this->replaceLinkHolders( $text );
 317
 318                 # the position of the parserConvert() call should not be changed. it
 319                 # assumes that the links are all replaced and the only thing left
 320                 # is the <nowiki> mark.
 321                 # Side-effects: this calls $this->mOutput->setTitleText()
 322                 $text = $wgContLang->parserConvert( $text, $this );
 323
 324                 $text = $this->mStripState->unstripNoWiki( $text );
 325
 326                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 327
 328                 $text = Sanitizer::normalizeCharReferences( $text );
 329
 330                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 331                         $text = Parser::tidy($text);
 332                 } else {
 333                         # attempt to sanitize at least some nesting problems
 334                         # (bug #2702 and quite a few others)
 335                         $tidyregs = array(
 336                                 # ''Something [http://www.cool.com cool''] -->
 337                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 338                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 339                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 340                                 # fix up an anchor inside another anchor, only
 341                                 # at least for a single single nested link (bug 3695)
 342                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 343                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 344                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 345                                 # contains a div, so fix it up here; replace
 346                                 # div with escaped text
 347                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 348                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 349                                 # remove empty italic or bold tag pairs, some
 350                                 # introduced by rules above
 351                                 '/<([bi])><\/\\1>/' => '',
 352                         );
 353
 354                         $text = preg_replace(
 355                                 array_keys( $tidyregs ),
 356                                 array_values( $tidyregs ),
 357                                 $text );
 358                 }
 359
 360                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 361
 362                 # Information on include size limits, for the benefit of users who try to skirt them
 363                 if ( max( $this->mIncludeSizes ) > 1000 ) {
 364                         $max = $this->mOptions->getMaxIncludeSize();
 365                         $text .= "<!-- \n" .
 366                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']} bytes\n" .
 367                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']} bytes\n" .
 368                                 "Template argument size: {$this->mIncludeSizes['arg']} bytes\n" .
 369                                 "Maximum: $max bytes\n" .
 370                                 "-->\n";
 371                 }
 372                 $this->mOutput->setText( $text );
 373                 $this->mRevisionId = $oldRevisionId;
 374                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 375                 wfProfileOut( $fname );
 376                 wfProfileOut( __METHOD__ );
 377
 378                 return $this->mOutput;
 379         }
 380
 381         /**
 382          * Recursive parser entry point that can be called from an extension tag
 383          * hook.
 384          */
 385         function recursiveTagParse( $text ) {
 386                 wfProfileIn( __METHOD__ );
 387                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 388                 $text = $this->strip( $text, $this->mStripState );
 389                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 390                 $text = $this->internalParse( $text );
 391                 wfProfileOut( __METHOD__ );
 392                 return $text;
 393         }
 394
 395         /**
 396          * Expand templates and variables in the text, producing valid, static wikitext.
 397          * Also removes comments.
 398          */
 399         function preprocess( $text, $title, $options ) {
 400                 wfProfileIn( __METHOD__ );
 401                 $this->clearState();
 402                 $this->setOutputType( OT_PREPROCESS );
 403                 $this->mOptions = $options;
 404                 $this->mTitle = $title;
 405                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 406                 $text = $this->strip( $text, $this->mStripState );
 407                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 408                 if ( $this->mOptions->getRemoveComments() ) {
 409                         $text = Sanitizer::removeHTMLcomments( $text );
 410                 }
 411                 $text = $this->replaceVariables( $text );
 412                 $text = $this->mStripState->unstripBoth( $text );
 413                 wfProfileOut( __METHOD__ );
 414                 return $text;
 415         }
 416
 417         /**
 418          * Get a random string
 419          *
 420          * @private
 421          * @static
 422          */
 423         function getRandomString() {
 424                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 425         }
 426
 427         function &getTitle() { return $this->mTitle; }
 428         function getOptions() { return $this->mOptions; }
 429
 430         function getFunctionLang() {
 431                 global $wgLang, $wgContLang;
 432                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 433         }
 434
 435         /**
 436          * Replaces all occurrences of HTML-style comments and the given tags
 437          * in the text with a random marker and returns teh next text. The output
 438          * parameter $matches will be an associative array filled with data in
 439          * the form:
 440          *   'UNIQ-xxxxx' => array(
 441          *     'element',
 442          *     'tag content',
 443          *     array( 'param' => 'x' ),
 444          *     '<element param="x">tag content</element>' ) )
 445          *
 446          * @param $elements list of element names. Comments are always extracted.
 447          * @param $text Source text string.
 448          * @param $uniq_prefix
 449          *
 450          * @private
 451          * @static
 452          */
 453         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 454                 static $n = 1;
 455                 $stripped = '';
 456                 $matches = array();
 457
 458                 $taglist = implode( '|', $elements );
 459                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 460
 461                 while ( '' != $text ) {
 462                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 463                         $stripped .= $p[0];
 464                         if( count( $p ) < 5 ) {
 465                                 break;
 466                         }
 467                         if( count( $p ) > 5 ) {
 468                                 // comment
 469                                 $element    = $p[4];
 470                                 $attributes = '';
 471                                 $close      = '';
 472                                 $inside     = $p[5];
 473                         } else {
 474                                 // tag
 475                                 $element    = $p[1];
 476                                 $attributes = $p[2];
 477                                 $close      = $p[3];
 478                                 $inside     = $p[4];
 479                         }
 480
 481                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . '-QINU';
 482                         $stripped .= $marker;
 483
 484                         if ( $close === '/>' ) {
 485                                 // Empty element tag, <tag />
 486                                 $content = null;
 487                                 $text = $inside;
 488                                 $tail = null;
 489                         } else {
 490                                 if( $element == '!--' ) {
 491                                         $end = '/(-->)/';
 492                                 } else {
 493                                         $end = "/(<\\/$element\\s*>)/i";
 494                                 }
 495                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 496                                 $content = $q[0];
 497                                 if( count( $q ) < 3 ) {
 498                                         # No end tag -- let it run out to the end of the text.
 499                                         $tail = '';
 500                                         $text = '';
 501                                 } else {
 502                                         $tail = $q[1];
 503                                         $text = $q[2];
 504                                 }
 505                         }
 506
 507                         $matches[$marker] = array( $element,
 508                                 $content,
 509                                 Sanitizer::decodeTagAttributes( $attributes ),
 510                                 "<$element$attributes$close$content$tail" );
 511                 }
 512                 return $stripped;
 513         }
 514
 515         /**
 516          * Strips and renders nowiki, pre, math, hiero
 517          * If $render is set, performs necessary rendering operations on plugins
 518          * Returns the text, and fills an array with data needed in unstrip()
 519          *
 520          * @param StripState $state
 521          *
 522          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 523          *  will be stripped in addition to other tags. This is important
 524          *  for section editing, where these comments cause confusion when
 525          *  counting the sections in the wikisource
 526          *
 527          * @param array dontstrip contains tags which should not be stripped;
 528          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 529          *
 530          * @private
 531          */
 532         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 533                 global $wgContLang;
 534                 wfProfileIn( __METHOD__ );
 535                 $render = ($this->mOutputType == OT_HTML);
 536
 537                 $uniq_prefix = $this->mUniqPrefix;
 538                 $commentState = new ReplacementArray;
 539                 $nowikiItems = array();
 540                 $generalItems = array();
 541
 542                 $elements = array_merge(
 543                         array( 'nowiki', 'gallery' ),
 544                         array_keys( $this->mTagHooks ) );
 545                 global $wgRawHtml;
 546                 if( $wgRawHtml ) {
 547                         $elements[] = 'html';
 548                 }
 549                 if( $this->mOptions->getUseTeX() ) {
 550                         $elements[] = 'math';
 551                 }
 552
 553                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 554                 foreach ( $elements AS $k => $v ) {
 555                         if ( !in_array ( $v , $dontstrip ) ) continue;
 556                         unset ( $elements[$k] );
 557                 }
 558
 559                 $matches = array();
 560                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 561
 562                 foreach( $matches as $marker => $data ) {
 563                         list( $element, $content, $params, $tag ) = $data;
 564                         if( $render ) {
 565                                 $tagName = strtolower( $element );
 566                                 wfProfileIn( __METHOD__."-render-$tagName" );
 567                                 switch( $tagName ) {
 568                                 case '!--':
 569                                         // Comment
 570                                         if( substr( $tag, -3 ) == '-->' ) {
 571                                                 $output = $tag;
 572                                         } else {
 573                                                 // Unclosed comment in input.
 574                                                 // Close it so later stripping can remove it
 575                                                 $output = "$tag-->";
 576                                         }
 577                                         break;
 578                                 case 'html':
 579                                         if( $wgRawHtml ) {
 580                                                 $output = $content;
 581                                                 break;
 582                                         }
 583                                         // Shouldn't happen otherwise. :)
 584                                 case 'nowiki':
 585                                         $output = Xml::escapeTagsOnly( $content );
 586                                         break;
 587                                 case 'math':
 588                                         $output = $wgContLang->armourMath( MathRenderer::renderMath( $content ) );
 589                                         break;
 590                                 case 'gallery':
 591                                         $output = $this->renderImageGallery( $content, $params );
 592                                         break;
 593                                 default:
 594                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 595                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 596                                                         array( $content, $params, $this ) );
 597                                         } else {
 598                                                 throw new MWException( "Invalid call hook $element" );
 599                                         }
 600                                 }
 601                                 wfProfileOut( __METHOD__."-render-$tagName" );
 602                         } else {
 603                                 // Just stripping tags; keep the source
 604                                 $output = $tag;
 605                         }
 606
 607                         // Unstrip the output, to support recursive strip() calls
 608                         $output = $state->unstripBoth( $output );
 609
 610                         if( !$stripcomments && $element == '!--' ) {
 611                                 $commentState->setPair( $marker, $output );
 612                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 613                                 $nowikiItems[$marker] = $output;
 614                         } else {
 615                                 $generalItems[$marker] = $output;
 616                         }
 617                 }
 618                 # Add the new items to the state
 619                 # We do this after the loop instead of during it to avoid slowing
 620                 # down the recursive unstrip
 621                 $state->nowiki->mergeArray( $nowikiItems );
 622                 $state->general->mergeArray( $generalItems );
 623
 624                 # Unstrip comments unless explicitly told otherwise.
 625                 # (The comments are always stripped prior to this point, so as to
 626                 # not invoke any extension tags / parser hooks contained within
 627                 # a comment.)
 628                 if ( !$stripcomments ) {
 629                         // Put them all back and forget them
 630                         $text = $commentState->replace( $text );
 631                 }
 632
 633                 wfProfileOut( __METHOD__ );
 634                 return $text;
 635         }
 636
 637         /**
 638          * Restores pre, math, and other extensions removed by strip()
 639          *
 640          * always call unstripNoWiki() after this one
 641          * @private
 642          * @deprecated use $this->mStripState->unstrip()
 643          */
 644         function unstrip( $text, $state ) {
 645                 return $state->unstripGeneral( $text );
 646         }
 647
 648         /**
 649          * Always call this after unstrip() to preserve the order
 650          *
 651          * @private
 652          * @deprecated use $this->mStripState->unstrip()
 653          */
 654         function unstripNoWiki( $text, $state ) {
 655                 return $state->unstripNoWiki( $text );
 656         }
 657
 658         /**
 659          * @deprecated use $this->mStripState->unstripBoth()
 660          */
 661         function unstripForHTML( $text ) {
 662                 return $this->mStripState->unstripBoth( $text );
 663         }
 664
 665         /**
 666          * Add an item to the strip state
 667          * Returns the unique tag which must be inserted into the stripped text
 668          * The tag will be replaced with the original text in unstrip()
 669          *
 670          * @private
 671          */
 672         function insertStripItem( $text, &$state ) {
 673                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 674                 $state->general->setPair( $rnd, $text );
 675                 return $rnd;
 676         }
 677
 678         /**
 679          * Interface with html tidy, used if $wgUseTidy = true.
 680          * If tidy isn't able to correct the markup, the original will be
 681          * returned in all its glory with a warning comment appended.
 682          *
 683          * Either the external tidy program or the in-process tidy extension
 684          * will be used depending on availability. Override the default
 685          * $wgTidyInternal setting to disable the internal if it's not working.
 686          *
 687          * @param string $text Hideous HTML input
 688          * @return string Corrected HTML output
 689          * @public
 690          * @static
 691          */
 692         function tidy( $text ) {
 693                 global $wgTidyInternal;
 694                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 695 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 696 '<head><title>test</title></head><body>'.$text.'</body></html>';
 697                 if( $wgTidyInternal ) {
 698                         $correctedtext = Parser::internalTidy( $wrappedtext );
 699                 } else {
 700                         $correctedtext = Parser::externalTidy( $wrappedtext );
 701                 }
 702                 if( is_null( $correctedtext ) ) {
 703                         wfDebug( "Tidy error detected!\n" );
 704                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 705                 }
 706                 return $correctedtext;
 707         }
 708
 709         /**
 710          * Spawn an external HTML tidy process and get corrected markup back from it.
 711          *
 712          * @private
 713          * @static
 714          */
 715         function externalTidy( $text ) {
 716                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 717                 $fname = 'Parser::externalTidy';
 718                 wfProfileIn( $fname );
 719
 720                 $cleansource = '';
 721                 $opts = ' -utf8';
 722
 723                 $descriptorspec = array(
 724                         0 => array('pipe', 'r'),
 725                         1 => array('pipe', 'w'),
 726                         2 => array('file', '/dev/null', 'a')  // FIXME: this line in UNIX-specific, it generates a warning on Windows, because /dev/null is not a valid Windows file.
 727                 );
 728                 $pipes = array();
 729                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 730                 if (is_resource($process)) {
 731                         // Theoretically, this style of communication could cause a deadlock
 732                         // here. If the stdout buffer fills up, then writes to stdin could
 733                         // block. This doesn't appear to happen with tidy, because tidy only
 734                         // writes to stdout after it's finished reading from stdin. Search
 735                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 736                         fwrite($pipes[0], $text);
 737                         fclose($pipes[0]);
 738                         while (!feof($pipes[1])) {
 739                                 $cleansource .= fgets($pipes[1], 1024);
 740                         }
 741                         fclose($pipes[1]);
 742                         proc_close($process);
 743                 }
 744
 745                 wfProfileOut( $fname );
 746
 747                 if( $cleansource == '' && $text != '') {
 748                         // Some kind of error happened, so we couldn't get the corrected text.
 749                         // Just give up; we'll use the source text and append a warning.
 750                         return null;
 751                 } else {
 752                         return $cleansource;
 753                 }
 754         }
 755
 756         /**
 757          * Use the HTML tidy PECL extension to use the tidy library in-process,
 758          * saving the overhead of spawning a new process. Currently written to
 759          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 760          *
 761          * 'pear install tidy' should be able to compile the extension module.
 762          *
 763          * @private
 764          * @static
 765          */
 766         function internalTidy( $text ) {
 767                 global $wgTidyConf;
 768                 $fname = 'Parser::internalTidy';
 769                 wfProfileIn( $fname );
 770
 771                 tidy_load_config( $wgTidyConf );
 772                 tidy_set_encoding( 'utf8' );
 773                 tidy_parse_string( $text );
 774                 tidy_clean_repair();
 775                 if( tidy_get_status() == 2 ) {
 776                         // 2 is magic number for fatal error
 777                         // http://www.php.net/manual/en/function.tidy-get-status.php
 778                         $cleansource = null;
 779                 } else {
 780                         $cleansource = tidy_get_output();
 781                 }
 782                 wfProfileOut( $fname );
 783                 return $cleansource;
 784         }
 785
 786         /**
 787          * parse the wiki syntax used to render tables
 788          *
 789          * @private
 790          */
 791         function doTableStuff ( $text ) {
 792                 $fname = 'Parser::doTableStuff';
 793                 wfProfileIn( $fname );
 794
 795                 $lines = explode ( "\n" , $text );
 796                 $td_history = array (); // Is currently a td tag open?
 797                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 798                 $tr_history = array (); // Is currently a tr tag open?
 799                 $tr_attributes = array (); // history of tr attributes
 800                 $has_opened_tr = array(); // Did this table open a <tr> element?
 801                 $indent_level = 0; // indent level of the table
 802                 foreach ( $lines as $key => $line )
 803                 {
 804                         $line = trim ( $line );
 805
 806                         if( $line == '' ) { // empty line, go to next line
 807                                 continue;
 808                         }
 809                         $first_character = $line{0};
 810                         $matches = array();
 811
 812                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 813                                 // First check if we are starting a new table
 814                                 $indent_level = strlen( $matches[1] );
 815
 816                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 817                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 818
 819                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 820                                 array_push ( $td_history , false );
 821                                 array_push ( $last_tag_history , '' );
 822                                 array_push ( $tr_history , false );
 823                                 array_push ( $tr_attributes , '' );
 824                                 array_push ( $has_opened_tr , false );
 825                         } else if ( count ( $td_history ) == 0 ) {
 826                                 // Don't do any of the following
 827                                 continue;
 828                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 829                                 // We are ending a table
 830                                 $line = '</table>' . substr ( $line , 2 );
 831                                 $last_tag = array_pop ( $last_tag_history );
 832
 833                                 if ( !array_pop ( $has_opened_tr ) ) {
 834                                         $line = "<tr><td></td></tr>{$line}";
 835                                 }
 836
 837                                 if ( array_pop ( $tr_history ) ) {
 838                                         $line = "</tr>{$line}";
 839                                 }
 840
 841                                 if ( array_pop ( $td_history ) ) {
 842                                         $line = "</{$last_tag}>{$line}";
 843                                 }
 844                                 array_pop ( $tr_attributes );
 845                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 846                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 847                                 // Now we have a table row
 848                                 $line = preg_replace( '#^\|-+#', '', $line );
 849
 850                                 // Whats after the tag is now only attributes
 851                                 $attributes = $this->mStripState->unstripBoth( $line );
 852                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 853                                 array_pop ( $tr_attributes );
 854                                 array_push ( $tr_attributes , $attributes );
 855
 856                                 $line = '';
 857                                 $last_tag = array_pop ( $last_tag_history );
 858                                 array_pop ( $has_opened_tr );
 859                                 array_push ( $has_opened_tr , true );
 860
 861                                 if ( array_pop ( $tr_history ) ) {
 862                                         $line = '</tr>';
 863                                 }
 864
 865                                 if ( array_pop ( $td_history ) ) {
 866                                         $line = "</{$last_tag}>{$line}";
 867                                 }
 868
 869                                 $lines[$key] = $line;
 870                                 array_push ( $tr_history , false );
 871                                 array_push ( $td_history , false );
 872                                 array_push ( $last_tag_history , '' );
 873                         }
 874                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 875                                 // This might be cell elements, td, th or captions
 876                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 877                                         $first_character = '+';
 878                                         $line = substr ( $line , 1 );
 879                                 }
 880
 881                                 $line = substr ( $line , 1 );
 882
 883                                 if ( $first_character == '!' ) {
 884                                         $line = str_replace ( '!!' , '||' , $line );
 885                                 }
 886
 887                                 // Split up multiple cells on the same line.
 888                                 // FIXME : This can result in improper nesting of tags processed
 889                                 // by earlier parser steps, but should avoid splitting up eg
 890                                 // attribute values containing literal "||".
 891                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 892
 893                                 $lines[$key] = '';
 894
 895                                 // Loop through each table cell
 896                                 foreach ( $cells as $cell )
 897                                 {
 898                                         $previous = '';
 899                                         if ( $first_character != '+' )
 900                                         {
 901                                                 $tr_after = array_pop ( $tr_attributes );
 902                                                 if ( !array_pop ( $tr_history ) ) {
 903                                                         $previous = "<tr{$tr_after}>\n";
 904                                                 }
 905                                                 array_push ( $tr_history , true );
 906                                                 array_push ( $tr_attributes , '' );
 907                                                 array_pop ( $has_opened_tr );
 908                                                 array_push ( $has_opened_tr , true );
 909                                         }
 910
 911                                         $last_tag = array_pop ( $last_tag_history );
 912
 913                                         if ( array_pop ( $td_history ) ) {
 914                                                 $previous = "</{$last_tag}>{$previous}";
 915                                         }
 916
 917                                         if ( $first_character == '|' ) {
 918                                                 $last_tag = 'td';
 919                                         } else if ( $first_character == '!' ) {
 920                                                 $last_tag = 'th';
 921                                         } else if ( $first_character == '+' ) {
 922                                                 $last_tag = 'caption';
 923                                         } else {
 924                                                 $last_tag = '';
 925                                         }
 926
 927                                         array_push ( $last_tag_history , $last_tag );
 928
 929                                         // A cell could contain both parameters and data
 930                                         $cell_data = explode ( '|' , $cell , 2 );
 931
 932                                         // Bug 553: Note that a '|' inside an invalid link should not
 933                                         // be mistaken as delimiting cell parameters
 934                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 935                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 936                                         } else if ( count ( $cell_data ) == 1 )
 937                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 938                                         else {
 939                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 940                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 941                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 942                                         }
 943
 944                                         $lines[$key] .= $cell;
 945                                         array_push ( $td_history , true );
 946                                 }
 947                         }
 948                 }
 949
 950                 // Closing open td, tr && table
 951                 while ( count ( $td_history ) > 0 )
 952                 {
 953                         if ( array_pop ( $td_history ) ) {
 954                                 $lines[] = '</td>' ;
 955                         }
 956                         if ( array_pop ( $tr_history ) ) {
 957                                 $lines[] = '</tr>' ;
 958                         }
 959                         if ( !array_pop ( $has_opened_tr ) ) {
 960                                 $lines[] = "<tr><td></td></tr>" ;
 961                         }
 962
 963                         $lines[] = '</table>' ;
 964                 }
 965
 966                 $output = implode ( "\n" , $lines ) ;
 967
 968                 // special case: don't return empty table
 969                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 970                         $output = '';
 971                 }
 972
 973                 wfProfileOut( $fname );
 974
 975                 return $output;
 976         }
 977
 978         /**
 979          * Helper function for parse() that transforms wiki markup into
 980          * HTML. Only called for $mOutputType == OT_HTML.
 981          *
 982          * @private
 983          */
 984         function internalParse( $text ) {
 985                 $args = array();
 986                 $isMain = true;
 987                 $fname = 'Parser::internalParse';
 988                 wfProfileIn( $fname );
 989
 990                 # Hook to suspend the parser in this state
 991                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 992                         wfProfileOut( $fname );
 993                         return $text ;
 994                 }
 995
 996                 # Remove <noinclude> tags and <includeonly> sections
 997                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
 998                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
 999                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
1000
1001                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
1002
1003                 $text = $this->replaceVariables( $text, $args );
1004                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text ) );
1005
1006                 // Tables need to come after variable replacement for things to work
1007                 // properly; putting them before other transformations should keep
1008                 // exciting things like link expansions from showing up in surprising
1009                 // places.
1010                 $text = $this->doTableStuff( $text );
1011
1012                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1013
1014                 $text = $this->stripToc( $text );
1015                 $this->stripNoGallery( $text );
1016                 $text = $this->doHeadings( $text );
1017                 if($this->mOptions->getUseDynamicDates()) {
1018                         $df =& DateFormatter::getInstance();
1019                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1020                 }
1021                 $text = $this->doAllQuotes( $text );
1022                 $text = $this->replaceInternalLinks( $text );
1023                 $text = $this->replaceExternalLinks( $text );
1024
1025                 # replaceInternalLinks may sometimes leave behind
1026                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1027                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1028
1029                 $text = $this->doMagicLinks( $text );
1030                 $text = $this->formatHeadings( $text, $isMain );
1031
1032                 wfProfileOut( $fname );
1033                 return $text;
1034         }
1035
1036         /**
1037          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1038          * magic external links.
1039          *
1040          * @private
1041          */
1042         function &doMagicLinks( &$text ) {
1043                 wfProfileIn( __METHOD__ );
1044                 $text = preg_replace_callback(
1045                         '!(?:                           # Start cases
1046                             <a.*?</a> |                 # Skip link text
1047                             <.*?> |                     # Skip stuff inside HTML elements
1048                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1049                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1050                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1051                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1052                                      [0-9Xx]                 # check digit
1053                                    \b)
1054                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1055                 wfProfileOut( __METHOD__ );
1056                 return $text;
1057         }
1058
1059         function magicLinkCallback( $m ) {
1060                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1061                         # Skip HTML element
1062                         return $m[0];
1063                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1064                         $isbn = $m[2];
1065                         $num = strtr( $isbn, array(
1066                                 '-' => '',
1067                                 ' ' => '',
1068                                 'x' => 'X',
1069                         ));
1070                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1071                         $text = '<a href="' .
1072                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1073                                 "\" class=\"internal\">ISBN $isbn</a>";
1074                 } else {
1075                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1076                                 $keyword = 'RFC';
1077                                 $urlmsg = 'rfcurl';
1078                                 $id = $m[1];
1079                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1080                                 $keyword = 'PMID';
1081                                 $urlmsg = 'pubmedurl';
1082                                 $id = $m[1];
1083                         } else {
1084                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1085                                         substr($m[0], 0, 20 ) . '"' );
1086                         }
1087
1088                         $url = wfMsg( $urlmsg, $id);
1089                         $sk = $this->mOptions->getSkin();
1090                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1091                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1092                 }
1093                 return $text;
1094         }
1095
1096         /**
1097          * Parse headers and return html
1098          *
1099          * @private
1100          */
1101         function doHeadings( $text ) {
1102                 $fname = 'Parser::doHeadings';
1103                 wfProfileIn( $fname );
1104                 for ( $i = 6; $i >= 1; --$i ) {
1105                         $h = str_repeat( '=', $i );
1106                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1107                           "<h{$i}>\\1</h{$i}>\\2", $text );
1108                 }
1109                 wfProfileOut( $fname );
1110                 return $text;
1111         }
1112
1113         /**
1114          * Replace single quotes with HTML markup
1115          * @private
1116          * @return string the altered text
1117          */
1118         function doAllQuotes( $text ) {
1119                 $fname = 'Parser::doAllQuotes';
1120                 wfProfileIn( $fname );
1121                 $outtext = '';
1122                 $lines = explode( "\n", $text );
1123                 foreach ( $lines as $line ) {
1124                         $outtext .= $this->doQuotes ( $line ) . "\n";
1125                 }
1126                 $outtext = substr($outtext, 0,-1);
1127                 wfProfileOut( $fname );
1128                 return $outtext;
1129         }
1130
1131         /**
1132          * Helper function for doAllQuotes()
1133          * @private
1134          */
1135         function doQuotes( $text ) {
1136                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1137                 if ( count( $arr ) == 1 )
1138                         return $text;
1139                 else
1140                 {
1141                         # First, do some preliminary work. This may shift some apostrophes from
1142                         # being mark-up to being text. It also counts the number of occurrences
1143                         # of bold and italics mark-ups.
1144                         $i = 0;
1145                         $numbold = 0;
1146                         $numitalics = 0;
1147                         foreach ( $arr as $r )
1148                         {
1149                                 if ( ( $i % 2 ) == 1 )
1150                                 {
1151                                         # If there are ever four apostrophes, assume the first is supposed to
1152                                         # be text, and the remaining three constitute mark-up for bold text.
1153                                         if ( strlen( $arr[$i] ) == 4 )
1154                                         {
1155                                                 $arr[$i-1] .= "'";
1156                                                 $arr[$i] = "'''";
1157                                         }
1158                                         # If there are more than 5 apostrophes in a row, assume they're all
1159                                         # text except for the last 5.
1160                                         else if ( strlen( $arr[$i] ) > 5 )
1161                                         {
1162                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1163                                                 $arr[$i] = "'''''";
1164                                         }
1165                                         # Count the number of occurrences of bold and italics mark-ups.
1166                                         # We are not counting sequences of five apostrophes.
1167                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1168                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1169                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1170                                 }
1171                                 $i++;
1172                         }
1173
1174                         # If there is an odd number of both bold and italics, it is likely
1175                         # that one of the bold ones was meant to be an apostrophe followed
1176                         # by italics. Which one we cannot know for certain, but it is more
1177                         # likely to be one that has a single-letter word before it.
1178                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1179                         {
1180                                 $i = 0;
1181                                 $firstsingleletterword = -1;
1182                                 $firstmultiletterword = -1;
1183                                 $firstspace = -1;
1184                                 foreach ( $arr as $r )
1185                                 {
1186                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1187                                         {
1188                                                 $x1 = substr ($arr[$i-1], -1);
1189                                                 $x2 = substr ($arr[$i-1], -2, 1);
1190                                                 if ($x1 == ' ') {
1191                                                         if ($firstspace == -1) $firstspace = $i;
1192                                                 } else if ($x2 == ' ') {
1193                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1194                                                 } else {
1195                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1196                                                 }
1197                                         }
1198                                         $i++;
1199                                 }
1200
1201                                 # If there is a single-letter word, use it!
1202                                 if ($firstsingleletterword > -1)
1203                                 {
1204                                         $arr [ $firstsingleletterword ] = "''";
1205                                         $arr [ $firstsingleletterword-1 ] .= "'";
1206                                 }
1207                                 # If not, but there's a multi-letter word, use that one.
1208                                 else if ($firstmultiletterword > -1)
1209                                 {
1210                                         $arr [ $firstmultiletterword ] = "''";
1211                                         $arr [ $firstmultiletterword-1 ] .= "'";
1212                                 }
1213                                 # ... otherwise use the first one that has neither.
1214                                 # (notice that it is possible for all three to be -1 if, for example,
1215                                 # there is only one pentuple-apostrophe in the line)
1216                                 else if ($firstspace > -1)
1217                                 {
1218                                         $arr [ $firstspace ] = "''";
1219                                         $arr [ $firstspace-1 ] .= "'";
1220                                 }
1221                         }
1222
1223                         # Now let's actually convert our apostrophic mush to HTML!
1224                         $output = '';
1225                         $buffer = '';
1226                         $state = '';
1227                         $i = 0;
1228                         foreach ($arr as $r)
1229                         {
1230                                 if (($i % 2) == 0)
1231                                 {
1232                                         if ($state == 'both')
1233                                                 $buffer .= $r;
1234                                         else
1235                                                 $output .= $r;
1236                                 }
1237                                 else
1238                                 {
1239                                         if (strlen ($r) == 2)
1240                                         {
1241                                                 if ($state == 'i')
1242                                                 { $output .= '</i>'; $state = ''; }
1243                                                 else if ($state == 'bi')
1244                                                 { $output .= '</i>'; $state = 'b'; }
1245                                                 else if ($state == 'ib')
1246                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1247                                                 else if ($state == 'both')
1248                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1249                                                 else # $state can be 'b' or ''
1250                                                 { $output .= '<i>'; $state .= 'i'; }
1251                                         }
1252                                         else if (strlen ($r) == 3)
1253                                         {
1254                                                 if ($state == 'b')
1255                                                 { $output .= '</b>'; $state = ''; }
1256                                                 else if ($state == 'bi')
1257                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1258                                                 else if ($state == 'ib')
1259                                                 { $output .= '</b>'; $state = 'i'; }
1260                                                 else if ($state == 'both')
1261                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1262                                                 else # $state can be 'i' or ''
1263                                                 { $output .= '<b>'; $state .= 'b'; }
1264                                         }
1265                                         else if (strlen ($r) == 5)
1266                                         {
1267                                                 if ($state == 'b')
1268                                                 { $output .= '</b><i>'; $state = 'i'; }
1269                                                 else if ($state == 'i')
1270                                                 { $output .= '</i><b>'; $state = 'b'; }
1271                                                 else if ($state == 'bi')
1272                                                 { $output .= '</i></b>'; $state = ''; }
1273                                                 else if ($state == 'ib')
1274                                                 { $output .= '</b></i>'; $state = ''; }
1275                                                 else if ($state == 'both')
1276                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1277                                                 else # ($state == '')
1278                                                 { $buffer = ''; $state = 'both'; }
1279                                         }
1280                                 }
1281                                 $i++;
1282                         }
1283                         # Now close all remaining tags.  Notice that the order is important.
1284                         if ($state == 'b' || $state == 'ib')
1285                                 $output .= '</b>';
1286                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1287                                 $output .= '</i>';
1288                         if ($state == 'bi')
1289                                 $output .= '</b>';
1290                         # There might be lonely ''''', so make sure we have a buffer
1291                         if ($state == 'both' && $buffer)
1292                                 $output .= '<b><i>'.$buffer.'</i></b>';
1293                         return $output;
1294                 }
1295         }
1296
1297         /**
1298          * Replace external links
1299          *
1300          * Note: this is all very hackish and the order of execution matters a lot.
1301          * Make sure to run maintenance/parserTests.php if you change this code.
1302          *
1303          * @private
1304          */
1305         function replaceExternalLinks( $text ) {
1306                 global $wgContLang;
1307                 $fname = 'Parser::replaceExternalLinks';
1308                 wfProfileIn( $fname );
1309
1310                 $sk = $this->mOptions->getSkin();
1311
1312                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1313
1314                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1315
1316                 $i = 0;
1317                 while ( $i<count( $bits ) ) {
1318                         $url = $bits[$i++];
1319                         $protocol = $bits[$i++];
1320                         $text = $bits[$i++];
1321                         $trail = $bits[$i++];
1322
1323                         # The characters '<' and '>' (which were escaped by
1324                         # removeHTMLtags()) should not be included in
1325                         # URLs, per RFC 2396.
1326                         $m2 = array();
1327                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1328                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1329                                 $url = substr($url, 0, $m2[0][1]);
1330                         }
1331
1332                         # If the link text is an image URL, replace it with an <img> tag
1333                         # This happened by accident in the original parser, but some people used it extensively
1334                         $img = $this->maybeMakeExternalImage( $text );
1335                         if ( $img !== false ) {
1336                                 $text = $img;
1337                         }
1338
1339                         $dtrail = '';
1340
1341                         # Set linktype for CSS - if URL==text, link is essentially free
1342                         $linktype = ($text == $url) ? 'free' : 'text';
1343
1344                         # No link text, e.g. [http://domain.tld/some.link]
1345                         if ( $text == '' ) {
1346                                 # Autonumber if allowed. See bug #5918
1347                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1348                                         $text = '[' . ++$this->mAutonumber . ']';
1349                                         $linktype = 'autonumber';
1350                                 } else {
1351                                         # Otherwise just use the URL
1352                                         $text = htmlspecialchars( $url );
1353                                         $linktype = 'free';
1354                                 }
1355                         } else {
1356                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1357                                 # Check for trail
1358                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1359                         }
1360
1361                         $text = $wgContLang->markNoConversion($text);
1362
1363                         $url = Sanitizer::cleanUrl( $url );
1364
1365                         # Process the trail (i.e. everything after this link up until start of the next link),
1366                         # replacing any non-bracketed links
1367                         $trail = $this->replaceFreeExternalLinks( $trail );
1368
1369                         # Use the encoded URL
1370                         # This means that users can paste URLs directly into the text
1371                         # Funny characters like &ouml; aren't valid in URLs anyway
1372                         # This was changed in August 2004
1373                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1374
1375                         # Register link in the output object.
1376                         # Replace unnecessary URL escape codes with the referenced character
1377                         # This prevents spammers from hiding links from the filters
1378                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1379                         $this->mOutput->addExternalLink( $pasteurized );
1380                 }
1381
1382                 wfProfileOut( $fname );
1383                 return $s;
1384         }
1385
1386         /**
1387          * Replace anything that looks like a URL with a link
1388          * @private
1389          */
1390         function replaceFreeExternalLinks( $text ) {
1391                 global $wgContLang;
1392                 $fname = 'Parser::replaceFreeExternalLinks';
1393                 wfProfileIn( $fname );
1394
1395                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1396                 $s = array_shift( $bits );
1397                 $i = 0;
1398
1399                 $sk = $this->mOptions->getSkin();
1400
1401                 while ( $i < count( $bits ) ){
1402                         $protocol = $bits[$i++];
1403                         $remainder = $bits[$i++];
1404
1405                         $m = array();
1406                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1407                                 # Found some characters after the protocol that look promising
1408                                 $url = $protocol . $m[1];
1409                                 $trail = $m[2];
1410
1411                                 # special case: handle urls as url args:
1412                                 # http://www.example.com/foo?=http://www.example.com/bar
1413                                 if(strlen($trail) == 0 &&
1414                                         isset($bits[$i]) &&
1415                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1416                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1417                                 {
1418                                         # add protocol, arg
1419                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1420                                         $i += 2;
1421                                         $trail = $m[2];
1422                                 }
1423
1424                                 # The characters '<' and '>' (which were escaped by
1425                                 # removeHTMLtags()) should not be included in
1426                                 # URLs, per RFC 2396.
1427                                 $m2 = array();
1428                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1429                                         $trail = substr($url, $m2[0][1]) . $trail;
1430                                         $url = substr($url, 0, $m2[0][1]);
1431                                 }
1432
1433                                 # Move trailing punctuation to $trail
1434                                 $sep = ',;\.:!?';
1435                                 # If there is no left bracket, then consider right brackets fair game too
1436                                 if ( strpos( $url, '(' ) === false ) {
1437                                         $sep .= ')';
1438                                 }
1439
1440                                 $numSepChars = strspn( strrev( $url ), $sep );
1441                                 if ( $numSepChars ) {
1442                                         $trail = substr( $url, -$numSepChars ) . $trail;
1443                                         $url = substr( $url, 0, -$numSepChars );
1444                                 }
1445
1446                                 $url = Sanitizer::cleanUrl( $url );
1447
1448                                 # Is this an external image?
1449                                 $text = $this->maybeMakeExternalImage( $url );
1450                                 if ( $text === false ) {
1451                                         # Not an image, make a link
1452                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1453                                         # Register it in the output object...
1454                                         # Replace unnecessary URL escape codes with their equivalent characters
1455                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1456                                         $this->mOutput->addExternalLink( $pasteurized );
1457                                 }
1458                                 $s .= $text . $trail;
1459                         } else {
1460                                 $s .= $protocol . $remainder;
1461                         }
1462                 }
1463                 wfProfileOut( $fname );
1464                 return $s;
1465         }
1466
1467         /**
1468          * Replace unusual URL escape codes with their equivalent characters
1469          * @param string
1470          * @return string
1471          * @static
1472          * @todo  This can merge genuinely required bits in the path or query string,
1473          *        breaking legit URLs. A proper fix would treat the various parts of
1474          *        the URL differently; as a workaround, just use the output for
1475          *        statistical records, not for actual linking/output.
1476          */
1477         static function replaceUnusualEscapes( $url ) {
1478                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1479                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1480         }
1481
1482         /**
1483          * Callback function used in replaceUnusualEscapes().
1484          * Replaces unusual URL escape codes with their equivalent character
1485          * @static
1486          * @private
1487          */
1488         private static function replaceUnusualEscapesCallback( $matches ) {
1489                 $char = urldecode( $matches[0] );
1490                 $ord = ord( $char );
1491                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1492                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1493                         // No, shouldn't be escaped
1494                         return $char;
1495                 } else {
1496                         // Yes, leave it escaped
1497                         return $matches[0];
1498                 }
1499         }
1500
1501         /**
1502          * make an image if it's allowed, either through the global
1503          * option or through the exception
1504          * @private
1505          */
1506         function maybeMakeExternalImage( $url ) {
1507                 $sk = $this->mOptions->getSkin();
1508                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1509                 $imagesexception = !empty($imagesfrom);
1510                 $text = false;
1511                 if ( $this->mOptions->getAllowExternalImages()
1512                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1513                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1514                                 # Image found
1515                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1516                         }
1517                 }
1518                 return $text;
1519         }
1520
1521         /**
1522          * Process [[ ]] wikilinks
1523          *
1524          * @private
1525          */
1526         function replaceInternalLinks( $s ) {
1527                 global $wgContLang;
1528                 static $fname = 'Parser::replaceInternalLinks' ;
1529
1530                 wfProfileIn( $fname );
1531
1532                 wfProfileIn( $fname.'-setup' );
1533                 static $tc = FALSE;
1534                 # the % is needed to support urlencoded titles as well
1535                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1536
1537                 $sk = $this->mOptions->getSkin();
1538
1539                 #split the entire text string on occurences of [[
1540                 $a = explode( '[[', ' ' . $s );
1541                 #get the first element (all text up to first [[), and remove the space we added
1542                 $s = array_shift( $a );
1543                 $s = substr( $s, 1 );
1544
1545                 # Match a link having the form [[namespace:link|alternate]]trail
1546                 static $e1 = FALSE;
1547                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1548                 # Match cases where there is no "]]", which might still be images
1549                 static $e1_img = FALSE;
1550                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1551                 # Match the end of a line for a word that's not followed by whitespace,
1552                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1553                 $e2 = wfMsgForContent( 'linkprefix' );
1554
1555                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1556                 if( is_null( $this->mTitle ) ) {
1557                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1558                 }
1559                 $nottalk = !$this->mTitle->isTalkPage();
1560
1561                 if ( $useLinkPrefixExtension ) {
1562                         $m = array();
1563                         if ( preg_match( $e2, $s, $m ) ) {
1564                                 $first_prefix = $m[2];
1565                         } else {
1566                                 $first_prefix = false;
1567                         }
1568                 } else {
1569                         $prefix = '';
1570                 }
1571
1572                 if($wgContLang->hasVariants()) {
1573                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1574                 } else {
1575                         $selflink = array($this->mTitle->getPrefixedText());
1576                 }
1577                 $useSubpages = $this->areSubpagesAllowed();
1578                 wfProfileOut( $fname.'-setup' );
1579
1580                 # Loop for each link
1581                 for ($k = 0; isset( $a[$k] ); $k++) {
1582                         $line = $a[$k];
1583                         if ( $useLinkPrefixExtension ) {
1584                                 wfProfileIn( $fname.'-prefixhandling' );
1585                                 if ( preg_match( $e2, $s, $m ) ) {
1586                                         $prefix = $m[2];
1587                                         $s = $m[1];
1588                                 } else {
1589                                         $prefix='';
1590                                 }
1591                                 # first link
1592                                 if($first_prefix) {
1593                                         $prefix = $first_prefix;
1594                                         $first_prefix = false;
1595                                 }
1596                                 wfProfileOut( $fname.'-prefixhandling' );
1597                         }
1598
1599                         $might_be_img = false;
1600
1601                         wfProfileIn( "$fname-e1" );
1602                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1603                                 $text = $m[2];
1604                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1605                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1606                                 # the real problem is with the $e1 regex
1607                                 # See bug 1300.
1608                                 #
1609                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1610                                 # and no image is in sight. See bug 2095.
1611                                 #
1612                                 if( $text !== '' &&
1613                                         substr( $m[3], 0, 1 ) === ']' &&
1614                                         strpos($text, '[') !== false
1615                                 )
1616                                 {
1617                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1618                                         $m[3] = substr( $m[3], 1 );
1619                                 }
1620                                 # fix up urlencoded title texts
1621                                 if( strpos( $m[1], '%' ) !== false ) {
1622                                         # Should anchors '#' also be rejected?
1623                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1624                                 }
1625                                 $trail = $m[3];
1626                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1627                                 $might_be_img = true;
1628                                 $text = $m[2];
1629                                 if ( strpos( $m[1], '%' ) !== false ) {
1630                                         $m[1] = urldecode($m[1]);
1631                                 }
1632                                 $trail = "";
1633                         } else { # Invalid form; output directly
1634                                 $s .= $prefix . '[[' . $line ;
1635                                 wfProfileOut( "$fname-e1" );
1636                                 continue;
1637                         }
1638                         wfProfileOut( "$fname-e1" );
1639                         wfProfileIn( "$fname-misc" );
1640
1641                         # Don't allow internal links to pages containing
1642                         # PROTO: where PROTO is a valid URL protocol; these
1643                         # should be external links.
1644                         if (preg_match('/^(\b(?:' . wfUrlProtocols() . '))/', $m[1])) {
1645                                 $s .= $prefix . '[[' . $line ;
1646                                 continue;
1647                         }
1648
1649                         # Make subpage if necessary
1650                         if( $useSubpages ) {
1651                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1652                         } else {
1653                                 $link = $m[1];
1654                         }
1655
1656                         $noforce = (substr($m[1], 0, 1) != ':');
1657                         if (!$noforce) {
1658                                 # Strip off leading ':'
1659                                 $link = substr($link, 1);
1660                         }
1661
1662                         wfProfileOut( "$fname-misc" );
1663                         wfProfileIn( "$fname-title" );
1664                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1665                         if( !$nt ) {
1666                                 $s .= $prefix . '[[' . $line;
1667                                 wfProfileOut( "$fname-title" );
1668                                 continue;
1669                         }
1670
1671                         $ns = $nt->getNamespace();
1672                         $iw = $nt->getInterWiki();
1673                         wfProfileOut( "$fname-title" );
1674
1675                         if ($might_be_img) { # if this is actually an invalid link
1676                                 wfProfileIn( "$fname-might_be_img" );
1677                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1678                                         $found = false;
1679                                         while (isset ($a[$k+1]) ) {
1680                                                 #look at the next 'line' to see if we can close it there
1681                                                 $spliced = array_splice( $a, $k + 1, 1 );
1682                                                 $next_line = array_shift( $spliced );
1683                                                 $m = explode( ']]', $next_line, 3 );
1684                                                 if ( count( $m ) == 3 ) {
1685                                                         # the first ]] closes the inner link, the second the image
1686                                                         $found = true;
1687                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1688                                                         $trail = $m[2];
1689                                                         break;
1690                                                 } elseif ( count( $m ) == 2 ) {
1691                                                         #if there's exactly one ]] that's fine, we'll keep looking
1692                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1693                                                 } else {
1694                                                         #if $next_line is invalid too, we need look no further
1695                                                         $text .= '[[' . $next_line;
1696                                                         break;
1697                                                 }
1698                                         }
1699                                         if ( !$found ) {
1700                                                 # we couldn't find the end of this imageLink, so output it raw
1701                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1702                                                 $text = $this->replaceInternalLinks($text);
1703                                                 $s .= "{$prefix}[[$link|$text";
1704                                                 # note: no $trail, because without an end, there *is* no trail
1705                                                 wfProfileOut( "$fname-might_be_img" );
1706                                                 continue;
1707                                         }
1708                                 } else { #it's not an image, so output it raw
1709                                         $s .= "{$prefix}[[$link|$text";
1710                                         # note: no $trail, because without an end, there *is* no trail
1711                                         wfProfileOut( "$fname-might_be_img" );
1712                                         continue;
1713                                 }
1714                                 wfProfileOut( "$fname-might_be_img" );
1715                         }
1716
1717                         $wasblank = ( '' == $text );
1718                         if( $wasblank ) $text = $link;
1719
1720                         # Link not escaped by : , create the various objects
1721                         if( $noforce ) {
1722
1723                                 # Interwikis
1724                                 wfProfileIn( "$fname-interwiki" );
1725                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1726                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1727                                         $s = rtrim($s . $prefix);
1728                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1729                                         wfProfileOut( "$fname-interwiki" );
1730                                         continue;
1731                                 }
1732                                 wfProfileOut( "$fname-interwiki" );
1733
1734                                 if ( $ns == NS_IMAGE ) {
1735                                         wfProfileIn( "$fname-image" );
1736                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1737                                                 # recursively parse links inside the image caption
1738                                                 # actually, this will parse them in any other parameters, too,
1739                                                 # but it might be hard to fix that, and it doesn't matter ATM
1740                                                 $text = $this->replaceExternalLinks($text);
1741                                                 $text = $this->replaceInternalLinks($text);
1742
1743                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1744                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1745                                                 $this->mOutput->addImage( $nt->getDBkey() );
1746
1747                                                 wfProfileOut( "$fname-image" );
1748                                                 continue;
1749                                         } else {
1750                                                 # We still need to record the image's presence on the page
1751                                                 $this->mOutput->addImage( $nt->getDBkey() );
1752                                         }
1753                                         wfProfileOut( "$fname-image" );
1754
1755                                 }
1756
1757                                 if ( $ns == NS_CATEGORY ) {
1758                                         wfProfileIn( "$fname-category" );
1759                                         $s = rtrim($s . "\n"); # bug 87
1760
1761                                         if ( $wasblank ) {
1762                                                 $sortkey = $this->getDefaultSort();
1763                                         } else {
1764                                                 $sortkey = $text;
1765                                         }
1766                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1767                                         $sortkey = str_replace( "\n", '', $sortkey );
1768                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1769                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1770
1771                                         /**
1772                                          * Strip the whitespace Category links produce, see bug 87
1773                                          * @todo We might want to use trim($tmp, "\n") here.
1774                                          */
1775                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1776
1777                                         wfProfileOut( "$fname-category" );
1778                                         continue;
1779                                 }
1780                         }
1781
1782                         # Self-link checking
1783                         if( $nt->getFragment() === '' ) {
1784                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1785                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1786                                         continue;
1787                                 }
1788                         }
1789
1790                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1791                         if( $ns == NS_MEDIA ) {
1792                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1793                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1794                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1795                                 $this->mOutput->addImage( $nt->getDBkey() );
1796                                 continue;
1797                         } elseif( $ns == NS_SPECIAL ) {
1798                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1799                                 continue;
1800                         } elseif( $ns == NS_IMAGE ) {
1801                                 $img = new Image( $nt );
1802                                 if( $img->exists() ) {
1803                                         // Force a blue link if the file exists; may be a remote
1804                                         // upload on the shared repository, and we want to see its
1805                                         // auto-generated page.
1806                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1807                                         $this->mOutput->addLink( $nt );
1808                                         continue;
1809                                 }
1810                         }
1811                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1812                 }
1813                 wfProfileOut( $fname );
1814                 return $s;
1815         }
1816
1817         /**
1818          * Make a link placeholder. The text returned can be later resolved to a real link with
1819          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1820          * parsing of interwiki links, and secondly to allow all existence checks and
1821          * article length checks (for stub links) to be bundled into a single query.
1822          *
1823          */
1824         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1825                 wfProfileIn( __METHOD__ );
1826                 if ( ! is_object($nt) ) {
1827                         # Fail gracefully
1828                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1829                 } else {
1830                         # Separate the link trail from the rest of the link
1831                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1832
1833                         if ( $nt->isExternal() ) {
1834                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1835                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1836                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1837                         } else {
1838                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1839                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1840                                 $this->mLinkHolders['queries'][] = $query;
1841                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1842                                 $this->mLinkHolders['titles'][] = $nt;
1843
1844                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1845                         }
1846                 }
1847                 wfProfileOut( __METHOD__ );
1848                 return $retVal;
1849         }
1850
1851         /**
1852          * Render a forced-blue link inline; protect against double expansion of
1853          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1854          * Since this little disaster has to split off the trail text to avoid
1855          * breaking URLs in the following text without breaking trails on the
1856          * wiki links, it's been made into a horrible function.
1857          *
1858          * @param Title $nt
1859          * @param string $text
1860          * @param string $query
1861          * @param string $trail
1862          * @param string $prefix
1863          * @return string HTML-wikitext mix oh yuck
1864          */
1865         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1866                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1867                 $sk = $this->mOptions->getSkin();
1868                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1869                 return $this->armorLinks( $link ) . $trail;
1870         }
1871
1872         /**
1873          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1874          * going to go through further parsing steps before inline URL expansion.
1875          *
1876          * In particular this is important when using action=render, which causes
1877          * full URLs to be included.
1878          *
1879          * Oh man I hate our multi-layer parser!
1880          *
1881          * @param string more-or-less HTML
1882          * @return string less-or-more HTML with NOPARSE bits
1883          */
1884         function armorLinks( $text ) {
1885                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1886                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1887         }
1888
1889         /**
1890          * Return true if subpage links should be expanded on this page.
1891          * @return bool
1892          */
1893         function areSubpagesAllowed() {
1894                 # Some namespaces don't allow subpages
1895                 global $wgNamespacesWithSubpages;
1896                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1897         }
1898
1899         /**
1900          * Handle link to subpage if necessary
1901          * @param string $target the source of the link
1902          * @param string &$text the link text, modified as necessary
1903          * @return string the full name of the link
1904          * @private
1905          */
1906         function maybeDoSubpageLink($target, &$text) {
1907                 # Valid link forms:
1908                 # Foobar -- normal
1909                 # :Foobar -- override special treatment of prefix (images, language links)
1910                 # /Foobar -- convert to CurrentPage/Foobar
1911                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1912                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1913                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1914
1915                 $fname = 'Parser::maybeDoSubpageLink';
1916                 wfProfileIn( $fname );
1917                 $ret = $target; # default return value is no change
1918
1919                 # bug 7425
1920                 $target = trim( $target );
1921
1922                 # Some namespaces don't allow subpages,
1923                 # so only perform processing if subpages are allowed
1924                 if( $this->areSubpagesAllowed() ) {
1925                         # Look at the first character
1926                         if( $target != '' && $target{0} == '/' ) {
1927                                 # / at end means we don't want the slash to be shown
1928                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1929                                 if( $trailingSlashes ) {
1930                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1931                                 } else {
1932                                         $noslash = substr( $target, 1 );
1933                                 }
1934
1935                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1936                                 if( '' === $text ) {
1937                                         $text = $target;
1938                                 } # this might be changed for ugliness reasons
1939                         } else {
1940                                 # check for .. subpage backlinks
1941                                 $dotdotcount = 0;
1942                                 $nodotdot = $target;
1943                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1944                                         ++$dotdotcount;
1945                                         $nodotdot = substr( $nodotdot, 3 );
1946                                 }
1947                                 if($dotdotcount > 0) {
1948                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1949                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1950                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1951                                                 # / at the end means don't show full path
1952                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1953                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1954                                                         if( '' === $text ) {
1955                                                                 $text = $nodotdot;
1956                                                         }
1957                                                 }
1958                                                 $nodotdot = trim( $nodotdot );
1959                                                 if( $nodotdot != '' ) {
1960                                                         $ret .= '/' . $nodotdot;
1961                                                 }
1962                                         }
1963                                 }
1964                         }
1965                 }
1966
1967                 wfProfileOut( $fname );
1968                 return $ret;
1969         }
1970
1971         /**#@+
1972          * Used by doBlockLevels()
1973          * @private
1974          */
1975         /* private */ function closeParagraph() {
1976                 $result = '';
1977                 if ( '' != $this->mLastSection ) {
1978                         $result = '</' . $this->mLastSection  . ">\n";
1979                 }
1980                 $this->mInPre = false;
1981                 $this->mLastSection = '';
1982                 return $result;
1983         }
1984         # getCommon() returns the length of the longest common substring
1985         # of both arguments, starting at the beginning of both.
1986         #
1987         /* private */ function getCommon( $st1, $st2 ) {
1988                 $fl = strlen( $st1 );
1989                 $shorter = strlen( $st2 );
1990                 if ( $fl < $shorter ) { $shorter = $fl; }
1991
1992                 for ( $i = 0; $i < $shorter; ++$i ) {
1993                         if ( $st1{$i} != $st2{$i} ) { break; }
1994                 }
1995                 return $i;
1996         }
1997         # These next three functions open, continue, and close the list
1998         # element appropriate to the prefix character passed into them.
1999         #
2000         /* private */ function openList( $char ) {
2001                 $result = $this->closeParagraph();
2002
2003                 if ( '*' == $char ) { $result .= '<ul><li>'; }
2004                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
2005                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
2006                 else if ( ';' == $char ) {
2007                         $result .= '<dl><dt>';
2008                         $this->mDTopen = true;
2009                 }
2010                 else { $result = '<!-- ERR 1 -->'; }
2011
2012                 return $result;
2013         }
2014
2015         /* private */ function nextItem( $char ) {
2016                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2017                 else if ( ':' == $char || ';' == $char ) {
2018                         $close = '</dd>';
2019                         if ( $this->mDTopen ) { $close = '</dt>'; }
2020                         if ( ';' == $char ) {
2021                                 $this->mDTopen = true;
2022                                 return $close . '<dt>';
2023                         } else {
2024                                 $this->mDTopen = false;
2025                                 return $close . '<dd>';
2026                         }
2027                 }
2028                 return '<!-- ERR 2 -->';
2029         }
2030
2031         /* private */ function closeList( $char ) {
2032                 if ( '*' == $char ) { $text = '</li></ul>'; }
2033                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2034                 else if ( ':' == $char ) {
2035                         if ( $this->mDTopen ) {
2036                                 $this->mDTopen = false;
2037                                 $text = '</dt></dl>';
2038                         } else {
2039                                 $text = '</dd></dl>';
2040                         }
2041                 }
2042                 else {  return '<!-- ERR 3 -->'; }
2043                 return $text."\n";
2044         }
2045         /**#@-*/
2046
2047         /**
2048          * Make lists from lines starting with ':', '*', '#', etc.
2049          *
2050          * @private
2051          * @return string the lists rendered as HTML
2052          */
2053         function doBlockLevels( $text, $linestart ) {
2054                 $fname = 'Parser::doBlockLevels';
2055                 wfProfileIn( $fname );
2056
2057                 # Parsing through the text line by line.  The main thing
2058                 # happening here is handling of block-level elements p, pre,
2059                 # and making lists from lines starting with * # : etc.
2060                 #
2061                 $textLines = explode( "\n", $text );
2062
2063                 $lastPrefix = $output = '';
2064                 $this->mDTopen = $inBlockElem = false;
2065                 $prefixLength = 0;
2066                 $paragraphStack = false;
2067
2068                 if ( !$linestart ) {
2069                         $output .= array_shift( $textLines );
2070                 }
2071                 foreach ( $textLines as $oLine ) {
2072                         $lastPrefixLength = strlen( $lastPrefix );
2073                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2074                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2075                         if ( !$this->mInPre ) {
2076                                 # Multiple prefixes may abut each other for nested lists.
2077                                 $prefixLength = strspn( $oLine, '*#:;' );
2078                                 $pref = substr( $oLine, 0, $prefixLength );
2079
2080                                 # eh?
2081                                 $pref2 = str_replace( ';', ':', $pref );
2082                                 $t = substr( $oLine, $prefixLength );
2083                                 $this->mInPre = !empty($preOpenMatch);
2084                         } else {
2085                                 # Don't interpret any other prefixes in preformatted text
2086                                 $prefixLength = 0;
2087                                 $pref = $pref2 = '';
2088                                 $t = $oLine;
2089                         }
2090
2091                         # List generation
2092                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2093                                 # Same as the last item, so no need to deal with nesting or opening stuff
2094                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2095                                 $paragraphStack = false;
2096
2097                                 if ( substr( $pref, -1 ) == ';') {
2098                                         # The one nasty exception: definition lists work like this:
2099                                         # ; title : definition text
2100                                         # So we check for : in the remainder text to split up the
2101                                         # title and definition, without b0rking links.
2102                                         $term = $t2 = '';
2103                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2104                                                 $t = $t2;
2105                                                 $output .= $term . $this->nextItem( ':' );
2106                                         }
2107                                 }
2108                         } elseif( $prefixLength || $lastPrefixLength ) {
2109                                 # Either open or close a level...
2110                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2111                                 $paragraphStack = false;
2112
2113                                 while( $commonPrefixLength < $lastPrefixLength ) {
2114                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2115                                         --$lastPrefixLength;
2116                                 }
2117                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2118                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2119                                 }
2120                                 while ( $prefixLength > $commonPrefixLength ) {
2121                                         $char = substr( $pref, $commonPrefixLength, 1 );
2122                                         $output .= $this->openList( $char );
2123
2124                                         if ( ';' == $char ) {
2125                                                 # FIXME: This is dupe of code above
2126                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2127                                                         $t = $t2;
2128                                                         $output .= $term . $this->nextItem( ':' );
2129                                                 }
2130                                         }
2131                                         ++$commonPrefixLength;
2132                                 }
2133                                 $lastPrefix = $pref2;
2134                         }
2135                         if( 0 == $prefixLength ) {
2136                                 wfProfileIn( "$fname-paragraph" );
2137                                 # No prefix (not in list)--go to paragraph mode
2138                                 // XXX: use a stack for nestable elements like span, table and div
2139                                 $openmatch = preg_match('/(<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2140                                 $closematch = preg_match(
2141                                         '/(<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2142                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2143                                 if ( $openmatch or $closematch ) {
2144                                         $paragraphStack = false;
2145                                         # TODO bug 5718: paragraph closed
2146                                         $output .= $this->closeParagraph();
2147                                         if ( $preOpenMatch and !$preCloseMatch ) {
2148                                                 $this->mInPre = true;
2149                                         }
2150                                         if ( $closematch ) {
2151                                                 $inBlockElem = false;
2152                                         } else {
2153                                                 $inBlockElem = true;
2154                                         }
2155                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2156                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2157                                                 // pre
2158                                                 if ($this->mLastSection != 'pre') {
2159                                                         $paragraphStack = false;
2160                                                         $output .= $this->closeParagraph().'<pre>';
2161                                                         $this->mLastSection = 'pre';
2162                                                 }
2163                                                 $t = substr( $t, 1 );
2164                                         } else {
2165                                                 // paragraph
2166                                                 if ( '' == trim($t) ) {
2167                                                         if ( $paragraphStack ) {
2168                                                                 $output .= $paragraphStack.'<br />';
2169                                                                 $paragraphStack = false;
2170                                                                 $this->mLastSection = 'p';
2171                                                         } else {
2172                                                                 if ($this->mLastSection != 'p' ) {
2173                                                                         $output .= $this->closeParagraph();
2174                                                                         $this->mLastSection = '';
2175                                                                         $paragraphStack = '<p>';
2176                                                                 } else {
2177                                                                         $paragraphStack = '</p><p>';
2178                                                                 }
2179                                                         }
2180                                                 } else {
2181                                                         if ( $paragraphStack ) {
2182                                                                 $output .= $paragraphStack;
2183                                                                 $paragraphStack = false;
2184                                                                 $this->mLastSection = 'p';
2185                                                         } else if ($this->mLastSection != 'p') {
2186                                                                 $output .= $this->closeParagraph().'<p>';
2187                                                                 $this->mLastSection = 'p';
2188                                                         }
2189                                                 }
2190                                         }
2191                                 }
2192                                 wfProfileOut( "$fname-paragraph" );
2193                         }
2194                         // somewhere above we forget to get out of pre block (bug 785)
2195                         if($preCloseMatch && $this->mInPre) {
2196                                 $this->mInPre = false;
2197                         }
2198                         if ($paragraphStack === false) {
2199                                 $output .= $t."\n";
2200                         }
2201                 }
2202                 while ( $prefixLength ) {
2203                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2204                         --$prefixLength;
2205                 }
2206                 if ( '' != $this->mLastSection ) {
2207                         $output .= '</' . $this->mLastSection . '>';
2208                         $this->mLastSection = '';
2209                 }
2210
2211                 wfProfileOut( $fname );
2212                 return $output;
2213         }
2214
2215         /**
2216          * Split up a string on ':', ignoring any occurences inside tags
2217          * to prevent illegal overlapping.
2218          * @param string $str the string to split
2219          * @param string &$before set to everything before the ':'
2220          * @param string &$after set to everything after the ':'
2221          * return string the position of the ':', or false if none found
2222          */
2223         function findColonNoLinks($str, &$before, &$after) {
2224                 $fname = 'Parser::findColonNoLinks';
2225                 wfProfileIn( $fname );
2226
2227                 $pos = strpos( $str, ':' );
2228                 if( $pos === false ) {
2229                         // Nothing to find!
2230                         wfProfileOut( $fname );
2231                         return false;
2232                 }
2233
2234                 $lt = strpos( $str, '<' );
2235                 if( $lt === false || $lt > $pos ) {
2236                         // Easy; no tag nesting to worry about
2237                         $before = substr( $str, 0, $pos );
2238                         $after = substr( $str, $pos+1 );
2239                         wfProfileOut( $fname );
2240                         return $pos;
2241                 }
2242
2243                 // Ugly state machine to walk through avoiding tags.
2244                 $state = MW_COLON_STATE_TEXT;
2245                 $stack = 0;
2246                 $len = strlen( $str );
2247                 for( $i = 0; $i < $len; $i++ ) {
2248                         $c = $str{$i};
2249
2250                         switch( $state ) {
2251                         // (Using the number is a performance hack for common cases)
2252                         case 0: // MW_COLON_STATE_TEXT:
2253                                 switch( $c ) {
2254                                 case "<":
2255                                         // Could be either a <start> tag or an </end> tag
2256                                         $state = MW_COLON_STATE_TAGSTART;
2257                                         break;
2258                                 case ":":
2259                                         if( $stack == 0 ) {
2260                                                 // We found it!
2261                                                 $before = substr( $str, 0, $i );
2262                                                 $after = substr( $str, $i + 1 );
2263                                                 wfProfileOut( $fname );
2264                                                 return $i;
2265                                         }
2266                                         // Embedded in a tag; don't break it.
2267                                         break;
2268                                 default:
2269                                         // Skip ahead looking for something interesting
2270                                         $colon = strpos( $str, ':', $i );
2271                                         if( $colon === false ) {
2272                                                 // Nothing else interesting
2273                                                 wfProfileOut( $fname );
2274                                                 return false;
2275                                         }
2276                                         $lt = strpos( $str, '<', $i );
2277                                         if( $stack === 0 ) {
2278                                                 if( $lt === false || $colon < $lt ) {
2279                                                         // We found it!
2280                                                         $before = substr( $str, 0, $colon );
2281                                                         $after = substr( $str, $colon + 1 );
2282                                                         wfProfileOut( $fname );
2283                                                         return $i;
2284                                                 }
2285                                         }
2286                                         if( $lt === false ) {
2287                                                 // Nothing else interesting to find; abort!
2288                                                 // We're nested, but there's no close tags left. Abort!
2289                                                 break 2;
2290                                         }
2291                                         // Skip ahead to next tag start
2292                                         $i = $lt;
2293                                         $state = MW_COLON_STATE_TAGSTART;
2294                                 }
2295                                 break;
2296                         case 1: // MW_COLON_STATE_TAG:
2297                                 // In a <tag>
2298                                 switch( $c ) {
2299                                 case ">":
2300                                         $stack++;
2301                                         $state = MW_COLON_STATE_TEXT;
2302                                         break;
2303                                 case "/":
2304                                         // Slash may be followed by >?
2305                                         $state = MW_COLON_STATE_TAGSLASH;
2306                                         break;
2307                                 default:
2308                                         // ignore
2309                                 }
2310                                 break;
2311                         case 2: // MW_COLON_STATE_TAGSTART:
2312                                 switch( $c ) {
2313                                 case "/":
2314                                         $state = MW_COLON_STATE_CLOSETAG;
2315                                         break;
2316                                 case "!":
2317                                         $state = MW_COLON_STATE_COMMENT;
2318                                         break;
2319                                 case ">":
2320                                         // Illegal early close? This shouldn't happen D:
2321                                         $state = MW_COLON_STATE_TEXT;
2322                                         break;
2323                                 default:
2324                                         $state = MW_COLON_STATE_TAG;
2325                                 }
2326                                 break;
2327                         case 3: // MW_COLON_STATE_CLOSETAG:
2328                                 // In a </tag>
2329                                 if( $c == ">" ) {
2330                                         $stack--;
2331                                         if( $stack < 0 ) {
2332                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2333                                                 wfProfileOut( $fname );
2334                                                 return false;
2335                                         }
2336                                         $state = MW_COLON_STATE_TEXT;
2337                                 }
2338                                 break;
2339                         case MW_COLON_STATE_TAGSLASH:
2340                                 if( $c == ">" ) {
2341                                         // Yes, a self-closed tag <blah/>
2342                                         $state = MW_COLON_STATE_TEXT;
2343                                 } else {
2344                                         // Probably we're jumping the gun, and this is an attribute
2345                                         $state = MW_COLON_STATE_TAG;
2346                                 }
2347                                 break;
2348                         case 5: // MW_COLON_STATE_COMMENT:
2349                                 if( $c == "-" ) {
2350                                         $state = MW_COLON_STATE_COMMENTDASH;
2351                                 }
2352                                 break;
2353                         case MW_COLON_STATE_COMMENTDASH:
2354                                 if( $c == "-" ) {
2355                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2356                                 } else {
2357                                         $state = MW_COLON_STATE_COMMENT;
2358                                 }
2359                                 break;
2360                         case MW_COLON_STATE_COMMENTDASHDASH:
2361                                 if( $c == ">" ) {
2362                                         $state = MW_COLON_STATE_TEXT;
2363                                 } else {
2364                                         $state = MW_COLON_STATE_COMMENT;
2365                                 }
2366                                 break;
2367                         default:
2368                                 throw new MWException( "State machine error in $fname" );
2369                         }
2370                 }
2371                 if( $stack > 0 ) {
2372                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2373                         return false;
2374                 }
2375                 wfProfileOut( $fname );
2376                 return false;
2377         }
2378
2379         /**
2380          * Return value of a magic variable (like PAGENAME)
2381          *
2382          * @private
2383          */
2384         function getVariableValue( $index ) {
2385                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2386
2387                 /**
2388                  * Some of these require message or data lookups and can be
2389                  * expensive to check many times.
2390                  */
2391                 static $varCache = array();
2392                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2393                         if ( isset( $varCache[$index] ) ) {
2394                                 return $varCache[$index];
2395                         }
2396                 }
2397
2398                 $ts = time();
2399                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2400
2401                 # Use the time zone
2402                 global $wgLocaltimezone;
2403                 if ( isset( $wgLocaltimezone ) ) {
2404                         $oldtz = getenv( 'TZ' );
2405                         putenv( 'TZ='.$wgLocaltimezone );
2406                 }
2407                 $localTimestamp = date( 'YmdHis', $ts );
2408                 $localMonth = date( 'm', $ts );
2409                 $localMonthName = date( 'n', $ts );
2410                 $localDay = date( 'j', $ts );
2411                 $localDay2 = date( 'd', $ts );
2412                 $localDayOfWeek = date( 'w', $ts );
2413                 $localWeek = date( 'W', $ts );
2414                 $localYear = date( 'Y', $ts );
2415                 $localHour = date( 'H', $ts );
2416                 if ( isset( $wgLocaltimezone ) ) {
2417                         putenv( 'TZ='.$oldtz );
2418                 }
2419
2420                 switch ( $index ) {
2421                         case 'currentmonth':
2422                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2423                         case 'currentmonthname':
2424                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2425                         case 'currentmonthnamegen':
2426                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2427                         case 'currentmonthabbrev':
2428                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2429                         case 'currentday':
2430                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2431                         case 'currentday2':
2432                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2433                         case 'localmonth':
2434                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2435                         case 'localmonthname':
2436                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2437                         case 'localmonthnamegen':
2438                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2439                         case 'localmonthabbrev':
2440                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2441                         case 'localday':
2442                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2443                         case 'localday2':
2444                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2445                         case 'pagename':
2446                                 return $this->mTitle->getText();
2447                         case 'pagenamee':
2448                                 return $this->mTitle->getPartialURL();
2449                         case 'fullpagename':
2450                                 return $this->mTitle->getPrefixedText();
2451                         case 'fullpagenamee':
2452                                 return $this->mTitle->getPrefixedURL();
2453                         case 'subpagename':
2454                                 return $this->mTitle->getSubpageText();
2455                         case 'subpagenamee':
2456                                 return $this->mTitle->getSubpageUrlForm();
2457                         case 'basepagename':
2458                                 return $this->mTitle->getBaseText();
2459                         case 'basepagenamee':
2460                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2461                         case 'talkpagename':
2462                                 if( $this->mTitle->canTalk() ) {
2463                                         $talkPage = $this->mTitle->getTalkPage();
2464                                         return $talkPage->getPrefixedText();
2465                                 } else {
2466                                         return '';
2467                                 }
2468                         case 'talkpagenamee':
2469                                 if( $this->mTitle->canTalk() ) {
2470                                         $talkPage = $this->mTitle->getTalkPage();
2471                                         return $talkPage->getPrefixedUrl();
2472                                 } else {
2473                                         return '';
2474                                 }
2475                         case 'subjectpagename':
2476                                 $subjPage = $this->mTitle->getSubjectPage();
2477                                 return $subjPage->getPrefixedText();
2478                         case 'subjectpagenamee':
2479                                 $subjPage = $this->mTitle->getSubjectPage();
2480                                 return $subjPage->getPrefixedUrl();
2481                         case 'revisionid':
2482                                 return $this->mRevisionId;
2483                         case 'revisionday':
2484                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2485                         case 'revisionday2':
2486                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2487                         case 'revisionmonth':
2488                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2489                         case 'revisionyear':
2490                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2491                         case 'revisiontimestamp':
2492                                 return $this->getRevisionTimestamp();
2493                         case 'namespace':
2494                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2495                         case 'namespacee':
2496                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2497                         case 'talkspace':
2498                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2499                         case 'talkspacee':
2500                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2501                         case 'subjectspace':
2502                                 return $this->mTitle->getSubjectNsText();
2503                         case 'subjectspacee':
2504                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2505                         case 'currentdayname':
2506                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2507                         case 'currentyear':
2508                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2509                         case 'currenttime':
2510                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2511                         case 'currenthour':
2512                                 return $varCache[$index] = $wgContLang->formatNum( date( 'H', $ts ), true );
2513                         case 'currentweek':
2514                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2515                                 // int to remove the padding
2516                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2517                         case 'currentdow':
2518                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2519                         case 'localdayname':
2520                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2521                         case 'localyear':
2522                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2523                         case 'localtime':
2524                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2525                         case 'localhour':
2526                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2527                         case 'localweek':
2528                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2529                                 // int to remove the padding
2530                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2531                         case 'localdow':
2532                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2533                         case 'numberofarticles':
2534                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2535                         case 'numberoffiles':
2536                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2537                         case 'numberofusers':
2538                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2539                         case 'numberofpages':
2540                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2541                         case 'numberofadmins':
2542                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2543                         case 'currenttimestamp':
2544                                 return $varCache[$index] = wfTimestampNow();
2545                         case 'localtimestamp':
2546                                 return $varCache[$index] = $localTimestamp;
2547                         case 'currentversion':
2548                                 return $varCache[$index] = SpecialVersion::getVersion();
2549                         case 'sitename':
2550                                 return $wgSitename;
2551                         case 'server':
2552                                 return $wgServer;
2553                         case 'servername':
2554                                 return $wgServerName;
2555                         case 'scriptpath':
2556                                 return $wgScriptPath;
2557                         case 'directionmark':
2558                                 return $wgContLang->getDirMark();
2559                         case 'contentlanguage':
2560                                 global $wgContLanguageCode;
2561                                 return $wgContLanguageCode;
2562                         default:
2563                                 $ret = null;
2564                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2565                                         return $ret;
2566                                 else
2567                                         return null;
2568                 }
2569         }
2570
2571         /**
2572          * initialise the magic variables (like CURRENTMONTHNAME)
2573          *
2574          * @private
2575          */
2576         function initialiseVariables() {
2577                 $fname = 'Parser::initialiseVariables';
2578                 wfProfileIn( $fname );
2579                 $variableIDs = MagicWord::getVariableIDs();
2580
2581                 $this->mVariables = array();
2582                 foreach ( $variableIDs as $id ) {
2583                         $mw =& MagicWord::get( $id );
2584                         $mw->addToArray( $this->mVariables, $id );
2585                 }
2586                 wfProfileOut( $fname );
2587         }
2588
2589         /**
2590          * parse any parentheses in format ((title|part|part))
2591          * and call callbacks to get a replacement text for any found piece
2592          *
2593          * @param string $text The text to parse
2594          * @param array $callbacks rules in form:
2595          *     '{' => array(                            # opening parentheses
2596          *                                      'end' => '}',   # closing parentheses
2597          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2598          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2599          *                                                                )
2600          *                                      )
2601          *                                      'min' => 2,     # Minimum parenthesis count in cb
2602          *                                      'max' => 3,     # Maximum parenthesis count in cb
2603          * @private
2604          */
2605         function replace_callback ($text, $callbacks) {
2606                 wfProfileIn( __METHOD__ );
2607                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2608                 $lastOpeningBrace = -1;                 # last not closed parentheses
2609
2610                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2611
2612                 $i = 0;
2613                 while ( $i < strlen( $text ) ) {
2614                         # Find next opening brace, closing brace or pipe
2615                         if ( $lastOpeningBrace == -1 ) {
2616                                 $currentClosing = '';
2617                                 $search = $validOpeningBraces;
2618                         } else {
2619                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2620                                 $search = $validOpeningBraces . '|' . $currentClosing;
2621                         }
2622                         $rule = null;
2623                         $i += strcspn( $text, $search, $i );
2624                         if ( $i < strlen( $text ) ) {
2625                                 if ( $text[$i] == '|' ) {
2626                                         $found = 'pipe';
2627                                 } elseif ( $text[$i] == $currentClosing ) {
2628                                         $found = 'close';
2629                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2630                                         $found = 'open';
2631                                         $rule = $callbacks[$text[$i]];
2632                                 } else {
2633                                         # Some versions of PHP have a strcspn which stops on null characters
2634                                         # Ignore and continue
2635                                         ++$i;
2636                                         continue;
2637                                 }
2638                         } else {
2639                                 # All done
2640                                 break;
2641                         }
2642
2643                         if ( $found == 'open' ) {
2644                                 # found opening brace, let's add it to parentheses stack
2645                                 $piece = array('brace' => $text[$i],
2646                                                            'braceEnd' => $rule['end'],
2647                                                            'title' => '',
2648                                                            'parts' => null);
2649
2650                                 # count opening brace characters
2651                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2652                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2653                                 $i += $piece['count'];
2654
2655                                 # we need to add to stack only if opening brace count is enough for one of the rules
2656                                 if ( $piece['count'] >= $rule['min'] ) {
2657                                         $lastOpeningBrace ++;
2658                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2659                                 }
2660                         } elseif ( $found == 'close' ) {
2661                                 # lets check if it is enough characters for closing brace
2662                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2663                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2664
2665                                 # check for maximum matching characters (if there are 5 closing
2666                                 # characters, we will probably need only 3 - depending on the rules)
2667                                 $matchingCount = 0;
2668                                 $matchingCallback = null;
2669                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2670                                 if ( $count > $cbType['max'] ) {
2671                                         # The specified maximum exists in the callback array, unless the caller
2672                                         # has made an error
2673                                         $matchingCount = $cbType['max'];
2674                                 } else {
2675                                         # Count is less than the maximum
2676                                         # Skip any gaps in the callback array to find the true largest match
2677                                         # Need to use array_key_exists not isset because the callback can be null
2678                                         $matchingCount = $count;
2679                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2680                                                 --$matchingCount;
2681                                         }
2682                                 }
2683
2684                                 if ($matchingCount <= 0) {
2685                                         $i += $count;
2686                                         continue;
2687                                 }
2688                                 $matchingCallback = $cbType['cb'][$matchingCount];
2689
2690                                 # let's set a title or last part (if '|' was found)
2691                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2692                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2693                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2694                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2695                                 } else {
2696                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2697                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2698                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2699                                 }
2700
2701                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2702                                 $pieceEnd = $i + $matchingCount;
2703
2704                                 if( is_callable( $matchingCallback ) ) {
2705                                         $cbArgs = array (
2706                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2707                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2708                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2709                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2710                                                                          );
2711                                         # finally we can call a user callback and replace piece of text
2712                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2713                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2714                                         $i = $pieceStart + strlen($replaceWith);
2715                                 } else {
2716                                         # null value for callback means that parentheses should be parsed, but not replaced
2717                                         $i += $matchingCount;
2718                                 }
2719
2720                                 # reset last opening parentheses, but keep it in case there are unused characters
2721                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2722                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2723                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2724                                                            'title' => '',
2725                                                            'parts' => null,
2726                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2727                                 $openingBraceStack[$lastOpeningBrace--] = null;
2728
2729                                 if ($matchingCount < $piece['count']) {
2730                                         $piece['count'] -= $matchingCount;
2731                                         $piece['startAt'] -= $matchingCount;
2732                                         $piece['partStart'] = $piece['startAt'];
2733                                         # do we still qualify for any callback with remaining count?
2734                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2735                                         while ( $piece['count'] ) {
2736                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2737                                                         $lastOpeningBrace++;
2738                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2739                                                         break;
2740                                                 }
2741                                                 --$piece['count'];
2742                                         }
2743                                 }
2744                         } elseif ( $found == 'pipe' ) {
2745                                 # lets set a title if it is a first separator, or next part otherwise
2746                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2747                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2748                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2749                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2750                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2751                                 } else {
2752                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2753                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2754                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2755                                 }
2756                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2757                         }
2758                 }
2759
2760                 wfProfileOut( __METHOD__ );
2761                 return $text;
2762         }
2763
2764         /**
2765          * Replace magic variables, templates, and template arguments
2766          * with the appropriate text. Templates are substituted recursively,
2767          * taking care to avoid infinite loops.
2768          *
2769          * Note that the substitution depends on value of $mOutputType:
2770          *  OT_WIKI: only {{subst:}} templates
2771          *  OT_MSG: only magic variables
2772          *  OT_HTML: all templates and magic variables
2773          *
2774          * @param string $tex The text to transform
2775          * @param array $args Key-value pairs representing template parameters to substitute
2776          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2777          * @private
2778          */
2779         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2780                 # Prevent too big inclusions
2781                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2782                         return $text;
2783                 }
2784
2785                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2786                 wfProfileIn( $fname );
2787
2788                 # This function is called recursively. To keep track of arguments we need a stack:
2789                 array_push( $this->mArgStack, $args );
2790
2791                 $braceCallbacks = array();
2792                 if ( !$argsOnly ) {
2793                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2794                 }
2795                 if ( $this->mOutputType != OT_MSG ) {
2796                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2797                 }
2798                 if ( $braceCallbacks ) {
2799                         $callbacks = array(
2800                                 '{' => array(
2801                                         'end' => '}',
2802                                         'cb' => $braceCallbacks,
2803                                         'min' => $argsOnly ? 3 : 2,
2804                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2805                                 ),
2806                                 '[' => array(
2807                                         'end' => ']',
2808                                         'cb' => array(2=>null),
2809                                         'min' => 2,
2810                                         'max' => 2,
2811                                 )
2812                         );
2813                         $text = $this->replace_callback ($text, $callbacks);
2814
2815                         array_pop( $this->mArgStack );
2816                 }
2817                 wfProfileOut( $fname );
2818                 return $text;
2819         }
2820
2821         /**
2822          * Replace magic variables
2823          * @private
2824          */
2825         function variableSubstitution( $matches ) {
2826                 global $wgContLang;
2827                 $fname = 'Parser::variableSubstitution';
2828                 $varname = $wgContLang->lc($matches[1]);
2829                 wfProfileIn( $fname );
2830                 $skip = false;
2831                 if ( $this->mOutputType == OT_WIKI ) {
2832                         # Do only magic variables prefixed by SUBST
2833                         $mwSubst =& MagicWord::get( 'subst' );
2834                         if (!$mwSubst->matchStartAndRemove( $varname ))
2835                                 $skip = true;
2836                         # Note that if we don't substitute the variable below,
2837                         # we don't remove the {{subst:}} magic word, in case
2838                         # it is a template rather than a magic variable.
2839                 }
2840                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2841                         $id = $this->mVariables[$varname];
2842                         # Now check if we did really match, case sensitive or not
2843                         $mw =& MagicWord::get( $id );
2844                         if ($mw->match($matches[1])) {
2845                                 $text = $this->getVariableValue( $id );
2846                                 $this->mOutput->mContainsOldMagic = true;
2847                         } else {
2848                                 $text = $matches[0];
2849                         }
2850                 } else {
2851                         $text = $matches[0];
2852                 }
2853                 wfProfileOut( $fname );
2854                 return $text;
2855         }
2856
2857
2858         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2859         static function createAssocArgs( $args ) {
2860                 $assocArgs = array();
2861                 $index = 1;
2862                 foreach( $args as $arg ) {
2863                         $eqpos = strpos( $arg, '=' );
2864                         if ( $eqpos === false ) {
2865                                 $assocArgs[$index++] = $arg;
2866                         } else {
2867                                 $name = trim( substr( $arg, 0, $eqpos ) );
2868                                 $value = trim( substr( $arg, $eqpos+1 ) );
2869                                 if ( $value === false ) {
2870                                         $value = '';
2871                                 }
2872                                 if ( $name !== false ) {
2873                                         $assocArgs[$name] = $value;
2874                                 }
2875                         }
2876                 }
2877
2878                 return $assocArgs;
2879         }
2880
2881         /**
2882          * Return the text of a template, after recursively
2883          * replacing any variables or templates within the template.
2884          *
2885          * @param array $piece The parts of the template
2886          *  $piece['text']: matched text
2887          *  $piece['title']: the title, i.e. the part before the |
2888          *  $piece['parts']: the parameter array
2889          * @return string the text of the template
2890          * @private
2891          */
2892         function braceSubstitution( $piece ) {
2893                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2894                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2895                 wfProfileIn( $fname );
2896                 wfProfileIn( __METHOD__.'-setup' );
2897
2898                 # Flags
2899                 $found = false;             # $text has been filled
2900                 $nowiki = false;            # wiki markup in $text should be escaped
2901                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2902                 $noargs = false;            # Don't replace triple-brace arguments in $text
2903                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2904                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2905                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2906                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2907
2908                 # Title object, where $text came from
2909                 $title = NULL;
2910
2911                 $linestart = '';
2912
2913
2914                 # $part1 is the bit before the first |, and must contain only title characters
2915                 # $args is a list of arguments, starting from index 0, not including $part1
2916
2917                 $titleText = $part1 = $piece['title'];
2918                 # If the third subpattern matched anything, it will start with |
2919
2920                 if (null == $piece['parts']) {
2921                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2922                         if ($replaceWith != $piece['text']) {
2923                                 $text = $replaceWith;
2924                                 $found = true;
2925                                 $noparse = true;
2926                                 $noargs = true;
2927                         }
2928                 }
2929
2930                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2931                 wfProfileOut( __METHOD__.'-setup' );
2932
2933                 # SUBST
2934                 wfProfileIn( __METHOD__.'-modifiers' );
2935                 if ( !$found ) {
2936                         $mwSubst =& MagicWord::get( 'subst' );
2937                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2938                                 # One of two possibilities is true:
2939                                 # 1) Found SUBST but not in the PST phase
2940                                 # 2) Didn't find SUBST and in the PST phase
2941                                 # In either case, return without further processing
2942                                 $text = $piece['text'];
2943                                 $found = true;
2944                                 $noparse = true;
2945                                 $noargs = true;
2946                         }
2947                 }
2948
2949                 # MSG, MSGNW and RAW
2950                 if ( !$found ) {
2951                         # Check for MSGNW:
2952                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2953                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2954                                 $nowiki = true;
2955                         } else {
2956                                 # Remove obsolete MSG:
2957                                 $mwMsg =& MagicWord::get( 'msg' );
2958                                 $mwMsg->matchStartAndRemove( $part1 );
2959                         }
2960
2961                         # Check for RAW:
2962                         $mwRaw =& MagicWord::get( 'raw' );
2963                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2964                                 $forceRawInterwiki = true;
2965                         }
2966                 }
2967                 wfProfileOut( __METHOD__.'-modifiers' );
2968
2969                 //save path level before recursing into functions & templates.
2970                 $lastPathLevel = $this->mTemplatePath;
2971
2972                 # Parser functions
2973                 if ( !$found ) {
2974                         wfProfileIn( __METHOD__ . '-pfunc' );
2975
2976                         $colonPos = strpos( $part1, ':' );
2977                         if ( $colonPos !== false ) {
2978                                 # Case sensitive functions
2979                                 $function = substr( $part1, 0, $colonPos );
2980                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2981                                         $function = $this->mFunctionSynonyms[1][$function];
2982                                 } else {
2983                                         # Case insensitive functions
2984                                         $function = strtolower( $function );
2985                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2986                                                 $function = $this->mFunctionSynonyms[0][$function];
2987                                         } else {
2988                                                 $function = false;
2989                                         }
2990                                 }
2991                                 if ( $function ) {
2992                                         $funcArgs = array_map( 'trim', $args );
2993                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
2994                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
2995                                         $found = true;
2996
2997                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
2998                                         //$noargs = true;
2999                                         //$noparse = true;
3000
3001                                         if ( is_array( $result ) ) {
3002                                                 if ( isset( $result[0] ) ) {
3003                                                         $text = $linestart . $result[0];
3004                                                         unset( $result[0] );
3005                                                 }
3006
3007                                                 // Extract flags into the local scope
3008                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
3009                                                 extract( $result );
3010                                         } else {
3011                                                 $text = $linestart . $result;
3012                                         }
3013                                 }
3014                         }
3015                         wfProfileOut( __METHOD__ . '-pfunc' );
3016                 }
3017
3018                 # Template table test
3019
3020                 # Did we encounter this template already? If yes, it is in the cache
3021                 # and we need to check for loops.
3022                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
3023                         $found = true;
3024
3025                         # Infinite loop test
3026                         if ( isset( $this->mTemplatePath[$part1] ) ) {
3027                                 $noparse = true;
3028                                 $noargs = true;
3029                                 $found = true;
3030                                 $text = $linestart .
3031                                         "[[$part1]]<!-- WARNING: template loop detected -->";
3032                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
3033                         } else {
3034                                 # set $text to cached message.
3035                                 $text = $linestart . $this->mTemplates[$piece['title']];
3036                                 #treat title for cached page the same as others
3037                                 $ns = NS_TEMPLATE;
3038                                 $subpage = '';
3039                                 $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3040                                 if ($subpage !== '') {
3041                                   $ns = $this->mTitle->getNamespace();
3042                                 }
3043                                 $title = Title::newFromText( $part1, $ns );
3044                                 //used by include size checking
3045                                 $titleText = $title->getPrefixedText();
3046                                 //used by edit section links
3047                                 $replaceHeadings = true;
3048
3049                         }
3050                 }
3051
3052                 # Load from database
3053                 if ( !$found ) {
3054                         wfProfileIn( __METHOD__ . '-loadtpl' );
3055                         $ns = NS_TEMPLATE;
3056                         # declaring $subpage directly in the function call
3057                         # does not work correctly with references and breaks
3058                         # {{/subpage}}-style inclusions
3059                         $subpage = '';
3060                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3061                         if ($subpage !== '') {
3062                                 $ns = $this->mTitle->getNamespace();
3063                         }
3064                         $title = Title::newFromText( $part1, $ns );
3065
3066
3067                         if ( !is_null( $title ) ) {
3068                                 $titleText = $title->getPrefixedText();
3069                                 # Check for language variants if the template is not found
3070                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3071                                         $wgContLang->findVariantLink($part1, $title);
3072                                 }
3073
3074                                 if ( !$title->isExternal() ) {
3075                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3076                                                 $text = SpecialPage::capturePath( $title );
3077                                                 if ( is_string( $text ) ) {
3078                                                         $found = true;
3079                                                         $noparse = true;
3080                                                         $noargs = true;
3081                                                         $isHTML = true;
3082                                                         $this->disableCache();
3083                                                 }
3084                                         } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3085                                                 $found = false; //access denied
3086                                                 wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3087                                         } else {
3088                                                 $articleContent = $this->fetchTemplate( $title );
3089                                                 if ( $articleContent !== false ) {
3090                                                         $found = true;
3091                                                         $text = $articleContent;
3092                                                         $replaceHeadings = true;
3093                                                 }
3094                                         }
3095
3096                                         # If the title is valid but undisplayable, make a link to it
3097                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3098                                                 $text = "[[:$titleText]]";
3099                                                 $found = true;
3100                                         }
3101                                 } elseif ( $title->isTrans() ) {
3102                                         // Interwiki transclusion
3103                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3104                                                 $text = $this->interwikiTransclude( $title, 'render' );
3105                                                 $isHTML = true;
3106                                                 $noparse = true;
3107                                         } else {
3108                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3109                                                 $replaceHeadings = true;
3110                                         }
3111                                         $found = true;
3112                                 }
3113
3114                                 # Template cache array insertion
3115                                 # Use the original $piece['title'] not the mangled $part1, so that
3116                                 # modifiers such as RAW: produce separate cache entries
3117                                 if( $found ) {
3118                                         if( $isHTML ) {
3119                                                 // A special page; don't store it in the template cache.
3120                                         } else {
3121                                                 $this->mTemplates[$piece['title']] = $text;
3122                                         }
3123                                         $text = $linestart . $text;
3124                                 }
3125                         }
3126                         wfProfileOut( __METHOD__ . '-loadtpl' );
3127                 }
3128
3129                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3130                         # Error, oversize inclusion
3131                         $text = $linestart .
3132                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3133                         $noparse = true;
3134                         $noargs = true;
3135                 }
3136
3137                 # Recursive parsing, escaping and link table handling
3138                 # Only for HTML output
3139                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3140                         $text = wfEscapeWikiText( $text );
3141                 } elseif ( !$this->ot['msg'] && $found ) {
3142                         if ( $noargs ) {
3143                                 $assocArgs = array();
3144                         } else {
3145                                 # Clean up argument array
3146                                 $assocArgs = self::createAssocArgs($args);
3147                                 # Add a new element to the templace recursion path
3148                                 $this->mTemplatePath[$part1] = 1;
3149                         }
3150
3151                         if ( !$noparse ) {
3152                                 # If there are any <onlyinclude> tags, only include them
3153                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3154                                         $replacer = new OnlyIncludeReplacer;
3155                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3156                                                 array( &$replacer, 'replace' ), $text );
3157                                         $text = $replacer->output;
3158                                 }
3159                                 # Remove <noinclude> sections and <includeonly> tags
3160                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3161                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3162
3163                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3164                                         # Strip <nowiki>, <pre>, etc.
3165                                         $text = $this->strip( $text, $this->mStripState );
3166                                         if ( $this->ot['html'] ) {
3167                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3168                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3169                                                 $text = Sanitizer::removeHTMLcomments( $text );
3170                                         }
3171                                 }
3172                                 $text = $this->replaceVariables( $text, $assocArgs );
3173
3174                                 # If the template begins with a table or block-level
3175                                 # element, it should be treated as beginning a new line.
3176                                 if (!$piece['lineStart'] && preg_match('/^({\\||:|;|#|\*)/', $text)) /*}*/{
3177                                         $text = "\n" . $text;
3178                                 }
3179                         } elseif ( !$noargs ) {
3180                                 # $noparse and !$noargs
3181                                 # Just replace the arguments, not any double-brace items
3182                                 # This is used for rendered interwiki transclusion
3183                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3184                         }
3185                 }
3186                 # Prune lower levels off the recursion check path
3187                 $this->mTemplatePath = $lastPathLevel;
3188
3189                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3190                         # Error, oversize inclusion
3191                         $text = $linestart .
3192                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3193                         $noparse = true;
3194                         $noargs = true;
3195                 }
3196
3197                 if ( !$found ) {
3198                         wfProfileOut( $fname );
3199                         return $piece['text'];
3200                 } else {
3201                         wfProfileIn( __METHOD__ . '-placeholders' );
3202                         if ( $isHTML ) {
3203                                 # Replace raw HTML by a placeholder
3204                                 # Add a blank line preceding, to prevent it from mucking up
3205                                 # immediately preceding headings
3206                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3207                         } else {
3208                                 # replace ==section headers==
3209                                 # XXX this needs to go away once we have a better parser.
3210                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3211                                         if( !is_null( $title ) )
3212                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3213                                         else
3214                                                 $encodedname = base64_encode("");
3215                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3216                                                 PREG_SPLIT_DELIM_CAPTURE);
3217                                         $text = '';
3218                                         $nsec = $headingOffset;
3219                                         for( $i = 0; $i < count($m); $i += 2 ) {
3220                                                 $text .= $m[$i];
3221                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3222                                                 $hl = $m[$i + 1];
3223                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3224                                                         $text .= $hl;
3225                                                         continue;
3226                                                 }
3227                                                 $m2 = array();
3228                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3229                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3230                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3231
3232                                                 $nsec++;
3233                                         }
3234                                 }
3235                         }
3236                         wfProfileOut( __METHOD__ . '-placeholders' );
3237                 }
3238
3239                 # Prune lower levels off the recursion check path
3240                 $this->mTemplatePath = $lastPathLevel;
3241
3242                 if ( !$found ) {
3243                         wfProfileOut( $fname );
3244                         return $piece['text'];
3245                 } else {
3246                         wfProfileOut( $fname );
3247                         return $text;
3248                 }
3249         }
3250
3251         /**
3252          * Fetch the unparsed text of a template and register a reference to it.
3253          */
3254         function fetchTemplate( $title ) {
3255                 $text = false;
3256                 // Loop to fetch the article, with up to 1 redirect
3257                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3258                         $rev = Revision::newFromTitle( $title );
3259                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3260                         if ( $rev ) {
3261                                 $text = $rev->getText();
3262                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3263                                 global $wgLang;
3264                                 $message = $wgLang->lcfirst( $title->getText() );
3265                                 $text = wfMsgForContentNoTrans( $message );
3266                                 if( wfEmptyMsg( $message, $text ) ) {
3267                                         $text = false;
3268                                         break;
3269                                 }
3270                         } else {
3271                                 break;
3272                         }
3273                         if ( $text === false ) {
3274                                 break;
3275                         }
3276                         // Redirect?
3277                         $title = Title::newFromRedirect( $text );
3278                 }
3279                 return $text;
3280         }
3281
3282         /**
3283          * Transclude an interwiki link.
3284          */
3285         function interwikiTransclude( $title, $action ) {
3286                 global $wgEnableScaryTranscluding;
3287
3288                 if (!$wgEnableScaryTranscluding)
3289                         return wfMsg('scarytranscludedisabled');
3290
3291                 $url = $title->getFullUrl( "action=$action" );
3292
3293                 if (strlen($url) > 255)
3294                         return wfMsg('scarytranscludetoolong');
3295                 return $this->fetchScaryTemplateMaybeFromCache($url);
3296         }
3297
3298         function fetchScaryTemplateMaybeFromCache($url) {
3299                 global $wgTranscludeCacheExpiry;
3300                 $dbr = wfGetDB(DB_SLAVE);
3301                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3302                                 array('tc_url' => $url));
3303                 if ($obj) {
3304                         $time = $obj->tc_time;
3305                         $text = $obj->tc_contents;
3306                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3307                                 return $text;
3308                         }
3309                 }
3310
3311                 $text = Http::get($url);
3312                 if (!$text)
3313                         return wfMsg('scarytranscludefailed', $url);
3314
3315                 $dbw = wfGetDB(DB_MASTER);
3316                 $dbw->replace('transcache', array('tc_url'), array(
3317                         'tc_url' => $url,
3318                         'tc_time' => time(),
3319                         'tc_contents' => $text));
3320                 return $text;
3321         }
3322
3323
3324         /**
3325          * Triple brace replacement -- used for template arguments
3326          * @private
3327          */
3328         function argSubstitution( $matches ) {
3329                 $arg = trim( $matches['title'] );
3330                 $text = $matches['text'];
3331                 $inputArgs = end( $this->mArgStack );
3332
3333                 if ( array_key_exists( $arg, $inputArgs ) ) {
3334                         $text = $inputArgs[$arg];
3335                 } else if (($this->mOutputType == OT_HTML || $this->mOutputType == OT_PREPROCESS ) &&
3336                 null != $matches['parts'] && count($matches['parts']) > 0) {
3337                         $text = $matches['parts'][0];
3338                 }
3339                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3340                         $text = $matches['text'] .
3341                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3342                 }
3343
3344                 return $text;
3345         }
3346
3347         /**
3348          * Increment an include size counter
3349          *
3350          * @param string $type The type of expansion
3351          * @param integer $size The size of the text
3352          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3353          */
3354         function incrementIncludeSize( $type, $size ) {
3355                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3356                         return false;
3357                 } else {
3358                         $this->mIncludeSizes[$type] += $size;
3359                         return true;
3360                 }
3361         }
3362
3363         /**
3364          * Detect __NOGALLERY__ magic word and set a placeholder
3365          */
3366         function stripNoGallery( &$text ) {
3367                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3368                 # do not add TOC
3369                 $mw = MagicWord::get( 'nogallery' );
3370                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3371         }
3372
3373         /**
3374          * Detect __TOC__ magic word and set a placeholder
3375          */
3376         function stripToc( $text ) {
3377                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3378                 # do not add TOC
3379                 $mw = MagicWord::get( 'notoc' );
3380                 if( $mw->matchAndRemove( $text ) ) {
3381                         $this->mShowToc = false;
3382                 }
3383
3384                 $mw = MagicWord::get( 'toc' );
3385                 if( $mw->match( $text ) ) {
3386                         $this->mShowToc = true;
3387                         $this->mForceTocPosition = true;
3388
3389                         // Set a placeholder. At the end we'll fill it in with the TOC.
3390                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3391
3392                         // Only keep the first one.
3393                         $text = $mw->replace( '', $text );
3394                 }
3395                 return $text;
3396         }
3397
3398         /**
3399          * This function accomplishes several tasks:
3400          * 1) Auto-number headings if that option is enabled
3401          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3402          * 3) Add a Table of contents on the top for users who have enabled the option
3403          * 4) Auto-anchor headings
3404          *
3405          * It loops through all headlines, collects the necessary data, then splits up the
3406          * string and re-inserts the newly formatted headlines.
3407          *
3408          * @param string $text
3409          * @param boolean $isMain
3410          * @private
3411          */
3412         function formatHeadings( $text, $isMain=true ) {
3413                 global $wgMaxTocLevel, $wgContLang;
3414
3415                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3416                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3417                         $showEditLink = 0;
3418                 } else {
3419                         $showEditLink = $this->mOptions->getEditSection();
3420                 }
3421
3422                 # Inhibit editsection links if requested in the page
3423                 $esw =& MagicWord::get( 'noeditsection' );
3424                 if( $esw->matchAndRemove( $text ) ) {
3425                         $showEditLink = 0;
3426                 }
3427
3428                 # Get all headlines for numbering them and adding funky stuff like [edit]
3429                 # links - this is for later, but we need the number of headlines right now
3430                 $matches = array();
3431                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3432
3433                 # if there are fewer than 4 headlines in the article, do not show TOC
3434                 # unless it's been explicitly enabled.
3435                 $enoughToc = $this->mShowToc &&
3436                         (($numMatches >= 4) || $this->mForceTocPosition);
3437
3438                 # Allow user to stipulate that a page should have a "new section"
3439                 # link added via __NEWSECTIONLINK__
3440                 $mw =& MagicWord::get( 'newsectionlink' );
3441                 if( $mw->matchAndRemove( $text ) )
3442                         $this->mOutput->setNewSection( true );
3443
3444                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3445                 # override above conditions and always show TOC above first header
3446                 $mw =& MagicWord::get( 'forcetoc' );
3447                 if ($mw->matchAndRemove( $text ) ) {
3448                         $this->mShowToc = true;
3449                         $enoughToc = true;
3450                 }
3451
3452                 # Never ever show TOC if no headers
3453                 if( $numMatches < 1 ) {
3454                         $enoughToc = false;
3455                 }
3456
3457                 # We need this to perform operations on the HTML
3458                 $sk = $this->mOptions->getSkin();
3459
3460                 # headline counter
3461                 $headlineCount = 0;
3462                 $sectionCount = 0; # headlineCount excluding template sections
3463
3464                 # Ugh .. the TOC should have neat indentation levels which can be
3465                 # passed to the skin functions. These are determined here
3466                 $toc = '';
3467                 $full = '';
3468                 $head = array();
3469                 $sublevelCount = array();
3470                 $levelCount = array();
3471                 $toclevel = 0;
3472                 $level = 0;
3473                 $prevlevel = 0;
3474                 $toclevel = 0;
3475                 $prevtoclevel = 0;
3476
3477                 foreach( $matches[3] as $headline ) {
3478                         $istemplate = 0;
3479                         $templatetitle = '';
3480                         $templatesection = 0;
3481                         $numbering = '';
3482                         $mat = array();
3483                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3484                                 $istemplate = 1;
3485                                 $templatetitle = base64_decode($mat[1]);
3486                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3487                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3488                         }
3489
3490                         if( $toclevel ) {
3491                                 $prevlevel = $level;
3492                                 $prevtoclevel = $toclevel;
3493                         }
3494                         $level = $matches[1][$headlineCount];
3495
3496                         if( $doNumberHeadings || $enoughToc ) {
3497
3498                                 if ( $level > $prevlevel ) {
3499                                         # Increase TOC level
3500                                         $toclevel++;
3501                                         $sublevelCount[$toclevel] = 0;
3502                                         if( $toclevel<$wgMaxTocLevel ) {
3503                                                 $toc .= $sk->tocIndent();
3504                                         }
3505                                 }
3506                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3507                                         # Decrease TOC level, find level to jump to
3508
3509                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3510                                                 # Can only go down to level 1
3511                                                 $toclevel = 1;
3512                                         } else {
3513                                                 for ($i = $toclevel; $i > 0; $i--) {
3514                                                         if ( $levelCount[$i] == $level ) {
3515                                                                 # Found last matching level
3516                                                                 $toclevel = $i;
3517                                                                 break;
3518                                                         }
3519                                                         elseif ( $levelCount[$i] < $level ) {
3520                                                                 # Found first matching level below current level
3521                                                                 $toclevel = $i + 1;
3522                                                                 break;
3523                                                         }
3524                                                 }
3525                                         }
3526                                         if( $toclevel<$wgMaxTocLevel ) {
3527                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3528                                         }
3529                                 }
3530                                 else {
3531                                         # No change in level, end TOC line
3532                                         if( $toclevel<$wgMaxTocLevel ) {
3533                                                 $toc .= $sk->tocLineEnd();
3534                                         }
3535                                 }
3536
3537                                 $levelCount[$toclevel] = $level;
3538
3539                                 # count number of headlines for each level
3540                                 @$sublevelCount[$toclevel]++;
3541                                 $dot = 0;
3542                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3543                                         if( !empty( $sublevelCount[$i] ) ) {
3544                                                 if( $dot ) {
3545                                                         $numbering .= '.';
3546                                                 }
3547                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3548                                                 $dot = 1;
3549                                         }
3550                                 }
3551                         }
3552
3553                         # The canonized header is a version of the header text safe to use for links
3554                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3555                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3556
3557                         # Remove link placeholders by the link text.
3558                         #     <!--LINK number-->
3559                         # turns into
3560                         #     link text with suffix
3561                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3562                                                             "\$this->mLinkHolders['texts'][\$1]",
3563                                                             $canonized_headline );
3564                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3565                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3566                                                             $canonized_headline );
3567
3568                         # strip out HTML
3569                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3570                         $tocline = trim( $canonized_headline );
3571                         # Save headline for section edit hint before it's escaped
3572                         $headline_hint = trim( $canonized_headline );
3573                         $canonized_headline = Sanitizer::escapeId( $tocline );
3574                         $refers[$headlineCount] = $canonized_headline;
3575
3576                         # count how many in assoc. array so we can track dupes in anchors
3577                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3578                         $refcount[$headlineCount]=$refers[$canonized_headline];
3579
3580                         # Don't number the heading if it is the only one (looks silly)
3581                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3582                                 # the two are different if the line contains a link
3583                                 $headline=$numbering . ' ' . $headline;
3584                         }
3585
3586                         # Create the anchor for linking from the TOC to the section
3587                         $anchor = $canonized_headline;
3588                         if($refcount[$headlineCount] > 1 ) {
3589                                 $anchor .= '_' . $refcount[$headlineCount];
3590                         }
3591                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3592                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3593                         }
3594                         # give headline the correct <h#> tag
3595                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3596                                 if( $istemplate )
3597                                         $editlink = $sk->editSectionLinkForOther($templatetitle, $templatesection);
3598                                 else
3599                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3600                         } else {
3601                                 $editlink = '';
3602                         }
3603                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3604
3605                         $headlineCount++;
3606                         if( !$istemplate )
3607                                 $sectionCount++;
3608                 }
3609
3610                 if( $enoughToc ) {
3611                         if( $toclevel<$wgMaxTocLevel ) {
3612                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3613                         }
3614                         $toc = $sk->tocList( $toc );
3615                 }
3616
3617                 # split up and insert constructed headlines
3618
3619                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3620                 $i = 0;
3621
3622                 foreach( $blocks as $block ) {
3623                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3624                                 # This is the [edit] link that appears for the top block of text when
3625                                 # section editing is enabled
3626
3627                                 # Disabled because it broke block formatting
3628                                 # For example, a bullet point in the top line
3629                                 # $full .= $sk->editSectionLink(0);
3630                         }
3631                         $full .= $block;
3632                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3633                                 # Top anchor now in skin
3634                                 $full = $full.$toc;
3635                         }
3636
3637                         if( !empty( $head[$i] ) ) {
3638                                 $full .= $head[$i];
3639                         }
3640                         $i++;
3641                 }
3642                 if( $this->mForceTocPosition ) {
3643                         return str_replace( '<!--MWTOC-->', $toc, $full );
3644                 } else {
3645                         return $full;
3646                 }
3647         }
3648
3649         /**
3650          * Transform wiki markup when saving a page by doing \r\n -> \n
3651          * conversion, substitting signatures, {{subst:}} templates, etc.
3652          *
3653          * @param string $text the text to transform
3654          * @param Title &$title the Title object for the current article
3655          * @param User &$user the User object describing the current user
3656          * @param ParserOptions $options parsing options
3657          * @param bool $clearState whether to clear the parser state first
3658          * @return string the altered wiki markup
3659          * @public
3660          */
3661         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3662                 $this->mOptions = $options;
3663                 $this->mTitle =& $title;
3664                 $this->setOutputType( OT_WIKI );
3665
3666                 if ( $clearState ) {
3667                         $this->clearState();
3668                 }
3669
3670                 $stripState = new StripState;
3671                 $pairs = array(
3672                         "\r\n" => "\n",
3673                 );
3674                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3675                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3676                 $text = $this->pstPass2( $text, $stripState, $user );
3677                 $text = $stripState->unstripBoth( $text );
3678                 return $text;
3679         }
3680
3681         /**
3682          * Pre-save transform helper function
3683          * @private
3684          */
3685         function pstPass2( $text, &$stripState, $user ) {
3686                 global $wgContLang, $wgLocaltimezone;
3687
3688                 /* Note: This is the timestamp saved as hardcoded wikitext to
3689                  * the database, we use $wgContLang here in order to give
3690                  * everyone the same signature and use the default one rather
3691                  * than the one selected in each user's preferences.
3692                  */
3693                 if ( isset( $wgLocaltimezone ) ) {
3694                         $oldtz = getenv( 'TZ' );
3695                         putenv( 'TZ='.$wgLocaltimezone );
3696                 }
3697                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3698                   ' (' . date( 'T' ) . ')';
3699                 if ( isset( $wgLocaltimezone ) ) {
3700                         putenv( 'TZ='.$oldtz );
3701                 }
3702
3703                 # Variable replacement
3704                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3705                 $text = $this->replaceVariables( $text );
3706
3707                 # Strip out <nowiki> etc. added via replaceVariables
3708                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3709
3710                 # Signatures
3711                 $sigText = $this->getUserSig( $user );
3712                 $text = strtr( $text, array(
3713                         '~~~~~' => $d,
3714                         '~~~~' => "$sigText $d",
3715                         '~~~' => $sigText
3716                 ) );
3717
3718                 # Context links: [[|name]] and [[name (context)|]]
3719                 #
3720                 global $wgLegalTitleChars;
3721                 $tc = "[$wgLegalTitleChars]";
3722                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3723
3724                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3725                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3726                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3727
3728                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3729                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3730                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3731
3732                 $t = $this->mTitle->getText();
3733                 $m = array();
3734                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3735                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3736                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3737                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3738                 } else {
3739                         # if there's no context, don't bother duplicating the title
3740                         $text = preg_replace( $p2, '[[\\1]]', $text );
3741                 }
3742
3743                 # Trim trailing whitespace
3744                 $text = rtrim( $text );
3745
3746                 return $text;
3747         }
3748
3749         /**
3750          * Fetch the user's signature text, if any, and normalize to
3751          * validated, ready-to-insert wikitext.
3752          *
3753          * @param User $user
3754          * @return string
3755          * @private
3756          */
3757         function getUserSig( &$user ) {
3758                 $username = $user->getName();
3759                 $nickname = $user->getOption( 'nickname' );
3760                 $nickname = $nickname === '' ? $username : $nickname;
3761
3762                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3763                         # Sig. might contain markup; validate this
3764                         if( $this->validateSig( $nickname ) !== false ) {
3765                                 # Validated; clean up (if needed) and return it
3766                                 return $this->cleanSig( $nickname, true );
3767                         } else {
3768                                 # Failed to validate; fall back to the default
3769                                 $nickname = $username;
3770                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3771                         }
3772                 }
3773
3774                 // Make sure nickname doesnt get a sig in a sig
3775                 $nickname = $this->cleanSigInSig( $nickname );
3776
3777                 # If we're still here, make it a link to the user page
3778                 $userpage = $user->getUserPage();
3779                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3780         }
3781
3782         /**
3783          * Check that the user's signature contains no bad XML
3784          *
3785          * @param string $text
3786          * @return mixed An expanded string, or false if invalid.
3787          */
3788         function validateSig( $text ) {
3789                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3790         }
3791
3792         /**
3793          * Clean up signature text
3794          *
3795          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3796          * 2) Substitute all transclusions
3797          *
3798          * @param string $text
3799          * @param $parsing Whether we're cleaning (preferences save) or parsing
3800          * @return string Signature text
3801          */
3802         function cleanSig( $text, $parsing = false ) {
3803                 global $wgTitle;
3804                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3805
3806                 $substWord = MagicWord::get( 'subst' );
3807                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3808                 $substText = '{{' . $substWord->getSynonym( 0 );
3809
3810                 $text = preg_replace( $substRegex, $substText, $text );
3811                 $text = $this->cleanSigInSig( $text );
3812                 $text = $this->replaceVariables( $text );
3813
3814                 $this->clearState();
3815                 return $text;
3816         }
3817
3818         /**
3819          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3820          * @param string $text
3821          * @return string Signature text with /~{3,5}/ removed
3822          */
3823         function cleanSigInSig( $text ) {
3824                 $text = preg_replace( '/~{3,5}/', '', $text );
3825                 return $text;
3826         }
3827
3828         /**
3829          * Set up some variables which are usually set up in parse()
3830          * so that an external function can call some class members with confidence
3831          * @public
3832          */
3833         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3834                 $this->mTitle =& $title;
3835                 $this->mOptions = $options;
3836                 $this->setOutputType( $outputType );
3837                 if ( $clearState ) {
3838                         $this->clearState();
3839                 }
3840         }
3841
3842         /**
3843          * Transform a MediaWiki message by replacing magic variables.
3844          *
3845          * @param string $text the text to transform
3846          * @param ParserOptions $options  options
3847          * @return string the text with variables substituted
3848          * @public
3849          */
3850         function transformMsg( $text, $options ) {
3851                 global $wgTitle;
3852                 static $executing = false;
3853
3854                 $fname = "Parser::transformMsg";
3855
3856                 # Guard against infinite recursion
3857                 if ( $executing ) {
3858                         return $text;
3859                 }
3860                 $executing = true;
3861
3862                 wfProfileIn($fname);
3863
3864                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
3865                         $this->mTitle = $wgTitle;
3866                 } else {
3867                         $this->mTitle = Title::newFromText('msg');
3868                 }
3869                 $this->mOptions = $options;
3870                 $this->setOutputType( OT_MSG );
3871                 $this->clearState();
3872                 $text = $this->replaceVariables( $text );
3873
3874                 $executing = false;
3875                 wfProfileOut($fname);
3876                 return $text;
3877         }
3878
3879         /**
3880          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3881          * The callback should have the following form:
3882          *    function myParserHook( $text, $params, &$parser ) { ... }
3883          *
3884          * Transform and return $text. Use $parser for any required context, e.g. use
3885          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3886          *
3887          * @public
3888          *
3889          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3890          * @param mixed $callback The callback function (and object) to use for the tag
3891          *
3892          * @return The old value of the mTagHooks array associated with the hook
3893          */
3894         function setHook( $tag, $callback ) {
3895                 $tag = strtolower( $tag );
3896                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3897                 $this->mTagHooks[$tag] = $callback;
3898
3899                 return $oldVal;
3900         }
3901
3902         /**
3903          * Create a function, e.g. {{sum:1|2|3}}
3904          * The callback function should have the form:
3905          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3906          *
3907          * The callback may either return the text result of the function, or an array with the text
3908          * in element 0, and a number of flags in the other elements. The names of the flags are
3909          * specified in the keys. Valid flags are:
3910          *   found                     The text returned is valid, stop processing the template. This
3911          *                             is on by default.
3912          *   nowiki                    Wiki markup in the return value should be escaped
3913          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3914          *   noargs                    Don't replace triple-brace arguments in the return value
3915          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3916          *
3917          * @public
3918          *
3919          * @param string $id The magic word ID
3920          * @param mixed $callback The callback function (and object) to use
3921          * @param integer $flags a combination of the following flags:
3922          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3923          *
3924          * @return The old callback function for this name, if any
3925          */
3926         function setFunctionHook( $id, $callback, $flags = 0 ) {
3927                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
3928                 $this->mFunctionHooks[$id] = $callback;
3929
3930                 # Add to function cache
3931                 $mw = MagicWord::get( $id );
3932                 if( !$mw )
3933                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3934
3935                 $synonyms = $mw->getSynonyms();
3936                 $sensitive = intval( $mw->isCaseSensitive() );
3937
3938                 foreach ( $synonyms as $syn ) {
3939                         # Case
3940                         if ( !$sensitive ) {
3941                                 $syn = strtolower( $syn );
3942                         }
3943                         # Add leading hash
3944                         if ( !( $flags & SFH_NO_HASH ) ) {
3945                                 $syn = '#' . $syn;
3946                         }
3947                         # Remove trailing colon
3948                         if ( substr( $syn, -1, 1 ) == ':' ) {
3949                                 $syn = substr( $syn, 0, -1 );
3950                         }
3951                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3952                 }
3953                 return $oldVal;
3954         }
3955
3956         /**
3957          * Get all registered function hook identifiers
3958          *
3959          * @return array
3960          */
3961         function getFunctionHooks() {
3962                 return array_keys( $this->mFunctionHooks );
3963         }
3964
3965         /**
3966          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3967          * Placeholders created in Skin::makeLinkObj()
3968          * Returns an array of links found, indexed by PDBK:
3969          *  0 - broken
3970          *  1 - normal link
3971          *  2 - stub
3972          * $options is a bit field, RLH_FOR_UPDATE to select for update
3973          */
3974         function replaceLinkHolders( &$text, $options = 0 ) {
3975                 global $wgUser;
3976                 global $wgContLang;
3977
3978                 $fname = 'Parser::replaceLinkHolders';
3979                 wfProfileIn( $fname );
3980
3981                 $pdbks = array();
3982                 $colours = array();
3983                 $sk = $this->mOptions->getSkin();
3984                 $linkCache =& LinkCache::singleton();
3985
3986                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3987                         wfProfileIn( $fname.'-check' );
3988                         $dbr = wfGetDB( DB_SLAVE );
3989                         $page = $dbr->tableName( 'page' );
3990                         $threshold = $wgUser->getOption('stubthreshold');
3991
3992                         # Sort by namespace
3993                         asort( $this->mLinkHolders['namespaces'] );
3994
3995                         # Generate query
3996                         $query = false;
3997                         $current = null;
3998                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
3999                                 # Make title object
4000                                 $title = $this->mLinkHolders['titles'][$key];
4001
4002                                 # Skip invalid entries.
4003                                 # Result will be ugly, but prevents crash.
4004                                 if ( is_null( $title ) ) {
4005                                         continue;
4006                                 }
4007                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4008
4009                                 # Check if it's a static known link, e.g. interwiki
4010                                 if ( $title->isAlwaysKnown() ) {
4011                                         $colours[$pdbk] = 1;
4012                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4013                                         $colours[$pdbk] = 1;
4014                                         $this->mOutput->addLink( $title, $id );
4015                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4016                                         $colours[$pdbk] = 0;
4017                                 } else {
4018                                         # Not in the link cache, add it to the query
4019                                         if ( !isset( $current ) ) {
4020                                                 $current = $ns;
4021                                                 $query =  "SELECT page_id, page_namespace, page_title";
4022                                                 if ( $threshold > 0 ) {
4023                                                         $query .= ', page_len, page_is_redirect';
4024                                                 }
4025                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4026                                         } elseif ( $current != $ns ) {
4027                                                 $current = $ns;
4028                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4029                                         } else {
4030                                                 $query .= ', ';
4031                                         }
4032
4033                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4034                                 }
4035                         }
4036                         if ( $query ) {
4037                                 $query .= '))';
4038                                 if ( $options & RLH_FOR_UPDATE ) {
4039                                         $query .= ' FOR UPDATE';
4040                                 }
4041
4042                                 $res = $dbr->query( $query, $fname );
4043
4044                                 # Fetch data and form into an associative array
4045                                 # non-existent = broken
4046                                 # 1 = known
4047                                 # 2 = stub
4048                                 while ( $s = $dbr->fetchObject($res) ) {
4049                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4050                                         $pdbk = $title->getPrefixedDBkey();
4051                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4052                                         $this->mOutput->addLink( $title, $s->page_id );
4053
4054                                         if ( $threshold >  0 ) {
4055                                                 $size = $s->page_len;
4056                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4057                                                         $colours[$pdbk] = 1;
4058                                                 } else {
4059                                                         $colours[$pdbk] = 2;
4060                                                 }
4061                                         } else {
4062                                                 $colours[$pdbk] = 1;
4063                                         }
4064                                 }
4065                         }
4066                         wfProfileOut( $fname.'-check' );
4067
4068                         # Do a second query for different language variants of links and categories
4069                         if($wgContLang->hasVariants()){
4070                                 $linkBatch = new LinkBatch();
4071                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4072                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4073                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4074
4075                                 $categories = $this->mOutput->getCategoryLinks();
4076
4077                                 // Add variants of links to link batch
4078                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4079                                         $title = $this->mLinkHolders['titles'][$key];
4080                                         if ( is_null( $title ) )
4081                                                 continue;
4082
4083                                         $pdbk = $title->getPrefixedDBkey();
4084                                         $titleText = $title->getText();
4085
4086                                         // generate all variants of the link title text
4087                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4088
4089                                         // if link was not found (in first query), add all variants to query
4090                                         if ( !isset($colours[$pdbk]) ){
4091                                                 foreach($allTextVariants as $textVariant){
4092                                                         if($textVariant != $titleText){
4093                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4094                                                                 if(is_null($variantTitle)) continue;
4095                                                                 $linkBatch->addObj( $variantTitle );
4096                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4097                                                         }
4098                                                 }
4099                                         }
4100                                 }
4101
4102                                 // process categories, check if a category exists in some variant
4103                                 foreach( $categories as $category){
4104                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4105                                         foreach($variants as $variant){
4106                                                 if($variant != $category){
4107                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4108                                                         if(is_null($variantTitle)) continue;
4109                                                         $linkBatch->addObj( $variantTitle );
4110                                                         $categoryMap[$variant] = $category;
4111                                                 }
4112                                         }
4113                                 }
4114
4115
4116                                 if(!$linkBatch->isEmpty()){
4117                                         // construct query
4118                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4119
4120                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4121                                         if ( $threshold > 0 ) {
4122                                                 $variantQuery .= ', page_len, page_is_redirect';
4123                                         }
4124
4125                                         $variantQuery .= " FROM $page WHERE $titleClause";
4126                                         if ( $options & RLH_FOR_UPDATE ) {
4127                                                 $variantQuery .= ' FOR UPDATE';
4128                                         }
4129
4130                                         $varRes = $dbr->query( $variantQuery, $fname );
4131
4132                                         // for each found variants, figure out link holders and replace
4133                                         while ( $s = $dbr->fetchObject($varRes) ) {
4134
4135                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4136                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4137                                                 $vardbk = $variantTitle->getDBkey();
4138
4139                                                 $holderKeys = array();
4140                                                 if(isset($variantMap[$varPdbk])){
4141                                                         $holderKeys = $variantMap[$varPdbk];
4142                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4143                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4144                                                 }
4145
4146                                                 // loop over link holders
4147                                                 foreach($holderKeys as $key){
4148                                                         $title = $this->mLinkHolders['titles'][$key];
4149                                                         if ( is_null( $title ) ) continue;
4150
4151                                                         $pdbk = $title->getPrefixedDBkey();
4152
4153                                                         if(!isset($colours[$pdbk])){
4154                                                                 // found link in some of the variants, replace the link holder data
4155                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4156                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4157
4158                                                                 // set pdbk and colour
4159                                                                 $pdbks[$key] = $varPdbk;
4160                                                                 if ( $threshold >  0 ) {
4161                                                                         $size = $s->page_len;
4162                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4163                                                                                 $colours[$varPdbk] = 1;
4164                                                                         } else {
4165                                                                                 $colours[$varPdbk] = 2;
4166                                                                         }
4167                                                                 }
4168                                                                 else {
4169                                                                         $colours[$varPdbk] = 1;
4170                                                                 }
4171                                                         }
4172                                                 }
4173
4174                                                 // check if the object is a variant of a category
4175                                                 if(isset($categoryMap[$vardbk])){
4176                                                         $oldkey = $categoryMap[$vardbk];
4177                                                         if($oldkey != $vardbk)
4178                                                                 $varCategories[$oldkey]=$vardbk;
4179                                                 }
4180                                         }
4181
4182                                         // rebuild the categories in original order (if there are replacements)
4183                                         if(count($varCategories)>0){
4184                                                 $newCats = array();
4185                                                 $originalCats = $this->mOutput->getCategories();
4186                                                 foreach($originalCats as $cat => $sortkey){
4187                                                         // make the replacement
4188                                                         if( array_key_exists($cat,$varCategories) )
4189                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4190                                                         else $newCats[$cat] = $sortkey;
4191                                                 }
4192                                                 $this->mOutput->setCategoryLinks($newCats);
4193                                         }
4194                                 }
4195                         }
4196
4197                         # Construct search and replace arrays
4198                         wfProfileIn( $fname.'-construct' );
4199                         $replacePairs = array();
4200                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4201                                 $pdbk = $pdbks[$key];
4202                                 $searchkey = "<!--LINK $key-->";
4203                                 $title = $this->mLinkHolders['titles'][$key];
4204                                 if ( empty( $colours[$pdbk] ) ) {
4205                                         $linkCache->addBadLinkObj( $title );
4206                                         $colours[$pdbk] = 0;
4207                                         $this->mOutput->addLink( $title, 0 );
4208                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4209                                                                         $this->mLinkHolders['texts'][$key],
4210                                                                         $this->mLinkHolders['queries'][$key] );
4211                                 } elseif ( $colours[$pdbk] == 1 ) {
4212                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4213                                                                         $this->mLinkHolders['texts'][$key],
4214                                                                         $this->mLinkHolders['queries'][$key] );
4215                                 } elseif ( $colours[$pdbk] == 2 ) {
4216                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4217                                                                         $this->mLinkHolders['texts'][$key],
4218                                                                         $this->mLinkHolders['queries'][$key] );
4219                                 }
4220                         }
4221                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4222                         wfProfileOut( $fname.'-construct' );
4223
4224                         # Do the thing
4225                         wfProfileIn( $fname.'-replace' );
4226                         $text = preg_replace_callback(
4227                                 '/(<!--LINK .*?-->)/',
4228                                 $replacer->cb(),
4229                                 $text);
4230
4231                         wfProfileOut( $fname.'-replace' );
4232                 }
4233
4234                 # Now process interwiki link holders
4235                 # This is quite a bit simpler than internal links
4236                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4237                         wfProfileIn( $fname.'-interwiki' );
4238                         # Make interwiki link HTML
4239                         $replacePairs = array();
4240                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4241                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4242                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4243                         }
4244                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4245
4246                         $text = preg_replace_callback(
4247                                 '/<!--IWLINK (.*?)-->/',
4248                                 $replacer->cb(),
4249                                 $text );
4250                         wfProfileOut( $fname.'-interwiki' );
4251                 }
4252
4253                 wfProfileOut( $fname );
4254                 return $colours;
4255         }
4256
4257         /**
4258          * Replace <!--LINK--> link placeholders with plain text of links
4259          * (not HTML-formatted).
4260          * @param string $text
4261          * @return string
4262          */
4263         function replaceLinkHoldersText( $text ) {
4264                 $fname = 'Parser::replaceLinkHoldersText';
4265                 wfProfileIn( $fname );
4266
4267                 $text = preg_replace_callback(
4268                         '/<!--(LINK|IWLINK) (.*?)-->/',
4269                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4270                         $text );
4271
4272                 wfProfileOut( $fname );
4273                 return $text;
4274         }
4275
4276         /**
4277          * @param array $matches
4278          * @return string
4279          * @private
4280          */
4281         function replaceLinkHoldersTextCallback( $matches ) {
4282                 $type = $matches[1];
4283                 $key  = $matches[2];
4284                 if( $type == 'LINK' ) {
4285                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4286                                 return $this->mLinkHolders['texts'][$key];
4287                         }
4288                 } elseif( $type == 'IWLINK' ) {
4289                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4290                                 return $this->mInterwikiLinkHolders['texts'][$key];
4291                         }
4292                 }
4293                 return $matches[0];
4294         }
4295
4296         /**
4297          * Tag hook handler for 'pre'.
4298          */
4299         function renderPreTag( $text, $attribs ) {
4300                 // Backwards-compatibility hack
4301                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4302
4303                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4304                 return wfOpenElement( 'pre', $attribs ) .
4305                         Xml::escapeTagsOnly( $content ) .
4306                         '</pre>';
4307         }
4308
4309         /**
4310          * Renders an image gallery from a text with one line per image.
4311          * text labels may be given by using |-style alternative text. E.g.
4312          *   Image:one.jpg|The number "1"
4313          *   Image:tree.jpg|A tree
4314          * given as text will return the HTML of a gallery with two images,
4315          * labeled 'The number "1"' and
4316          * 'A tree'.
4317          */
4318         function renderImageGallery( $text, $params ) {
4319                 $ig = new ImageGallery();
4320                 $ig->setContextTitle( $this->mTitle );
4321                 $ig->setShowBytes( false );
4322                 $ig->setShowFilename( false );
4323                 $ig->setParsing();
4324                 $ig->useSkin( $this->mOptions->getSkin() );
4325
4326                 if( isset( $params['caption'] ) ) {
4327                         $caption = $params['caption'];
4328                         $caption = htmlspecialchars( $caption );
4329                         $caption = $this->replaceInternalLinks( $caption );
4330                         $ig->setCaptionHtml( $caption );
4331                 }
4332                 if( isset( $params['perrow'] ) ) {
4333                         $ig->setPerRow( $params['perrow'] );
4334                 }
4335                 if( isset( $params['widths'] ) ) {
4336                         $ig->setWidths( $params['widths'] );
4337                 }
4338                 if( isset( $params['heights'] ) ) {
4339                         $ig->setHeights( $params['heights'] );
4340                 }
4341
4342                 $lines = explode( "\n", $text );
4343                 foreach ( $lines as $line ) {
4344                         # match lines like these:
4345                         # Image:someimage.jpg|This is some image
4346                         $matches = array();
4347                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4348                         # Skip empty lines
4349                         if ( count( $matches ) == 0 ) {
4350                                 continue;
4351                         }
4352                         $tp = Title::newFromText( $matches[1] );
4353                         $nt =& $tp;
4354                         if( is_null( $nt ) ) {
4355                                 # Bogus title. Ignore these so we don't bomb out later.
4356                                 continue;
4357                         }
4358                         if ( isset( $matches[3] ) ) {
4359                                 $label = $matches[3];
4360                         } else {
4361                                 $label = '';
4362                         }
4363
4364                         $pout = $this->parse( $label,
4365                                 $this->mTitle,
4366                                 $this->mOptions,
4367                                 false, // Strip whitespace...?
4368                                 false  // Don't clear state!
4369                         );
4370                         $html = $pout->getText();
4371
4372                         $ig->add( new Image( $nt ), $html );
4373
4374                         # Only add real images (bug #5586)
4375                         if ( $nt->getNamespace() == NS_IMAGE ) {
4376                                 $this->mOutput->addImage( $nt->getDBkey() );
4377                         }
4378                 }
4379                 return $ig->toHTML();
4380         }
4381
4382         /**
4383          * Parse image options text and use it to make an image
4384          */
4385         function makeImage( $nt, $options ) {
4386                 global $wgUseImageResize, $wgDjvuRenderer;
4387
4388                 # Check if the options text is of the form "options|alt text"
4389                 # Options are:
4390                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4391                 #  * left               no resizing, just left align. label is used for alt= only
4392                 #  * right              same, but right aligned
4393                 #  * none               same, but not aligned
4394                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4395                 #  * center             center the image
4396                 #  * framed             Keep original image size, no magnify-button.
4397                 # vertical-align values (no % or length right now):
4398                 #  * baseline
4399                 #  * sub
4400                 #  * super
4401                 #  * top
4402                 #  * text-top
4403                 #  * middle
4404                 #  * bottom
4405                 #  * text-bottom
4406
4407                 $part = array_map( 'trim', explode( '|', $options) );
4408
4409                 $mwAlign = array();
4410                 $alignments = array( 'left', 'right', 'center', 'none', 'baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom' );
4411                 foreach ( $alignments as $alignment ) {
4412                         $mwAlign[$alignment] =& MagicWord::get( 'img_'.$alignment );
4413                 }
4414                 $mwThumb  =& MagicWord::get( 'img_thumbnail' );
4415                 $mwManualThumb =& MagicWord::get( 'img_manualthumb' );
4416                 $mwWidth  =& MagicWord::get( 'img_width' );
4417                 $mwFramed =& MagicWord::get( 'img_framed' );
4418                 $mwPage   =& MagicWord::get( 'img_page' );
4419                 $caption = '';
4420
4421                 $width = $height = $framed = $thumb = false;
4422                 $page = null;
4423                 $manual_thumb = '' ;
4424                 $align = $valign = '';
4425
4426                 foreach( $part as $val ) {
4427                         if ( $wgUseImageResize && ! is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4428                                 $thumb=true;
4429                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4430                                 # use manually specified thumbnail
4431                                 $thumb=true;
4432                                 $manual_thumb = $match;
4433                         } else {
4434                                 foreach( $alignments as $alignment ) {
4435                                         if ( ! is_null( $mwAlign[$alignment]->matchVariableStartToEnd($val) ) ) {
4436                                                 switch ( $alignment ) {
4437                                                         case 'left': case 'right': case 'center': case 'none':
4438                                                                 $align = $alignment; break;
4439                                                         default:
4440                                                                 $valign = $alignment;
4441                                                 }
4442                                                 continue 2;
4443                                         }
4444                                 }
4445                                 if ( isset( $wgDjvuRenderer ) && $wgDjvuRenderer
4446                                 && ! is_null( $match = $mwPage->matchVariableStartToEnd($val) ) ) {
4447                                         # Select a page in a multipage document
4448                                         $page = $match;
4449                                 } elseif ( $wgUseImageResize && !$width && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4450                                         wfDebug( "img_width match: $match\n" );
4451                                         # $match is the image width in pixels
4452                                         $m = array();
4453                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4454                                                 $width = intval( $m[1] );
4455                                                 $height = intval( $m[2] );
4456                                         } else {
4457                                                 $width = intval($match);
4458                                         }
4459                                 } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4460                                         $framed=true;
4461                                 } else {
4462                                         $caption = $val;
4463                                 }
4464                         }
4465                 }
4466                 # Strip bad stuff out of the alt text
4467                 $alt = $this->replaceLinkHoldersText( $caption );
4468
4469                 # make sure there are no placeholders in thumbnail attributes
4470                 # that are later expanded to html- so expand them now and
4471                 # remove the tags
4472                 $alt = $this->mStripState->unstripBoth( $alt );
4473                 $alt = Sanitizer::stripAllTags( $alt );
4474
4475                 # Linker does the rest
4476                 $sk = $this->mOptions->getSkin();
4477                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $width, $height, $framed, $thumb, $manual_thumb, $page, $valign );
4478         }
4479
4480         /**
4481          * Set a flag in the output object indicating that the content is dynamic and
4482          * shouldn't be cached.
4483          */
4484         function disableCache() {
4485                 wfDebug( "Parser output marked as uncacheable.\n" );
4486                 $this->mOutput->mCacheTime = -1;
4487         }
4488
4489         /**#@+
4490          * Callback from the Sanitizer for expanding items found in HTML attribute
4491          * values, so they can be safely tested and escaped.
4492          * @param string $text
4493          * @param array $args
4494          * @return string
4495          * @private
4496          */
4497         function attributeStripCallback( &$text, $args ) {
4498                 $text = $this->replaceVariables( $text, $args );
4499                 $text = $this->mStripState->unstripBoth( $text );
4500                 return $text;
4501         }
4502
4503         /**#@-*/
4504
4505         /**#@+
4506          * Accessor/mutator
4507          */
4508         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4509         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4510         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4511         /**#@-*/
4512
4513         /**#@+
4514          * Accessor
4515          */
4516         function getTags() { return array_keys( $this->mTagHooks ); }
4517         /**#@-*/
4518
4519
4520         /**
4521          * Break wikitext input into sections, and either pull or replace
4522          * some particular section's text.
4523          *
4524          * External callers should use the getSection and replaceSection methods.
4525          *
4526          * @param $text Page wikitext
4527          * @param $section Numbered section. 0 pulls the text before the first
4528          *                 heading; other numbers will pull the given section
4529          *                 along with its lower-level subsections.
4530          * @param $mode One of "get" or "replace"
4531          * @param $newtext Replacement text for section data.
4532          * @return string for "get", the extracted section text.
4533          *                for "replace", the whole page with the section replaced.
4534          */
4535         private function extractSections( $text, $section, $mode, $newtext='' ) {
4536                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4537                 # comments to be stripped as well)
4538                 $stripState = new StripState;
4539
4540                 $oldOutputType = $this->mOutputType;
4541                 $oldOptions = $this->mOptions;
4542                 $this->mOptions = new ParserOptions();
4543                 $this->setOutputType( OT_WIKI );
4544
4545                 $striptext = $this->strip( $text, $stripState, true );
4546
4547                 $this->setOutputType( $oldOutputType );
4548                 $this->mOptions = $oldOptions;
4549
4550                 # now that we can be sure that no pseudo-sections are in the source,
4551                 # split it up by section
4552                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4553                 $comment = "(?:$uniq-!--.*?QINU)";
4554                 $secs = preg_split(
4555                         "/
4556                         (
4557                                 ^
4558                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4559                                 (=+) # Should this be limited to 6?
4560                                 .+?  # Section title...
4561                                 \\2  # Ending = count must match start
4562                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4563                                 $
4564                         |
4565                                 <h([1-6])\b.*?>
4566                                 .*?
4567                                 <\/h\\3\s*>
4568                         )
4569                         /mix",
4570                         $striptext, -1,
4571                         PREG_SPLIT_DELIM_CAPTURE);
4572
4573                 if( $mode == "get" ) {
4574                         if( $section == 0 ) {
4575                                 // "Section 0" returns the content before any other section.
4576                                 $rv = $secs[0];
4577                         } else {
4578                                 //track missing section, will replace if found.
4579                                 $rv = $newtext;
4580                         }
4581                 } elseif( $mode == "replace" ) {
4582                         if( $section == 0 ) {
4583                                 $rv = $newtext . "\n\n";
4584                                 $remainder = true;
4585                         } else {
4586                                 $rv = $secs[0];
4587                                 $remainder = false;
4588                         }
4589                 }
4590                 $count = 0;
4591                 $sectionLevel = 0;
4592                 for( $index = 1; $index < count( $secs ); ) {
4593                         $headerLine = $secs[$index++];
4594                         if( $secs[$index] ) {
4595                                 // A wiki header
4596                                 $headerLevel = strlen( $secs[$index++] );
4597                         } else {
4598                                 // An HTML header
4599                                 $index++;
4600                                 $headerLevel = intval( $secs[$index++] );
4601                         }
4602                         $content = $secs[$index++];
4603
4604                         $count++;
4605                         if( $mode == "get" ) {
4606                                 if( $count == $section ) {
4607                                         $rv = $headerLine . $content;
4608                                         $sectionLevel = $headerLevel;
4609                                 } elseif( $count > $section ) {
4610                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4611                                                 $rv .= $headerLine . $content;
4612                                         } else {
4613                                                 // Broke out to a higher-level section
4614                                                 break;
4615                                         }
4616                                 }
4617                         } elseif( $mode == "replace" ) {
4618                                 if( $count < $section ) {
4619                                         $rv .= $headerLine . $content;
4620                                 } elseif( $count == $section ) {
4621                                         $rv .= $newtext . "\n\n";
4622                                         $sectionLevel = $headerLevel;
4623                                 } elseif( $count > $section ) {
4624                                         if( $headerLevel <= $sectionLevel ) {
4625                                                 // Passed the section's sub-parts.
4626                                                 $remainder = true;
4627                                         }
4628                                         if( $remainder ) {
4629                                                 $rv .= $headerLine . $content;
4630                                         }
4631                                 }
4632                         }
4633                 }
4634                 if (is_string($rv))
4635                         # reinsert stripped tags
4636                         $rv = trim( $stripState->unstripBoth( $rv ) );
4637
4638                 return $rv;
4639         }
4640
4641         /**
4642          * This function returns the text of a section, specified by a number ($section).
4643          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4644          * the first section before any such heading (section 0).
4645          *
4646          * If a section contains subsections, these are also returned.
4647          *
4648          * @param $text String: text to look in
4649          * @param $section Integer: section number
4650          * @param $deftext: default to return if section is not found
4651          * @return string text of the requested section
4652          */
4653         public function getSection( $text, $section, $deftext='' ) {
4654                 return $this->extractSections( $text, $section, "get", $deftext );
4655         }
4656
4657         public function replaceSection( $oldtext, $section, $text ) {
4658                 return $this->extractSections( $oldtext, $section, "replace", $text );
4659         }
4660
4661         /**
4662          * Get the timestamp associated with the current revision, adjusted for
4663          * the default server-local timestamp
4664          */
4665         function getRevisionTimestamp() {
4666                 if ( is_null( $this->mRevisionTimestamp ) ) {
4667                         wfProfileIn( __METHOD__ );
4668                         global $wgContLang;
4669                         $dbr = wfGetDB( DB_SLAVE );
4670                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4671                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4672
4673                         // Normalize timestamp to internal MW format for timezone processing.
4674                         // This has the added side-effect of replacing a null value with
4675                         // the current time, which gives us more sensible behavior for
4676                         // previews.
4677                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4678
4679                         // The cryptic '' timezone parameter tells to use the site-default
4680                         // timezone offset instead of the user settings.
4681                         //
4682                         // Since this value will be saved into the parser cache, served
4683                         // to other users, and potentially even used inside links and such,
4684                         // it needs to be consistent for all visitors.
4685                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4686
4687                         wfProfileOut( __METHOD__ );
4688                 }
4689                 return $this->mRevisionTimestamp;
4690         }
4691
4692         /**
4693          * Mutator for $mDefaultSort
4694          *
4695          * @param $sort New value
4696          */
4697         public function setDefaultSort( $sort ) {
4698                 $this->mDefaultSort = $sort;
4699         }
4700
4701         /**
4702          * Accessor for $mDefaultSort
4703          * Will use the title/prefixed title if none is set
4704          *
4705          * @return string
4706          */
4707         public function getDefaultSort() {
4708                 if( $this->mDefaultSort !== false ) {
4709                         return $this->mDefaultSort;
4710                 } else {
4711                         return $this->mTitle->getNamespace() == NS_CATEGORY
4712                                         ? $this->mTitle->getText()
4713                                         : $this->mTitle->getPrefixedText();
4714                 }
4715         }
4716
4717 }
4718
4719 /**
4720  * @todo document, briefly.
4721  */
4722 class OnlyIncludeReplacer {
4723         var $output = '';
4724
4725         function replace( $matches ) {
4726                 if ( substr( $matches[1], -1 ) == "\n" ) {
4727                         $this->output .= substr( $matches[1], 0, -1 );
4728                 } else {
4729                         $this->output .= $matches[1];
4730                 }
4731         }
4732 }
4733
4734 /**
4735  * @todo document, briefly.
4736  */
4737 class StripState {
4738         var $general, $nowiki;
4739
4740         function __construct() {
4741                 $this->general = new ReplacementArray;
4742                 $this->nowiki = new ReplacementArray;
4743         }
4744
4745         function unstripGeneral( $text ) {
4746                 wfProfileIn( __METHOD__ );
4747                 $text = $this->general->replace( $text );
4748                 wfProfileOut( __METHOD__ );
4749                 return $text;
4750         }
4751
4752         function unstripNoWiki( $text ) {
4753                 wfProfileIn( __METHOD__ );
4754                 $text = $this->nowiki->replace( $text );
4755                 wfProfileOut( __METHOD__ );
4756                 return $text;
4757         }
4758
4759         function unstripBoth( $text ) {
4760                 wfProfileIn( __METHOD__ );
4761                 $text = $this->general->replace( $text );
4762                 $text = $this->nowiki->replace( $text );
4763                 wfProfileOut( __METHOD__ );
4764                 return $text;
4765         }
4766 }
4767
4768 ?>