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  * @addtogroup Parser
  90  */
  91 class Parser
  92 {
  93         const VERSION = MW_PARSER_VERSION;
  94         /**#@+
  95          * @private
  96          */
  97         # Persistent:
  98         var $mTagHooks, $mFunctionHooks, $mFunctionSynonyms, $mVariables;
  99
 100         # Cleared with clearState():
 101         var $mOutput, $mAutonumber, $mDTopen, $mStripState;
 102         var $mIncludeCount, $mArgStack, $mLastSection, $mInPre;
 103         var $mInterwikiLinkHolders, $mLinkHolders, $mUniqPrefix;
 104         var $mIncludeSizes, $mDefaultSort;
 105         var $mTemplates,        // cache of already loaded templates, avoids
 106                                 // multiple SQL queries for the same string
 107             $mTemplatePath;     // stores an unsorted hash of all the templates already loaded
 108                                 // in this path. Used for loop detection.
 109
 110         # Temporary
 111         # These are variables reset at least once per parse regardless of $clearState
 112         var $mOptions,      // ParserOptions object
 113                 $mTitle,        // Title context, used for self-link rendering and similar things
 114                 $mOutputType,   // Output type, one of the OT_xxx constants
 115                 $ot,            // Shortcut alias, see setOutputType()
 116                 $mRevisionId,   // ID to display in {{REVISIONID}} tags
 117                 $mRevisionTimestamp, // The timestamp of the specified revision ID
 118                 $mRevIdForTs;   // The revision ID which was used to fetch the timestamp
 119
 120         /**#@-*/
 121
 122         /**
 123          * Constructor
 124          *
 125          * @public
 126          */
 127         function Parser() {
 128                 $this->mTagHooks = array();
 129                 $this->mFunctionHooks = array();
 130                 $this->mFunctionSynonyms = array( 0 => array(), 1 => array() );
 131                 $this->mFirstCall = true;
 132         }
 133
 134         /**
 135          * Do various kinds of initialisation on the first call of the parser
 136          */
 137         function firstCallInit() {
 138                 if ( !$this->mFirstCall ) {
 139                         return;
 140                 }
 141
 142                 wfProfileIn( __METHOD__ );
 143                 global $wgAllowDisplayTitle, $wgAllowSlowParserFunctions;
 144
 145                 $this->setHook( 'pre', array( $this, 'renderPreTag' ) );
 146
 147                 $this->setFunctionHook( 'int', array( 'CoreParserFunctions', 'intFunction' ), SFH_NO_HASH );
 148                 $this->setFunctionHook( 'ns', array( 'CoreParserFunctions', 'ns' ), SFH_NO_HASH );
 149                 $this->setFunctionHook( 'urlencode', array( 'CoreParserFunctions', 'urlencode' ), SFH_NO_HASH );
 150                 $this->setFunctionHook( 'lcfirst', array( 'CoreParserFunctions', 'lcfirst' ), SFH_NO_HASH );
 151                 $this->setFunctionHook( 'ucfirst', array( 'CoreParserFunctions', 'ucfirst' ), SFH_NO_HASH );
 152                 $this->setFunctionHook( 'lc', array( 'CoreParserFunctions', 'lc' ), SFH_NO_HASH );
 153                 $this->setFunctionHook( 'uc', array( 'CoreParserFunctions', 'uc' ), SFH_NO_HASH );
 154                 $this->setFunctionHook( 'localurl', array( 'CoreParserFunctions', 'localurl' ), SFH_NO_HASH );
 155                 $this->setFunctionHook( 'localurle', array( 'CoreParserFunctions', 'localurle' ), SFH_NO_HASH );
 156                 $this->setFunctionHook( 'fullurl', array( 'CoreParserFunctions', 'fullurl' ), SFH_NO_HASH );
 157                 $this->setFunctionHook( 'fullurle', array( 'CoreParserFunctions', 'fullurle' ), SFH_NO_HASH );
 158                 $this->setFunctionHook( 'formatnum', array( 'CoreParserFunctions', 'formatnum' ), SFH_NO_HASH );
 159                 $this->setFunctionHook( 'grammar', array( 'CoreParserFunctions', 'grammar' ), SFH_NO_HASH );
 160                 $this->setFunctionHook( 'plural', array( 'CoreParserFunctions', 'plural' ), SFH_NO_HASH );
 161                 $this->setFunctionHook( 'numberofpages', array( 'CoreParserFunctions', 'numberofpages' ), SFH_NO_HASH );
 162                 $this->setFunctionHook( 'numberofusers', array( 'CoreParserFunctions', 'numberofusers' ), SFH_NO_HASH );
 163                 $this->setFunctionHook( 'numberofarticles', array( 'CoreParserFunctions', 'numberofarticles' ), SFH_NO_HASH );
 164                 $this->setFunctionHook( 'numberoffiles', array( 'CoreParserFunctions', 'numberoffiles' ), SFH_NO_HASH );
 165                 $this->setFunctionHook( 'numberofadmins', array( 'CoreParserFunctions', 'numberofadmins' ), SFH_NO_HASH );
 166                 $this->setFunctionHook( 'numberofedits', array( 'CoreParserFunctions', 'numberofedits' ), SFH_NO_HASH );
 167                 $this->setFunctionHook( 'language', array( 'CoreParserFunctions', 'language' ), SFH_NO_HASH );
 168                 $this->setFunctionHook( 'padleft', array( 'CoreParserFunctions', 'padleft' ), SFH_NO_HASH );
 169                 $this->setFunctionHook( 'padright', array( 'CoreParserFunctions', 'padright' ), SFH_NO_HASH );
 170                 $this->setFunctionHook( 'anchorencode', array( 'CoreParserFunctions', 'anchorencode' ), SFH_NO_HASH );
 171                 $this->setFunctionHook( 'special', array( 'CoreParserFunctions', 'special' ) );
 172                 $this->setFunctionHook( 'defaultsort', array( 'CoreParserFunctions', 'defaultsort' ), SFH_NO_HASH );
 173
 174                 if ( $wgAllowDisplayTitle ) {
 175                         $this->setFunctionHook( 'displaytitle', array( 'CoreParserFunctions', 'displaytitle' ), SFH_NO_HASH );
 176                 }
 177                 if ( $wgAllowSlowParserFunctions ) {
 178                         $this->setFunctionHook( 'pagesinnamespace', array( 'CoreParserFunctions', 'pagesinnamespace' ), SFH_NO_HASH );
 179                 }
 180
 181                 $this->initialiseVariables();
 182                 $this->mFirstCall = false;
 183                 wfProfileOut( __METHOD__ );
 184         }
 185
 186         /**
 187          * Clear Parser state
 188          *
 189          * @private
 190          */
 191         function clearState() {
 192                 wfProfileIn( __METHOD__ );
 193                 if ( $this->mFirstCall ) {
 194                         $this->firstCallInit();
 195                 }
 196                 $this->mOutput = new ParserOutput;
 197                 $this->mAutonumber = 0;
 198                 $this->mLastSection = '';
 199                 $this->mDTopen = false;
 200                 $this->mIncludeCount = array();
 201                 $this->mStripState = new StripState;
 202                 $this->mArgStack = array();
 203                 $this->mInPre = false;
 204                 $this->mInterwikiLinkHolders = array(
 205                         'texts' => array(),
 206                         'titles' => array()
 207                 );
 208                 $this->mLinkHolders = array(
 209                         'namespaces' => array(),
 210                         'dbkeys' => array(),
 211                         'queries' => array(),
 212                         'texts' => array(),
 213                         'titles' => array()
 214                 );
 215                 $this->mRevisionTimestamp = $this->mRevisionId = null;
 216
 217                 /**
 218                  * Prefix for temporary replacement strings for the multipass parser.
 219                  * \x07 should never appear in input as it's disallowed in XML.
 220                  * Using it at the front also gives us a little extra robustness
 221                  * since it shouldn't match when butted up against identifier-like
 222                  * string constructs.
 223                  */
 224                 $this->mUniqPrefix = "\x07UNIQ" . Parser::getRandomString();
 225
 226                 # Clear these on every parse, bug 4549
 227                 $this->mTemplates = array();
 228                 $this->mTemplatePath = array();
 229
 230                 $this->mShowToc = true;
 231                 $this->mForceTocPosition = false;
 232                 $this->mIncludeSizes = array(
 233                         'pre-expand' => 0,
 234                         'post-expand' => 0,
 235                         'arg' => 0
 236                 );
 237                 $this->mDefaultSort = false;
 238
 239                 wfRunHooks( 'ParserClearState', array( &$this ) );
 240                 wfProfileOut( __METHOD__ );
 241         }
 242
 243         function setOutputType( $ot ) {
 244                 $this->mOutputType = $ot;
 245                 // Shortcut alias
 246                 $this->ot = array(
 247                         'html' => $ot == OT_HTML,
 248                         'wiki' => $ot == OT_WIKI,
 249                         'msg' => $ot == OT_MSG,
 250                         'pre' => $ot == OT_PREPROCESS,
 251                 );
 252         }
 253
 254         /**
 255          * Accessor for mUniqPrefix.
 256          *
 257          * @public
 258          */
 259         function uniqPrefix() {
 260                 return $this->mUniqPrefix;
 261         }
 262
 263         /**
 264          * Convert wikitext to HTML
 265          * Do not call this function recursively.
 266          *
 267          * @param string $text Text we want to parse
 268          * @param Title &$title A title object
 269          * @param array $options
 270          * @param boolean $linestart
 271          * @param boolean $clearState
 272          * @param int $revid number to pass in {{REVISIONID}}
 273          * @return ParserOutput a ParserOutput
 274          */
 275         public function parse( $text, &$title, $options, $linestart = true, $clearState = true, $revid = null ) {
 276                 /**
 277                  * First pass--just handle <nowiki> sections, pass the rest off
 278                  * to internalParse() which does all the real work.
 279                  */
 280
 281                 global $wgUseTidy, $wgAlwaysUseTidy, $wgContLang;
 282                 $fname = 'Parser::parse-' . wfGetCaller();
 283                 wfProfileIn( __METHOD__ );
 284                 wfProfileIn( $fname );
 285
 286                 if ( $clearState ) {
 287                         $this->clearState();
 288                 }
 289
 290                 $this->mOptions = $options;
 291                 $this->mTitle =& $title;
 292                 $oldRevisionId = $this->mRevisionId;
 293                 $oldRevisionTimestamp = $this->mRevisionTimestamp;
 294                 if( $revid !== null ) {
 295                         $this->mRevisionId = $revid;
 296                         $this->mRevisionTimestamp = null;
 297                 }
 298                 $this->setOutputType( OT_HTML );
 299                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 300                 $text = $this->strip( $text, $this->mStripState );
 301                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 302                 $text = $this->internalParse( $text );
 303                 $text = $this->mStripState->unstripGeneral( $text );
 304
 305                 # Clean up special characters, only run once, next-to-last before doBlockLevels
 306                 $fixtags = array(
 307                         # french spaces, last one Guillemet-left
 308                         # only if there is something before the space
 309                         '/(.) (?=\\?|:|;|!|\\302\\273)/' => '\\1&nbsp;\\2',
 310                         # french spaces, Guillemet-right
 311                         '/(\\302\\253) /' => '\\1&nbsp;',
 312                 );
 313                 $text = preg_replace( array_keys($fixtags), array_values($fixtags), $text );
 314
 315                 # only once and last
 316                 $text = $this->doBlockLevels( $text, $linestart );
 317
 318                 $this->replaceLinkHolders( $text );
 319
 320                 # the position of the parserConvert() call should not be changed. it
 321                 # assumes that the links are all replaced and the only thing left
 322                 # is the <nowiki> mark.
 323                 # Side-effects: this calls $this->mOutput->setTitleText()
 324                 $text = $wgContLang->parserConvert( $text, $this );
 325
 326                 $text = $this->mStripState->unstripNoWiki( $text );
 327
 328                 wfRunHooks( 'ParserBeforeTidy', array( &$this, &$text ) );
 329
 330                 $text = Sanitizer::normalizeCharReferences( $text );
 331
 332                 if (($wgUseTidy and $this->mOptions->mTidy) or $wgAlwaysUseTidy) {
 333                         $text = Parser::tidy($text);
 334                 } else {
 335                         # attempt to sanitize at least some nesting problems
 336                         # (bug #2702 and quite a few others)
 337                         $tidyregs = array(
 338                                 # ''Something [http://www.cool.com cool''] -->
 339                                 # <i>Something</i><a href="http://www.cool.com"..><i>cool></i></a>
 340                                 '/(<([bi])>)(<([bi])>)?([^<]*)(<\/?a[^<]*>)([^<]*)(<\/\\4>)?(<\/\\2>)/' =>
 341                                 '\\1\\3\\5\\8\\9\\6\\1\\3\\7\\8\\9',
 342                                 # fix up an anchor inside another anchor, only
 343                                 # at least for a single single nested link (bug 3695)
 344                                 '/(<a[^>]+>)([^<]*)(<a[^>]+>[^<]*)<\/a>(.*)<\/a>/' =>
 345                                 '\\1\\2</a>\\3</a>\\1\\4</a>',
 346                                 # fix div inside inline elements- doBlockLevels won't wrap a line which
 347                                 # contains a div, so fix it up here; replace
 348                                 # div with escaped text
 349                                 '/(<([aib]) [^>]+>)([^<]*)(<div([^>]*)>)(.*)(<\/div>)([^<]*)(<\/\\2>)/' =>
 350                                 '\\1\\3&lt;div\\5&gt;\\6&lt;/div&gt;\\8\\9',
 351                                 # remove empty italic or bold tag pairs, some
 352                                 # introduced by rules above
 353                                 '/<([bi])><\/\\1>/' => '',
 354                         );
 355
 356                         $text = preg_replace(
 357                                 array_keys( $tidyregs ),
 358                                 array_values( $tidyregs ),
 359                                 $text );
 360                 }
 361
 362                 wfRunHooks( 'ParserAfterTidy', array( &$this, &$text ) );
 363
 364                 # Information on include size limits, for the benefit of users who try to skirt them
 365                 if ( max( $this->mIncludeSizes ) > 1000 ) {
 366                         $max = $this->mOptions->getMaxIncludeSize();
 367                         $text .= "<!-- \n" .
 368                                 "Pre-expand include size: {$this->mIncludeSizes['pre-expand']} bytes\n" .
 369                                 "Post-expand include size: {$this->mIncludeSizes['post-expand']} bytes\n" .
 370                                 "Template argument size: {$this->mIncludeSizes['arg']} bytes\n" .
 371                                 "Maximum: $max bytes\n" .
 372                                 "-->\n";
 373                 }
 374                 $this->mOutput->setText( $text );
 375                 $this->mRevisionId = $oldRevisionId;
 376                 $this->mRevisionTimestamp = $oldRevisionTimestamp;
 377                 wfProfileOut( $fname );
 378                 wfProfileOut( __METHOD__ );
 379
 380                 return $this->mOutput;
 381         }
 382
 383         /**
 384          * Recursive parser entry point that can be called from an extension tag
 385          * hook.
 386          */
 387         function recursiveTagParse( $text ) {
 388                 wfProfileIn( __METHOD__ );
 389                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 390                 $text = $this->strip( $text, $this->mStripState );
 391                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 392                 $text = $this->internalParse( $text );
 393                 wfProfileOut( __METHOD__ );
 394                 return $text;
 395         }
 396
 397         /**
 398          * Expand templates and variables in the text, producing valid, static wikitext.
 399          * Also removes comments.
 400          */
 401         function preprocess( $text, $title, $options ) {
 402                 wfProfileIn( __METHOD__ );
 403                 $this->clearState();
 404                 $this->setOutputType( OT_PREPROCESS );
 405                 $this->mOptions = $options;
 406                 $this->mTitle = $title;
 407                 wfRunHooks( 'ParserBeforeStrip', array( &$this, &$text, &$this->mStripState ) );
 408                 $text = $this->strip( $text, $this->mStripState );
 409                 wfRunHooks( 'ParserAfterStrip', array( &$this, &$text, &$this->mStripState ) );
 410                 if ( $this->mOptions->getRemoveComments() ) {
 411                         $text = Sanitizer::removeHTMLcomments( $text );
 412                 }
 413                 $text = $this->replaceVariables( $text );
 414                 $text = $this->mStripState->unstripBoth( $text );
 415                 wfProfileOut( __METHOD__ );
 416                 return $text;
 417         }
 418
 419         /**
 420          * Get a random string
 421          *
 422          * @private
 423          * @static
 424          */
 425         function getRandomString() {
 426                 return dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
 427         }
 428
 429         function &getTitle() { return $this->mTitle; }
 430         function getOptions() { return $this->mOptions; }
 431
 432         function getFunctionLang() {
 433                 global $wgLang, $wgContLang;
 434                 return $this->mOptions->getInterfaceMessage() ? $wgLang : $wgContLang;
 435         }
 436
 437         /**
 438          * Replaces all occurrences of HTML-style comments and the given tags
 439          * in the text with a random marker and returns teh next text. The output
 440          * parameter $matches will be an associative array filled with data in
 441          * the form:
 442          *   'UNIQ-xxxxx' => array(
 443          *     'element',
 444          *     'tag content',
 445          *     array( 'param' => 'x' ),
 446          *     '<element param="x">tag content</element>' ) )
 447          *
 448          * @param $elements list of element names. Comments are always extracted.
 449          * @param $text Source text string.
 450          * @param $uniq_prefix
 451          *
 452          * @private
 453          * @static
 454          */
 455         function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
 456                 static $n = 1;
 457                 $stripped = '';
 458                 $matches = array();
 459
 460                 $taglist = implode( '|', $elements );
 461                 $start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
 462
 463                 while ( '' != $text ) {
 464                         $p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
 465                         $stripped .= $p[0];
 466                         if( count( $p ) < 5 ) {
 467                                 break;
 468                         }
 469                         if( count( $p ) > 5 ) {
 470                                 // comment
 471                                 $element    = $p[4];
 472                                 $attributes = '';
 473                                 $close      = '';
 474                                 $inside     = $p[5];
 475                         } else {
 476                                 // tag
 477                                 $element    = $p[1];
 478                                 $attributes = $p[2];
 479                                 $close      = $p[3];
 480                                 $inside     = $p[4];
 481                         }
 482
 483                         $marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . '-QINU';
 484                         $stripped .= $marker;
 485
 486                         if ( $close === '/>' ) {
 487                                 // Empty element tag, <tag />
 488                                 $content = null;
 489                                 $text = $inside;
 490                                 $tail = null;
 491                         } else {
 492                                 if( $element == '!--' ) {
 493                                         $end = '/(-->)/';
 494                                 } else {
 495                                         $end = "/(<\\/$element\\s*>)/i";
 496                                 }
 497                                 $q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
 498                                 $content = $q[0];
 499                                 if( count( $q ) < 3 ) {
 500                                         # No end tag -- let it run out to the end of the text.
 501                                         $tail = '';
 502                                         $text = '';
 503                                 } else {
 504                                         $tail = $q[1];
 505                                         $text = $q[2];
 506                                 }
 507                         }
 508
 509                         $matches[$marker] = array( $element,
 510                                 $content,
 511                                 Sanitizer::decodeTagAttributes( $attributes ),
 512                                 "<$element$attributes$close$content$tail" );
 513                 }
 514                 return $stripped;
 515         }
 516
 517         /**
 518          * Strips and renders nowiki, pre, math, hiero
 519          * If $render is set, performs necessary rendering operations on plugins
 520          * Returns the text, and fills an array with data needed in unstrip()
 521          *
 522          * @param StripState $state
 523          *
 524          * @param bool $stripcomments when set, HTML comments <!-- like this -->
 525          *  will be stripped in addition to other tags. This is important
 526          *  for section editing, where these comments cause confusion when
 527          *  counting the sections in the wikisource
 528          *
 529          * @param array dontstrip contains tags which should not be stripped;
 530          *  used to prevent stipping of <gallery> when saving (fixes bug 2700)
 531          *
 532          * @private
 533          */
 534         function strip( $text, $state, $stripcomments = false , $dontstrip = array () ) {
 535                 global $wgContLang;
 536                 wfProfileIn( __METHOD__ );
 537                 $render = ($this->mOutputType == OT_HTML);
 538
 539                 $uniq_prefix = $this->mUniqPrefix;
 540                 $commentState = new ReplacementArray;
 541                 $nowikiItems = array();
 542                 $generalItems = array();
 543
 544                 $elements = array_merge(
 545                         array( 'nowiki', 'gallery' ),
 546                         array_keys( $this->mTagHooks ) );
 547                 global $wgRawHtml;
 548                 if( $wgRawHtml ) {
 549                         $elements[] = 'html';
 550                 }
 551                 if( $this->mOptions->getUseTeX() ) {
 552                         $elements[] = 'math';
 553                 }
 554
 555                 # Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
 556                 foreach ( $elements AS $k => $v ) {
 557                         if ( !in_array ( $v , $dontstrip ) ) continue;
 558                         unset ( $elements[$k] );
 559                 }
 560
 561                 $matches = array();
 562                 $text = Parser::extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
 563
 564                 foreach( $matches as $marker => $data ) {
 565                         list( $element, $content, $params, $tag ) = $data;
 566                         if( $render ) {
 567                                 $tagName = strtolower( $element );
 568                                 wfProfileIn( __METHOD__."-render-$tagName" );
 569                                 switch( $tagName ) {
 570                                 case '!--':
 571                                         // Comment
 572                                         if( substr( $tag, -3 ) == '-->' ) {
 573                                                 $output = $tag;
 574                                         } else {
 575                                                 // Unclosed comment in input.
 576                                                 // Close it so later stripping can remove it
 577                                                 $output = "$tag-->";
 578                                         }
 579                                         break;
 580                                 case 'html':
 581                                         if( $wgRawHtml ) {
 582                                                 $output = $content;
 583                                                 break;
 584                                         }
 585                                         // Shouldn't happen otherwise. :)
 586                                 case 'nowiki':
 587                                         $output = Xml::escapeTagsOnly( $content );
 588                                         break;
 589                                 case 'math':
 590                                         $output = $wgContLang->armourMath( MathRenderer::renderMath( $content ) );
 591                                         break;
 592                                 case 'gallery':
 593                                         $output = $this->renderImageGallery( $content, $params );
 594                                         break;
 595                                 default:
 596                                         if( isset( $this->mTagHooks[$tagName] ) ) {
 597                                                 $output = call_user_func_array( $this->mTagHooks[$tagName],
 598                                                         array( $content, $params, $this ) );
 599                                         } else {
 600                                                 throw new MWException( "Invalid call hook $element" );
 601                                         }
 602                                 }
 603                                 wfProfileOut( __METHOD__."-render-$tagName" );
 604                         } else {
 605                                 // Just stripping tags; keep the source
 606                                 $output = $tag;
 607                         }
 608
 609                         // Unstrip the output, to support recursive strip() calls
 610                         $output = $state->unstripBoth( $output );
 611
 612                         if( !$stripcomments && $element == '!--' ) {
 613                                 $commentState->setPair( $marker, $output );
 614                         } elseif ( $element == 'html' || $element == 'nowiki' ) {
 615                                 $nowikiItems[$marker] = $output;
 616                         } else {
 617                                 $generalItems[$marker] = $output;
 618                         }
 619                 }
 620                 # Add the new items to the state
 621                 # We do this after the loop instead of during it to avoid slowing
 622                 # down the recursive unstrip
 623                 $state->nowiki->mergeArray( $nowikiItems );
 624                 $state->general->mergeArray( $generalItems );
 625
 626                 # Unstrip comments unless explicitly told otherwise.
 627                 # (The comments are always stripped prior to this point, so as to
 628                 # not invoke any extension tags / parser hooks contained within
 629                 # a comment.)
 630                 if ( !$stripcomments ) {
 631                         // Put them all back and forget them
 632                         $text = $commentState->replace( $text );
 633                 }
 634
 635                 wfProfileOut( __METHOD__ );
 636                 return $text;
 637         }
 638
 639         /**
 640          * Restores pre, math, and other extensions removed by strip()
 641          *
 642          * always call unstripNoWiki() after this one
 643          * @private
 644          * @deprecated use $this->mStripState->unstrip()
 645          */
 646         function unstrip( $text, $state ) {
 647                 return $state->unstripGeneral( $text );
 648         }
 649
 650         /**
 651          * Always call this after unstrip() to preserve the order
 652          *
 653          * @private
 654          * @deprecated use $this->mStripState->unstrip()
 655          */
 656         function unstripNoWiki( $text, $state ) {
 657                 return $state->unstripNoWiki( $text );
 658         }
 659
 660         /**
 661          * @deprecated use $this->mStripState->unstripBoth()
 662          */
 663         function unstripForHTML( $text ) {
 664                 return $this->mStripState->unstripBoth( $text );
 665         }
 666
 667         /**
 668          * Add an item to the strip state
 669          * Returns the unique tag which must be inserted into the stripped text
 670          * The tag will be replaced with the original text in unstrip()
 671          *
 672          * @private
 673          */
 674         function insertStripItem( $text, &$state ) {
 675                 $rnd = $this->mUniqPrefix . '-item' . Parser::getRandomString();
 676                 $state->general->setPair( $rnd, $text );
 677                 return $rnd;
 678         }
 679
 680         /**
 681          * Interface with html tidy, used if $wgUseTidy = true.
 682          * If tidy isn't able to correct the markup, the original will be
 683          * returned in all its glory with a warning comment appended.
 684          *
 685          * Either the external tidy program or the in-process tidy extension
 686          * will be used depending on availability. Override the default
 687          * $wgTidyInternal setting to disable the internal if it's not working.
 688          *
 689          * @param string $text Hideous HTML input
 690          * @return string Corrected HTML output
 691          * @public
 692          * @static
 693          */
 694         function tidy( $text ) {
 695                 global $wgTidyInternal;
 696                 $wrappedtext = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'.
 697 ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>'.
 698 '<head><title>test</title></head><body>'.$text.'</body></html>';
 699                 if( $wgTidyInternal ) {
 700                         $correctedtext = Parser::internalTidy( $wrappedtext );
 701                 } else {
 702                         $correctedtext = Parser::externalTidy( $wrappedtext );
 703                 }
 704                 if( is_null( $correctedtext ) ) {
 705                         wfDebug( "Tidy error detected!\n" );
 706                         return $text . "\n<!-- Tidy found serious XHTML errors -->\n";
 707                 }
 708                 return $correctedtext;
 709         }
 710
 711         /**
 712          * Spawn an external HTML tidy process and get corrected markup back from it.
 713          *
 714          * @private
 715          * @static
 716          */
 717         function externalTidy( $text ) {
 718                 global $wgTidyConf, $wgTidyBin, $wgTidyOpts;
 719                 $fname = 'Parser::externalTidy';
 720                 wfProfileIn( $fname );
 721
 722                 $cleansource = '';
 723                 $opts = ' -utf8';
 724
 725                 $descriptorspec = array(
 726                         0 => array('pipe', 'r'),
 727                         1 => array('pipe', 'w'),
 728                         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.
 729                 );
 730                 $pipes = array();
 731                 $process = proc_open("$wgTidyBin -config $wgTidyConf $wgTidyOpts$opts", $descriptorspec, $pipes);
 732                 if (is_resource($process)) {
 733                         // Theoretically, this style of communication could cause a deadlock
 734                         // here. If the stdout buffer fills up, then writes to stdin could
 735                         // block. This doesn't appear to happen with tidy, because tidy only
 736                         // writes to stdout after it's finished reading from stdin. Search
 737                         // for tidyParseStdin and tidySaveStdout in console/tidy.c
 738                         fwrite($pipes[0], $text);
 739                         fclose($pipes[0]);
 740                         while (!feof($pipes[1])) {
 741                                 $cleansource .= fgets($pipes[1], 1024);
 742                         }
 743                         fclose($pipes[1]);
 744                         proc_close($process);
 745                 }
 746
 747                 wfProfileOut( $fname );
 748
 749                 if( $cleansource == '' && $text != '') {
 750                         // Some kind of error happened, so we couldn't get the corrected text.
 751                         // Just give up; we'll use the source text and append a warning.
 752                         return null;
 753                 } else {
 754                         return $cleansource;
 755                 }
 756         }
 757
 758         /**
 759          * Use the HTML tidy PECL extension to use the tidy library in-process,
 760          * saving the overhead of spawning a new process. Currently written to
 761          * the PHP 4.3.x version of the extension, may not work on PHP 5.
 762          *
 763          * 'pear install tidy' should be able to compile the extension module.
 764          *
 765          * @private
 766          * @static
 767          */
 768         function internalTidy( $text ) {
 769                 global $wgTidyConf;
 770                 $fname = 'Parser::internalTidy';
 771                 wfProfileIn( $fname );
 772
 773                 tidy_load_config( $wgTidyConf );
 774                 tidy_set_encoding( 'utf8' );
 775                 tidy_parse_string( $text );
 776                 tidy_clean_repair();
 777                 if( tidy_get_status() == 2 ) {
 778                         // 2 is magic number for fatal error
 779                         // http://www.php.net/manual/en/function.tidy-get-status.php
 780                         $cleansource = null;
 781                 } else {
 782                         $cleansource = tidy_get_output();
 783                 }
 784                 wfProfileOut( $fname );
 785                 return $cleansource;
 786         }
 787
 788         /**
 789          * parse the wiki syntax used to render tables
 790          *
 791          * @private
 792          */
 793         function doTableStuff ( $text ) {
 794                 $fname = 'Parser::doTableStuff';
 795                 wfProfileIn( $fname );
 796
 797                 $lines = explode ( "\n" , $text );
 798                 $td_history = array (); // Is currently a td tag open?
 799                 $last_tag_history = array (); // Save history of last lag activated (td, th or caption)
 800                 $tr_history = array (); // Is currently a tr tag open?
 801                 $tr_attributes = array (); // history of tr attributes
 802                 $has_opened_tr = array(); // Did this table open a <tr> element?
 803                 $indent_level = 0; // indent level of the table
 804                 foreach ( $lines as $key => $line )
 805                 {
 806                         $line = trim ( $line );
 807
 808                         if( $line == '' ) { // empty line, go to next line
 809                                 continue;
 810                         }
 811                         $first_character = $line{0};
 812                         $matches = array();
 813
 814                         if ( preg_match( '/^(:*)\{\|(.*)$/' , $line , $matches ) ) {
 815                                 // First check if we are starting a new table
 816                                 $indent_level = strlen( $matches[1] );
 817
 818                                 $attributes = $this->mStripState->unstripBoth( $matches[2] );
 819                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'table' );
 820
 821                                 $lines[$key] = str_repeat( '<dl><dd>' , $indent_level ) . "<table{$attributes}>";
 822                                 array_push ( $td_history , false );
 823                                 array_push ( $last_tag_history , '' );
 824                                 array_push ( $tr_history , false );
 825                                 array_push ( $tr_attributes , '' );
 826                                 array_push ( $has_opened_tr , false );
 827                         } else if ( count ( $td_history ) == 0 ) {
 828                                 // Don't do any of the following
 829                                 continue;
 830                         } else if ( substr ( $line , 0 , 2 ) == '|}' ) {
 831                                 // We are ending a table
 832                                 $line = '</table>' . substr ( $line , 2 );
 833                                 $last_tag = array_pop ( $last_tag_history );
 834
 835                                 if ( !array_pop ( $has_opened_tr ) ) {
 836                                         $line = "<tr><td></td></tr>{$line}";
 837                                 }
 838
 839                                 if ( array_pop ( $tr_history ) ) {
 840                                         $line = "</tr>{$line}";
 841                                 }
 842
 843                                 if ( array_pop ( $td_history ) ) {
 844                                         $line = "</{$last_tag}>{$line}";
 845                                 }
 846                                 array_pop ( $tr_attributes );
 847                                 $lines[$key] = $line . str_repeat( '</dd></dl>' , $indent_level );
 848                         } else if ( substr ( $line , 0 , 2 ) == '|-' ) {
 849                                 // Now we have a table row
 850                                 $line = preg_replace( '#^\|-+#', '', $line );
 851
 852                                 // Whats after the tag is now only attributes
 853                                 $attributes = $this->mStripState->unstripBoth( $line );
 854                                 $attributes = Sanitizer::fixTagAttributes ( $attributes , 'tr' );
 855                                 array_pop ( $tr_attributes );
 856                                 array_push ( $tr_attributes , $attributes );
 857
 858                                 $line = '';
 859                                 $last_tag = array_pop ( $last_tag_history );
 860                                 array_pop ( $has_opened_tr );
 861                                 array_push ( $has_opened_tr , true );
 862
 863                                 if ( array_pop ( $tr_history ) ) {
 864                                         $line = '</tr>';
 865                                 }
 866
 867                                 if ( array_pop ( $td_history ) ) {
 868                                         $line = "</{$last_tag}>{$line}";
 869                                 }
 870
 871                                 $lines[$key] = $line;
 872                                 array_push ( $tr_history , false );
 873                                 array_push ( $td_history , false );
 874                                 array_push ( $last_tag_history , '' );
 875                         }
 876                         else if ( $first_character == '|' || $first_character == '!' || substr ( $line , 0 , 2 )  == '|+' ) {
 877                                 // This might be cell elements, td, th or captions
 878                                 if ( substr ( $line , 0 , 2 ) == '|+' ) {
 879                                         $first_character = '+';
 880                                         $line = substr ( $line , 1 );
 881                                 }
 882
 883                                 $line = substr ( $line , 1 );
 884
 885                                 if ( $first_character == '!' ) {
 886                                         $line = str_replace ( '!!' , '||' , $line );
 887                                 }
 888
 889                                 // Split up multiple cells on the same line.
 890                                 // FIXME : This can result in improper nesting of tags processed
 891                                 // by earlier parser steps, but should avoid splitting up eg
 892                                 // attribute values containing literal "||".
 893                                 $cells = StringUtils::explodeMarkup( '||' , $line );
 894
 895                                 $lines[$key] = '';
 896
 897                                 // Loop through each table cell
 898                                 foreach ( $cells as $cell )
 899                                 {
 900                                         $previous = '';
 901                                         if ( $first_character != '+' )
 902                                         {
 903                                                 $tr_after = array_pop ( $tr_attributes );
 904                                                 if ( !array_pop ( $tr_history ) ) {
 905                                                         $previous = "<tr{$tr_after}>\n";
 906                                                 }
 907                                                 array_push ( $tr_history , true );
 908                                                 array_push ( $tr_attributes , '' );
 909                                                 array_pop ( $has_opened_tr );
 910                                                 array_push ( $has_opened_tr , true );
 911                                         }
 912
 913                                         $last_tag = array_pop ( $last_tag_history );
 914
 915                                         if ( array_pop ( $td_history ) ) {
 916                                                 $previous = "</{$last_tag}>{$previous}";
 917                                         }
 918
 919                                         if ( $first_character == '|' ) {
 920                                                 $last_tag = 'td';
 921                                         } else if ( $first_character == '!' ) {
 922                                                 $last_tag = 'th';
 923                                         } else if ( $first_character == '+' ) {
 924                                                 $last_tag = 'caption';
 925                                         } else {
 926                                                 $last_tag = '';
 927                                         }
 928
 929                                         array_push ( $last_tag_history , $last_tag );
 930
 931                                         // A cell could contain both parameters and data
 932                                         $cell_data = explode ( '|' , $cell , 2 );
 933
 934                                         // Bug 553: Note that a '|' inside an invalid link should not
 935                                         // be mistaken as delimiting cell parameters
 936                                         if ( strpos( $cell_data[0], '[[' ) !== false ) {
 937                                                 $cell = "{$previous}<{$last_tag}>{$cell}";
 938                                         } else if ( count ( $cell_data ) == 1 )
 939                                                 $cell = "{$previous}<{$last_tag}>{$cell_data[0]}";
 940                                         else {
 941                                                 $attributes = $this->mStripState->unstripBoth( $cell_data[0] );
 942                                                 $attributes = Sanitizer::fixTagAttributes( $attributes , $last_tag );
 943                                                 $cell = "{$previous}<{$last_tag}{$attributes}>{$cell_data[1]}";
 944                                         }
 945
 946                                         $lines[$key] .= $cell;
 947                                         array_push ( $td_history , true );
 948                                 }
 949                         }
 950                 }
 951
 952                 // Closing open td, tr && table
 953                 while ( count ( $td_history ) > 0 )
 954                 {
 955                         if ( array_pop ( $td_history ) ) {
 956                                 $lines[] = '</td>' ;
 957                         }
 958                         if ( array_pop ( $tr_history ) ) {
 959                                 $lines[] = '</tr>' ;
 960                         }
 961                         if ( !array_pop ( $has_opened_tr ) ) {
 962                                 $lines[] = "<tr><td></td></tr>" ;
 963                         }
 964
 965                         $lines[] = '</table>' ;
 966                 }
 967
 968                 $output = implode ( "\n" , $lines ) ;
 969
 970                 // special case: don't return empty table
 971                 if( $output == "<table>\n<tr><td></td></tr>\n</table>" ) {
 972                         $output = '';
 973                 }
 974
 975                 wfProfileOut( $fname );
 976
 977                 return $output;
 978         }
 979
 980         /**
 981          * Helper function for parse() that transforms wiki markup into
 982          * HTML. Only called for $mOutputType == OT_HTML.
 983          *
 984          * @private
 985          */
 986         function internalParse( $text ) {
 987                 $args = array();
 988                 $isMain = true;
 989                 $fname = 'Parser::internalParse';
 990                 wfProfileIn( $fname );
 991
 992                 # Hook to suspend the parser in this state
 993                 if ( !wfRunHooks( 'ParserBeforeInternalParse', array( &$this, &$text, &$this->mStripState ) ) ) {
 994                         wfProfileOut( $fname );
 995                         return $text ;
 996                 }
 997
 998                 # Remove <noinclude> tags and <includeonly> sections
 999                 $text = strtr( $text, array( '<onlyinclude>' => '' , '</onlyinclude>' => '' ) );
1000                 $text = strtr( $text, array( '<noinclude>' => '', '</noinclude>' => '') );
1001                 $text = StringUtils::delimiterReplace( '<includeonly>', '</includeonly>', '', $text );
1002
1003                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'attributeStripCallback' ) );
1004
1005                 $text = $this->replaceVariables( $text, $args );
1006                 wfRunHooks( 'InternalParseBeforeLinks', array( &$this, &$text, &$this->mStripState ) );
1007
1008                 // Tables need to come after variable replacement for things to work
1009                 // properly; putting them before other transformations should keep
1010                 // exciting things like link expansions from showing up in surprising
1011                 // places.
1012                 $text = $this->doTableStuff( $text );
1013
1014                 $text = preg_replace( '/(^|\n)-----*/', '\\1<hr />', $text );
1015
1016                 $text = $this->stripToc( $text );
1017                 $this->stripNoGallery( $text );
1018                 $text = $this->doHeadings( $text );
1019                 if($this->mOptions->getUseDynamicDates()) {
1020                         $df =& DateFormatter::getInstance();
1021                         $text = $df->reformat( $this->mOptions->getDateFormat(), $text );
1022                 }
1023                 $text = $this->doAllQuotes( $text );
1024                 $text = $this->replaceInternalLinks( $text );
1025                 $text = $this->replaceExternalLinks( $text );
1026
1027                 # replaceInternalLinks may sometimes leave behind
1028                 # absolute URLs, which have to be masked to hide them from replaceExternalLinks
1029                 $text = str_replace($this->mUniqPrefix."NOPARSE", "", $text);
1030
1031                 $text = $this->doMagicLinks( $text );
1032                 $text = $this->formatHeadings( $text, $isMain );
1033
1034                 wfProfileOut( $fname );
1035                 return $text;
1036         }
1037
1038         /**
1039          * Replace special strings like "ISBN xxx" and "RFC xxx" with
1040          * magic external links.
1041          *
1042          * @private
1043          */
1044         function &doMagicLinks( &$text ) {
1045                 wfProfileIn( __METHOD__ );
1046                 $text = preg_replace_callback(
1047                         '!(?:                           # Start cases
1048                             <a.*?</a> |                 # Skip link text
1049                             <.*?> |                     # Skip stuff inside HTML elements
1050                             (?:RFC|PMID)\s+([0-9]+) |   # RFC or PMID, capture number as m[1]
1051                             ISBN\s+(\b                  # ISBN, capture number as m[2]
1052                                      (?: 97[89] [\ \-]? )?   # optional 13-digit ISBN prefix
1053                                      (?: [0-9]  [\ \-]? ){9} # 9 digits with opt. delimiters
1054                                      [0-9Xx]                 # check digit
1055                                    \b)
1056                         )!x', array( &$this, 'magicLinkCallback' ), $text );
1057                 wfProfileOut( __METHOD__ );
1058                 return $text;
1059         }
1060
1061         function magicLinkCallback( $m ) {
1062                 if ( substr( $m[0], 0, 1 ) == '<' ) {
1063                         # Skip HTML element
1064                         return $m[0];
1065                 } elseif ( substr( $m[0], 0, 4 ) == 'ISBN' ) {
1066                         $isbn = $m[2];
1067                         $num = strtr( $isbn, array(
1068                                 '-' => '',
1069                                 ' ' => '',
1070                                 'x' => 'X',
1071                         ));
1072                         $titleObj = SpecialPage::getTitleFor( 'Booksources' );
1073                         $text = '<a href="' .
1074                                 $titleObj->escapeLocalUrl( "isbn=$num" ) .
1075                                 "\" class=\"internal\">ISBN $isbn</a>";
1076                 } else {
1077                         if ( substr( $m[0], 0, 3 ) == 'RFC' ) {
1078                                 $keyword = 'RFC';
1079                                 $urlmsg = 'rfcurl';
1080                                 $id = $m[1];
1081                         } elseif ( substr( $m[0], 0, 4 ) == 'PMID' ) {
1082                                 $keyword = 'PMID';
1083                                 $urlmsg = 'pubmedurl';
1084                                 $id = $m[1];
1085                         } else {
1086                                 throw new MWException( __METHOD__.': unrecognised match type "' .
1087                                         substr($m[0], 0, 20 ) . '"' );
1088                         }
1089
1090                         $url = wfMsg( $urlmsg, $id);
1091                         $sk = $this->mOptions->getSkin();
1092                         $la = $sk->getExternalLinkAttributes( $url, $keyword.$id );
1093                         $text = "<a href=\"{$url}\"{$la}>{$keyword} {$id}</a>";
1094                 }
1095                 return $text;
1096         }
1097
1098         /**
1099          * Parse headers and return html
1100          *
1101          * @private
1102          */
1103         function doHeadings( $text ) {
1104                 $fname = 'Parser::doHeadings';
1105                 wfProfileIn( $fname );
1106                 for ( $i = 6; $i >= 1; --$i ) {
1107                         $h = str_repeat( '=', $i );
1108                         $text = preg_replace( "/^{$h}(.+){$h}\\s*$/m",
1109                           "<h{$i}>\\1</h{$i}>\\2", $text );
1110                 }
1111                 wfProfileOut( $fname );
1112                 return $text;
1113         }
1114
1115         /**
1116          * Replace single quotes with HTML markup
1117          * @private
1118          * @return string the altered text
1119          */
1120         function doAllQuotes( $text ) {
1121                 $fname = 'Parser::doAllQuotes';
1122                 wfProfileIn( $fname );
1123                 $outtext = '';
1124                 $lines = explode( "\n", $text );
1125                 foreach ( $lines as $line ) {
1126                         $outtext .= $this->doQuotes ( $line ) . "\n";
1127                 }
1128                 $outtext = substr($outtext, 0,-1);
1129                 wfProfileOut( $fname );
1130                 return $outtext;
1131         }
1132
1133         /**
1134          * Helper function for doAllQuotes()
1135          * @private
1136          */
1137         function doQuotes( $text ) {
1138                 $arr = preg_split( "/(''+)/", $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1139                 if ( count( $arr ) == 1 )
1140                         return $text;
1141                 else
1142                 {
1143                         # First, do some preliminary work. This may shift some apostrophes from
1144                         # being mark-up to being text. It also counts the number of occurrences
1145                         # of bold and italics mark-ups.
1146                         $i = 0;
1147                         $numbold = 0;
1148                         $numitalics = 0;
1149                         foreach ( $arr as $r )
1150                         {
1151                                 if ( ( $i % 2 ) == 1 )
1152                                 {
1153                                         # If there are ever four apostrophes, assume the first is supposed to
1154                                         # be text, and the remaining three constitute mark-up for bold text.
1155                                         if ( strlen( $arr[$i] ) == 4 )
1156                                         {
1157                                                 $arr[$i-1] .= "'";
1158                                                 $arr[$i] = "'''";
1159                                         }
1160                                         # If there are more than 5 apostrophes in a row, assume they're all
1161                                         # text except for the last 5.
1162                                         else if ( strlen( $arr[$i] ) > 5 )
1163                                         {
1164                                                 $arr[$i-1] .= str_repeat( "'", strlen( $arr[$i] ) - 5 );
1165                                                 $arr[$i] = "'''''";
1166                                         }
1167                                         # Count the number of occurrences of bold and italics mark-ups.
1168                                         # We are not counting sequences of five apostrophes.
1169                                         if ( strlen( $arr[$i] ) == 2 )      { $numitalics++;             }
1170                                         else if ( strlen( $arr[$i] ) == 3 ) { $numbold++;                }
1171                                         else if ( strlen( $arr[$i] ) == 5 ) { $numitalics++; $numbold++; }
1172                                 }
1173                                 $i++;
1174                         }
1175
1176                         # If there is an odd number of both bold and italics, it is likely
1177                         # that one of the bold ones was meant to be an apostrophe followed
1178                         # by italics. Which one we cannot know for certain, but it is more
1179                         # likely to be one that has a single-letter word before it.
1180                         if ( ( $numbold % 2 == 1 ) && ( $numitalics % 2 == 1 ) )
1181                         {
1182                                 $i = 0;
1183                                 $firstsingleletterword = -1;
1184                                 $firstmultiletterword = -1;
1185                                 $firstspace = -1;
1186                                 foreach ( $arr as $r )
1187                                 {
1188                                         if ( ( $i % 2 == 1 ) and ( strlen( $r ) == 3 ) )
1189                                         {
1190                                                 $x1 = substr ($arr[$i-1], -1);
1191                                                 $x2 = substr ($arr[$i-1], -2, 1);
1192                                                 if ($x1 == ' ') {
1193                                                         if ($firstspace == -1) $firstspace = $i;
1194                                                 } else if ($x2 == ' ') {
1195                                                         if ($firstsingleletterword == -1) $firstsingleletterword = $i;
1196                                                 } else {
1197                                                         if ($firstmultiletterword == -1) $firstmultiletterword = $i;
1198                                                 }
1199                                         }
1200                                         $i++;
1201                                 }
1202
1203                                 # If there is a single-letter word, use it!
1204                                 if ($firstsingleletterword > -1)
1205                                 {
1206                                         $arr [ $firstsingleletterword ] = "''";
1207                                         $arr [ $firstsingleletterword-1 ] .= "'";
1208                                 }
1209                                 # If not, but there's a multi-letter word, use that one.
1210                                 else if ($firstmultiletterword > -1)
1211                                 {
1212                                         $arr [ $firstmultiletterword ] = "''";
1213                                         $arr [ $firstmultiletterword-1 ] .= "'";
1214                                 }
1215                                 # ... otherwise use the first one that has neither.
1216                                 # (notice that it is possible for all three to be -1 if, for example,
1217                                 # there is only one pentuple-apostrophe in the line)
1218                                 else if ($firstspace > -1)
1219                                 {
1220                                         $arr [ $firstspace ] = "''";
1221                                         $arr [ $firstspace-1 ] .= "'";
1222                                 }
1223                         }
1224
1225                         # Now let's actually convert our apostrophic mush to HTML!
1226                         $output = '';
1227                         $buffer = '';
1228                         $state = '';
1229                         $i = 0;
1230                         foreach ($arr as $r)
1231                         {
1232                                 if (($i % 2) == 0)
1233                                 {
1234                                         if ($state == 'both')
1235                                                 $buffer .= $r;
1236                                         else
1237                                                 $output .= $r;
1238                                 }
1239                                 else
1240                                 {
1241                                         if (strlen ($r) == 2)
1242                                         {
1243                                                 if ($state == 'i')
1244                                                 { $output .= '</i>'; $state = ''; }
1245                                                 else if ($state == 'bi')
1246                                                 { $output .= '</i>'; $state = 'b'; }
1247                                                 else if ($state == 'ib')
1248                                                 { $output .= '</b></i><b>'; $state = 'b'; }
1249                                                 else if ($state == 'both')
1250                                                 { $output .= '<b><i>'.$buffer.'</i>'; $state = 'b'; }
1251                                                 else # $state can be 'b' or ''
1252                                                 { $output .= '<i>'; $state .= 'i'; }
1253                                         }
1254                                         else if (strlen ($r) == 3)
1255                                         {
1256                                                 if ($state == 'b')
1257                                                 { $output .= '</b>'; $state = ''; }
1258                                                 else if ($state == 'bi')
1259                                                 { $output .= '</i></b><i>'; $state = 'i'; }
1260                                                 else if ($state == 'ib')
1261                                                 { $output .= '</b>'; $state = 'i'; }
1262                                                 else if ($state == 'both')
1263                                                 { $output .= '<i><b>'.$buffer.'</b>'; $state = 'i'; }
1264                                                 else # $state can be 'i' or ''
1265                                                 { $output .= '<b>'; $state .= 'b'; }
1266                                         }
1267                                         else if (strlen ($r) == 5)
1268                                         {
1269                                                 if ($state == 'b')
1270                                                 { $output .= '</b><i>'; $state = 'i'; }
1271                                                 else if ($state == 'i')
1272                                                 { $output .= '</i><b>'; $state = 'b'; }
1273                                                 else if ($state == 'bi')
1274                                                 { $output .= '</i></b>'; $state = ''; }
1275                                                 else if ($state == 'ib')
1276                                                 { $output .= '</b></i>'; $state = ''; }
1277                                                 else if ($state == 'both')
1278                                                 { $output .= '<i><b>'.$buffer.'</b></i>'; $state = ''; }
1279                                                 else # ($state == '')
1280                                                 { $buffer = ''; $state = 'both'; }
1281                                         }
1282                                 }
1283                                 $i++;
1284                         }
1285                         # Now close all remaining tags.  Notice that the order is important.
1286                         if ($state == 'b' || $state == 'ib')
1287                                 $output .= '</b>';
1288                         if ($state == 'i' || $state == 'bi' || $state == 'ib')
1289                                 $output .= '</i>';
1290                         if ($state == 'bi')
1291                                 $output .= '</b>';
1292                         # There might be lonely ''''', so make sure we have a buffer
1293                         if ($state == 'both' && $buffer)
1294                                 $output .= '<b><i>'.$buffer.'</i></b>';
1295                         return $output;
1296                 }
1297         }
1298
1299         /**
1300          * Replace external links
1301          *
1302          * Note: this is all very hackish and the order of execution matters a lot.
1303          * Make sure to run maintenance/parserTests.php if you change this code.
1304          *
1305          * @private
1306          */
1307         function replaceExternalLinks( $text ) {
1308                 global $wgContLang;
1309                 $fname = 'Parser::replaceExternalLinks';
1310                 wfProfileIn( $fname );
1311
1312                 $sk = $this->mOptions->getSkin();
1313
1314                 $bits = preg_split( EXT_LINK_BRACKETED, $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1315
1316                 $s = $this->replaceFreeExternalLinks( array_shift( $bits ) );
1317
1318                 $i = 0;
1319                 while ( $i<count( $bits ) ) {
1320                         $url = $bits[$i++];
1321                         $protocol = $bits[$i++];
1322                         $text = $bits[$i++];
1323                         $trail = $bits[$i++];
1324
1325                         # The characters '<' and '>' (which were escaped by
1326                         # removeHTMLtags()) should not be included in
1327                         # URLs, per RFC 2396.
1328                         $m2 = array();
1329                         if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1330                                 $text = substr($url, $m2[0][1]) . ' ' . $text;
1331                                 $url = substr($url, 0, $m2[0][1]);
1332                         }
1333
1334                         # If the link text is an image URL, replace it with an <img> tag
1335                         # This happened by accident in the original parser, but some people used it extensively
1336                         $img = $this->maybeMakeExternalImage( $text );
1337                         if ( $img !== false ) {
1338                                 $text = $img;
1339                         }
1340
1341                         $dtrail = '';
1342
1343                         # Set linktype for CSS - if URL==text, link is essentially free
1344                         $linktype = ($text == $url) ? 'free' : 'text';
1345
1346                         # No link text, e.g. [http://domain.tld/some.link]
1347                         if ( $text == '' ) {
1348                                 # Autonumber if allowed. See bug #5918
1349                                 if ( strpos( wfUrlProtocols(), substr($protocol, 0, strpos($protocol, ':')) ) !== false ) {
1350                                         $text = '[' . ++$this->mAutonumber . ']';
1351                                         $linktype = 'autonumber';
1352                                 } else {
1353                                         # Otherwise just use the URL
1354                                         $text = htmlspecialchars( $url );
1355                                         $linktype = 'free';
1356                                 }
1357                         } else {
1358                                 # Have link text, e.g. [http://domain.tld/some.link text]s
1359                                 # Check for trail
1360                                 list( $dtrail, $trail ) = Linker::splitTrail( $trail );
1361                         }
1362
1363                         $text = $wgContLang->markNoConversion($text);
1364
1365                         $url = Sanitizer::cleanUrl( $url );
1366
1367                         # Process the trail (i.e. everything after this link up until start of the next link),
1368                         # replacing any non-bracketed links
1369                         $trail = $this->replaceFreeExternalLinks( $trail );
1370
1371                         # Use the encoded URL
1372                         # This means that users can paste URLs directly into the text
1373                         # Funny characters like &ouml; aren't valid in URLs anyway
1374                         # This was changed in August 2004
1375                         $s .= $sk->makeExternalLink( $url, $text, false, $linktype, $this->mTitle->getNamespace() ) . $dtrail . $trail;
1376
1377                         # Register link in the output object.
1378                         # Replace unnecessary URL escape codes with the referenced character
1379                         # This prevents spammers from hiding links from the filters
1380                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1381                         $this->mOutput->addExternalLink( $pasteurized );
1382                 }
1383
1384                 wfProfileOut( $fname );
1385                 return $s;
1386         }
1387
1388         /**
1389          * Replace anything that looks like a URL with a link
1390          * @private
1391          */
1392         function replaceFreeExternalLinks( $text ) {
1393                 global $wgContLang;
1394                 $fname = 'Parser::replaceFreeExternalLinks';
1395                 wfProfileIn( $fname );
1396
1397                 $bits = preg_split( '/(\b(?:' . wfUrlProtocols() . '))/S', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
1398                 $s = array_shift( $bits );
1399                 $i = 0;
1400
1401                 $sk = $this->mOptions->getSkin();
1402
1403                 while ( $i < count( $bits ) ){
1404                         $protocol = $bits[$i++];
1405                         $remainder = $bits[$i++];
1406
1407                         $m = array();
1408                         if ( preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $remainder, $m ) ) {
1409                                 # Found some characters after the protocol that look promising
1410                                 $url = $protocol . $m[1];
1411                                 $trail = $m[2];
1412
1413                                 # special case: handle urls as url args:
1414                                 # http://www.example.com/foo?=http://www.example.com/bar
1415                                 if(strlen($trail) == 0 &&
1416                                         isset($bits[$i]) &&
1417                                         preg_match('/^'. wfUrlProtocols() . '$/S', $bits[$i]) &&
1418                                         preg_match( '/^('.EXT_LINK_URL_CLASS.'+)(.*)$/s', $bits[$i + 1], $m ))
1419                                 {
1420                                         # add protocol, arg
1421                                         $url .= $bits[$i] . $m[1]; # protocol, url as arg to previous link
1422                                         $i += 2;
1423                                         $trail = $m[2];
1424                                 }
1425
1426                                 # The characters '<' and '>' (which were escaped by
1427                                 # removeHTMLtags()) should not be included in
1428                                 # URLs, per RFC 2396.
1429                                 $m2 = array();
1430                                 if (preg_match('/&(lt|gt);/', $url, $m2, PREG_OFFSET_CAPTURE)) {
1431                                         $trail = substr($url, $m2[0][1]) . $trail;
1432                                         $url = substr($url, 0, $m2[0][1]);
1433                                 }
1434
1435                                 # Move trailing punctuation to $trail
1436                                 $sep = ',;\.:!?';
1437                                 # If there is no left bracket, then consider right brackets fair game too
1438                                 if ( strpos( $url, '(' ) === false ) {
1439                                         $sep .= ')';
1440                                 }
1441
1442                                 $numSepChars = strspn( strrev( $url ), $sep );
1443                                 if ( $numSepChars ) {
1444                                         $trail = substr( $url, -$numSepChars ) . $trail;
1445                                         $url = substr( $url, 0, -$numSepChars );
1446                                 }
1447
1448                                 $url = Sanitizer::cleanUrl( $url );
1449
1450                                 # Is this an external image?
1451                                 $text = $this->maybeMakeExternalImage( $url );
1452                                 if ( $text === false ) {
1453                                         # Not an image, make a link
1454                                         $text = $sk->makeExternalLink( $url, $wgContLang->markNoConversion($url), true, 'free', $this->mTitle->getNamespace() );
1455                                         # Register it in the output object...
1456                                         # Replace unnecessary URL escape codes with their equivalent characters
1457                                         $pasteurized = Parser::replaceUnusualEscapes( $url );
1458                                         $this->mOutput->addExternalLink( $pasteurized );
1459                                 }
1460                                 $s .= $text . $trail;
1461                         } else {
1462                                 $s .= $protocol . $remainder;
1463                         }
1464                 }
1465                 wfProfileOut( $fname );
1466                 return $s;
1467         }
1468
1469         /**
1470          * Replace unusual URL escape codes with their equivalent characters
1471          * @param string
1472          * @return string
1473          * @static
1474          * @todo  This can merge genuinely required bits in the path or query string,
1475          *        breaking legit URLs. A proper fix would treat the various parts of
1476          *        the URL differently; as a workaround, just use the output for
1477          *        statistical records, not for actual linking/output.
1478          */
1479         static function replaceUnusualEscapes( $url ) {
1480                 return preg_replace_callback( '/%[0-9A-Fa-f]{2}/',
1481                         array( 'Parser', 'replaceUnusualEscapesCallback' ), $url );
1482         }
1483
1484         /**
1485          * Callback function used in replaceUnusualEscapes().
1486          * Replaces unusual URL escape codes with their equivalent character
1487          * @static
1488          * @private
1489          */
1490         private static function replaceUnusualEscapesCallback( $matches ) {
1491                 $char = urldecode( $matches[0] );
1492                 $ord = ord( $char );
1493                 // Is it an unsafe or HTTP reserved character according to RFC 1738?
1494                 if ( $ord > 32 && $ord < 127 && strpos( '<>"#{}|\^~[]`;/?', $char ) === false ) {
1495                         // No, shouldn't be escaped
1496                         return $char;
1497                 } else {
1498                         // Yes, leave it escaped
1499                         return $matches[0];
1500                 }
1501         }
1502
1503         /**
1504          * make an image if it's allowed, either through the global
1505          * option or through the exception
1506          * @private
1507          */
1508         function maybeMakeExternalImage( $url ) {
1509                 $sk = $this->mOptions->getSkin();
1510                 $imagesfrom = $this->mOptions->getAllowExternalImagesFrom();
1511                 $imagesexception = !empty($imagesfrom);
1512                 $text = false;
1513                 if ( $this->mOptions->getAllowExternalImages()
1514                      || ( $imagesexception && strpos( $url, $imagesfrom ) === 0 ) ) {
1515                         if ( preg_match( EXT_IMAGE_REGEX, $url ) ) {
1516                                 # Image found
1517                                 $text = $sk->makeExternalImage( htmlspecialchars( $url ) );
1518                         }
1519                 }
1520                 return $text;
1521         }
1522
1523         /**
1524          * Process [[ ]] wikilinks
1525          *
1526          * @private
1527          */
1528         function replaceInternalLinks( $s ) {
1529                 global $wgContLang;
1530                 static $fname = 'Parser::replaceInternalLinks' ;
1531
1532                 wfProfileIn( $fname );
1533
1534                 wfProfileIn( $fname.'-setup' );
1535                 static $tc = FALSE;
1536                 # the % is needed to support urlencoded titles as well
1537                 if ( !$tc ) { $tc = Title::legalChars() . '#%'; }
1538
1539                 $sk = $this->mOptions->getSkin();
1540
1541                 #split the entire text string on occurences of [[
1542                 $a = explode( '[[', ' ' . $s );
1543                 #get the first element (all text up to first [[), and remove the space we added
1544                 $s = array_shift( $a );
1545                 $s = substr( $s, 1 );
1546
1547                 # Match a link having the form [[namespace:link|alternate]]trail
1548                 static $e1 = FALSE;
1549                 if ( !$e1 ) { $e1 = "/^([{$tc}]+)(?:\\|(.+?))?]](.*)\$/sD"; }
1550                 # Match cases where there is no "]]", which might still be images
1551                 static $e1_img = FALSE;
1552                 if ( !$e1_img ) { $e1_img = "/^([{$tc}]+)\\|(.*)\$/sD"; }
1553                 # Match the end of a line for a word that's not followed by whitespace,
1554                 # e.g. in the case of 'The Arab al[[Razi]]', 'al' will be matched
1555                 $e2 = wfMsgForContent( 'linkprefix' );
1556
1557                 $useLinkPrefixExtension = $wgContLang->linkPrefixExtension();
1558                 if( is_null( $this->mTitle ) ) {
1559                         throw new MWException( __METHOD__.": \$this->mTitle is null\n" );
1560                 }
1561                 $nottalk = !$this->mTitle->isTalkPage();
1562
1563                 if ( $useLinkPrefixExtension ) {
1564                         $m = array();
1565                         if ( preg_match( $e2, $s, $m ) ) {
1566                                 $first_prefix = $m[2];
1567                         } else {
1568                                 $first_prefix = false;
1569                         }
1570                 } else {
1571                         $prefix = '';
1572                 }
1573
1574                 if($wgContLang->hasVariants()) {
1575                         $selflink = $wgContLang->convertLinkToAllVariants($this->mTitle->getPrefixedText());
1576                 } else {
1577                         $selflink = array($this->mTitle->getPrefixedText());
1578                 }
1579                 $useSubpages = $this->areSubpagesAllowed();
1580                 wfProfileOut( $fname.'-setup' );
1581
1582                 # Loop for each link
1583                 for ($k = 0; isset( $a[$k] ); $k++) {
1584                         $line = $a[$k];
1585                         if ( $useLinkPrefixExtension ) {
1586                                 wfProfileIn( $fname.'-prefixhandling' );
1587                                 if ( preg_match( $e2, $s, $m ) ) {
1588                                         $prefix = $m[2];
1589                                         $s = $m[1];
1590                                 } else {
1591                                         $prefix='';
1592                                 }
1593                                 # first link
1594                                 if($first_prefix) {
1595                                         $prefix = $first_prefix;
1596                                         $first_prefix = false;
1597                                 }
1598                                 wfProfileOut( $fname.'-prefixhandling' );
1599                         }
1600
1601                         $might_be_img = false;
1602
1603                         wfProfileIn( "$fname-e1" );
1604                         if ( preg_match( $e1, $line, $m ) ) { # page with normal text or alt
1605                                 $text = $m[2];
1606                                 # If we get a ] at the beginning of $m[3] that means we have a link that's something like:
1607                                 # [[Image:Foo.jpg|[http://example.com desc]]] <- having three ] in a row fucks up,
1608                                 # the real problem is with the $e1 regex
1609                                 # See bug 1300.
1610                                 #
1611                                 # Still some problems for cases where the ] is meant to be outside punctuation,
1612                                 # and no image is in sight. See bug 2095.
1613                                 #
1614                                 if( $text !== '' &&
1615                                         substr( $m[3], 0, 1 ) === ']' &&
1616                                         strpos($text, '[') !== false
1617                                 )
1618                                 {
1619                                         $text .= ']'; # so that replaceExternalLinks($text) works later
1620                                         $m[3] = substr( $m[3], 1 );
1621                                 }
1622                                 # fix up urlencoded title texts
1623                                 if( strpos( $m[1], '%' ) !== false ) {
1624                                         # Should anchors '#' also be rejected?
1625                                         $m[1] = str_replace( array('<', '>'), array('&lt;', '&gt;'), urldecode($m[1]) );
1626                                 }
1627                                 $trail = $m[3];
1628                         } elseif( preg_match($e1_img, $line, $m) ) { # Invalid, but might be an image with a link in its caption
1629                                 $might_be_img = true;
1630                                 $text = $m[2];
1631                                 if ( strpos( $m[1], '%' ) !== false ) {
1632                                         $m[1] = urldecode($m[1]);
1633                                 }
1634                                 $trail = "";
1635                         } else { # Invalid form; output directly
1636                                 $s .= $prefix . '[[' . $line ;
1637                                 wfProfileOut( "$fname-e1" );
1638                                 continue;
1639                         }
1640                         wfProfileOut( "$fname-e1" );
1641                         wfProfileIn( "$fname-misc" );
1642
1643                         # Don't allow internal links to pages containing
1644                         # PROTO: where PROTO is a valid URL protocol; these
1645                         # should be external links.
1646                         if (preg_match('/^\b(?:' . wfUrlProtocols() . ')/', $m[1])) {
1647                                 $s .= $prefix . '[[' . $line ;
1648                                 continue;
1649                         }
1650
1651                         # Make subpage if necessary
1652                         if( $useSubpages ) {
1653                                 $link = $this->maybeDoSubpageLink( $m[1], $text );
1654                         } else {
1655                                 $link = $m[1];
1656                         }
1657
1658                         $noforce = (substr($m[1], 0, 1) != ':');
1659                         if (!$noforce) {
1660                                 # Strip off leading ':'
1661                                 $link = substr($link, 1);
1662                         }
1663
1664                         wfProfileOut( "$fname-misc" );
1665                         wfProfileIn( "$fname-title" );
1666                         $nt = Title::newFromText( $this->mStripState->unstripNoWiki($link) );
1667                         if( !$nt ) {
1668                                 $s .= $prefix . '[[' . $line;
1669                                 wfProfileOut( "$fname-title" );
1670                                 continue;
1671                         }
1672
1673                         $ns = $nt->getNamespace();
1674                         $iw = $nt->getInterWiki();
1675                         wfProfileOut( "$fname-title" );
1676
1677                         if ($might_be_img) { # if this is actually an invalid link
1678                                 wfProfileIn( "$fname-might_be_img" );
1679                                 if ($ns == NS_IMAGE && $noforce) { #but might be an image
1680                                         $found = false;
1681                                         while (isset ($a[$k+1]) ) {
1682                                                 #look at the next 'line' to see if we can close it there
1683                                                 $spliced = array_splice( $a, $k + 1, 1 );
1684                                                 $next_line = array_shift( $spliced );
1685                                                 $m = explode( ']]', $next_line, 3 );
1686                                                 if ( count( $m ) == 3 ) {
1687                                                         # the first ]] closes the inner link, the second the image
1688                                                         $found = true;
1689                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1690                                                         $trail = $m[2];
1691                                                         break;
1692                                                 } elseif ( count( $m ) == 2 ) {
1693                                                         #if there's exactly one ]] that's fine, we'll keep looking
1694                                                         $text .= "[[{$m[0]}]]{$m[1]}";
1695                                                 } else {
1696                                                         #if $next_line is invalid too, we need look no further
1697                                                         $text .= '[[' . $next_line;
1698                                                         break;
1699                                                 }
1700                                         }
1701                                         if ( !$found ) {
1702                                                 # we couldn't find the end of this imageLink, so output it raw
1703                                                 #but don't ignore what might be perfectly normal links in the text we've examined
1704                                                 $text = $this->replaceInternalLinks($text);
1705                                                 $s .= "{$prefix}[[$link|$text";
1706                                                 # note: no $trail, because without an end, there *is* no trail
1707                                                 wfProfileOut( "$fname-might_be_img" );
1708                                                 continue;
1709                                         }
1710                                 } else { #it's not an image, so output it raw
1711                                         $s .= "{$prefix}[[$link|$text";
1712                                         # note: no $trail, because without an end, there *is* no trail
1713                                         wfProfileOut( "$fname-might_be_img" );
1714                                         continue;
1715                                 }
1716                                 wfProfileOut( "$fname-might_be_img" );
1717                         }
1718
1719                         $wasblank = ( '' == $text );
1720                         if( $wasblank ) $text = $link;
1721
1722                         # Link not escaped by : , create the various objects
1723                         if( $noforce ) {
1724
1725                                 # Interwikis
1726                                 wfProfileIn( "$fname-interwiki" );
1727                                 if( $iw && $this->mOptions->getInterwikiMagic() && $nottalk && $wgContLang->getLanguageName( $iw ) ) {
1728                                         $this->mOutput->addLanguageLink( $nt->getFullText() );
1729                                         $s = rtrim($s . $prefix);
1730                                         $s .= trim($trail, "\n") == '' ? '': $prefix . $trail;
1731                                         wfProfileOut( "$fname-interwiki" );
1732                                         continue;
1733                                 }
1734                                 wfProfileOut( "$fname-interwiki" );
1735
1736                                 if ( $ns == NS_IMAGE ) {
1737                                         wfProfileIn( "$fname-image" );
1738                                         if ( !wfIsBadImage( $nt->getDBkey(), $this->mTitle ) ) {
1739                                                 # recursively parse links inside the image caption
1740                                                 # actually, this will parse them in any other parameters, too,
1741                                                 # but it might be hard to fix that, and it doesn't matter ATM
1742                                                 $text = $this->replaceExternalLinks($text);
1743                                                 $text = $this->replaceInternalLinks($text);
1744
1745                                                 # cloak any absolute URLs inside the image markup, so replaceExternalLinks() won't touch them
1746                                                 $s .= $prefix . $this->armorLinks( $this->makeImage( $nt, $text ) ) . $trail;
1747                                                 $this->mOutput->addImage( $nt->getDBkey() );
1748
1749                                                 wfProfileOut( "$fname-image" );
1750                                                 continue;
1751                                         } else {
1752                                                 # We still need to record the image's presence on the page
1753                                                 $this->mOutput->addImage( $nt->getDBkey() );
1754                                         }
1755                                         wfProfileOut( "$fname-image" );
1756
1757                                 }
1758
1759                                 if ( $ns == NS_CATEGORY ) {
1760                                         wfProfileIn( "$fname-category" );
1761                                         $s = rtrim($s . "\n"); # bug 87
1762
1763                                         if ( $wasblank ) {
1764                                                 $sortkey = $this->getDefaultSort();
1765                                         } else {
1766                                                 $sortkey = $text;
1767                                         }
1768                                         $sortkey = Sanitizer::decodeCharReferences( $sortkey );
1769                                         $sortkey = str_replace( "\n", '', $sortkey );
1770                                         $sortkey = $wgContLang->convertCategoryKey( $sortkey );
1771                                         $this->mOutput->addCategory( $nt->getDBkey(), $sortkey );
1772
1773                                         /**
1774                                          * Strip the whitespace Category links produce, see bug 87
1775                                          * @todo We might want to use trim($tmp, "\n") here.
1776                                          */
1777                                         $s .= trim($prefix . $trail, "\n") == '' ? '': $prefix . $trail;
1778
1779                                         wfProfileOut( "$fname-category" );
1780                                         continue;
1781                                 }
1782                         }
1783
1784                         # Self-link checking
1785                         if( $nt->getFragment() === '' ) {
1786                                 if( in_array( $nt->getPrefixedText(), $selflink, true ) ) {
1787                                         $s .= $prefix . $sk->makeSelfLinkObj( $nt, $text, '', $trail );
1788                                         continue;
1789                                 }
1790                         }
1791
1792                         # Special and Media are pseudo-namespaces; no pages actually exist in them
1793                         if( $ns == NS_MEDIA ) {
1794                                 $link = $sk->makeMediaLinkObj( $nt, $text );
1795                                 # Cloak with NOPARSE to avoid replacement in replaceExternalLinks
1796                                 $s .= $prefix . $this->armorLinks( $link ) . $trail;
1797                                 $this->mOutput->addImage( $nt->getDBkey() );
1798                                 continue;
1799                         } elseif( $ns == NS_SPECIAL ) {
1800                                 $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1801                                 continue;
1802                         } elseif( $ns == NS_IMAGE ) {
1803                                 $img = new Image( $nt );
1804                                 if( $img->exists() ) {
1805                                         // Force a blue link if the file exists; may be a remote
1806                                         // upload on the shared repository, and we want to see its
1807                                         // auto-generated page.
1808                                         $s .= $this->makeKnownLinkHolder( $nt, $text, '', $trail, $prefix );
1809                                         $this->mOutput->addLink( $nt );
1810                                         continue;
1811                                 }
1812                         }
1813                         $s .= $this->makeLinkHolder( $nt, $text, '', $trail, $prefix );
1814                 }
1815                 wfProfileOut( $fname );
1816                 return $s;
1817         }
1818
1819         /**
1820          * Make a link placeholder. The text returned can be later resolved to a real link with
1821          * replaceLinkHolders(). This is done for two reasons: firstly to avoid further
1822          * parsing of interwiki links, and secondly to allow all existence checks and
1823          * article length checks (for stub links) to be bundled into a single query.
1824          *
1825          */
1826         function makeLinkHolder( &$nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1827                 wfProfileIn( __METHOD__ );
1828                 if ( ! is_object($nt) ) {
1829                         # Fail gracefully
1830                         $retVal = "<!-- ERROR -->{$prefix}{$text}{$trail}";
1831                 } else {
1832                         # Separate the link trail from the rest of the link
1833                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1834
1835                         if ( $nt->isExternal() ) {
1836                                 $nr = array_push( $this->mInterwikiLinkHolders['texts'], $prefix.$text.$inside );
1837                                 $this->mInterwikiLinkHolders['titles'][] = $nt;
1838                                 $retVal = '<!--IWLINK '. ($nr-1) ."-->{$trail}";
1839                         } else {
1840                                 $nr = array_push( $this->mLinkHolders['namespaces'], $nt->getNamespace() );
1841                                 $this->mLinkHolders['dbkeys'][] = $nt->getDBkey();
1842                                 $this->mLinkHolders['queries'][] = $query;
1843                                 $this->mLinkHolders['texts'][] = $prefix.$text.$inside;
1844                                 $this->mLinkHolders['titles'][] = $nt;
1845
1846                                 $retVal = '<!--LINK '. ($nr-1) ."-->{$trail}";
1847                         }
1848                 }
1849                 wfProfileOut( __METHOD__ );
1850                 return $retVal;
1851         }
1852
1853         /**
1854          * Render a forced-blue link inline; protect against double expansion of
1855          * URLs if we're in a mode that prepends full URL prefixes to internal links.
1856          * Since this little disaster has to split off the trail text to avoid
1857          * breaking URLs in the following text without breaking trails on the
1858          * wiki links, it's been made into a horrible function.
1859          *
1860          * @param Title $nt
1861          * @param string $text
1862          * @param string $query
1863          * @param string $trail
1864          * @param string $prefix
1865          * @return string HTML-wikitext mix oh yuck
1866          */
1867         function makeKnownLinkHolder( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
1868                 list( $inside, $trail ) = Linker::splitTrail( $trail );
1869                 $sk = $this->mOptions->getSkin();
1870                 $link = $sk->makeKnownLinkObj( $nt, $text, $query, $inside, $prefix );
1871                 return $this->armorLinks( $link ) . $trail;
1872         }
1873
1874         /**
1875          * Insert a NOPARSE hacky thing into any inline links in a chunk that's
1876          * going to go through further parsing steps before inline URL expansion.
1877          *
1878          * In particular this is important when using action=render, which causes
1879          * full URLs to be included.
1880          *
1881          * Oh man I hate our multi-layer parser!
1882          *
1883          * @param string more-or-less HTML
1884          * @return string less-or-more HTML with NOPARSE bits
1885          */
1886         function armorLinks( $text ) {
1887                 return preg_replace( '/\b(' . wfUrlProtocols() . ')/',
1888                         "{$this->mUniqPrefix}NOPARSE$1", $text );
1889         }
1890
1891         /**
1892          * Return true if subpage links should be expanded on this page.
1893          * @return bool
1894          */
1895         function areSubpagesAllowed() {
1896                 # Some namespaces don't allow subpages
1897                 global $wgNamespacesWithSubpages;
1898                 return !empty($wgNamespacesWithSubpages[$this->mTitle->getNamespace()]);
1899         }
1900
1901         /**
1902          * Handle link to subpage if necessary
1903          * @param string $target the source of the link
1904          * @param string &$text the link text, modified as necessary
1905          * @return string the full name of the link
1906          * @private
1907          */
1908         function maybeDoSubpageLink($target, &$text) {
1909                 # Valid link forms:
1910                 # Foobar -- normal
1911                 # :Foobar -- override special treatment of prefix (images, language links)
1912                 # /Foobar -- convert to CurrentPage/Foobar
1913                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1914                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1915                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1916
1917                 $fname = 'Parser::maybeDoSubpageLink';
1918                 wfProfileIn( $fname );
1919                 $ret = $target; # default return value is no change
1920
1921                 # bug 7425
1922                 $target = trim( $target );
1923
1924                 # Some namespaces don't allow subpages,
1925                 # so only perform processing if subpages are allowed
1926                 if( $this->areSubpagesAllowed() ) {
1927                         # Look at the first character
1928                         if( $target != '' && $target{0} == '/' ) {
1929                                 # / at end means we don't want the slash to be shown
1930                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1931                                 if( $trailingSlashes ) {
1932                                         $noslash = $target = substr( $target, 1, -strlen($m[0][0]) );
1933                                 } else {
1934                                         $noslash = substr( $target, 1 );
1935                                 }
1936
1937                                 $ret = $this->mTitle->getPrefixedText(). '/' . trim($noslash);
1938                                 if( '' === $text ) {
1939                                         $text = $target;
1940                                 } # this might be changed for ugliness reasons
1941                         } else {
1942                                 # check for .. subpage backlinks
1943                                 $dotdotcount = 0;
1944                                 $nodotdot = $target;
1945                                 while( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1946                                         ++$dotdotcount;
1947                                         $nodotdot = substr( $nodotdot, 3 );
1948                                 }
1949                                 if($dotdotcount > 0) {
1950                                         $exploded = explode( '/', $this->mTitle->GetPrefixedText() );
1951                                         if( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1952                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1953                                                 # / at the end means don't show full path
1954                                                 if( substr( $nodotdot, -1, 1 ) == '/' ) {
1955                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1956                                                         if( '' === $text ) {
1957                                                                 $text = $nodotdot;
1958                                                         }
1959                                                 }
1960                                                 $nodotdot = trim( $nodotdot );
1961                                                 if( $nodotdot != '' ) {
1962                                                         $ret .= '/' . $nodotdot;
1963                                                 }
1964                                         }
1965                                 }
1966                         }
1967                 }
1968
1969                 wfProfileOut( $fname );
1970                 return $ret;
1971         }
1972
1973         /**#@+
1974          * Used by doBlockLevels()
1975          * @private
1976          */
1977         /* private */ function closeParagraph() {
1978                 $result = '';
1979                 if ( '' != $this->mLastSection ) {
1980                         $result = '</' . $this->mLastSection  . ">\n";
1981                 }
1982                 $this->mInPre = false;
1983                 $this->mLastSection = '';
1984                 return $result;
1985         }
1986         # getCommon() returns the length of the longest common substring
1987         # of both arguments, starting at the beginning of both.
1988         #
1989         /* private */ function getCommon( $st1, $st2 ) {
1990                 $fl = strlen( $st1 );
1991                 $shorter = strlen( $st2 );
1992                 if ( $fl < $shorter ) { $shorter = $fl; }
1993
1994                 for ( $i = 0; $i < $shorter; ++$i ) {
1995                         if ( $st1{$i} != $st2{$i} ) { break; }
1996                 }
1997                 return $i;
1998         }
1999         # These next three functions open, continue, and close the list
2000         # element appropriate to the prefix character passed into them.
2001         #
2002         /* private */ function openList( $char ) {
2003                 $result = $this->closeParagraph();
2004
2005                 if ( '*' == $char ) { $result .= '<ul><li>'; }
2006                 else if ( '#' == $char ) { $result .= '<ol><li>'; }
2007                 else if ( ':' == $char ) { $result .= '<dl><dd>'; }
2008                 else if ( ';' == $char ) {
2009                         $result .= '<dl><dt>';
2010                         $this->mDTopen = true;
2011                 }
2012                 else { $result = '<!-- ERR 1 -->'; }
2013
2014                 return $result;
2015         }
2016
2017         /* private */ function nextItem( $char ) {
2018                 if ( '*' == $char || '#' == $char ) { return '</li><li>'; }
2019                 else if ( ':' == $char || ';' == $char ) {
2020                         $close = '</dd>';
2021                         if ( $this->mDTopen ) { $close = '</dt>'; }
2022                         if ( ';' == $char ) {
2023                                 $this->mDTopen = true;
2024                                 return $close . '<dt>';
2025                         } else {
2026                                 $this->mDTopen = false;
2027                                 return $close . '<dd>';
2028                         }
2029                 }
2030                 return '<!-- ERR 2 -->';
2031         }
2032
2033         /* private */ function closeList( $char ) {
2034                 if ( '*' == $char ) { $text = '</li></ul>'; }
2035                 else if ( '#' == $char ) { $text = '</li></ol>'; }
2036                 else if ( ':' == $char ) {
2037                         if ( $this->mDTopen ) {
2038                                 $this->mDTopen = false;
2039                                 $text = '</dt></dl>';
2040                         } else {
2041                                 $text = '</dd></dl>';
2042                         }
2043                 }
2044                 else {  return '<!-- ERR 3 -->'; }
2045                 return $text."\n";
2046         }
2047         /**#@-*/
2048
2049         /**
2050          * Make lists from lines starting with ':', '*', '#', etc.
2051          *
2052          * @private
2053          * @return string the lists rendered as HTML
2054          */
2055         function doBlockLevels( $text, $linestart ) {
2056                 $fname = 'Parser::doBlockLevels';
2057                 wfProfileIn( $fname );
2058
2059                 # Parsing through the text line by line.  The main thing
2060                 # happening here is handling of block-level elements p, pre,
2061                 # and making lists from lines starting with * # : etc.
2062                 #
2063                 $textLines = explode( "\n", $text );
2064
2065                 $lastPrefix = $output = '';
2066                 $this->mDTopen = $inBlockElem = false;
2067                 $prefixLength = 0;
2068                 $paragraphStack = false;
2069
2070                 if ( !$linestart ) {
2071                         $output .= array_shift( $textLines );
2072                 }
2073                 foreach ( $textLines as $oLine ) {
2074                         $lastPrefixLength = strlen( $lastPrefix );
2075                         $preCloseMatch = preg_match('/<\\/pre/i', $oLine );
2076                         $preOpenMatch = preg_match('/<pre/i', $oLine );
2077                         if ( !$this->mInPre ) {
2078                                 # Multiple prefixes may abut each other for nested lists.
2079                                 $prefixLength = strspn( $oLine, '*#:;' );
2080                                 $pref = substr( $oLine, 0, $prefixLength );
2081
2082                                 # eh?
2083                                 $pref2 = str_replace( ';', ':', $pref );
2084                                 $t = substr( $oLine, $prefixLength );
2085                                 $this->mInPre = !empty($preOpenMatch);
2086                         } else {
2087                                 # Don't interpret any other prefixes in preformatted text
2088                                 $prefixLength = 0;
2089                                 $pref = $pref2 = '';
2090                                 $t = $oLine;
2091                         }
2092
2093                         # List generation
2094                         if( $prefixLength && 0 == strcmp( $lastPrefix, $pref2 ) ) {
2095                                 # Same as the last item, so no need to deal with nesting or opening stuff
2096                                 $output .= $this->nextItem( substr( $pref, -1 ) );
2097                                 $paragraphStack = false;
2098
2099                                 if ( substr( $pref, -1 ) == ';') {
2100                                         # The one nasty exception: definition lists work like this:
2101                                         # ; title : definition text
2102                                         # So we check for : in the remainder text to split up the
2103                                         # title and definition, without b0rking links.
2104                                         $term = $t2 = '';
2105                                         if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2106                                                 $t = $t2;
2107                                                 $output .= $term . $this->nextItem( ':' );
2108                                         }
2109                                 }
2110                         } elseif( $prefixLength || $lastPrefixLength ) {
2111                                 # Either open or close a level...
2112                                 $commonPrefixLength = $this->getCommon( $pref, $lastPrefix );
2113                                 $paragraphStack = false;
2114
2115                                 while( $commonPrefixLength < $lastPrefixLength ) {
2116                                         $output .= $this->closeList( $lastPrefix{$lastPrefixLength-1} );
2117                                         --$lastPrefixLength;
2118                                 }
2119                                 if ( $prefixLength <= $commonPrefixLength && $commonPrefixLength > 0 ) {
2120                                         $output .= $this->nextItem( $pref{$commonPrefixLength-1} );
2121                                 }
2122                                 while ( $prefixLength > $commonPrefixLength ) {
2123                                         $char = substr( $pref, $commonPrefixLength, 1 );
2124                                         $output .= $this->openList( $char );
2125
2126                                         if ( ';' == $char ) {
2127                                                 # FIXME: This is dupe of code above
2128                                                 if ($this->findColonNoLinks($t, $term, $t2) !== false) {
2129                                                         $t = $t2;
2130                                                         $output .= $term . $this->nextItem( ':' );
2131                                                 }
2132                                         }
2133                                         ++$commonPrefixLength;
2134                                 }
2135                                 $lastPrefix = $pref2;
2136                         }
2137                         if( 0 == $prefixLength ) {
2138                                 wfProfileIn( "$fname-paragraph" );
2139                                 # No prefix (not in list)--go to paragraph mode
2140                                 // XXX: use a stack for nestable elements like span, table and div
2141                                 $openmatch = preg_match('/(?:<table|<blockquote|<h1|<h2|<h3|<h4|<h5|<h6|<pre|<tr|<p|<ul|<ol|<li|<\\/tr|<\\/td|<\\/th)/iS', $t );
2142                                 $closematch = preg_match(
2143                                         '/(?:<\\/table|<\\/blockquote|<\\/h1|<\\/h2|<\\/h3|<\\/h4|<\\/h5|<\\/h6|'.
2144                                         '<td|<th|<\\/?div|<hr|<\\/pre|<\\/p|'.$this->mUniqPrefix.'-pre|<\\/li|<\\/ul|<\\/ol|<\\/?center)/iS', $t );
2145                                 if ( $openmatch or $closematch ) {
2146                                         $paragraphStack = false;
2147                                         # TODO bug 5718: paragraph closed
2148                                         $output .= $this->closeParagraph();
2149                                         if ( $preOpenMatch and !$preCloseMatch ) {
2150                                                 $this->mInPre = true;
2151                                         }
2152                                         if ( $closematch ) {
2153                                                 $inBlockElem = false;
2154                                         } else {
2155                                                 $inBlockElem = true;
2156                                         }
2157                                 } else if ( !$inBlockElem && !$this->mInPre ) {
2158                                         if ( ' ' == $t{0} and ( $this->mLastSection == 'pre' or trim($t) != '' ) ) {
2159                                                 // pre
2160                                                 if ($this->mLastSection != 'pre') {
2161                                                         $paragraphStack = false;
2162                                                         $output .= $this->closeParagraph().'<pre>';
2163                                                         $this->mLastSection = 'pre';
2164                                                 }
2165                                                 $t = substr( $t, 1 );
2166                                         } else {
2167                                                 // paragraph
2168                                                 if ( '' == trim($t) ) {
2169                                                         if ( $paragraphStack ) {
2170                                                                 $output .= $paragraphStack.'<br />';
2171                                                                 $paragraphStack = false;
2172                                                                 $this->mLastSection = 'p';
2173                                                         } else {
2174                                                                 if ($this->mLastSection != 'p' ) {
2175                                                                         $output .= $this->closeParagraph();
2176                                                                         $this->mLastSection = '';
2177                                                                         $paragraphStack = '<p>';
2178                                                                 } else {
2179                                                                         $paragraphStack = '</p><p>';
2180                                                                 }
2181                                                         }
2182                                                 } else {
2183                                                         if ( $paragraphStack ) {
2184                                                                 $output .= $paragraphStack;
2185                                                                 $paragraphStack = false;
2186                                                                 $this->mLastSection = 'p';
2187                                                         } else if ($this->mLastSection != 'p') {
2188                                                                 $output .= $this->closeParagraph().'<p>';
2189                                                                 $this->mLastSection = 'p';
2190                                                         }
2191                                                 }
2192                                         }
2193                                 }
2194                                 wfProfileOut( "$fname-paragraph" );
2195                         }
2196                         // somewhere above we forget to get out of pre block (bug 785)
2197                         if($preCloseMatch && $this->mInPre) {
2198                                 $this->mInPre = false;
2199                         }
2200                         if ($paragraphStack === false) {
2201                                 $output .= $t."\n";
2202                         }
2203                 }
2204                 while ( $prefixLength ) {
2205                         $output .= $this->closeList( $pref2{$prefixLength-1} );
2206                         --$prefixLength;
2207                 }
2208                 if ( '' != $this->mLastSection ) {
2209                         $output .= '</' . $this->mLastSection . '>';
2210                         $this->mLastSection = '';
2211                 }
2212
2213                 wfProfileOut( $fname );
2214                 return $output;
2215         }
2216
2217         /**
2218          * Split up a string on ':', ignoring any occurences inside tags
2219          * to prevent illegal overlapping.
2220          * @param string $str the string to split
2221          * @param string &$before set to everything before the ':'
2222          * @param string &$after set to everything after the ':'
2223          * return string the position of the ':', or false if none found
2224          */
2225         function findColonNoLinks($str, &$before, &$after) {
2226                 $fname = 'Parser::findColonNoLinks';
2227                 wfProfileIn( $fname );
2228
2229                 $pos = strpos( $str, ':' );
2230                 if( $pos === false ) {
2231                         // Nothing to find!
2232                         wfProfileOut( $fname );
2233                         return false;
2234                 }
2235
2236                 $lt = strpos( $str, '<' );
2237                 if( $lt === false || $lt > $pos ) {
2238                         // Easy; no tag nesting to worry about
2239                         $before = substr( $str, 0, $pos );
2240                         $after = substr( $str, $pos+1 );
2241                         wfProfileOut( $fname );
2242                         return $pos;
2243                 }
2244
2245                 // Ugly state machine to walk through avoiding tags.
2246                 $state = MW_COLON_STATE_TEXT;
2247                 $stack = 0;
2248                 $len = strlen( $str );
2249                 for( $i = 0; $i < $len; $i++ ) {
2250                         $c = $str{$i};
2251
2252                         switch( $state ) {
2253                         // (Using the number is a performance hack for common cases)
2254                         case 0: // MW_COLON_STATE_TEXT:
2255                                 switch( $c ) {
2256                                 case "<":
2257                                         // Could be either a <start> tag or an </end> tag
2258                                         $state = MW_COLON_STATE_TAGSTART;
2259                                         break;
2260                                 case ":":
2261                                         if( $stack == 0 ) {
2262                                                 // We found it!
2263                                                 $before = substr( $str, 0, $i );
2264                                                 $after = substr( $str, $i + 1 );
2265                                                 wfProfileOut( $fname );
2266                                                 return $i;
2267                                         }
2268                                         // Embedded in a tag; don't break it.
2269                                         break;
2270                                 default:
2271                                         // Skip ahead looking for something interesting
2272                                         $colon = strpos( $str, ':', $i );
2273                                         if( $colon === false ) {
2274                                                 // Nothing else interesting
2275                                                 wfProfileOut( $fname );
2276                                                 return false;
2277                                         }
2278                                         $lt = strpos( $str, '<', $i );
2279                                         if( $stack === 0 ) {
2280                                                 if( $lt === false || $colon < $lt ) {
2281                                                         // We found it!
2282                                                         $before = substr( $str, 0, $colon );
2283                                                         $after = substr( $str, $colon + 1 );
2284                                                         wfProfileOut( $fname );
2285                                                         return $i;
2286                                                 }
2287                                         }
2288                                         if( $lt === false ) {
2289                                                 // Nothing else interesting to find; abort!
2290                                                 // We're nested, but there's no close tags left. Abort!
2291                                                 break 2;
2292                                         }
2293                                         // Skip ahead to next tag start
2294                                         $i = $lt;
2295                                         $state = MW_COLON_STATE_TAGSTART;
2296                                 }
2297                                 break;
2298                         case 1: // MW_COLON_STATE_TAG:
2299                                 // In a <tag>
2300                                 switch( $c ) {
2301                                 case ">":
2302                                         $stack++;
2303                                         $state = MW_COLON_STATE_TEXT;
2304                                         break;
2305                                 case "/":
2306                                         // Slash may be followed by >?
2307                                         $state = MW_COLON_STATE_TAGSLASH;
2308                                         break;
2309                                 default:
2310                                         // ignore
2311                                 }
2312                                 break;
2313                         case 2: // MW_COLON_STATE_TAGSTART:
2314                                 switch( $c ) {
2315                                 case "/":
2316                                         $state = MW_COLON_STATE_CLOSETAG;
2317                                         break;
2318                                 case "!":
2319                                         $state = MW_COLON_STATE_COMMENT;
2320                                         break;
2321                                 case ">":
2322                                         // Illegal early close? This shouldn't happen D:
2323                                         $state = MW_COLON_STATE_TEXT;
2324                                         break;
2325                                 default:
2326                                         $state = MW_COLON_STATE_TAG;
2327                                 }
2328                                 break;
2329                         case 3: // MW_COLON_STATE_CLOSETAG:
2330                                 // In a </tag>
2331                                 if( $c == ">" ) {
2332                                         $stack--;
2333                                         if( $stack < 0 ) {
2334                                                 wfDebug( "Invalid input in $fname; too many close tags\n" );
2335                                                 wfProfileOut( $fname );
2336                                                 return false;
2337                                         }
2338                                         $state = MW_COLON_STATE_TEXT;
2339                                 }
2340                                 break;
2341                         case MW_COLON_STATE_TAGSLASH:
2342                                 if( $c == ">" ) {
2343                                         // Yes, a self-closed tag <blah/>
2344                                         $state = MW_COLON_STATE_TEXT;
2345                                 } else {
2346                                         // Probably we're jumping the gun, and this is an attribute
2347                                         $state = MW_COLON_STATE_TAG;
2348                                 }
2349                                 break;
2350                         case 5: // MW_COLON_STATE_COMMENT:
2351                                 if( $c == "-" ) {
2352                                         $state = MW_COLON_STATE_COMMENTDASH;
2353                                 }
2354                                 break;
2355                         case MW_COLON_STATE_COMMENTDASH:
2356                                 if( $c == "-" ) {
2357                                         $state = MW_COLON_STATE_COMMENTDASHDASH;
2358                                 } else {
2359                                         $state = MW_COLON_STATE_COMMENT;
2360                                 }
2361                                 break;
2362                         case MW_COLON_STATE_COMMENTDASHDASH:
2363                                 if( $c == ">" ) {
2364                                         $state = MW_COLON_STATE_TEXT;
2365                                 } else {
2366                                         $state = MW_COLON_STATE_COMMENT;
2367                                 }
2368                                 break;
2369                         default:
2370                                 throw new MWException( "State machine error in $fname" );
2371                         }
2372                 }
2373                 if( $stack > 0 ) {
2374                         wfDebug( "Invalid input in $fname; not enough close tags (stack $stack, state $state)\n" );
2375                         return false;
2376                 }
2377                 wfProfileOut( $fname );
2378                 return false;
2379         }
2380
2381         /**
2382          * Return value of a magic variable (like PAGENAME)
2383          *
2384          * @private
2385          */
2386         function getVariableValue( $index ) {
2387                 global $wgContLang, $wgSitename, $wgServer, $wgServerName, $wgScriptPath;
2388
2389                 /**
2390                  * Some of these require message or data lookups and can be
2391                  * expensive to check many times.
2392                  */
2393                 static $varCache = array();
2394                 if ( wfRunHooks( 'ParserGetVariableValueVarCache', array( &$this, &$varCache ) ) ) {
2395                         if ( isset( $varCache[$index] ) ) {
2396                                 return $varCache[$index];
2397                         }
2398                 }
2399
2400                 $ts = time();
2401                 wfRunHooks( 'ParserGetVariableValueTs', array( &$this, &$ts ) );
2402
2403                 # Use the time zone
2404                 global $wgLocaltimezone;
2405                 if ( isset( $wgLocaltimezone ) ) {
2406                         $oldtz = getenv( 'TZ' );
2407                         putenv( 'TZ='.$wgLocaltimezone );
2408                 }
2409                 $localTimestamp = date( 'YmdHis', $ts );
2410                 $localMonth = date( 'm', $ts );
2411                 $localMonthName = date( 'n', $ts );
2412                 $localDay = date( 'j', $ts );
2413                 $localDay2 = date( 'd', $ts );
2414                 $localDayOfWeek = date( 'w', $ts );
2415                 $localWeek = date( 'W', $ts );
2416                 $localYear = date( 'Y', $ts );
2417                 $localHour = date( 'H', $ts );
2418                 if ( isset( $wgLocaltimezone ) ) {
2419                         putenv( 'TZ='.$oldtz );
2420                 }
2421
2422                 switch ( $index ) {
2423                         case 'currentmonth':
2424                                 return $varCache[$index] = $wgContLang->formatNum( date( 'm', $ts ) );
2425                         case 'currentmonthname':
2426                                 return $varCache[$index] = $wgContLang->getMonthName( date( 'n', $ts ) );
2427                         case 'currentmonthnamegen':
2428                                 return $varCache[$index] = $wgContLang->getMonthNameGen( date( 'n', $ts ) );
2429                         case 'currentmonthabbrev':
2430                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( date( 'n', $ts ) );
2431                         case 'currentday':
2432                                 return $varCache[$index] = $wgContLang->formatNum( date( 'j', $ts ) );
2433                         case 'currentday2':
2434                                 return $varCache[$index] = $wgContLang->formatNum( date( 'd', $ts ) );
2435                         case 'localmonth':
2436                                 return $varCache[$index] = $wgContLang->formatNum( $localMonth );
2437                         case 'localmonthname':
2438                                 return $varCache[$index] = $wgContLang->getMonthName( $localMonthName );
2439                         case 'localmonthnamegen':
2440                                 return $varCache[$index] = $wgContLang->getMonthNameGen( $localMonthName );
2441                         case 'localmonthabbrev':
2442                                 return $varCache[$index] = $wgContLang->getMonthAbbreviation( $localMonthName );
2443                         case 'localday':
2444                                 return $varCache[$index] = $wgContLang->formatNum( $localDay );
2445                         case 'localday2':
2446                                 return $varCache[$index] = $wgContLang->formatNum( $localDay2 );
2447                         case 'pagename':
2448                                 return $this->mTitle->getText();
2449                         case 'pagenamee':
2450                                 return $this->mTitle->getPartialURL();
2451                         case 'fullpagename':
2452                                 return $this->mTitle->getPrefixedText();
2453                         case 'fullpagenamee':
2454                                 return $this->mTitle->getPrefixedURL();
2455                         case 'subpagename':
2456                                 return $this->mTitle->getSubpageText();
2457                         case 'subpagenamee':
2458                                 return $this->mTitle->getSubpageUrlForm();
2459                         case 'basepagename':
2460                                 return $this->mTitle->getBaseText();
2461                         case 'basepagenamee':
2462                                 return wfUrlEncode( str_replace( ' ', '_', $this->mTitle->getBaseText() ) );
2463                         case 'talkpagename':
2464                                 if( $this->mTitle->canTalk() ) {
2465                                         $talkPage = $this->mTitle->getTalkPage();
2466                                         return $talkPage->getPrefixedText();
2467                                 } else {
2468                                         return '';
2469                                 }
2470                         case 'talkpagenamee':
2471                                 if( $this->mTitle->canTalk() ) {
2472                                         $talkPage = $this->mTitle->getTalkPage();
2473                                         return $talkPage->getPrefixedUrl();
2474                                 } else {
2475                                         return '';
2476                                 }
2477                         case 'subjectpagename':
2478                                 $subjPage = $this->mTitle->getSubjectPage();
2479                                 return $subjPage->getPrefixedText();
2480                         case 'subjectpagenamee':
2481                                 $subjPage = $this->mTitle->getSubjectPage();
2482                                 return $subjPage->getPrefixedUrl();
2483                         case 'revisionid':
2484                                 return $this->mRevisionId;
2485                         case 'revisionday':
2486                                 return intval( substr( $this->getRevisionTimestamp(), 6, 2 ) );
2487                         case 'revisionday2':
2488                                 return substr( $this->getRevisionTimestamp(), 6, 2 );
2489                         case 'revisionmonth':
2490                                 return intval( substr( $this->getRevisionTimestamp(), 4, 2 ) );
2491                         case 'revisionyear':
2492                                 return substr( $this->getRevisionTimestamp(), 0, 4 );
2493                         case 'revisiontimestamp':
2494                                 return $this->getRevisionTimestamp();
2495                         case 'namespace':
2496                                 return str_replace('_',' ',$wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2497                         case 'namespacee':
2498                                 return wfUrlencode( $wgContLang->getNsText( $this->mTitle->getNamespace() ) );
2499                         case 'talkspace':
2500                                 return $this->mTitle->canTalk() ? str_replace('_',' ',$this->mTitle->getTalkNsText()) : '';
2501                         case 'talkspacee':
2502                                 return $this->mTitle->canTalk() ? wfUrlencode( $this->mTitle->getTalkNsText() ) : '';
2503                         case 'subjectspace':
2504                                 return $this->mTitle->getSubjectNsText();
2505                         case 'subjectspacee':
2506                                 return( wfUrlencode( $this->mTitle->getSubjectNsText() ) );
2507                         case 'currentdayname':
2508                                 return $varCache[$index] = $wgContLang->getWeekdayName( date( 'w', $ts ) + 1 );
2509                         case 'currentyear':
2510                                 return $varCache[$index] = $wgContLang->formatNum( date( 'Y', $ts ), true );
2511                         case 'currenttime':
2512                                 return $varCache[$index] = $wgContLang->time( wfTimestamp( TS_MW, $ts ), false, false );
2513                         case 'currenthour':
2514                                 return $varCache[$index] = $wgContLang->formatNum( date( 'H', $ts ), true );
2515                         case 'currentweek':
2516                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2517                                 // int to remove the padding
2518                                 return $varCache[$index] = $wgContLang->formatNum( (int)date( 'W', $ts ) );
2519                         case 'currentdow':
2520                                 return $varCache[$index] = $wgContLang->formatNum( date( 'w', $ts ) );
2521                         case 'localdayname':
2522                                 return $varCache[$index] = $wgContLang->getWeekdayName( $localDayOfWeek + 1 );
2523                         case 'localyear':
2524                                 return $varCache[$index] = $wgContLang->formatNum( $localYear, true );
2525                         case 'localtime':
2526                                 return $varCache[$index] = $wgContLang->time( $localTimestamp, false, false );
2527                         case 'localhour':
2528                                 return $varCache[$index] = $wgContLang->formatNum( $localHour, true );
2529                         case 'localweek':
2530                                 // @bug 4594 PHP5 has it zero padded, PHP4 does not, cast to
2531                                 // int to remove the padding
2532                                 return $varCache[$index] = $wgContLang->formatNum( (int)$localWeek );
2533                         case 'localdow':
2534                                 return $varCache[$index] = $wgContLang->formatNum( $localDayOfWeek );
2535                         case 'numberofarticles':
2536                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::articles() );
2537                         case 'numberoffiles':
2538                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::images() );
2539                         case 'numberofusers':
2540                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::users() );
2541                         case 'numberofpages':
2542                                 return $varCache[$index] = $wgContLang->formatNum( SiteStats::pages() );
2543                         case 'numberofadmins':
2544                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::admins() );
2545                         case 'numberofedits':
2546                                 return $varCache[$index]  = $wgContLang->formatNum( SiteStats::edits() );
2547                         case 'currenttimestamp':
2548                                 return $varCache[$index] = wfTimestampNow();
2549                         case 'localtimestamp':
2550                                 return $varCache[$index] = $localTimestamp;
2551                         case 'currentversion':
2552                                 return $varCache[$index] = SpecialVersion::getVersion();
2553                         case 'sitename':
2554                                 return $wgSitename;
2555                         case 'server':
2556                                 return $wgServer;
2557                         case 'servername':
2558                                 return $wgServerName;
2559                         case 'scriptpath':
2560                                 return $wgScriptPath;
2561                         case 'directionmark':
2562                                 return $wgContLang->getDirMark();
2563                         case 'userlanguage':
2564                                 global $wgLang;
2565                                 return $wgLang->getCode();
2566                         case 'contentlanguage':
2567                                 return $wgContLang->getCode();
2568                         default:
2569                                 $ret = null;
2570                                 if ( wfRunHooks( 'ParserGetVariableValueSwitch', array( &$this, &$varCache, &$index, &$ret ) ) )
2571                                         return $ret;
2572                                 else
2573                                         return null;
2574                 }
2575         }
2576
2577         /**
2578          * initialise the magic variables (like CURRENTMONTHNAME)
2579          *
2580          * @private
2581          */
2582         function initialiseVariables() {
2583                 $fname = 'Parser::initialiseVariables';
2584                 wfProfileIn( $fname );
2585                 $variableIDs = MagicWord::getVariableIDs();
2586
2587                 $this->mVariables = array();
2588                 foreach ( $variableIDs as $id ) {
2589                         $mw =& MagicWord::get( $id );
2590                         $mw->addToArray( $this->mVariables, $id );
2591                 }
2592                 wfProfileOut( $fname );
2593         }
2594
2595         /**
2596          * parse any parentheses in format ((title|part|part))
2597          * and call callbacks to get a replacement text for any found piece
2598          *
2599          * @param string $text The text to parse
2600          * @param array $callbacks rules in form:
2601          *     '{' => array(                            # opening parentheses
2602          *                                      'end' => '}',   # closing parentheses
2603          *                                      'cb' => array(2 => callback,    # replacement callback to call if {{..}} is found
2604          *                                                                3 => callback         # replacement callback to call if {{{..}}} is found
2605          *                                                                )
2606          *                                      )
2607          *                                      'min' => 2,     # Minimum parenthesis count in cb
2608          *                                      'max' => 3,     # Maximum parenthesis count in cb
2609          * @private
2610          */
2611         function replace_callback ($text, $callbacks) {
2612                 wfProfileIn( __METHOD__ );
2613                 $openingBraceStack = array();   # this array will hold a stack of parentheses which are not closed yet
2614                 $lastOpeningBrace = -1;                 # last not closed parentheses
2615
2616                 $validOpeningBraces = implode( '', array_keys( $callbacks ) );
2617
2618                 $i = 0;
2619                 while ( $i < strlen( $text ) ) {
2620                         # Find next opening brace, closing brace or pipe
2621                         if ( $lastOpeningBrace == -1 ) {
2622                                 $currentClosing = '';
2623                                 $search = $validOpeningBraces;
2624                         } else {
2625                                 $currentClosing = $openingBraceStack[$lastOpeningBrace]['braceEnd'];
2626                                 $search = $validOpeningBraces . '|' . $currentClosing;
2627                         }
2628                         $rule = null;
2629                         $i += strcspn( $text, $search, $i );
2630                         if ( $i < strlen( $text ) ) {
2631                                 if ( $text[$i] == '|' ) {
2632                                         $found = 'pipe';
2633                                 } elseif ( $text[$i] == $currentClosing ) {
2634                                         $found = 'close';
2635                                 } elseif ( isset( $callbacks[$text[$i]] ) ) {
2636                                         $found = 'open';
2637                                         $rule = $callbacks[$text[$i]];
2638                                 } else {
2639                                         # Some versions of PHP have a strcspn which stops on null characters
2640                                         # Ignore and continue
2641                                         ++$i;
2642                                         continue;
2643                                 }
2644                         } else {
2645                                 # All done
2646                                 break;
2647                         }
2648
2649                         if ( $found == 'open' ) {
2650                                 # found opening brace, let's add it to parentheses stack
2651                                 $piece = array('brace' => $text[$i],
2652                                                            'braceEnd' => $rule['end'],
2653                                                            'title' => '',
2654                                                            'parts' => null);
2655
2656                                 # count opening brace characters
2657                                 $piece['count'] = strspn( $text, $piece['brace'], $i );
2658                                 $piece['startAt'] = $piece['partStart'] = $i + $piece['count'];
2659                                 $i += $piece['count'];
2660
2661                                 # we need to add to stack only if opening brace count is enough for one of the rules
2662                                 if ( $piece['count'] >= $rule['min'] ) {
2663                                         $lastOpeningBrace ++;
2664                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2665                                 }
2666                         } elseif ( $found == 'close' ) {
2667                                 # lets check if it is enough characters for closing brace
2668                                 $maxCount = $openingBraceStack[$lastOpeningBrace]['count'];
2669                                 $count = strspn( $text, $text[$i], $i, $maxCount );
2670
2671                                 # check for maximum matching characters (if there are 5 closing
2672                                 # characters, we will probably need only 3 - depending on the rules)
2673                                 $matchingCount = 0;
2674                                 $matchingCallback = null;
2675                                 $cbType = $callbacks[$openingBraceStack[$lastOpeningBrace]['brace']];
2676                                 if ( $count > $cbType['max'] ) {
2677                                         # The specified maximum exists in the callback array, unless the caller
2678                                         # has made an error
2679                                         $matchingCount = $cbType['max'];
2680                                 } else {
2681                                         # Count is less than the maximum
2682                                         # Skip any gaps in the callback array to find the true largest match
2683                                         # Need to use array_key_exists not isset because the callback can be null
2684                                         $matchingCount = $count;
2685                                         while ( $matchingCount > 0 && !array_key_exists( $matchingCount, $cbType['cb'] ) ) {
2686                                                 --$matchingCount;
2687                                         }
2688                                 }
2689
2690                                 if ($matchingCount <= 0) {
2691                                         $i += $count;
2692                                         continue;
2693                                 }
2694                                 $matchingCallback = $cbType['cb'][$matchingCount];
2695
2696                                 # let's set a title or last part (if '|' was found)
2697                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2698                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2699                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2700                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2701                                 } else {
2702                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2703                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2704                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2705                                 }
2706
2707                                 $pieceStart = $openingBraceStack[$lastOpeningBrace]['startAt'] - $matchingCount;
2708                                 $pieceEnd = $i + $matchingCount;
2709
2710                                 if( is_callable( $matchingCallback ) ) {
2711                                         $cbArgs = array (
2712                                                                          'text' => substr($text, $pieceStart, $pieceEnd - $pieceStart),
2713                                                                          'title' => trim($openingBraceStack[$lastOpeningBrace]['title']),
2714                                                                          'parts' => $openingBraceStack[$lastOpeningBrace]['parts'],
2715                                                                          'lineStart' => (($pieceStart > 0) && ($text[$pieceStart-1] == "\n")),
2716                                                                          );
2717                                         # finally we can call a user callback and replace piece of text
2718                                         $replaceWith = call_user_func( $matchingCallback, $cbArgs );
2719                                         $text = substr($text, 0, $pieceStart) . $replaceWith . substr($text, $pieceEnd);
2720                                         $i = $pieceStart + strlen($replaceWith);
2721                                 } else {
2722                                         # null value for callback means that parentheses should be parsed, but not replaced
2723                                         $i += $matchingCount;
2724                                 }
2725
2726                                 # reset last opening parentheses, but keep it in case there are unused characters
2727                                 $piece = array('brace' => $openingBraceStack[$lastOpeningBrace]['brace'],
2728                                                            'braceEnd' => $openingBraceStack[$lastOpeningBrace]['braceEnd'],
2729                                                            'count' => $openingBraceStack[$lastOpeningBrace]['count'],
2730                                                            'title' => '',
2731                                                            'parts' => null,
2732                                                            'startAt' => $openingBraceStack[$lastOpeningBrace]['startAt']);
2733                                 $openingBraceStack[$lastOpeningBrace--] = null;
2734
2735                                 if ($matchingCount < $piece['count']) {
2736                                         $piece['count'] -= $matchingCount;
2737                                         $piece['startAt'] -= $matchingCount;
2738                                         $piece['partStart'] = $piece['startAt'];
2739                                         # do we still qualify for any callback with remaining count?
2740                                         $currentCbList = $callbacks[$piece['brace']]['cb'];
2741                                         while ( $piece['count'] ) {
2742                                                 if ( array_key_exists( $piece['count'], $currentCbList ) ) {
2743                                                         $lastOpeningBrace++;
2744                                                         $openingBraceStack[$lastOpeningBrace] = $piece;
2745                                                         break;
2746                                                 }
2747                                                 --$piece['count'];
2748                                         }
2749                                 }
2750                         } elseif ( $found == 'pipe' ) {
2751                                 # lets set a title if it is a first separator, or next part otherwise
2752                                 if (null === $openingBraceStack[$lastOpeningBrace]['parts']) {
2753                                         $openingBraceStack[$lastOpeningBrace]['title'] =
2754                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2755                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2756                                         $openingBraceStack[$lastOpeningBrace]['parts'] = array();
2757                                 } else {
2758                                         $openingBraceStack[$lastOpeningBrace]['parts'][] =
2759                                                 substr($text, $openingBraceStack[$lastOpeningBrace]['partStart'],
2760                                                 $i - $openingBraceStack[$lastOpeningBrace]['partStart']);
2761                                 }
2762                                 $openingBraceStack[$lastOpeningBrace]['partStart'] = ++$i;
2763                         }
2764                 }
2765
2766                 wfProfileOut( __METHOD__ );
2767                 return $text;
2768         }
2769
2770         /**
2771          * Replace magic variables, templates, and template arguments
2772          * with the appropriate text. Templates are substituted recursively,
2773          * taking care to avoid infinite loops.
2774          *
2775          * Note that the substitution depends on value of $mOutputType:
2776          *  OT_WIKI: only {{subst:}} templates
2777          *  OT_MSG: only magic variables
2778          *  OT_HTML: all templates and magic variables
2779          *
2780          * @param string $tex The text to transform
2781          * @param array $args Key-value pairs representing template parameters to substitute
2782          * @param bool $argsOnly Only do argument (triple-brace) expansion, not double-brace expansion
2783          * @private
2784          */
2785         function replaceVariables( $text, $args = array(), $argsOnly = false ) {
2786                 # Prevent too big inclusions
2787                 if( strlen( $text ) > $this->mOptions->getMaxIncludeSize() ) {
2788                         return $text;
2789                 }
2790
2791                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2792                 wfProfileIn( $fname );
2793
2794                 # This function is called recursively. To keep track of arguments we need a stack:
2795                 array_push( $this->mArgStack, $args );
2796
2797                 $braceCallbacks = array();
2798                 if ( !$argsOnly ) {
2799                         $braceCallbacks[2] = array( &$this, 'braceSubstitution' );
2800                 }
2801                 if ( $this->mOutputType != OT_MSG ) {
2802                         $braceCallbacks[3] = array( &$this, 'argSubstitution' );
2803                 }
2804                 if ( $braceCallbacks ) {
2805                         $callbacks = array(
2806                                 '{' => array(
2807                                         'end' => '}',
2808                                         'cb' => $braceCallbacks,
2809                                         'min' => $argsOnly ? 3 : 2,
2810                                         'max' => isset( $braceCallbacks[3] ) ? 3 : 2,
2811                                 ),
2812                                 '[' => array(
2813                                         'end' => ']',
2814                                         'cb' => array(2=>null),
2815                                         'min' => 2,
2816                                         'max' => 2,
2817                                 )
2818                         );
2819                         $text = $this->replace_callback ($text, $callbacks);
2820
2821                         array_pop( $this->mArgStack );
2822                 }
2823                 wfProfileOut( $fname );
2824                 return $text;
2825         }
2826
2827         /**
2828          * Replace magic variables
2829          * @private
2830          */
2831         function variableSubstitution( $matches ) {
2832                 global $wgContLang;
2833                 $fname = 'Parser::variableSubstitution';
2834                 $varname = $wgContLang->lc($matches[1]);
2835                 wfProfileIn( $fname );
2836                 $skip = false;
2837                 if ( $this->mOutputType == OT_WIKI ) {
2838                         # Do only magic variables prefixed by SUBST
2839                         $mwSubst =& MagicWord::get( 'subst' );
2840                         if (!$mwSubst->matchStartAndRemove( $varname ))
2841                                 $skip = true;
2842                         # Note that if we don't substitute the variable below,
2843                         # we don't remove the {{subst:}} magic word, in case
2844                         # it is a template rather than a magic variable.
2845                 }
2846                 if ( !$skip && array_key_exists( $varname, $this->mVariables ) ) {
2847                         $id = $this->mVariables[$varname];
2848                         # Now check if we did really match, case sensitive or not
2849                         $mw =& MagicWord::get( $id );
2850                         if ($mw->match($matches[1])) {
2851                                 $text = $this->getVariableValue( $id );
2852                                 $this->mOutput->mContainsOldMagic = true;
2853                         } else {
2854                                 $text = $matches[0];
2855                         }
2856                 } else {
2857                         $text = $matches[0];
2858                 }
2859                 wfProfileOut( $fname );
2860                 return $text;
2861         }
2862
2863
2864         /// Clean up argument array - refactored in 1.9 so parserfunctions can use it, too.
2865         static function createAssocArgs( $args ) {
2866                 $assocArgs = array();
2867                 $index = 1;
2868                 foreach( $args as $arg ) {
2869                         $eqpos = strpos( $arg, '=' );
2870                         if ( $eqpos === false ) {
2871                                 $assocArgs[$index++] = $arg;
2872                         } else {
2873                                 $name = trim( substr( $arg, 0, $eqpos ) );
2874                                 $value = trim( substr( $arg, $eqpos+1 ) );
2875                                 if ( $value === false ) {
2876                                         $value = '';
2877                                 }
2878                                 if ( $name !== false ) {
2879                                         $assocArgs[$name] = $value;
2880                                 }
2881                         }
2882                 }
2883
2884                 return $assocArgs;
2885         }
2886
2887         /**
2888          * Return the text of a template, after recursively
2889          * replacing any variables or templates within the template.
2890          *
2891          * @param array $piece The parts of the template
2892          *  $piece['text']: matched text
2893          *  $piece['title']: the title, i.e. the part before the |
2894          *  $piece['parts']: the parameter array
2895          * @return string the text of the template
2896          * @private
2897          */
2898         function braceSubstitution( $piece ) {
2899                 global $wgContLang, $wgLang, $wgAllowDisplayTitle, $wgNonincludableNamespaces;
2900                 $fname = __METHOD__ /*. '-L' . count( $this->mArgStack )*/;
2901                 wfProfileIn( $fname );
2902                 wfProfileIn( __METHOD__.'-setup' );
2903
2904                 # Flags
2905                 $found = false;             # $text has been filled
2906                 $nowiki = false;            # wiki markup in $text should be escaped
2907                 $noparse = false;           # Unsafe HTML tags should not be stripped, etc.
2908                 $noargs = false;            # Don't replace triple-brace arguments in $text
2909                 $replaceHeadings = false;   # Make the edit section links go to the template not the article
2910                 $headingOffset = 0;         # Skip headings when number, to account for those that weren't transcluded.
2911                 $isHTML = false;            # $text is HTML, armour it against wikitext transformation
2912                 $forceRawInterwiki = false; # Force interwiki transclusion to be done in raw mode not rendered
2913
2914                 # Title object, where $text came from
2915                 $title = NULL;
2916
2917                 $linestart = '';
2918
2919
2920                 # $part1 is the bit before the first |, and must contain only title characters
2921                 # $args is a list of arguments, starting from index 0, not including $part1
2922
2923                 $titleText = $part1 = $piece['title'];
2924                 # If the third subpattern matched anything, it will start with |
2925
2926                 if (null == $piece['parts']) {
2927                         $replaceWith = $this->variableSubstitution (array ($piece['text'], $piece['title']));
2928                         if ($replaceWith != $piece['text']) {
2929                                 $text = $replaceWith;
2930                                 $found = true;
2931                                 $noparse = true;
2932                                 $noargs = true;
2933                         }
2934                 }
2935
2936                 $args = (null == $piece['parts']) ? array() : $piece['parts'];
2937                 wfProfileOut( __METHOD__.'-setup' );
2938
2939                 # SUBST
2940                 wfProfileIn( __METHOD__.'-modifiers' );
2941                 if ( !$found ) {
2942                         $mwSubst =& MagicWord::get( 'subst' );
2943                         if ( $mwSubst->matchStartAndRemove( $part1 ) xor $this->ot['wiki'] ) {
2944                                 # One of two possibilities is true:
2945                                 # 1) Found SUBST but not in the PST phase
2946                                 # 2) Didn't find SUBST and in the PST phase
2947                                 # In either case, return without further processing
2948                                 $text = $piece['text'];
2949                                 $found = true;
2950                                 $noparse = true;
2951                                 $noargs = true;
2952                         }
2953                 }
2954
2955                 # MSG, MSGNW and RAW
2956                 if ( !$found ) {
2957                         # Check for MSGNW:
2958                         $mwMsgnw =& MagicWord::get( 'msgnw' );
2959                         if ( $mwMsgnw->matchStartAndRemove( $part1 ) ) {
2960                                 $nowiki = true;
2961                         } else {
2962                                 # Remove obsolete MSG:
2963                                 $mwMsg =& MagicWord::get( 'msg' );
2964                                 $mwMsg->matchStartAndRemove( $part1 );
2965                         }
2966
2967                         # Check for RAW:
2968                         $mwRaw =& MagicWord::get( 'raw' );
2969                         if ( $mwRaw->matchStartAndRemove( $part1 ) ) {
2970                                 $forceRawInterwiki = true;
2971                         }
2972                 }
2973                 wfProfileOut( __METHOD__.'-modifiers' );
2974
2975                 //save path level before recursing into functions & templates.
2976                 $lastPathLevel = $this->mTemplatePath;
2977
2978                 # Parser functions
2979                 if ( !$found ) {
2980                         wfProfileIn( __METHOD__ . '-pfunc' );
2981
2982                         $colonPos = strpos( $part1, ':' );
2983                         if ( $colonPos !== false ) {
2984                                 # Case sensitive functions
2985                                 $function = substr( $part1, 0, $colonPos );
2986                                 if ( isset( $this->mFunctionSynonyms[1][$function] ) ) {
2987                                         $function = $this->mFunctionSynonyms[1][$function];
2988                                 } else {
2989                                         # Case insensitive functions
2990                                         $function = strtolower( $function );
2991                                         if ( isset( $this->mFunctionSynonyms[0][$function] ) ) {
2992                                                 $function = $this->mFunctionSynonyms[0][$function];
2993                                         } else {
2994                                                 $function = false;
2995                                         }
2996                                 }
2997                                 if ( $function ) {
2998                                         $funcArgs = array_map( 'trim', $args );
2999                                         $funcArgs = array_merge( array( &$this, trim( substr( $part1, $colonPos + 1 ) ) ), $funcArgs );
3000                                         $result = call_user_func_array( $this->mFunctionHooks[$function], $funcArgs );
3001                                         $found = true;
3002
3003                                         // The text is usually already parsed, doesn't need triple-brace tags expanded, etc.
3004                                         //$noargs = true;
3005                                         //$noparse = true;
3006
3007                                         if ( is_array( $result ) ) {
3008                                                 if ( isset( $result[0] ) ) {
3009                                                         $text = $linestart . $result[0];
3010                                                         unset( $result[0] );
3011                                                 }
3012
3013                                                 // Extract flags into the local scope
3014                                                 // This allows callers to set flags such as nowiki, noparse, found, etc.
3015                                                 extract( $result );
3016                                         } else {
3017                                                 $text = $linestart . $result;
3018                                         }
3019                                 }
3020                         }
3021                         wfProfileOut( __METHOD__ . '-pfunc' );
3022                 }
3023
3024                 # Template table test
3025
3026                 # Did we encounter this template already? If yes, it is in the cache
3027                 # and we need to check for loops.
3028                 if ( !$found && isset( $this->mTemplates[$piece['title']] ) ) {
3029                         $found = true;
3030
3031                         # Infinite loop test
3032                         if ( isset( $this->mTemplatePath[$part1] ) ) {
3033                                 $noparse = true;
3034                                 $noargs = true;
3035                                 $found = true;
3036                                 $text = $linestart .
3037                                         "[[$part1]]<!-- WARNING: template loop detected -->";
3038                                 wfDebug( __METHOD__.": template loop broken at '$part1'\n" );
3039                         } else {
3040                                 # set $text to cached message.
3041                                 $text = $linestart . $this->mTemplates[$piece['title']];
3042                                 #treat title for cached page the same as others
3043                                 $ns = NS_TEMPLATE;
3044                                 $subpage = '';
3045                                 $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3046                                 if ($subpage !== '') {
3047                                   $ns = $this->mTitle->getNamespace();
3048                                 }
3049                                 $title = Title::newFromText( $part1, $ns );
3050                                 //used by include size checking
3051                                 $titleText = $title->getPrefixedText();
3052                                 //used by edit section links
3053                                 $replaceHeadings = true;
3054
3055                         }
3056                 }
3057
3058                 # Load from database
3059                 if ( !$found ) {
3060                         wfProfileIn( __METHOD__ . '-loadtpl' );
3061                         $ns = NS_TEMPLATE;
3062                         # declaring $subpage directly in the function call
3063                         # does not work correctly with references and breaks
3064                         # {{/subpage}}-style inclusions
3065                         $subpage = '';
3066                         $part1 = $this->maybeDoSubpageLink( $part1, $subpage );
3067                         if ($subpage !== '') {
3068                                 $ns = $this->mTitle->getNamespace();
3069                         }
3070                         $title = Title::newFromText( $part1, $ns );
3071
3072
3073                         if ( !is_null( $title ) ) {
3074                                 $titleText = $title->getPrefixedText();
3075                                 # Check for language variants if the template is not found
3076                                 if($wgContLang->hasVariants() && $title->getArticleID() == 0){
3077                                         $wgContLang->findVariantLink($part1, $title);
3078                                 }
3079
3080                                 if ( !$title->isExternal() ) {
3081                                         if ( $title->getNamespace() == NS_SPECIAL && $this->mOptions->getAllowSpecialInclusion() && $this->ot['html'] ) {
3082                                                 $text = SpecialPage::capturePath( $title );
3083                                                 if ( is_string( $text ) ) {
3084                                                         $found = true;
3085                                                         $noparse = true;
3086                                                         $noargs = true;
3087                                                         $isHTML = true;
3088                                                         $this->disableCache();
3089                                                 }
3090                                         } else if ( $wgNonincludableNamespaces && in_array( $title->getNamespace(), $wgNonincludableNamespaces ) ) {
3091                                                 $found = false; //access denied
3092                                                 wfDebug( "$fname: template inclusion denied for " . $title->getPrefixedDBkey() );
3093                                         } else {
3094                                                 $articleContent = $this->fetchTemplate( $title );
3095                                                 if ( $articleContent !== false ) {
3096                                                         $found = true;
3097                                                         $text = $articleContent;
3098                                                         $replaceHeadings = true;
3099                                                 }
3100                                         }
3101
3102                                         # If the title is valid but undisplayable, make a link to it
3103                                         if ( !$found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3104                                                 $text = "[[:$titleText]]";
3105                                                 $found = true;
3106                                         }
3107                                 } elseif ( $title->isTrans() ) {
3108                                         // Interwiki transclusion
3109                                         if ( $this->ot['html'] && !$forceRawInterwiki ) {
3110                                                 $text = $this->interwikiTransclude( $title, 'render' );
3111                                                 $isHTML = true;
3112                                                 $noparse = true;
3113                                         } else {
3114                                                 $text = $this->interwikiTransclude( $title, 'raw' );
3115                                                 $replaceHeadings = true;
3116                                         }
3117                                         $found = true;
3118                                 }
3119
3120                                 # Template cache array insertion
3121                                 # Use the original $piece['title'] not the mangled $part1, so that
3122                                 # modifiers such as RAW: produce separate cache entries
3123                                 if( $found ) {
3124                                         if( $isHTML ) {
3125                                                 // A special page; don't store it in the template cache.
3126                                         } else {
3127                                                 $this->mTemplates[$piece['title']] = $text;
3128                                         }
3129                                         $text = $linestart . $text;
3130                                 }
3131                         }
3132                         wfProfileOut( __METHOD__ . '-loadtpl' );
3133                 }
3134
3135                 if ( $found && !$this->incrementIncludeSize( 'pre-expand', strlen( $text ) ) ) {
3136                         # Error, oversize inclusion
3137                         $text = $linestart .
3138                                 "[[$titleText]]<!-- WARNING: template omitted, pre-expand include size too large -->";
3139                         $noparse = true;
3140                         $noargs = true;
3141                 }
3142
3143                 # Recursive parsing, escaping and link table handling
3144                 # Only for HTML output
3145                 if ( $nowiki && $found && ( $this->ot['html'] || $this->ot['pre'] ) ) {
3146                         $text = wfEscapeWikiText( $text );
3147                 } elseif ( !$this->ot['msg'] && $found ) {
3148                         if ( $noargs ) {
3149                                 $assocArgs = array();
3150                         } else {
3151                                 # Clean up argument array
3152                                 $assocArgs = self::createAssocArgs($args);
3153                                 # Add a new element to the templace recursion path
3154                                 $this->mTemplatePath[$part1] = 1;
3155                         }
3156
3157                         if ( !$noparse ) {
3158                                 # If there are any <onlyinclude> tags, only include them
3159                                 if ( in_string( '<onlyinclude>', $text ) && in_string( '</onlyinclude>', $text ) ) {
3160                                         $replacer = new OnlyIncludeReplacer;
3161                                         StringUtils::delimiterReplaceCallback( '<onlyinclude>', '</onlyinclude>',
3162                                                 array( &$replacer, 'replace' ), $text );
3163                                         $text = $replacer->output;
3164                                 }
3165                                 # Remove <noinclude> sections and <includeonly> tags
3166                                 $text = StringUtils::delimiterReplace( '<noinclude>', '</noinclude>', '', $text );
3167                                 $text = strtr( $text, array( '<includeonly>' => '' , '</includeonly>' => '' ) );
3168
3169                                 if( $this->ot['html'] || $this->ot['pre'] ) {
3170                                         # Strip <nowiki>, <pre>, etc.
3171                                         $text = $this->strip( $text, $this->mStripState );
3172                                         if ( $this->ot['html'] ) {
3173                                                 $text = Sanitizer::removeHTMLtags( $text, array( &$this, 'replaceVariables' ), $assocArgs );
3174                                         } elseif ( $this->ot['pre'] && $this->mOptions->getRemoveComments() ) {
3175                                                 $text = Sanitizer::removeHTMLcomments( $text );
3176                                         }
3177                                 }
3178                                 $text = $this->replaceVariables( $text, $assocArgs );
3179
3180                                 # If the template begins with a table or block-level
3181                                 # element, it should be treated as beginning a new line.
3182                                 if (!$piece['lineStart'] && preg_match('/^(?:{\\||:|;|#|\*)/', $text)) /*}*/{
3183                                         $text = "\n" . $text;
3184                                 }
3185                         } elseif ( !$noargs ) {
3186                                 # $noparse and !$noargs
3187                                 # Just replace the arguments, not any double-brace items
3188                                 # This is used for rendered interwiki transclusion
3189                                 $text = $this->replaceVariables( $text, $assocArgs, true );
3190                         }
3191                 }
3192                 # Prune lower levels off the recursion check path
3193                 $this->mTemplatePath = $lastPathLevel;
3194
3195                 if ( $found && !$this->incrementIncludeSize( 'post-expand', strlen( $text ) ) ) {
3196                         # Error, oversize inclusion
3197                         $text = $linestart .
3198                                 "[[$titleText]]<!-- WARNING: template omitted, post-expand include size too large -->";
3199                         $noparse = true;
3200                         $noargs = true;
3201                 }
3202
3203                 if ( !$found ) {
3204                         wfProfileOut( $fname );
3205                         return $piece['text'];
3206                 } else {
3207                         wfProfileIn( __METHOD__ . '-placeholders' );
3208                         if ( $isHTML ) {
3209                                 # Replace raw HTML by a placeholder
3210                                 # Add a blank line preceding, to prevent it from mucking up
3211                                 # immediately preceding headings
3212                                 $text = "\n\n" . $this->insertStripItem( $text, $this->mStripState );
3213                         } else {
3214                                 # replace ==section headers==
3215                                 # XXX this needs to go away once we have a better parser.
3216                                 if ( !$this->ot['wiki'] && !$this->ot['pre'] && $replaceHeadings ) {
3217                                         if( !is_null( $title ) )
3218                                                 $encodedname = base64_encode($title->getPrefixedDBkey());
3219                                         else
3220                                                 $encodedname = base64_encode("");
3221                                         $m = preg_split('/(^={1,6}.*?={1,6}\s*?$)/m', $text, -1,
3222                                                 PREG_SPLIT_DELIM_CAPTURE);
3223                                         $text = '';
3224                                         $nsec = $headingOffset;
3225                                         for( $i = 0; $i < count($m); $i += 2 ) {
3226                                                 $text .= $m[$i];
3227                                                 if (!isset($m[$i + 1]) || $m[$i + 1] == "") continue;
3228                                                 $hl = $m[$i + 1];
3229                                                 if( strstr($hl, "<!--MWTEMPLATESECTION") ) {
3230                                                         $text .= $hl;
3231                                                         continue;
3232                                                 }
3233                                                 $m2 = array();
3234                                                 preg_match('/^(={1,6})(.*?)(={1,6})\s*?$/m', $hl, $m2);
3235                                                 $text .= $m2[1] . $m2[2] . "<!--MWTEMPLATESECTION="
3236                                                         . $encodedname . "&" . base64_encode("$nsec") . "-->" . $m2[3];
3237
3238                                                 $nsec++;
3239                                         }
3240                                 }
3241                         }
3242                         wfProfileOut( __METHOD__ . '-placeholders' );
3243                 }
3244
3245                 # Prune lower levels off the recursion check path
3246                 $this->mTemplatePath = $lastPathLevel;
3247
3248                 if ( !$found ) {
3249                         wfProfileOut( $fname );
3250                         return $piece['text'];
3251                 } else {
3252                         wfProfileOut( $fname );
3253                         return $text;
3254                 }
3255         }
3256
3257         /**
3258          * Fetch the unparsed text of a template and register a reference to it.
3259          */
3260         function fetchTemplate( $title ) {
3261                 $text = false;
3262                 // Loop to fetch the article, with up to 1 redirect
3263                 for ( $i = 0; $i < 2 && is_object( $title ); $i++ ) {
3264                         $rev = Revision::newFromTitle( $title );
3265                         $this->mOutput->addTemplate( $title, $title->getArticleID() );
3266                         if ( $rev ) {
3267                                 $text = $rev->getText();
3268                         } elseif( $title->getNamespace() == NS_MEDIAWIKI ) {
3269                                 global $wgLang;
3270                                 $message = $wgLang->lcfirst( $title->getText() );
3271                                 $text = wfMsgForContentNoTrans( $message );
3272                                 if( wfEmptyMsg( $message, $text ) ) {
3273                                         $text = false;
3274                                         break;
3275                                 }
3276                         } else {
3277                                 break;
3278                         }
3279                         if ( $text === false ) {
3280                                 break;
3281                         }
3282                         // Redirect?
3283                         $title = Title::newFromRedirect( $text );
3284                 }
3285                 return $text;
3286         }
3287
3288         /**
3289          * Transclude an interwiki link.
3290          */
3291         function interwikiTransclude( $title, $action ) {
3292                 global $wgEnableScaryTranscluding;
3293
3294                 if (!$wgEnableScaryTranscluding)
3295                         return wfMsg('scarytranscludedisabled');
3296
3297                 $url = $title->getFullUrl( "action=$action" );
3298
3299                 if (strlen($url) > 255)
3300                         return wfMsg('scarytranscludetoolong');
3301                 return $this->fetchScaryTemplateMaybeFromCache($url);
3302         }
3303
3304         function fetchScaryTemplateMaybeFromCache($url) {
3305                 global $wgTranscludeCacheExpiry;
3306                 $dbr = wfGetDB(DB_SLAVE);
3307                 $obj = $dbr->selectRow('transcache', array('tc_time', 'tc_contents'),
3308                                 array('tc_url' => $url));
3309                 if ($obj) {
3310                         $time = $obj->tc_time;
3311                         $text = $obj->tc_contents;
3312                         if ($time && time() < $time + $wgTranscludeCacheExpiry ) {
3313                                 return $text;
3314                         }
3315                 }
3316
3317                 $text = Http::get($url);
3318                 if (!$text)
3319                         return wfMsg('scarytranscludefailed', $url);
3320
3321                 $dbw = wfGetDB(DB_MASTER);
3322                 $dbw->replace('transcache', array('tc_url'), array(
3323                         'tc_url' => $url,
3324                         'tc_time' => time(),
3325                         'tc_contents' => $text));
3326                 return $text;
3327         }
3328
3329
3330         /**
3331          * Triple brace replacement -- used for template arguments
3332          * @private
3333          */
3334         function argSubstitution( $matches ) {
3335                 $arg = trim( $matches['title'] );
3336                 $text = $matches['text'];
3337                 $inputArgs = end( $this->mArgStack );
3338
3339                 if ( array_key_exists( $arg, $inputArgs ) ) {
3340                         $text = $inputArgs[$arg];
3341                 } else if (($this->mOutputType == OT_HTML || $this->mOutputType == OT_PREPROCESS ) &&
3342                 null != $matches['parts'] && count($matches['parts']) > 0) {
3343                         $text = $matches['parts'][0];
3344                 }
3345                 if ( !$this->incrementIncludeSize( 'arg', strlen( $text ) ) ) {
3346                         $text = $matches['text'] .
3347                                 '<!-- WARNING: argument omitted, expansion size too large -->';
3348                 }
3349
3350                 return $text;
3351         }
3352
3353         /**
3354          * Increment an include size counter
3355          *
3356          * @param string $type The type of expansion
3357          * @param integer $size The size of the text
3358          * @return boolean False if this inclusion would take it over the maximum, true otherwise
3359          */
3360         function incrementIncludeSize( $type, $size ) {
3361                 if ( $this->mIncludeSizes[$type] + $size > $this->mOptions->getMaxIncludeSize() ) {
3362                         return false;
3363                 } else {
3364                         $this->mIncludeSizes[$type] += $size;
3365                         return true;
3366                 }
3367         }
3368
3369         /**
3370          * Detect __NOGALLERY__ magic word and set a placeholder
3371          */
3372         function stripNoGallery( &$text ) {
3373                 # if the string __NOGALLERY__ (not case-sensitive) occurs in the HTML,
3374                 # do not add TOC
3375                 $mw = MagicWord::get( 'nogallery' );
3376                 $this->mOutput->mNoGallery = $mw->matchAndRemove( $text ) ;
3377         }
3378
3379         /**
3380          * Detect __TOC__ magic word and set a placeholder
3381          */
3382         function stripToc( $text ) {
3383                 # if the string __NOTOC__ (not case-sensitive) occurs in the HTML,
3384                 # do not add TOC
3385                 $mw = MagicWord::get( 'notoc' );
3386                 if( $mw->matchAndRemove( $text ) ) {
3387                         $this->mShowToc = false;
3388                 }
3389
3390                 $mw = MagicWord::get( 'toc' );
3391                 if( $mw->match( $text ) ) {
3392                         $this->mShowToc = true;
3393                         $this->mForceTocPosition = true;
3394
3395                         // Set a placeholder. At the end we'll fill it in with the TOC.
3396                         $text = $mw->replace( '<!--MWTOC-->', $text, 1 );
3397
3398                         // Only keep the first one.
3399                         $text = $mw->replace( '', $text );
3400                 }
3401                 return $text;
3402         }
3403
3404         /**
3405          * This function accomplishes several tasks:
3406          * 1) Auto-number headings if that option is enabled
3407          * 2) Add an [edit] link to sections for logged in users who have enabled the option
3408          * 3) Add a Table of contents on the top for users who have enabled the option
3409          * 4) Auto-anchor headings
3410          *
3411          * It loops through all headlines, collects the necessary data, then splits up the
3412          * string and re-inserts the newly formatted headlines.
3413          *
3414          * @param string $text
3415          * @param boolean $isMain
3416          * @private
3417          */
3418         function formatHeadings( $text, $isMain=true ) {
3419                 global $wgMaxTocLevel, $wgContLang;
3420
3421                 $doNumberHeadings = $this->mOptions->getNumberHeadings();
3422                 if( !$this->mTitle->quickUserCan( 'edit' ) ) {
3423                         $showEditLink = 0;
3424                 } else {
3425                         $showEditLink = $this->mOptions->getEditSection();
3426                 }
3427
3428                 # Inhibit editsection links if requested in the page
3429                 $esw =& MagicWord::get( 'noeditsection' );
3430                 if( $esw->matchAndRemove( $text ) ) {
3431                         $showEditLink = 0;
3432                 }
3433
3434                 # Get all headlines for numbering them and adding funky stuff like [edit]
3435                 # links - this is for later, but we need the number of headlines right now
3436                 $matches = array();
3437                 $numMatches = preg_match_all( '/<H(?P<level>[1-6])(?P<attrib>.*?'.'>)(?P<header>.*?)<\/H[1-6] *>/i', $text, $matches );
3438
3439                 # if there are fewer than 4 headlines in the article, do not show TOC
3440                 # unless it's been explicitly enabled.
3441                 $enoughToc = $this->mShowToc &&
3442                         (($numMatches >= 4) || $this->mForceTocPosition);
3443
3444                 # Allow user to stipulate that a page should have a "new section"
3445                 # link added via __NEWSECTIONLINK__
3446                 $mw =& MagicWord::get( 'newsectionlink' );
3447                 if( $mw->matchAndRemove( $text ) )
3448                         $this->mOutput->setNewSection( true );
3449
3450                 # if the string __FORCETOC__ (not case-sensitive) occurs in the HTML,
3451                 # override above conditions and always show TOC above first header
3452                 $mw =& MagicWord::get( 'forcetoc' );
3453                 if ($mw->matchAndRemove( $text ) ) {
3454                         $this->mShowToc = true;
3455                         $enoughToc = true;
3456                 }
3457
3458                 # Never ever show TOC if no headers
3459                 if( $numMatches < 1 ) {
3460                         $enoughToc = false;
3461                 }
3462
3463                 # We need this to perform operations on the HTML
3464                 $sk = $this->mOptions->getSkin();
3465
3466                 # headline counter
3467                 $headlineCount = 0;
3468                 $sectionCount = 0; # headlineCount excluding template sections
3469
3470                 # Ugh .. the TOC should have neat indentation levels which can be
3471                 # passed to the skin functions. These are determined here
3472                 $toc = '';
3473                 $full = '';
3474                 $head = array();
3475                 $sublevelCount = array();
3476                 $levelCount = array();
3477                 $toclevel = 0;
3478                 $level = 0;
3479                 $prevlevel = 0;
3480                 $toclevel = 0;
3481                 $prevtoclevel = 0;
3482
3483                 foreach( $matches[3] as $headline ) {
3484                         $istemplate = 0;
3485                         $templatetitle = '';
3486                         $templatesection = 0;
3487                         $numbering = '';
3488                         $mat = array();
3489                         if (preg_match("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", $headline, $mat)) {
3490                                 $istemplate = 1;
3491                                 $templatetitle = base64_decode($mat[1]);
3492                                 $templatesection = 1 + (int)base64_decode($mat[2]);
3493                                 $headline = preg_replace("/<!--MWTEMPLATESECTION=([^&]+)&([^_]+)-->/", "", $headline);
3494                         }
3495
3496                         if( $toclevel ) {
3497                                 $prevlevel = $level;
3498                                 $prevtoclevel = $toclevel;
3499                         }
3500                         $level = $matches[1][$headlineCount];
3501
3502                         if( $doNumberHeadings || $enoughToc ) {
3503
3504                                 if ( $level > $prevlevel ) {
3505                                         # Increase TOC level
3506                                         $toclevel++;
3507                                         $sublevelCount[$toclevel] = 0;
3508                                         if( $toclevel<$wgMaxTocLevel ) {
3509                                                 $toc .= $sk->tocIndent();
3510                                         }
3511                                 }
3512                                 elseif ( $level < $prevlevel && $toclevel > 1 ) {
3513                                         # Decrease TOC level, find level to jump to
3514
3515                                         if ( $toclevel == 2 && $level <= $levelCount[1] ) {
3516                                                 # Can only go down to level 1
3517                                                 $toclevel = 1;
3518                                         } else {
3519                                                 for ($i = $toclevel; $i > 0; $i--) {
3520                                                         if ( $levelCount[$i] == $level ) {
3521                                                                 # Found last matching level
3522                                                                 $toclevel = $i;
3523                                                                 break;
3524                                                         }
3525                                                         elseif ( $levelCount[$i] < $level ) {
3526                                                                 # Found first matching level below current level
3527                                                                 $toclevel = $i + 1;
3528                                                                 break;
3529                                                         }
3530                                                 }
3531                                         }
3532                                         if( $toclevel<$wgMaxTocLevel ) {
3533                                                 $toc .= $sk->tocUnindent( $prevtoclevel - $toclevel );
3534                                         }
3535                                 }
3536                                 else {
3537                                         # No change in level, end TOC line
3538                                         if( $toclevel<$wgMaxTocLevel ) {
3539                                                 $toc .= $sk->tocLineEnd();
3540                                         }
3541                                 }
3542
3543                                 $levelCount[$toclevel] = $level;
3544
3545                                 # count number of headlines for each level
3546                                 @$sublevelCount[$toclevel]++;
3547                                 $dot = 0;
3548                                 for( $i = 1; $i <= $toclevel; $i++ ) {
3549                                         if( !empty( $sublevelCount[$i] ) ) {
3550                                                 if( $dot ) {
3551                                                         $numbering .= '.';
3552                                                 }
3553                                                 $numbering .= $wgContLang->formatNum( $sublevelCount[$i] );
3554                                                 $dot = 1;
3555                                         }
3556                                 }
3557                         }
3558
3559                         # The canonized header is a version of the header text safe to use for links
3560                         # Avoid insertion of weird stuff like <math> by expanding the relevant sections
3561                         $canonized_headline = $this->mStripState->unstripBoth( $headline );
3562
3563                         # Remove link placeholders by the link text.
3564                         #     <!--LINK number-->
3565                         # turns into
3566                         #     link text with suffix
3567                         $canonized_headline = preg_replace( '/<!--LINK ([0-9]*)-->/e',
3568                                                             "\$this->mLinkHolders['texts'][\$1]",
3569                                                             $canonized_headline );
3570                         $canonized_headline = preg_replace( '/<!--IWLINK ([0-9]*)-->/e',
3571                                                             "\$this->mInterwikiLinkHolders['texts'][\$1]",
3572                                                             $canonized_headline );
3573
3574                         # strip out HTML
3575                         $canonized_headline = preg_replace( '/<.*?' . '>/','',$canonized_headline );
3576                         $tocline = trim( $canonized_headline );
3577                         # Save headline for section edit hint before it's escaped
3578                         $headline_hint = trim( $canonized_headline );
3579                         $canonized_headline = Sanitizer::escapeId( $tocline );
3580                         $refers[$headlineCount] = $canonized_headline;
3581
3582                         # count how many in assoc. array so we can track dupes in anchors
3583                         isset( $refers[$canonized_headline] ) ? $refers[$canonized_headline]++ : $refers[$canonized_headline] = 1;
3584                         $refcount[$headlineCount]=$refers[$canonized_headline];
3585
3586                         # Don't number the heading if it is the only one (looks silly)
3587                         if( $doNumberHeadings && count( $matches[3] ) > 1) {
3588                                 # the two are different if the line contains a link
3589                                 $headline=$numbering . ' ' . $headline;
3590                         }
3591
3592                         # Create the anchor for linking from the TOC to the section
3593                         $anchor = $canonized_headline;
3594                         if($refcount[$headlineCount] > 1 ) {
3595                                 $anchor .= '_' . $refcount[$headlineCount];
3596                         }
3597                         if( $enoughToc && ( !isset($wgMaxTocLevel) || $toclevel<$wgMaxTocLevel ) ) {
3598                                 $toc .= $sk->tocLine($anchor, $tocline, $numbering, $toclevel);
3599                         }
3600                         # give headline the correct <h#> tag
3601                         if( $showEditLink && ( !$istemplate || $templatetitle !== "" ) ) {
3602                                 if( $istemplate )
3603                                         $editlink = $sk->editSectionLinkForOther($templatetitle, $templatesection);
3604                                 else
3605                                         $editlink = $sk->editSectionLink($this->mTitle, $sectionCount+1, $headline_hint);
3606                         } else {
3607                                 $editlink = '';
3608                         }
3609                         $head[$headlineCount] = $sk->makeHeadline( $level, $matches['attrib'][$headlineCount], $anchor, $headline, $editlink );
3610
3611                         $headlineCount++;
3612                         if( !$istemplate )
3613                                 $sectionCount++;
3614                 }
3615
3616                 if( $enoughToc ) {
3617                         if( $toclevel<$wgMaxTocLevel ) {
3618                                 $toc .= $sk->tocUnindent( $toclevel - 1 );
3619                         }
3620                         $toc = $sk->tocList( $toc );
3621                 }
3622
3623                 # split up and insert constructed headlines
3624
3625                 $blocks = preg_split( '/<H[1-6].*?' . '>.*?<\/H[1-6]>/i', $text );
3626                 $i = 0;
3627
3628                 foreach( $blocks as $block ) {
3629                         if( $showEditLink && $headlineCount > 0 && $i == 0 && $block != "\n" ) {
3630                                 # This is the [edit] link that appears for the top block of text when
3631                                 # section editing is enabled
3632
3633                                 # Disabled because it broke block formatting
3634                                 # For example, a bullet point in the top line
3635                                 # $full .= $sk->editSectionLink(0);
3636                         }
3637                         $full .= $block;
3638                         if( $enoughToc && !$i && $isMain && !$this->mForceTocPosition ) {
3639                                 # Top anchor now in skin
3640                                 $full = $full.$toc;
3641                         }
3642
3643                         if( !empty( $head[$i] ) ) {
3644                                 $full .= $head[$i];
3645                         }
3646                         $i++;
3647                 }
3648                 if( $this->mForceTocPosition ) {
3649                         return str_replace( '<!--MWTOC-->', $toc, $full );
3650                 } else {
3651                         return $full;
3652                 }
3653         }
3654
3655         /**
3656          * Transform wiki markup when saving a page by doing \r\n -> \n
3657          * conversion, substitting signatures, {{subst:}} templates, etc.
3658          *
3659          * @param string $text the text to transform
3660          * @param Title &$title the Title object for the current article
3661          * @param User &$user the User object describing the current user
3662          * @param ParserOptions $options parsing options
3663          * @param bool $clearState whether to clear the parser state first
3664          * @return string the altered wiki markup
3665          * @public
3666          */
3667         function preSaveTransform( $text, &$title, $user, $options, $clearState = true ) {
3668                 $this->mOptions = $options;
3669                 $this->mTitle =& $title;
3670                 $this->setOutputType( OT_WIKI );
3671
3672                 if ( $clearState ) {
3673                         $this->clearState();
3674                 }
3675
3676                 $stripState = new StripState;
3677                 $pairs = array(
3678                         "\r\n" => "\n",
3679                 );
3680                 $text = str_replace( array_keys( $pairs ), array_values( $pairs ), $text );
3681                 $text = $this->strip( $text, $stripState, true, array( 'gallery' ) );
3682                 $text = $this->pstPass2( $text, $stripState, $user );
3683                 $text = $stripState->unstripBoth( $text );
3684                 return $text;
3685         }
3686
3687         /**
3688          * Pre-save transform helper function
3689          * @private
3690          */
3691         function pstPass2( $text, &$stripState, $user ) {
3692                 global $wgContLang, $wgLocaltimezone;
3693
3694                 /* Note: This is the timestamp saved as hardcoded wikitext to
3695                  * the database, we use $wgContLang here in order to give
3696                  * everyone the same signature and use the default one rather
3697                  * than the one selected in each user's preferences.
3698                  */
3699                 if ( isset( $wgLocaltimezone ) ) {
3700                         $oldtz = getenv( 'TZ' );
3701                         putenv( 'TZ='.$wgLocaltimezone );
3702                 }
3703                 $d = $wgContLang->timeanddate( date( 'YmdHis' ), false, false) .
3704                   ' (' . date( 'T' ) . ')';
3705                 if ( isset( $wgLocaltimezone ) ) {
3706                         putenv( 'TZ='.$oldtz );
3707                 }
3708
3709                 # Variable replacement
3710                 # Because mOutputType is OT_WIKI, this will only process {{subst:xxx}} type tags
3711                 $text = $this->replaceVariables( $text );
3712
3713                 # Strip out <nowiki> etc. added via replaceVariables
3714                 $text = $this->strip( $text, $stripState, false, array( 'gallery' ) );
3715
3716                 # Signatures
3717                 $sigText = $this->getUserSig( $user );
3718                 $text = strtr( $text, array(
3719                         '~~~~~' => $d,
3720                         '~~~~' => "$sigText $d",
3721                         '~~~' => $sigText
3722                 ) );
3723
3724                 # Context links: [[|name]] and [[name (context)|]]
3725                 #
3726                 global $wgLegalTitleChars;
3727                 $tc = "[$wgLegalTitleChars]";
3728                 $nc = '[ _0-9A-Za-z\x80-\xff]'; # Namespaces can use non-ascii!
3729
3730                 $p1 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\))\\|]]/";            # [[ns:page (context)|]]
3731                 $p3 = "/\[\[(:?$nc+:|:|)($tc+?)( \\($tc+\\)|)(, $tc+|)\\|]]/";  # [[ns:page (context), context|]]
3732                 $p2 = "/\[\[\\|($tc+)]]/";                                      # [[|page]]
3733
3734                 # try $p1 first, to turn "[[A, B (C)|]]" into "[[A, B (C)|A, B]]"
3735                 $text = preg_replace( $p1, '[[\\1\\2\\3|\\2]]', $text );
3736                 $text = preg_replace( $p3, '[[\\1\\2\\3\\4|\\2]]', $text );
3737
3738                 $t = $this->mTitle->getText();
3739                 $m = array();
3740                 if ( preg_match( "/^($nc+:|)$tc+?( \\($tc+\\))$/", $t, $m ) ) {
3741                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3742                 } elseif ( preg_match( "/^($nc+:|)$tc+?(, $tc+|)$/", $t, $m ) && '' != "$m[1]$m[2]" ) {
3743                         $text = preg_replace( $p2, "[[$m[1]\\1$m[2]|\\1]]", $text );
3744                 } else {
3745                         # if there's no context, don't bother duplicating the title
3746                         $text = preg_replace( $p2, '[[\\1]]', $text );
3747                 }
3748
3749                 # Trim trailing whitespace
3750                 $text = rtrim( $text );
3751
3752                 return $text;
3753         }
3754
3755         /**
3756          * Fetch the user's signature text, if any, and normalize to
3757          * validated, ready-to-insert wikitext.
3758          *
3759          * @param User $user
3760          * @return string
3761          * @private
3762          */
3763         function getUserSig( &$user ) {
3764                 $username = $user->getName();
3765                 $nickname = $user->getOption( 'nickname' );
3766                 $nickname = $nickname === '' ? $username : $nickname;
3767
3768                 if( $user->getBoolOption( 'fancysig' ) !== false ) {
3769                         # Sig. might contain markup; validate this
3770                         if( $this->validateSig( $nickname ) !== false ) {
3771                                 # Validated; clean up (if needed) and return it
3772                                 return $this->cleanSig( $nickname, true );
3773                         } else {
3774                                 # Failed to validate; fall back to the default
3775                                 $nickname = $username;
3776                                 wfDebug( "Parser::getUserSig: $username has bad XML tags in signature.\n" );
3777                         }
3778                 }
3779
3780                 // Make sure nickname doesnt get a sig in a sig
3781                 $nickname = $this->cleanSigInSig( $nickname );
3782
3783                 # If we're still here, make it a link to the user page
3784                 $userpage = $user->getUserPage();
3785                 return( '[[' . $userpage->getPrefixedText() . '|' . wfEscapeWikiText( $nickname ) . ']]' );
3786         }
3787
3788         /**
3789          * Check that the user's signature contains no bad XML
3790          *
3791          * @param string $text
3792          * @return mixed An expanded string, or false if invalid.
3793          */
3794         function validateSig( $text ) {
3795                 return( wfIsWellFormedXmlFragment( $text ) ? $text : false );
3796         }
3797
3798         /**
3799          * Clean up signature text
3800          *
3801          * 1) Strip ~~~, ~~~~ and ~~~~~ out of signatures @see cleanSigInSig
3802          * 2) Substitute all transclusions
3803          *
3804          * @param string $text
3805          * @param $parsing Whether we're cleaning (preferences save) or parsing
3806          * @return string Signature text
3807          */
3808         function cleanSig( $text, $parsing = false ) {
3809                 global $wgTitle;
3810                 $this->startExternalParse( $wgTitle, new ParserOptions(), $parsing ? OT_WIKI : OT_MSG );
3811
3812                 $substWord = MagicWord::get( 'subst' );
3813                 $substRegex = '/\{\{(?!(?:' . $substWord->getBaseRegex() . '))/x' . $substWord->getRegexCase();
3814                 $substText = '{{' . $substWord->getSynonym( 0 );
3815
3816                 $text = preg_replace( $substRegex, $substText, $text );
3817                 $text = $this->cleanSigInSig( $text );
3818                 $text = $this->replaceVariables( $text );
3819
3820                 $this->clearState();
3821                 return $text;
3822         }
3823
3824         /**
3825          * Strip ~~~, ~~~~ and ~~~~~ out of signatures
3826          * @param string $text
3827          * @return string Signature text with /~{3,5}/ removed
3828          */
3829         function cleanSigInSig( $text ) {
3830                 $text = preg_replace( '/~{3,5}/', '', $text );
3831                 return $text;
3832         }
3833
3834         /**
3835          * Set up some variables which are usually set up in parse()
3836          * so that an external function can call some class members with confidence
3837          * @public
3838          */
3839         function startExternalParse( &$title, $options, $outputType, $clearState = true ) {
3840                 $this->mTitle =& $title;
3841                 $this->mOptions = $options;
3842                 $this->setOutputType( $outputType );
3843                 if ( $clearState ) {
3844                         $this->clearState();
3845                 }
3846         }
3847
3848         /**
3849          * Transform a MediaWiki message by replacing magic variables.
3850          *
3851          * @param string $text the text to transform
3852          * @param ParserOptions $options  options
3853          * @return string the text with variables substituted
3854          * @public
3855          */
3856         function transformMsg( $text, $options ) {
3857                 global $wgTitle;
3858                 static $executing = false;
3859
3860                 $fname = "Parser::transformMsg";
3861
3862                 # Guard against infinite recursion
3863                 if ( $executing ) {
3864                         return $text;
3865                 }
3866                 $executing = true;
3867
3868                 wfProfileIn($fname);
3869
3870                 if ( $wgTitle && !( $wgTitle instanceof FakeTitle ) ) {
3871                         $this->mTitle = $wgTitle;
3872                 } else {
3873                         $this->mTitle = Title::newFromText('msg');
3874                 }
3875                 $this->mOptions = $options;
3876                 $this->setOutputType( OT_MSG );
3877                 $this->clearState();
3878                 $text = $this->replaceVariables( $text );
3879
3880                 $executing = false;
3881                 wfProfileOut($fname);
3882                 return $text;
3883         }
3884
3885         /**
3886          * Create an HTML-style tag, e.g. <yourtag>special text</yourtag>
3887          * The callback should have the following form:
3888          *    function myParserHook( $text, $params, &$parser ) { ... }
3889          *
3890          * Transform and return $text. Use $parser for any required context, e.g. use
3891          * $parser->getTitle() and $parser->getOptions() not $wgTitle or $wgOut->mParserOptions
3892          *
3893          * @public
3894          *
3895          * @param mixed $tag The tag to use, e.g. 'hook' for <hook>
3896          * @param mixed $callback The callback function (and object) to use for the tag
3897          *
3898          * @return The old value of the mTagHooks array associated with the hook
3899          */
3900         function setHook( $tag, $callback ) {
3901                 $tag = strtolower( $tag );
3902                 $oldVal = isset( $this->mTagHooks[$tag] ) ? $this->mTagHooks[$tag] : null;
3903                 $this->mTagHooks[$tag] = $callback;
3904
3905                 return $oldVal;
3906         }
3907
3908         /**
3909          * Create a function, e.g. {{sum:1|2|3}}
3910          * The callback function should have the form:
3911          *    function myParserFunction( &$parser, $arg1, $arg2, $arg3 ) { ... }
3912          *
3913          * The callback may either return the text result of the function, or an array with the text
3914          * in element 0, and a number of flags in the other elements. The names of the flags are
3915          * specified in the keys. Valid flags are:
3916          *   found                     The text returned is valid, stop processing the template. This
3917          *                             is on by default.
3918          *   nowiki                    Wiki markup in the return value should be escaped
3919          *   noparse                   Unsafe HTML tags should not be stripped, etc.
3920          *   noargs                    Don't replace triple-brace arguments in the return value
3921          *   isHTML                    The returned text is HTML, armour it against wikitext transformation
3922          *
3923          * @public
3924          *
3925          * @param string $id The magic word ID
3926          * @param mixed $callback The callback function (and object) to use
3927          * @param integer $flags a combination of the following flags:
3928          *                SFH_NO_HASH No leading hash, i.e. {{plural:...}} instead of {{#if:...}}
3929          *
3930          * @return The old callback function for this name, if any
3931          */
3932         function setFunctionHook( $id, $callback, $flags = 0 ) {
3933                 $oldVal = isset( $this->mFunctionHooks[$id] ) ? $this->mFunctionHooks[$id] : null;
3934                 $this->mFunctionHooks[$id] = $callback;
3935
3936                 # Add to function cache
3937                 $mw = MagicWord::get( $id );
3938                 if( !$mw )
3939                         throw new MWException( 'Parser::setFunctionHook() expecting a magic word identifier.' );
3940
3941                 $synonyms = $mw->getSynonyms();
3942                 $sensitive = intval( $mw->isCaseSensitive() );
3943
3944                 foreach ( $synonyms as $syn ) {
3945                         # Case
3946                         if ( !$sensitive ) {
3947                                 $syn = strtolower( $syn );
3948                         }
3949                         # Add leading hash
3950                         if ( !( $flags & SFH_NO_HASH ) ) {
3951                                 $syn = '#' . $syn;
3952                         }
3953                         # Remove trailing colon
3954                         if ( substr( $syn, -1, 1 ) == ':' ) {
3955                                 $syn = substr( $syn, 0, -1 );
3956                         }
3957                         $this->mFunctionSynonyms[$sensitive][$syn] = $id;
3958                 }
3959                 return $oldVal;
3960         }
3961
3962         /**
3963          * Get all registered function hook identifiers
3964          *
3965          * @return array
3966          */
3967         function getFunctionHooks() {
3968                 return array_keys( $this->mFunctionHooks );
3969         }
3970
3971         /**
3972          * Replace <!--LINK--> link placeholders with actual links, in the buffer
3973          * Placeholders created in Skin::makeLinkObj()
3974          * Returns an array of links found, indexed by PDBK:
3975          *  0 - broken
3976          *  1 - normal link
3977          *  2 - stub
3978          * $options is a bit field, RLH_FOR_UPDATE to select for update
3979          */
3980         function replaceLinkHolders( &$text, $options = 0 ) {
3981                 global $wgUser;
3982                 global $wgContLang;
3983
3984                 $fname = 'Parser::replaceLinkHolders';
3985                 wfProfileIn( $fname );
3986
3987                 $pdbks = array();
3988                 $colours = array();
3989                 $sk = $this->mOptions->getSkin();
3990                 $linkCache =& LinkCache::singleton();
3991
3992                 if ( !empty( $this->mLinkHolders['namespaces'] ) ) {
3993                         wfProfileIn( $fname.'-check' );
3994                         $dbr = wfGetDB( DB_SLAVE );
3995                         $page = $dbr->tableName( 'page' );
3996                         $threshold = $wgUser->getOption('stubthreshold');
3997
3998                         # Sort by namespace
3999                         asort( $this->mLinkHolders['namespaces'] );
4000
4001                         # Generate query
4002                         $query = false;
4003                         $current = null;
4004                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4005                                 # Make title object
4006                                 $title = $this->mLinkHolders['titles'][$key];
4007
4008                                 # Skip invalid entries.
4009                                 # Result will be ugly, but prevents crash.
4010                                 if ( is_null( $title ) ) {
4011                                         continue;
4012                                 }
4013                                 $pdbk = $pdbks[$key] = $title->getPrefixedDBkey();
4014
4015                                 # Check if it's a static known link, e.g. interwiki
4016                                 if ( $title->isAlwaysKnown() ) {
4017                                         $colours[$pdbk] = 1;
4018                                 } elseif ( ( $id = $linkCache->getGoodLinkID( $pdbk ) ) != 0 ) {
4019                                         $colours[$pdbk] = 1;
4020                                         $this->mOutput->addLink( $title, $id );
4021                                 } elseif ( $linkCache->isBadLink( $pdbk ) ) {
4022                                         $colours[$pdbk] = 0;
4023                                 } else {
4024                                         # Not in the link cache, add it to the query
4025                                         if ( !isset( $current ) ) {
4026                                                 $current = $ns;
4027                                                 $query =  "SELECT page_id, page_namespace, page_title";
4028                                                 if ( $threshold > 0 ) {
4029                                                         $query .= ', page_len, page_is_redirect';
4030                                                 }
4031                                                 $query .= " FROM $page WHERE (page_namespace=$ns AND page_title IN(";
4032                                         } elseif ( $current != $ns ) {
4033                                                 $current = $ns;
4034                                                 $query .= ")) OR (page_namespace=$ns AND page_title IN(";
4035                                         } else {
4036                                                 $query .= ', ';
4037                                         }
4038
4039                                         $query .= $dbr->addQuotes( $this->mLinkHolders['dbkeys'][$key] );
4040                                 }
4041                         }
4042                         if ( $query ) {
4043                                 $query .= '))';
4044                                 if ( $options & RLH_FOR_UPDATE ) {
4045                                         $query .= ' FOR UPDATE';
4046                                 }
4047
4048                                 $res = $dbr->query( $query, $fname );
4049
4050                                 # Fetch data and form into an associative array
4051                                 # non-existent = broken
4052                                 # 1 = known
4053                                 # 2 = stub
4054                                 while ( $s = $dbr->fetchObject($res) ) {
4055                                         $title = Title::makeTitle( $s->page_namespace, $s->page_title );
4056                                         $pdbk = $title->getPrefixedDBkey();
4057                                         $linkCache->addGoodLinkObj( $s->page_id, $title );
4058                                         $this->mOutput->addLink( $title, $s->page_id );
4059
4060                                         if ( $threshold >  0 ) {
4061                                                 $size = $s->page_len;
4062                                                 if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4063                                                         $colours[$pdbk] = 1;
4064                                                 } else {
4065                                                         $colours[$pdbk] = 2;
4066                                                 }
4067                                         } else {
4068                                                 $colours[$pdbk] = 1;
4069                                         }
4070                                 }
4071                         }
4072                         wfProfileOut( $fname.'-check' );
4073
4074                         # Do a second query for different language variants of links and categories
4075                         if($wgContLang->hasVariants()){
4076                                 $linkBatch = new LinkBatch();
4077                                 $variantMap = array(); // maps $pdbkey_Variant => $keys (of link holders)
4078                                 $categoryMap = array(); // maps $category_variant => $category (dbkeys)
4079                                 $varCategories = array(); // category replacements oldDBkey => newDBkey
4080
4081                                 $categories = $this->mOutput->getCategoryLinks();
4082
4083                                 // Add variants of links to link batch
4084                                 foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4085                                         $title = $this->mLinkHolders['titles'][$key];
4086                                         if ( is_null( $title ) )
4087                                                 continue;
4088
4089                                         $pdbk = $title->getPrefixedDBkey();
4090                                         $titleText = $title->getText();
4091
4092                                         // generate all variants of the link title text
4093                                         $allTextVariants = $wgContLang->convertLinkToAllVariants($titleText);
4094
4095                                         // if link was not found (in first query), add all variants to query
4096                                         if ( !isset($colours[$pdbk]) ){
4097                                                 foreach($allTextVariants as $textVariant){
4098                                                         if($textVariant != $titleText){
4099                                                                 $variantTitle = Title::makeTitle( $ns, $textVariant );
4100                                                                 if(is_null($variantTitle)) continue;
4101                                                                 $linkBatch->addObj( $variantTitle );
4102                                                                 $variantMap[$variantTitle->getPrefixedDBkey()][] = $key;
4103                                                         }
4104                                                 }
4105                                         }
4106                                 }
4107
4108                                 // process categories, check if a category exists in some variant
4109                                 foreach( $categories as $category){
4110                                         $variants = $wgContLang->convertLinkToAllVariants($category);
4111                                         foreach($variants as $variant){
4112                                                 if($variant != $category){
4113                                                         $variantTitle = Title::newFromDBkey( Title::makeName(NS_CATEGORY,$variant) );
4114                                                         if(is_null($variantTitle)) continue;
4115                                                         $linkBatch->addObj( $variantTitle );
4116                                                         $categoryMap[$variant] = $category;
4117                                                 }
4118                                         }
4119                                 }
4120
4121
4122                                 if(!$linkBatch->isEmpty()){
4123                                         // construct query
4124                                         $titleClause = $linkBatch->constructSet('page', $dbr);
4125
4126                                         $variantQuery =  "SELECT page_id, page_namespace, page_title";
4127                                         if ( $threshold > 0 ) {
4128                                                 $variantQuery .= ', page_len, page_is_redirect';
4129                                         }
4130
4131                                         $variantQuery .= " FROM $page WHERE $titleClause";
4132                                         if ( $options & RLH_FOR_UPDATE ) {
4133                                                 $variantQuery .= ' FOR UPDATE';
4134                                         }
4135
4136                                         $varRes = $dbr->query( $variantQuery, $fname );
4137
4138                                         // for each found variants, figure out link holders and replace
4139                                         while ( $s = $dbr->fetchObject($varRes) ) {
4140
4141                                                 $variantTitle = Title::makeTitle( $s->page_namespace, $s->page_title );
4142                                                 $varPdbk = $variantTitle->getPrefixedDBkey();
4143                                                 $vardbk = $variantTitle->getDBkey();
4144
4145                                                 $holderKeys = array();
4146                                                 if(isset($variantMap[$varPdbk])){
4147                                                         $holderKeys = $variantMap[$varPdbk];
4148                                                         $linkCache->addGoodLinkObj( $s->page_id, $variantTitle );
4149                                                         $this->mOutput->addLink( $variantTitle, $s->page_id );
4150                                                 }
4151
4152                                                 // loop over link holders
4153                                                 foreach($holderKeys as $key){
4154                                                         $title = $this->mLinkHolders['titles'][$key];
4155                                                         if ( is_null( $title ) ) continue;
4156
4157                                                         $pdbk = $title->getPrefixedDBkey();
4158
4159                                                         if(!isset($colours[$pdbk])){
4160                                                                 // found link in some of the variants, replace the link holder data
4161                                                                 $this->mLinkHolders['titles'][$key] = $variantTitle;
4162                                                                 $this->mLinkHolders['dbkeys'][$key] = $variantTitle->getDBkey();
4163
4164                                                                 // set pdbk and colour
4165                                                                 $pdbks[$key] = $varPdbk;
4166                                                                 if ( $threshold >  0 ) {
4167                                                                         $size = $s->page_len;
4168                                                                         if ( $s->page_is_redirect || $s->page_namespace != 0 || $size >= $threshold ) {
4169                                                                                 $colours[$varPdbk] = 1;
4170                                                                         } else {
4171                                                                                 $colours[$varPdbk] = 2;
4172                                                                         }
4173                                                                 }
4174                                                                 else {
4175                                                                         $colours[$varPdbk] = 1;
4176                                                                 }
4177                                                         }
4178                                                 }
4179
4180                                                 // check if the object is a variant of a category
4181                                                 if(isset($categoryMap[$vardbk])){
4182                                                         $oldkey = $categoryMap[$vardbk];
4183                                                         if($oldkey != $vardbk)
4184                                                                 $varCategories[$oldkey]=$vardbk;
4185                                                 }
4186                                         }
4187
4188                                         // rebuild the categories in original order (if there are replacements)
4189                                         if(count($varCategories)>0){
4190                                                 $newCats = array();
4191                                                 $originalCats = $this->mOutput->getCategories();
4192                                                 foreach($originalCats as $cat => $sortkey){
4193                                                         // make the replacement
4194                                                         if( array_key_exists($cat,$varCategories) )
4195                                                                 $newCats[$varCategories[$cat]] = $sortkey;
4196                                                         else $newCats[$cat] = $sortkey;
4197                                                 }
4198                                                 $this->mOutput->setCategoryLinks($newCats);
4199                                         }
4200                                 }
4201                         }
4202
4203                         # Construct search and replace arrays
4204                         wfProfileIn( $fname.'-construct' );
4205                         $replacePairs = array();
4206                         foreach ( $this->mLinkHolders['namespaces'] as $key => $ns ) {
4207                                 $pdbk = $pdbks[$key];
4208                                 $searchkey = "<!--LINK $key-->";
4209                                 $title = $this->mLinkHolders['titles'][$key];
4210                                 if ( empty( $colours[$pdbk] ) ) {
4211                                         $linkCache->addBadLinkObj( $title );
4212                                         $colours[$pdbk] = 0;
4213                                         $this->mOutput->addLink( $title, 0 );
4214                                         $replacePairs[$searchkey] = $sk->makeBrokenLinkObj( $title,
4215                                                                         $this->mLinkHolders['texts'][$key],
4216                                                                         $this->mLinkHolders['queries'][$key] );
4217                                 } elseif ( $colours[$pdbk] == 1 ) {
4218                                         $replacePairs[$searchkey] = $sk->makeKnownLinkObj( $title,
4219                                                                         $this->mLinkHolders['texts'][$key],
4220                                                                         $this->mLinkHolders['queries'][$key] );
4221                                 } elseif ( $colours[$pdbk] == 2 ) {
4222                                         $replacePairs[$searchkey] = $sk->makeStubLinkObj( $title,
4223                                                                         $this->mLinkHolders['texts'][$key],
4224                                                                         $this->mLinkHolders['queries'][$key] );
4225                                 }
4226                         }
4227                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4228                         wfProfileOut( $fname.'-construct' );
4229
4230                         # Do the thing
4231                         wfProfileIn( $fname.'-replace' );
4232                         $text = preg_replace_callback(
4233                                 '/(<!--LINK .*?-->)/',
4234                                 $replacer->cb(),
4235                                 $text);
4236
4237                         wfProfileOut( $fname.'-replace' );
4238                 }
4239
4240                 # Now process interwiki link holders
4241                 # This is quite a bit simpler than internal links
4242                 if ( !empty( $this->mInterwikiLinkHolders['texts'] ) ) {
4243                         wfProfileIn( $fname.'-interwiki' );
4244                         # Make interwiki link HTML
4245                         $replacePairs = array();
4246                         foreach( $this->mInterwikiLinkHolders['texts'] as $key => $link ) {
4247                                 $title = $this->mInterwikiLinkHolders['titles'][$key];
4248                                 $replacePairs[$key] = $sk->makeLinkObj( $title, $link );
4249                         }
4250                         $replacer = new HashtableReplacer( $replacePairs, 1 );
4251
4252                         $text = preg_replace_callback(
4253                                 '/<!--IWLINK (.*?)-->/',
4254                                 $replacer->cb(),
4255                                 $text );
4256                         wfProfileOut( $fname.'-interwiki' );
4257                 }
4258
4259                 wfProfileOut( $fname );
4260                 return $colours;
4261         }
4262
4263         /**
4264          * Replace <!--LINK--> link placeholders with plain text of links
4265          * (not HTML-formatted).
4266          * @param string $text
4267          * @return string
4268          */
4269         function replaceLinkHoldersText( $text ) {
4270                 $fname = 'Parser::replaceLinkHoldersText';
4271                 wfProfileIn( $fname );
4272
4273                 $text = preg_replace_callback(
4274                         '/<!--(LINK|IWLINK) (.*?)-->/',
4275                         array( &$this, 'replaceLinkHoldersTextCallback' ),
4276                         $text );
4277
4278                 wfProfileOut( $fname );
4279                 return $text;
4280         }
4281
4282         /**
4283          * @param array $matches
4284          * @return string
4285          * @private
4286          */
4287         function replaceLinkHoldersTextCallback( $matches ) {
4288                 $type = $matches[1];
4289                 $key  = $matches[2];
4290                 if( $type == 'LINK' ) {
4291                         if( isset( $this->mLinkHolders['texts'][$key] ) ) {
4292                                 return $this->mLinkHolders['texts'][$key];
4293                         }
4294                 } elseif( $type == 'IWLINK' ) {
4295                         if( isset( $this->mInterwikiLinkHolders['texts'][$key] ) ) {
4296                                 return $this->mInterwikiLinkHolders['texts'][$key];
4297                         }
4298                 }
4299                 return $matches[0];
4300         }
4301
4302         /**
4303          * Tag hook handler for 'pre'.
4304          */
4305         function renderPreTag( $text, $attribs ) {
4306                 // Backwards-compatibility hack
4307                 $content = StringUtils::delimiterReplace( '<nowiki>', '</nowiki>', '$1', $text, 'i' );
4308
4309                 $attribs = Sanitizer::validateTagAttributes( $attribs, 'pre' );
4310                 return wfOpenElement( 'pre', $attribs ) .
4311                         Xml::escapeTagsOnly( $content ) .
4312                         '</pre>';
4313         }
4314
4315         /**
4316          * Renders an image gallery from a text with one line per image.
4317          * text labels may be given by using |-style alternative text. E.g.
4318          *   Image:one.jpg|The number "1"
4319          *   Image:tree.jpg|A tree
4320          * given as text will return the HTML of a gallery with two images,
4321          * labeled 'The number "1"' and
4322          * 'A tree'.
4323          */
4324         function renderImageGallery( $text, $params ) {
4325                 $ig = new ImageGallery();
4326                 $ig->setContextTitle( $this->mTitle );
4327                 $ig->setShowBytes( false );
4328                 $ig->setShowFilename( false );
4329                 $ig->setParsing();
4330                 $ig->useSkin( $this->mOptions->getSkin() );
4331
4332                 if( isset( $params['caption'] ) ) {
4333                         $caption = $params['caption'];
4334                         $caption = htmlspecialchars( $caption );
4335                         $caption = $this->replaceInternalLinks( $caption );
4336                         $ig->setCaptionHtml( $caption );
4337                 }
4338                 if( isset( $params['perrow'] ) ) {
4339                         $ig->setPerRow( $params['perrow'] );
4340                 }
4341                 if( isset( $params['widths'] ) ) {
4342                         $ig->setWidths( $params['widths'] );
4343                 }
4344                 if( isset( $params['heights'] ) ) {
4345                         $ig->setHeights( $params['heights'] );
4346                 }
4347
4348                 $lines = explode( "\n", $text );
4349                 foreach ( $lines as $line ) {
4350                         # match lines like these:
4351                         # Image:someimage.jpg|This is some image
4352                         $matches = array();
4353                         preg_match( "/^([^|]+)(\\|(.*))?$/", $line, $matches );
4354                         # Skip empty lines
4355                         if ( count( $matches ) == 0 ) {
4356                                 continue;
4357                         }
4358                         $tp = Title::newFromText( $matches[1] );
4359                         $nt =& $tp;
4360                         if( is_null( $nt ) ) {
4361                                 # Bogus title. Ignore these so we don't bomb out later.
4362                                 continue;
4363                         }
4364                         if ( isset( $matches[3] ) ) {
4365                                 $label = $matches[3];
4366                         } else {
4367                                 $label = '';
4368                         }
4369
4370                         $pout = $this->parse( $label,
4371                                 $this->mTitle,
4372                                 $this->mOptions,
4373                                 false, // Strip whitespace...?
4374                                 false  // Don't clear state!
4375                         );
4376                         $html = $pout->getText();
4377
4378                         $ig->add( new Image( $nt ), $html );
4379
4380                         # Only add real images (bug #5586)
4381                         if ( $nt->getNamespace() == NS_IMAGE ) {
4382                                 $this->mOutput->addImage( $nt->getDBkey() );
4383                         }
4384                 }
4385                 return $ig->toHTML();
4386         }
4387
4388         /**
4389          * Parse image options text and use it to make an image
4390          */
4391         function makeImage( $nt, $options ) {
4392                 # @TODO: let the MediaHandler specify its transform parameters
4393                 #
4394                 # Check if the options text is of the form "options|alt text"
4395                 # Options are:
4396                 #  * thumbnail          make a thumbnail with enlarge-icon and caption, alignment depends on lang
4397                 #  * left               no resizing, just left align. label is used for alt= only
4398                 #  * right              same, but right aligned
4399                 #  * none               same, but not aligned
4400                 #  * ___px              scale to ___ pixels width, no aligning. e.g. use in taxobox
4401                 #  * center             center the image
4402                 #  * framed             Keep original image size, no magnify-button.
4403                 # vertical-align values (no % or length right now):
4404                 #  * baseline
4405                 #  * sub
4406                 #  * super
4407                 #  * top
4408                 #  * text-top
4409                 #  * middle
4410                 #  * bottom
4411                 #  * text-bottom
4412
4413
4414                 $part = array_map( 'trim', explode( '|', $options) );
4415
4416                 $mwAlign = array();
4417                 $alignments = array( 'left', 'right', 'center', 'none', 'baseline', 'sub', 'super', 'top', 'text-top', 'middle', 'bottom', 'text-bottom' );
4418                 foreach ( $alignments as $alignment ) {
4419                         $mwAlign[$alignment] =& MagicWord::get( 'img_'.$alignment );
4420                 }
4421                 $mwThumb  =& MagicWord::get( 'img_thumbnail' );
4422                 $mwManualThumb =& MagicWord::get( 'img_manualthumb' );
4423                 $mwWidth  =& MagicWord::get( 'img_width' );
4424                 $mwFramed =& MagicWord::get( 'img_framed' );
4425                 $mwPage   =& MagicWord::get( 'img_page' );
4426                 $caption = '';
4427
4428                 $params = array();
4429                 $framed = $thumb = false;
4430                 $manual_thumb = '' ;
4431                 $align = $valign = '';
4432                 $sk = $this->mOptions->getSkin();
4433
4434                 foreach( $part as $val ) {
4435                         if ( !is_null( $mwThumb->matchVariableStartToEnd($val) ) ) {
4436                                 $thumb=true;
4437                         } elseif ( ! is_null( $match = $mwManualThumb->matchVariableStartToEnd($val) ) ) {
4438                                 # use manually specified thumbnail
4439                                 $thumb=true;
4440                                 $manual_thumb = $match;
4441                         } else {
4442                                 foreach( $alignments as $alignment ) {
4443                                         if ( ! is_null( $mwAlign[$alignment]->matchVariableStartToEnd($val) ) ) {
4444                                                 switch ( $alignment ) {
4445                                                         case 'left': case 'right': case 'center': case 'none':
4446                                                                 $align = $alignment; break;
4447                                                         default:
4448                                                                 $valign = $alignment;
4449                                                 }
4450                                                 continue 2;
4451                                         }
4452                                 }
4453                                 if ( ! is_null( $match = $mwPage->matchVariableStartToEnd($val) ) ) {
4454                                         # Select a page in a multipage document
4455                                         $params['page'] = $match;
4456                                 } elseif ( !isset( $params['width'] ) && ! is_null( $match = $mwWidth->matchVariableStartToEnd($val) ) ) {
4457                                         wfDebug( "img_width match: $match\n" );
4458                                         # $match is the image width in pixels
4459                                         $m = array();
4460                                         if ( preg_match( '/^([0-9]*)x([0-9]*)$/', $match, $m ) ) {
4461                                                  $params['width'] = intval( $m[1] );
4462                                                  $params['height'] = intval( $m[2] );
4463                                         } else {
4464                                                 $params['width'] = intval($match);
4465                                         }
4466                                 } elseif ( ! is_null( $mwFramed->matchVariableStartToEnd($val) ) ) {
4467                                         $framed=true;
4468                                 } else {
4469                                         $caption = $val;
4470                                 }
4471                         }
4472                 }
4473                 # Strip bad stuff out of the alt text
4474                 $alt = $this->replaceLinkHoldersText( $caption );
4475
4476                 # make sure there are no placeholders in thumbnail attributes
4477                 # that are later expanded to html- so expand them now and
4478                 # remove the tags
4479                 $alt = $this->mStripState->unstripBoth( $alt );
4480                 $alt = Sanitizer::stripAllTags( $alt );
4481
4482                 # Linker does the rest
4483                 return $sk->makeImageLinkObj( $nt, $caption, $alt, $align, $params, $framed, $thumb, $manual_thumb, $valign );
4484         }
4485
4486         /**
4487          * Set a flag in the output object indicating that the content is dynamic and
4488          * shouldn't be cached.
4489          */
4490         function disableCache() {
4491                 wfDebug( "Parser output marked as uncacheable.\n" );
4492                 $this->mOutput->mCacheTime = -1;
4493         }
4494
4495         /**#@+
4496          * Callback from the Sanitizer for expanding items found in HTML attribute
4497          * values, so they can be safely tested and escaped.
4498          * @param string $text
4499          * @param array $args
4500          * @return string
4501          * @private
4502          */
4503         function attributeStripCallback( &$text, $args ) {
4504                 $text = $this->replaceVariables( $text, $args );
4505                 $text = $this->mStripState->unstripBoth( $text );
4506                 return $text;
4507         }
4508
4509         /**#@-*/
4510
4511         /**#@+
4512          * Accessor/mutator
4513          */
4514         function Title( $x = NULL ) { return wfSetVar( $this->mTitle, $x ); }
4515         function Options( $x = NULL ) { return wfSetVar( $this->mOptions, $x ); }
4516         function OutputType( $x = NULL ) { return wfSetVar( $this->mOutputType, $x ); }
4517         /**#@-*/
4518
4519         /**#@+
4520          * Accessor
4521          */
4522         function getTags() { return array_keys( $this->mTagHooks ); }
4523         /**#@-*/
4524
4525
4526         /**
4527          * Break wikitext input into sections, and either pull or replace
4528          * some particular section's text.
4529          *
4530          * External callers should use the getSection and replaceSection methods.
4531          *
4532          * @param $text Page wikitext
4533          * @param $section Numbered section. 0 pulls the text before the first
4534          *                 heading; other numbers will pull the given section
4535          *                 along with its lower-level subsections.
4536          * @param $mode One of "get" or "replace"
4537          * @param $newtext Replacement text for section data.
4538          * @return string for "get", the extracted section text.
4539          *                for "replace", the whole page with the section replaced.
4540          */
4541         private function extractSections( $text, $section, $mode, $newtext='' ) {
4542                 # strip NOWIKI etc. to avoid confusion (true-parameter causes HTML
4543                 # comments to be stripped as well)
4544                 $stripState = new StripState;
4545
4546                 $oldOutputType = $this->mOutputType;
4547                 $oldOptions = $this->mOptions;
4548                 $this->mOptions = new ParserOptions();
4549                 $this->setOutputType( OT_WIKI );
4550
4551                 $striptext = $this->strip( $text, $stripState, true );
4552
4553                 $this->setOutputType( $oldOutputType );
4554                 $this->mOptions = $oldOptions;
4555
4556                 # now that we can be sure that no pseudo-sections are in the source,
4557                 # split it up by section
4558                 $uniq = preg_quote( $this->uniqPrefix(), '/' );
4559                 $comment = "(?:$uniq-!--.*?QINU)";
4560                 $secs = preg_split(
4561                         "/
4562                         (
4563                                 ^
4564                                 (?:$comment|<\/?noinclude>)* # Initial comments will be stripped
4565                                 (=+) # Should this be limited to 6?
4566                                 .+?  # Section title...
4567                                 \\2  # Ending = count must match start
4568                                 (?:$comment|<\/?noinclude>|[ \\t]+)* # Trailing whitespace ok
4569                                 $
4570                         |
4571                                 <h([1-6])\b.*?>
4572                                 .*?
4573                                 <\/h\\3\s*>
4574                         )
4575                         /mix",
4576                         $striptext, -1,
4577                         PREG_SPLIT_DELIM_CAPTURE);
4578
4579                 if( $mode == "get" ) {
4580                         if( $section == 0 ) {
4581                                 // "Section 0" returns the content before any other section.
4582                                 $rv = $secs[0];
4583                         } else {
4584                                 //track missing section, will replace if found.
4585                                 $rv = $newtext;
4586                         }
4587                 } elseif( $mode == "replace" ) {
4588                         if( $section == 0 ) {
4589                                 $rv = $newtext . "\n\n";
4590                                 $remainder = true;
4591                         } else {
4592                                 $rv = $secs[0];
4593                                 $remainder = false;
4594                         }
4595                 }
4596                 $count = 0;
4597                 $sectionLevel = 0;
4598                 for( $index = 1; $index < count( $secs ); ) {
4599                         $headerLine = $secs[$index++];
4600                         if( $secs[$index] ) {
4601                                 // A wiki header
4602                                 $headerLevel = strlen( $secs[$index++] );
4603                         } else {
4604                                 // An HTML header
4605                                 $index++;
4606                                 $headerLevel = intval( $secs[$index++] );
4607                         }
4608                         $content = $secs[$index++];
4609
4610                         $count++;
4611                         if( $mode == "get" ) {
4612                                 if( $count == $section ) {
4613                                         $rv = $headerLine . $content;
4614                                         $sectionLevel = $headerLevel;
4615                                 } elseif( $count > $section ) {
4616                                         if( $sectionLevel && $headerLevel > $sectionLevel ) {
4617                                                 $rv .= $headerLine . $content;
4618                                         } else {
4619                                                 // Broke out to a higher-level section
4620                                                 break;
4621                                         }
4622                                 }
4623                         } elseif( $mode == "replace" ) {
4624                                 if( $count < $section ) {
4625                                         $rv .= $headerLine . $content;
4626                                 } elseif( $count == $section ) {
4627                                         $rv .= $newtext . "\n\n";
4628                                         $sectionLevel = $headerLevel;
4629                                 } elseif( $count > $section ) {
4630                                         if( $headerLevel <= $sectionLevel ) {
4631                                                 // Passed the section's sub-parts.
4632                                                 $remainder = true;
4633                                         }
4634                                         if( $remainder ) {
4635                                                 $rv .= $headerLine . $content;
4636                                         }
4637                                 }
4638                         }
4639                 }
4640                 if (is_string($rv))
4641                         # reinsert stripped tags
4642                         $rv = trim( $stripState->unstripBoth( $rv ) );
4643
4644                 return $rv;
4645         }
4646
4647         /**
4648          * This function returns the text of a section, specified by a number ($section).
4649          * A section is text under a heading like == Heading == or \<h1\>Heading\</h1\>, or
4650          * the first section before any such heading (section 0).
4651          *
4652          * If a section contains subsections, these are also returned.
4653          *
4654          * @param $text String: text to look in
4655          * @param $section Integer: section number
4656          * @param $deftext: default to return if section is not found
4657          * @return string text of the requested section
4658          */
4659         public function getSection( $text, $section, $deftext='' ) {
4660                 return $this->extractSections( $text, $section, "get", $deftext );
4661         }
4662
4663         public function replaceSection( $oldtext, $section, $text ) {
4664                 return $this->extractSections( $oldtext, $section, "replace", $text );
4665         }
4666
4667         /**
4668          * Get the timestamp associated with the current revision, adjusted for
4669          * the default server-local timestamp
4670          */
4671         function getRevisionTimestamp() {
4672                 if ( is_null( $this->mRevisionTimestamp ) ) {
4673                         wfProfileIn( __METHOD__ );
4674                         global $wgContLang;
4675                         $dbr = wfGetDB( DB_SLAVE );
4676                         $timestamp = $dbr->selectField( 'revision', 'rev_timestamp',
4677                                         array( 'rev_id' => $this->mRevisionId ), __METHOD__ );
4678
4679                         // Normalize timestamp to internal MW format for timezone processing.
4680                         // This has the added side-effect of replacing a null value with
4681                         // the current time, which gives us more sensible behavior for
4682                         // previews.
4683                         $timestamp = wfTimestamp( TS_MW, $timestamp );
4684
4685                         // The cryptic '' timezone parameter tells to use the site-default
4686                         // timezone offset instead of the user settings.
4687                         //
4688                         // Since this value will be saved into the parser cache, served
4689                         // to other users, and potentially even used inside links and such,
4690                         // it needs to be consistent for all visitors.
4691                         $this->mRevisionTimestamp = $wgContLang->userAdjust( $timestamp, '' );
4692
4693                         wfProfileOut( __METHOD__ );
4694                 }
4695                 return $this->mRevisionTimestamp;
4696         }
4697
4698         /**
4699          * Mutator for $mDefaultSort
4700          *
4701          * @param $sort New value
4702          */
4703         public function setDefaultSort( $sort ) {
4704                 $this->mDefaultSort = $sort;
4705         }
4706
4707         /**
4708          * Accessor for $mDefaultSort
4709          * Will use the title/prefixed title if none is set
4710          *
4711          * @return string
4712          */
4713         public function getDefaultSort() {
4714                 if( $this->mDefaultSort !== false ) {
4715                         return $this->mDefaultSort;
4716                 } else {
4717                         return $this->mTitle->getNamespace() == NS_CATEGORY
4718                                         ? $this->mTitle->getText()
4719                                         : $this->mTitle->getPrefixedText();
4720                 }
4721         }
4722
4723 }
4724
4725 /**
4726  * @todo document, briefly.
4727  * @addtogroup Parser
4728  */
4729 class OnlyIncludeReplacer {
4730         var $output = '';
4731
4732         function replace( $matches ) {
4733                 if ( substr( $matches[1], -1 ) == "\n" ) {
4734                         $this->output .= substr( $matches[1], 0, -1 );
4735                 } else {
4736                         $this->output .= $matches[1];
4737                 }
4738         }
4739 }
4740
4741 /**
4742  * @todo document, briefly.
4743  * @addtogroup Parser
4744  */
4745 class StripState {
4746         var $general, $nowiki;
4747
4748         function __construct() {
4749                 $this->general = new ReplacementArray;
4750                 $this->nowiki = new ReplacementArray;
4751         }
4752
4753         function unstripGeneral( $text ) {
4754                 wfProfileIn( __METHOD__ );
4755                 $text = $this->general->replace( $text );
4756                 wfProfileOut( __METHOD__ );
4757                 return $text;
4758         }
4759
4760         function unstripNoWiki( $text ) {
4761                 wfProfileIn( __METHOD__ );
4762                 $text = $this->nowiki->replace( $text );
4763                 wfProfileOut( __METHOD__ );
4764                 return $text;
4765         }
4766
4767         function unstripBoth( $text ) {
4768                 wfProfileIn( __METHOD__ );
4769                 $text = $this->general->replace( $text );
4770                 $text = $this->nowiki->replace( $text );
4771                 wfProfileOut( __METHOD__ );
4772                 return $text;
4773         }
4774 }
4775
4776 ?>